EP0068814B1 - Verfahren und Einrichtung einer Bogenstranggiessanlage - Google Patents

Verfahren und Einrichtung einer Bogenstranggiessanlage Download PDF

Info

Publication number
EP0068814B1
EP0068814B1 EP82303283A EP82303283A EP0068814B1 EP 0068814 B1 EP0068814 B1 EP 0068814B1 EP 82303283 A EP82303283 A EP 82303283A EP 82303283 A EP82303283 A EP 82303283A EP 0068814 B1 EP0068814 B1 EP 0068814B1
Authority
EP
European Patent Office
Prior art keywords
straightening
strand
rolls
bow
casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82303283A
Other languages
English (en)
French (fr)
Other versions
EP0068814A1 (de
Inventor
Tadashi Murakami
Zenzo Soejima
Chihiro Yamaji
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=14233744&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0068814(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to AT82303283T priority Critical patent/ATE11495T1/de
Publication of EP0068814A1 publication Critical patent/EP0068814A1/de
Application granted granted Critical
Publication of EP0068814B1 publication Critical patent/EP0068814B1/de
Expired legal-status Critical Current

Links

Images

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
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal

Definitions

  • the present invention relates to a method for the continuous casting of a high-quality strand with a high production efficiency, as well as to an apparatus for carrying out the method mentioned above. More particularly, the present invention relates to a bow-type continuous-casting method and apparatus in which a strand is straightened in a multi-point straightening zone by means of a plurality of pairs of straightening rolls which define curves having successively increasing radii.
  • the present invention relates to an improvement in the bow-type continuous-casting method and in the apparatus, the apparatus having a low height and comprising a multi-point straightening zone, in which pairs of the straightening rolls are successively arranged, the aim of the above method and apparatus being to realize a directly combined continuous-casting and rolling process (hereinafter referred to as the CD process).
  • the CD process has attracted attention because of a reduction in the amount of thermal energy required to produce hot-rolled products according to this process and because the CD process enables strands formed in a continuous-casting machine and having a high sensible heat to be directly supplied to a hot-rolling mill without being subjected to cooling, conditioning and reheating, and thereby predetermined hot-rolled products are obtained.
  • the following must be reliably and simultaneously achieved in continuous casting: (1) the temperature of the strands must be high enough to allow direct hot-rolling; (2) the quality of the strands must be high enough to allow the production of hot-rolled products having desired qualities regardless of whether or not the strands are conditioned; and (3) the strand productivity must be higher than that of the conventional casting so as to compete with the high productivity of a hot-rolling mill.
  • the present applicant has already proposed new continuous-casting methods and apparatuses so that the above-mentioned (1), (2), and (3) can be effectively achieved.
  • the basic concept of the applicant's proposals involves high-speed and moderate-cooling casting carried out in a bow-type continuous-casting machine having a low height and comprising a multi-point straightening zone. More in detail, in the continuous-casting machine according to the applicant's proposals, casting is carried out at a higher speed and more moderate cooling than in the conventional, widely used, bow-type continuous-casting machine, in which machine the machine height is 12 m or more, the radius of the curve is from 10 to 13 m, and the straightening of a strand is carried out by means of single unbending or one-point straightening.
  • the casting conditions according to the applicant's proposals enable surface defects in strands to be prevented and, further, enable high-temperature strands to be produced with a high productivity.
  • the bow-type continuous-casting machine is hereinafter referred to as a bow-type CCM.
  • Bow-type CCMs having high and low machine heights are hereinafter referred to as high-head and low-head CCMs, respectively.
  • the conventional bow-type continuous-casting machine mentioned above is hereinafter referred to as the conventional bow-type CCM.
  • the solidified shell of a strand has such a small thickness that its rigidity is decreased, with the result that a thin solidified shell is subjected to a high ferrostatic pressure due to the high machine height of the high-head CCM. Consequently, the bulging strain, which can cause inner defects in a strand, is increased. If the diameter of the rolls which support a strand is made small and if the distance between these rolls is decreased, an increase in the bulging strain can be prevented.
  • US-A-3,776,298 relates to a method and apparatus for pressure control of driven rolls of a withdrawal stand for continuously cast curved ingots.
  • the contact pressure of driven rolls is controlled to exceed only slightly the internal pressure of an ingot being withdrawn and is such as to maintain the normal operation on the basis of assumption that all driven rolls participate in the withdrawal operation. In the irregular operation mode, where some of the driven rolls drop out, the contact pressure is increased slightly to meet the resulting increase in the drive and pulling force requirement.
  • US-A-3,776,298 does not disclose or suggest a method or apparatus in which at least one pair of straightening rolls is shunted from the defined radius of a straightening curve.
  • Fig. 1 the low-head CCM produced by Sumitomo Metals Co., Ltd. (Trans. Iron & Steel Institute of Japan Vol 20. No. 12. 1980 page B-565) and described in Japanese Laid-open Patent Application Nos. 56-14062 through 14065 (1981) is schematically illustrated.
