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EP0158898A2 - Installation de coulée continue et son procédé de fabrication - Google Patents

Installation de coulée continue et son procédé de fabrication Download PDF

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Publication number
EP0158898A2
EP0158898A2 EP85103786A EP85103786A EP0158898A2 EP 0158898 A2 EP0158898 A2 EP 0158898A2 EP 85103786 A EP85103786 A EP 85103786A EP 85103786 A EP85103786 A EP 85103786A EP 0158898 A2 EP0158898 A2 EP 0158898A2
Authority
EP
European Patent Office
Prior art keywords
cooling
mold
continuous casting
cooling tube
cast
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.)
Granted
Application number
EP85103786A
Other languages
German (de)
English (en)
Other versions
EP0158898A3 (en
EP0158898B1 (fr
Inventor
Werner S. Horst
Bernardo P. Muellers
Hans Horst
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT85103786T priority Critical patent/ATE53313T1/de
Publication of EP0158898A2 publication Critical patent/EP0158898A2/fr
Publication of EP0158898A3 publication Critical patent/EP0158898A3/de
Application granted granted Critical
Publication of EP0158898B1 publication Critical patent/EP0158898B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/059—Mould materials or platings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/10—Supplying or treating molten metal

Definitions

  • the invention relates to a continuous casting device and a method for its production according to the preamble of claims 1 and 19 respectively.
  • graphite molds also have a major disadvantage.
  • the graphite material is not resistant to oxidation in the range above 550 ° C, its structure is very often provided with defects, imperfections, cracks, etc. and is also very sensitive to frictional stress caused by the hard strand shell. As a result, grooves are formed which increasingly impair the surface quality of the cast strands in the course of the continuous casting.
  • graphite molds are very sensitive to impact, bending and tensile stress.
  • a disadvantage of the previous systems is the warping of the coolers surrounding the graphite mold, which often occurs after a relatively short period of use.
  • the cooler bulges due to uncontrolled thermal stresses. This creates an air gap between the outer mold wall and the cooler, which greatly reduces the cooling capacity and thus the casting capacity.
  • mold wear is a major factor in manufacturing cost accounting.
  • proportionate mold costs are currently at least DM 0.10 per kg of cast iron produced.
  • a mold which is divided into two or three parts in the longitudinal direction is known, the overall length of which is relatively large due to the different conditions. This is because only a small amount of heat is to be dissipated below the crucible bottom in the first mold section and a large proportion of the heat in the subsequent section for cooling. In addition, these molds have not proven themselves in this respect, since only very poor casting results can be achieved if graphite is not used.
  • the object of the invention is therefore to overcome the disadvantages of the prior art and to provide a continuous casting device and a method for its production, the manufacturing costs of the mold being significantly minimized, the time required for production reduced and the quality of the cast products in use Mold is significantly improved in terms of dimensional accuracy, surface quality and physical properties compared to conventional continuous casting products.
  • the object is achieved according to the device according to the features specified in the characterizing part of claim 1 and with regard to the method according to the features specified in the characterizing part of claim 19.
  • Advantageous embodiments of the invention are specified in the subclaims.
  • metals and metal alloys can be optimally continuously cast, the mold being split and the upper feed part being thermally insulated from the cooling part which follows in the direction of strand transport, the cooling surface formation and, above all, the geometric shape of the mold and the independent one Temperature control are essential to the invention.
  • the cast strands produced with the continuous casting apparatus according to the invention have a fine-wave, uniform, matt, glossy surface without the longitudinal striations that increasingly appear after a more or less long casting time in solid graphite molds.
  • a separate cooling tube is provided inside the body of the cooling mold, which contains the release agent comprising at least graphite.
  • the increasing distance between the cooling tubes and the inner cooling jacket means that, in cooperation with the coolant temperature on the cooling tubes, which increases steadily from the inlet side to the outlet side, the wall temperature of the cooling part of the mold from the strand outlet side to the strand inlet side analogously increases.
  • the surface of the cooling mold or the internal cooling tube is also machined and additionally provided with a lubricant and separating agent, which also comprises graphite.
  • FIG. 1 shows a lower part of a holding crucible or furnace in which a melt 2 is located.
  • a feed part 4 of a continuous casting mold 7a is fitted, which is suitable for the continuous casting of solid profiles.
  • the feed part 4 which consists of low heat-conducting, refractory material that is not attacked or only slightly attacked or wetted by the melt, channels 15 are incorporated in a known manner, through which the liquid melt enters the cooling part of the cooling mold 7.
  • the feed part 4 of the continuous casting mold 7a is with the cooling mold 7 by known components such as. B. a conical or cylindrical seat 5 and dowel pins 8 or else connected to a suitable conical or cylindrical thread, wherein insulating seals 6 are also provided for sealing the liquid melt.
