AT517879B1 - Method and device for producing a homogeneous, ground surface of a metal strip - Google Patents

Abstract

The invention relates to a method for the production of a metal strip (1), in which the metal strip (1) is ground in multiple passes on at least one side over substantially the entire surface. In a final grinding pass, the metal strip (1) is ground in with an aged or worn abrasive medium (4, 8, 12). Furthermore, a device for the production of a metal strip (1) is provided, which comprises two rollers (2, 3) or two reels (13, 14) for holding and moving the metal strip (1), and a grinding device (4..8, 12). In addition, the device comprises means for determining an age (A) of an abrasive medium (4, 8, 12) and for issuing an alarm when an abrasive medium (4, 8, 12) in a final grinding pass not a predetermined age respectively corresponds to a predetermined wear (A).

Description

Description: The invention relates to a method for the production of a metal strip, in which the metal strip is ground in several passes on at least one side on essentially the entire surface. Likewise, the invention relates to a device for producing a metal strip, which comprises two rollers or two reels for holding and moving the metal strip, and a grinding device for grinding the metal strip in a plurality of passes at least on one side and on essentially the entire surface.

Basically, methods and devices for grinding metal strips are known from the prior art. Such metal strips are produced for certain purposes with a very high surface quality and are mostly ground or even highly 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 artificial stone (“engineered stone”). A liquid or pasty material is applied to a driven / moving belt and the at least partially solidified material is lifted off. The surface quality of the product produced with such a metal strip depends directly on the surface quality of the metal strip.

The problem here is that it is difficult to produce a sufficiently homogeneous surface of the metal strip using conventional grinding methods. Such belts sometimes have an area of several hundred square meters to be sanded. As is easy to imagine, it is difficult to achieve a homogeneous grinding pattern over the entire belt surface. As a result, the products made with this metal strip also do not have a 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 in such a way that a homogeneous strip surface is created in order to be able to meet the above requirements.

This object is achieved by a method of the type mentioned, in which the metal strip is ground in a final grinding pass (at least on one side on essentially the entire surface) with an aged or worn grinding medium. In other words, the final grinding cycle is started with an aged or worn grinding medium, or the final grinding cycle is carried out entirely with an aged or worn grinding medium.

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

Finally, the object of the invention is also achieved with a device of the type mentioned, additionally comprising means for determining an age or wear of a grinding medium and for issuing an alarm if a grinding medium is not a predetermined age or a final grinding pass corresponds to predetermined wear.

The proposed measures achieve a particularly flat and high-quality surface of the metal strip. This takes advantage of the fact that an aged or already worn grinding medium shows only a slight degradation and the grinding result is subject to only a slight change for a long time. In contrast, for a high-quality grinding result in the state of the art, mostly new and unused grinding media are used. However, this procedure leads to success or to a homogeneous grinding pattern only with relatively small surfaces to be ground. In the case of large areas, however, the wear of the grinding particles, which is particularly large with a new grinding medium, comes into play. Pointed and sharp edges / 22

AT517 879 B1 2018-02-15 Austrian

Patent office on the abrasive grains are rounded relatively quickly, but the rounded abrasive edges remain for a comparatively long time. With the same grit, a significantly more homogeneous and smooth finish can be achieved with a used grinding medium than with a new grinding medium.

The purpose of grinding can for example be to grind the metal strip to a certain thickness and / or to ensure a certain thickness uniformity and / or to produce a certain surface quality. For example, a tolerance band for the thickness of the metal band can be +/- 100 gm around a certain nominal dimension, whereas the tolerance for the thickness uniformity is only +/- 25 gm. The thickness of the metal strip should therefore be within both tolerance bands at every point. The surface quality can be defined, for example, by the surface roughness and / or the degree of gloss. The surface roughness is usually given in gm, whereby the information can denote the average roughness, square roughness or average roughness depth.

At this point it is noted that the invention relates not only to bonded abrasive media, but also to loose abrasive particles. In particular, the invention therefore also relates to grinding pastes in which grinding particles are present, for example, in aqueous or oily solution.

