EP2982452B1 - Method for producing a coil from metallic strip - Google Patents

Description

The invention relates to a method for producing a coil of metallic strip, in which the tape wound on an expandable coiler mandrel and the finished wound coil deposited on a coil car and transported away from the coiler mandrel.

A generic method is well known in the manufacture of steel strips and bands of other metallic material. In the case of thin hot-rolled strips, there is a risk that the coil inner coil will collapse during despreading of the coiler mandrel and that we will later release a few turns during transport and cooling of the coil. With decreasing hot strip thickness and higher production rate of thin strip this effect is increasingly disturbing. In order to be able to process these coils, the coil inner coils must be laboriously reworked manually or other measures must be taken to avoid this problem.

In the prior art, various measures are known to remedy this situation. From the DE 101 42 179 A1 It is known to provide a profiling of the coiler mandrel. Also, an insert of a spreading adapter is provided for each coil eye. It is also possible a gluing of tape turns. The JP 09 201620 provides an optimization of the positioning of the tape end in the coil eye. According to the JP 61 038711 a device for reworking the Innenwindung is provided. Next, the use of cores can be provided on the coiler mandrel. Special measures in sleeve handling are also envisaged, as well as special sleeve-pulling, sleeve-changing and sleeve-pulling devices. This is on the US 6,354,534 , on the US 3,062,465 , on the EP 1 778 420 B1 and on the DE 87 11 281 U1 to point. Other solutions that deal with to deal with the objective problem, are from the DE 10 2007 051 976 A1 , from the US 5 705 782 A , from the JP H07 214 160 A and from the WO 2004/060589 A1 known.

The preamble of claim 1 is based on DE 10 2007 051 976 A1 , The invention has the object of providing a generic method as well as an associated device in such a way that the windings can be stabilized in the inner region of the coil in an efficient manner.

1. a) Aufwickeln des Bandes auf den gespreizten Haspeldorn;
2. b) Aufnehmen des fertig gewickelten Coils auf dem Bundwagen;
3. c) Entspreizen des Haspeldorns;
4. d) Herausfahren des Coils vom Haspeldorn durch eine Relativbewegung zwischen Haspeldorn und Bundwagen in Richtung der Achse des Haspeldorns, wobei eine solche Verfahrbewegung erfolgt, so dass das axiale Ende des Haspeldorns von der Stirnseite des Coils im Coilauge liegend um einen vorgegebenen Betrag entfernt ist, wobei der vorgegebene Betrag kleiner ist als die Breite des Coils;
5. e) Spreizen des Haspeldorns;
6. f) Während der Haspeldorn gespreizt ist: Setzen einer Fixierung zwischen mindestens zwei übereinander liegenden Bandteilen des Bandes in dem Bereich des Coilauges, aus dem der Haspeldorn entfernt wurde;
7. g) Entspreizen des Haspeldorns und vollständiges Herausfahren des Coils vom Haspeldorn durch eine Relativbewegung zwischen Haspeldorn und

The solution of this problem by the invention is characterized in that the method comprises the steps:

1. a) winding the tape on the spread coiler mandrel;
2. b) picking up the finished coil on the coil car;
3. c) despreading the coiler mandrel;
4. d) moving out of the coil from the coiler mandrel by a relative movement between the coiler mandrel and bundle carriage in the direction of the axis of the coiler mandrel, wherein such a movement takes place, so that the axial end of the coiler mandrel lying away from the end of the coil in the coil eye by a predetermined amount, wherein the predetermined amount is smaller than the width of the coil;
5. e) spreading the coiler mandrel;
6. f) While the reel mandrel is spread: Setting a fixation between at least two superimposed band parts of the band in the region of the coil eye, from which the coiler mandrel was removed;
7. g) despreading of the coiler mandrel and complete retraction of the coil from the coiler mandrel by a relative movement between reel mandrel and

Bundwagen in the direction of the axis of the coiler mandrel.

