Band planeness measuring method and apparatus

FIELD: rolled stock production.

SUBSTANCE: method comprises steps of measuring tensioning efforts successively along width of band when it passes through manufacturing line; summing measured efforts for forming function of their total effort. Total effort function along width of band is used for determining distribution function of tensioning effort for determining band planeness. Apparatus for measuring band planeness includes at least one pickup arranged along width of band, connected to computing unit. Said computing unit is made with possibility of calculating tensioning stresses along width of band according to tensioning efforts acting upon band. Said pickup is placed by inclination angle relative to band motion direction.

EFFECT: enhanced accuracy of measuring planeness.

14 cl, 12 dwg

 

The invention relates to a method of measuring the flatness of strips, particularly metal strips, when passing through a rolling mill or processing line, in which, by acting on the belt tensile forces, at least in some areas across the width of the tape determine the tensile stresses.

Metal strip at the end of the shape-forming processes under certain circumstances have a flatness defects, explained by differences in the length of the individual strips of tape across the width of the tape. Such forming processes carried out usually in the rolling mills and process lines is rolling or straightening. The flatness may also anneal.

In particular, in the processes of cold rolling is often observed certain waviness of the tapes, which occurs due to the fact that in the longitudinal direction of the tape along its thickness arise variables plastic strain. In addition to these deviations from flatness are, in addition, as deviations from shape changes straightness, such as camber,

Measuring flatness in the prior art carried out in the usual way so that the tape is exposed to tensile load, which is due to the division by the width and thickness of the tape - allow direct conclusions is the tensile strength.

The sinuosity of the tapes is a problem in the further processing, in particular, the metal strips in the automotive industry, when the variation of flatness exceeds certain limits. A measure of the deviation from flatness is the so-called unit I-Unit (IU), and one IU corresponds to the difference of tensile stresses is 10-5. This means that a separate strip of tape may have a corresponding deviation in length (Δl/l)<10-5in order to flatness, it was possible to specify a value of 1 IU.

Because manufacturers of belt material, as a rule, must confirm the above-mentioned limit values of flatness, then determine flatness defects and the respective measuring flatness is carried out in most cases in the rolling mill or processing line. The corresponding measurements can be conducted in parallel optimization of the forming process.

In the prior art exist as non-contact means of measuring the flatness (EP 1116952 A2)and such that define the tensile stresses by measuring rollers in contact with a passing tape (see the example of DE 19918699 A1).

During the non-contact means of measuring the flatness is determined in most cases by means of audio is on, ultrasonic waves, and electromagnetic means, called the latest methods use mechanical methods of measurement and are the most common in practice.

Thus, the measuring roller according to DE 19918699 A1, has many sensors located in the grooves on the distance from the wall of the measuring roller. In addition, it is also known separation of the measuring roller on the so-called Shibuya segments, as described within EP 1182424 Al.

In both cases, by means of sensors are really measuring radial forces in the area obviva tape. Thus, the resulting partial tensile force can be concluded about the local tensile stress by dividing the partial tensile forces on the width and thickness of the tape.

Depending on local defects of flatness due to differences in the length of the corresponding sensor set variables partial tensile forces corresponding variables also tensile stresses, which are a measure of the differences in tensile metal strip and thereby its flatness. It is, in principle, is known and described in detail in the article Gert Mücke, Kai F. Karhausen, Paul-Peter Pütz "Formabweichungen in Bändern: Einteilung, Eäntstehung, and und Beseitigung compounds quantitative Bewertungsmethoden", (Stahl und Eisen 122 (2002), No.2, p.33 and later).

Known mechanical is their methods of measurement associated with the fundamental drawback that receive only a limited number of measurement points across the width of the tape with the local values of tensile stress. This means that a fairly accurate resolution requires a large number of sensors, which increases the measuring roller and increases processing costs. Besides the measurements on the edge of the tape is problematic because it is possible that the corresponding sensor is only partially closed or wrapped in tape. From this we can derive the error. This is also true when you measure the position of the edge of the tape.

