EP2049286B1 - Continuous casting mold for liquid metals, in particular for liquid steel materials - Google Patents

Description

The invention relates to a continuous casting mold for liquid metals, in particular for liquid steel materials, with surrounding for the supply and discharge of coolant from water tanks, the Gießquerschnitt parallel and / or curved course limiting Kokillenbreitseitenplatten and Kokillenschmalseitenplatten of copper materials, and a plurality of coolant channels for passing coolant, wherein the coolant channels in the Gießspiegelbereich have a minimum coolant channel cross-section while reducing the thickness of the respective Kokillenbreitseitenplatte, wherein when new, the thickness of Kokillenbreitseitenplatte as the distance between the hot side and the coolant channel reason as normal thickness (100%) is at least 20 mm, and wherein the thickness of the Kokillenbreitseitenplatte is formed in the region of the casting mirror relative to the normal thickness reduced.

Operating measurements on thin-strand plants have shown that the heat load of the continuous casting mold is distributed very unevenly over the mold surface. The area is particularly heavily loaded up to approx. 70 mm below the casting level. The measured at this point heat flux densities are many times greater than the average heat flux measured across the entire mold. Along the pouring mirror in the width direction, the heat flow density is also not homogeneously distributed. In the outer areas of Kokillenbreitseitenplatten multiply higher values than in the middle are achieved, which is due to the central arrangement of a dip tube.

In accordance with this very uneven distribution of the heat flow density, the temperature of the mold surface on the hot side, which is in contact with the liquid steel or the solidifying strand shell, is also considerably different. In addition to the negative consequences that can not be excluded for the cast strands (eg slab cross-sections or thin-strand cross-sections), the locally higher surface temperatures on the hot side of the mold also lead to higher wear in these areas, which can manifest itself in local distortions or in cracking. As soon as the wear occurring on the hot side of the mold exceeds a certain extent, the entire surface of the mold plate including the less stressed or usable surfaces must be reworked, which can only be done by milling or another cutting process.

The initially described continuous casting mold is from the DE 102 26 214 A1 known. The existing there from copper material cassette-like inserts rest on steel insert plates and can be replaced. The thickness of the copper plates between the coolant and the copper plate hot side is different across the width and / or height of the mold. The coolant channel cross-section is designed in the height in the Gießspiegelbereich as a minimum thickness and in the lower regions of the coolant channel cross-section is always larger, and the lower portion of the thickness of the copper plate is always made larger. All these measures can not prevent the above-described wear of the copper plates after a number of casts.

The publication DE 102 26 214 A1 describes a continuous casting mold for liquid metals, surrounded by water tanks steel inserts plates, and with these adjacent cartridge-like copper plates, in which coolant channels are incorporated. To counteract the high temperatures in the Gießspiegelbereich the device provides a suitable design of the copper plates and / or Stahleinatzplatten, wherein the thickness of the copper plates between the cooling medium and the copper plate hot side is different across the width and / or height.

The WO 00/41828 A1 shows a crystallizer for casting metal, with circular holes for passing a cooling liquid. The holes have a longitudinal axis which is substantially parallel to a longitudinal axis of the crystallizer over the entire height of the crystallizer.

In the DE 103 58 853 A1 is described a continuous casting mold made of copper or a copper alloy and a steel water tank, which is releasably connected to the mold plate. On the side facing the water tank, the mold plate is provided with running in the casting direction cooling channels for a cooling medium. The flow cross sections of the cooling channels are determined by releasably inserted patches.

The EP 0 931 609 B1 describes a liquid-cooled mold for a continuous casting, in which deep-mounted cooling grooves are arranged in the critically stressed area.

In the US Pat. No. 6,926,067 B1 is a liquid-cooled mold for a continuous casting described with a given Kokillenkörper, wherein cooling holes are arranged between the cooling channels.

The invention has for its object to reduce different heat loads of the continuous casting mold within the Kokillenbreitseitenplatte and thereby reduce wear.

This object is achieved with a continuous casting mold (1) for liquid metals, especially for liquid steel materials, with for the supply and discharge of coolant (1a) surrounded by water tanks, the Gießquerschnitt (1b) with parallel and / or curved course limiting Kokillenbreitseitenplatten (2) and Kokillenschmalseitenplatten (3) of copper materials, and a plurality of coolant channels (4) on the cold side of Kokillenbreitseitenplatten (2) and mold narrow side plates (3), wherein the coolant channels (4 ) in the Gießspiegelbereich (5) while reducing the thickness (6) of the respective Kokillenbreitseitenplatte (2) a minimum coolant channel cross-section (7), wherein when new, the thickness (6) of Kokillenbreitseitenplatte (2) as the distance between the hot side and the coolant channel -Through normal thickness (100%) is at least 20 mm, and in which the thickness (6) of Kokillenbreitseitenplatte (2) in the Gießspiegelbereich (5) is formed reduced compared to the normal thickness, and the coolant channel cross-section (7) in the Gießspiegelbereich ( 5) has a reduced cross-section. The invention is characterized in that the thickness (6) of the Kokillenbreitseitenplatte (2) in the Gießspiegelbereich (5) is reduced by at least 20% compared to the normal thickness, and for reducing the coolant channel cross-section (7) in the Gießspiegelbereich (5) and is formed up to the Kokillenausgang (9) by means of a respective fixed on the cold side adjustable filler (10) made of normal temperature resistant material.

