PROCESS FOR PRODUCING BRAKE DISK, AND BRAKE DISK

摘要

Provided is a process for producing a brake disk having an outer peripheral shape with radial projections and recesses formed repeatedly in the peripheral direction, the process having excellent productivity in that a curved face section can be formed uniformly along the entire perimeter of each outer peripheral edge of the disk body and in that no chamfering step is required for deburring. In the process, a disk body (1) having an outer peripheral shape with repeatedly formed projections and recesses is half-blanked from one surface of a sheet material (W) in the thickness direction thereof, and then, the disk body (1) is blanked from the other surface of the sheet material (W) in the thickness direction thereof. Thus, curved face sections (1b, 1d) created by rollover and contiguous to the respective sheared face sections (1a, 1c) on the outer peripheral surface of the disk body (1) are formed on the respective outer peripheral edges of both said one surface and said other surface, in the thickness direction, of the disk body (1) produced according to the aforementioned process. The inner diameter (R11) of the die (11) that is used in the half-blanking step is smaller than the outer diameter (R12) of the punch (12).