Improvements in the Manufacture of Tubes of Aluminium and its Alloys.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Tubes of Aluminium and
its Alloys.
I REINHARD ISIDORE ROMAN of 31 Lombard Street London Metallurgical
Chemist, do hereby declare the nature of this invention to be as follows:-
Hitherto tubes of aluminium and its alloys have usually been made out of a
blank which involves over 20 per cent. of waste in addition to the expense of rolling
and cutting the blanks. Now according to my invention the metal is poured into
the form of a tube directly from the crucible.
For the purpose of my invention I provide a mould through which a mandrel
preferably steel is inserted for the purpose of making the billet hellow. I form
the mould with one or more hollow wings through which the molten metal for
filling the mould is poured when the mould is in an upright position. I attribute
some importance to the temperature at which the metal is run into the mould
and I prefer that this temperature should be 600° to 700° C. The mould is
usually made in halves with suitable clamps for connecting the two halves together
and with a screw piece at the top for fixing the mandrel in position.
Immediately after the mould including the hollow wing or wings have been
filled with the metal the mould is removed from its stand, the billet ejected and
the mandrel immediately driven out. Previous to the running in of the metal.
the mould should be coated with graphite, red lead, French chalk or other suitable
material. I prefer to coat the mandrel with soap in addition so as to facilitate
its easy removal immediately the metal has been poured into the mould.
After the billet has been removed from the mould the part or parts formed
by the hollow wing or wings are sawn off and the billet is milled or scraped.
The billet may now be taken to an annealing furnace where it is annealed at
a temperature not exceeding 400° C. after which it is rolled in a grooved roll
and then may be drawn in the ordinary way with frequent annealing between the
passes.
Dated this 20th day of October 1895
J. C. MEW BURN & ELLIS,
55 and 56 Chancery Lane, London, Chartered Patent Agents.
Improvements in the Manufacture of Tubes of Aluminium and
its Alloys.
I, REINHARD ISIDORE ROMAN of 31 Lombard Street in the City of London,
Metallurgical Chemist, 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 :-
Hitherto tubes of aluminium and its alloys have usually been made from blanks,
a method which involves over 20 per cent. of waste, in addition to the expense of
rolling and cutting the blanks. Now according to my invention the metal is
poured into the form of a tube directly from the crucible.

page_text: For the purpose of my invention, I provide a mould through which a mandrel,
preferably steel, is inserted for the purpose of making the billet hollow. I form
the mould with one cr more hollow wings through which the molten metal for
filling the mould is poured when the mould is in an upright position, and which
become filled with the molten metal, so that as the metal in the mould shrinks as
it solidifies, the shrinkage is made good by the metal in the wing. I attribute
some importance to the temperature at which the metal is run into the mould, and
I prefer that this temperature should be 630° to 650° C. The mould is usually
made in halves with suitable clamps for connecting the halves together and with a
screw piece at the top for fixing the mandrel in position.
Figure 1 of the accompanying drawings is an elevation of a mould suitable for
the purpose of my invention.
Figure 2 is a plan of the same.
Figure 3 is a section on the line 3 3 of Figure 1.
Figure 4 is a section of the mould on the line 4 4 of Figure 2.
Figure 5 shows in vertical section and Figure 6 in plan the casting round the
mandrel.
Figure 7 is a stand by means of which the mandrel is ejected.
Referring to the drawings, A is the mould, B the mandrel which is kept true by
means of the collar C. The mould is provided with a hollow wing D, the metal
being poured through a hole E in the wing D. Opposite the hollow wing D is a
solid wing D' which balances the wing D.
The mould is kept in an upright position by means of handles F. The mould is
made in two parts for the purpose of enabling the casting to be removed; the two
parts can be kept together by suitable clamps. G is the casting and H is the
block or stand provided with a hole J by means of which the mandrel B is driven
out of the casting, the mandrel and casting being placed upon the stand with the
end of the mandrel in the hole J, and the mandrel being then driven out by means
of a hammer.
Immediately after the mould, including the hollow wing or wings have been
filled with the metal the mould is removed from its stand, the billet ejected and
the mandrel immediately driven out. Previous to the running in of the metal the
mould should be coated with graphite, French chalk or other suitable material.
I prefer to first coat the mandrel with soap in addition, so as to facilitate its easy
removal.
After the billet has been removed from the mould the part or parts formed by
the wing or wings are sawn off and the billet is milled or scraped.
The billet may now be taken to an annealing furnace where it is annealed at a
temperature not exceeding 400° C., after which it is rolled in a grooved roll and
may then be drawn in the ordinary way with frequent annealing between the
passes.
Having now particularly described and ascertained the nature of my said inven-
tion and in what mauner the same is to be performed, I declare that what I
claim is :―
1. The manufacture of tubes of aluminium or aluminium alloys by casting them
in moulds having one or more hollow wings, substantially as and for the purpose
set forth.
2. The manufacture of tube billets of aluminium or aluminium alloys, sub-
stantially by the means and in the manner described,
Dated this 20th day of Tule 1906
J. C. MEWBURN & ELLIS,
55 and 56 Chancery Lane, Loudon, Chartered Patent Agents.