落料拉深冲孔复合模具设计说明书

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1、西北工业大学落料拉深冲孔复合模具设计说明书设计者：王兆义学号：2009301273指导教师：张贤杰班级：05010904时间：2012-9-2719西北工业大学目录1.零件冲压工艺分析······································31.1制件介绍···········································31.2产品结构形状分析···································41.3产品尺寸精度、粗糙度、断面质量分析··········

2、·········42.零件冲压工艺方案的确定·····························42.1冲压方案···········································52.2各工艺方案特点分析································519西北工业大学2.3工艺方案的确定·····································53.冲模结构的确定········································53.1模

3、具的结构形式·····································53.2模具结构的选择·····································64.零件冲压工艺计算······································64.1零件毛坯尺寸计算···································64.2排样···············································74.319西北工业大学拉深工序的拉深

4、次数和拉深系数的确定·················84.4冲裁力、拉伸力的计算································84.5拉伸间隙的计算·····································94.7计算模具刃口尺寸··································105.模具结构设计与相关校核·····························115.1模架的设计······································

5、··115.2冲孔凸模结构设计与校核···························135.3冲孔凹模的结构设计································145.419西北工业大学落料凸模结构设计··································155.5落料凹模结构设计··································166模具结构简图·······································16参考文献············

6、·································1719西北工业大学1.零件冲压工艺分析1.1制件介绍零件名称：底材料：20-81厚度：t=1.75mm批量：大批量零件如下图：19西北工业大学图11.2产品结构形状分析图1产品结构形状分析由图1可知，产品为圆片落料、无凸缘筒形件拉深、圆片冲孔，产品结构简单对称，中间孔孔壁与制件直壁之间的距离较远，直接冲孔不会影响零件外形。然而周边六孔孔壁余制件直壁之间的距离L不满足L≥(R+0.5t)要求。因此，对这六个孔得加工不能在模具上加工，而是要采取另外的

7、钻孔来完成。(R为之间拉深圆角半径值取3;t为零件材料厚度值取1.75)1.3产品尺寸精度、粗糙度、断面质量分析（1）尺寸精度零件的标注公差均为给定，故默认零件精度为IT14级。一般的冲压均能满足要求，模具的精度要求应为IT11级。（2）冲裁剪断面质量板料厚度1.75，查【2】第44页表3-4，生产时毛刺允许高度为≤0.15，本产品在断面质量和毛刺高度上没有严格的要求，所以只要模具精度达到一定要求，冲裁件的断面质量可以保证。（3）产品材料分析对于冲裁件材料一般要求的力学性能时强度低，塑性高，表面质量和厚度公差复合

8、国家标准。本设计零件所采用的材料是20钢，为低碳钢材料，其力学性能是强度、硬度和塑性指标适中，用冲裁的加工方法是完全可以成形的。另外零件对于厚度和表面质量没有严格要求，所以采用国家标准的板材，其冲裁出的零件的表面质量和厚度公差就可以保证。（4）生产批量产品生产批量为大批量生产，适于采用冲压加工的放大，最好是采用复合模，这样将很大地提高生产效率，降低生产成本。2.零件冲压工