EP1452253B1 - Optimised fastening of continuous casting mould plates - Google Patents

Abstract

Fixing device for mold plates of a continuous casting mold (1) comprises a number of screws (7) such as screw bolts fixed together. The horizontal distance (H) of the screws is less in the region (B) of the bath meniscus of the mold than the vertical distance (V) of the screws.

Description

The invention relates to an optimized attachment of mold plates of a continuous casting mold consisting of heat-conducting metal, in particular of a copper alloy, if necessary, with support plates on the outer surfaces, which between them cooling water channels limit and with each other or on water tanks with a variety screwed together by screws such as bolts or the like or are fastened.

In the prior art is usually the distribution of fastening threads for screwing with bolts in regular horizontal and vertical distances usual. For thin slab plants with high casting speeds cause the high temperature stresses caused thereby the working side in the bathroom mirror area of the mold plates to high loads in the bathroom mirror area and especially in high-strength copper materials to cracks, which lead to a short mold life. Furthermore, the Cracks in the mold plate lead to surface defects on the cast product.

The document DE 24 23 481 C2 describes a continuous casting mold with a lining made of thermally conductive metal, with a series of vertical ribs on the Outside surfaces of the lining and with support plates on the outside of the Lining are attached, with the ribs together with the support plates limit several parallel water flow channels, and some of the ribs provided with opposite, laterally directed lips are that are in contact with fasteners.

The fasteners are metal bands that carry bolts, and together with the ribs form additional water flow channels. there is provided that the additional water flow channels wider and are less deep than other water flow channels, and that all the channels same, over the entire channel length have constant hydraulic diameter.

The document DE-OS 21 54 101 describes a mold for the continuous casting of Metals in which the outside is enclosed by support plates. The Wall thickness of the mold plate is lower than that of the support plates. The support plates have on their inner surfaces webs, which limit cooling channels. The mold plates are supported by means of fastening members on the support plates. The Fasteners are stud bolts which are welded to the mold plate are interspersed and openings in the webs, with nuts from the outside engage the support plates in the studs.

The document GB 1,090,858 describes a continuous casting mold for continuous casting surrounded by metals, comprising a thin-walled heat-resistant insert from a back element. The back element comprises a plurality of back plates For example, a forging, these plates all around the inner Insert are attached and the required mechanical strength to the thin inner part transferred. There are inner and outer openings for the feeder provided by cooling liquid to the inner part by means of cooling channels, which in the outer surfaces of the insert or in the cooperating surfaces of the Milled back element.

Based on the aforementioned prior art, it is the object of the present Invention the thermally induced stress in the bathroom mirror area on the side of a mold plate facing the metal to be cast reduce and prevent the cracking and thus the mold life and to improve the quality of cast products.

The task is with the attachment of mold plates in the preamble of Claim 1 type solved in such a way that at least in the area of Bath mirror B of the mold at least locally the horizontal distance H of the fittings is smaller than the vertical distance V of the fittings.

Alternatively, the aforementioned object with the attachment of mold plates the type mentioned in the preamble of claim 3 solved in such a way that in the level of the bath level of the mold during the attachment of Kokillenplatten at least partially screwed connections for bolts omitted and to compensate for the lack of tension forces upper and / or below the level of the bath mirror additional thread arrangements or Fittings are provided. By this measure, the plate stress and stretching on the hot metal facing working side of the Chill plate reduced in critical Badspiegelbereich and thus the risk of and cracks reduced or avoided. The mold life and the continuous casting quality are significantly improved in particular high casting speeds.

Furthermore, the above-mentioned object in a mounting in the preamble From claim 4 mentioned type solved in such a way that in the plane of the bathroom mirror the mold at least partially screwed connections for bolts omitted and, alternatively, in the levels above and below the Level of the bath level relatively larger thread for correspondingly thicker Bolts are provided.

An embodiment of the invention further provides that for the compensation of in the level of the bathroom mirror attributable fittings a corresponding Number of bolts in double row in the first and or third level is arranged.

Further embodiments of the optimized mold plate attachment are in further claims provided.

Details, features and advantages of the invention will become apparent from the following Explanation of some schematically illustrated in the drawings embodiments.

