锻压技术

挤压温度对温挤压模具载荷和应力的影响研究

英文标题：Influence research of extrusion temperature on warm extrusion die load and stress

作者：张安民

单位：泸州职业技术学院

分类号：

出版年,卷(期):页码：2014,39(7):106-112

摘要：

在生产中发现，当生产挤压壳体零件的不足200件时，多数模具因反复受载而开裂失效，而挤压温度的高低直接影响模具承受载荷和应力的情况。基于此，利用Deform仿真模拟软件及工艺试验来探讨挤压温度对模具载荷和应力的影响规律，寻找合理的挤压温度范围用以提高模具寿命。通过模拟获得温挤压时模具温度场分布图，不同温度下凸模载荷、凹模载荷与挤压行程的关系曲线图，凸模等效应力、凹模等效应力与凸模冲程的曲线关系图。采用相同的参数对壳体零件进行了实际加工，实验与模拟结果较吻合。通过分析可知：对模具材料3Cr2W8V钢进行温挤压时，挤压温度不低于700 ℃时，可以有效避免模具开裂，有效提高模具寿命。

It is found from the production site that most punches would be cracked and failed for repeated loading when squeezing shell parts less than 200. The situation of die load and stress are directly affected by extrusion temperature. Based on this, the influence laws of extrusion temperature to die load and stress were discussed using Deform and technology test, and reasonable extrusion temperature range to guide practice was put forward，which improved the die life. From the simulation，the die temperature distribution graph when warm extrusion，the relationship curves of load of punch and female die with stroke at different extrusion temperatures and the relationship curves between effective stress of punch and female die and punch stroke at different extrusion temperatures were obtained. The shell parts were processed with the same set of parameters, and the experimental results are consistent with simulation. The results show that when warm extrusion temperature is bigger than 700 ℃,the die cracking is avoided and the die life is improved for mold material of 3Cr2W8V.

基金项目：

“过程装备与控制工程四川省高校重点实验室”项目（GKZY201103）

张安民（1965-），男，硕士，副教授

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