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Convexity modifying method for ball track

A bearing raceway and raceway technology, which is applied in the field of crown modification of bearing raceways, can solve the problems of inability to realize bearing raceway surface machining, limited processing range, complex structure, etc., so as to shorten the production cycle and improve the contact Fatigue performance, the effect of improving machining quality

Active Publication Date: 2012-04-25
SHIBIAI SPECIAL BEARING LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Publication No. CN101502881A discloses a device for a CNC lathe. The device is provided with a tool holder capable of ultrasonic processing, and the tool holder is set at a certain position by several transmission mechanisms to realize the docking of the CNC lathe. Due to the complex structure of this technology and the limitation of the processing range, it can only process the general metal surface, and cannot realize the processing of the bearing raceway surface.

Method used

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  • Convexity modifying method for ball track
  • Convexity modifying method for ball track
  • Convexity modifying method for ball track

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A method for modifying the convexity of a bearing raceway. The bearing body manufactured in advance is machined out of the required raceway surface with a lathe, and then heat treated. The bearing body formed with the raceway surface and heat-treated is placed on an ultrasonic On the control cabinet, carry out at least one convexity modification on the raceway surface at the same time as finishing the raceway surface, the steps are as follows:

[0041] Step 1. Machining the prefabricated bearing body to the required raceway surface with a lathe;

[0042] Step 2, heat-treating the bearing body forming the raceway at 820°C;

[0043] Step 3. Set the heat-treated bearing body on the ultrasonic control cabinet with the finishing device and the repairing device, set the linear speed of the workpiece to 80-110m / min, the cutting amount of the finishing device and the cutting speed of the vibrating tool head The amount is 0.1 ~ 0.25mm / r, and the amount of convexity of the racew...

Embodiment 2

[0046] A method for modifying the crown of a bearing raceway, the steps are as follows:

[0047] Step 1. Machining the prefabricated bearing body to the required raceway surface with a lathe;

[0048] Step 2, heat-treating the bearing body forming the raceway at 830°C;

[0049] Step 3. Set the heat-treated bearing body on the ultrasonic control cabinet with the finishing device and the repairing device, set the linear speed of the workpiece to 80-110m / min, the cutting amount of the finishing device and the cutting speed of the vibrating tool head The amount is 0.1~0.25mm / r, and the convexity modification amount of the raceway is set to 10μm-30μm;

[0050] Step 4: Turn on the ultrasonic numerical control device, and the finish turning tool holder set at one end of the CNC lathe drives the turning tool to perform finish turning on the bearing raceway. The trimming device on the frame is pressed against the finished bearing raceway surface under the force of the pressing device...

Embodiment 3

[0052] A method for modifying the crown of a bearing raceway, the steps are as follows:

[0053] Step 1. Machining the prefabricated bearing body to the required raceway surface with a lathe;

[0054] Step 2, heat-treating the bearing body forming the raceway at 840°C;

[0055] Step 3. Set the heat-treated bearing body on the ultrasonic control cabinet with the finishing device and the repairing device, set the linear speed of the workpiece to 80-110m / min, the cutting amount of the finishing device and the cutting speed of the vibrating tool head The amount is 0.1 ~ 0.25mm / r, and the amount of convexity of the raceway is set to 10μm-30μm;

[0056]Step 4: Turn on the ultrasonic numerical control device, and the finish turning tool holder set at one end of the CNC lathe drives the turning tool to perform finish turning on the bearing raceway. The trimming device on the frame is pressed against the finished bearing raceway surface under the force of the pressing device. The com...

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Abstract

The invention provides a convexity modifying method for a ball track, which relates to a machining technology of ball tracks. An ultrasonic digital controller is adopted to hammer the ball track with ultrahigh frequency equal or more than 30KHz, and the surface of the ball track is modified into a logarithmic curve with certain convexity from a straight track. The method comprise the steps of; machining the required surface of the ball track at first, carrying out thermal treatment at the temperature of 820 DEG C to 880 DEG C, and arranging a bearing body on the ultrasonic digital controller and carrying out finish turning in advance; and carrying out ultrahigh frequency hammering on the surface of the ball track by adopting a vibration tool head of a modification device when the finish turning is carried out to the half of the ball track so that the finish turning and the modification are carried out at the same time, wherein the roughness of the ball track can be promoted by three levels or more, wherein the Ra value reaches 0.2mum, and the processing efficiency is enhanced by over 50% as compared with the machining efficiency of the traditional ground finish. The metal texture of the surface of the ball track is more compact, the micro-hardness of the surface of the ball track is enhanced by over 20%, the contact fatigue of the ball track is enhanced, the bearing capacity is enhanced by over 10%, and the service life of the bearing is prolonged by over 30%.

Description

technical field [0001] The invention relates to the processing technology of the bearing raceway, in particular to a method for modifying the crown of the bearing raceway. Background technique [0002] In bearing processing, especially for the convexity modification of the bearing raceway, it is difficult to realize the modification in the existing technology. Due to the precision of the bearing is mainly reflected in the raceway, especially the shape accuracy of the surface of the raceway, it is an important standard to measure the precision and quality of the bearing. In the processing and manufacturing process in the prior art, the surface of the manufactured products, especially the raceways of medium and large bearings, is generally a straight line, and it is difficult to form a logarithmic curve, which is far from satisfying the use of special bearings. The reason is that it is impossible to accurately modify the bearing raceway surface. If the oilstone super-finishin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P17/00
Inventor 王迪梅建洛
Owner SHIBIAI SPECIAL BEARING LUOYANG
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