EP3083103B1 - Moule de coulée pour couler de l'acier en fusion - Google Patents

Moule de coulée pour couler de l'acier en fusion Download PDF

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Publication number
EP3083103B1
EP3083103B1 EP14821067.7A EP14821067A EP3083103B1 EP 3083103 B1 EP3083103 B1 EP 3083103B1 EP 14821067 A EP14821067 A EP 14821067A EP 3083103 B1 EP3083103 B1 EP 3083103B1
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EP
European Patent Office
Prior art keywords
casting
surface texture
casting mould
mold
melt
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.)
Active
Application number
EP14821067.7A
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German (de)
English (en)
Other versions
EP3083103A1 (fr
Inventor
Evgeny BALICHEV
Matthias Dresler
Markus Thomasky
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
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Publication date
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Publication of EP3083103A1 publication Critical patent/EP3083103A1/fr
Application granted granted Critical
Publication of EP3083103B1 publication Critical patent/EP3083103B1/fr
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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
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/057—Manufacturing or calibrating the 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
    • B22D11/04—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
    • 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
    • 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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal

Definitions

  • the invention relates to a casting mold for casting molten steel to a continuous withdrawn strand, wherein on at least one of the melt to be cast facing inner surface of the casting mold a surface texture is formed, which extends at least over the region of the mold, which in operation with on in the Molded molten pool of floating slag is wetted.
  • molten steel from a ladle is filled into a distributor, also referred to as a tundish, which is provided as a buffer and optionally for distributing the melt onto a plurality of strands, and from there via a dip tube into the respective casting mold.
  • a distributor also referred to as a tundish
  • the casting direction corresponds to the gravity effect.
  • the strand is formed.
  • the solidification of the melt sets in contact with the cooled inner surfaces of the casting mold, so that the casting mold from the casting in the still emerging in the vertical direction strand has on its outer sides a thin shell of solidified steel, which is still liquid melt in the interior of the strand circumscribed.
  • the strand After leaving the mold, the strand is in one so-called "pouring arc" deflected by rollers in a horizontal conveying direction. In this case, in the region of the casting arc, a specifically controlled cooling takes place in order to bring about controlled solidification of the strand. From the conveyed away in the horizontal direction and completely solidified strand slabs are then divided, which are fed to further processing.
  • pouring arc deflected by rollers in a horizontal conveying direction.
  • the mold casting powder is sprinkled on the free surface of the melt to form slag.
  • the slag covers the melt and prevents the reaction of the melt with the ambient atmosphere in the area of the so-called “casting mirror".
  • the slag binds in the melt ascending impurities and serves as a lubricant between the solidifying shell of the steel strand and the mold.
  • the latter technique is mainly used in billet or round casting.
  • the mold is oscillatingly moved to prevent caking of the steel on the cooled walls of the mold and to promote the removal of the forming strand from the mold.
  • Continuous casting molds may be composed of mold plates or made as a single piece.
  • the inner sides of the continuous casting molds are usually made of copper.
  • To improve their wear resistance can be their with the molten steel and the forming strand coming into contact inner surfaces with a nickel coating be occupied ( EP 0 125 509 B1 ).
  • the nickel coating results in a significant reduction in heat dissipation. Therefore, it is usually attached only at a certain distance from the distributor of the continuous casting machine associated upper mold edge.
  • the molten steel is cooled particularly quickly, especially in the region of the casting mirror. With sensitive steel grades, this can lead to surface defects due to the residual stresses arising during the cooling process.
  • the forming in the mold strand shell should be thin longer stay and be pressed by the increasing with increasing distance from the bath level increasing ferrostatic pressure uniformly to the copper plate of the continuous casting mold.
  • the roughening of the mold surface is carried out so that the machining depth of the roughness of the mold inner surface decreases in the casting direction, so that the roughened smooth part of the mold a gradual transition and thus a gradual transition from throttled to unthrottled heat flow is achieved.
  • An advantage is thereby seen that the macrostructure of the inner mold surface can be produced by methods known per se, such as Shot Blast Texturing (SBT), Electric Discharge Texturing (EDT), Electron Beam Texturing (EBT), Laser Texturing (LT) or through a perforated texture (FIG. GLT) or by other methods.
  • a casting mold in which an irregular structure is introduced into the Kokilleninnen Structure extending from the upper edge of the mold over a height of 20 - 150 mm and thereby has depressions whose diameter is 0.1 - 3 mm and whose depth is 5 - 300 microns.
  • the depressions are introduced into the surface of the mold by material-removing methods, such as etching, shot peening or laser machining.
  • the invention was based on the object to provide a casting mold, which is ensured by simple means an optimal solidification behavior in the critical with respect to the risk of cracking region of the casting mold.
  • a surface texture is formed in at least one of the inner surfaces of the casting mold facing the melt to be cast, in accordance with the prior art described at the outset.
  • the surface texture extends at least over the region of the mold, which is wetted during operation with slag floating on the melt poured into the mold.
  • this surface texture is now formed as a closed structure with closed, stochastically distributed depressions.
  • the heat transfer between the mold and the liquid melt decreases. It occupies one Part of the solidifying slag, the depressions of the stochastic surface structure and there adheres, unlike in open surface structures formally. In this way, the adhering to the inner mold surface slag acts as a thermal insulation, which prevents direct contact of the melt with the inner surface.
  • This heat-insulating effect of the slag layer leads to a lower and over the mold width homogeneous heat dissipation in G faux Spiegel Symposium.
  • the average roughness Ra and the average roughness Rz are important for characterizing this surface structure. Both the average roughness Ra and the mean roughness Rz are to be determined in accordance with DIN EN ISO 4287. In a surface structure according to the invention, the average roughness Ra is 10 to 50 ⁇ m and the average roughness Rz is 80 to 250 ⁇ m. In the case of average roughness values and average roughness in these value ranges, the maximum reduction in surface defects and stable process reliability result. This is particularly true when the average roughness Ra is 10 to 50 ⁇ m, in particular 15 to 50 ⁇ m.
