Communications - Scientific Letters of the University of Zilina, 2000 (vol. 2), issue 1
Articles
Product Modelling for AAC/CAPP Integration
Janusz Pobożniak
Communications - Scientific Letters of the University of Zilina 2000, 2(1):4-9 | DOI: 10.26552/com.C.2000.1.4-9 
The key condition for achieving the full automation is the integration of CAD/CAPP/CAM systems. The important element in the development of computer aided production preparation system is product modelling. The most widely known modelling method is feature based modelling. The mentioned method is very promising because it can extensively use the geometric model created in CA system. The enhancement of product information exchange between systems working in CE environment can increase the level of computer automation. The proposed system architecture fulfilling the requirements is presented in the article.
Generative System for Manufacturing Process Planning
Jan Duda
Communications - Scientific Letters of the University of Zilina 2000, 2(1):10-16 | DOI: 10.26552/com.C.2000.1.10-16
The paper presents the basic approach for the expert process planning - generative method for planning of the manufacturing processes. The methodology of process plan, structure of manufacturing processes, modelling of processes are key tasks of exact generative methods of creation of process plans. Conclusion of papers describes the expert system EXSYS as a basic tool for development of generative process planning system. In this paper a domain - specific expert system architecture with special emphases put on the control mechanism is presented. Procedurally encoded control mechanism is driven by explicitly represented declarative control knowledge,...
The Activities Changing the State of The Object in the Machining and Assembling Process and their Formalization
Andrzej Samek
Communications - Scientific Letters of the University of Zilina 2000, 2(1):17-21 | DOI: 10.26552/com.C.2000.1.17-21
The machining and assembling processes are discrete sequences of activities causing the change of semi-products into the finished parts, and assembling the parts into the final product. In computer aided process planning the precise and formalized description of activities is necessary. In the paper a conception of formalization of the activities changing the part characteristic is presented. The proposed description may be useful for process planning.
An Object Oriented Process Planning System for Rotational Components
P. C. Pandey, Nahid Rumana
Communications - Scientific Letters of the University of Zilina 2000, 2(1):22-26 | DOI: 10.26552/com.C.2000.1.22-26
This study presents an object oriented approach for the development of a process planning system for axis symmetric rotational components. The system consists of two modules: Part design data and manufacturing data input module and Object oriented process planning module (OOPP). Part data input module is created in customised AutoCAD environment. All the information about the input in the AutoCAD can be exported as DXF output file. DXF output file is automatically postprocessed in OOPP module to create object classes according to the input from this module. These classes are used by the sub modules: e.g., extraction of machinable volumes, setup planning,...
Image Processing Algorithms Used in Robotics Applications
Gheorghe Lazea, Alin Muresan, Emil Lupu
Communications - Scientific Letters of the University of Zilina 2000, 2(1):27-31 | DOI: 10.26552/com.C.2000.1.27-31
The paper presents the results obtained in implementing image-processing algorithms (edge detection, contour closing, skeletonizing). Several classical as well as two original algorithms are presented, together with sample images from the implementation. Image processing for robotic applications requests fast computation times. We investigate the possibility to improve the processing time of a classical skeletonizing algorithm (Nacache and Shingal method) using a previously trained neural network. Two approaches are considered: a two layers neural network and a cluster of 12 single layer neural network. The processing times obtained are presented and...
Inteligent CAD-CAP Interface Based on Feature Recognition nd Genetic Algorithm
Miran Brezocnik, Igor Drstvensek
Communications - Scientific Letters of the University of Zilina 2000, 2(1):32-38 | DOI: 10.26552/com.C.2000.1.32-38
The integration of production depends mainly on an automation level of the existing production cells that will be integrated into a common information system. In terms of CIM it means integration of CAD and CAM tasks. The integration also demands taking the CAP tasks into an account, because of their intermediate position. The paper describes an intelligent interface for integration of CAD and CAP tasks. It consists of two parts, recogniser and seeker. The recogniser scans the CAD model and recognises its features. The seeker uses the results of the recogniser as an input and searches the appropriate work operation from the technological database....
A Methodology for Cellular Manufacturing Design
Thomas Rist, Róbert Debnár, Jozef Krišťák
Communications - Scientific Letters of the University of Zilina 2000, 2(1):39-44 | DOI: 10.26552/com.C.2000.1.39-44
The realisation of benefits expected from cellular manufacturing largery depends on how effectively the three phases of design have been performed, namely part/machine grouping, developing the cell layout and cell system layout on the shop floor. This key question of cellular manufacturing has attracted numerous attempts in applying various design methods. This paper presents a new methodology for cellular manufacturing design. The proposal methodology is composed from products analysis, production segmentation, cells definition, cells capacity planning, cells layout design, building of simulation model and simulation process. Recently, simulation...
A Coding and Classification as an Aspect af System Flexibility in Sheer Metal Manufacturing
Vojo Visekruna, Darko Petkovic
Communications - Scientific Letters of the University of Zilina 2000, 2(1):45-50 | DOI: 10.26552/com.C.2000.1.45-50
Industry increasingly faces the need to respond rapidly and effectively to ever changing market demand. This need is partially met by introducing a high degree of flexibility into all industry phases, especially manufacturing. Group technology idea has been widely applied to the metal cutting area. In many instances, significant productivity gains have been achieved. However, very little work has been reported in applying GT in the sheet metal manufacturing. Sheet metal parts produced in sheet metal process with/without plastic deformation (pressing, punching, bending, etc) are on the increase. These processes are becoming one of the major manufacturing...
