CN1224640A - Method for controlled pre-rolling of thin slabs leaving continuous casting plant, and relative device - Google Patents
Method for controlled pre-rolling of thin slabs leaving continuous casting plant, and relative device Download PDFInfo
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- CN1224640A CN1224640A CN 98119190 CN98119190A CN1224640A CN 1224640 A CN1224640 A CN 1224640A CN 98119190 CN98119190 CN 98119190 CN 98119190 A CN98119190 A CN 98119190A CN 1224640 A CN1224640 A CN 1224640A
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Abstract
A method for controlled pre-rolling of thin slabs leaving continuous casting plant is provided, wherein the pre-rolling is performed by a plurality of pairs of rolls equiped on a pre-rolling assembly. A first pre-rolling assembly abuts against downstream of a foot roll. The pair of rolls have at least a roll capable of displacing, a pressure sensor, a hydraulic cavity mechanism and a position transducer which can cooperate with a data processing equipment together with the pressure sensor, and at least a first pair of rolls can produce plate blank of thin solidfying sheath of rigid open casting belt. The method can decrease thickness of slabs leaving the last pre-rolling roll of at least 10% to eliminate liquid phase core, contact the two phase regions, refine grain in center curing structure and minimize centerline segregation. A device for carrying out the method is further disclosed.
Description
The application submitted on April 25th, 1994, and name is called the dividing an application of No. 94104661.3 application of " method of the controlled pre-rolling of the sheet billet of leaving continuous casting plant and device ".
The present invention relates to the method and the device of controlled pre-rolling of the sheet billet of leaving continuous casting plant.Or rather, the present invention relates to leaving the thin sheet continuous casting mould, carry out the method for controlled pre-rolling and be applicable to the device of this method near the sheet billet in the bottom roller downstream of described mould.
So-called sheet billet is meant 800 to 2500mm wide (or wideer), 25 to 90mm thick slabs.The present invention preferably but the final thickness that not only is applicable to conticaster outlet is 30 to 60mm slab.The present invention also is applicable to the continuous casting of steel billets such as circle, side, rectangle.The present invention can be used for straight or crooked continuous casting installation for casting.
Pre-as everybody knows rolling method is that sheet billet is rolled bearing in advance away from a zone of bottom roller.
At JP-A-130759, US-A-3,891,025, US-A-4,056,140 and US-A-4,134, in 440 files such as grade in the method for disclosed prior art, be on the almost non-existent position of liquid phase core or liquid phase pond of slab, to carry out that the crust of slab is thicker owing to roll in advance, not yielding, so effect does not make the people satisfied.In addition, the crust of slab one side is to be connected in the opposite side crust by the cylindrical curing part on centre position between the edge, and two edges have consistent cured thickness, and cylindrical curing part has powerful resistance to changing slab thickness.Therefore, in the prior art this rolls in advance and has only inadequate and limited effect, can not obtain ideal results.In addition, in order to carry out inadequate shallow processing, and the real processing that reduces slab thickness depends on the rolling series that is positioned at the downstream by rolling in advance just of carrying out of the method for prior art.In addition, rolling in advance in the assembly of prior art, have only some rollers to being controlled to roll parameter in advance, and these rollers are to being the mode controlled (seeing JP-A-130759) to distinguish or separate to check.Consequently method of operating can not be according to the specific requirement adjustment, and is very accidental in some aspects.
People know that also rolling assembly in advance has the mechanical type Adjustment System, preset when foundry work begins.Among these assemblies and the continuous row or be divided into the pre-roll cooperating of roller group, perhaps also with press belt assembly cooperating.
These systems of prior art can not well adjust, and the substance that can not expect is rolled effect in advance, can not roll requirement in advance according to reality continuously and carry out continuous controlled stroke.These systems can not still exist obvious liquid phase core or liquid phase pond, and the zone that crust is thin processes.
Prior art has hindered in order to reducing the length of liquid phase awl, thereby guarantees the controlled mechanism than good quality.
