Patent ID: 8905203
Filing Date: 2014-12-09
Classification: B22D,F16D

Abstract:
1. A method for producing a brake disc comprising a coupling part having a through-hole at the center thereof, a friction part formed on a periphery of the coupling part, and a wall part connecting the coupling part and the friction part, the method comprising: a mold forming process of producing a mold in which the coupling part, the wall part, and the friction part are integrally formed, the mold including a coupling part forming portion, a wall part forming portion, and a friction part forming portion, an inlet to the friction part forming portion, an inlet to a coupling part forming portion, a gap is disposed between a wall part forming portion and the coupling part forming portion for preventing molten metal from overflowing between the wall part forming portion and the coupling part forming portion and for forming an interface on the periphery of the coupling part with a predetermined depth, and an overflow having a predetermined area provided outside the wall part forming portion opposite to the gap; a first injection process of injecting a first material into the inlet of the friction part forming portion, the first material injected so as to prevent the injected first material from flowing over the gap; and a second injection process of injecting a second material into the inlet of the coupling part forming portion after the first injection process.