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Using a CATS database for alternative machine loading
Journal of Manufacturing Systems Volume 12/No.t
Cumulative Abstract Index
Keywords: Compute~ Integrated Manufacturing, Decision Support, Economic Analysis, Batching, Scheduling, Tooling Integration of Job Shop Control Systems: A State.of.the.Art Rev/ew, A. Bailakur, H. Steudel, pp. 71-80 Important theoretical and practical developments in job shop control are reviewed. The distinguishing feature of this paper is the identification and summary of important concepts and procedures useful for incorporation into computerized job shop control systems. The first section briefly examines the job shop control problem, and presents a broad outline of commonly used subproblems and methods. A review of the past work done in the areas of scheduling and sequencing, workload balancing, work flow structure analysis, and job shop capability evaluation is presented. The final section lists important concepts and procedures for developing computer-integrated job shop control systems. Keywords: Job Shop Control, Scheduling, Sequencing, Workload Balancing, Time Series, Computer Integration Pierce Point Minimization and Optimal Torch Path Determination in Flame Cutting, U. Manber, S. Israni, pp. 81-91 This paper addresses the problem of sequencing a torch for the cutting of a stock sheet nested with regular or irregular parts. Keywords: Torch Path Sequencing, Flame Cutting, Part Nesting, Enierian Graphs, Trim Margins, Pierce Points, Blowthroughs Computer-Aided Design of Form RoUsfor NC Manufacture, D. Milner, K. Ng, pp. 91-98 Computer-aided design (CAD) and computer-aided manufacture (CAM) are two modern areas of computer application that have decisive influence in the manufacturing industries. The recognition of the potential of CAD/CAM is worldwide and many have taken advantage of the new technology. The design and manufacture of form rolls and the special tooling used in cold roll forming of the thin walled metal sections are areas where the CAD/CAM approach can make a positive computer-aided tool for creating form roll designs suitable for NC (numerical control) manufacturing. This work was undertaken by the Department of Production Technology and Production Management at the University of Aston in Birmingham in collaboration with a leading manufacturer of thin walled sections. Si[~nificant improvement of lead time and productivity in both design and manufacturing of form rolls have been accomplished. Keywords: CAD/CAM, Form Rolls, Numerical Control
Keywords: CATS, Machine Balancing, Alternative Machine Routings, Loading Algorithms, Machine Balancing, Machine Selection High-Level Planning and Control: An IDEF Analysisfor Airframe Manufacture, G. Mackulak, pp. 121-34 This paper presents an overview of a high-level planning and control system (HLPCS) designed to permit CAD/CAM integration of the manufacturing processes of a generic airframe manufacturing facility. Keywords: High Level Production Control, Integrated Computer Aided Manufacturing (ICAM), Hierarchical Control Generating Pallet Loading Patterns with Considerations of ltem Stacking on End and Side Surfaces, H. Steudel, pp. 135-44 In this paper, a new three-phase heuristic is presented that extends the 1979 recursive procedure and evaluates the option of stacking items on their end and/or side surface within the best loading pattern of bottom-stacked items. The resulting pattern is then projected into the third dimension to generate the total "cubic" pallet load. Computation results show that end and/or side stacking (when applicable) can yield average improvements in the range of 5% in items per pallet load. Pallet Loading Patterns, Cutting Stock Problem, omputer Aided Design, Dynamic Programming Shop Floor Control Using the TacticalRatio and Monitoring System, H. Smart, pp. 145-52 In the fall of 1979, a decision was made by a manufacturing group steering committee to develop a system of shop floor control that recognized the reality of doing business in a practical rather than a theoretical way. A system was required that was capable of handling the management of work-in-process lots--as one group executive vice-president put it--in the trenches. Typical problems had to be dealt within the system such as additions, cancellations, pull ups, push outs, customer emergencies, delivery dates, short lead times, etc. The initial approach was to investigate the many software packages available on the market. A team of three manufacturing and data processing representatives was formed to undertake the search. After months of analysis and reviews, the conclusion was reached that a commercial system was not available to deal with the myriad of problems encountered every day in shop floor control. Keywords: Shop Floor Control Systems, Manufacturing Scheduling, CIM, CAM, PMS CATA---A Computer-Aided Tolerance Control System, R.
19841 Vol. 3/No. 2 Using a CATS Databasefor Alternative Machine Loading, S.Hankins, R. Wysk, K. Fox, pp. 115-20 Industry is currently utilizing the computer to generate shop time standards. A logical extensmn of these systems is to include the ability to generate alternative standards, which then permits alternative machine routings. The purpose of this paper is to discuss the advantages of using alternative machine shop. Through an example problem, it is shown that total production requirements are completed sooner by using alternative machines, and overall machine utilization is improved.
