Improvements in Casting Metals.
Year: 1894

page_text: PROVISIONAL SPECIFICATION.
Improvements in Casting Metals.
I, PAUL HUTH of Gelsenkirchen, Germany, Civil Engineer, do hereby declare
the nature of this invention to be as follows:-
My invention relates to improvements in casting of two or more metals
centrifugally during one operation in rotating moulds.
These metals may be of different kinds, they may be of different combinations or
alloys, or they may be of the same kinds, but of different degrees of hardness, and
they may also be of different specific weights.
To show for instance one way in which my improvement in casting may be
applied, I would state :-When casting a carwheel I first cast the hard metal into
the rotating mould, when the liquid metal will be thrown by the centrifugal force to
the periphery of the mould thus forming the wearing surface, the rim, or the tire
of the wheel of the harder metal; then I pour the softer metal into the mould until
it is filled, thereby forming the non-wearing and centre parts of the wheel.
When casting shells the hard metal will be cast first into the mould, filling the
bottom and thus form the point of the shell; the centrifugal force however will
drive some of the liquid metal upward on the sides of the mould, leaving a conical
cavity in the centre into which the softer metal will flow, filling up the cavity and
the remainder of the mould.
Dated this 5th day of November 1894.
S. S. BROMHEAD,
97 Newgate Street, London, E.C., Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Casting Metals.
I, PAUL HUTH of Gelsenkirchen Germany, Civil Engineer do hereby declare
the nature of this invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
My invention relates to improvements in centrifugally casting of two or more
metals during one operation into rotating moulds. These metals may be of
different kinds, they me be of different combinations or alloys, or they may be of
the same kinds, but different degrees of hardness, and they may also be of different
specific weights.
The metal first cast into the rotating mould is thrown to the periphery and is
raised in such a manner as to form a parabolic curve to correspond with the
velocity of the rotation. The second metal fills the remainder of the mold,
absolutely adhering to the first metal.
In the accompanying drawing Figs. 1 and 2 represent a car wheel and Fig. 3 a
shell for artillery purposes.
In the car wheel the harder metal, which is to form the outer part of the rim,
may be fed through hub b, or through a ring shaped slot g in the mould, while the
latter is revolving at a calculated speed, this metal filling the space a, b, c, d, in
which line a, b, represents the parabole, whose vertex lies at M; the softer metal
1 Prive Qui]

page_text: is then fed, forming the inner part of the rim a, b, e, f, and the other parts of the
wheel.
As soon as the mould is sufficiently filled rotation is stopped.
The parabole a, b, M, depends upon the radius of the wheel and the velocity of
the rotation.
When casting shells (Fig. 3) the bard metal will be cast first into the mould,
filling the bottom, thus forming the point of the shell, the centrifugal force
however will drive some of the liquid metal upwards, on the sides of the mould,
leaving a conical cavity in the centre, into which the softer metal will flow, filling
up the cavity and the remainder of the mould etc.
As a matter of course other objects may be cast in a similar way.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is:-
The process of casting centrifugally two or more different metals, mixtures of
metals, or of one metal of different degrees of hardness, by which process, in
consequence of the rotation of the mould the metals settle in the mould in separate
upright standing layers.
Dated this 27th day of July 1895.
S. S. BROMHEAD,
97 Newgate Street, London, Patent Agent.