Laser surface hardening process of gear

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...

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 structure of the nozzle is complex

The gear induction heating and quenching method is widely used, but when the rotary induction heating and quenching method is used, for the gear with a slightly larger modulus, in order to achieve heating of all teeth, the tip of the tooth will be over-burned; while the single-tooth continuous heating and quenching method , and it is not easy to obtain a uniform hardened layer along the entire tooth profile, especially the hardness of the tooth root is poor; when the method of continuous heating and quenching along the tooth groove is adopted, the quenching effect at the top of the tooth is poor, and the inductor is complicated to make and has poor versatility, so the cost high

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