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Novel anti-cracking quenching method for pinch roller work-piece

An anti-cracking and new quenching technology, applied in the field of quenching, can solve the problems of the hardness of the pressure wheel workpiece not meeting the requirements, cracking, easy cracking, etc., and achieve the effect of overcoming cracking after quenching

Inactive Publication Date: 2014-12-10
上海朋泰机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the workpiece is relatively thick, the hardness of the press wheel workpiece quenched by this process cannot meet the requirements. If water quenching is used, it will easily crack, and if water quenching and oil cooling are used, cracking will also occur.

Method used

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  • Novel anti-cracking quenching method for pinch roller work-piece
  • Novel anti-cracking quenching method for pinch roller work-piece
  • Novel anti-cracking quenching method for pinch roller work-piece

Examples

Experimental program
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Effect test

Embodiment 1-3

[0019] Heat the pressure roller workpiece to 840°C for quenching, and keep it warm for 1.3h. After quenching, because the temperature of the bottom of the workpiece is slightly higher than that of the upper part, a wet cloth is placed on the plane in advance, and then the bottom of the workpiece after being released from the furnace is placed on the wet cloth to cool for 1-2 seconds, so that the bottom of the workpiece is pre-cooled until the temperature of the entire workpiece is uniform . Then the pre-cooled workpiece is water quenched. The water quenching time is 20s until the sound of the workpiece in the water becomes smaller, and then the workpiece is quickly taken out and placed in oil at a temperature of 30-40°C to cool below 80°C. Temper at 180°C for 4h.

[0020] Simultaneously with the quenching method of the pressure wheel workpiece in the prior art as contrast, compare with the improved new quenching method of the present invention, quenching process condition is ...

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Abstract

The invention discloses a novel anti-cracking quenching method for a pinch roller work-piece. The method comprises the following steps: heating, heat preservation, water quenching, oil cooling and tempering, wherein the method also comprises a precooling step before water quenching and after heat preservation and discharging. The quenched pinch roller work-piece is subjected to a wet cloth precooling method, and water quenching and oil cooling are carried out after the temperature of the whole pinch roller work-piece is even, so that the defect in an existing process that the pinch roller work-piece cannot reach the technological requirements in term of hardness and cracks after being quenched is overcome.

Description

technical field [0001] The invention belongs to the field of quenching, and in particular relates to a new quenching method for preventing cracking of pressure wheel workpieces. Background technique [0002] The workpiece material of the pressure wheel is 9Cr2Mo, and the structure is as follows figure 1 As shown, the center of the workpiece is a through hole, and the process requires a hardness of 61-65HRC. In the prior art, the quenching process of the press wheel workpiece is as follows: (1) heating to 840°C and holding for 1.3h; (2) oil quenching; (3) tempering at 180°C. However, because the workpiece is relatively thick, the hardness of the press wheel workpiece quenched by this process cannot meet the requirements. If it is changed to water quenching, it will be easy to crack, and if water quenching and oil cooling are used, cracking will also occur. Therefore, there is an urgent need to improve the quenching process of the existing pressure wheel workpiece, so as to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18
Inventor 潘诗良
Owner 上海朋泰机械科技有限公司