  • Optimal adhesion of the slag to the surface texture is obtained when the maximum depth of the surface texture depressions is 500 ⁇ m. At least the depth of the wells should be 5 microns in order to achieve the desired roughness safely.
  • Casting molds of the type in question are usually made of a non-ferrous metal alloy, which is usually cooled on the side facing away from the melt.
  • the mold cross-section can be made square or rounded.
  • at least one of the narrow sides of the mold opening delimiting plates can be adjustable in the width direction ( EP 0 985 471 A1 ).
  • the surface structure provided according to the invention is provided at least at one of the inner surfaces delimiting the casting mold openings. This of course includes the possibility to mold a corresponding surface structure on all or at least opposite inner surfaces of the casting mold. Even with width-adjustable casting molds, the surface texture structured according to the invention should be present on at least one of the inner surfaces.
  • the surface texture extends over the width of the inner surface provided with it, via which the inner surface comes into contact with the melt to be cast, if the smallest thickness or Width of the casting mold is set.
  • the surface texture structured according to the invention should extend at least over the area of the respective inner surface of the casting mold, which is wetted by the slag covering the casting level in the casting operation.
  • Casting molds used today have proven to be effective if the surface texture extends over a region which, measured in the casting direction, begins at a distance of at least 10 mm below the upper mold edge and ends at a distance of at most 600 mm.
  • the inner surface provided with the surface structure is covered with a nickel layer over a section beginning at a distance from the mold top edge, it has proved to be particularly favorable with regard to the reduction of surface defects of the cast strand, if the surface texture formed according to the invention is that of the Kokillenoberkante associated edge region of the nickel layer overlaps. In practice, overlapping areas have proven to be at least 50 mm, measured in the casting direction. The overlap of the surface texture of the invention with the nickel coating avoids a hard fracture of the thermal conductivity in the transition from the non-coated to the nickel-coated portion of the respective inner surface.
  • the structure according to the invention of the surface texture provided on the respective mold surface can be introduced into the surface by embossing (pressure) or by a shock or impact pulse, for example by needling.
  • the introduction of the structure takes place by a deformation of the mold surface, without material being removed.
  • the work hardening caused by the striking or pressing load on the respective mold inner surface can contribute to a higher mold life.
  • a stamping process is used, a negative of the structure to be produced is first applied to a matrix, a ball or a roller. With this negative then the surface structure, depending on pressure and tool surface, applied to the mold. If the structure is generated by a method which is based on a shock or impact pulse is generated by a high impulse to the respective striking tool the inventively given structure. For this purpose, the so-called “needles” with which, for example, in the DE 199 07 827 A1 specifically to produce surface roughness.
  • molten steel M For casting a molten steel M into a strand S in the in Fig. 1 illustrated, constructed in a conventional manner continuous casting 1, the molten steel M is transported in a pan 2 to a manifold 3 and filled via a shadow tube 4 in the manifold 3. To a bottom outlet of the manifold 3, a further vertically aligned dip tube 5 is connected, which can be closed and regulated by a plug 6.
  • the molten steel M flows into a casting mold 7, which consists of cooled plates 8, 9, 10, 11 composed of a non-ferrous metal or a non-ferrous metal alloy.
  • a casting mold 7 which consists of cooled plates 8, 9, 10, 11 composed of a non-ferrous metal or a non-ferrous metal alloy.
  • copper or copper alloys are used.
  • the casting mold 7 has a substantially rectangular in plan view opening cross-section whose broad sides each bounded by a wide mold plate 8.9 and its narrow sides in each case by a narrow mold plate 10, 11.
  • the mold plates 8 - 11 can often be covered with a nickel layer 14 which begins at a distance variable to the mold top 3 of the mold mold 7, as measured in the vertically aligned conveying direction F of the molten steel M.
  • the distance A1 in the present case is 300 mm, but can generally be made variable.
  • a rectangular mold with a nickel layer is used here.
  • other molds with different coatings are conceivable.
  • the strand S forming in the casting mold 7 from the molten steel M emerges from the casting mold 7 in a vertically oriented conveying direction F and is guided via a pouring arc 16 into a horizontally oriented conveying direction Fh. In the region of the pouring arc 16, the strand S is guided on rollers 19, 20. At the same time there is an intensive cooling, so that the strand S at the end of the casting arc 16 largely completely solidified and can be fed to the further processing.
  • a surface texture 22 is formed on the inner surfaces 13 of the mold plates 8-11 delimiting the mold opening 12.
  • the surface texture 22 begins in this embodiment in the conveying direction F at a distance A2 of 10 mm and ends at a distance A3 of 400 mm from the mold top 15 away. Accordingly, the surface texture 22 overlaps the nickel layer 14 in an overlapping area Ü over a length of 100 mm measured in the conveying direction F. In general, the surface texture can also be introduced as far as a distance A3 of 600 mm from the mold top edge 15. In the section covered by the surface texture 22, the slag K floating in the casting operation on the casting mirror of the melt M to be cast wets the inner surface 13 of the copper plates 8-11.
  • the surface texture 22 is formed by a plurality of depressions 23, which are each completely surrounded by a web 24.
  • Each of the webs 24 defines two recesses 23 arranged adjacent to one another.
  • the recesses 23 can be formed as a single hole-like indentations having a substantially round opening cross-section or from several such merging into each other impressions, which are then in turn bounded by a self-contained around the respective recess 23 web 24.
  • Material suspensions such as those produced in the shot peening process, are undesirable in this structure, since these suspensions are removed from the strand shell. A regression of the structure with reduction of the roughness characteristics would be the result. Rather, be Recesses introduced into the mold material to achieve a work hardening and to maintain the surface structure.
  • the width B of the surface texture 22 is restricted to the narrowest region which, when the mold plates 10, 11 delimiting the mold opening 12 on their narrow sides, are adjusted in the width direction, from the copper plates 10 , 11 is not overstretched.
  • the average surface roughness Rz and center roughness Ra determined for two surface textures generated in this way inside and outside the overlapping area of surface texture 22 and nickel layer 14 of the inner surfaces 13 are shown in Table 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (10)

