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:
Jun. 29, 1993
Filed:
Feb. 19, 1992
Applicant:
Inventor:
Edward F Ryntz, Jr, Warren, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D / ; B23P / ; B22D / ;
U.S. Cl.
CPC ...
148538 ; 2940205 ; 2940221 ; 29425 ; 295263 ; 295275 ; 29DI / ; 761071 ; 76DI / ; 164168 ; 164D / ;
Abstract
A process for producing multipiece complementary tooling castings is disclosed in which hollow internal surfaces are cast in a mold having a soft, low strength sand core piece to define such hollow portions and external surfaces are cast against hard, resin-bonded sand mold surfaces. The castings are removed from their respective molds while still warm and nested and pressed together to bring their working surfaces into conformance with each other. The result of this practice is a set of tool pieces that require little machining and display high accuracy in their as-cast condition.