EP3370916A1

EP3370916A1 - Method and device for producing a homogeneous, ground surface of a metal strip

Info

Publication number: EP3370916A1
Application number: EP16793801.8A
Authority: EP
Inventors: Herbert BLOCHBERGER; Roland Schuster
Original assignee: Berndorf Band GmbH
Current assignee: Berndorf Band GmbH
Priority date: 2015-11-03
Filing date: 2016-11-02
Publication date: 2018-09-12
Anticipated expiration: 2036-11-02
Also published as: AT517879B1; WO2017076905A1; SI3370916T1; CN108349057A; CN108349057B; AT517879A1; HRP20201814T1; HUE052535T2; EP3370916B1

Abstract

The invention relates to a method for the production of a metal strip (1), in which the metal strip (1) is ground in a plurality of passes at least on one side on substantially the entire surface. During a final grinding passage, the metal strip (1) is ground with an aged or worn grinding medium (4, 8, 12). The invention further relates to a device for the production of a metal strip (1), comprising two rollers (2, 3) or two reels (13, 14) for holding and moving the metal strip (1), as well as to a grinding device (4 8, 12). Furthermore, the device comprises means for determining an age or wear (A) of a grinding medium (4, 8, 12) and for outputting an alarm when, during a final grinding passage, a grinding medium (4, 8, 12) does not correspond to a predetermined age or predetermined wear (A).

Description

Method and device for producing a homogeneous, ground surface of a metal strip

The invention relates to a method for the production of a metal strip, in which the metal strip is ground in several passes at least on one side on substantially the entire surface. Likewise, the invention relates to a device for the manufacture of a metal strip comprising two rollers or two reels for holding and moving the metal strip, and a grinding device for grinding the metal strip in multiple passes at least on one side and on substantially the entire surface.

In principle, methods and devices for grinding metal strips of the prior art are known. Such metal strips are produced for certain applications with a very high surface quality and are usually polished or even polished. The metal strips are used, for example, for the production of plate-like or film-like materials, in particular for films for photography, LCD screens or for engineered stone, in which a liquid or pasty material is applied to a driven / moving belt and The surface quality of the product produced with such a metal strip depends directly on the surface quality of the metal strip.

The problem is that with conventional grinding a sufficiently homogeneous surface of the metal strip can be made difficult. Such bands sometimes have an area of several hundred square meters, which are to be ground. As can easily be imagined, it is difficult to realize a homogenous microsection across the entire surface of the strip. Along with this, the products produced with this metal strip also have no uniform surface.

An object of the invention is therefore to improve the grinding of a metal strip, or to produce an improved metal strip. In particular, the metal strip should be ground so that a homogeneous strip surface is formed in order to meet the above requirements. This object is achieved by a method of the type mentioned above, in which the metal strip is ground in a final grinding pass (at least on one side on substantially the entire surface) with an aged or worn abrasive medium. In other words, the final grinding pass is started with an aged or worn abrasive medium, or the final grinding pass is carried out entirely with an aged or worn abrasive medium.

The object of the invention is also achieved with a metal strip, which is produced by a method of the type mentioned above.

Finally, the object of the invention is also achieved with a device of the type mentioned above, additionally comprising means for determining an age respectively a wear of a grinding medium and to issue an alarm when an abrasive medium in a final grinding pass does not correspond to a predetermined age or a predetermined wear ,

The proposed measures a particularly flat and high quality surface of the metal strip is achieved. In this case, one makes use of the fact that an aged or already worn abrasive medium has only a slight degradation and the grinding result is subjected to only a small change for a long time. In contrast, for a high-quality grinding result in the prior art mostly recourse to new and unused grinding media as far as possible. However, this procedure leads only to relatively small surfaces to be ground to success or to a homogeneous microsection. For large areas, however, the wear of the abrasive particles, which is particularly large in a new abrasive medium, comes into play. Tips and sharp edges on the abrasive grains are rounded relatively quickly, but the rounded edges remain for a comparatively long time. With the same grain size, a much more homogeneous and smoother grinding pattern can be achieved with a used abrasive medium than with a new abrasive medium.

The purpose of the grinding may be, for example, to grind the metal strip to a certain thickness and / or to ensure a certain thickness uniformity and / or to produce a specific surface finish. For example, a tolerance band for the thickness of the metal strip

+/- 100 μιη amount to a certain nominal dimension, whereas the tolerance for the thickness uniformity is only +/- 25 μιη. The thickness of the metal strip should therefore be within each tolerance band at each point. The surface texture can be defined, for example, by the surface roughness and / or the degree of gloss. The surface roughness is usually given in μιη, where the indication can mean the average roughness, square roughness or average roughness. It should be noted at this point that the invention relates not only to bonded abrasive media but also to loose abrasive particles. In particular, the invention therefore also relates to abrasive pastes in which abrasive particles are present, for example, in aqueous or oily solution. "Substantially the entire surface" in the context of the invention means in particular a proportion of at least 90% of the entire strip surface of a strip side. Smaller areas may be excluded from processing, such as the area around a weld to connect the tape ends to an endless belt. Of course, the method is not limited to the grinding of a band side, but it can also be sanded both sides of the band.

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 advantageous if the metal strip is ground in a final grinding pass with an abrasive medium having a minimum wear. This avoids that the degradation of the grinding medium is too strong.

It is also advantageous if the metal strip is ground in a final grinding pass up to a maximum wear of the grinding medium. In this way it is ensured that the abrasive medium still has a sufficiently high removal rate or a sufficiently long residual service life. In general, the wear of the grinding medium can be determined in various ways. For example, the wear can be determined based on the duration of use of the grinding medium. It is also conceivable that the wear is determined by the number of grinding cycles, that is, how often an abrasive grain is in engagement with the metal strip. Another influencing factor is the cycle engagement time, that is, the period during which an abrasive grain engages the metal strip in one cycle. A very similar influencing factor is the cycle engagement path, that is, the path length that an abrasive grain engages the metal strip in one cycle. Finally, the contact pressure of the grinding medium on the metal strip has an influence on the wear of the grinding medium. For example, the wear can be determined by the following formulas:

Wear = factor x engagement force x cycle engagement path x number of cycles or

Wear = factor x engagement force x cycle engagement time x number of cycles

For the abrasive particles are generally natural grain materials (quartz, corundum, emery, garnet, natural diamond) and synthetic grain materials (corundum, silicon carbides, chromium oxides, cubic boron nitride, diamonds) in question. It is particularly advantageous if the final grinding pass is carried out with a hard-bonded abrasive medium. With this type of abrasive media, the abrasive particles remain relatively long in the matrix in which they are embedded. Therefore, the rounded edges of the abrasive particles remain in effect for a long time before the abrasive particles break out and new abrasive particles with peaks and sharp edges are exposed. The strip surface becomes particularly homogeneous with these grinding media. Basically, however, the use of soft grinding media is conceivable. Generally, the hardness of abrasive media is given by the letters from D = very soft to T = very hard.

It is particularly advantageous if the final grinding pass is carried out with a single grinding medium. Advantageously, the processing time is kept short, and there are also steps in the strip surface after a change of the grinding medium prevented. However, it is also particularly advantageous if the final grinding pass is carried out with a plurality of aged or already used grinding media. In this way, the influence of the degradation of the grinding media can be further reduced. This procedure is particularly suitable for grinding particularly large metal bands.

It is also favorable if the metal strip is cross-grinded and longitudinally ground. Due to the "cross-cut", the strip surface is particularly flat

a) a first grinding means for transverse grinding of the metal strip transversely to its longitudinal direction and a second grinding means for longitudinal grinding of the metal strip in the longitudinal direction thereof or be provided

b) a single grinding device for transverse grinding of the metal strip transversely to its longitudinal direction and for longitudinally grinding the metal strip in the longitudinal direction thereof, wherein the single grinding device is rotatably mounted about an axis oriented transversely to the plane of the metal strip.

In transverse grinding, a feed in the longitudinal direction, for example, an oscillating movement can be superimposed in the transverse direction, or the movement is gradual, that is, a feed in the longitudinal direction takes place only when completed movement in the transverse direction.

It is also advantageous if a wider abrasive medium is used for longitudinal grinding than for transverse grinding. As a result, in transverse grinding a relatively high removal rate can be achieved with a comparatively low grinding pressure, whereas the surface of the metal strip is well leveled during longitudinal grinding by the wide abrasive medium.

In an advantageous variant of the manufacturing method, the transverse grinding and longitudinal grinding take place simultaneously at locations offset in the longitudinal direction of the metal strip. In this case, for example, a longitudinal grinding device is arranged in the feed direction behind a transverse grinding device. By this procedure, the metal strip can be made very fast. In another advantageous variant of the manufacturing process, the transverse grinding and longitudinal grinding takes place one behind the other. In this variant, the transverse grinding and the longitudinal grinding are decoupled from each other, which can be very specific influence on the grinding result. In addition, there is also the basic possibility to use only a single grinding device for transverse grinding and longitudinal grinding, which is rotated in each case by 90 °.

It is advantageous if the device for the production of a metal strip has a grinding wheel or grinding roller, or if the metal strip is ground with a grinding wheel or grinding roller. It is also beneficial if the device for the production of a metal strip has a grinding belt, or if the metal strip is ground with a grinding belt. The abovementioned grinding media are particularly suitable for the stated purpose because they have a long service life and thus enable efficient and dimensionally stable grinding.

It is advantageous if the contact between the metal strip and the abrasive medium during longitudinal grinding takes place on a line. As a result, homogenization / leveling of the strip surface can take place at relatively low grinding pressure. In particular, grinding wheels / sanding rollers or sanding belts which contact the belt surface along a line can be used for this purpose.

