Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1986-08-22
1987-12-01
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164459, 164418, B22D 1100
Patent
active
047097477
ABSTRACT:
A process and an apparatus are disclosed for reducing macrosegregation adjacent to a longitudinal centerline of a solidified cast body. Such cast bodies are preferably large size aluminum alloy ingots made in a continuous casting mold. The ingot is formed from a pool of molten metal having flow currents present therein. The flow currents tend to detach the tips of dendrites growing around the edge of the liquid pool and transport them to the center of the ingot. These detached dendrites, which are lean in eutectic elements, cause negative macrosegregation of the cast ingot. The process includes the step of weakening the magnitude of the flow currents within the liquid pool by placing a mechanical damper therein. The mechanical damper reduces shear acting on the dendrites and minimizes detachment and transport of dendrite particles to the center of the solidified body. The magnitude of the flow currents can also be reduced by increasing the metal head of the liquid pool or by reducing the kinetic energy of newly added molten metal. The apparatus claims a mechanical damper consisting of two or more parallel plates or concentric rings which extensively increases the surface area within the liquid pool. The plates or rings are spaced apart so as to provide flow passages for the molten metal which encourages laminar flow and tends to reduce turbulence within the pool.
REFERENCES:
patent: 3464812 (1969-09-01), Utech et al.
patent: 3477494 (1969-11-01), Burkart et al.
patent: 3702152 (1972-11-01), Bryson
patent: 3842895 (1974-10-01), Mehrabian et al.
patent: 4071072 (1978-01-01), McCubbin
patent: 4214624 (1980-07-01), Foye et al.
"Dendrite Cell Size", R. E. Spear and G. R. Gardner, A.F.S. Transactions; 71; 1963; pp. 209-215.
"Macrosegregation: Part I", M. C. Flemings and G. E. Nereo, Transactions of the Metallurgical Society of AIME, vol. 239, Sep. 1967, pp. 1449-1461.
"Interdendritic Fluid Flow and Macrosegregation; Influence of Gravity", R. Mehrabian, M. Keane, and M. C. Flemings, Metallurgical Transactions, vol. 1, May 1970, pp. 1209-1220.
"Macrosegregation in Aluminum Alloy Ingot Cast by the Semicontinuous Direct Chill Method", H. Yu and D. A. Granger, Symposium Held at NASA Lewis Research Center, Cleveland, Oh., Sep. 12-13, 1984, pp. 157-168.
Granger Douglas A.
Yu Ho
Aluminum Company of America
Connelly Thomas J.
Lin Kuang Y.
LandOfFree
Process and apparatus for reducing macrosegregation adjacent to 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 and apparatus for reducing macrosegregation adjacent to , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and apparatus for reducing macrosegregation adjacent to will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1925739