KR20010080985A - Method and device for changing the thickness of a strand - Google Patents

Abstract

Two or more first side walls (8,8 ') defining continuous cavities (5) on opposing sides and defining the width of strand (1) in situ, and said first side walls Another two or more second side walls 10, 10 'adjacent to (8, 8') and defining the thicknesses D ₁ , D ₂ of the strand 1 in situ, and the second Continuous casting mold having strand guides 13 which support the casting strand 1 in succession to the side walls 10, 10 ′ and which can be adjusted according to the different thicknesses D ₁ , D _{2 of} the strand 1. (6), in the method of changing the thickness of the strand from the first thickness (D ₁ ) to the second thickness (D ₂ ) during continuous casting, the casting melt (2) inside the continuous casting mold (6) This short interruption forms the intermediate end 20 of the strand 1, the strand being oriented by one end to be welded to the intermediate end 20 of the strand 1. The thickness of the second (1) intermediate end portions, and a sleeve 21 attached to 20, wherein the sleeve 21 end 24 is opposed to and spaced apart, and wherein the strand (1) from the strands (1) of the (D ₂ Is open at a second thickness, and at least one of the second side walls 10, 10 'has a second thickness before and after attachment of the sleeve 21 as the first thickness D ₁ of the strand decreases or increases. End 24 of the sleeve 21 facing away from the strand 1 is set at a high position inside the cavity with respect to the continuous casting mold 6 by the strand 1 being sent out, A casting melt follows and the strand guide 13 is adjusted to a second thickness D ₂ .

Description

METHOD AND DEVICE FOR CHANGING THE THICKNESS OF A STRAND}

The present invention relates to a method for changing the thickness of a strand, in particular a steel strand, from a first thickness to a second thickness during a continuous casting process, and to an apparatus for carrying out the method, in which the cavity and the cavity are defined on opposite sides. And at least two first sidewalls defining the width of the strands by their position, at least two second sidewalls adjacent the first sidewall and defining the thickness of the strands by their position, and a continuous second sidewall. A mold for continuous casting is used having a continuous cavity with a strand guide that supports the casting strand on the face and is adaptable to different thicknesses of the strand.

In particular, steelmakers who need to supply flat roll mills and wide strip trains need to make strands of different thicknesses that can be used for further processing to provide product optimization upon the manufacture of thick plates or wide strips.

Previously, thick slabs have been manufactured for plate production for about four weeks, about five days a week. This makes it possible to minimize the time for setting up a continuous casting plant for a new casting thickness. One disadvantage is the long distribution time for the plate. In addition, in practice only cold slabs can be used in flat rolling mills, which is undesirable in terms of energy consumption (reheating) and productivity (stay time in pusher furnaces).

Many methods for changing the width of strands, particularly strands with slab cross sections, without interrupting the casting process are described, for example, DE-B-29 03 245, AT-B 374 128, AT-B 374 127, AT Known from -B 374 710. It is essential to reduce the discontinuity of the casting in improving the above methods. That is, it is necessary to change the width without having to completely remove the strand having the first width from the continuous casting facility, and then change over the continuous casting mold and start casting the strand having the second width. However, in all known methods for changing the width of the strand, it is essential to shorten the casting operation or to sharply reduce the casting speed. The former is necessary when only a short strand transition is formed, which works with the transition part to be inserted into the continuous casting mold and extends from the first width to the new width as in DE-B 29 03 245, the latter being narrow This is necessary when the wall is slowly adjusted to the new strand width during casting and a long strand transition is obtained.

It is an object of the present invention to provide a method by which the thickness of a strand can be changed from the first thickness to the second thickness without interruption of the continuous casting process. To cast a strand with a thickness that is different from the thickness of the strand that has already been cast in the same casting machine, stop or change the narrow sides after stopping the casting process, completely removing the already cast strand from the mold, and then removing the strand guide. It is then necessary to adjust the strand guide to a new casting thickness and finally to introduce the low temperature strand into the strand guide or mold in turn. Only it was possible to restart the casting process. This is complicated and time consuming as described above due to the long downtime of the plant. This is particularly unreasonable when continuously dispensing melt-filled casting ladles from a steel mill to a casting bay.

