Compound reinforcement method for gear surface

A surface composite and gear technology, which is applied in the direction of abrasives, metal processing equipment, abrasive jet machine tools, etc., can solve the problems of limited improvement of gear residual compressive stress and surface hardness, inability to effectively improve material fatigue strength, and large molybdenum disulfide particles. , to achieve the effect of improving lubricating ability and surface finish, improving contact fatigue life and anti-wear ability, reducing roughness and friction coefficient

Inactive Publication Date: 2017-06-13
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology can improve the wear resistance of the gear surface, the particles of molybdenum disulfide are too large, and there are residues on the gear surface after shot peening, and the hardness of the particles made of molybdenum disulfide is low, and the shot peening strength is not enough. The residual compressive stress and surface hardness of the gear are limited, and the fatigue strength of the material cannot be effectively improved

Method used

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  • Compound reinforcement method for gear surface
  • Compound reinforcement method for gear surface

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Use steel shots with a particle size of 0.6mm to carry out shot peening on low-carbon alloy steel gears for 95s under a pressure of 3.5Mpa;

[0041] (2) Put 0.05mm steel shot in the shot blasting material bin, heat it to 50°C, then add molybdenum disulfide 15 times its mass and mix thoroughly;

[0042] (3) Spray nitrogen cooled to 0°C onto the gear surface after shot peening in step (1), and then pass uncooled nitrogen into the shot peening material bin to push the mixture of steel shot and molybdenum disulfide against the gear surface Carry out shot peening treatment, the strength of shot peening is 0.3MPa, and the shot peening time is 50s. After the shot peening is finished, the gear with composite strengthened surface is obtained;

[0043] (4) Recover the steel shot that falls off from the gear surface after the shot peening in step (3) to the shot peening material bin for continued use.

Embodiment 2

[0045] (1) Use a steel shot with a particle size of 0.8mm, and carry out shot peening on the low-carbon alloy steel gear for 90s under a pressure of 4Mpa;

[0046] (2) Put 0.08mm steel shot in the shot blasting material bin, heat it to 180°C, then add molybdenum disulfide 20 times its mass and mix thoroughly;

[0047] (3) Spray nitrogen cooled to 0°C onto the gear surface after shot peening in step (1), and then pass uncooled nitrogen into the shot peening material bin to push the mixture of steel shot and molybdenum disulfide against the gear surface Carry out shot peening treatment, the strength of shot peening is 0.5MPa, and the time of shot peening is 40s. After the shot peening is finished, the gear with composite strengthened surface is obtained;

[0048] (4) Recover the steel shot that falls off from the gear surface after the shot peening in step (3) to the shot peening material bin for continued use.

Embodiment 3

[0050] (1) Use a steel shot with a particle diameter of 1mm to carry out shot peening for 85s to the low carbon alloy steel gear under a pressure of 4.5Mpa;

[0051] (2) Put 0.1mm steel shot in the shot blasting material bin, heat it to 300°C, then add molybdenum disulfide 25 times its mass and mix thoroughly;

[0052] (3) Spray nitrogen cooled to 0°C onto the gear surface after shot peening in step (1), and then pass uncooled nitrogen into the shot peening material bin to push the mixture of steel shot and molybdenum disulfide against the gear surface Carry out shot peening treatment, the strength of shot peening is 0.6MPa, and the shot peening time is 30s. After the shot peening is finished, the gear with composite strengthened surface is obtained;

[0053] (4) Recover the steel shot that falls off from the gear surface after the shot peening in step (3) to the shot peening material bin for continued use.

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Abstract

The invention relates to a compound reinforcement method for a gear surface. The compound reinforcement method comprises the following steps: firstly, the gear surface is subjected to shot blasting with steel shots with particle size being 0.6-1 mm; then molybdenum disulfide is mixed with particles with particle size being 0.05-0.1 mm, the mixture is used for performing shot blasting continuously on a gear, and the gear with compound reinforced surface is obtained. By means of the coupled effect of two processes including powerful shot blasting and molybdenum disulfide and particle mixed shot blasting, amplitude of tooth surface compressive stress deeper than the stress in single surface treatment process is obtained, and tooth surface hardness is improved substantially. Meanwhile, the lubricity of the gear surface is improved, the friction coefficient of the tooth surface is reduced, the lubricating capacity and the surface smoothness are improved, and gear meshing vibration noise is reduced. The effect of prolonging both the flexible life and contact fatigue life of the gear simultaneously is realized. The method adopts simple process and flexible conditions, can realize batch production and has good application prospect.

Description

technical field [0001] The invention relates to the field of gear processing and surface treatment, in particular to a method for compound strengthening of the gear surface. Background technique [0002] Low-carbon alloy steel gears are widely used in transmission machinery such as automobile transmissions and high-speed railways. As the transmission system continues to develop in the direction of high-speed, high-torque, miniaturization, and light weight, the fatigue strength and fatigue life of gears are raised. Higher requirements, the traditional low-carbon alloy steel gear carburizing and quenching heat treatment process is difficult to meet the fatigue strength and fatigue life requirements of transmission gears under harsh working conditions, high speed and high torque conditions. [0003] Shot peening technology is a method currently used to improve the bending fatigue life of gears. The existing ordinary fine particle strong shot peening technology can improve the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24C1/10B24C3/32
CPCB24C1/10B24C3/32
Inventor 陈勇臧立彬贾森李凯
Owner HEBEI UNIV OF TECH
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