In addition, prior art has significant limitation on the startup problem relevant with the transition state that stops, can not making system that the good production ability is arranged.Prior art can not be avoided flowing of when entry into service liquid material, and when stopping the flowing again of liquid metal, thereby make percent defective very high.
The applicant examines, checks and finished the present invention, thereby has overcome shortcoming of the prior art, and has very big advantage.
With the disclosed and EP-A-0 with this specification, disclosed rolling in the assembly in advance used in 539,784 according to pre-rolling method of the present invention, EP-A-0,539,784 corresponding to the Application No. of submitting on October 20th, 1,992 07/963,734, its technology contents is incorporated by reference in this manual.
The object of the present invention is to provide a kind of controlled pre-rolling method of sheet billet of leaving continuous casting plant, and a kind of device of the sheet billet of leaving continuous casting plant being implemented controlled pre-rolling.
Controlled pre-rolling method according to the sheet billet of leaving continuous casting plant of the present invention, wherein roll in advance be by at one or more many rollers of being provided with in the assembly of rolling in advance to carrying out, first rolls the downstream of assembly near the bottom roller of mold in advance, be provided with at least one movable roller roller centering, roller is to disposing pressure sensor and hydraulic cavities mechanism, be provided with position sensor, pressure sensor and position sensor and data processing equipment cooperating, at least the first roller just comes out from mold to processing, slab with thin curing crust, described method is characterised in that: described data processing equipment also with the monitoring tundish in the monitoring device of temperature of liquid pool, the speed monitoring device, and mold is just being left in monitoring and at the monitoring device cooperating of the temperature of rolling the slab within the assembly in advance, and described data processing equipment also in the basic adjusted of monitoring programme to the right reciprocal position of small part roller, roll in advance so that carry out, make the thickness that leaves the right slab of last roller reduce at least 10%, so that eliminate the liquid phase pond and make the zone contact that is in the two-phase state, thereby make central consolidated structures grain refinement and make central segregation and hole reduce to minimum.
According to the device of the sheet billet of leaving continuous casting plant being implemented controlled pre-rolling of the present invention, in described device, roll in advance be by at one or more many rollers of being provided with in the assembly of rolling in advance to carrying out, first rolls the downstream of assembly near the bottom roller of mold in advance, be provided with at least one movable roller roller centering, roller is to disposing pressure sensor and hydraulic cavities mechanism, be provided with position sensor, pressure sensor and position sensor and data processing equipment cooperating, at least the first roller has just left mold and slab that have thin curing crust to processing, it is characterized in that: the monitoring device that also is provided with liquid pool temperature in the monitoring tundish, the monitoring device of the temperature of monitoring slab, the monitoring device whether monitoring device of prison sheet billet speed and monitoring liquid phase pond exist.
Controlled pre-rolling, be soft depressing, the major advantage of depressing that promptly has liquid phase core or liquid pool has two, first advantage is to use the crystallizer with big thickness can produce the slab (30-60mm) of thinner thickness in the outlet of conticaster, that is to say, vertically the width of the short side by the crystallizer passage greater than controlled pre-rolling after the final thickness of slab.
This controlled pre-rolling has improved the hydrodynamics character of liquid metal in the crystallizer of mold; Also improve the life-span that is contained in the nozzle of submergence on the tundish, improved the character in the fusion process that is placed on the powder on liquid metal top in the mold.
Second advantage of the present invention is the grain refinement that has realized metal-cured structure, eliminated the center segregation of slab.
In two kinds of situations, if implement soft pressure, then must controllably reduce the thickness of slab continuously, this can bear the taper form of the soft slab part of depressing and realize.
The length of this tapering part can be preferably 3.8 meters to 6.3 meters in 0.8 to 7 meter scope, bigger length is corresponding to the end in the containing district of the generation of the containing roller after crystallizer downstream and bottom roller.This length with the part that the thickness of taper development reduces depends on following metallurgy factor.
