To provide a method of working a metallic material, by which production of cracks caused by bending work can be suppressed.
A method of working a metallic material 1, by which a bending work is performed along a bending projected line L with respect to a plate-like metallic material 1, includes: a step of emitting a laser beam 3 along the bending scheduled line L of a metallic material 1 so that a portion corresponding to the bending scheduled line L of the metallic material 1 is degraded to predetermined proof stress; and a step of applying force to the metallic material 1 so as to be bent with the bending projected line L as a reference after the step of emitting the laser beam 3. Heat is locally applied to only a portion where the metallic material 1 is bent by the laser beam 3 without changing the properties of the whole metallic material 1. Then, the proof stress (mechanical strength) of only the portion to be bent of the metallic material 1 is degraded and, after that, the metallic material 1 is bent along the bending scheduled line L.
OIKAWA MASASHI
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Yoshiki Kuroki
Hiromitsu Nakayama
Arai Tohio
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