Bearing seal groove forming plunge-cut grinding method

Abstract

The invention discloses a bearing seal groove forming plunge-cut grinding method. The method includes the steps: firstly, machining a seal groove of an inner ring of a bearing into a preform and reserving margins; secondly, grinding the seal groove and a roller path of the inner ring by a dressed grinding wheel; thirdly, finishing grinding. The margins in the seal groove of the inner ring are gradual margins. When the seal groove with the design of the gradual margins is used, the margins grinded by the grinding wheel are gradually increased, impact force on the grinding wheel is small, abrasion of the grinding wheel is effectively reduced, so that grinding accuracy of the seal groove is improved, the service life of the grinding wheel is prolonged, two slopes of the seal groove are designed into the gradual margins, two sides of a grinding edge of the grinding wheel uniformly bear axial force when the seal groove is grinded, collapse of the grinding edge of the grinding wheel is avoided, and the method can also avoid the problem that a margin at the bottom of a groove frequently cannot be grinded due to the defect of collapse of the grinding edge of the grinding wheel when the seal groove is grinded.

Description

technical field [0001] The invention relates to a processing method of a bearing, in particular to a forming-cutting grinding method of a sealing groove of a bearing. Background technique [0002] The quality of bearing sealing performance directly affects the service life and reliability of bearings. The main factors affecting the sealing performance of bearings are: correct design, production quality of sealing ring, processing quality of sealing groove, selection of suitable grease, etc. [0003] The processing quality of the sealing groove of the inner ring and outer ring of the sealed bearing directly affects the sealing performance of the bearing. The processing quality of the sealing groove of the bearing outer ring is not good, resulting in the sliding (slip ring) of the sealing ring relative to the outer ring of the bearing, or even falling off from the sealing groove, which is commonly referred to as the "cover drop" phenomenon, which will cause the sealed bearing...

AI Technical Summary

Problems solved by technology

[0005] Disadvantages: poor wear resistance, frequent sharpening, low dimensional accuracy

[0008] Disadvantages: high cost, generally 6-8 times that of YT15 and W2 tool steel

Low toughness, poor impact resistance

[0009] In addition to the above reasons, due to the poor rigidity and low precision of machine tools of most manufacturers, it is difficult to guarantee the size and shape of the sealing groove in turning, and the size dispersion is large. In addition, it is difficult to control the heat treatment deformation, and the oil spots on the main contact surface of the sealing groove after heat treatment , Difficult to deal with oxide skin, low roughness value and other factors make it difficult to guarantee the quality of the sealing groove

[0010] In addition, there is currently no good method for measuring the size and shape accuracy of sealing grooves in the industry. Most manufacturers with strict quality control arrange special personnel to conduct full inspections of sealing grooves, which can only focus on individual dimensions, while the accuracy of shape and roughness Sampling inspections for indicators such as these also increase the difficulty and cost of controlling the quality of the sealing groove

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