EP2885091B1 - Method and device for a combined continuous casting and rolling system - Google Patents

Description

Field of engineering

The present invention relates to a method and an apparatus for producing hot-rolled products in a cast-rolling composite plant.

On the one hand, the invention relates to a method for the production of hot-rolled products in a cast-rolling composite plant, wherein in continuous operation a strand with slab or thin slab cross-section of an endless continuously cast semi-finished material after its complete solidification a device for cutting and discharging on a roller table in a transport direction undivided ie as a strand, the strand is then hot rolled in a finishing train, then cooled, cut and stored.

• eine Stranggießmaschine zum Stranggießen eines Strangs eines endlosen Vormaterials mit Brammen- oder Dünnbrammenquerschnitt; nachfolgend
• eine Einrichtung zum Zerteilen und Ausfördern, die eine Schere zum Abschneiden des Vormaterials zu einem Strangabschnitt oder zu einem Vormaterialabschnitt, eine Anhebeeinrichtung zum Anheben eines Fußteils des Strangabschnitts, und eine Ausfördereinrichtung zum Ausfördern des Vormaterialabschnitts umfasst; nachfolgend
• eine Fertigwalzstraße; nachfolgend
• eine Kühlstrecke; und nachfolgend
• eine Speichereinrichtung.

On the other hand, the invention relates to a cast-rolling composite plant for the production of hot-rolled products, comprising

• a continuous casting machine for continuously casting a strand of an endless material with slab or thin slab cross-section; following
• a cutting and discharging device comprising a pair of shears for cutting the primary material into a strand portion or a preliminary material portion, lifting means for lifting a foot portion of the strand portion, and discharge means for discharging the preliminary material portion; following
• a finishing train; following
• a cooling section; and below
• a storage device.

State of the art

From the WO 2009/121678 A1 The Applicant is a method and a so-called means for cutting and discharging for a cast-rolling complex known, with which it is possible to bridge a fault in a plant part after the means for cutting and discharging, without causing the casting operation in the Continuous casting machine must be interrupted. As a result, the reliability of the system is significantly increased. Specifically, the cutting and discharging device has two shears and a discharge device located between the shears, so that continuously produced primary material can be discharged as a primary material section in the disturbance. In order to prevent a collision between the endlessly produced primary material and the material in the cast-rolling composite plant during the disturbance, a lifting device is arranged after the rear shear. Although this solution has proven very successful in practice, it is disadvantageous that the device for cutting and discharging has a total length of about 15 m. Due to the high length, the strip cools down more on the way to the finishing mill, more scale is produced on the strip, and the investment costs (English CAPEX) and operating costs (English OPEX) are increased.

As with a comparatively high level of operational reliability, the overall length of the device for cutting and discharging can be reduced and the investment and operating costs of the cast-rolling composite system can be reduced, the document does not show.

Summary of the invention

• eine Störung in einem Anlagenteil nach der Einrichtung zum Zerteilen und Ausfördern überbrückt werden kann, ohne dass dabei der kontinuierliche Gießbetrieb der Stranggießmaschine unterbrochen werden muss,
• die Gesamtlänge der Einrichtung zum Zerteilen und Ausfördern reduziert werden kann, und
• die Investitions- und Betriebskosten der Gieß-Walz-Verbundanlage reduziert werden können.

The object of the invention is to overcome the disadvantages of the prior art and to provide a störunanfälliges method and a compact cast-rolling composite system with which

• a fault in a plant part can be bridged after the means for cutting and discharging, without having to interrupt the continuous casting operation of the continuous casting machine,
• the total length of the device for cutting and discharging can be reduced, and
• the investment and operating costs of the cast-rolled composite plant can be reduced.

1. a) Abschneiden des endlos produzierten Vormaterials zu einem Strangabschnitt durch eine Schere;
2. b) Klemmen des Strangabschnitts durch eine Klemmeinrichtung;
3. c) Anheben des Fußteils des Strangabschnitts vom Rollgang mittels einer Anhebeeinrichtung, wodurch der Fuß des Strangabschnitts in der Transportrichtung von der Schere weggezogen wird;
4. d) Schneiden des die Schere passierenden Vormaterials zu einem Vormaterialabschnitt mittels der Schere;
5. e) Ausfördern des Vormaterialabschnitts vom Rollgang durch eine Ausfördereinrichtung, und Entfernen des Strangabschnitts bis zur Wiederherstellung der Betriebsbereitschaft der Gieß-Walz-Verbundanlage.

