EP2983863B1 - Assembly and method for grinding a metal strip - Google Patents

Description

The invention relates to an arrangement for grinding a metal strip, comprising a grinding device, a pressure device acting on the grinding device with at least one Andruckmotor for moving / pressing the grinder against said metal strip, a measuring device for measuring the thickness / surface of the metal strip, which in the direction of movement the metal strip / grinding device is arranged in front of the grinding device, and a drive for moving the metal strip relative to the grinding device and / or vice versa. Furthermore, the invention relates to a method for grinding a metal strip, in which a thickness / surface of the metal strip is measured prior to grinding, a grinding device is moved / pressed against the said metal strip and / or vice versa and in which the metal strip in the longitudinal direction relative to Grinding device is moved and / or vice versa.

An arrangement and a method of the type mentioned are known in principle. For example, the AT 505 640 A1 to a method in which the metal strip is ground by a grinder and then its thickness is measured by means of a measuring device. If the result obtained is not satisfactory, the metal strip is ground again and then measured again in terms of its thickness. This process is repeated until the metal strip has the desired thickness. For example, such a processing operation in the production of (high-gloss polished) endless belts made of stainless steel.

A disadvantage of this arrangement, or in this method is that the grinding device in the known method in places where no removal must take place, under certain circumstances lifted off the metal strip and grinding a dent during reassembly. This naturally precludes the desired homogenization of the thickness of the metal strip.

An object of the invention is therefore to provide an improved arrangement and an improved method for grinding a metal strip. In particular, the metal band After grinding, it should be free of any unevenness, and the grinding process should be faster.

• eine mit der Messeinrichtung und dem zumindest einen Andruckmotor verbundene Steuerung/Regelung vorgesehen ist, welche dazu eingerichtet ist, das Bewegen/Andrücken der Schleifeinrichtung anhand der ermittelten Dicke/Oberfläche durchzuführen, den Andruck der Schleifeinrichtung gegen das Metallband jedoch auch dann nicht unter einen Mindestwert zu senken, wann ein Schleifen aufgrund der ermittelten Dicke/Oberfläche (und im Hinblick auf einen gewählten Soll-Abtrag) an sich nicht nötig wäre.

The object of the invention is achieved by an arrangement of the type mentioned, in the

• provided with the measuring device and the at least one Andruckmotor control / regulation is provided which is adapted to perform the moving / pressing of the grinding device on the basis of the determined thickness / surface, but then the pressure of the grinding device against the metal strip below a minimum value Lowering when a grinding due to the determined thickness / surface (and in view of a selected target removal) per se would not be necessary.

• das Bewegen/Andrücken der Schleifeinrichtung anhand der ermittelten Dicke/Oberfläche durchgeführt wird, wobei der Andruck der Schleifeinrichtung gegen das Metallband jedoch auch dann nicht unter einen Mindestwert gesenkt wird, wann ein Schleifen aufgrund der ermittelten Dicke/Oberfläche (und im Hinblick auf einen gewählten Soll-Abtrag) an sich nicht nötig wäre.

The object of the invention is further achieved by a method of the type mentioned, in which

• However, the pressing of the grinder against the metal strip is not lowered below a minimum value even when grinding due to the determined thickness / surface (and with respect to a selected target Order) would not be necessary per se.

As a result, the metal strip has a substantially uniform height / roughness profile after the grinding process, or the grinding process can also be carried out in a shorter time, since due to the proposed measures usually less grinding passes are a satisfactory result than in conventional methods. When grinding the metal strip of Andruckmotor is controlled by the control / regulation based on the determined actual height / roughness profile. Specifically, the contact pressure is increased at those points of the metal strip, which have a high height, or roughness. Accordingly, the contact pressure is reduced at those points of the metal strip, which are relatively low in relation to a desired plane, or have a low roughness. However, the pressure of the grinding device against the metal strip is not lowered below a predefinable (positive) minimum value during the grinding process. This means that the grinding device is pressed against the metal strip even when a grinding would not be necessary per se due to the determined thickness / surface per se. With In other words, this means that the metal strip is also ground at the already deep in itself. At first glance, this seems contradictory, since it is precisely the object of the invention to homogenize the thickness of the metal strip. Although the chosen procedure leads to the fact that the existing valleys are ground even deeper, but avoids the formation of dents, which normally arise when lifting the grinder from the metal strip and reasserting on the same. In addition, the surface in the valleys is leveled, whereby the grinding process is facilitated in a subsequent grinding pass. Recent investigations have shown that the even deeper grinding out of already existing valleys has less negative effects on the grinding result than the mentioned formation of dents, or even a positive effect occurs due to the mentioned leveling. As a result, the metal strip with improved quality can be ground in fewer passes and thus more quickly to uniform thickness.

