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在机床微机控制改造中,运动导轨的摩擦系数大小是一个重要因素。如驱动源为步进电机或液压扭矩放大器,则对运动导轨摩擦系数要求更高。因为机床的导轨通常采用滑动导轨,它的动、静摩擦系数均较大,因而在导轨运动速度较低的情况下便出现低速爬行现象,在运动呈脉冲式进给的情况下尤为明显,影响了工作的精度和表面粗糙度。而选用新的导轨结构,则耗资较大,费时较长。为此,作者给合本厂设备改造实际,设计了一种滚动导轨,能满足在较低进给速度时不产生爬行的要求,简介如下。一、结构设计该设计是在机床燕尾导轨的基础上作些改动,增加几个零件,取消了楔铁代之以滚柱,使滑动摩擦变
In the computer control transformation, the friction coefficient of the motion guide rail is an important factor. If the driving source is a stepping motor or a hydraulic torque amplifier, the friction coefficient of the guide rail is more demanding. Because the guide rail of the machine tool usually adopts the sliding guide rail, its dynamic and static friction coefficients are large, so the low-speed creeping phenomenon occurs when the guide rail is moving at a low speed, especially when the movement is in the form of pulsed feeding, affecting Work accuracy and surface roughness. The use of new rail structure, the cost of larger, longer time-consuming. To this end, the author to the factory transformation of the actual design of a rolling guide to meet the lower feed rate does not produce crawling requirements are as follows. First, the structural design The design is done on the basis of the dovetail rail machine to make some changes to increase the number of parts, eliminating the wedge iron instead of the roller so that sliding friction variable