  • the machine height H of this low-head CCM which is collectively denoted by 1, is a little less than 6 m, and in the five-point straightening zone 2, six straightening rolls 7 are successively arranged in this zone 2 and define curves having successively increasing radii R 1 through R 5 respectively, R 1 is the basic radius of the curve and is 5800 mm and R 2 is 7100 mm.
  • a curved mold is denoted by 6.
  • the percentage of solidification of the molten steel in said section being straightened in the five-point straightening zone 2 is from 40 to 70%, the ferrostatic pressure applied to said section is low, and the surface temperature of said section is from 900 to 1000°C. Allegedly, the temperature of the strand is high, and the quality of the strand is not inferior to but instead is improved over that of a strand obtained by means of a high-head CCM.
  • the low-head CCM illustrated in Fig. 1 and described above is practically operated according to the information given in the above-mentioned technical report and has a machine height of a little less than 6 m, the basic radius (R,) of the curve being 5.8 m, and comprises a five-point straightening zone in which six straightening rolls 7 are successively arranged.
  • This low-head CCM is hereinafter referred to as the SH-CCM.
  • the former is distinct from the latter in respect to the following: (a) high-speed and moderate-cooling casting is carried out in a low-head CCM in which the machine height and the basic radius of the curve are as small as possible and in which the straightening points are increased; (b) with a decrease in the machine height and the basic radius of the curve, as well as an increase in the straightening points, the straightening strain can be better distributed in the strand and therefore can be decreased more; and (c) consequently, the above mentioned (1), (2), and (3) required for realizing the CD process can be reliably and simultaneously achieved.
  • the SH-CCM is distinct from the applicant's proposed CCM in respect to the following: (a) the SH-CCM is constructed so as to continuously cast steels of a special size or small lots while the continuous casting of mass produced steels is carried out in an existing continuous-casting machine in which the radius (R) of the curve is 12.5 m; (b) the machine height of the SH-CCM is such that it can be installed in a steel-refining mill without the necessity of creating additional space, the reason for the production of the SH-CCM being that previously the ingot-making yard and the ladle cranes of the steel-refining mill of the SH-CCM producer were idle due to an increase in the percentage of continuously cast steels; (c) as a result of (b), the costs of the SH-CCM, including the installation and construction costs are very low; and (d) strands are charged, as a rule, into a heating furnace in a rolling-mill with a hot charge.
  • a bow-type continuous-casting method wherein a strand is straightened, at a plurality of straightening points, by means of a plurality of pairs of straightening rolls which are successively arranged in a multi-point straightening zone and which define the radii of the curve of said strand, said radii successively increasing in the multi-point straightening zone, characterized in that during a non-stationary casting period in which the top section or bottom section of said strand is conveyed through said multi-point straightening zone, at least one selected pair of said straightening rolls is shunted from the defined radius of the curve, thereby increasing the distance between the pairs of straightening rolls, which pairs exert a straightening effect on said strand, and decreasing the number of straightening points of said multi-point straightening zone. Said distance is hereinafter referred to as the straightening roll pitch.
  • a bow-type continuous-casting apparatus having a low height and comprising a multi-point straightening zone in which a plurality of pairs of straightening rolls for straightening a strand are successively arranged and define curves having successively increasing radii, characterized in that at least one selected pair of said straightening rolls is operably connected to an elastic means for automatically shunting said at least one selected pair of the straightening rolls from the defined radius of the curve during a non-stationary casting period in which the top section or the bottom section of said strand is conveyed through said multi-point straightening zone.
  • the basic radius of the curve of the strand is from 3 to 5 m and the number of straightening points is from five to fifteen, so that the continuous-casting machine of the present invention has a low machine height.
  • the basic radius of the curve of the strand i.e., the radius of the curved mold, must be small or is preferably 5 m at the maximum.
  • the basic radius of the curve is, however, desirably at least 3 m according to the results of a study of the relationship between the basic radius of the curve, the casting speed, the thickness of the strand, and the technique of pouring molten steel into a curved mold.
  • a basic radius of the curve of the strand of at least 3 m is deemed to be necessary for eliminating any restrictions on the pouring of the molten steel into a curved mold, which is curved, when a strand having a thickness of 200 mm or more, particularly from 200 to 300 mm, is to be formed at a high casting speed of 1.2 m/min or more, particularly approximately 1.7 m/minute.
  • the section of the strand subjected to straightening has a surface temperature of 900°C or more and also has a solidified shell 60 mm thick or less at each side of the strand.
  • the number of straightening points for successively straightening said section must be three or more so as to keep the straightening strain below the permissible value at all the straightening points.
