The purpose of the present invention is to make it possible to shorten the time required for a burr removal step and make it difficult for the burrs to detach from a sheet member in a step for removing the burrs together with the sheet member. For removal, by making the burrs to adhere to a pliable sheet member such as paper or nonwoven fabric that has been incorporated beforehand in the molding die and stripping the sheet member from the molding die, the burrs are removed together with the sheet member. The present invention is characterized in that in order to make it difficult for the burrs to detach from the sheet member during the stripping, a radiused shape with an arc-shaped cross-section is formed by the molding die on the areas surrounding the sections where the burrs adhere to the sheet member.

The purpose of the present invention is to make it possible to shorten the time required for a burr removal step and make it difficult for the burrs to detach from a sheet member in a step for removing the burrs together with the sheet member. For removal, by making the burrs to adhere to a pliable sheet member such as paper or nonwoven fabric that has been incorporated beforehand in the molding die and stripping the sheet member from the molding die, the burrs are removed together with the sheet member. The present invention is characterized in that in order to make it difficult for the burrs to detach from the sheet member during the stripping, a radiused shape with an arc-shaped cross-section is formed by the molding die on the areas surrounding the sections where the burrs adhere to the sheet member.

A method for making a synthetic resin injection molded body that is gate-cut by die opening after injection molding by means of a pinpoint gate 9. A cavity 10 is filled with a molten resin, from a first sprue 6 that is provided coaxially with the injection direction of the molten resin, through a runner 7 that is provided in the perpendicular direction to the first sprue 6, via a pinpoint gate 9 that is formed on a tip part of a second sprue 8 that is provided horizontally to the injection direction of the molten resin, from a gate port 9a of the pinpoint gate 9 formed on a cavity plane that is in parallel with the die opening direction; after cooling, gate cutting is performed by means of die opening; and a molded body is taken out in an ejection step.

A method for making a synthetic resin injection molded body that is gate-cut by die opening after injection molding by means of a pinpoint gate 9. A cavity 10 is filled with a molten resin, from a first sprue 6 that is provided coaxially with the injection direction of the molten resin, through a runner 7 that is provided in the perpendicular direction to the first sprue 6, via a pinpoint gate 9 that is formed on a tip part of a second sprue 8 that is provided horizontally to the injection direction of the molten resin, from a gate port 9a of the pinpoint gate 9 formed on a cavity plane that is in parallel with the die opening direction; after cooling, gate cutting is performed by means of die opening; and a molded body is taken out in an ejection step.

A cylinder unit detachably coupled to a housing unit including a cutting unit detachably coupled to the cylinder unit, the cutting unit configured to move, responsive to an operation of the cylinder unit, toward an injection molding unit to cut a gate of an injection-molded object, a cover core unit detachably coupled to the injection molding unit, the cover core unit configured to face the gate, wherein the cutting unit passes through the cover core unit, and a cutting core unit detachably coupled to the cover core unit, the cutting core unit configured to face the gate, wherein the cutting unit passes through the cutting core unit.

A cylinder unit detachably coupled to a housing unit including a cutting unit detachably coupled to the cylinder unit, the cutting unit configured to move, responsive to an operation of the cylinder unit, toward an injection molding unit to cut a gate of an injection-molded object, a cover core unit detachably coupled to the injection molding unit, the cover core unit configured to face the gate, wherein the cutting unit passes through the cover core unit, and a cutting core unit detachably coupled to the cover core unit, the cutting core unit configured to face the gate, wherein the cutting unit passes through the cutting core unit.

An injection mold capable of planing and cutting gates in an inside thereof and a planing and cutting method are provided. The injection mold includes a blade fixed block arranged between a moving mold and a fixed mold. Blades arranged on the blade fixed block and configured for cutting off gate condensed-material. The mold includes ejectors for ejecting out the gate condensed material and the blade fixed block. Runners formed between the blade fixed block and the fixed mold. Cut holes for communicating runners and gates are formed in blades. Ejector holes for penetrating the ejectors are formed in portions of the blade fixed block which correspond to bottoms of runners. The blade fixed block moves relative to the moving mold in a mold opening direction. The moving mold is provided with a limiting mechanism for limiting the blade fixed block after injection molding parts are separated from a cavity.

An injection mold capable of planing and cutting gates in an inside thereof and a planing and cutting method are provided. The injection mold includes a blade fixed block arranged between a moving mold and a fixed mold. Blades arranged on the blade fixed block and configured for cutting off gate condensed-material. The mold includes ejectors for ejecting out the gate condensed material and the blade fixed block. Runners formed between the blade fixed block and the fixed mold. Cut holes for communicating runners and gates are formed in blades. Ejector holes for penetrating the ejectors are formed in portions of the blade fixed block which correspond to bottoms of runners. The blade fixed block moves relative to the moving mold in a mold opening direction. The moving mold is provided with a limiting mechanism for limiting the blade fixed block after injection molding parts are separated from a cavity.

The rolling bearing seal includes a core metal and rubber adhered to the core metal by vulcanization. The rubber includes: a seal lip portion having, over the entire circumference in the circumferential direction, a plurality of projections that extend inward in the radial direction from the inner diameter side of the core metal, and slides on a seal sliding surface of an inner ring of a rolling bearing; and an attachment portion that is attached to an outer ring of the rolling bearing. A compression vulcanization molding mold includes a female mold and a male mold. The female mold has a guide portion for positioning the core metal and a rugged shape forming the projections on the seal lip portion. The male mold has an inner-diameter-side burr groove and an outer-diameter-side burr groove and the shape of a radially outermost portion of the inner-diameter-side burr groove is formed in a circle.

A resin part includes a molded main body that has a plate shape with a longitudinal direction and is constituted of an injection-molded product. The resin part has a gate portion that is a vestige of a resin injection gate. The gate portion is located in an end face part of the molded main body to cross a position corresponding to a center of gravity of the molded main body; the end face part extends in the longitudinal direction of the molded main body.