Further advantageous embodiments and modifications of the invention will become apparent from the dependent claims and from the description in conjunction with the figures.

It is favorable if the measuring device comprises at least one ultrasonic sensor. In this way, the thickness / surface of the metal strip can be measured quickly and accurately.

It is advantageous if the pressure device comprises at least one group, each with two pressure motors coupled in series and different in terms of their drive type. As a result, different requirements for the pressure device can be well met. For example, a first Andruckmotor for the coarse adjustment, a second Andruckmotor be provided against the fine adjustment.

It is also advantageous if at least one Andruckmotor is designed as a hydraulic cylinder. On the one hand, a hydraulic cylinder can generate relatively high forces; on the other hand, it is also possible to realize relatively large displacement paths.

It is particularly advantageous if at least one pressure motor is designed as a piezoelectric sensor. In this way, the pressure device and thus the grinding device can be adjusted very quickly.

It is furthermore particularly advantageous if the pressure device and / or the grinding device comprises at least one mass which can be deflected by a motor. Thus, another possibility is available to pressurize the pressure device and / or the grinding device with a force.

It when the grinding device has a plurality of independently controllable pressure devices which act on portions of the metal strip, which are spaced apart in a widthwise extension of the metal strip is particularly advantageous. In other words, the grinding device or its pressure device is segmented. The abrasive medium (e.g., abrasive belt, abrasive roll) can be pressed against the metal strip in the individual segments in this way to different extents. As a result, a comparatively wide path can be ground on the metal strip in one pass, without having to forego an individually adjustable ablation.

It is also favorable if the presented arrangement comprises a spraying device acting on the grinding medium of the grinding device and / or the metal strip. In this way, the grinding device and the metal strip can be cleaned of dirt or cooled.

It is advantageous in the above context, when the grinding medium is designed as a grinding belt and the spray is arranged in the region of a drive roller for the grinding belt and / or a deflection roller for the grinding belt. In particular, it is advantageous if the spraying device is oriented at an angle which deviates from the normal to the drive roller / deflection roller on which the spraying device acts. In this way, dirt from the sanding belt can be removed particularly well, since the centrifugal forces acting in the area of the drive / deflection roller have a supporting effect on the cleaning.

It is also favorable if the spraying device acts on a region of the metal strip which is arranged in the direction of movement of the metal strip immediately in front of the grinding device is. In this way, the metal strip is again cleaned / cooled immediately before grinding. To keep dirt in front of the processing point behind the second sprayer also a wiper lip may be provided.

It is also particularly advantageous if the control / regulation is set up to detect a vibration of the pressure device and / or grinding device and to drive at least one pressure motor and / or the at least one motor-deflectable mass substantially in the opposite phase to the detected vibration. Due to hardly avoidable vibrations in the grinding device, despite a triggering of the pressure motor in the above-mentioned manner, a ripple in the height profile may result in the end result. In order to further improve the grinding result, it may now be provided to detect a vibration of the pressure device and / or grinding device and to actuate the pressure motor and / or the at least one motor-deflectable mass substantially in antiphase to the detected vibration, so that the height profile achieved is largely straight ,

It is also particularly advantageous in this context if, in addition to a fundamental vibration of the pressure device and / or grinding device, at least one harmonic thereof is also used to control the pressure motor and / or the at least one mass that can be deflected by a motor. Thereby, the result of the grinding process can be further improved.

It is advantageous if the metal strip and an abrasive medium of the grinding device are moved during the grinding in synchronism. As a result, grinding dust is kept away from the processing site.

It is also advantageous if a cutting speed during grinding is selected on the basis of the determined thickness / surface. Specifically, the cutting speed can be increased with high desired removal over the cutting speed with low desired removal and vice versa. The cutting speed is generally determined by the relative speed between metal strip and abrasive medium.

It is also advantageous if a speed of the metal strip during grinding is selected on the basis of the determined thickness / surface. Specifically, the belt speed at high desired removal compared to the belt speed can be lowered with low desired removal and vice versa. In general, the belt speed determines the residence time of the metal strip on the grinding device.

In addition, it is favorable if, for the movement / pressing of the grinding device, the inertia of the pressing device is taken into account. For example, a change in movement / pressure is already initiated before this would be indicated on the basis of the determined actual height / thickness / roughness profile. This means that, for example, an increase in the pressure is increased / decreased already somewhat before the appearance of a mountain / valley in order to compensate for delays in the control and also the inertia of the pressure device, so that the selected pressure is already present when the mountain / valley arrives at the grinding device.

