Scientific Bulletin Series C, Volume XXI (2007)
EXPERIMENTAL RESEARCH REGARDING THE HD RADIAL BEARINGS IN THE CASE OF STATIC CHALLENGING WORKING
Marius Alexandrescu, Eugen Pay, Radu Cotetiu, Mihai Tiron
Abstract: In the static charge, the scope of our experiments was to determinate the influence of the peripheric speed, of the start flow, of the pressure on the placement of the pressure, and we observe the dimension of the contact spot and the position of the maximal pressure.
Keywords: pressure distribution, radial hydrodynamic bearing, the lubricant film geometry.
OVERALL EQUIPMENT EFFECTIVENESS ASSESSMENT OF THE OPEN PIT COAL MINING PRODUCTION SYSTEM
ANDRAS, IOSIF, NAN, MARIN SILVIU KOVACS, IOSIF CRISTEA, DUMITRU TOMESCU LIVIU CRISTIAN
Abstract: Using simulation for materializing the metrics of OEE in case of open pit lignite mines
production systems considering the reliability, availability and performance in order to assess and predict the overall production capacity of a continuous complex production system is done for the first time in Romania. Defining the instantaneous production rate as a combination of fluctuant random variable and a binary probability state function, the recorded data considering the duration of repairs and the cadence of breakdowns, in the frame of an informatic system, and using Monte Carlo simulation are new approach in the study of such systems, and translation of the concept of OEE in the continuous mining systems behavior are fruitful for the formulation of practical recommendations.
Keywords: mining, lignite, excavator, reliability, availability, uptime, downtime.
INCREASING THE PRODUCTS QUALITY USING PROGRESSIVE KNOWLEDGE IN THE FIELD OF CONSTRUCTION
Doc. Ing. Vojtech Anna, PhD., Ing. Erika Kačírová
Abstract: The increasing of machine quality requires constructor to use the progressive knowledge to design as well as observing the instructions, regulations, directives and standards.
The producer, ISO 9001 Certificate owner is the only one who is possible to achieve the high quality of machine or the producer, who meets criteria following the ISO 9001 standard, that means quality system, model of quality provision in designing and development processing, plant implementation and service. More and more, up-to-date knowledge gains ground: using 2D CAD but mostly 3D CAD systems will guarantee the high quality of the products.
Keywords: construction, designing, quality, Combinator.
ESTABLISHMENT OF A DATA PROCESSING SYSTEM FOR FREEZE DRIER
Tamás Antal, Benedek Kerekes
Abstract: The laboratory equipments are important in elaboration of technologies in freeze drying, for research of the product quality, amelioration, moreover determination of transport properties. Our department has a laboratory vacuum freeze drying equipment (Armfield FT 33). We can register all the data during the procedure.
It’s important to analyze this freeze drying procedure, because this is elementary for system designing. We have constructed the necessary measuring instruments, their arrangement.
The automatization of this process isn’t a simple problem. The principal measured characteristics are: mass of dried product, temperature of dried product layer, temperature of the heater, vacuum, freezing temperature. We can measure the dried product’s weight by a load cell, with the necessary accuracy.
Keywords: freeze drying, tomato, data processing system, heat and mass transfer, chemical composition, rehydration ratio.
BUSINESS PROCESS MANAGEMENT SOFTWARE IN THE FIELD OF SERVICE ENGINEERING
Helmut, Aschbacher; Stefan, Grünwald; Ernst, Kreuzer
Abstract: Service Engineering is an effective and proper method in creating business services. Due to the fact of the use of strongly marketing influenced methods during the process of the creation of a new service the results of the service model are ineffectively to monitor in their process costs and in their process efficiently. BPM is a possible approach in improving the service engineering process in selected phases.
Keywords: Service Engineering, Business process management, SOA.
DESIGN OF INFORMATION SYSTEM FOR FMEA METHOD REALIZATION
Petr BARON, Peter BRÁZDA
Abstract: Paper describes information system proposition for realization of FMEA risk valuation and possibility of its implementation at proposed technical devices error identification and realization of corrective steps in structural, technological changes and series of experimental operations.
Keywords: FMEA, risk valuation, risk score, no-failure operation.
INFORMATICAL INVESTMENTS OF SAPARD AND AVOP PRO-GRAMMES
Olga, Berta – Miklós, Szabó
Abstract: One of the pre-joining aid programmes was the SAPARD Programme, which is successful all things considered. Our country started to establish the necessary institutional background for the competitions in 2000, and the first competitions were announced in 2002. The competition-system of SAPARD was very different from the other national agricultural aiding systems, which had been known widely before. The most important aim of SAPARD Programme was to make others to get know the competition-system after joining the EU, of course, together with closing u pof the national agriculture. Farmers and enterprises, which were worked with competitions, could accept the first obstacles easily, however, the announced competition-system was very difficult and there were several problems for lack of information. The AVOP was a known competition-form after the joining of the EU, so giving of the competition was easy, however, number of the inquiring people for the competition grew considerably. According to the newest datas, more than 11.000 competitions were given between 2004 and 2 April 2007. Success of the competition-system can open other perspectives for the agricultural enterprises, in so far as, there will be more opportunities to contact with informatical competitions inside of the agricultural section.
Keywords: SAPARD, AVOP, informatical competitions, agricultural section.
STUDY OF GRINDING WHEELS UNDER CRITICAL SPEED
Ondřej Bílek, TU Brno; Imrich Lukovics, TBU Zlin
Abstract: Intensification of grinding process is recently provided by increase of cutting speed. The article describes possibilities of shaping of grinding wheels in other to get constant strength wheel. This paper also relates physical-mechanical properties of grinding wheels and presents experimental equipment. Some experimental results of using new shape grinding wheels with respect to high speeds are presented. Influence of high speed on stock removal and change of surface roughness is discussed.
Keywords: Grinding, Wheels, Critical speed, Study.
FINITE ELEMENT METHOD A SOLUTION FOR THE PLANETARY GEARS TO IMPROVE THE QUALITY MATRIX
GRATIELA DANA BOCA , PETER DIETZ , TIM SCHWARZER
Abstract: Finite Element Method give by virtual simulation the answer to different situation which can be find in practice.Not at last this theoretical model can be a important tool for the design machine and for a better improvement of quality. Also to discover and prevent the wear gear, or to use the low noise design of machine and implemented in this way a higher quality.
Keywords: quality matrix, quality wear.
LEGISLATIVE ASPECTS CONCERNING ECODESIGN
Codruţa BOLOS, Crenguţa LEAUA
Abstract: The paper presents the modern definition of the notion of ecodesign as well as the current international, European and national approach of ecodesign.
Keywords: ecodesign, legislation.
HOBBING OF THE PLANE SPIROID WHEELS WITH THE FLY CUTTER
Vasile BOLOS, Codruţa BOLOS
Abstract: The paper emphasises kinematics of hobbing trough the milling procedure with fly cutter of plane spiroid wheels on the hobbing machine FD500.
Keywords: Spiroid gearing, Hobbing, Fly cutter, Kinematic.
