Steel Plate Processing Device And Steel Plate Processing Method

Abstract: This steel plate processing device comprises one or more support rolls and a laser irradiation unit. The laser irradiation unit comprises a laser output part, a scanning optical part, a condensing optical part, a casing, and an angle adjustment part that changes an angle of the casing with respect to a steel plate. The angle adjustment part changes the angle of the casing in a plane formed by the normal direction of the steel plate and a scanning direction such that, when a surface of the steel plate is scanned with a laser beam, the laser beam condensed by the condensing optical part has the same distance between the condensing optical part and the surface of the steel plate over the entire length of an area of the surface of the steel plate to be scanned with the laser beam. The laser irradiation unit emits the laser beam with the angle of the casing having been changed by the angle adjustment part to form a groove portion or a distorted portion in the surface of the steel plate.

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