Alternatively, the stated object is achieved by a continuous casting mold (1) for liquid metals, in particular for liquid steel materials, surrounded by for the supply and discharge of coolant (1a) of water tanks, the casting cross-section (1b) with parallel and / or curved course limiting Kokillenbreitseitenplatten (2) and Kokillenschmalseitenplatten (3) made of copper materials, and a plurality of coolant channels (4) on the cold side of Kokillenbreitseitenplatten (2) and Kokillenschmalseitenplatten (3), wherein the coolant channels (4) in Gießspiegelbereich (5) while reducing the thickness ( 6) of the respective Kokillenbreitseitenplatte (2) have a minimum coolant channel cross-section (7), wherein in the new state, the thickness (6) of Kokillenbreitseitenplatte (2) as a distance between the hot side and the coolant channel reason as normal thickness (100%) at least 20 mm is, and in which the thickness (6) of Kokillenbreitseitenplatte (2) is formed reduced in the Gießspiegelbereich (5) relative to the normal thickness, and at least the Kokillenbreitseitenplatten (2) are formed as cassette plates, which rest on the cold side aufbühlig on cooled adapter plates (14). It is characteristic that the thickness (6) of the Kokillenbreitseitenplatte (2) in the Gießspiegelbereich (5) is reduced by at least 20% compared to the normal thickness, and on the adapter plate (14) for forming the minimum coolant channel cross-section (7) an exchangeable displacement body (15) is provided, wherein the coolant channel cross-section (7) in the Gießspiegelbereich (5) is reduced by the displacement body (15).

As an example may be mentioned: In conventional mold plates for thin slab plants with a constant thickness, the thickness is usually 25 mm when new. This value is now reduced by at least 5 mm (20%) to 20 mm.

An embodiment of the invention provides that the displacement body is formed with different profiles, stored and exchangeably secured.

In the drawings, exemplary embodiments are shown, which are described in more detail below.

Fig. 1

eine perspektivische Darstellung der Stranggießkokille, die durch Weglassen der vorderen Kokillenbreitseitenplatte den Blick in das Innere freigibt, in das das Tauchrohr abgesenkt ist,

Fig. 2

einen ebenen , senkrechten Teilschnitt durch eine Kokillenbreitseitenplatte, der die Dicke(n) der Kupferplatte in Verbindung mit den Verhältnissen des Kühlmittelkanals über die Kokillenhöhe zeigt,

Fig. 3

den ebenen, senkrechten Teilschnitt wie Fig. 2 mit einer Adapterplatte und

Fig. 4

eine Ansicht gegen die Kaltseite der Kokillenbreitseitenplatte bei entferntem Füllstück bzw. bei entfernter Adapterplatte.

Show it:

Fig. 1

a perspective view of the continuous casting mold, which releases the view into the interior, in which the dip tube is lowered by omitting the front Kokillenbreitseitenplatte,

Fig. 2

a plane, vertical partial section through a Kokillenbreitseitenplatte showing the thickness (n) of the copper plate in conjunction with the ratios of the coolant channel on the mold height,

Fig. 3

the flat, vertical section like Fig. 2 with an adapter plate and

Fig. 4

a view against the cold side of Kokillenbreitseitenplatte with removed filler or with the adapter plate removed.

The continuous casting mold 1 ( Fig. 1 ) is formed by two Kokillenbreitseitenplatten 2 limiting the casting cross section 1b and by Kokillenschmalseitenplatten located at the ends 3, wherein a coolant 1a (such as water) under pressure through coolant channels 4 ( Fig. 2 to 4 ) to be led. As can be seen, 5 different areas 5a and 5b of the heat flux density are formed by the influence of a dip tube 12 in Gießspiegelbereich. The heat flux density in the regions 5a is higher than in the region 5b. In addition, due to the emerging from the dip tube 12 liquid steel flows also different heat flux densities, which also occur in a funnel-shaped extension 11 of Kokilleneingangs. These different heat flux densities must be compensated by cooling measures. For this purpose, the thickness 6 of Kokillenbreitseitenplatte 2, which is usually in the new state between 20 to 40 mm or more, to be set as the usual standard thickness of 100%. For this reason, the corrected new condition in the area of the pouring mirror, as shown, is only 80%. These measures are applicable to all currently used designs of a so-called. CSP funnel mold and conventional mold plates. Here can be reduced by stronger milling the minimized coolant channel cross section 7 between the hot side and the coolant in Gießspiegelbereich 5.

