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Патент USA US2124880

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July 26, 1938.
2,124,88O
E. B. HUDSON
REVERSIBLE ROLLING UNDER CONTROLLED TENSION
Original Filed-Oct. 23, 1934
5 Sheets-Sheet l
INVENTOR.‘
Emu/N13 Hausa/v.
BY
-
M10 # w
ATTORNEYS,
July 26, 1938'.
2,124,880
E. B. HUDSON
REVERSIBLE ROLLING UNDER CONTROLLED TENSION
Original Filed Oct. 23, 1934
5 Sheets-Sheet 2
N
‘
INVENTOR.
?aw/MB. Hausa/v.
ATTORNEYS.
July 26, 1938.
E. B. HUDSQN
.
2,124,8G
REVERSIBLE ROLLING UNDER CONTROLLED TENSION
Original Filed Oct. 23, 1954
5 Sheets-Sheet 3
“N
ATTORNEYS.
July 26, 1938.
2,124,880
E. B. HUDSON
REVERSIBLE ROLLING UNDER CONTROLLED TENSION
Original Filed Oct. 25, 1934
.5 Sheets-Sheet 4
INVENTOR.
[aw/1v 5. Hausa/v
ATTORNEY$_
July 26, 1938.
E. B'. HUDSON
2,124,880
REVERSIBLE ROLLING UNDER CONTROLLED TENSION
Original Filed Oct. 23, 1934
5 Sheets-Sheet 5
630
EL.
INVENTOR.
EDMNB. Hausa/v.
ATTORNEYS_
2,124,880
Patented July 26, 1938
UNITED STATES
PATENT OFFICE
2,124,880
‘
‘
REVERSIBLE ROLLING UNDER CON
TROLLED TENSION
/
Edwin B. Hudson, Middletown, Ohio, assignor to ,
The American Rolling Mill Company, Middle
town, Ohio, a corporation of Ohio
Original application October 23, 1934, Serial No.
749,591‘. Divided and this application October
23, 1934, Serial No. 749,592
6 Claims. (01. 80—32) '
‘My. invention is addressed to the rolling of conditions. An attempt to control the speeds of
metal under tension, and will ?nd its greatest the various dynamic instrumentalities in the sys
utility in the rolling of long strips of metal back
tem in accordance with tension variations in the
strip, does not wholly succeed became, once there
wardly and forwardly in a reversible mill or mill
' 5
combination. For the purpose of disclosing my
invention in a clear and readily appreciable man
ner, I shall describe it in a particular embodi
ment, it being understood that this embodiment
is exemplary only, and that my inventionis not
10 limited otherwise than as set forth in the ap
pended claims. -A method of tension rolling
the rolled piece has been produced. Moreover
it is not desired to place any great quantity of
apparatus between the mill and the coilers be
cause this increases the length of unrollable strip
between the mill and the ultimate attachment 10
of the strip to the coiler drums. Since some of
whereby end wastage is eliminated, which is
the variations may be cumulative, control of the
described and claimed in a copending applica
speeds of the several dynamic instrumentalities
is desirable; but because no speed control has
rapid enough response to take care of the spo 15
radic tension variations, it is necessary to pro;
vide some means which will keep the tension
constant and unvarying in spite of the factors
tending to produce tension change, and then to
control speeds in accordance with variations of
elongation. This implies means to take up at
least a short length‘of strip under a constant
force. Finally, there is ordinarily desired in ten
tion, Ser. No. 724,931, ?led May 10, 1934, and
-15 entitled Apparatus and process for tensioned cold
rolling in reversible mills, may be employed if
desired with the apparatus and method of this
invention, with such appropriate apparatus ad
ditions as will be understood from a reading of.
20 the said copending case.
This'is a division of my co-pending application
Ser. No'. 749,591, ?led October 23, 1934, and en
titled Tension apparatus for reversible mills.
