| 摘要 |
PROBLEM TO BE SOLVED: To form a through-hole straight and with good accuracy on a side wall when a cylindrical body is to be manufactured by resin molding. SOLUTION: A molding space 13 is formed of a cavity mold 11 and a core mold 12 with its end reaching the bottom of the cavity mold 11, and one continuous shaft pin 14 running through the core mold 12 and the cavity mold 11 is disposed in the molding space 13. The shaft pin 14 can be inserted into and removed from the core mold 12 and the cavity mold 11 and retained on the core mold 12 and the cavity mold 11 through a clearance of 5-15μm. Resin is injected into the molding space of the above constitution and filled therein. The shaft pin 14 is drawn out just after the completion of dwelling, and mold opening is carried out to release a molded product. |
