EP0205646A1 - Lingotière pour la coulée continue entre deux bandes, en particulier pour la coulée de l'acier - Google Patents

Lingotière pour la coulée continue entre deux bandes, en particulier pour la coulée de l'acier Download PDF

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Publication number
EP0205646A1
EP0205646A1 EP85107970A EP85107970A EP0205646A1 EP 0205646 A1 EP0205646 A1 EP 0205646A1 EP 85107970 A EP85107970 A EP 85107970A EP 85107970 A EP85107970 A EP 85107970A EP 0205646 A1 EP0205646 A1 EP 0205646A1
Authority
EP
European Patent Office
Prior art keywords
casting
mold
mold space
seals
width
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.)
Withdrawn
Application number
EP85107970A
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German (de)
English (en)
Inventor
Dieter Dipl.-Ing. Figge
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.)
Fried Krupp AG
Original Assignee
Fried Krupp AG
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
Application filed by Fried Krupp AG filed Critical Fried Krupp AG
Priority to EP85107970A priority Critical patent/EP0205646A1/fr
Priority to US06/878,271 priority patent/US4664174A/en
Priority to JP61149893A priority patent/JPS623856A/ja
Publication of EP0205646A1 publication Critical patent/EP0205646A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0605—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two belts, e.g. Hazelett-process

