RU2302306C1 - Method for universal profiling of rolls of sheet rolling mills - Google Patents

Abstract

FIELD: rolling processes and equipment.

SUBSTANCE: method is realized due to using relation of structure-stressed state of ferromagnetic articles and structure-responsive magnetic characteristics for correcting roll profile according to comparison results of distribution of structure-responsive magnetic characteristics in working layer of roll before guiding it to stand and after discharging it out of stand. If difference between mean values of magnetic characteristics measured in central and boundary portions along length of rolls achieves value exceeding 2.5% relative to mean value of magnetic characteristic along roll barrel, profile of rolls is corrected while providing possibility for leveling distribution of magnetic characteristics during further operation. Geometry of rolled products is improved. Early damage of rolls caused by non-uniform distribution of loads in working layer of roll barrel is achieved due to minimized difference between values of magnetic characteristics in center and along edges of roll barrel as optimal grinding profile (concavity or convexity) of rolls is selected.

EFFECT: lowered consumption coefficient of rolls.

6 dwg, 4 tbl, 1 ex

Description

The invention relates to ferrous metallurgy, in particular to the production of hot-rolled and cold-rolled sheet metal, and improves the process of selecting universal profiling (convexity or concavity) of barrels of rolling rolls. This invention can be used in preparation for the operation of work and backup rolls of single-cage and multi-cage rolling mills, as well as rollers of straightening machines, reels of coilers and other forming tools. The invention is aimed at obtaining the maximum number of rolled products of a given quality during the life of the roll.

The physical basis of the invention consists in using the known relationships between the structurally stressed state of ferromagnetic products and structurally sensitive magnetic characteristics.

A known method is the profiling of the backup rolls of the quarto system, when the profiling of the backup rolls is carried out in accordance with an equation including parameters such as the maximum wear of the work roll, the minimum and maximum width of the strip rolled during the campaign of the backup roll, the maximum possible deflection of the backup roll.

The method is aimed at increasing the resistance of the backup rolls, increasing their inter-transshipment life and improving the quality of rolled flatness.

(RF patent No. 2222393, B21B 27/02, published January 27, 2004)

This method, according to the applicants, eliminates the stress concentration due to the smoothness of the curve forming the surface of the roll in the area of the roll contact.

However, stress concentration in the marginal zone is also found on cylindrical rolls without bevels. In addition, often increased stresses are concentrated in the center of the barrel. The proposed method of profiling does not offer anticipation of increased stress concentrations in other parts of the roll barrel and does not offer a methodology for checking the achieved result

A known method of controlling the profile of rolls of a sheet rolling mill and correcting this profiling using mathematical models, characterized in that the grinding convexities or concavities of the support and work rolls are separately determined for all macroprofile sizes of the mill assortment, then the most common value of this parameter obtained for work rolls is selected as the base and use it as a single for all stands and for the entire range of grinding mill profiling, introduce it into the model with tank profiling and determine for each stand its constant value of the grinding convexities of the backup rolls, then check using the mathematical model to obtain the calculated roll profile the fulfillment for each profile size individually of the flatness of the strip in the design rolling mode.

The technical result - improving the quality of the strip in flatness.

(RF patent No. 2184004, B21B 37/32, published June 27, 2002)

However, since the input and output parameters of the model vary widely, the criterion for assessing the quality of the model is ambiguous, moreover, there is no way to assess the effect of the grinding profile of each stand of a multi-stand mill on the final result

Known backup roll sheet rolling mill with at least two conical bevels on the edges of the barrel, characterized in that the calculation of the value of the conical bevels is based on the width of the strips rolled over the campaign.

Using this method, it is possible to stabilize the transverse thickness variation and flatness of sheet metal, as well as reduce the consumption of rolls.

(RF patent No. 2043797, B21B 27/02, published September 20, 1995)

The disadvantage of this method is that it is recommended to improve the profile of the roll outside the contact zone, while a dangerous increased concentration of stresses in the working layer of the barrel of the roll occurs during inter-roll contact.

A known method of controlling the profile of the rolls of sheet rolling mills, in which form a mathematical model of machine profiling rolls in all stands of the mill.

