Improvements in the Manufacture of Plates, Bars, Rods, and the like having a Partial Coating of other Metal.
Year: 1892

page_text: Date of Application, 24th Nov., 1892-Accepted, 14th Jan., 1893
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Plates, Bars, Rods, and the
like having a Partial Coating of other Metal.
I, LOUIS GRAMBOW, of Rixdorf, near Berlin in the Empire of Germany,
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 :-
The object of this invention is the manufacture of plates, bars, rods and the like
of two metals, the main part of such plate, rod or bar, or what may be called the
support thereof, being made of harder metal (iron, steel or the like), while it is
provided, on one side only (or partly), with a superficial layer of softer metal (such
as copper).
The essential novel feature of the process is, that two plates, bars or the like are
in each case covered with the soft metal simultaneously. For this purpose the two
pieces are placed in juxtaposition or superposed so that their plane surfaces meet,
while the exposed sides are wholly or partly covered with the softer metal.
The process is carried out in practice in the following manner.
Supposing it is desired to make plates of sheet iron having a coating of copper
on one side, two iron plates of the proper shape a a Fig. 1, are placed one upon the
other. Then there is cast or otherwise applied round the double core a a a shell or
case of the copper or other covering metal, while the ends may either be also
wholly or partly covered or remain exposed.
The blank thus obtained is then submitted to a rolling process, by being first
pressed between shaping rollers (Fig. 2), the combined effect of the heat and
pressure being, thoroughly to join the core or shell, without however causing the
two plates to adhere to each other.
The plate thus obtained is cut into slabs (as indicated in Figs. 2 and 3) in the
manner usual in the sheet metal manufacture, the edges e e forming part of the
sheet of copper S, being in the natural course of operation removed during the sub-
sequent rolling of the slabs, although they may, if necessary, be cut off by suitable
shears or otherwise removed. In this manner two plates are obtained each covered
with copper on one side, and capable of being worked as though they were made
entirely of one metal.
To avoid any difficulty in subsequently separating the two plates or pieces.
placed against each other and forming the core a a, some separating material may be
interposed between them, before they are connected to form the core.
A great
variety of materials may be employed for this purpose, such as paper, graphite,
asbestos, or the like.
In Fig. 1 of the accompanying drawings it has been assumed that the two core-
pieces a a are of equal thickness. It may however happen that their thickness is
unequal as exemplified in Fig. 4, in which case two metal sheets or plates of
different thickness will be obtained as a final product. Again the thickness of the
copper or other shell or casing, cast around the core, need not be of equal thickness
on all sides, the final product in this case being two plates having each a different
thickness of copper or like metal on its surface. The shape of the core-pieces may
vary according to the nature of the articles it is desired to turn out.
In the manu-
facture of rods of half-circular section, for example, provided with a coating of
copper on the rounded side, while it is desired that the flat side should remain
uncovered, it will be seen that no difficulty whatever will be encountered. Two
rods of the desired shape are simply put together so that their flat sides meet, and
the cylindrical core thus obtained is provided with a coating of copper. When this

page_text: is done the blank is rolled in the ordinary way, after which it only remains for it
to be cut or split through the centre so as to separate the two rods (Fig. 5).
Figs. 6, 7, 8 and 9 illustrate the application of the process to pieces of other
shapes in section covered with the coating on all sides except the contact surface.
As before stated other metals may be used instead of copper (for the shell) or iron
(for the body), it being only essential that the body should consist of the harder
metal of the two, and the shell or coating of the softer metal.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,―
1. A process of manufacture of plates bars rods or the like of hard metal coated
on one or more sides with a comparatively soft metal in carrying out which two
plates or other articles are placed in juxtaposition or superposed so that their flat
surfaces meet there being if necessary placed between these a sheet or layer of
suitable insulating material such as paper asbestos graphite or the like the shell or
coating of the soft metal being then cast around the two united pieces after which
the blank obtained is properly shaped or finished in a rolling mill the protruding
ends consisting of the metal employed for coating the blank either dropping off of
their own accord or being removed by suitable tools the final product being two
plates or pieces covered partly (on one or more sides) with the desired metal coating
and which are capable of being worked just as if they consisted entirely of one
metal.
2. The manufacture of sheets plates bars and the like of relatively hard metal
covered with a coating of relatively soft metal by placing together two pieces of
the hard metal covering them with the soft metal and afterwards dividing them
substantially as described.
3. The process for partly coating metal sheets plates bars and the like substan-
tially as described.
Dated this 24th day of November 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicant.