DE1272862B - Device for lubricating and cooling the surface of four-high rolling mill rolls - Google Patents

Description

Device for lubricating and cooling the surface of four-high rolling mill rolls The invention relates to a device for lubricating and cooling the surface of four-high mill rolls with coolant tanks adjacent to work rolls, which cover each one circumferential arc of the roller and approximately its entire width Adjacent surfaces only closed off by the respective part of the roller surface are and each have coolant inlets in their lower regions.

In many cases, good lubrication and especially one determines good cooling of the rolls the quality of a rolling mill equipment. The rolling speed may be limited by the temperature characteristics of the rolls, and the uniformity of the roll gap can only be achieved by keeping the temperature constant, i.e. essentially very good cooling.

It is known to cool rollers from the inside, but not all of them Rolling is possible. It is also known to cool the rollers from the outside by a coolant is sprayed onto the roll surface through nozzles; here results However, there is an insufficient cooling effect, the risk of spraying the rolling stock and finally an annoying mist formation, which is especially common when using oil as a Coolant is harmful.

It is also known to each have a circumferential arcuate piece of the rollers directly to be used as a boundary wall of a cooling bath. Each surface point of the relevant The roller comes into full contact with the cooling bath over part of its rotation. In the case of four-high rolling mills in particular, however, the size of this arc on the work roll, at which the coolant acts, very limited between the rolling stock and the backup roll and the cooling effect is therefore poor; also have the known devices the disadvantage that despite a complicated structure with regard to the coolant supply and drainage coolant that partially clings to and from the roller is carried beyond the circumferential curve occupied by the coolant bath, according to is lost outside or gets onto the rolling stock.

The invention is intended to create a lubricating and cooling device that achieve a maximum cooling effect with simple means allowed to achieve.

The device according to the invention for lubricating and cooling the surfaces of quarter-rolling mill rolls according to the type explained at the beginning is characterized by this from that the container in its height extent the area of the respective work roll exceed the line of contact with the backup roller and also with of the respective backup roll one through a part of the cylindrical surface thereof have closed abutment surface and that each container on its roller facing away The front is limited by an overflow wall, on the outside of which one extends over the arranged over the entire width, open at the top, overflow bowl with side drains is.

So it is not only achieved the advantage that the cooling liquid extends to the line of contact of the work roll with the backup roll, but above it In addition, it also cools the back-up roller, which thus has an additional heat dissipation function takes over. The one carried upwards by the support roller and running off from it or sprayed-off coolant can easily be returned to the container and the overflow bowl.

The channel-shaped overflow tray preferably has side walls that are lower than their walls parallel to the roller axis. This becomes a allows easy lateral drainage of the coolant, on both sides of the rolling stock flows by without wetting it.

It is useful above the upper overflow bowl along a surface line the upper support roller arranged a squeegee. This bar touches on that this point still on the outer surface the upper back-up roll Coolant from so that it runs into the upper overflow bowl and not because of the Centrifugal force is thrown off tangentially and roughly onto the path of the rolling stock could get.

To optimize the evenness or any desired unevenness of the roll gap can advantageously each container in a manner known per se be divided along the width into chambers that can be fed separately with coolant whose side-by-side rear wall sections arranged the common overflow tray is. This construction, which is particularly evident in the cooling device according to the invention can be used easily and without significant additional effort, allows to vary the cooling effect across the width of the roller by having the different Chambers are flushed with different coolant flow rates. Because the containers are open at the top and a common overflow tray for all chambers a container is provided, no special measure is required for the discharge the quantities of coolant supplied to the chambers at different speeds to become.

It has proven to be particularly useful to map the onto the roller surface exposed edge parts of the plastic container.

Further advantages, details and features of the invention result from the following description. In the drawing is a four-high rolling mill that is equipped with a lubricating and cooling device according to the invention, schematically and, for example, FIG. 1 shows FIG. 1 the rolling mill in side view, thus seen at right angles to the running direction of the rolling stock, F i g. 2 the lubrication and cooling device according to F i. G. 1 from the front, i.e. in the direction of the rolling stock seen.

