| 摘要 |
PROBLEM TO BE SOLVED: To prevent a concave surface generated by the wear of an inner circumferential surface of a chuck by the repetition of insert molding from overlapping with a chamfer part of a brittle ring during the insert molding, in an insert molding method. SOLUTION: The insert molding method in which a molten resin material is injection-molded into an inner circumferential surface 21 side of a circular brittle ring 2 comprises: a first process for arranging a chuck 5 having an expandable and reducible inside diameter on a molding mold 4 to insert the brittle ring 2 into the chuck 5; a second process for fastening an outer circumference of the brittle ring 2 with the chuck 5 which is pressed by an external force directing to the center of the chuck 5 in a diameter direction after the first process to hold the brittle ring 2; and a third process for injection molding of the molten resin material into the inner circumferential surface 21 side of the brittle ring 2 with the molding mold 4 after the second process, wherein, a concave part 54 is formed in a portion in which the inner circumferential surface 52 of the chuck 5 abuts on a chamfer part of the brittle ring 2 in the second process. COPYRIGHT: (C)2009,JPO&INPIT |
