| 摘要 |
PROBLEM TO BE SOLVED: To allow the condition where the possibility of the involution of gas is low even in any of a sleeve, a runner and a gate to appear in the shapes of the runner and the gate, and thus to inexpensively prevent the involution of gas into molten metal without adding special remarkable changes to die. SOLUTION: In an injection molding die 10 where molten metal is injected into a cavity 13 formed of metal patterns 11 and 12 from a sleeve 16 through a runner 15 and a gate 14, as for the shape of the runner 15, the flow passage of the molten metal has a continuous Z-shape in the first direction H going from the sleeve 16 to the cavity 13, and also, the flow passage of the molten metal has an almost linear shape in the second direction W almost orthogonal to the first direction. Further, at least the width in the second direction W of the gate 14 is made into the almost equal one to the whole width in the second direction W of the face at which the gate 14 is formed in the cavity 13, and the area of the flow passage in the runner 15 has a shape increasing toward the first direction H. COPYRIGHT: (C)2005,JPO&NCIPI
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