IMPLEMENTATION OF A HIGH RESOLUTION VELOCITY SENSOR USING A QUADRATURE SHAFT ENCODER FOR ACTUATORS
BUCHMAN Attila, NASUI Vasile, UNGUREANU Miorita, ALEXANDRESCU Marius
Abstract: This paper presents a straightforward way to decode a quadrature shaft encoder output in order to obtain an accurate estimate of velocity linear actuators. The resolution of the implemented velocity sensor wil be theoretically estimated and experimentally measure. A digital signal processing method to overcome the inherent error of the method at low speed will be discussed.
Keywords: actuator, shaft encoder, quadrature, resolution, full scale range, slew rate.
ABOUT FLANK SURFACE QUALITY IN HIGH PRECISION PUNCHING OF TOOTHED GEARS
Lucian BUTNAR , Mihai BANICA
Abstract: The high precision punching is a modern procedure in order to obtain high quality cylindrical gears. During the process, the prominent plastic deformation and the superior tensions produce a flank surface with low roughness. The smooth zone proportion from the processed surface is bigger in high precision punching (about 80-90%) than in ordinary punching (about 30-40%). If the influence factors – quality: material, thickness, clearance and friction – have optimal values, and the proceeding technology is correct, the flank roughness arrived to Ra = 0.2…0.4 μm and the toothed gear has a precision in IT 6 – 8 ISO.
Keywords: high precision punching, influence factors, flank surface.
FINITE ELEMENT SIMULATION OF TUBES PRESS BENDING PROCESS
Vasile Adrian Ceclan ; Gheorghe Achimaş, Lucian Lăzărescu, Florica Mioara Groze
Abstract: In this paper is presented a finite element model for simulation of tubes Press Bending Process. The finite element model, used commercial code ABAQUS. Also in this paper is present some results for simulation of different angle of the bending. Cold bending of metal tubes is very important production method considering that metal tubes are widely used in a great variety of engineering products, such as automobile, aircraft, air conditioner, air compressor, exhaust systems, fluid lines.
Keywords: -.
A DESIGN METHOD FOR THE TRANSMISSIONS WITH ASYMMETRICAL SPUR GEARS
Flavia Chira, Mihai Bănică
Abstract: The paper presents a design method for spur gears with asymmetrical involute teeth. The initial phase, which is necessary for the study of these special gears, is the elaboration of a design programme for the asymmetrical gearing and for the asimetrical gear rack. These fact,makes possible the calculatation of the geometrical parameters for a great number of gearings, with the same initial data but with different design variant, which can be chosen by the designing engineer user of the program. The simulation and the determination of gearing performances, based on the calculated parameters, ensure the informations which one can establish the optimal variant.
Keywords: Direct gear design, spur gears, asymmetrical involute teeth, asymmetric gear rack.
STRUCTURAL CONFIGURATION METHODS FOR MACHINE TOOLS
George Constantin, Adrian Ghionea, Miron Zapciu
Abstract: The papers deals with description of a generating method for structural configuration of machining centers, considering in detail a vertical machining center with three axes. Starting from a structural configuration of an existing machining center the basic structural configuration is established. A tree-graph corresponding to this structure is generated. It consists of a sequence of structure elements connected by joints (R-revolution, P- prismatic). By combining the elements and joints one can obtain all possible variants of configurations. Applying some criteria the optimum variant of structural configuration is obtained.
Keywords: machining center, automatic tool changer, structural configuration synthesis, graph representation, motion axis.
HORIZONTAL PATH STRATEGY FOR 3D-CAD ANALYSIS OF CHIP AREA IN 3-AXES BALL NOSE END MILLING
Marius Cosma
Abstract: This paper investigates and evaluates the chip area in horizontal path strategy (upward and downward) in ball nose end milling, for different workpiece inclination angle, using 3D-CAD software. A minimum workpiece inclination angle to avoid cutting at the tip of the cutter is defined such the angle between cutter axis and surface normal. The result of analysis between the chip area and the inclination angle has been shown in graphics, for one cutting edge rotation. The cutting force on the tool edge is in proportion with the chip area and using this study, can be predicted the inclination angle and direction of milling to improve the cutting performance.
Keywords: 3D-CAD, Chip Area, Ball Nose End Milling, Horizontal Upward, Horizontal Downward.
AGENT BASED APPLICATIONS IN DISTRIBUTED SYSTEMS
Cristinel Costea, Cezar Toader, Adrian Petrovan
Abstract: The common models of control systems are based on predictable events and use deterministic algorithms; however the systems act in uncertain and complex environments and have to be able to rapidly respond to changing conditions by optimizing multiple constraints . This paper presents some of the researches done in the distributed and cooperative systems: agent-based architecture approaches to the development of distributed applications.
Keywords: Distributed Computing, Distributed Artificial Intelligence, Multi-Agent Systems.
CONSIDERATIONS ON STRESS AND ITS CONSEQUENCES, REGARDING THE COMMUNICATION PROCESS
Adriana COTETIU, Rita TOADER
Abstract: Communication is a process of transmitting information, under the form of symbolic messages, between two or more people, some with broadcaster status, and others with receiver status, by means of some specific channels. In the communication process context there appear some perturbation factors, which manifest on the broadcaster – receiver route and which may cause major disfunctionalities. Stress represents the conjunction state resulted from the action of the stressful agent and the adaptation capacity of the organism. To have an efficient managerial communication we must diminish and eliminate the causes that generate stress both at the managers’ level, as broadcasters, and at the subordinates’ level, as receivers.
Keywords: stress, communication process.
THE INFLUENCE OF THE GEOMETRICAL PARAMETERS IN THE WORM-GEARS WITH ROLLING ELEMENTS EFFICIENCY
Radu COTETIU, Adriana COTETIU, Marius ALEXANDRESCU
Abstract: Taking in account the lower values of classical worm-gears efficiency, the studies of the worm-gears with rolling elements is important. The paper presents theoretical and experimental results regard the values of efficiency in various function conditions and the influence of geometrical parameters variation.
Keywords: worm-gears, efficiency, rolling.
THE GEOMETRICAL PARAMETERS OF THE HUMAN INTERVERTEBRAL DISC MEASURED USING CT AND AUTOCAD
Monica-Iliuta Creţan, Mihai Gafitanu, Florin Munteanu
Abstract: It is classically taught that the lumbar spine is designed to provide axial rigidity to the lower trunk, to sustain axial compression loads exerted from the trunk and upper limbs and to permit movements between the trunk and pelvis. The intervertebral disc is responsible for transmission and stabilizing a combination of compressive, torsion and bending forces subjected to the trunk of the body. During the degenerative process, changes occur in the nucleus and annulus. A current surgical treatment for degenerative spinal problems is the total disc replacement with intervertebral disc prosthesis. The device must maintain the proper intervertebral spacing, allow for motion, and provide stability. The intervertebral disc prosthesis ideally would replicate normal range of motion in all plane and must reproduce physiologic stiffness in all planes of motion plus axial compression. The objective of this study is to develop an improved automated method that will measure the geometrical parameters of intervertebral disc and in the human lumbar spine from CT scan and with AUTOCAD.
Keywords: spine, intervertebral, disc, prosthesis, parameters.
OPTIMIZATION POSSIBILITIES IN CAD/CAM SYSTEMS
Nadežda Čuboňová, Miroslav Michalco
Abstract: Process optimization is a necessary condition for good process solution of technology in CAD/CAM system. For example optimization appear from workpiece, which is gradually actualized, in consequence the next roughing operation is machining workpiece only there, where it is really necessary – elimination of ineffective moves and operations. Another optimization is optimization regarding to shape, proportions of tool and fixture or spindle, where the system is optimizing machining strategy regarding to undercutting or collision of above mentioned system with machined surface.
