| 摘要 |
PROBLEM TO BE SOLVED: To simply mold a product wherein the dimensional accuracy of a partially thin-walled part is required by a usual injection molding machine. SOLUTION: A hollow partially thin-walled resin product W is molded by a fixed matrix 3, a core 6 and a movable matrix 7. A link 10 is pivotally provided on the outside of the fixed matrix 3 and the first engaging part 11 thereof is engaged with the movable matrix 7 immediately after mold opening is started to open the core 6 while preventing the opening of the movable matrix 7. By this constitution, the core 6 is slightly separated from the partially thin-walled resin product W. When mold opening is advanced, the first engaging part 11 of the link 10 is detached from the movable mold 7 to return to usual mold opening. The core 9 can be slightly separated by utilizing the mold opening of a usual injection molding machine and the deformation of a partially thin- walled part 8 can be prevented.
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