AT506824A1 - MORE STRAND CASTING - Google Patents

Description

May 26th, 2008 8:12 am

Siemens CIC P ···· ·· «• · · · · · · · · · · · ·

No. 0283 p. 5/22 ··

2006P23830AT

i-stfanmlgfianlflgaL

Technical area

The invention relates to a multi-strand continuous casting for the production of metal strands with KnQppei- or pre-block cross-section with a strand guide comprising a directional zone equipped with Treibrichtaggregaten, wherein a plurality of Strangförderriohtung successively arranged Treibrichtaggregate in a common StQtzgerüst with comb-like stanchions in receiving openings formed between the uprights are arranged and each Treibriohtaggregat a pair of rollers with an outer-bow roller and a reiativbewegiiohen inner-bow roller in associated Roilenschlitten and a adjusting device for one of the two rollers, and optionally a rotary drive for one of the rollers comprises.

Greatering units are used in a single or multi-strand continuous casting plant, especially in continuous casting plants for the production of steel strands with different strand cross sections, to bend straight the arcuate strand guiding zone continuous, solidifying metal strand in the transitional area to the horizontal outlet roller table again and by a hinsichtlioh the extraction speed defined uniform transport the strand guide safely to steep. Trelbrtchtaggregste can also be used to carry out a so-called soft Reductlon, which is achieved by this strand deformation in Enderstarrungsbereich just before the sump tip an improvement in the microstructure.

State of the art

Drive set units usually comprise a pair of rollers, which is supported in a scaffolding frame. A role of the pair of rollers, preferably the role of the bow inner side roller stand Is adapted to adapt to changing strand thickness in the frame relative to the other role and is pressed by a hydraulic Anstellzylfnder to the strand. This role is usually 26/05 2008 MO 08:10 [SE / EM NR 7334] @ 005 26 May 2008 8: 1 2

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No. 0283 p. 6/22

Rotary drive connected. Several of these propulsion units are mounted one behind the other in the strand conveying direction on a common support frame and form the straightening zone in the continuous casting plant. A continuous casting plant with individual Trelbrtchtaggregaten in this arrangement is already known from WO 03/070399 A1, DE 10 2004 057 427 A1 or DE 22 39 966 Ai.

Abrasive power units of the generic type, however, are designed for the joint straightening of several steel strands conveyed side by side with billet or Vorblockquerechnltt are already known from DE 30 34 444 A1. A plurality of drive-straightening units, each formed by a pair of rollers, are arranged in a common support frame. This support frame has bogenlnnenseitig open chambers in which the rollers of the drive unit are mounted with their mounting blocks, the chocks or bearing housing of attachable rollers are hinged to hydraulic cylinders, which in turn are supported on the support frame. When changing the drive unit, it comes to a high installation effort, since it is necessary to solve the hydraulic cylinder from its anchorage in the Treggerüst and also to solve the corresponding supply lines, such as Druckmittelanechlüsse.

From DE 27 31 748 A1 a Richtroltengerüet is also known in which a plurality of successive pairs of rollers are arranged in a comb-like arranged guides a machine stand. The individual rollers are supported upper bearing housing on a cross member, which cooperates with the comb-like guides. Each cross member is adjustable by two pressure cylinder to the cast 8trang. Also in this case, it is necessary for disassembly of the driving straightening unit to release the cross member of the pressure medium cylinder, the Druckmitteizyfinder can remain in the system.

Presentation of the invention

Object of the present invention is therefore to avoid the disadvantages of the prior art and a multi-strand continuous casting with a straightening zone estimates, which is characterized by low maintenance, as well as easy assembly and disassembly in a feilweise necessary Rolienweohsel.

This task is achieved on the basis of rather multi-strand continuous casting of the type mentioned above, in that each drive-train unit comprises a cross-head which is 26/05 2008 MO 08:10 [SE / EM NR 7334] @ 006 26 May 2008 8:12

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No. 0283 p. 7/22 ···· ·························································

Is releasably connected to the receptacle opening for the Treibrichtaggregat forming that is hinged to the crosshead the Anstelivorrichtung for engageable inner bow roller that each role of Roflanpaares is supported in a roller carriage and the roller carriage of the inner bow roller slidably on guides of the uprights is guided and that the roller carriage of the inner-bow roller is connected to the adjusting device. Due to this particular configuration of the individual components of the propulsion unit, it is possible to remove or reinsert the entire propulsion unit with the release of a few fastening elements as a modular component, in particular with the Anstelivorrichtung for the driven inner arc roller from the common for several propulsion aggregates scaffold.

