Method for marking on metallic member

摘要

Provided is a method for marking on a pressed metallic component whose visibility and corrosion resistance in a marking target is ensured. The method includes a step of irradiating a base treatment target region including a marking target region with a laser beam on a first irradiation condition, and a step of irradiating the marking target region with the laser beam on a second irradiation condition, in which a charged energy of the laser beam is set to be smaller on the first irradiation condition than the second irradiation condition, thereby providing between the marking pattern and a non-irradiation region, a base region having a residual stress greater than that of the non-irradiation region and a residual stress smaller than that of the marking pattern, so as to ensure a visibility. Furthermore, a corrosion resistance is ensured by using a metallic member which is heat-treated to enhance the hardness.

主权项

1. A method for laser marking on a metallic member comprising:
a base treating step of irradiating a base treatment target region including a marking target region on a marking target surface of said metallic member with a laser beam on a first irradiation condition; and a marking step of irradiating said marking target region with said laser beam on a second irradiation condition, thereby forming a marking pattern, wherein a charged energy of said laser beam on said first irradiation condition is set to be smaller than a charged energy of said laser beam on said second irradiation condition, thereby to provide between said marking pattern and a non-irradiation region which is not irradiated with said laser beam, a base region having a residual stress greater than that of said non-irradiation region and a residual stress smaller than that of said marking pattern.