Definitions

  • the invention relates to a double-strand continuous casting mold, in particular for casting steel, the mold space of which is limited laterally by endless side dams which run along with the cooled casting strips and which are supported in the region of the mold space on adjustable guide rulers, with an upper and lower frame with deflecting drums resting on one another via spacers Back-up rolls for the upper and lower casting belt and with seals that engage the casting belt and shield the mold space from the environment.
  • the casting belts are of such a width that they, like the backing rolls assigned to them, protrude considerably beyond the side dams.
  • the casting belt width is a multiple of the width of the mold space: with a strand width of the order of up to 200 mm, the casting strips have about three times the width of the mold space.
  • the space next to the side dams is required for the accommodation of the guiding rulers supporting these along with adjustment and for the secure sealing of the mold space against the coolant supplied in large quantities.
  • the previously known embodiments have the disadvantage that the casting belts only become hot in the area of the mold space, but only have the low temperature of the coolant supplied in the area next to the side dams.
  • the temperature distribution which is uneven across the width of the casting belts, is particularly disruptive when - as is particularly the case when casting steel - materials with a very high melting point are to be processed: Tests in this regard have shown that the casting belts in the area of the mold area have an average temperature of about 112 ° C versus only 20 ° C on the outer sections.
  • the temperature differences mentioned cause a different stretching of the casting belts both in the longitudinal and in the transverse direction and lead to deformation of the casting belt; these cannot be fully compensated for even by applying large clamping forces because the unstretched, cold outer sections of the casting belts cannot be stretched beyond a certain extent because of the associated additional stress; The transition areas between the hot middle and the cold outer sections of the casting belts are particularly at risk.
  • the cold outer sections of the casting belts are taut, while the hot, heavily stretched middle sections are bulging in an undefined direction, i.e. either a bulge directed towards the strand with good thermal contact or a bulge facing away from the strand can be deformed Form air gap and consequently poor thermal contact.
  • the deformation conditions during the casting process cannot be influenced insofar as, for example, a bulge directed against the strand can change into an opposite bulge at any time: areas, for example, with good thermal contact between The strand and the casting belt are transformed into areas with poor thermal contact.
  • the associated poorer cooling effect of the double-strand continuous casting mold in the worst case results in a break in the strand and thus the termination of the casting process.
  • the invention has set itself the task of further developing a double belt continuous casting mold of the type mentioned in such a way that even when casting high-melting materials such as steel, the temperature distribution is evened out, in particular over the width of the casting belts, thereby creating the possibility of the casting belts also being sufficient in the hot central section to keep it taut.
  • the idea of the solution on which the invention is based consists primarily in dimensioning the width of the casting belts so that they protrude laterally at most slightly beyond the outer surfaces of the side dams.
  • the back-up rollers are accordingly short in order to create space for the accommodation of seals which abut the casting belts above or below the side dams and shield the mold cavity inwards and outwards from the escape of molten metal or against the penetration of the supplied coolant.
  • the seals must also be designed such that they remain effective even at temperatures that can be above 200 ° C at the mold exit. It is particularly important to seal the mold cavity despite the use of narrow casting belts in the entrance area behind the mold cavity entrance, since the strand that forms there has only a thin shell.
  • the backup rolls are preferably not held laterally; their storage rather lies opposite the mold room (claim 2).
  • the support rollers and seals are held together on supports of the upper or lower frame (claim 3).
  • the seals preferably each have a cooled support arm and a rocker arm, which is supported with the interposition of a spring element on the support arm and on the associated casting belt (claim 4).
  • the seals should at least partially consist of a material or be coated in such a way that they can withstand the possibly high ambient temperatures.
  • the support rollers can be dimensioned such that they are longer than the mold cavity width: In such an embodiment, the side dams must be relatively wide in view of the sealing of the mold cavity.
  • the contact width of the seals by means of which they rest on the casting belts, can also be of the same size as the width of the side dams (claim 5); the back-up rolls are accordingly only in the area of the mold space upper or lower casting belt.
  • the advantage of this kus entryform is to be seen in the fact that even with a relatively narrow design of the side dams, penetration of molten metal between the interacting mold walls is excluded.
  • the support rollers are dimensioned such that their width is smaller than the mold space width (claim 6); the contact width of the seals preferably corresponds to the width of the side dams.
  • the advantage of this configuration is that the sealing and guiding elements (i.e. the seals and guiding rulers) in the area of the side dams are separated from the guiding elements (i.e. the support rollers) in the area of the mold space.
  • the invention also serves the purpose of making the temperature distribution in the longitudinal direction of the casting belts more uniform.
  • the increasing warming of the side dams in the casting direction and the casting belt side sections interacting with them can be limited according to the invention in that the side dams - in contrast to the prior art - are cooled at least in the outlet area, preferably also in the central area, of the mold space (claim 7). If the side dams are equipped with additional cooling in both areas, air cooling is preferably used in the central area of the mold space and water cooling is preferably used in the exit area.