The roller carriage of the outer-bow roller and the Rollenschlltten the inner-bow roller are angeienkt on the crosshead, wherein the Rollenschlltten the inner-bow Rolie distance adjustable articulated to the roller carriage of the outer-bow roller. This articulation is preferably carried out with carrier bags, which allow a Reiativbewegung the two Rollenschlltten each other. Thus, the joint installation and removal is easily possible and it can be compensated structural deviations on the skeleton and especially on the scaffold of the propulsion unit. It is thus achieved that on the one hand fixes the crosshead to the uprights and on the other hand, the Rollenschlltten the Außenbogsn-RoKe in the receiving opening formed by the stanchion the Stützgerüetes in the bottom area supported on support brackets and can be secured. The outer-bow rollers form here, as in the entire strand guide framework, the fixed side of the strand guide, on which the cast metal strand is supported on its transport path through the continuous casting.

The media supply for the individual propulsion units In the straightening zone can be much simpler by each support scaffold is assigned a media supply system for supplying the support structure arranged in this support gensets and the individual Treibrichtaggregate can be coupled by automatic Kuppelelnrichtungen when inserting the Treibrichtaggregate in the Aufnahmeöffhung with the Medlenversorgungssystem. Media supply lines are routed to the StQtzgerüeten the individual Treibrichtaggregaten, which open in the bottom region of the respective receiving opening to support brackets in a Kuppiungshfilfte a Muffikupplung. On Rofleneohlftten the outer bow roller, the further coupling half of the Muitikupplung is arranged. Belm Placing the respective roll shed of the outer bow roll on the support bracket Automatically the 26/05 2008 MO 08:10 [SE / EM NR 7334] 1007

Mulli grouping for monkey needed media closed. It can also be arranged several automatic quick couplings for different media next to each other. If necessary, coolant, lubricant, hydraulic oil, electricity, compressed air and other necessary media can be looped through this multicoupling; furthermore, individual media-blown-up lines are routed to the respective components of the drive-aligning unit.

So that a level contact of the inner-bow roller is securely ensured on the metal strand and tilting forces are avoided, it is expedient that the adjusting device centrally acts on a engageable inner-bow roller of the driving direction, is arranged in the direction of the longitudinal extension of the comb-like receiving opening and pivotable on the crosshead or articulated supported and pivotally or hingedly attached to Rollenschfltten the inner sheet roll is.

In most cases, the inner bow rollers are designed to be driven in the straightening zone of a continuous casting machine. To ensure a compact design and easy assembly and disassembly of the Treibrichtaggregatee, it is advantageous if the Drehantrfeb for the inner-bow roller directly on Treibriohtaggregat, preferably on the roller carriage is inner bow roller, supported and connected via an angular gear with the inner-bow roller. Preferably, the support of the rotary drive via a torque arm. The transmission is preferably ausgeblldet as angular gear

Further, it is expedient if, in the case of a multi-strand continuous casting layer, individual casting strands, which are independent of each other, are assigned scaffolds which are independent of each other and independent deadweight aggregates in the directional zone. Mutual influences, as they occur especially in the case of propulsion units according to DE 30 34 444 A1, can thus be avoided.

Bel straightening zones of great length is the straightening zone for each casting strand of Mehretrang continuous casting of several stacked support structures formed.

Especially for the implementation of a soft reduction In the straightening zone and the necessary differentiated setting of a deformation cone, it is necessary that the adjusting device for the engageable inner-bow roller each Treibrichtaggregatee is individually controlled and adjustable ausgelldet. 26/05 2008 MO 08:10 [SE / EM NR 7334] @ 008 26 May 2008 8: 1 2

No. 0283 p. 9/22

Siemens CIC P. ··. ··.: ....... ........: ::: ···. , ·····. ···· * ··· * j »· '.. 6

As a hitch usually a hydraulically actuated pressure cylinder is used. The adjusting device of this type comprises a pressure cylinder, a control block and Wegungsfoigungssyetem. The control block is connected by control technology via a data line with the plant control device. With the tracking system. e.g. a position sensor, the engageable inner arc RoKe is set at the start of casting on the thickness of the dummy bar and the subsequent hot strand. Also, the setting of the deformation wedge, ie. the step-by-step roll-to-roll reduction in a soft reduction is achieved by activating the starting device in response to the position signal from the tracking system.