Ahluwalia, A. Karolin, pp. 153-60 Computer utilization in manufacturing systems is increasing at a rapid rate. Developments thus far have been disjointed. Much work needs to be done in the area of integrating computer-aided design and computer-aided manufacturing (CAD/CAM). Tolerance control is an important component in the integration of CAD and CAM. Selection of design tolerances affects the buildability ot aproduct. The selection of manufacturing processes and sequence of processes affects process tolerance stacking. Unexamined process tolerance stacking leads to scrap and rework. A computeraided tolerance control(CATC) system is presented in this paper. This system is based on the tolerance chart technique. The CATC system is interactive and uses computer graphics for information display. The system can be used for computer-aided process planning (CAPP) and for CAD/CAM integration. Keywords: Computer Aided Design, Computer Aided Manufac-
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Cumulative Abstract Index
Keywords: Compute~ Integrated Manufacturing, Decision Support, Economic Analysis, Batching, Scheduling, Tooling Integration of Job Shop Control Systems: A State.of.the.Art Rev/ew, A. Bailakur, H. Steudel, pp. 71-80 Important theoretical and practical developments in job shop control are reviewed. The distinguishing feature of this paper is the identification and summary of important concepts and procedures useful for incorporation into computerized job shop control systems. The first section briefly examines the job shop control problem, and presents a broad outline of commonly used subproblems and methods. A review of the past work done in the areas of scheduling and sequencing, workload balancing, work flow structure analysis, and job shop capability evaluation is presented. The final section lists important concepts and procedures for developing computer-integrated job shop control systems. Keywords: Job Shop Control, Scheduling, Sequencing, Workload Balancing, Time Series, Computer Integration Pierce Point Minimization and Optimal Torch Path Determination in Flame Cutting, U. Manber, S. Israni, pp. 81-91 This paper addresses the problem of sequencing a torch for the cutting of a stock sheet nested with regular or irregular parts. Keywords: Torch Path Sequencing, Flame Cutting, Part Nesting, Enierian Graphs, Trim Margins, Pierce Points, Blowthroughs Computer-Aided Design of Form RoUsfor NC Manufacture, D. Milner, K. Ng, pp. 91-98 Computer-aided design (CAD) and computer-aided manufacture (CAM) are two modern areas of computer application that have decisive influence in the manufacturing industries. The recognition of the potential of CAD/CAM is worldwide and many have taken advantage of the new technology. The design and manufacture of form rolls and the special tooling used in cold roll forming of the thin walled metal sections are areas where the CAD/CAM approach can make a positive computer-aided tool for creating form roll designs suitable for NC (numerical control) manufacturing. This work was undertaken by the Department of Production Technology and Production Management at the University of Aston in Birmingham in collaboration with a leading manufacturer of thin walled sections. Si[~nificant improvement of lead time and productivity in both design and manufacturing of form rolls have been accomplished. Keywords: CAD/CAM, Form Rolls, Numerical Control
Keywords: CATS, Machine Balancing, Alternative Machine Routings, Loading Algorithms, Machine Balancing, Machine Selection High-Level Planning and Control: An IDEF Analysisfor Airframe Manufacture, G. Mackulak, pp. 121-34 This paper presents an overview of a high-level planning and control system (HLPCS) designed to permit CAD/CAM integration of the manufacturing processes of a generic airframe manufacturing facility. Keywords: High Level Production Control, Integrated Computer Aided Manufacturing (ICAM), Hierarchical Control Generating Pallet Loading Patterns with Considerations of ltem Stacking on End and Side Surfaces, H. Steudel, pp. 135-44 In this paper, a new three-phase heuristic is presented that extends the 1979 recursive procedure and evaluates the option of stacking items on their end and/or side surface within the best loading pattern of bottom-stacked items. The resulting pattern is then projected into the third dimension to generate the total "cubic" pallet load. Computation results show that end and/or side stacking (when applicable) can yield average improvements in the range of 5% in items per pallet load. Pallet Loading Patterns, Cutting Stock Problem, omputer Aided Design, Dynamic Programming Shop Floor Control Using the TacticalRatio and Monitoring System, H. Smart, pp. 145-52 In the fall of 1979, a decision was made by a manufacturing group steering committee to develop a system of shop floor control that recognized the reality of doing business in a practical rather than a theoretical way. A system was required that was capable of handling the management of work-in-process lots--as one group executive vice-president put it--in the trenches. Typical problems had to be dealt within the system such as additions, cancellations, pull ups, push outs, customer emergencies, delivery dates, short lead times, etc. The initial approach was to investigate the many software packages available on the market. A team of three manufacturing and data processing representatives was formed to undertake the search. After months of analysis and reviews, the conclusion was reached that a commercial system was not available to deal with the myriad of problems encountered every day in shop floor control. Keywords: Shop Floor Control Systems, Manufacturing Scheduling, CIM, CAM, PMS CATA---A Computer-Aided Tolerance Control System, R.
19841 Vol. 3/No. 2 Using a CATS Databasefor Alternative Machine Loading, S.Hankins, R. Wysk, K. Fox, pp. 115-20 Industry is currently utilizing the computer to generate shop time standards. A logical extensmn of these systems is to include the ability to generate alternative standards, which then permits alternative machine routings. The purpose of this paper is to discuss the advantages of using alternative machine shop. Through an example problem, it is shown that total production requirements are completed sooner by using alternative machines, and overall machine utilization is improved.
Ahluwalia, A. Karolin, pp. 153-60 Computer utilization in manufacturing systems is increasing at a rapid rate. Developments thus far have been disjointed. Much work needs to be done in the area of integrating computer-aided design and computer-aided manufacturing (CAD/CAM). Tolerance control is an important component in the integration of CAD and CAM. Selection of design tolerances affects the buildability ot aproduct. The selection of manufacturing processes and sequence of processes affects process tolerance stacking. Unexamined process tolerance stacking leads to scrap and rework. A computeraided tolerance control(CATC) system is presented in this paper. This system is based on the tolerance chart technique. The CATC system is interactive and uses computer graphics for information display. The system can be used for computer-aided process planning (CAPP) and for CAD/CAM integration. Keywords: Computer Aided Design, Computer Aided Manufac-
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