Improvements in the Manufacture of Solid Drawn or Seamless Tubes.
Year: 1888

page_text: Date of Application, 13th Aug., 1888
Complete Specification Left, 21st Dec., 1888
Complete Specification Accepted, 4th May, 1889
Improvements in the Manufacture of Solid Drawn or Seamless
Tubes.
I, WILLIAM PILKINGTON of 74 Green Lanes Birmingham Steel tube drawer do
hereby declare the nature of my said invention to be as follows:-
My invention has reference to the first stage in making solid drawn or seamless
tubes, that is to say the making of the "tube use or hollow ingot.
"
"
I provide a very strong hollow cylindrical mould of iron or steel the internal
diameter of which is the same as the external diameter of the "tube use to be
made.
This cylindrical mould stands vertically, it is open at the top and closed at the
bottom. It is made of ample strength to withstand the pressure to which it is
subjected during the manufacture of the "tube use."
"
I partly fill this cylindrical vessel or mould with melted or partially melted steel
and then I bring it under a solid cylindrical ram or core whose diameter is the same
as the internal diameter of the "tube use so that the ram shall be concentric with
the cylindrical mould-By means of hydraulic or other pressure I then force down
the ram into the melted or partially melted steel in the mould, or I force up the
mould so that the ram or core enters the melted or partially melted steel. The steel
displaced by the ram rises all around it, so that when the ram reaches the bottom
of the mould that part of it which is in the mould is entirely surrounded with fluid
or semi fluid steel, as soon as the steel is cool enough the ram with the steel "tube
use on it is withdrawn from the mould and then the "tube use "is taken off the
ram or core.
In another method of carrying out my Invention I make the hollow cylindrical
mould without a bottom to it and support it on the rising table of a hydraulic press
preferably "checking" the bottom edge of the cylindrical mould into the table-Or
I may make the cylindrical mould in halves securing the halves firmly together when
in use, the halves having projections at the inner side at the bottom which take into
EL
17

page_text: a loose bottom piece, the whole being supported by the hydraulic press table as
" between suitable rolls.
previously mentioned, I may afterwards pass the "tube use
Although I have described my invention in connection with the manufacture of steel
tubes yet I may apply the process to the manufacture of tubes of other metals.
T 12th A nous 1888
THOS. KENDRICK,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Solid Drawn or Seamless
Tubes.
I, WILLIAM PILKINGTON of 74 Green Lane Birmingham, Steel Tube Drawer, do
hereby declare the nature of my said 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 has reference to the first stage in making solid drawn or seamless
tubes, that is to say, the making of the "tube use or hollow ingot.
"
"
I provide a very strong hollow cylindrical mould of iron or steel, the internal
diameter of which is the same as the external diameter of the "tube use
made.
to be
This cylindrical mould stands vertically; it is open at the top, and closed at the
bottom. It is made of ample strength to withstand the pressure to which it is subjected
during the manufacture of the "tube use."
I partly fill this cylindrical vessel or mould with melted or partially molted steel,
and then I bring it under a solid cylindrical ram or core whose diameter is the same
as the internal diameter of the "tube use," so that the ram shall be concentric with
the cylindrical mould-by means of hydraulic or other pressure.
I then force down the ram into the melted or partially melted steel in the mould,
or I force up the mould so that the ram or core enters the melted or partially melted
steel.
The steel displaced by the ram rises all around it so that when the ram reaches the
bottom of the mould, that part of it which is in the mould is entirely surrounded with
fluid or semi fluid steel; as soon as the steel is cool enough the ram with the steel
❝ tube use " on it is withdrawn from the mould and then the "tube use" is taken off
the ram or core.

page_text: In another method of carrying out my Invention I make the hollow cylindrical
mould without a bottom to it, and support it on the rising table of a hydraulic press
preferably "checking" the bottom edge of the cylindrical mould into the table--or I
may make the cylindrical mould in halves, securing the halves firmly together when
in use, the halves having projections at the inner side at the bottom which take into
a loose bottom piece, the whole being supported by the hydraulic press table as
previously mentioned. I may afterwards pass the "tube use" between suitable
rolls.
Although I have described my Invention in connection with the manufacture
of steel tubes, yet I may apply the process to the manufacture of tubes of other
metals.
And in order that this my said Invention may be more fully understood I
shall now proceed more particularly to describe the same and for that purpose
I shall refer to the several figures in the sheets of drawings hereunto annexed
the same letters of reference indicating corresponding parts throughout all the
figures.
Figure 6 is a view in elevation of a mould in position under descending tapered
ram or core.
Figure 7-The tube use or ingot when removed from the tapered ram or core.
No. 3 SHEET OF DRAWINGS.
Figure 8-is a sectional view shewing loose bottom piece with die underneath to
reduce the tube use or ingot.
"
a is the hollow cylindrical mould or vessel, b is the opening at the top, and c, is
the bottom of same. In this said mould or vessel I deposit a certain amount of melted
or partially melted steel as illustrated in Figure 3 (Sheet 1) and Figure 6 (Sheet 2)
I then bring it under the solid cylindrical ram or core d the diameter of which corre-
sponds to the internal diameter of the "tube use or hollow ingot to be made; the
e is the table and the
ram or core d, being concentric with the mould or vessel a.
frame of an hydraulic press carrying the said ram or core d; by means of this or
other pressure I force down this said ram or core d into the melted, or partially
melted, steel in the said mould a. I shew the melted, or partially melted steel at g
Figure 3 (Sheet 1) and Figure 6 (Sheet 2) with the ram or core d, ready to enter g
in the latter case, and partially entered g in the former case, so that, as d descends
into g the latter becomes displaced and rises proportionately so that when the said
ram or core d is at the bottom of the mould or nearly so it is surrounded by the
fluid, or semifluid steel g, which reaches to the top of the mould a, or nearly so: this
is shewn by reference to g¹ Figure 1 (Sheet 1) and Figure 8 (Sheet 3). The tube
use, or hollow ingot, is now formed and when sufficiently cold is removed from the
mould a and then from the ram or core d as shewn at Figure 2 (Sheet 1) and Figure 7
(Sheet 2).