In the case of the method mentioned at the outset, this object is achieved by carrying out the following method steps in the device for cutting and discharging for bridging a production interruption in a plant part which is downstream of the device for cutting and discharging:

1. a) cutting the endless produced starting material to a strand section by a pair of scissors;
2. b) clamping the strand section by a clamping device;
3. c) lifting the foot part of the strand section from the roller table by means of a lifting device, whereby the foot of the strand section is pulled away in the transport direction of the scissors;
4. d) cutting the material passing through the scissors into a starting material section by means of the scissors;
5. e) conveying the Vormaterialabschnitts from the roller table through a discharge, and removing the strand section until the restoration of operational readiness of the cast-rolling composite system.

Immediately after a malfunction has occurred in a plant part located behind the means for cutting and discharging (for example, the one- or multi-stand finishing train), it is continuously produced by a continuous casting machine, for example, for thin slab or slab sections Pre-rolling pre-rolled material (typically steel) separated by the shear. Through this cut creates a strand section which extends from the scissors in the transport direction. Of the Strand section is clamped by a clamping device, which is arranged in the transport direction after the scissors, a lifting device and a Ausfördereinrichtung but before the finishing train, so that the foot of the strand section is pulled away by the immediate subsequent lifting of the foot part of the strand section of the scissors, ie in Transport direction is moved. By lifting the strand section not only the roller table, which is assigned to the discharge, freed, but the foot of the strand section moved in the transport direction. Thus, these steps cause the roller table to be cleared in the chopper and chopper, and the foot of the chunk section to be spaced from the still continuously produced stock. Thus, the casting operation of the continuous casting machine in a fault must not be interrupted. The further produced starting material is then cut by the shear on Vormaterialabschnitte, so that these Vormaterialabschnitte be discharged and optionally fed to a recovery in a hot rolling mill. Finally, the raised strand section must be removed until the operational readiness of the cast-rolling composite plant is restored.

In order to ensure a reliable clamping even with an oily or greasy surface of the strand section, it is advantageous if, during clamping, at least one pair of opposing strand guide rollers is pressed against the strand section by an actuating device.

It is advantageous if the lifting of the foot part of the strand section by a, typically horizontal lifting bar in the vertical direction. As a result, the underlying roller table is cleared quickly. Here, the lifting beam in the raised state, for example, extend in the horizontal direction or in an oblique direction.

In order to enable utilization of the continuously produced primary material in conventional hot rolling mills, it is advantageous if the shears cut the precursor material passing through the shears to primary material sections with a length of 8 to 14 m. Alternatively, it is possible that the scissors produced so-called scrap pieces with a length of typically about 1 m.

It is expedient if, during the conveying out, the starting material section is pushed off the roller table transversely to the transport direction (for example in the horizontal direction). As a result, the space next to the roller table is effectively used for temporarily storing the Vormaterialabschnitte, for example by a stacker.

In addition, it is expedient to lift the strand section during removal by a crane in the vertical direction.

Said object is also achieved by a cast-rolling composite system of the type mentioned, in which the means for cutting and conveying additionally comprises a clamping device for clamping the strand section, wherein the clamping device of the lifting device is downstream in the transport direction. By the clamping device ensures that the foot of the strand section is automatically pulled away by lifting the strand section of the scissors. This prevents a collision between the incoming starting material and the strand section.

Preferably, the scissors is a pendulum scissors or a drum shears.

It is expedient if the clamping device comprises an actuating device and in a plane normal to the transport direction two strand guide rollers, wherein the strand guide rollers can be pressed by the actuating device to the strand section. Here are the Strand guide rollers pressed on the actuator to the strand section, so that is clamped on the frictional engagement between the strand guide rollers and the strand section of the strand section.

The actuator is particularly robust when it is designed as a hydraulic cylinder. In addition, in a hydraulic cylinder, the clamping force can be easily adjusted and limited by the hydraulic pressure.

In a simple and functional lifting device, the lifting device comprises at least one lifting cylinder and at least one lifting beam oriented transversely to the transport direction, wherein the lifting beam can be lifted by the lifting cylinder in the vertical direction and lowered again.

In a simple and functional discharge device, the discharge device comprises at least one stripping cylinder, whereby a starting material section can be pushed off the roller table by the stripping cylinder transversely to the transport direction (for example in the horizontal direction).

