Improvements in the Drawing and Rolling of Tubes to Varying Transverse Section and Apparatus for that Purpose.
Year: 1899

page_text: Date of Application, 6th Feb., 1899
Complete Specification Left, 28th Oct., 1899-Accepted, 23rd Dec., 1899
Improvements in the Drawing and Rolling of Tubes to Varying
Transverse Section and Apparatus for that Purpose.
1. HENRY JOHN WADDIE, of Landore, Glamorganshire, Wales, Engineer, do
hereby declare the nature of this invention to be as follows:-
a regular
My invention relates to means of drawing and rolling tubes to
Dirregular taper or to a varying transverse section at different parts of their
length.
For this purpose I employ as a die a pan of 1ollers geared together so as
to evolve at equal surface speed in opposite directions, each having a circum-
ferential groove shaped to half the transverse section of the tube, that section
varying at different parts of the circumference it may be in the same order
and proportion as the desned variations of the tube
While the rollers evolve, the tube to be operated on, preferably heated, is
dawn though between them at any desired speed, the vanations of section
being thus made over lengths of the tube proportional to the speed at which
it is made to travel relatively to the surface speed of the rollers. If the rollers
remain at rest while the tube is drawn, the section of the tube will be uniform.
Dated this 6th day of February 1899
ABEL & IMKAY.
Agents for the Applicant.
Improvements in the Drawing and Rolling of Tubes to Varying
Transverse Section and Apparatus for that Purpose,
19
I. HENRY JOHN WADDIE, of Landore, Glamorganshne, Wales, Engineer, do
hereby declare the nature of this invention and in what manner the same
to be performed to be particularly described and ascertained in and by the
following statement. ---
My invention relates to means of drawing and rolling tubes to a regulat
or regular taper or to a varying transverse section at different parts of their
length
For the purpose of drawing a tube, I employ as a die a pair of 1ollers geared
together so as to revolve at equal surface speed in opposite directions, each
having a circumferential groove shaped to half the transverse section of the
tube, that section vaiving at different parts of the circumference, it may be
in the same order and proportion as the desired vauations of the tube.

page_text: While the rollers revolve, the tube to be operated on preferably heated, 18
drawn though between them at any desired speed, the variations of section
being thus made over lengths of the tube proportional to the speed at which
it is made to travel relatively to the surface speed of the rollers. If the rollers
remain at rest while the tube is drawn, the section of the tube will be uniform.
Obviously rods, wires or the like may be similarly operated on.
Fig. 1 of the accompanying drawings is a side view and Fig 2 is a front view
of apparatus for operating according to my invention. Figs. 3 and 4 are trans-
verse sections, drawn to an enlarged scale, of the pair of rollers which constitute
the varying die, shewing diagrammatically the positions of the rollers relatively
to a taper drawn tube at the beginning and the end of the draw.
Each of two equal rollers ab has cut in its circumference a taper groove
corresponding in shape to the half section of the tube to be drawn. As shewn
in the figures the section is taken to be a circle, but obviously it might be
a square or symmetrical polygon and it may vary in shape as well as in
dimensions at different parts of the circumference. On the axis of the 1ollers
are equal pinions cd gearing with one another, one of them gearing with any
suitable mechanism that can cause them to revolve at any desired speed.
As shewn in Fig. 1 the pinion c gears with a rack which may be pulled or
pushed by any suitable power. The circumferential groove is deepest and
widest at the point e and then becomes gradually less deep and less wide
1ound the greater part of the circumference to the point f If the rollers are
turned together to any desired position and held at rest while a tube is drawn
through between them, then the tube will be throughout its length of the
same section as that of the grooves at the point where the tube is tangential
to them But if, while the tube is being drawn, the rollers also evolve in the
direction of the arrows in Figures 3 and 4, the tube will be drawn taper, the
taper being uniform if the speed of revolution of the rollers bears a constant
ratio to the speed of the tube and the tape being varied if the ratio of these
speeds be varied.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is :-
1. The herein described method of forming tubes to constant or varying
section by drawing them through a pair of rollers having tapering circum-
ferential grooves, while the rollers are held at rest or turned during the drawing.
2. Apparatus for drawing tubes, comprising a pair of 1ollers geared together
and formed with tapered circumferential grooves, substantially as described.
Dated this 28th day of October 1899.
ABEL & IMRAY,
Agents for the Applicant.