Forging method of automotive eccentric shaft

An eccentric shaft, automobile technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of potential safety hazards, poor corrosion resistance, short service life, etc., to reduce energy consumption, the overall structure is scientific and reasonable, and the power consumption is reduced. Effect

Inactive Publication Date: 2013-03-27
CHANGLI FORGING
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AI Technical Summary

Problems solved by technology

General manufacturers in the industry just spray the anti-rust paint directly or without shot blasting during surface treatment, and then paint the black paint after the anti-rust paint is dry. This kind of coating has poor corrosion resistance, short service life, and potential safety hazards.

Method used

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  • Forging method of automotive eccentric shaft

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Effect test

Embodiment Construction

[0028] A method for forging an automobile eccentric shaft, comprising the following steps:

[0029] a. Pouring cylindrical billet step

[0030] The weight percent of the chemical composition in the cylindrical blank is: C 0.23-0.40%, Mn 1.5-2.3%, Si 0.6-0.9%, Zirconium 0.07-0.15%, Cr 0.8-2.0%, W 0.42-0.8%, Cd 0.4-1.2 %, Cu 0.4~0.52%, P≤0.043%, S≤0.030%, the balance is Fe and unavoidable inclusions; the temperature of the cast body is reduced to 350°C, then heated to 670-760°C, and kept for 3 -5 hours, cool the furnace to 300°C, hold for 4 hours, then heat to 650-760°C, hold for 17 hours, cool to 400°C at 45°C / hour, then cool to 140°C at 25°C / hour;

[0031] b. Forging steps

[0032] 1. Choose a round steel with a diameter of 30mm, use a shearing machine to cut the material, and the length of the blank after shearing is 120.3mm;

[0033] 2. Put the blank in step 1 into an intermediate frequency heating furnace for heating. The initial forging and final forging temperatures ar...

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Abstract

The invention discloses a forging method of an automotive eccentric shaft, which comprises the steps of: a, pouring a cylindrical blank which contains the chemical components of, by weight percent: 0.23-0.40% of C, 1.5-2.0% of Mn, 0.6-0.9% of Si, 0.07-0.15% of Zr, 0.8-2.0% of Cr, 0.42-0.8% of W, 0.4-1.0% of Cd, 0.4-0.50% of Cu, equal to or less than 0.040% of P and equal to or less than 0.030% of S, cooling the poured blank to 300 DEG C, then heating to 650-760 DEG C, thermally insulating for 3-5 hours, furnace cooling to 300 DEG C, thermally insulating for 4 hours, heating again to 650-760 DEG C, thermally insulating for 17 hours, cooling to 400 DEG C at cooling speed of 50 DEG C/hour and then cooling to 140 DEG C at cooling speed of 20 DEG C/hour; b, forging: 1, selecting round bar steel with diameter of 30 and blanking through a shear, with the length of the sheared rough blank is 70.3mm; and 2, heating the rough blank obtained in above step into a medium frequency heating furnace at 1,120-1,180 DEG C for 3.6min. The forging method is good for large scale industrial production of the automotive eccentric shafts, and reduces the problems of slag inclusion and short shot in the forging process. The mechanical property of the automotive eccentric shaft is further improved, material consumption of the eccentric shaft is reduced and the service life of a die for forging the eccentric shaft is prolonged.

Description

technical field [0001] The invention relates to a forging method of an automobile eccentric shaft. Background technique [0002] As an important part of automobile suspension components, the eccentric shaft can improve the roll angle stiffness of the suspension and adjust the ratio of the front and rear suspension angle stiffnesses to ensure that the car has good driving stability, thereby ensuring the safety, comfort and ride comfort of the car . General manufacturers in the industry just spray the anti-rust paint directly or without shot blasting during the surface treatment, and then paint the black paint after the anti-paint is dry. This kind of coating has poor corrosion resistance, short service life and potential safety hazards. Contents of the invention [0003] The purpose of the present invention is to provide a forging method of an automobile eccentric shaft, which is beneficial to large-scale industrial production, and reduces the phenomenon of contaminati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02C22C38/38C21D1/18C21D9/00
Inventor 杨奎琦陈正义张斌
Owner CHANGLI FORGING
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