DE2025626B2 - Device for simultaneous cooling of processing rolls and rolling good in rolling mills with several rolling stands connected one behind the other - Google Patents

Description

The present invention relates to a device for the simultaneous cooling of processing rolls and rolling stock in rolling mills with several roll stands connected in series with at least two processing rollers that continuously process the rolling stock, in the case of the one between the rolling stands each one open at the top, with cooling and / or lubricating liquid, into which the rolling stock is completely and the processing rollers are partially immersed, filled trough element is arranged, and in which the Cooling and / or lubricating liquid flowing continuously via nozzles flows off via an overflow lying parallel to the rolling direction and forming a boundary wall of the tub element.

Such an arrangement is mainly intended on the one hand to protect the rolls during continuous operation and largely to prevent deformations caused by heating and on the other hand to withdraw the rolling stock from being heated up too intensely. Furthermore, the presence of the cooling and / or lubricating liquid along the entire machining section allows a noticeably better surface quality of the rolling stock, also in that the rolling stock is completely protected from the outside environment and oxidation is practically impossible .

Of the mentioned type (German Ofi'enlegungsschrifi I 452 028) is a disadvantage of the known device the Gesamtaufbaii and ^An>: .amgdcr Wannenelemenie that plai / .anuvendig uüu the operating conditions not conform '; ihig .lind.

These well-known tub elements consist essentially of large, or ^ feven; ί. 1ι; ϋκτη. which: lateral longitudinal walls at the ends are cut out according to the profile of the processing rollers in order to close as much as possible between the processing rollers of two adjacent rolling stands.

To form a trough element for receiving the cooling liquid, which, however, allows the free rotation of the Processing rollers not obstructed. The overflow formed by the longitudinal walls of the tub elements is essentially determined by the height of the longitudinal walls set from the tub bottom and can only be very little by adjusting the inflow of the Cooling liquid are regulated in relation to the flow rate by the nozzles more or less cooling liquid flows in from the overflow and the

»5 free gaps between the longitudinal walls of the tub elements and the processing rollers flow off. In addition, the nozzles are arranged in the tub elements themselves and have to be provided from the outside through corresponding ones that penetrate the tub elements

ao lines are fed.

Due to the voluminous and structurally complex training, this known device is only at applicable to such rolling mills in which the individual rolling stands are arranged oristest and et Any changes of the roll stands or the maintenance rolls for the purpose of maintenance work or practically out of the question when transitioning to other machining operations. Once these tub elements have been installed between the roll stands the processing rollers can only be removed after removing the tub elements themselves possible, but because of the dimensions and weight of the tub elements and the need to connect the connecting lines to the cooling liquid To have to solve the nozzles in each case not at all or can only be carried out in a very laborious manner and with a significant amount of work.

In modern rolling mills with several rolling stands connected in series and high rolling speeds, however, there is a need to renew the processing rolls from time to time, which must be done in the shortest possible time so that the dead times in the rolling stock production can be kept to a minimum. For this purpose, the rolling stands are detachably mounted on a base frame so that they can be removed together with the rollers. Such an arrangement cannot be used in the presence of a cooling device of the type described above .

In the known cooling device of the type mentioned, the working conditions for the rolling stock in the area between the roll stands, in particular the immersion depth and therefore the protective jacket against oxidation surrounding the rolling stock in the area between the roll stands, are practically unchangeable. The rolling stock is therefore always immersed in the same volume of liquid and under the same protective conditions. Coating these can be changed, e.g. B. because for a certain machining, greater immersion depth is required to prevent Oxydut ion of the rolling stock more reliably, then this must be done in a corresponding manner by additional valves that the inflow of the cooling liquid wedge

ι''ό in be / .iu 'regulate the drain., but at least none allow greater immersion depth than they do through the Walls of the tub elements is determined.

Thereby, ai'cr must be between for each section

025 626

the rolling stands have their own valves, which is the case with many rolling stands linked one behind the other becomes too costly.

