直线导轨（linear slider）可分为：滚轮直线导轨，圆柱直线导轨，滚珠直线导轨，三种，是
用来支撑和引导运动部件，按给定的方向做往复直线运动。依按摩擦性质而定，直线运动导轨
可以分为滑动摩擦导轨、滚动摩擦导轨、弹性摩擦导轨、流体摩擦导轨等种类。
直线导轨运动的作用是用来支撑和引导运动部件，按给定的方向做往复直线运动。依按摩擦性
质而定，直线运动导轨可以分为滑动摩擦导轨、滚动摩擦导轨、弹性摩擦导轨、流体摩擦导轨
等种类。 直线轴承主要用在自动化机械上比较多,像德国进口的机床,折弯机,激光焊接机等等
,当然直线轴承和直线轴是配套用的。像直线导轨主要是用在精度要求比较高的机械结构上,直
线导轨的移动元件和固定元件之间不用中间介质，而用滚动钢球。
1、直线导轨主要用在自动化机械上比较多,像德国进口的机床,纸碗机,激光焊接机等等,当然直
线导轨和直线轴是配套用的。
2、直线导轨主要是用在精度要求比较高的机械结构上,直线导轨的移动元件和固定元件之
间不用中间介质，而用滚动钢球。因为滚动钢球适应于高速运动、摩擦系数小、灵敏度高，满
足运动部件的工作要求，如机床的刀架，拖板等。如果作用在钢球上的作用力太大，钢球经受
预加负荷时间过长，导致支架运动阻力增大。
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