The basis of the invention is a technical problem to improve the method of measuring the flatness of the tape above-described kind so that you can identify low-cost distribution of tensile stresses with high resolution across the width of the tape and, in particular, to avoid defects in the area of the edges of the tape. In addition, it should be created by the device, especially suitable for implementing the above method.

To solve this problem, a generic way of measuring the flatness of the tape differs in that the tensile forces are consistently measured across the width of the tape and, if necessary, summarize, and that from thus obtained a function of the total effort across the width of the ribbon take continuous or continuous distribution function of tensile stress. is so, as a rule, the corresponding tensile forces summarize that, however, is not mandatory. If education amount does not occur, the function of total effort corresponding to the characteristic data measured tension across the width of the tape, from which derive the distribution function of tensile stress.

According to the invention, therefore, tensile stress or infinitesimal partial tensile forces on separate strips of tape from one edge of the tape measure sequentially or continuously in the direction of the other edge of the tape as the integral of the total effort. This can happen contactless as described in claim 2 of the formula. Usually, however, use in contact with the tape sensor which detects the operating tape tension forces.

When this sensor measures the tensile forces across the width of the tape, respectively, offset and determines thus, tensile forces from one edge of the tape to the other, and it is measured along a given line or surface, with values of tensile registered along the measured line or surface, summarize.

During the measurement of the flatness of the start and end points or the start and end of the zone of the sensor with respect to its cross-section is surrounded with penny is ω (coincident with the centre of the measuring roller or sensor lying within the angle obviva measuring the angle. In other words, the start and end points or the start and end of the zone measured line or sensor lie in the projection section of the measuring roller at an angle of obviva measuring video tape or metal tape.

Registered by the sensor measurement area can be divided into several areas of measurement, the individual measured tensile forces which combine the function of total effort. This occurs in most cases in available computing unit.

In addition, you can also vary according to the width of the tape average values of the respective (partial) tensile load to determine on separate strips of tape and deduce from this the distribution of tensile stress. This will be explained in more detail with reference to the description of the figures.

The object of the invention is also a device according to claim 9 for measuring the flatness of the tape, which is suitable, in particular, to implement the described method. The preferred implementation of this device set forth in PP-13.

As a result, the device is characterized by the fact that in the simplest case, a single sensor consistently measure tensile forces across the width of the tape and summarize them. This is possible because the sensor is preferably a measuring roller mounted obliquely in respect to the tion to the direction of belt movement. Due to the installation of inclined relative to the direction of movement of the belt acting on the belt tensile forces or partial tensile forces recorded at each belt with correspondingly offset, namely from one edge of the tape to the other along the measurement line.

Because the sensor is in the range of angle obviva, tensile stress, registered integrated into the measuring roller measuring beam sequentially increases in the direction of the width of the tape as the integral of the total effort. I just flat belt is more than linear increase of the tensile forces across the width of the tape. This does not have a non-planar tape.

Of course, this measured total force decreases again upon reaching the plateau or maximum (if the sensor or the measuring beam is fully covered by the tensile force), because when moving the measuring tape clip again gets out of the corner obviva. The ideal way while ascending and descending the sides are made respectively the same with different rise.

For this reason, the invention proposes to determine the distribution function of tensile stress is preferably derived from a function of the total effort across the width of the tape. Thus, it is possible to determine the disturbances which foster a function of the total effort from linearity. If this derivative function of total effort across the width of the tape divided by the width of the tape, you receive directly the distribution of tensile stresses in the ribbon, depending on the width of the tape.

The method of measurement according to the invention, is, therefore, in the ideal case only the sensor and does not have the disadvantages of the prior art, due to the finite number of sensors and the related resolution limit. The accuracy of the measurement, in contrast, significantly depends on the resolution of the sensor, which is in the simplest case, one or two Mendoza that registers acting on the measuring beam tensile forces. While the resolution can be increased due to the fact that the measuring roller as described in item 12, is equipped with several measuring beams or partial measurement beams across the width of the tape, since these partial measurement beams each cover one section of the measuring roller.

So, if, for example, three partial measurement beams the maximum force on the measuring beam is reduced to 1/3 of the total tensile forces of the tape. Thus, it is possible also to improve the measurement accuracy by a factor of 3.

