Transmission shaft heat treatment temperature control method and heat treatment process

By calculating the thermal hysteresis coefficient Ki and temperature difference inversion, combined with adaptive heat preservation control, the temperature difference problem caused by diameter differences in the heat treatment of the drive shaft was solved, achieving precise temperature control and improving the quality and reliability of the drive shaft.

CN122147032APending Publication Date: 2026-06-05ZHEJIANG SHENFA HEAVY IND MASCH TECH CO LTD +1
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Patent Information

Application Number
CN202610403905.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-30
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In the existing heat treatment process for drive shafts, the significant difference in thermal inertia caused by the difference in diameter of the stepped sections is not fully considered. This results in excessive internal and external temperature differences, insufficient core heating, or surface overheating, which affects the hardness, toughness, and fatigue strength of the drive shaft and poses a risk of deformation and cracking.

Method used

By calculating the thermal hysteresis coefficient Ki, real-time temperature is collected and internal temperature is inverted. Temperature difference threshold and adaptive heat preservation control are set, and the heating rate is adjusted in segments to ensure that the internal and external temperature difference is within the allowable range. The heat dissipation conduction algorithm and temperature difference constraint judgment are used to achieve segmented differentiated temperature control.

Benefits of technology

It improves temperature control accuracy, significantly reduces the risk of drive shaft deformation and cracking, increases product qualification rate, and ensures uniform mechanical properties and service life of each stage.

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Abstract

The invention discloses a transmission shaft heat treatment temperature control method and a heat treatment process. The heat treatment process comprises the following steps that S1, the heat lag coefficient of each step section of a transmission shaft is obtained through calculation; s2, the temperature of the transmission shaft is collected in real time, internal temperature inversion is conducted, the surface temperature of each step section of the transmission shaft is obtained, the real-time core temperature Tci (t) of each step section is inverted, and then the real-time internal and external temperature difference of each step section is obtained through calculation; s3, temperature difference constraint judgment: setting an internal and external temperature difference threshold value as delta Tallow, obtaining a maximum internal and external temperature difference value delta Tmax of each step section of the transmission shaft, and if delta Tmax is smaller than or equal to delta Tallow, performing the step S4; and S4, the heating rate vi of each step section of the transmission shaft is obtained, and the minimum value serves as the actual heating rate. According to the transmission shaft heat treatment temperature control method and the heat treatment process, the heating temperature difference of inner and outer shaft bodies is reduced, and the product quality is improved.
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