  • the casting of a strand includes a stationary casting period and a non-stationary casting period.
  • a section of the strand, or the so-called middle section is conveyed through the multi-point straightening zone in which the straightening rolls are successively arranged, the section having a high temperature and a thin solidified shell, containing a considerable amount of molten metal, and being subjected to a low ferrostatic pressure.
  • a load hereinafter referred to as the stationary roll load, is applied to each of the straightening rolls, all of which are successively arranged in the multi-point straightening zone, and the stationary roll load is the sum of the reaction force due to straightening P UB (M) and the reaction force due to bulging P ⁇ (M) (P UB (M)+P ⁇ (M)).
  • the stationary roll load is the sum of the reaction force due to straightening P UB (M) and the reaction force due to bulging P ⁇ (M) (P UB (M)+P ⁇ (M)).
  • a section of the strand, or the so-called top or bottom section in which virtually complete solidification of the molten metal is achieved, is subjected to multi-point straightening in a multipoint straightening zone in which the straightening rolls are successively arranged.
  • the load applied to the top or bottom section hereinafter referred to as the non-stationary roll load, essentially consists of the reaction force due to straightening P uB (T) or P uB (B).
  • the present inventors tentatively calculated the stationary and non-stationary roll loads in a low-head CCM under conditions in which: the basic radius of the curve of the strand was from 3 to 5 m; the number of straightening points in the multi-point straightening zone in which the straightening rolls are successively arranged was from 5 to 15; the cross section of the strand was from 200 to 300 mm in thickness and approximately 2000 mm in width; and high-speed and moderate-cooling casting was carried out.
  • the stationary roll load was from 3& to 45 tons (the reaction force due to bulging was from 10 to 15 tons and the reaction force due to straightening was from 20 to 30 tons).
  • the non-stationary roll load was from 200 to 240 tons, being from five to seven times as great as the stationary roll load.
  • the non-stationary roll load is only approximately three times as great as the stationary roll load.
  • the stationary and non-stationary roll loads applied to a 200-300 mm thick and approximately 2000 mm wide strand during its conveyance through a single-point straightening zone are from 60 to 70 tons and from 200 to 240 tons, respectively.
  • the straightening rolls of the multi-point straightening zone, which rolls are successively arranged must tolerate a considerably high load during the non-stationary period, which period is a very minor part of the entire casting period.
  • the inventors considered whether or not it would be possible for a multi-point straightening zone, in which the straightening rolls are successively arranged, particularly comprising from five to fifteen straightening points to have a straightening roll pitch enabling the bulging strain to be satisfactorily suppressed and a roll diameter capable of tolerating the non-stationary roll load.
  • the straightening rolls are periodically subjected to stationary and non-stationary roll loads, the non-stationary roll load being from five to seven times as great as the stationary roll load.
  • the life of the straightening rolls is shortened, and therefore the straightening rolls must be replaced frequently.
  • the number of straightening points is large, the CD process cannot be reliably realized.
  • a multi-point straightening zone in which a plurality of straightening rolls are successively arranged must simultaneously satisfy two requirements which are contradictory.
  • One of the requirements is that the straightening rolls be unlikely to undergo destruction.
  • the other requirement is that the straightening rolls be reliable.
  • the number of straightening points is small, the number of repeated applications of permissible stress (a a ), shown in the ordinate of Fig. 8, is small, which number is represented in the abscissa of Fig. 9 by "Na”.
  • the destruction stress at which a material undergoes destruction after a given number (Na) of repeated applications of permissible stress (a a ) is determined by the well-known S-N curve or W6hler curve.
  • the number of straightening points which can make possible fulfillment of one of the above-mentioned requirements does not make possible fulfillment of the other requirement.
  • These two requirements can be fulfilled in accordance with a concept of the present invention in which the middle section and the top or bottom section of a strand are straightened at different straightening strains, the straightening strain of the middle section being such that specifically the quality of the strand is ensured, and in which the straightening strain in the top or bottom section may be higher than the permissible value in the light of the quality of the strand since a part of the top or bottom section becomes a crop, and the reliability of the low-head CCM is specifically ensured and enhanced by decreasing the non-stationary roll load.
  • the present inventors discovered that the shunting of at least one pair of straightening rolls, hereinafter simply referred to as the shunting method, can increase the straightening strain and can decrease the non-stationary roll load, thereby increasing the number of repeated application of a permissible stress (aa) applied to the straightening rolls. Since the non-stationary roll load can be decreased by means of the shunting method and, further, since the number of straightening points in the multi- point straightening zone of the present invention is large, the reliability of the bow-type CCM according to the present invention is enhanced.