Keywords: -.
TOOTH FRICTION LOSS IN SIMPLE PLANETARY GEARS
Attila Csobán
Abstract: The efficiency of planetary gears mainly depends on the tooth friction loss. In order to analyze the possibilities to reach the highest efficiency it is necessary to calculate the tooth friction loss. There are some methods for calculation of the tooth friction published in literature, which can be used for the analysis. Using a method developed by Duda to calculate the efficiency of tooth gears and another method suggested by Bartz to calculate the average coefficient of friction between the mating teeth we executed detailed investigation of the parameters influencing the tooth friction loss. Calculations were performed to determine the efficiency of simple planetary gears, evaluating the influence of the tooth profile on the tooth friction loss at different gear ratios. The geometries of tooth profile were changed with different modules and different addendum modifications of the gears.
Keywords: Planetary gear, tooth efficiency, addendum modification, tooth friction loss, tooth geometry.
IMPROVED SHAPE OF THE TOOTH FOR BUCKET WHEEL EXCAVATOR FOR THE CONDITION OF ROMANIAN OPEN PITS
DAFINOIU MIHAIL, TOMUŞ OVIDIU-BOGDAN, DINESCU STELA, STĂNILĂ SORINA DANIELA, ANDRAŞ ANDREI
Abstract: The paper deals with the aspects related to conceiving and realizing a tooth for bucket wheel excavators devoted to be used in Romanian open pits for excavating the overburden rocks, based on the results of cutting process experimental and theoretical research.
Keywords: excavator, teeth, shape, lignite, open pit.
REMANUFACTURING – OPPORTUNITIES AND BARRIERS
Dinu Darabă
Abstract: The remanufacturing represents the totality of the technological processes, through which a technological equipment, that has been in a certain state of physical and/or moral wear or definitively inoperable, goes through a transformation process into a new technological equipment, with the same usefulness or a different one, reusing under different ways as many parts of the old equipment as it is possible.
Because the durable goods represent a major investment for many of the organizations, the remanufacturing is a good opportunity for the decreasing of their purchasing costs. Thus, the purchasing of the remanufactured goods represents an important component of the effort of increasing the profit.
Keywords: Remanufacturing, Opportunities, Barriers, Technologic Equipment, Uncertainty.
THE GEARING LINE’ LIMITS OF THE CYCLOID GEAR WITH ROLLER TEETH
Dăscălescu Anamaria
Abstract: From dynamic point of view, at the cycloid gear transmission is not rational to utilize the entire length of the cycloid profile of the satellite gear. The favorable interval of the cycloid profile of a tooth is limited by the tooth addendum’ circle with ra radius and the tooth dedendum’ circle with rf radius. The dynamic favorable interval represent ≈45% from entire cycloid profile length of a satelite gear tooth.
Keywords: gearing line, pressure angle, reaction values.
EXAMINATION OF FAMILY FARMS AND MACHINERY RING OPERATION IN ENGLAND
Gábor Dávidházy, László Deák
Abstract: According to the original aim of our examinations with studying family farms include:
- arable land plant production farms,
- milking cow farms,
- mixed – arable land plant, fodder producing and animal husbandry – profile farms.
To our great pleasure by winning a significant grant, complying with the three profile in site farm examinations
were extended to Great Britain which meant the inclusion of Scottish, Wales and Northern Ireland Farms, too.
Beyond the in site farm examinations in our Britain research the - “CONTRACTOR” entrepreneurs and the
- “MACHINERY RING” machine centers were in focus.
Keywords: Family Farms, Machinery Rings, Contracting, Contractors.
THE INFLUENCE OF MANUFACTURING QUALITY UPON GEARS–TRANSMISSION USING LOW NOISE DESIGN
DIETZ Peter, BOCA Gratiela Dana
Abstract: The acoustic behavior of technical products is predominantly defined in the design stage, although the acoustic characteristics of machine structures can be analyze and give a solution for the actual products and create a new generation of products.
The paper describe the development of the noise generation by coupling the mechanical structures with the physical noise generation mechanism.
Keywords: low design products, low noise product, techniques design education.
OBSERVATION OF PRODUCTION PROCESS CAPACITY BY INJECTION MOULDING
Dobránsky Jozef
Abstract: Paper deals with observation of production process capacity by injection moulding. According to measuring values and by software we can determine this capacity. Samples made on injection moulding machine. Next this samples was measured and values was input into the software for determination of production process capacity.
Keywords: injection moulding, plastic, capacity, weight.
DETERMINATIONS OF THE POLLUTION LEVEL OF THE ENVIRONMENT WITH HEAVY METALS
Mariana Dobra, Vasile Viman, Gheorghe Vâtcă
Abstract: The determination of the pollution level of the environment with heavy metals implies the determination of the metals’ concentrations in several samples as much from the point of view of the sample’s type as from the point of view of the concentration, which can be situated in domains from ppm order to percentage order. The method of inductively coupled plasma atomic emission spectrometry answers to these requirements, allowing the precise determination in large limits of concentration and in short time.
Keywords: ICP-AES, AAS.
DIFFERENT HEAT SUM CALCULATION METHODS IN MAIZE PRODUCTION
Dénes Áron Dorka
Abstract: Maize production is of primary importance in the world, especially considering that its cultivation takes up one of the greatest ratios of land used for agricultural production. As a result, the number of farms where maize is not cultivated for either food production or foraging purposes is insignificant. For this reason, establishing economic production is of decisive importance when it comes to determining the efficiency of farms. Profitable maize production depends on a number of conditions, including the professional suitability of farmers, while some aspects of production are independent from these. Heat-sum calculations form a transition from this aspect, since temperatures ocuring during the growing season cannot be influenced by man. However, the method of calculation and evaluation and thus the tool to improve production is in the hands of the farmer. This scientific paper aims to give a special description of heat-sum calculation methods.
Keywords: heat unit, photoperiod, solar radiation, base temperature.
ENGINEERING PEDAGOGY AS A PART OF EDUCATION AT THE SLOVAK UNIVERSITY OF TECHNOLOGY
Dušan Driensky, Roman Hrmo
Abstract: Article deals with teacher training of engineers, the IGIP (Internationale Geselschaft für
Ingenieurpädagogik/International Society for Engineering Pedagogy) National Group and IGIP Slovak National Monitoring Committee establishment, their role, orientation and development. Authors make an overview on current and prospective activities in the field at the Slovak University of Technology in Bratislava.
Keywords: Complementary teacher training of engineers, university course, engineering pedagogy, research work, PhD. study IGIP register and index.
DISSERTATION ON THE ELECTRIC AND ELECTRONIC USAGE OF TECHNICAL PLASTICS
Otto-Paul Eberst, Sever Pop, Elena-Angela Pop
Abstract: In this work we will present the plastic materials used in electronic industry and their applications. We’ll investigate the electrical isolation capabilities of polymers regarding their material structure.
Also, we’ll analyze characteristics of those plastic materials which are not conducting the electricity.
Keywords: semi-finished plastic products; electrical and electronic industry; conductive plastics.
