Transactions of Materials and Heat Treatment

Title：Influence of blanking clearance on forming of multi-layer thin copper plate

Authors： Sheng Yadong Fan Yujin Jiang Chongjian

Unit： Kunming University of Science and Technology Xiang Electric Manufacturing Corporation Ltd.

KeyWords： multi-layer thin copper plate blanking clearance punching diameter fracture burr height

ClassificationCode：TG386.2

year,vol(issue):pagenumber：2020,45(3):27-36

Abstract：

A six-layer thin copper plate with single layer thickness of 0.3 mm was blanked, and the influence of blanking clearance on the forming of multi-layer thin copper plate was studied. Then, the forces and stress conditions in the blanking process of multi-layer thin copper plate were analyzed, and the blanking quality of multi-layer thin copper plate under different blanking clearances was simulated by software ABAQUS. The research shows that the maximum equivalent stress at the beginning of blanking occurs at the edge of punch and die to cause the top and bottom thin copper plates to fracture first, and the middle thin copper plate is squeezed by the adjacent layer resulting in the maximum equivalent stress at the soft edge of punch and die. Finally, it appears in the contracted section of the middle thin copper plate. With the increasing of the blanking clearance, the tensile deformation of each thin copper plate is obvious, which leads to increase the punching diameter and the burr height. However, the change of punching diameter at the first three layers of thin copper plate is relatively stable, which is close to the size of the punch, and the change of punching diameter at the last three layers of thin copper plate is relatively large, which is close to the size of the respective die. In the end, through test verification, the blanking accuracy meets the requirements of national standards. In the actual production process, selecting a reasonable and as small blanking clearance as possible can improve the blanking quality of blanking part.

Funds：

昆明理工大学分析测试基金（2017M20162103009）

盛亚栋（1993-），男，硕士研究生 E-mail：279004536@qq.com 通讯作者：樊瑜瑾（1962-），男，博士，教授，硕士研究生导师 E-mail：fanyujinkmust@163.com

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