Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By stirring or mixing molten metal
Reexamination Certificate
2000-02-28
2001-11-13
Andrews, Melvyn (Department: 1742)
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By stirring or mixing molten metal
C075S684000, C075S708000, C164S098000, C164S312000
Reexamination Certificate
active
06315944
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method of the kind set forth in the preamble of claim
1
.
BACKGROUND ART
In methods of this kind, it is known to cast so-called metal matrix composite materials (MMC) in a batch-wise manner, i.e. preparing a batch of the mixture of molten metal and solid particles in a suitable furnace, from which the mixture is transferred to the moulds by means of ladles. Apart from the low rate of production as compared to modern mass-production casting, the known method suffers from the disadvantage that the solid particles tend to sink to the bottom of the furnace, as they are usually heavier than the metal. This will obviously imply a risk of differences in the concentration of particles from one casting to the next.
DISCLOSURE OF THE INVENTION
It is the object of the present invention to provide a method of the kind referred to above, with which it is possible to produce castings with a uniform concentration of particles at a high rate of production, and this object is achieved with a method of said kind, according to the present invention also comprising the features set forth below. By proceeding in this manner, the concentration of particles in the molten metal is kept constant, at the same time as the filling of the moulds is carried out at a rate consistent with modern methods of mass production.
The present invention also relates to a plant for carrying out the method according to the invention. This plant is of the kind set forth below, and according to the invention, it also comprises the features set forth below.
Advantageous embodiments of the method and the plant according to the invention, the effects of which—beyond what is obvious—will be evident from the following detailed part of the present description, are set forth hereinafter, respectively.
REFERENCES:
patent: 5524699 (1996-06-01), Cook
patent: 5531425 (1996-07-01), Skibo et al.
Andersen Uffe
Iversen Peter Møller
Andrews Melvyn
Georg Fischer Disa A/S
Larson & Taylor PLC
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