Different steel grades solidifies in remarkable different mode and takes place; The steel of phosphorus content low (C is less than 0.10%), its curing characteristic are short cylinder crystal grain, and curing face moves forward with the state of compactness, do not have big intermittently, but short two-phase section are arranged.The curing characteristic of the steel of phosphorus content height (C is more than 0.70%) is a long column shape crystal grain, and curing face produces bough crystal mesh lattice with big intermittently moving forward, and wherein leaves the liquid steel of separation.In this case, two-phase section is very wide.
The moment that two curing faces (above and below of slab) are joined is for internal soundness, more in general, is the crucial moment for the remaining mass of slab.
In fact, as everybody knows because bulking effect (two-phase to contain roller between the expansion of slab), the liquid of segregation is produced the backflow effect; This bulking effect can be restricted, but can not eliminate fully.
When opening owing to the bulking effect slab, the liquid between the dendrite is by the center line of the suction of the hole between the dendrite to slab.When slab passes down pair of rolls and when closed, liquid is from the interdendritic hole of the reverse blowback of above-mentioned center line.The center line that this backflow that replaces acts on slab has formed positive and negative segregation.In order to prevent flowing back and forth of segregation liquid, must manage by between the closed dendrite of the method for the curing face of making compact conformation and the path of a crystal grain and next intergranule.By the saddening slab, make that producing significant taper depresses, compress the two halves of slab mutually, so just can realize this point.
Owing in each steel grade, produce two-phase section in various degree, so two curing faces are interpenetrated.
Low and the steel that have short two-phase section of phosphorus content, above-mentioned interpenetrating must reach several millimeters, to a degree of depth, solid portion solid (accounting for 90-95%) on this degree of depth, the little space between the dendrite is actual to disappear.
Phosphorus content and steel that have long two-phase section, above-mentioned interpenetrating must be with mode to a solid portion of unanimity less (accounting for 70% at most), the degree of depth that interdendritic space is very big.
Therefore, depend on steel grade at the solid portion of end the best of depressing, the conclusion that must remember is, solid portion be changed to 2% to 2.5% up and down, this depends on metallurgy factor.C content (%) solid portion (%)＜0.20 950.20-0.40 900.40-0.70 80＞0.70 70
When carrying out soft depressing, this means that the tapering part that slab thickness reduces must occur in the zone that standing part is suitable for obtaining good internal soundness most.
Let as assume that, wish that obtaining thickness in the conticaster end is the slab of 30mm, originate in the short side of the 50mm of mold crystallizer, and the supposition steel is the C70 type.
That should carry out depresses for 20mm (50-30).
When having estimated after the distribution that slab divides admittedly on the existing conticaster, must obtain and leave the much distances of meniscus of mold crystallizer liquid metal, in leaving the slab of crystallizer, there is 70% solid portion in distance (15 is half of 30) from surperficial 15mm.
Let us supposes that this distance apart from falcate is 4 meters.If in the crystallization be 1.2 meters long, the then soft length of depressing (Lsr) is necessary for:
Lsr=4-1.2-2.8 rice
The gradient G sr that depresses is necessary for:
Gsr=(50-30)/2.8=7.143mm/m
That is to say that every meter thickness that must carry out is reduced to 7.143mm outside the crystallizer.
Therefore, pre-rolling method of the present invention is a kind of online curing model, and this model can be obtained the accurate distribution that slab solidifies on the basis of existing conticaster.This model can be calculated and be rolled length-Lsr-in advance and that is to say, calculate along conticaster the degree of depth apart from the surface equal the slab of producing one half thickness place have the position of needed solid portion.
Calculate after the above-mentioned value,, promptly form a rolling gradient G sr that depresses and make the end of depressing roll length L sr in advance to what calculate by the tapering part that the following manner adjustment is depressed.
This result realizes by following manner, promptly with controlled, the mode that needs reduces the length in liquid phase awl or liquid phase pond, thereby reduces the non-steel alloy in medium carbon content to greatest extent, or in-steel alloy of low carbon content in, or the situation of segregation appears in the steel of segregation appears in meeting.
