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|United States Patent Application
;   et al.
December 15, 2011
STRIP COILER FOR STARTING AND FINISHING TO COIL METAL STRIPS
Disclosed is a strip coiler for coiling a metal strip (20), comprising a
coiling mandrel (21), pressing rollers (26) associated with the coiling
mandrel (21), and adjustable deflection shells (28) for pressing the
leading edge (24) of the metal strip (20) against the coiling mandrel
(21). The disclosed strip coiler is characterized in that at least one of
the deflection shells (28) has a tip (22) which is adjustable relative to
the deflection shell (28).
Kipping; Matthias; (Herdorf, DE)
; Hofer; Helmut; (Hilchenbach, DE)
; Irle; Reinhard; (Hilchenbach, DE)
; Raschke; Uwe; (Haiger, DE)
; Muller; Heinz-Adolf; (Wilnsdorf, DE)
; Sudau; Peter; (Hilchenbach, DE)
; Holzhauer; Thomas; (Kirchhundem, DE)
SMS SIEMAG AKTIENGESELLSCHAFT
February 22, 2010|
February 22, 2010|
August 23, 2011|
|Current U.S. Class:
|Class at Publication:
||B21B 3/00 20060101 B21B003/00|
Foreign Application Data
|Feb 23, 2009||DE||10 2009 010 205.1|
14. A strip coiler for coiling a metal strip, comprising: a coiling
mandrel; and at least one deflecting shell with a tip for deflecting the
metal strip around the coiling mandrel, wherein the tip is mounted in the
deflecting shell and is adjustable relative to the deflecting shell.
15. The strip coiler according to claim 14, wherein the deflecting shell
and/or the tip have, at sides facing the coiling mandrel, a curvature
substantially common with a curvature of the coiling mandrel and the
metal strip coiled thereon.
16. The strip coiler according to claim 14, wherein the tip is adjustable
out of a contact pressure position from the coiling mandrel by a rotary
movement and/or a linear movement relative to the deflecting shell.
17. The strip coiler according to claim 14, wherein the tip is moveable
hydraulically, mechanically or electromechanically.
18. The strip coiler according to claim 14, wherein the deflecting shell
has a front end with a deflecting shell head, the tip being fixedly
mounted at the deflecting shell head and being pivotable relative to the
deflecting shell by turning of the deflecting shell head.
19. The strip coiler according to claim 18, wherein the tip is integral
with the deflecting shell head.
20. The strip coiler according to claim 14, wherein the tip is arranged
so that a distance of the tip relative to the coiling mandrel in a
contact pressure position is adjustable depending on a thickness of the
metal strip to be coiled.
21. The strip coiler according to claim 20, further comprising a device
for adjusting the deflecting shell heart relative to the deflecting
shell, wherein the device includes a position-measuring device.
22. The strip coiler according to claim 21, wherein the adjusting device
is a hydraulic cylinder.
23. The strip coiler according to claim 21, wherein the
position-measuring device comprises a computing unit for computing the
distance to be adjusted.
24. The strip coiler according to claim 20, further comprising two stops
that define a range, wherein the tip is moveable in the range between the
25. The strip coiler according to claim 24, wherein at least one of the
stops is adjustable.
26. The strip coiler according to claim 18, wherein the deflecting shell
head can be pivoted or pulled away from the coiling mandrel when a
predetermined force acting on the tip is exceeded.
27. The strip coiler according to claim 14, further comprising contact
pressure rollers for pressing the metal strip against the coiling
28. The strip coiler according to claim 27, wherein the contact pressure
rollers press the front edge of the metal strip against the coiling
29. A method for operating a strip coiler for coiling a metal strip, the
strip coiler including a coiling mandrel and at least one deflecting
shell with a tip for deflecting the metal strip around the coiling
mandrel, wherein the tip is mounted in the deflecting shell and is
adjustable relative to the deflecting shell, the method comprising the
steps of adjusting the tip mounted in the deflecting shell relative to
the deflecting shell and the coiling mandrel depending on a coiling
situation of the metal strip.