The choice of the initial grinding profiling in this method is based on previous experience. Profiling is adjusted when the ability to control the roll profile during the rolling process becomes limited. In the calculation model of the initial machine (grinding) roll profiling, the specified ranges for using a cooler (emulsion) in the sectional cooling system of the rolls, rolling mode, thermal properties and profile size of the rolled metal are used. At the same time, the flatness characteristics of the rolled strip are improved due to the accounting and adjustment of the initial machine (grinding) profiling.

(RF patent No. 213162, B21B 37/32, published July 20, 1999)

The prototype of the claimed invention is a method for profiling rolls of sheet rolling mills, including the formation of the initial roll profile and its adjustment during operation, produced, as a rule, by measuring wear, measuring the hardness of the surface layer of the roll (see, for example, L.I. Borovik and others Technology of preparation and operation of rolls of sheet mills. M: Metallurgy, 1984, pp. 81-83, 86-87, 92-93).

This method is favorable from the point of view of affecting the flatness of the rolled products, however, from the point of view of increasing the resistance of the rolls, it is not mobile enough, since it involves adjusting the profile for actually identified defects received by the roll during its operation, and does not prevent the occurrence of defects. In addition, in the known method there is no methodology for selecting the initial moment of correction of the roll profile, as well as a criterion for assessing the accuracy of the adjustment.

The objective of the invention is to increase the resistance of the rolls by ensuring the possibility of minimizing defects in their working layer during operation, thereby reducing the expenditure coefficient of the rolls, reducing the number of rolled products with flatness that does not correspond to standard.

The technical result of the invention is to prevent premature destruction of the working layer of the roll due to uneven distribution of loads in the working layer of the roll barrel, which is achieved by controlling the distribution of magnetic characteristics in the working layer of the roll barrel and minimizing the difference between the values of the magnetic characteristic in the center and along the edges of the roll barrel by selecting the optimal grinding profiling.

The specified technical result is achieved by the fact that in the method of profiling rolls of sheet rolling mills, including the formation of the initial roll profile and its adjustment during operation, according to the invention, the profile is adjusted by comparing the distribution of structurally sensitive magnetic characteristics in the working layer of the roll before filling in and after dumping from the cage, provided that the difference between the average values of the magnetic characteristics measured in the central and regional chastkah along the length of roll barrel, quantities, exceeding 2.5% relative to the mean values of the magnetic characteristics of the roll barrel, with the possibility of ensuring the distribution of magnetic alignment characteristics during further operation.

To conduct a study of the distribution of the magnetic characteristic of the roll barrel, it is conventionally divided into ring segments 150–200 mm wide. The distance between the measurements of magnetic properties along the annular segment is also 150-200 mm. To search for the optimal profiling, three ring segments are sufficient - in the center and on the edges of the roll barrel, but a larger number of segments allows you to adjust not only the amount of grinding convexity (concavity) of the roll barrel, but also its shape, as well as solve other diagnostic tasks for which informative is the breakdown of the surface of the barrel into squares of 150 × 150 mm or 200 × 200 mm.

If the average value of the magnetic characteristic of the central and regional conditional annular segments of the roll barrel is less than 2.5% relative to the average value of the magnetic characteristic throughout the roll barrel, the stress distribution in the working layer of the roll barrel can be considered uniform, and the differences are explained by structural heterogeneity and minor roll injuries. During operation, they seek to obtain a uniform stress distribution in the working layer of the roll barrel.

As the measured characteristic, any structurally sensitive magnetic characteristic can be used, for example, coercive force, magnetic induction, the gradient of the remanent magnetization field or other structurally sensitive characteristic that allows measuring the distribution of structures and stresses in the working layer of the roll.

The essence of the method consists in profiling the rolls of sheet rolling mills in such a way that the initial grinding profiling provides a minimum difference in the average values of the magnetic characteristic between the central and edge annular segments of the roll barrel. The optimal initial grinding profile is achieved by comparing the distribution of structurally sensitive magnetic characteristics in the working layer of the roll before filling into the stand and after rolling out of the stand with subsequent profile adjustment until a uniform distribution of stresses in the working layer of the roll barrel is achieved.