It is favorable if the abrasive medium touches the metal strip on a surface or if the contact between the metal strip and the abrasive medium takes place during grinding on a surface. As a result, the surface of the strip can be leveled particularly well in a homogenized, more respectful manner. In particular, sanding belts which lie flat on the metal strip are suitable for this purpose.

In a further advantageous variant of the manufacturing method, the metal strip is ground over the entire bandwidth. As a result, a particularly flat surface of the metal strip can be produced. In particular, it is advantageous if the longitudinal grinding takes place over the entire bandwidth. It is also advantageous if the metal strip is ground in a reduced area compared to the entire bandwidth. This allows the grinding process done very differentiated. By way of example, comparatively high removal can take place in a width region of the metal strip, whereas in a different width region of the metal strip a rather slight removal takes place.

It is also advantageous if the grinding process takes place on the endless, closed metal strip. In this way, the grinding operations can be performed well in several passes. For example, the transverse grinding can be carried out in several passes or also the longitudinal grinding.

It is also advantageous if the grinding process takes place on the open (= not closed) metal strip. In this way, the grinding process can take place even in the case of long belts in a narrow space, for example in which the band to be ground is unwound from one reel and the ground band is reeled onto another reel.

In principle, the sanding belt can also be laid without the use of reels.

It is also beneficial if the metal strip is ground dry. In this way, the resulting sanding dust can be sucked out well.

It is also favorable if the metal strip is ground wet or with the aid of a lubricant. In this way, the formation of grinding dust is prevented. In addition, the grinding medium is kept largely free of deposits, and the processing point is cooled. For wet grinding, for example, petroleum, oil or water can be used as a lubricant. Finally, the removal rate for wet grinding is usually higher than for dry grinding.

It is also favorable if an advancing movement between the grinding medium and the metal strip takes place counter to a grinding direction. On the one hand this achieves a high cutting speed, on the other hand the removal of the metal strip, ie the grinding dust or the grinding sludge from the ground already ground surface thrown away or kept away. The ground surface therefore remains relatively clean.

But it is also favorable if a feed movement between abrasive medium and metal strip is rectified to a grinding direction. On the one hand, the cutting speed is lowered, on the other hand, the removal of the metal strip, so the sanding dust or grinding sludge is thrown or kept away from the not yet ground surface. Therefore, virtually no grinding dust gets to the processing point, whereby high-quality grinding results can be achieved.

It should be noted at this point that the variants disclosed for the production method and the resulting advantages relate equally to the disclosed device and vice versa.

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

In each case, in a highly simplified, schematic representation:

1 shows a first arrangement for the production of a metal strip with a grinding roller for transverse grinding in side view.

Fig. 2 shows the arrangement of Figure 1 in plan view.

3 shows a second arrangement for the production of a metal strip with a belt grinding device for longitudinal grinding in side view;

4 shows the arrangement of Figure 3 in plan view.

Fig. 5 shows schematically the relationship between the roughness of the grinding medium and its wear; 6 shows a further arrangement for the production of a metal strip with a grinding roller for transverse grinding and a belt grinding device for longitudinal grinding in side view;

Figure 7 shows the arrangement of Figure 6 in plan view.

8 shows an arrangement with a single rotatably mounted belt grinding device in FIG

Side view;

9 shows the arrangement of Figure 8 in plan view.

Fig. 10 shows an arrangement for the production of a metal strip with a grinding wheel for

Transverse grinding and a grinding roller for longitudinal grinding in side view;

11 shows the arrangement of Figure 10 in plan view.

Fig. 12 shows an arrangement for grinding on the open metal belt with grinding wheel and

Belt grinding device in side view;

FIG. 13 shows the arrangement of FIG. 12 in plan view; FIG.

Fig. 14 shows an arrangement for grinding on the open metal band by means of a movable portal in side view and

Fig. 15 shows the arrangement of Fig. 14 in plan view.

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 selected in the description, such as top, bottom, side, etc. are related to the immediately described and illustrated figure and at a change of position to the new situation. Furthermore, individual features or combinations of features from the illustrated and described different embodiments may represent for themselves, inventive or inventive solutions.

Fig. 1 shows an exemplary and purely schematically illustrated system for manufacturing a metal strip in a side view, Fig. 2 in plan view. Specifically, Figures 1 and 2 show a metal strip 1, which is designed as an endless belt and is guided around two rollers 2 and 3, of which at least one is driven. Furthermore, in Fig. 1, a grinding roller 4 is shown.

With the aid of the device shown, the metal strip 1 can be ground transversely to its longitudinal extent. In the concrete example, the grinding roller 4 is used for this purpose, whose grinding direction (not the feed direction) is designated "B". This movement is effected by rotation of the grinding roller 4 about a horizontal, aligned along the metal strip 1 axis. The metal strip 1 is moved by means of the rollers 2 and 3 in the direction "C" and thus causes a longitudinal feed during transverse grinding.

