SU845758A3 - Device for automatic control of metallic web shape - Google Patents

Description

control the shape of the rolled metal so) "e is limited. As a result, a sheet of the desired shape cannot be obtained which reduces the accuracy of the shape and the quality of the rolled strip.

The aim of the invention is to improve the shape accuracy of rolled strips and improve their quality.

In order to achieve the intended purpose, a device for automatic adjustment of the forml of a metal strip, comprising electric motors of the upper and lower work rolls, respectively, an electric motor control system and a strip shape sensor, further comprises an arithmetic unit, a gap adjustment unit between the rollers and two gap setting units between rollers, the input of the arithmetic unit is connected to the output of the strip shape sensor, the first and second outputs of the arithmetic unit are connected respectively to the first and torym inputs of the motors of the control system, the third output of the arithmetic unit connected to the control input of the gap between the rollers, whose output is connected to the inputs of the first and second blocks gap setting between the rolls.

FIG. 1 shows a functional diagram of the proposed device; . 2-4 — relationships between the ratio of the peripheral speeds of the upper and lower work rolls and the frictional force; in fig. 5 is a graph of the relationship between roll diving and the thickness of rolled metal.

The device contains the upper 1 and lower 2 VSKs, which are connected via a reduction gear 3 to the output High motors 4 and 5 so that the rolls 1 and 2 can rotate at different peripheral speeds V and Y, respectively. The rolls 1 and 2 can be directly connected to the output rolls of the electric motors 4 and 5.

The device also contains a strip shape sensor 6, an arithmetic unit 7, an electric motor control system 8, two blocks for installing a spare energy between the rollers and a block for adjusting the gap between the rolls.

The device works as follows.

A sheet of metal having a thickness h is rolled using upper and lower rolls 1 and 2 to a sheet of thickness Ll A rolled sheet of thickness hj is constantly monitored by a form sensor 6 associated with an arithmetic unit 7, the first and second outputs of which are connected respectively to the first and the second input of the engine control system 8, and the third output of the arithmetic unit 7 is connected to the input

block 11 adjustment of the gap between the rollers.

In response to the signal from sensor 6, which continuously measures the shape of rolled products with a thickness h, the arithmetic unit 7 calculates the increment or reduction of the pressure P for rolls required to correct the shape of the rolled sheet, and the peripheral speeds V and VQ for the upper and lower rolls 1 and 2 required for obtaining the above mentioned adjustments or decreasing the size of P. in response to the signal of the arithmetic unit 7, the motor control system 8 regulates the speed of rotation of the shafts of the motors 4 and 5, and hence the circumferential STI upper and lower rolls 1 and 2.

The gap adjusting block 11 between the rollers is connected to two blocks 9 and 10 of setting the gap between the rollers so that, in response to the shape correction signal from the arithmetic unit 7, block 11 causes blocks 9, 10 to work so that the lower roll 2 can be positioned from the upper roll 1 at the desired distance.

The arithmetic unit 7 calculates the increment or reduction of the gap between the rolls D S in the manner described above, and in response to a signal characterizing the mentioned increment or decrease and S from the arithmetic block 7, the block 11 causes the blocks 9, 10 to set the gap between the rolls to work so that the gap between the rolls 1 and 2 can be increased or decreased by the value of S.

In a rolled mill of the type described, the ratio between the peripheral speeds of the upper and lower rolls 1 and 2 varies so that the pressure on the rolls can change and, therefore, the deformation of rolls 1 and 2 can be adjusted and the shape of the rolled metal can be adjusted.

FIG. 2, 3 and 4 it is shown that the upper and lower work rolls 1 and 2 have the same diameter and thickness of the metal sheet before and after rolling. Neutral lines or dots

0 denoted by N, and N,.

FIG. 2 shows known rolling conditions, in accordance with which the upper and lower work rolls 1 and 2 rotate with the same

Claims (3)

5 circumferential speeds, the neutral points N, |, Nj are on the same vertical line, and in zones A and B they are subjected to the action of frictional forces, the direction of which is indicated by arrows. As a result, the metal sheet is subjected to a horizontal compressive force in such a way that the vertical compressive force or pressure on the rolls is greater than in the case where the sheet is not subject to the action of friction forces. FIG. Figure 4 shows the rolling draw method, where the circumferential speeds and V, the upper and lower rolls 1 and 2 are chosen to satisfy the following condition where h. and hj is the thickness of the metal before and during the rolling of rolls. Consequently, in the zone C of sheet capture by rolls, the frictional force acting on the metal along the contact arc between the sheet and the upper roller 1 is opposite to the direction of the action of the friction force on the sheet along the contact arc between the sheet and the lower roller 2. The upper point is at the exit point the upper contact arc, while the lower neutral to the point N. is located at the entry point of the lower contact arc. As a result, the sheet is not subjected to horizontal compressing, and the pressure on the rolls does not depend on the strength of friction and is less than the pressure on the rolls described with reference to FIG. 2. In FIG. The 3 circumferential speeds of the upper and lower rolls 1 and 2 are adjusted so that the upper and lower neutral points N and N3 are offset from the exit point of the upper contact arc and the entry point of the lower contact arc and are not located on the one vertical line. As a result, on both sides of the sheet gripping zone C, the sheet is subjected to friction under the same conditions as in the case of known rolling. Therefore, the pressure on the rollers will be intermediate between the pressures described with reference to FIG. 2 and 4. It is evident from this that the pressure on the beams can vary by changing the ratio between the circumferential speeds of the upper and lower work rolls 1 and 2. When the pressure on the rolls changes, while the thickness before rolling and the thickness after rolling being kept constant, the deformation of the roll is changed in such a way that the profile of the rolled metal will change. As the cross-section of rolled metal varies, the spread of metal extensions across the width also changes, so the shape of the rolled metal will also change. Thus, the shape of the catai metal can be adjusted by varying the ratio by circumferential velocities of the upper lower shaft 1 and 2.. It was experimentally found that when rolling soft steel using the drawing process (Fig. 4), the pressure on the rolls is reduced to, for example, approximately 1/3 of the pressure exerted by the known rolling method (Fig. 2). As a result, the thickness of the middle part of the sheet also decreases by approximately 1 / 3. Thus, the possibility of correcting the formulas of the sheet, and hence the shape of the rolled sheet, can be significantly improved compared with the known methods and rolling mills for their implementation, which will increase the accuracy of the rolled form, and consequently, its quality. The invention of the Usa; device for automatic control of the metal strip formulas containing electric motors of the upper and lower barrel rolls, respectively; an electric motor control system and a strip shape sensor, characterized in that, in order to improve the shape of the rolled strips and improve their quality, it additionally contains an arithmetic unit, a block for adjusting the gap between the rollers, two blocks for setting the gap between the rollers, and the input is arithmetic. The first block is connected to the sensor output of the strip formula, the first and second outputs of the arithmetic unit are connected to the first and second motors control systems, the third output of the arithmetic unit is connected to the input of the gap control unit between the terminals, the output of which is connected to the gap. between vbshkami. Sources of information taken into account in the examination (e 1. Copyright certificate CCCI No. 498993, class B 21 V 37/02, 1976.