SU728960A1 - Method of determining friction moment in sliding-contact bearing assembly with detachable bushings during rolling process - Google Patents

Description

Union of Soviet

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DESCRIPTION

Inventions

TO AUTHOR'S CERTIFICATE

<4) 728,960

USSR State Committee for Inventions and Discoveries (61) Additional to ed. certificate-wu - (22) 3Approved 0410.77 (21) 2532122 / 22-02 with the addition of application No. - (23) Priority -

Published on April 25th, 2008. Bulletin No. 15

Date of publication of the description 30.04.80

(53) UDC 621.771.08 (088.8) (72) Authors of the invention

B. X. Shliomenzon, A. A. Vinnitsky, and P. G. Esyrev

A. A. Narbaev (71) Applicant

Kazakh Polytechnic Institute. V.I. Lenin (54) METHOD FOR DETERMINING THE FRICTION MOMENT IN SLIDING BRACKETS WITH REMOVABLE INSERTS

WHEN RIDING

The invention can be used in the metallurgical industry, in particular, in determining the ’’ net ’moment of rolling. -,

The rolling moment is usually measured with sensors mounted on the spindles of the rolls of the rolling mill. However, in this case the moment (M _nu) as measured on the spindle, is composed of roll moment (M _n) and ^one friction torque (M _it) in the sliding supports of the rolls, which is not always taken into account. To assess the moment of rolling, it is necessary from the measured moment (M _sp ). ·. subtract the friction moment (M _To ) in the bearings of the rolls g:

mn nr 'then

Since the components of formula (1) change their value depending on οτ2θ the magnitude of the pressure of the metal on the rolls, to determine the moment of rolling it is necessary to know the value of M _then at a pressure equal to the pressure of the metal on the rolls (p), corresponding to the value of 25 measured moment (M _sp ) t ie, you need to know the dependence • / A _To -_CH (P) (2)

A known method of measuring the moment of friction in the sliding bearings at 30

ROLLERS roller in rolls, including the removal of the upper roll from the mill, the application of “forces equal to the rolling forces to the supports of the lower roll and measuring the moments on the spindle [1].

Rolls of rolling mills have a weight of up to several tons and the production of their dismantling and subsequent installation is associated with certain difficulties and leads to significant losses of working time of the mill and, consequently, to a decrease in equipment productivity.

A known method for determining the friction moment in sliding bearings during rolling in rolls, including applying to the bearings forces equal to the rolling forces, rotation of the rolls and measuring torques on the spindles [2]. With this method, the rolls of the rolling mill are oiled and pressed against one another. By measuring the torque and the pressing force, a curve M _then - Ch '(P) is obtained. However, this method obviously gives an error on the magnitude of the moment of friction forces of quality between the rollers.

The purpose of the method is to increase accuracy.

This is achieved by the fact that efforts are made to the supports by spreading the liners in the presence of a gap between the rollers, and the sought moment is determined as yo :: ovina measured.

The method is as follows.

Removable liners by force are loaded with forces equal to the rolling forces, while leaving a gap between the rollers, eliminating their contact. Then the rolls are rotated, the torque on the spindles is measured, and the friction moment is determined as half the measured torque.

In FIG. 1 proven rolling mill, side view; in FIG. 2 — same, longitudinal section.

On rolling 'Astana with work rolls 1 and 2, removable bearings 3 and 4 of sliding bearings are installed, and the upper roll is inoperative on the supporting shells 5. Between the trunnions of the lower roll 2 and the supporting shells 5, additional shells 6 are installed, the height of the shells'6 is that when a force is applied through the meso-dose 7 by pressing screws 8 to the liners 3, 4, 5 and the trunnion trunnions 1 and 2, they provide a gap between the rollers. In addition, the mill · has sensors 9 ', for measuring the rolling time of the strip rolling, the rolling forces are perceived only by the working liners 3 and 4, at the moment of friction (M _t0 ) it is formed only on the contact surfaces of the four working liners. When determining the moment of friction in sliding bearings, the applied force acts, in addition, on two supporting 5 and two additional 6 liners, increasing the friction moment by half.

Thus, the friction torque in opo'0 rah rolls (M _it) half the time, measured at the mill with additional inserts ^ · the 'ae min (3)

By changing the pressure on the contact surfaces of the liners with the help of compression screws 8, it is possible to obtain dependence (2), which can be further used to determine the `` pure 2Q th '' 'rolling moment.

The proposed method significantly improves the accuracy of determining the moment of friction in the liners during rolling and allows you to measure the moment of friction directly on the working equipment.

moment.

The moment of friction in plain bearings is determined as follows.

When the mill is turned on, rolls 1 and 2 rotate in workers 3 and 4, supporting 5 and an additional 6 liners. By rotating the pressure screws 8, the upper roller 1 is lowered until the supporting liners 5 lie on the additional liners 6. At this moment, there should be a gap of at least 5 mm between the rollers 1 and 2. The subsequent rotation of the pressure screws 8 creates on the contact surfaces of the trunnion pins 1 and 2 and the liners 3,4 and 5 an effort equal to the rolling force (P), which is fixed by the mesures 7. Sensors 9 at this time register the friction moment (M _t ' _w ). This moment differs from the moment of friction in the bearings of the rolls when the mill is operating in real conditions. In

Claims (1)

Claim Method for determining friction moment • 30 in sliding bearings with removable liners during rolling in rolls, incl. The application to the supports of the forces equal to the rolling forces, rotation of the rolls and measurement of torques on Spindles 35, l and m of h and w and d w i with the fact that, in order to increase accuracy, the force is applied to the supports by means of thrust pads in the presence of the gap between the rolls _g and the desired moment is defined as the measured half.