It is also particularly advantageous if the duration of use / the completed grinding work of a grinding medium of the grinding device is taken into account for the movement / pressing of the grinding device. If an abrasive medium is used for a long time or intensively, its grinding effect diminishes, which is why the contact pressure with respect to the new condition of the grinding medium increases somewhat and / or the desired removal can be reduced somewhat. This procedure is particularly advantageous if the determination of the actual height / thickness / roughness profile (once) takes place before the grinding and the grinding process is accordingly controlled only on the basis of the determined "map". In a database, data on the degradation of different types of abrasive media (eg abrasive media with different grain sizes and / or different abrasive materials) can be stored and recalled during grinding. For example, the removal rate per period of use / grinding work, the necessary contact pressure for a specific removal rate depending on the period of use / grinding work and / or the required cutting speed for a specific removal rate depending on the duration / grinding work can be determined empirically and stored in said database. Of course, the data can also be stored using approximate formulas. The grinding work corresponds to the temporal integral of the grinding performance or removal rate and is measured, for example, in MJ.

It is also advantageous if a request for the change of the grinding medium is issued if its duration of use / its completed grinding work exceeds a predefinable threshold. In this way it is avoided that it is ground with an already used abrasive belt to avoid overheating of the metal strip and / or other (possibly irreparable) damage to the metal strip.

It is also advantageous if only a force delivery (and no Wegzustellung) takes place during grinding. A Wegzustellung done only when placing the grinder on the metal strip at the beginning of the grinding process when lifting the grinder from the metal strip at the end of the grinding process. In this way, inaccuracies of the metal strip, the metal strip contacting rollers and the grinder can be compensated because the pressure is maintained at the desired level regardless of the aforementioned unevenness and inaccuracies, the grinder these bumps and inaccuracies because of the path independence of the control / regulation however, it can follow. The grinding device is stored so to speak "floating".

It is favorable if the measurement of the thickness / surface of the metal strip takes place at another, in particular at a lower, belt speed than the grinding thereof. As a result, the measured value acquisition does not need to be adapted to the grinding process. As a rule, higher measuring accuracies can also be achieved at a slower belt speed.

Fig. 1

ein erstes schematisch dargestelltes Beispiel einer Schleifvorrichtung für ein Metallband;

Fig. 2

ein beispielhaftes Höhenprofil des Metallbands mit einem eingezeichneten Soll-Schleifabtrag;

Fig. 3

ein Schleifergebnis nach dem Stand der Technik;

Fig. 4

ein mit dem erfindungsgemäßen Verfahren erzieltes Schleifergebnis;

Fig. 5

ein beispielhaftes Höhenprofil des Metallbands, welches eine Periodizität aufweist;

Fig. 6

wie Fig. 1, nur mit verschiedenartigen in Serie geschalteten Andruckmotoren;

Fig. 7

wie Fig. 1, nur mit einer auslenkbaren Masse auf der Schleifvorrichtung;

Fig. 8

wie Fig. 1, nur mit einer Unterstützungsrolle;

Fig. 9

ein Beispiel für eine Schleifeinrichtung, die im Bereich einer Antriebs-/Umlenkrolle des Metallbands wirkt.

Fig. 10

wie Fig. 1, nur mit Sprüheinrichtungen und

Fig. 11

ein Beispiel für eine Schleifeinrichtung mit voneinander unabhängig steuerbaren Segmenten einer segmentierten Andrückvorrichtung.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures. Show it:

Fig. 1

a first schematically illustrated example of a grinding device for a metal strip;

Fig. 2

an exemplary height profile of the metal strip with an indicated target Schleifabtrag;

Fig. 3

a grinding result according to the prior art;

Fig. 4

a grinding result obtained by the method according to the invention;

Fig. 5

an exemplary height profile of the metal strip, which has a periodicity;

Fig. 6

as Fig. 1 , only with various pressure motors connected in series;

Fig. 7

as Fig. 1 only with a deflectable mass on the grinder;

Fig. 8

as Fig. 1 only with a supporting role;

Fig. 9

an example of a grinding device which acts in the region of a drive / deflection roller of the metal strip.

Fig. 10

as Fig. 1 , only with sprayers and

Fig. 11

an example of a grinding device with independently controllable segments of a segmented pressing device.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to the new situation mutatis mutandis when a change in position.

Fig. 1 shows an arrangement 101 for grinding a metal strip 2, comprising a grinding device 3, a pressing device 4 acting on the grinding device 3 with at least one pressure motor 5 for moving / pressing the grinding device 3 against the called metal strip 2, a measuring device 6 for measuring the thickness / surface of the metal strip 2 and a drive 7 for moving the metal strip 2 relative to the grinding device. 3

Optionally, it may also be provided that the grinding device 3 additionally or alternatively to the drive 7 relative to the metal strip 2 along (in the Fig. 1 horizontally) is displaceable. Similarly, it is conceivable that the metal strip 2 additionally or alternatively to the pressure motor 5 with respect to the grinding device 3 transversely (in the Fig. 1 vertically) is displaceable.