MODERN LOGISTICS IN INDUSTRIAL MANUFACTURING
George ENCIU, Adrian NICOLESCU
Abstract: This work is part of a project on the potential contribution of electronics and information technologies to the logistics in industrial systems . By managing using RFID components and systems more effectively during use and in the transition technical, environmental and economic efficiency could be increased. This working paper provides a short overview of RFID technology and romanian S.I.M.I. concept . The principles of RFID technology are breifly explained and especially also our own applications realised with RFID passive and active technology.
Keywords: RFID, SIMI, ReaderNet, tag, reader.
THE COMPARISON BETWEEN ORCAD AND MATLAB ON TOLERANCE ANALYSIS FOR ANALOG CIRCUIT
Zoltan Erdei, Mircea Horgos
Abstract: The paper presents the tolerance influence of circuit elements on the performance of the entire system. It is described the analysis of electric circuit with ORCAD software , and also with personal software.
Keywords: analysis tolerance circuit, Monte Carlo method.
THE SQUEEZING AND EXAMINATION OF THE SEEDS OF VARIOUS PLANTS
Farkas Ferenc, Deák László
Abstract: Our cold mouldering examinations were performed on a two headed OP-222 screw-press in our Mechanical Department and on a one headed screw-press found in a private economy in Szeghalom. The aim of our research was to determine how the pressing output subject to unit of time change with the modification of the rpm of the screw or rather of the diameter of the nozzle, and to determine how the electric power needs of this change as well. During the measurements we used sunflower-, rape-, and flax seeds. QN-10 type electric measuring box was made use of in determining the electric power needs. Our further aim was to determine if there were such relations between parameters that can be described with mathematical-statistical methods.
Keywords: screw-press, pressing power, electric power needs, diameters of the nozzle.
CHANGES IN THE EXTENSIVE GRASSLAND UTILIZATION SUBSIDIES IN HUNGARY AT 2000 UP TO THESE DAYS
Istvan Forgó
Abstract: Assistance of the grasslands has changed several times in Hungary in the last few years. Assistance of these fields is serious, because grasslands are indispensable in the nature- and soil-protection and in the animal breeding. That fact shows its importance, as well as more than 18%-of the agricultural land is grassland in Hungary. The firs legislative provision was the National Agri-environment Programme in the year of 1999. The following provisions were the Agricultural and Rural Development Operational Programme and the National Rural Development Plan, which objectives similar to the National Agri-environment Programme. The National Rural Development Plan followed by the New Hungary Rural Development Strategic Plan, between the years of 2007 and 2013, which plan’s serious objective is the agri-environment protection (covers grasslands), closely connected with the Natura 2000 environment protection network.
Keywords: environment protection, grassland farming, sustainable development.
A PRACTICAL APPROACH IN THE FINITE ELEMENT METHOD STUDY OF A MECHANICAL PART
Ghionea Ionuţ
Abstract: The paper presents a practical application methodology in FEM analysis for the mechanical parts design. The procedure uses the CATIA CAD-CAE environment, where the 3D model preparation is simple and fast. The necessary calculations for the analyzed part are made using the finite element method. The purpose of this approach is to determine the resulting stresses under a loading case. Also, in the paper are presented many theoretical aspects in the FEM field of interest.
Keywords: CATIA, finite element method, finite element analysis, Von Mises stresses, displacements.
SPRINGBACK PREDICTION OF THE V BENDING PROCESS USING FINITE ELEMENT SIMULATION
Florica Mioara Groze; Gheorghe Achimaş, Lucian Lăzărescu, Vasile Adrian Ceclan
Abstract: This paper presents a study of springback in the V-bending metal forming process using the finite elements method. In order to elaborate the simulation model of the V bending process of sheet metals we established a set of parameters which have a significant influence on the springback in a V bending process: dimensional parameters of the raw part (rectangular strip), geometry of the tools and the elastic-plastic behavior of the material. The analysis is carried out using the commercial code ABAQUS. The forming process is simulated in two steps with ABAQUS/Explicit. The results are analyzed using Abaqus/CAE.
Keywords: Metal forming, Springback, Finite elements, V-bending.
EXAMINATION OF CONE-BELT DISPENSER
Zoltán HAGYMÁSSY
Abstract: In probe parcels the more and more precise labour quality demands require mechanization of experiments. Distributing different types of fertilizer more accurately and evenly necessary in experimental plots. A solution is offered to mechanisation of distributing fertilizer on probe parcels. A new plot fertilizer distributor was designed and built. I am outlining the principle working of plot fertilizer. The unevenness of spreading of each type is significantly influenced by the aberration of the vertical angle position of the cone-belt dispenser. A test-bench was collected to measure the aberrations. The measurement prove, that only a few degree deviation results in significant change in the unevenness of dispensing.
Keywords: plot, cone-belt dispenser, vertical angle.
CONTRIBUTIONS TO THE CALCULATION OF THE FORCE DEVELOPED BY THE ELECTROMAGNETS USING FEM
Mircea Horgos, Liviu Neamt, Olivian Chiver, Zoltan Erdei
Abstract: This paper presents results obtained for the calculation of the force developed by electromagnets for a given configuration using the finite elements method. The calculation was performed for five types of ferromagnetic materials and for different electrical charges of the electromagnet.
Keywords: sorting process, electromagnetic sieves, finit elemenet.
THE OBJECT´S DIGITIZING – THE REVERSE ENGINEERING PROCESS
Radovan HRIVNÁK, Ivan KURIC
Abstract: The contribution deals with the Reverse Engineering Process, it´s meaning and exploitation and especially with 3D scanning of object.
Keywords: The Reverse Engineering Process, digitizing, clouds points, 3D scannin, surface.
PRODUCTIVITY OF HORSERADISH VARIETIES IN CONSIDERATION OF ASSORTED RHIZOMA DISTRIBUTION
Katalin Oláh Irinyi
Abstract: The average yeild of horseradish is 7-8 t/ha besides good cropping technologie although certain populations can reach higher produce. In respect of profitability the root size is very important, because first class rhizomes are more marketable. For that very reason the root size is on important attribute of variety. This paper contains the result of a variety-comparison trial in consideration of rhizome size.
Keywords: horseradish, rhizome, quality classes, profitability.
MANUFACTURING STRATEGIES IN CAM SYSTEMS
Miroslav Janák
Abstract: The goal of this paper is to explain the reasons of importance of manufacturing strategies. High-level theoretical knowledge in this field allows an efficient improve of possibilities of its CAD/CAM integration. Real use of this knowledge, that is right choice of the manufacturing strategies with the use of computer aided system is the condition for raising manufacturing productivity by shortening manufacturing times and minimizing tool wear.
Keywords: CAD/CAM systems, manufacturing strategies, final strategies, residual manufacturing.
FURTHER RESEARCH OF ABRASIVE WEAR BEHAVIOUR OF ENGINEERING POLYMERS
Kalácska Gábor, Zsidai László, Bors Zoltán, Fenyvesi László, Eberst Ottó, Pop Sever
Abstract: To improve the abrasive wear behaviour of a certain tribo system – modifying the system -, there are more keys e.g. replacing the metal surface with a plastic one. If in a given tribo system the engineering plastic part can be acceptable from other engineering points (e.g. strength, life period and fatigue) than the proper plastic selection may improve the abrasive wear performance of the system. The proper plastic material selection is considered as a keyword, because each tribological system is different. Taking these into account, first, we have carried out some simply laboratory test have already been published. Following that we designed a real machine element test systems applying different plastic/metal gear pairs running in abrasive media. The conclusion of the systems and the comparison of the systems were published in different journals and a PhD thesis work was written.