It has hitherto been suggested to roll metal of
25 strip length and sheet width backwardly and for
.wardly through a mill, say, of the four-high type
with small working rolls capable of making a
heavy vreduction per pass. On either side of the
mill an apparatus in the nature of a tight coiler
is placed. The coiler ahead of the mill, when the
strip is moving in one direction, is driven to exert
the desired forward tension on the piece, while
the coiler behind the mill is braked to exert the
35
has been a variation in the tension a variation in
desired back tension.
Each coiler is arranged to act alternately as a
braking or ~pulling device as the direction of roll
ing is changed.
7
It will be clear that a system of- this kind
presents certain problems, some of which will
40 be set forth. In the coiling devices, Whether used
as pullers or as brakes, for a given force applied
to the shafts of the drums, theforce applied to
the strip will vary inversely to the diameter of
the coils on the drums, as will be obvious. The
most perfect rolling under tension is dependent
upon continuously uniform and unvarying ten’
sion, since with a given setting of the rolls a
difference in gauge will follow a difference in
tension. Even if provision were made in some
50 way that the pulling and braking coilers could
exert a, constant force upon the strip, yet one
would be confronted with those continual and
‘sporadic variations in elongation which arise
. from non-uniformity of gauge, strain or hardness
55 in the piece being rolled, and from other rolling
sion rolling a positive tension di?erential, i. e. a
greater tension in the strip on the outgoing side 25
of the mill than on the incoming side. Since the
mill is a reversible mill, this condition must like
wise be made reversible.
The solution of these problems constitute the
major object of my invention, together with the 30
provision of a‘ relatively simple and compact ap
paratus easily kept in repair. The ancillary ob
jects of my invention will be understood by one
skilled in the art upon reading these speci?ca
tions, wherein I shall describe the aforesaid ex 35
emplary embodiment. Reference is now made to
the drawings wherein:
Figure 1 is a vertical sectional view of my ap
paratus with parts removed for the sake of clear
40
ness.
Fig. 2 is an elevational view of an adjustable
accumulator
device.
‘
.
Fig. 3 is a plan view of the mill, one of the
coilers, and the drives therefor.
Fig. 4 is an end elevation thereof.v
45
Fig. 5 is a side elevation of a coiler and its
mountings.
Fig. 6 is an end elevation thereof.
Fig. 7 is a plan view of my accumulator.
Fig. 8 is an end elevation thereof.
~ Fig. 9 is an elevational view of an exemplary
braking ‘apparatus.
' '
Brie?y, .in the practice of my invention I pro
vide a reversible mill I (reference is made to
Figs. 1 and 2 for a better understanding of this 56
2,124,880
2
brief description). This mill is preferably of the ?uid is desired. A gauge 36 may be calibrated
four-high type. Guide rolls 2 and 3 are shown to read in pressure or in strip tension. It will
adjacent the mill. On either side of the mill _ be understood that the ?uid pressure produced
by this type of accumulator may be readily varied
there is a coiler, the drums of which are indi
cated at 3 and 4. These drums, instead of being by tilting the cylinder 25 on its trunnions. The UK
mounted in the ordinary frames, are held in pressure will be greatest with the cylinder in,a
vertical position, vand will be scaled down to zero
crook-shaped cradles 4a and 5 which are pivoted
as the cylinder is turned in either direction
to the boiler frames 6 and 1 below the drums as
at 8 and 9.
through an angle of 90 degrees.
Thus, as the cradles tilt, the drums
chinery, and the tilting of them, may, by simple
and readily understandable means, be made auto
under constant forces. In this way I have pro
15 vided for a structure in which sporadic varia
tions in elongation may occur without affecting
tension, since these variations are taken up by
movements of the cradlesgand drums. The extent of movement of the drums is, of course,
matically'responsive to a reversal of the mill.
I shall now proceed to a more particular de
I
20 limited; so that it is advisable to control the
speeds of the various instrumentalities in accord
ance with variations in elongation. Each drum
will be understood to have a drive, such as an
electric motor. Rheostats for these motors re
25 spectively are shown at 12 and I3, each equipped
with sheaves l4 and 15. Cables l6 and I1, con
nected with arms on the respective cradles, pass
over these sheaves and are counterweighted as
at I8 and I9.
