主权项 |
1. A casting die applied with laser machining and coating of a carbon film on a die surface, the casting die comprising:
a plurality of grooves formed at a predetermined pitch by the 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 ridge and the carbon portion alternately formed, wherein the groove has an opening width of 45 μm or less and a depth of 60 μm or more, and wherein the ridge has, 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 the laser machining. |