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Rocker bearing high carbon-chrome steel outer ring composite treatment technology

A composite treatment, high-carbon chromium steel technology, applied in the direction of bearing components, shafts and bearings, engine components, etc., can solve problems such as bearing wear and crack failure, engine failure, etc.

Inactive Publication Date: 2008-03-05
上海百信轴承有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This processed product is applied to the rocker arm of an automobile engine. Under its special temperature, load, and lubrication conditions, the bearing is prone to wear and crack failure, which will cause serious engine failure, and it is necessary to replace the bearing and repair the engine.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0005] Take a bearing ring (high-carbon chromium steel GCr15) with an outer diameter of 25mm, an inner diameter of 19mm, and a width of 12mm as an example. First, heat-treat the bearing ring of the rocker arm in a box-type multipurpose furnace. 3.5 hours, while the carbon potential in the heating furnace atmosphere is kept at 1.05 and the nitrogen potential volume ratio is 5% (the gas volume ratio in the furnace). After heat preservation, it is cooled and quenched in quenching oil. The ferrule after rough grinding is put into the shot blasting machine, and the ceramic shot with a diameter of 3.5mm is freely sprayed at a speed of 70m / s for 20 minutes to obtain a large surface compressive stress on the surface.

[0006] After adopting this heat treatment process and rough grinding and shot peening, the amount of residual austenite on the surface of the bearing is 15% to 20%, and the residual compressive stress on the surface is 400 to 1000Mpa.

[0007] After testing and testing,...

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Abstract

The invention is characterized in that: 1. The inner ring and the outer ring of the rocker bearing is heated in an heating furnace under 815-830 degree C for 2-5 hours, at same time carbon potential 0.9-1.2 is charged into the heating furnace and the volume ratio to nitrogen potential is 3-6%; 2. The inner ring and the outer ring of the rocker bearing after heat treatment are coarsely ground and sprayed by ceramic pills whose diameter is 2-5mm in 40-100m / s speed for 15-30 minutes. Advantages: ideal residual autenite content, high surface pressure and long service life.

Description

technical field [0001] The invention relates to a compound treatment technology of heat treatment and strengthening process, in particular to a compound treatment technology of a high-carbon chromium steel outer ring of a rocker arm bearing. Background technique [0002] Automobile engine rocker arm bearings are in special and harsh working conditions during the operation of the vehicle engine. In order to make the bearing more suitable for its special temperature, load, and lubrication conditions, and improve the service life of the bearing, it is necessary to adjust the automotive engine rocker arm during production. Bearings are heat treated. The content of retained austenite in conventional heat treatment is usually about 10%, which cannot meet the needs. The surface compressive stress of ordinary strengthening process is only 200-500Mpa, which cannot meet the requirements of use. The heat treatment method of conventional GCr15 bearing rings is: heating and holding at 8...

Claims

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Application Information

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IPC IPC(8): F16C33/64F01L1/18
Inventor 吴道年郭长建刘斌梁华军
Owner 上海百信轴承有限公司
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