Finally, the resolution can be increased also due to the fact that the measuring beam is apolnet particularly narrow and have inclined so which within corner obviva measuring video tape or metal tape is covered by only a separate part of the measuring beam. Then from those obtained changing average values derive directly the corresponding distribution function of tensile stress.

Especially narrow and small mass execution of integrated or integrated into the measuring roller (partial) measuring bars are also recommended due to the fact that it is possible to prevent measurement error or distortion, because in this respect acting on the measuring beam to the centrifugal force in forging metal tape does not play a role or play a negligible role.

In the presented method and device for measuring the flatness of the tape, characterized particularly simple construction, which ultimately explains the obtained function of total effort and derived from this the distribution function of tensile stress. This should provide the essence of the invention.

Below the invention is explained in more detail with the help illustrate only one example of the execution of drawings, on which:

figa, 1b schematically depict a device according to the invention, for measuring the flatness of the tape, a perspective view (figa) and in the de side (fig.1b);

figure 2 is a front view of the subject invention according to figure 1, reduced to constituent parts;

figure 3 - the metal strip at different points in time and to the measurement process;

4 is a diagram of the steps in figure 3, which shows the obtained tensile stress Fxwidth or the y-axis of the tape;

5 is a function F(y) the sum of the efforts of the flat and corrugated strips;

6 is a tensile force dF/dy as the derivative of the function F(y) total efforts width or the y-axis of the tape;

7 - function σx(y) the distribution of tensile stress as it arises from Fig.6;

Fig and 9 embodiments of the measuring roller according to the invention;

figa - fragment measuring roller with built-in measuring beam in vertical projection;

fig.10b - side view of a fragment on figa;

11 is a perspective view of the facility fig.10b;

Fig measuring beam with mesosome, side view.

The figures shows a device for measuring the flatness of the tape 1, in this example, the metal strips 1. In the framework of figure 1 is visible portion of the metal strip 1 when passing through the processing line, in which the tape or the metal strip 1, for example, rolled, annealed or subjected to comparable processes.

The principled design the products of the device is held, at least the width of the ribbon sensor made in this example in the form of the measuring roller 2. In fact, the length L of the sensor or the measuring roller 2 are chosen so that true:

L≥B

This is directly seen in figure 2, which shows the metal strip 1 on the front view and schematically with an appropriate measuring roller 2. Here we also see that the width of the tape is the y coordinate of the width of the tape, whereas the movement of the tape occurs in the direction X. in principle of construction is finally only marked computing unit 3, which records and processes defined by the sensor or the measuring roller 2 and the measured here tensile forces Fx. These tensile forces or partial tensile forces Fxact in accordance with the exemplary embodiment in the x direction.

The measuring roller 2 is integrated inside the measuring beam 4. This measuring beam 4 can pass through the entire length L of the measuring roller 2 uniformly spiral or straight, as shown in figa. The measuring beam 4 relies in this regard, the ends on two Mendoza 5 or comparable torque devices that record the current, mainly radially on the measuring beam 4 forces and convert them into processed calc is tion unit 3 electric signals.

Instead of the measuring beam 4 can be, in principle, there are also pins that are held in the respective through holes and perceiving in contact with tape 1 compressive force, i.e. act in the same way as described in the already mentioned publication DE 19918699 A1. When this pin can be connected directly with a torque device, which, in turn, serves the computing unit 3 electric signals. It is also possible that the pins worked on lying inside the tube as a measuring beam 4, which, in turn, issues through Mendoza 5 a signal corresponding to the tensile forces. All this is reflected in the framework of figure 2 using alternative measuring roller 2.

The measuring roller 2 is used to record the flatness of the tape or metal tape 1. This invention relies on the fact that when the loading of the metal tape 1 in X direction of the tensile force, which is so great that all infinitesimal strip of tape stretched due to undulation differences Δ1 in the length of the individual strips of the tape correspond to the difference in tension (in the direction x of movement of the tape)

From this expression arise differences in tensile strain (X-direction)

where E is the modulus of elasticity of the material of the tape, Fx- the tensile stress in the X-direction, V - belt width and s is the thickness of the tape.

