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Superfinishing Analysis of Convexity of Inner Ring Raceway of Tapered Roller Bearing

wallpapers Tech 2020-06-10
Tapered roller bearing ring working surface with a crown is one of the ways to improve its service life, has become the development direction of this type of bearing. At present, reliable experience has been obtained in the crown forming of the ring grinding process ("bearing" in the 10th issue of 1996 and the 10th issue of 1999 have been reported). While using the existing bearing ring raceway superfinishing machine to realize the superfinishing of the convex raceway, it has become the key to the comprehensive application of the curved raceway machining technology.
 
At present, a considerable number of raceway superfinishing machines used by the manufacturers all adopt the method of the end face positioning drive, hydraulic centring support, large reciprocation, small oscillation, and two-step method to super finish the bearing ring raceway.
 
The practice has proved that this type of super-finishing has a specific improvement in the quality of the working surface of the bearing raceway. For example, the residual stress layer left on the surface of the raceway after grinding is removed to improve the roughness of the raceway surface and reduce the waviness. Get a higher roundness value. However, due to the limitations of its processing method this type of lapping method will cause a 1 to 2 μm deep depression in the raceway working surface (actual measured value after lap processing of 567205EΠ02 ferrule). After assembly, the two ends of the roller are in contact with the raceway, resulting in more concentrated stress at both ends of the prime raceway line, resulting in premature fatigue failure of the raceway and thereby shortening the service life of the bearing.
 
From the analysis of the working mechanism of this type of superfinishing machine, it can be known that when the whetstone reciprocates the raceway surface of the raceway, the size of the ferrule limits the travel of the sharpener. Large, forming a mutual Δα angle, and in the subsequent reciprocating motion, the element line of the whetstone working surface and the raceway working surface is not a set of parallel lines. The mutual Δα angle is the cause of the depression of the raceway surface.
 
The higher the pressure P, the more obvious the phenomenon of grind. Therefore, the lapping method of this type of equipment cannot achieve the lapping process of the convex raceway (the raceway has been ground out of the convexity). Using this method of lapping will inevitably destroy the original crown on the raceway. If the process of forming whetstone is used on such equipment, there is also a change in the shape of the sharpener that causes the raceway crown shape to change with it and the discharge of whetstone chips and metal chips is not easy. "Sintering" on the whetstone working surface reduces the grinding ability of the whetstone.
 
However, the convexity of the raceway working surface has become a general trend. How to use the existing superfinishing machine to realize the superfinishing process of the convex raceway. In this regard, the necessary improvements have been made to the 3MZ336S automatic roller bearing inner ring raceway superfinishing machine and achieved super-finishing processing of the inner ring crown raceway that has been ground. The refined products are tested by XZ200 shape measuring instrument, and they all get an excellent symmetric convex shape. At present, the improved use effect is still under verification.Superfinishing Analysis of Convexity of Inner Ring Raceway of Tapered Roller Bearing
 
Tapered roller bearing ring working surface with a crown is one of the ways to improve its service life, has become the development direction of this type of bearing. At present, reliable experience has been obtained in the crown forming of the ring grinding process ("bearing" in the 10th issue of 1996 and the 10th issue of 1999 have been reported). While using the existing bearing ring raceway superfinishing machine to realize the superfinishing of the convex raceway, it has become the key to the comprehensive application of the curved raceway machining technology.
 
At present, a considerable number of raceway superfinishing machines used by the manufacturers all adopt the method of the end face positioning drive, hydraulic centring support, large reciprocation, small oscillation, and two-step method to super finish the bearing ring raceway.
 
The practice has proved that this type of super-finishing has a specific improvement in the quality of the working surface of the bearing raceway. For example, the residual stress layer left on the surface of the raceway after grinding is removed to improve the roughness of the raceway surface and reduce the waviness. Get a higher roundness value. However, due to the limitations of its processing method this type of lapping method will cause a 1 to 2 μm deep depression in the raceway working surface (actual measured value after lap processing of 567205EΠ02 ferrule). After assembly, the two ends of the roller are in contact with the raceway, resulting in more concentrated stress at both ends of the prime raceway line, resulting in premature fatigue failure of the raceway and thereby shortening the service life of the bearing.
 
From the analysis of the working mechanism of this type of superfinishing machine, it can be known that when the whetstone reciprocates the raceway surface of the raceway, the size of the ferrule limits the travel of the sharpener. Large, forming a mutual Δα angle, and in the subsequent reciprocating motion, the element line of the whetstone working surface and the raceway working surface is not a set of parallel lines. The mutual Δα angle is the cause of the depression of the raceway surface.
 
The higher the pressure P, the more obvious the phenomenon of grind. Therefore, the lapping method of this type of equipment cannot achieve the lapping process of the convex raceway (the raceway has been ground out of the convexity). Using this method of lapping will inevitably destroy the original crown on the raceway. If the process of forming whetstone is used on such equipment, there is also a change in the shape of the sharpener that causes the raceway crown shape to change with it and the discharge of whetstone chips and metal chips is not easy. "Sintering" on the whetstone working surface reduces the grinding ability of the whetstone.
 
However, the convexity of the raceway working surface has become a general trend. How to use the existing superfinishing machine to realize the superfinishing process of the convex raceway. In this regard, the necessary improvements have been made to the 3MZ336S automatic roller bearing inner ring raceway superfinishing machine and achieved super-finishing processing of the inner ring crown raceway that has been ground. The refined products are tested by XZ200 shape measuring instrument, and they all get an excellent symmetric convex shape. At present, the improved use effect is still under verification.

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