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Precision forging method for reverse idle gear of automobile gearbox

A technology of automobile gearbox and reverse gear idler, which is applied in the direction of wheels, vehicle parts, transportation and packaging, etc., can solve the problems of inability to achieve small rounded corners in precision forging, poor shifting smoothness, etc., and achieve tooth filling. Easy, unit pressure reduction, small equipment tonnage effect

Inactive Publication Date: 2011-10-19
CHONGQING CHUANGJING WARM FORGING FORMING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The corners are either small platforms or sharp corners during cutting, which cannot achieve the effect of precision forging to form small rounded corners, and the smoothness of shifting is not good.

Method used

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  • Precision forging method for reverse idle gear of automobile gearbox
  • Precision forging method for reverse idle gear of automobile gearbox
  • Precision forging method for reverse idle gear of automobile gearbox

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Embodiment Construction

[0023] Such as figure 1 , 2 , 3, 4, the automotive gearbox reverse gear idler precision forging forming process method of the present invention is characterized in that comprising the following steps:

[0024] 1. Select the appropriate raw material steel rod, grind the surface of the steel rod through centerless grinding, and then detect whether there is any crack on the surface, and then cut it into a material section that meets the requirements;

[0025] 2. Spray the lubricant on the material section and dry it; the lubricant and its spraying method, drying method, etc. are all existing technologies, and no further explanation will be made here;

[0026] 3. Heat the material section (billet) to 700-750°C in a heating device with a protective atmosphere, and warm forge the pre-forged billet on the warm forging press and in the pre-forging die. The pre-forged billet has a lead-in angle and Tooth shape; usually use medium frequency induction heating furnace for heating, heati...

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Abstract

The invention discloses a precision forging method for a reverse idle gear of an automobile gearbox. The precision forging method comprises the following steps of: shearing a raw material such as steel sticks into material sections as required; spraying lubricant on the material sections and drying; heating a blank to the temperature of between 700 and 750 DEG C, and warmly forging the blank intoa preforged blank with an opening angle and a tooth profile by a warm forging pressure machine; performing isothermal normalizing treatment on the preforged blank, sandblasting and performing surfacepolymer lubrication treatment; performing cold extrusion on the tooth profile on the preforged blank on a hydraulic machine; feeding into a tooth profile sizing die, and performing cold sizing on theopening angle; and feeding into an inverted cone die, and performing cold sizing on an inverted cone angle. By the method, the preforged blank is forged by a method of heating and warm forging under protective atmosphere, the tooth profile precision is higher than that of warm forging, and the surface roughness is high. The post process is divided into the following three steps of cold extrusion of the tooth profile, cold sizing of the opening angle and cold sizing of the inverted cone angle, so that the gradual improvement of the tooth profile precision is facilitated, and the chain effect brought by the tooth profile precision of the preforged blank is reduced. The efficiency is higher that of cutting, and materials, energy sources and time are saved.

Description

technical field [0001] The invention relates to a method for manufacturing a power transmission wheel in a gearbox of an automobile power transmission system, in particular to a method for manufacturing a reverse gear idler wheel of an automobile gearbox by precision forging. Background technique [0002] The reverse gear idler gear of the automobile gearbox is a key part in the automobile gearbox, which plays the role of transmitting torque during reverse gear. When the car shifts to the reverse gear, the main shaft gear transitions through the middle of the reverse idler gear, the main shaft teeth drive the reverse gear through the reverse idler gear, and transmits torque to the reverse gear, and the reverse gear rotates in the opposite direction to complete the reverse gear action of the car . The requirements of the reverse gear idler in the process: one is to run smoothly, and the other is to prevent out-of-gear. Therefore, the precision of the tooth shape of this p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/30
Inventor 胡斌高凤强敬勇冯杰
Owner CHONGQING CHUANGJING WARM FORGING FORMING
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