It is an object of the present invention to solve these shortcomings and difficulties, and to provide a method for changing the thickness of a strand without interruption of the casting process as described above, and an apparatus for performing the method. In particular, it is intended to be able to continuously cast strands having a new thickness that is different from the thickness of the strands that have already been cast after an extremely short interruption of the casting process. For example, it is intended to enable continuous casting of strands having a second thickness without the problems associated with strand guidance in the bending zone due to supercooled strands.

In the above-described method, this object is

The casting melt into the continuous casting mold was briefly interrupted to form the intermediate end of the strand,

The sleeve is attached to the middle end of the strand by one end to be welded to the middle end of the strand,

An end of the sleeve is spaced apart from the strand and is open corresponding to the second thickness of the strand,

At least one of the second side walls is adjusted to a second thickness before and after attachment of the sleeve as the first thickness of the strand decreases or increases,

An end of the sleeve facing away from the strand is set at a high position inside the cavity with respect to the continuous casting mold by the strand being sent out,

The casting melt into the cavity of the continuous casting mold is continued into the sleeve to be cast,

At the start of further feeding of the strand the strand guide is achieved by adjusting the second thickness of the strand by progressively passing the strand transition point from the first thickness to the second thickness in the longitudinal direction of the strand guide.

The method according to the invention makes it possible to feed flat and wide strip trains in accordance with the corresponding thickness (almost pure shape) of the slab without lowering the productivity due to the continuous casting plant. Thus, several different casting thicknesses can be set, for example, without excessive cost increase due to an excessive number of molds. Another advantage is that casting thickness changes are possible without loss of productivity of the continuous casting plant. Thus extremely free production of flat strip mills as well as wide strip trains can be achieved.

By narrowing the mold in a slab continuous casting plant, it is possible to save a significant cost of about 5% of the mold cost in terms of cost. The change in casting thickness is particularly advantageous when the change of the dispenser is carried out.

Preferably, in order to further simplify attaching the sleeve to the middle end of the strand, the middle end of the strand is placed in a height position below the continuous casting mold by the strand to be fed out before the sleeve is attached to the middle end of the strand.

Conveniently, the second side wall is moved to a distance greater than the second thickness of the strand and only then applied to the sleeve before attaching the sleeve in case the thickness of the strand increases.

In order to restart the casting process after stopping the casting process, the space between the side wall of the continuous casting mold and the sleeve is sealed.

In order to quickly change the continuous casting mold from the first thickness to the second thickness, it is advantageous that the first side wall is replaced with a first side wall designed according to the second thickness of the strand.

However, it is also possible to provide a first side wall having an adjustable width, for example to provide a replaceable structural member relative to each other, as a result of which the second thickness continuous casting mold is similarly adjusted from the first thickness. It can also be done in a short time.

In order to carefully guide the thickness of the strands to the new thickness, during application to the second thickness the strand guides will preferably appear in a wedge form from the first thickness to the second thickness and this wedge-shaped transition region is simultaneously with the delivery of the strands. Move to the area over the length of the strand guide.

If the strand guide is formed of segments that are adjustable to the thickness of the strand, the strand guide is conveniently adjusted stepwise to the second thickness of the strand. That is, when the strand having the second thickness is cast, it is gradually adjusted during further feeding of the strand.

Preferably, only one side wall of the two second side walls is adjusted to the strand having a diameter of the second thickness and the other maintains a constant position during the change of thickness.

In order to satisfactorily change the strand guide from the first thickness to the second thickness, the dispensing speed and / or instantaneous position of the middle end of the strand is detected and the control or regulating device is functioned as a function of It is preferable to adjust the strand guide by means of a.

An apparatus for carrying out the method has a continuous casting mold and a strand guide positioned downstream of the continuous casting mold to support the strands on opposite sides in the thickness direction and which can be applied according to different thicknesses of the strands, the side walls of the sleeve By the different thicknesses of the strands, one end of the sleeve forming the cross-sectional shape of the strands, the thickness of which is designed to be derived from a predetermined thickness on the continuous casting mold.

