| 摘要 |
PROBLEM TO BE SOLVED: To increase a cooling efficiency by arranging a pushing-out pin and a cooling aperture at the same position and thereby enabling effective arrangement of cooling apertures in an injection molding die apparatus. SOLUTION: A stair-stepped aperture 15 composed of a small diameter portion 13 and a large diameter portion 14, the small diameter portion 13 being a pushing-out pin insertion aperture 13, is bored in the pushing-out pin insertion aperture 13 bored in a core 3 of an injection molding die apparatus 200. The outer diameter portion 18 of a cylindrical body 16 is fit to the large diameter portion 14 of the stair-stepped aperture 15 for communication of the inner diameter portion 17 with the small diameter portion 13 to insert a pushing-out pin 7 in the small diameter portion 13 and the inner diameter portion 17. When the cylindrical body 16 is made to fit to the large diameter portion 14, the cooling water aperture 19 having an opening to the large diameter portion 14 is made to communicate with a cooling water groove 20 carved in the outer diameter portion 18 of the cylindrical body 16 to circulate cooling water in the cooling water aperture 19 through the outer diameter portion 18 of the cylindrical body 16 and thereby cool the vicinity of the cylindrical body 16.
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