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A die forging method for an output shaft of a gearbox

A technology for output shafts and gearboxes, applied in forging/pressing/hammer devices, forging/pressing/hammering machinery, mechanical equipment, etc., can solve the problems of easy fracture, short service life, incomplete heat treatment, etc. Easy to break and long service life

Active Publication Date: 2017-06-20
HANGZHOU ADVANCE FORGING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a die forging method for the output shaft of a gearbox, which mainly solves the problem of incomplete heat treatment and the stress in the output shaft when the forging method existing in the prior art heats the output shaft with multiple bosses. It will be heated unevenly, resulting in short service life and technical problems such as breakage

Method used

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  • A die forging method for an output shaft of a gearbox
  • A die forging method for an output shaft of a gearbox

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Embodiment

[0023] Embodiment: A kind of die forging method of gear box output shaft of this example, its steps are:

[0024] a. 20MnCr5 alloy steel billet is selected, the composition and percentage of alloy steel are: carbon 0.17-0.22%, silicon ≤ 0.12%, manganese 1.10-1.50%, phosphorus ≤ 0.035%, sulfur 0.020-0.035%, chromium 1.00-1.30%, copper ≤ 0.20%, aluminum 0.020-0.055%, the matrix is ​​iron, its low-power structure is generally loose, the center is loose, and the segregation is ≤3 grades, the banded structure is ≤3 grades, the purity K3 (O)<30, austenite crystal The particle size is not more than 5.0 grade, and the end hardenability J10=33-39; the blank is cut with a semi-automatic band sawing machine, and the diameter of the blank is 100mm;

[0025] b. Put the billet into the natural gas heating furnace for heat treatment: first heat the billet to 1170°C, then rapidly cool down to 1000°C, the cooling rate is 5°C / s, then heat the billet to 1200°C, and then rapidly cool down to 11...

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Abstract

The invention relates to a die forging method of motor vehicle parts, in particular to a die forging method of an output shaft of a gearbox. It is mainly to solve the existing forging method in the prior art. When heating the output shaft with multiple bosses, the heat treatment will be incomplete, and the stress in the output shaft will be heated unevenly, resulting in a short service life and prone to fracture. technical problems. The present invention selects 20MnCr5 alloy steel billet, cuts it with a semi-automatic band sawing machine, puts the billet into a natural gas heating furnace for heat treatment, puts the heated billet into an electro-hydraulic die forging hammer press, and uses a forging die to carry out die forging. The output shaft blank after die forging is put into the isothermal normalizing furnace for high-temperature normalizing treatment first, and the output shaft blank after normalizing treatment is shot peened until the surface of the output shaft blank is free of defects and scales. Carry out rough turning and fine turning, and finally produce the output shaft of the finished gearbox.

Description

technical field [0001] The invention relates to a die forging method of motor vehicle parts, in particular to a die forging method of an output shaft of a gearbox. Background technique [0002] At present, the air hammer die forging is used to produce the output shaft of the reducer. The production process is as follows: purchase raw materials; Forging with active tire molds, cooling to room temperature in the air; rough machining of machine tools; quenching and tempering heat treatment; finishing machining of machine tools; finished products. A Chinese patent discloses a forging method for an output shaft for a reducer (publication number: CN102990289A), which includes the following steps: a. Casting a cylindrical blank: the weight percentage of each chemical component in the cylindrical blank is: carbon 0.26-0.36 %, manganese 1.05-1.50%, silicon 0.35-0.60%, phosphorus ≤0.034%, sulfur ≤0.0360%, chromium 0.450-0.65%, molybdenum 0.003-0.006%, nickel 0.001-0.025%, vanadium 0....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02B21K1/06B21J13/02B23P15/14
Inventor 祝利烽徐冠军施建平姚利红石慧
Owner HANGZHOU ADVANCE FORGING
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