JPS57139428A - Molding method of simple press mold - Google Patents

Abstract

PURPOSE: To form a work hole by drawing out the outside circumferential part when reproducing a simple press mold, and to simplify its reproducing utilization, by forming the outside circumferential part of the work hole piercing the surface and the reverse side of the simple press mold body formed by a core material, by use of a material being non-affinitive against the core material.

CONSTITUTION: Before a skin a material 9 is injected, on the main body of a simple press mold, that is to say, a core material 8, an inlet 4a of the skin material and an air vent 4b are provided as a work hole piercing the surface S₁ and the reverse side S₂ of the simple press mold body 7. After the skin material 9 has been injected, a synthetic resin pipe 11 embedded in the core material 7 is filled with the skin material 9 at the time of the injection work. Accordingly, an outside circumferential part 13 of the pipe 11 is adjacent to range mortar of the core material 7 through the border surface which is peeled off freely and has no affinity. Subsequently, in case of reproducing utilization of the simple press mold, the reverse side of a laminated rod part 14 is hit by use of a hammer 15 and a rod material 16, the laminated rod part 14 is removed together with a part of a skin layer 9a from the body 7, and work holes 4a, 4b are formed. In this regard, even when the center part of the work hole is formed by use of a material having no affinity with the skin layer 9a, the same effect can be obtained.

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