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    • 6. 发明专利
    • METAL MELTING CRUCIBLE
    • JPH02171587A
    • 1990-07-03
    • JP33008288
    • 1988-12-26
    • KAWASAKI REFRACTORIES CO LTDNIPPON SHEET GLASS CO LTD
    • OKAMOTO TAKESHITANAKA SEIJIROKAWAKAMI TATSUONAKAI HIDEMIMAEDA MASATOSHI
    • F27B14/10
    • PURPOSE:To ensurely perform metal melting to make possible repeated use by drilling a through hole in the bottom wall of a metal melting crucible made of ceramic used to mount on an electrically conductive base earthed. CONSTITUTION:A metal M is heated on the basis of electron beam irradiation (e) in vacuum on metal melting. The metal M melted by the electron beam irradiation (e) is allowed to flow in a through hole 1a in the bottom wall of a crucible 1, comes in contact with the upper part of an electrically conductive base 2 to cool so as to solidify as it is in contact with the base 2. The melting metal M of the crucible 1 is earthed through the metal M solidified in the trough hole 1a and the electrically conductive base 2 in contact with the solidified metal M and electrification of the meting metal M in the crucible is prevented thereby. Accordingly, the metal melting crucible 1 surely performs metal melting with the use thereof and a bumping phenomenon by over- electrification of the melting metal M is prevented. Since the crucible 1 is made of ceramic, it endures repeated use and difficult to wear without reaction with the melting metal M and the permeation of the melting metal M.
    • 7. 发明专利
    • MANUFACTURE OF WEAR RESISTING METAL PIPE
    • JPH01169190A
    • 1989-07-04
    • JP32622287
    • 1987-12-23
    • KAWASAKI REFRACTORIES CO LTD
    • OKAMOTO TAKESHITANAKA SEIJIROKAWAKAMI TATSUO
    • F16L9/14F16L58/14
    • PURPOSE:To easily further simply perform processing work by heating a metal pipe to a temperature of shrinkage fitting thereafter inserting pipe-shaped ceramics into the metal pipe interposing a molded material dispersedly providing voids. CONSTITUTION:A molded material 3 can be inserted between a metal pipe 1 and a pipe-shaped ceramics 2, internally inserted into the metal pipe 1, and the molded material 3, which dispersedly provides voids forming a cross sectional shape coming into contact with peripheral walls of the metal pipe 1 and the pipe-shaped ceramics 2 when the material 3 is inserted, is prepared. As the molded material 3, a corrugated plate, formed into a pipe-shape in a manner wherein its corrugated section appears in the peripheral direction, or the like is applied. After the metal pipe 1 is heated to a temperature of shrinkage fitting, the pipe-shaped ceramic 2 is inserted interposing the molded material 3 into the metal pipe 1, and being based on the shrinkage following a decrease of temperature of the metal pipe 1, it holds the pipe-shaped ceramics 2 to be fixed under interposition of the molded material 3.
    • 9. 发明专利
    • ELECTRODE FOR ELECTRIC DISCHARGE MACHINE
    • JPH0197523A
    • 1989-04-17
    • JP25407887
    • 1987-10-07
    • KAWASAKI REFRACTORIES CO LTD
    • OKAMOTO TAKESHITANAKA SEIJIROKAWAKAMI TATSUO
    • B23H1/06
    • PURPOSE:To improve fine precision machining efficiency, by a method wherein a title electrode is formed by a graphite material, formed by mesocarbon microbeads with a grain size of 20mum or less serving as a raw material and having given density, bending strength electric ratio resistance, an anisotropic ratio, and a thickness of 0.5-0.03mm. CONSTITUTION:An electrode for electric discharge machining with a width of 0.5mm or less and having an electrode consumption ratio being high enough to allow a practical use is formed by a graphite material formed by mesocarbon microbeads with a grain size of 20mum or less serving as a raw material and having characteristics, e.g. density of 1.75g/cm or more, bending strength of 500-1300kgf/cm , electric ration resistance of 800-2000muOMEGAcm, and an anisotropic ratio of 1.05 or less and processed 0.5-0.03mm in thickness. The electrode is suitable for fine precision machining and an electrode consumption ratio can be sharply decreased. Further, even when a machining speed is increased, a granular protrusion is difficult to generate, and machining efficiency can be improved.