But to clarify the real plastic material behaviour in case of abrasive particles we had to design a further test system, where the sliding plastic surface always act on a pure abrasive contact surface, which is not covered with transfer layer or third body particles. So, the sliding path to run is always clear. Some mechanical properties of the tested materials were measured at the Hungarian Institute of Agricultural Engineering and tribotesting was carried out at SZIU and UNBM. (OTKA T42511, NI 62729, INNOCSEKK, GVOP 3.3.).
Keywords: engineering polymers, abrasive wear.
THE CURRENT PERCEPTION OF REMANUFACTURING AS AN INDUSTRIAL ACTIVITY
Fedor Kallay, Dinu Darabă
Abstract: In order to avoid costly retrieving of equipment on their end of life, the designers should state the procedures of recovery – remanufacturing – recycling, before specifying their structural characteristics. The strategies of recovering the used equipment may include a combination of remanufacturing, recycling and disposal procedures.
Taking into account effectively the recycling capacity of equipment even since the design stage, enhances both the industrial ecology by rational use of natural resources and energy and the reducing of waste.
The remanufacturing of the technological equipment may be increased significantly by their projecting and design towards remanufacturing, looking for the principles of durable development.
Keywords: Remanufacturing, Recycling, Wear-out Life, Technological Cycle.
EXPERIMENTS ON THE MAXIMUM BIOGAS PRODUCTION
Kalmár Imre, Nagy Valéria
Abstract: The re-integration of structural formation of agriculture has come into limelight, as well as the notions of multifunctional agriculture one of which exercises is the cultivation of renewable raw materials, have appeared recently. Biogas, the main component of which is methane, takes form during the anaerobic degradation of biomass originating in the course of agricultural production. On the one hand, methane is combustible gas with great power energy; on the other hand it is also climatic gas. The energy produce from biomass is a future oriented technology which helps us – to a certain degree – to be independence of the utilisation of the fossil energy carriers while we burden our environment minimally.
Keywords: sustainable agriculture, biogas, technological experiments, increasing of biogas production.
DIELECTRICAL METHODS AS A POSSIBILITY TO INVESTIGATE THE STRUCTURAL CHANGES AND DEFECTS
Ján Kalužný J., Marian Kubliha, Vladimír Labaš, Marcel Poulain
Abstract: Measurement methods of temperature dependencies of direct electrical conductivity (dec) as well as frequency dependencies of complex permitivity (cp) and complex electrical modulus (cem), respectively, are perspective to search properties of in-ordered structures and also the macroscopic quantities which characterized studied material. Chemical and optical purities, the presence of physical (point) defects and defects of the larger dimension (micro-crystals, clusters etc.), the effect of admixtures and technology of production belong among them. Moreover they make possible to determine temperature and time stability of samples and to access their homogeneity and the application possibilities, as well.
Keywords: Heavy Metal Oxide Glasses (HMOG), structure, electrical properties.
CONSEQUENCE OF COMPUTER SIMULATION FOR VERIFICATION OF CLOSED DIE CAVITY SHAPE
Mária Kapustová, Miroslava Košťálová
Abstract: In present day the successful development and competitiveness of forges relates with feeding of simulation software into forgeds technical prepare of production. The staple offers to users for solving simulation of technological processes production relatively qualitative simulation software. The aim of the paper is focus on the importance of simulation software for material flow following in the cavity of die. The simulation proves to detect the possible mistakes of material flow, whose are reason of leads creation on forged. It is possible by adjusting of tool geometry to eliminate mistakes in preliminary phase of forged production, what presents production costs savings. Using of simulation software has big importance by successful development of new unconventional technologies in production praxis, because essentially reduces economical severity of proving processes in prepare phase of production.
Keywords: closed die forging, simulation, impression of die, wad shape.
DEVELOPMENT OF A PUSHING TOOL APPROXIMATING THE REAL TYRE MODEL
Zsolt Péter Kiss
Abstract: Carrying on the activities displayed in 2005, the main task in 2006 was specification of
conditions for measurements approximating the real tyre model and performing measurements as well.
Keywords: -.
POSSIBILITIES OF SOFTWARE APPLICATION USAGE DURING CREATION OF DISASSEMBLING PROCEEDINGS
Marek KOČIŠKO, Peter BRÁZDA
Abstract: Creation of visual disassembling proceeding in praxis accelerates activities connected with change of worn parts in concrete constructional nodes and allows executing disassembling activities to less skilled workers. For achieving of these goals it is necessary involve computer technique into pre-production stages. As suitable solution for seems application of modern CAPP systems in combination with other software assigned for animation.
Keywords: disassembly, CAPP systems, visualization.
ASPECTS OF “ENERGY WILLOW” (SALIX VIMINALIS L.) CULTIVATION
ATTILA KONDOR, ISTVÁN LENTI, BÉLA SZABÓ, SÁNDOR VÁGVÖLGYI
Abstract: Salix viminalis L. is native to this land. It has been cultivated at a smaller scale for making baskets and other household items.
„Energy willow” has catkin flowers, dicotyledonous, dioecious, arborescent, insect pollinated plant. It is deciduous and has cylindrical shoots. Its leaves are alternate and lance shaped. It is one of the fastest growing trees. Its shoot grow 3-5 cm a day. In first year it reaches 3-3.5 m in height and yields 8-10 tonnes/ha cuttings. It yields 20-40 t/ha following the third year. It has a high salicylic alcohol content, consequently a fairly high energy – 29,2 MJ/kg, as shown by Endre Kiss.
Growing this plant may bring the beneficial aspects of a decentralised energy system into consideration for a settlement rethinking the links between the settlement and its environment, in spite of biomass energy production has the largest potential though it will contribute only at a small scale to the renewable energy sources used in Hungary.
Keywords: Salix viminalis L., waste water treatment, energy crops, rural development.
GUESTFRIENDLY HUNGARIAN WINECELLARS
Kopcsay László
Abstract: The most serious problem of the Hungarian wine- growing is that market is
narrowing down. The position of Hungarian wine export was influenced in a negative way by
the international market as most Hungarian wine sorts could be highly successful in this
cathegory.
Keywords: -.
INTELLIGENT CLAMPING FIXTURES FOR BOX SHAPED WORKPIECES
PETER KOŠŤÁL, KAROL VELÍŠEK
Abstract: Today manufacturing processes are characterized as small batch production. Effective small batch production is possible only by using automation in all possible tasks of production. Very important task of automated small batch production is a workpiece clamping. The automated clamping tasks for this type of production contains several particular tasks to solving. One of them is a task of creating some intelligence in automated clamping device.
Keywords: manufacturing system, intelligent device, automated manufacturing.
