Disc Type Special Machine guide rails lay a solid foundation for the realization of machine tool functions. The rolling body guide composed of plane guide, linear guide, circulating guide and plane guide are widely used. The precision and performance of the guide rail directly affect the machining accuracy, bearing capacity, service life and servo system performance of the machine tool. Therefore, the guide rail requirements of online guide CNC machine tools are as follows.

1. High guidance accuracy

The accuracy of guidance is the guarantee of the precise motion trajectory of parts. Guide rail accuracy Receive guide rail structure shape, combination mode, manufacturing accuracy and guide rail clearance adjustment.

2, good wear resistance

Good wear resistance, can maintain the guide accuracy for a long time, extend the service life. The wear resistance is affected by factors such as material, hardness, lubrication and load.

3, enough rigidity

The guide rail must have sufficient stiffness to ensure that there will be no excessive deformation during the stress, so as to ensure the relative position and guidance accuracy between the components. The structure and dimension of guide rail affect the stiffness.

4. Low stationary motion

Because the moving parts move at low speed on the guide rail, it is easy to produce "crawling" phenomenon, resulting in an increase in the surface roughness value of the machined surface, so the guide rail is required to move smoothly at low speed. Friction characteristics, lubrication conditions and transmission system stiffness are the main factors affecting the smoothness of low speed motion

5, good technology

The guide rail has the advantages of simple structure, economical technology and convenient manufacturing, assembly, debugging and maintenance. In order to prevent low-speed crawling, it is required to have a certain guiding accuracy, motion accuracy and positioning accuracy, and CNC machine tools generally use guideway pairs with small friction coefficient, small difference in dynamic and static friction forces, and flexible movement. According to the working characteristics and surface friction characteristics of the guide rail, it can be divided into plastic guide rail, rolling guide rail and static pressure guide rail.

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