In a particularly compact device for cutting and discharging, a lifting device between two discharge devices or a discharge device between two lifting devices is arranged in the transport direction. For example, a lifting device and / or a discharge device is arranged between two roller conveyor rollers following in the direction of transport. As a result, the starting material is sufficiently supported on the roller table, and the lifting device and / or the Ausfördereinrichtung is extremely compact integrated into the roller table.

Due to the spatial entanglement of the discharge device and the lifting device, the overall structural length of the device for cutting and discharging is greatly reduced.

However, this also reduces the investment costs and the operating costs, since the starting material cools less strongly (and therefore less heat must be re-heated by a subsequent heating). Furthermore, this results in less scale on the belt, so that the belt must be less descaled, which in turn cools the belt less. It also improves the quality.

Alternatively or in addition to the spatial entanglement, it is advantageous if the lifting device in the lowered state and the discharge device are arranged in a single region of a roller table between the scissors and the clamping device.

Brief description of the drawings

• Fig 1 eine schematische Darstellung einer Gieß-Walz-Verbundanlage für den vollkontinuierlichen Endlosbetrieb
• Fig 2 eine schematische Darstellung einer Einrichtung zum Zerteilen und Ausfördern nach dem Stand der Technik
• Fig 3a und 3b ein Aufriss und ein Grundriss in schematischer Darstellung einer ersten Ausführungsform der erfindungsgemäßen Einrichtung zum Zerteilen und Ausfördern
• Fig 4a...4f eine schematische Darstellung der Schritte in der Einrichtung zum Zerteilen und Ausfördern zur Überbrückung einer Produktionsunterbrechung
• Fig 5a und 5b ein Aufriss und ein Grundriss in schematischer Darstellung einer zweiten Ausführungsform der erfindungsgemäßen Einrichtung zum Zerteilen und Ausfördern Beschreibung der Ausführungsformen

Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, reference being made to the following figures, which show the following:

• Fig. 1 a schematic representation of a casting-rolling composite plant for fully continuous endless operation
• Fig. 2 a schematic representation of a device for cutting and Ausfördern according to the prior art
• FIGS. 3a and 3b an elevation and a plan view in a schematic representation of a first embodiment of the device according to the invention for cutting and Ausfördern
• Fig. 4a ... 4f a schematic representation of the steps in the device for cutting and discharging to bridge a production interruption
• FIGS. 5a and 5b an elevation and a plan view in a schematic representation of a second embodiment of the device according to the invention for cutting and Ausfördern Description of the embodiments

Fig. 1 shows one from the WO 2009/121678 A1 1. In normal operation, a continuous casting machine 2 continuously produces a starting material 3 in the form of a thin slab strand, which is transported via a roller table 4 to a rough rolling mill 5. After rough rolling in the rough rolling mill 5, the starting material 3 passes through uncut, ie as a strand, a means for cutting and conveying 6 before the temperature of the starting material is set in a heating section 12 to rolling temperature. After the treatment of the starting material in a descaling plant 13, which is upstream of a finishing train 14, the descaled starting material is rolled in the single or multi-stand finishing train 14. The finished rolled material is then cooled in a cooling section 15, cut by a pair of scissors 16 to a certain product length or a certain product weight and then wound up by a storage device 17 designed as a take-up device. The roller table 4 connects all parts of the plant between the horizontal strand guide of the continuous casting machine 2 and the storage device 17th

In Fig. 2 is the device for cutting and conveying 6 of Fig. 1 shown comprising a first scissors 9a, a discharge device 8, a second scissors 9b, a lowerable roller table 18 and a lifting device 11. Immediately after the occurrence of a malfunction in a plant part downstream of the device for cutting and discharging 6 (eg the finishing train 14 or the winding device 17), the starting material 3 is severed by the second scissors 9b, whereby a strand section 21 is formed behind the second scissors 9b. In order to separate the strand section 21 from the further continuously produced, coming from the roughing mill 5, Vormaterial 3, the strand portion 21 of a Lifting device 11 is raised. The second material 9b passing through the starting material 3 is divided by the scissors 9b on scrap pieces 19, which are conveyed out via a lowerable roller table 18. Since the scrap pieces 19 are generally difficult to exploit, after the occurrence of the disturbance, the starting material 3 is cut off by a first pair of scissors 9a to precursor material portions 10, each having a length of 8-14 m, the preliminary material portions 10 being transversely across the outfeed unit 8 are transported to the transport direction 7 from the roller table 4. A disadvantage of the device for cutting and Ausfördern 6 according to the prior art is that the length of the device 6 is about 16 m, relatively cools the starting material 3 in continuous operation due to the residence time of the starting material 3 in the device 6th a relatively strong scaling is formed, and that the investment and operating costs of the device for cutting and Ausfördern 6 and the cast-rolling composite system 1 are relatively high.

