JP2006289996A5 - - Google Patents

Claims (7)

It has a nesting die that molds the axial side surface of the molded product with a cylindrical core facing each other vertically, and has an upper die and a lower die that can be closed directly or with an intermediate die interposed therebetween. There are fitting holes for supporting the ends of the cylindrical cores set in the molds at the center of both types of nesting molds, and the cylindrical cores are provided in the lower mold side fitting holes. A support pin that fits into the lower end opening and locks the lower end, and the upper mold-side fitting hole is concentrically opposed to the support pin and locked to the upper end of the cylindrical core body A body presser is provided, and when both the upper and lower molds are closed, a cavity is formed on the outer periphery of the cylindrical core supported by the support pin and the core presser, and a molding material such as rubber is filled in the cavity. And a molding die that is molded integrally with the cylindrical core body,
Fitting with the fitting hole in the upper mold side nesting mold while having a slight air permeability to the outer peripheral surface of the upper end portion of the cylindrical core and suppressing the leakage of the molding material. A sealing ring is provided, and further includes a molding material injection hole that leads from the upper surface of the upper mold to the cavity, and air and molding material escape holes that lead from the cavity to the upper surface of the upper mold. Mold for molded product with cylindrical core. The fitting hole portion in the lower mold side insert mold is provided with a seal member for receiving the core body that fits the outer peripheral surface of the lower end portion of the cylindrical core body while maintaining slight air permeability. Item 2. A mold for forming a molded article with a cylindrical core according to Item 1 . The upper and lower molds are provided with a plurality of cavity constituent parts each including a nested mold, a support pin and a core presser that are opposed to each other, and injection holes for the molding material into the cavities in the respective cavity constituent parts are provided for injection of the injection device. The molding die for a molded article with a cylindrical core body according to claim 1 or 2 , which is arranged at an equal distance from the outlet. The cavity component parts are arranged on the same circle centering on the injection port of the injection device, and the injection holes of the cavity component parts are arranged concentrically so as to be equidistant from the injection port. The shaping | molding die of the molded article with a cylindrical core body of Claim 3 . The molding die for a molded article with a cylindrical core body according to claim 3 or 4 , wherein the relief holes of the respective cavity constituent portions are continuous by relief grooves provided in the runner plate and communicate with the outside of the die side. 6. The cylinder according to claim 5 , wherein the escape groove on the runner plate has a circular shape centering on the injection port of the injection device, and a protruding molding portion for molding a small convex portion is provided at the upper end of each escape hole. Mold for molded products with a core. The injection hole and escape hole of each cavity component part are provided on the radiation which passes along the axial center of this cavity component part centering | focusing on the injection outlet of the said injection apparatus, The any one of Claims 4-6 Mold of the molded article with a cylindrical core as described.