  • the additional cooling can be implemented in such a way that coolant channels are assigned to the side dams in the area of the mold space in question are, the outlet openings opposite the side dam outer surfaces (claim 8).
  • such an embodiment can be used in which the coolant channels and their outlet openings are part of the guide rulers for the side dams (claim 9).
  • the upper and lower frames of the double belt continuous casting mold are sealed off from one another at the level of the mold space and thus limit a cooling space containing the seals (claim 10).
  • the mutual sealing can consist in a simple manner of sealing strips connecting the frame parts to one another (claim 11).
  • the subject matter of the invention can also be designed such that the side dams at the mold cavity inlet are preheated to a higher temperature, approximately to the average casting belt temperature prevailing there (claim 12).
  • the casting belts 1 and 2 which, with endless side dams 3 and 4 arranged between them, limit the mold space 5, which is rectangular in cross section, are designed to be several times wider than the width K of the mold space: With a mold cavity width of 180 mm, the casting belt width G is 535 mm.
  • Each casting belt 1, 2 runs in the area of the mold cavity inlet 5a and mold cavity outlet 5b on a deflection drum 6 or 7 in such a way that the pouring direction indicated by an arrow 8 in FIG. 1a - corresponding to the direction of movement of the side dams 3, 4 in Area of the mold room 5 - results.
  • the length of the mold space 5 is determined by the mutual distance between the mold space inlet 5a and the mold space outlet 5b.
  • the following temperatures exist at the mold exit 5b: the outer sections of the casting belts still have the temperature T R thanks to the associated water cooling; the average casting belt temperature in the area of the mold cavity exit T A is 82 ° C (inside: 93 ° C, outside: 71 ° C); the temperature of the non-cooled side dams increased to T SA 350 ° C when they moved in the pouring direction.
  • the mean casting belt temperature in the area of the mold cavity over its length is then approximately 112 ° C. compared to 20 ° C. on the outer sections.
  • the resulting uneven stretching of the casting belts which cannot be compensated for even by applying large tensile forces in the longitudinal direction, leads to casting belt deformations with gap formation between the casting belts 1, 2 and side dams 3, 4 and, in part, to the loss of thermal contact between the strand and the casting belts.
  • the conditions described have a particularly unfavorable effect when casting high-melting materials such as steel; However, they also shorten the service life of the casting belts to a considerable extent with materials such as copper and copper alloys and impair the cooling performance of the double-belt continuous casting mold.
  • the proposed solution according to the invention is to use the narrow casting belts - which approximately end with the outer surfaces of the side dams - to influence the previously described temperature conditions favorably and thereby to improve the operational safety of the double-strand continuous casting mold, especially when casting high-melting materials.
  • the upper frame 9 and the lower frame 10 of the double belt continuous casting mold are supported against one another by sealing elements 11 on sealing strips 12 running in the longitudinal direction of the mold space 5. These shield the room in which the outer surfaces 3b, 4b of the side dams are located from the surroundings.
  • the position of the side dams is defined by guide rulers 13 resting against them, the adjusting rods 14 of which penetrate the sealing strips 12 in a movable manner and are held on the outside by adjusting screws 15 in a bracket 16; this in turn is fastened to the subframe 10 so as to be rotatable about a bearing pin 17.
  • adjusting screws 15 By turning the adjusting screws 15, the position of the associated guide ruler 13 can be changed continuously.
  • the sealing between the adjusting rod 14 and the sealing strip 13 takes place via a plurality of sealing rings 12a held therein.
  • the frame parts 9 and 10 are equipped above and below the sealing strips 12 with cross members 18, on which support rollers 19 and, with the interposition of support plates 20, seals 21 are supported in the longitudinal direction of the mold space 5.
  • the support rollers 19 rest on guide ribs 19a in the area of the mold space 5 and in the area of the side dams 3a, 4a on the upper and lower casting belts 1a and 2a.
  • the length of the support rollers is shorter than the mutual distance between the side dam outer surfaces 3b and 4b (corresponding to the casting belt width Ga shown in FIG. 2b).
  • the sealing between the casting belts and the side dams takes place via the seals 21 already mentioned, which resiliently bear laterally next to the support rollers 19 on the outer sections of the casting belts 1a, 2a.
  • the contact width D of the seals, by means of which they rest on the casting belts 1a, 2a, is accordingly smaller than the width S of the side dams (cf. FIG. 6a).
  • the seals 21 ensure that the cooling water supplied through bores 18a of the cross member 18 into the area of the casting belts cannot penetrate into the mold space.
  • the cooling water is introduced via Feed pipes 22, which are arranged above or below the cross member 18;
  • FIG. 3 shows an example of the feed tube which is only assigned to the subframe 10.
  • the embodiment according to FIG. 4 differs from the embodiment according to FIG. 3 in that the sealing strip 12 only serves to shield the space 36 against cooling water, in which the side dam outer surface is also used 3b is arranged.
  • the position of the upper frame 9 with respect to the lower frame 10 is carried out via spacers 37, which are located outside of the space 36 next to the sealing strip 12.
  • Each support roller 19 (see FIG. 5) is composed of two cylinder bodies 19b and 19c which are fastened to one another by means of a tension bolt 23.
  • a support rib 19a is pushed onto the tapered central part 19d of the cylinder body 19b and supports the illustrated upper casting belt 1a in the region of the vertical central plane 5c of the mold space 5.
  • the rotary bearing of the support roller 19 consists of roller bearings 24 which are supported on the middle part 19d and on two webs 18b of the cross member 18; the shielding of the rolling bearings against the surrounding cooling water is not shown for reasons of clarity.