  • the cooling part 7 of the mold consists of a cast body 10 made of highly thermally conductive material, which at the same time comprises cooling spirals 9 and an inner cooling tube 13 made of highly thermally conductive, high-strength metal in the form of a shrink connection.
  • the inner tube has the shape of a rotational paraboloid and has the surface formation typical of the method, as can be seen from FIGS. 3, 4 and 5.
  • a coolant inlet or outlet is designated 11 and 12.
  • Insulating seals of the crucible, with respect to the upper part of the cooling mold 7 are denoted by 14.
  • thermocouples 16 and 17 are firmly cast in, by means of which the temperature at the inlet or outlet end of the cooling mold 7 is measured and with the aid of which the coolant temperature and quantity can be regulated. Details of the relationship of the crucible, as well as the arrangement and insulation, are not shown in detail since they are of no importance for the invention.
  • FIG. 2 in which an embodiment of a continuous casting installation according to the invention is shown in a further exemplary embodiment, as is particularly suitable for the casting of larger hollow cross sections or hollow profiles.
  • the feed part 4 of the continuous casting mold 7a sits here in the opening or bore 3 of a highly refractory insert la of the furnace floor 26, which is insulated against the lower part 28 of the steel structure of the furnace floor by an insulating layer 27.
  • the feed part 4 is as in
  • Figure 1 provided with a conical seat 5 and dowel pins 8 and isolated and sealed by means of insulating seals against the cooling mold 7. With 14 an insulating seal of the opening 3 against the cooling part 7 of the mold 7a is designated.
  • the feed part 4 consisting of low heat-conducting material that cannot be wetted by the melt takes place through a precisely centered element, e.g. B. a tapered thread 22 on the refractory insert 21, on which a thread 24 and the centering 23, a hollow casting mandrel 25a which has proven to be advantageous, is fastened.
  • this hollow casting mandrel 25a can also consist of a highly refractory, non-wettable material with self-lubricating and / or separating properties, the thermal expansion of which is equal to or greater than that of the insert 21.
  • the casting mandrel 25a is also formed in two parts like the mold and comprises the upper insert 21 and the lower part 25 fastened underneath.
  • the cooling mold 7 or, in the case of a design with an internal cooling tube 13 at least this one made of iron or copper alloy with integrated finely divided release agent is produced in a solid dispersion.
  • Iron alloys with an addition of carbon are particularly suitable for this purpose, for example an iron alloy with 2 to 3.2% C, 0.4 to 2.2% Si and 15 to 25% Cr.
  • the carbon is present as a fine-laminar graphite in a pearlitic matrix, whereby graphite crystals are also provided in this heat-resistant gray cast iron in addition to the graphitically precipitated carbon as an alloy component in an evenly finely distributed form.
  • the separating agent is used in grain sizes between 0.01 and 0.5 mm, which is ultimately preferably statistically predominantly oriented in the cooling tube or in the cooling mold 7 with its preferred sliding plane parallel to the longitudinal axis of the inner cooling tube.
  • FIG. 7 shows in vertical section a heat-resistant molded body 50 with an internal molded body half 50a and an external molded body half 50b.
  • the arrangement is such that the two molded body halves 50a and 50b can rotate relative to one another, for example such that the inner molded body half 50a rotates while the outer molded body half 5.0b is stationary.
  • the rotating molded body half in the exemplary embodiment shown the inner one, is furthermore - as can be seen in detail from FIG. 8 - provided with vertical ribs 53, whereby slightly wedge-shaped gaps remain, the meaning of which will be discussed below.
  • a corrector is used to create the cooling tube 13 poured alloy with a temperature above the liquidus line, preferably a temperature which is only slightly above the liquidus line.
  • the release agent is then added to the inner molded body half 50a with constant rotation of at least one shaped body half, the above-mentioned admixture being used in particular using graphite as a powdery release agent, the grain spectrum also being at least 70% between 0.01 and 0. Should be 5 mm.
  • the temperature is lowered below the liquidus line. The rotation results in a uniform distribution of the release agent, since the pulp-like alloy is carried along in particular by the ribs 53 of the inner molded body half 50a.
  • the centrifugal forces also have the effect that, on the one hand, the lighter release agent components diffuse inward due to the centrifugal forces and thus come to rest with a higher density on the inner surface of the inner cooling tube 13.
  • the density of the release agent parts with a low specific weight increases due to gravity from bottom to top.
  • the thyxotropic behavior - similar to a sludge - of the supercooled alloy reduces the separation through buoyancy and centrifugal force. This also results in connection with the above-mentioned advantages that the sliding and separating properties are improved due to the denser attachment of the release agent bodies to the inner surface of the cooling mold.
  • the location, the distribution and orientation of the lubricant body, so z. B. control the graphite crystals by appropriate optimal choice of the temperature of the speed and the cooling intensity in a wide range.
