DE1082377B - Rollers for lowering the casting train in continuous casting plants - Google Patents

Description

GERMAN

The casting of the melt of larger furnace units according to the continuous casting process is expedient in several strands carried out at the same time, in order to cause excessive cooling of the melt avoid long pouring times. When casting in several strands at the same time, there is one for each strand separate lowering device provided. This arrangement has the disadvantage that each of these devices takes up a lot of space and the molds for the individual strands at a large distance from each other must be set up. Accordingly, the troughs through which the Melt flows into the molds, must be correspondingly long, which causes considerable temperature losses will. In such systems it happens repeatedly that the melt freezes in a channel and thus the strand in question, the inflow of which was thereby prevented, for the further casting process fails.

In order to be able to move the molds and thus the strands closer to one another, it has already been proposed; -.'-

gen, all the strands on one side of one

common and driven roller, while on the opposite side one for each strand a separate roller is provided, which can be displaced in the direction of the strand, which roller is guided by it Strand presses against the common roller.

These rollers, which are separate for each strand, are arranged in pairs in an adjustable bracket. the Lowering rollers of the continuous caster would have to be replaced when the strand cross-sections are changed, in order to be able to guide each strand of rollers with a corresponding surface area.

For rolling mill roller tables, rolls have also been proposed in which part of the roll shell is cushioned in both axial directions in order to avoid impacts of the billet in the axial direction to be able to evade the roller. However, because of their axial displaceability, such rollers are known as lowering rollers unsuitable in continuous casting plants.

In order to be able to manage several strands with a single gear in S tranggießanlagen, according to the invention proposed a lowering roller, the strands of which clad against the roller core has at least two substantially radially resilient parts in the axial direction.

The subject matter of the invention is explained using a drawing which shows an exemplary embodiment. Fig. 1 shows the lowering roller according to the invention in longitudinal section and Fig. 2 shows the same roller in cross section. Fig. 3 shows the longitudinal section through a lowering roller, with the shell opposite the core is cushioned with rubber buffers.

With the driven shaft 1 is through a roller for lowering the cast strands
in continuous casting plants

Applicant:

Gebr. Böhler & Co. Aktiengesellschaft,

Vienna,

acting through the branch,
Stuttgart-Untertürkheim, Benzstr. 19th

Claimed priority:
Austria from April 27, 1953

Dipl.-Ing. Dr. techn. Rudolf Obauer,

Wartliberg, Styria (Austria),

has been named as the inventor

Wedge 2 is connected to a roller core 3. On this three coil springs 4 are arranged in a star shape in a triangle, which are connected to the roll shell 5. Each roll shell is expedient in the axial direction connected to the core by at least two sets of springs, around a corner to complicate two rolls to each other, if a strand on one of the roll shells is only partially closed come to lie. In Fig. 1, some strands of different cross-sectional shapes are above the roll surface indicated, from which it can be seen that the inventive roller design strands with different Cross-sections or several strands can be lowered at the same time. The coat, but also the core of the roller provided for lowering a strand of the multi-strand system can be divided for the purpose of better snuggling.

In Fig. 3, an embodiment of the lowering roller is shown in which the cushioning is not by means of coil springs, but with rubber buffers. Here 1 is the roller shaft, 2 the wedge which connects the roller core 3 with the shaft. On this core are in recesses Rubber blocks 6 inserted. These are provided with recesses 7 to increase the spring effect. on the rubber blocks sits a jacket made of highly thermally conductive material 8, z. B. Copper, which itself

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which is surrounded by a jacket 5 made of steel. The strand to be lowered lies on this steel jacket at. To prevent large amounts of heat from flowing over from the jacket 5 to the rubber buffers the copper cylinder 8 is provided with bores through which a coolant can be passed.

In the case of continuous casting in several strands, it is sometimes advantageous to use one of the lowering rollers of two adjacent strands not to be cushioned, so that next to a sprung roller an unsprung one The roller comes to rest on the common axis. It should be noted, however, that the The extent of the rollers is decisive for the lowering speed of the strand and therefore changes the roller diameter, as is the case when the springs are pressed in on spring-loaded rollers can, a reduction in the lowering speed of that strand, which of the resilient Roller is guided, causes.

In order to partially compensate for this change in the lowering speed, the diameter of the spring-loaded roller chosen to be a small amount larger.

The diameter of the spring-loaded roller must also be larger in this case because at completely same strand cross-sections, the roller pressure on the strand is mainly due to the non-resilient Roller would take place while the resilient roller still rest loosely on the strand to be guided by it would.

If one side cools down more, the strand bends. Because of this curvature of the strand, closely spaced strands may come into contact and start moving prevent. To prevent this, adjusting rings can be arranged on the rollers.

Claims (5)

Patent claims: 1. Roller for lowering the cast strands in continuous casting plants, especially for those that are difficult to melt Metals, characterized in that between the roll shell and the roll core in the Axial direction at least two essentially radially resilient parts, such as helical springs, or elastic parts such as rubber buffers are provided. 2. Roll according to claim 1, characterized in that in the roll shell (5) from a counter high temperature resistant material, e.g. B. steel, a cylinder (8) made of a material that conducts heat well, z. B. copper is used. 3. Roller according to claim 1 or 2, characterized in that the jacket, in particular that made of a material that conducts heat well, is provided with a cooling system. 4. Roller according to claim 1, 2 or 3, characterized in that one or more on an axis resilient rollers are arranged next to a non-resilient roller. 5. Roll according to claim 1, 2, 3 or 4, characterized in that the jacket diameter of the resilient rollers is slightly larger than that of the non-resilient roller. Considered publications:
German Patent No. 382,740;
French Patent Nos. 572 528, 1,042,684; Swiss patent specification No. 256 024. 1 sheet of drawings © 0Ü9 52T / 273 5.60