Method for locating insert in cast iron

• US 4,008,747 A
• Filed: 09/15/1975
• Issued: 02/22/1977
• Est. Priority Date: 11/04/1974
• Status: Expired due to Term

• Current Assignee: General Motors Corporation (General Motors Company)
• Original Assignee: General Motors Corporation (General Motors Company)
• Inventors: Felske, William L., Devers, Melvin W.
• Primary Examiner(s): Vlachos, Leonidas
• Application Number:
  US05/613,473
• Time in Patent Office: 526 Days
• Field of Search: 164/9, 164/23, 164/91, 164/98, 164/10, 164/11, 164/112, 164/231, 164/236, 164/332
• US Class Current: 164/9
• CPC Class Codes: B22D 19/00 Casting in, on, or around objects which form part of the product B22D23/04 takes precedence; alumino-thermic welding B23K23/00; coating by casting molten material on the substrate C23C6/00
• CPC Class Codes: F01D 21/045 special arrangements in stators or in rotors dealing with breaking-off of part of rotor
• CPC Class Codes: F01D 25/14 Casings modified therefor double casings F01D25/26

Abstract

A cast iron gas turbine engine block has an integrally formed internal wall configuration which defines a centrally located exhaust gas passage through the block and a radially outwardly located cooling air passage for directing cooling gas around the exhaust gas passage, a pair of separate inner walls are spaced apart and each includes a plurality of integrally formed circumferentially arranged posts thereon directed into the passage and having the tip portions thereon formed in situ of side grooves on a steel turbine wheel containment ring: the ring of posts in each of the side wall grooves of the ring locate it radially outwardly of an annular inner wall of the cast iron housing and form air flow openings around the ring to enable the cooling air directed through the cooling air passage to completely surround and circulate around the ring for cooling it during turbine operation. The invention also contemplates an improved method for retaining a steel containment ring within a cast iron turbine engine block.

Claims

1. A method for manufacturing a cast metal member with containment ring comprising:

the steps of preforming a metal ring to have spaced apart parallel side walls each including an annular groove formed continuously circumferentially therearound, forming a core box having a planar extent including a first reference surface therein surrounded by a plurality of circumferentially spaced upstanding posts, centering the metal ring to locate the posts on said core box in alignment with one groove on one side of said ring to provide a three point location of said ring with respect to said reference surface therein, forming a core box cover having a second reference surface thereon surrounded by a plurality of circumferentially spaced posts thereon each located radially outwardly of said second reference surface and being located within the other groove of said ring when the cover is placed on said core box, directing core sand into said core box for forming a sand core continuously around the inside and outside diameter of said ring for thermally insulating the exposed surfaces of said ring, withdrawing said posts to form a plurality of holes directed into either side of said core each in communication with one of said grooves, placing the core into a mold box, directing molten metal into the mold to fill the holes formed in the sand core around said metal ring whereupon solidification of the cast metal will form an in situ plurality of integral posts between the cast metal and the ring to locate the ring internally thereof.

2. A method for manufacturing a turbine engine block with containment ring comprising the steps of;

preforming a metal ring to have spaced apart parallel side walls each including an annular groove formed continuously circumferentially therearound, forming a core box having a planar extent including a first reference surface therein surrounded by a plurality of circumferentially spaced upstanding posts, centering the metal ring to locate the posts on said core box in alignment with one groove on one side of said ring to provide a three point location of said ring with respect to said reference surface therein, forming a core box cover having a second reference surface thereon surrounded by a plurality of circumferentially spaced posts thereon each located radially outwardly of said second reference surface and being located within the other groove of said ring when the cover is placed on said core box, directing core sand into said core box for forming a sand core continuously around the inside and outside diameter of said ring for thermally insulating the exposed surfaces of said ring, withdrawing said posts to form a plurality of holes directed into either side of said core each in communication with one of said grooves, placing the core into a mold box for a cast turbine engine block directing molten metal into the mold to fill the holes formed in the sand core around said metal ring whereupon solidification of the cast metal will form an in situ plurality of integral posts between the cast block and the ring to locate the ring internally thereof, and shaking the core material from around the ring to produce an internal cooling passage with access to the inside and outside diameter of the ring for cooling the ring internally of the block.