In Fig. 1, the two work rolls are denoted by T and Ta, the two backup rolls are denoted by A and Aa and the rolling stock under processing is denoted by P.

The lubricating and cooling device consists of two prism-shaped coolant containers 1, la, which are delimited on the outside by front walls 2, 2a and on the inside by the surface of the work rolls T, Ta and the backup rolls A, Aa. These containers are divided into chambers 5, 5 b, 5 d ... or 5 a, 5 c, 5 e ... , each of which is at its lower part by a tube 4 or 4 a, 4 b, 4 c , 4 d ... is fed with liquid. This independent supply makes it possible to supply the liquid serving as coolant to each chamber in a separately selectable, variable amount and temperature; if necessary, the feed can be controlled automatically based on the effect of one or more of the prevailing factors influencing the heating of the rolls, the straightness, the evenness and the constant thickness in both the longitudinal and transverse directions, i.e. everything that contributes to uniform quality of the rolling stock being processed.

An overflow tray 6 or 6a is attached to each container. This overflow bowl itself is not divided by partitions, but serves as a return channel for the liquid passing over the walls of all the chambers of the container, which is then drained off to the side (Fig. 2) so that it does not hit the rolling stock under processing; and which is collected in order to be fed back into the cycle after filtration. For this purpose, the overflow bowl front wall 3 or 3 a is higher than the side walls 7 or 7 a, while the container side walls 8 and 8 a have a medium height.

A squeegee 9 on the upper pressure roller A leaves that on the roller Adhering excess liquid drain into the overflow tray 6 and prevents it the centrifugal splashing that otherwise occurs at high speeds the material to be rolled or just rolled.

Since the side walls 8, 8a of the container 1, la and the partition walls of the chambers 5, 5a ... do not touch the rollers, leakage may occur either from one chamber to the other or at the bottom of the chambers; However, these losses are of minor importance in relation to the total flow rate.

In the system according to the invention, the contact takes place between liquid and roll along a very large circumferential arc of the work roll and also one Part of the back-up roll instead and allows a significant heat exchange.

At least the parts of the container 1, 1 a, optionally with the Rollers could come into contact are made of a material such as. B. plastic, manufactured that does not involve the risk of changing the roll surfaces or even to damage it.

Claims (4)

Claims: 1. Device for lubricating and cooling the surface of four-high rolling mill rolls with coolant tanks adjoining work rolls, which are closed only by the respective roll surface part on the respective circumferential arc of the roll and approximately its entire width and which are each closed in their lower areas Have coolant inlets, characterized in that the height of the containers (1, la) exceeds the area of the respective work roll (T, Ta) beyond its line of contact with the support roll (A, Aa) and also with the respective support roll (A, Aa) ) have an abutment surface closed off by a part of their cylindrical surface and that each container is delimited on its front facing away from the roller by an overflow wall (2, 2a), on the outside of which an overflow bowl (6, 6a) extending over the entire width is open at the top is arranged with side drains. 2. Device according to claim 1, characterized by lower side walls (7, 7a) of the channel-shaped overflow tray (6, 6a) compared to the walls (2, 3, 2a, 3a) parallel to the roller axis. 3. Device according to Claim 1 or 2, characterized by one above the upper overflow bowl (6) Stripping bar arranged along a surface line of the upper support roller (A) (9). 4. Device according to one of claims 1 to 3, characterized in that each container (1 or la) in a known manner according to the width in separately feedable with coolant chambers (5, 5 b, 5 d , etc. or 5 a, 5 c, 5 e etc.), on the adjacent rear wall sections of which the common overflow tray (6 or 6a) is arranged. Considered publications: German Patent Nos. 914725, 742991, 608 096, 300 846.