  • said at least one selected pair of straightening rolls shunted from the defined radius of the curve is either an even or an uneven numbered pair of straightening rolls as seen in the withdrawal direction of the strand.
  • the straightening roll pitch and the non-stationary roll load can be decreased by approximately one half.
  • a plurality of pairs of straightening rolls comprises a plurality of groups, each group comprising at least three pairs of straightening rolls, and said at least one selected pair of straightening rolls is either the second or a subsequent pair of straightening rolls of said groups as seen in the withdrawal direction of the strand.
  • the straightening roll pitch in each group and the non-stationary roll load can be decreased approximately 1/(n+1) times, wherein n indicates the number of pairs straightening rolls shunted in each group.
  • the multi- point straightening zone 10 comprises sixteen pairs of straightening rolls 11 successively arranged.
  • the machine height H is preferably from 3.4 to 5.2 m, and the basic radius R 1 of the curve defined by the curved mold is from 3 to 5 m.
  • Fig. 3 when a top or bottom section (not shown) having a length of from 500 to 1000 mm from either of the ends of the strand 3 and having a low temperature due to virtually complete solidification of the molten metal is conveyed through the multi-point straightening zone 10, the uneven numbered pairs of straightening rolls defining the radii R 1 , R 2 , R 3 , R 5 , R 7 , Rg, R 11 , R 13 , and R 15 are shunted straightening rolls and the bending-arm length is approximately doubled.
  • Fig. 4 an embodiment of the shunting method, which embodiment is appropriate for a low-head CCM having a machine height of, for example, 3 m, is schematically illustrated.
  • every three pairs of straightening rolls 11 as calculated in the withdrawal direction of the strand constitute one group, and therefore the multi-point straightening zone 10 has five groups of straightening rolls, the three pairs of straightening rolls 11 in each group being successively arranged.
  • the second and third pairs of straightening rolls 11 in the five groups are shunted from the defined radii R 2 , R 3 , R 5 , R e , R 8 , Rg, R 11 , R 12 , R 14 , and R 15 .
  • the basic radius R, of the curve may be 3 m, and the straightening roll pitch and the unbending-arm length are approximately tripled.
  • Fig. 5 an embodiment of the shunting method, which embodiment is appropriate for a low-head CCM having a height of, for example, 3 m, is schematically illustrated.
  • every four pairs of straightening rolls 11 as calculated in the withdrawal direction of the strand constitute one group, and therefore the multi-point straightening zone 10 has four groups, the four pairs of straightening rolls 11 each in group being successively arranged.
  • the basic radius R 1 of the curve may be 3 m, and the straightening roll pitch and the unbending-arm length are approximately quadrupled.
  • shunting is carried out during a period when the top or bottom section of a strand, where virtually complete solidification of the molten metal is attained, is conveyed through a multi-point straightening zone in which the straightening rolls are successively arranged. Shunting during this period is achieved by means of tracking a section of the strand being conveyed through the multi-point straightening zone mentioned above and then, upon detecting the border between the middle section and the top or bottom section of the strand, successively shunting pairs of the straightening rolls as seen in the withdrawal direction of the strand.
  • straightening-roll assemblies which are capable of realizing the shunting method are illustrated.
  • the two straightening-roll assemblies at either the inner or outer side of the strand are shown while the two straightening-roll assemblies at the other side of the strand are not shown.
  • One straightening-roll assembly, which is not shunted during a non-stationary casting period, is collectively denoted by 11s s while the other straightening-roll assembly, which is shunted during a non-stationary casting period, is collectively denoted by 11m.
  • the straightening-roll assembly 11s is hereinafter referred to as the stationary straightening roll assembly 11 s.
  • the straightening roll 11 of the stationary straightening-roll assembly 11 s is mounted on a bearing box 16 which is rigidly secured to a supporting frame 17.
  • the supporting frame 17 is rigidly secured by means of bolts and nuts 18 to the top surface of a supporting base 15, which is in turn secured to a stationary frame 14 of a low-head CCM by means of bolts and nuts 13. Therefore, the stationary straightening-roll assembly 11 s is stationarily arranged in the multi-point straightening zone during both the stationary and non-stationary casting periods.
  • the movable straightening-roll assembly 11 m comprises an elastic means which is operably connected to the straightening roll 11 so that the straightening roll 11 rotatably engages with the strand (not shown) and which is responsive to the stationary and non-stationary roll loads as a rigid body and an elastic body, respectively.
  • the elastic means preferably comprises cone-shaped springs 28 or a hydraulic cylinder (not shown). The cone-shaped springs 28 are secured between the supporting frame 17 and the supporting base 15.
  • the supporting frame 17 is preferably slidably mounted on the supporting base 15 so that the supporting frame 17 is slidably retracted towards a space 24 within the supporting base 15 during a non-stationary casting period.
  • the supporting base 15 has a large-diameter base part 20, which defines the space 24 therein, and a medium-diameter cylindrical part 21, which defines a vertical slot 23 therein.