  1. Moule de coulée destiné à couler de l'acier en fusion (M) en une ligne de coulée (S) démoulée en continu, une texture de surface (22) étant façonnée au niveau d'au moins une surface intérieure (13) du moule de coulée (7) qui fait face à la matière fondue (M) à couler, laquelle s'étend au moins sur la zone (A3) du moule de coulée (7) qui, en fonctionnement, est mouillée par la scorie (K) qui flotte sur la matière fondue (M) coulée dans le moule de coulée (7), la texture de surface (22) étant réalisée sous la forme d'une structure fermée avec des creux (23) à délimitation fermée distribués de manière stochastique, caractérisé en ce que la valeur de rugosité moyenne Ra de la texture de surface (22) est de 10 à 50 µm et la moyenne calculée de la profondeur de rugosité Rz de la texture de surface (22) est de 80 à 250 µm.
  2. Moule de coulée selon la revendication 1, caractérisé en ce que la texture de surface (22) s'étend sur une zone qui, respectivement mesurée dans le sens de la coulée (F), commence à une distance (A2) d'au moins 10 mm au-dessous du bord supérieur du moule (15) et se termine à une distance (A3) maximale de 600 mm.
  3. Moule de coulée selon l'une des revendications précédentes, caractérisé en ce que la profondeur maximale des creux (23) de la texture de surface (22) est de 500 µm.
  4. Moule de coulée selon l'une des revendications précédentes, caractérisé en ce que le moule de coulée (7) possède une section transversale d'ouverture polygonale ou arrondie et en ce que la texture de surface (22) est formée au moins au niveau de l'une des surfaces intérieures (13) du moule de coulée (7) qui délimite la section transversale d'ouverture au niveau de l'un de ses côtés larges.
  5. Moule de coulée selon la revendication 4, caractérisé en ce que le moule de coulée (7) est réglable en largeur par coulissement d'au moins l'un de ses côtés étroits (10, 11) et en ce que la texture de surface (22) s'étend sur la largeur (B) de la surface intérieure (13) qui en est pourvue, avec laquelle entre en contact la surface intérieure (13) avec la matière fondue (M) à couler lorsque la plus petite largeur (B) du moule de coulée (7) est réglée.
  6. Moule de coulée selon l'une des revendications précédentes, caractérisé en ce que la texture de surface (22) est pratiquée dans la surface intérieure (13) respective du moule de coulée (7) par un usinage frappant.
  7. Moule de coulée selon la revendication 6, caractérisé en ce que la texture de surface (22) est pratiquée dans la surface intérieure (13) par des aiguilles.
  8. Moule de coulée selon l'une des revendications précédentes, caractérisé en ce que la texture de surface (22) est estampée dans la surface intérieure (13) respective du moule de coulée (7).
  9. Moule de coulée selon l'une des revendications précédentes, caractérisé en ce que la surface intérieure (13) pourvue de la texture de surface (22) est occupée par une couche de nickel (14) sur une portion qui commence à une distance (A1) du bord supérieur du moule (15) et en ce que la texture de surface (22) chevauche une zone de bordure (Ü) de la couche de nickel (14) qui est associée au bord supérieur du moule (15).
  10. Moule de coulée selon la revendication 9, caractérisé en ce que la texture de surface (22) chevauche la couche de nickel (14) sur au moins 50 mm, mesurés dans le sens de la coulée (F).
EP14821067.7A 2013-12-18 2014-12-16 Moule de coulée pour couler de l'acier en fusion Active EP3083103B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013114326.1A DE102013114326A1 (de) 2013-12-18 2013-12-18 Gießkokille zum Vergießen von Stahlschmelze
PCT/EP2014/003374 WO2015090564A1 (fr) 2013-12-18 2014-12-16 Moule de coulée pour couler de l'acier en fusion

