Method of charging molten metal into a vertical die casting machine

摘要

A method of charging molten metal into a vertical die casting machine, wherein molten metal is introduced into a lower sleeve in which a lower plunger is slidably received, to store therein a mass of molten metal having a surface level not higher than the bottom of a molten metal inlet to a mold cavity. Next, an upper plunger is lowered to a predetermined position, raising the lower plunger to urge the molten metal upwardly and move it into the mold cavity. The upper plunger can then be moved to apply pressure to the molten metal. The method ensures smooth charging of molten metal and casting of a product free of casting defects.