  • the position of the parts 24 and 19a with respect to the middle part 19d is carried out via bushings 25, 26 and 27.
  • the webs 18b and roller bearings 24 are arranged so that they are in the region of the extension of the mold space 5 upwards or downwards on the associated casting belt 1a or 2a.
  • the cylinder bodies 19b and 19c are each equipped with a plurality of support ribs 19a.
  • the seals 21 are equipped with a support arm 28 screwed to the support plate 20, to which a metal rocker arm 30 is movably attached via a bolt 29. This is supported outside of the bolt 29 via a prestressed spring 31 on the support arm, which is connected to a cooling water circuit via cooling water bores 28a. Since the lower seals 21 abutting the casting belt 2a are additionally stressed, the associated springs 31 must be designed or preloaded differently than the springs of the upper seals. These only have to absorb the pressure forces occurring in the mold space.
  • the associated support rollers (corresponding to the embodiment according to FIG. 3) can be dimensioned such that they also cover the casting belts 1a, 2a in the area above or below the sides support dams; the area of the conveyor belt covered by the cooling water is accordingly relatively large.
  • the seals 21 are dimensioned and arranged in such a way that their contact width D - over which they rest on the casting belts 1a and 2a - corresponds approximately to the side dam width S.
  • the respective support rollers, not shown, arranged between the seals 21 accordingly have a length that is smaller than the mold space width K.
  • the advantage of this embodiment is that it enables a better sealing of the mold space 5, even if side dams with a relatively small width S are used. Since the seals 21 support the casting belts 1 a, 2 a directly next to the mold space 5 (in contrast to the support rollers), the formation of gaps between the casting belts and side dams in the area of the mold space is excluded. The embodiment in question is therefore better suited than the embodiment according to FIG. 6a for casting molten steel under pressure.
  • the increasing warming of the side dams 3a and 4a with the movement in the casting direction can be limited in that they are additionally subjected to cooling following the entry region of the mold space 5 (corresponding to approximately 20 to 25% of the total length of the mold space).
  • the right-hand guide ruler 13 which is shown by way of example, is held by two via an angle arm 14a on the subframe 10 Air guide channels 38 equipped, the outlet openings 38a opposite the associated side dam 4a at a distance.
  • the double belt continuous casting mold can also be advantageously designed to equalize the temperature distribution in the casting belts in that the air guide channels 38 with the guide plates 39 extend without interruption into the outlet region of the mold chamber 5, i.e. cool the side dams and seals in the middle and outlet region.
  • the guide rulers 13 are simultaneously designed as cooling units, via which cooling water is supplied to the side dam outer surfaces (for example the outer surface 4b of the side dam 4a shown) and the seals 21.
  • the guide rulers each receive a cooling water bore 40 running in the longitudinal direction, which merges into a feed funnel 40a on the side facing the side dam and then into outlet bores 40b tangential to the side dam.
  • the simultaneous use of an additional air cooling (Fig. 7) and an additional water cooling (Fig. 8) leads to the training shown in Fig. 9 of the subject of the invention.
  • the double-strand continuous casting mold is equipped with air cooling L in the central area of the mold space and with water cooling W for the side dams in the outlet area.
  • the additional cooling allows the temperature conditions in the area of the mold walls to be influenced in such a way that the casting belts and side dams at the mold space outlet 5b have approximately the same temperature.
  • the cooling sections L and W preferably each extend over a region of approximately 40% of the length of the mold space; the length of the entrance area preceding the cooling section L without additional cooling of the side dams is accordingly about 20% of the mold space length.
  • the guide and sealing elements in the area of the side dams 3a, 4a are of the guide elements in the area above and below the mold space 5 (ie the support rollers 19) Cut.
  • This separation has been brought about in that the contact width D of the seals 21, by means of which they rest on the casting belts 1a, 2a, corresponds to the side dam width S.
  • the width B of the support rollers 19 is accordingly smaller than the mold cavity width (see, for example, Fig. 2a, b), so that the support rollers support the casting belts 1a, 2a only outside the area in which the casting belts also abut the side dams are held.
  • the associated roller bearings 24 are located near the vertical center plane 5c through the mold space 5.
  • the arrangement of the support rollers 19 only outside the area of the side dams makes it possible to support the upper or lower casting belt 1a or 2a independently of the geometric conditions given by the side dams and thereby counteract the development of undesired casting belt deformations.
  • the advantages achieved by the invention are that due to the use of narrow casting belts - the width of which corresponds to the mutual distance of the side dam outer surfaces - no cold casting belt outer sections can arise which hinder the elongation of the casting belts in the longitudinal direction.
  • the equalization of the temperature distribution in the longitudinal and transverse directions of the casting belts results in less stress and thus a comparatively longer casting belt service life and better cooling effect of the double belt continuous casting mold. Impairment of the quality of the cast product and / or the operational safety of the double strip continuous casting mold by the formation of undesirable strip deformation is excluded.
EP85107970A 1985-06-27 1985-06-27 Lingotière pour la coulée continue entre deux bandes, en particulier pour la coulée de l'acier Withdrawn EP0205646A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP85107970A EP0205646A1 (fr) 1985-06-27 1985-06-27 Lingotière pour la coulée continue entre deux bandes, en particulier pour la coulée de l'acier
US06/878,271 US4664174A (en) 1985-06-27 1986-06-25 Twin-belt continuous caster
JP61149893A JPS623856A (ja) 1985-06-27 1986-06-27 特に鋼鋳造用の複式ベルト型連続鋳造金型

