Sunstar Engineering Pte. Ltd.

Tadashi Takenaka

Satoshi Kubota

Koji Tamura

In a brake-disc intermediate product, a corrugated portion is molded using an upper mold and a lower mold. The brake-disc intermediate product is set in a mold, the mold has a slope corresponding to the corrugated portion, and an angular portion formed along the outer circumferential edge of the corrugated portion is in contact with the slope in a state where the brake-disc intermediate product is set in the mold. The angular portion in contact with the slope is deformed by pressing the brake-disc intermediate product in a direction of the mold, to mold a chamfer portion. The slope is formed so that a chamfering angle formed with respect to an inner bottom surface of the mold is larger at a portion in contact with the concave portion than a chamfering angle at a portion in contact with the convex portion.

Method for manufacturing brake disc and brake disc

A brake disk producing method, comprising a periphery pressing step for forming an outer peripheral shape () of a rotor plate () into a peripheral shape having recesses and ridges () repeated in a radial direction, and a chamfering step for forming a chamfered surface () by pressing, against a corner portion () on an outer peripheral edge of the rotor plate (), a die (), and a brake disk made by the method. Accordingly, it is possible to improve heat radiation capability, reduce the weight and moment of inertia, improve safety in handling, and suppress increase in production costs. Furthermore, by forming the chamfered surface (), the amount of wear of a brake pad pressed by the brake disk () can be reduced, and durability of braking performance can be maintained or improved.

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Takatsuki, Japan

Tadashi Takenaka