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Heat treatment method for improving hardness of ZG270-500 eccentric body

A heat treatment method and eccentric body technology, applied in the field of heat treatment, can solve problems such as scrapped parts, prone to cracks, failure to meet the use requirements, etc., and achieve the effect of simple operation and convenient implementation

Active Publication Date: 2010-05-12
JIER MACHINE TOOL GROUP
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AI Technical Summary

Problems solved by technology

For the eccentric body of ZG270-500 material, the normal heat treatment process can only be normalized, and the hardness is about 140HB, which cannot meet the use requirements of hardness ≥ 180HB
If the heat treatment method is changed to increase the cooling rate, cracks are easily generated and the parts are scrapped

Method used

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Examples

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Effect test

Embodiment Construction

[0019] A heat treatment method for improving the hardness of ZG270-500 eccentric body, characterized in that it comprises the following steps:

[0020] 1) Normalizing of eccentric body:

[0021] (1) Place the eccentric body in a heating furnace and heat it above 650-670°C, and keep it warm for more than 3 hours;

[0022] (2) Put the heat-preserved eccentric body in a heating furnace and heat it above 850-870°C, heat it for more than 5 hours and leave the furnace, and place it in the air to cool to room temperature;

[0023] 2) The eccentric body is water-cooled first and then oil-cooled as a whole:

[0024] (1) Isothermal: place the above-mentioned eccentric body cooled to room temperature in a heating furnace, heat it to 650-670°C, and keep it warm for more than 3 hours;

[0025] (2) Heating: Continue heating the above eccentric body to 850-880 °C, and keep it warm for more than 5 hours, then cool it in the air until the sharp corner of the eccentric body turns black and th...

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Abstract

The invention discloses a heat treatment method for improving hardness of ZG270-500 eccentric body, comprising the following steps: placing the eccentric body in a heating furnace, heating till the temperature is higher than 650 DEG C, preserving the heat for more than 3 h, then placing in a heating furnace, heating till the temperature is higher than 850 DEG C, preserving the heat for more than 5 h, then taking out, and placing in the air to cool to room temperature; heating the cooled eccentric body in a heating furnace till the temperature is increased to 650 DEG C, and preserving the heat for more than 3 h; continuously heating the eccentric body till the temperature is higher than 850 DEG C, preserving the temperature for more than 5 h, then cooling in the air till the sharp angle part thereof becomes black and other parts thereof is 840 to 850 DEG C, then cooling the thickest part of the eccentric body with water, placing the whole eccentric body in the oil of 80 DEG C, and cooling for 50 to 60 min; finally, tempering. The thickest part of the eccentric body is cooled with water, and the whole eccentric body is cooled with oil, thus all parts of the eccentric body have uniform hardness, and the hardness is not less than 180 HB.

Description

(1) Technical field [0001] The invention relates to a heat treatment method, in particular to a heat treatment method for increasing the hardness of a ZG270-500 eccentric body. (2) Background technology [0002] According to the current national standard, cast steel ZG270-500 is represented by mechanical properties, and the chemical composition of the material is used as a reference. Therefore, under the premise of ensuring mechanical properties, its chemical composition fluctuates in a large range. Due to the large cross-section of the eccentric body, the effective thickness of heat treatment varies greatly. The eccentric body of ZG270-500 material can only be normalized in the normal heat treatment process, and the hardness is about 140HB, which cannot meet the use requirements of hardness ≥ 180HB. If the heat treatment method is changed to increase the cooling rate, cracks will easily occur and the parts will be scrapped. (3) Contents of the invention [0003] The tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/28C21D1/18C21D1/60C21D1/58C21D11/00
Inventor 张承云王剑锋董希华王建国
Owner JIER MACHINE TOOL GROUP
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