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Title:
METHOD FOR MANUFACTURING METAL INGOT
Document Type and Number:
WIPO Patent Application WO/2018/190424
Kind Code:
A1
Abstract:
A method for manufacturing a metal ingot using an electron-beam melting furnace provided with an electron gun in which the irradiation position of an electron beam can be controlled and a hearth for retaining a molten metal raw material, wherein an irradiation line is disposed so that a lip part is blocked in a downstream region of a surface of the molten metal between a first side wall and an upstream region in which the metal raw material is supplied, and two end parts are positioned in the vicinity of a side wall of the hearth. On the irradiation line, a first electron beam is radiated to the surface of the molten metal, and the first electron beam is radiated to the irradiation line. The surface temperature (T2) of the molten metal in the irradiation line is thereby made higher than the average surface temperature (T0) of the surface of the molten metal overall within the hearth, and a molten metal flow from the irradiation line upstream in the direction toward the opposite side from the first side wall is formed in the surface of the molten metal.

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Inventors:
FUNAGANE HITOSHI (JP)
HAMAOGI KENJI (JP)
Application Number:
PCT/JP2018/015555
Publication Date:
October 18, 2018
Filing Date:
April 13, 2018
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22B9/22; B22D11/00; B22D11/041; B22D21/06; B22D27/02; B22D43/00; C22B34/12; C22C14/00
Domestic Patent References:
WO2008078402A12008-07-03
Foreign References:
JP2004276039A2004-10-07
JP2004232066A2004-08-19
JP2013001975A2013-01-07
JP2004232066A2004-08-19
Other References:
TAO MENG, FACTORS INFLUENCING THE FLUID FLOW AND HEAT TRANSFER IN ELECTRON BEAM MELTING OF TI-6A1-4V, 2009
See also references of EP 3611278A4
Attorney, Agent or Firm:
KAMEYA, Yoshiaki et al. (JP)
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