聚酰亚胺薄膜冲裁成型模设计与制造

Design and manufacturing of the punching and forming die for polyimide film

针对聚酰亚胺薄膜冲裁加工中废品率高、效率低、模具寿命短的问题,对现有模具结构和冲裁过程模具刃口受力情况进行分析,指出用斜刃冲裁模加工聚酰亚胺薄膜的弊病和不足。根据压辊冲裁机理,重新设计、制造了一套在普通压力机上实现无间隙冲裁的新型模具。用软质上模与硬质下模相互啃切形成无间隙配合,用有滚珠导向结构的精密模架和能够自动调整对中的单球面浮动模柄,弥补冲床滑块与工作台面不平行对模具寿命的影响。生产实践证明,此模具设计方案和制造方法简单可行,降低了模具加工难度、缩短了制造周期;加工了0.04 mm的聚酰亚胺薄膜,冲切断面平整、无毛刺,尺寸符合图纸要求,适于批量化生产。

In response to the problems of high scrap rate,low efficiency,and short mold life in the punching process of polyimide film,an analysis is conducted on the existing mold structure and the force on the mold edge during the punching process.The drawbacks and shortcomings of using oblique edge punching molds to process polyimide film are pointed out.Based on the punching mechanism of the pressure roller,a new type of mold has been redesigned and manufactured to achieve seamless punching on a regular press.Using a soft upper mold and a hard lower mold to gnaw and cut each other without gaps,a precision mold base with a ball guide structure and a single spherical floating mold handle that can automatically adjust the alignment are used to compensate for the impact of non parallelism between the press slider and the worktable on the mold life.Production practice has proven that this mold design scheme and manufacturing method are simple and feasible,and have been recognized by the mold manufacturer,reducing the difficulty of mold processing and shortening the manufacturing cycle;The punching section of 0.04 mm polyimide film is flat,without burrs,and the size meets the requirements of the drawing,making it suitable for mass production.