| 摘要 |
PURPOSE:To quicken the replacement of a mold by a method wherein cylinders are arranged in all extruding holes, bored in a moving die, and respective molds are arranged with pins at only parts, which are necessary for extruding molded forms, through push plates while the cylinders are selected automatically upon extruding the molded form in order to push out the pins. CONSTITUTION:Pressure oil or the like is sent by a setter into the brake chambers 30 of cylinders 22, which are necessary for molds employed at present, among a plurality of cylinders 22 to separate a brake metal 31 from a piston rod 26 and release a brake. Thereafter, a piston 27 is advanced to the limit of advance and, successively, the pressurizing of the pressure oil or the like for the brake chamber 30 of the cylinder 22 is stopped to lock the piston rod 26, which is not selected, at the limit of retreatment. When an extruding plate 17 is advanced by an extruding cylinder 18 and pins 14 are advanced through a plate 15 against springs 16 under this condition, a molded form is extruded. After extruding the molded form, the pressure oil or the like is sent into the retreating side oil chamber 29 of the selected cylinders 22 to retreat the piston rods 26 and the extruding plate 17 is retreated by extruding cylinders 18. |