Thisly make liquid awl length on demand, controlled minimizing can make congee shape zone keep in touch, and eliminates the generation of liquid phase with the axle construction such as the sort of that promotes as can generate with electromagnetic agitation.
Another purpose according to pre-rolling method of the present invention is to quicken the formation of crystal, thereby quickens the formation that column stable between slab one side crust and opposite side crust connects.
In according to method of the present invention, owing to roll the effect of rolling in advance that assembly applies in advance, above-mentioned column connection forms under the pressurized situation, and therefore, above-mentioned connection is very compact, has typical distribution.
The advantage of bringing like this is that the slab of leaving continuous casting plant is more compact and have significantly less thickness and a better planarization when arriving roll line.
By mainly casting parameter (speed for conduct; overheated in tundish; cooling of the secondary in mold downstream and steel grade) the liquid phase awl of function or the length in liquid phase pond dynamically control, the present invention also can make and start and shut down that (casting finishes or owing to realizes optimization and reduce waste product the transition period of accident.
In addition, can make thickness have all advantages relevant according to method of the present invention: lubricated powder (bigger melted surface with following factor greater than the casting in the mold of the slab of finished product thickness, the regularity that powder covers on the liquid steel) surface quality brought of the optimization of duty, (disturbance is little for flowing downward property in the overheated and mold of steel, meniscus is more stable), simultaneously also make the use of immersion geat become possibility with bigger cross section, thus more lasting.
Pre-rolling method of the present invention can reduce to flow out the cross-sectional area of slab, thereby can reach less final thickness, obtains the identical numerical value of rolling device.
According to the present invention, when continuous bend was cast, the pre-roll that is placed on the lateral surface of bending of equipment can be with the dynamometer cooperating, and dynamometer can be controlled pre-roll and act on pressure on the sheet billet.One pressure sensor is contained in each hydraulic cavities mechanism, and draught pressure is controlled.
According to the present invention, roller is to dividing one or more groups layout, and every group of roller rolls assembly in advance to constituting one.Each rolls assembly in advance and comprises a static part and a movable part.Example of this specification supposition, that is, crooked lateral surface contains static roller, and movable roller constitutes crooked medial surface, but in fact, both can exchange.
According to a kind of modification, crooked inside and outside side can comprise a stationary part and a movable part, they respectively with one of opposite side movable part and a static part co-operation.
According to first kind of layout of the present invention, each roller is to being furnished with a position sensor to monitor the distance between the relative roller.According to second kind of layout of the present invention, constitute every group of roller that rolls assembly in advance to comprising the sensor of two these module positions of monitoring, these sensors lay respectively at the upstream and downstream end that rolls assembly in advance, and the distance of monitoring between the relative roller of above-mentioned position.
According to a modification of second kind of layout of the present invention, each roller is to also disposing a position sensor.
By position sensor roll in advance in the assembly determine roller between a rolling passage; Parallel or the convergence in the two sides of this passage, this depends on specific requirement.
In addition, if each roller is to disposing a position sensor, then can roll passage in advance by what each the right roller that makes each roller was as requested located the longitudinal section of determining to have any concrete shape.
Whole system rolls control in advance by one and data processing equipment is controlled, this device receives the signal from pressure sensor and position sensor (no matter be single or belong to assembly), also receive from slab speed monitoring device simultaneously the signal of the temperature of the cast metal of fusing and the monitor of the temperature of the sheet billet that leaves mold.
Also other temperature monitoring can be set according to centre position of rolling the assembly working region in advance of the present invention, with the temperature of monitoring slab, these monitors also send signal to rolling control and data processing equipment in advance.
Can be provided with a kind of in addition for example may be the monitor of sonar type, whether has the liquid phase pond in the slab to be identified in, thereby correctly guarantees according to actual closure of rolling awl of liquid phase in the assembly or liquid phase pond in advance of the present invention.
Roll overall control and data processing equipment that control and data processing equipment can be connected in other in advance, or constitute its part, thereby it is handled all above-mentioned parameters and itself and the parameter of rolling in advance input or that be stored in the suitable internal storage is compared to roller best adjustment numerical value is provided.
