| 摘要 |
A cooling apparatus for an injection molding machine, which is used to form hollow parts, employs mating mold dies with first and second corresponding hollow core members attached to the dies and extending into the mold cavity. When the cavity is closed, the hollow core members engage to form a continuous cooling fluid passageway through them. During the molding operation, liquid cooling fluid is supplied under pressure to flow through this passageway. At the end of the molding cycle, the flow of cooling fluid is blocked and a second valve is opened to admit air into the passageway near the point where the two hollow core members engage. A vacuum is applied to the opposite ends of both of the hollow core members to pull any cooling fluid and air from the junction between the core members and away from the junction back through the core members. This is a reverse flow or suction of the cooling fluid out of both of the core members just prior to and during the opening of the mold and disengagement of the core members. The injection of air at the point of separation also facilitates the purging of cooling fluid away from the junction of the core members to prevent contamination of the part formed in the mold.
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