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:
Jan. 23, 1996
Filed:
May. 17, 1994
Tomoo Takenouchi, Hokkaido, JP;
Yoshiaki Ichinomiya, Hokkaido, JP;
Junji Ishizaka, Hokkaido, JP;
Junji Itagaki, Tokyo, JP;
Shuzo Ohhashi, Hokkaido, JP;
Tsukasa Azuma, Hokkaido, JP;
Yasuhiko Tanaka, Hokkaido, JP;
The Japan Steel Works, Ltd., Tokyo, JP;
Abstract
A process for producing a turbine rotor using an ingot in which segregation is prevented effectively when ESR is used to produce a large-sized ingot. A hole is formed along an axial direction in the core of an electrode. The molten pool is made shallow and flat and segregation is prevented from occurring. Consequently, an ESR ingot of good quality offering an excellent surface is obtainable as it is free from segregation. Moreover, an electrode melting rate is increased and efficiency is improved so that a high quality turbine can be manufactured from the ingot.