高速端面铣削加工引入残余压应力场的试验研究

为研究高速铣削加工表面残余应力分布,在统计试验设计指导下,使用X射线衍射/电解抛光方法对试样表层、次表层残余应力分布进行测量,得出残余应力分布曲线经验预报公式,探讨切削参数对残余压应力场特征指标的影响规律。研究结果表明,合理的高速切削工艺将在加工表面内引入类似喷丸强化效果的残余压应力场;(3,1)有理式模型与三阶多项式模型是描述高速铣削引入残余应力分布曲线的有效拟合公式;高速切削工艺参数对加工表面残余应力场的产生有直接影响,每齿进给量是决定残余压应力分布的关键因素,每齿进给量的变化将引起残余应力场形成机理的改变。

Experimental Analysis on Compressive Residual Stress Distribution Induced by High Speed Face-Milling Processes

The residual stress distribution beneath wokepiece surfaces machined by high speed milling process was investigated,tests of face milling were conducted in the frame of a factorial design and X-ray diffraction analysis of specimens was performed to obtain the residual stress distribution by electro-polishing method.The influences of cutting parameters on characteristics of the compressive stress distribution were studied according the regression predictive models fitting from residual stress distributions measured in tests.It is shown that high speed milling can induce a compressive stress distribution below the machined surface.A Cubic/Linear rational model and a third-degree polynomial model are effective for fitting of the compressive stress distribution.The level of compressive residual stresses depends on the cutting parameters used in tests and feed per tooth is the decisive factor on the residual stresses distribution.