In Fig. 2 is the coolant channel cross-section 7 in Gießspiegelbereich 5 and to Kokillenausgang 9 each formed by a fixed on the cold side filler 10 made of normal temperature resistant material. The filler can be adjustable at least to reduce the coolant channel cross-section 7.

Fig. 3 shows a design of the continuous casting mold 1 for a two-part cassettes mold, again the Gießspiegelbereich 5 is shown with the region 5a of the higher heat flux density in the casting direction 13 within the funnel-shaped extension 11. The so-called cassette mold consists essentially of the Kokillenbreitseitenplatte 2 described above and a rear adapter plate 14, between which the coolant passage 4 extends, through which the coolant is supplied and discharged 1a. Again, the individual coolant channels 4 can be milled deeper into the material in the area below the casting mirror 5. Correspondingly shaped displacement bodies 15 reduce the coolant channel cross section 7 and increase the coolant speed in this area.

In Fig. 3 At least the Kokillenbreitseitenplatten 2 are formed as cassette plates, which abaufähig on the cold side on cooled adapter plates 14, which need not necessarily consist of copper materials abut. In this case, a separate displacement body 15 is provided on the adapter plate 14 to form the minimum coolant channel cross-section 7. The displacer 15 is formed with different profiles and can be stored and exchangeable.

According to Fig. 4 are in the Kokillenbreitseitenplatte 2, the coolant channels 4 in the width direction 8 arranged in groups. Groups of different numbers of coolant channels 4 can be formed. Between the vertical rows of coolant channels 4 fastening threads 16 are arranged.

LIST OF REFERENCE NUMBERS

1

continuous casting

1a

coolant

1b

casting cross-section

2

Kokillenbreitseitenplatte

3

Kokillenschmalseitenplatte

4

Coolant channel

5

Meniscus (range)

5a

Area with higher heat flux density

5b

Range of lower heat flux density

6

Thickness of Kokillenbreitseitenplatte

7

minimized coolant channel cross section

8th

width direction

9

mold outlet

10

filling

11

funnel-shaped extension

12

dip tube

13

casting

14

adapter plate

15

displacement

16

mounting thread

Claims (3)

1. Continuous casting mould (1) for liquid metals, particularly for liquid steel materials, with mould wide-side plates (2) and mould narrow-side plates (3) of copper materials, which wide-side and narrow-side plates are surrounded by water tanks for the feed and discharge of coolant (1a) and bound the casting cross-section (1b) with a parallel and/or curved course, and a plurality of coolant channels (4) at the cold side of the mould wide-side plates (2) and mould narrow-side plates (3), wherein the coolant channels (4) have in the casting surface region (5) a minimum coolant channel cross-section (7) with reduction of the thickness (6) of the respective mould wide-side plate (2),
   wherein in the new state the thickness (6) of the mould wide-side plate (2) is, as normal thickness (100%), at least 20 millimetres as a spacing between the hot side and the coolant channel base
   wherein the thickness (6) of the mould wide-side plate (2) in the casting surface region (5) is formed to be reduced by comparison with the normal thickness and
   wherein the coolant channel cross-section (7) in the casting surface region (5) has a reduced cross-section,
   characterised in that
   the thickness (6) of the mould wide-side plate (2) in the casting surface region (5) is reduced by at least 20% by comparison with the normal thickness and
   for the reduction of the coolant channel cross-section (7) this is formed in the casting surface region (5) and as far as the mould outlet (9) by means of a respective filler (10), which is adjustably fastened on the cold side, of material resistant to normal temperature.
2. Continuous casting mould (1) for liquid metals, particularly for liquid steel materials, with mould wide-side plates (2) and mould narrow-side plates (3) of copper materials, which wide-side and narrow-side plates are surrounded by water tanks for the feed and discharge of coolant (1a) and bound the casting cross-section (1b) with a parallel and/or curved course, and a plurality of coolant channels (4) at the cold side of the mould wide-side plates (2) and mould narrow-side plates (3), wherein the coolant channels (4) have in the casting surface region (5) a minimum coolant channel cross-section (7) with reduction of the thickness (6) of the respective mould wide-side plate (2),
   wherein in the new state the thickness (6) of the mould wide-side plate (2) is, as normal thickness (100%), at least 20 millimetres as a spacing between the hot side and the coolant channel base
   wherein the thickness (6) of the mould wide-side plate (2) in the casting surface region (5) is formed to be reduced by comparison with the normal thickness and
   wherein at least the mould wide-side plates (2) are constructed as cassette plates which on the cold side bear against cooled adapter plates (14) to be capable of demounting,
   characterised in that
   the thickness (6) of the mould wide-side plate (2) in the casting surface region (5) is reduced by at least 20% by comparison with the normal thickness and
   an exchangeable displacement body (15) is provided on the adapter plate (14) for forming the minimum coolant channel cross-section (7),
   wherein the coolant channel cross-section (7) is reduced in the casting surface region (5) by the displacement body (15).
3. Continuous casting mould according to claim 2, characterised in that the displacement body (15) is formed with different profiles.

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