 The invention relates to a strip coiler for coiling a metal strip,
with a coiling mandrel, contact pressure rollers assigned to the mandrel,
and adjustable deflecting shells for pressing the front end of the metal
strip against the coiling mandrel.
 In rolling mills, metal strips are shaped into plates or coiled
coils for facilitating the transportation and further processing by the
customer. The coils are created when a metal strip conveyed in a straight
direction is to be coiled radially in a coiling plant. The metal strip is
a product of, for example, a cold strip rolling train or a hot strip
rolling train. Depending on the type of plant, the temperature of the
metal strip may be up to 800.degree. C.
 Coiling plants operate in such a way that a metal strip is guided
on a rotating coiling mandrel. For this purpose, guide elements, such as,
deflecting shells, deflecting rollers, belts or the like are used. When
the coiling mandrel after the start-up supports the metal strip and the
strip tension is built up, the guide elements can be pivoted away from
the metal strip. If necessary, the guide elements can be pivoted back
again when the strip end has been reached, and when the metal strip
threatens to lose the tension by disengagement from the roll stand or the
drive apparatus of the coiling plant. This prevents the strip end from
flapping around because of its centrifugal forces or its own stiffness
and damaging the guide elements and the strip surface. It also prevents
the coil from losing its shape due to the loss of tension in the strip
and, is similar to a clock spring when no radial force acts from the
outside on the coil.
 DE 29 39 894 A1 discloses a strip coiler for coiling strips into
coils which includes contact pressure rollers for pressing a strip to be
coiled against a drum. The strip coiler further includes guide aprons for
guiding the strip at the circumference of the drum in the circumferential
areas between the contact pressure rollers. The contact pressure rollers
and the guide aprons are held by frame components which can be pivoted
independently of each other.
 JP 56 109114 A discloses a strip coiler that has two guide elements
or deflecting shells for pressing a strip to be coiled against a coiling
mandrel. Both guide elements are pivoted toward or away from the mandrel
by a fluid controlled cylinder.
 In accordance with further prior art shown in FIGS. 1, 2 and 3, the
coiling procedure operates in such a way that a metal strip 1 (FIG. 1),
which is to be coiled onto a coiling mandrel 2, travels through a coiling
shaft 3 which is formed, on the one hand, by a deflecting shell 4 and, on
the other hand, by a shaft flap 5. Moreover, the metal strip 1 when being
coiled onto the coiling mandrel 2, is guided by additional deflecting
shells 6, 7 and by contact pressure rollers 8, 9, 10 arranged between the
deflecting shells 4, 6, and 7. The contact rollers 8, 9, 10 ensure that
the metal strip 1 tightly contacts the coiling mandrel 2.
 After a front edge 11 of the metal strip 1 has traveled past the
deflecting shells 6, 7 and the contact pressure rollers 8, 9, 10, it
travels past the deflecting shell 4 and a front tip 12 mounted on the
deflecting shell 4. Because of the unfavorable shape of the tip 12, the
metal strip 1 may impact with its front edge 11 almost perpendicularly
against the subsequent metal strip 1 which follows from a direction 13
through the coiling shaft 3. In this connection, bulging 14 (FIG. 2) of
the metal strip 1 may occur if the impingement of the metal strip edge 11
against the subsequently conveyed metal strip 1 causes the edge 11 to be
stopped or decelerated. Accordingly, a great force acts on the front edge
11 and against the contact pressure rollers 8, 9, 10. The procedure
decreases the contact force between the metal strip 1 and the coiling
mandrel surface and thereby produces an additional bulging 14 of the
metal strip 1. A local lifting of the metal strip 1 from the coiling
mandrel 2 then inevitably occurs.