Before the above step g), according to a preferred embodiment of the invention, the above steps c) to f) are repeated at least once, wherein at step d) then a greater movement occurs than in the first execution of step d), so that the axial end the reel mandrel is located away from the end of the coil in the coil eye by a larger predetermined amount, wherein the larger predetermined amount is smaller than the width of the coil.

In the above step f), a connection between at least two superimposed band parts is preferably produced by material connection, in particular by electrical or autogenous spot welding, by gluing or by soldering.

But it is also possible that at said step f) a connection between at least two superimposed band parts of the band is produced by positive locking, in particular by nailing, screwing or riveting.

Preferably, a turning reel is used, which has at least two working positions, in particular a Coilanwickelposition and a Coilaustrageposition, wherein the above steps b) to g) are performed at one of the working positions, while at another working position, the winding of the tape to the coil.

During the implementation of the above step d), the area of the band end in the coil eye can be pressed radially outwards by means of a holding device, in particular by means of a band return rod, wherein the holding device is moved together with the coil carriage. This prevents "bagging".

During the execution of the above step d) can also be pressed against one of the axial end faces of the coil, a flat plate, so that the innermost turns of the tape can not escape axially from the coil; this also prevents the formation of "bags".

A device not according to the invention for carrying out the method has an expandable coiler mandrel and a coil trolley on which the finished wound coil can be deposited and removed from the coiler mandrel, wherein it is provided according to the invention that the apparatus further comprises a welding robot having a welding head, the is designed for introduction into the coil eye, wherein the welding robot and / or the welding head and / or the power supply to the welding robot is provided with a thermal insulation and / or wherein the welding robot and / or the welding head and / or the power supply to the welding robot with a water cooling is provided.

Advantageously, it can be provided that the above-mentioned fixing process (in particular the welding process) is combined with the removal operation of the coil from the coiler mandrel.

The fixing process, d. H. in particular the welding process, is preferably carried out in hot strips with a strip thickness of less than 1.2 mm. The fixing operation is furthermore preferably carried out on hot strips which are produced by endless or semi-endless rolling; Again, their thickness is preferably less than 1.2 mm.

Furthermore, it is preferably provided that the fixing process is carried out in strip materials of low strength, in which case particular consideration is given to those strengths which are at R _P02 <300 N / mm ² , defined under cold conditions.

Finally, it can be provided that the fixing operation is carried out at high reeling temperatures of more than 400 ° C.

The supplied welding energy - d. H. the welding voltage or the welding current or the welding temperature and / or the welding time - are preferably selected depending on the reel temperature, the strip thickness and / or the strip material; the control of this can be done by means of a process model.

Preferably, only the ribbons of a production program are fixed or welded, in which the coil inner coils tend to collapse (eg due to the thickness of the band, the degree of hardness of the band and / or the temperature). For the remaining bands of the production program, the fixing or welding process is not carried out. This procedure is also preferably controlled by a process model.

The invention is based on the idea that a safe way to avoid a collapse of the inner coil in the coil eye is that For example, a spot welding or stapling of the coil eye already takes place during the discharge of the coil from the reel. A suitable welding machine is used for example in the US 5,705,782 to which reference is made so far. Before annealing, coils are welded with such a machine. This device can also be used in the secure production and further processing of thin strips.

Particularly advantageous is the use of such a method for welding the coil eye in the production of thin hot strips with thicknesses of less than 1.2 mm. For thin strip production continues to offer the endless or semi-endless rolling. At least two reels are required for these rolling processes. It is therefore particularly advantageous if a reversible reel is used. Then only one processing device is required for the coil eye, in contrast to two normal underfloor reels.

However, the said means for fixing the Coilinnenwindung can not only be used when using a reversible reel, but also be used in conventional underfloor reels or overhead reels.

As a special type of spot welding, arc spot welding or the TIG or MIG / MAG process can be used by melting two metal sheets in a punctiform manner. Welding can be done with or without the use of inert gas. The pressure plate of the welding unit can be adapted to the non-even surface (due to the coil curvature). The welding spot or the welding line can be placed directly at the top of the belt or in the middle of the belt.