In particular, according to a preferred embodiment for increasing the thickness of the strand, the sleeve corresponds to a first strand cross-sectional shape with one end having a first thickness and the other end having a second thickness that is different from the first thickness. The end of the sleeve, which corresponds to the second strand cross-sectional shape and which can be attached to the middle end of the strand when the thickness of the strand is increased, is slightly smaller than the strand cross section, preferably the average value of the thickness of the strand sheath at the middle end. With a cross-sectional dimension as small as possible, the end of the sleeve, which can be attached to the middle end of the strand, is designed to taper outwardly towards the end in the form of a wedge.

In order to automatically change the strands, the device according to the invention is operated for adjusting the strand guide and means for detecting the dispensing speed of the instantaneous position of the intermediate end of the strand, and for a control or adjustment unit connected to the detecting means. Means further comprising means, said actuation means being actuated and deactuated by said control or regulation unit.

Hereinafter, the present invention will be described in more detail with reference to the drawings showing exemplary embodiments. 1 to 4 show schematic side views of the various stages of the continuous casting plant during the change from the first thickness D ₁ to the second thickness D ₂ . 5-6 are detailed views of FIGS. 2 and 7-14 for illustrating a variant of the method and apparatus according to the invention.

Each of the figures shows a continuous casting plant for casting a steel strand 1 having a slab cross section. The steel melt 2 flows from the casting ladle 3 to the tundish 4, from which the melt 2 passes via the casting pipe 7 which is connected to the cavity 5 of the continuous casting mold 6. Flows into the continuous casting mold 6. The continuous casting mold 6 is preferably designed as a flat mold and has two first side walls 8 which form the narrow side walls of the strand 1 and two which form the wide side walls 9 of the strand 1. Actuators 11 having two second sidewalls 10, 10 ′, the first and second sidewalls 8, 10, 10 ′ being applied to different cross sections and setting different cone shapes applied to the strand cross sections. Can be adjusted by

Although not shown in detail for the sake of clarity, the continuous casting mold 6 is provided with an internal cooling device and a vibration device.

Preferably, the first sidewall 8 can be exchanged by, for example, a quick changer so that a continuous casting mold 6 can be used for casting strands of different thicknesses. Instead of exchanging the first side wall 8, it is possible to apply different thicknesses of strand 1, for example by making it adjustable by means of parts displaceable with respect to one another. As another possibility, by fixing the second sidewalls 10, 10 ′ between the first sidewalls 8, the second sidewalls 10, 10 ′ can be moved towards or away from each other and the first sidewall 8 To form a closed cavity.

The continuous casting mold 6 is provided with a strand guide 13, which is formed of support rollers 12 positioned opposite each other and extends horizontally across the entire arc around the quadrant to support the strand 1. It is mounted in the supporting elements 16, 17, 18 which serve to. The strand 1 still initially has a thin strand sheath 14 and a liquid core 15, preferably extending horizontally. The first support element of the strand guide 13 directly under the continuous casting mold 6 is designed as a straight guide 16. A bend region 17 is provided as a support element after the straight guide, and the strand 1 initially emerging from the continuous casting mold 6 in a straight line shape is bent in an arc shape. The bend region 17 is followed by an arc-shaped strand guide. The straight guide is formed by a plurality of support elements 18 arranged one after the other, followed by a straight region in which horizontal strand guides, such as those which are not carried out anymore but are generally carried out in a continuous continuous casting plant, are installed.

The strand guide 13 is fully applicable to different thicknesses of the cast strand by the actuator 19, preferably one side of the two roller conveyors of the actuator is positioned opposite each other and is particularly convenient for the strand guide 13. The other outer or lower roller conveyor is designed as a stationary side and in this regard the opposite inner or upper roller conveyor can be set.

