# US 4,392,805 A · Centrifugal casting apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,392,805 A - Document ID: US4392805A - Status: Granted - Kind: A - Application number: 06/202,703 - Filed: 1980-10-31 - Granted: 1983-07-12 - Earliest claimed: 1980-10-31 - Inventors: Oleg L. Golyak; Leonty A. Golyak; Ivan R. Stepurenko - Web page: https://patentgrep.com/patent/US4392805A ## CPC - B29C 31/04: Feeding {of the material to be moulded}, e.g. into a mould cavity {(B29C39/08 takes precedence; using a material distribution system to two or more fixed injection moulds B29C45/125)} - B22D 13/04: of shallow solid or hollow bodies, e.g. wheels or rings, in moulds rotating around their axis of symmetry - B22D 13/10: Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings (making or lining moulds B22C) - B22D 13/107: {Means for feeding molten metal} - B29C 41/36: Feeding the material on to the mould, core or other substrate - C03B 19/04: by centrifuging {(C03B19/095 takes precedence)} - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22) - C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES ## Abstract A centrifugal casting apparatus comprises a mold mounted for rotation about the vertical axis thereof and having a bottom provided with a through axial opening. A member having a helicoidally shaped surface is axially mounted within the opening in the bottom. The member has a lower portion to be immersed into a melt and extending out of the opening and downwardly of said bottom of the mold. The mold and the member are connected with a rotation drive and a vertical motion drive. ## Claims ### Claim 1 A centrifugal casting apparatus for casting from a melt comprising: a mold mounted for rotation about the vertical axis thereof and having a bottom provided with a through co-axial opening having vertical walls; a member having a helicoidally shaped surface, co-axially mounted within said mold for preventing shrink heads formation and having a lower portion extending through said opening outwardly and downwardly of said mold bottom, said member being adapted to be immersed into said melt for cleaning its surface from slag; a rotation drive connected with said mold and said member; and a vertical motion drive connected with said mold and said member. ### Claim 2 (depends on 1) An apparatus, as claimed in claim 1, wherein said member is a screw. ### Claim 3 (depends on 2) An apparatus, as claimed in claim 2, wherein the ratio between the diameter of said screw and the diameter of said opening in said bottom is from 0.1 to 1. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein said member has the form of a helicoidally shaped plate which is essentially a screw. ### Claim 5 (depends on 2) An apparatus, as claimed in claim 2, wherein said screw has a length equal to the height of said mold. ### Claim 6 (depends on 2) An apparatus, as claimed in claim 2, wherein the flight of said screw has the form of a tube having an open lower end and an open upper end. ### Claim 7 (depends on 2) An apparatus, as claimed in claim 2, wherein said screw is a multiple-start one. ### Claim 8 (depends on 7) An apparatus, as claimed in claim 7, wherein said screw is provided with a number of flights which corresponds to 2 to 6 starts. ### Claim 9 (depends on 2) An apparatus as claimed in claim 2, wherein said screw and said mold are differentially connected with the rotation drive. ### Claim 10 (depends on 9) An apparatus, as claimed in claim 9, wherein said screw and said mold are mounted on the ends of co-axially arranged output shafts of a differential gear having an input shaft connected to said rotation drive. ### Claim 11 (depends on 10) An apparatus, as claimed in claim 10, wherein said differential gear has a gear ratio which enables the ratio between the angular speed of the screw and that of the mold to be maintained within the range of 1 to 2. ### Claim 12 (depends on 1) An apparatus, as claimed in claim 1, wherein said member is rigidly connected with said mold. ### Claim 13 (depends on 12) An apparatus, as claimed in claim 12, wherein said member has the form of helicoidally arranged protrusions on the inner surface of said opening in said bottom of said mold. ### Claim 14 (depends on 12) An apparatus, as claimed in claim 12, wherein said member is an impeller having blades secured to said bottom of said mold.