The invention is illustrated in graphical representations, where in Fig.1-4 presents a typical diagram of the influence of the grinding profile on the stress distribution in the backup roll. The horizontal axis of the figure corresponds to the length of the roll barrel, along the vertical axis is a scan of the ring segment of the barrel. On the right is a scale of the values of the coercive force H _s in A / cm; other magnetic structurally sensitive characteristics, such as magnetic induction, can be measured.

Figure 5 presents the analogy of the "mechanical" and "coercimetric" loading diagrams. Figure 6 shows the layout of the roll barrels at the control point. According to measurements at these points, a magnetogram of the working layer of the roll is built. In the event that an anomaly, a spot or spots is detected in the working layer of the roll, in which the value of the measurements of the magnetic characteristic is 10% or more different from the average value of all measurements in the magnetogram, the anomaly is examined with a reduced distance between the control points. When analyzing the influence of the initial profiling on the structurally stressed state of the working layer of the roll barrel, an anomaly is excluded from the value estimate.

The magnetogram of the distribution of the coercive force of the working layer of a new backup roll, made without gross defects, is presented in figure 1. The coercive force distribution is uniform throughout the roll barrel, the average values of the coercive force, measured in the annular segments, differ statistically insignificantly.

The case of the effect of excessive grinding convexity or insufficient concavity on the distribution of coercive force in the roll, corresponding to the distribution of accumulated fatigue stresses, is presented in Fig.2. With continuous operation of the roll with profiling, which caused such a stress distribution, cracks and debris may appear in the middle of the length of the forming roll barrel. Correction of the initial grinding profile is required.

The case of the effect of insufficient grinding convexity or excessive concavity on the distribution of coercive force in the roll caused by the accumulation of fatigue stresses is shown in FIG. 3. With continuous operation of the roll with profiling, which caused such a stress distribution, cracks and debris may appear along the edges of the roll barrel. Correction of the initial grinding profile is required.

The case of the influence of the best-selected grinding bulge on the distribution of coercive force in the roll caused by the distribution of accumulated fatigue stresses is shown in FIG. 4. With continuous operation of the roll with profiling, which caused such a stress distribution, the remaining roll life increases, its consumption per ton of rolled products decreases, output decreases with a form that does not meet the requirements of regulatory documentation.

As a means of measurement, a coercimeter with a bipolar sensor and a depth of the magnetization of the working layer of the roll barrel of at least 20 mm is used.

It is possible to use another meter of magnetic characteristics with a magnetizing depth corresponding to the depth of the most loaded working layer of the roll barrel.

- коэрцитивная сила ненагруженного образца. А/см;

- коэрцитивная сила соответствующая началу текучести образца, А/см;

коэрцитивная сила, соответствующая разрушению образца, А/см.The relationship between the structurally stressed state of the working layer of the roll barrel and the coercive force is shown in FIG. 5, where F is the load applied to the tensile steel sample; l is the length of the working part of the sample, mm; ε is the elongation,%; S is the cross section of the sample, mm ² ,

- coercive force of an unloaded sample. A / cm;

- coercive force corresponding to the onset of fluidity of the sample, A / cm;

coercive force corresponding to the destruction of the sample, A / cm.

Increased values of coercive force correspond to increased values of accumulated fatigue stresses in the product.

In order not to mistakenly accept defects in the manufacture of the roll for the accumulated fatigue stresses, the roll is subjected to an input magnetic control before commissioning.

For magnetic measurements, the roll is marked on the ring segments with a width of 150-200 mm, as well as lines along the generatrix of the roll. The distance between the lines along the generatrix is also 150-200 mm. For each measurement, the sensor is installed in the center of the square formed by the marking on the ring segments and on the forming barrels, as in Fig.6. To ensure reproducibility of measurements, a series of measurements always starts from the same point, for example, it is tied to a key on the neck of the roll on the drive side.