By means of an actuator 19 provided with a straight guide 16, a bending zone, an individual part 18, a straightening zone, etc., the roller conveyors arranged in the straight guide 16 and the bending zone 17 and in the individual parts are As shown in FIG. 4 for 18 ', it may preferably be moved from this wedge position to a position substantially concentric to the outer roller conveyor and vice versa to form a wedge strand guide component.

A method according to the invention for changing the first thickness D ₁ of strand 1 to the second thickness D ₂ of strand 1 is shown with reference to FIGS. 1 to 4.

First, the casting is stopped and the tundish 4 is pivoted to the side so that the continuous casting mold 6 can be easily accessed from the top. The second sidewalls 10, 10 ′ are then moved away from each other at a distance D ₃ , in particular greater than the second thickness D ₂ of the strand 1 to be cast. In this case, only one sidewall 10 'of the two sidewalls 10, 10' is similarly adjusted, and the second sidewall 10 arranged to align with the fixed side of the strand guide 13 has its position. Keep it.

Then, the strand 1 together with the interrupted end 20 formed on the strand is moved to a position below the continuous casting mold 6, wherein the sleeve 21 is attached to the intermediate end 20 (FIG. 2). And FIG. 5). The sleeve 21 has a cross section slightly smaller than the strand cross section having a first thickness D ₁ at the lower end attached to the intermediate end 20 such that the wall of the sleeve 21 is still a liquid of the strand 1. It penetrates inside the part 15 but begins to support the already solidified sidewall of the strand 1, ie the strand sheath. The lower end region 23 of the sleeve 21 here is designed to be inclined in the form of a wedge in order to contact the strand sheath 14. The lower end region 23 of the sleeve 21 is welded to the intermediate end 20 of the strand 1.

The upper end 24 of the sleeve 21 has a cross section with a second thickness D _{2 on} which the strand 1 will be cast continuously. One side of the sleeve between the lower end 22 of the sleeve 21 and the upper end 24 of the sleeve 21, in particular the side which cooperates with the adjustable second side wall 10 ′ of the continuous casting mold 6, It is designed to project an inclined side surface 25 to be provided between the sleeve portion and the upper sleeve portion.

The sleeve 21 begins to operate when the adjustable sidewall 10 'is moved relative to the opposing second sidewall 10 so that the wall of the sleeve 21 is continuously cast as shown in FIG. And is enclosed by two seals 26, preferably two seals 26, arranged in different vertical positions to be sealably supported on the first and second side walls 8, 10, 10 '.

The first sidewall 8 that was present in the continuous casting mold during casting of the strand ₁ with the first thickness D ₁ before the adjustable second sidewall 10 ′ was changed to the second thickness is shown in FIG. 5. 'to be able to be exchanged for a), the first side wall (8' in solid lines and in particular the first side wall (8 designed according to as indicated by one-dot chain line), a second thickness (D _2), the second side wall) and then ( 10, 10 '). However, as described above, the first sidewall 8 may be adjusted to a new thickness dimension, for example by displacement of two wedge-shaped sidewall portions of each sidewall 8, or optionally between said first sidewalls 8 '. 2 side walls 10, 10 'can be fixed.

After the second sidewalls 10, 10 ′ are set to the second thickness D ₂ , continuous casting is performed and the sleeve 21 is first filled with melt (see FIG. 3). At the same time and also in order to prevent the melt of the wall of the sleeve 21, which is made of metal which is to be cast much earlier, preferably steel in the present invention, the sleeve 21 is exposed directly to the coolant on the outside, preferably intentionally by cooling water. Sprayed into.

Further feeding of the strand 1 can be continued, and as shown in FIG. 4, the strand guide 13 has an opposite fixed roller corresponding to the second thickness D ₂ , according to the exemplary embodiment shown. as a result of the movement of the roller conveyors adjustable in distance from the conveyor, the second is gradually adjusted to the thickness (D ₂₎ with the progress of the strand transition part from the first thickness (D ₁₎ to a second thickness (D ₂₎ . This operation is carried out in stages, in particular in part, in each case during which the roller 12 in the part 18 transitions from the first thickness D ₁ to the second thickness D ₂ . 4 is first in the wedge position.