In normal spot welding, arc spot welding or even autogenous welding, the intensity of the welding energy to the Coil conditions (thickness, temperature, material, surface) preferably model-supported adapted.

Fig. 1

schematisch einen Wendehaspel zum Wickeln eines Bandes,

Fig. 2

in der Seitenansicht einen gespreizten Haspeldorn, auf dem ein Coil aufgewickelt ist, wobei unterhalb des Coils ein Bundwagen platziert ist,

Fig. 3

in der Seitenansicht den entspreizten Haspeldorn samt Coil, wobei das Coil auf dem Bundwagen abgelegt ist,

Fig. 4

in der Vorderansicht die Darstellung des entspreizten Haspeldorns und des Coilauges des Coils,

Fig.5

in der Seitenansicht den entspreizten Haspeldorn samt Coil und Bundwagen, wobei eine Bandandrückstange zwischen Haspeldorn und Coilauge eingeschoben ist,

Fig. 6

in der Seitenansicht den entspreizten Haspeldorn samt Coil und Bundwagen, wobei das Coilauge teilweise von dem Haspeldorn ausgezogen und ein Schweißkopf in eine erste Position in das Coilauge eingeschoben ist,

Fig. 7

in der Seitenansicht den entspreizten Haspeldorn samt Coil und Bundwagen, wobei das Coilauge weiter von dem Haspeldorn ausgezogen und ein Schweißkopf weiter in das Coilauge eingeschoben ist,

Fig. 8

in der Seitenansicht den Haspeldorn samt Coil und Bundwagen, wobei eine Anpressplatte an eine Stirnseite des Coils angedrückt ist, und

Fig. 9

die zu Fig. 8 zugehörige Vorderansicht.

In the drawings, embodiments of the invention are shown. Show it:

Fig. 1

schematically a turning reel for winding a tape,

Fig. 2

in the side view of a spread coiler mandrel on which a coil is wound, wherein below the coil a coil car is placed,

Fig. 3

in the side view the despread coiler mandrel including coil, wherein the coil is placed on the coil car,

Fig. 4

in the front view the representation of the despread reel mandrel and the coil eye of the coil,

Figure 5

in the side view the despread coiler mandrel including coil and coil car, wherein a Bandandrückstange is inserted between coiler mandrel and Coilauge,

Fig. 6

in the side view the despread coiler mandrel including coil and coil car, wherein the coil eye partially pulled out of the coiler mandrel and a welding head is inserted into a first position in the coil eye,

Fig. 7

in the side view the despread coiler mandrel including coil and coil car, wherein the coil eye pulled further from the coiler mandrel and a welding head is inserted further into the coil eye,

Fig. 8

in side view the coiler mandrel including coil and coil car, with a pressure plate is pressed against an end face of the coil, and

Fig. 9

the too Fig. 8 associated front view.

In Fig. 1 is a turnable reel 5 can be seen, which has a left arranged Coilanwickelposition and a right Coilaustrageposition. The present existing two reel mandrels 2 are spreadable; on them a coil 1 can be wound up. Below the wound coil 1, a coiler 3 is arranged in the Coilaustrageposition.

In the area of the coil discharge position, a welding robot 9 with a welding head 10 is furthermore arranged.

As in the FIGS. 2 and 3 can be seen, the coiler mandrel 2 take a spread and a despread position. In the figures, the outer circumference of the coiler mandrel is indicated in the expanded state with b and the outer circumference in the despread state with c. The coiler mandrel 2 has an axis a. The coil 1 has a width B. In Fig. 2 the coil 1 is still added to the coiler mandrel 2, which is in the spread state. In Fig. 3 is the coil 1 deposed on the coil car 3; the coiler mandrel 2 is despread.

In the despread state has in the coil eye 4 - as in Fig. 4 can be seen - and in the despread state of the coiler mandrel 2 a loose winding 11 space for movement; the band tip is indicated with 13. This movement possibility with despread reel mandrel 2 can be prevented by a Bandandrückstange 6, which engages with a tip 12 in the Coilauge when the Coilauge 4 is at least partially withdrawn from the coiler mandrel. These relationships are also in Fig. 5 shown.

