Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1993-08-02
1994-12-27
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
B22D 2702
Patent
active
053756479
ABSTRACT:
A process of reducing macrosegregation in the casting of a metal alloy ingot is disclosed. The process includes introducing a molten metal alloy into a casting mold cavity, cooling the molten metal alloy to form a solid zone, a liquid-solid mushy zone overlying the solid zone, a liquid zone overlying the liquid-solid mushy zone and a melt surface on the liquid zone, employing during the cooling at least one substantially static magnetic field having at least two planes of symmetry which intersect on the longitudinal axis of the ingot, generating the magnetic field by at least one coil means having an inner region through which the metal alloy passes, energizing the coil means by a substantially static electrical current wherein the current follows a path defined by the coil means and passes around at least one of the molten metal alloy and the zones, improving the strength and uniformity of the magnetic field by at least one ferromagnetic flux path, and dampening convection flows of the molten metal alloy which cause macrosegregation by means of the magnetic field. An associated apparatus suitable for casting metal alloys and an improved ingot having a refined equiaxed grain structure and a reduced pore size are provided.
REFERENCES:
patent: Re32529 (1987-10-01), Vives
patent: 1721357 (1929-07-01), Siler
patent: 2861302 (1956-08-01), Mann et al.
patent: 2944309 (1954-09-01), Schaaber
patent: 3842895 (1974-10-01), Mehrabian et al.
patent: 3911997 (1975-10-01), Sugazawa et al.
patent: 4014379 (1977-03-01), Getselev
patent: 4126175 (1978-11-01), Getselev
patent: 4321959 (1982-03-01), Yarwood et al.
patent: 4446909 (1984-05-01), Yarwood et al.
patent: 4458744 (1984-07-01), Yarwood et al.
patent: 4479531 (1984-10-01), Whittington
patent: 4495981 (1985-01-01), Kindlmann et al.
patent: 4523628 (1985-06-01), Vives
patent: 4530404 (1985-06-01), Vives
patent: 4709747 (1987-12-01), Yu et al.
patent: 4723591 (1988-02-01), Vives et al.
patent: 4842043 (1989-06-01), Andersen et al.
patent: 4933005 (1990-06-01), Mulcahy et al.
Pirich et al, "Thermal and Solutal Convection damping Using an Applied Magnetic Field", Washington Microgravity Sci. and Appl., NAS8-34922, pp. 77-78, May 1985.
M. D. Sahu et al, "Effects of Electromagnetic Fields on Solidification of Some Aluminum Alloys", British Foundryman, vol. 70, Part III, pp. 89-92., (1977).
R. Ambardar et al, "Grain Coarsening by Solidification in a Steady Magnetic Field", Aluminum, vol. 62(6), pp. 446-448, (Jun. 1986).
R. Ambardar et al, "Effect of steady Magnetic Field on the Structure of Unidirectionally Solidified Metal Alloy Castings", Transactions of the Indian Institute of Metals, vol. 40, No. 1, Feb. 1987, pp. 22-26.
D. R. Uhlmann et al, "The Effect of Magnetic Fields on the Structure of Metal Alloy Castings", Transaction of the Metallurgical Society of AIME, vol. 236, Apr., 1966, pp. 527-531.
Fang Que-Tsang
Hildeman Gregory J.
Miksch Edmond S.
Aluminum Company of America
Lin Kuang Y.
Pearce-Smith David W.
LandOfFree
Process for ingot casting employing a magnetic field for reducin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for ingot casting employing a magnetic field for reducin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for ingot casting employing a magnetic field for reducin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-912338