| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling method applicable also to a die of an injection molding apparatus without an insert and improving the cooling efficiency of an injection-molded product to shorten a molding cycle. SOLUTION: This injection molding apparatus comprises: an ejector pin 5 movable so that an abutting surface 7 takes each position of a molding position O, a retreat position P retreated by a predetermined stroke from the molding position O, and a projecting position Q projected from the molding position O; a space part 8 formed between the abutting surface 7 of the ejector pin 5 and a cavity 20 when the ejector pin 5 shifts into the retreat position P; a lead-in passage 9 for leading a refrigerant B into the space part 8; and a discharge passage 10 for discharging the refrigerant B led into the space part 8, to the outside. COPYRIGHT: (C)2009,JPO&INPIT
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