Figur 1

in perspektivischer Ansicht schräg von oben eine Kokille mit Wasserkä- sten sowie mit einen Gießhohlraum ausbildenden Kokillenplatten in üb- licher Anordnung nach dem Stand der Technik;

Figur 2

eine Anordnung von Befestigungsgewinden nach dem Stand der Tech- nik in schematisierter Darstellung;

Figur 3 bis Figur 5

optimierte Kokillenplatten-Befestigungen nach der Erfindung mit Ver- schraubungen, deren horizontaler Abstand kleiner als der vertikale Abstand ist;

Figur 6

eine optimierte Kokillenplatten-Befestigung nach der Erfindung mit Wegfall der Verschraubungen im Badspiegelbereich und statt dessen eine zusätzliche Anordnung von schematisierten Schraubenbolzen in der ersten und dritten Befestigungsebene; eine zusätzliche Anordnung von schematisierten Schraubenbolzen in der ersten und dritten Befestigungsebene;

Figur 7

eine erfindungsgemäße Ausbildung der optimierten Befestigung von Kokillenplatten mit Wegfall der Verschraubungen im Badspiegelbereich und als Ersatz eine erhöhte Anzahl von Schraubenbolzen in der ersten und dritten Befestigungsebene;

Figur 8

eine weitere optimierte Befestigung von Kokillenplatten mit einer Kom- bination von Schraubenbolzen in Doppelreihe mit erhöhter Anzahl von Schraubenbolzen in verschiedenen Befestigungsebenen;

Figur 9

eine optimierte Befestigung anderer Art mit größeren Schraubenbolzen in der ersten und dritten Befestigungsebene als Ersatz für im Badspie- gelbereich wegfallender Verschraubungen;

Figur 10

eine weitere Art der Befestigung von Kokillenplatten, bereichsweise ei- nerseits mit Doppelreihen und andererseits mit Schraubenbolzen grö- ßerer Dimension;

Show it:

FIG. 1

in a perspective view obliquely from above, a mold with water boxes and with a casting cavity forming chill plates in the usual arrangement according to the prior art;

FIG. 2

an arrangement of fastening threads according to the prior art in a schematic representation;

FIG. 3 to FIG. 5

optimized mold plate fasteners according to the invention with screw connections whose horizontal distance is smaller than the vertical distance;

FIG. 6

an optimized chill plate attachment according to the invention with elimination of the screw in the bathroom mirror area and instead an additional arrangement of schematized bolts in the first and third mounting plane; an additional arrangement of schematic bolts in the first and third mounting plane;

FIG. 7

an inventive design of the optimized attachment of mold plates with elimination of the screw in the bathroom mirror area and as a replacement, an increased number of bolts in the first and third mounting plane;

FIG. 8

a further optimized fastening of mold plates with a combination of bolts in double row with increased number of bolts in different mounting planes;

FIG. 9

an optimized attachment of a different type with larger bolts in the first and third mounting plane as a replacement for in the bathroom mirror area omitted screwing;

FIG. 10

Another type of mounting of mold plates, in some areas with double rows on the one hand and on the other hand with bolts of larger dimension;

FIG. 1 shows a perspective view of a continuous casting mold 1 with mold plates 5, 6, which form a casting cavity F. The mold plates 5, 6 are via holes in the mounting planes E1 to E6 using Screw bolt 7 with the water boxes 8, 9 firmly in the known type and in particular thermally conductively connected. Here are also bolts 7 in the attachment plane E2, i. between the mounting planes E1 and E3 arranged in the area of the bathroom mirror. Especially with thin slab plants With high casting speeds, this type of attachment leads to the described Disadvantages. For clarity, Figure 2 shows the previous state of Technique with approximately even spacing between the fastening and connection fittings 7 in levels E1 to E6 including level E2 of Badspiegelbereiches. FIG. 2 is schematized in order to facilitate understanding Service.

Figures 3 to 5 show the attachment of mold plates according to the invention a continuous casting mold of a copper alloy with a plurality of schematized Screws 7, wherein at least in the region (B) of the bath mirror the Melt in the mold 1 at least locally the horizontal distance H of the fittings 7 is smaller than the vertical distance V of the fittings, such as this is shown in particular in Fig. 4. Particularly advantageous is the horizontal Distance H of the glands 7 about 50% to 80% of the vertical distance V of the fittings. As a result, the stress of the mold plates reduced and prevents cracking on the hot side of the mold plate.

The schematic FIG. 6 shows, as a further solution according to the invention, that the special kind of optimized fastening the strain of the plates reduced and cracking can be avoided and thus the Kokillenstandzeit and product quality is improved when the previous arrangement of Screw bolt (7) in the bathroom mirror area E2 omitted and instead additional Bolts (double rows 4/4) in the first and third levels E1 and E3 are arranged.

As shown in Figure 7 is a substitute for the elimination of the glands in the bathroom mirror area E2 an increased number of bolts 4, 4 in horizontal row of the levels E1 and E3 provided.

As shown in Figure 8, the solution of the invention Task is that in the plane E1, the bolts 4, 4 in denser number are arranged with smaller mutual distances, while in the plane E3 an increased number of bolts 4/4 in the form of a double row is trained.

