SU787126A1 - Roll assembly of sheet multiroll rolling mill - Google Patents

Description

one

The invention relates to the processing of metals by pressure, in particular to the rolling of metal strips on multi-roll mills.

Roller assemblies of sheet rolling stands are known in which the work rolls are supported on two rows of intermediate rolls, which, in turn, transfer the rolling force to the support rollers 11.

However, the analysis of the distribution of efforts over the contacts of the roll pyramid showed that the loads on the extreme support rollers are significantly higher (by 11-67%) than the average, which leads to more intensive wear of the bearings of the extreme support rollers.

The closest to the proposed invention to the technical essence is a roll node of a multi-roll sheet mill containing work rolls, intermediate rolls, extreme support rollers with a convex profile of the generatrix 2.

The disadvantage of the device is that the correction of the profile of the tape is ensured by adjusting the amount of convexity forming the extreme supports (of the rollers, which aggravates the

The conditions of operation of medium bearings are extreme bearing rollers and leads to more intensive wear. In addition to the TOGO, the known device does not provide for the possibility of compensating for the undesirable, from the point of er-rotting, durability of the bearings of the extreme support rollers, due to the profiling of intermediate rollers or medium supporting rollers, there is no information about the mutual correspondence of their profiles.

The purpose of the invention is to increase the lifetime of the bearings on the extreme support rollers.

The goal is achieved by the fact that the extreme support rollers are made with a concave profile of the generator, the magnitude of the concavity of the profile

Yes, extreme support rollers are related to the magnitude of convexity of medium support rollers by dependence

,

25

-the magnitude of the concavity of the extreme

-de L support rollers;

-the magnitude of the concavity of the media from them support rollers

Claims (1)

30 K is a coefficient that varies depending on the ratio of the geometric parameters of the roller assembly. FIG. 1 shows the roller assembly; in fig. 2 is a diagram of the extreme support roller and the profile of its generator. The proposed dependence is obtained as follows. at 2ccc at congruence Ug ° r a is the total deflection of the worker where VI roll; L Us-deflections in the contact areas of the roll pyramid (see Fig. 1); ypj, .c co & cos5b y + oos5 (To compensate for the influence of the profiles of the support rollers on the profile of the active generator of the work roll, and consequently, on the transverse thickness of the rolled products, it is necessary to ensure that the total deflection of the work roll is equal to zero In. By means of the transformations of equation (3), the coefficient of proportionality K is obtained, which relates the values of the profiles of the extreme and average support rollers, determined by the formula - COSfb-CORX. COS (b-CO, 0-OOSe.tCOSX-C05rij depending on ratios of geometrical parameters of rolls The node varies in the range of 1.1-2.1, The device operates as follows. During the strip rolling process, the force of the metal on the rolls is distributed along the lines connecting the centers of the worker 1, the first 2 and second 3 intermediate rolls and transferred to the middle 4 and extreme 5 support rollers (see Fig. 1. The non-uniformity of the multi-roll pressure (the effective force in the contact between the rollers and the support rollers) causes their corresponding elastic deformation. The ply of the multi-roll pressure (linear force) at the contact of the extreme support roller with the intermediate roller (see Fig. 1g) has a convex parabolic shape, as a result of which the middle bearings (see Fig. 2 W, Vjj experience higher loads and, as a result, this, wear faster. Used in a known device, the convex profiling of the extreme support rollers additionally increases the unevenness of the interstage pressure and aggravates the wear of the middle bearings. The profiling of the extreme support rollers is concave (see Fig. 2) Using the calculation method, roll pressure and elastic deformations determine the deflections of the rolls and support rollers.The total deflection of the work roll of a 20-roll mill, which depends on the width of the rolled strip, the rolling force and the geometrical parameters of the roller assembly (ratios of rolls diameters and support rollers, angles roll pyramid) is defined by the expression cos x (y coa | / coa9, °), the angles of the roll pyramid (see fig, 1). Expression (2) with regard to the support roller profiles (concave for extreme - Dz and convex for medium i ij) takes the form 3) unevenness of the roll-over pressure plot and contributes to a more uniform distribution of forces between the bearings, which increases their durability. To compensate for the associated increase in the deflection of the active generatrix of the work roll, which affects the transverse thickness variation of the rolled strip, additional convexity should be added to the middle support rollers. Thus, the proposed device allows to increase the service life of the bearings of the extreme support role, cov. Claim Invention Roller assembly of multi-roll sheet mill containing work rolls, intermediate rolls, extreme support rollers and medium support rollers with convex generatrix, characterized in that, in order to increase the service life of bearings on the extreme support rollers, the extreme support rollers are made with a concave profile generatrix, the magnitude of the concavity of the profile of the extreme supporting rollers is associated with the magnitude of the convexity of the middle supporting rollers by the following dependence DK UC / KJ where DK is the magnitude of the concavity of the extreme support rollers; D with - the value of the convexity of the average support rollers; K is a coefficient varying with the ratio of the geometric parameters of the roller assembly. Sources of information taken into account in the examination 1. Korolev A, A, Mechanical equipment of rolling mills, 1965, p. 16. 2, US Patent No. 3528274, cl. 12-242, 1970.