| 摘要 |
PURPOSE: To form the body of a slider and a pull by different types of materials or to be of different colors by forming the slider body and the pull mutually in fore and after in one set of forming metal mold. CONSTITUTION: In the case of injection molding, a body core 15 and a child core 16 are entered in both metal molds 13, 14 closely adhering to each other, a third cavity 25 is kept close to inject molten metal only in a first cavity, and molten metal is forcedly fed in from a first sprue 19 to integrally form a column 9, an upper blade 3, a flange 6, a diamond 5, a lower blade 4 and a Y-shaped groove 7 which form a pull engagement hole 8. Subsequently, when a slider body 1 is a little hardened, the child core 16 is drawn out for the width of a pull 2, whereby the third cavity 25 for forming the shaft part 12 is constructed by utilizing the back of the previously injection-molded column, 9, and the third cavity 25 is formed in such a manner as to be connected to a second cavity 23 for forming the main body of the pull 2. Then, the pull 2 and the shaft part 12 of the pull are formed to be engaged with the column 9 at once by forced feeding of molten metal from a second sprue 4.
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