Automobile transmission reverse gear manufacturing process

A technology of automobile transmission and reverse gear, which is applied in the manufacture of tools, wheels, vehicle parts, etc., can solve the problems of high requirements for forging equipment and dies, long production cycle, high production cost, etc. Good effect of superheat oxidation and plastic deformation

Active Publication Date: 2011-11-30
JIANGSU PACIFIC PRECISION FORGING
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AI Technical Summary

Problems solved by technology

Compared with the hot precision forging process, the cold precision forging forming process is complex and has many processes, and has high requirements for forging equipment and molds
Chinese patent 200510038314.1 discloses a "Split Forging Process for Automobile Reverse Gear". This patented technology shares 15 processes to realize the cold precision forging gear forming process. Due to the long production cycle, the production cost is high, which seriously restricts the cold precision forging Promotion and application of technology

Method used

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Embodiment Construction

[0010] (1) Cutting: select the bar material according to the forging design drawing, and cut it with a band saw;

[0011] (2) Blank making: car end face, outer circle, remove material surface defects;

[0012] (3) Shot blasting treatment: remove the turning tool marks on the surface of the billet, and reduce the roughness Ra value;

[0013] (4) Warm forging forming: heat the blank to 775±10°C, put it into a mold that has been heated to 200±10°C, pre-forge it into a billet suitable for the installation of the final forging die, and then extrude it from the final forging die. The metal flows axially and radially to form the teeth gradually;

[0014] (5) Annealing: send the blank formed by warm forging into the annealing furnace for isothermal spheroidizing annealing treatment, so that the structure of the blank is uniform and softened, and its hardness is 162-167HBW;

[0015] (6) Shot blasting: remove the oxide layer on the surface of the billet;

[0016] (7) Lubrication trea...

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PUM

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Abstract

The invention discloses a manufacturing process for a reverse gear of an automobile transmission, which is composed of the following steps: blanking → billet making → shot blasting treatment → warm forging → annealing → shot blasting treatment → lubrication treatment → cold finishing forming → turning processing → Shaving processing → Carburizing treatment. The difference between the warm forging forming process in the present invention and the hot precision forging process and the cold precision forging process lies in the heating temperature of the billet, which is 750-800°C. At this temperature, the billet just reaches the hypereutectoid reaction isotherm. The material structure is just transformed into austenite and sent to the preheated die for forging and pressing. The lubricating treatment process is to brush the polymer lubricant on the outer surface of the blank. The cold finish forming process is to use a standard tooth die to correct the teeth formed by warm finish forging under normal temperature conditions. The invention comprehensively applies the advantages of the hot precision forging process and the cold precision forging process, and is especially suitable for the mass production process of the reverse gear of the automobile transmission.

Description

technical field [0001] The invention relates to a gear manufacturing process, in particular to a reverse gear manufacturing process of an automobile transmission, and belongs to the technical field of mechanical processing. Background technique [0002] The reverse gear of automobile transmission is a moving part that transmits variable load and high torque, and requires high manufacturing precision and tooth surface strength. There are two types of manufacturing processes in the prior art that can realize the industrialized production of automotive transmission reverse gears, one is the traditional cutting process, and the other is the precision forging forming process. The cutting process is simple, easy to realize production, and the precision of the processed gear tooth surface is high, but the strength of the tooth part is the same as that of the base material. The gear manufactured by this process has low strength and is prone to tooth damage. At present, the reverse ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/14B21J1/06B21J3/00B21K1/30B21K29/00
Inventor 申加圣陶立平徐爱国成国发夏汉关赵红军董义
Owner JIANGSU PACIFIC PRECISION FORGING
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