Importance

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Abstract

In a method of manufacturing a brake disc having an outer peripheral shape of projections-recesses repetition in which a radial projection and a radial recess are alternately repeated in the circumferential direction of the brake disc, there is provided a method in which a curved face portion can be formed uniformly over the entire outer peripheral edge portion of the disc main body so as to eliminate the step of chamfering for removing burrs and which is superior in productivity. A disc main body whose outer peripheral shape is projections-recesses repetition is half-blanked from one of plate thickness directions of a sheet material. Thereafter, the disc main body is blanked from the other of the plate thickness directions of the sheet material W. At an outer peripheral edge portion of each surface in said one and the other of the plate thickness directions of the disc main body manufactured by this method, there is formed a curved face portion, due to sagging, on the disc main body 1 in a manner to be in continuation of the sheared portions on an outer peripheral surface of the disc main body. The inner diameter R₁₁ of the die to be used in the half-blanking step is configured to be slightly smaller than the outer diameter R₁₂ of the punch.

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First Claim