Specifically, the grinding device 3 in this example comprises a carrier 8, in which three rollers 9, 10 and 11 are rotatably mounted. To these rollers 9, 10 and 11, one or more of which are designed as a drive roller (s), a grinding belt 12 is guided. On the support 8, one end of a hydraulic cylinder 5 is fixed, which acts as a pressure motor in this example. The other end is supported on a fixed bearing 13. The metal strip 2 is guided around the drive roller 7 and around the deflection roller 14. Furthermore, the arrangement 101 comprises a control / regulation 15, to which the input side, the measuring device 6 is connected, which is formed for example as an ultrasonic sensor. On the output side, the control / regulation 15 is connected to the hydraulic cylinder 5.

In the in Fig. 1 Example shown is ground in a straight portion of the metal strip 2, which is advantageous for the grinding result, since the radius of a ground recess relative to the radius of the roller 9 can not decrease. In principle, however, 7 or 14 can also be ground in the area of the rollers (compare also Fig. 9 ).

• Mit Hilfe des Antriebs 7 wird das Metallband 2 an der Messeinrichtung 6 vorbeigeführt, welche ein Höhen-, Dicken- beziehungsweise Rauigkeitsprofil des Metallbands 2 erfasst. Fig. 2 zeigt dazu ein Beispiel, bei dem die Höhe h des Metallbands 2 und somit dessen Dicke über der zurückgelegten Wegstrecke s dargestellt ist (dicke durchgezogene Linie). Äquivalent kann das Höhen-, Dicken- beziehungsweise Rauigkeitsprofil auch über die Zeit t aufgetragen sein, die über die Drehzahl des Antriebs 7 mit der Wegstrecke s zusammenhängt.

The function of in the Fig. 1 The arrangement 101 shown is as follows:

• With the help of the drive 7, the metal strip 2 is guided past the measuring device 6, which detects a height, thickness or roughness profile of the metal strip 2. Fig. 2 shows an example in which the height h of the metal strip 2 and thus its thickness over the distance traveled s is shown (thick solid line). Equivalently, the height, thickness or roughness profile can also be plotted over the time t, which is related to the distance s via the rotational speed of the drive 7.

When grinding the metal strip 2, the pressure motor 5 is now controlled via the control / regulation 15 on the basis of the determined actual height / thickness / roughness profile. Specifically, the grinding should be done according to the thin line (target removal). For this purpose, the contact pressure is increased at those points of the metal strip 2, which have a large thickness / height or roughness. At the mountain peaks thus the contact pressure is particularly increased.

Fig. 3 now shows a result according to the prior art, in which the grinding device 3 is lifted in the valleys A, since there no ablation must take place. However, it can also be seen in the resulting height / thickness / roughness profile that at the end of the valleys A, a dent B is formed by the replacement of the grinding device 3. In part, these are even deeper than the adjacent valley A, which runs counter to the actual purpose of the grinding process, namely the homogenization of the thickness of the metal strip 2.

Fig. 4 shows a grinding result in which the pressure of the grinding device 3 against the metal strip 2 is not lowered below a minimum value even when a grinding due to the determined height h / thickness / surface respectively due to the selected target removal would not be necessary per se. This means that even in the valleys A there is an abrasion removal, albeit less. Advantageously, the in a method after Fig. 3 occurring dents avoided. In addition, the surface in the valleys A is also leveled, which facilitates grinding in a subsequent grinding pass.

Like from the FIGS. 2 to 4 can be seen, a uniform thickness can not be achieved in a grinding pass. In this case, which is quite common in practice, grinding takes place in several passes. The thin line in the FIGS. 2 to 4 , which identifies the desired grinding abrasion, is then set slightly lower at each grinding pass until the desired thickness of the metal strip 2 is reached.

In the above example, it has been assumed that (only) the pressure motor 5 is controlled by the controller 15 on the basis of the detected actual height / thickness / roughness profile. It is also conceivable, however, for a cutting speed during grinding to be selected on the basis of the determined actual height / thickness / roughness profile. Is a high removal required, the cutting speed is increased, a less large removal is required, it is lowered accordingly. Similarly, the speed of the metal strip 2 can be selected based on the determined actual height / thickness / roughness profile. If a high removal is required, the belt speed is lowered to increase the residence time of the metal strip 2 on the grinding device 3. If only a small removal is required, the belt speed is increased to lower the residence time of the metal strip 2 on the grinding device 3.

