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Reverse laser forming method for single-segment arc surface of metal sheet

A technology of laser forming and sheet metal, which is applied in metal processing equipment, feeding devices, manufacturing tools, etc., can solve the problem of poor smoothness effect of arc surface, does not derive the mathematical relationship of the curvature radius of arc surface, and does not consider arc problems such as the effect of surface smoothness, to achieve the effect of ensuring smoothness

Inactive Publication Date: 2020-08-07
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Document 1 "Mehdi S, Hosein M Experimental and numerical investigation of laser forming of cylindrical surfaces with arbitrary radius of curvature [J]. Alexandria Engineering Journal, 2016, 55(3)." After research, the relationship between the length of the plate, the radius of curvature of the arc surface, the number of scanning lines and the angle of a single scanning line is obtained, and the number of scanning lines and the angle of a single scanning line are directly set to complete a circle with a specific curvature radius The arc surface is formed, but the influence of the scanning line spacing on the smoothness of the arc surface after forming is not considered in this paper. The large scanning line spacing used leads to poor smoothness of the arc surface. At the same time, in the known arc surface arc In the case of long and radius of curvature, there is no method to reversely solve the number of scans and the bending angle of single-scan
[0004] Document 2 "Li Bin. Copper-steel laminated plate laser bending forming experiment and material properties [D]. Dalian University of Technology, 2019." Using the optimal processing parameters obtained from the orthogonal experiment, the copper-steel laminated plate was arc-shaped Forming tests, through a large number of tests, it is found that the scanning line spacing has an important influence on the smoothness of the forming arc surface. When the scanning line spacing is less than 1.5 times the spot diameter, the obtained arc surface is relatively smooth. When the scanning line spacing is greater than 1.5 times the spot diameter When , the smoothness of the arc surface decreases and there are obvious edges and corners on the scanning line. It is concluded that the radius of curvature of the arc surface increases with the increase of the scan line spacing, and decreases with the increase of the single-track bending angle, but there is no Deduce the mathematical relationship between the curvature radius of the arc surface, the scanning line spacing and the single-track bending angle

Method used

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  • Reverse laser forming method for single-segment arc surface of metal sheet
  • Reverse laser forming method for single-segment arc surface of metal sheet
  • Reverse laser forming method for single-segment arc surface of metal sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: A single-segment circular arc surface sample is formed by laser bending of a metal sheet.

[0025] (1) Use a shearing machine to cut a metal composite plate with a thickness of 1mm into a rectangular sample with a width of 50mm and a length of 77.8mm. The radius of curvature of the arc surface is R=60mm, the central angle θ=60°, and the arc length corresponds to The length of the plate is L=62.8mm, and the width of the flat plate for extra clamping is 15mm;

[0026] (2) When the laser power is 140W, the scanning speed is 400mm / min, the defocus amount is 10mm, the laser frequency is 40Hz, and the pulse width is 2ms, the bending angle α of a single laser scan is obtained. 0 =2.1°, which is set as the reference angle; the defocus amount is fixed throughout the bending process, and the corresponding spot diameter D = 1.8mm when the defocus amount is 10mm.

[0027] (3) The central angle θ=60°>5° corresponding to the arc surface, and the bending angle range of the...

Embodiment 2

[0030] Example 2: A sample of a single-period three-segment arc surface of a heat shield formed by laser bending of a metal plate.

[0031] (1) Use a shearing machine to cut the metal composite plate with a thickness of 1mm into a rectangular sample with a width of 50mm and a length of 88mm, where the radius is R 1 = 38mm arc surface 1 corresponds to the plate length L 1 =47.4mm, radius R 2 The arc surface 2 of =11mm corresponds to the plate length L 2 =7.5mm, the radius is R 3 = 536.1mm arc surface 3 corresponds to the plate length L 3 =18.1mm, the width L of the flat plate for excess clamping 4 = 15mm;

[0032] (2) When the laser power is 140W, the scanning speed is 400mm / min, the defocus is 10mm, the laser frequency is 40Hz, and the pulse width is 2ms, the single-track single laser scanning bending angle α is obtained. 0 , a 0 =2.1°; the defocus amount is constant throughout the bending process, and the corresponding spot diameter D=1.8mm when the defocus amount is 1...

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Abstract

The invention belongs to the field of metal sheet laser bending forming, and particularly relates to a reverse laser forming method for a single-segment arc surface of a metal sheet. The reverse laserforming method can be used for rapid bending and forming of a single-segment arc surface or a multi-segment arc surface structure of the metal sheet. Considering the influence of the spacing of a scanning line on the smoothness of the formed arc surface, the reverse laser forming method can finish the route planning for the arc surface expected to be formed by reversing the spacing of the scanning line and the bending angle of each scanning line, the laser power, laser defocusing amount, laser scanning speed and scanning times on each scanning line are changed to ensure that the bending angleof each scanning line is the same, and the high-precision laser rapid bending and forming of different types of arc surfaces is achieved. The reverse method of the arc surface can guide the precise,rapid and flexible bending and forming of the specific arc surface effectively, and ensure the smoothness of the arc surface as much as possible under the appropriate small spacing of the scanning line; at the same time, through similar means, multi-segment arc surface processing can be completed.

Description

technical field [0001] The invention belongs to the field of laser bending and forming of metal sheets, in particular to a laser forming method for reversely finding single-segment circular arc surfaces of metal sheets, which can be used for die-free flexible forming of various single-segment or multi-segment arc surface workpieces. Background technique [0002] Die-free flexible machining of arc surface workpieces of predetermined shape and size has always been a difficult point in machining. Compared with traditional mold processing methods, laser bending forming is a flexible, mold-free, force-free, non-contact rapid prototyping technology. It is easy to realize automation, and it is easy to flexibly design the laser bending scanning path, which can realize complex shape plates. Direct bending forming, using laser bending forming technology to plan the scanning path of laser bending, it can realize moldless and rapid bending forming of single-segment arc surface or multi-...

Claims

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Application Information

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IPC IPC(8): B21D26/06B21D43/28
CPCB21D26/06B21D43/287
Inventor 王续跃韩昌张保卫
Owner DALIAN UNIV OF TECH
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