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Sequence planning for bending operations in progressive dies

机译:渐进模头弯曲操作的顺序计划

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This paper aims to study the use of the superimposition scheme to quickly plan the bending sequence in a progressive die design for a sheet metal part which contains bending and shearing features, and to determine the best anaong multiple feasible solutions. The biggest problem in applying superimposition is that the possible solutions form an excessive solution space when multiple punches are used. In order to solve this problem, this paper introduces three steps: strip preparation, punch layout, and layout evaluation. The punch layout uses clustering rules to classify punches into five groups: prior use (the punches must be used first), posterior use (must be used last), simultaneous use (must be used together), sequential use (certain punches must precede others), and exclusive use (must not be used together). It then derives the compatible sets for each punch, followed by an expansion of the number of punches and punch layout, in order to obtain every feasible solution. The layout evaluation adopts a multiple-criteria decision-making (MCDM) model with a scoring function to analyse every feasible solution and determine the best sequencing plans. The scoring function used is based on the following four criteria: number of stages, moment balancing, strip stability, and feeding height. In the conclusion, this paper builds up a pilot system and demonstrates how the method can generate bending sequences and produce strips.
机译:本文旨在研究叠加方案在具有弯曲和剪切特征的钣金零件的渐进式模具设计中快速规划弯曲顺序的过程,并确定多种可行方案中的最佳方案。应用叠加的最大问题是,当使用多个打孔器时,可能的解会形成过多的解空间。为了解决这个问题,本文介绍了三个步骤:带材准备,打孔布局和布局评估。打孔器布局使用聚类规则将打孔器分为五类:先用(必须先使用打孔器),后用(必须最后使用),同时使用(必须一起使用),顺序使用(某些打孔器必须先于其他打孔器) )和专有使用权(不得一起使用)。然后,它为每个打孔器导出兼容集,然后扩展打孔器的数量和打孔器布局,以获得每种可行的解决方案。布局评估采用具有评分功能的多准则决策(MCDM)模型,以分析每个可行的解决方案并确定最佳的排序计划。使用的评分功能基于以下四个标准:级数,力矩平衡,带钢稳定性和进料高度。最后,本文建立了一个试验系统,并演示了该方法如何产生弯曲序列和产生带钢。

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