In addition to the longitudinal feed in the direction C, transverse feed also takes place in the direction D transverse to the longitudinal direction of the metal strip 1. In this way, the welding area with the grinding roller 4 can be ground flat. In this case, the feed in the longitudinal direction C, for example, an oscillating movement in the transverse direction D is superimposed, such as triangular, sawtooth or sinusoidal course. The movement in the direction D can also be done gradually. In this case, a feed in the longitudinal direction C only takes place when the movement is completed in the transverse direction D. During the movement in direction D, the metal strip 1 is thus stopped.

The transverse grinding may be performed over the entire bandwidth or, for example, may be limited to an area reduced in relation to the entire bandwidth, which is denoted by "E" in FIG.

Fig. 3 shows a further exemplary and purely schematically illustrated system for manufacturing a metal strip 1 in side view, Fig. 4 in plan view. The plant again comprises a metal strip 1, which is designed as an endless belt and is guided around two rollers 2 and 3, at least one of which is powered. Furthermore, FIGS. 3 and 4 show a belt grinding device which comprises three deflection rollers 5, 6 and 7 as well as an abrasive belt 8. Finally, FIG. 1 also shows a counterplate 9 for supporting the metal strip 1 (note: the sensor 10 and the electronic evaluation or alarming unit 11 will be explained in connection with FIG. 5).

Instead of the counter-plate 9 could also be provided a support roller, or the grinding could in principle also be done without counter-plate 9 or support roller. The same applies to the system shown in FIGS. 1 and 2. Again, the grinding can be done with a back plate 9 or support role.

In this example, the metal strip 1 is ground in its longitudinal direction. In the concrete example, the belt grinder 6..8 is used for this purpose, whose grinding direction (not the feed direction) is denoted by "F". The metal strip 1 is moved by means of the rollers 2 and 3 in the direction "C" and thus causes a longitudinal feed during longitudinal grinding.

In the present method, the sanding roller 4 is used for the transverse grinding of the metal strip 1, and the sanding belt 8 for the longitudinal grinding. Although the abovementioned grinding media are well suited for the stated purpose, because they have a long service life and thus an efficient and dimensionally stable grinding but this is not the only option. Of course, it is also conceivable that the transverse grinding takes place with the grinding belt 8, or that the longitudinal grinding takes place with the grinding roller 4. In particular, it is also generally conceivable to use, instead of the grinding roller 4, a grinding wheel whose essential difference from the grinding roller 4 is the larger diameter / width ratio. Lower contact surface reduces the grinding pressure, which favors high removal rates.

5 shows schematically the relationship between the roughness R of the grinding medium 4, 8 and the wear A of the grinding medium 4, 8. As can be clearly seen in FIG. 5, the initial roughness R0 for a new grinding medium 4, 8 (FIG. Wear A0) is comparatively high and decreases rapidly. With increasing wear A, the roughness R then decreases less and less. That is, at the beginning, the abrasive particles of the grinding medium 4, 8 sharp points and edges, which are rounded relatively quickly. Although these rounded edges do not allow such a high removal rate, but have a relatively long life, or are subject to a relatively low degradation. This can be seen in FIG. 5 in that the decrease in the roughness R1-R0 or the degradation of the grinding medium 4, 8 in the interval A1-A0 is greater than the decrease in the roughness R2-R1 or the degradation in the interval A2-A1 , The drop in roughness R or the degradation thus runs nonlinear. This circumstance can now be exploited by grinding the metal strip 1 in several passes at least on one side on substantially the entire surface, wherein the metal strip 1 in a final, complete grinding passage at least on one side substantially entire surface with an aged respectively worn abrasive medium 4, 8 is ground. As a result, a particularly flat and high-quality surface of the metal strip 1 can be produced.

In general, the wear of the grinding medium 4, 8 can be determined in various ways. For example, the wear A can be determined based on the duration of use of the grinding medium 4, 8. It is also conceivable that the wear A is determined on the basis of the number of grinding cycles, that is, how often an abrasive grain is in engagement with the metal band 1. Another influencing factor is the cycle engagement time, that is, the period during which an abrasive grain in a cycle cycle is engaged with the metal strip 1. A very similar influencing factor is the cycle engagement path, that is, the path length, which is an abrasive grain in a cycle cycle in engagement with the metal strip 1. Finally, the contact pressure of the grinding medium 4, 8 on the metal strip 1 influence on the wear of the grinding medium. For example, the wear can be determined by the following formulas:

Wear = factor x engagement force x cycle engagement path x number of cycles or wear = factor x engagement force x cycle engagement time x number of cycles In particular, the metal strip 1 is ground in a final grinding pass with an abrasive medium 4, 8 which has a minimum wear. This avoids that the degradation of the grinding medium 4, 8 in the final grinding cycle is too strong. For example, the minimum wear can be defined by the value AI.

