Method for removing coating of hot-rolled steel sheet by virtue of ultra-short pulse laser galvanometer

A technology of ultra-short pulse laser and hot-rolled steel plate, which is applied in the field of material processing, can solve the problems of limited coating removal width, cumbersome operation, and low removal efficiency, and achieve digital automation, smooth surface, and high removal efficiency.

Inactive Publication Date: 2016-05-25
KUSN BAOJIN LASER TAILOR WELDED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problems that the surface is not smooth and smooth after the coating is removed by mechanical methods, the removal thickness is difficult to control, and the removal efficiency is low.
However, this method also has its limitations, which are mainly manifested in the following points: (1) Due to the use of a spectroscopic device when removing the coating, the laser energy is dispersed, the energy density is reduced, and the laser power required to remove the same thickness of the coating increases , leading to an increase in use costs; (2) when the strip beam is used, when the width of the removed coating area changes, the spectroscopic device also needs to be replaced with it, the operation is cumbersome and inefficient; and there is a certain limit to the removed coating width; (3) It is difficult to fully guarantee the uniform energy distribution in the strip area after the spectroscopic device is used, so it is difficult to ensure the uniformity of the thickness of the coating removal. These limitations all limit the Al-Si coating to a certain extent Coating removal and tailor welded production of ply hot formed steel sheets

Method used

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  • Method for removing coating of hot-rolled steel sheet by virtue of ultra-short pulse laser galvanometer
  • Method for removing coating of hot-rolled steel sheet by virtue of ultra-short pulse laser galvanometer
  • Method for removing coating of hot-rolled steel sheet by virtue of ultra-short pulse laser galvanometer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Place the hot-rolled steel plate with Al-Si coating horizontally. When removing the coating by vibrating mirror laser scanning, first remove the Al-Si coating on one side of the hot-rolled steel plate; then replace the hot-rolled steel plate, and then use vibrating The method of mirror laser scanning removes the Al-Si coating on the other side, such as figure 1 shown. The specific removal steps are as follows:

[0046] Step 1): cleaning the surface of the hot-rolled steel plate to be welded to remove surface oil stains, fixing the cleaned hot-rolled steel plate on the fixture, and the hot-rolled steel plate has an Al-Si coating;

[0047] Step 2): Place the hot-rolled steel plate fixed on the fixture in step 1) horizontally, and adjust the ultrashort pulse laser emitted by the laser to be vertical to the hot-rolled steel plate;

[0048] Step 3): Set the process parameters for ultrashort pulse laser galvanometer removal of Al-Si coating: the laser is ultrashort pulse la...

Embodiment 2

[0054] Place the hot-rolled steel plate with Al-Si coating horizontally. When removing the coating by vibrating mirror laser scanning, first remove the Al-Si coating on one side of the hot-rolled steel plate; then replace the hot-rolled steel plate, and then use vibrating The method of mirror laser scanning removes the Al-Si coating on the other side, such as figure 1 shown. The specific removal steps are as follows:

[0055] Step 1): cleaning the surface of the hot-rolled steel plate to be welded to remove surface oil stains, fixing the cleaned hot-rolled steel plate on the fixture, and the hot-rolled steel plate has an Al-Si coating;

[0056] Step 2): Place the hot-rolled steel plate fixed on the fixture in step 1) horizontally, and adjust the ultrashort pulse laser emitted by the laser to be vertical to the hot-rolled steel plate;

[0057] Step 3): Set the process parameters for ultrashort pulse laser galvanometer removal of Al-Si coating: the laser is ultrashort pulse la...

Embodiment 3

[0063] Place the hot-rolled steel plate with Al-Si coating vertically, and use two ultra-short pulse lasers to remove the coating on both sides of the hot-rolled steel plate synchronously by means of galvanometer scanning, such as figure 2 shown. The specific removal steps are as follows:

[0064] Step 1): cleaning the surface of the hot-rolled steel plate to be welded to remove surface oil stains, fixing the cleaned hot-rolled steel plate on the fixture, and the hot-rolled steel plate has an Al-Si coating;

[0065] Step 2): Place the hot-rolled steel plate fixed on the tooling fixture in step 1) vertically, and adjust the two beams of ultrashort pulse laser emitted by the laser to be perpendicular to the two sides of the hot-rolled steel plate and set them symmetrically;

[0066] Step 3): Set the process parameters of two ultrashort pulse laser galvanometer removal of Al-Si coating: the laser is an ultrashort pulse laser, the pulse period is 30ns, the scanning frequency is ...

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Abstract

The invention discloses a method for removing a coating of a hot-rolled steel sheet by virtue of an ultra-short pulse laser galvanometer. The method comprises the following steps: (1) cleaning the surface of a to-be-welded hot-rolled steel sheet with an Al-Si coating; (2) fixing the cleaned hot-rolled steel sheet to a frock clamp, and adjusting ultra-short pulse laser emitted by a laser to be vertical to the hot-rolled steel sheet; (3) turning on the laser to remove the Al-Si coating of the hot-rolled steel sheet according to technological parameters for removing the Al-Si coating by virtue of the ultra-short pulse laser galvanometer; and (4) turning off the laser, and taking down the hot-rolled steel sheet with the Al-Si coating, thereby finishing the process of removing the Al-Si coating of the hot-rolled steel sheet. By virtue of the method, a light splitting device does not need to be utilized; by virtue of a galvanometer scanning method, the energy density is relatively high, the removal efficiency is high, the size of the removed coating can be adjusted, and furthermore, the removing thickness of the coating can be controlled by controlling the laser power.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a method for removing the coating of a hot-rolled steel plate by ultrashort pulse laser galvanometer scanning. Background technique [0002] At present, automobile production is developing towards safer, more energy-saving and environmental protection. Al-Si coated hot-formed steel sheets for automobiles are widely used because of their good performance. After heat treatment, the strength of Al-Si coated hot-formed steel plate is 3 to 4 times that of ordinary steel plate. Al-Si coating has good heat resistance and corrosion resistance, and the thickness of the material can be greatly reduced under the premise of ensuring the same strength. , has made outstanding contributions to the weight reduction of the vehicle body and the improvement of the safety of the vehicle body. However, during the welding process, the Al-Si coating will melt into the weld afte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/36B23K26/60B23K26/0622
CPCB23K26/36B23K26/0624B23K26/60
Inventor 朱伏久陈曦雷正龙
Owner KUSN BAOJIN LASER TAILOR WELDED
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