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85107970A EP0205646A1 (fr) 1985-06-27 1985-06-27 Lingotière pour la coulée continue entre deux bandes, en particulier pour la coulée de l'acier

Publications (1)

Publication Number Publication Date
EP0205646A1 true EP0205646A1 (fr) 1986-12-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107970A Withdrawn EP0205646A1 (fr) 1985-06-27 1985-06-27 Lingotière pour la coulée continue entre deux bandes, en particulier pour la coulée de l'acier

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US (1) US4664174A (fr)
EP (1) EP0205646A1 (fr)
JP (1) JPS623856A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63286252A (ja) * 1987-05-20 1988-11-22 Nippon Steel Corp ツインベルト方式の連続鋳造方法
JP3095951B2 (ja) * 1994-07-19 2000-10-10 新日本製鐵株式会社 双ベルト式連続鋳造方法
CN113927002B (zh) * 2021-09-23 2023-10-10 内蒙古联晟新能源材料有限公司 一种用于哈兹列特铸轧机的加宽拼接工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857637A (en) * 1955-05-31 1958-10-28 Olin Mathieson Casting apparatus
GB1015314A (en) * 1963-11-13 1965-12-31 Davy & United Eng Co Ltd Continuous casting
BE673310A (fr) * 1964-12-11 1966-04-01
DE2926181A1 (de) * 1978-06-29 1980-01-03 Hitachi Ltd Stranggiessvorrichtung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2904860A (en) * 1955-12-27 1959-09-22 Hazelett Strip Casting Corp Metal casting method and apparatus
US3123874A (en) * 1958-03-17 1964-03-10 Metal casting apparatus
DE1433031A1 (fr) * 1960-12-08
LU79390A1 (fr) * 1978-04-06 1979-11-07 Metallurgie Hoboken Procede de coulee continue d'un metal et appareil pour sa mise en oeuvre
US4367783A (en) * 1980-10-27 1983-01-11 Hazelett Strip-Casting Corporation Method and apparatus for continuous casting of metal under controlled load conditions
US4552201A (en) * 1981-12-14 1985-11-12 Hazelett Strip-Casting Corp. Methods for shaping the casting region in a twin-belt continuous casting machine for improving heat transfer and product uniformity and enhanced machine performance
DE3232147C2 (de) * 1982-08-30 1984-12-06 Fried. Krupp Gmbh, 4300 Essen Schrumpfausgleichseinrichtung für eine Stranggießkokille
US4545423A (en) * 1983-05-10 1985-10-08 Hazelett Strip-Casting Corporation Refractory coating of edge-dam blocks for the purpose of preventing longitudinal bands of sinkage in the product of a continuous casting machine
DE3431316C2 (de) * 1984-08-25 1986-01-16 Fried. Krupp Gmbh, 4300 Essen Führungseinrichtung an den Gießbändern einer Doppelbandstranggießkokille

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857637A (en) * 1955-05-31 1958-10-28 Olin Mathieson Casting apparatus
GB1015314A (en) * 1963-11-13 1965-12-31 Davy & United Eng Co Ltd Continuous casting
BE673310A (fr) * 1964-12-11 1966-04-01
DE2926181A1 (de) * 1978-06-29 1980-01-03 Hitachi Ltd Stranggiessvorrichtung

Also Published As

Publication number Publication date
US4664174A (en) 1987-05-12
JPS623856A (ja) 1987-01-09

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