Patent ID: 7137435

Claim:
An injection apparatus in a cold chamber die casting molding machine configured to supply molten metal of a light metal material into a material supply mouth of an injection sleeve, the injection sleeve having a plunger injection device configured to inject the molten metal using an inserting plunger, the injection apparatus comprising: a melting device configured to melt the light metal material, the melting device comprising: a billet supplying device configured to replenish the molten metal using a plurality of cylindrical rod-shaped billets of the light metal material, a billet inserting device disposed adjacent to the billet supplying device, the billet inserting device configured to move each billet forward with the inserting plunger and/or to retreat the inserting plunger a distance which exceeds an overall length of each billet, a melting cylinder situated adjacent to the billet supplying device obverse to the billet inserting device, the melting cylinder including a cylinder bore having an inside diameter which does not allow most of the cylinder bore to come into contact with a front end of each billet, the melting cylinder configured to accommodate the plurality of billets moved forward by the inserting plunger and to melt each billet from the front end of said billet to produce several shots of molten metal, a cooling member disposed between the billet supplying device and the melting cylinder, the cooling member having a through hole and a cooling duct the cooling duct configured to circulate cooling liquid around the through hole, the cooling member configured to cool the billets, and a cooling sleeve disposed between the cooling member and the melting cylinder, the cooling sleeve having an annular groove with a diameter larger than a diameter of the through hole, the annular groove configured to cool the molten metal and to form an annular seal of solidified molten material on a periphery of the billets; and a molten metal feeding member configured to pour molten metal from the melting device to the plunger injection device, the molten metal feeding member including a material supplying hole configured to pour the molten metal from a distal end of the cylinder bore of the melting cylinder to the material supply mouth, wherein the melting device is configured to meter the molten metal by pushing each billet with the inserting plunger and supplying one shot of the molten metal into the injection sleeve after the plunger injection device makes the inserting plunger retreat for replenishing.