Die casting system and method utilizing sacrificial core

Patent metadata

Field	Value
Publication number	US-9908175-B2
Application number	US-201414449248-A
Country	US
Kind code	B2
Filing date	Aug 1, 2014
Priority date	Nov 5, 2010
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A method for die casting a component includes inserting at least one sacrificial core into a die cavity of a die comprised of a plurality of die elements. Molten metal is injected into the die cavity. The molten metal is solidified within the die cavity to form the component. The plurality of die elements are disassembled from the component, and the at least one sacrificial core is destructively removed from the component.

First claim

What is claimed is:

1. A die casting system, comprising:
a die comprised of a plurality of die components that define a die cavity;
a sacrificial core assembled to said die and received within said die cavity, said sacrificial core made of a metallic material;
a shot tube in fluid communication with said die cavity; and
a shot tube plunger moveable within said shot tube to communicate a molten metal into said die cavity.

2. The die casting system as recited in claim 1 , wherein said sacrificial core includes a refractory metal core.

3. The die casting system as recited in claim 2 , wherein said refractory metal core includes a protective coating.

4. The die casting system as recited in claim 2 , wherein said refractory metal core includes a leading edge portion, a trailing edge portion and a central portion extending between said leading edge portion and said trailing edge portion.

5. The die casting system as recited in claim 4 , wherein said leading edge portion includes a plurality of bent portions.

6. The die casting system as recited in claim 4 , wherein said central portion includes a plurality of bent portions.

7. The die casting system as recited in claim 1 , wherein said sacrificial core includes a hybrid core that includes a ceramic mated to a refractory metal core.

8. The die casting system as recited in claim 1 , wherein said sacrificial core includes a two-piece refractory metal core.

9. The die casting system as recited in claim 1 , comprising a vacuum source that applies a vacuum to at least said die and said shot tube.

10. The die casting system as recited in claim 1 , comprising a melting unit that communicates said molten metal to said shot tube.

11. The die casting system as recited in claim 10 , wherein said die, said shot tube and said melting unit are disposed within a vacuum chamber to provide a vacuum die casting system.

12. The die casting system as recited in claim 1 , wherein said molten metal includes a high melting temperature material having a melting temperature of at least 1500° F. (815° C.).

13. The die casting system as recited in claim 1 , wherein a perimeter portion of said sacrificial core is captured within a compartment of said die.

14. The die casting system as recited in claim 13 , wherein said perimeter portion of said sacrificial core falls outside of a component cast inside said die cavity.

15. The die casting system as recited in claim 1 , wherein said sacrificial core includes a refractory metal core including a protective coating.

16. The die casting system as recited in claim 15 , wherein said refractory metal core is made of at least one of Mo, Nb, Ta, and W.

17. The die casting system as recited in claim 15 , wherein said protective coating includes at least one of silica, alumina, zirconia, chromia, mullite, and hafnia.

18. The die casting system as recited in claim 15 , wherein said refractory metal core includes a honeycomb shape.

19. The die casting system as recited in claim 1 , wherein said sacrificial core is a refractory metal core made of at least one of Nb, Ta, and W.

20. The die casting system as recited in claim 1 , wherein one or more portions of said sacrificial core are captured and retained in position by a surface of said die.

21. The die casting system as recited in claim 1 , wherein said sacrificial core is contiguous with each of said plurality of die components.

22. A die casting system, comprising:
a die that establishes a die cavity;
a sacrificial core including at least one refractory metal core positioned in said die cavity, said sacrificial core assembled to said die;
a shot tube in fluid communication with said die cavity; and
a shot tube plunger moveable within said shot tube to communicate a molten metal into said die cavity.

23. A die casting system, comprising:
a die that establishes a die cavity;
a sacrificial core including at least one refractory metal core positioned in said die cavity, said sacrificial core assembled to said die;
a shot tube in fluid communication with said die cavity;
a shot tube plunger moveable within said shot tube; and
a molten metal communicable into said die cavity, said molten metal including a high melting temperature material having a melting temperature of at least 1500° F. (815° C.).

Assignees

• United Technologies Corp

Inventors

• Bullied Steven J
• Marcin John Joseph
• Wong Dorothea C

Classifications

• B22D17/20 Primary

  Accessories: Details · CPC title

• Y10T29/4981

  Utilizing transitory attached element or associated separate material · CPC title

• B22D17/14

  Machines with evacuated die cavity · CPC title

• B22D17/203

  Injection pistons (B22D17/2053 takes precedence; for plastics B29C45/53) · CPC title

• B22D29/002

  by leaching, washing or dissolving · CPC title