Casting apparatus

• US 6,848,497 B2
• Filed: 04/15/2003
• Issued: 02/01/2005
• Est. Priority Date: 04/15/2003
• Status: Expired due to Fees

• Current Assignee: Pyrotek Incorporated
• Original Assignee: Pyrotek Incorporated
• Inventors: Collins, Richard J., Sale, Alan R., Tremblay, Sylvain P.
• Primary Examiner(s): Stoner, Kiley S.
• Assistant Examiner(s): LIN, ING HOUR
• Application Number:
  US10/414,119
• Publication Number:
  US 20040206473A1
• Time in Patent Office: 658 Days
• Field of Search: 164/439, 164/437, 164/486, 164/487, 164/488
• US Class Current: 164/439
• CPC Class Codes: B22D 11/0401 Moulds provided with a feed head
• CPC Class Codes: B22D 11/103 Distributing the molten metal, e.g. using runners, floats, distributors

Abstract

A metal distribution system for the simultaneous production of a plurality of logs or round billets from molten metal comprising: 1) a trough for the introduction of molten metal; 2) a plurality of side streams extending from the trough and each of the side streams including a plurality of opposing apertures each of the apertures including a thimble for the shaping of molten metal passing through the trough and the side streams and into the thimbles. A uniform flow of molten metal into the side streams and the individual apertures is provided by the controlled negative angular orientation of the most upstream opposing pair of apertures thereby providing relative uniformity of the temperature of molten metal reaching each of the plurality of apertures. A unique unitized thimble configuration and trough damming arrangement are also described.

Claims

1. An integral molten metal casting insert comprising:

A) a cylindrical cross feeder having an interior surface of a first diameter;

B) a cylindrical thimble having an interior surface of a second diameter; and

C) integral backup insulation all formed as a single monolithic structure with said cross feeder interior surface and said thimble interior surface comprising a continuous, joint free and uninterrupted cylindrical insert surface peripherally surrounded by said integral back-up insulation.

2. The integral molten metal casting insert of claim 1 wherein said cylindrical crossfeeder and said thimble are fabricated from a refractory material and said back-up insulation comprises a castable insulating material.

3. The integral molten metal casting insert of claim 2 wherein said refractory material is a low density refractory material.

4. The integral molten metal casting insert of claim 3 wherein said low density refractory comprises a fiber glass fabric impregnated with a wollastonite slurry.

5. The integral molten metal casting insert of claim 2 wherein said castable insulating material comprises phosphate bonded mineral foam composed primarily of calcium silicate.

6. Metal distribution system for casting molten metal comprising:

A) a primary trough

B) plurality of secondary troughs flowably connected to said primary trough, each of said secondary troughs having an upstream end abutting said primary trough and a downstream end remote from said primary trough;

C) a plurality of opposing pairs of apertures arranged along said secondary troughs into which metal entering said secondary troughs pours for the casting of molten metal into solid metal, that opposing pair of said apertures closest to said primary trough being designated as the first opposing pair; and

D) entry angles at each of said apertures of said first opposing pair;

said entry angles being negative angles such that metal entering said secondary troughs flows first to apertures located downstream of said first opposing pair and only initiates filling of said first opposing pair once filling of apertures downstream thereof have commenced filling.

7. The metal distribution system of claim 6 further including dams at the entry to each of said secondary troughs.

8. The metal distribution system of claim 7 further including a dam control arm that permits remote operation of said dams.

9. The metal distribution system of claim 8 wherein said dam control arm is pneumatically or hydraulically operated.

10. The metal distribution system of claim 6 wherein said entry angle ranges from about 15 to about 30 degrees.

11. The metal distribution system of claim 10 wherein said entry angle ranges from about 20 to about 25 degrees.

12. A metal distribution system for casting molten metal comprising:

A) a primary trough;

B) a plurality of secondary troughs flowably connected to said primary trough, each of said secondary troughs having an upstream end abutting said primary trough and a downstream end remote from said primary trough;

C) a plurality of opposing pairs of apertures arranged along said secondary troughs into which metal entering said secondary troughs pours through for casting of molten metal into solid metal;

D) entry angles at each point where each of said apertures joins said secondary troughs; and

E) in each of said apertures, an integral molten metal casting insert comprising;

I) a cylindrical crossfeeder having an interior surface of a first diameter;

II) a cylindrical thimble having an interior surface of a second diameter; and

III) integral back-up insulation;

all formed as a single monolithic structure with said crossfeeder interior surface and said thimble interior surface comprising a continuous, joint free and uninterrupted cylindrical insert surface peripherally surrounded by said integral back-up insulation;

said entry angles being negative angles such that metal entering said secondary troughs flows first into apertures located at said downstream ends of said secondary troughs thereby causing said secondary troughs to till with molten metal from the downstream ends to the upstream ends.

13. The metal distribution system of claim 12 further including dams at the entry to each of said secondary troughs.

14. The metal distribution system of claim 13 further including a dam control arm that permits remote operation of said dams.

15. The metal distribution system of claim 14 wherein said dam control arm is pneumatically or hydraulically operated.

16. The metal distribution system of claim 12 wherein said cylindrical crossfeeder and said thimble are fabricated from a refractory material and said back-up insulation comprises a castable refractory.

17. The metal distribution system of claim 16 wherein said refractory material is a low density refractory composite material.

18. The metal distribution system of claim 17 wherein said low density refractory comprises fiber glass fabric impregnated with a wollastonite slurry.

19. The metal distribution system of claim 16 wherein said castable insulating material comprises a phosphate bonded mineral foam composed primarily of calcium silicate.