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直线导轨又称线轨、滑轨、线性导轨、线性滑轨，用于直线往复运动(http://www.maoyihang.com/sell/l_35/)场合，且可以承担一定的扭矩，可在高负载的情况下实现高精度的直线运动。在大陆称直线导轨，台湾一般称线性导轨，线性滑轨。
导向精度是指运动构件沿导轨导面运动时其运动轨迹的**程度。影响导向精度的主要因素有导轨承导面的几何精度、导轨的结构类型、导轨副的接触精度、表面粗糙度、导轨和支承件的刚度、导轨副的油膜厚度及油膜刚度，以及导轨和支承件的热变形等。
直线运动导轨的几何精度一般包括：垂直平面和水平平面内的直线度；两条导轨面间的平行度。导轨几何精度可以用导轨全长上的误差或单位长度上的误差表示。
技术要求：导轨的质量取决于它的制造精度和安装精度，设计时应根据使用要求，制定出转动导轨的若干技术条件，下列项目和数据可供参考：
两导轨面间的不平度一般为3微米；
导轨不直度一般为10-15微米，精密的小于10微米。
转动体的直径差，对于一般的导轨，全部转动体的直径差不大于2微米，每组转动体的直径差不大于1微米；对于精密导轨，全部转动体的直径差不大于1微米，每组转动体的直径差不大于0.5微米；
滚柱的锥度在滚柱长度范围内，大小端直径差小于0.5-1微米；
表面光洁度通常应刮研；在25×25厘米2内，其接触斑点为20-25个点，精密的取上限，一般的取下限。
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