Publications (2)

Publication Number Publication Date
EP3083103A1 EP3083103A1 (fr) 2016-10-26
EP3083103B1 true EP3083103B1 (fr) 2019-10-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14821067.7A Active EP3083103B1 (fr) 2013-12-18 2014-12-16 Moule de coulée pour couler de l'acier en fusion

Country Status (11)

Country Link
US (1) US20160311014A1 (fr)
EP (1) EP3083103B1 (fr)
JP (1) JP2016540649A (fr)
KR (1) KR20160099641A (fr)
CN (1) CN105828977A (fr)
CA (1) CA2934379A1 (fr)
DE (1) DE102013114326A1 (fr)
MX (1) MX2016007791A (fr)
RU (1) RU2016128990A (fr)
WO (1) WO2015090564A1 (fr)
ZA (1) ZA201603959B (fr)

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DE102017113600A1 (de) * 2017-06-20 2018-12-20 Vishay Electronic Gmbh Leistungswiderstand
CN114882045B (zh) * 2022-07-11 2022-09-20 山东金三星机械有限公司 一种用于铸件浇口铣削加工的工艺方法

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Publication number Publication date
MX2016007791A (es) 2016-09-29
JP2016540649A (ja) 2016-12-28
EP3083103A1 (fr) 2016-10-26
KR20160099641A (ko) 2016-08-22
CN105828977A (zh) 2016-08-03
CA2934379A1 (fr) 2015-06-25
DE102013114326A1 (de) 2015-06-18
US20160311014A1 (en) 2016-10-27
ZA201603959B (en) 2017-08-30
WO2015090564A1 (fr) 2015-06-25
RU2016128990A (ru) 2018-01-23

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