METHOD FOR CODE MARK MARKING OF SMALL STEEL MADE ARTICLE AND SAID ARTICLE WITH CODE MARK

摘要

PURPOSE: To exactly execute reading of marks and to improve the durability of marks code marks for optical reading by putting these marks at the arbitrary points of small steel articles by a laser. CONSTITUTION: The small steel articles are marked with data codes 2 by oxidation marking or mortise marking with a laser beam. In the case of the oxidation marking, marking parts are black. In the case of the mortise marking, the marked data codes 2 themselves are composed of recessed parts engraved by the laser beam and projecting parts which are flush with the surface part of metal, are not worked at all and eventually project with respect to the recessed parts.