表芯盖多工位级进模设计

Multi-position Progressive Die Design for Watch-Movement Cover

【目的】避免多套单工序模造成的定位误差,设计复合模难以完成的复杂形状工件,在保证工件精度的基础上进一步提高生产效率。【方法】课题组提出了一种多工位级进模的设计方法,以表芯盖为例,从材料、结构、精度等方面对表芯盖展开分析,对其进行多工位级进模设计,设计出了表芯盖生产的首次拉深—第二次拉深—整形—冲孔—落料多工位级进模。【结果】排样方式为单排直排,步距58 mm,采用双侧刃和导正销共同定位;模具采用正装结构,实现零件和废料的自然分离;凹模按工位分别制作,利用固定板固定;拉深工位凹模内安装弹性顶件器,方便工件顶出。【结论】模具未开设空工位,极大地简化了模具结构,减小了模具整体尺寸,节约了加工成本。用多工位级进模设计的材料利用率为60%,不仅成本低,而且生产效率较高,未来能够进一步推动生产现代化、智能化发展。

[Objective]To avoid positioning errors caused by multiple sets of single process molds,design complex shaped workpieces that are difficult to complete with composite molds,and further improve production efficiency while ensuring workpiece accuracy.[Method]The research group proposed a design method for a multi-position progressive die.Taking the watch core cover as an example,it analyzed the material,structure,accuracy,and other aspects of the watch core cover,and designed a multi-position progressive die for it.We have designed a multi-position progressive die for the production of watch core covers,which includes first drawing,second drawing,shaping,punching,and blanking.[Result]The layout method is single row straight layout,with a step distance of 58 mm,and is positioned together with double-sided blades and guide pins.The mold adopts a formal structure to achieve natural separation of parts and waste.The concave mold is made according to the workstation and fixed with a fixed plate.An elastic ejector is installed in the concave mold of the deep drawing station to facilitate the ejection of the workpiece.[Conclusion]The absence of empty workstations in the mold greatly simplifies the mold structure,reduces the overall size of the mold,and saves processing costs.The material utilization rate designed with multi-station progressive molds is 60%,which not only has low cost but also high production efficiency.In the future,it can further promote the modernization and intelligent development of production.