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:
Oct. 25, 1988
Filed:
Jun. 23, 1982
Gerald K Ruhlandt, Madison Heights, MI (US);
Timothy W Skszek, Rochester, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A metal die casting apparatus preferably comprises a plunger core and a stationary core adapted to form recesses in the casting and to densify the metal to reduce shrink porosity. The cores are located at opposite sides of a die cavity and the plunger core is moveable in the direction of the stationary core to penetrate the metal while in a partially solidified, extrudable state. The cores are suitably shaped to displace metal laterally as the plunger core advances. The apparatus is particularly suited for forming a casting comprising an enlarged region intended to define a bore completely therethrough and surrounded by dense, nonporous metal.