  • the ribs 53 not only create the above-mentioned orientation and condensed accumulation of the finely divided release agent particles in the cooling mold to be produced, but above all also an improved and increased heat transfer surface to achieve a shrink connection. If the outer molded body half 50b is also insulated or heated accordingly, slow cooling of the melt can be achieved in a targeted manner. Since the release agent has a much lower thermal expansion than the surrounding metal alloy, the sliding and separating particles are shrink-wrapped by the metal alloy as it cools down.
  • the pouring into the rotary casting mold can also take place from top to bottom through a partially hollow internal molded body 50a (casting mandrel) which at the same time serves in its lower part as a brake core and ejector.
  • the inner cooling tube 13 is shrunk onto its refractory jacket, the hollow core serving as the inner molded body 50a then being pushed off from the cooling tube 13 thus produced. Due to the shrinkage process, the hollow core will be destroyed, especially in the case of larger dimensions.
  • the separating agent which essentially consists of graphite, can also be introduced beforehand into the liquid iron or copper alloy, for example, at a temperature above the liquidus line before it is poured into the moldings.
  • the release agent is thus internally deposited with an increased concentration on the cooling mold or on the cooling pipe, so that sufficient sliding properties can be achieved.
  • Some of these can be improved by etching the inner surface of the cooling mold 7 or the cooling tube 13, the graphite portions emerging from the pearlitic matrix by this etching process. Surface treatment is also possible and sometimes useful.
  • FIGS. 3 to 5 show greatly enlarged sections (approx. 10: 1) of the process-typical surfaces of the cooling surfaces of the mold (or the inner cooling tube 13), as can be seen after processing and coating, that is to say in the ready-to-cast state appearance.
  • the hollow part 25 of the casting mandrel 25a can also be provided with this surface.
  • FIG. 3 illustrates a surface typical of the method, such as is obtained by preparing the surface according to the invention by cutting a multi-thread saw or tooth thread with a low pitch after smoothing and applying the separating layer, in 10x magnification.
  • the thickness or thickness of the shrinked cooling tube 13 and the depth of the thread turns after the smoothing process, in particular grinding, are illustrated by 43. With 31 the valleys fully pressed with the release agent are designated, while with 32 the raised, ground thread tips are shown. In all three enlarged representations, the counter-conicity appears to be greatly exaggerated due to the shape of the paraboloid of revolution according to the invention.
  • the reference number 13 shows the inner cooling pipe with the saw thread threads cut in crosswise fashion (left and right) with an incline of approximately 15 °.
  • the area 31 filled with the separating agent predominates by far the surface of the stubbed truncated pyramids 32, the flanks of which are deliberately more and more rounded by the grinding and polishing process according to the manufacture, by the subsequent hard chrome plating and by use, until a state is reached which not changed or hardly changed.
  • Figure 5 illustrates a ready-to-cast surface as it results from cords.
  • the thickness of the inner mold tube which in practice is between 3.5 and about 16 mm, depending on the starting diameter and the alloy to be cast, is again indicated at 43.
  • Reference number 32 in turn relates to the remaining truncated cones and reference number. 31 the cooling surface occupied by the release agent.
  • thermocouples cast on the strand entry and exit sides regulate the amount of coolant according to the prin zip of the differential control can be made so that the casting speed is controlled and optimized solely according to the strand exit temperature.
  • Softened water is particularly suitable as a coolant, which is fed to the cooling coils of the mold depending on the temperature difference - as explained above - in such an amount and temperature that the coolant is on its way in countercurrent through the coil of the mold evaporated according to the forced flow principle and heated in the upper turns to the desired, controllable, optimal temperature.
  • an amount of coolant adjusted to idle value is first conveyed by the control system through the cooling coils, whereby the mold wall heats up to the desired operating temperature very quickly and without any signs of condensation, and then increases as the casting speed increases.
  • the required amount of coolant can be readjusted infinitely depending on the increasing temperature values using the differential control described above.
  • cooling coils mentioned can be provided in a single-thread manner in the case of smaller molds, but can also be wound in a multi-thread manner in the case of larger ones.
  • FIG. 6 a hollow punch 45 with openings 47 for the exit of the release agent is shown in part and schematically, via which the cooling tube 13 or, if the mold is used without a cooling tube, the surface of the cooling mold 7 itself is appropriately surface-treated.
  • the desired controllable temperature control can be achieved by means of the feed pump 49 shown in FIG.
  • a graphite ring can be used up to the height of the mold 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP85103786A 1984-04-13 1985-03-29 Installation de coulée continue et son procédé de fabrication Expired - Lifetime EP0158898B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85103786T ATE53313T1 (de) 1984-04-13 1985-03-29 Stranggiessvorrichtung und verfahren zu deren herstellung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3414066 1984-04-13
DE3414066 1984-04-13
DE3431622 1984-08-29
DE3431622 1984-08-29