Roll control and data processing equipment in advance and also can be connected in an attached transacter, this device is also delivered to it database except that all numerical value that provided by monitor are provided, the development and change of data during this database can show and/or be printed on necessarily.
In this manual, the meaning of roller is meant the roller that is arranged in continuous row or is divided into the roller of part, or band, or the like, thereby covered any system of the prior art.
The adjustment of using method of the present invention to carry out is the adjustment of single roller, or the then adjustment of a roll assembly of roll assembly, perhaps whole total adjustment of rolling assembly in advance.These adjustment can algebraic addition.
The slab thickness that can realize according to pre-rolling method of the present invention reduces between about 10% to 50%.Above-mentioned thickness reduce be one in 0.8 and 7 meter long stroke, obtain in 1.2 and 1.8 meters long strokes but be preferably in one.The reducing and constant value to obtain gradually of slab thickness.
According to a kind of modification, the substep that reduces of slab thickness carries out, and has a last finish to gauge part, wherein thickness to reduce be progressive.
According to a kind of modification, of the present inventionly roll the secondary cooling apparatus that assembly is furnished with slab in advance, for example this device can be made up of many nozzles.The flow rate of nozzle and feed pressure are all by controlling hot rolling and data processing equipment and/or overall control and data processing equipment adjustment, thereby assurance is to the continuous control of slab state.The adjusting of nozzle is by controlling along the board briquette monitor that rolls arrangement of components in advance.
According to another kind of modification, disclosed descaling device can be with according to the assembly cooperating that rolls in advance of the present invention at least one patent application EP-93110927.6 number of being submitted to by the applicant.This first descaling device that rolls the assembly upstream in advance that is installed in can make the sheet billet of being produced have the needed fabulous surface quality of extraordinary processing continuously.
According to a modification of the present invention, pre-roll between be provided with many descaling devices.
According to another modification of the present invention, between every pair pre-roll, be provided with descaling device.
According to another modification of the present invention, particularly when descaling device be located at pre-roll between the time, roller is by inner colded, with the surface of the oxidation scale under preventing to remove from sheet billet surface attached to roller.
The following drawings shows the layout of non-limiting example of the present invention and recommendation.
Fig. 1 is the side view that rolls assembly in advance according to the sheet billet by the continuous bend Foundry Production of the present invention;
Fig. 2 and 3 expressions are the possible form of two pre-rolls in addition;
Fig. 4 a and 4b are the schematic diagrames that rolls two kinds of possible positions of assembly in advance shown in Figure 1;
Fig. 5 represents the formation according to two-phase section of the present invention.
As shown in drawings, roll assembly 10 according to pre-rolling method of the present invention in advance by at least one and carry out, roll assembly 10 in advance and 14-16 is constituted by many rollers.
Only show these among Fig. 1 and roll in the assembly 10 first in advance, it and bottom roller 12 and mold 11 cooperatings can be produced sheet billet 20 continuously, also partly show one be close in the downstream second roll assembly 10 in advance.
In illustrated example, the curved outer 13 of assembly 10 is static promptly fixing part or the framework that rolls assembly 10 in advance, and the curved interior face 22 of assembly 10 is movable or loose part or the framework that rolls assembly 10 in advance.
The roller 14,114 of crooked lateral surface 13 and 214 and modification in other roller can be individually or configuration in groups with at least one dynamometer 15, dynamometer 15 sends signal to the control and the data processing equipment of pre-rolling device.
In the embodiment shown in fig. 1, the roller 16,116 of Wan Qu medial surface 22 and 216 and modification in other roller individually or in groups with at least one hydraulic cavities mechanism or cylinder 17 configurations.Each hydraulic cavities mechanism 17 is by a servo valve 19 controls, and the pressure sensor 18 that links to each other.Servo valve 19 is by the control and data processing equipment 21 controls of pre-rolling device.
