| 摘要 |
PROBLEM TO BE SOLVED: To allow an ejector pin to coincide with the axial center of the hole for the ejector pin when gas is vented using the ejector pin. SOLUTION: In this mold, an opening part 54D is provided to a cavity 27 to which the gate 44 formed between a first mold member 1 and a third mold member 3 is connected and the ejector pin 53 is provided in the hole 54 connected to the opening part 54D in a freely sliding state. The opening part 54D of the hole 54 is constituted so as not only to permit the fitting of the ejector pin 53 but also to loosely fit the leading end surface 55 of the ejector pin 53 in the hole 54 so as to leave a gap L on the side of the retreat position of the leading end surface 55 of the ejector pin 53. The hole 54 is formed so as to become gradually small in its diameter toward the opening part 54D. This mold is also constituted so that the ejector pin 53 is guided by the hole 54 becoming gradually small in its diameter toward the opening part 54D. By this constitution, when the ejector pin 53 is protruded into the cavity 27 through the hole 54, the axial center of the ejector pin 53 is allowed to coincide with that of the hole 54 to perform accurate ejection. COPYRIGHT: (C)2005,JPO&NCIPI
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