• CN:11-2187/TH
  • ISSN:0577-6686

›› 2011, Vol. 47 ›› Issue (24): 57-62.

• 论文 • 上一篇    下一篇

7075铝合金板预拉伸工艺研究

朱才朝;罗家元;李大峰;丁华峰;钟渝   

  1. 重庆大学机械传动国家重点实验室;中国汽车工程研究院股份有限公司;西南铝业(集团)有限责任公司
  • 发布日期:2011-12-20

Numerical Simulation and Experimental Investigation of the Aluminium Alloy Quenching Process by Considering the Flow Stress Characteristic

ZHU Caichao;LUO Jiayuan;LI Dafeng;DING Huafeng; ZHONG Yu   

  1. State Key Laboratory of Mechanical Transmission, Chongqing University China Automotive Engineering Research Institute Co., Ltd. Southwest Aluminum (Group) Co., Ltd.
  • Published:2011-12-20

摘要: 采用直接热力耦合的方法,引入7075铝合金高温下的流变应力特征曲线,对不同厚度的7075铝合金板材在实际淬火工艺下的淬火过程进行数值模拟,揭示铝合金板材淬火残余应力分布规律;考虑铝合金板材拉伸过程中的实际夹持方式,对不同厚度7075铝合金板材实际拉伸过程进行数值模拟,分析对比拉伸后残余应力分布规律,并对拉伸工艺进行优化,确定最佳拉伸率和锯切量,揭示厚度变化对淬火残余应力、拉伸后残余应力以及锯切量的影响规律。利用钻孔法对实际拉伸的7075铝合金板材进行拉伸后残余应力的试验测试,数值模拟结果与试验测试结果相吻合。研究结果表明,随着厚度的增加,淬火残余应力、最佳拉伸率以及锯切量都相应增大,锯切量中过渡区长度为板材厚度的60%~70%。

关键词: 残余应力, 淬火, 厚度变化, 锯切量, 预拉伸

Abstract: By introducing the flow stress curve, the numerical simulation of stress redistribution during the quenching process for 7075 aluminum alloy plates with different thickness is performed using a direct thermo-mechanical coupled method. Considering the practical clamping, the stretching simulation of 7075 aluminum alloy sheets with different thickness is conducted to analyze the residual stress distribution. Also, the pre-stretching process is optimized to determine the stretch rate and the amount of cutting. Through the analysis, the influences of thickness variation on quenching-induced residual stresses, stretching residual stresses and the amount of cutting are investigated. A practical experiment was conducted to demonstrate the quenching-induced residual stresses distribution using a blind hole measuring method. The result which compares well with the simulation shows that the quenching-induced residual stress, stretch rate and the amount of cutting are increased as the aluminium alloy plate becomes thicker. The length of transition zone is about 60%~70 % of the thickness.

Key words: Amount of cutting, Pre-stretching, Quenching, Residual stress, Thickness variation

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