Improvements in Rolls used for the Manufacture of Iron and Steel Tubes.
Year: 1890

page_text: Date of Application, 28th Feb., 1890
Complete Specification Left, 1st Nov., 1890-Accepted, 13th Dec.. 1800
PROVISIONAL SPECIFICATION.
Improvements in Rolls used for the Manufacture of Iron and
Steel Tubes.
We CHARLES FAULKNER of No. 5 Plough and Harrow Road Edgbaston
Birmingham in the County of Warwick Tube Manufacturer and WILLIAM HENRY
LLOYD of No. 10 Hall Green West Bromwich in the County of Stafford Tube
Manufacturer do hereby declare the nature of this invention to be as follows:-
The rolls ordinarily employed in the manufacture of iron and steel tubes by rolling
the said tubes over a mandril have the general figure of cylinders with opposed
grooves of a nearly semi-circular figure in cross section. The said grooves diminish
progressively in size from one end of the roll to the other the series of grooves in
rolls which we have employed terminating in two special grooves. The grooves by
which the reduction in diameter and elongation of the tube are for the most part
effected we will call the preparing grooves and we will call the first of the two special
grooves referred to the leading groove and the second of the two special grooves the
finishing groove. The last, named groove is truly semi-circular in cross section and
its function is to perfect the shape and surface of the tube after its reduction by the
preparing grooves. The leading groove is very nearly but not quite semi-circular in
cross section and prepares the tube for the finishing groove.
As the leading and finishing grooves can only properly perform their functions so
long as their size and shape remain practically unchanged while the preparing grooves
may undergo a considerable amount of change by wear without their efficiency being
materially diminished the leading and finishing grooves in the rolls become sooner
worn to an extent which impairs their efficiency than the preparing grooves and the
returning of the rolls in consequence has to be more frequently resorted to than
would be necessary if the preparing leading and finishing grooves became worn
equally.
The object of our invention is to remedy the defect referred to and consists in
duplicating both the leading and finishing grooves. That is to say in making according
to our invention rolls for the manufacture of iron and steel tubes we duplicate both
the leading and finishing grooves and in using the said rolls we generally pass the
tube after reduction twice through the leading groove and once through the finishing
groove and when the first leading groove and the first finishing groove are worn we
employ the second leading groove and the second finishing groove.
By this arrangement the work usually thrown upon one leading groove and one
finishing groove is divided between two leading and two finishing grooves and the
time during which the roll retains its efficiency is doubled. We have described but
one roll but the description we have given of one roll applies to the other roll of the
pair of rolls.
In rolls made according to our invention the preparing grooves and the leading
and finishing grooves wear nearly uniformly and require returning at the same
time.
Although we have described leading and finishing grooves only at the end of the
series of reducing grooves yet leading and finishing grooves may be introduced at any
parts of the series of reducing grooves so as to fit the rolls to make tubes of different
sizes. The mandril and appliances we employ are of the ordinary kind and the
reheating of the tabe under operation is effected from time to time as in the ordinary
method of manufacture.
TA 1
1000
W. T. WHITEMAN,
Agent for the Applicants.