However, it was proposed (German Offenlegungsschrift 1427 912), when cooling a heated metal strip in rolling mills, the cooling liquid for the metal band can be adjusted with an adjustable overflow, this adjustment is made by a sliding tube that is more or less in «: Inserted into a chamber filled with the coolant will. The effect of this overflow is, however, subordinate to the setting of the corresponding valves, so that it is also possible to disable the overflow itself. Such a control device would be for a rolling mill with several series-connected roller grooves unsuitable and they would build the entire cooling device ι make, since additional valves are always necessary, but without that remarkable and mainly economic vuilcile eizicli will.

From the German patent specification 81919 it is finally still known, during the cooling of rolled cast iron to regulate the coolant level in the tub elements.

The object of the present invention is now to provide a device of the type mentioned at the beginning zn, in which the tub elements for the cooling and / or lubricating fluid are designed so that they are sealingly connected to the roll stands are nevertheless easily detachable in order to allow quick and easy removal from the roll stands, and in which also the working conditions for the rolling stock, in particular the immersion depth of the same, in can be changed easily and without additional valve control.

This object is solved in that the trough elements out of guides which are rigidly attached to the mutually facing sides of the rolling stands, and überbrükkenden from the \ n rolling direction remaining gaps of the guides, are made easily detachable wall portions, of which the KühJ- and / or Schmierflüssigkeitsüberläufc forming ends are continuously adjustable in height.

With such a device, it is therefore quite simply sufficient on the mutually facing sides the roll stands to arrange only guides and these by adjustable V / andungteilec in the guides to connect, which at the same time form a St.-uraum for the coolant and / or lubricant and as Re gclelement are used for the overflow height. The tub element, which is adjustable on guides, can be used at any time can be easily removed to clear and remove all roll stands for special work. The tours support the acceptance of the WaniK elements and enable them at the same time a sealing connection / between the wall parts of the tub elements and the sides of the rolling element. this connection not being / between walling lines and rotatable machining rollers, as with the known cooling device. the Fact that the wall parts themselves with their finding form an adjustable upper loudness for the coolant and / or lubricant liquid makes the use of Sleiierungsveniücn and additional lines to the Tub cements unnecessary. something special; is favorable for the removal of the tub elements. The dip depth c becomes unmnelkii · ι: ι ei in a simple manner determined by the height of the ends of the wall parts and can therefore be varied over a wide range, which further increases the application possibilities of the device and in any case a sufficient one

Immersion depth allowed to be sure to jine To be able to prevent oxidation of the rolling stock.

In a preferred and particularly simplified embodiment of the invention it is provided that the detachable wall parts consist of metal strips

hen, which are arranged displaceably in two arc-shaped guide grooves provided on the guides are.

Due to this design, the device is particularly for the extraordinary simplicity

^X 5 rolling mills are suitable with a larger number of rolling stands connected in series. It should also be taken into account that the removal of the metal strip is also facilitated by the fact that during its displacement in the guides at the same time

^ao also the overflow height was veriniiiucil and the decrease of the metal strip takes place when the tub element is emptied, which is not possible with the known device.

The invention is described below on the basis of a

^a 5 preferred embodiment with reference to the accompanying drawings. 1 shows, in a schematic view, a plurality of roll stands equipped with the device according to the invention,

F i g. 2 a tub element in cross section,

3 shows the device between two adjacent ones Roll stands in longitudinal section along the roll axis, Fig. 4 on a larger scale a detail of Fig. 2,

Fig. 5 d. Detail according to FIG. 4 in front view and

6 shows a view of FIG. 4 in the direction of arrow VI.

According to the drawing, the device is on a Rolling mill with three back-to-back Roll stands 1 attached, each three, arranged at angles of 120 "around a rolling axis and against this axis have converging machining rollers. However, the roll stands can only have two have cooperating processing rollers. The roll stands are by means of dovetail guides 3 removably attached to a bench 2.