In particular, the metal strip 1 is ground in a final grinding pass also up to a maximum wear of the grinding medium 4, 8. In this way, it is ensured that the abrasive medium 4, 8 still has a sufficiently high removal rate or a sufficiently long residual service life. For example, the maximum wear can be defined by the value A2.

The device shown in FIGS. 3 and 4 comprises exemplary means for determining an age or wear of the abrasive belt 8 and for issuing an alarm when the abrasive belt 8 does not meet a predetermined age or wear in a final grinding pass. For this purpose, a sensor 10 and an electronic evaluation or alarm unit 11 are provided in the example shown. Specifically, the sensor 10 may be formed as a displacement sensor or rotary encoder or revolution. The wear of the abrasive belt 8 can then be given, for example, as a product of the cycle engagement path and the number of cycles, the cycle engagement path substantially corresponding to the horizontal distance of the two rollers 5 and 6 and the number of cycles indicating how many times a particular location of the abrasive belt 8 passes through this cycle engagement path, respectively. For example, the number of cycles can be determined as follows over the number of revolutions of the roller 5

Number of cycles = number of revolutions roll 5 x circumference roll 5 / length sanding belt 8

Of course, as stated above, the engagement force and / or a factor for determining the wear of the abrasive belt 8 can be used. Of course, alternatively or additionally, the cycle engagement time (ie, the time required for a particular location of the abrasive belt 8 to pass the cycle engagement path) or simply the operating time of the abrasive belt 8 may be used to determine wear. If the abrasive belt 8 used for the final grinding cycle does not correspond to a specific specification, ie if the wear A does not lie in a range between Al and A2, for example, then the machine operator is notified. It is also conceivable that for alerting a lying between AI and A2, but close to AI, upper

Limit for determining the suitability of the abrasive belt 8 is used for the final grinding cycle to ensure a certain remaining service life of the abrasive belt 8. Of course, the above considerations apply not only to the abrasive belt 8 but also to other types of abrasive media, such as grinding wheels and sanding rollers 4.

In general, it is advantageous if the contact between the metal strip 1 and the

Grinding medium 4 takes place on a line, as shown in Figures 1 and 2. Instead of grinding rollers 4 or grinding wheels, grinding belts 8 can also be used for this, which contact the belt surface along a line (see also FIGS. 8 and 9). As a result of the line contact, the metal strip 1 can be removed in a particularly targeted manner at relatively low grinding pressure.

It is also advantageous if the contact between the metal strip 1 and the grinding medium 8 takes place on a surface, as shown in FIGS. 3 and 4. As a result, the strip surface can be homogenized or equalized particularly well. FIGS. 6 and 7 now show a further arrangement for grinding a metal strip 1 (FIG. 6 side view, FIG. 7 top view). This includes both an abrasive roller 4 for transverse grinding of the metal strip 1 and a belt grinder 6..8 for longitudinal grinding of the metal strip 1. The comments made to the figures 1 to 4 thus applies mutatis mutandis to the device shown in Figures 6 and 7. With the device shown, the metal strip can thus be ground transversely and longitudinally. In the illustrated configuration, the transverse grinding takes place before the longitudinal grinding. In principle, however, it is also possible first to grind the metal strip 1 longitudinally and then transversely. Another feature of the method illustrated with the aid of FIGS. 6 and 7 is that the longitudinal grinding takes place over the entire bandwidth. As a result, a particularly flat surface can be produced on the metal strip 1. Furthermore, the transverse grinding in FIGS. 6 and 7 takes place in a region reduced in size over the entire bandwidth, which is denoted by "E". As a result, the grinding region could be concentrated, for example, on a weld extending in the longitudinal direction of the metal strip, whereby regions of the transverse weld which are further away from the weld remain unaffected. By such a weld comparatively wide metal bands 1 can be produced. In principle, however, it is also conceivable that the longitudinal grinding does not take place over the entire bandwidth and / or the transverse grinding over the entire bandwidth (see also FIGS. 8 and 9).