As explained above, the coil eye 4 is first pulled a certain amount from the coiler mandrel 2, as in Fig. 6 is shown. From the left end side of the coil 1 of the coiler mandrel 2 is removed by a predetermined first position X1. In the resulting free space in the coil eye 4, the welding head 10 of the welding robot 9 can now enter and spot welded with its welding contacts 14 two superimposed windings of the tape. It is essential that before the welding of the coiler mandrel 2 is spread again to place the windings clean one above the other.

As in Fig. 7 can be repeated, said process can be repeated, wherein the coil eye 4 has now been pulled up to a larger predetermined position Xi of the coiler mandrel 2; the welding head 10 enters deeper into the coil eye 4 and sets one or more corresponding welding points.

In the FIGS. 8 and 9 is shown as an alternative to Bandandrückstange 6, the "bag formation" can be prevented. After that, a pressure plate 8 is placed on the axial end face 7 of the coil 1, which is held by a holder 15. The pressure plate 8 has a circular cutout (s. Fig. 9 ), so that a clean completion of the front side of the coil eye 4 is achieved. The emergence of a turn of the band and thus the "bag formation" in the relative movement of the coil 1 relative to the coiler mandrel 2 is thus prevented.

The use of a welding machine (welding robot) is therefore in Fig. 1 shown. After being wound on the coiler mandrel, the still developing (winding) coil is moved from the coil winding position to the coil discharge position. The new coil winding position will be released again for the next band. The welding robot waits beside the line until the coil is finished. Only then take place the discharge of the coil by means of coil cars and thereby taking place the coil eye while the follower coil is wound.

For spot welding, it should be noted that the electrode voltage or the electrode current and / or the welding time are optionally selected depending on the coil temperature, the strip thickness and optionally the strip material. It can also take place a targeted cooling of the wound coil in the weld area, for example, in addition to the thermal protection of the unit to promote the welding process. Depending on the boundary conditions, welding takes place at the respective axial position only at one point or at several points at the same time.

In order to enable welding in the hot environment, the support arm and the welding head area are thermally protected by insulation, water cooling (inside and / or outside) and minimization of the residence time in the high temperature range (for example, welding the robotic arm into the coil eye only for welding). The thermal protection is also useful for the current flow in the support arm.

The points bonded by spot welding stably hold the inner turn of the tape together. When unwinding the coil during further processing, the spot weld can easily be torn away. The damaged band areas of approx. 4 m are cut off and disposed of, which does not mean a large output loss with a thin, long band.

Instead of electric spot welding, autogenous welding or alternatively stapling by other means (eg mechanically by means of nails or screws) is also possible. In special cases, an adhesive or solder can be used by the agent between two turns sprayed or otherwise applied or applied. For stapling, gluing or soldering, a suitably prepared robot head is also used (stapling, gluing or soldering robot).

Optionally, the outer winding can also be welded or fastened with the same welding robot or tacking, bonding or soldering robot, which represents an alternative to binding, especially in the case of thin strip.

Preferably, the proposed method of processing the Coilinnenwindung takes place in tapes with a tape thickness of less than 1.2 mm. Further preferred is an endless rolling or a semi-continuous rolling of hot strip.

Then, the method is particularly suitable for materials such as sheet or low strength silicon _steel (R _P02 <300 N / mm ² in the cold state).

Further preferred is the use of a turning reel. The reel temperatures are preferably above 400 ° C.

A combination of the features mentioned is possible.

Furthermore, only the bands of a product program are fixed or welded, in which the Coilinnenwindungen show a tendency to coincide (for example, thin, soft, warm). For the remaining bands, the fixing or welding process is not performed. This decision is determined by means of a process model.

Furthermore, preferably takes place the winding of the thin strip on a splayed coiler mandrel. As a further aid to the process, the tape tip region may be cooled with water prior to winding, or the tip may be wound warmer than the remainder of the tape.

