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
CN102115809AInactive Publication Date: 2011-07-06HENAN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN UNIV OF SCI & TECH
Publication Date
2011-07-06
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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