HIGH-SPEED SHEARS FOR CUTTING ROLLED STRIP TO LENGTH

CISAILLLE ULTRA-RAPIDE POUR LE TRONCONNAGE D'UN FEUILLARD A CHAUD

English Abstract

Flying shears for thin hot strip are to be configured in such a way that
very fast running strip con be securely cut. For the purpose it is proposed
that one of the cutting tool drums of mounted on a rocker, that an
adjusting device consists of drives effecting the cutting movement and
support elements located between said drives and the rockers and that
the support elements are shortenable to an effective position effecting
a cut.

French Abstract

Une cisaille volante pour feuillard à chaud mince doit être configurée de manière à permettre le tronçonnage fiable d'un feuillard défilant très rapidement. A cet effet, l'un des tambours de l'outil tranchant est monté sur un levier oscillant, le dispositif de réglage est constitué de mécanismes moteurs effectuant le mouvement de tronçonnage et d'éléments de support disposés entre ces derniers et les leviers oscillants, et les éléments de support peuvent être raccourcis jusqu'à une position active provoquant le tronçonnage.

Claims

What is claimed is
1. ~Flying shears (1) with cutting tools (6, 7) located on respective first
and
second drums (2, 3) arranged facing each other, which tools are accelerable by
at least one driving device (8) associated therewith to a peripheral speed
corresponding to a speed of a strip (9) to be cut wherein the second drum (3)
is
mounted on rockers (4) associated with a separately controllable adjusting
device consisting of drives (12, 13) effecting the cutting movement and
support
elements (10) located between said drives and the rockers (4) and that the
support elements (10) are shortenable to an effective cutting position to
produce a cut.
2. ~Flying shears according to claim 1, wherein the support elements (10)
are lockable in the effective cutting position.
3. ~Flying shears according to claim 1 or claim 2, wherein a selected one of
the drives is configured as a crank (12).
4. ~Flying shears according to claim 1 or claim 2, wherein a selected one of
the drives is configured as a piston-cylinder unit (16).
5. ~Flying shears according to any one of claims 1 to 4, wherein a
synchronization (14, 14') is provided between the driving devices (8) and the
drives (12, 13).
6. ~Flying shears according to any one of claims 1 to 5, wherein the cutting
tools (6, 7) are configured as a chisel (6) located on a drum (2) and as a
jacket
area acting as an anvil (7) located on the second drum (3).
7. ~Flying shears according to any one of claims 1 to 6, wherein the support
elements (10) are positionable in their effective cutting position before the
beginning of the working stroke of the drives (12, 13).
7

8. ~Flying shears (1') with cutting tools (6', 7') located on drums (2', 3')
facing
each other, which tools are accelerable by at least one driving device (8')
associated therewith to a peripheral speed corresponding to a speed of the
strip
(9') to be cut and with a separately controllable adjusting device associated
with
a first one of said drums (2'), wherein the second other one of said drums
(3') is
mounted on rockers (4') which are supported by means of support elements
(10') which are shortenable to an effective cutting position to produce a cut,
the
adjusting device has cranks (12') which are connected with the first drum
(2'),
and said first drum is movable to produce the cut through paraxial
displacement towards the second drum (3').
9. ~Flying shears according to claim 8, wherein the support elements (10')
are lockable in the effective cutting position.
10. ~Flying shears according to claim 8 or claim 9, wherein a synchronization
is provided between the at least one driving device (8') and the cranks (12').
11. ~Flying shears according to any one of claims 8 to 10, wherein the cutting
tools (6', 7') are configured as a chisel (6') located on the first drum (2')
and as a
jacket area acting as an anvil (7') located on the second drum (3').
12. ~Flying shears according to any one of claims 8 to 11, wherein the
support elements (10') are positionable in effective cutting position before
the
beginning of the working stroke of the cranks (12').
13. ~Flying shears according to any one of claims 1 to 12, wherein the shears
(1, 1') are an integral part of a coiler (18-20).
8

