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Eccentric ball bearing outer ring forming method for controlling distribution of metal flow lines along channels

A bearing outer ring and metal streamline technology, applied in metal processing equipment, mechanical equipment, engine components, etc., can solve the problem of reducing the contact fatigue performance of the raceway surface of the ring, and achieve grain and primary carbide refinement, Effect of increasing strain and improving contact fatigue performance

Pending Publication Date: 2022-04-29
AVIC HARBIN BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that the existing forging of bearing rings adopts the process of first free forging to make blanks, then rolling and expanding into ring parts, and finally turning out the ditch, which leads to the cutting of the metal streamline of the rings, which seriously reduces the bearing capacity of the rings. To solve the technical problems of the contact fatigue performance of the raceway surface, and provide a forming method for the outer ring of the eccentric ball bearing that controls the distribution of the metal flow line along the groove

Method used

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  • Eccentric ball bearing outer ring forming method for controlling distribution of metal flow lines along channels
  • Eccentric ball bearing outer ring forming method for controlling distribution of metal flow lines along channels
  • Eccentric ball bearing outer ring forming method for controlling distribution of metal flow lines along channels

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specific Embodiment approach 1

[0020] Specific Embodiment 1: This embodiment is a method for forming the outer ring of an eccentric ball bearing that controls the distribution of metal streamlines along the channel, such as figure 1 As shown, the method flow is: upsetting, punching-rolling forming metal flow line distribution along the channel of the eccentric bearing outer ring-ash buried cooling-spheroidizing annealing treatment, turning, grinding and superfinishing, the specific process is as follows :

[0021] 1. Heat the bar material with an aspect ratio of 1.6 to 2.5 at 1000°C to 1150°C for 0.9h to 1.2h, and then perform an upsetting process with an upset ratio of 1.8 to 2.8;

[0022] The formation of metal flow lines is closely related to the whole process of upsetting, punching and rolling, and it is gradually formed in each process and has heredity. Therefore, it is necessary to control the metal flow line during the forging process to make it reasonably distributed. The metal streamline directio...

specific Embodiment approach 2

[0032] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, the bar with an aspect ratio of 1.75 is kept at 1000° C. to 1150° C. for 0.9 h to 1.2 h. Others are the same as the first embodiment.

specific Embodiment approach 3

[0033] Embodiment 3: This embodiment is different from Embodiment 2 in that: in step 1, the rod material with an aspect ratio of 1.75 is kept at 1075°C for 0.9h-1.2h. Others are the same as in the second embodiment.

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Abstract

The invention relates to a forming method of an eccentric ball bearing outer ring, in particular to a forming method of an eccentric ball bearing outer ring for controlling metal streamlines to be distributed along a channel. The invention aims to solve the technical problems that the metal streamline of the ferrule is cut off and the contact fatigue performance of the surface of a raceway of the ferrule is seriously reduced due to the fact that the existing bearing ferrule forging adopts a process of firstly freely forging a blank, then rolling the blank into an annular piece and finally turning a channel. According to the method, the bearing outer ring is directly formed through the eccentric channel in a ring rolling mode, the procedure that the metal flow lines are distributed along the channel replaces the procedure that the outer ring channel is machined in a cutting mode, metal flow lines are effectively prevented from being cut off, and the contact fatigue performance and the material utilization rate of materials can be improved. Due to the fact that the large upsetting ratio is adopted, the strain in the deformation process is increased, meanwhile, refining of grains and primary carbides in materials is caused by ring rolling forming, and then the performance of the bearing ring is improved.

Description

technical field [0001] The invention relates to a forming method of an eccentric ball bearing outer ring. Background technique [0002] Bearings are key components, and their failure may lead to accidents. The main mode of bearing failure is friction-induced raceway wear and fatigue spalling of the bearing rings. It is well known that the wear resistance of bearing ring grooves depends on the micro and macro structures formed during forging. During the metal forging process, under the action of high temperature and pressure, the elongation of grains and the aggregation of non-metallic inclusions will occur, and the direction of maximum deformation will be oriented to form a fiber structure. The impact strength of the metal fiber direction is 50% to 70% higher than that of the vertical direction. A problem in the manufacture of bearing rings is the formation of the macrostructure of the material and the distribution of the fibrous structure (streamlines) in a specific way....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B21J5/00B21K1/04
CPCB23P15/003B21J5/002B21K1/04
Inventor 姜宏伟于庆杰迟杰周丽娜张静静马芳于清成杜姣婧
Owner AVIC HARBIN BEARING
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