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Патент USA US2110378

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March 8, 1938.
w. R. HUME
2,110,378
MANUFACTURE OF PIPES AND THE LIKE FROM SHEET METAL
Filed May 26, 1934
5 Sheets-Sheet l
March 8, 1938.
W. R. HUME
2,110,378
MANUFACTURE OF PIPES AND THE LIKE FROM SHEET METAL
Filed May 26, 1934
s sheéts-sheet 2
March s', 193s.
w_ R, „UME
. 2,110,378>
MANUFACTURE OF PIPES AND THE LIKE FROM SHEET METAL
_Filed May 26, 1954
' 5 Sheets-Sheet 3
Patented Mar. 8, 1938
- 2,110,378g
UNITED `STATI-:s PAT-ENT .OFFICE ,
MANUFACTURE OF PIPES ANVI?)- THE LIKE
FROM SHEET METALWaiter Reginald Hume, Melbourne,- victoria,
Australia, assignor to Hume Steel Limited,
Melbourne, Victoria, Australia
’
Application May 26, 1934, Serial No.~ 727,812 . In Australia June 15, 1933
-
6 Claims.
(ci. 153-54)
This invention relates to the manufacture of
lsheet» metal pipes and like hollow bodies wherein
flat metal plate is caused to travel lengthwise
between successive sets of shaping rollers which
5 progressively bend the plate from its longitudinal
edges towards its center so that the plate con
verges from the flat at one end into tubular
form at the other end.
'
,
central zone of the plate remains fiat and unsub
jected to pressure as aforesaid tends to keep the
work perfectly straight during bending opera- v
tions so _that a substantially perfectly straight
tube results.
'
c
The invention'also provides apparatus for car
rying the method intoeiïect and comprising sets
of shaping rollers between which the plate is
In` prior proposals of this kind, some or all of caused to pass, arranged 'at intervals in the di
the
sets of shaping rollers consist of an upper rection of travel of the plate, some of the rollers 10
10
roller and a lower roller, both rotatable about _of each set being located at one side and the
other rollers at the opposite side of the longi
horizontal axes and extending across the longi
tudinal center line of the plate, the respective tudinal center line ofthe plate, each set of roll
rollers having complementary convex-concave ers comprising two lower or outside rollers adapt
ed to rotate about vertical axes and havingv pe 15
15 peripheral faces which engage the upper and
lower surfaces of the plate. Owing to the rollers ripheries of concave curvature conforming, to
extending across the center line of the plate the external curvature of the pipe to be formed,
as aforesaid, the longitudinally extending central . and >two cooperating upper or inside rollers
adapted. to rotate about a transverse axis and
zone of the plate is, from the time the plate en
ters 'between the first rollers until it assumes or having peripheries of convex curvature conform
ing to th'e internal curvature of th'e pipe to be
approaches the desired tubular condition, con
tinuously subject to bending or to pressure by the formed,` each succeeding set of rollers being dis
various pairs of rollers. This bending or pres _ posed nearer to the longitudinal center line of
the plate than the preceding set so that the plate
sure, which is additional to the bending or pres
is progressively bent from its longitudinalV edges 25
sure
that
is
actually
necessary
for
-imparting
the
5
towards the center thereof into tubular form.
desired finished curvature to the plate, consid
According to a preferred mode of carrying out
erably increases friction between the plate and
rollers as well as Wear on the rollers and may re
sult in the central longitudinal zone of the plate,
30 while fiat, being compressed- to an extent suffi
cient to disaffect the subsequent bending of the
central zone or causevthe finished pipe to lose its
true circular section or cylindrical shape.
The present invention provides an improved
the method, a plate in a substantially flat con
dition is fed to and lcaused to’tra'vel longitudi
nally between sets of shaping rollers arranged l
at intervals in the direction of travel of the plate,
some ofthe rollers of each set being located at
one side, and the kother rollers atA the opposite
side, of the longitudinal centre line of the plate.
