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针对高速数控机床采用的大导程滚珠丝杠副对进给系统性能影响问题,考虑螺旋升角、滚珠与滚道接触面的滑动和滚动摩擦,研究了滚珠丝杠副的轴向弹性变形,利用有限元方法进行了仿真分析;建立了丝杠由转动到直线进给运动的传递效率数学模型,并利用实验进行了验证。结果表明,随着螺旋升角的增大,丝杠副的传递效率提高,轴向弹性变形减小,轴向力减小,提高了轴向定位精度。
Considering the influence of the large lead ball screw pair on the feed system performance of high-speed CNC machine tools, the axial elastic deformation of the ball screw pair was studied considering the sliding angle and the rolling friction of helix angle, ball and raceway contact surface, The finite element method is used to carry out the simulation analysis. The mathematic model of the transmission efficiency of the screw from the rotation to the linear feed motion is established and verified by experiments. The results show that with the increase of helix angle, the transmission efficiency of the screw pair increases, the axial elastic deformation decreases, the axial force decreases, and the axial positioning accuracy is improved.