Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
  • B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening strands
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
  • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
  • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/14—Plants for continuous casting
  • B22D11/147—Multi-strand plants

Definitions

• the invention relates to a multi-strand continuous casting for the production of metal strands with billet or billet cross section with a strand guide comprising a directional zone equipped with fürrichtaggregaten, wherein a plurality of strand delivery in succession arranged Adjustrichtaggregate in a common scaffold with comb-like stanchions formed in the uprights receiving openings are arranged and each Desrichtaggregat a pair of rollers with an outer-bow roller and a relative movable inner-bow roller in associated roller carriage and a adjusting device for one of the two rollers, and optionally a rotary drive for one of the rollers comprises.
• Attenuation units are used in single- or multi-strand continuous casting plants, in particular continuous casting plants for the production of steel strands with different strand cross-section formats, to bend straight an arcuate strand guiding zone, continuously solidifying metal strand in the transition region to the horizontal outlet roller table straight and by a defined with respect to the pullout speed uniform transport to ensure the strand guidance.
• Greatering units can also be used to carry out a so-called soft reduction, whereby an improvement of the microstructure is achieved by this strand deformation in the final solidification region just before the sump tip.
• Drive rectifying 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 adjusting cylinder to the strand. This role is mostly with one Rotary drive connected.
• 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 machine with individual drive-straightening units in this arrangement is already known from WO 03/070399 A1, DE 10 2004 057 427 A1 or DE 22 39 966 A1.
• Abrasive power units of the generic type are designed for the joint straightening of several steel strands conveyed side by side with billet or billet cross section, are already known from DE 30 34 444 A1.
• a plurality of drive-straightening units are arranged in a common support frame.
• This support frame has bow inside open chambers in which the rollers of the drive unit are mounted with their chocks.
• the chocks or bearing housing of the adjustable rollers are hinged to hydraulic cylinders, which in turn are supported on the support frame.
• a straightening roller stand 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 by bearing housings on a cross member, which cooperates with the comb-like guides.
• Each cross member is adjustable by two pressure medium cylinder to the cast strand. Also in this case, it is necessary for disassembly of the driving straightening unit to release the cross member of the pressure medium cylinders, wherein the pressure medium cylinder can remain in the system.
• Object of the present invention is therefore to avoid the disadvantages of the prior art and to propose a multi-strand continuous casting with a straightening zone, which is characterized by low maintenance requirements, as well as easy assembly and disassembly at a case necessary reel change.
• each driving straightening unit comprises a crosshead
• propulsion unit 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 also with the adjusting device for the driven inner arc roller, from the support framework common to several propulsion aggregates.
• the roller carriage of the outer-bow roller and the roller carriage of the inner-bow roller are articulated on the crosshead, wherein the roller carriage of the inner-bow roller is articulated in a distance-variable manner to the roller carriage of the outer bow roller.
• This articulation is preferably carried out with support tabs, which allow a relative movement of the two roller carriages to each other.
• 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 fixed the crosshead to the uprights and on the other hand, the roller carriage of the outer arch roller can be supported and secured in the ground area on support brackets in the receiving opening of the scaffold formed by the uprights.
• 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 through the continuous casting.
• each support frame is assigned a media supply system for the supply of arranged in this scaffold fürrichtaggregate and the individualmaschinerichtaggregate can be coupled by automatic dome devices when inserting the fürrichtaggregate in the receiving opening with the media supply system.
• Media supply lines are guided on the scaffolds to the individualmaschinerichtaggregaten, which open in the bottom region of the respective receiving opening to support brackets in a coupling half of a multi-coupling.
• the further coupling half of the multi-coupling is arranged.
• the adjusting device acts centrally 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 and pivotally or hingedly attached to the roller carriage of the inner-bow roller.
• the inner-bow rollers are driven in the straightening zone of a continuous casting machine.
• the rotary drive for the inner-bow roller directly on the drive rectifying unit, preferably on the roller carriage of the inner-bow roller, supported and connected via an angular gear with the inner-bow roller.
• the support of the rotary drive via a torque arm.
• the transmission is preferably designed as an angle gear.
• the straightening zone for each cast strand of the multi-strand continuous casting plant is formed by a plurality of support stands arranged one behind the other.
• the adjusting device for the engageable inner-bow roller of each drive rectifying unit is designed individually controllable and adjustable.
• a hitch usually a hydraulically actuated pressure cylinder is used.
• the adjusting device of this type comprises a pressure cylinder, a control block and a tracking system.
• the control block is connected by control technology via a data line with the system control device.
• the tracking system such as a position sensor
• the engageable inner bow roller is set at the start of casting on the thickness of the Anfahrstranges and the subsequent hot strand.
• the setting of the deformation wedge ie the gradual roll-to-roll reduction in a soft reduction, is achieved by activating the setting device as a function of the position signal of the tracking system.
• calibration strips are arranged on the roller carriage of the inner-bow roller and on the roller carriage of the outer-bow roller.
