SU1184576A1 - Arrangement for regulating the tension of the strip width in rolling - Google Patents

Description

The invention relates to the field of rolling production and can be used to increase the flatness of thin

strips produced on continuous and reverse cold rolling mills.

The purpose of the invention is to improve the flatness of the car by increasing the limits of regulation of tension in width.

FIG. 1 shows a diagram of the device; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a view B in FIG. one; in fig. 4 is a device installation diagram in a continuous mill; in fig. 5 - roller profile in the regulation of symmetric defects in the form of rolled; in fig. 6, 7 - the same, when adjusting asymmetrical defects in the form of rolled products.

The device scheme includes roller sections 1-7 mounted eccentrically on a cylindrical shaft 8 mounted in bearing supports 9 and 10 using eccentric supporting sleeves 11. The sleeves 11 are fixed to rotate on the shaft 8, and the sections are mounted on bearings 12. The shaft 8 is driven rotation around its axis, made in the form of a gear 13 mounted on its cantilever section, and a rack 14, the translational movement of which is provided by a hydraulic cylinder 15. The plane of maximum eccentricity of the roller section 1 corresponds etstvuet plane 0-I. The plane of maximum eccentricity of the roller section 2 corresponds to the plane 0 — II, etc. The angle of installation of the eccentricity of each subsequent section relative to the previous one is the value

where n is the number of sections;

2l - the angle of rotation of the shaft around the axis.

In the line of the continuous mill, the device 16 for adjusting the tension across the width of the strip is installed in the immediate vicinity of the deformation zone of the metal of the last working stand 17. The control of the distribution of the tension across the width of the strip is carried out using a sectional roller of the stressometer 18.

The device works as follows.

After filling the strip to the mill, the roller stress meter 18 controls the distribution of longitudinal tensions over its width in its lower position. If the distribution of tension corresponds to the specified, then the strip rolling without contact with the sectional roller device 16. In the case of strip rolling with tension distribution across the strip width different from that specified by the condition of flat steel production, roller stressometer 18 forms a control pulse, under the action of which the working fluid is supplied to the hydraulic cylinder 15.

The rod of the latter moves the toothed rack 14 in a vertical direction, which with the help of gear 13 rotates the shaft 8 around its axis until the profile of the sectional roller formed by the surfaces of the roller sections 1-7 facing the strip corresponds to the correction of the fixed defect. At the same time, the roller stressometer 18 deflects the strip upwards, which comes into contact with the sectional roller of the device 16.

For example, if the tension of the middle section of the transverse profile of the strip exceeds the tension of its edges, which corresponds to a defect of the “wave along the edges” strip, the shaft turning mechanism 8 orients the sectional roller so that the vertical plane perpendicular to the rolling axis coincides with the plane of the roller 0 — IV. The profile of the roller (see Fig. 5, curve "a") formed by the surfaces of sections 1-7 facing the strip causes additional tension in the middle sections of the strip, which contributes to an increase in their stretching, a decrease in the difference in longitudinal tensions along its width and an improvement in the form of rolled products. .

When rolling a strip with a symmetrical box-like defect in the middle, the shaft 8 of the sectional roller is oriented so that the vertical plane perpendicular to the axis of rolling coincides with the plane of the roller 0 — I. In this case, the profile of the roller facing the strip corresponds to the curve “b” (Fig. 5).

To correct asymmetric strip shape defects, for example, “left box”, “right box”, the sectional roller is introduced into a position in which the vertical plane, perpendicular to the rolling axis, coincides with the 0 — V plane (Fig. 5, curve “c”) and 0 — III (Fig. 6, curve “d”). To correct defects like “wave along the left edge”, “wave along the right edge”, the roller takes a position in which the vertical plane, perpendicular to the rolling axis, coincides respectively with planes 0 — IV (curve d), Fig. 7, and planes 0 — II (Fig. 7, curve “and”).

Fine regulation of the distribution of the strip tension is carried out in the intermediate positions of the sectional roller, which significantly expands the technological possibilities of correcting asymmetric flatness defects of the strips. Moreover, these opportunities are the wider, the greater the number of sections mounted on the shaft 8 of the roller.

The degree of concentration of tensions in certain sections of the transverse profile of the strip depends on the force of its clamping to the sectional roller, which is determined by the height of the “H” roller-stressometer 18 and the eccentricity “e” of the roller sections 1-7 on the shaft 8, which are chosen in each particular

1 184576

case for rolling conditions on this

camp.

For example, for a four-stand cold rolling mill 1700, the number of roller sections, which expands the technological capabilities for controlling the flatness of all sizes of rolls rolled on the mill, is 11, and the eccentricity value is sufficient to effectively impact the sectional roller on the strip when the roller-stressometer is lifted to a maximum height of 5 = 250 mm

equal to 0.95 mm.

The limits of tension regulation across the width of the strip increase by at least ⁵ % by 20%, and the expansion of the technological possibilities of regulation determines the correction of asymmetrical defects in the shape of the rolled stock and an increase in output

up 0.2%.

A view B

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Claims (1)

A DEVICE FOR REGULATING TENSION BY BAND WIDTH WHILE ROLLING, including a roller in the form of sections mounted on an eccentric shaft, a shaft rotation drive, characterized in that, in order to increase the flatness of the rolled stock by increasing the limits of tension adjustment in width, the shaft is designed as a series of eccentrics the number of roller sections, with the eccentricities of each pair of adjacent eccentrics being rotated relative to each other by an angle where n is the number of sections. five Ws l, 1184576 77. FIG. one 75 ' 1184576