 The shape of the tip 12 (FIGS. 1, 2, 3) constitutes a first
embodiment of the tip of the deflecting shell 4 in the prior art. It is
preferably constructed in such an "obtuse" manner, that, with maximum
core diameter it cannot "dip" into the last winding 15 of a coil 16
formed by the metal strip 1 and damage the outwardly facing surface of
the last winding 15. Instead, for the start-up coiling process according
to FIG. 1, a more acute shape of the tip according to a second
embodiment, as it is illustrated in FIG. 3 with the reference 17, would
be advantageous for guiding the metal strip 1 during start-up coiling as
tightly as possible around the coiling mandrel 2. However, the tip 17
would then make contact with and damage in a disadvantageous manner the
outer winding 15 when the coil diameter has reached a certain size or its
maximum. The tip 17 could then also not be usefully realized because, as
a result of its construction, it would prevent the contact pressure
roller 10 from contacting the last winding 15 of the coil 16.
 It is the object of the invention to provide a strip coiler which
makes it possible in an optimum manner to coil a metal strip at the
beginning of a coiling procedure as well as in particular at the end of
the coiling procedure.
 In accordance with the invention, this object is met in a strip
coiler of the above-mentioned type in that at least one of the deflecting
shells is equipped with a tip which is adjustable relative to the
 By adjustably constructing the tip of the deflecting shell
according to the invention it is ensured on the one hand, that the metal
strip at the beginning of the coiling procedure is coiled as tightly as
possible onto the coiling mandrel, but, on the other hand, the tip is not
interfered with during the further coiling procedure. In particular does
not impede the placement of the last layer onto the coil. In particular,
the tip can advantageously be moved, after coiling the first winding on
the mandrel, out of the coiling area of the metal strip without already
having to move the deflecting shell relative to the coiling mandrel.
 Particularly useful has been found to be an embodiment of the tip
or of the deflecting shell supporting the tip, with a contour which at
least essentially is curved like the oppositely located coiling mandrel
and the metal strip placed thereon.
 Preferably, the tip can be adjusted relative to the deflecting
shell by a rotary movement or a linear movement, wherein both movements
may also be superimposed or carried out successively. During the course
of the coiling procedure, the tip can be transferred from the contact
pressure position at the beginning of the coiling procedure with
increasing number of wound coils of the coil into a position of rest
which is further removed from the coiling mandrel. Prior to the beginning
of another coiling procedure, the tip is once again returned into the
contact pressure position or toward the coiling mandrel.
 Different ways are possible for driving the tip. A hydraulic,
mechanical or electromechanical manner of operation is conceivable.
 The strip coiler is advantageously constructed in such a way that
the tip is arranged at a front end of the deflecting shell at a
deflecting shell head. In other words, the tip can be constructed as a
deflecting shell head. In this regard, the tip is adjustable by rotating
the deflecting shell head relative to the deflecting shell, particularly
pivotable away from the contact pressure position.
 Since metal strips having different strip thicknesses should be
coiled with the same strip coiler, in accordance with an advantageous
embodiment of the strip coiler, the distance assumed by the tip in
relation to the coiling mandrel in the contact pressure position can be
adjusted corresponding to the thickness of the metal strip to be coiled.
 It can advantageously also be provided that a device for adjusting
the contact pressure position of the tip, particularly a hydraulic
cylinder for pivoting the deflecting shell head, is equipped with a
position-measuring device. The thickness of the metal strip can then be
directly converted into a distance measure for the adjustment of the
contact pressure position of the tip.
 For this purpose, the position-measuring device advantageously
comprises a computing unit for computing the spacing to be adjusted.
Moreover, it is advantageous if the tip can be moved in an area between
 Advantageously, it is also possible if at least one of the stops is
adjustable, particularly by a stack of shims.
 In order to avoid damage of the tip of the metal strip, in an
advantageous embodiment of the invention, the tip or the deflecting shell
head are pivoted or pulled away from the coiling mandrel if a
pre-determined force acting on the tip is exceeded.