To calibrate Wegverfölgungssystems Kattbrierleisten are arranged on Rollenschtttten the inner sheet roll and on the roller slide of the outer roll. The two roller carriages can be moved toward each other until the roller carriage of the inner-bow Roile rests on the calibration strips on Rollenschtttten the outer bow roller. This position determines a reference interval for the strand thickness adjustment to be made.

Kuizbeschrelbung of the drawings

The advantages and features of the present invention will become more apparent from the following description of a non-limiting example, reference being made to the attached figures which show:

1a shows a longitudinal section through a straightening zone of a continuous casting plant with drive-straightening units according to the invention,

1b shows a longitudinal section through a straightening zone of a continuous casting machine with drive-straightening units according to the invention in a weathered view,

2a shows a cross section through the straightening zone of a multi-strand continuous casting with Treibrichtaggregaten according to the invention along the section line A-A in Fig. 1a,

2b shows a cross section through the straightening zone of a multi-strand extrusion line with drive-straightening units according to the invention along the section line AA in FIG. 2a, 26/05 2008 MO 08:10 [SE / EM NR 7334] @ 009 26. Maί 2008 8: 1 2

Siemens CIC P ···· äset • • • • • • • • • • • • • • • • • • • • • • • • · · · · · · · · · · · · · · · · · · · · · · · · 6

No. 0283 p. 10/22

3 is a perspective view of a propulsion unit according to the invention, showing essential components of the propulsion unit according to the invention,

Embodiment of the invention

In FIGS. 1 a, 1 b and 2 a, 2 b, the straightening zone of a six-stranded multi-strand continuous casting plant is schematically illustrated in a longitudinal section and in a cross section in two representations in each case. On a plant foundation 1 are on supporting frame 2 a, 2 b, 2 c, 2 d two StQtzgerüste 3 a, 3 b releasably secured with clamping screws. The support frame 3a is arcuate and the support frame 3b is straight. Together they form the straightening zone 5 of the continuous casting plant. Together in this Stützgerüeten a one arcuate, the straightening zone upstream strand guide continuous Stahistrang 6 straightened in Treibrichtaggregaten 7 and possibly also subjected to a soft-reduction. As can be seen from FIG. 2, each casting strand is assigned an independent support frame 3a, 3b, wherein either one or two of these support frames are supported on a support frame 2d.

The scaffolds 3a, 3b are designed as a frame construction, wherein a series of comb-like rounded uprights 8 project from this scaffold and form receiving openings Θ between them, into which individual trellising aggregates 7 are inserted. Each four arranged in a square stanchion form one such receiving opening. Each scaffold is auegeblldet for receiving a plurality of in the strand transport direction successively arranged Treibrichtaggregaten, wherein the supporting frame 3 a three Treibrichtaggregate 7 and the supporting frame 3 b receives four Trelbragtegregate 7. Each of these Treibrichtaggregate 7 forms a self-contained unit that can be integrated as a whole or expanded.

The Treibrichtaggregat is shown in more detail in the figure. Jodes Treibrichtaggregat has a crosshead 11, which forms a support frame for all components of the propulsion unit. The crosshead 11 is releasably secured to four uprising, together a receiving opening Θ limiting stators 8 at the upper ends with connecting bolts 12 or with another fastener. An adjusting device 13, which is formed by a controllable Druckmitteizylinder 13a, is supported by Schwenkboizen 14 in the crosshead 11 achwenkbeweglich. On the piston rod 15 of the Druckmittelzyllnders 13a is a Rollenschiltten 16 pivotally connected to a pivot pin 17. On the roller chute 16 Is the inner-bow Roile 18 in support bearings 26/05 2008 MO 08:10 fSE / EM NR 73341 01010 26 May 2008 8: 1 3

Siemens CIC P

No. 0283 8. 1 1/22 t ·· rotatably supported. Dar Roilenschlltten 16 Is guided with its guide grooves 19a on radially oriented guides 19, usually on interchangeable guide rails, in the curved StQtzgerüst 3a in the radial direction and in the horizontal expiring straight Stutzgerüsten 3b in the vertical direction displaceable.

Below the Rollenschllttens 16 of Innsnbogen roller 18 of the roller carriage 20 of the outer arch Roile 21 is articulated, which can be releasably secured with Befastigungeelementen on a bottom plate 23 in the receiving opening 9. In this case, a slight relative mobility of the roller carriage 16,20 is sufficient, which compensates for low separation-related Abstandeuntereohiede and assembly-related tension in the drive train unit avoids. For this purpose, support bolts 17 are guided on Rolienechlitten 16 of the inner bow Rolie 18 in Langlöchem not shown on carrying pockets 26, as well as the roller carriage 20 of the outer bow roller 21. The Roilenschlltten 20 is with guide grooves 19a also on the guides 19 of the uprights 8 radially The inner bow roller 18 and the outer bow roller 21 of a drive-straightening unit form a cooperating pair of rollers.

