초록 ▼

The casting apparatus and method include a magnetically responsive valve disposed in the molten metal inlet passage of the mold for movement between an open position during mold filling and a closed position after mold filling and during removal of the mold from the underlying molten metal pool to p

The casting apparatus and method include a magnetically responsive valve disposed in the molten metal inlet passage of the mold for movement between an open position during mold filling and a closed position after mold filling and during removal of the mold from the underlying molten metal pool to prevent run-out of molten metal from the metal-filled mold cavity. The valve is moved to the closed position by a magnetic force exerted thereon by permanent magnets or an electromagnet disposed around the inlet passage below the valve.

대표청구항 ▼

Apparatus for countergravity casting of molten metal, comprising: (a) a mold having a mold cavity for receiving the molten metal and molten metal inlet passage means for supplying the molten metal to the mold cavity, said inlet passage means including a lower open end adapted for immersion in an und

Apparatus for countergravity casting of molten metal, comprising: (a) a mold having a mold cavity for receiving the molten metal and molten metal inlet passage means for supplying the molten metal to the mold cavity, said inlet passage means including a lower open end adapted for immersion in an underlying molten metal pool, (b) magnetically responsive valve means disposed in the inlet passage means for movement between an upper open position for permitting the molten metal to flow thereby to the mold cavity when said lower open end is immersed in said molten metal pool with a negative differential pressure established to draw the molten metal upwardly through said inlet passage means and a lower closed position for preventing molten metal flow from the mold cavity after it is filled with molten metal, and (c) means for subjecting the valve means to a magnetic force after the mold cavity is filled with the molten metal to move the valve means to the closed position to prevent flow of the molten metal from the metal-filled mold cavity when said lower open end is removed from said pool. A method of countergravity casting molten metal, comprising: (a) providing a mold having a mold cavity and a molten metal inlet passage means with a lower open end adapted for immersion in an underlying molten metal pool, (b) relatively moving the mold and the pool to immerse said lower open end in the pool, (c) applying a differential pressure between the mold cavity and the pool to urge the molten metal upwardly through the inlet passage means into the mold cavity thereabove to fill the mold cavity with the molten metal, including opening a magnetically responsive valve means disposed in the inlet passage means to an upper open position to permit the molten metal to flow thereby to the mold cavity as the molten metal is urged upwardly through the inlet passage means, (d) applying a magnetic force to the open valve means after the mold cavity is filled with the molten metal to move said valve means to a lower closed position where said valve means prevents flow of molten metal from the metal-filled mold cavity, and (e) relatively moving the mold and the pool to remove said open lower end from the pool with said valve means being in the closed position.