EP3027360B1 - Device and method for polishing metal strips - Google Patents

Description

The invention relates to a device for polishing a metal surface of a metal strip according to the preamble of claim 1.

Furthermore, the invention relates to a method for polishing a metal surface of a metal strip.

The term "metal surface" is understood in this document to mean an unpainted metal surface, for example of steel. For polishing such a surface of a metal strip usually a polishing cloth is stretched over a polishing plate and soaked with a polishing agent and then passed over the metal surface with moderate pressure with rotating or eccentrically moving polishing plate.

A device of the type mentioned is from the EP 2 159 004 A1 known.

A disadvantage of the known solutions, however, is that the contact pressure in the direction of the workpiece, especially when polishing by means of a hand tool for polishing is very difficult to dose and depends on the individual skill of the operator. This makes it difficult to achieve a consistent, reproducible and good quality of polished metal surfaces. Also, it can come in the known solutions to a non-uniform contact of the polishing cloth on the metal surface to be polished.

It is therefore an object of the invention to overcome the disadvantages of the prior art.

This object is achieved erfingdungsgemäß with a device of the type mentioned fact that the cushion tapers conically in the direction of the turntable.

The inventive solution makes it possible by the interposition of one or more compressible foam cushion between the turntable and the polishing cloth an approximately constant pressure even with different contact forces of the device to ensure the surface to be polished. In addition, an optimal and uniform concern of the polishing cloth on the surface is achieved by the cushion of foam material. In addition, the pressure distribution on the surface to be polished is optimized.

According to a preferred embodiment of the invention it can be provided that between the turntable and the cushion, a band is arranged with elastic barbs, wherein the band is connected at its opposite side of the barbs with the turntable or the pillow is under barbs in this document also understood mushroom-like structures.

A simple assembly and rapid replacement of the foam pad can be realized that on a turntable facing the end face of the pad a first part of at least one hook and on the turntable a second, with the arranged on the turntable facing side of the pad first part corresponding Part of the at least one hook and loop fastener is arranged

A good attachment of the polishing cloth can be ensured by a first part of at least one further Velcro fastener on the polishing pad and a second part of the at least one further part arranged on the first face facing away from the turntable Velcro is arranged.

An advantageous variant of the invention is that the polishing cloth has a diameter which is greater than the sum of a diameter of the turntable facing away from the end face of the pad and a height of the pad.

According to an advantageous development, provision may be made for a band with elastic barbs to be arranged on a lateral surface of the turntable or on a section of the polishing cloth covering the lateral surface of the turntable, the band being connected to the turntable or the polishing cloth on its side opposite the barbs is

The attachment of the polishing cloth can be further improved in that on a lateral surface of the turntable and / or a lateral surface of the pad at least a first part of at least one hook and loop and at the polishing cloth at least a second, with the first on the outer surface of the turntable and / or the The lateral surface of the pad arranged part is arranged corresponding part of the at least one hook and loop fastener.

In order to secure the polishing cloth at high speeds against accidental slipping, the diameter of the polishing cloth may be greater than the sum of the diameter of the turntable side facing away from the pad, the height of the pad and a height of the turntable, wherein an edge region of the polishing cloth by a the polishing cloth and the turntable annularly encompassing holding device is pressed and fixed against the lateral surface of the turntable

An optimal concern of the face of the foam pad on the metal surface regardless of a speed and thus a very good quality of the polished surface can be achieved that the cushion has a height that is less than or equal to the maximum, normal to the height of the diameter of the pillow.

According to an advantageous embodiment of the invention, it may be provided that the height of the pad is in a range of 10-100 mm, in particular 40-60 mm or 50-60 mm, wherein the pad has a diameter of at most 250 mm.

Good properties for receiving a polishing agent and a reduction of the heat development can be achieved in that the foam of the pad is an open-cell foam.

It has been found to be particularly favorable if the foam of the pad has a compression hardness of between 2 and 40, in particular between 5 and 20.

1. i) Tränken des Kissens mit einem Poliermittel
2. ii) Aufsetzen der Vorrichtung auf die zu polieren Stelle der Metalloberfläche, wobei die dem Drehteller abgewandte Stirnfläche des Kissens der Metalloberfläche zugewandt ist.
3. iii) Polieren der Metalloberfläche durch Rotation des Poliertuches und Anpressen des Poliertuches gegen die Metalloberfläche.
4. iv) Spülen der polierten Stelle der Metalloberfläche..