A coercimeter with a bipolar sensor and a magnetizing depth of 20-25 mm or another meter of magnetic characteristics of the roll takes a magnetogram, in the initial state it is a digital data matrix in which the rows correspond to the measurements along the forming barrel, and the columns correspond to the measurements along the ring segments, Tables 1-4 . Based on the measurement results using special software, a graphical image of the magnetogram scan is built. Three versions of the magnetogram representation are possible:

1. In the form of a stress distribution field, where different colors and intensities of color correspond to different values of the coercive force, in accordance with the national technical tradition, the areas with the lowest values of the coercive force are colored in blue tones, and with the highest in red with a transitional green.

2. In the form of a stress distribution field, where different shades of black and white correspond to different values of the coercive force, from white for the minimum values of the coercive force to black - for the maximum, with transitional gray.

3. In the form of a histogram or polynomial of the distribution of the average values of the coercive force measurement over the annular segments.

In the process of operation of the roll at the end of the campaign, the roll is subjected to magnetic control according to the above scheme.

By the type of magnetogram, its conformity to FIGS. 2, 3 or 4 is determined and a decision is made on the need to change or maintain the original grinding profile.

If the character of the magnetogram corresponds to FIG. 2, during regrinding, the roll convex is reduced compared to the initial one. For example, if the convexity of the back-up roll in the previous campaign was + 0.60 mm, the convex +0.30 mm is laid in the next campaign, and the resurfaced roll is sent to the next campaign in the same stand from which it was dumped.

In the event that local spots (abnormal inhomogeneities) are observed on the magnetogram caused by abnormal situations - impacts, strip jamming, these spots are removed by “sticking” them with average coercive forces obtained from the annular segments on the barrel surface in the area where the anomaly is located . Using a “cleaned” magnetogram, average values of the magnetic characteristic are calculated from the conditional annular segments of the roll barrel, and the values between the central and edge segments of the barrel are compared. Correction of the profile should lead to a decrease in the difference between the average values of the coercive force of the edge and central conditional segments in the next campaign and the redistribution of zones of increased residual stresses to the form shown in figure 4.

If during the first adjustment the stress concentration did not lead to an even distribution of stresses across the roll barrel, the corrections continue.

The main numerical criterion for the effectiveness of changing the initial roll profiling is the change in the difference between the average values of the magnetic characteristics of the conditional ring segments in the center and the edges of the barrel, which reflects the stress distribution in the working layer of the roll barrel. When the initial profiling improves, the average values of the magnetic characteristics of the conditional annular segments of the roll barrel differ less than the average values of the magnetic characteristics of the conditional ring segments of the barrel of the same roll in the previous campaign.

An example implementation of the method

The support roll of a four-stand cold-rolled mill of forged steel with a barrel length of 1300 mm and a diameter of 1400 mm passed the input magnetic control before commissioning. The barrel was divided into 7 conditional ring segments with a distance between them of 200 mm (columns), the first strip - at a distance of 50 mm from the edge of the roll barrel on the drive side, from the key. Around the circumference of the barrel, 20 marking lines (rows) were applied along the generatrix of the roll with a distance between the rows of 220 mm. The sensor of the structuroscope was installed in the center of each square formed by the intersection of columns and rows. The sensor poles were located along the generatrix of the roll. The results of measurements of the coercive force before the first filling are presented in Table 1. By processing the table with special software, a magnetogram of the working layer of the measured roll was constructed, Fig. 1. When constructing a magnetogram, the smallest values obtained for the coercive force are presented in white, the largest in black, the remaining values in gray of different intensities, transitioning from white to black. The average coercive force in this magnetogram is 14.7 A / cm. The average values of the coercive force in the annular segments differ practically and statistically insignificantly. The magnetogram shows the initial uniform distribution of the coercive force in the working layer of the roll barrel. The difference between the average values of the coercive force in the central and regional annular segment is 0.2 A / cm, or 1.4% relative to the average value of the magnetic characteristic of the roll barrel.