From the last relation it follows that changes tensile stresses Δσxcan be obtained by measuring the tensile forces Fx(if the tensile stress Fxto share more on the width and the thickness s of the tape). These changes of this effort Fxdetermined using the measuring roller 2. When this is measured in the x-direction movement of the tape is not directly corresponding tensile force Fxbut, on the contrary, its radial component F'xthat follows from obviva measuring roller 2 tape 1 (fig.1b).

Figure 2 and 3 shows that the sensor or the measuring roller 2 is located relative to the direction x of movement of the tape sloping. Thus, compared to the prior art, for example, by DE 19918699 A1 acting on the tape 1 tensile forces Fxyou can define the width or the y-axis belt not only land, but also continuously.

For this purpose, the measuring roller 2 registers tensile forces Fxwith an appropriate time delay, as shown in figure 3. This time delay is illustrated using three different moments t1, t2, t3time, which correspond to different angles regards the PTA measuring roller 2 when applying to passing the ribbon 1.

At time t1the starting point or the starting area And of the sensor of the measuring roller 2 or the measuring beam 4 has reached the edge 6 tape 1 within the so-called length To contact. This length of contact determines the size of the 7 contact size· (3)corresponding to the area within which there is contact between the measuring beam 4 and the tape 1. The length of the contact corresponds to the angle α obviva (fig.1b).

As soon as the starting point or the starting area And the measuring beam 4 has reached the edge 6 of the tape, Mendoza 5 register signal on the basis of the current on the measuring beam 4 of the radial component F'xtensile forces Fx. If the tape 1 continues to move in the x-direction movement, and the measuring roller 2 part numbers on the tape 1, the measuring beam 4 at its inclined consistently moves over the entire area of contact or the measured area of 7.

This occurs at time t2. Since this movement of the measuring beam 4 is more and more immersed in the contact area or measuring area 7 increases and the measured mesosome 7 tensile stress Fx. This continues up until the end point or destination area E of the measuring beam 4 or the measuring roller 2 will not leave the area 7 of the contact that occurs after Sanitaria figure 3. The measured tensile force Fxafter ascending primarily reaches the level like a plateau when the measuring beam 4 is located entirely within the contact area or the measured area of 7, and then again drops to zero when the measuring beam 4 out of space 7 of the contact. This characteristic is schematically shown in figure 4.

Now, the point is that I just flat belt 1 tensile stress Fxincreases linearly, because there are differences in expansion do not occur, i.e. the ratio Δl/l takes the value of zero. For this reason it occurs also differences ΔFxin the tensile force Fx. On the contrary, wavy ribbon leads to fluctuations in the tensile forces Fxas is also shown in figure 4 for non-planar tape.

This difference is noticeable also when considering figure 5, which compares the flat tape (dots) with wavy ribbon (squares), namely using a coordinate representation of the function F total effort obtained from a separate tension Fxdepending on the width of the tape or the coordinates of the width of the tape.

If you display this function F(y) total efforts to coordinate the width of the tape, i.e. to form a differential coefficient dF/dy, we get the distribution of tensile stress relative to the coordinates of the width l of the options, as shown in Fig.6. Also in this case, the curve with dots refers to the flat ribbon, while the wavy ribbon is characterized by squares. Dividing this differential coefficient dF/dy on the thickness s of the tape is obtained directly function σx(y) the distribution of tensile stress with respect to the width of the tape or the coordinates of the width of the tape 7. 6 and 7 show this fragment of figure 4, corresponding to increasing the side to the level of the plateau. Needless to say, alternatively or additionally it is possible to evaluate also drop down the side.

From Fig can be seen that the measuring roller 2 may be in the longitudinal direction of several partial measurement beams 4A, 4b, 4C within a single option. Thus, the measuring roller 2 is divided into several, mostly three, longitudinal measurement zone. Due to this, may be increased resolving power, since the tensile stress Fxthe maximum current for the corresponding partial measurement beams 4A, 4b, 4c, corresponds to only one third of the total tensile forces of the tape and, therefore, the measurement accuracy can be increased accordingly.

