Process for manufacturing metal member, and structural member

一种制造方法、金属部件的技术，应用在制造工具、金属加工设备、运输和包装等方向，能够解决效率不好等问题，达到低成本、降低制造工时和制造成本、减少制造工时的效果

Inactive Publication Date: 2009-04-01
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But usually the chamfering and rounding of corners are done by manual operation, the efficiency is not good

Method used

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  • Process for manufacturing metal member, and structural member
  • Process for manufacturing metal member, and structural member
  • Process for manufacturing metal member, and structural member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and Embodiment 2

[0053] A plate-shaped aluminum alloy material (7050-T7451, size 19mm×76mm×2.4mm) is used as a test piece, and a projection material composed of alumina / silica ceramic particles with an average particle size (highest frequency diameter) of 50 μm or less is used. The injection pressure is 0.4MPa, and the projection time is 30 seconds, and the single surface is subjected to shot peening treatment.

[0054] Two types of aluminum alloy materials having different surface roughness were prepared as the aluminum alloy material before the shot peening treatment. In Example 1, an aluminum alloy material with a surface roughness of 1.2 μm before shot peening was used, and in Example 2, an aluminum alloy material with a surface roughness before shot peening of 2.9 μm was used.

[0055] As the shot peening treatment device, a gravity type fine particle launcher (Pneumatic shot blasting machine manufactured by (Japan) Fuji Seisakusho Co., Ltd. - model P-SGF-4ATCM-401) was used.

[0056] Af...

Embodiment 3 and Embodiment 4

[0065] In addition to replacing the test piece with a plate-shaped titanium alloy material (Ti-6Al-4V (annealed material), size 19mm × 76mm × 2.4mm), then it is the same as embodiment 1 and embodiment 2, and carries out embodiment 3 and embodiment 4 shot peening treatment.

[0066] Two types of titanium alloy materials having different surface roughness were prepared as the titanium alloy material before the shot peening treatment. In Example 3, a titanium alloy material with a surface roughness of 1.64 μm before shot peening was used, and in Example 2, a titanium alloy material with a surface roughness before shot peening of 3.2 μm was used.

[0067] The shot peening treatment conditions of embodiment 3 and embodiment 4, the surface roughness of the test piece before and after the shot peening treatment, and the compressive residual stress, surface roughness, deformation and fatigue life after the shot peening treatment are shown in the table 1. The fatigue life was evaluat...

Embodiment 5

[0075] The same shot peening treatment as in Example 3 was performed on the hole portion of the test piece made of a titanium alloy (Ti-6Al-4V (annealed material)) perforated flat plate. No chamfering or rounding of the corners of the hole is performed before shot peening. After the fatigue test, the fatigue fracture surface was observed with an electron microscope. Figure 6 It is an electron micrograph of the fatigue cross-section of the test piece of Example 5. The arrows in the figure indicate the starting point of fatigue failure.

[0076] From Figure 6 It can be seen from the electron micrograph of Example 5 that there is a starting point of fatigue fracture from the inner surface of the hole of the test piece to the inside of about tens of μm.

[0077] Table 2 shows the results of a fatigue test (tensile-tensile fatigue test, stress ratio R=0.1) using the above-mentioned effective flat plate. It can be seen that it has nothing to do with the treatment of not implem...

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Abstract

Manufacturing of metal members, such as structural members for use in aircraft, automobile, etc., involving shot peening treatment of a surface of metal material, in which the fatigue characteristics can be enhanced without any marked change to the surface roughness of metal material between before and after shot peening treatment. Shot peening treatment of a surface of metal material is carried out with the use of a bombardment medium of 200 [mu]m or less average particle diameter so that on the surface of metal material, the ratio of surface roughness after bombardment operation to surface roughness before bombardment operation is in the range of 0.8 to 1.5.

Description

technical field [0001] The invention relates to a method of manufacturing metal parts and structural parts having improved fatigue properties. Background technique [0002] Shot peening is known as a surface modification method for improving the fatigue strength of metal materials such as structural parts used in aircrafts and automobiles (see Non-Patent Document 1). The so-called shot peening treatment is, for example, spraying countless particles (projection materials) with a particle size of around 0.8mm and compressed air together, and improving the hardness of the surface of the metal material by beating on the surface of the metal material, forming a compressed residue at a certain depth. Stressed layer approach. [0003] As other methods for improving the fatigue strength of metal materials, technologies such as sheet-shaped object knocking (Frapping) and cold working (Cold wa-ku) are also used. [0004] Non-Patent Document 1: T. Dorr and four others, "Influence of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/06B24C1/10
CPCB24C11/00B24C1/10C21D7/06Y10T29/479Y10T428/12993
Inventor 小栗和幸关川贵洋井上明子
Owner MITSUBISHI HEAVY IND LTD
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