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

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...

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

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