On fig.1b shows the additional option of equipping the measuring roller 2 around the circumference of the multiple partial measure is ranked on the bars 4. Depicted, in General, three distributed around the circumference of the partial measurement beams 4A, 4b, 4C, which interact with corresponding mesosome 5. Thus, for each revolution of the measuring roller 2 can be performed several measurements of flatness.

Finally, from figure 9 it is seen that the measuring beam 4 can be made so narrow and is so inclined that during measurement, the measuring beam 4 to its starting or initial area a and its end or end area E is not more fully within angle α obviva or not absorbed more fully into it, as it is pursued in the framework of the above steps. On the contrary, the length To contact and thereby the contact area or measuring area 7 receives an amount which with the passage of the tape 1 load measuring beam 4 is only partially and not fully.

Consequently depicted in figures 9 and was responsible for measuring tensile forces Fxsize 8 touch remains largely constant and experiences deviation only at the beginning and the end. This implies that the corresponding value of tensile forces Fxthat corresponds to the measured moving average value of the width or the y coordinate of the tape.

Fluctuations of the tensile forces Fxthis method can be converted is the substance directly into the corresponding tensile stress or arising from this function σ x(y) the distribution of tensile stress, because fluctuations ΔFxtensile forces when the accepted change dA square 8 touch lead directly to changes Δσx(y) tensile stress. This implies the desired function σx(y) the distribution of tensile stresses across the width, the y coordinate of the tape. Thus, measuring flatness and measuring flatness, described at the end are the result of the emergence of the tape 1 corresponding function σx(y) the distribution of tensile stress, schematic view of which is shown in figure 1.

It is clear that the measuring roller 2 is provided, in General, shell, for example, tungsten carbide or hard chrome layer. He may have a cylindrical shape, which, however, is optional. It is also possible to equip the measuring roller 2 podwodami, which serves the cooling means, so as to more accurately measure the flatness and to eliminate the influence of temperature. Also supplied coolant ensures that the used Mendoza 5 will not be damaged by the action of temperature. This applies, in particular, to the case of the described method should be applied in the rolling mill.

Further, it is clear that under option, according to figure 2, with pins instead of the change is sustained fashion beams 4 sealed the inevitable gaps between the pin or the sensor and the measuring roller 2. This may be by means of o-rings, plastic inserts, and similar measures for sealing. Thus, it reliably prevents the penetration of dirt. Finally, and this includes the idea of the invention, to equip the measuring roller 2 by one or more temperature sensors. Thus, it is possible not only to determine the temperature of a moving tape or metal tape 1, but after that create the temperature profile. This temperature measurement gives information about possible needs in the cooling means for the measuring roller 2 so as to maintain the temperature within acceptable limits, or to minimize the influence of temperature during the measurement.

How, in particular, can be seen from figure 10, 11, the measuring beam 4 passes in a vertical projection at a given angle β tilt to the main axis 9 of the measuring roller 2. Due to this, the measuring beam 4 forms almost ellipsometry arc on the surface of the measuring roller 2.

In conclusion it should be emphasized that by using the described method can be defined, of course, not only the tensile stress Fxand function σx(y) the distribution of tensile stress in the longitudinal direction of the tape or in the direction of the axis X. similarly, alternatively or additionally it is possible is to create and define, for example, the tensile forces in the direction of the y axis.

1. The method of measuring the flatness of strips, particularly metal strips (1), when passing through a rolling mill or processing line, including the measurement of current tape tension, at least in some areas across the width of the tape determine tensile stresses, characterized in that the tensile forces measured consistently across the width of the tape and summarize them to produce a function of the total effort obtained from a function of the total effort across the width of the tape to define the distribution function of tensile stress to determine the flatness of the tape.

2. The method according to claim 1, characterized in that the distribution function of tensile stress determined from the derivative of the function of total effort across the width of the tape.

3. The method according to claim 1 or 2, characterized in that the operating tape tension forces are determined without contact.

4. The method according to claim 1 or 2, characterized in that the operating tape tension forces are measured by at least one in contact with the ribbon sensor.

5. The method according to one of claims 1 to 4, characterized in that the measurement of tension across the width of the tape is performed by the sensor with a time delay to determine the tensile load from one edge of the tape is up to the other edge along a given line measurement of tensile forces within the area of measurement, within the time of measurement is the contact of the sensor with tape, and summarize them.