In the context of the invention, essentially the entire area ”denotes in particular a proportion of at least 90% of the total surface of the strip on one strip side. Smaller areas can be excluded from the processing, for example the area around a weld seam for connecting the ends of the strip in an endless strip. Of course, the method is not limited to grinding one side of the belt, but both sides of the belt can also be ground.

Further advantageous refinements and developments of the invention result from the subclaims 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 that has a minimum wear. This prevents the degradation of the grinding medium from being too great.

It is also advantageous if the metal strip is ground in a final grinding pass until the grinding medium is worn to a maximum. In this way it is ensured that the grinding medium still has a sufficiently strong removal rate or a sufficiently long remaining 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 period of use of the grinding medium. It is also conceivable that the wear is determined on the basis of the number of grinding cycles, that is to say how often an abrasive grain is in engagement with the metal belt. Another influencing factor is the cycle engagement time, i.e. the time during which an abrasive grain is in engagement with the metal belt in one cycle. A very similar influencing factor is the cycle engagement path, that is, the path length that an abrasive grain engages with the metal belt in one cycle. Finally, the contact pressure of the grinding medium on the metal belt also influences the wear of the grinding medium. For example, wear can be determined using 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 Natural grain materials (quartz, corundum, emery, garnet, etc.) are generally used for the abrasive particles. Natural diamond) and synthetic grain materials (corundum, silicon carbide, chromium oxide, cubic boron nitride, diamond).

It when the final grinding pass is carried out with a hard-bonded grinding medium is particularly advantageous. With this type of grinding media, the grinding particles remain in the matrix in which they are embedded for a comparatively long time. Therefore stay

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Patent office also effective the rounded edges of the abrasive particles long before the abrasive particles break out and new abrasive particles with points and sharp edges are exposed. The

The belt surface becomes particularly homogeneous with these grinding media. In principle, however, the use of soft grinding media is also conceivable. In general, the hardness of grinding media is indicated by the letters from D = very soft to T = very hard.

It when the final grinding pass is carried out with a single grinding medium is particularly advantageous. The processing time is advantageously kept short, and steps in the belt surface after changing the grinding medium are also prevented.

However, it is also particularly advantageous if the final grinding pass is carried out with a number 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 strips.

It is also advantageous if the metal strip is cross-ground and longitudinally ground. The cross-cut makes the belt surface particularly flat. Here, a) a first grinding device for transverse grinding of the metal strip transversely to its longitudinal direction and a second grinding device for longitudinal grinding of the metal strip in its longitudinal direction can be provided, or b) a single grinding device for transverse grinding of the metal strip transverse to its longitudinal direction and for Longitudinal grinding of the metal strip in its longitudinal direction, the single grinding device being rotatably mounted about an axis oriented transversely to the plane of the metal strip.

When cross-grinding a feed in the longitudinal direction, for example, an oscillating movement in the transverse direction can be superimposed, or the movement takes place in stages, that is to say that a feed in the longitudinal direction only takes place when the movement in the transverse direction has been carried out.

It is also advantageous if a wider grinding medium is used for the longitudinal grinding than for the transverse grinding. This enables a relatively high stock removal rate with comparatively low grinding pressure to be achieved during cross-grinding, whereas the surface of the metal strip is leveled well by the wide grinding medium during longitudinal grinding.

In an advantageous variant of the manufacturing process, cross grinding and longitudinal grinding are carried out simultaneously at points offset in the longitudinal direction of the metal strip. For example, a longitudinal grinding device is arranged in the feed direction behind a cross grinding device. This procedure enables the metal strip to be produced particularly quickly.

[0028] In another advantageous variant of the manufacturing process, cross-grinding and longitudinal grinding take place in succession. In this variant, cross grinding and longitudinal grinding are decoupled from each other, which means that the grinding result can be influenced in a very targeted manner. In addition, there is also the basic possibility of using only a single grinding device for cross-grinding and longitudinal grinding, which is rotated by 90 ° in each case.

