GB1591407A

GB1591407A - Rolling apparatus

Info

Publication number: GB1591407A
Application number: GB4786877A
Authority: GB
Original assignee: Schloemann Siemag AG
Current assignee: SMS Siemag AG
Priority date: 1976-11-20
Filing date: 1977-11-17
Publication date: 1981-06-24
Also published as: DE2652845A1; IT1088246B; FR2371248B3; DE2652845C2; FR2371248A1

Description

(54) ROLLING APPARATUS (71) We, SCHLOEMANN-SIEMAG AKTIENGESELLSCHAFT, of 4000 Düsseldorf 1, Steinstrasse 13, Federal Republic of Germany, a joint stock company organised under the laws of the Federal Republic of Germany do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to rolling apparatus.

Cooling water feeds for rolling apparatus are known which are bent out of pipes or constructed from pipe sections. The pipes or pipe sections have sides which face the surface regions of the working rollers near to the rolling gap and which are equipped with nozzles arranged in a row. With increased rolling output, greater cooling is required. In many cases, a working roller is therefore associated with not only one cooling water feed pipe equipped with a row of nozzles but two, or in extreme cases, three pipes which are arranged substantially parallel to one another and each of which is equipped with a row of nozzles. Separate such cooling water feed pipes permit, to a certain extent, an adaptation to the rolling output.

With reduced loading of the working rollers, one of the pipes can, for example, be separated from the cooling water feed and it is also possible in this case to take into account different widths of the rolled stock in that the rows of the nozzles of the individual cooling water pipes may be of different lengths so that different effective widths are cooled.

Pipe systems of that kind are capable of more intensive cooling by comparison with individual pipes. However, their manufacture proves to be extraordinarily expensive, since the pipes are either individually and manually bent or are made by welded together pieces.

Also, their shapes have to be relatively complicated in order that the pipes can be accommodated in the small space available. It is furthermore disadvantageous that restricted space in the direction of the rolling plane is further restricted by the respective stripper and carrier construction. Known cooling water pipes equipped with nozzles are disadvantageous in that they are each individually connected with cooling water feeds and are each connected by a plurality of connecting locations with the carrier construction receiving them. Moreover, the direction of water emission from the nozzles causes problems. The cooling effect of the lowermost pipe is improved by directing the nozzles obliquely upwards.As a result, there is the danger, at least in the case of cooling water pipes associated with the lower roller, of water build-up underneath the stripper, which in certain circumstances may raise the stripping so that it lifts off from the circumference of the roller and into the path of the head end of a band running out. Changing of the arrangement of the nozzles is difficult, since one of the cooling water pipes has to be taken out and replaced by another with a different nozzle arrangement.

According to the present invention there is provided a rolling apparatus comprising two cooling water dispensing devices each associated with a respective roll and each comprising a rigid box-shaped water container provided at a side thereof facing the respective roll with a plurality of nozzles arranged to direct cooling water from the container to the roll, the containers being spaced one above the other and each provided with support means supporting a respective stripper co-operating with the associated one of the rolls.

It has proved to be advantageous to equip the roll facing surface of each container with recesses covered over by detachable and exchangeable cover plates in which the nozzles are provided, so that the number of nozzles may be easily varied as needed.

The cross-section of the box-shaped container may be subdivided by at least one internal wall into at least two compartments each of which feeds at least one row of nozzles, wherein the compartments are separately fed with cooling water so as to enable selection of the number of rows from which cooling water is to issue. Thus, one or more internal walls which extend parallel to the axis of a roll may partition off rows of nozzles arranged vertically -above one another, and/or internal walls extending transversely to the axis of a roll may subdivide the rows in their logitudinal direction and thereby enable the width of the cooling region to be adapted to that of the stock to be rolled.

It is preferable to provide the lower container with a bearing pan for the lower stripper, while the upper container is provided with a carrier pan for the engagement of a hook of the upper stripper.

An embodiment of the present invention will be more particularly described by way of example and with reference to the accom panying drawing, which is a schematic vertical section of part of a rolling apparatus according to the said embodiment.