A further feature of the method illustrated with the aid of FIGS. 6 and 7 is that a wider abrasive medium 8 is used for longitudinal grinding than for transverse grinding. As a result, in transverse grinding, a relatively high removal rate can be achieved with a comparatively low grinding pressure, whereas the surface of the metal strip 1 is smoothed out during longitudinal grinding by the wide abrasive belt 8 (see also FIGS. 8 and 9). In principle, the transverse grinding and longitudinal grinding can take place at positions offset in the longitudinal direction of the metal strip 1 at the same time. In FIGS. 6 and 7, the sanding roller 4 and the sanding belt 8 are activated simultaneously. By this procedure, the metal strip 1 can be made very fast. It is also conceivable, however, that the transverse grinding and longitudinal grinding take place one behind the other, that is, that the grinding roller 4 and the grinding belt 8 are not active simultaneously. The decoupling of transverse loops and longitudinal loops can have a specific influence on the grinding result. In addition, there is also the basic possibility to use only a single grinding device for the transverse grinding and the longitudinal grinding, which is rotated in each case by 90 ° (see also Figs. 8 and 9). This is favored by the fact that the grinding process preferably takes place on the endless, closed band 1. FIGS. 8 and 9 now show an embodiment variant which is basically very similar to the variant shown in FIGS. 6 and 7. In contrast to this, however, a single belt grinder 5.8 is now used for longitudinal grinding and transverse grinding. Figures 8 and 9 show the device in the position for longitudinal grinding. However, in this embodiment, the belt grinding device 5..8 can be rotated through 90 ° about its vertical axis (see the double arrow in FIG. 9), whereby only a single grinding device 5..8 is required for transverse grinding and longitudinal grinding. Of course, instead of a single belt grinder 5..8 but also two separate belt grinder 5..8 may be provided which are rotated by 90 ° from each other.

With regard to the cross feed in the direction D, what has been said about FIGS. 1 and 2 applies mutatis mutandis. That is to say, the transverse feed can take place in an oscillating manner (for example triangular, sawtooth or sinusoidal) simultaneously with the longitudinal feed in the direction C or in temporal succession.

In FIGS. 8 and 9, the abrasive belt 8 contacts the metal belt 1 both during transverse grinding and during longitudinal grinding along a line. It is also conceivable, however, that for the longitudinal grinding a contact between the grinding belt 8 and metal strip 1 is provided on a surface, as already shown in FIGS. 3 and 4. This can be accomplished by providing two separate belt grinders 5..8 which are rotated 90 ° about their vertical axis, with the belt grinder 5.8 provided for transverse grinding only rests with the roller 5 (line contact) and the intended for longitudinal grinding belt grinder 5..8 as shown in Fig. 3 and 4 is arranged (surface contact). Alternatively, however, it is also conceivable that a single belt grinder 5.8 can be rotated not only by 90 ° about the vertical axis, but also about the axis of the roller 5 (here by 60 °), so that can be switched between line contact and surface contact. In the case of two separate belt sanding devices 5..8, it is also possible to use sand belts 8 of different widths for longitudinal grinding and transverse grinding. In principle, it is also conceivable to provide a surface contact between sanding belt 8 and metal strip 1, even when transverse grinding. A further feature of the method illustrated with the aid of FIGS. 8 and 9 is that the longitudinal grinding does not take place over the entire bandwidth, but the transverse grinding takes place over the entire bandwidth (see also the region E). In this context, it is pointed out that the longitudinal feed in the direction C can also be superimposed on an oscillating movement in the direction D, even during longitudinal grinding, or this can also be carried out successively.

Figures 10 and 11 show a further variant, which is similar to the variants shown so far. In contrast, however, a grinding wheel 12 is used for the transverse grinding and a grinding roller 4 for the longitudinal grinding. In this context, it is also noted that the transverse grinding and longitudinal grinding is also conceivable with a single 90 ° rotatable about its vertical axis grinding roller 4 (see Figure 8 and 9).

FIGS. 12 and 13 furthermore show a variant in which the grinding operation takes place on the open band 1. In concrete terms, the band 1 to be ground is unwound from a reel 13 and the ground band 1 is reeled onto another reel 14. In this way, the grinding process can take place even in long bands 1 in a narrow space. Of course, all previously mentioned embodiments can also be applied to the grinding on the open belt 1. Of course, a just laid (and not reeled) metal strip 1 can be ground in the specified manner.

FIGS. 14 and 15 show an example in which a belt grinder 6..8 is fastened to a gantry frame 15 which can be moved along the metal belt 1 with the aid of wheels 16 and rails 17. In this way, in particular (open) and just spread metal band 2 are processed. The comments made for the preceding example apply mutatis mutandis to this device. Of course, the portal structure is not mandatory, but the grinding of the metal strip 1 can also be performed by a Gelenkarmroboter (industrial robot) or by several such robots.

Of course, the portal frame 15 and / or articulated arm robot can also be used in connection with the processing of endless metal bands 1 respectively off / on reeled metal bands 1. A relative movement between a grinding device and The metal band 1 can then be made in particular by moving the portal frame 15 / Gelenkarmroboters and / or by moving the metal strip 1. For example, the metal strip 1 can be ground in sections by the relative movement between metal band 1 and portal frame 15 during grinding exclusively by moving the portal frame 15 and then the metal strip 1 is moved on to the next grinding section.

