挤压预应力组合凹模强度分析及设计  

Strength Analysis and Design of Cold Extrusion Prestressed Combination Female Die

作　　者：敖文刚[1] 唐全波[1] 黄勇刚[1] 

机构地区：[1]重庆工商大学机械工程学院

出　　处：《特种铸造及有色合金》2013年第5期405-409,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51105397);重庆市科技攻关项目(CSTC2011AC6086);重庆市教委科学技术研究项目(KJ120716)

摘　　要：运用统一强度理论对两、三层挤压预应力组合凹模进行了等强度分析,导出了包含反映材料拉压性能差异的参数α及反映中间主应力效应的参数b的计算其强度的系列计算式,并据此编写了计算程序。通过程序作出了3组参数α、b取不同值时组合凹模强度与R/r关系的曲线,得到了参数α、b影响组合凹模强度的规律。结果表明,b的取值从0到1逐渐增大,组合凹模强度也逐渐增加,对于有明显拉压异性的合金钢,如取参数α≠1来考虑材料拉压异性,则组合凹模的强度可提高。Applying unified strength theory, two-layer prestressed combination die and the three-layer one by equal strength principle were analyzed, and series of calculation formula of the die strength containing the tension-compression ratio aand the intermediate principal stress parameter b were derived, and corresponding program was writed. By the program developed, three sets of curves about the die strength and R/r relation with different values of aand b were presented. Effects of the parameters,aand b on combination die strength were obtained. The results show that die strength is increased with in- creasing in b changed from 0 to 1. As to alloy steel with significantly different tension and compression, when , a≠lstrength of the combination die can be increased.

关 键 词：挤压组合凹模 分层半径 过盈量 等强度分析 

分 类 号：TH123.3[机械工程—机械设计及理论]