The AnsteHvorrichtung 13 acts on the engageable inner arc RoKe 18 via the Roilenschlltten 18 centrally. Specifically in the formation of Anetellvonichtung as a pressure cylinder 13a is this aligned in the direction of the longitudinal extent of the comb-like receiving opening 9, sodaes the line of action of the applied force the axis of rotation of the inner bow Rolie 18 cuts (is not shown in detail).

With the Anstellvorrlchtung 13 of the roller carriage 16 of the inner bow Rolie 18 and the inner bow Rolie 18 are moved relative to the outer arch Roile 21 and thus to the continuous casting the continuous steel strand 8 with a vorbestimmtan or regulated contact pressure be angestellf, the straightening or a predetermined reduction in thickness (soft reduction or other metallurgical treatment). In order to be able to position the inner sheet roll 18 to a predetermined strand thickness, the control device 13 or the pressure medium cylinder 13a is assigned a control block 27 and a tracking system 28. As a tracking system, for example, encoders are provided which detect the position of the piston of the pressure cylinder. For calibration of this tracking system 28 KaKbrierlelsten 30 are provided on the two Roilenschlltten 18,20. 26/05 2008 MO 08:10 [SE / EM NR 7334] ®011 May 26, 2008 8:13

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8th

No. 0283 p. 12/22

To ensure a constant Gießstrang TransportgeschwIndigkeU and to perform a soft-reduction, the inner-bow rollers 18 of the individual drive-straightening units 7 are mainly designed as driven rollers. Figure 1 shows powered inner-bow rollers 18a and non-driven inner-bow rollers 18b. The rotary drive 31 of the specified inner-bow roller 18a, which is formed by an electric motor, is fastened to the crosshead 11 and is connected to the drive shaft of the inner-bow Roife 18a via a gear 32 preferably designed as an angular gear.

To supply the individual Treibrichtaggregate with the necessary for the operation of operating media, such as Kühlwasssr, lubricant, compressed air, Hydraullköl, electricity, control and control signals, each support frame 3a, 3b for jaden strand a common media supply system 33 for all In the respective support frame arranged Greater 7 assigned. But there are also Telivereorgungssyeteme for special resources possible. Starting from a common supply line lead branch lines for each medium to a common coupling device 34 on the bottom plate 23 of the respective receiving opening of a drive rectifying unit. One coupling half of this multi-coupling coupling device 34 is attached to the bottom plate and the second coupling half is attached to the roller rail 20 of the outside arch tube 21. With the insertion of the roller Schläcken 20 in the receiving opening 9 and its attachment to the bottom plate 23 all media supply line are coupled together

FIG. 3 shows the essential components of a drive-straightening unit in a sloping manner, as it can essentially be installed as an assembly from the arcuate or straight support frame or can be removed from this. The reference numbers referenced refer to the above description with reference to FIGS. 1a to 2b. 2G / 05 2008 MO 08:10 [SE / EM NR 7334] @ 012 May 26, 2008 8: 1 3 Siemens CIC P ·· »··· · • • • • • ···· • ···· • • sss • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 9

No. 0283 '...... p. 13/22

Reference elements: I Plant foundation 2a, 2b, 2c, 2d Tragrahman 3a arcuate Stotzgerüst 3b straight Stützgerüet 4 clamping screws 5 straightening zone 6 steel strand 7 Treibrichtaggregat 8 comb-like uprights Ö receiving opening for propulsion unit II crosshead 12 connecting pin 13 Anetellvorrichtung 13a pressure cylinder 14 pivot pin 15 piston rod 16 roller carriage of the inner bow rollers 17th Pivot pin 18 inner bow roller 19 guides 19a guide groove 20 roller carriage of outer bow roller 21 outer bobbin 23 bottom plate 26 support plate 27 control block 28 path tracking system 30 calibration bar 31 rotary drive 32 gear 33 media supply system 34 coupling device R casting direction 26/05 2008 MO 08:10 [SE / EM NR 73341 01013

Claims (11)