  • the supporting frame 17 has a frame 25 for supporting the bearing box 16 and a flange 26, which comprises a downwardly protruding rod 27. The downwardly protruding rod 27 is inserted in and is vertically slidable along the vertical slot 23.
  • the cone-shaped springs 28 are preferably surrounded by the inner wall of a cylindrical sleeve 29 which is secured to the flange 26 but which is slidably displaced along the outer periphery of the medium-diameter cylindrical part 21 until the cylindrical sleeve 29 engages with the top surface of the large-diameter base part 20.
  • the length of the cylindrical sleeve 29 is determined so that the maximum stroke during slidable retraction of the supporting frame 17 is restricted by the distance between the top surface of the medium-diameter cylindrical part 21 and the lower end of the cylindrical sleeve 29 . during the stationary casting period.
  • the supporting frame 17 is capable of slidably retracting due to the force of the strand (not shown) during a non-stationary casting period.
  • a slidable advancing of the supporting frame 17 is preferably restricted by a stopper disc 30 which is secured to the lower end of the rod 27 by means of a bolt 31 and which can engage with the lower end of the medium-diameter cylindrical part 21.
  • the vertical position of the supporting frame 17 relative to the supporting base 15 can therefore be maintained within a predetermined range due to the cylindrical sleeve 29 and the stopper disc 30, the stopper disc 30 preventing the supporting frame 17 from moving away from the supporting base 15.
  • the straightening roll 11 of the movable straightening-roll assembly 11 m can be automatically retracted or displaced in a downward direction, as shown in the drawing; when the strand (not shown) exerts on said roll a critical force which is greater than the value predetermined by the cone-shaped springs 28.
  • This critical force is one half of the non-stationary roll load due to shunting of at least one selected pair of straightening rolls.
  • the inner roll displaced as described above tends to decrease the radius of the curve of the strand as compared with the radius (Rn) of the curve defined by the pair of straightening rolls before shunting or during the stationary casting period. This radius is simply referred to as the theoretical radius (Rn).
  • the outer roll displaced as described above tends to increase regarding the radius of the curve of the strand as compared with the theoretical radius (Rn).
  • the top section is between the second and third pairs of rolls.
  • the outer roll of the second pair of rolls is retracted and is subjected to a load which is determined by the cone-shaped spring operably connected to the outer roll.
  • the outer roll presumably still engages in the straightening of the strand since the outer roll exerts on the strand a force which is determined by the cone-shaped spring and which is less than the straightening force during the stationary casting period.
  • straightening is carried out essentially by the inner roll of the second pair of rolls. An increase in the straightening roll pitch and in the unbending-arm length therefore results since the pairs of rolls which engage in the straightening of the strand, i.e., the inner and outer rolls, are the first and third pairs of rolls.
  • both the inner and outer rolls of the second pair of rolls are retracted. After the top end of the strand has passed through the second pair of rolls, the inner and outer rolls of the second pair of rolls are reverted to their original positions.
  • the force to which the inner and outer rolls of the second pair of rolls are subjected during a non-stationary casting period is the stationary roll load.
  • the force to which the non-shunted first and third pairs of rolls are subjected during a non-stationary casting period is only approximately one half the non-stationary roll load according to the conventional straightening process.
  • the essential parts of the low-head CCM of the example according to the present invention are schematically shown in Fig. 2.
  • the continuous casting method of the present invention was carried out by means of a low-head CCM under the casting parameters given below.
  • the parameters of the low-head CCM were as follows:
  • the casting parameters during a normal continuous-casting period were as follows;
  • the stationary and non-stationary roll loads were from 28 to 33 tons and from 55 to 116 tons, respectively.
  • Produced strands having a cross section 250 mm thick and 2000 mm wide were free of internal and external defects and had a high temperature.
  • the life of the straightening rolls which was calculated on the basis of the non-stationary roll load, was such that the rolls could withstand repeated applications of the non-stationary roll load of 1.5x10 B times.
  • Continuous casting in accordance with the method described in the above example was repeated except that all of the straightening rolls were stationary during the stationary and non-stationary casting periods.
  • the stationary and non-stationary roll loads were from 28 to 33 tons and from 108 to 231 tons, respectively. Strands produced were free of internal and external defects, but the non-stationary roll load was, on the average, twice as high as that of the above example.
  • the straightening rolls could withstand repeated applications of the non-stationary roll load of 2x10 4 times. This value was approximately 1/75 times as low as that of the above example. That is, according to the shunting method, the life of the straightening rolls could be prolonged approximately 75 times as long as in the case of conventional continuous casting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Mold Materials And Core Materials (AREA)
  • Dental Preparations (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Casting Devices For Molds (AREA)
  • Golf Clubs (AREA)

