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Shunting forging process for automobile reverse gear

A reverse gear and process technology, applied in the field of machining, can solve the problems of increasing the forging force, decreasing the life of the die, and increasing the forging stress, and achieving the effect of reducing the requirements and improving the life of the die.

Active Publication Date: 2008-09-17
JIANGSU SUNWAY PRECISION FORGING
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the processing of reverse gear in my country's automobile industry is mainly cold heading and forging, and its main defect is: due to the poor metal flow conditions at the sharp corners of the tooth top when the gear is formed by cold heading forging, the forging force alone is increased. The method cannot effectively improve the filling effect of the tooth tip
The negative effect of increasing the forging force is that the life of the die will be greatly reduced.
The increase of forging stress also increases the elastic deformation of the mold, and finally reduces the tooth profile accuracy of forgings
Due to the characteristics of closed-die forging, when the blanking accuracy of the tooth blank is low, a small amount of blank volume exceeding the standard will cause a sharp rise in forging stress, which will eventually lead to the failure of the mold

Method used

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Embodiment Construction

[0007] specific implementation plan

[0008] 1. Blanking, using materials slightly smaller than the small diameter of the gear for sawing and blanking; 2. Blank making, turning the outer circle, removing material surface defects; 3. Shot blasting; 4. Phosphorus, saponification treatment; 5. Upsetting, The outer circle reaches the small diameter of the gear; 6. Drilling, drilling the inner hole until it is slightly smaller than the finished product size; 7. Boring, chamfering, boring to the finished product size, and the chamfering is C1; 8. Spheroidizing annealing, controlled spheroidizing annealing The spheroidization rate of the post-forging is 60%, and the hardness is not higher than 80HRB; 9. Shot blasting; 10. Phosphorus, saponification treatment, after saponification, scald with hot water to remove excess soap; 11. Preforming, keep the mold cavity clean , the mold adopts a shunt port with a small diameter of about one-half of the gear; 12. Phosphorus, saponification trea...

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Abstract

The present invention relates to the production process of automobile reverse gear and belongs to the field of machining technology. In order to improve the metal flowability during gear producing forging process, one shunting opening is formed in the forming part of blank or mold. During forging, partial material flows to the shunting opening while the material fills the mold cavity, and small amount of material is held in the shunting opening to avoid the abrupt increase in forging stress. What is more important is that the reasonable design of the shunting path makes the metal flow in the forging process for well filling of the sharp corner in the tooth tip to obtain good tooth form with high filling degree at relatively small forming stress.

Description

Technical field [0001] The invention relates to the production and processing technology of reverse gears used in automobiles, in particular to the technology of processing gears by cold precision forging, and belongs to the technical field of mechanical processing. Background technique [0002] At present, the processing of reverse gear in my country's automobile industry is mainly cold heading and forging, and its main defect is: due to the poor metal flow conditions at the sharp corners of the tooth top when the gear is formed by cold heading forging, the forging force alone is increased. The method cannot effectively improve the filling effect of the tooth tip. The negative effect of increasing the forging force is that the life of the die is greatly reduced. The increase of forging stress also increases the elastic deformation of the mold, and finally reduces the tooth profile accuracy of the forging. Due to the characteristics of closed-die forging, when the blanking ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/04C21D1/32
Inventor 徐祥龙龚爱军靳天龙施卫兵汤晓东
Owner JIANGSU SUNWAY PRECISION FORGING
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