May 26, 2008 8:13 S i emens CIC P # 0283 p. 14/22 ··· ♦ ··· • · 1 • · ♦♦ »» · i ► · · 4 > M * · + 10 Claims: 1. Multi-strand continuous casting plant for the production of Mötaiisträngen with billet or pre-block cross-section with a strand guide comprising a with Richtrichtaggregaten (7) equipped straightening zone (5), wherein a plurality of Strict feed in succession arranged Treibrichtaggregate (7) In a common StQtzgerÜst (3a, 3b) are arranged with comb-like 8tehem (8) formed in between the uprights receiving openings (8) and each drive set a pair of Roil with an outer bow roller (21) and a relative movable inner bow roller (18) in associated roller slides (16, 20) and an adjusting device (13) for one of the two rollers, and optionally a rotary drive (31) for one of the rollers, characterized in that each drive unit (7) comprises a crosshead (11) Is releasably connected to the one receiving opening (8) for the drive training unit forming stators (8) on the crosshead (11) the Anstellvorriohtung (13) for the engageable inner-bow roller (18) is hinged, that each role of the roller pair is supported in a Roilenschlltten (16, 20) and the roller carriage (16) of the inner-bow roller (16) 18) is slidably guided on guides (19) of the uprights (8) and that the roller carriage (16) of the inner-bow roller (18) is connected to the positioning device (13), 2. multi-strand extrusion line according to claim 1, characterized daaa the roller carriage (20) of the outer arc roller (21) and the roller carriage (16) of the inner-bow roller (18) is hinged to the crosshead (11), wherein the roller carriage ( 16) of the inner-bow roller (18) adjustable in distance to the roller carriage (20) of the outer-bow roller (21) is articulated on the crosshead (11). 3. multi-strand continuous casting plant according to claim 1 or 2, characterized in daaa the roller carriage (20) of the outer-bow roller (21) in the Stützgertist (3a, 3b) is fixed in position. ® ° 14 26/05 2008 MO 08:10 [SE / EM NR 7334] May 26, 2008 8:13 Siemens CIC P * ···· ················································································································································································ 4. Mehrstrang-Stranggiaßanlage according to any one of the preceding claims, characterized in that each support frame (3a, 3b) is assigned a Medienversorgungssyetem (33) for the supply of the support frame (3a, 3b) Treibiagtegregate (7) and the individual Treibrichtaggregate ( 7) by automatic Kuppeleinrtchtungen (34) kuppeibar when inserting the Treibrichtaggregate (7) in the AufnahmeÖfFnung (9) to this media supply system (33) 5. multi-strand continuous casting plant according to one of the preceding claims, characterized in that the AnsteSvorrlchtung (13) centrally acting on a anstelibare inner-bow roller (16) of the drive-directing unit (7), in the direction of the longitudinal extension of the comb-like receiving opening (9) is arranged and is pivotally or articulated supported on the crosshead (11) and on the roller carriage (18) of the inner-bow roller (18) pivotally or hingedly attached is. 6. multi-strand continuous casting machine according to one of the preceding claims, characterized in that the rotary drive (31) for the inner-bow roller (18) directly on the drive train unit (7), preferably on Roilenschlitten (16) of the inner-bow Roile (18) abgeatQtzt and via a transmission (32) with the inner-bow roller (18) is connected. 7. multi-strand continuous casting according to one of preceding claims, characterized in that individual casting strands (6) of the multi-strand continuous casting in the straightening zone (5) independent supporting frames (3a, 3b) and independent Trelbrlchtaggregate (7) are assigned. 8. multi-strand continuous casting plant according to one of the preceding claims, characterized in that the Riohtzone (6) for each Gleßstrang (6) of the multi-strand continuous casting of several consecutively arranged support structures (3a, 3b) is formed. 9. multi-strand continuous casting plant according to one of the preceding claims, characterized in that the AnsteSvorrlchtung (13) for the anateRbare inner-bow roller (18) of each drive rectifying unit (7) is individually controllable ausgeblldat Is. 26/05 2008 MO 08:10 [SE / EM NR 7334] @ 015 May 26, 2008 8:13 S i emens CIC P No. 0283 p. 16/22 12 10. multi-strand strand ing machine according to claim 9, characterized in that the adjusting device (13) comprises a pressure medium cylinder (13 a), a control block (27) and a tracking system (28) and the control block is preferably connected to the Anlagenleiteinrichtung via a Datonleitung. 11. multi-strand continuous casting according to claim 10, characterized in that the Roilenschlitlen (16) of the inner-bow Rolie (18) and the roller slide ¢ 20) of. Outer Bow Pulley (21) Calibration Bars (30) are arranged to calibrate the pathfinding system (28). 26/05 2008 MO 08:10 [SE / EM NR 7334] @ 016