Figure 9 shows another embodiment of the inventive principle, which It is that in the planes E1 and E3 instead of an increased number of fittings such 4+ glands with larger diameter and accordingly increased strength are arranged.

Finally, FIG. 10 shows another alternative of an optimized attachment of mold plates with partially executed as double rows Bolts 4/4 in planes E1 and E3 and with reinforced bolts 4+ in the middle area of the E2 plane.

From the previously explained and shown embodiments of the invention whose common operating principle is recognizable:

The endangered Badspiegelbereich u. a. in the plane E2 of the mold plates effectively relieved by removing tension forces, and the dropped ones Tension forces are in the upper and / or lower zone to the bath mirror area For example, the planes E1 and E3 shifts. This will effectively relieve the Tensioning forces in the plane E2 reaches the bathroom mirror area and thus the risk of damage and in particular of crack formation on the mold plates in this level E2 diminished until prevented. This will also be the Mold life increased at high casting speeds and the quality of the cast products, in particular thin slabs improved.

Claims (9)

1. A fastening arrangement for mould plates (5, 6) of a continuous casting mould (1) that consist of a heat conducting metal, particularly a copper alloy, and are provided, if applicable, with support plates on the outer surfaces, wherein cooling water channels are defined between said mould plates and the mould plates can be respectively braced relative to one another and mounted on water boxes (8, 9) with a number of screws (7), for example, screw bolts (7) or the like,
   characterized in that the horizontal distance (H) between the screws (7) is at least locally smaller than the vertical distance (V) between the screws (7) in the region (B) of the bath meniscus of the mould (1) (Figures 3-5).
2. The fastening arrangement for mould plates according to Claim 1,
   characterized in that the horizontal distance (H) between the screws (7) amounts to approximately 50-80% of the vertical distance (V) (Figure 5).
3. A fastening arrangement for mould plates (5, 6) of a continuous casting mould (1) that consist of a heat conducting metal, particularly a copper alloy, and are provided, if applicable, with support plates on the outer surfaces, wherein cooling water channels are defined between said mould plates and the mould plates can be respectively braced relative to one another and mounted on water boxes (8, 9) with a number of screws (7), for example, screw bolts (7) or the like,
   characterized in that screws (7) are omitted at least sectionally in the plane (E2) of the bath meniscus of the mould (1) when the mould plates (5, 6) are fastened, and in that the thusly reduced bracing forces are compensated by respectively providing additional thread arrangements (4/4) and screws above and/or underneath the plane (E2) of the bath meniscus (Figure 6).
4. A fastening arrangement for mould plates of a continuous casting mould (1) that consist of a heat conducting metal, particularly a copper alloy, and are provided, if applicable, with support plates on the outer surfaces, wherein cooling water channels are defined between said mould plates and the mould plates can be respectively braced relative to one another and mounted on water boxes with a number of screws (7), for example, screw bolts or the like,
   characterized in that screws (7) are omitted at least sectionally in the plane (E2) of the bath meniscus of the mould (1) when the mould plates (5, 6) are fastened, and in that relatively larger threads (4+) for correspondingly thicker screw bolts (7+) are provided in the planes (E1, E3) above and underneath the plane (E2) of the bath meniscus as a substitute for the omitted screws (Figure 9).
5. The fastening arrangement for mould plates according to Claim 3,
   characterized in that screws (7) omitted in the plane (E2) of the bath meniscus are compensated by arranging a corresponding number of screw bolts in the form of a double row (4/4) in the first and/or third plane (E1, E3) (Figure 8).
6. The fastening arrangement according to Claim 3,
   characterized in that screws (7) omitted in the plane (E2) of the bath meniscus are compensated by assigning a corresponding number of additional screw bolts to the first and/or third plane (E1, E3) in the form of a denser row (Figure 7).
7. The fastening arrangement according to Claim 3 or 5,
   characterized in that screws (7) omitted in the plane (E2) of the bath meniscus are compensated by assigning a corresponding number of additional screw bolts (4, 4) to the plane (E1) in the form of a denser row and by vertically doubling the row (4/4) in the third plane (E3).
8. The fastening arrangement according to at least one of Claims 3-7,
   characterized in that screws (7) omitted in the plane (E2) of the bath meniscus are compensated by alternately arranging in a double row and/or vertically doubling a corresponding number of screw bolts (4) regionally in the planes (E1, E3).
9. The fastening arrangement according to at least one of Claims 3-8,
   characterized in that screws (7) omitted in the plane (E2) of the bath meniscus are regionally compensated by horizontally or vertically doubling the screw bolts (4/4) regionally in the planes (E1, E3) and sectionally providing relatively larger threads for correspondingly thicker screw bolts (4+) in the plane E2 (Figure 10).

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