Compact Manufacturing Systems Structural Synthesis Automation
Dmitry Svirsky
Communications - Scientific Letters of the University of Zilina 2000, 2(1):51-56 | DOI: 10.26552/com.C.2000.1.51-56
In the paper the problems of collective designing of modern industrial systems in the "Lean Production" concept are considered. The definition of compact manufacturing system (CMS) is given, and the original principles of industrial compactness maintenance have resulted. On the basis of these principles the author offers the technique of designing CMS, formalized up to an integrated algorithm. The result of industrial and operating cycle semiotic modeling was fixed in a basis of the author's version of simultaneous designing, which is realized at the CAD Centre at Vitebsk state technological university. Both the configuration of the Centre computer...
Computer Integrated Flexibile Manufacturing Cell
Zenobia Weiss
Communications - Scientific Letters of the University of Zilina 2000, 2(1):57-61 | DOI: 10.26552/com.C.2000.1.57-61
The paper describes the flexible manufacturing cell (FMC) created in INCO-Copernicus Project. "Product and Process Data Modelling for FMC - PPDM-MC" (CP-960052). The FMC is integrated with computer systems as: CAD, CAD/CAM, PPC and SFC, which makes the flow of information possible between them and the demonstration of the full manufacturing cycle in the FMC. In the flexible manufacturing cell rotating and prismatic parts can be manufactured. Using simulation devices FACTOR AIM and Roans enables to make simulation experiments, which provide the data for optimisation of product and process data design in FMC.
Internet - Enablke Approach to Development of Technological Environment of Cam Systems for Smes
Zbigniew Adamczyk
Communications - Scientific Letters of the University of Zilina 2000, 2(1):62-69 | DOI: 10.26552/com.C.2000.1.62-69
A new approach to CAM system development is necessary to improve economical aspects of CAM applications particularly in SMEs. Technological environment is one of the factors influencing effectiveness of CAM exploitation. The paper present apromising approach to creation of distributed technological environment available on the Web.
CAD/CAM System for Insole Production
Toma Udiljak, Karlo Obrovac, Igor Ištef
Communications - Scientific Letters of the University of Zilina 2000, 2(1):70-76 | DOI: 10.26552/com.C.2000.1.70-76
Impressive strides in medicine enhanced a necessity for highly advanced computer systems which would provide measurement and visualization aids with a high degree of accuracy, and high standards for planning and application of specific medical procedures. Orthopaedy, as amedical branch, was enriched for anew approach in design and application of orthoses and prostheses, CAD/CAM. This paper gives an overview about biomechanical characteristics of the foot, which directly implies the features of the future insole. Because of the unity of each foot, the principle of universality, i.e. mass production of insoles, does not give the expected results. Therefore,...
Tribological Behaviour of Bonded Solid Lubricant Film in Air and in Vacuum
Changsheng Li, Yoshinori Takeichi, Shinya Shimizu, Masao Uemura, Marian Dzimko, Yuko Tsuya
Communications - Scientific Letters of the University of Zilina 2000, 2(1):77-83 | DOI: 10.26552/com.C.2000.1.77-83
The friction tests of inorganic bonded composite solid lubricant films (WS2, graphite, BN) were performed in laboratory air and in 10-4 Pa vacuum. The wear traces and transfer films were characterized by scanning electron microscopy (SEM), and Auger electron spectroscopy (AES). Experimental results suggest that when friction tests were conducted in air, graphite plays agoverning role, while in vacuum WS2 plays agoverning role. In case of changing atmosphere from air to vacuum or from vacuum to air, the composite film showed better friction behaviors in vacuum than in air.
Methodology for the Development of Step/Express Applications in the Area of Process Plannin
Irina Neaga, Ivan Kuric
Communications - Scientific Letters of the University of Zilina 2000, 2(1):84-87 | DOI: 10.26552/com.C.2000.1.84-87
The paper deals with the research related to the development of a generic methodology which enables the interaction of STEP/EXPRESS based models, and tools for specific applications in the area of process planning.
Information Exchange Problems Between 3D Modelling and Process Planning Modules
Jyri Papstel, Alo Saks, Indrek Kiolein
Communications - Scientific Letters of the University of Zilina 2000, 2(1):88-92 | DOI: 10.26552/com.C.2000.1.88-92
The objective of this project is to develop atool for communication between 3DCAD and process planning. Our accomplishments so far have been: (i) Transfer of the CAD data model and other product information from the 3D CAD system (Solid Edge) to a database module, (ii) the part/detail and feature classification module. The approach is based on STEP technology to define computer-aided tools for data structuring and management of product knowledge implemented on the relational database. Problems of part and form feature description play a crucial role in this framework. In 3D modelling Form Feature (FF) based design activities are the most effective...
The Rock Island Line is Mighty Fine Line
Andy Piasecki
Communications - Scientific Letters of the University of Zilina 2000, 2(1):93-97 | DOI: 10.26552/com.C.2000.1.93-97
Research into information and communication technologies tends to be dominated by the perspectives of technological determinism and theories of social shaping. Actor-network theory has emerged as an alternative approach for understanding and interpreting sociotechnical change. It has been applied to a wide variety of technologies and been used to explore how technology both constructs and is constructed by different stakeholder groups and how companies promote their interests through published texts and the courts to "seize control" of technological developments (Bowker, 1992). This article borrows from actor-network theory in order to explore how...