| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold structure for vacuum casting which prevents the inclusion and insufficient flow of air into the inside of a finished product during manufacturing of a resin part from occurring, when a vacuum casting operation is performed. SOLUTION: This resin injection device for vacuum casting is equipped with a valve 102 for opening/closing an air venting part 120 provided at the top of a molding tool 100 at a spot where the venting part 120 is provided and an injection gate 103 extending toward the lower part of a finished product cavity 20 from a resin reservoir 101. The air whose specific gravity is lighter than a resin 1 proceeds from the lower part to the upper part of a finished product cavity 20, passing through the air venting part 120 to be pushed out to the outside of the molding tool 100. In addition, the valve 102 is opened/closed using a change in the atmospheric pressure.
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