带凸缘空心铆钉连续拉伸级进模设计

Design of Progressive Drawing Die with Flange and Hollow Rivet

空心铆钉是由0.5mm的H62薄板,经过10个工步的连续拉伸及冲孔、整形和切边加工成形。最关键的是要根据黄铜薄板厚度和最终拉伸直径及高度,经过计算以确定拉伸板材的宽度、步距、拉伸工步数量、每工步拉伸的直径、高度、凸、凹模圆角半径,再制定冲孔、整形、空位和切边等工步。该模具冲孔工步的设置,解决了空心铆钉底盖的切除,整形工步解决了空心铆钉冲孔后的整形。为了应对空心铆钉拉伸参数不到位和破裂,需要设置空位工步。为了保证黄铜板材在拉伸过程中材料顺利地流动,凸、凹模的拉伸型面与圆角半径都要研磨,粗糙度值均不低于Ra0.4μm。经过这些工步,才能加工出合格的空心铆钉。

The hollow rivet is made of 0.5mm sheets of H62 sheet, and can be processed after continuous stretching and punching, shaping and trimming after 10 steps. The most important thing is to determine the width, step distance, the number of stretching steps, the diameter,height, and the radius of the corner of the punch and matrix, according to the thickness of the brass sheet and the final drawing diameter and height, and then make the piercing, shaping,vacancy and cutting edge. The setting of the punching step of the die solves the removal of the bottom cover of the hollow rivet, and the shaping step solves the shaping of the hollow rivet after punching. In order to deal with the failure and rupture of the hollow rivet, the vacancy step is needed. In order to ensure the smooth flow of materials in the drawing process, the drawing surface and fillet radius of the punch and matrix must be lapped, and the roughness is not less than Ra0.4μm. After these steps, qualified hollow rivets can be manufactured.