Long life rotating body with excellent fatigue strength and method of manufacturing the rotating body

A technology of fatigue strength and rotating body, applied in the field of long-life rotating body and its manufacturing

Active Publication Date: 2005-12-21
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, this prior art is based on the premise that ultrasonic vibration is applied to the high-temperature material just after welding, and there is no disclosure of the specific object and treatment range that is hit by the ultrasonic vibrator as proposed by the present invention.

Method used

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  • Long life rotating body with excellent fatigue strength and method of manufacturing the rotating body
  • Long life rotating body with excellent fatigue strength and method of manufacturing the rotating body
  • Long life rotating body with excellent fatigue strength and method of manufacturing the rotating body

Examples

Experimental program
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Effect test

Embodiment

[0049] The effects of the present invention will be described with reference to an example of an automobile wheel made of steel plate in the present invention.

[0050] For 13-inch wheels of automobiles, the treatment method was changed to compare the fatigue strength. In addition, the wheel disc used here is made of a plate with a thickness of 3.2mm and a strength of 690N / mm 2 And plate thickness 4.0mm, strength 330N / mm 2 processed from materials.

[0051] The fatigue test is carried out with a rotating bending moment (bending moment) load. The alternating speed is 700rpm, the bolt tightening torque is 98Nm, and the test torque is 1.47KNm.

[0052] In addition, as the initial crack before the treatment, a notch with a depth of 200 μm was artificially made at the end of the punched hole, and the corresponding part was cut out after the test, and the crack length was measured. The results are shown in Table 1.

[0053] No.

differentiate

steel

...

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Abstract

The present invention is to provide automobile wheels, pulleys, gears, track pulleys, etc., which have structures such as lap fillet joints, cold-formed parts, and punched holes that are subject to alternating loads due to rotation. The invention of the life-span rotating body, the long-life rotating body with excellent fatigue strength and its manufacturing method according to the present invention, the rotating body refers to a lap fillet weld joint formed by overlapping two metal plates and then welding the ends, For rotating bodies such as cold-formed parts and punched holes, ultrasonic shock treatment is applied to any part of them to form indentations or smooth the surface to relieve tensile residual stress.

Description

technical field [0001] The present invention relates to a long-life rotating body excellent in fatigue strength using a metal plate and a manufacturing method thereof. For example, it relates to a long-life rotating body with excellent fatigue strength and a structure such as lap fillet weld joints, cold-bending processing parts, punching holes, etc. its method of manufacture. Background technique [0002] Rotating bodies such as automobile wheels, pulleys, gears, and track pulleys, which are subject to alternating loads due to rotation, have weaknesses in metal fatigue such as lap fillet weld joints, cold-formed parts, and punched holes. [0003] As methods for improving the weld shape and fatigue strength by post-processing after welding, cold bending, stamping, etc., the methods used in the past are: ① grinding, ② TIG trimming, ③ shot peening, ④ Hammer peening. These methods are methods of modifying the shape of the end portion of the welded edge that becomes the stres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/00B23K31/02B60B3/04C21D7/04C21D7/06
CPCB23K31/02B60B3/002B60B3/044C21D7/04B23K31/00B60B3/04
Inventor 富永知德高木优任
Owner NIPPON STEEL CORP
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