According to the embodiment shown in FIGS. 7 and 8, the two roller conveyors of the strand guide 13 are adjusted to a new thickness dimension D ₂ symmetrically to the strand center line 27, and similarly to the continuous casting mold 6. The two second side walls 10, 10 ′ of) must be set to a new thickness dimension D ₂ symmetrically with respect to the central axis of the continuous casting mold 6.

In order to change the individual elements 16, 17, 18 of the strand guide 13 from the first thickness D ₁ to the second thickness D ₂ , the adjustment or control device 28 is preferably used as described above. There is provided an actuating device 19 which is actuated and deactivated. The regulating or control device 28 is connected to the delivery speed detection device according to FIG. 17, 18 may be changed from the first thickness D ₁ to the second thickness D ₂ as a position function of the strand displacement component. Thereby, the strand transition region directly over the region still having the first thickness D ₁ , over substantially the entire length by the strand guide 13 and from the first thickness D ₁ to the second thickness D ₂ . That is, the strand 1 is supported only on a short distance not in direct contact with the roller 12.

However, it is also possible to connect the adjustment or control unit 28 to a device for detecting the instantaneous position of the strand transition region. This is because, for example, it is detected at the position where the sleeve 21 is precisely located along the strand guide 13 without circulation by the strand feeding speed.

The new design of the mold is considered to be particularly important for carrying out the method according to the invention. In the mold design used in the present invention, the wide side of the slab continuous casting mold is clamped against the narrow side by a prestressed cup string which can be released by the pressure medium cylinder. However, by doing so, there is a possibility that the wide side is moved with only a very short adjustment interval so that it can be precisely adjusted as it is necessary to free the narrow side for the purpose of exchanging the uncontacted one. Such prior art is described in AT-B-366 607, AT-B-343 304 and AT-B-344 929. According to DE-C-36 40 096, the wide side wall of the slab mold can be adjusted by a small amount by the pressure medium cylinder, so that different gaps can be set between the wide side and the narrow side, but with the spring assembly The clamping for the narrow side is always similarly made by the side at the same width.

These known molds must always be removed when the casting thickness is changed and replaced with another mold designed with a different casting thickness. Although it is possible to exchange the narrow side for different casting thicknesses on the mold, this can only be done in a repair shop since a complete conversion is required in such a case.

The novel design according to the invention has a hydraulic clamping device for clamping the narrow sides 8, 8 ′ between the wide sides 10, 10 ′, the wide side 10, 10 ′ in the present invention. That is, the second side walls 10, 10 ′ are adjusted in the casting thickness range 31 defined by the hydraulic pressure. This eliminates the narrow side (8,8 ') and replacement of the narrow side (8,8'), i.e. the first side wall for different casting thicknesses, without the need for complicated work that could only be carried out in a repair shop, for example setting. Offers the possibility.

A schematic representation of the mold according to the invention serves to adjust the cross section parallel to the vertical longitudinal axis 32 of the mold, ie the wide side walls 10, 10 ′, the first side wall 10 of the slab mold. Is shown in FIG. 9 as a cross section through 10 ' FIG. 10 is a side view of the second side walls 10, 10 ′ and it can be seen that the hydraulic cylinders 30 are aligned on the second side walls 10, 10 ′.

As shown schematically in FIG. 11, two L-shaped wall structures 33 can form a continuous casting mold, the elongated portion of the L-shaped wall region defining the wide side of the strand and the thickness of the strands being It is formed by the distance between two elongated wall parts. Similarly the adjustment of the two L-shaped wall structures 33 is carried out hydraulically.

12 shows a variant of the continuous casting mold for carrying out the method according to the invention, in which the second side wall 10 ′ is designed in plan but the opposite second side wall 10 is U-shaped. The first side walls 8, 8 ′ are clamped between the two side walls 10, 10 ′. In order to change to a larger strand thickness and a larger strand width, the second side walls 10, 10 'can be moved separately and this is similarly done hydraulically. The first side walls 8, 8 ′ lie on legs parallel to each other of the U-shaped second side wall 10 in a horizontal perspective view as schematically shown by the dashed lines in FIG. 12. Clamping of the first side walls 8, 8 ′ between the second side walls 10, 10 ′ is carried out continuously, followed by continuous casting.

