Improvements in the Manufacture of Steam-boiler Flues and other like Tubular Articles of Metal.
Year: 1890

page_text: Date of Application, 25th Mar., 1890
Complete Specification Left, 10th Dec., 1890-Accepted, 31st Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Steam-boiler Flues and other
like Tubular Articles of Metal.
I, SAMSON Fox, of the Leeds Forge, Leeds, in the County of York, Civil
Engineer, do hereby declare the nature of this invention to be as follows:-
According to my invention a steam-boiler flue or other like tubular article is
made from a plate of mild steel without a welded or riveted joint by the use of a
collapsible male die or dies in conjunction with a female die of peculiar construc-
tion having in its interior a series of annular ridges or surfaces of different internal
diameters, that of the largest diameter being at or nearest to the entrance end and
the remaining annular ridges or surfaces being made of successively smaller and
smaller diameter down to the innermost which is succeeded by that portion of the
die designed to impart the final shape to the metal operated upon and whose
internal diameter corresponds practically to the external diameter of flue to be
produced.
The mild steel plate which may previously be cut to an approximately circular
shape is heated and afterwards is forced into the wide mouthed die by means of a
male die or dies, the die or dies being operated by hydraulic or other suitable
power, and by causing the plate in this way to be acted upon successively by each
of the annular ridges or surfaces and to be forced through the female die, the
required circular form is imparted to the plate which, if necessary is to be with-
drawn from the die, re-heated and replaced as required for the purpose set forth.
In lieu of or in addition to the annular ridges or surfaces within the wide
mouthed portion of the female die it may be constructed with ridges or projections
arranged longitudinally within the die but inclined to its longitudinal axis, the
object being to reduce friction in passing the plate through the die which
however must at its smallest part conform in its internal configuration to the
external formation of the required flue or tube.
Dated this 25th day of March 1890.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Steam-boiler Flues and other
like Tubular Articles of Metal.
I, SAMSON Fox, of the Leeds Forge, Leeds, in the County of York, Civil
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 :-
According to my invention a steam-boiler flue or other like tubular article is
made from a plate of mild steel without a welded or riveted joint by the use of
a collapsible male die in conjunction with a female die of peculiar construction
having in its interior a series of annular ridges or surfaces of different internal
diameters, that of the largest diameter being at or nearest to the entrance end and
the remaining annular ridges or surfaces being made of successively smaller and
smaller diameter down to the innermost which is succeeded by that portion of the
die designed to impart the final shape to the metal operated upon and whose
internal diameter corresponds practically to the external diameter of flue or tubular
article to be produced,

page_text: The mild steel plate which may previously be cut to an approximately circular
shape with a central hole is suitably heated and afterwards is forced into the wide
mouthed die by means of a male die the die being operated by hydraulic or other
suitable power, and by causing the plate in this way to be acted upon successively
by cach of the annular ridges or surfaces, and to he forced through the female dic,
the required circular form is imparted to the plate which, if necessary, is to be
withdrawn from the die, re-heated and replaced as required for the purpose set
forth.
The manner of carrying my invention into practical effect is illustrated in the
annexed drawings whereof
Fig. 1 shews the male die in elevation and the female die (which is constructed
in two main parts) in central vertical section these dies being in the relative
positions they occupy preparatory to their operating upon a plate which is shewn
in section in position to be acted upon and is supposed to have been cut to a
circular or approximately circular form to have had a circular hole punched or
otherwise formed in its centre, and to have been heated to a bright bright red heat
(say 900° Fal. or thereabout).
Fig. 2 illustrates the completion of the first stage of the pressing operation.
Fig. 3 shows the male die in elevation and the lower part of the female die in
vertical section, the top part or corrugated approach of the female die having been
removed in order to form a flange around the one end of the tubular article being
produced.
Fig. 4 illustrates the completion of the operation of forming a tubular article such
as a flue with flange at one end.
Fig. 5 is a sectional elevation of the male die.
Fig. 6 is a sectional plan at A. B. Fig. 5.
Fig. 7 is a sectional elevation of the male die and loose punch hereinafter
referred to.
Fig. 8 is a sectional plan at C. D. Fig. 7.
??
The plate having been cut to the required size with hole in centre, heated to a
suitable temperature as before stated and placed upon the upper part of the female
die a as in Fig. 1, one of the dies is then caused to approach the other (by any
suitable means, hydraulic or otherwise) and thus as the operation proceeds the male
die forces the plate a down into the female die a until the parts assume the
relative positions shown in Fig. 2. The top part of the female die which is made
in two parts bolted or clamped together is removed (without withdrawing the male
die and plate) when the operation has arrived at the stage illustrated in Fig. 2;
then the operation is continued until the flange g is formed as shewn in Fig. 3.
Then the adjustable collar d, which is made in two parts bolted together the bolt
holes being counter sunk so that the heads of the bolts are flush with the outside of
the collar, is removed, and the loose punch 63 is inserted in the male die b and the
operation completed as shown in Fig. 4.
The collapsible male die as shown in Figs. 5, 6, 7, and 8 is composed of three
main segmental pieces and three pieces 62 12 12 each of a
cross section
approximately triangular with the corners removed these parts and 62 being
adapted at their inner sides as shown in Fig. 9 to receive two steel rings cc whereby
the parts are held together. The punch 63 is inserted as shown in Fig. 4 for
the purpose of pressing out the end of the tube .c.
When the operation has been completed the male die is removed as follows:-
The punch is first withdrawn, then the steel rings cc and the triangular
pieces 222 and finally the segmental pieces bbb.
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
The hereinabove described improvements in the manufacture of steam-boiler flues
and other like tubular articles of metal according to which a steam-boiler flue or

page_text: other like tubular article is made by pressing a suitably heated plate of mild stee
by means of apparatus comprising a collapsible male die and a female die having in
its interior a series of annular ridges or surfaces of different internal diameters, that
of the largest diameter being at or nearest to the entrance end, and the remaining
annular ridges or surfaces being made of successively smaller and smaller diameter
down to the innermost, which is succeeded by that portion of the die designed to
impart the final shape to the metal operated upon, and whose internal diameter
corresponds practically to the external diameter of flue or tubular article to be
produced substantially as hereinabove described with reference to and illustrated in
the drawings hereunto annexed.
1 1.
1
בדי
1000
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.