It is also conceivable that for the moving / pressing of the grinding device 3, the duration / the completed grinding work of the grinding belt 12 is taken into account. If the sanding belt 12 has been in use for a long time or intensively, its grinding effect diminishes, which is why the contact pressure with respect to the new state of the sanding belt 12 is slightly increased and / or the target removal can be slightly reduced. This procedure is particularly advantageous if the determination of the actual height / thickness / roughness profile (once) takes place before the grinding and the grinding process is accordingly controlled only on the basis of the determined "map". Data on the degradation of different types of abrasive belts 12 can be stored in a database and retrieved accordingly during the grinding process. For example, the removal rate per period of use / grinding work, the necessary contact pressure for a specific removal rate depending on the period of use / grinding work and / or the required cutting speed for a specific removal rate depending on the duration / grinding work can be determined empirically and stored in said database. Of course, the data can also be stored using approximate formulas.

It is also advantageous if a request for the change of the abrasive belt 12 is issued if its duration of use / its completed grinding work exceeds a predefinable threshold. In this way it is avoided that it is ground with an already used abrasive belt 12 in order to avoid overheating of the metal strip 2 and / or other (irreparable) damage to the metal strip 2.

The measurement of the thickness / surface of the metal strip 2 is generally carried out before the same. In particular, the measuring device 6 is arranged in front of the grinding device 3 in the direction of movement of the metal strip 2 / the grinding device 3. For example can be provided during the measurement of the metal strip 2 a complete run of the same without this being ground. In this case, as it were a "map" of the metal strip 2 are stored in a memory, which is used as a result of the control / regulation 15 to control the Andruckmotor 5. In particular, the measurement of the thickness / surface area of the metal strip 2 is at a different (in particular at a lower) belt speed than the grinding thereof. As a result, the measured value acquisition does not need to be adapted to the grinding process. As a rule, higher measuring accuracies can also be achieved at a slower belt speed. It is also conceivable that the metal strip 2 is measured simultaneously to the grinding process. In a particularly advantageous variant of the presented method, the metal strip 2 is measured / ground in several passes. In general, the grinding process can be controlled or regulated.

For exact positioning of the metal strip 2, or for the determination of the path s for the height profile, the drive roller 7 may be provided with a rotary encoder. It is also conceivable that the metal strip 2 itself is provided with one or more position marks that can be optically detected, for example. It is advantageous if the inertia of the pressing device 4 is taken into account for the movement / pressing of the grinding device 3. For example, a change in movement / pressure is already initiated before this would be indicated on the basis of the determined actual height / thickness / roughness profile. This means that, for example, an increase in the contact pressure is increased somewhat before the appearance of a mountain in order to compensate for delays in the activation and also the inertia of the pressing device 4, so that the selected pressure is already present when the mountain arrives at the grinding device 3.

Due to hardly avoidable (intrinsic) vibrations in the grinding device 3, despite a triggering of the pressure motor 5 in the end result, a (in particular uniform) ripple of the height profile may occur. Fig. 5 shows an example with so-called "chatter marks" in the strip surface. These are undulating structures that typically have a depth of 1μ and a length of about 7mm. Basically, the chatter marks are undesirable. In order to further improve the grinding result, it is possible to detect a vibration of the pressure device 4 and / or grinding device 3 and the pressure motor 4 essentially in the opposite phase to the detected vibration head for. In this way, despite the vibrations mentioned a uniform height profile can be achieved.

Advantageously, the measuring device 6, as in the Fig. 1 represented, offset from the grinding device 3, so that said vibrations can not or only to a limited extent on the measuring device 6 and on the measuring device 6 opposite portion of the metal strip 2 can be transmitted. The measurement of the thickness / surface of the metal strip 2 can therefore be done comparatively accurately.

Under certain circumstances, the hydraulic cylinder 5 is too sluggish to follow a comparatively high-frequency oscillation. In order nevertheless to be able to achieve a uniform course, the pressure device 4 can comprise at least one group, each with two pressure motors coupled in series and different in terms of their drive type. Fig. 6 shows an arrangement 102, which of the arrangement 101 from Fig. 1 is very similar. In contrast, however, a hydraulic cylinder 5 is arranged in series with a piezoelectric sensor 16. With the help of the piezoelectric encoder 16, it is now possible to compensate for high-frequency vibrations. The contact pressure / the pressure movement of the hydraulic cylinder 5 is superimposed on the contact pressure / the pressure movement of the piezoelectric sensor 16.

In general, it is possible to control slow compensating movements via the relatively sluggish hydraulic cylinder 5, rapid compensation movements via the relatively quickly reacting piezoelectric sensor 16. In particular, in addition to a fundamental vibration of the pressure device 4 and / or grinding device 3, at least one harmonic of the same can also be used for the control of the pressure motors 5 and 16. By means of a crossover network, low-frequency oscillation components on the hydraulic cylinder 5, high-frequency components on the piezoelectric sensor 16 can be passed.