It is expedient if the device for the production of a metal strip has a grinding wheel or grinding roller, or if the metal band is ground with a grinding wheel or grinding roller. It is also advantageous if the device for producing a metal belt has an abrasive belt, or if the metal belt is ground with an abrasive belt. The abrasive media mentioned are particularly well suited 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 belt and the grinding medium

AT517 879 B1 2018-02-15 Austrian patent office to be used for longitudinal grinding on a line. This allows the strip surface to be homogenized / leveled at a relatively low grinding pressure. In particular, grinding wheels / grinding rollers or grinding belts can be used for this purpose, which the

Touch the belt surface along a line.

It is expedient if the grinding medium touches the metal strip on a surface or if the contact between the metal strip and the grinding medium takes place on a surface during grinding. As a result, the belt surface can be homogenized or leveled particularly well. Abrasive belts that lie flat on the metal belt are particularly suitable for this purpose.

In a further advantageous variant of the manufacturing process, the metal strip is ground over the entire range. This enables a particularly flat surface of the metal strip to be produced. It is particularly advantageous if the longitudinal grinding takes place over the entire bandwidth.

It is also advantageous if the metal strip is ground in an area that is smaller than the entire bandwidth. This allows the grinding process to be carried out in a very differentiated manner. For example, comparatively high stock removal can take place in one width region of the metal strip, whereas a relatively low stock removal rate takes place in another width region.

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

It is also advantageous if the grinding process takes place on the open (= not closed) metal belt. In this way, the grinding process can also take place in the case of long belts in a narrow space, for example in that the belt to be sanded is unwound from a reel and the sanded belt is rewound onto another reel. In principle, the sanding belt can also be applied without the use of reels.

It is also advantageous if the metal strip is ground dry. In this way, the resulting grinding dust can be extracted well.

However, it is also advantageous if the metal strip is ground wet or with the aid of a lubricant. This prevents sanding dust from forming. 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. After all, the removal rate with wet grinding is usually higher than with dry grinding.

It is also advantageous if a feed movement between the grinding medium and the metal strip takes place in the opposite direction to a grinding direction. On the one hand, a high cutting speed is achieved, on the other hand, the removal of the metal strip, ie the grinding dust or the grinding sludge, is thrown away or kept away from the ground surface that has already been ground. The ground surface therefore remains comparatively clean.

However, it is also advantageous if a feed movement between the grinding medium and the metal strip takes place in the same direction as a grinding direction. On the one hand, this reduces the cutting speed, on the other hand, the removal of the metal strip, i.e. the grinding dust or the grinding sludge, is thrown away or kept away from the surface that has not yet been ground. Therefore, practically no grinding dust gets to the processing point, whereby high-quality grinding results can be achieved.

At this point it is noted that the variants disclosed for the manufacturing process and the resulting advantages equally apply to the disclosed device

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Obtain a patent office and vice versa.

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

[0042 [0043 [0044 [0045 [0046 [0047 [0048 [0049 [0050 [0051 [0052 [0053 [0054 [0055 [0056

Each show in a highly simplified, schematic representation:

Figure 1 shows a first arrangement for the production of a metal strip with a grinding roller for cross 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 a side view;

FIG. 4 shows the arrangement from FIG. 3 in plan view;

5 schematically shows 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 cross grinding and a belt grinding device for longitudinal grinding in a side view;

FIG. 7 shows the arrangement from FIG. 6 in plan view;

8 shows an arrangement with a single rotatably mounted belt grinding device in a side view;

FIG. 9 shows the arrangement from FIG. 8 in plan view;

10 shows an arrangement for the production of a metal strip with a grinding wheel for cross grinding and a grinding roller for longitudinal grinding in a side view;

FIG. 11 shows the arrangement from FIG. 10 in plan view;

12 shows an arrangement for grinding on an open metal belt with a grinding wheel and belt grinding device in a side view;

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

14 shows an arrangement for grinding on the open metal belt with the aid of a movable portal in side view and [0057 [0058

15 shows the arrangement from FIG. 14 in plan view.

To begin with, 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, and the disclosures contained in the entire description can be applied analogously to the same parts with the same reference numerals or the same component names. The location information selected in the description, e.g. above, below, laterally, etc. related to the figure described and illustrated immediately and in the case of a change of position to be transferred accordingly to the new position. Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions.

