文档介绍：冲压模具设计
说明书
设计者: 惠俊
学号:2009301241
班级:05010903班
时间:2012年9月
目录
冲压件分析·······················································2
工艺分析与工艺方案选择···········································2
拉深工艺性···················································2
翻边工艺性···················································3
分析并确定冲压工艺方案···········································3
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1. 冲压件分析
(1)冲压件的精度等级为8级,模具精度选为IT6级以保证冲压件的精度要求。
(2)冲压件形状如图1,形状简单,便于排样、废料少。图1 工件图
(3)内孔为光滑圆孔,外形无尖锐清角,对冲裁的凸模和凹模无不利影响。因
此外形可以一次冲裁。模具的凸模和凹模可以是整体式,也可以是镶拼式。
(4)【1】表2—3知不属于小孔冲裁,冲孔凸模不
必采用护套结构。
拉深工艺性
(1)极限拉深系数工件的材料为LY21M,查【2】表4—10可知极限拉深
系数为,工件的拉伸系数m=dD=6685=,大于极限拉伸系数,故可通过一次拉
深使工件成形。
(2)板料相对厚度t/D0 =,相对厚度大,不易引起失
稳起皱,从而减小压边力,减小由压边力引起的摩擦,减小筒壁的拉应力,提
高了拉伸性能。
翻边工艺性
(3)翻边系数选取翻边高度为h=8mm,则预冲孔直径
d=D+-2h=66+*2-2*8=,
翻边系数m=d/D==。查【2】表5—,
因此可以一次翻边成形。
3. 分析并确定冲压工艺方案
冲压件工艺性表明,冲压件的工序有落料、拉深、冲孔、翻边。还得从排样、
模具方面进一步对工序进行考察,是否需要增加或改变工数。
模具对工序的要求
从工序件在模具中的定位来看,工件自身带的孔Ф66可以用来实现导正定位,毛料初始定位可用导料板和挡料销来实现定位。因此,没有必要增加辅助工序。
基本工序链
如果对落料、拉深、冲孔、翻边四个基本工序进行排序,可以有24种不同顺序的工序链,但冲孔必须在翻边之前,拉深也必须在冲孔之前。由此产生如下四种基本工序链:
落料——拉深——冲孔——翻边
拉深——落料——冲孔——翻边
拉深——冲孔——落料——翻边
拉深——冲孔——翻边——落料