论文部分内容阅读
在机械传动中,为使旋转运动变成直线运动,常需使用传动丝杆。由于滚珠丝杆具有如下优点,所以在数控等机械中得到日益广泛应用:1)滚珠丝杆摩擦力小,在同样负荷下比滑动丝杆驱动扭矩减少2/3—3/4,所以传动效率可达到90%以上;2)滚动摩擦能代替滑动摩擦,动、静摩擦系数相差小,不易产生爬行,因而灵敏度高,传动平稳;3)动摩擦力小,摩擦所引起的温升小,由温差产生的误差也小,定位精度很高,可达到1～2μm。但滚珠丝杆也有局限性:不能自锁、工艺性差、成本较高。滚珠丝杆材料通常
In mechanical transmission, in order to make rotary motion into a linear motion, it is often necessary to use a drive screw. As the ball screw has the following advantages, it is increasingly widely used in CNC machines and other machinery: 1) ball screw friction is small, in the same load than the sliding screw drive torque reduction 2 / 3-3 / 4, so the transmission efficiency Can achieve more than 90%; 2) rolling friction can replace the sliding friction, dynamic and static friction coefficient difference is small, not easy to produce crawling, and thus high sensitivity, smooth transmission; 3) dynamic friction, friction caused by small temperature rise, The error is also small, high positioning accuracy, up to 1 ~ 2μm. However, there are limitations ball screw: can not be self-locking, poor workmanship, high cost. Ball screw material usually