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

With the aid of the device shown, the metal strip 1 can be ground transversely to its longitudinal extent. In the specific example, the grinding roller 4 is used, whose

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Grinding direction (not the feed direction) is denoted by B. This movement is through

Rotation of the grinding roller 4 about a horizontal axis aligned along the metal strip 1 causes. The metal strip 1 is moved in the direction C with the help of the rollers 2 and 3 and thus brings about a longitudinal feed during cross-grinding.

[0061] In addition to the longitudinal feed in the direction C, during cross grinding there is also a feed in the direction D transverse to the longitudinal direction of the metal strip 1. In this way, the welding area can be ground with the grinding roller 4. For example, an oscillating movement in the transverse direction D is superimposed on the feed in the longitudinal direction C, for example with a triangular, sawtooth or sinusoidal course. The movement in direction D can also take place in stages. In this case, a feed in the longitudinal direction C takes place only when the movement in the transverse direction D has been carried out. The metal strip 1 is thus stopped during the movement in the direction D.

The cross-grinding can take place over the entire bandwidth or, for example, also be limited to an area which is smaller than the total bandwidth and which is designated by E in FIG. 2.

3 shows a further exemplary and purely schematically illustrated system for producing a metal strip 1 in a side view, and FIG. 4 in a top view. The system in turn comprises a metal belt 1, which is designed as an endless belt and is guided around two rollers 2 and 3, at least one of which is driven. 3 and 4, a belt grinding device is shown, which comprises three deflection rollers 5, 6 and 7 and an abrasive belt 8. Finally, FIG. 3 also shows a counter plate 9 for supporting the metal strip 1 (note: the sensor 10 and the electronic evaluation or alarm unit 11 are explained in the context of FIG. 5).

Instead of the counter plate 9, a support roller could also be provided, or the grinding could, in principle, also take place without a counter plate 9 or support roller. The same also applies to the system shown in FIGS. 1 and 2. The grinding can also be carried out there with a counter plate 9 or support roller.

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

In the present method, the grinding roller 4 is used for the transverse grinding of the metal strip 1, the grinding belt 8 for the longitudinal grinding. Although the abrasive media mentioned are well suited for the stated purpose, because they have a long service life and are therefore efficient and true to size Enable loops, but this is not the only way. Of course, it is also conceivable that the cross-grinding takes place with the grinding belt 8, or that the longitudinal grinding takes place with the grinding roller 4. In particular, it is generally also conceivable to use a grinding wheel instead of the grinding roller 4, the main difference to the grinding roller 4 being the larger diameter / width ratio. The grinding pressure is reduced due to the smaller contact area, which favors high removal rates.

5 schematically shows 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 (wear A0) comparatively high and decreases rapidly. With increasing wear A, the roughness R then decreases less and less. This means that at the beginning the grinding particles of the grinding medium 4, 8 have sharp tips and edges which are rounded off relatively quickly. Although these rounded edges do not allow such a high removal rate, they have a comparatively long service life or are subject to a relatively low degradation.

5 this can be seen in that the decrease in roughness R1-R0 or the degradation of the grinding medium 4, 8 is greater than that in the interval A1-A0

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Patent Office

Decrease in roughness R2-R1 or degradation in the interval A2-A1. The decrease in roughness R or the degradation is therefore non-linear. This fact is now exploited by the fact that the metal strip 1 is ground in several passes on at least one side on essentially the entire surface, the metal strip 1 in a final, complete grinding pass on at least one side on essentially the entire surface is ground with an aged or worn grinding medium 4, 8. This enables a particularly flat and high-quality surface of the metal strip 1 to be produced.

The wear of the grinding medium 4, 8 can generally be determined in various ways. For example, the wear A can be determined on the basis of the period 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 to say how often a grinding grain is in engagement with the metal strip 1. Another influencing factor is the cycle engagement time, that is to say the time period during which an abrasive grain is in engagement with the metal strip 1 in one cycle. A very similar influencing factor is the cycle engagement path, that is to say the path length that an abrasive grain engages with the metal strip 1 in one cycle. Finally, the contact pressure of the grinding medium 4, 8 on the metal strip 1 also influences 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 in a final grinding pass with an abrasive medium 4, 8, which has a minimum wear. This prevents the degradation of the grinding medium 4, 8 from being too great in the final grinding step. For example, the minimum wear can be defined by the value A1.

