１前言丝杠是将旋转运动变为直线运动的常用传动副零件。由于其能准确地传递运动，特别是能够实现微量进给运动，所以被广泛应用在各种传动机构中。丝杠按其摩擦特征，可分为滑动丝杠、滚动丝杠和静压丝杠三大类。其中，滑动丝杠的结构比较简单，加工制造比较方便，故在传动机 1 Introduction Screw is a rotary motion into a linear motion of the common drive parts. Because of its accurate transmission of movement, especially to achieve micro-feed movement, it is widely used in a variety of transmission. Screw according to its friction characteristics, can be divided into sliding screw, rolling screw and hydrostatic screw three categories. Among them, the structure of the sliding screw is relatively simple, more convenient manufacturing, it is in the conveyor