叠层金属薄板材料的冲裁特性研究  

Research on the Characteristics of Multi-layer Sheet Metal Blanking

作　　者：槐建明[1] 樊瑜瑾[1] 郭波江[1] 

机构地区：[1]昆明理工大学机电工程学院,云南昆明650093

出　　处：《新技术新工艺》2012年第9期55-58,共4页New Technology & New Process

基　　金：科技部科技人员服务企业资助项目(2009GJF30012)

摘　　要：在冲裁分离过程中,单层与叠层金属板材存在很大的差异。通过对比2者的不同特点,选取并分析微元体的应力应变状态,发现在叠层冲裁过程中,变形区内中间层的材料处在3向压应力状态,表现出很强的可塑性。分析冲裁中各因素对应力状态的影响发现,合理地减小凸模与凹模的间隙可以提高变形区的静水压,抑制裂纹的产生,使冲裁过程控制在塑剪变形阶段。以叠层母线冲孔为例来验证理论分析,试验结果与分析一致,叠层冲裁比同厚度单层冲裁所要求的模具间隙更小,其值取在普通冲裁间隙经验公式的基础上乘以0.4左右的修正系数为宜。There are lots of differences between single-layer metal plate and multiqayer sheet metal in blanking. By comparing those differences, this paper analyzed the stress-strain state of the element found in the deformation region of blanking, and then pointed out that the middle layers of multi-layer sheet are in the three-stress state, showing great plasticity. According to the characteristics an experiment has proposed, through decreasing the clearance between punch and die rea- sonably, the hydrostatic pressure can be improved in the deforming zone and the cracks can he restrained, so the blanking is deformed in the plastic shear, in order to improve the blanking quality. Further, taking the multi-layer Bus punching experi- ment to confirm the theory, we get the consistent conclusion that multi-layer sheet metal blanking is required smaller clearance than the same thickness of single-layer metal plate. In order to get better blanking quality, a correction factor about 0. 4 should multiply the formula of blanking clearance to determine the multiqayer sheet metal blanking clearance.

关 键 词：冲裁 叠层板材 应力分析 冲模间隙 表面质量 

分 类 号：TG38[金属学及工艺—金属压力加工]