The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1993
Filed:
Jul. 29, 1992
Applicant:
Inventors:
John W Kuhn, Bristol, IN (US);
Richard J Wylie, Wabash, IN (US);
Jerome D VanAelst, Wabash, IN (US);
Assignee:
CMI International, Inc., Southfield, MI (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22D / ;
U.S. Cl.
CPC ...
164127 ; 164365 ;
Abstract
A method of eliminating solidification shrinkage porosity defects in cast metal articles includes disposing an expanded polystyrene chill (36) within a preformed mold cavity (26) and thereafter introducing molten metal into the cavity (26) and vaporizing the chill member (36), whereby the heat of vaporization rapidly cools a localized region of the molten metal adjacent the chill member and accelerates solidification thereof enabling remote still-molten metal to feed solidification shrinkage in this region and prevent the formation of porosity defects that would otherwise result.