Thus variations in the positions
30 of the cradles will produce corresponding varia
tions in the drum drives, although a lost motion
connection may be made therebetween so that
there will be a central zone of no control. It
will be understood that the drums may likewise
35 be equippedv‘with braking means for main lieu
of a drive when any particular drum is paying
out strip.
'
The mill may be of any suitable type, equipped
or not with means for compensating for the
40 offsetting of the working rolls as the direction of
rolling changes. I have shown vat 20 a loading
device for the entrance cradle, and at 2| a re
ceiving device for the exit cradle. The exit
cradle is tiltable so that the drum 4 will run'out
45 onto the receiving device.
Accumulators
of this type form a facile means of adjusting the 10
forces acting on the take up means, speedily and
accurately. The cylinders may be tilted by ma
10 are brought closer to or further from the rolls
of the mill. Hydraulic or other ?uid pressure
cylinders l0 and H tend to. rock the cradles so
as to urge the drums away from the mill rolls
Overhead handling
equipment is indicated at 22 and 23.
It has been pointed out hereinabove-that in
most instances a positive differential in tension is
desired in the direction of rolling. If this were
not so, the cylinders I0 and II might continu
ously have equal fluid pressures imposed upon
them, and might conveniently be loaded from
the same accumulator. But if rolling is proceed
ing with movement of the strip 24 to the right
in Fig. 1, there will preferably be greater ?uid
pressure in the cylinder ll than in the cylinder
l0; and when the mill is reversed the reverse of
these conditions is desired. This may be accom
plished by providing a separate accumulator for
60 each of the cylinders, and effectively changing
the weights on the accumulators as required. I
have devised a simple apparatus for this purpose
which I have shown in Fig. 2. Here the accumu
lator comprises a cylinder 25 mounted on trun
nions 26 in a frame 21. A piston, is pivoted to a
connecting rod indicated at 28, pivoted in turn
to a yoke 29. Rods 30 and 3| are connected at
one end to this yoke, pass externally of the
cylinder and are guided thereon by rolls 32.
Weights 33 are connected to these rods. Con
nection to the cylinder may be made through a
trunnion, and I have indicated at 34 a line con
necting the cylinder 25 with a cylinder l l on one
of the cradles. A branch 35 of the line may lead
75 to a pump for oil, water, or whatever pressure
scription of an exemplary embodiment of the
various mechanisms which I employ. I have
shown in Figs. 3 and 4 the mill, one of the coilers,
and the drives therefor. A motor 31, for driving 20
the mill, is reversible or is equipped with a re
versible drive. It is directly connected, driving,
through a suitable coupling 39, a mill pinion
stand of known type. Splined shafts 4| connect
the pinions of the stand with the rolls Ia of the
mill.
A second motor 42 drives a gear box 44.
The
low speed shaft of this gear box is connected
through a universal coupling 46 and a splined
shaft 41 directly to the drum 3 of one of the
coilers. The high speed shaft of the pinion stand
is connected by a coupling 45 to the shaft 48 of
a braking device.
This shaft bears a drum 49
connected thereto by an over-running clutch
located within the drum. The over-running .'
clutch makes it unnecessary otherwise to con
nect and disconnect the brake. Cables 50 are
wound around the drum to react frictionally
therewith. The braking arrangement is more
clearly shown in Fig. 9, where 49 again indicates 40
the drum, and 50 the cables.
The cables are
dead-ended to a base as at 50a.
The base bears
a standard 51a, to which a scale beam 5| is
pivoted as at 5lb. The other end of the cables
50, which is in the form of a loop, is passed over
a sheave 50b, mounted upon the scale beam 55.
A reversible motor 52 is mounted upon the scale
beam, and bears a threaded shaft 52a extending
therealong. A weight 5lc is threaded on the
shaft 52a, and is arranged to move along the
scale beam when driven by the motor 52. It
will be clear that as the weight 510 (which has
provision for being additionally loaded as de
sired) is moved outwardly along the scale beam,
the tension on the cables 50 will be increased. 55
and the braking action, and therefore the back
tension on the piece being rolled, will likewise
be increased.
