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Surface heat-treatment process for eccentric shaft

A surface heat treatment, eccentric shaft technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as overheating, soft spots, and shortened service life of eccentric shafts

Inactive Publication Date: 2008-11-26
王东华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these reasons, it is easy to produce heat treatment defects such as quenching cracks, overheating, and soft spots.
As a result, the technical requirements for heat treatment of the eccentric shaft cannot be met. Even if there is no crack, the service life of the eccentric shaft is greatly shortened.

Method used

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Experimental program
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Effect test

Embodiment Construction

[0007] Specific embodiments of the present invention are described below.

[0008] Place the eccentric shaft fixed at the upper and lower ends in the upright eccentric induction coil by using the upper and lower top-to-top fixing devices of the eccentric shaft, heat the working surface of the eccentric shaft with electricity, and cut off the power when it reaches the quenching temperature of 910-950°C; fix it through the eccentric shaft The device quickly moves the eccentric shaft down, so that the eccentric shaft is separated from the eccentric induction coil, and sprayed with water for cooling and quenching. This method can make the temperature of the working surface of the eccentric shaft uniform, and it can be cooled and quenched by spraying water when the power is off. In order to ensure uniform water spray quenching of the eccentric shaft, the eccentric shaft fixing device or water spray cooling device can rotate at this time until the final temperature of the workpiece ...

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Abstract

A heat treatment method for eccentric shaft surface adopts an eccentric shaft fixation device to place a eccentric shaft with a fixed upper end and a fixed lower end into an erect eccentric induction coil. A working surface of the eccentric shaft is energized and heated, and the electricity is cut off when the quenching temperature of 910 to 950 DEG C is reached. The eccentric shaft fixation device rapidly moves the eccentric shaft downwards so that the eccentric shaft is away from the erect eccentric induction coil. The surface is cooled by spouting water and quenched. The method can keep the temperature uniform on the working surface of the eccentric shaft, the electricity is cut off and the water is spouted for cooling and quenching until the final temperature of the workpiece is controlled between 120 to 150 DEG C, and then sprouting water is stopped and the eccentric shaft is taken away and finally the quenching course is finished. The method can keep the heating temperature quite uniform on the working surface of the eccentric shaft so as to ensure and improve the quenching quality of the eccentric shaft as well as lower the rejection rate of quenching. By adopting the method, the eccentric shaft is heated and quenched, thus prolonging the service life of the eccentric shaft, preventing eccentric shaft failure owing to early exfoliating caused by partial contact fatigue of the working surface of the eccentric shaft.

Description

technical field [0001] The invention relates to a heat treatment method for the surface of an eccentric shaft, which belongs to the technical field of metal heat treatment. Background technique [0002] In the prior art, when the surface heat treatment of eccentric shaft parts is carried out, the commonly used heating methods include heating kiln and medium and high frequency induction coil heating. The heating infrastructure of the kiln is costly and consumes a lot of energy. When the eccentric induction coil is in use, because the radius of curvature of the working surface of the eccentric shaft is different, the temperature is low at the place with a large radius of curvature, while the temperature at a place with a small radius of curvature is high or even melted. . When the eccentric shaft is heated in the eccentric induction coil, the temperature on the surface of the eccentric shaft is very uneven, so the hardness of the working surface of the eccentric shaft after q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/28C21D1/10
CPCY02P10/25
Inventor 王东华
Owner 王东华