The ñrst group or set- of shaping rollers'act upon
52.» method of manufacturing sheet meta-1 pipes >and,
like hollow bodies according to which a plate the longitudinal edgeportions of the plate to
while moving lengthwise is subjected at each side bend these portions arcuately in conformity with
of its longitudinal center line, but not at or across the curvature of the finished pipe or like body. .
such center line, to pressure between sets of shap - Each succeeding .set of rollers is disposed nearer
ing rollers whereby portions of the plate at op-- to the longitudinal centre line of the plate than
posite sides of the 'center line are progressively the preceding series of rollers and act upon the
platel in a similar manner so that its longitudinal
bent towards each other in arcuate form until
the longitudinal edges thereof meet, the radii edge portions are gradually or progressively bent
of all of the bends being the same as the radius
43 of the pipe to be formed, so that subsequent
bending actions merely extend or continue the
curvature of previously curved portions without
subjecting said portions to further bending or
pressing actions, while a flat longitudinally ex
tending central portion of the plate of generally
isosceles triangular shape which> gradually di
minishes in area as bending operations proceed
remains unsubjected to pressure or bending until
the apex or leading‘end thereof is adjacent thefl- '
55 nal set of rollers. The fact that the longitudinal
>into senil-circular form and their longitudinal
edges abutted ready for welding together. The
plate isfed forwardly by the shaping rollers.
vThe vinvention permits of the economic pro
duction of pipes which are practically perfectly
straight and cylindrical and of relatively great
length devoid of circumferential joints.
' 50
' The invention also involves apparatus for car
rying out the' manufacture of pipes by the'im
proved method.
`
-
Referring to the drawings which form part of
this specification-
»
’
1 9,110,373
with the longitudinal centre lille- of the plate 2.
>'I‘he periphery of each horizontally rotating out-
Figure 1 is a side elevation of a machine~ ac
cording to one embodiment of the invention'.
F‘igure2illaplanofF'lgure1.»V
„
,
,
F'igure 3 is an end elevation looking onvr the
left hand end of Figure 1.
.
.
'
to the externalcurvature of the pipe to be
n
Figure 4 isa perspective view illustrating the Figure 5 is a fragmentary end view on an en
larged scale of one of a set of shaping rollers,
and associated parts of the machine.
_
Figure 6 is a part sectional view taken on line
l
Y
’ `
2. i. the longitudinal edge portions of the leading
Figure 7 is a fragmentary end view of .a further
set ot shaping rollers and aœociated parts.` „ 1
r F‘lgure 8 is aside elevation of the ?nal twoscts
of shaping rollers and associated parts.
'
¿ ,
,
formed. „Cooperating with the pair of rollers I
is a pair of ,upper or inside rollersl i mounted
Vupon a transverse spindle 1. ’ille periphery of
each roller l is of convex curvature conforming
to the internal curvature oi the pipe Vto be"
formed. Thus. Aas the plate 2 is entered and
passed-‘between the cooperating pairs of rollers
manner of bending the plate into tubularform.
VI-VI'of Figure 5.
side roller I is of concave curvature and of ap
proximately quarter-circular profile, conforming
end ofthe plate are initially bent into the de
siredcurvedform, theradius of thebends being
ythesameastheraciiusoilthepipetolle iormed
p
while'theV centralportion of the plate
Figure 9 is an end view oi the sets of rollers
É.
and associated parts seen in the left hand portion
side of Figure 8.
‘
'I‘he rollers of sets
f
vie'w` of thennal set'of " substantially identical with those of seta
seen in _the right are indicated ’by like numerals. The rollers R
'eachfsuccessive set are, however. arranged closer
handportionoi’Flg'ureß.
1l is a detail view
, Y partlyin 'section
to the longitudinal centre line lof 'the apparatus
showings bar and a backing member whichfex-Í as will be seen in Figure 2 so that'thefplate will
tend within theshaped metal sheet adiacent the >be gradually( shapedinto cylindrical form while
passing www!! the sets of rollers. ' e , 'l `
iinal shaping rollers in order toV assist the weld
The vertical spindles l of the various' outside
ing. ot
>abutted longitudinal edges of the
Figure 10 is
,rollers-and
rollers and the transverse-spindles 1 ot the Vilp
_ Figure 12 is anv end view looking on >the right
so
hand end of Figure 1l.