The motor 52 may be controlled by hand if
desired, but it is more convenient to do this au 60
tomatically to control the braking action in such
a way that the back tension may be maintained
uniform. Since at the time of rolling in the one,
direction that coiler which is braked will not be
positively driven by its corresponding driven 65
motor, such a control amounts to a control of a
dynamic instrumentality in the "assembly, and
may be affected by similar means. It is conven
ient to attach a switch to the corresponding
cradle, say, cradle 4a in Fig. 1, so that when this 70
cradle has rocked a predetermined distance in a
counter-clockwise direction the motor 52 will be
started up and driven forwardly so as to move
the weight 51c outwardly along the scale beam
until the said motion of the cradle has been ar
76
3
2,124,880
In order to give to the roller vin a place ready
rested. Likewise when the cradle moves a pre
determined distance in a clockwise direction, a
switch actuated thereby is effective to start'the
accessible to him a de?nite indication of for
ward and back tensions, I have shown indica
tors b and b’ on the frame of the mill 1. These
indicators are driven from the respective hy
motor 52 in a reverse direction so as to bring
the weight 5|c inwardly along the scale beam
until the motion of the cradle has stopped. With
the suggestion of the automatic operation of the
draulic accumulators in any way desired. Pref
erably they are calibrated to show tension in
convenient units. Actually they indicate the
angularity of the hydraulic accumulators, and
motor 52, the switching arrangement will be
clear to one skilled in the art.
The over-running clutch referred to, located
may be directly driven from the trunnions 26 of 10
the accumulators through ?exible shafts. I ?nd
within the drum 49 or in connection with the
shaft 48, renders the brake ineffective when the
it more convenient, however, to connect a selsyn
corresponding coiler drum is being positively
driven in a pulling direction by its motor. How
ever, during the threading operations of the ap
the coiler motor in a reverse direction, which “
indicates the advisability of the provision of some ‘
motor, indicated at C in Figures '7 and 8, with
the corresponding one of the indicators b or b’
in Figure 1, which is equipped with a selsyn 15
motor. The connections therefore become elec
tric rather than mechanical, and the indicators
give a de?nite indication of the position of the
means to relieve the braking action.
accumulators. They may then be calibrated in
paratus, it may sometimes be necessary to drive
To this end
20 I provide an ordinary thruster 52b, located under
the desired tension units.
,
20
It will be clear that my invention is not re
an endof the scale beam 5!. This thruster may
be of an ordinary type well known in the art, and
stricted to the particular embodiments of ap
special description thereof is not required. Its
paratus which I have described in some detail. '
My invention as claimed'may be practiced with
25 upwardly, thereby relieving tension on the cables - other apparatus; and modi?cations in my inven 25
50, and it may be, and preferably is, actuated by /tion may be made without departing from the
a hand control, since relief of the braking action spirit thereof.
' will be required only during threading operations.
Having thus described my invention, what I
The cradle 40. is ‘shown as comprising side claim as new and desire to secure by Letters
Patent, is:
30
30 pieces 4b and'transverse members 53 and 54.
function is to push the free end of the scale beam
The cylinder ill has a plunger assembly Illa,
terminating in a yoke I 0b. This yoke is con
nected by rods Me to the cross piece 53. Below
the cylinder assembly a stop means 55 may be
35 provided, which may be resilient or not as de
‘
1. In combination, a mill, coilers on each side
.of said mill, said coilers having drums and said
drums being movable toward or away from said
mill, drivers and braking means for each of said
drums and means for urging said drums away 85
sired.