Between a roll stand and the neighboring one, trough elements 4 which are open at the top are arranged, which are filled with the cooling and / or lubricating liquid into which the rolling stock, for example wire rod, is completely immersed and the processing rolls are partially immersed. Each trough element consists of a pair of essentially semicircular, mutually spaced flange-shaped guides S, which are rigidly fastened by means of screws 6 to the side walls of the adjacent roll stands 1! and from a thin, easily detachable wall part which bridges the gaps between the guides 5 that remain in the direction of the whale. The wall part preferably consists of a metal strip 7, which is arranged displaceably in arcuate guide grooves 7 ″ of the guides 5. In particular, each guide 5 has a lower curved section (Fig. 2) on the straight line in two Abscbnitle 5a and Sb merges with different length: this flange-like guides are mounted in the vicinity of the roll axis.

The metal band 7 can be manually shifted lengthways in the guide grooves la so that a continuously height-adjustable overflow 8 for the cooling and / or lubricating liquid is formed through the ends of the metal band. In this way it is possible to change the level (8a) of the cooling and / or lubricating liquid in the tub elements 4 as desired.

From Fig. 3, the processing rollers 9, the stationary guides 10 and the guide rollers 11 are partially visible, which are in housings 12 on the inlet sides the roll stands 1 are mounted. The cooling and / or lubricating liquid passes through passages 13 to the guides 10 and the guide rollers 11. The cooling and / or or lubricating fluid at the top and bottom via one or more drainage openings, which are adjustable through Valves or appropriately calibrated bores are regulated or formed.

In order to facilitate the displacement of the metal strip 7, it is fastened to a block 14 at the end opposite that which forms the overflow 8. This block can be displaced between two side guides 15 which are formed in the straight sections 5b and have toothed racks 16 which cooperate with the toothed parts tla of two levers 17 which are articulated at 18 on the block 14. The two levers 17 are arranged symmetrically with respect to a central projection 14b of the block 14 and are connected to one another via a spring 19 which holds the toothed parts 17a with the toothed racks 16 in engagement. At the opposite end, the levers 17 end in curved handles, by means of which the levers can be guided towards one another, in order in this way to bring the tooth parts 17 a out of engagement with the toothed racks 16.

At the projection 14a is with four screws 20 one

Plate 21 is attached, which serves to hold the block 14 on the side guides 15. The metal tape 7 is attached to the block 14 with a transverse rod 22 with screws 2 "^. In order to facilitate control of the levels <Ane partition 24 on one side of guide 15 and a pointer 25 is provided (Fig. 5) on the disk 21.

If you manually move the metal strips 7 between the roll stands, you can in the Most expediently change the level 8a of the cooling and / or lubricating fluid in such a way that

^X 5 the rolling stock is completely or partially immersed. If the rolling stock is completely submerged, it is completely protected from contact with the atmospheric gases and oxydalionic ions are therefore avoided.

The displacement of the metal strips 7 takes place through Approach of the two levers 17, which thus the Zahnieile Bring 17a out of engagement with the rack, and the adjustment of the block 14 upwards or Allow down until the one you want on the

* 5 division 24 readable position is reached. When letting go the lever 17 brings the spring 19 the tooth parts 17 "again into engagement with the rack 16 and the block 14 is fixed in the assumed position.

In order to dismantle the roll stands 1, it is sufficient to remove the metal strips 7 together with the blocks 14 to pull out the guides S concerned, whereby the connection of the rolling stands is canceled will.

For this 1 sheet of drawings

Claims (2)

Patent claims: 1. Device for the simultaneous cooling of processing rolls and rolling stock in rolling mills with several rolling stands connected one behind the other with at least two processing rollers that continuously process the rolling, in which between the rolling stands an upwardly open, with cooling and / or lubricating fluid, into which the rolling stock fully immersed and the processing rollers partially immersed, filled tub element is arranged, and in which the cooling and / or lubricating liquid flowing continuously through nozzles flows over an overflow lying parallel to the rolling direction and forming a boundary wall of the tub element, characterized in that the tub element (4 ) from guides (5). which are attached to the facing parts of the roll stands (1 j siarr, and consist of easily detachable wall parts bridging the remaining spaces between the guides (S) in the rolling direction, the ends of which form the coolant and / or lubricant overflows are continuously adjustable in height. 2. Device according to Aiupruch 1, characterized in that the detachable wall parts consist of metal strips (7) which are arranged displaceably in two arcuate guide grooves (la) provided on the guides (S).