page_text: "
I shew this "tube use or hollow ingot when complete both in the mould a, and
out, by 92 Figure 2. The bottom is very thin now and is removed in any convenient
way so that a hole is through.
In Figure 4 and Figure 5 I illustrate another mode of carrying out my Invention.
I here make the mould a in two halves or sections-this is known as a piece mould
(I may employ more than two sections if required) but having the projections a¹
inside, which engage in the hollow c¹ of the loose bottom c, when arranged together
these three parts are secured by means of the bands and affixed to the rising
table e of the hydraulic press by "checking" into the said table as shewn at
Figure 3 (Sheet 1); or I may construct the hollow cylindrical mould or vessel a,
without the use of a bottom as shewn by the dotted lines c² by affixing or securing it
to the table e, by " checking as above described and shewn also at Figure 3
(Sheet 1) Figure 6 (Sheet 2) and Figure 8 (Sheet 3), in this way the table e serves
as the bottom.
59
"
Having so far described my Invention, as to the mode of making this "tube use
or hollow ingot 2 for cylindrical tubes, I will briefly refer to Figure 6. (Sheet 2)
which is a departure in configuration only, the mould a, and the ram or core d are
constructed to produce a tapered "tube use
,, or hollow ingot.
bottom c.
In Figure 8 (Sheet 3) I shew the hollow cylindrical mould or vessel a, checked
into the table e at c¹, and supported by i. e is the bottom which slides to and fro in
the table e, and can be removed without interfering or the removing of the mould a,
when the ram or core d is pressed by means above set forth into the melted or
partially melted metal as g', and g² is formed, the ram or core d being near to the
c is removed and the pressure continued which brings the ram d, and the
"tube use 37
or hollow ingot upon it, against and through the reducing die or plate m,
the object being to reduce the "tube use" or hollow ingot and elongate it as shewn
at 93, to free the tube use, now g³, from the ram or core d, a slot plate is introduced
sufficiently large to pass d at d¹, but too small to allow y³, so that by reversing the
pressure or action upon d it will now ascend, and g³ will engage against the slot
plate and be stopped, and thus released from the ram or core d, falling into the
space n.
This "tube use is now brought to the required length or diameter and finished
by the process of drawing or rolling separate or combined in a well known manner.
In the foregoing Specification I have set forth my Invention in connection with
the manufacture of Steel tubes but the same process is also applicable to the manu-
facture of tubes of other metals or alloys. I have also set forth in the said Specifica-
tion the manufacture of the 66
"
tube use
or hollow ingot by the employment of
cylindrical or tapered moulds, but I may employ moulds of any required configuration
to assist in the making of solid drawn or seamless tubes.
The above being my said Invention I wish it to be observed in conclusion that I
do not confine myself to the precise details or arrangement of parts as shewn on the
accompanying sheets of drawings, but that I hold myself at liberty to alter or modify
the same without departing essentially from my said Invention.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is
First The construction and application of a cylindrical mould a, open at the top
at b, and closed at the bottom c, for receiving melted or partially melted steel (or
other metals) in combination with the ram or core d, substantially for the purpose
as hereinbefore set forth and described.
Second-The construction and application of a cylindrical mould a, open at the top
at b, and having no bottom, the bottom being formed by the table e upon which it
bears, for receiving melted or partially melted steel (or other metals) in combination
with the ram or core d, substantially for the purpose as hereinbefore set forth and
described.

page_text: Third-The construction and application of a cylindrical mould a, made in two or
more halves or sections with projections a' for receiving the loose bottom c, and
bound together by the bands h, open at the top at 6 for receiving melted or partially
melted steel (or other metals) in combination with the ram or core d substantially
for the purpose as hereinbefore set forth and described.
Fourth-The construction and application of a tapered or other shaped mould a
having an opening at the top b, and closed at the bottom as c or the said bottom
formed and fitted to the mould a as c¹ or the said bottom formed by checking to
the table e for receiving melted or partially melted steel (or other metals) in combi-
nation with the ram or core d, substantially for the purpose as hereinbefore set forthi
and described.
Fifth The construction and application of a cylindrical mould a, open at the top
at 6 for receiving melted or partially melted steel (or other metals) with the bottom c,
to slide from the table e to allow g² to pass through m the reducing die and the
introduction of the slot plate at d¹ for releasing 93 in combination with the ram or
core d substantially for the purpose as hereinbefore set forth and described.
Sixth-The general construction combination and arrangement of parts
before described and illustrated on the accompanying sheets of drawings the whole
forming.
"Improvements in the manufacture of solid drawn or seamless tubes."
as herein-