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Transition processing method for edge of laser shock enhanced region

A technology of laser shock strengthening and processing method, which is applied in the special treatment of the edge area of ​​laser shock strengthening, and in the field of laser processing, which can solve the problems of reducing the fatigue life of parts and achieve the effect of reducing the amplitude of tensile stress

Inactive Publication Date: 2012-04-11
BEIJING AERONAUTICAL MFG TECH RES INST
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  • Claims
  • Application Information

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Problems solved by technology

These residual tensile stresses will reduce the fatigue life of parts, and the residual tensile stress distribution area becomes a new "dangerous point", especially when the equilibrium tensile stress distribution extends to the stress concentration area

Method used

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  • Transition processing method for edge of laser shock enhanced region
  • Transition processing method for edge of laser shock enhanced region
  • Transition processing method for edge of laser shock enhanced region

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Embodiment Construction

[0025] The technical scheme of the present invention will be described in further detail below in conjunction with accompanying drawing and embodiment:

[0026] see figure 1 As shown, the part 1 is laser shock strengthened with a square laser strengthening spot 2 to form a strengthened area 3, and the unstrengthened surface outside the edge 4 of the strengthened area forms a balanced tensile stress area, the distribution range of the tensile stress area and the amplitude of the tensile stress and The process parameters of strengthening zone 3 are closely related. This part of the area is the outer area 5 to be processed by adopting the technical solution of the present invention, and the outer areas 5 in rows are transitioned from the edge 4 to the outside by using the laser transition spot 6 . The transition treatment method of the edge of the laser shock strengthening area described in the present invention is to start from the edge 4 of the laser shock strengthening area 3...

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Abstract

The invention discloses a transition processing method for an edge of a laser shock enhanced region. The method is characterized by comprising the following step of: performing transition processing on an outer region of the edge by using laser transition light spot from the edge of the laser shock enhanced region, wherein the power density of the laser transition light spot is decreased as the increase in the distance with the edge relative to laser enhancement light spot acting on the laser shock enhanced region. Compared with the prior art, the technical scheme has the advantages that: plastic deformation and residual stress of the laser shock enhanced edge region are in uniform transition, tensile stress can be redistributed, the tensile stress on the peripheral surface of the shock region is reduced to the minimum, and even the peripheral surface does not have the tensile stress.

Description

technical field [0001] The invention relates to a transitional treatment method for the edge of a laser shock strengthening area, which belongs to the laser processing technology and relates to the special treatment of the edge area of ​​laser shock strengthening. Background technique [0002] Laser shock strengthening technology uses short pulse (8 ~ 30ns) high power density (> 1GW / cm 2 ) irradiates the surface of the material, and the absorbing layer medium (black paint, aluminum foil, etc.) pre-coated on the surface of the part is vaporized and ionized to form a high-temperature and high-pressure plasma. The plasma continues to absorb laser energy and expands rapidly to generate a high-pressure shock wave. During the laser shock peening process, it is necessary to apply a uniform water layer or other methods on the surface of the part to restrict the free expansion of the plasma and increase the pressure amplitude of the shock wave. When the shock wave pressure exceed...

Claims

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Application Information

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IPC IPC(8): C21D1/09
Inventor 曹子文邹世坤车志刚许海鹰
Owner BEIJING AERONAUTICAL MFG TECH RES INST
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