数控立车非线性几何误差对回转支承滚道加工精度的影响

Influence of the Non-linear Geometric Errors of Vertical CNC Lathe on the Machining Precision for Turning Slewing Ring's Ball Track

应用多体运动学理论建立数控立车的几何误差模型,对数控立车车削加工回转支承滚道进行了误差分析。切削试验与误差分析表明,数控立车中的4项非线性几何误差严重影响回转支承滚道的开口和接触角,严格控制机床的4项非线性几何误差是提高回转支承滚道加工精度的基本保证。对现役数控立车来说,根据误差反向补偿原理,采用数控软件误差补偿技术是提高回转支承滚道加工精度的有效措施之一,实践证明其技术可行、效果明显。

Multi-body system theory was employed here to form the geometric error model of vertical CNC lathe and to make an analysis of the precision of the slewing ring＇s ball track turned in vertical CNC lathe. Both of the results of cutting test and analysis demonstrate that four of the nonlinear geometric errors of vertical CNC lathe greatly affect the angle contacting the ball and the opening size of the slewing ring＇s ball track. Minimizing the four errors is essential to enhance the machining precision. The application of the skill of the CNC software compensation of the geometric errors based on the rule of the reverse compensation is one of the effective measures to increase the precision.