Before putting into operation on the roll, the initial grinding bulge +0.40 mm was made, which was adopted at the mill for the first stand before the magnetic control of the rolls. After a planned seven-day campaign, the roll was thrown out of the mill, the riveted layer was removed from it and a new marking was applied to remove the magnetogram, which reproduces the marking at the input control. The results of coercive force measurements are presented in Table 2, and the magnetogram in figure 2. It can be seen that in the three central segments corresponding to the axis of rolling, the roll is overloaded and underloaded at the edges, the roll is threatened by the accumulation of fatigue stresses and premature failure along the central zone of the barrel surface. The average value of the coercive force of the roll after operation with a bulge of +0.40 mm is 16.0 A / cm, higher than that of a new roll. The difference between the average values of the coercive force in the central and regional annular segment is 2.9 A / cm, or 18% relative to the average value of the magnetic characteristic of the barrel. Obviously, the load distribution on the roll barrel must be redistributed - to reduce the convexity of the roll and thus increase the load on the edge zones of the barrel.

In preparing the same roll for the second seven-day planned campaign, it was decided to remove the bulge in order to avoid local overloads in the middle of the barrel. When regrinding the roll, the riveted layer was removed and the grinding bulge was removed, the roll was prepared for filling in the same first stand with cylindrical profiling. After the completion of the cylindrical roll campaign, the marking of the roll barrel surface and coercive force measurements were repeated, as in the case after the campaign with grinding convexity of +0.40 mm. The measurement results are presented in Table 3 and on the magnetogram of figure 3. It is seen that with a cylindrical profiling in this stand in the marginal zones, an increased concentration of stresses is observed, which can lead to premature failure of the roll — crumbs in the marginal zone. The average value of the coercive force of a roll after operation with a cylindrical profiling is 16.5 A / cm, higher than that of a new roll and a roll with a bulge. The difference between the average values of the coercive force in the central and regional annular segment is 2.4 A / cm, or 14% relative to the average value of the magnetic characteristic throughout the roll barrel. Obviously, the first profile adjustment from +0.40 mm to 0.00 mm was unsuccessful and led to the unloading of the middle of the barrel, but overload at the edges. Most likely, the optimal profiling is between +0.40 mm and 0.00 mm.

In the third planned seven-day campaign, the roll was prepared with a grinding bulge of +0.20 mm. As can be seen from Table 4 and the corresponding magnetogram, figure 4, the stress distribution for such a profile for the first stand is uniform, the roll is not threatened by premature destruction of the working layer caused by the concentration of stresses in individual zones of the roll. The average value of the coercive force of the roll after operation with a profile of +0.20 mm is 16.7 A / cm, which is slightly higher than that of a roll with a cylindrical profile. The increase in the average value of the coercive force in the third campaign corresponds to the well-known fact that some of the stresses from the previous campaign are not removed when polishing and resting the roll between campaigns. The difference between the average values of the coercive force in the central and regional annular segment is 0.17 A / cm or 1.0% relative to the average value of the magnetic characteristic over the entire roll barrel, which is less than 2.5% and corresponds to the best possible initial profiling. We can assume that after the third iteration, a universal profiling was found for the first stand of mill 1300 and the adopted set of assortment.

With this distribution of stresses, a roll with an initial profiling of +0.20 mm can work in the stand between transshipments 20-25% longer than a roll with profiling of +0.40 mm or 0.00 mm, without accumulating dangerous stresses. This reduces the plot of wear and, therefore, decreases the removal of the working layer of the roll at each resurfacing by 0.2 mm. When optimizing roll profiling, the entire filling set is considered, by iterations the best universal profiling of each pair of backup and work rolls is selected.