Claim 1 has a change to the thickness (D ₁₎ the first thickness (D ₁₎ a small second thickness (D ₂₎ than from is shown with reference to FIGS. In this case, the sleeve 21 has a lower end region corresponding to the larger first thickness D ₁ of the strand 1 and an upper end region designed according to the smaller second thickness D ₂ . After the sleeve 21 rests on the strand 1, the intermediate end (on the top) of the upper end region of the sleeve 21 with the smaller second thickness D ₂ lies inside the cavity 5 of the continuous casting mold. The strand on which 20 is formed is sent out from the continuous casting mold 6. Thereafter, the first side walls 8, 8 ′, ie narrow side walls, can be replaced for the narrow one, and casting is carried out after the clamping of the narrower narrow side wall. The strand guide roller 12 with the strand guide consisting of the parts 13, 16, 17 is adjusted to a new strand thickness D ₂ according to the progressive delivery of the strand 1.

Claims (21)

Two or more first side walls (8,8 ') defining continuous cavities (5) on opposing sides and defining the width of strand (1) in situ, and said first side walls Another two or more second side walls 10, 10 'adjacent to (8, 8') and defining the thicknesses D ₁ , D ₂ of the strand 1 in situ, and the second Continuous casting mold having strand guides 13 which support the casting strand 1 in succession to the side walls 10, 10 ′ and which can be adjusted according to the different thicknesses D ₁ , D _{2 of} the strand 1. (6), in the method of changing the thickness of the strand, in particular the steel strand, from the first thickness D ₁ to the second thickness D ₂ during continuous casting The casting melt 2 into the continuous casting mold 6 is briefly interrupted to form the intermediate end 20 of the strand 1, The sleeve 21 is attached to the middle end 20 of the strand 1 by one end to be welded to the middle end 20 of the strand 1, The end 24 of the sleeve 21 faces away from the strand 1 and is open corresponding to the second thickness D ₂ of the strand 1, At least one of the second side walls 10, 10 ′ is adjusted to a second thickness before and after attachment of the sleeve 21 as the first thickness D ₁ of the strand decreases or increases, The end 24 of the sleeve 21 facing away from the strand 1 is set at a high position inside the cavity with respect to the continuous casting mold 6 by the strand 1 being sent out, The casting melt into the cavity 5 of the continuous casting mold 6 is continued to the sleeve 21 to be cast, At the start of further feeding of the strand _{1 the} strand guide 13 passes progressively through the strand transition point from the first thickness D ₁ to the second thickness D _{2 in} the longitudinal direction of the strand guide 13. The second thickness (D ₂ ) of the strand (1). The method of claim 1, wherein before the sleeve 21 is attached to the middle end 20 of the strand 1, the middle end 20 of the strand 1 is continuously cast by the strand 1 to be fed out. Characterized by moving to a higher position under the mold (6). 3. The method of claim 1, wherein before attaching the sleeve 21, the second sidewalls 10, 10 ′ move earlier by a distance D ₃ greater than the second thickness D ₂ . Applied only to the sleeve (21) afterwards. Method according to one or more of the preceding claims, characterized in that the space between the sleeve (21) of the continuous casting mold (6) and the side walls (8 ', 10, 10') is sealed. . 5. The method according to claim 1, wherein the first side wall 8 is replaced with a first side wall 8 ′ designed according to the second thickness D ₂ of the strand 1. Characterized in that the method. 5. The method according to claim 1, wherein the first side wall 8 has an adjustable width and is adjusted according to the second thickness D ₂ of the strand 1. 6. . The method according to any one of claims 1 to 6, wherein during application of the second thickness (D ₂ ) the strand guide (13) is in the form of a way from the first thickness (D ₁ ) to the second thickness (D _2). And the wedge-shaped transition region is moved over the length of the strand guide (13) simultaneously with the delivery of the strand (1). The strand guide 13 is stepwise in accordance with one or more of the preceding claims, during the further delivery of the strand 1 when the strand 1 having the second thickness D ₂ is cast. , Ie, adjusted to the second thickness D ₂ of the strand with a gradual cross section. 