DESIGNING VARIABLE PARTS OF SHEARING TOOLS BY HELP OF COMPUTER TECHNIQUE
Miroslava Košťálová, Mária Kapustová
Abstract: The paper is oriented for designing variable parts of forming tools. The most effective is manner creating digital tool model on base parametric models and creating of catalog from these models according to logical continuity. It ensures optimization of needed number of production method, rebate of tool assortment, sharing of attested designed solution. It was made database of model parts of tool, material database, dimensional database by help of variables. It was designed stands of shearing die and model of shearing die. It is possible visual control of shear die in the term of laps, it is possible to check function of tool after assignments of kinematics joins.
Keywords: variable parts, shear tool, parametric model, designing.
INFLUENCE OF SPRING SUPPORTED FRONT BRIDGE FOR THE PULLING FORCE OF JD6920S TRACTOR
Zoltán Kovács
Abstract: To judge and classify the performance of tractors, to study the pulling force of the tractors in operation, and to compare different brands of tractors have been carried out based on traction test. With these tests it is possible to measure the tractive pull performance of tractors, their economy and efficiency comparing them with other brands of tractors. A number of tractor manufacturing companies adapted the spring supported front bridge on their tractors of mass production. We examined, that how the application of a spring supported front bridge affects the pull force of the JD6920S tractor on arable land, and how various static axle loads modify it.
Keywords: spring supported front bridge, pulling force, tractor, slip.
LONG-FIBRE COMPOSITE EXPERIMENTAL MODELLING
Jan Krmela, Zdeněk Dvořák, Františka Pešlová
Abstract: The article deals with experimental modelling of single-layer long-fibre composite structures with a non-linear matrix and a steel reinforcement in the form of a wire or twisted wire. These specific composites are used in radial automobile tires as steel-belt layers. The article also deals with the design of the shape and geometric parameters of composite specimens taking into account the type of testing machine. The design was necessary since the shapes and parameters of the specimens for different forms of loading are not standardized.
Presented as examples of experimental modelling of composite specimens are results of tensile tests of single-layer specimens with selected cord angles with respect to the loading direction simultaneously with a variety of specimen widths.
Keywords: Composite structures, tire, long-fibre, single-layer, non-linear matrix, steel reinforcement, experimental modelling, tensile test, specimen design.
DYNAMIC CLASSIFICATION IN GROUP TECHNOLOGY
Ivan Kuric
Abstract: A framework for dynamic classification with computer aided process planning (CAPP) systems is presented. The dynamic classification is used to provide flexibility facility status information while the CAPP system is used to modify the retrieved process plans. The paper deals with aspect of classification systems in CAPP systems based on Group Technology (GT). The dynamic classification will be introduced as new method utilised especially for non-cutting technologies such as casting and forging.
Keywords: CAPP, Group technology.
THE APPLICATION OF ARTIFICIAL INTELLIGENCE METHOD IN ORGANIZATION OF MACHINING PRODUCTION PROCESS
Izabela Kutschenreiter-Praszkiewicz, Krzysztof J. Konsztowicz
Abstract: The paper discusses the application of artificial intelligence concept in determining labour consumption of selected production operations. The purpose of the work was to examine the possibility of neuron network application in prediction of time of thermo-chemical treatment of manufactured machine elements. Numerical experiments were carried out which enabled to select the appropriate structure of neuron network allowing for prediction of processing time. The analysis has been applied to real environment conditions related to manufacturing of toothed transmission gear.
Keywords: artificial intelligence, neuron network structure, labour consumption, thermo-chemical treatment, toothed gear.
PLASTIC MACHINE ELEMENTS OF SMALL AIRPLANE: EXAMINATION OF THE LANDING-GEAR LEG SUPPORT OF CESSNA 172
Lefánti Rajmund, Keresztes Róbert, Kalácska Gábor
Abstract: Our daily life is strongly connected to the modern materials e.g. polymers and composites. These materials play more and more important role in airplane and aviation technologies. Not only the common places but load-carrying machine elements are produced of light-weight and wear resistant plastics as well. In the aviation the machine reliability especially is important, so, the good friction and wear properties together with increased corrosion resistance and vibration damping ability, as well low mass features are essential. There are many sorts of technical polymers available of which sliding and load-carrying elements can be produced. To choose proper polymers for a given tribological application is not a simple task owing to many different parameters influencing the performance of a polymer sliding element.
Keywords: -.
THE VARIABILITY OF CHOSEN GEOMETRICAL PARAMETERS OF SURFACE LAYER DURING PULL BROACHING PROCESS
Stanislaw LEGUTKO, Tomasz KEDZIERSKI, Kazimierz WIECZOROWSK
Abstract: The purpose of this work was to settle a variability of chosen surface layer’s geometric parameters after pull broaching in the function of number of machined pieces. Expected effect of this work was to determine the value of chosen parameters of surface roughness after the determined time of pull broaching.
Keywords: broaching, surface layer, surface roughness.
MUSHROOMS LIVING AMONG US: MUSHROOMS–WORLD OF BÁTORLIGET
István LENTI
Abstract: On the East border of Hungary in Szabolcs-Szatmár-Bereg County has been found Bátorliget which has made an international name for itself in the scientific world due to its highly protected glacial swamp and pasture. At the far end of the village reaches the Fényi-forest as far as the county-frontier. These three, with all their historical pasts and improvements carry the formation and the structural changes of the Hungarian-plain. The highly protected nature-reserve consist of the glacial Bátorligeti virgin-bog the Bátorligeti or Nyomási herbage and the Fényi forest that we name altogether the Bátorligeti Nature Reserve.
Keywords: Bátorliget, mushroom, Fényi-forest.
METHODS FOR BUSINESS RESEARCHING
Gabriela LOBONŢIU, Mircea LOBONŢIU
Abstract: Generally, people use research to systematically discover some aspects which allow improving their own knowledge. Consequently, business and management researchers are conducting researches in order to identify various characteristics and problems related to those domains. Although procedures vary from one field of inquiry to another, there are identifiable features that distinguish scientific inquiry from other methods of developing knowledge.
Keywords: business research, management research, scientific method.
MILLING PROCESS MANAGEMENT
Mircea LOBONŢIU, Mircea HĂŞMĂŞAN
Abstract: Milling process are the most widespread operations among metal machining. The development of this process is due to a large variety of parts configuration, parts dimensions, precision al surface quality and economical efficiency which can be achieved by using this process.
To reach a high degree of competitively any workshop should have a wide technological base, with performant characteristics. A modern technological base means not necessary a state of the art machines, but it could reach a high performance by using performant cutting tools, combined with a correct technological management and technical knowledge.
Keywords: metal cutting, milling strategies, milling, HSM, HPM.
STUDY OF TOOTHED BELT TRANSMISSION IN CASE OF VARYING ANGULAR VELOCITY
László Lovas, Daniel Play, János Márialigeti
Abstract: Toothed belt transmissions are widely used for internal combustion camshaft timing transmissions. Timing belt transmission behavior is studied by numerical simulations. Problems of force variations into the belt and belt tensioner behavior are discussed within a wide range of angular velocities. Effects of tensioner stiffness variations and various tensioner damping cases are considered. Optimum magnitude of tensioner stiffness and damping are given.
Keywords: timing belt, numerical simulation, tensioner stiffness and damping.