The abovementioned object can also be achieved with a method of the type mentioned at the outset by using a device according to the invention and comprising the following steps:

1. i) soaking the pad with a polish
2. ii) placing the device on the surface to be polished of the metal surface, wherein the turntable facing away from the end face of the pad faces the metal surface.
3. iii) polishing the metal surface by rotating the polishing cloth and pressing the polishing cloth against the metal surface.
4. iv) rinsing the polished portion of the metal surface.

The method according to the invention makes it possible to ensure optimum polishing of the surface in a simple manner. The inventive method is very well suited for repairing defects of a metal strip already in use. In particular, the method according to the invention is suitable for polishing, for example high-gloss polishing, of endless steel strips, in particular stainless steel strips.

1. a) Bedecken eines Bereiches um eine zu polierende Stelle (18) der Metalloberfläche mit zumindest einer Folie und
2. b) Anbringen eines Spritzschutzes, in Form einer den zu polierende Bereich umgebenden Flüssigkeitsbarriere (20) vorgebbarer Höhe

durchgeführt werden.In order to avoid contamination of the strip surface outside the area to be polished and to ensure very rapid processing of the strip when repairing strips, in particular highly polished stainless steel strips, it may be provided that before step ii) the steps

1. a) covering a region about a point to be polished (18) of the metal surface with at least one film and
2. b) attaching a splash guard, in the form of a liquid barrier (20) of predeterminable height surrounding the area to be polished

be performed.

According to a particularly advantageous variant of the invention, provision may be made for the film to be lifted from the metal foil at edges facing away from the point to be polished in order to form the liquid barrier, and for these edges to be fixed over the metal surface.

According to another variant of the invention, it may be provided that the liquid barrier is formed by a wall of a flexible material, in particular foam, which is at least partially attached and adhered to the point to be polished.

A preferred embodiment of the invention is that the metal strip is at least partially wound into a roll before step i), so that the point to be polished comes to rest on a surface of the roll and laterally of a vertex of the roll. This embodiment has the advantage that an abutment for supporting the point to be polished is formed by the roller, so that the point to be polished needs no further support during polishing.

In order to ensure a good runoff of polishing agent and rinsing liquids, the barrier may have an opening on a region facing away from the apex of the roll, wherein a drain for liquids is provided below the opening.

A controlled liquid removal from the point to be polished is further facilitated by the fact that the film edges facing the point to be polished form the sides of a triangle, with a tip of the triangle pointing downwards.

Fig. 1

Eine Vorrichtung zum Polieren von Metallbändern in einer teilweise geschnittenen Ansicht.

Fig. 2

Einen Teil der Vorrichtung aus Fig.1 im näheren Detail.

Fig. 3

Eine Draufsicht auf ein Poliertuch der Vorrichtung aus Fig. 1.

Fig. 4

Eine Seitenansicht der Vorrichtung aus Fig. 1.

Fig. 5

Ein teilweise zu einer Rolle aufgerolltes Metallband, bei welchem eine zu polierende Stelle von einem Spritzschutz umgeben ist.

Fig. 6

Einen aus einer Folie gebildeten Spritzschutz für eine zu polierende Stelle eines Metallbandes.

The invention together with further advantages will be explained below with reference to some non-limiting embodiments, which are illustrated in the drawings. In these show schematically:

Fig. 1

A device for polishing metal strips in a partially sectioned view.

Fig. 2

Part of the device Fig.1 in more detail.

Fig. 3

A plan view of a polishing cloth of the device Fig. 1 ,

Fig. 4

A side view of the device Fig. 1 ,

Fig. 5

A partially rolled into a roll metal strip in which a point to be polished is surrounded by a splash guard.

Fig. 6

A formed from a foil splash guard for a point to be polished a metal strip.

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, the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to the new situation mutatis mutandis when a change in position. Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions.

All statements on ranges of values in objective description are to be understood as including any and all sub-ranges thereof, eg the indication 1 to 10 should be understood to include all sub-ranges, starting from the lower limit 1 and the upper limit 10 ie, all sub-regions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, eg, 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

According to Fig. 1 For example, a device 1 according to the invention for polishing a metal surface 2 of a metal strip 3 has a motor 4 and a rotary shaft 5 connected thereto. The motor 4 serves to set the rotary shaft 5 in rotation. On a side facing away from the motor 4 end of the rotary shaft 5, a turntable 6 made of a rubber-elastic material, such as rubber or hard rubber, and a polishing cloth 8 are arranged. On the turntable 6, a cushion 7 is attached from a foam. A central portion of the polishing cloth 8 is attached to a turntable 6 facing away from the end face of the pad 7. The turntable 6, the pad 7 and the polishing cloth 8 are put into rotation together by the rotary shaft 5 for polishing.