In this embodiment, each roller is furnished with an independent position sensor 24 to 14-16, each rolls the sensor 24 that assembly 10 is furnished with two monitoring assembly positions in advance, and they are respectively to be arranged in the sensor 124a of the upstream extremity that rolls assembly 10 in advance and the sensor 124b of downstream.
When two module position sensors 24 be upstream position sensor 124a and downstream position sensor 124b respectively when rolling assembly 10 cooperatings in advance, can between roller is to 14-16, measure the rolling passage of wall with parallel or convergence.In this embodiment, module position sensor 124 is installed between the static curved outer 13 of rolling assembly 10 in advance and the movable curved interior face 22.
According to a modification (not shown), 124 of module position sensors link to each other with the movable curved interior face 22 that rolls assembly 10 in advance.
Each pressure sensor 18, each independent position sensor 24 and each module position sensor 124 also may receive control and check signal to control and data processing equipment transmission signal separately.Be associated with rolling in advance of being carried out, control and data processing equipment 21 were set or imported to parameter that may be relevant with the size of founding materials kind and sheet billet 20 before rolling in advance.Control and data processing equipment 21 are arranged roller in advance to 14-16,114-116, and 214-216, and ought begin to cast when starting bar has retracted, controls one by one and adjusts roller to 14-16,114-116,214-216 makes to roll in advance as required and carries out.
Roll in advance to realize the desirable of slab 20 thickness in order to adjust and to control, controlled reduces, according to the present invention, control and data processing equipment 21 dispose the cast metal temperature of monitoring fusing and monitor the monitoring device 25a of temperature in the tundish, monitor the monitoring device 25b of the temperature of the sheet billet 20 that leaves mold 11, and the monitoring device 26 of the speed of monitoring slab 20.All these monitoring device 25a; 25b and 26 sends signal to control and data processing equipment 21; thereby the pre-rolling method that is carried out can dynamically be controlled as slab 20 function of speed, and guarantee that startup and the transition state of shutting down obtain more suitable processing.
According to a kind of modification, can be provided with along the auxiliary monitoring device 25b of many monitoring slab 20 temperature of rolling assembly 10 location in advance, thereby in predetermined position control slab 20 variation of temperature.In this case, control and data processing equipment 21 are connected in overall control and data processing equipment 121 and introduce and collect the device 27 of data.
The overall control and the data processing equipment 121 of operation adjusted in control and data processing equipment 21 and/or control, and the monitoring degree of setting with the conticaster operator serves as that the basis is adjusted (for example) formation and rolled the reciprocal position of the roller of assembly 10 to the roller of 14-16 in advance.
Above-mentioned control and Adjustment System can make the thickness of slab 20 reduce 10% to 50%.
According to a kind of modification, roll the secondary cooling apparatus that assembly 10 disposes slab 20 in advance according to of the present invention, be many nozzles 30 in the present embodiment.The flow rate of nozzle 30 and feed pressure are preferably by control and data processing equipment 21 and/or overall control and data processing equipment 121 controls, thereby assurance is to the continuous control of slab 20 situations.The adjusting of nozzle 30 can be by controlling along the sheet billet temperature monitoring 25b that rolls assembly 10 layouts in advance.
According to a modification, the assembly 10 that rolls in advance of the present invention disposes at least one for example monitor 28 actual closing point to determine that liquid phase is bored in the slab 20 of sonar type.Described at least one monitor 20 preferably is connected in overall control and data processing equipment 121 to regulate secondary cooling apparatus 29.
Here cite an actual example, use the pre-rolling method of the present invention, the slab 20 that casting speed with 4.5 meters of per minutes is moved, one in 0.8 to 2.5 meter long long-range, be preferably in one in 1.2 to 1.5 meters long strokes the thickness from 70-75mm reduce to 50mm.
Depend on the program that is provided with in control and data processing equipment 21 and 121, the reducing and can carry out gradually of thickness with steady state value, or substep carries out, and still is preferably in last finish to gauge and partly carries out gradually.
In the present embodiment, in bottom roller 12 downstreams descaling device 23 is housed, its objective is to remove and roll the oxide layer that forms on the surface of slab 20 in assembly 10 downstreams in advance near the present invention so that produce sheet billet 20 with excellent surface quality.
