Material supply and melting method in injection molding of metal material

摘要

The invention has an object to permit to make the accumulation amount and the temperature of molten metal in the metal material molding machine constant, by performing material supply and melting taking the accumulation amount as reference during the molding operation. The supply apparatus 11 and the agitation means 29 of metal material at the moment of operation starting are controlled to be inactive until the temperature of the melting vessel attains a predetermined value and to start operating when the predetermined temperature is attained, allowing to supply and agitate the metal material. The supply and the agitation of metal material after the predetermined temperature is attained, are performed while gradually supplying and agitating the metal material until metal material of at least 6 times or more of the maximum injection volume is accumulated in melt state. The supply of metal material during the molding operation starts after the weighing completion to supply metal material for one shot of mold before starting the following weighing and then stops. This is performed by controlling the speed and the time of the supply apparatus for maintaining the accumulation amount and temperature of molten metal 34 in the melting cylinder 8 constant all the times.