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

The device shown in Figures 3 and 4 includes exemplary means for determining an age or wear of the grinding belt 8 and for issuing an alarm if the grinding belt 8 does not correspond to a predetermined age or a predetermined 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 can be designed as a displacement sensor or an angle encoder or a revolution meter. The wear of the grinding belt 8 can then be specified, for example, as the product of the cycle engagement path and the number of cycles, the cycle engagement path essentially corresponding to the horizontal distance between the two rollers 5 and 6 and the number of cycles indicating the number of times a specific location of the grinding belt 8 passes through this cycle engagement path or happens. For example, the number of cycles can be determined as follows from the number of revolutions of roller 5. Number of cycles = number of revolutions of roller 5 x circumference of roller 5 / length of grinding belt 8. Of course, as stated above, the engagement force and / or a factor can be used to determine the wear of the grinding belt 8. Of course, alternatively or additionally, the cycle engagement time (that is, the time that a specific point on the grinding belt 8 needs to pass through the cycle intervention path) or simply the operating time of the grinding belt 8 can be used to determine the wear.

If the abrasive belt 8 used for the final sanding cycle does not meet a specific specification, that is to say the wear A is not in one area, for example

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Patent office between A1 and A2, then the machine operator will be notified. It is also conceivable that an upper limit lying between A1 and A2, but close to A1, for determining the suitability of the grinding belt 8 for the final grinding cycle is used to ensure a certain remaining service life of the grinding belt 8.

Of course, the above considerations apply not only to the grinding belt 8 but also to other types of grinding media, for example grinding wheels and grinding 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 is shown in FIGS. 1 and 2. Instead of grinding rollers 4 or grinding wheels, grinding belts 8 can also be used for this purpose, which touch the belt surface along a line (see also FIGS. 8 and 9). As already mentioned, the metal strip 1 can be removed in a particularly targeted manner at a relatively low grinding pressure due to the line contact.

It is also advantageous if the contact between the metal strip 1 and the grinding medium 8 takes place on a surface, as is shown in FIGS. 3 and 4. As a result, the belt surface can be homogenized or leveled 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 a grinding roller 4 for transverse grinding of the metal strip 1 and a belt grinding device 6..8 for longitudinal grinding of the metal strip 1. What has been said about FIGS. 1 to 4 therefore also applies analogously to the device shown in FIGS. 6 and 7. With the device shown, the metal strip can thus be ground across and lengthwise. In the configuration shown, cross grinding takes place before longitudinal grinding. In principle, however, it is also possible to first grind the metal strip 1 lengthways 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. This enables a particularly flat surface to be produced on the metal strip 1. Furthermore, the cross-grinding in FIGS. 6 and 7 takes place in an area which is reduced in relation to the entire bandwidth and is designated by E. As a result, the grinding area could be concentrated, for example, on a weld seam running in the longitudinal direction of the metal strip 1, as a result of which areas further away from the weld seam remain unaffected by cross-grinding. Comparatively wide metal strips 1 can be produced by such a welding. In principle, however, it is also conceivable that the longitudinal grinding does not take place over the entire bandwidth and / or the transverse grinding takes place over the entire bandwidth (see also FIGS. 8 and 9).

Another feature of the method illustrated with the aid of FIGS. 6 and 7 is that a wider grinding medium 8 is used for the longitudinal grinding than for the transverse grinding. As a result, a relatively high stock removal rate can be achieved during cross-grinding with a comparatively low grinding pressure, whereas the surface of the metal strip 1 is leveled well by the wide grinding belt 8 during longitudinal grinding (however, see also FIGS. 8 and 9).

In principle, cross-grinding and longitudinal grinding can take place simultaneously at locations offset in the longitudinal direction of the metal strip 1. In FIGS. 6 and 7, the grinding roller 4 and the grinding belt 8 are activated at the same time. The metal strip 1 can be produced particularly quickly by this procedure.