 Advantageous further developments of the invention result from the
 In the following the invention will be explained in more detail in
an embodiment. In the drawing:
 FIG. 4 is a cross-sectional view of a strip coiler with adjustable
 FIG. 5 is a cross-sectional view of a strip coiler with a detailed
illustration of a drive for the adjustable tip; and
 FIG. 6 shows a schematic view of a control circuit for adjusting
the position of the tip illustrated in FIG. 5, while taking into
consideration the force exerted by the metal strip on the tip.
 The goal of the invention resides in that during each as tightly as
possible around a coiling mandrel 21. The purpose of this is to ensure
that as early as possible a tension is produced in the metal strip 20,
i.e., between the coiling mandrel 21 and a drive apparatus, not
illustrated here. In addition, during the coiling procedure, the metal
strip 20 should not separate from the coiling mandrel 21. Impacts, as
they occur in the prior art by impingement of the front edge 11 of the
metal strip 1 (FIG. 2) against the metal strip 1 entering the coiling
shaft 25 are to be avoided, so that the entering metal strip 20 is
tightly wound around the coiling mandrel 21 and forms no bulging 14, as
it is illustrated in FIG. 2. The start-up coiling procedure is altogether
made safer by the invention and takes place without impacts and
 For this purpose, the front edge 24 of the metal strip 20 during
start-up (region 23) is guided by a suitably pointy shaped tip 22
tangentially or almost tangentially relative to the metal strip 20 which
is conveyed through the coiling shaft 25. In this manner, it is ensured
that in the area of a contact pressure roller 26 only the thickness
difference due to the additional layer of the metal strip 20 makes itself
felt. The tip 22 and a deflecting shell 27, on which the tip 22, is
adjustably mounted, both have at least essentially the same curvature as
the coiling mandrel 21.
 While this makes possible an optimum start-up procedure, on the one
hand, in accordance with the invention, however, the problem must be
solved, on the other hand, that the tip 22 when the coiling procedure has
ended, does not project into the space area which is occupied by the
outer windings 15 of the coil 16. Thus, according to the invention, it is
to be provided that the tip 22, on the one hand, during start-up coiling
guides the metal strip 20 and, on the other hand, is not an obstacle when
the coiling procedure is ending.
 In view of this the invention makes available a mechanism which
makes it possible to pivot the tip 22 away from the coil. The tip 22
(FIG. 5) is for this purpose integrally shaped onto a round rod-shaped
deflecting shell head 30 which is arranged so as to be rotatable about at
least one point of rotation 29. The deflecting shell head 30 with the tip
22 is received in a deflecting shell 28 and is pivotally supported
opposite the latter. The contour of the deflecting shell head 30 is
formed with the tip 22 in the area of the coiling shaft 25 by a straight
line 31. In the vicinity of the coiling mandrel or the coil 16, the shape
of the tip 22 is obtained by an at least essentially circular shaped or
similar to circular shaped contour 32 with at least one radius which is
adapted to the radius of the coiling mandrel 21 or the coil 16.
 A double arrow 33 shows the possible rotating or pivoting movements
that the tip 22 can carry out with the deflecting shell head 30 relative
to the deflecting shell 28. When the tip 22 is pivoted with the
deflecting shell head 30 relative to the deflecting shell 28 from the
start-up position, in the following also called contact pressure
position, into the position which is to be assumed when the coiling
process has ended, the deflecting shell head 30 pivots with the tip in
the clockwise direction. The deflecting shell head 30 has at least one
pivot arm 34 which is rotatably hinged to a piston rod 35 of a pneumatic
or hydraulic cylinder 36. This cylinder is capable of moving the
deflecting shell head 30 with the tip 22 in the direction of the arrow
 Basically for moving the deflecting head 30, not only rotary
movements but also linear movements or both can be considered, see arrows
33, 37. Correspondingly, a plurality of cylinders can be provided which
carry out one or the other movement of the tip. The various types of
movement can be carried out superimposed or successively with respect to
 In order to ensure that the object of the tangential guiding of the
metal strip 20 takes place in an optimum manner, especially during
start-up coiling with varying strip thicknesses by the front tip 22, it
is useful to construct the distance 39, which extends from the surface of
the coiling mandrel 21 or the outer winding 15 of the coil 16 up to the
oppositely located surface of the deflecting shell head 30, so as to be
adjustable. For this purpose, the hydraulic cylinder 36 is coupled to a
position-measuring device 38. The position measuring can be realized with
different principles, for example, through a volumetric flow meter which
measures the volume of the fluid in the hydraulic cylinder 36. In the
same manner an electrical pickup can be present. If the position of the
hydraulic cylinder 36 is known, it is possible by means of an algorithm,
which takes into consideration the geometry of the deflecting shell head
30, the deflecting shell 28, the coiling mandrel 21, and the coiling
layers of the metal strip 20 placed onto the coiling mandrel, to compute
an actual value for the distance 39, and it is then possible to adjust
the distance 39 to a desired value. The adjustment takes place through a
movement of the tip 22, possibly with the deflecting shell head 30,
relative to the movement of the tip 22.
