Gas Nitriding Processing Technology of Rotary Shaft of Automobile Differential

Abstract

The invention provides a gas nitriding process for the rotating shaft of an automobile differential, which includes the following steps: sending the material frame filled with the rotating shaft of the differential into a cleaning machine to clean the surface of the parts; putting it into a nitriding furnace, and closing the furnace door; Raise the temperature for surface pre-oxidation treatment; vacuumize the nitriding furnace cavity for surface plasma activation treatment; pass N into the nitriding furnace 2 , raise the temperature of the shaft of the differential gear in the furnace to 570°C; feed NH into the nitriding furnace 3 , CO 2 , N 2 , to keep warm; pass N 2 After cooling down, vacuumize and start the ion activation treatment; after adjusting the temperature to 530°C, carry out oxidation treatment; pass N into the nitriding furnace cavity 2 Cool the shaft of the differential gear; open the bleed valve to release the N in the nitriding furnace cavity 2 At normal pressure, the nitriding furnace is turned on, and the shaft of the differential gear comes out of the furnace with the frame. The invention improves the heat treatment parameters of the prior art, enhances the strength of the surface of the shaft of the differential gear, thereby improving the wear resistance, and at the same time can reduce the heat treatment time and improve the treatment efficiency.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment and heat treatment, in particular to a gas nitriding process for a shaft of an automobile differential gear. Background technique [0002] A vehicle differential is a mechanism that enables the left and right (or front and rear) drive wheels to rotate at different speeds. It is mainly composed of left and right side shaft gears, two planetary gears, a rotating shaft and a gear frame. The function is to make the left and right wheels roll at different speeds when the car is turning or driving on an uneven road, that is, to ensure the pure rolling motion of the driving wheels on both sides. The differential is installed to adjust the speed difference between the left and right wheels. [0003] With the development of new energy vehicles, various OEMs have also begun to deploy new energy vehicles. The power of new energy vehicles is characterized by high torque, which puts forward h...

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Problems solved by technology

[0003] With the development of new energy vehicles, various OEMs have also begun to deploy new energy vehicles. The power of new energy vehicles is characterized by high torque, which puts forward higher requirements for the bearing capacity of parts and surface wear of parts. The differential shaft The fuel vehicle uses alloy material 30CrNiMo, and the surface treatment technology requires plasma gas nitriding. The heat treatment process is carried out according to the traditional process parameters. wear, and cannot meet the wear resistance requirements of the new energy differential shaft

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