Method for laser stripping mobile metal products and equipment for implementing the method

Abstract

The application discloses a method for stripping a mobile metal product (3) having an oxide layer, using laser stripping, the method comprising the following steps: at least one first laser (6) is sent on the product to be stripped ( 3) the light beam (7) reflected on the oxidized surface, said emission beam (9) is intercepted by the sensor (8), which sends the collected information to the processing unit (10); the processing unit (10) calculates the product ( 3) the absorption of the light beam (7) by the surface of the oxidized surface in the direction of said reflected light beam (9) is deduced from this, and this emissivity is compared with the reference value pre-recorded in the processing unit (10) The information is associated; at least one second laser (13) sends a beam (14) onto the surface of the product to peel off the surface, the spot of the beam (14) passing through the spot of the beam (14) on the product ( 3) Optical and / or mechanical scanning methods that move laterally on the surface of the surface, or cover the entire surface to be peeled off by an optical system that converts light spots into lines, and the second laser (13) is controlled by the control unit (15 ) control which receives information provided by the processing unit (10) in order to determine the operation to be imposed on said second laser (13) by comparison with experimental results pre-recorded in the control unit (15) parameters in order to peel off the surface of the product (3); means (16, 17) for inspecting the peeled surface of the product (3) detect the effect of the peeling. The present application also relates to a device for carrying out the method.

Description

Technical field[0001]The present invention relates to removing the oxide layer covering the metal product, especially the metal product made of steel, after some parts of the metal product are exposed to an oxidizing atmosphere, for example, after staying in a heat treatment furnace.Background technique[0002]In the continuation of the description herein, the advantageous exemplary applications of the present invention will be all types (austenite, ferrite, austenite-ferrite, etc.), stationary or moving, hot rolling (forming) Or cold-rolled (formed) stainless steel strips and plates. However, it must be understood that this is absolutely not restrictive and the present invention can be applied to other metals that also have technical problems similar to those encountered on stainless steel strips and plates, especially various grades of carbon steel and special Alloys (especially iron-based alloys). The present invention can also be applied to products other than strips and plates, s...

AI Technical Summary

Problems solved by technology

[0022] However, due to extensive maintenance, operating modes of the lasers that are continuous or use excessively long pulses, and high operating costs due to the use of too many lasers (given the high moving speeds of current production lines), the use of CO 2 Existing technologies combining , excimer or Nd:YAG lasers do not achieve optimal results on industrial-scale moving strip or sheet

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