u形弯曲件模设计说明书

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1、河南职业技术学院模具设计与制造专业冷冲压专业课程设计说明书课　题：四角形弯曲件院系：机电系班级：模具112专业：模具设计与制造姓名：赵新亚学号：11116080指导教师：鲁子亮目录第一章工艺方案拟定·······································61.1材料分析··········································61.2结构分析··········································61.3毛坯展开·······························

2、···········61.4方案确定··········································8第二章弯曲工艺计算········································72.1冲压力计算·········································72.2模具工作部分尺寸计算······························9第三章模具总结构形式确定·······························8第四章冲压设备的选择·················

3、·················12第五章弯曲模模架及零件设计·····························125.1后侧导柱模架的选用································135.2其它零件结构······································13第六章模具制造工艺过程·································136.1凹模制造工艺过程·································16.1凸模制造工艺过程·················

4、················16第七章模具各部分零件参数·····························16第八章橡胶垫的选用···································17第九章总装配及零件图·······································18小结·················································19参考文献·············································22题目：四角形弯曲件成形工艺及模

5、具设计图纸:技术要求：零件无毛刺，按IT14级。材料:08F钢料厚:1mm板宽25mm.设计资料(数据)及要求:1、图纸2、材料3、批量4、公差均见图示设计要求：1、绘制主要零件图；2、编制零件工艺规程；3、绘制模具总装图和非标准零件图；4、编写设计计算说明书。第一章工艺方案拟定1.1、材料分析该工件所用材料08F钢是常用的冲压材料，塑性较好,适合冲压加工查表得：抗拉强度=300Mpa，屈服强度=180Mpa。1.2、结构分析该工件结构简单，形状对称，适合弯曲。工件弯曲半径为1mm,查表3.1（垂直于纤维），查表rmin=0.2t=0.2mm，即能

6、一次弯曲成功。工件的弯曲直边高度为9-1-1=7mm，大于2t，因此可以弯曲成功。该工件是一个弯曲角度为90o的弯曲件，所有尺寸精度均未标注公差，而当r/t<5时，可以不考虑圆角半径的回弹，所以该工件符合普通弯曲的经济精度要求。该工件的弯曲工艺性良好，适合进行弯曲加工。1.3、毛坯展开。如图所示毛坯总长度L=6*2+38+14.5*2=79mm由表1可得：r/t=1则x=0.32，可以看出中性层的位移情况r/t0.10,20.30.4o.50.60.70.81.01.2x0.210.220.230.230.250.260.280.300.320.3

7、3r/t1.31.52.02.53.04.05.06.07.0≥8.0x0.340.360.380.390.400.420.440.46.0480.50表11.4、方案确定。由图1分析看出，该产品需要的基本冲压工序为冲孔、弯曲。根据上述分析该零件上的孔与弯曲边的距离很大，所以弯曲时不会引起孔变形，因此可以先冲孔再弯曲，所以生产该产品的工艺方案为先用级进模冲孔，再用弯曲模弯曲。二、弯曲工艺计算。2,1、冲压力的计算。（1）弯曲力的计算。弯曲力的大小不仅与毛坯尺寸、材料的力学性能、凹模支点间的间距、弯曲半径及凸凹模间隙等因素有关，而且与弯曲方法也有很大

8、的关系。生产中常用经验公式进行计算。1)弯曲力由式FZ=0.7Kbt2σb/r+t得FZ=0.7Kbt2σb/r+t=0.