SU761047A1 - Apparatus for counter bending of work rolls of four-high rolling mill - Google Patents

Description

The invention relates to rolling and is intended for use on sheet four-roll continuous hot and cold rolling mills.

Known devices for bending 5 work rolls of a four-roll rolling stand, in which the profile of the roll gap is controlled by acting on the main ones. or additional pillows of the work rolls by the hydraulic system [1]. The disadvantage of this device is the great complexity of execution.

It is also known a device for anti-bending of the work rolls of a four-roll rolling stand, each of the rolls of which 15 has a barrel and necks containing the sleeves mounted on the necks of the work rolls and resting one another on the sleeves [2].

The sleeves are made eccentric, which provides for the necessary thrust of the rolls during their mutual rotation 20.

In these devices, the bending forces act directly through the bearings of the work rolls, which causes a rapid failure of the bearing unit 25, reducing the effectiveness of the application of the bending systems.

The purpose of the invention is to increase the service life of bearings workers

rolls four roll roll stand 30

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by reducing the impact of anti-bend systems on the bearing assembly.

This goal is achieved by the fact that in the device for bending of the work rolls there is a four-roll rolling stand, each of which has rolls and necks, and containing work rolls mounted on the necks and supporting one another, the sleeves are tapered with different taper one of the sleeves is fixed, and the other with the possibility of reciprocating movement along the neck from the drive, while the drive can be made in the form of a hydraulic cylinder and in Vrátna diaphragm spring.

FIG. 1 shows a general view of the device; in fig. 2 - section A — A of FIG. one.

The device includes working lower 1, upper 2 and 3 supporting rolls. Between the barrel of the upper work roll and the cushion 4, the conical sleeve 5 is fixedly mounted. On the neck of the lower work roll there is a cup-shaped spring 6, a tapered bushing 7, a thrust bearing 8 with the housing 9 and a cushion 10. Hydraulic drive with plungers 11 is mounted in the pillow of the lower work roll, thrust bearing 12 and angular contact ball bearing 13.

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In the cushion of the upper work roll is placed angular contact bearing 14. Pillows 4 and 10 are fixed in the axial direction on the necks of the rolls. The conical sleeve 7, the bearing 8 and the housing 9 have the ability to move along the axis of the roll neck. The taper of the sleeves 5 and 7 is the same and is about 1-2%. The bushings are installed with cones in different directions and are in contact with each other along the entire length of the generator.

To ensure the nominal rolling mode, the average diameters of the sleeves 5 and 7 are selected so that for a given rolling force and calculated roll profiles, the pressing force of sleeves 5 and 7 has a predetermined value with the average position of the sleeve 7 relative to the sleeve 5, and the gap between the working rolls has the specified profile .

The device works as follows.

When the strip is fed into the rolls and the rolling mode deviates from the nominal one to restore the specified gap profile between the work rolls, the conical sleeve 7 moves in the axial direction. Due to the reverse taper of the sleeves 5 and 7, the distance between the axes of the rolls at the edges of their barrels changes by an amount proportional to the movement of the sleeve 7, and this is achieved by adjusting the slot profile. The sleeve 7 is moved towards the roll barrel by a drive, for example hydraulic, using the plungers 11 through the bearing housing 9 and the thrust bearing 8, in the opposite direction with the help of disc springs 6. The thrust bearing 12 prevents the cushion 10 from displacing in the axial direction. Angular contact bearings 13 and 14

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perceive the load, not related to the operation of the proposed device. Thus, the bending force, which in this case is the pressing force of the sleeves 5 and 7, forms a closed power circuit, bypassing the bearing unit, and this achieves the purpose of the invention — increasing the service life of the work roll bearings of the four-roll mill stand by reducing the influence of the bending system on the bearing unit , - since the efforts required to move the conical sleeve 7, are insignificant due to the fact that the taper of the sleeves does not exceed 2%.

Claims (2)

Claim 1. Device for anti-bending of the work rolls of a four-roll rolling stand, each of the rolls of which has a barrel and necks, containing sleeves mounted one on another of the rolls, characterized in that, in order to increase the service life of the bearings, the sleeves are made conical, tapering different sides, with one of the sleeves fixed and the other with the possibility of reciprocating movement along the neck of the roll from the drive. 2. Device by π. 1, characterized in that the drive is made in the form of a hydraulic cylinder and a returning disc spring.