Description

CA 02323356 2006-10-11
High-speed shears for cutting rolled strip to length
The invention relates to flying shears with cutting tools located on drums
facing each
other, which tools are accelerable by at least one driving device assigned to
them to a
peripheral speed corresponding to the speed of the strip to be cut and with
separately
controllable adjusting device assigned to one of the drums.
Similar shears have become known through DIE-OS 21 38 478. These shears are,
however, intended for the cutting of fast-running wire. For the cutting of
strips,
DE-OS 41 28 970 discloses linear guides for the drums, which guides are
located in
stands. In this case, blades are used, which require very exact
synchronization
between drum drive and adjusting drive in order to be able to execute a
correspondingly clean cut. Through this very e:Kact synchronization, such
shears are
relatively slow.
The invention is based on the object of further developing flying shears for
the cutting
of hot strip in such a way that good cutting resullrs are guaranteed even at
strip speeds
of up to 30 m/sec and with minimal strip thicknesses.
For the solving of this object it is proposed that one of the drums is mounted
on
rockers, that the adjusting device consists of drives effecting the cutting
movement
and support elements located between said drives and the rockers and that the
support elements are shortenable to an effective position effecting a cut. A
further
solution
1

CA 02323356 2006-10-11
proposal consists in that one of the drums is mounted on rockers, that the
rockers are
supported by means of support elements, that the support elements are
shortenable
to an effective position effecting a cut, that the adjusting device has cranks
which are
connected with the second drum, and said second drum is capable of leading to
the
cut through paraxial displacement towards the first drum.
Through this design of the shears it is achieved that the drums can always be
driven
at a peripheral speed corresponding to the speed of the strip to be cut or at
a
peripheral speed slightly lowered in comparison with said speed respectively.
Thereby the cutting tools can always execute the cutting movement without a
cut
being made. Only when a cut is to be executed are the support elements brought
into
effective postion. The next cutting movement of the cutting tools then leads
to the cut.
There is also the possibility to leave only the drums constantly at a
corresponding
peripheral speed and to drive the adjusting device only for a cut.
Alternatively the driving device for the drums can naturally also be brought
to a
standstill during the times in which no cut is to be made. In order to
accelerate these
drums for the cut, however, substantially greater motor outputs are required
than if the
drums were to run constantly at a corresponding peripheral speed.
It is of advantage if the support elements are lockable in their effective
length. By this
means it is achieved that a spring-back between the drums is limited to a
minimum so
that cuts as exact as possible can be made. 1I\lith corresponding dimensioning
of the
support elements, the power transmission can be effected directly by them,
i.e.
without corresponding locking.
Through the use of chisel and anvil as cutting i:ools, a very exact
synchronization, as
is required with cutting blades, is not necessary. Nonetheless, a
synchronization
between the driving devices and the drives or cranks respectively is
appropriate,
whereby, however, slight
2

CA 02323356 2006-07-19
slips can be compensated through the fact that larger jacket areas act as an
anvil.
It is advisable to bring the support elements into their effective position
before the
beginning of the working stroke of the drives or cranks respectively. By this
means it
is guaranteed that the support elements are already in effective position
during the cut
and irregularities cannot occur through adjustments of the support elements
during the
cut.
In the case of the very thin hot strips to be cut here, it has been shown that
the strip
starts are very difficult to guide after a cut. It is therefore of great
importance to
integrate the cutting devices into a corresponding coiler or to place said
cutting
devices at a minimum distance in front of the coiler respectively.
In one aspect, the present invention resides in flying shears with cutting
tools located
on respective first and second drums arranged facing each other, which tools
are
accelerable by at least one driving device associated therewith to a
peripheral speed
corresponding to a speed of a strip to be cut wherein the second drum is
mounted on
rockers associated with a separately controllable adjusting device consisting
of drives
effecting the cutting movement and support elements located between said
drives and
the rockers and that the support elements are shortenable to an effective
cutting
position to produce a cut.
In another aspect, the present invention resides in flying shears with cutting
tools located on drums facing each other, which tools are accelerable by at
least one driving device associated therewith to a peripheral speed
corresponding to a speed of the strip to be cut and with a separately
controllable adjusting device associated with a first one of said drums,
wherein
the second other one of said drums is mounted on rockers which are supported
by means of support elements which are shortenable to an effective cutting
position to produce a cut, the adjusting device has cranks which are connected
3

