Environment-friendly heat treatment process for large shaft forgings

A technology for shaft parts and heat treatment furnaces, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems of large shaft parts with large weight, large cross-sectional size changes, and low oil cooling hardness, etc., to reduce quenching deformation and cracking tendency, overcome the effect of fast cooling rate and improve working conditions

Inactive Publication Date: 2011-07-06
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an environmentally friendly heat treatment process for large-scale shaft forgings, so as to solve the problems that large-scale shaft parts are prone to deformation or even defects when water cooling is used, low hardness and environmental pollution are easy to occur when oil cooling is used; and solve Large-scale shaft parts are heavy in weight, large in cross-sectional size, and uneven in performance after heat treatment.

Method used

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  • Environment-friendly heat treatment process for large shaft forgings
  • Environment-friendly heat treatment process for large shaft forgings
  • Environment-friendly heat treatment process for large shaft forgings

Examples

Experimental program
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Embodiment Construction

[0025] combine figure 1 , the quenching process of a large rotor made of 30CrMoV steel and weighing 28 tons, the specific process steps are as follows:

[0026] (1) Lift the large rotor vertically into the heat treatment furnace by using chucks, raise the temperature to 345±5°C at a rate of 40°C / hour, and keep it warm for 4 hours; then raise the temperature to 655±5°C at a rate of 40°C / hour , keep warm for 6.5 hours;

[0027] (2) After heat preservation at 655°C, heat up to the quenching temperature of 950±5°C at a rate of 45°C / hour, and hold for 10 hours;

[0028] (3), quickly hang the large rotor vertically into the quenching tank, in terms of volume percentage, the quenching medium in the quenching tank is 8% PAG and 92% water, the temperature of the quenching medium is controlled below 50°C, and quenched for 270 minutes;

[0029] (4) Lift out the large rotor and cool it below 200°C, install the furnace, heat up to 350±5°C at a speed of 30°C / hour, and keep it warm for 8 h...

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Abstract

The invention discloses an environment-friendly heat treatment process for large shaft forgings. According to the heat treatment process, the traditional oil and tap water are substituted by a commercial water soluble quenching medium PAG (poly alkylene glycol) or BW, the concentration of the quenching medium PAG or BW is adjusted, and the process parameters such as the heating speed, holding time, quenching temperature, quenching time, tempering temperature, cooling speed and the like are strictly controlled, thereby solving the problems of deformation and even defects liable to occur by water cooling of large shaft parts and lower rigidity, environmental pollution and the like liable to occur by oil cooling of large shaft parts, and simultaneously solving the problems of heavy weight, great change of sectional dimension, uneven performance after heat treatment and the like of large shaft parts.

Description

[0001] technical field [0002] The invention relates to the technical field of shaft heat treatment, in particular to an environmentally friendly heat treatment process for large shaft forgings. Background technique [0003] The quenching media used in the traditional quenching of large parts mostly use tap water and oil. Due to the characteristics of water, the cooling speed is faster in the high temperature zone and the low temperature zone, and the steam film is generated too quickly when the water temperature is increased, so it is difficult to control the heat treatment process conditions when water is used as the quenching medium, and defects such as quenching cracks are prone to occur; The cooling rate of oil is relatively slow. When it is used for quenching treatment of large parts of medium-carbon low-alloy steel, problems such as hard quenching or shallow hardened layer often occur. More importantly, oil is used as a quenching medium and is seriously polluted. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/28C21D1/18C21D11/00
Inventor 闫焉服宋克兴王淼辉周永松李永兵葛学元赵培峰张彦敏
Owner HENAN UNIV OF SCI & TECH
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