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:
Mar. 08, 1988
Filed:
May. 21, 1987
Tsuneyuki Ide, Yamaguchi, JP;
Kazunori Nakano, Yamaguchi, JP;
Masaru Inoue, Yamaguchi, JP;
Yoshikazu Kondo, Yamaguchi, JP;
Toyo Kohan Co., Ltd., Tokyo, JP;
Abstract
A process of making a composite of a sintered layer on a metal core member, such as an extruder screw having a sintered hard layer on a steel core, by charging a green compact sintering powder material into a space between an inner surface of a compressible mold and an outer surface of a mold core, sealing the compressible mold with the green compact material and the mold core therein, isostatic pressing the sealed compressible mold with the green compact material and the mold core therein, removing the mold core from the isostatically pressed green compact thus forming a cavity therein, inserting a metal core in the cavity in the isostatically pressed green compact with the metal core having a smaller transverse cross-section than the previously removed mold core and shrinking and bonding the isostatically pressed green compact onto the metal core by heating the isostatically pressed green compact and the metal core to a temperature at which the isostatically pressed green compact is sintered resulting in shrinkage thereof and bonding of the sintered material onto the metal core.