SU801914A1 - Workroll mainly for bar rolling mill - Google Patents

Description

one

The invention is related to the production of rolling mV, namely: to wide mills with a wide assortment, the right machines and heavy transport devices.

Designs of rolls of section mills are known, consisting of an axis and a row of bandages l.

Also known is a work roll, which contains a bandage with creeks, mounted on a barrel of the bearing axis, and intermediate in sulks, moreover, streams are made on the outer forming intermediate sleeves and barrel of the bearing axis. In order to increase the rigidity, liners 21 are installed in the brooks of the intermediate bushings and the bearing axle,

A disadvantage of the known roll design is that it does not provide high precision rolling at high rolling speeds; currently reaching 60 m / s, when vibrations and oscillations of the roll are especially great, its bending during the rolling process inevitably disrupts balancing Since the magnitude of the bend and the imbalance that arises is variable and depends on many factors: temperature, rolling size, roll wear.

tension between the cells, it is impossible to take this bend into account in advance.

The invention aims to improve the rolling accuracy by reducing vibrations at high rotational speeds of the roll.

This goal is achieved due to the fact that on the inner surfaces of the band and the intermediate sleeve with

On both ends, annular undercuts are made, filled 0.2-0.5 in length with balls, and the space between them is made up of liquid, for example, oil.

FIG. 1 shows a calibrated composite roll in section; in fig. 2 - section A-A.

An intermediate sleeve 2 is mounted on the carrier axle 1, and a bandage 3 is attached to it. In the brook x intermediate sleeve 0 and 2, liners 4 and 5 are installed, made in the form of half-rings. In the stream axis 1 installed sleeve 6, is also made of two halves. The inserts 4 and 5 and the sleeve 6 are provided to ensure the rigidity of the system 5. In the band 3 and the intermediate sleeve 2 concentric with the streams are made annular undercuts 7, filled to 20-50% of their length with balls 8, and the rest of the space with a liquid, for example

oil The annular recesses 7 are sealed against oil outflow by seals 9 and are located symmetrically with respect to the rolling axis.

Filling the annular recesses 7 with oil is carried out through the openings 10 closed by plugs 11. With a stationary roll, the balls 8 are located in the lower part of the recesses 7 (Fig. 2).

During rotation, the balls under the action of a tangential component of the centrifugal force move in the direction opposite to the center of gravity of the unbalanced system of forces, and occupy a position in which a complete equilibrium of the entire system is achieved and the Valia beats are eliminated.

Due to the concentric implementation of undercuts 7 and their symmetrical arrangement with respect to the rolling axis, full dynamic stressing of the roll is achieved and longitudinal vibrations are excluded from any changes in the original geometrical shape of the roll.

If it is necessary to switch to another rolled stock, such as a circle, band 3, it is bent, inserts 4 and 5 are removed from the front bushing 2 and brooks from streams. In this case, the roll axis is converted into a conventional roll and, due to a decrease in diameter, the effect of the unbalanced masses on the rolling accuracy is significantly reduced.

The amount of filling of the sharoche's circular undercuts of 0.2-0.5 length depends on the degree of imbalance of the roll. It is usually determined empirically on the basis of determining the amount of unbalance of the roll, which is characterized by the displacement of the center of gravity from the center of rotation of the roll.

The & weight mass of balls that blow the annular recess can be determined:

Q tP-ct / R,

where P is the mass of the roll;

a - the displacement of the center of the body from

the center of rotation of the roll R is the radius of the annular undercut.

Claims (2)

1. US patent 3842471, cl. 72-247,1971. 2. Authors certificate of the USSR 543438, cl. B 21 B 27/02, 1975. ut {Rft./