CA 02323356 2006-07-19
with the first drum, and said first drum is movable to produce the cut through
paraxial displacement towards the second drum.
The invention is explained in greater detail by means of a drawing in which
Figure 1 shows in schematic representation shears according to the invention,
Figure 2 shows a further solution compared with Fig. 1 for the adjusting
drive,
Figure 3 shows the schematic representation of further shears according to the
invention, and
Figure 4 shows shears according to the invention integrated into a coiler.
Figure 1 shows shears 1 which have a drum 2 and a drum 3. The drum 3 is
carried by
a rocker 4. One arm of the rocker 4 is mounted pivotably around the pivot
point 5.
The drum 2 has a chisel 6, whereas the drum 3 is equipped with an anvil 7. The
drums 2 and 3 are rotary-driven by driving devices 8 to a peripheral speed
corresponding to the speed of the running strip 9. Thereby a mechanical or
electrical
or electronic synchronization respectively is provided between the drives 8
and thus
3a

CA 02323356 2006-10-11
between the drums 2 and 3. At the second end of the rocker 4, a support
element 10
is located, which support element is adjustable in its length and consists
essentially of
a piston-cylinder unit 11. The support element 10 is lined to a crank 12 which
is acted
upon by a drive 13.
The function of the shears 1 is as follows: The drums 2 and 3 are kept
constantly at a
corresponding peripheral speed or brought before a cut to the necessary
peripheral
speed respectively by the drives 8. The crank 12 is likewise constantly driven
or
brought before a cut to the corresponding rotational speed respectively.
Thereby the
ratio of the peripheral speeds between the drum 2 and the crank 12 can be set,
for
example to 1:8. A possible synchronization between the drum 2 and the crank 12
is
indicated by the line 14 or the line 14' respectively. Through the rotary
movement of
the crank 12, the crank 3 is moved constantly to and fro along the arrow 15.
If this
adjusting movement is to lead to the cut, the piston-cylinder unit 11 is
driven together
before the crank reaches the lower dead poinit and arrested if applicable. By
this
means the drum 3 is pivoted to a substantially reduced distance from the drum
2. On
the next reaching of the lower dead point of the crank 12, the corresponding
cut is
then executed. Through the synchronization between the crank 12 and the drum 2
it
is achieved that, when the crank 12 is positioned at the lower dead point, the
chisel 6
is facing the anvil 7, so that the strip 9 can be separated.
Figure 2 shows that, instead of the adjusting drive consisting of the crank
12, the drive
13 and the support element 10, a piston-cylinder unit 16 can be used, whereby
this
piston-cylinder unit has two separately pressurizable pistons. The upper
piston
corresponds to that of the piston-cylinder unit '11, whereas the lower piston
replaces
the crank 12 and the drive 13.
Figure 3 shows shears 1' which consist of the drums 2' and 3', whereby the
drum 3' is
held on the rocker 4'. The drum 2' is eccentrically mounted by means of a
crank 12'.
By means of an arresting device 17, the rocker 4' can be locked in the lower
position
of the piston of the piston-cylinder unit 11'. The function of the shears 1'
is as follows:
The drums 2' and 3' are constantly driven or accelerated before a cut to a
corresponding
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. CA 02323356 2006-10-11
peripheral speed respectively by the motor 8'. The same applies to the crank
12',
which is acted upon by the drive 13'. By this means the drum 2' executes,
besides the
circular movement effected by the driving device 8', a superimposed stroke
movement
effected by the crank 12'. If the strip 9' is to be cut, the piston-cylinder
unit 11', before
the chisel 6' reaches its upper point in the drawing, is retracted and blocked
by the
arresting device 17. By this means the distance between the drums 2' and 3' is
so
strongly reduced that the strip 9' is separated by the chisel 6' on the next
reaching of
the upper dead point.
Figure 4 shows a reverse coiler 18, whereby the strip 9 is led over a guide
pulley 19 to
the coiler 20. If the coiler 20 has the given number of windings and the strip
9 is to be
cut, the drum 2' ' is pivoted against the coiler 21, whereby the pivoting
movement can
be executed as specified with respect to Fig. 1 or Fig. 3. The coiler 21 acts
as the
corresponding anvil. After the executed cut, the strip 9 can be coiled
immediately into
the coiler 21.
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CA 02323356 2000-09-08
Sutv~y of r~Arence numbers
1 Sheors
2 Drum
3 ~ Drum
A Rocker
Pivot point
6 Chisel
7 Anvii
8 driving devicE
i o . 9 Sfip
70 Support element
Piston-cylinder unit
7 2 Crvnk
13 Drive
~ 4 >~ U~
15 Arrow
16 Piston-cylinder unit
17 Arresting device
18 Reverse cotter
19 Guide pulley
20 Coiler
21 Cotter
6

Representative Drawing