Claims (12)

1. Bogenstranggießverfahren, bei dem ein Strang (3) an mehreren Richtstellen mit Hilfe mehrerer Richtwalzenpaare (11) ausgerichtet wird, die nacheinander in einer Mehrfach-Richtzone (10) angeordnet sind und die Krümmungsradien (R) des Strangs definieren, die in der Mehrfach-Richtone (10) nacheinander zunehmen, dadurch gekennzeichnet, daß während eines nichtstationären Gießintervalls, in dem der obere Abschnitt oder der untere Abschnitt des Strangs durch die Mehrfach-Richtzone (10) transportiert wird, mindestens ein ausgewähltes Paar von Richtwalzen (11) gegenüber dem vorgegebenen Radius (Rn) des Bogens verschoben wird, so daß sich der Abstand zwischen den Richtwalzenpaaren (10) erhöht, die eine Richtwirkung auf den Strang (3) ausüben, und sich die Anzahl der Richtpunkte der Mehrfach-Richtzone (10) erniedrigt.
2. Bogenstranggießverfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Basisradius (R1 in den Figuren 2 bis 5) des Bogens des Strangs (3) von 3 bis 5 m und die Richtpunkteanzahl von 5 bis 15 beträgt (Figuren 2 bis 5).
3. Bogenstranggießverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß mindestens ein ausgewähltes Richtwalzenpaar (11), das gegenüber dem vorgegebenen Radius (Rn) des Bogens verschoben ist, entweder ein geradzahliges (Figure 2) oder ein ungeradzahliges, (Figuren 1 und 3) Richtwalzenpaar (11) oder mehrere derartige Paare in Ausziehrichtung des Strangs (3) ist.
4. Bogenstranggießverfahren nach einem der Ansprüche 1 bis 3 dadurch gekennzeichnet, daß mindestens ein Richtwalzenpaar (11) mehrere Gruppen von jeweils mindestens drei Richtwalzenpaaren (11-Figur 3) aufweist und daß das mindestens eine ausgewählte Richtwalzenpaar entweder das zweite oder ein nachfolgendes Richtwalzenpaar (11) der Gruppen in Ausziehrichtung des Strangs (3) ist.
5. Bogenstranggießverfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Strang (3) beim Abschluß des Mehrfachrichtens eine Temperatur von mindestens 900°C hat.
6. Bogenstranggießanlage zum Durchführen des Verfahrens nach einem der Ansprüche 1 bis 5, mit geringer Höhe und mit einer Mehrfach-Richtzone (10), in der mehrere Richtwalzenpaare (11) zum Ausrichten eines Strangs (3) nacheinander angeordnet sind und Bögen mit aufeinanderfolgend zunehmenden Radien (R) definieren, dadurch gekennzeichnet, daß mindestens ein ausgewähltes Richtwalzenpaar (11) betrieblich mit einer elastichen Einrichtung zum automatischen Verschieben zumindest eines ausgewählten Richtwalzenpaars gegenüber dem definierten Radius (Rn) des Bogens während eines nicht-stationären Gießintervalls verbunden ist, während dessen der obere oder der untere Abschnitt des Strangs (3) durch die Mehrfach-Richtzone (10) transportiert wird.
7. Bogenstranggießanlage nach Anspruch 6, dadurch gekennzeichnet, daß die elastische Einrichtung einen Hydraulikzylinder aufweist.
8. Bogenstranggießanlage nach Anspruch 7, dadurch gekennzeichnet, daß die elastiche Einrichtung eine konisch geformte Feder (28) aufweist.
9. Bogenstranggießanlage nach Anspruch 8, dadurch gekennzeichnet, daß die konisch geformte Feder (28) zwischen einer Stützbasis (15) und einem verschiebbar auf dieser angeordneten Stützrahmen (17) befestigt ist, so daß der Stützraumen in einen Raum (24) innerhalb der Stützbasis (15) gleitend zurückgezogen wird.
10. Bogenstranggießanlage nach Anspruch 9, dadurch gekennzeichnet, daß die Stützbasis (15) ein Basisteil (20) mit großem Durchmesser, das den Raum (24) umschließt, und ein Zylinderteil (21) mit mittlerem Durchmesser aufweist, in dem ein Vertikalschlitz ausgebildet ist, und daß der Stützrahmen ein Lager einer Richtwalze trägt und einen Flansch (26) mit einer nach unten vorstehenden Stange (27) aufweist, die sich in dem Vertikalschlitz befindet und in diesem vertikal verschiebbar ist.
11. Bogenstranggießanlage nach Anspruch 10, dadurch gekennzeichnet, daß die konisch geformte Feder (28) von der Innenwand einer zylindrischen Hülse (29) umgeben ist, die am Flansch des Stützrahmens (17) befestigt und gegenüber dem Außenumfang des Zylinderteils (21) mit mittlerem Durchmesser verschiebbar ist, bis die zylindrische Hülse (29) mit der Oberseite des Basisteils (20) mit großem Durchmesser in Eingriff kommt, und daß die zylindrische Hülse so lang ist, daß der Maximalhub während der Rückwärtsverschiebung des Stützrahmens (17) durch den Abstand zwischen der Oberseite des Zylinderteils (21) mit mittlerem Durchmesser und dem unteren Ende der zylindrischen Hülse (29) während eines stationären Gießintervalls beschränkt ist.
EP82303283A 1981-06-25 1982-06-23 Verfahren und Einrichtung einer Bogenstranggiessanlage Expired EP0068814B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82303283T ATE11495T1 (de) 1981-06-25 1982-06-23 Verfahren und einrichtung einer bogenstranggiessanlage.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56098964A JPS58363A (ja) 1981-06-25 1981-06-25 多点矯正彎曲型連続鋳造方法及び装置
JP98964/81 1981-06-25