However, it is also conceivable that the cross-grinding and longitudinal grinding take place successively, that is to say that the grinding roller 4 and the grinding belt 8 are not active at the same time. By decoupling cross grinding and longitudinal grinding, the grinding result can be influenced in a targeted manner. In addition, there is also the basic possibility of using only a single grinding device for cross-grinding and longitudinal grinding, which is rotated through 90 ° in each case (see also FIGS. 8 and 9). This is favored by the fact that

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AT517 879 B1 2018-02-15 Austrian patent office the grinding process is preferably carried out on the endless, closed belt 1.

Figures 8 and 9 now show an embodiment variant which is basically very similar to the variant shown in Figures 6 and 7. In contrast to this, however, a single belt grinding device 5..8 is now used for longitudinal grinding and cross grinding. Figures 8 and 9 show the device in the position for longitudinal grinding. The belt grinding device 5..8 can, however, be rotated by 90 ° about its vertical axis in this embodiment variant (see the double arrow in FIG. 9), whereby only a single grinding device 5..8 is required for cross-grinding and longitudinal grinding. Of course, instead of a single belt grinder 5..8, two separate belt grinders 5..8 can also be provided, which are rotated 90 ° relative to one another.

With regard to the transverse feed in direction D, what has been said about FIGS. 1 and 2 applies analogously. This means that the cross feed can be oscillating (e.g. triangular, sawtooth or sinusoidal) at the same time as the longitudinal feed in direction C, or one after the other.

In FIGS. 8 and 9, the grinding belt 8 touches the metal belt 1 both during cross-grinding and during longitudinal grinding along a line. However, it is also conceivable that a contact between the grinding belt 8 and the metal belt 1 is provided on one surface for the longitudinal grinding, as is also already shown in FIGS. 3 and 4. This can be accomplished by providing two separate belt grinders 5..8 which are rotated by 90 ° about their vertical axis, the belt grinder 5..8 provided for cross-grinding resting only on the roller 5 (line contact) and the Belt grinding device 5..8 intended for longitudinal grinding as arranged in FIGS. 3 and 4 (surface contact). Alternatively, however, it is also conceivable that a single belt grinding device 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 it is possible to switch between line contact and surface contact. With two separate belt grinding devices 5..8 there is also the possibility of using grinding belts 8 of different widths for longitudinal grinding and cross grinding. In principle, it is also conceivable to provide surface contact between the grinding belt 8 and the metal belt 1 even in cross-grinding.

Another 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 area E). In this context, it is pointed out that an oscillating movement in direction D can be superimposed on the longitudinal feed in direction C, even during longitudinal grinding, or that these can also be carried out in succession.

Figures 10 and 11 show a further variant, which is similar to the variants previously shown. In contrast to this, however, a grinding wheel 12 is used for cross-grinding and a grinding roller 4 for longitudinal grinding. In this context, it is also noted that cross-grinding and longitudinal grinding is also conceivable with a single grinding roller 4 which can be rotated 90 ° about its vertical axis (compare FIGS. 8 and 9).

Figures 12 and 13 also show a variant in which the grinding process takes place on the open belt 1. Specifically, the belt 1 to be sanded is unwound from a reel 13 and the sanded belt 1 is rewound onto another reel 14. In this way, the grinding process can take place in a narrow space even with long belts 1. Of course, all of the previously mentioned design variants can also be applied to grinding on the open belt 1. Of course, a metal strip 1 which has just been placed (and not wound up) can also be ground in the manner indicated.

FIGS. 14 and 15 show an example in which a belt grinding device 6..8 is attached to a portal frame 15, which can be moved along the metal belt 1 with the aid of wheels 16 and rails 17. In this way, an (open) and

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Patent office just expanded metal strip 2 are processed. That for the previous example

The same applies analogously to this device. Of course, the portal structure is not mandatory, but the grinding of the metal strip 1 can also be carried out by an articulated arm robot (industrial robot) or by several such robots.

