Terry Holmgren resumes & CV records
Resumes
Terry C Holmgren, 59627 Elliott Ave, Ishpeming, MI 49849
Terry Holmgren Phones & Addresses
618 Maurice St, Ishpeming, MI 49849 906-4829153 906-4864960
1113 N 3Rd St, Ishpeming, MI 49849 906-4829153
278 N Seymour St #J207, Fond du Lac, WI 54935 906-4864960
Houghton, MI
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Terry C Holmgren
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Publications & IP owners
Us Patents
Method Of Expendable Pattern Casting Using Sand With Specific Thermal Properties
US Patent:
5355931, Oct 18, 1994
Filed:
Sep 9, 1993
Appl. No.:
8/119035
Inventors:
Raymond J. Donahue - Fond du Lac WI
Terrance M. Cleary - Allenton WI
William G. Hesterberg - Rosendale WI
Terry C. Holmgren - Ishpeming MI
Terrance M. Cleary - Allenton WI
William G. Hesterberg - Rosendale WI
Terry C. Holmgren - Ishpeming MI
Assignee:
Brunswick Corporation - Skokie IL
International Classification:
B22C 702
US Classification:
164 34
Abstract:
A method of producing dimensionally predictable metal castings utilizing an expendable polymeric foam pattern along with unbonded sand having specific thermal properties. The pattern, formed of a material such as polystyrene, has a configuration corresponding to that of the article to be cast. The pattern is placed with an outer flask and unbonded sand surrounds the pattern as well as filling the cavities in the pattern. The sand has a linear expansion of less than 1% from 0. degree. C. to 1600. degree. C. , a heat diffusivity greater than 1500 J/m. sup. 2 /. degree. K/S1/2, an AFS grain fineness number of 25 to 33, and an AFS base permeability number of 450 to 500. A molten metal, such as an aluminum alloy or a ferrous alloy, is fed into the mold in contact with the pattern causing the pattern to vaporize with the vapor being entrapped within the interstices of the sand while the molten metal fills the space initially occupied by the foam pattern to produce a cast article. The physical properties of the sand enable articles to be cast having more precise and predictable tolerances.
Method Of Expendable Pattern Casting Of Hypereutectic Aluminum-Silicon Alloys Using Sand With Specific Thermal Properties
US Patent:
5355930, Oct 18, 1994
Filed:
Sep 9, 1993
Appl. No.:
8/119027
Inventors:
Raymond J. Donahue - Fond du Lac WI
Terrance M. Cleary - Allenton WI
William G. Hesterberg - Rosendale WI
Terry C. Holmgren - Ishpeming MI
Terrance M. Cleary - Allenton WI
William G. Hesterberg - Rosendale WI
Terry C. Holmgren - Ishpeming MI
Assignee:
Brunswick Corporation - Skokie IL
International Classification:
B22C 702
US Classification:
164 34
Abstract:
A method of producing a casting utilizing an expendable polymeric foam pattern along with unbonded sand having specific thermal properties. The pattern, formed of a material such as polystyrene, has a configuration corresponding to that of the article to be cast. The pattern is placed with an outer flask and unbonded sand surrounds the pattern as well as filling the cavities in the pattern. The sand has a heat diffusivity greater than 1500 J/m. sup. 2 /. degree. K. /s1/2. The molten hypereutectic aluminum silicon alloy is fed into the flask in contact with the pattern causing the pattern to vaporize with the vapor being entrapped within the interstices of the sand while the molten metal fills the space initially occupied by the foam pattern to produce a cast article. The thermal properties of the sand reduces the particle size of the precipitated primary silicon particles in the casting, thereby increasing the machinability of the casting.
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