FIG. 15 also explicitly shows a weld seam 18, with the aid of which several parts are connected to form a metal strip 1. This can be ground longitudinally with the belt grinder 6..8. If a separate device for transverse grinding is provided on the portal frame 15 (compare, for example, FIGS. 6 and 7), provision may be made in particular for the metal strip 1 to be ground transversely in the seam region G of the weld seam 18 and thus along the weld seam 18. In this way, the weld 18 can be removed very targeted. Thereafter, a longitudinal grinding of the metal strip 1 take place. It is also conceivable, however, a transverse grinding of the weld 18 with the belt grinding 6..8 takes place when this is designed to rotate as shown in Figs. 8 and 9. Of course, similar considerations apply to a weld with which a metal band 1 is welded together to form an endless band.

It should be noted at this point that the individual grinding operations can generally be carried out in several passes. For example, the transverse grinding can be carried out in several passes and also the subsequent longitudinal grinding.

Although the manufacturing method has been explained with reference to a metal strip 1 whose

Of course, when the weld 18 is oriented in the transverse direction, the proposed method can equally be applied to longitudinal weld seams. This can also be ground first transversely and then longitudinally.

In general, it is advantageous if the final grinding pass is performed with a hard-bonded grinding medium 4, 8, 12. In this type of grinding media 4, 8, 12, the abrasive particles remain relatively long in the matrix in which they are embedded. Therefore, the rounded edges of the abrasive particles remain in effect for a long time before the abrasive particles break out and new abrasive particles with peaks and sharp edges are exposed. The Bandoberfiäche 1 is particularly homogeneous with these grinding media. in principle but is also the use of soft grinding media 4, 8, 12 conceivable. In general, the hardness of grinding media 4, 8, 12 by the letters of D = very soft until

T = very hard. The structure or structure of an abrasive medium 4, 8, 12 is determined by the distance of the

Abrasive grains indicated and expressed in numerals from 0 = very narrow to 14 = very open. In general, the grinding of the metal strip 1 can be done with open or narrow abrasive media.

For the abrasive particles are generally natural grain materials (quartz, corundum, emery, garnet, natural diamond) and synthetic grain materials (corundum, silicon carbides, chromium oxides, cubic boron nitride, diamonds) in question.

It is also particularly advantageous if the final grinding pass is performed with a single grinding medium 4, 8, 12. Advantageously, the processing time is kept short, and steps in the strip surface after a change of the grinding medium 4, 8, 12 are prevented. For example, the final grinding passage by means of the device shown in Figures 3 and 4 carried out such that a used sanding belt 8 is inserted into the belt grinder 5..7 or is already there and the metal strip 1 is once moved around, that is a circulation is performed. The sanding belt 8 is not changed.

It is also particularly advantageous if the final grinding pass is carried out with a plurality of aged or already used grinding media 4, 8, 12. In this way, the influence of the degradation of the grinding media 4, 8, 12 can be further reduced. This procedure is particularly suitable for grinding particularly large metal bands 1. For example, the final grinding passage with the aid of the device shown in Figures 3 and 4 done so that a used sanding belt 8 is inserted into the belt grinder 5..7 or already there and a part of the metal strip 1 is ground. Then, another used abrasive belt 8 is inserted, and it is another part of the metal strip 1 ground. This process is repeated until the entire strip surface has been finally ground. Advantageously, the abrasive belts used have the same or approximately the same wear A. Of course, a final grinding cycle can also be performed with a grinding roller 4 or a grinding wheel 12. The comments on the sanding belt 8 is mutatis mutandis applicable to the sanding roller 4 or a grinding wheel 12. In general, the metal strip 1 can be ground dry or wet. When dry grinding, the resulting sanding dust can be sucked off well, while wet grinding prevents the formation of sanding dust at all. In addition, the grinding medium 4, 8, 12 is kept largely free of deposits, and the processing point is cooled. For wet grinding, for example, petroleum, oil or water can be used as a lubricant.

In the examples presented so far, it has been assumed that the advancing movement between the grinding medium 4, 8, 12 and metal strip 1 is directed counter to a grinding direction. On the one hand, this achieves a high cutting speed, on the other hand, the removal of the metal strip 1, that is to say the grinding dust or the grinding sludge, is thrown or kept away from the ground surface that has already been ground. The ground surface therefore remains relatively clean.

In principle, however, it is also conceivable that a feed motion between grinding medium 4, 8, 12 and metal strip 1 is rectified to a grinding direction. On the one hand, the cutting speed is lowered, on the other hand, the removal of the metal strip 1, so the grinding dust or the grinding sludge is thrown or kept away from the not yet ground surface. Therefore, virtually no grinding dust gets to the processing point, whereby high-quality grinding results can be achieved.

The embodiments show possible embodiments of a manufacturing method for a metal strip 1, it being noted at this point that the invention is not limited to the specifically illustrated embodiments of the same / same, but rather also various combinations of the individual embodiments with each other are possible borrowed and this variation possibility due to the doctrine of technical action by objective invention in the skill of those skilled in this technical field lies. Thus, all conceivable embodiments are possible, which arise through combinations of individual details of the embodiment variant shown and described. In particular, it is also noted that the illustrated devices may in reality also comprise more or fewer components than shown and are sometimes shown in greatly simplified form in the figures.

