| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent improper displacement of a core pin. <P>SOLUTION: An injection molding die M includes: a fixed molding die 10 and a movable molding die 20 for molding the outer circumferential surface of a tubular molding article P; a first core pin 34A and a second core pin 34B for molding the inner circumferential surface of the tubular molding article P; a first holder 31A and a second holder 31B for retaining a base end part 39 of both of the core pins 34A, 34B to be displaced in a length direction of both of the core pins 34A, 34B; a first absorbing material 35A and a second absorbing material 35B which are provided in the first holder 31A and the second holder 31B, respectively, and absorb expansion of the core pins 34A, 34B caused by thermal expansion through elastic deformation. <P>COPYRIGHT: (C)2013,JPO&INPIT |
