Improvements in the Manufacture of Weldless Tubes and Wires by Rolling.
Year: 1897

page_text: Date of Application, 6th May, 1897
Complete Specification Left, 13th Jan., 1898-Accepted, 5th Mar., 1898
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Weldless Tubes and Wires by
Rolling.
I, HEINRICH EINHARDT, of 20, Reichstrasse, Dusseldorf, Germany, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to a method of manufacture by means of which tubes of
large diameter and having any desired thickness as well as long tubes of Al small
internal diameter and wires may be produced. For this purpose the heated block
or billet is first formed and punched in the longitudinal direction with a central
hole according to any commonly known method, say, according to the method
described in the Specification to my Patent No. 3116 of 1891, "Improvements in
forging and shaping iron and steel blocks." The block or billet may be completely
perforated, or, preferably, it remains closed at one end. Into the hollow rod a
thus prepared, as at Figure 2 of the accompanying drawing, there is
then introduced a solid rod k, the diameter of which is somewhat smaller
than the inside diameter of the hollow rod, whereupon the two rods, pushed one
into the other, are rolled out in a suitable train of rolls to the desired diameter
(Figures 3 and 4). I obtain in this manner by rolling out each couple of rods a
double product, viz., a solid round rod and a tube enclosing the solid
rod, or in rolling wire: a solid wire and a hollow wire enclosing the
solid one and the inside diameter of which corresponds nearly to the
diameter of the solid wire. The tube or the hollow wire is then
stripped off from the round rod or from the solid wire respectively. In this manner
ulso several concentric hollow wire rods, such as a, b and c, may he rolled together
with a solid wire forming the inner core, as at Figure 5, so that at the same
time several hollow wires of different thicknesses and different inside diameters,
and an inner solid wire are obtained.
To prevent the tubes from becoming welded to the inner core, it is advisable
to heat the latter, when introduced into the hollow rods, to a temperature which
is somewhat lower than that of the hollow rols. The welding may also be obviated
by means of oxide-layers or by coating the solid round rod with a thin layer of
infusorial earth, asbestos-powder, calcined magnesia, milk of lime, or in any other
suitable manner.
The above described method is also suitable for working ingot-iron and ingot-
steel as well as copper and other rollable metals and metallic alloys.
In manufacturing tubes and wire from ingot-iron or ingot-steel, the hollow wire
may also be covered inside, and the solid wire outside, with copper or with other
metals.
I proceed in this case in such manner that, after the hole has been formed in the
billet, a shell (Figure 6), of suitable thickness of copper or of the corresponding
other metal, is pressed into the cavity of the holed billet, so that it bears tightly
against the inner wall of the hollow of the billet. If the solid wire to be pro-
duced together with the hollow wire is also to be coppered over or to be coated with
another metal, a tube e (Figure 7) of copper or of the corresponding metal is
pushed over the solid round rod, fitting thereto as closely as possible, whereupon
the solid rod or core is introduced into the cavity of the billet. The tubes may

page_text: of course also be coated both inside and outside with copper or with any other
metallic layer.
1000
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Weldless Tubes and Wires by
Rolling.
I, HEINRICH EHRHARDT, of 20, Reichstrasse, Dusseldorf, 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: —
This invention relates to a method of manufacture by means of which tubes of
large diameter and having any desired thickness as well as long tubes of a small
internal diameter and wires may be produced. For this purpose the heated block
or billet is first formed and punched in the longitudinal direction with a central
hole according to any commonly known method, say, according to the method
described in the Specification to my Patent No. 3116 of 1891, Improvements in
forging and shaping iron and steel blocks." The block or billet may be completely
perforated, or, preferably, it remains closed at one end. Into the hollow rod a
thus prepared, as at Fig. 2 of the drawing accompanying my Provisional Specifica-
tion there is then introduced a solid rod k; the diameter of which is somewhat smaller
than the inside diameter of the hollow rod, whereupon the two rods, pushed one
into the other, are rolled out in a suitable train of rolls to the desired diameter
(Figs. 3 and 4). I obtain in this manner by rolling out each couple of rods a
double product, iz, a solid round rod and a tube enclosing the solid
rod, or in rolling wire: a solid wire and al hollow wire enclosing the
solid one and the inside diameter of which corresponds nearly to
diameter of the solid wire. The tube or the hollow wire is then
stripped off from the round rod or from the solid wire respectively. In this manner
also several concentric hollow wire rods, such as a, b and c, may be rolled together
with a solid wire forming the inner core as at Fig. 5, so that at the same
time several hollow wires of different thicknesses and different inside diameters,
and an inner solid wire are obtained.
the
To prevent the tubes from becoming welded to the inner core, it is advisable
to heat the latter, when introduced into the hollow rods, to a temperature which
is somewhat lower than that of the hollow rods. The welding may also be obviated
by means of oxide-layers or by coating the solid round rod with a thin layer of
infusorial earth, asbestos-powder, calcined magnesia, milk of lime, or in
suitable manner.
any other
The above described method is also suitable for working ingot-iron and ingot-
steel as well as copper and other rollable metals and metallic alloys.
In manufacturing tubes and wire from ingot-iron or ingot-steel, the hollow wire
may also be covered inside, and the solid wire outside, with copper or with other
metals.
I proceed in this case in such manner that, after the hole has been formed in the
billet, a shell (Figure 6), of suitable thickness of copper or of the corresponding
other metal, is pressed into the cavity of the holed billet, so that it bears tightly
against the inner wall of the hollow of the billet. If the solid wire to be pro-
duced together with the hollow wire is also to be coppered over or to be coated with
another metal, a tube c (Fig. 7) of copper or of the corresponding metal is

page_text: pushed over the solid round rod, fitting thereto as closely as possible, whereupon
the solid rod or core is introduced into the cavity of the billet. The tubes may
of course also be coated both inside and outside with copper or with any other
metallic layer.
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. A method of manufacturing simultaneously seamless hollow wires and solid
wires or seamless tubes and solid round rods from ingot iron, ingot steel or other
malleable metal or metallic alloy consisting in introducing into a hollow billet or
metallic block a solid rod the diameter of which is somewhat smaller than the
inside diameter of the hollow billet or metallic block, in then rolling out the whole
at rolling heat to the desired diameter, and in then withdrawing the solid wire or
solid round rod from the seamless tube or seamless hollow wire rolled out to the
desired thickness, such rolling being effected by any suitable known means,
substantially as described with reference to the drawing.
2. A method for coating the inner surface. of the hollow wire or of the tube
manufactured as set forth in Claim 1, with copper or with any other malleable
metal or metallic alloy, consisting in inserting into the previously hollowed billet
or into the previously hollowed metallic block a seamless shell of suitable thickness
of copper or of any other malleable metal or metallic alloy, in then introducing
the solid round rod into the hollow billet and in then rolling out the whole,
substantially as set forth with reference to the drawing.
3. A method of manufacturing hollow wires and tubes as set forth in Claim 1,
which tubes are to be coated inside and outside with copper or with other malleable
metal or metallic alloy, consisting in introducing the previously hollowed billet
into a seamless shell of suitable thickness of copper or of other metal, in then
inserting into the previously hollowed billet a second seamless shell of suitable
thickness of copper or of other metal and in introducing the solid round rod into
the cavity of the billet whereupon the whole is rolled out and the hollow wire or
cylindrical tube is separated from the solid wire substantially as described with
reference to the drawing.
Dated this 12h of Low 18OS
ABEL & IMRAY,
Agents for the Applicant.