Alternatively or in addition to a second pressure motor 16, it is also possible to provide at least one motor-deflectable mass 17 on the pressure device 4 and / or the grinding device 3. Fig. 7 shows a device 103, which in turn of the device 101 of the Fig. 1 is very similar. In this case, however, a vertically movable mass 17, which, for example, can be deflected electromagnetically, is located on the carrier 8 is. Preferably, a mass-spring system is adapted to the frequency of the vibration to be compensated, that is, the natural frequency of the mass-spring system largely corresponds to the frequency of the vibration to be compensated. In order to be able to filter out different harmonics optimally, it is also possible to provide several mass-spring systems with different natural frequencies. Slow compensation movements are now controlled again via the relatively sluggish hydraulic cylinder 5, rapid compensation movements via the relatively rapidly reacting mass 17.

Fig. 8 now shows an embodiment of an assembly 104, which in the Fig. 1 shown arrangement 101 is very similar. In contrast, however, a support roller 18 for the metal strip 2 is arranged in the region of the grinding device 3. As a result, an excessive yielding of the metal strip 2 during pressing of the grinding device 3 is avoided.

Fig. 9 shows a further embodiment of an arrangement 105, which in the Fig. 1 shown arrangement 101 is very similar. In contrast, however, the grinding device 3 is not arranged in a straight portion of the metal strip 2, but in the region of the deflection roller 14. The measuring device 6 is arranged in the region of the deflection roller 14. Due to the relatively high tensile forces with which the metal strip 2 is stretched, this is very tight on the guide roller 14, whereby the grinding process and the measuring can be done very accurately. A separate support role 18, as in Fig. 8 can therefore be omitted. Completely equivalent, the grinding device 3 and the measuring device 6 can also be arranged in the region of the drive roller 7. It is also conceivable that the grinding device 3 is arranged on the deflection roller 14 and the measuring device 6 on the drive roller 7 or vice versa.

Fig. 10 shows still another embodiment of an arrangement 106, which in the Fig. 1 shown arrangement 101 is very similar. In contrast, however, this has a force acting on the abrasive belt 12 of the grinding device 3 and the metal strip 2 first and second spray 19 and 20. In this way, the abrasive belt 12 and the metal strip 2 can be cleaned or cooled by means of a grinding emulsion. Concretely, a wet grinding process is realized in this way.

It is advantageous if the first spraying device 19, as in the Fig. 10 shown, is arranged in the region of the guide roller 11. Due to the centrifugal force acting excess abrasive emulsion and dirt are ejected particularly well from the sanding belt 12. Completely equivalent, the first spraying device 19 could also be arranged on the deflection roller 10 for this purpose.

It is particularly advantageous if the first spraying device 19, as in the Fig. 10 is shown aligned at an angle which deviates from the normal to the guide roller 11, on which the first spray device 19 acts. That is, the first spraying device 19 is aligned flat on the guided around the guide roller 11 grinding belt 12. In this way, excess abrasive emulsion and dirt are even better thrown off the abrasive belt 12

Finally, it is also advantageous if the second spraying device 20, as in the Fig. 10 shown acts on a portion of the metal strip 2, which is arranged in the direction of movement of the metal strip 2 immediately in front of the grinding device 3. In this way, the metal strip 2 is again cleaned / cooled immediately before grinding. To keep dirt in front of the processing point behind the second spraying device 20 and a scraper lip, not shown, may be provided.

From the Fig. 10 also shows that the metal strip 2 and the grinding belt 12 are moved during grinding in synchronism. In this way, dirt can also be kept away from the processing site. In principle, of course, a grinding in the opposite direction is conceivable.

The Fig. 11 shows finally a section of a variant of an arrangement 107, in which the grinding device 3 has a plurality of independently controllable pressure devices 4, which act on portions of the metal strip 2, which are spaced apart in a widthwise extension of the metal strip 2. The arrangement 107 is shown in front view, that is to say that the direction of movement of the metal strip 2 normal to the plane of the sheet Fig. 11 is aligned. Specifically, the assembly 107 comprises a sanding belt 12 and a plurality of juxtaposed pressing devices 4. Each pressing device 4 comprises a roller 9 (which is not necessarily designed as a drive roller), a pressure roller 21, which is rotatably mounted in a bracket 22, and a pressure motor 5. The rollers 9 are mounted in a circumferentially engaging bearing 23. The special design allows a more or less seamless juxtaposition of rollers 9. Nevertheless, the rollers 9 can be acted upon by the Andruckmotoren 5 and the pinch rollers 21 with a different pressure, whereby the roles of a roller 9 associated areas of the abrasive belt 12 different amount of metal strip 2 , In this way, a comparatively wide path can be ground on the metal strip 2 in one pass. In particular, it is possible that the arrangement 107 extends over the entire width of the metal strip 2. Of course, only two or more than three separate rollers 9 or pressure devices 4 may be provided. To improve the transition between the rollers 9, they can also be (slightly) cambered.