Referring now to the drawing, there is shown an upper working roller 1 and a lower working roller 2 of a four-high fmishing stand of a hot strip mill. Carrier brackets 3 and 4, which are bridged over by box-shaped containers 5 and 6, are arranged downstream of the working rollers 1 and 2 with respect to the direction of rolling through the rollers. These containers, which are of trapezoidal or rectangular cross-section, are made by welding together planar members. The container 6 has a flank 7 facing the working roller 2 and is provided with rows of openings which are sealingly covered over by a cover plate 8, which in its turn is provided with horizontal rows 9, 10 and 11 of nozzles. The container 6 is provided at both ends with connecting pipes 12, one end of which terminates in a connecting flange 13 connected with a cooling water feed.

The container 6 has a cover plate centrally provided with a pan 14, which supports a spigot of a stripper 15, which is provided with an exchangeable tongue 16 bearing against the circumference of the working roller 2 underneath the rolling gap. Thereby, the container is not only used for feeding the nozzles, but also supports the lower end of the stripper 15, the front end of which, by virtue of its own weight, bears firmly against the circumference of the working roller.

A similar arrangement is made for the upper working roller 1. The carrier brackets 3 are bridged over by a box container 5 having a flank 17 provided with openings and covered o over in the region of the openings by a cover plate 18, which is provided with rows 19 of nozzles. An upper stripper 20 provided with a hook 21, which engages in a pan 22, is arranged at the bottom of the container 5. To avoid the stripper 20 parting too far from the periphery of the working roller 1, the stripper is provided at its end spaced from the roller 1 with a pressure member 23, which bears against a push rod 24 connected with the rear side of the container 5.The container 5 is also provided at both sides with connecting pipes 25 for the feed of the cooling water so that the full cross-section of the container is available for the cooling water feed and for the distribution thereof to the individual nozzles. The inclination of the flank 17 enables the nozzles to be deflected downwardly in the direction of the rolling gap.

The embodiment shown in the drawing clearly illustrates that almost the entire available space is used for the feed of the cooling water and that furthermore relatively large flanks are available for the reception of the nozzles. The number of the nozzles can therefore be chosen in accordance with the cooling effect to be attained. The exchangeability of the cover plates 8 and 18, respectively, also permits the cooling effect to be adapted to other conditions at any time with relatively small effort. Thus, for example, a cover plate can be provided with three rows of nozzles in respectively close arrangement, while two rows of nozzles can be sufficient and/or the nozzles can be provided at wider spacing within the rows when, for example, only slight cooling is required.It is equally possible to provide rows of different lengths for different widths of stock to be rolled having regard to the fact that the stock heats up the rollers substantially only in the region thereof contacted by the stock.

To attain different cooling effects, it is, however, not necessary to exchange the cover plate; there is also the possiblity to so subdivide the containers by transverse walls that compartments or partial sections communicate with at least one first row of nozzles and one or two further compartments communicate with at least one further row of nozzles. In the drawing, the container 6 is provided with a transverse wall 26, which is illustrated by dashed lines and which separates the row 9 of the nozzles in respect of its water supply from the rows 10 and 11. In this case, water is supplied to the compartments individually.

The connecting pipe 12 may open out into the lower compartment of the container 6, while a connecting pipe, provided at the opposite end and arranged in front of the plane of the drawing, is led through the transverse wall 26 up to the upper compartment. When symmetrical water supply is required, then two pairs of connecting pipes may be provided at each of the two ends, one pipe of each pair terminating underneath the transverse wall 26 and the other pipe being led through it. It is, however, also possible to feed only one of the compartments by incorporating valves in the transverse wall 26 or in the pipe bends connecting the compartments. This permits the smaller compartment to be controllably operated without it being necessary to increase the number of the connecting pipes.

The possibility furthermore exists of arranging transverse walls substantially parallel to and symmetrically of the side plane in order to limit the length of the effective part of each of the rows of nozzles. When rolling relatively narrow stock, the outer regions of the rows of nozzles can be switched off so that substantially only the region of the working roller actually heated up by the stock is cooled.

A further stiffening of the container can be effected, externally of the region having the cooling water inlet, by incorporating further members which prolongate the container bottom and rear flank, which extend over the length of the container and which are connected with the carrier brackets 3 and 4, respectively.