According to a modification, more than one descaling device can be set, be placed on a roller 14-16 to and next roller between.
According to another distortion, the roller of being furnished with descaling device 23 is for example used the cooling liquid inner loop to the interior cooling device that 14-16 comprises pre-roll 14-16; Its objective is prevent that descaling device 23 from removing oxidation scale down from slab 20 surface since high temperature attached to the surface of roller, thereby to have avoided be the smooth maintenance and the prune job that must often carry out of maintenance roll surface.
Fig. 5 represent situation that crust 31 increases gradually and simultaneously two-phase section 32 strengthens gradually and slab 20 leave roll assembly 10 in advance before closed (two-phase section 32 mainly is owing to the pressure that rolls assembly 10 in advance forms), be enclosed in and roll in advance in the assembly 10 thereby make liquid phase bore 33 maintenances.
Claims (18)
1. the controlled pre-rolling assembly (10) of the sheet billet (20) of leaving continuous casting mould (11), described assembly (10) is near the downstream of the bottom roller (12) of mold (11), thereby the slab (20) that passes described assembly (10) has a liquid phase core (33), described assembly (10) has at least one part, and this part has:
One is close in slab (20) first main surface, and has the stationary part (13) of many rollers (14,114,214); And
One is close in slab (20) second main surface, and movable part with many rollers (16-116-216), these rollers (16,116,216) dispose at least one hydraulic cavities mechanism (17) by servo valve (19) control, be used to make roller (16,116, the 126) location of movable part (22).
2. assembly as claimed in claim 1 is characterized in that: many rollers of stationary part (13) (14,114,214) dispose at least one dynamometer (15).
3. assembly as claimed in claim 2 is characterized in that: each hydraulic cavities mechanism (17) disposes a pressure sensor (18) and position sensor (24).
4. assembly as claimed in claim 3, it is characterized in that: described dynamometer (15), servo valve (19) and pressure sensor (18) and position sensor (24) and control and data processing equipment (21) cooperating, described control and data processing equipment (21) have the device of feature that the liquid phase core (33) of parameter (27) and slab (20) is rolled in insertion/input in advance.
5. assembly as claimed in claim 1 is characterized in that, the roller (14-16) on each stationary part (13) and the movable part (22) is continuous roller (14-16).
6. assembly as claimed in claim 1 is characterized in that: the roller (14-16) on each stationary part (13) and the movable part (22) is made of independent parts (114-116).
7. assembly as claimed in claim 1 is characterized in that: the roller (14-16) on each stationary part (13) and the movable part (22) is supporting an endless belt (214-216).
8. assembly as claimed in claim 1 is characterized in that: the roller (16) of described movable part (22) disposes the hydraulic cavities mechanism (17) by a servo valve (19) control.
9. assembly as claimed in claim 1 is characterized in that: the roller (16) of described movable part (22) arranges that in groups every assembly is equipped with a hydraulic cavities mechanism (17) by a servo valve (19) control.
10. be used for producing band liquid phase core (33) sheet billet (20) the continuous casting mould (11) that comprises bottom roller (12) and be used for the combination of assembly that controlled pre-rolling leaves the sheet billet (20) of described continuous casting mould (11), described assembly (10) is near the downstream of bottom roller (12), thereby the slab (20) that passes assembly (10) has liquid phase core (33), assembly (10) has at least one part, and each part has:
Be located at the stationary part (13) that closes on slab (20) first main surfaces and have many rollers (14,114,214); And
Be located to close on slab (20) second main surfaces and have many rollers (16,116,216) and dispose at least one hydraulic cavities mechanism (17), be used to make roller (16,116, the 216) location of movable part (22) by a servo valve (19) control.
11. combination as claimed in claim 10 is characterized in that: many rollers of described stationary part (13) (14,114,214) dispose at least one dynamometer (15).
12. combination as claimed in claim 11 is characterized in that: described assembly (10) is with respect to described bottom roller (12) location, and its length makes the slab (20) that leaves described assembly (10) have the core (33) of incomplete curing.