Publications (2)

Publication Number Publication Date
EP0068814A1 EP0068814A1 (de) 1983-01-05
EP0068814B1 true EP0068814B1 (de) 1985-01-30

Family

ID=14233744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82303283A Expired EP0068814B1 (de) 1981-06-25 1982-06-23 Verfahren und Einrichtung einer Bogenstranggiessanlage

Country Status (8)

Country Link
EP (1) EP0068814B1 (de)
JP (1) JPS58363A (de)
AT (1) ATE11495T1 (de)
AU (1) AU531512B2 (de)
BR (1) BR8203701A (de)
CA (1) CA1189281A (de)
DE (1) DE3262130D1 (de)
ES (1) ES8306969A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013224557A1 (de) 2013-11-29 2015-06-03 Sms Siemag Ag Stranggießanlage und Verfahren zum Stranggießen eines Metallstranges

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406746B (de) * 1998-11-06 2000-08-25 Voest Alpine Ind Anlagen Verfahren zum stranggiessen von metall sowie stranggiessanlage hierzu
KR101736574B1 (ko) * 2015-06-04 2017-05-17 주식회사 포스코 응고 장치
CN112938539A (zh) * 2019-11-26 2021-06-11 苏政委 一种袋装货物自动装车码垛机
CN113070370A (zh) * 2021-05-03 2021-07-06 芜湖恒泰有色线材股份有限公司 一种成品无氧铜杆连续冷拉放卷在线矫直机构