Further details of the coiling devices are
shown in Figs. 5 and 6, where it will be seen
that the drum 3 has bearing members 56 and
from said mill under predetermined forces, and
means for varying said forces inversely to each
40 51, which are in the form of sheaves or rollers
of said mill, said coilers having drums and said
drums being movable toward or‘ away from said
mill, drivers and braking means for each of said
drums and means for urging said dmms away
permitting motion of the drum along the cradle
other as the direction of rolling is changed. '
2. In combination, a vmill, coilers on each side
members 4b when it is desired to remove the
drum for loading or rewinding purposes. Suit
able anti-friction bearing means are located be ' from said mill under predetermined forces,
means for varying said forces inversely to each 45
45 tween the sheave members and the shafts of
the drum. The splined shaft 41 from the drive other as the direction of rolling is changed, said
urging means comprising ?uid cylinders and said
is connected to the drum shaft by a slidable con
necting member 58. To connect and disconnect variable means comprising adjustable accumu
the drum from the shaft 47, I provide a power lators. '
'3. In combination, a mill, coilers on each side
50 means to operate the slidable connecting mem
ber. ' This comprises a pressure cylinder 59, arms
of said mill, said coilers having drums and said
50 connected to the piston thereof and also to
drums being movable toward or away from said
mill, drivers and braking means for eachof said
drums and means for urging said drums away
the connecting member 58. The arms are
?nally connected to the frame of the coiler by a
55 linkage 6| forming a moving fulcrum therefor.
Latch means 62 may be provided to prevent ac‘
from said mill under predetermined forces,
means for varying said‘ forces inversely to each
other as the direction of rolling is changed, said
crook of the coiler.
_ urging means comprising '?uid cylinders and
said variable means comprising adjustable ac
An exemplary form of my variable accumula
cumulators, each of said accumulators com
60 tor is shown in Figs. '7 and 8. 63 represents the
frame of the apparatus. The cylinder is again prising a cylinder, a piston, and weight means
shown at 25 and the trunnions at 26. Segmental exerting force on said piston, said cylinder being
tiltable to vary said force.
gear wheels 64 on the trunnions mesh with pin
ions 65 on a shaft 66 iournaled in frame exten
4. In combination, a mill,_coi1ers on each side
65 sions 63a. The shaft bears a gear 6'! which is of said mill, said coilers having drums and said
connected by a change speed gearing arrange
drums being movable toward or away from said
ment indicated generally at 68 to a motor 69.
mill, drivers and braking means for each of said
The yoke is again indicated at 29 and the , drums and means for urging‘ said drums away
external rods at 30 and 3|. In this particular from said mill under predetermined forces,
70 embodiment, ears ‘l0 and ‘II on the cylinder 25 means for varying said forces inversely to each
bear wheels ‘I2 which serve as guides for the other as the direction of rolling is changed, and
rods. The weights 33 are attached to the ends indexing means on said varying means to facili
of the rods which are connected by a yoke 14. tate rapid settings thereof to predetermined
Spring cushioning means ‘I3 are shown in the forces.
cidental dislodgement of the drum from the
75 upper yoke.
5; In combination, a reversible mill for rolling
4
2,124,880
strip metal forwardly and backwardly, means
on each side of said mill for exerting unequal
tensioning forces on ‘said strip as it enters and
as it leaves said mill, means for inversely varying
the forces exerted by said last mentioned means
as the direction of rolling is changed, whereby
desired relationships between the forward and
back tensions on the strip may be had in spite
of reversals of said mill, means on each side of
10 said mill for making the forward and back ten
sions independent of sporadic variations in elon
6. A processgof rolling strip under (tension
which comprises rolling strip metal forwardly
and backwardly in a reversible mill to reduce it
to gauge, while exerting tensioning forces on
said strip as it enters and. as it leaves said mill, 6
said forces being unequal whereby to establish
a desired differential ‘of tension realtive to the
mill pass, varying said forces inversely when the
direction of rolling is reversed, taking up spo
radic variations in elongation on each side of 10
said mill under forces which are unequal but
which are constant during the operation of the
gation produced by the mill so as to maintain
said tensions constant during the operation of - mill in any given direction, whereby the ten
said mill '_in any given direction, said means sions on the strip are rendered independent of
15 operativeto take up under constant forces said said sporadic variations, and varying said take 15
variations in elongation, and means for inverse
up forces inversely when the direction of rolling
ly varying the forces exerted by said last men
is changed.
tioned means as the direction of rolling is
changed.
'
EDWIN B. HUDSON.
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