| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin molding capable of preventing defects of cavity remaining, and having a shape allowing adjustment of demolding resistance from a core mold to a moderate level. ! SOLUTION: A resin molding 1 having a hollow cylindrical part 11 is a member formed through injection molding of synthetic resin. The inner peripheral surface of the cylindrical part 11 has no undercut in the demolding direction, and the inner peripheral surface is divided into a plurality of partial regions 11a, 11b and 11c, and provided with steps 11d and 11e so that the adjacent partial regions are offset each other in the radial direction of the cylindrical part. The outer peripheral surface 11f of the cylindrical part 11 has no undercut in the demolding direction and has no step unlike the inner peripheral surface. The existence of the steps in the inner peripheral surface moderately increases demolding resistance from a core mold. ! COPYRIGHT: (C)2015,JPO&INPIT |
