丝杠刚度受支撑方式影响的变化规律研究

Variation rule study on the influence of fixed supporting type to axial rigidity of screw rod

滚珠丝杠螺母传动机构是机床的进给传动部件,其轴向刚度直接影响机床的定位精度,应用变形协调原理给出了滚珠丝杠螺母传动机构的轴向刚度计算方法。计算结果显示两端固定支撑的丝杠的轴向刚度随长度按抛物线规律变化,其变形最大值在丝杠的中点。

Balle screw nut transmission is feed transmission part of machine tool, its axial stiffness may directly affect positioning precision of machine tool. The calculation of the axial rigidity for the ball screw nut transmission mechanism using deformation compatibility principle was discussed, the result shows that the axial rigidity of the ball screw is variable according to parabola rider and its maximum variational figure is at the midpoint of screw rod.