Cutting method with auxiliary laser heating for metal strip

A metal strip, laser-assisted technology, used in laser welding equipment, metal processing equipment, accessories of shearing machines, etc., can solve problems such as inability to meet continuous and high-speed production requirements, and reduce wear and chipping risks. , The effect of reducing cutting force and improving efficiency

Active Publication Date: 2012-12-26
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patented technologies are all technologies that use laser local heating to soften the material to provide forming quality when the sheet is formed, and all involved are non-continuous production, and there is no processing speed requirement, which cannot meet the continuous and high-speed production requirements of the present invention, but Evidence of technical feasibility is provided for the present invention

Method used

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  • Cutting method with auxiliary laser heating for metal strip
  • Cutting method with auxiliary laser heating for metal strip
  • Cutting method with auxiliary laser heating for metal strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] High-strength steel, the laser is a semiconductor laser

[0052] Please refer to attached drawings 1-3, the first step, according to the production characteristics of high-strength steel, the running speed U of the strip, the shape and area A of the laser spot can be given S , and the laser irradiation angle α.

[0053] U=80m / min

[0054] A S =1.2×2.0mm 2 =2.4mm 2 (Select a rectangular spot, the long side is the running direction of the strip)

[0055] (The surface morphology of high-strength steel is relatively poor, and the speed is slow)

[0056] The second step is to determine a0~a2, β and χ according to the surface morphology, thickness and laser wavelength of the metal strip.

[0057] Iron and steel materials, solid-state lasers, according to experiments;

[0058] a0=0.0741

[0059] a1=4.8e5

[0060] a2=-3.6e10

[0061] β=0.5

[0062] χ=-0.75

[0063] The third step is to determine the resistivity ρ of the strip and the correlation coefficients requi...

Embodiment 2

[0077] Silicon steel, the laser is a semiconductor laser

[0078] In the first step, according to the characteristics of silicon steel production, the running speed U of the strip, the shape and area A of the laser spot can be given S , and the laser irradiation angle α.

[0079] U=280m / min

[0080] A S =1.2×1.2mm 2 =1.44mm 2

[0081] α = 1 2 π

[0082] (The surface morphology of silicon steel is relatively good, and the speed is fast)

[0083] The second step is to determine a0~a2, β and χ according to the surface morphology, thickness and laser wavelength of the metal strip.

[0084] Iron and steel materials, solid-state lasers, according to experiments,

[0085] a0=0.0741

[0086] a1=4.8e5

[0087] a2=-3.6e10

[0088] χ=-0.75

[0089] The third step is to determine the resistivity ρ of the strip and the correlation coefficients required for temperature calculation, namely At and ξ, accor...

Embodiment 3

[0103] Stainless steel, the laser is a semiconductor laser

[0104] In the first step, according to the characteristics of stainless steel production, the running speed U of the strip, the shape and area A of the laser spot can be given S , and the laser irradiation angle α.

[0105] U=120m / min

[0106] A S =1.2×2.0mm 2 =2.4mm 2

[0107] (Stainless steel has good surface appearance and fast speed).

[0108] The second step is to determine a0~a2, β and χ according to the surface morphology, thickness and laser wavelength of the metal strip.

[0109] Iron and steel materials, solid-state lasers, according to experiments,

[0110] a0=0.0741

[0111] a1=4.8e5

[0112] a2=-3.6e10

[0113]χ=-0.75

[0114] The third step is to determine the resistivity ρ of the strip and the correlation coefficients required for temperature calculation, namely At and ξ, according to the thermal physical properties of the metal strip.

[0115] According to the material handbook, the resi...

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Abstract

The invention relates to a cutting method with auxiliary laser heating for a metal strip. Laser is adopted to heat and then cut the metal strip. The cutting method is characterized in that heating temperature Th is equal to xi multiplied by A, then multiplied by F, then multiplied by A<x>s, and then multiplied by U<-1.5>, wherein U is the running speed of the metal strip, and the unit of U is m / min; F is the power of a laser device, and the unit of F is W; AS is the laser spot area, and the unit of AS is mm<2>; the xi is a constant correlated to the density and the specific heat capacity of the metal strip, and is equal to (0.3-0.8)e3; x is a constant correlated to the thickness of the metal strip, and is equal to a value between -0.75 and 0.0; the cutting temperature T is equal to Th minus delta T; and the delta T in the formula is the temperature drop of the metal strip. The cutting method has the advantages that the cutting method is high in heating efficiency, and is adapted to high-speed cutting, particularly high-speed cutting of an ultrathin strip with a high-quality requirement.

Description

【Technical field】 [0001] The invention relates to the technical field of metal strip cutting, in particular to a laser-assisted heating metal strip cutting method. 【Background technique】 [0002] Metal strips, such as steel strips, copper strips, aluminum strips, etc., are generally produced by processes such as smelting, rolling, finishing, coiling, and packaging, which involve cutting and processing of strips such as trimming, cross-cutting, and slitting . Traditional strip cutting methods generally use disc shears (to meet the requirements of trimming and longitudinal cutting) and oblique blade shears (to meet the requirements of cross-cutting), etc., all of which are mechanical cutting methods, that is, using the action of the upper and lower cutting edges to produce The crack propagation causes the strip to be severed. Although this cutting method has the characteristics of high speed and flexibility. Taking the disc shears of steel strips as an example, the general ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/00B23D33/00
Inventor 王英杰李山青王卫泽黄涛赵春涛
Owner BAOSHAN IRON & STEEL CO LTD
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