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. 29, 1988
Filed:
Mar. 19, 1987
Masayuki Matsuzaki, Chiba, JP;
Tomihachi Kumehara, Kumagaya, JP;
Hitachi Carbide Tools, Ltd., Narita, JP;
Abstract
A sleeve assembled in a casting apparatus through which a molten metal is fed into a die cavity, characterized in that at least part of said sleeve on which the molten metal impinges or flows fast under high pressure is made of cemented carbide consisting essentially of a hardening phase of WC, part of which may be substituted by TaC, NbC, TiC, etc., and 10-20 weight % based on the cemented carbide of a binder phase comprising Co, Ni, Cr, and optionally Mo, a weight ratio of Cr+Mo to the binder phase being 0.1-0.2 and a weight ratio of Mo to Cr being up to 3. This sleeve, when assembled in a die-casting apparatus or a low-pressure casting apparatus, enjoys an extremely long life because of its high resistance to oxidation and washing.