Table 1 Results and measurements of coercive force in the working layer of a new roll Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Row average Row 1 14.7 14.8 14.3 14.9 14.8 14.6 14.5 14.7 Row 2 14.6 14.9 14.6 14.7 14.8 14.5 14,4 14.6 Row 3 14.5 14.7 14.7 14.6 14.7 14.6 14.7 14.6 Row 4 14,4 14.6 14.9 14.5 14.8 14.7 14.7 14.7 Row 5 14.6 14.5 14.8 14.7 14.9 14.8 14.7 14.7 Row 6 14.5 14.7 14.7 14.3 14.9 14.7 14.8 14.7 Row 7 14,4 14.2 14.9 15.1 15,2 14.8 14.5 14.7 Row 8 14.5 14.7 14.6 15.0 14.9 15.0 14,4 14.7 Row 9 14.3 14.9 14.5 14.8 14.5 14.7 14,4 14.6 Row 10 14,4 14.8 14.9 14.7 14.6 14.8 14.5 14.7 Row 11 14.7 15.3 14.7 14.6 14.6 14.7 14.1 14.7 Row 12 14.9 15.1 14.8 14.6 14.3 14.8 14.5 14.7 Row 13 15.1 14.8 14.9 14.3 14.6 14.5 15.0 14.7 Row 14 14.8 14.8 15,2 14.8 14,4 14.6 14,4 14.7 Row 15 14.9 14.3 14.9 14.9 14.8 14.9 14.0 14.7 Row 16 15.0 14.2 15.1 14.8 14.9 14.7 14.3 14.7 Row 17 14.6 14.7 14.5 14.6 15.1 14.5 14.6 14.7 Row 18 14.5 14.9 14.7 14.8 15.0 14,4 14,4 14.7 Row 19 14.6 14.8 14.6 14.5 14.8 14.3 14.8 14.6 Row 20 14.8 14.9 14.2 14.9 14.2 14,4 14.7 14.6 Column Average 14.6 14.7 14.7 14.7 14.7 14.7 14.5 14.7

table 2 Coercive force measurement results after the first campaign with the initial grinding profile +0.40 mm Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Row average Row 1 15.4 16,0 17.0 17.7 16.7 15.8 14.3 16.1 Row 2 15,2 16,2 17.0 17.6 16.9 15,5 14.5 16.1 Row 3 14.9 16.1 17.1 17.6 16.6 15.3 14.5 16,0 Row 4 15.1 16,4 16.8 17.3 16.7 16,0 14.6 16.1 Row 5 14.5 15.8 16.5 16.8 16.7 15.6 14.9 18.8 Row 6 14.1 15.3 16.8 17.5 16.8 15.9 14.8 15.9 Row 7 14,4 15.6 16.5 17.3 16.5 16,0 14.7 15.9 Row 8 14.6 15.7 16.7 17.3 16.7 16.3 14.6 16,0 Row 9 14.9 15.9 16.6 17.8 16.6 15.7 14,4 16,0 Row 10 15.4 16,2 17.0 17.7 16.7 15.8 14.5 16,2 Row 11 15,2 16.3 17.0 17.6 16.9 15,5 14.1 16.1 Row 12 14.9 16.1 16.9 17.6 16.6 15.3 14.5 16,0 Row 13 14.8 16,4 16.7 17.3 16.8 16,0 14.9 16.1 Row 14 14.5 15.8 16.5 17.0 17.1 15.6 15.0 15.9 Row 15 14.1 15,5 16.6 17.4 16.1 16,2 15.0 15.8 Row 16 14,4 15.6 16.5 17.3 16.8 15.8 14.9 15.9 Row 17 14.6 15.7 16.8 17.3 16.7 16.3 14.7 16,0 Row 18 14.9 15.9 16.6 17.8 16.6 15.7 14,4 16,0 Row 19 14.6 15.7 16.8 17.3 16.3 16.3 14.6 15.9 Row 20 14.9 15.9 16.6 17.8 16.7 15.7 14,4 16,0 Column Average 14.8 15.9 16.8 17.5 16.7 15.8 14.6 16,0