• Das Coil 1 wird zum Stillstand gebracht, so dass das Bandende optimal für das spätere Binden und die Weiterverarbeitung positioniert ist. Der Bundwagen 3 bewegt sich nach oben und trägt das Coil, so dass der Haspeldorn 2 entspreizt werden kann. Der für jeden Haspel normale Ablauf ist in Fig. 2 und in Fig. 3 zu sehen. Nach dem Entspreizen fällt die lose Innenwindung 11 herunter, wie es in Fig. 4 angedeutet ist. Nun kann der Bundwagen 3 das Coil 1 beispielsweise in Richtung Bedienungsseite (BS) austragen. Bevor der Bundwagen 3 losfährt, kann optional die Bandandrückstange 6 zwischen Dorn 2 und Coil 1 gebracht werden, wie es in Fig. 5 zu sehen ist. Die Bandandrückstange 6 drückt dann beim gemeinsamen Herausfahren das Bandende im Coilauge 4 nieder, fixiert es und verhindert so eine "Tütenbildung" infolge Reibkontakt zwischen Band und Haspeldorn. Zum besseren Einfädeln der Spitze der Bandandrückstange 6 in den Spalt zwischen Coil und entspreiztem Haspeldorn kann optional der Bundwagen 3 etwas abgesenkt werden.

To summarize the following again summarized:

• The coil 1 is brought to a standstill, so that the end of the tape is optimally positioned for later binding and further processing. The coil carriage 3 moves upwards and carries the coil, so that the coiler mandrel 2 can be despread. The normal process for each reel is in Fig. 2 and in Fig. 3 to see. After despreading, the loose inner coil 11 falls down, as in Fig. 4 is indicated. Now, the coil car 3, the coil 1, for example, in the direction of operating side (BS) unsubscribe. Before the Bundwagen 3 goes off, optionally the Bandandrückstange 6 can be brought between the mandrel 2 and coil 1, as it is in Fig. 5 you can see. The Bandandrückstange 6 then presses the common end out the tape end in the Coilauge 4 down, it fixes and prevents a "bag formation" due to frictional contact between the belt and reel mandrel. For better threading the tip of Bandandrückstange 6 in the gap between the coil and despread reel mandrel, the coil carriage 3 can optionally be lowered slightly.

Instead of using a Bandandrückstange 6 accordingly 4 and 5 can also be used as an alternative to prevent the "bag formation" when discharging the coils, the pressure plate 8, which is placed on the back (ie the one end face 7) of the coil 1. Such a possibility is in 8 and 9 shown. Before carrying out the coil 1 so the pressure plate 8 is then placed behind the coil 1, that is pivoted to the coiler mandrel 2 and pressed laterally against the coil 1. Thereafter, the pressure plate 8 is moved down with its Bewegungsorgangen together with the coil 1 towards the operating side of the coiler mandrel 2.

The discharge of the coil 1 is interrupted when there is enough space (X1) for the welding robot head at the edge of the coil, as shown in FIG Fig. 6 you can see. The control program determines the position depending on the Bandwidth and the space requirement of the robot head. After removal of the Bandandrückstange (if used), the coiler mandrel is spread again and brings so the inner coil of the coil again to the plant. The welding robot moves to the edge of the coil (in the area "X1", s. Fig. 6 ) and connects the two last turns with each other, for example, and preferably by spot welding. This can be done at least one point or at several points over the circumference. During transport and subsequent winding, the position of the band tip is preferably tracked (using a process model: hot metal detector, distance, number of revolutions, etc.) or optically detects the band tip, so that the weld points can be optimally positioned.

After the welding process on the operating side, the despreading and further discharge of the coil takes place by means of the bundle wagon. Appropriately, the radially adjustable electrodes of the welding machine or the welding head are withdrawn. Optionally, the welding process can be repeated at other coil positions Xi, as in Fig. 7 is shown. Ie. after stopping the coil at the position Xi again spreading of the coiler mandrel and a subsequent spot welding done. For this purpose, the welding electrodes are brought back into contact with the Coilinnenwindung. The angular positions may be different from the previous welding position. After the last welding operation, the mandrel 2 is finally despread, the welding robot arm is withdrawn and the coil 1 is discharged and transported away. Now the discharge position for the next coil is free.

