| 摘要 |
PROBLEM TO BE SOLVED: To shorten the cycle time of an injection molding step and prevent an inverted blister or a warpage from being generated in an injection-molded product, and further to provide a mold structure of an injection mold with high durability and a method for manufacturing a core pin for injection molding. SOLUTION: The mold structure 12 of an injection mold comprises a first half 14 and a second half 25 of the injection mold for forming a cavity space 13 of the injection mold, core pins 16 buried in the first half 14, and receiving holes 26 for receiving the core pins 16 which are formed in the second half 25. In addition, each of the core pins 16 has an imbedded part 17 and a tip 18 coaxially arranged to each other. Further, the imbedded part 17 of the core pin 16 is made of a copper alloy, and the tip 18 thereof is made of steel. Besides, the imbedded part 17 and the tip 18 are joined together by brazing at a joint 19.
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