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COMPUTER AIDED PROCESS PLANNING SYSTEM FOR PIPE WELDING
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Then, the dimensionai tolerance chain method is used to check the operational tolerances of the generated plan.
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- Computer aided process planning（CAPP）.
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The operational tolerances have to be made closer if the designed tolerance requirements are not met. However, the economy of manufacture and the increase in the overall accuracy of many products can be greatly improved by the use of properly selected and specified datums for positioning purpose. How to generate feasible and economical operation sequences with specified datum elements and setups according to designed dimensional and geometric tolerances, how to evaluate altemative setup plans, and how to use computers to do it automatically have not been addressed.
Computer-Aided-Process-Planning-CAPP - Computer Aided...
In this study, a graphical approach and a rulebase are developed and a neural network approach experiment is conducted for automated tolerance based analysis and selection of setups and datums for CAPP systems. The approaches and rules are based on a detailed analysis of the assembly tolerance analysis versus operational tolerance analysis, manually operated machining versus numerically controlled machining, and design datums versus machining datums.
The knowledge and rules obtained in this study are used to train a back-propagation neural network to select datums and setups. The CAPP logic is then applied to five example assemblies; each assembly is composed of between four and six commonly used pipe parts. For machine selection, the examples consider three commonly available mechanized welding machines and a manual welder.
The returned process plans demonstrate the ability of the proposed decision logic to create process plans for fabricating the pipe assembly with the maximum use of automated equipment and the minimum number of setups at that automation level.