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Heat treatment technology for increasing hardness of eccentric body of pressing machine

A press and eccentric body technology, applied in the field of heat treatment, can solve the problems of large cross-section of the eccentric body, unevenness, scrapping of casting parts, etc., and achieve the effect of simple operation and convenient implementation

Inactive Publication Date: 2015-05-20
李清扬
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the large cross-section of the eccentric body, the effective thickness of the heat treatment varies greatly, the fluidity during the casting process is poor, and the normalizing process cannot be uniform, and defective castings are easily scrapped.

Method used

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Embodiment Construction

[0013] A heat treatment process for improving the hardness of the eccentric body of a press, characterized in that it comprises the following steps:

[0014] (1) Place the eccentric body of the press in a heating furnace, heat it to 550-650°C, and keep it warm for 3-5 hours;

[0015] (2) Put the heat-preserved eccentric body of the press into the heating furnace, heat it to 850-900°C, keep it warm for 5-6 hours, and put it in the air to cool to room temperature;

[0016] (3) Place the eccentric body of the press that has been cooled to room temperature in a heating furnace and heat it to 650°C, and keep it warm for 3-5 hours;

[0017] (4) Continue to heat the eccentric body of the press to above 850°C and keep it warm for 5-6 hours, then cool it in the air until the temperature of the eccentric body of the press is 840-860°C, put the eccentric body of the press in 30-50 Cool in oil for 50-60 minutes;

[0018] (5) Keep warm in a tempering furnace at 350-400°C for 5-8 hours, t...

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Abstract

The invention provides a heat treatment technology for increasing the hardness of the eccentric body of a pressing machine. The technology can reduce the chance of cracking of eccentric body of a pressing machine so as to make the eccentric body meet the usage requirements of pressing machine. The heat treatment technology comprises the following steps: (1) placing an eccentric body of a pressing machine in a heating furnace, heating to a temperature of 550 to 650 DEG C, and then maintaining the temperature for 3 to 5 hours; (2) then placing the eccentric body after the temperature maintaining step into a heating furnace, heating to a temperature of 850 to 900 DEG C, maintaining the temperature for 5 to 6 hours, then taking out the eccentric body out of the heating furnace, and cooling in the air to the room temperature; (3) heating the eccentric body with a room temperature in a heating furnace, heating to a temperature of 650 DEG C, and maintaining the temperature for 3 to 5 hours; (4) going on heating the eccentric body to a temperature of 850 DEG C or more, maintaining the temperature for 5 to 6 hours, then cooling in the air to a temperature of 840 to 860 DEG C, and then cooling in oil with a temperature of 30 to 50 DEG C for 50 to 60 minutes; (5) maintaining the temperature in a tempering furnace with a temperature of 350 to 400 DEG C for 5 to 8 hours, taking out the eccentric body out of the tempering furnace, and finally cooling in the air naturally.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a heat treatment process for improving the hardness of an eccentric body of a press. Background technique [0002] Due to the large cross-section of the eccentric body, the effective thickness of the heat treatment varies greatly, the fluidity during the casting process is poor, and the normalizing process cannot be uniform, and defective castings are easily scrapped. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a heat treatment process to increase the hardness of the eccentric body of the press, reduce the cracking ratio of the eccentric body of the press, and meet the use requirements of the press. [0004] In order to solve the problems of the technologies described above, the present invention is achieved through the following measures: [0005] A heat treatment process for improving the hardness of an eccentric ...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/00
Inventor 李清扬
Owner 李清扬
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