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A STUDY ON MINIMUM-COST PROCESS PLANNING FOR PRISMATIC PARTS WITH DIMENSIONAL TOLERANCES
|關鍵字:||Dimensional Tolerance;尺寸公差;CAPP;PRISMATIC PARTS;process planning;電腦輔助製程規劃;方型工件;製程規劃||出版社:||機械工程學系||摘要:||
Tolerancing data are critical information in product life cycle. However, process plan determines the quality, yield rate, and cost at production stage. In this thesis, we developed a method for process planning of prismatic parts with dimensional tolerancing (DT) specifications. The method integrates process yield rate and cost based on manufacturing features and dimensional tolerances of a part as well as accuracies of machine tools. With tolerancing information and manufacturing capability of machine tools, cost of rework due to limited yield rate is also considered as that adds to the manufacturing cost. A rule of thumb for fast process planning, when machine tools are already selected, is also used to speed up the planning process. Combining the above two methods, the least-cost process for prismatic parts can be planned. A software prototype is then designed and implemented based on the above methods as a proof of feasibility. It takes the advantage of using data bases and computation capability of a computer to integrate manufacturing resources and product DT specifications. It calculates the yield of machining processes, selects the minimum-cost processes. It is found in this thesis that the process plan with yield rate do affect production cost. Manufacturing cost of the same yield with different machine tools can be increased up to two times
|Appears in Collections:||機械工程學系所|
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