Compression vulcanization molding mold for rolling bearing seal, and method for manufacturing rolling bearing seal

A compression vulcanization molding mold for a rolling bearing seal, which is used for compression vulcanization molding of the rolling bearing seal that separates, from outside, a bearing internal space formed between an inner ring and an outer ring of a rolling bearing, wherein

• the rolling bearing seal includes an annular core metal and rubber adhered to the core metal by vulcanization,
• the rubber includes:
• a seal lip portion that extends inward in a radial direction from an inner diameter side of the core metal, and slides on a seal sliding surface of the inner ring in a circumferential direction;
• and an attachment portion that extends outward in the radial direction from an outer diameter side of the core metal, and is attached to the outer ling, and
• the seal lip portion has, over an entire circumference in the circumferential direction, a plurality of projections to form, between the seal sliding surface and the seal lip portion, oil passages that allow communication between the bearing internal space and the outside, an end of the seal lip portion curves to project toward the seal sliding surface, an edge of the end of the seal lip portion, which includes at least a portion of one of the projections, contacts the seal sliding surface, and each of the projections being formed over the entire circumference in a circumferential direction of the seal lip portion of the rolling bearing seal,
• the mold comprising:
• a female mold and a male mold which form an annular cavity for molding the rubber, wherein
• the female mold has a guide portion for positioning the core metal, and a rugged shape forming the projections on the seal lip portion, and
• the male mold has an inner-diameter-side burr groove and an outer-diameter-side burr groove respectively at an inner-diameter-side peripheral portion and an outer-diameter-side peripheral portion of the cavity, and a shape of a radially outermost portion of the inner-diameter-side burr groove is formed in a circle.