It is preferable that the rows of the nozzles within the cover plate are arranged closely beside one another so that cooling water from the nozzles impinges on the roller surfaces in re regions thereof downstream of the nip of the rollers without it being necessary to specially set the nozzles obliquely or, for example, direct them obliquely from below towards the stripper 15. As a result, there is satisfactory cooling of the rollers in regions thereof which have the highest surface temperature without an oblique setting of the nozzle arrangement In the case of the cooling equipment arranged downstream of the upper roller 1, however, an oblique setting of the nozzles is retained as the water running away loads the stripper 20 in any case and this loading is absorbed by a push rod 24.

An advantage of the above described embodiment is that in place of several cooling water pipes each of low inherent rigidity there is provided a stiff, stable boxshaped container which is fastened in a simple manner and a few points, is easily produced from planar metal sheets, operates with a lower number of water feeds and may support a stripper, so that a separate support is superfluous.

WHAT WE CLAIM IS: 1. Rolling apparatus comprising two cooling water dispensing devices each associated with a respective roll and each comprising a rigid box-shaped water container provided at a side thereof facing the respective roll with a plurality of nozzles arranged to direct cooling water from the container to the roll, the containers being spaced one above the other and each provided with support means supporting a respective stripper co-operating with the associated one of the rolls.

2. Apparatus as claimed in claim 1, wherein the upper dispensing device has a trapezoidal cross-section in a plane generally transverse to the axis of its associated roll.

3. Apparatus as claimed in either claim 1 or claim 2, wherein the nozzles of each container are arranged in rows on a plate covering the said side of the container.

4. Apparatus as claimed in claim 3, wherein each plate is detachably mounted on the respective container.

5. Apparatus as claimed in either claim 3 or claim 4, wherein each dispensing device is so divided into compartments that the space enclosed by one compartment communicates with at least one first row of nozzles and the space enclosed by another compartment communicates with at least one second row nozzles, the apparatus further comprising valve means to regulate cooling water through a least one of the compartments.

6. Apparatus as claimed in claim 5, wherein the at least one first row of nozzles is disposed above the at least one second row of nozzles.

7. Apparatus as claimed in any one of claims 3 to 6, wherein each dispensing device is so divided in compartments that the space enclosed by one compartment communicates with some of the nozzles in each row and the space enclosed by another compartment communicates with at least some of the other nozzles in each row.

8. Apparatus as claimed in any one of the preceding claims, the support means of each dispensing device comprising a bearing surface supporting the respective stripper and the stripper associated with the upper dispensing device being provided with a hook member which engages the bearing surface of the upper dispensing device.

9. Apparatus substantially as hereinbefore described with reference to the accompanying drawing.

10. A four-high finishing stand of a hot strip mill comprising apparatus as claimed in any one of the preceding claims.

11. A strip rolling mill comprising apparatus as claimed in any one of claims 1 to 9.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. roller actually heated up by the stock is cooled. A further stiffening of the container can be effected, externally of the region having the cooling water inlet, by incorporating further members which prolongate the container bottom and rear flank, which extend over the length of the container and which are connected with the carrier brackets 3 and 4, respectively. It is preferable that the rows of the nozzles within the cover plate are arranged closely beside one another so that cooling water from the nozzles impinges on the roller surfaces in re regions thereof downstream of the nip of the rollers without it being necessary to specially set the nozzles obliquely or, for example, direct them obliquely from below towards the stripper 15. As a result, there is satisfactory cooling of the rollers in regions thereof which have the highest surface temperature without an oblique setting of the nozzle arrangement In the case of the cooling equipment arranged downstream of the upper roller 1, however, an oblique setting of the nozzles is retained as the water running away loads the stripper 20 in any case and this loading is absorbed by a push rod 24. An advantage of the above described embodiment is that in place of several cooling water pipes each of low inherent rigidity there is provided a stiff, stable boxshaped container which is fastened in a simple manner and a few points, is easily produced from planar metal sheets, operates with a lower number of water feeds and may support a stripper, so that a separate support is superfluous. WHAT WE CLAIM IS:

1. Rolling apparatus comprising two cooling water dispensing devices each associated with a respective roll and each comprising a rigid box-shaped water container provided at a side thereof facing the respective roll with a plurality of nozzles arranged to direct cooling water from the container to the roll, the containers being spaced one above the other and each provided with support means supporting a respective stripper co-operating with the associated one of the rolls.