• the two roller carriages can be moved towards each other until the roller carriage of the inner-bow roller bears against the roller carriages of the outer-bow roller via the calibrating bars. This position determines a reference distance for the strand thickness adjustment to be made.
• 1 a is a longitudinal section through a straightening zone of a continuous casting plant with drive-straightening units according to the invention
• 1 b is a longitudinal section through a straightening zone of a continuous casting plant with drive straightening units according to the invention in a further view
• Fig. 2a shows a cross section through the straightening zone of a multi-strand continuous casting
• FIG. 3 is a perspective view of amaschinerichtaggregat according to the invention, showing essential components of the invention Surichtaggregates.
• 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 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 supporting frameworks 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.
• an arcuate the straightening zone upstream strand guide continuous steel strand 6 is directed straight inmaschinerichtaggregaten 7 and possibly also subjected to a soft-reduction in these scaffolds.
• each casting strand is assigned an independent supporting framework 3a, 3b, whereby either one or two of these supporting frameworks are supported on a supporting frame 2d.
• the scaffolds 3a, 3b are formed as a frame construction, wherein a series of comb-like uprights 8 protrude from this scaffold and form between them receiving openings 9, are inserted into the individual propulsion units 7. Each four arranged in a square stanchion form such a receiving opening.
• Each scaffold is designed to receive a plurality of propulsion units arranged one behind the other in the direction of transport of the strand, wherein the scaffold 3a receives three propulsion aggregates 7 and the scaffold 3b receives four propulsion units 7.
• Each of these Examrichtaggregate 7 forms a self-contained unit that can be installed or removed as a whole.
• Each propulsion unit has a crosshead 1 1, which forms a support frame for all components of the propulsion unit.
• the crosshead 1 1 is releasably secured to four uprights, together a receiving opening 9 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 pressure cylinder 13a, is pivotally supported with pivot pin 14 in the crosshead 1 1.
• a roller carriage 16 is pivotally connected to a pivot pin 17.
• the inner-bow roller 18 is in support bearings rotatably supported.
• the roller carriage 16 is guided with its guide grooves 19a on radially oriented guides 19, usually on interchangeable guide rails, in the curved support frame 3a in the radial direction and in the horizontal expiring straight support frames 3b in the vertical direction.
• roller carriage 16 of the inner-bow roller 18 of the roller carriage 20 of the outer-bow roller 21 is articulated, which can be releasably secured with fastening elements on a bottom plate 23 in the receiving opening 9.
• a small relative mobility of the roller carriage 16, 20 is sufficient, which compensates for small differences in distance due to production and avoids assembly-related tension in the drive-bearing unit.
• support bolts 17 are guided on roller carriage 16 of the inner-bow roller 18 in non-illustrated slots on support plates 26, as well as the roller carriage 20 of the outer-bow roller 21 .
• the roller carriage 20 is also radially on the guides 19 of the uprights 8 with guide grooves 19a or vertically guided.
• the inner-bow roller 18 and the outer-bow roller 21 of a drive-straightening unit form a cooperating pair of rollers.
• the adjusting device 13 acts centrally on the engageable inner-bow roller 18 via the roller carriage 16. Specifically, in the formation of the adjusting device as a pressure cylinder 13a this is aligned in the direction of the longitudinal extent of the comb-like receiving opening 9, so that the line of action of the applied force, the axis of rotation of the inner-bow roller 18 intersects (is not shown in detail).
• the roller carriage 16 of the inner-bow roller 18 and the inner-bow roller 18 can be moved relative to the outer-bow roller 21 and thus employed to the continuous casting 6 continuous steel strand with a predetermined or regulated contact pressure, the straightening or ensures a predetermined reduction in thickness (soft reduction or other metallurgical treatment).
• the adjusting device 13 or the pressure-medium cylinder 13a is assigned a control block 27 and a track-following system 28.
• a tracking system for example, encoders are provided which detect the position of the piston of the pressure medium cylinder.
• Kalibrierangn 30 on the two roller carriages 16, 20 are provided.
• the inner-bow rollers 18 of the individual drive-straightening units 7 are predominantly 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 driven 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 roller 18a via a gear 32 preferably designed as an angular gear.
• each support frame 3a, 3b arranged for each strand a common media supply system 33 for all in the respective scaffold Greater 7 assigned.
• media such as cooling water, lubricant, compressed air, hydraulic oil, electricity, control and regulating signals
• each support frame 3a, 3b arranged for each strand a common media supply system 33 for all in the respective scaffold Greater 7 assigned.
• 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.
• a coupling half of this designed as a multi-coupling coupling device 34 is attached to the bottom plate and the second coupling half is attached to the roller carriage 20 of the outer bow roller 21.
• FIG. 3 shows the essential components of a driving straightening unit in an oblique view, as it can essentially be installed as an assembly from the arcuate or straight support frame or can be removed from it.
• the registered reference numbers refer to the above description with reference to FIGS. 1a to 2b.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)

Priority Applications (2)

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Publications (1)

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Cited By (8)

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Citations (8)

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• 2008
  • 2008-05-26 AT AT8332008A patent/AT506824B1/de not_active IP Right Cessation
• 2009
  • 2009-04-28 EP EP09753762.5A patent/EP2285512B1/de active Active
  • 2009-04-28 CN CN200980119378.0A patent/CN102066022B/zh active Active
  • 2009-04-28 KR KR1020107029302A patent/KR101622100B1/ko not_active IP Right Cessation
  • 2009-04-28 WO PCT/EP2009/055096 patent/WO2009144107A1/de active Application Filing

Patent Citations (8)

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