COMPUTER AIDED MANUFACTURING – CAM SYSTEMS
Eduard Lörinc
Abstract: The goal of this paper is too briefly and comprehensively describe the main features of computer aided manufacturing systems (CAM) and to decrease the lack of information in this area. Maximal production asset can only be achieved by complex application of computer aided manufacturing systems into the all activities related to manufacturing realization, which means that besides design this application should affect the choice of manufacturing technology, workplace project, tools and fixtures project and manufacturing realization itself followed by checking of product quality.
Keywords: Computer Aided Manufacturing, CAM Systems, NC – Numeric Control, CNC – Computer Numeric Control.
PRECISE MACHINING AND RESIDUAL STRESSES
Jan Madl, Vaclav Koutny, Vitezslav Razek
Abstract: A surface is a layer with its own structure and properties. Machined surfaces affect the functional properties of produced surfaces. These properties are affected by many factors, e.g., by cutting temperatures, friction, deformations in the primary deformation zone, the secondary deformation zone, and the surface layer of the transient (machined) surface, by cutting edge radius, cutting tool geometry, work hardening, residual stresses, cutting environment, etc.
Keywords: precise machining, hard machining, surface integrity, residual stresses.
THE ROLE AND THE IMPORTANCE OF BUSINESS RELATIONS AND INFORMAL NETWORK IN THE OPERATION OF SME
Zoltan Magyar
Abstract: For the members of small and medium enterpreneurs one of the possible break out points is the integration in a dominant branc of industry. Such a carrier relation results in a special business situation influence int he general business or marketing strategy of small and medium enterprises. This new and specific situation has also greatimpact on those input business information which re-evaluates the potential role of the business relations.
Keywords: B2B markets, SME, business relations, marketing and value.
ROLE OF RISK FAMILY SOCIALIZATION FACTORS IN THE DEVELOPMENT OF DEPRESSION
Ferenc Margitics, Zsuzsa Pauwlik
Abstract: Objectives: The aim of this research was to discover on a non-clinical sample the risk factors having a role in the development of predisposition to depression. Methods: The sample was taken on the basis of the existence or lack of predisposing factor: 232 persons belonged to the group of imperilled people, and 219 persons were in the control group. Results: On grounds of a non-clinical sample our research substantiated that certain family socialisation factors may also play role as risk factors in the development of depression. We managed to substantiate that the primary risk factors were the punishing and neglecting way of breeding by parents, the manipulative, inconsistent and consistent educational attitudes, the conflict filled family attitude, and several elements of parental treatment.
Keywords: predisposition to depression, factors, family socialisation.
LOW-CARBON SHEET METALS TREATED BY NITROOXIDATION IN FLUID LAYER AND THEIR PROPERTIES
Milan Marônek, Roman Lazar, Mária Dománková
Abstract: The paper deals with fluid nitrooxidation technology applied to the low carbon steel sheet metals and influence of this process on mechanical properties, formability, structural changes and weldability of this way treated materials. Experiments showed significant increase of mechanical properties (strength and microhardness), moderate decrease of formability and 10-times increase of resistance to atmospheric corrosion in comparison to untreated materials. The optimal welding method appears to be laser welding.
Keywords: nitrooxidation, low-carbon steel sheet, welding, forming, corrosion resistance.
RAPID TOOLING TECHNOLOGIES FOR RIM MOULDS
János Marosfalvi, Péter Grőb
Abstract: To produce products from integrated polyurethane foam by Reaction Injection Moulding (RIM) beside traditional metal moulds recently often applied tools made by Rapid Tooling (RT). This statement is specially right at production prototypes, first series or in case of limited series. The aim of this paper is to describe a possible and economic engineering material for RIM tools.
Keywords: PUR, Reaction Injection Moulding (RIM),Rapid Tooling (RT), epoxy resin.
ANALYZING THE OPERATION OF ROTOR EXCAVATORS IN THE E.M.C. JILŢ OPEN PIT MINES
MIHĂILESCU SORIN, PRAPORGESCU GABRIEL
Abstract: The increase of the working efficiency of the excavator depends of its selection in concordance with the concrete working conditions and in correlation with the other equipments from the operation lines for lignite and waste extraction from the lignite seams roof. The mining equipment used at Jilt quarry was monitored for a certain period and based on the data gained during that period we have drawn up Pareto charts that highlight the subassemblies of those installations which have to be considered with the view to increasing the main indices which allow to calculate the reliability of rotor excavators.
Keywords: technologic flow, open pit, Pareto chart.
THE DOSE RATE MONITORING SYSTEM
Oliver Moravčík, Peter Schreiber, Pavol Tanuška
Abstract: The contribution deals with design of dose rate monitoring system. The entire system has been implemented for Nuclear Power Station SE-EBO Jaslovské Bohunice. The system consists of mobile unit with GPS, application server and display unit. The system has been developed in Borland Delphi, using ActiveMap components, that allow to develop powerful GIS applications.
Keywords: Dose Rate, Oracle 9i, GPS Garmin, ActiveMap component.
STUDIES ABOUT THE INFLUENCED OF THE SURFACE STATE ON A BEHAVIOR OF SOLID PARTICLES FINDED INTO AN AIR FLOW
Moşneguţu Emilian, Nedeff Valentin, Panainte Mirela, Savin Carmen, Măcărescu Bogdan
Abstract: An important factor in the aerodynamic sorting process represents the surface state of solid particle. In this work the results of studies concerning the influence of the surface state of solid particle over behaviour of particle in ascendancy vertical air flow, respectively the value of the floating speed of solid particle are presented.
The experimental determinations proved that the turbulence intensity of the air flow obtained “behind” of the solid particle is direct proportional with the value of the air flow speed and with the value of friction coefficient of the respective particle.
Keywords: friction coefficient, perimeter, the floating speed of particle, turbulence intensity.
THE APPLICATION OF KNOWLEDGE SYSTEM COMPONENTS IN CAD/CAM SYSTEM BASED ON XML LANGUAGE
Jaromír MURČINKO
Abstract: The paper deals with specific application of knowledge system in CAM system Pro/ENGINEER Wildfire using XML language. The knowledge for NC sequences generation of single operations is implemented by means of XML language. The time of CL data preparation for control system is much shorter by this way and the manufacturing productivity is direct proportionally higher. The XML language is the standard for web application and for data entry, which is simple and clear for large clientele of users in whole production company structure and its co-operators.
Keywords: CAM system, knowledge system, XML (eXtensible Markup Language) Language.
DEVELOPMENT OF SOPHISTICATED MATERIALS USING THE COMPUTER SIMULATION
Zuzana MURČINKOVÁ
Abstract: The paper presents computer simulation of composite materials behaviour reinforced by micro- and nano- particles and by short fibres. The computer simulation and development of computational methods specialized in nano-structures allow to development of modern sophisticated materials. The computational models enable the optimal design of reinforcing fibres for particular service conditions in order to define safe, light and reliable structures.
Keywords: multifibre composite structure, computational method, external finite element approximation, parameter, and sensitivity study.
DETERMINING SHEAR ELASTICITY MODULUS BY TORSIONAL PENDULUM
Sándor Nagy, Gergely Dezső, Attila Százvai
Abstract: When clamping the upper end of a thin bar or wire and fixing a circular plate to the bottom end of it, we get torsional oscillating system. The shear elasticity modulus can be calculated after determining the lowest root of the characteristic equation of the second order differential equation describing the torsion oscillation of the linear bar, and measuring experimentally the smallest natural frequency of the torsion oscillation.