page_text: '
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COMPLETE SPECIFICATION.
Improvements in Rolls used for the Manufacture of Iron and
Steel Tubes.
We CHARLES FAULKNER of No. 5 Plough and Harrow Road, Edgbaston,
Birmingham in the County of Warwick Tube Manufacturer and WILLIAM HENRY
LLOYD of No. 10 Hall Green, West Bromwich in the County of Stafford Tube
Manufacturer do hereby declare the nature of our invention and the manner in
"which the same is to be performed to be particularly described and ascertained in
and by the following statement :—
The rolls ordinarily employed in the manufacture of iron and steel tubes by rolling
the said tubes over a mandril have the general figure of cylinders with opposed
grooves of a nearly semi-circular figure in cross section. The said grooves diminish
progressively in size from one end of the roll to the other. The grooves by which
the reduction in diameter and elongation of the tube are for the most part effected
we will call the preparing grooves and we will call the groove preceding the finishing
groove the leading groove and the last groove the tube passes through the finishing
groove. The last named groove is truly semi-circular in cross section and its function
is to perfect the shape and surface of the tube after its reduction by the preparing
grooves. The leading groove is very nearly but not quite semi-circular in cross
section and prepares the tube for the finishing groove.
As the leading and finishing grooves can only properly perform their functions so
long as their size and shape remain practically unchanged while the preparing
grooves may undergo a considerable amount of change by wear without their
efficiency being materially diminished the leading and finishing grooves in the rolls
as ordinarily made become sooner worn to an extent which impairs their efficiency
than the preparing grooves and the returning of the rolls in consequence has to be
more frequently resorted to than would be necessary if the preparing leading and
finishing grooves needed re-turning at the same time.
The object of our invention is to remedy the defect referred to and consists in
duplicating any or all of the leading and finishing grooves. That is to say in
making according to our invention rolls for the manufacture of iron and steel tubes
we duplicate both the leading and finishing grooves in each roll of the pair and in
using the said rolls we generally pass the tube after reduction twice through the
leading groove and once through the finishing groove and when the first leading
groove and the first finishing groove are worn we employ the second leading groove
and the second finishing groove.
The accompanying drawing represents a portion of a pair of rolls made according to
our invention the said drawing showing some of the duplicate leading and finishing
grooves of the pair of rolls.
The upper and lower rolls are marked respectively a and a² in the drawing;
bb and c c are the duplicate series of leading and finishing grooves of progressively
diminishing diameter at the end of the series of ordinary reducing grooves; that is,
the leading grooves b b and finishing grooves c, c are arranged in pairs one pair
of leading grooves b b alternating with another pair of finishing grooves c c. It
will be seen by an examination of the drawing that the leading groove of each pair
in each roll is nearly semi-circular in cross section and the finishing groove of each
pair in each roll is truly semi-circular, the said leading grooves b, b preparing the tube
for the finishing grooves c c.
.
In using the rolls represented we generally pass the tube after its reduction by the
reducing grooves twice through the first leading groove b of each pair and once
through the first finishing groove c of each pair and when the first leading groove
and the first finishing groove of each pair are worn we pass the tubo through the
second leading groove of each pair and through the second finishing groove of each
pair as will be understood by an examination of the drawing.
Although we have represented a series of alternating pairs of or duplicate leading

page_text: and finishing grooves in the rolls yet more or fewer duplicate leading and finishing
grooves may be arranged in the rolls.
By this arrangement of the grooves the work usually thrown upon one leading
groove and one finishing groove is divided between two leading and two finishing
grooves and the time during which the roll retains its efficiency is doubled.
In rolls made according to our invention the preparing grooves and the leading and
finishing grooves wear uniformly and require re-turning at the same time.
Although we generally use duplicate leading and finishing grooves only at the end
of the series of reducing grooves yet duplicate leading and finishing grooves may be
introduced at any parts of the series of reducing grooves.
The mandril and appliances we employ are of the ordinary kind and the reheating
of the tube under operation is effected from time to time as in the ordinary method of
manufacture.
Having now particularly, described and ascertained the nature of our invention
and the manner in which the same is to be performed we declare that we claim
as our invention of "Improvements in rolls used for the manufacture of iron and
steel tubes :-
"
The use in a pair of rolls having a series of reducing grooves of progressively
diminishing diameter of the duplicate arrangement of the progressively diminishing
leading and finishing grooves of the said rolls herein before described and illustrated in
the accompanying drawing; that is to say, arranging a pair of leading grooves side by
side with a pair of finishing grooves whether the said pairs or duplicate arrangement
of the leading and finishing grooves be used at the end of the series of reducing
grooves or at other parts of the series of reducing grooves for the purpose and
substantially as described and illustrated.
Dated the 29th day of October 1890.
CHARLES FAULKNER.
WM. HY. LLOYD.