Precision forging method for reverse idle gear of automobile gearbox
A technology for automotive gearboxes and reverse gear idlers, which is applied to wheels, vehicle parts, transportation and packaging, etc. It can solve the problems of poor shifting smoothness, inability to achieve precision forging small rounded corners, etc., and achieve tooth shape filling Easy, small equipment tonnage, high mold life effect
Inactive Publication Date: 2013-01-30
CHONGQING CHUANGJING WARM FORGING FORMING
View PDF5 Cites 1 Cited by
- Summary
- 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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0023] like 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, heat...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a precision forging forming process for a reverse gear idler wheel of an automobile gearbox. The raw material steel bar is cut into material sections meeting requirements; the material section is sprayed with a lubricant and dried; the blank is heated to 700-750°C, Warm forging on a warm forging press to form pre-forged blanks with lead-in angles and tooth profiles; treat pre-forged blanks with isothermal normalizing treatment, sand blasting, and surface polymer lubrication; cold-extrude pre-forged blanks on hydraulic presses ; Put it into the tooth shape finishing mold, and cold finish the lead-in angle; put it into the inverted cone mold, and cold finish the inverted cone angle. In the method of the present invention, the preform is forged by heating and warm forging in a protective atmosphere, which has higher profile precision and better surface roughness than hot forging; The three processes of finishing the reverse taper angle are conducive to gradually improving the tooth shape accuracy and reducing the "hereditary" effect brought about by the pre-forged billet tooth shape accuracy; it is more efficient than cutting, saving materials, energy and time.
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 par...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/30
Inventor 胡斌高凤强敬勇冯杰
Owner CHONGQING CHUANGJING WARM FORGING FORMING