| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold which can be molded, without causing a parting line on the inner rib of a box-shaped mold to support a cartridge case, and also without warping the inner rib which has a slit-like space. SOLUTION: In a box-shaped mold, which is made of top and bottom walls 1 and 2 and both sidewalls 3 and 3a and provided extendedly with inner ribs 4 and 6 counterposed in parallel with the top and bottom walls inside both sidewalls, and are further provided with outer ribs 5 outside both sidewalls, the outer ribs 5 are extended in the orthogonal direction to the inner ribs 3 and 3a, and moreover the cross section is made into a hook/shape.
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