'
-
`
‘
per or inside rollers I may be supported by bear
ing brackets l secured toy a framework La’l‘he
13 is an' enlarged plan view of a -lower` , outside rollers may'be driven from a main shaft
portionoi the `backing' member seen in Figures
1iA and 12 showing arrangements for the water
Il'through'spur gearing I2,V a> countershaft Il.y
bevel gearing |74, transverse shafts il, worms il
14 is a vertical cross section taken
A and Bvmay be positively driven as by being
and worniwheels Il. ‘l 'I‘he inside rollers »l of sets '
. bevel geared as Vat izto the respective side rollers
through the 'centre'of the backing member.
morder tumore readily explain the method. „3, but such inside‘rollers as well «as those of„sets
reference is made to Figure 4 which depicts a , QC, D, Eand F may, Vif desired, be devoid of posi
>plate 2 in an intermediate stage of the bending> tive drivingmeans and rotate `merely by friction
,
i
n»
40
operations. It willbe seen therefrom that the wlththe plate.»V ` 'H
trailing end luis in its original ilat condition,
while the opposed longitudinal edge portions 2b
, The wormwheels I‘I may be made fast to the
respective outside rollers I. as by means of pegs
are progressively bentin curved formation, the I8 extending within co-aligned apertured bosses
radii of thebends being'uniform andv equal to I0 o'f the wormwheels ligand rollers). as seen
the radius- of the pipe to be formed, while the ' in'Figures 5'and 6 whichmay be assumed to illus
extent of the bends' increases towards the lead-ing end 2c which, at the stage indicated, is
shaped ¿into cylindrical form. It will valso be
noted that the central portion of the plate re
fiat until the plate'l‘has as'
sumedf the'desired cylindrical form. .Buch iisltV
portion will be of Vgenerally isosceles triangular
vshape having the trailing edge 2a as its >base
- . and its sides, indicated by> the references 2d, de
55 iinedwby lines from which the longitudinal edge
trate'the-E‘set'ofrollers. It will also be seen.
from these' two figures vthat the transverse shafts
, Ii'are supported by 'bearing`brackets “attached
Ato. the brackets l `before referred to. - „
, a
`
According toF'Agure 7, which illustrates the
set of rollersfthe vtwo inside rollers l are canted
or tilted upwardly .towardsfeach other.«the shaft
1» having opposltely-inclined portions 'la for the `
respective
rollers.
~
4
,
`The rrollers;- of set Gv (see the left hand’part
portions 2b commence to curve upwardly from ` of Flgure'ß >and‘F‘lgure 9) -comprise outside rolle..
theV iiat'portion by the action of the successive ers la and inside rollers ïla- similar to those oi
sets of rollers. ,The approximately triangular the preceding set but..as at this stage'the platel
,iiat'portion will gradually diminish in area asthe `is closely approaching the ydesired cylindrical
so bending operations proceed and will disappear form, the inside rollers are of comparatively CZ)
just prior to the entire plate arriving at a tubular small diameter to avoid them-fouling the upper
condition.
’
`
'
parts of the curved plate.
For similar» reasons.
' Referringìnow 'more particularly to Figures 1, e the inside rollers are mounted upona compara
tively short `shaft 22:.fsupported by a hanger 2l ,
depending from an overhead frame member 2l;~
The rollers of set H (i. e. thefinal set asseen
ing denoted `generally in Figure 1 by the referf "
ence characters A, B,'C,`D, E, F, G, H. The plate in the rightv hand part of Figure 8 and in Figure
V2 to be
in the direction from the 10). comprise two laterally-spaced outside rollers ‘
“A” set of rollers to the "H”-set so that it is 3b having concave peripheries `oi’ substantially'.
by‘each` succeeding set semi-circular proiile, the upper and'lower rims 3c
70 'progressively
of -the two rollers' contacting with, orbeing in
of rollers.
_.
