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Softening method of carburizing area obtained after CSS-42L gear steel is carburized

A carburized, gear steel technology, applied in the field of softening, can solve the problems of grinding burns and low production efficiency

Active Publication Date: 2017-05-31
HARBIN DONGAN ENGINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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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PUM

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Abstract

The invention relates to a softening method of a carburizing area obtained after CSS-42L gear steel is carburized. After high-temperature austenitizing, oil quenching and stress removal treatment are performed, the Ms point of a carburized layer tissue is made to be greatly lowered, hardness of a material may be lowered to be HRC 28-35, and gear shaping, and gear hobbing or finish turning machining can be performed. After the material is softened, a grinding process can be replaced, grinding burn is effectively avoided, and production efficiency is 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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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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