 In order to protect the tip 22 of the deflecting shell head 30
against damage, it is possible that the cylinder 36 has pivoted the
deflecting shell head 30 from the metal strip when reaching a
pre-adjusted upper force limit and, thus, the front edge 24 of the metal
strip 20 is released. By means of a regulating circuit (FIG. 6), a
position of the tip 22 and/or the force for maintaining the position of
the tip 22, can be regulated.
 The deflecting shell 28 has at least one first stop 40 which limits
the left handed rotation of the deflecting shell head 30, and at least
one second stop 41 which limits the right handed rotation of the
deflecting shell head 30. An edge 42 of the deflecting shell head 30 can
be moved at most up against the stop 41. In this manner, it is prevented
that the deflecting shell head 30 in the event of a right-handed rotation
impinges against the coiled metal strip 20 and damages its surface.
 Preferably the two stops 40 and 41, can be adjusted, for example,
by stacks of shims, so that the deflecting shell head 30 can be regulated
very simply even when the coiler is intended to coil only a single strip
thickness or strips with a limited strip thickness range.
 FIG. 6 illustrates a position regulating circuit for adjusting an
intended position of the hydraulic cylinder 36 or of the tip 22 by means
of a subordinate regulating circuit for force regulation. Thereby, the
actual position of the tip approaches the predetermined intended position
at most only up to reaching a predetermined force limit. By means of the
pressure in the hydraulic cylinder 36 measured by a manometer and the
actual force corresponding thereto, the subordinate force regulating
circuit regulates the contact pressure of the tip against the metal strip
in the actual position to a predetermined intended force which can be
smaller than the force limit.
 In accordance with the invention, the contact pressure force of the
contact pressure roller 26 and/or the distance 43 of (FIG. 4) relative to
the coiling mandrel 21 can also be adjusted. The adjustment preferably
takes place by responding to the results determined by the regulating
circuit according to FIG. 6.
LIST OF REFERENCE NUMERALS
 1. Metal strip  2. Coiling mandrel  3. Coiling shaft
 4. Deflecting shell  5. Shaft flap  6. Deflecting
shell  7. Deflecting shell  8. Contact pressure roller 
9. Contact pressure roller  10. Contact pressure roller  11.
Front edge of metal strip 1  12. Tip  13. Direction 
14. Bulging  15. Outer winding  16. Coil  17. Tip
 18. --  19. --  20. Metal strip  21. Coiling
mandrel  22. Tip  23. Area of impingement  24. Front
edge of metal strip 20  25. Coiling shaft  26. Contact
pressure roller  27. Deflecting shell  28. Deflecting shell
 29. Point of rotation  30. Deflecting shell head  31.
Straight line  32. Circular contour  33. Arrow  34. Arm
 35. Piston rod  36. Hydraulic cylinder  37. Arrow
 38. Position-measuring device  39. Distance  40. Stop
 41. Stop  42. Edge  43. Distance  44. Gap
* * * * *