The' rollers of set “A" comprise two lower .or close> proximity to, eachother in alignment withk
'2 and 3. the'apparatus is shown as including
reight sets of'shaping rollers,l the various sets bej
outside rollers 3 rotating about vertical spindles 'the longitudinal centre line of the apparatus, thus
l
at opposite sides of the longitudinal
75 centrer line _0f the 3pm ¿Whlch‘is coincident
defining a substantially circular passage or ori
nce' 2l (Figure 12) conforming to the external
3
2,110,378
contour of the pipe to be formed. The co-op
erating inside rollers 6b are'located within the
confines of this passage Vor orifice and are of rela
tively small diameter and may be canted or tilted
upwardly away from each other as seen in Fig-_
ures 1'0 and 12. These rollers may be supported by
an extension 23a of the hanger 23 which sup
ports the rollers 6a ofset G. The hanger and
10
frame may be reinforced by stays 25 (Figure 8).
The aforesaid orifice or passage furnished by
the rollers 3b of set H is preferably not trulylcir
cular but of slightly greater diameter measured
horizontally than vertically so that the plate 2 in
passing between the rollers is slightly elliptical.
A15 As soon as >the plate passes the two rollers, how
ever, the resilience of the plate causes it to as
sume a substantially truly cylindrical form as
small diameter pipes, say up- to six or eight inches
in diameter, there is a possibility that, owing to
shrinkage or contraction taking place during the
cooling of the welded joint, the resultant pipe
may lose its desirable straightness and become
slightly curved, in a longitudinal direction, the
curvature beingv concave along the line of the
weld. To _counteract any such tendency, the bed
of the machine may be “roached” or alterna
tively, the sets of rollers commencing from set 10
B may be successively arranged at a slightly low
er level than each -preceding set of rollers, so I
that the >plate is fed forwardly at a slight down
-ward inclination or curvature which isv corrected
or compensated for by shrinkage or contraction
-which occurs during the cooling of _the weld. _
In sorne instanceavit may be preferable to iso
' late or separate the final set of rollers H from the
' indicated in Figure 12.
The vertical spindles 4a of the outside rollers btherset of rollers so that the plate may be first
20 da, 3b may be supported by bearing brackets 8a shaped into partially cylindrical formby sets A
to G, then removed and passed through the set
secured to the framework 3 and driving connec
tions similar> to those referred to in connection H which may, with the appropriate welding plant,
with the preceding set of rollers may extend from. form la. separate unit.
'I_‘o permit ofthe production of pipes of differ
countershaft I3 to worm wheels l1 associated
'ent diameters, the brackets 8, 8a supporting the
with the outside rollers.
'
vIt will be evident from the foregoing that, as spindles of rollers 3, 3a, 3b and 6, 6a,"6b may be
the trailing end of the plate is entering between adjustable in a lateral direction upon the frame
and being acted upon by the rollers of set A, 9. Alternatively, the‘brackets may be mounted
the forward or leading end portion of 'the platel upon longitudinallyextending beams or frame
has assumed a substantially cylindrical form. ,members which may be swung or adjusted to 30
Thus, the plate converges from the flat at one wards and from each other so that the lateral
spacing of the rollers may- bevaried to suit vthe
I end to a tubular form at the other end with the
side edges curved upwardly to a progressively diameter of the pipes .to be formed. The rollers
greater extent from the flat to the tubular end. may be _readily removed from their spindles and
This procedure and formation which results in replaced by -other rollers lhaving peripheries of
the central portion of the plate remaining fiat the requisite contour.
'
until the plate assumes cylindrical -form en
sures that the pipe will be practically perfectly
straight from end to end.
In order to prevent any possibility of the cen
tral flat portion of the plate sagging due to roller
pressure duringv the bending process,v a bearer IIJ
may extend lengthwise beneath the centre por
tion of the plate so as to contact with the un
45 der surface thereof as in Figures 5,- 7, 9 and 10.
