Laser surface hardening process of gear

A surface strengthening and gear technology, applied in the field of laser surface hardening technology, can solve the problems of high cost, unstable hardened layer quality, poor quenching effect at the top of the tooth, etc., to achieve improved service life, rapid self-cooling, and strong versatility Effect

Inactive Publication Date: 2003-02-05
GUANGTONG TECH GUANGZHOU CITY
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  • Abstract
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AI Technical Summary

Problems solved by technology

Sometimes the deformation cannot be controlled by quenching with a press, and finishing treatment is required; the heating furnace used in the carburizing process has high energy consumption, and liquid carburizing also involves NaCN highly toxic substances; Anti-seepage treatment
The manufacturing process of nitriding gears is simpler than that of carburizing. After nitriding, high hardness can be obtained without quenching. However, the nitriding process has a long cycle and high cost. The nitriding layer is thin and brittle. Anti-seepage treatment
The heating temperature of flame quenching and the depth of the hardened layer are not easy to control, the quality of the hardened layer is unstable, and the str

Method used

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  • Laser surface hardening process of gear
  • Laser surface hardening process of gear

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Embodiment

[0034] The invention is used for the laser surface hardening treatment of the tooth surface of the herringbone gear shaft of a certain wire rolling mill production line combined with a reducer. The material of the gear is 34CrNiMo, and the quenched and tempered hardness of the matrix is ​​HB300-320. Gear modulus Mn=16mm, number of teeth Z=22, helix angle β=26.83°. The laser treatment machine used in the present invention is the GFT-II laser heat treatment machine (with four-axis three-linkage numerical control system) produced by Guangzhou Futong Company. It proceeds as follows:

[0035] (1) The surface of the gear to be treated is cleaned and coated with light-absorbing paint;

[0036] (2) Use the laser beam to scan the surface of the gear tooth profile, so that the surface layer of the tooth profile can be quickly heated above the phase transition temperature;

[0037] (3) The laser beam leaves the tooth profile surface of the gear, and the gear itself is rapidly cooled an...

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Abstract

The laser surface-hardening process of gear includes the following steps: (1). cleaning surface of gear to be treated and applying light-absorbing paint; (2) scanning surface of gear by using laser beam to quickly heat the surface layer or gear to above phase transformation temp.; (3) removing laser beam from surface of gear, making gear self-body quickly cool and quench so as to form hardened layer on surface of gear. Said ivnention not only possesses high quenching hardness, but also the hardened layer formed on the surface of gear is a alloyed layer whose grains are refined, deformation is less and it has no environmental pollution.

Description

1. Technical field: [0001] The invention relates to a laser surface hardening process for gears, which belongs to the innovative technology of the gear surface hardening process. 2. Background technology: [0002] Gear transmission is a main form of mechanical transmission, and gears are important basic parts widely used in machines and mechanical products. Mechanical transmission requires gears to have good load-carrying capacity. The service life of gears is related to the quality of gear materials, the quality of machining and heat treatment, and the conditions of use. Among them, the gear material and heat treatment are the key factors that affect the bearing capacity and service life of the gear, and are also an important link that affects the quality of the entire gear production. The use practice of gears shows that the main damage forms of gears are tooth surface fatigue pitting, tooth surface wear, tooth surface gluing and tooth fracture. Therefore, the gear teet...

Claims

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Application Information

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IPC IPC(8): C21D1/09C21D9/32
Inventor 马春印赵钦
Owner GUANGTONG TECH GUANGZHOU CITY
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