On a turntable 6 facing end face of the pad 7, a first part 9 of a hook and loop fastener and on the turntable 6, a second part 9 corresponding to the first part 9 of the hook and loop fastener is arranged. About the just mentioned Velcro the turntable 6 and the pad 7 are connected.

Instead of the two parts 9 and 10 of the hook and loop fastener, only a part can be provided. If only one part is provided, it is the part that carries the barbs. It has been found that it is sufficient for a good connection between the pad 7 and the turntable 6, when only a hook or mushroom head band is arranged between these two elements. This band is preferably connected to the turntable 6 on its rear side opposite the barb-carrying side.

To attach the polishing cloth 8, a first part 11 of another hook and loop fastener and on the polishing cloth 8, a second, corresponding to the part 11 part 12 of the other hook and loop fastener may be disposed on a turntable 6 facing away from the end face of the pad 7.

At this point, they pointed out that according to a variant of the invention can be dispensed with the hook and loop fastener formed from the parts 11 and 12.

According to FIGS. 2 and 3 For example, the polishing cloth 8 may have a diameter D which is greater than the sum of a diameter d of the end face of the pad 7 facing away from the turntable 6 and a height H of the pad 7. The end face of the pad 7 may be the same as the polishing cloth 8, have an approximately circular edge. In principle, other peripheral shapes of the polishing cloth 8, such as polygonal, rectangular or even irregular shapes, possible.

On a lateral surface of the turntable 6 and / or a lateral surface of the pad 7 parts 13, 14 of a side Velcro fastener and on the polishing cloth 8 can be arranged with the parts 13, 14 corresponding parts 15, 16 of the side Velcro. The parts 13 and 14 may be arranged, for example, like a ring around the outer surface of the turntable 6 and / or the pad 7. It is also possible that the parts 13 and 14 form a single part. The same applies to the parts 15 and 16 of the side Velcro.

According to a variant of the invention, no Velcro fastener is provided between the pad 7 and the polishing cloth 8, so that the parts 14 and 16 as well as the parts 11 and 12 can be dispensed with, whereby even with the hook and loop fastener formed by the parts 13 and 15 one of the parts 13 or 15 can be omitted. In the latter case, the remaining part, preferably the part 15, is formed by a band with barbs. Preferably, this band is arranged on the lateral surface of the turntable 6 and is directly in contact with the polishing cloth 8 with its barbs.

Regarding the Velcro closures in FIG. 1 Thus, according to an advantageous variant of the invention, the parts 9, 12, 11, 14, 16 and 13 are entirely omitted and the parts 10 and 15 can be formed by bands with barbs, the barbs preferably being from the turntable 6 face away.

Moreover, it is also possible that the diameter D of the polishing cloth 8 is greater than the sum of the diameter d, the height H and a height h of the turntable 6. As in Fig. 4 shown here, an edge region of the polishing cloth 8 can be pressed and fixed against the outer surface of the turntable 6 by a holding device 17 which surrounds the polishing cloth 8 and the turntable 6 in an annular manner. The holding device 17 may be, for example, a pressure-sensitive adhesive tape, a cable tie, etc.

According to Fig. 2 For example, the pad 7 may have a height H smaller than the diameter d. The height H can also be the same size as the diameter d of the pad 7 at its thickest point. Since the cushion 7 tapers conically in the direction of the turntable, the diameter d at the end face of the cushion 7 facing away from the turntable corresponds to the maximum diameter of the cushion 7. Due to the structure of the foam material used, it may happen that the outer surfaces of the cushion 7 are not smooth are. The height H of the pad 7 may be in a range of 10 -100 mm, especially 40-60 mm or 50-60 mm. The cushion 7 may for example have a diameter d of at most 250 mm. That is, the cushion 7 may have at its thickest point a diameter which is a maximum of 250 mm.

The foam of the pad 7 may be an open-cell foam. Furthermore, the foam may have a compression hardness of between 2 and 40, in particular between 5 and 20. The foam may be, for example, a polyurethane foam.

The device according to the invention is preferably designed as a mobile hand-held device which is pressed manually against the surface of the metal strip 3. The device is particularly suitable for polishing a metal strip 2, whose frontal ends are joined together to form an endless belt.

