Georg Fischer Disa, Inc.

Emerson Climate Technologies Gmbh

Scott S Hendrie

Raymond F Witte

Pheroze J Nagarwalla

Warren G Williamson

Paul Michael Korzenecki

Methods of casting improved scroll compressor components having high quality involute portions are provided. The casting method comprises gating molten metal through a patterned region of a core or mold defining the involute vanes. In certain aspects, during casting, molten metal passes through one or more gates that extend through a core in a central patterned region that forms the involute portion of the scroll component. In certain variations, the metal comprises a gray cast iron, so the cast part comprises an involute having a matrix of pearlite and Type A graphite that is substantially free of undercooling defects. Further, in certain variations, the involute portion is substantially free of Types B-E graphite. Thus, high-quality low-defect cast scroll components are formed having good machinability and superior fatigue strength.

Methods of casting scroll compressor components

A cope for a core box has a passage for passing sand into a core box cavity and a bore for passing catalyst into the core box cavity to harden a sand core formed therein. The bore may extend from an exterior surface of the cope to the cope passage. The cope may have structure for forming a seal with a sand injection tube following sand injection, such as a blow-up seal or an O-ring. A method of producing cores in a core box includes the step of providing a cope, a drag, and a cavity formed therebetween, the cope having a passage for receiving an injection tube and a bore for passing catalyst. Further steps include using the injection tube to inject sand through the cope passage into the cavity and passing catalyst through the bore in the cope into the cavity. A seal may be formed between the cope and the injection tube after sand injection.

Cope with bore for gassing cores

The injection tube for injecting and gassing of foundry sand in cavities in a core box has a first passage for passing sand and a second passage for passing hardening fluid. Sand may be injected simultaneously to the introduction of hardening fluid into the cavities. Alternatively, sand may be injected prior to introduction of hardening fluid into the cavities.

Apparatus and methods for injecting and gassing of sand

A core box assembly for molding cores includes a first core box and a second core box disposed above the first core box. Each of the core boxes has a cavity. A passage for delivering core material to the cavities in the core boxes extends through the second core box and into the first core box. The second core box is placed above the first core box and core material is injected into the core boxes.

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Coldwater, MI, United States of America

Scott S Hendrie