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    • 8. 发明专利
    • INJECTION APPARATUS FOR MOLTEN METAL
    • JP2001179417A
    • 2001-07-03
    • JP36782299
    • 1999-12-24
    • NISSEI PLASTICS IND CO
    • KODA NORIHIROMIYAGAWA MAMORUHAYASHI YUJI
    • B22D17/04B22D17/20B22D17/30
    • PROBLEM TO BE SOLVED: To enable an injection apparatus to perform the shifting of metal material, the melting with the outer heat and the weighting, degassing, etc,. in the case of executing the injection molding of molten metal by adopting a storing part for molten metal material in an injection screw. SOLUTION: The injection apparatus consists of a heating cylinder 1 formed in a weighing chamber 18 by reducing the diameter of its top end part communicated with a nozzle member 11 and the injection screw 2 freely rotated and advanced/retreated in the inner part of the heating cylinder. At the top end part of the injection screw 2, the weighing chamber 18 and a sliding clearance are secured, and a plunger 21 insertable to be freely advance/retreated into the weighting chamber 18 is formed. The storing part B for the molten metal material is arranged only at a shaft part 24 between the plunger 21 and a supplying part A having a screw flight 23 around the shaft part 22. At the boundary between the supplying part A and the storing part B, a bulging part 25 which limits the volume of the metal material flowing through the storing part B and prevents the back flow into the supplying part B at the injection time, is arranged.