In the above examples it was assumed that the abrasive medium used is an abrasive belt 12. Instead of the grinding belt 12, however, it is of course also possible for example to use a grinding roller which is pressed against the metal belt 2.

In general, it is advantageous if only a power delivery takes place during grinding. This means that no grinding is carried out during grinding, except when the grinding device 3 is placed at the beginning of the grinding process on the metal strip 2 or this is lifted off the metal strip 2 after grinding. In this way, inaccuracies of the metal strip 2 facing the drive roller 9, the drive roller 7, the guide roller 14 and the support roller 18 and ultimately the metal strip 2 can be compensated because the pressure regardless of the aforementioned unevenness and inaccuracies is maintained at the desired level However, the grinding device 3 can follow these bumps and inaccuracies because of the path independence of the control / regulation. The grinding device 3 is accordingly "floating" relative to the metal strip 2, the drive roller 7, the guide roller 14 and the support roller 18, respectively.

At this point it is noted that in the FIGS. 8 to 10 illustrated embodiments 104..106 have only one Andruckmotor 15, of course, mutatis mutandis but also to embodiments with two pressure motors 5, 16 (FIG. Fig. 6 ) or with a deflectable mass 17 ( Fig. 7 ) Respectively.

The embodiments show possible embodiments of grinding devices 101..107, which should be noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but also various combinations of the individual embodiments are possible with each other and this variation possibility due to the teaching of technical action by objective invention in the skill of working in this technical field expert. So are all conceivable embodiments, which are possible by combinations of individual details of the illustrated and described embodiment variant, includes the scope of protection. For example, in the Fig. 7 In addition to the deflectable mass 17, a second Andruckmotor 16 are provided. It should also be noted that the individual embodiments may also be able to be protected independently of the features of the independent claims. In particular, this may be the spray equipment ( Fig. 10 ), the segmented pressure device ( Fig. 11 ) as well as the consideration of the duration of use / the completed grinding work.

In particular, it is also noted that the illustrated grinders 101... 107 may in reality also comprise more or fewer components than illustrated. For example, the sanding belt 12 can also be steered over more or fewer rollers 9, 10, 11 or even consist of only one sanding roller or one sanding pad. The sanding belt 12 may also be guided transversely to the longitudinal extent of the metal strip 2.

For the sake of the order, it should finally be pointed out that the grinders 101, 107, as well as their components, have been shown to be somewhat inhomogeneous and / or enlarged and / or reduced in size for a better understanding of their construction.

REFERENCE NUMBERS

101..107

grinding system

2

metal band

3

grinder

4

pressure device

5

(first) pressure motor (hydraulic cylinder)

6

measuring device

7

capstan

8th

carrier

9

capstan

10

idler pulley

11

idler pulley

12

sanding belt

13

fixed bearing

14

idler pulley

15

Control / regulation

16

(second) pressure motor (piezoelectric sensor)

17

deflectable mass

18

support role

19

(first) spraying device

20

(second) spraying device

21

pinch

22

hanger

23

roller bearing

A

valley

B

dent

H

height

s

path

t

Time

Claims (24)

1. Assembly (101...107) for grinding a metal strip (2), comprising

   - a grinding device (3),

   - a pressing device (4) that acts upon the grinding device (3) and features at least one pressing motor (5, 16) for moving/pressing the grinding device (3) against said metal strip (2),

   - a measuring device (6) for measuring the thickness/surface of the metal strip (2) arranged in front of the grinding device (3) referred to the moving direction of the metal strip (2) / the grinding device (3), and

