Method of manufacturing outer cutter of rotary electric shaver

摘要

A method of manufacturing an outer cutter 10A of a rotary electric shaver 1 that includes the outer cutter 10A and an inner cutter 12A which is slidingly in contact with a bottom surface of the outer cutter 10A and rotates, in which a plurality of the circular shaving surfaces 16A, 18A are integrally formed in the outer cutter 10A in a concentric manner, and round hole-shaped hair introduction openings 30 are formed in at least one of the circular shaving surfaces 18A includes (a) a step of grinding or polishing a predetermined position where the round hole-shaped hair introduction openings 30 are formed in the circular shaving surface 18A to obtain a thickness size smaller than an inner diameter size of the round hole 30; and (b) a step of forming the round hole-shaped hair introduction openings 30 in the position where the grinding or the polishing is performed by pressing, after the step (a).