The FIGS. 3a and 3b show a first embodiment of the device according to the invention for cutting and Ausfördern 6, the disadvantages of the solution after Fig. 2 no longer has. Apart from the shorter overall length of the device 6, the device 6 according to the invention can also with the known casting-rolling compound 1 of Fig. 1 be used. Specifically, the device for cutting and conveying 6 only only a pair of scissors 9, which is designed either as pendulum scissors or as a drum shears. On the scissors 9 follow in the transport direction 7 two discharge devices 8, between which a lifting device 11 is arranged in the transport direction. The lifting device 11 is in the Fig. 3a, 3b pulled through in the lowered position and shown in dashed lines in the raised position. After the rear discharge device 8, a clamping device 23 is arranged, which is designed as a pair of pinch rolls with which the strand section 21 or the starting material 3 can be clamped. This will prevents the strand portion 21 is moved by lifting against the transport direction 7. By clamping, the foot of the strand section 21 shifts in the transport direction 7, so that the subsequent starting material 3 has a sufficient distance from the strand section 21.

The process steps in the device for cutting and discharging 6 after the occurrence of a fault are in the Fig. 4a ... 4f shown. Shortly after the occurrence of a malfunction in a plant part downstream of the means for cutting and discharging 6, the endlessly produced starting material 3 coming from the roughing train 5 is cut off by the scissors 9, which is designed as pendulum scissors (the Fig. 4a shows the situation before the cut). By cutting a strand portion 21 is formed, which extends from the scissors in the transport direction 7. After the occurrence of the disturbance or before raising the strand section 21 by the lifting device 11, the strand section is clamped by the clamping device 23, so that the foot of the strand section 21 is not pulled by the lifting against the transport direction 7 (the 4b shows the situation immediately before clamping the strand section 21). In Fig. 4c the clamped strand portion 21 is lifted by the lifting device 11 in the vertical direction, so that the strand portion 21 has a vertical offset to the incoming material 3 and the foot of the strand portion 21 is pulled away by the lifting in the transport direction 7 of the scissors 9. Thus, the foot of the strand section 21 to the cutting plane of the scissors 9 has a vertical and a horizontal offset. The Fig. 4d shows that of the roughing train 5 continuously feedstock 3, which is supported by the roller table 4. After the head of the starting material 3 has a certain distance (for example, 10 m) to the scissors 9, the scissors 9 cuts from the starting material 3 a Vormaterialabschnitt 10 from. Immediately after cutting, the starting material section 10 is accelerated by at least one driven roller 20 in the transport direction, so that the starting material section 10 has a horizontal distance to the scissors 9 ( 4e shows the situation when accelerating). Finally, the primary material section 10 is pushed out of the drawing plane by the two discharge devices 8 before and after the lifting device 11, so that the roller table 4 is cleared between the two discharge devices 8. After the fault has been remedied, the strand section 21 is removed, for example, by a crane 22.

The FIGS. 5a and 5b show a second embodiment according to the invention of the means for cutting and Ausfördern 6, which also with the cast-rolling compound 1 after Fig. 1 can be used. The difference from the first embodiment is that after the scissors 9 in the transport direction, a front lifting device 11, a discharge device 8, a rear lifting device 11 and the clamping device 23 are arranged. As in the FIGS. 3a, 3b a strand section can be lifted by the two lifting devices 11. The subsequent starting material 3 is cut by the scissors 9 again to Vormaterialabschnitten 10, which can be deported by the Abschubzylinder 25 of the Ausfördereinrichtung 8 from the rollers 20 of the roller table 4 in the horizontal direction on the storage arms 29 of a stacking device 26.

In the first and second embodiments of the invention, a Vormaterialabschnitt 10 is viewed in elevation deported from the discharge device 8 of the drawing level out. Of course, it would also be possible to modify the discharge device 8 in such a way that a starting material section 10 is conveyed out into the plane of the drawing. A device suitable for this purpose is known from WO 2009/121678 A1 known.

