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A method for softening the carburized area of ​​css-42l gear steel after carburizing

A carburizing, gear steel technology, applied in the softening field, can solve the problems of low production efficiency, grinding burns, etc.

Active Publication Date: 2021-02-12
HARBIN DONGAN ENGINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For parts after carburizing, sub-temperature annealing, quenching, and aging tempering, gear grinding is usually used. Since the hardness of CSS-42L carburized layer structure is as high as HRC60 or more, grinding burns may occur during grinding, and grinding Machining is less productive than gear shaping and hobbing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0019] A spur gear part used in an aviation transmission system is made of CSS-42L gear steel. The tooth surface of the part is required to be carburized before tooth profile processing. Since the surface hardness after carburizing exceeds HRC60, advanced softening treatment is required before processing , and to ensure the processing quality and efficiency, the specific implementation steps are as follows:

[0020] 1. After carburizing, the parts are directly placed in a vacuum oil quenching furnace for high-temperature austenitization. The austenitization temperature is 1100°C. After holding for 3 hours, vacuum oil quenching is carried out. The temperature of the quenching oil bath is 60°C;

[0021] 2. After oil quenching, carry out stress relief treatment at 200°C, and the stress relief time is 3 hours;

[0022] 3. After the stress is eliminated, hobbing the spur tooth surface to the required size;

[0023] 4. After the hobbing of the straight tooth surface is completed, t...

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Abstract

The invention relates to a method for softening the carburized region of gear steel after carburizing. After high-temperature austenitization, oil quenching and stress relief treatment, the Ms point of the carburized layer structure is greatly reduced, and the hardness of the material may be reduced to HRC28. Between ~35, gear shaping, gear hobbing or finishing turning can be performed. After the material is softened by the invention, the grinding process can be replaced, the occurrence of grinding burns can be effectively avoided, and the production efficiency can be improved.

Description

technical field [0001] The invention relates to a softening method, in particular to a softening method of a carburized region of CSS-42L gear steel after carburizing. Background technique [0002] Aviation heavy-duty traditional gears and gear shafts are usually made of CSS-42L carburized gear steel. After carburizing, sub-temperature annealing, quenching, aging and tempering, after working continuously at 427°C for 500 hours, the carburized layer structure still has excellent high-temperature red hardness, which is maintained above HRC60, and has excellent dry friction and wear resistance. [0003] For parts after carburizing, sub-temperature annealing, quenching, and aging tempering, gear grinding is usually used. Since the hardness of CSS-42L carburized layer structure is as high as HRC60 or more, grinding burns may occur during grinding, and grinding Compared with gear shaping and hobbing, machining has low production efficiency. Contents of the invention [0004] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D6/04C21D1/74C21D1/773C21D9/32
CPCC21D1/18C21D1/74C21D1/773C21D6/04C21D9/32C21D2261/00
Inventor 孙振淋辛玉武周动林刘慧郝博健辛昕金玉亮曾西军徐奉鑫崔学威
Owner HARBIN DONGAN ENGINE GRP
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