6. The method according to one of claims 1 to 5, characterized in that the measuring sensor is carried out from a starting point located on one of the edges of the tape to the end point located on the other edge of the tape, the sensor is located relative to the band with obviva band and performed with the measuring angle within the angle obviva.

7. The method according to one of claims 1 to 6, characterized in that for measuring tension to use the probe with multiple measuring zones, with separate measured tensile forces in each zone are combined into a function of total effort.

8. Device for measuring the flatness of strips, particularly metal strips, when passing through the production line, containing at least one passing at least across the width of the ribbon sensor connected to the computing unit, configured to calculate the current tape tension tensile stresses across the width of the tape, characterized in that for measuring the tension sensor is located relative to the direction of movement of the tape obliquely.

9. The device according to claim 8, characterized in that the sensor is made in the form, at least partially PBE is by the measuring tape roller with integrated measuring beam.

10. The device according to claim 8 or 9, characterized in that the measuring beam relative to the cross-section of the measuring roller during measurement is its initial area and the target area at least partially within the angle obviva.

11. Device according to one of PP-10, characterized in that the measuring roller contains in the longitudinal direction of the multiple measurement beams, which divides the measuring roller at different longitudinal zones of measurement.

12. Device according to one of PP-11, characterized in that the measuring roller has a circumference of several measuring rods for implementation for one revolution of the roller several measuring flatness.

13. Device according to one of p-12, characterized in that the measuring beam in the vertical projection is inclined at a given angle to the main axis of the measuring roller.

14. Device according to one of PP-13, characterized in that the measuring roller is made of individual segments that are installed when needed inclined.



 

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12 cl, 5 dwg

FIELD: rolled stock production.

SUBSTANCE: method comprises steps of measuring tensioning efforts successively along width of band when it passes through manufacturing line; summing measured efforts for forming function of their total effort. Total effort function along width of band is used for determining distribution function of tensioning effort for determining band planeness. Apparatus for measuring band planeness includes at least one pickup arranged along width of band, connected to computing unit. Said computing unit is made with possibility of calculating tensioning stresses along width of band according to tensioning efforts acting upon band. Said pickup is placed by inclination angle relative to band motion direction.

EFFECT: enhanced accuracy of measuring planeness.

14 cl, 12 dwg

FIELD: tools for measuring non-planeness of strip material at working it, for example at rolling metallic strip.

SUBSTANCE: piezoelectric pickups are placed in lengthwise recesses of solid roller for measuring stress distribution along width of strip. Said piezoelectric pickups are arranged in roller recesses in such a way that they are spaced from its lateral surface and fastened into them.

EFFECT: enhanced reliability of measurements.

14 cl, 12 dwg

FIELD: metallurgy.

SUBSTANCE: method comprises measuring the angles of inclination of the members of the surface of the sheet in each of the belt longitudinal sections of the strip selected by the measuring device. The angle defined by the lines of intersection of the plane tangent to the surface of the sheet at the point of measurements and plane tangent to the bearing members are measured. The flatness of the sheet is determined from the formula proposed.

EFFECT: enhanced precision.

FIELD: process engineering.

SUBSTANCE: proposed measuring roll comprises, at least, one measuring bar resting on transducers built in roll outer surface. Note here that measuring bar is composed of strip tension measuring bar for determination of strip tension temporal process and extends, in fact, along circular contour in one preset zone of roll circular contour. In compliance with another version, said bar extends inclined to roll axis and extends on one side along one preset width zone and, on opposite side, along one preset zone of roll circular contour. Flatness measuring bar comprises, at least, one strip tension measuring bear as reference measuring bar. Note here that flatness measuring bar is used for measuring one voltage signal depending upon time and describing width coordinate. Note also that reference measuring bar is used to measure one reference time-dependent signal irrespective of width coordinate and describing strip temporal process. Note that reference signal is filtered from tension voltage signal for determination of strip intrinsic tension process.

EFFECT: higher accuracy of measurement.

7 cl, 6 dwg

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