List of reference numbers :

1

coil

2

coiler mandrel

3

coil car

4

coil eye

5

decoiler

6

Holding device (Bandandrückstange)

7

axial end of the coil

8th

Plate (pressure plate)

9

welding robots

10

welding head

11

loose winding

12

Top of the tape push rod

13

ribbon lace

14

welding contact

15

Holder for plate

a

Axle of the coiler mandrel

X1

predetermined position or predetermined amount

Xi

larger predetermined position or greater predetermined amount

B

Width of the coil

b

Outer circumference of the coiler mandrel in the spread state

c

Outer circumference of the coiler mandrel in the despread state

AS

driving side

BS

operating side

Claims (7)

1. Method of producing a coil (1) of metallic strip, in which the strip is wound up on an expandable coiling mandrel (2) and the coil (1) wound to finished state is deposited on a coil carriage (3) and transported away from the coiling mandrel (2), wherein the method comprises the steps:

   a) winding up the strip on the expanded coiling mandrel (2);

   b) receiving the coil (1), which is wound to finished state, on the coil carriage (3); and

   c) contracting the coiling mandrel (2);

   characterised in that the method comprises the further steps:

   d) moving the coil (1) out from the coiling mandrel (2) by a relative movement between coiling mandrel (2) and coil carriage (3) in the direction of the axis (a) of the coiling mandrel (2), wherein such a travel movement is carried out that the axial end of the coiling mandrel (2) is spaced by a predetermined amount (X1) from the end face of the coil (1) and lies in the coil eye (4), wherein the predetermined amount (X1) is smaller than the width (B) of the coil (1);

   e) expanding the coiling mandrel (2);

   f) while the coiling mandrel (2) is expanded, placing fixing means between at least two strip parts, which lie one above the other, of the strip in the region of the coil eye (4) from which the coiling mandrel (2) has been removed; and

   g) contracting the coiling mandrel (2) and complete movement of the coil (1) out of the coiling mandrel (2) by a relative movement between the coiling mandrel (2) and coil carriage (3) in the direction of the axis (a) of the coiling mandrel (2).
2. Method according to claim 1, characterised in that prior to the step g) according to claim 1 the steps c) to f) according to claim 1 are repeated at least once, wherein in the case of step d) according to claim 1 a greater travel movement then takes place than in the case of the first execution of the step d), so that the axial end of the coiling mandrel (2) is spaced by a greater predetermined amount (Xi) from the end face of the coil (1) and lies in the coil eye (4), wherein the greater predetermined amount (Xi) is smaller than the width (B) of the coil (1).
3. Method according to claim 1 or 2, characterised in that in the step f) according to claim 1 a connection between at least two strip parts, which lie one above the other, is produced by material couple, particularly by electrical or autogenous spot-welding, by glueing or by soldering.
4. Method according to claim 1 or 2, characterised in that in step f) according to claim 1 a connection between at least two strip parts, which lie one above the other, of the strip is produced by mechanically positive couple, particularly by nailing, screwing or riveting.
5. Method according to any one of claims 1 to 4, characterised in that a reversing coiler (5) having at least two working positions is used, particularly a coil initial winding-on position and a coil discharge position, wherein the steps b) to g) according to claim 1 are carried out at one of the work positions whilst initial winding-on of the strip to form the coil (1) is carried out at another work position.
6. Method according to any one of claims 1 to 5, characterised in that while step d) according to claim 1 is being carried out the region of the strip end in the coil eye (4) is urged radially outwardly by means of a holding device (6), particularly by means of a strip pressing rod, in which case the holding device is moved together with the coil carriage (3).
7. Method according to any one of claims 1 to 6, characterised in that when the step d) according to claim 1 is being carried out a flat plate (8) is pressed against one of the axial end faces (7) of the coil (1) so that the innermost windings of the strip cannot axially exit from the coil (1).

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