拉压组合法消减铝合金环形件淬火残余应力研究  

Research on reduction of quenching residual stress for aluminum alloy ring by combination of tension and compression method

作　　者：王并乡 易幼平[1] 崔金栋[1] 黄始全[1] WANG Bingxiang YI Youping CUI Jindong HUANG Shiquan(State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China)

机构地区：[1]中南大学机电工程学院,高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2016年第10期3381-3385,共5页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划(973计划)项目(2012CB619504);国家重点实验室基金资助项目(zzyjkt2014-02)~~

摘　　要：针对环形件淬火残余应力突出的问题,提出一种消减淬火残余应力的新方法即拉压组合法。该方法通过沿环形件内侧45°方向施加压力,同时产生拉伸和压缩的效果。利用ABAQUS有限元软件对7085铝合金环形件淬火残余应力及拉压组合法进行数值仿真。进行拉压组合法消减铝合金环形件淬火残余应力工艺实验,采用环形件切口法来表征环形件应力的变化。研究结果表明:环形件淬火残余应力主要表现为集中在截面芯部区域的周向拉应力,最大值为46 MPa;当高度方向变形量为0.6%时,芯部残余应力降至10 MPa左右;随着压下量增加,芯部残余应力由拉应力变为压应力;施加0.6%变形量的环件切口由淬火时内缩2.26 mm变为张开0.34 mm,实验结果与仿真结果一致。Aiming at the prominent issue of quenching residual stress in ring, a new method for reduction of residual stress named combination of tension and compression method was proposed. The method produced tension and compression through exerting pressure along the inside of the ring in the direction of 45°. ABAQUS finite element software was used to predict quenching residual stresses of 7085 aluminum alloy ring and combination of tension and compression method for the numerical simulation. The experiments of quenching and combination of tension and compression processes for aluminum alloy ring were performed and the ring slitting method was used to test and analyze the residual stress. The results show that the residual stresses of the ring are mainly on the center of cross section with the maximum value 46 MPa. On the condition of 0.6% deformation on the height direction, the residual stress residual stress deceases to about 10 MPa. Residual stresses convert from compress-stresses to tension-stresses with the increase of deformation. The change in the distance between the scribed points is-2.26 mm after quenching, while it is 0.34 mm with 0.6% deformation. The experimental results agree well with the simulation results.

关 键 词：环形件 淬火残余应力 拉压组合法 环件切口法 

分 类 号：TB31[一般工业技术—材料科学与工程]