| 摘要 |
PURPOSE:To reduce the molding cost for raising the molding yield by a method in which a three division type of mold core with lesser numbers of sliding faces and dove-tail grooves and capable of molding by one-stage projection is used and a cylindrical molding is formed by injection. CONSTITUTION:Molten resin is injected through a runner 25 and a gate 26 from a sprue 18a into a cavity 24' to form a molding 24. After the resin cast into the cavity 24' is cooled and hardened, molds are opened, whereupon the molds are opened to left and right sides at a parting line 27, the molding 24 is cut off from the gate 26, a side core 13 is vertically opened by the action of an angular pin 19, and all cavity portion to form the outer cylinder of the molding 24 is released from the molds. |