For the sake of order, it should finally be pointed out that the illustrated devices as well as their components have also been shown partially out of scale and / or enlarged and / or reduced in size for a better understanding of their design.

The task underlying the independent inventive solutions can be taken from the description.

In general, it is also noted in this context that the grinding of the metal strip 1 in the manner specified in the embodiments and in particular in Figures 1 to 4 and 6 to 15, of course, not only with a worn abrasive medium 4, 8, 12 possible, but also with a new, unused grinding medium 4, 8, 12. Special grinding methods can thus also without the features of claim 1 form the basis for a divisional application. Alternatively or in addition to the grinding media 4, 8, 12 used in the figures, loose abrasive media, for example abrasive pastes, may also be used.

REFERENCE NUMBERS

1 metal band

role

3 roll

grinding roll

5 pulley

6 pulley

7 pulley

8 sanding belt

9 counter plate

10 sensor

11 evaluation or alarm unit

12 grinding wheel

13 reel

14 reel

15 portal frame

16 wheel

17 rail

18 weld

A wear

B grinding direction in the transverse direction

C direction of longitudinal feed

D direction of cross feed

E Grinding area for transverse grinding

F grinding direction in the longitudinal direction

G weld seam area

R roughness

Claims

Patent claims

Method for the production of a metal strip (1), in which the metal strip (1) is ground in several passes on at least one side on substantially the entire surface,

characterized in that

the metal strip (1) is ground in a final grinding pass with an aged or worn abrasive medium (4, 8, 12).

2. The method according to claim 1, characterized in that the metal strip (1) is ground in a final grinding pass with an abrasive medium (4, 8, 12) which has a minimum wear.

3. The method according to claim 1 or 2, characterized in that the metal strip (1) in a final grinding pass up to a maximum wear of the

Grinding medium (4, 8, 12) is ground.

4. The method according to any one of claims 1 to 3, characterized in that the final grinding pass is performed with a hard-bonded abrasive medium (4, 8, 12).

5. The method according to any one of claims 1 to 4, characterized in that the final grinding passage with a single grinding medium (4, 8, 12) is performed.

6. The method according to any one of claims 1 to 4, characterized in that the final grinding pass with a plurality of aged or already used grinding media (4, 8, 12) is performed.

7. The method according to any one of claims 1 to 6, characterized in that the

Metal strip (1) is cross-cut and ground longitudinally.

8. The method according to any one of claims 1 to 7, characterized in that the metal strip (1) with a grinding wheel (12) or grinding roller (4) is ground.

9. The method according to any one of claims 1 to 8, characterized in that the metal strip (1) with a grinding belt (8) is ground.

10. The method according to any one of claims 1 to 9, characterized in that the grinding medium (4, 8, 12) contacts the metal strip (1) on a line.

11. The method according to any one of claims 1 to 9, characterized in that the

Grinding medium (4, 8, 12) touches the metal strip (1) on a surface.

12. The method according to any one of claims 1 to 11, characterized in that the metal strip (1) is ground over the entire bandwidth.

13. The method according to any one of claims 1 to 11, characterized in that the metal strip (1) in a relation to the entire bandwidth reduced area (E) is ground.

14. The method according to any one of claims 1 to 13, characterized in that the

Grinding process on endless, closed metal strip (1) takes place.

15. The method according to any one of claims 1 to 13, characterized in that the grinding operation on the open metal strip (1).

16. The method according to any one of claims 1 to 15, characterized in that the metal strip (1) is ground dry.

17. The method according to any one of claims 1 to 15, characterized in that the

Metal strip (1) wet or with the aid of a lubricant is ground.

18. The method according to any one of claims 1 to 17, characterized in that a

Feed movement between the abrasive medium and metal strip (1) counter to a direction of grinding takes place.

19. The method according to any one of claims 1 to 17, characterized in that a

Feed movement between the abrasive medium and metal strip (1) is rectified to a grinding direction.

20. Metal strip (1), characterized in that it is produced by a method according to one of claims 1 to 19.

21. Device for the production of a metal strip (1), comprising two rollers (2, 3) or two reels (13, 14) for holding and moving the metal strip (1) and a grinding device (4..8, 12) for grinding the metal strip (1) in several passages at least on one side on substantially the entire surface,

marked by

Means for determining an age or wear (A) of an abrasive medium (4, 8, 12) and for issuing an alarm if an abrasive medium (4, 8, 12) does not meet a predetermined age or wear in a final grinding pass (A) corresponds.

22. The apparatus according to claim 21, characterized by a grinding wheel (12) or the grinding roller (4).

23. The apparatus according to claim 21, characterized by an abrasive belt (8).