Of course, the portal frame 15 and / or articulated arm robots can also be used in connection with the processing of endless metal strips 1 or metal strips 1 that have been coiled / uncoiled. A relative movement between a grinding device and the metal strip 1 can then take place in particular by moving the portal frame 15 / articulated arm robot and / or by moving the metal strip 1. For example, the metal strip 1 can be ground in sections by the relative movement between the metal strip 1 and the portal frame 15 during grinding being carried out exclusively by moving the portal frame 15 and then moving the metal strip 1 to the next grinding section.

15, a weld 18 is also shown explicitly, with the aid of which several parts are connected to form a metal strip 1. This can be sanded lengthways with the belt grinder 6..8. If a separate device for cross-grinding is provided on the portal frame 15 (compare, for example, FIGS. 6 and 7), it can in particular be provided that the metal strip 1 in the seam region G of the weld seam 18 is ground transversely and thus along the weld seam 18. In this way, the weld seam 18 can be removed in a very targeted manner. A longitudinal grinding of the metal strip 1 can then be carried out. However, cross-grinding of the weld seam 18 with the belt grinding device 6..8 is also conceivable if it is designed to be rotatable as in FIGS. 8 and 9. Similar considerations naturally also apply to a weld seam with which a metal strip 1 is welded together to form an endless strip.

At this point it is noted that the individual grinding operations can generally be carried out in several passes. For example, cross grinding can be carried out in several passes and also the subsequent longitudinal grinding.

[0096] Although the manufacturing method was explained with reference to a metal strip 1, the weld seam 18 of which is oriented in the transverse direction, the method presented can of course equally be applied to longitudinal weld seams. This can also be sanded crosswise and then lengthways.

In general, it is advantageous if the final grinding pass is carried out with a hard-bonded grinding medium 4, 8, 12. With this type of grinding media 4, 8, 12, the grinding particles remain in the matrix for a comparatively long time in which they are embedded. Therefore, the rounded edges of the abrasive particles remain effective for a long time before the abrasive particles break out and new abrasive particles with points and sharp edges are exposed. The belt surface 1 becomes particularly homogeneous with these grinding media. In principle, however, the use of soft grinding media 4, 8, 12 is also conceivable. In general, the hardness of grinding media 4, 8, 12 is indicated by the letters from D = very soft to T = very hard.

The structure or structure of an abrasive medium 4, 8, 12 is indicated by the distance between the abrasive grains and expressed in numbers from 0 = very narrow to 14 = very open. In general, the metal strip 1 can be ground with open or narrow grinding media.

Natural grinding materials (quartz, corundum, emery, garnet, natural diamond) and synthetic grain materials (corundum, silicon carbides, chromium oxides, cubic boron nitride, diamonds) are generally suitable for the grinding particles.

It is also particularly advantageous if the final grinding pass is carried out with a single grinding medium 4, 8, 12. The processing time is advantageously kept short, and steps in the belt surface after changing the grinding medium 4, 8, 12 are prevented. For example, the final grinding pass can be carried out with the aid of the device shown in FIGS. 3 and 4 in such a way that a used grinding belt 8 is inserted into the belt grinding device 5..7 or is already there and the metal belt 1 is moved all around once, that is to say one Circulation is running. The

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Grinding belt 8 is not changed.

It is also particularly advantageous if the final grinding pass is carried out with several 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 belts 1. For example, the final grinding pass can be carried out with the aid of the device shown in FIGS. 3 and 4 in such a way that a used grinding belt 8 is or has already been inserted into the belt grinding device 5..7 is located there and part of the metal strip 1 is ground. Another used grinding belt 8 is then inserted, and another part of the metal belt 1 is ground. This process is repeated until the entire belt surface has been sanded. The abrasive belts used advantageously have the same or approximately the same wear A.

[00102] Of course, a final grinding step can also be carried out with a grinding roller 4 or a grinding wheel 12. What has been said about the grinding belt 8 can also be applied analogously to the grinding roller 4 or a grinding wheel 12.

