Optimisation of multi-point forming process parameters
Optimisation of multi-point forming process parameters
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DOI：
10.1007/s00170-017-0155-y
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发表时间：
2017-09-01
影响因子：
3.4
通讯作者：
Duc Pham
中科院分区：
文献类型：
--
作者：
Abosaf, Mohamed;Essa, Khamis;Duc Pham
由于零件设计的快速变化以满足客户的要求，特别是在汽车行业，对使用可重构模具的钣金成形的需求增加了。与实体模具相比，可重构模具的制造成本相对较低，并且可以很容易地改变同一工具以生产不同的零件。以前的研究主要集中在避免缺陷，而没有考虑到工艺对制造零件质量特性的影响。研究了弹性垫厚度、摩擦系数、销尺寸和曲率半径等参数对柔性多点冲压模具成形件质量的影响。其目的是确定这些参数的最佳值。采用有限元方法对半球形零件的多点成形过程进行了数值模拟。利用响应面法，研究了工艺参数对起皱、偏离目标形状和厚度变化的影响，得到了产生最佳产品质量特性的工艺参数。结果表明：销尺寸和曲率半径对起皱和成形与目标形状偏差影响最大，而摩擦系数、销尺寸和曲率半径对厚度变化影响显著；
The need for sheet metal forming using reconfigurable dies has increased due to rapid changes in part design to meet customer requirements, especially in the automotive industry. Reconfigurable dies have relatively low manufacturing cost compared with solid dies, and the same tool can be readily changed to produce different parts. Previous investigations have focused on avoiding defects without taking into account the effects of process on the quality characteristics of fabricated parts. This study investigated the influence of parameters, such as the elastic cushion thickness, coefficient of friction, pin size and radius of curvature, on the quality of parts formed in a flexible multi-point stamping die. The aim was to determine the optimum values of those parameters. Finite element modelling was employed to simulate the multi-point forming of hemispherical parts. Using the response surface method, the effects of process parameters on wrinkling, deviation from the target shape and thickness variation were investigated and the process parameters yielding the best product quality characteristics were obtained. The results show that pin size and radius of curvature have the greatest influence on wrinkling and deviation between formed and target shapes, while coefficient of friction, pin size and radius of curvature significantly affect thickness variation.