Keywords: -.
MEASURATION OF GRINDING WHEEL DECREASE
Vladimír Náprstek, Nataša Náprstková, František Holešovský
Abstract: The grinding is important part of machining technology and inseparable part of this is a grinding wheel, too. Grinding wheel wearing is one from characteristic values of grinding process and its measuring is relatively complicated process. This article describes methods which are using or was developed or will input at FPTM.
Keywords: grinding, f grinding wheel loss, blade, microwave, laser.
THE EXPERT SYSTEM OF E-CREATIVE DESIGN FOR THE INOVATION IN THE FIELD OF THE INDUSTRIAL ACTUATORS
Vasile NASUI
Abstract: The research is destined to the development of an expert system, using the general principles of the invention and of the optimal design for the invention in the field of the industrial linear actuators by projection and creative techniques. The project contributes with some new solutions for the advanced systems of the action and control of the linear movement applicable in the production. On the basis of the existent experience in the field of the technical creation and creative projection we came up with a typical methodology for the creative synthesis of the actuator. The project has in view the previous results, which ensure the basic documentation, the necessary equipment and logistics under the form of the transfer of knowledge, the competence and the acquired experience.
Keywords: linear electromechanic actuator, e-creative design, e-learning, expert system, virtual simulation.
THE INFLUENCE OF THE ROTOR POLE SHAPE ON THE STATIC EFICIENCY OF THE SWITCHED RELUCTANCE MOTOR
Liviu Neamţ, Mircea Horgoş, Alina Neamţ
Abstract: This paper presents results of reductor switched reluctance motor static simulations by means of Finite Element Method. The dependence between machine performances and its rotor pole shape and electrical load, is studied and the results are displayed as curves, which offer a clear images of optimum geometry in terms of connection modes of each phase.
Keywords: reductor switched reluctance motor, finite element method, rotor geometry, connection modes of phase.
VIBRATION IN GRINDING OPERATION
Németh Štefan, Neslušan Mirosla
Abstract: This paper deals with vibration in grinding through analyse of grinding forces. There is presented analyse of self-excited vibration. There is a formation of waviness on the surface of grinding wheel and this waviness influences waviness on the ground surface. Process of the wheel wear, cutting conditions and the type of grinder strongly affect character of self-excited vibration.
Keywords: grinding, vibration, waviness, cutting force.
TURNING OF ROLL BEARING STEEL 100CR6 OF BAINITE STRUCTURE
Neslušan Miroslav
Abstract: This paper deals with turning of bainite roll bearing steel 100Cr6. There is presented significance of the correct heat treatment and its influence on the cutting process through the measurement of cutting forces and tool wear. The paper compares the results of turning of martensite and bainite structure.
Keywords: bainite, heat treatment, turning, wear.
VIRTUAL PROTOTYPE OF INDUSTRIAL ROBOTS AND FLEXIBLE MANUFACTURING CELLS USING CATIA
Adrian NICOLESCU, George ENCIU
Abstract: The paper presents advanced virtual prototyping modeling using Catia V5 of a flexible manufacturing cell for high speed machining, including a 5 DOF gantry robot, a linear axis part’s positioning system and a set of automatic closure doors delimitating a “protected area”. The 5 DOF gantry industrial robot is special dedicated for high speed machining of dies, as well as any other kind of similar parts including 3D complex surfaces. Synthetic details about IR’s parts, subassemblies and general assembly optimized design procedures as well as IR’s kinematics and IR’s overall functioning simulation are presented.
Keywords: industrial robots, optimum design, virtual prototyping, high speed machining, dies manufacturing.
APPLICATIONS OF THE GROUP TECHNOLOGY THEORY IN MANUFACTURING
Jozef Novak-Marcincin
Abstract: Group Technology is a manufacturing philosophy and strategy that assists a company in
understanding what it manufactures and how those products are then manufactured. GT provides a means to identify and exploit the “underlying sameness” or similarities of parts and processes. Once identified, it is possible to capitalize on these similarities by processing together groups of similar parts (families), by standardizing and simplifying closely related and repetitive activities to avoid unnecessary duplication of effort and by efficient storing and retrieving of information related to recurring problems, thereby avoiding solving the same problem again and again.
Keywords: group technology theory, CAPP systems.
AUGMENTED VIRTUAL REALITY APPLICATIONS IN MANUFACTURING SYSTEMS
Jozef Novak-Marcincin
Abstract: Augmented Reality (AR) is a growing area in virtual reality research. The world environment around us provides a wealth of information that is difficult to duplicate in a computer. This is evidenced by the worlds used in virtual environments. Either these worlds are very simplistic such as the environments created for immersive entertainment and games, or the system that can create a more realistic environment has a million dollar price tag such as flight simulators. An augmented reality system generates a composite view for the user. It is a combination of the real scene viewed by the user and a virtual scene generated by the computer that augments the scene with additional information.
Keywords: Virtual Reality, Augmented Virtual Reality, Manufacturing Systems Design.
DETERMINATON OF VELOCITY DISTRIBUTION AT SILO OUTLET
István OLDAL, Béla M. CSIZMADIA
Abstract: Silo is widespread solution for storing granular materials. Similarity between behaviour of granular materials and fluids allow of storing in silos. These behaviours are flowing during filling and discharging. Predicting of arching and discharge rate is required for silo designing. There are two methods to predict of discharge rate Johanson’s method and Beverloo’s one. In these models velocity is constant along outlet. Our new model prediction of velocity is not constant. There is good agreement between results of our model and experimental analysis. Our model gives good describing velocity of flowing along outlet. And the model explain for independence of velocity from filling height of silo.
Keywords: silo, granular material, discharge rate.
SYNDROMES OF DEPRESSION IN ADOLESCENT AGE
Zsuzsa Pauwlik, Ferenc Margitics
Abstract: Objective: The aim of our research was to reveal the rate of occurrence of the symptoms of depression among the adolescent, and the interrelation between each symptom of depression and the sex. Methods: 423 adolescents were involved in the survey, students of secondary schools and secondary grammar schools. (235 girls and 188 boys). For measuring the rate of depression the abridged version of Beck’s Depression Inventory (including 13 items) was applied. Results: We found a considerably high rate of occurrence of depressive syndromes among adolescents; and an especially high rate of occurrence of such syndromes was revealed among adolescent girls.
Keywords: adolescent, depression, depressive syndrome.
VERTICAL PATH STRATEGY FOR 3D-CAD ANALYSIS OF CHIP AREA IN 3-AXES BALL NOSE END MILLING
Eugen Pay, Marius Cosma
Abstract: Vertical cutter path orientations strategy is investigated and evaluated in this 3D-CAD study, for the chip area, in upward and downward feed directions of ball nose end mill, for different workpiece inclination angle. A minimum workpiece inclination angle to avoid cutting at the tip of the cutter is defined such the angle between cutter axis and surface normal. The result of analysis between the chip area and the inclination angle has been shown in graphics, for one cutting edge rotation. The cutting force on the tool edge is in proportion with the chip area and using this study, can be predicted the inclination angle and direction of milling to improve the cutting performance.
Keywords: Ball Nose End Milling, Chip Area, 3D-CAD, Vertical Upward, Vertical Downward.
