Improved Method of and Apparatus for the Manufacture of Dense Metal Castings, and of Sheet Metal and Wire therefrom.
Year: 1890

page_text: Date of Application, 1st Feb.. 1890
Complete Specification Left, 4th Mar, 1890-Accepted, 19th Apr., 1890
PROVISIONAL SPECIFICATION.
Improved Method of and Apparatus for the Manufacture of Dense
Metal Castings, and of Sheet Metal and Wire therefrom.
I, GEORG HÖPER of 35 Garten Strasse Iserlohn, in Westphalia, Kingdom of
Prussia, German Empire, Manufacturer, do hereby declare the nature of this inven-
tion to be as follows:-
My invention relates to a method of manufacturing dense metal castings, to be
rolled out into sheet metal or formed into wire, which method consists mainly in
casting plates or blocks, of annular form in revolving moulds, the rotation of
the moulds being effected during the casting and until the metal has solidified.
The inner opening of the annular casting can be formed either by the introduc-
tion of a core into the mould or, without such a core, simply by the centrifugal force
imparted to the liquid metal by the rapid rotation of the mould. The latter method
is preferred when the mould is rotated in a vertical position.
With horizontal moulds the casting is effected either from the centre or from the
circumference by suitably arranged gits or channels. With vertical moulds the
casting is best effected from the centre through a casting hole in the one half
mould box that widens towards the inside. The other half mould is preferably
hollowed somewhat at the point opposite the hole, or it may also be formed with
a hole.
The annular plates prepared according to the above described invention may either
have a circular, oval, or otherwise shaped periphery according to the use to which
they are to be applied. They show great density with the fibre of the metal lying in
a circular direction, and are applicable for discs of all kinds that require to have
central holes in them, in particular for coins or tokens, discs or washers for the bases
of cartridge cases, and the like.
They are also specially adapted for the manufacture of wire either by cutting them
into the form of a spiral strip, which is then subjected to a drawing operation or by
cutting them through at one point and then straightening them out to form a bar
which is then drawn in the usual manner. When the discs are cut into spiral strips
they are preferably made with their periphery of a spiral configuration, and before
cutting them through, a spiral groove is cut, on each face so as to facilitate the
spiral cut.
When the discs are to be formed into bars by cutting through and straightening,
they are by preference formed with a larger central hole and the circular burr that is
formed round such hole in casting is cut off, either before or after the ring is cut
through and straightened.
Dated this 1st day of February 1890.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Method of and Apparatus for the Manufacture of Dense
Metal Castings, and of Sheet Metal and Wire therefrom.
I, GEORG HÖPER, of 35 Garten Strasse, Iserlohn, in Westphalia, Kingdom of
Prussia, German Empire, Manufacturer, do hereby declare the nature of this inven-
tion 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 a method of manufacturing dense metal castings, to be
rolled out into sheet-metal or formed into wire, which method consists mainly

page_text: in casting plates or blocks of annular form in revolving moulds, the rotation of
the moulds being effected during the casting and until the metal has solidified.
The inner opening of the annular casting can be formed either by the introduc-
tion of a core into the mould, or, without such a core simply by the centrifugal
force imparted to the liquid metal by the rapid rotation of the mould. The latter
method is preferred when the mould is rotated in a vertical position.
With horizontal moulds the casting is effected either from the centre or from
the circumference by suitable arranged gits or channels. With vertical moulds the
casting is best effected from the centre through a casting hole in the one half mould
box that widens towards the inside. The other half mould is preferably hollowed
somewhat at the point opposite the hole, or it may also be formed with a hole.
Figs. 1 and 2 of the accompanying drawing shew cross sections of moulds con-
structed according to my above described invention, Fig. 1 shewing a horizontal
mould and Fig. 2 a vertical one.
The outer configuration of the cast plates is generally made circular; they may
however have any other configuration according to the purposes to which they are to
be applied, such as oval or irregular shapes; Fig. 3 shews the plan of a circular
casting, and Fig. 4 one of oval shape. The discs thus cast when rolled out in the
usual way, give a sheet metal of great density and uniformity of structure. The
application of the metal when used entire is of course limited to purposes where a
central opening is required, but when cut up, it is particularly suited for small objects
such as coins, washers for cartridge casos and the like.
Such discs can also be readily worked into wire, by cutting them into the form of
a spiral strip or band, commencing at the outer periphery and terminating at the
central hole, as indicated at Fig. 5, the strip thus formed being then drawn in the
usual manner. It is preferable in this application to produce corresponding spiral
grooves in the disc by casting in the first instance, so that the spiral strip to be cut
will then have its molecules laid already in a spiral direction by casting. For this
purpose the mould has its surfaces made of a spiral form, the metal being run in at
the inner end of the spiral. Fig. 6 shews such a mould indicating the manner in
which metal runs in casting.
The separation in a spiral direction of the strip can also be facilitated in thick
discs, by first cutting on each surface thereof two exactly coinciding spiral grooves,
as indicated at the cross section at Fig. 7, the remaining portion being then easily
cut through.
The strip produced will then be of uniform thickness, with chamfered edges,
whereby it will be better prepared for the subsequent drawing operation than an
ordinary cut strip.
The wire produced by the above described means is of great strength, because the
fibre produced in cutting will lie in the same direction as its length.
Annular discs produced as above described can also be used for the production of
straight bars suitable for being formed into rods or wire. For this purpose the
annular disc is cut through at one point and is then straightened out, as indicated
at Fig. 8.
The disc has a comparatively large central hole for this purpose, round which
is formed a circular burr or fin, which may be cut off either before or after it is
straightened out.
The rods, wire &c. obtained by hammering, drawing, rolling &c., from such bars
also possess great strength because in this case also the fibres produced in casting run
in the same direction as their length.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The process for the production of dense castings for sheet metal and wire manu-
facture wherein annular discs are formed by running metal into revolving moulds,
substantially as described.

page_text: 2. An improved manufacture of annular discs or rings produced in the manner
set forth in the preceding claim, such rings being, when required, formed into
bars by cutting them through and straightening them out, substantially as
described.
3. The use for the process referred to in the first claim, of rotating casting
moulds, such as are described with reference to Figs. 1, 2, and 6, the speed of rotation
being such that the central hole of the cast disc or ring either produced by centri-
fugal force, or by a central core, substantially as set forth.
4. In the manufacture of annular discs such as are referred to in the second claim,
the method of cutting spiral grooves on the surfaces thereof for facilitating the cutting
of the disc into a spiral strip, substantially as described.
Dated this 3rd day of March 1890.
ABEL & IMRAY,
Agents for the Applicant.