According to the method of the invention, the cushion is 7 in the FIGS. 1 to 4 illustrated device 1 soaked before polishing the metal surface 2 with a polishing agent. For this purpose, the pad 7 and the polishing cloth 8 mounted thereon can be immersed together in a container with polishing agent. In a subsequent step, the device 1 is placed on a in Fig. 5 designated by the reference numeral 18, to be polished point of the metal surface 2 is placed, wherein the turntable 6 facing away from the end face of the pad 7 of the metal surface 2 faces. Thereafter, the metal surface 2 is polished by rotation of the polishing cloth 8 and pressing the polishing cloth 8 against the metal surface 2. After polishing, the polished portion 18 of the metal surface 2 can be rinsed. For rinsing, for example, water can be used with one on one Hose-fitting nozzle or a spray head can be sprayed onto the polished spot to remove scum residue and abrasion from the metal surface 2.

As in Fig. 5 can be covered with a film 19 before polishing the metal strip, a region around a point to be polished 18 of the metal surface 2. The film 20 can be an adhesive film which is provided with an adhesive layer on its entire surface or in sections on a side facing the metal surface. In addition, a splash guard, in the form of a liquid barrier 20 vorgebbarer height surrounding the area to be polished can be attached. The liquid barrier 20 can be formed by a wall of a flexible material, in particular foam, which is at least partially arranged and glued around the point 18 to be polished.

Depending on the position of the spot 18 to be polished, the metal strip 3 can be wholly or partly wound up into a roll 21 prior to polishing, so that the point 18 to be polished on one surface of the roll 21 and laterally, i. below, a vertex 22 of the roller 21 comes to rest. In this case, the vertex 22 of the roller 21 is understood to mean that region of the lateral surface of the roller 21 which, in a position in which a longitudinal central axis of the roller extends substantially parallel to a substrate, is furthest removed from the substrate in the vertical direction.

The barrier 20 may have an opening 24 at a region remote from the apex 22 of the roller 21, wherein a drain 23 for liquids is provided below the opening 24. The sequence 23 can, as in Fig. 5 represented by a be formed in the direction of a downwardly inclined groove.

In order to favor a controlled flow of detergent or polishing agent in the direction of the outflow 23, the film edges to be polished, which are sides of a triangle, can form the point to be polished, a tip of the triangle pointing downwards.

As in Fig. 6 For the formation of the liquid barrier 20, the film 19 can also be lifted off at edges pointing away from the point 18 to be polished, and these edges can be fixed over the metal surface 2. For example, the raised edges may be suspended from a frame or blanket disposed over the roller 21. The lifted ones Regions of the film 20 in this case form side walls of the splash guard. At the edges to be polished 18 facing the film 20 may be glued to the metal surface 2.

For the sake of order, it should be pointed out that, for better understanding of the structure of the device according to the invention, these or their components have been shown partially unevenly and / or enlarged and / or reduced in size.

The exemplary embodiments show possible embodiments of the device according to the invention and of the method according to the invention, wherein it should be noted at this point that the invention is not limited to the specifically illustrated embodiments of the same. There are all embodiments that fall within the literal meaning of the independent claims covered by the scope.

REFERENCE NUMBERS

1

contraption

2

metal surface

3

metal band

4

engine

5

rotary shaft

6

turntable

7

pillow

8th

polishing cloth

9

First part Velcro

10

Second part Velcro

11

First part Velcro

12

Second part Velcro

13

First part Velcro

14

First part Velcro

15

Second part Velcro

16

Second part Velcro

17

holder

18

Body to be polished

19

foil

20

liquid barrier

21

role

22

vertex

23

procedure

24

opening

Claims (18)