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2144750B1 (de) * 1971-07-02 1976-08-06 Mannesmann Ag
JPS5180624A (en) * 1975-01-13 1976-07-14 Nippon Kokan Kk Haganenorenzokuchuzoho oyobi sonosochi
DE2544556C3 (de) * 1975-10-04 1978-09-21 Demag Ag, 4100 Duisburg Stützrollengerüst für Staht-Brammenstranggießanlagen, insbesondere für Bogen-Brammenstranggießanlagen
DE3011137B1 (de) * 1980-03-22 1981-08-20 Mannesmann Demag Ag, 4100 Duisburg Verfahren zum Regeln der Einzelantriebe einerbogenstranggiess-Vielrollenmaschine fuer Metall,insbes. fuer Stahl,und Antriebsanordnung dazu

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013224557A1 (de) 2013-11-29 2015-06-03 Sms Siemag Ag Stranggießanlage und Verfahren zum Stranggießen eines Metallstranges
EP2893993A1 (de) 2013-11-29 2015-07-15 SMS Siemag AG Stranggießanlage und Verfahren zum Stranggießen eines Metallstranges

Also Published As

Publication number Publication date
BR8203701A (pt) 1983-06-21
EP0068814A1 (de) 1983-01-05
ES513478A0 (es) 1983-06-16
ES8306969A1 (es) 1983-06-16
CA1189281A (en) 1985-06-25
JPS58363A (ja) 1983-01-05
DE3262130D1 (en) 1985-03-14
AU531512B2 (en) 1983-08-25
AU8493982A (en) 1983-05-19
ATE11495T1 (de) 1985-02-15

Similar Documents

Publication Publication Date Title
CN1092343A (zh) 用于生产带钢、薄板坯或初轧板坯的方法
WO2022057924A1 (en) Controlling surface wrinkles on thin strip produced by twin roll casting and hot rolling
US3746071A (en) Method for treating materials
EP0068814B1 (de) Verfahren und Einrichtung einer Bogenstranggiessanlage
CA1153586A (en) Roll for rolling mill
CN110227806B (zh) 一种铸轧式连铸机凝固末端大压下装置
US3370641A (en) Reciprocating mold and coolant-support section continuous casting machine
US4043382A (en) Method and apparatus for continuously casting steel
KR100295954B1 (ko) 긴강재의제조방법
AU658451B2 (en) A process and an apparatus for the manufacture of billets and blooms from a continuously cast steel showing high or excellent quality
US3360974A (en) Apparatus for treating metal
US6308769B1 (en) Continuous casting plant for casting slabs with a continuous casting mold and a strand guiding unit composed of rollers
CN210280603U (zh) 一种铸轧式连铸机凝固末端大压下装置
US4131154A (en) Roller apron for a continuous casting installation for steel
US6070645A (en) Device for manufacturing a polygonal or sectional shape in a continuous casting plant
US4602966A (en) Method for improving the quality of cast ingot in continuous casting
CN211360593U (zh) 多边形铸坯的连铸系统
CN109909302B (zh) 一种连铸机扇形段出口处的铸坯铸轧方法
CN209886626U (zh) 牌坊式拉矫机及采用其进行压下的小方坯连铸机
CN106734207A (zh) 一种滚轧锻式锻件制造模具及方法
CN210280604U (zh) 多流直弧形宽扁坯连铸机生产线
JPH0437456A (ja) 内部品質に優れた連続鋳造鋳片の製造方法
US3810507A (en) Continuous casting plant for slabs
CN112203781A (zh) 薄金属带的高摩擦轧制
EP0105368B1 (de) Verfahren zur warmverformung von metallen, die beim walzen rissanfällig sind

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19820716

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL

ITF It: translation for a ep patent filed

Owner name: ING. C. GREGORJ S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL

REF Corresponds to:

Ref document number: 11495

Country of ref document: AT

Date of ref document: 19850215

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3262130

Country of ref document: DE

Date of ref document: 19850314

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19850529

Year of fee payment: 4

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: VOEST-ALPINE AKTIENGESELLSCHAFT

Effective date: 19851024

NLR1 Nl: opposition has been filed with the epo

Opponent name: VOEST-ALPINE AKTIENGESELLSCHAFT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19860623

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19860630

Year of fee payment: 5

BERE Be: lapsed

Owner name: NIPPON STEEL CORP.

Effective date: 19860630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19870227

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19870303

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19870623

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 19871128

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state