13. controlled pre-rolling leaves the method for the sheet billet (20) of the continuous casting mould (11) that comprises bottom roller (12), has following steps:
Described bottom roller (12) from described continuous casting mould (11) when sheet billet (20) has liquid phase core (33) is removed sheet billet (20);
When the sheet billet of removing from described continuous casting mould (20) has liquid phase core (33), make that sheet billet (20) passes at least one stationary part (13) that rolls assembly (10) in advance and a relative movable part (22) and roller between (14-16), described stationary part (13) has many rollers (14,114,214), described movable part (22) has many and roller (16 at least one hydraulic cavities mechanism (17) cooperating, 116,216), described hydraulic cavities mechanism (17) is controlled by a servo valve (19), be used to make roller (16,116, the 216) location of movable part (22); And
Make roller (16,116, the 216) location of described movable part (22), have the controlled pre-rolling of the sheet billet (20) of liquid phase core (33) with realization.
14. method as claimed in claim 13 is characterized in that: many rollers of described stationary part (13) (14,124,214) and at least one dynamometer (15) cooperating.
15. method as claimed in claim 13 is characterized in that: describedly roll the length of assembly (10) in advance and the described location of described movable part (22) is controlled, so that realize the minimizing of about slab of 10% to 50% (20) thickness.
16. method as claimed in claim 13, it is characterized in that: describedly roll the length of assembly (10) in advance and the described location of described movable part (22) is controlled, make and leave the core (33) that the described sheet billet (20) that rolls assembly (10) in advance contains incomplete curing.
17. method as claimed in claim 16 is characterized in that: leaving the described solid portion that rolls the sheet billet (20) of assembly (10) in advance is about 67.5% to 97.5%.
18. method as claimed in claim 16 is characterized in that: leave the described sheet billet (20) that rolls assembly (10) in advance and have the central cores (33) of two-phase state, thereby make central consolidated structures grain refinement and make central segregation reduce to minimum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98119190 CN1224640A (en) | 1993-05-17 | 1998-09-15 | Method for controlled pre-rolling of thin slabs leaving continuous casting plant, and relative device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000083A93 | 1993-05-17 | ||
| CN 98119190 CN1224640A (en) | 1993-05-17 | 1998-09-15 | Method for controlled pre-rolling of thin slabs leaving continuous casting plant, and relative device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94104661A Division CN1043193C (en) | 1993-05-17 | 1994-04-25 | Method for the controlled pre-rolling of thin slabs leaving a continuous casting plant, and relative device |
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| CN1224640A true CN1224640A (en) | 1999-08-04 |
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| CN 98119190 Pending CN1224640A (en) | 1993-05-17 | 1998-09-15 | Method for controlled pre-rolling of thin slabs leaving continuous casting plant, and relative device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311939C (en) * | 2002-04-08 | 2007-04-25 | 住友金属工业株式会社 | Continuous casting method, continuous casting device and continuous casting blanket |
| CN101487782B (en) * | 2008-01-17 | 2011-07-27 | 北京东孚久恒仪器技术有限公司 | Cereal particle hardness measurement method and its hardness measurement instrument |
| CN101932396B (en) * | 2007-12-28 | 2014-12-24 | Sms西马格股份公司 | Continuous casting line with a device for determining stiffness states of a casting strand and associated method |
-
1998
- 1998-09-15 CN CN 98119190 patent/CN1224640A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311939C (en) * | 2002-04-08 | 2007-04-25 | 住友金属工业株式会社 | Continuous casting method, continuous casting device and continuous casting blanket |
| CN101932396B (en) * | 2007-12-28 | 2014-12-24 | Sms西马格股份公司 | Continuous casting line with a device for determining stiffness states of a casting strand and associated method |
| CN101487782B (en) * | 2008-01-17 | 2011-07-27 | 北京东孚久恒仪器技术有限公司 | Cereal particle hardness measurement method and its hardness measurement instrument |
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