9. The method according to claim 1, wherein only one side wall 10 ′ of the two second side walls 10, 10 ′ is the second thickness D ₂ of the strand 1. And one of the two second side walls (10, 10 ') maintains a constant position during the change in thickness (D ₁ ). 10. The support element (16), (17) according to claim 9, wherein the strand guide (13) carries a plurality of support rollers (12) arranged one after the other and in each case opposed to each other and adjusted relative to one another. is formed by a 18), characterized in that only the support rollers of one side in each case, to set the second thickness (D ₂₎ of the strand (1) is adjustable for adjustment to the second thickness (D ₂₎ How to. The delivery speed or instantaneous speed of the intermediate end 20 of the strand 1 is detected, and the adjustment of the strand guide 13 is carried out by the strand 1. A function of the position or delivery speed of the intermediate end (20) of the control or adjustment device (28) and preferably via a computer. Located downstream of the continuous casting mold and the continuous casting mold 6 to support the strand 1 on the opposite side 9 in the thickness direction and can be applied according to different thicknesses D ₁ , D ₂ of the strand 1. Apparatus for carrying out the method according to any one of claims 1 to 11 with a strand guide (13), The side walls 10, 10 ′ can be adjusted according to the different thicknesses D ₁ , D ₂ of the strands by the sleeve 21, with one end of the sleeve forming the cross-sectional shape of the strands, the thickness of the sleeve And (D ₂ ) is designed to be derived from a predetermined thickness (D ₁ ) on the continuous casting mold (6). The method of claim 12, wherein the sleeve 21 has one end to which is different from a second thickness of the corresponding to the first strand cross-sectional profile having a first thickness (D ₁₎ and the other end is the first thickness (D ₁₎ And a second strand cross-sectional shape having. 14. The end 22 of the sleeve 21 according to claim 12 or 13, which can be attached to the intermediate end 20 of the strand 1 when the thickness D ₁ of the strand 1 increases. Is cross-sectional dimension slightly smaller than the strand cross section, preferably as small as an average of the thickness of the strand sheath (16) at the intermediate end (20). 15. The device according to claim 14, characterized in that the end (22) of the sleeve (21), which can be attached to the middle end (20) of the strand (1), is designed to taper outwardly toward the end in the form of a way. . 16. The strand according to one or more of claims 12 to 15, further comprising: means for detecting a delivery speed at an instantaneous position of the intermediate end of the strand (1), a control or adjustment unit (28) connected to said detection means and said strand And an actuating means (19) for adjusting the guide (13), said actuation means (19) being actuated and deactivated by said control or regulation unit (28). 12. A continuous casting mold for carrying out the method according to any one of claims 1 to 11. The continuous casting mold is adjacent to at least two side walls 8, 8 ′ and the first side wall 8, 8 ′ defining a cavity on opposite sides and defining the width of the strand 1 in place. Characterized in that it has at least two further sides 10, 10 'which define the thicknesses D ₁ , D ₂ of the strand _{1 in place} and can be set to different thicknesses D ₁ , D ₂ . Continuous casting mold. 18. A continuous casting mold according to claim 17, wherein the second side walls (10, 10 ') are adjustable relative to each other by hydraulic cylinders (30). 19. The device according to claim 18, wherein the second side walls (10, 10 ') can be pulled against each other by a hydraulic cylinder (30) while the first side walls (8, 8') are between the second side walls. Continuous casting mold, characterized in that inserted and clamped. 20. The hydraulic cylinder (30) according to claim 19, wherein the hydraulic cylinder (30) is on one side of the second side wall (10 ') on the opposite side wall of the second side wall (10, 10) with a piston rod on the other ( 10) continuous casting mold, characterized in that supported by. 21. The continuous casting mold according to claim 20, wherein the second side walls (10, 10 ') are rectangular in shape and hydraulic cylinders are arranged in the corners of the rectangle.