螺旋锥齿轮摆辗凹模的断裂失效  

Fracture of Concave Die for Spiral Bevel Gear in the Rotary Forging Process

作　　者：李亚敏[1] 王华君[1] 汪学阳[1] 朱春东[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《锻压装备与制造技术》2009年第4期89-92,共4页China Metalforming Equipment & Manufacturing Technology

基　　金：国家科技支撑计划项目(2006BAF04B06);湖北省自然科学基金项目(2007ABA214);材料成形与模具技术国家重点实验室开放基金项目(06-5)

摘　　要：螺旋锥齿轮是差速器的核心部件,其精密模锻过程中存在角隙充填不满和成形力过大的问题。利用摆辗成形过程中金属周向流动容易的特性,可以克服这些困难。由于螺旋锥齿轮齿线长而弯曲,其摆辗成形过程中,模具经常断裂失效。本文建立了螺旋锥齿轮摆辗有限元模型,对其成形过程进行模拟;利用点跟踪的方法,对凹模齿根凸面和凹面的周向应力和径向应力进行研究;分析了凹模齿根应力和不均衡应力,得到外端凸面的应力值过大和外端不均衡应力过大是模具经常断裂失效的主要原因,提出了增加凹模齿形外端的强度是提高凹模寿命的有效方法。The FE model of spiral bevel gear in rotary forging process has been established in the text with forming process simulated.By use of point tracking method, circumferential and radial stresses on the convex surface and concave surface of the concave die addendum have been studied.The stresses and unbalanced stresses at the addendum have been analyzed. The main reasons that the die always fractures have been obtained that the stresses on convex surface and unbalanced stresses of the outside section are too large. Improving the strength at the outside section is an effective way to improve dies life in rotary forging process of spiral bevel gear.

关 键 词：机械制造 凹模 摆辗 螺旋锥齿轮 

分 类 号：TG335.19[金属学及工艺—金属压力加工]