The longitudinal meeting edges of the- plate
Having now described my invention, what `I
claim as new and desire to secure by Letters
Patent is:---
„
r
l
1. Apparatus for manufacturing pipes and like 40
hollow bodies from flat metal plate; comprising
sets of shaping rollers, between which the plate
is caused to pass, arranged lat intervals in the
direction of .travel ofthe plate, some of the rollers
of eachset vbeing located at one side and the 45
other rollers at the opposite side of the- longi
2 may be progressively welded together soon after tudinal centre line‘of the plate, each succeeding
set of rollers being disposed nearer to theflongi
they emerge from the orifice or passage 26 pro
vided by rollers -3b. In order to assist effective tudinal centre line of the plate than the preced
ing set so that the plate is progressively bent 50
50 welding, a backing member 26 may be arranged
to bear upwardly against the internal surface from its longitudinal edges towards the centre
of the now cylindrical plate in vertical alignment „thereof into tubular form, the final set of rollers
with the- welding electrode 21. The backing ~cömprising two outside rollers adapted to rotate
about vertical axes and having peripheries ofv con
cave semi-circular profile defining'between them 55
an orifice conforming substantially to the external
circular form of the pipe to be produced, and two
co-operating inside rollers disposed within said
member, which may be of copper in order to
55 exercise a desirable chilling effect upon the line
of weld, may have a depending stem 28 engaged
at its lower end by a spring 29 anchored to an
upper bar 30 attached at its front end to the rear
of the hanger 23. A lower bar 3| may also be
60 attached at'its front end to the _hanger and se
cured at its rear end to the upper bar by straps
32. 'I'he backing member may be provided at its
front with an anti-wearing piece such as a _steel
nose 33.
jos
»
Provision may be made for cooling the back
ing member by suitable fluid. For example, the
backing member and a separable base 34- therefor
may be provided in their contiguous faces with
grooves 35, 36 defining a passage 31 for'water or
70 the like which may be circulated through the
passage‘from a supply pipe 38 to av discharge
pipe 39. A gasket 40 may extend between the
backing member and its base to prevent leak
age of'fiuid from the passage.
75
In the case of manufacturing comparatively
orifice or passage on opposite sides of the longi
tudinal center line of the plate and adapted to ro
tate about different axes which extend trans
60
versely relatively to the path of travel of the
plate, the peripheries of the inside rollers being
of convex curvature conforming to the internal
curvature of the pipe to be formed.`-
-
65
2. Apparatus according to claim 1’; in which
the diameter of the orifice or passage defined by
said loutside rollers of the final set of rollers is
slightly greater measured in one direction than
in a direction at right angles thereto so that the 70
plate may assume a slightly elliptical form in
passing between said rollers and after emerging
therefrom may automatically assume a substan
tially true circular form.
3. lApparatus for manufacturing pipes and like
2,110,878
hollow bodies from ?at metal plate, comprising
sets of shaping rollers between. which the plate
like
5. An
hollow
apparatus
bodies forI
frommanufacturing
ilatl metal plate,
pipescom
is caused to pass, arrangedat intervals in the . prising a plurality of spaced sets of shaping rollers
arranged at intervals ‘in the direction of travel
direction oftravel of the plate, some of the roll
ers of each setbeing located at one side and the ' oi' the plate and through which the'plate is pro
other rollers at the opposite side of the longi-> gressively caused to pass,- the first set oi' rollers
oenter line of theplate, _each set of rollers through which said plate is passed having pairs
4comprising two lower or outside rollers adaptedY ¿of rollers -positioned 4to engage portionsfofthe
to rotate about vertical axes and having periph vplate adjacent the side edges thereof and bend
Y veries'off. concave curvature conforming to the ei:
the edges toward each other to form a bend Vin
ternaljcur'vatu?e of the pipe to be formed, and saidportions having va.' radim of curvature equal>
two' cooperating upper or inside rollers mounted to the radius of the pipe _to be formed. while leav
ingA thecentral portion of the plate dat, each sue
cessive set of rollers through'which the plate is
passed having pairs of'rollers positioned to en
gage yfiat portions _of the plate,lmmedlatclyïad-`
of convex curvature conforming to the internal. jacent the bent portions formed by the set o!
rollers from‘which the plate has Just
'
curvature of the pipe to be formed, each fsuc
ceeding set of rollers being disposed nearer'to bend the side edgesof the plate closer together
yon oppositesides of the longitudinal centerline
of the plate and adapted to rotate aboutdiiierent
axes which ~extend transversely relatively to the
path of travel of ther‘ate and ~having peripheries
the longitudinal center line of the plate than the
' preceding yset so'that the' plate is progressively
bent from its longitudinal edges Ítowards the
center thereof into tubular form.
