DE102019201319A1 - Strand guide roller of a strand guide for guiding a cast metallic strand - Google Patents

Abstract

The invention relates to a strand guide roller (1) of a strand guide for guiding a cast metallic strand, which has at least a first and a second part-roller (2, 3) arranged axially aligned next to one another, with a bearing (4) between the two part-rollers (2, 3) ) is arranged to support the two partial rollers (2, 3) and wherein the partial rollers (2, 3) consist of a first material. In order to enable simple assembly and disassembly of the arrangement and to use the optimal materials for the partial rollers and the bearing journals, the invention provides that a roller journal (6) is fastened in the axial end (5) of the first partial roller (2) , which consists of a second material, which is different from the first material, wherein the roller pin (6) passes through the bearing (4) and with its axial end (7) remote from the first part of the roller (2) in a bore (8) of the second part roll (3) reaches in to store them.

Description

The invention relates to a strand guide roller of a strand guide for guiding a cast metallic strand, which has at least a first and a second axially aligned partial roller arranged side by side, wherein a bearing for storing the two partial rollers is arranged between the two partial rollers and wherein the partial rollers are made of a first material consist.

A generic strand guide role is from the DE 10 2014 223 010 A1 known. One axial end of the one partial roller is designed as a bearing journal which passes through the bearing and extends into a bore in the other partial roller. The disadvantage of this solution is that the partial roller and the bearing journal are made of the same material, but must perform different functions. While the jacket of the partial roll must be suitable for the build-up welding of material, other requirements apply to the bearing properties of the journal; namely, they must have a particularly high strength in order to be able to transmit the bearing forces. In addition, the material loss in the area of the tenon is relatively high.

A strand guide roller of basically the same construction discloses the EP 2 032 289 B1 . Here, too, the journal, which passes axially through the bearing, is formed from the material of the one partial roller by machining. Such a solution also shows DE 100 24 513 A1 .

The EP 1 937 430 B1 shows a solution in which bearing pins are shrunk into bores in the two axial ends of the respective partial rollers. This has the advantage that the journals can be made from a different material than the one from which the partial rollers are made. The disadvantage here, however, is that the bearing journals have to be sawed through to remove the bearing during dismantling.

Another solution shows the DE 10 2011 084 231 A1 , in which each partial roller has a bearing journal in the axially end region, which extends into the bearing between the two partial rollers. In addition to the problem described above in the case of the same material for the roller and bearing journal, there is also the problem described here when dismantling the strand guide roller.

The invention is therefore based on the object of developing a generic strand guide roller in such a way that the problems mentioned can be overcome. A simple assembly and disassembly of the arrangement should therefore be possible. Furthermore, it should be possible to use the optimal materials for the partial rollers and the bearing journals, whereby an economical production method is sought.

The solution to this problem by the invention is characterized in that a roller pin is fastened in the axial end of the first partial roller, which roller pin consists of a second material which is different from the first material, the roller pin penetrating the bearing and with it from the first Axial end distal part extends into a bore of the second sub-roller to store it.

The roller pin fastened in the first partial roller is preferably arranged by shrinking in a bore of the first partial roller.

As mentioned, the material of the partial rollers and that of the roller journal are different. The partial rolls are preferably made of a material that is suitable for cladding. However, the roller pin is preferably made of a high-strength material.

The bearing is preferably an undivided single bearing.

The second sub-roller is preferably mounted on a sleeve pushed onto the roller journal.

The outer diameter of the roller journal is preferably between 40% and 65% of the outer diameter of the partial rollers.

The partial rollers are preferably provided with internal channels in order to cool them by means of a passage of fluid through the channels. It can be provided that the inner channels run helically at least in sections (so-called sleeve cooling). Furthermore, it is preferably provided that a bore section in the roller journal is part of the channels, the bore section preferably being designed as a central bore in the roller journal.

In the present case, it is a strand guide roller in a continuous casting machine with a rotatable axis and at least one center bearing. Theoretically, the roll length is unlimited; the roll diameter can be of any size from 100 mm upwards.

The combination of different materials, one for the (separately manufactured) roller journal and one for the (separately manufactured) partial rollers, enables the build-up weldability of the roller bodies to be optimized without endangering the strength of the roller journal. By using different materials and materials the material loss during production can also be advantageously reduced.

It is also very advantageous to implement cooling, the cooling capacity of which lies between the previously known performance ranges of center cooling on one side and turret cooling on the other side. This allows the influence of cooling on the slab quality to be controlled in a targeted manner.

The center cooling (flow through the cooling medium through a central bore) is usually only relatively weak, which results in undesirably high roller wear due to a high surface temperature. The influence of cooling on the cast material is therefore only relatively slight.

In the case of turret cooling, however, there is usually a very high cooling capacity, which, although only minimal roller wear, also has an undesirable cooling influence on the cast material.

The preferably proposed sleeve cooling advantageously closes the gap between these two types of cooling.

Instead of relying on very little or very strong cooling of the roll, the balanced inner sleeve cooling is preferred. In this case, the cooling channel runs helically or helically at the same distance from the roller surface inside the roller. By shrinking the roller pin, there is the possibility of driving the hole for the pin very far into the roller body and using it as a cooling area. Such a cooling arrangement is not possible without the bore for shrinking the roller journal.

The intensity of the cooling is directly dependent on the distance to the surface of the roll body. The arrangement of the sleeve cooling in the middle area between the turret and center cooling means that there is a good compromise between cooling. The proposed construction with the shrinking of the roller pin creates a possibility of integrating this type of cooling into the roller in a simple manner. The cooling of the roll can now be optimally adapted to the requirements of the system.

