In various precision linear guide of indicators, geometric accuracy and precision of the guide rails more important.

The geometric accuracy of the guide rail includes the straightness of the guide rail between the vertical plane and the horizontal plane, the parallelism between the guide rail surfaces and the perpendicularity between the guide rails; the guiding accuracy of the guide rail refers to the movement trajectory of the moving parts and the given direction. deviation. It mainly depends on the geometric accuracy of the guide rail itself and the guide rail fitting clearance, where the guide rail fitting clearance mainly depends on the structural type of the guide rail, surface roughness, the stiffness of the guide rail and the influence of thermal deformation.

The main factors affecting the accuracy of the guide rail are as follows:

  1. The straightness of the guide rail: directly affects the parallelism of the guide rail surface and the perpendicularity between the guide rails
  2. Guide rail stiffness: the guide rail will produce contact deformation, local deformation and self-deformation due to force. Contact deformation is caused by the microscopic unevenness of the guide rail plane; local deformation generally occurs where stress is concentrated; the deformation of the guide rail itself refers to the overall deformation of the guide rail under the action of external load, and is related to the material and layout of the guide rail.
  3. The surface roughness of the guide rail: mainly depends on the material, hardness and grinding process of the guide rail.
  4. The structure of the guide rail: it directly affects the positioning accuracy and repeat positioning accuracy of the machine tool.

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