Table 3 Coercive force measurements after the second campaign with an initial profile of 0.00 mm Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Row average Row 1 17.6 17,2 16,2 14.9 15.6 17,2 17,2 16.6 Row 2 17.4 17.5 15.9 15,2 15,5 17.3 17.5 16.6 Row 3 17,2 17.6 15.8 14.7 15.6 17.1 17.6 16.5 Row 4 17.1 17.6 15.7 15.0 15.0 17.4 17.6 16.5 Row 5 17.0 17.0 15,5 14.8 15.1 17,2 17.4 16.3 row 6 16.8 16.7 15.9 15.1 15.4 16.7 16.9 16,2 Row 7 16.9 17.0 15.8 14.7 15,5 16.9 17.0 16.3 Row 8 17.5 17.3 16.1 14.9 15,5 17,2 17.3 16.5 Row 9 17.6 17.1 15.8 15.1 15.4 17.1 17.1 16.5 Row 10 17.8 17.4 15.7 15.3 15.4 17.1 17.3 16.6 Row 11 17.6 17.5 15,5 14.9 15.3 17.3 17.5 16.5 Row 12 17.9 17.4 15.9 15.3 14.9 17.1 17.4 16.6 Row 13 17.7 17.5 15,5 15,2 15.0 17.3 17.5 16.5 Row 14 17.4 16.9 15.9 15.1 15,2 17.0 16.9 16.3 Row 15 17,2 16.9 16,2 15.0 15.3 16.6 16.9 16.3 Row 16 17.3 17.0 15.8 15,2 15.7 16.9 17.0 16,4 Row 17 17.8 16.8 15.8 15.4 15,5 17,2 16.8 16.5 Row 18 17.7 16.8 15.8 15.1 15.6 17.1 17.0 16,4 Row 19 17.1 17.1 16.1 15.0 15.8 17,2 17.1 16.5 Row 20 17.5 17.0 16,4 14.8 15.7 16.9 17.0 16.5 Column Average 17.4 17,2 15.9 15.0 15.4 17.1 17,2 16.5

Table 4 Coercive force measurement results after the third campaign with initial profiling of +0.20 mm Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Row average Row 1 16,2 16.9 16.8 16.6 16.5 16.7 16.7 16.7 Row 2 16.5 16.7 16.8 16.5 16,4 16.7 16.8 16.7 Row 3 16.6 16.6 16.7 16.6 16.7 16.6 16.6 16.7 Row 4 16.8 16.7 16.8 16.7 16.7 16,4 16.5 16.7 Row 5 16.7 16.8 16.9 16.8 16.7 16.6 16,4 16.7 Row 6 16.6 16.3 16.6 16.7 16.8 16.8 16.6 16.7 Row 7 16.8 17.1 16.8 16.8 16.5 16.7 16.3 16.7 Row 8 17.0 16.9 16,2 16.7 16.3 16.7 16.5 16.6 Row 9 16.8 16.7 16.3 16.9 17.1 16.6 16.5 16.7 Row 10 16.7 16.5 16.8 17.0 16.9 16.8 16,2 16.7 Row 11 16,4 16,4 16.7 16.5 16.7 16.6 16.9 16.6 Row 12 16.7 16.3 16.8 16.3 16.9 16.5 16.7 16.6 Row 13 16,2 16,4 16.7 16.5 16.8 16.9 16.6 16.6 Row 14 16.5 16.7 16.8 16.9 16.9 16.8 16,4 16.7 Row 15 16.7 16.6 16.5 16.5 16.7 16.5 16.5 16.6 Row 16 16.8 16,2 16.9 16.6 16.8 16.5 16.7 16.7 row 17 16.7 16.8 16.8 16.6 16.7 16,4 16.9 16.7 Row 18 16.8 16.9 16.3 16.5 16.8 16.5 16.8 16.7 Row 19 16.6 17.0 16,2 16.6 16.5 17.0 16.8 16.7 Row 20 16.5 16.6 16.7 16.8 16.6 16.8 16,4 16.7 Column Average 16.6 16.7 16.7 16.7 16.7 16.7 16.6 16.7

Claims (1)

A method of profiling rolls of sheet rolling mills, including the formation of the initial roll profile and its adjustment during operation, characterized in that the profile is adjusted by comparing the distribution of structurally sensitive magnetic characteristics in the working layer of the roll before filling into the crate and after rolling out of the cage, provided achieving a difference between the average values of the magnetic characteristics measured in the central and regional sections along the length of the roll barrel, a value exceeding 2.5% about relative to the average value of the magnetic characteristics of the roll barrel, with the possibility of equalizing the distribution of magnetic characteristics in the process of further operation.

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