1. A device (1) for polishing a metal surface (2) of a metal strip (3), wherein the device comprises a motor (4) and a rotary shaft (5) connected to the latter, wherein a rotary disc (6) made of a rubber-elastic material and a polishing cloth (8) are arranged on an end of the rotary shaft (5) facing away from the motor (4), wherein at least one cushion (7) made of a foamed material is fixed on the rotary disc, wherein the polishing cloth (8) is arranged at least on a front face of the at least one cushion (7) facing away from the rotary disc (6), characterised in that the cushion (7) tapers conically in the direction of the rotary disc (6).
2. The device according to claim 1, characterised in that a strip with elastic barbs is arranged between the rotary disc (6) and the cushion (7), wherein the strip, at its side lying opposite the barbs, is connected to the rotary disc (6) or the cushion (7).
3. The device according to claim 1 or 2, characterised in that a first part (9) of at least one Velcro fastener is arranged on a front face of the cushion (7) facing towards the rotary disc (6) and a second part (10) of the at least one Velcro fastener, said second part corresponding to the first part (9) arranged on the side of the cushion (7) facing towards the rotary disc (6), is arranged on the rotary disc (6).
4. The device according to any one of claims 1 to 3, characterised in that a first part (11) of at least one Velcro fastener is arranged on a front face of the cushion (7) facing away from the rotary disc (6) and a second part (12) of the at least one Velcro fastener, said second part corresponding to the first part (11) arranged on the front face facing away from the rotary disc (6), is arranged on the polishing cloth (8).
5. The device according to any one of claims 1 to 4, characterised in that the polishing cloth (8) has a diameter (D), which is greater than the sum of a diameter (d) of a front face of the cushion (7) facing away from the rotary disc (6) and a height (H) of the cushion (7).
6. The device according to claim 5, characterised in that a strip with elastic barbs is arranged on a lateral surface of the rotary disc (6) or on a portion of the polishing cloth (8) covering the lateral surface of the rotary disc (6), wherein the strip, at its side lying opposite the barbs, is connected to the rotary disc (6) or the polishing cloth (8).
7. The device according to claim 5, characterised in that at least a first part (13, 14) of at least one Velcro fastener is arranged on a lateral surface of the rotary disc (6) and/or on a lateral surface of the cushion (7) and at least a second part (15, 16) of the at least one Velcro fastener, said second part corresponding to the first part (13, 14) arranged on the lateral surface of the rotary disc (6) and/or the lateral surface of the cushion (7), is arranged on the polishing cloth (8).
8. The device according to any one of claims 5 to 7, characterised in that the diameter (D) of the polishing cloth (8) is greater than the sum of the diameter (d) of the side of the cushion (7) facing away from the rotary disc (6), the height (H) of the cushion (7) and a height (h) of the rotary disc (6), wherein an edge region of the polishing cloth (8) is pressed and fixed against the lateral surface of the rotary disc (6) by a holding device (17) engaging around the polishing cloth (8) and the rotary disc (6) in an annular manner.
9. The device according to any one of claims 1 to 8, characterised in that the cushion (7) has a height (H), which is less than or equal to the maximum diameter (d) of the cushion (7) running normal to the height (H).
10. The device according to claim 9, characterised in that the height (H) of the cushion (7) lies in a range from 10 - 100 mm, in particular 40 - 60 mm or 50 - 60 mm, wherein the cushion (7) has a diameter (d) of at most 250 mm.
11. The device according to any one of claims 1 to 10, characterised in that the foamed material of the cushion (7) is an open-pore foamed material.
12. A method for polishing a metal surface (2) of a metal strip (3), characterised in that a device (1) according to any one of claims 1 to 11 is used, and it comprises the following steps:

    i) impregnation of the cushion (7) with a polishing agent.

    ii) placing of the device (1) on a point (18) of the metal surface (2) to be polished, wherein the front face of the cushion (7) facing away from the rotary disc (6) is facing towards the metal surface (2).

    iii) polishing of the metal surface (2) by rotation of the polishing cloth (8) and pressing of the polishing cloth (8) against the metal surface (2).

    iv) rinsing of the polished point (18) of the metal surface (2).
13. The method according to claim 12, characterised in that, before step ii), it also comprises the steps:

    c) covering a region around a point (18) of the metal surface (2) to be polished with at least one film (19) and

    d) application of a spray protection, in the form of a liquid barrier (20) of predetermined height which surrounds the region to be polished.
14. The method according to claim 13, characterised in that, for the formation of the liquid barrier (20), the film (19) is lifted from the metal surface (2) at edges pointing away from the point (18) to be polished and these edges are fixed over the metal surface (2).
15. The method according to claim 14, characterised in that the liquid barrier (20) is formed by a wall made of a flexible material, in particular foamed material, which is applied and glued fast at least partially around the point (18) to be polished.
16. The method according to any one of claims 11 to 15, characterised in that the metal strip (3) is at least partially rolled up to form a roll (21) before step ii), so that the point (18) to be polished lies on a surface of the roll (21) and to the side of a crown (22) of the roll (21).
17. The method according to claim 16 and any one of claims 13 to 15, characterised in that the barrier (20) comprises an opening (24) at a region facing away from the crown (12) of the roll (21), wherein a drain (23) for liquids is arranged beneath the opening (24).
18. The method according to any one of claims 12 to 17, characterised in that film edges facing towards the point (18) to be polished form the sides of a triangle, wherein an apex of the triangle points downwards.

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