Abstract: To construct the mathematical model of surface residual stress after polishing,the polishing force and polishing temperature were measured by experiments and the contact arc length was calculated by time length of polishing force.Considering mechanical effect,thermal effect and thermo-mechanical coupling effect,a surface residual stress model was established in the process of polishing aero-engine blades with abrasive cloth wheel.The model coefficients indicated that the polishing force would lead to residual compressive stress on workpiece surface,both polishing heat and thermo-mechanical coupling effect would lead to residual tensile stress.The accuracy of the model was verified by experiments,which showed the predictive results were in good agreement with the experimental results.

Key words: residual stress, polishing force, polishing temperature, contact arc length, mechanical effect, thermal effect, thermal-mechanical coupling effect

摘要： 为了建立抛光后表面残余应力的数学模型,通过实验测量了百叶轮抛光航空发动机叶片过程的抛光力和抛光温度,并根据抛光力的持续时间求得接触弧长。考虑机械效应、热效应和力热耦合效应,建立了该抛光过程中的表面残余应力模型。模型系数表明,抛光力会导致工件表面产生残余压应力,热效应和力热耦合效应均会导致残余拉应力。通过实验验证了模型的准确性,而且预测结果与实验结果的一致性较好。

关键词: 残余应力, 抛光力, 抛光温度, 接触弧长, 机械效应, 热效应, 力热耦合效应