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A process for improving the fatigue life of automobile half shaft

An automobile half shaft and process method technology, which is applied in the directions of axles, wheels, vehicle parts, etc., can solve the problems of stress concentration at the spline, and achieve the effect of overcoming the stress concentration, enhancing the strength, and reducing the cost of after-sales three guarantees.

Active Publication Date: 2017-02-08
南京东华传动轴有限公司
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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a process method for improving the fatigue life of the automobile half shaft, which can overcome the shortcoming of relatively concentrated stress at the spline of the existing automobile half shaft processing technology, and improve the fatigue life of the automobile half shaft. torsional fatigue performance

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  • A process for improving the fatigue life of automobile half shaft
  • A process for improving the fatigue life of automobile half shaft

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Embodiment

[0020] A kind of processing method of the present invention improves the fatigue life of automobile axle shaft, and the steps are as follows:

[0021] Firstly, the bar stock is forged to form an automobile semi-shaft blank. Then the semi-shaft blank of the automobile is subjected to quenching and tempering treatment, and the quenching and tempering hardness is HB229-269. The specific modulation process parameters are: quenching temperature is 840-860°C, quenching medium is oil cooling; tempering temperature is 600-640°C, tempering and heat preservation The time is 1 hour, and the cooling medium is air. Taking the central holes at both ends of the modulated automobile half-shaft blank as a positioning reference, the outer circle is turned according to the size requirements to obtain the automobile half-shaft. Carry out spline 2 milling on the half shaft of the car, the fillet of the spline tooth root 21 is R0.25mm, and increase the fillet of the spline tooth root 21 by grindin...

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Abstract

The invention provides a technological method for prolonging the fatigue life of an automobile axle shaft. The technological method comprises the following steps: 1) forging; 2) blank quenching and tempering treatment; 3) lathe machining; 4) spline milling, to be specific, increasing the tooth root fillet of a spline from R0.25 mm to R0.45 mm; 5) medium-frequency hardening; 6) tempering; 7) cold treatment, to be specific, performing heat preservation for 50 hours in an incubator at minus 20-minus 30 DEG C; 8) facing and connection hole drilling. The technological method can overcome the defect that more stress is concentrated at a spline in the conventional automobile axle shaft machining technological method. Meanwhile, the cold treatment procedure is added to enhance the strength of the spline part and prolong the torsional fatigue life of the axle shaft.

Description

technical field [0001] The invention relates to a processing method of an automobile half shaft, in particular to a process method for improving the fatigue life of an automobile half shaft. Background technique [0002] The torsional fatigue life of the automobile half shaft is a key performance index of the automobile half shaft, and the quenching heat treatment of the half shaft can greatly improve the torsional fatigue life of the automobile half shaft. As disclosed in CN1433900A, "a kind of improved heavy-duty steam The strength and toughness of the half shaft and the process method of the depth of the hardened layer", Existing automotive half shaft machining process: rough quenching and tempering treatment: Quenching Fire temperature 850-890°C; heating time 140-160 minutes; quenching medium diesel; tempering temperature 560-620°C; 180 minutes; cooling medium: water; →turning→spline milling→intermediate frequency quenching: Quenching temperature: 870~900℃, quen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/14B60B35/14
Inventor 王安祥黄永庆岳霞
Owner 南京东华传动轴有限公司
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