Edmund O Sylvester

US Patent:

47669454, Aug 30, 1988

Filed:

Aug 15, 1984

Appl. No.:

6/641030

Inventors:

Edmund Q. Sylvester - Shaker Heights OH

International Classification:

B22D 3500

US Classification:

164136

Abstract:

A process and apparatus for casting semi-finished metal products in which a molten-metal-proof plunger is disposed at the top of a cavity in a permanent mold. A thin band of metal is attached to the plunger and extends above its top. Inside the metal band on top of the plunger is insulation and on top of that is a barrier to the molten metal. A reservoir of molten metal is created and maintained in a pouring cup over the plunger, and the plunger is caused to descend in the cavity at a controlled rate so that the molten metal enters and fills the cavity above the plunger. Promptly after the plunger reaches the bottom of its stroke, it is reversed to lift the casting and pouring cup at least slightly out of the mold. The shim band, barrier, and insulation are expendable, but the plunger is used again.

US Patent:

39483118, Apr 6, 1976

Filed:

Jun 13, 1974

Appl. No.:

5/479033

Inventors:

Edmund Q. Sylvester - Shaker Heights OH

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

B22D 3302

US Classification:

164341

Abstract:

A method and apparatus for the direct casting of steel slabs for subsequent processing instead of casting ingots and then reducing them to slabs, blooms or billets. A flat elongated casting cavity is formed by an assembly of mold components to define a slab. Prior to casting, this mold is inclined at an angle of about 3. degree. to the horizontal with the bottom end of the casting cavity higher than the pouring end. The molten metal is poured through a sprue attached to the mold assembly adjacent the pouring end. The sprue provides a reservoir for molten metal at a level above the bottom end of the casting cavity so that the casting cavity is completely filled during pouring. When pouring is completed, the mold assembly is promptly tilted to an upright position with the pouring end and sprue at the top. The reservoir of molten metal in the sprue acts as a riser and the sprue is movable so that it follows the shrinking slab and continues to feed molten metal to the casting cavity to compensate for shrinkage during solidification. When the metal solidifies, the mold is disassembled to remove the slab thus cast.