中文摘要：

基于平面应变的热弹塑性理论,分析了拉伸装夹铣削过程中应力应变的变化过程,推导了装夹初始应变和最终铣削残余应力之间的关系,并提出了一个应变叠加模型,认为如果拉伸装夹产生正的初始弹性应变,就会使残余压应力增大,否则会使残余压应力减小.开展了TC4钛合金的拉伸装夹铣削试验,铣削速度为38～566m/min,拉伸装夹产生的初始应变为0～0.003.铣削完成后,分别测量了在铣削面内与拉伸装夹方向呈0,°30,°90°和120°角的4个方向上的残余应力.试验结果表明,4个测量方向上拉伸装夹引起的残余应力变化量和产生的初始弹性应变是一致的,说明所提出的应变叠加模型是正确的.

英文摘要：

In this paper, the thermoelastoplastic theory of plane strain was adopted to analyze the variations of stress and strain in the stretching-fixation milling process and to reveal the relationship between the initial strain and the residual stress. Then, a strain superposition model was proposed, which recognized the increase in residual compressive stress only when the stretching fixation produced positive initial strain. Moreover, the stretching-fixation milling of TC4 titanium alloy was performed at a milling speed of 38 - 566 m/min and an initial strain of 0 - 0. 003. Finally, the residual stresses on the machined surface were measured in the directions of 0, 30, 90 and 120 degrees from the stretching direction, respectively. Experimental results indicate that the variations of the residual stresses measured in the four directions are consistent with the initial elastic strains, thus demonstrating the correctness of the proposed strain superposition model.