Publications (3)

Publication Number Publication Date
EP0158898A2 true EP0158898A2 (fr) 1985-10-23
EP0158898A3 EP0158898A3 (en) 1987-04-29
EP0158898B1 EP0158898B1 (fr) 1990-06-06

Family

ID=25820396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103786A Expired - Lifetime EP0158898B1 (fr) 1984-04-13 1985-03-29 Installation de coulée continue et son procédé de fabrication

Country Status (4)

Country Link
US (1) US4665969A (fr)
EP (1) EP0158898B1 (fr)
CA (1) CA1256264A (fr)
DE (1) DE3578045D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3714139A1 (de) * 1987-04-28 1987-10-22 Werner S Horst Stranggiessvorrichtung
CN110842048B (zh) * 2019-11-27 2021-05-28 杭州富通电线电缆有限公司 一种生产铜杆的方法及铜杆拉丝装置

Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
US6216829B1 (en) * 1998-12-31 2001-04-17 Hayes Lemmerz International, Inc. Rotor with tubular vent ducts
US7264464B2 (en) * 2003-06-09 2007-09-04 Husky Injection Molding Systems Ltd. Cooling tube with a low friction coating
CN101137453B (zh) * 2005-03-10 2012-09-05 Sms西马格股份公司 用于制造连铸结晶器的方法和连铸结晶器
DE102009037283A1 (de) * 2009-08-14 2011-02-17 Kme Germany Ag & Co. Kg Gießform
US9744588B2 (en) * 2011-02-25 2017-08-29 Toho Titanium Co., Ltd. Melting furnace for producing metal
US10391548B2 (en) * 2015-06-25 2019-08-27 Nissan Motor Co., Ltd. Casting device and casting method

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3714139A1 (de) * 1987-04-28 1987-10-22 Werner S Horst Stranggiessvorrichtung
WO1988008344A1 (fr) * 1987-04-28 1988-11-03 Horst Werner S Dispositif de coulee continue
AU640342B2 (en) * 1987-04-28 1993-08-26 Werner S. Horst Horizontal continuous caster
CN110842048B (zh) * 2019-11-27 2021-05-28 杭州富通电线电缆有限公司 一种生产铜杆的方法及铜杆拉丝装置

Also Published As

Publication number Publication date
US4665969A (en) 1987-05-19
DE3578045D1 (de) 1990-07-12
EP0158898A3 (en) 1987-04-29
CA1256264A (fr) 1989-06-27
EP0158898B1 (fr) 1990-06-06

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