Patent ID: 9156080
Filing Date: 2015-10-13
Classification: B22C,B22D

Abstract:
1. A casting die applied with a laser machining and a coating of a carbon film on a die surface, the casting die comprising: a plurality of grooves formed at a predetermined pitch by a first laser machining; a plurality of ridges protruding between the plurality of grooves; and a plurality of carbon portions buried in the plurality of grooves by the coating of the carbon film, wherein molten metal flows on the die surface on which the ridges and the carbon portions are alternately formed, wherein the grooves have an opening width of 45 μm or less and a depth of 60 μm or more, and wherein the ridges have, on a top surface thereof, a plurality of micro-grooves for reducing a contact area with the molten metal, and the plurality of micro-grooves are applied with a second laser machining.