SU1276386A1 - Arrangement for cooling and lubricating rolling mill rolls - Google Patents

Description

The invention relates to the processing of metals by pressure and can be used on cold rolling mills in four-roll cages.

The aim of the invention is to reduce roll wear and improve rolling quality.

FIG. 1 shows the device section; in fig. 2 - the same in terms of; in fig. 3 is a section A-A in FIG. 2; in fig. 4 - the unit of rotation of the inner cylinder relative to the longitudinal axis (section BB in Fig. 2).

The device contains a collector 1 (Figs. 3 and 4), divided into sections by transverse partitions 2 (Fig. 2), fittings 3 for supplying the emulsion through hoses 4. The collector is equipped with a turning unit including directions 5 with notches 6, supports 7, mounted on the beds of 8 rolling stands. Directions 5 to the supports are fastened with screws 9. The collector in the directions 5 is fixed with screws 10.

The collector 1 is made of two cylinders 11 and 12 placed one inside the other with a mixture of axes indicated by the position 13. There is a radial clearance between the longitudinal axes of the cylinders.

Each cylinder has cuts along the way, to her. The cylinder 11 has a notch 14, the cylinder 12 has a notch 15. The notches 14 and 15 are directed to one side. The axis of the inner cylinder 12 is mixed in the direction of the notches at a distance of 13. The edges of the notches form a w, spruce nozzles 16 and 17. The length of the nozzles of the collector is indicated by the position 18, the length of the roll barrel by the position 19.

The cylinder 12 is installed in the cylinder 11 with the possibility of rotation in the sleeves 20, placed in the transverse partitions 2 and fixed with screws 21. The device also includes a work roll of the mill 22, an anvil roll 23, a strip 24.

The device works as follows.

Through the hoses 4, the emulsion is fed to fittings 3, from where it enters the collector sections 1 into the radial clearance 14 between the cylinders 11 and 12. Next, the emulsion under pressure exits the slot nozzles 16 and 17, while the slot nozzle 16 guides the emulsion to the surface of the support roll 23, and the slotted nozzle 17 is directed onto the surface of the work roll 22, thereby providing cooling of the roll barrel. In the process of bending around the surface of the cylinders 11 and 12, the emulsion acquires a direction that forms a fan stream that encloses the surfaces of the roll barrels, as shown in FIG. one.

By rotating the cylinder 12 relative to the cylinder 11, when the edges of the cylinder 12 are displaced into the interior of the cylinder 11, the amount of emulsion supplied to the support and work rolls is redistributed by changing the cross section of one of the slit nozzles. That is, depending on the rolled stock, the amount of emulsion supplied to the workers is increased.

rolls, reducing on the support, or vice versa. In this case, the fan character of the emulsion jet remains unchanged.

With the help of the guides 5, the collector is installed at the required distance from the rolls and fixed with screws 9 in the supports 7. When replacing the rolls, the collector with the guides is extended away from the rolls, loosening the screws 9 passing through the slots 6. The screws 10 fix the collector in .

The regulation of the thermal profile of the rolls is carried out by redistributing the amount of emulsion supplied to each collector section.

The proposed device allows to increase the mill productivity and the quality of rolled strips. An emulsion falling between two cylinders that are displaced one relative to the other acquires a smooth trajectory, in the form of a jet section in the form of a fan. Moreover, the jet plumes leaving the nozzles 16 and 17 (Fig. 1) tend to approach in the contact zone of the support and work rolls. Emulsion jets emanating from the nozzles wash the surface of the rolls in a direction close to the tangential direction. This captures a larger surface area of the rolls and eliminates splashing of the emulsion. The length of the nozzles of the collector is set equal to 1.05-1.15 of the barrel length.

Increasing the length of the collector nozzles compared to the length of the roll barrel allows the roll to be cooled not only from the surface of the barrel, but also from its ends, which contributes to the cooling intensity.

Reducing the length of the nozzles collector less than 1.05 of the length of the roll barrel leads to the fact that the emulsion does not fall on the end sections of the roll mill roll. At the same time, the intensity of the heat sink decreases and the productivity of the mill decreases. As the total length of the nozzles is increased to more than 1.15 the length of the roll barrel, a lot of the emulsion gets onto the bearing assemblies and splashes out before reaching the target. The cooling intensity of the rolls in this case also decreases, and this forces a reduction in the rolling speed, reducing the productivity of the mill.

The fixed rotation of the inner cylinder of the device relative to the outer one provides a simple and effective redistribution of the amount of emulsion supplied to the working and supporting rolls, which allows to establish the optimal thermal mode of the rolls when rolling a specific strip size.

Improving the cooling conditions of the rolls due to the proposed device allows to intensify the rolling process by increasing individual reductions and increasing the rolling speed, which improves the productivity of the mill.

Claims (2)

Claim 1. A device for cooling and lubricating rolling rolls, comprising a collector consisting of a hollow cylinder with a slot cut along the generatrix, divided by transverse partitions into sections, emulsion fittings connected to each section, a collector rotation unit, characterized in that, for the purpose of to reduce roll wear and improve the quality of rolled products, it is additionally equipped with a hollow cylinder of a smaller diameter with a slit cut along the generatrix, while the cylinders are placed one in the other with the displacement of their longitudinal axes and open yty their notches in one direction. 2. The device according to π. 1, characterized in that the cylinder of a smaller diameter is mounted with the possibility of a fixed rotation ¹⁵ relative to its longitudinal axis. L Cabbage soup g. 2 A - A