In general, the metal strip 1 can be sanded dry or wet. With dry grinding, the resulting grinding dust can be extracted well, with wet grinding, the generation of grinding dust is prevented 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 was assumed that the feed movement between grinding medium 4, 8, 12 and metal strip 1 is opposite to a grinding direction. On the one hand, this results in 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 away or kept away from the ground surface that has already been ground. The ground surface therefore remains comparatively clean.

In principle, however, it is also conceivable that a feed movement between grinding medium 4, 8, 12 and metal strip 1 takes place in the same direction as a grinding direction. On the one hand, this reduces the 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 away or kept away from the surface that has not yet been ground. Therefore, practically no grinding dust gets to the processing point, whereby high-quality grinding results can be achieved.

The exemplary embodiments show possible design variants of a production method for a metal strip 1, it being noted at this point that the invention is not restricted to the specially illustrated design variants of the same / the same, but rather various combinations of the individual design variants with one another are also possible Possibility of variation due to the teaching of technical action through the subject invention lies in the ability of the person skilled in this technical field. Thus, all conceivable design variants are also possible, which result from combinations of individual details of the design variant shown and described.

In particular, it is also stated that the devices shown can in reality also comprise more or fewer components than shown and are sometimes shown in a greatly simplified manner in the figures.

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

[00109] The task on which the independent inventive solutions are based can be found in the description.

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LIST OF REFERENCE NUMBERS

A B

C

D

e

F

G

R

A B

C

D

e

F

G

R

metal band

role

role

grinding roll

idler pulley

idler pulley

idler pulley

sanding belt

counterplate

sensor

Evaluation or alarm unit

grinding wheel

reel

reel

portal frame

wheel

rail

Weld

wear

Cross direction of grinding

Direction of longitudinal feed

Direction of cross feed

Grinding area for cross grinding

Longitudinal grinding direction

weld area

roughness

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Claims (22)

claims 1. A 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 essentially the entire surface, characterized in that the metal strip (1) in a final grinding pass with a aged or worn grinding medium (4, 8, 12) is ground. 2. The method according to claim 1, characterized in that the metal strip (1) is ground in a final grinding pass with a grinding 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) is ground in a final grinding pass to a maximum wear of the grinding medium (4, 8, 12). 4. The method according to any one of claims 1 to 3, characterized in that the final grinding pass is carried out with a hard-bonded grinding medium (4, 8, 12). 5. The method according to any one of claims 1 to 4, characterized in that the final grinding pass is carried out with a single grinding medium (4, 8, 12). 6. The method according to any one of claims 1 to 4, characterized in that the final grinding pass with several aged or already used grinding media (4, 8, 12) is carried out. 7. The method according to any one of claims 1 to 6, characterized in that the metal strip (1) is cross-ground and longitudinally ground. 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 belt (1) is ground with an abrasive belt (8). 10. 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 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 one 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 range. 13. The method according to any one of claims 1 to 11, characterized in that the metal strip (1) is ground in an area (E) which is smaller than the entire bandwidth. 14. The method according to any one of claims 1 to 13, characterized in that the grinding process takes place on the endless, closed metal strip (1). 15. The method according to any one of claims 1 to 13, characterized in that the grinding process takes place on the open metal belt (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) is ground wet or with the aid of a lubricant. 13/22 AT517 879 B1 2018-02-15 Austrian patent office 18. The method according to any one of claims 1 to 17, characterized in that a feed movement between the grinding medium and metal strip (1) takes place in the opposite direction to a grinding direction. 19. The method according to any one of claims 1 to 17, characterized in that a feed movement between the grinding medium and metal strip (1) takes place in the same direction as a grinding direction. 20. Device for manufacturing 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 of the metal strip (1) in several passes on at least one side over substantially the entire surface, characterized by Means for determining an age or wear (A) of a grinding medium (4, 8, 12) and for issuing an alarm if a grinding medium (4, 8, 12) does not reach a predetermined age or a predetermined wear in a final grinding pass (A ) corresponds. 21. The apparatus according to claim 20, characterized in that a grinding wheel (12) or grinding roller (4) is provided as the grinding medium. 22. The apparatus according to claim 20, characterized in that a grinding belt (8) is provided as the grinding medium.