Ultra-precision machining method for raceway in guide rail

Abstract

An ultra-precision machining method for a raceway in a guide rail includes the following steps that firstly, the guide rail to be machined is fixed; secondly, a grinding belt with a certain width is pressed in the raceway and makes contact with the surface of the raceway, the grinding belt is moved at a constant speed in the raceway, the grinding belt is pulled in a reciprocating mode while being moved, and the grinding direction of the grinding belt is perpendicular to the moving direction of the grinding belt; thirdly, in the second step, the external contour shape of the grinding belt is identical to the contour shape of the raceway, and the grinding belt is closely attached to the raceway; fourthly, the grinding belt makes elastic contact with the raceway in the second step; and fifthly, the grinding belt makes contact with the middle region of the raceway in the third step, wherein the contact area is 80%-90%. The grinding belt can be an abrasive belt and can also be a cotton belt with grinding agents.

Description

technical field [0001] The invention relates to the technical field of guide rail processing, in particular to a superfinishing method for a raceway in a guide rail. Background technique [0002] At present, the linear rolling guide pair is mainly assembled by a combination of guide rails, sliders, and steel balls. At present, the processing technology of the linear rolling guide is roughly that after the material is heat-treated, the guide rail is rough and finely ground on the upper and lower planes on the surface grinder. Then install the guide rail on the high-precision guide rail grinding machine for rough and precise grinding of the guide rail raceway until it is completed. [0003] Usually the raceway is formed by grinding (such as figure 1 As shown), most of its grinding wheels are usually shaped and trimmed by diamond rollers, and some of them are trimmed by CNC interpolation with butterfly diamond rollers. This grinding method has the following disadvantages: 1. ...

AI Technical Summary

Problems solved by technology

[0003] Usually the raceway is formed by grinding (such as figure 1 As shown), most of its grinding wheels are generally shaped and trimmed by diamond rollers, and some of them are trimmed by CNC interpolation with butterfly diamond rollers. This grinding method has the following disadvantages: 1. Due to the use of forming grinding technology, the The arc profile is limited by the profile accuracy of the grinding wheel. After the profile of the grinding wheel is deformed, the profile of the raceway will be deformed. After a long grinding time, the profile of the grinding wheel will gradually deform, so it is not very ideal; 2. The surface of the grinding wheel is On the uneven surface of the sand mold, the direction of rotation of the grinding wheel is parallel to the direction of movement of the guide rail, so there are always some irregular ripples on the surface of the raceway (such as figure 2 , 3 3. The outer circumference of the grinding wheel is an arc-shaped surface, the guide rail is a linear surface, and the grinding wheel and the surface of the guide rail are in line contact. Therefore, vibration or dynamic balance of the grinding wheel will cause grinding chatter marks and affect the Processing quality

[0005] It will cause high noise and severe wear caused by local stress during use, often resulting in low motion accuracy and low service life. Therefore, affected by processing technology, it is difficult to improve the accuracy of the current guide rail to another level.

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