Manufacturing technology for carburizing steel gear

A production process and carburizing steel technology, applied in the field of gear processing technology, can solve the problems of incomplete removal of internal stress of workpiece, difficult control of workpiece deformation, insufficient uniformity of matrix structure, etc., achieving small deformation, good stress relief effect, The effect of matrix tissue uniformity

Inactive Publication Date: 2017-06-09
赵敏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the internal stress of the workpiece can be removed to a certain extent by using the stress relief annealing process, the internal stress of the workpiece is not completely removed, and the matrix structure is not uniform enough, which makes the deformation of the workpiece difficult to control and denatured in the subsequent carburizing and quenching process of the processed gear. larger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0012] The manufacturing process of the carburized steel gear in this embodiment includes the following steps: forging → normalizing → machining → incomplete annealing → machining → carburizing and quenching → tempering → shot blasting, wherein the incomplete annealing process is in methanol gas Under the protection of the atmosphere, keep the temperature at 780°C for 2 hours, and cool to 720°C with the furnace, and then air cool. The other processes of the manufacturing process of the carburized steel gear in this embodiment are the same as those of the prior art, and will not be repeated one by one.

[0013] The manufacturing process of the carburized steel gear in this embodiment is due to the heating temperature of the incomplete annealing process being 780°C, which falls between the Ac1+(30-50)°C of the 20CrMo steel, which can make the crystal phase structure of the 20CrMo carburized steel Austenitization, in the subsequent air cooling process, the structure is transforme...

no. 2 example

[0015] The manufacturing process of the carburized steel gear in this embodiment includes the following steps: forging → normalizing → machining → incomplete annealing → machining → carburizing and quenching → tempering → shot blasting, wherein the incomplete annealing process is in methanol gas Under the protection of the atmosphere, keep the temperature at 775°C for 2 hours, and cool to 700°C with the furnace, and then air-cool. The other processes of the manufacturing process of the carburized steel gear in this embodiment are the same as those of the prior art, and will not be repeated one by one.

[0016] The manufacturing process of the carburized steel gear in this embodiment is due to the heating temperature of the incomplete annealing process being 775°C, which falls between the Ac1+(30-50)°C of the 20CrMo steel, which can make the crystal phase structure of the 20CrMo carburized steel Austenitization, in the subsequent air cooling process, the structure is transforme...

no. 3 example

[0017] The third embodiment The manufacturing process of carburized steel gears in this embodiment includes the following steps: forging → normalizing → machining → incomplete annealing → machining → carburizing and quenching → tempering → shot blasting, wherein the incomplete annealing process In order to protect the methanol gas atmosphere, keep the temperature at 790°C for 2 hours, and cool to 710°C with the furnace, and then air-cool. The other processes of the manufacturing process of the carburized steel gear in this embodiment are the same as those of the prior art, and will not be repeated one by one.

[0018] The manufacturing process of the carburized steel gear in this embodiment is due to the heating temperature of the incomplete annealing process being 790°C, which falls between the Ac1+(30-50)°C of the 20CrMo steel, which can make the crystal phase structure of the 20CrMo carburized steel Austenitization, in the subsequent air cooling process, the structure is tr...

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PUM

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Abstract

The invention discloses a manufacturing process of a 20CrMo carburizing steel gear, comprising the following steps: forging billet → normalizing → machining → incomplete annealing → machining → carburizing and quenching → tempering → shot blasting, wherein the incomplete annealing process Under the protection of the atmosphere, keep it warm for 2 hours at the temperature of Ac1+(30-50)°C, and cool it to 700-720°C with the furnace, then air-cool. The manufacturing process of the 20CrMo carburized steel gear of the present invention can not only eliminate the internal stress of the workpiece more thoroughly, but also improve the crystal phase structure of the workpiece, so that the matrix structure of the workpiece is more uniform, and the deformation in the subsequent carburizing and quenching process is smaller. Guarantee the processing accuracy of the workpiece.

Description

technical field [0001] The invention relates to a gear processing technology, in particular to a gear manufacturing technology using 20CrMo carburizing steel to make gears. Background technique [0002] Motorcycle gears are generally made of 20CrMo steel. During the cold working process of gears made of 20CrMo steel, in order to eliminate the internal stress of the workpiece, reduce the deformation of the workpiece and prevent the cracking of the workpiece, stress relief annealing at 500~600°C is usually used for treatment. Although the internal stress of the workpiece can be removed to a certain extent by using the stress relief annealing process, the internal stress of the workpiece is not completely removed, and the matrix structure is not uniform enough, which makes the deformation of the workpiece difficult to control and denatured in the subsequent carburizing and quenching process of the processed gear. larger. [0003] In view of this, the present invention proposes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14
CPCB23P15/14
Inventor 赵敏
Owner 赵敏
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