Patent ID: 8235089
Filing Date: 2012-08-07
Classification: B22C

Abstract:
1. A method for casting a disk rotor made of cast iron including graphite, the disk rotor including a sliding ring part having a circumferential outer surface and a circumferential inner surface, with a sliding surface formed between the circumferential outer surface and the circumferential inner surface of the sliding ring part, the method comprising: preparing a mold, including: runners respectively communicating with the gates constituting the gate group; and a sprue communicating with the runners, the gates constituting the gate group including a distal gate that includes a longest flow distance of melt flowing from the sprue and a proximal gate that includes a shortest flow distance of melt flowing from the sprue, an inertial direction of melt flowing to the distal gate through a corresponding one of the runners is designated as a normal flow direction for the distal gate, the distal gate is inclined in a direction such that melt injected from the distal gate into the casting cavity flows in the normal flow direction for the distal gate, and the proximal gate is inclined in a direction corresponding to a flowing direction of melt injected from the proximal gate into the casting cavity; pouring melt into the sprue of the mold; supplying the melt to the gates of the gate group through the runners; injecting the melt from the gates in the horizontal injection direction into the casting cavity at angles greater than 0° and less than 90° with respect to the corresponding normal lines; and solidifying the melt.