Although the invention has been illustrated and described in detail by the preferred embodiments, thus, the invention is not limited by the examples disclosed, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1

Casting and rolling plant

2

continuous casting

3

Raw material

4

roller table

5

roughing

6

Device for cutting and conveying

7

transport direction

8th

unloading device

9,9a, 9b

scissors

10

Vormaterialabschnitt

11

lifter

12

heating section

13

descaling

14

Finishing mill

15

cooling section

16

scissors

17

memory device

18

lowerable roller table

19

scrap piece

20

role

21

strand section

22

crane

23

clamper

24

lifting cylinder

25

Abschubzylinder

26

stacker

27

walking beam

28

actuator

29

stacking arm

Claims (14)

1. Method for manufacturing hot-rolled products in a continuous casting-rolling installation (1), wherein in endless operation a strand with slab or thin-slab cross-section of an endless continuously-cast preliminary material (3), after its complete solidification, passes uncut through a cutting up and delivery device (6) on a roller table (4) in a transport direction (7), the strand is subsequently hot-rolled in a finishing rolling train (14), then cooled down, cut and stored, characterised in that, for bridging an interruption in production in a part of the installation which is located downstream from the cutting up and delivery device (6), the following method steps are carried out in the cutting up and delivery device (6):

   a) Cutting off of the continuously produced preliminary material (3) into a strand portion (21) by a pair of shears (9);

   b) Clamping of the strand portion (21) by a clamping device (23);

   c) Raising of the tail part of the strand portion (21) from the roller table (4) by means of a raising device (11), whereby the tail of the strand portion (21) is pulled away from the shears (9) in the transport direction (7);

   d) Cutting of the preliminary material (3) passing the shears (9) to a preliminary material portion (10) by means of the shears (9);

   e) Delivery of the preliminary material portion (10) from the rolling table (4) by a delivery device (8), and removal of the strand portion (21) until the operational readiness of the combined casting-rolling installation (1) is restored.
2. Method according to claim 1, characterised in that, during clamping, a pair of opposing rollers (20) are pressed onto the strand portion (21) by an actuation device (28).
3. Method according to one of the preceding claims, characterised in that the tail part of the strand portion (21) is raised in the vertical direction by a raising bar (27).
4. Method according to one of the preceding claims, characterised in that during cutting, the shears (9) cut off the passing preliminary material (3) to preliminary material portions (21) with a length of 8 to 14 m.
5. Method according to one of the preceding claims, characterised in that during delivery, the preliminary material portion (21) is pushed away transverse to the transport direction (7).
6. Method according to one of the preceding claims, characterised in that during removal, the strand portion (21) is lifted in a vertical direction by a crane (22).
7. Combined casting-rolling installation (1) for manufacturing of hot-rolled products, comprising

   - a continuous casting machine (2) for continuous casting of a strand with slab or thin-slab cross-section of an endless preliminary material (3); then

   - a cutting up and delivery device (6), having shears (9) for cutting the preliminary material (3) to form a strand portion (21) or a preliminary material portion (10), a raising device (11) for raising a tail part of the strand portion (21), and a delivery device (8) for delivering the preliminary material portion (10); then

   - a finishing rolling train (14); then

   - a cooling section (15); and then

   - a storage device (17),

   characterised in that
   the cutting up and delivery device (6) additionally comprises a clamping device (23) for clamping a strand portion (21), wherein the clamping device (23) of the raising device (11) is located downstream in the transport direction (7).
8. Installation according to claim 7, characterised in that the clamping device (23) comprises an actuation device (28) and two rollers (20) in a plane normal to the transport direction (7), wherein at least one roller (20) is able to be pressed onto the strand portion (21) by the actuation device (28).
9. Installation according to claim 8, characterised in that the actuation device (28) is a hydraulic cylinder.
10. Installation according to one of claims 7 to 9, characterised in that the raising device (11) comprises at least one raising cylinder (24) and at least one raising bar (27) aligned transverse to the transport direction (7), wherein the raising bar (27) can be raised and lowered again in the vertical direction by the raising cylinder (24).
11. Installation according to one of claims 7 to 10, characterised in that the delivery device (8) comprises at least one pushing cylinder (25), wherein the preliminary material portion (10) can be pushed by the pushing cylinder (25) transverse to the transport direction from the roller table (4).
12. Installation according to one of claims 7 to 11, characterised in that in transport direction (7) the raising device (11) is disposed between two delivery devices (8) or one delivery device (8) is disposed between two raising devices (11).
13. Installation according to one of claims 9 to 12, characterised in that the raising device (11) in the lowered state and the delivery device (8, 8a, 8b) is disposed in a single area of a roller table (4) between the shears (9) and the clamping device (23).
14. Installation according to one of claims 9 to 13, characterised in that a raising device (11) and/or a delivery device (8) are disposed between two subsequent rollers (20) in the transport direction (7).

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