   - a drive (7) for moving the metal strip (2) relative to the grinding device (3) and/or vice versa,

   characterized in that

   - an open loop control/closed loop control (15) is provided and connected to the measuring device (6) and to the at least one pressing motor (5, 16), wherein said open loop control/closed loop control (15) is designed to conduct moving/pressing the grinding device (3) based on the determined thickness/surface, but to avoid lowering the contact pressure of the grinding device (3) against the metal strip (2) below a minimum value even if grinding as such would not be necessary based on the determined thickness/surface.
2. Assembly (101... 107) according to claim 1, characterized in that the measuring device (6) comprises or is formed by at least one ultrasonic sensor.
3. Assembly (101... 107) according to claim 1 or 2, characterized in that the pressing device (4) comprises at least one group, which respectively features two pressing motors (5, 16) that are coupled in series and differ with respect to their driving mode.
4. Assembly (101... 107) according to one of claims 1 to 3, characterized in that at least one pressing motor is realized in the form of a hydraulic cylinder (5).
5. Assembly (101... 107) according to one of claims 1 to 4, characterized in that at least one pressing motor is realized in the form of a piezoelectric transducer (16).
6. Assembly (101... 107) according to one of claims 1 to 5, characterized in that the pressing device (4) and/or the grinding device (3) comprises at least one mass (17), which can be moved in a motor-driven fashion.
7. Assembly (101... 107) according to one of claims 1 to 6, characterized by an open loop control/closed loop control (15) that is designed for detecting an oscillation of the pressing device (4) and/or grinding device (3) and for activating at least one pressing motor (5, 16) and/or the at least one mass (17), which can be moved in a motor-driven fashion, essentially in antiphase to the detected oscillation.
8. Assembly (101... 107) according to one of claims 1 to 7, characterized in that the grinding device (3) features several pressing devices (4), which can be activated independently and act upon regions of the metal strip (2) that are spaced apart from one another referred to the width of the metal strip (2).
9. Assembly (101... 107) according to one of claims 1 to 8, characterized by a spraying device (19,20) that acts upon the abrasive medium (12) of the grinding device (3) and/or the metal strip (2).
10. Assembly (101... 107) according to claim 9, characterized in that the abrasive medium is realized in the form of an abrasive belt (12) and a first spraying device (19) is arranged in the region of a driving roller (9) for the abrasive belt (12) and/or a deflection roller (10, 11) for the abrasive belt (12).
11. Assembly (101...107) according to claim 10, characterized in that the first spraying device (19) is aligned at an angle other than the normal on the driving roller (9) / deflection roller (10, 11), upon which the first spraying device (19) acts.
12. Assembly (101... 107) according to one of claims 9 to 11, characterized in that a second spraying device (20) acts upon a region of the metal strip (2), which is arranged directly in front of the grinding device (3) referred to the moving direction of the metal strip (2).
13. Method for grinding a metal strip (2), comprising the steps of

    - measuring the thickness/surface of the metal strip (2) prior to its grinding,

    - moving/pressing the grinding device (3) against said metal strip (2) and/or vise versa, and

    - moving the metal strip (2) in its longitudinal direction relative to the grinding device (3) and/or vice versa,

    characterized in that

    - the grinding device (3) is moved/pressed based on the determined thickness/surface, wherein the contact pressure of the grinding device (3) against the metal strip (2) is not lowered below a minimum value even if grinding as such would not be necessary based on the determined thickness/surface.
14. Method according to claim 13, characterized in that an oscillation of a pressing device (4) and/or grinding device (3) is detected and a pressing motor (5, 16) and/or at least one mass (17), which can be moved in a motor-driven fashion, is essentially activated in antiphase to the detected oscillation.
15. Method according to claim 14, characterized in that not only a fundamental oscillation of the pressing device (4) and/or grinding device (3), but also at least one harmonic component thereof is used for the activation of the pressing motor (5, 16) and/or the at least one mass (17), which can be moved in a motor-driven fashion.
16. Method according to one of claims 13 to 15, characterized in that the metal strip (2) and an abrasive medium (12) of the grinding device (3) are moved in the same direction during the grinding process.
17. Method according to one of claims 13 to 16, characterized in that a cutting speed during the grinding process is selected based on the determined thickness/surface.
18. Method according to one of claims 13 to 17, characterized in that a speed of the metal strip (2) during the grinding process is selected based on the determined thickness/surface.
19. Method according to one of claims 13 to 18, characterized in that the inertia of the pressing device (4) is taken into consideration in moving/pressing the grinding device (3).
20. Method according to one of claims 13 to 19, characterized in that the period of use / the accomplished grinding work of an abrasive medium (12) of the grinding device (3) is taken into consideration in moving/pressing the grinding device (3).
21. Method according to one of claims 13 to 20, characterized in that a request for the replacement of the abrasive medium (12) is output once its period of use / its accomplished grinding work exceeds a predefined threshold value.
22. Method according to one of claims 13 to 21, characterized in that only a force infeed takes place during the grinding process.
23. Method according to one of claims 13 to 22, characterized in that the measurement of the thickness/surface of the metal strip (2) takes place at a different strip speed than its grinding.
24. Method according to one of claims 13 to 23, characterized in that the abrasive medium (12) of the grinding device (3) and/or the metal strip (2) is cleaned/cooled by means of a grinding emulsion.

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