| 摘要 |
PROBLEM TO BE SOLVED: To enable manufacture of a finished product free from fins on the joint surfaces of plural molding dies by forming notched parts on the joint surfaces of the molding dies and sucking a generated gas from the notched parts through gaps. SOLUTION: In the resin molding dies for manufacturing a solenoid valve or the like, vent holes 5 are provided in a recessed form in a male molding die 1 and at the same time, discharge holes 5a communicating with the vent holes 5 are formed longitudinally in the male molding die 1 in such a way that the discharge holes 5a can be formed with a female molding die 2. In addition, projecting parts 9, 10 are formed on the joint part between the molding dies 1, 2 in order to form notched parts 6 on the joint faces of a valvular seat, so that gaps 11 are formed by the projecting parts 9, 10. When a resin is molded using these molding dies 1, 2, the dies 1, 2 are joined together to form a space for forming cavities 8, the vent holes 5, discharge holes 5a and notched parts 6. After that, the molten resin is made to flow into the cavities 8 while being sucked from the discharge holes 5a, when gas generated from the molten resin is discharged through the notched parts 6, vent holes 5 and discharge holes 5a.
|
