Heat treatment process of axle box rear cover
An axle box and process technology, applied in the field of heat treatment of metal materials, can solve the problems of high heating temperature, unsuitable for mass production, heat treatment stress residual, etc., to ensure comprehensive mechanical properties, reduce secondary stress residual, and hold time. optimized effect
Active Publication Date: 2017-01-04
CRRC CHANGZHOU TECH MARK IND CO LTD +1
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Problems solved by technology
The heating temperature of this annealing process is high and the time is short, which can stabilize the internal lattice dislocation of 5083, but cannot remove the deformation stress on the macrostructure, and the grain growth after heat treatment will reduce the mechanical properties. and heat treatment stress residues and other issues
If the method of high and low temperature cycle is used to eliminate stress, the effect of removing stress at low temperature is not obvious because aluminum alloy has better comprehensive properties such as strength and plasticity at low temperature and low molecular mobility.
If the natural aging method is used to eliminate stress, it will take a long time, usually in months or even years, which will affect the production efficiency of the product and is not suitable for mass production
Method used
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[0026] The present invention will be further described in detail below in conjunction with specific embodiments.
[0027] Example: Taking 5083 as the material of the axle box rear cover formed by precision forging as an example, the present invention will be further described in detail.
[0028] See Figure 1~7 As shown, a split axle box rear cover 1 for high-speed EMUs is assembled by an upper rear cover body 1-1 and a lower rear cover body 1-2. The material of the axle box rear cover 1 is aluminum alloy 5083, and the upper rear cover The heat treatment process of the axle box rear cover 1 assembled by precision forging the body 1-1 and the lower rear cover body 1-2 includes the following steps:
[0029] The first stage: Put the precision forged axle box back cover 1 on the drying rack 2 without superimposing and contacting each other, and put the drying rack 2 into the box-type resistance furnace, and heat it from room temperature to 280℃ for heat preservation 1 hour, then cooled ...
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Abstract
The invention provides a thermal treating process of a railway vehicle axle box rear cover which is made by using 5083 as a material. The thermal treating process comprises the following steps: heating the product in a box-type resistance furnace to 250-300 DEG C by using a stepped annealing method and keeping the temperature for 1-2 h; furnace cooling to a temperature below 100 DEG C; placing the product under the environment temperature for more than 8 h; placing the product in the box-type resistance furnace to heat to 150-200 DEG C and keeping the temperature for 2-3 h; and furnace cooling to the room temperature. According to the thermal treating process, the interior distortion of the material is restored and cooled through relatively low temperature and relatively short time in the first stage, standing is carried out for a certain time to complete stress transition, and then the macro stress of the product is eliminated through relatively low temperature and relatively long time, so that the problems of interior grain fusion and secondary stress are avoided, the forging blank is more stable, the trouble caused by deformation after processing is effectively avoided and the product requirements can be effectively satisfied.
Description
Technical field [0001] The invention relates to a heat treatment process of metal materials, in particular to a heat treatment process of an axle box rear cover for rail vehicles. Background technique [0002] The axle end of the rail vehicle is provided with an axle box device, the axle box device is connected to the car body and the wheel set, and the inner end of the axle box rear cover is installed. The rear cover of the axle box is used to protect and support the bearing, and has the functions of sealing, tightening and dust prevention. The rear cover of the axle box is a split structure, which is assembled by upper and lower rear covers. In order to facilitate the assembly of the axle box rear cover to the axle box device and ensure the performance of the axle box rear cover, the deformation of the axle box rear cover after finishing processing is required to be small, that is, the deformation dimensions of the upper and lower rear covers must be Within the specified rang...
Claims
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IPC IPC(8): C21D9/00
Inventor 孙士俊熊四平易峰
Owner CRRC CHANGZHOU TECH MARK IND CO LTD