'
4'. An apparatus for manufacturing pipes and
like hollow bodies from fiat metal plate, compris
to form in said last-mentionedflat portions a 20
bend'adjacent to and continuous with the pre
viously formed bend and having the same radius
of curvature, whereby the. iiat portions 'of the
plate on opposite sides of the longitudinal» center . ,
line are progressivelyfbent toward each other in
arcuate form until the longitudinal‘sideodges
arranged at intervals in the direction of‘travel of ‘ meet without bending' the previously-bent por-.
tions, eachv succeeding aet'ot rollers being ar
the plate and through which the plate is progres
sively caused -to pass. the first set of rollers ranged at a slightly lower level for imparting a
downward Icurvature to 'the tube being formed 30
30 through which-said plate is passed having pairs
of rollers positioned to engage portions of the to compensate iofr warpage due to shrinkage upon
plate' adjacent the side'edges thereof and bend vwelding the side edges »of the bent’plate together
the edges toward each other to forma bend in y kto complete the tube, the iinal-’set of rollers com
said portions'having a radius o! curvature equal prising two outside. rollers adapted' to rotate
to the radius of the pipe to be formed, whileleav - labout vertical axes and'havlng peripheries of con 85
ing the -central portion of the lplate ilat, each cave semi-circular pronle defining between them
successive set of rollers through which the plate an oriñce conforming substantially to the ex- `
ternal circular form of the pipe to be produced
is passed having pairs of rollers positioned to en
gage ilat portions of the plate immediately and each set of rollers including two cooperating
‘ adjacent the bent‘portions formed by the set of inside rollers mounted on opposite sides ofthe
‘ rollers from which the plate has just passed and longitudinal center line'of a plate fed through
bend the side edges oi.'- the plate closer'together the apparatus for rotation about axes which ex
tend transversely relatively to the path of travel
` 4to form in said last-mentioned ilat portions a
oi the Vplate within said oriilce and having periph
bend adjacent to and continuous with the previ
ously-formed bend and having the same radius --eries conforming to the internal curvature `of the
-fing- a plurality of spaced sets of shaping rollers
,
'
of"cur_vature, whereby the flat portions'of the pipe to be formed.
plateon opposite sides ofthe longitudinal center Y , v 6. In a roller bending apparatus for producing
line are progressively bent toward each other in
arcuate‘torm until the longitudinal side edges
»meet without bending the previously-bent por-_
tions, the ñnal set of rollers comprising two
outside rollers adapted to rotate about vertical
'pipes' and. like hollow bodies from hat metal
plates, a' set of shaping rollers comprising
outside rollers adapted to Vrotate about vertical>
axes and having peripheries of concave, approxi
vaxes and having peripheries ofl concave semi-cir-V
them an Vorifice having a diameter y somewhat
cular profile defining between them an oriñce
conforming substantially to the external circular
form of the pipe to be produced, and Aeach set vof
greater‘measured in one direction than in a direc
tion lat a right angle thereto, and two cooperating` 55
inside rollers mounted on opposite sides of the
rollers including two cooperating inside rollers
longitudinal center line of a plate fed through the
mately semi-circular, profile denning between
apparatus for rotation about difl'erent axes which
ter line' of a plate fed through the apparatus for extend transversely relatively` to the path of
rotation about axes which extend transversely ' travel of said plate within said orifice and having 60
peripheries conforming to the internal curvature ‘
relatively to the path of travel of the vplate with
o
l
in said oriilce and having peripheries conforming of the pipe to be formed.
’mounted on opposite sides of the longitudinal cen
on
so
to the internal curvature of the pipe to be formed. .
_
n
w. R Hmm.
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