基于评分函数的汽车不锈钢板件冲压工艺优化

Stamping process optimization on automobile stainless steel plate based on scoring function

以一种汽车用不锈钢板件为研究对象,考虑到生产效率和成本问题,设计了一种一模双件冲压工艺,同时为提高板件成形质量、降低冲压力,采用数值模拟技术对不锈钢板件的冲压成形过程进行了研究。以板件的最小厚度、最大厚度以及最大冲压力为考察指标,建立了评分函数,对整体压边定压边力方式、分区压边定压边力方式以及分区压边变压边力方式的成形效果进行了比较。结果表明:整体压边定压边力方式存在较大的拉裂和起皱风险,且无法获得符合尺寸要求的板件,而分区压边方式能有效避免拉裂和起皱风险,且变压边力的加载方式更好,成形中需要的冲压力也更小。最后,采用分区压边变压边力方式进行了不锈钢板件的成形试验,获得了无拉裂、起皱等缺陷的板件,验证了工艺的有效性。

For a stainless steel plate for automobile,considering the problems of production efficiency and cost,a stamping process of onedie producing two-piece was designed,and in order to improve the forming quality and reduce the stamping force,the stamping process of stainless steel plate was studied by numerical simulation technology.Then,taking the minimum thickness,the maximum thickness and the maximum stamping force of plate as the inspection indexes,the scoring function was established,and the forming effects of integral blank holder with constant blank holder force,zonal blank holder with constant blank holder force and zonal blank holder with variable blank holder force were compared.The results show that the integral blank holder with constant blank holder force mode has a greater risk of cracking and wrinkling,and cannot obtain the plate that meets the size requirements,while the zonal blank holder mode can effectively avoid the risk of cracking and wrinkling,and the variable blank holder force loading mode is better which requires a smaller stamping force in the forming.Finally,the forming test of stainless steel plate was carried out by using zonal blank holder with variable blank holder force mode,and the plate without defects such as cracking and wrinkling was obtained to verify the effectiveness of the process.