Method and device for improving laser shock forming property of metal plate material

A metal sheet, laser shock technology, applied in laser welding equipment, metal processing equipment, welding equipment and other directions, can solve problems such as easy to break, achieve the effect of low manufacturing cost, flexible processing, and improve reasonable distribution

Inactive Publication Date: 2009-07-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that it is easier to break through when the metal sheet is impacted obliquely by the laser compared to the

Method used

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  • Method and device for improving laser shock forming property of metal plate material
  • Method and device for improving laser shock forming property of metal plate material
  • Method and device for improving laser shock forming property of metal plate material

Examples

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example 1

[0028] figure 2 Shown are the schematic diagrams when the laser is vertically and obliquely incident and the cross-sectional view when microcracks are generated after the impact of the sheet. With laser energy of 18J, spot diameter of 8mm, die aperture of 20mm, laser incident direction 16 was adjusted, and the size of 40mm×40mm×0.3mm aluminum alloy sample 17 was subjected to laser vertical impact and oblique impact respectively to generate microcracks. Through the measurement, it can be known that the forming limit depth of the sheet metal during laser vertical impact and oblique impact is 4.31mm and 3.75mm respectively, which means that the sheet metal can obtain a greater forming limit depth under the laser vertical impact. Therefore, in the process of laser impacting the sheet, the incident direction of the laser is always kept consistent with the normal direction in the area to be impacted, which can improve the forming performance of the sheet.

[0029] image 3 Shown ...

example 2

[0032] Figure 5Shown is the impact distribution diagram of two rows of light spots for laser impacting a 17 "V"-shaped piece of sheet material. Die 12 adopts " V " shape die. The forming of the metal laser shock "V" shape involves multi-point forming and curved surface forming. If the direction is not changed during the impact process, the forming effect of the sheet will be seriously affected. That is to say, if the energy is small, the deformation may be small, and the energy is large, which may cause the sheet to break. When the sheet material is impacted at multiple points, as the "V" shape rushes to the "n" point 20, to the "n+1" point 21, the sheet material has been deformed in the last stage. At this time, if it acts directly on the sheet, it must not be along the normal direction in the impact area, which is not conducive to the impact forming of the "V" shape. This method can be used at any impact point when the sheet is subjected to multi-point impact. , the spec...

example 3

[0034] Such as Figure 8 As shown, when the curved surface part 22 is impacted, for different impact areas of the curved surface part, the normal direction 18 of different impact areas is obtained through the ATOS scanner. The incident direction of the beam is consistent with the normal direction of the curved sheet, which improves the formability of the curved sheet. In the forming process, on the one hand, it can prevent the sheet from breaking in advance; on the other hand, it can reduce the number of impacts in the precise forming process of the sheet, and make full use of the force effect of the laser shock wave, so that the sheet is formed at a lower impact frequency. In less cases, better results can be obtained and costs can be reduced.

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Abstract

The invention relates to the field of laser machining and manufacturing, in particular to a method and a device for improving forming performance of a metal sheet material by laser and impact to improve the forming performance of the sheet material, realize accurate forming of complex shape of the sheet material and obtain largest forming limit, and is particularly suitable for material forming which the prior method is difficult to form or cannot form basically. When the method adopts a large-power pulse laser (4) to carry out several impact on the sheet material or impact on a curved surface part by an outer optical path system, the method feeds back specific information on the sheet material shape prescanned by a feedback system device (3) to a central control processor (1); the information is input to a CAD software for carrying out curved surface modeling; the normal direction is determined; and computer programming controls the rotation of a multiaxial coordinate station (13) and ensures that the incident direction of laser beans is always consistent with the normal direction of the sheet material so as to improve the forming performance and obtain the maximal forming effect. Simultaneously, the method improves the distribution of residua stress field on the surface of the sheet material, improves the capacity for resisting stress corrosion, and prolongs fatigue life.

Description

technical field [0001] The present invention relates to the field of laser processing and manufacturing. More specifically, the present invention is a method and device for improving the performance of laser impact forming of sheet metal. It is suitable for high-efficiency, complex and precise forming of thin metal plates, and is especially suitable for forming difficult to form by conventional methods. Or materials that cannot be formed at all, such as magnesium alloys, titanium alloys, etc. Background technique [0002] As the main method of sheet metal forming, plastic forming of sheet metal has occupied a very important position in the entire national economy and is widely used in aerospace, shipbuilding, automotive panels, electronics, instruments and other production industries. At present, there are many methods for plastic forming of metal sheets at home and abroad, including stamping, explosive forming, shot peening, laser thermal stress forming and laser impact for...

Claims

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Application Information

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IPC IPC(8): B23K26/14B23K26/00B23K26/18
Inventor 姜银方王飞张永康叶云霞王永良鲁金忠尤建任爱国顾永玉
Owner JIANGSU UNIV
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