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Process for manufacturing backward gear of automobile gearbox

A technology for automotive transmissions and reverse gears, which is applied in the manufacture of tools, wheels, and vehicle parts, which can solve the problems of high requirements for forging equipment and molds, long production cycles, and high production costs, and achieve high gear forming accuracy and avoid Good effect of overheating oxidation and plastic deformation

Active Publication Date: 2010-04-21
JIANGSU PACIFIC PRECISION FORGING
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  • Abstract
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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

[0009] The present invention will be further described below through working procedure.

[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 billet formed by warm forging into the annealing furnace for isothermal spheroidizing annealing treatment, so that the billet structure is uniform and softened, and its hardness is 162-167;

[0015] (6) Shot blasting: ...

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Abstract

The invention discloses a process for manufacturing a backward gear of an automobile gearbox, comprising the following procedures of blanking, blank forming, shot blasting, warm forging forming, annealing, shot blasting, lubricating, cold finished shaping, turning, gear shaving and carburizing. In the invention, the difference between the warm forging forming, a hot precise forging and a cold precise forging is the heating temperature of the blank, the heating temperature is 750-800 DEG C, under the temperature, the blank just exceeds eutectoid reaction isothermal line, after the material structure is just transformed into Austenite, the blank is sent to the preheated mould to carry out a forging shaping process. The lubricating procedure is that the outer surface of the blank is coated with a macromolecular lubricant. The clod finished shaping procedure is that a standard gear mould is used for correcting the gear formed by the warm forging forming procedure at the normal temperature. In the invention, the advantages of the hot precise forging and the cold precise forging are comprehensively applied, and the process is especially suitable for the technique for manufacturing the backward gear of the automobile gearbox in large scale.

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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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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