nt such asa set of machinery or the product line can be selected to insure the stamping die meets design specifications. For example, Fig. 9 shows generation routes of process planning for the automobile panel shown in Fig. 3. During process planning, different process routes can be found by different planners; therefore, the best process route should be selected according to the batch of production, design and manufacturing of stamping dies, cost, etc. while tool options, the equipment and dies for each process should be assigned to meet design specifications, and to achieve minimum machining time and maximum efficiency. Finally, the optimization of process planning [20] is realized for multiple purposes (best- quality, maximizing efficiency, minimizing cost and time) by PPO based on KBE.
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