Due to the proposed structure of the strand guide roller, it is no longer necessary to have to compromise between the suitability for cladding and the tenon strength. So far, the entire roller body has mostly been made from the high-strength material required for the journal. However, this is only poorly suited for cladding.

Another advantage is the now possible non-destructive disassembly of the roller assembly. In particular, sawing through roller journals is not necessary during disassembly.

An undivided configuration of the central bearing is also preferred. In the case of rollers with split central bearings, the repair of the bearing points is more complex and labor-intensive.

Furthermore, a single bearing is preferably provided as the central bearing. In the case of double central bearings, a very large storage window is created due to the space, which has a negative impact on the slab quality. In addition, a curved tooth coupling must be used for driven rollers in order to be able to transmit the torque.

The proposed concept allows economical use of the expensive roller pin material. In particular, waste is minimized by machining.

The roller pin shrunk into the partial roller achieves an arrangement which has the same functional properties of previously known roller bodies which are produced from a block of material. However, after the roller pin has shrunk on only one side, the advantages of assembly and disassembly are obtained.

• 1 im Radialschnitt eine Strangführungsrolle einer Strangführung und
• 2 den mittleren Bereich der 1 in vergrößerter Darstellung.

In the drawing, an embodiment of the invention is shown. Show it:

• 1 in radial section a strand guide roller of a strand guide and
• 2nd the middle area of the 1 in an enlarged view.

In the figures is a strand guide roller 1 shown, consisting of two partial roles 2nd and 3rd consists. In the axial area between the two partial rollers 2nd , 3rd is a camp 4th arranged, which is designed in the exemplary embodiment as an undivided single bearing.

In the axial end 5 the first sub-role 2nd is a hole 9 brought in. There is a roller pin in this hole 6 attached, by shrinking. Thus there is a firm bond between the partial roll 2nd and roller journals 6 in front.

The two part roles 2nd and 3rd consist of a first material that is well suited for cladding. Meanwhile, the roller pin exists 6 Made of a high-strength material that is optimized for the transfer of bearing forces.

The roller pin 6 penetrates the camp 4th axially towards the partial roller 3rd . There is a hole in this 8th into which of the roller journals 6 with its axial end 7 immersed. Over a sleeve 10th that on the end portion of the roller journal 6 is suspended, the sub-role 3rd stored.

Accordingly, the composite, consisting of partial role 2nd and roller pin 6 , axially through the bearing during assembly 4th be pushed through until the axial end 7 of the roller pin 6 in the hole 8th the sub-role 3rd immersed. Disassembly is carried out in the reverse order.

Sawing through the roller journal 6 when dismantling the arrangement is not necessary.

For dimensioning it should be stated that the outer diameter d of the roller pin 6 mostly in the range of about 50% of the outer diameter D the sub-role 2nd , 3rd lies.

For cooling the strand guide roller 1 are channels 11 introduced into the arrangement. This is a sleeve cooling in which the channels 11 sectionally helical around the longitudinal axis of the partial rollers 2nd , 3rd run. A hole section 11 ' in the roller journal 6 is part of the duct system through which cooling fluid is passed to cool the assembly.

Reference list

1

Strand guide roller

2nd

Partial role

3rd

Partial role

4th

camp

5

axial end of the first sub-roll

6

Roller pin

7

axial end of the roller journal

8th

Drilling the second sub-roll

9

Drilling the first part roll

10th

Sleeve

11

channel

11 '

Bore section in the roller journal

d

Outside diameter of the roller journal

D

Outside diameter of the partial rolls

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102014223010 A1 [0002]
• EP 2032289 B1 [0003]
• DE 10024513 A1 [0003]
• EP 1937430 B1 [0004]
• DE 102011084231 A1 [0005]

Claims (10)

Strand guide roller (1) of a strand guide for guiding a cast metallic strand, which has at least a first and a second axially aligned partial roller (2, 3), with a bearing (4) between the two partial rollers (2, 3) for storing the two partial rollers (2, 3) is arranged and the partial rollers (2, 3) consist of a first material, characterized in that a roller pin (6) is fastened in the axial end (5) of the first partial roller, the Roller pin (6) passes through the bearing (4) and, with its axial end (7) remote from the first partial roller (2), extends into a bore (8) of the second partial roller (3) in order to support it. Strand guide roller after Claim 1 , characterized in that the roller pin (6) fastened in the first partial roller (2) is arranged by shrinking in a bore (9) of the first partial roller (2). Strand guide roller after Claim 1 or 2nd , characterized in that the partial rolls (2, 3) consist of a material which is suitable for cladding. Strand guide roller according to one of the Claims 1 to 3rd , characterized in that the roller pin (6) consists of a high-strength material. Strand guide roller according to one of the Claims 1 to 4th , characterized in that the bearing (4) is an undivided single bearing. Strand guide roller according to one of the Claims 1 to 5 , characterized in that the second partial roller (3) is mounted on a sleeve (10) pushed onto the roller journal (6). Strand guide roller according to one of the Claims 1 to 6 , characterized in that the outer diameter (d) of the roller pin (6) is between 40% and 65% of the outer diameter (D) of the partial rollers (2, 3). Strand guide roller according to one of the Claims 1 to 7 , characterized in that the partial rollers (2, 3) are provided with internal channels (11) in order to cool them by means of fluid passage through the channels (11). Strand guide roller after Claim 8 , characterized in that the inner channels (11) extend helically at least in sections. Strand guide roller after Claim 8 or 9 , characterized in that a bore section (11 ') in the roller journal (6) is part of the channels (11), the bore section (11') preferably being formed as a central bore in the roller journal (6).

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