EP4110552B1 - Polishing tool - Google Patents

Description

The invention relates to a polishing tool, in particular for rotational drive by a machine tool, in particular a hand-held machine, about a rotation axis, with a carrier body and a polishing body attached to the carrier body, wherein the polishing body comprises a number of lamellae.

Polishing involves the fine processing of surfaces using a polishing tool that is moved relative to the workpiece. The energy input via the relative movement and the contact pressure means that the surface of a workpiece, particularly a metal one, is processed without any significant change in the workpiece contour by leveling the surface roughness, removing any contamination and, to a lesser extent, removing material from roughness peaks on the workpiece surface. A polishing agent is usually used that consists of unbound mineral powder, usually metal oxides with a high melting point and a low tendency to dissolve in water or oil. The mineral powder forms particles with a geometrically undetermined shape. For polishing purposes, the mineral powder is slurried or processed into polishing pastes or polishing agent suspensions by mixing it with heat-resistant fats or paraffins. The particles transfer the pressure of the tool from the particles to the workpiece surface at specific points via the very small contact area, leading to local and short-term flow processes that reduce the surface roughness.

For decorative or technical surface finishing, hand-held machines with polishing tools are usually used that do not have a workpiece-specific contour and are not intended for shaping the workpiece. Rather, polishing is usually used to rework the surface for decorative purposes or to restore such a surface in a repair shop (e.g. polishing painted parts, polishing out scratches), or for technical reasons, e.g. in mold making. Hand-held machines that come into consideration here are hand drills, angle grinders or straight grinders.

In particular, so-called buffing discs or buffing bells are known for use on vehicle bodies before and after painting, in which the polishing body of the polishing tool consists of a package of cotton cloths placed on top of each other and quilted together according to the desired strength. which are arranged radially to a bore of a clamping pin or to such a clamping pin.

The main advantage of such buffing wheels is the even lower transfer of the tool contour to the workpiece, so that even with highly sensitive surfaces, e.g. piano lacquer, the formation of marks can be largely ruled out. The disadvantage is the relatively low performance.

Out of US 3,191,208 A Various buffing wheels are known in which the hardness of the wheel is sometimes increased by folding the cotton cloth and in which, instead of a receiving opening for a mandrel, a metal claw cup is provided, onto whose claws, which are arranged radially around a fastening opening for connection to a mandrel of a machine, the cloth package is impaled with or without additional sewing or quilting. The claws are longer than the cloth package is thick, so that the ends of the claws can be flanged after the cloth package has been impaled in order to fix the cloth package axially.

From the WO 2002/018102 A1 With reference to the earlier state of the art, solid felt polishing discs are known as felt polishing bodies, which can be used with mandrels to attach the felt polishing discs to machines. A number of contoured felt polishing bodies are also known, ranging from small spherical shapes of felt to various partially conical designs to cylindrical solid felt polishing bodies. These felt polishing bodies are also provided with shafts for mounting in standard drill chucks.

From the WO 89/00092 a polishing wheel made of a fiber material and the use of such a polishing wheel for polishing watch cases is known. A relatively narrow polishing wheel is described, for which it is stated as a special feature that it consists of a single solid fiber material, with the wheel being cut transversely from the outer circumference towards the center. Three radial zones are formed in the wheel. The outer zone has a large number of such cuts. Only every second of the cuts continues into the radially inner zone. The radially innermost zone has no such cuts. Furthermore, it is stated as particularly preferred that these cuts do not run exactly radially, but are curved against the direction of rotation and the tangents of the curved cut are offset by a Angle α are inclined, with the angle α increasing from the outside to the inside. In connection with one exemplary embodiment, an inclination of 20° is given as the preferred value for the angle α. The inclination is such that the tangents point past the core of the disk in the direction of rotation, i.e. the slotted radially outer parts of the polishing disk are pressed together by the inertia during rotation and thus make the polishing disk particularly hard in the radial direction. The slotting is intended to enable improved lateral (axial) mobility of the disk. Furthermore, it is particularly preferred to use a relatively hard felt for the polishing disk. The result is a polishing disk that is very hard in the radial direction, but relatively flexible in the axial direction. The workpiece is machined using the radially outer circumference of the tool.

When grinding, i.e. machining the surface of workpieces using a tool with a geometrically undefined cutting edge, abrasives in the form of abrasive grains are used that are bonded to the tool. Depending on the flexibility of the grinding tool, the tool contour is transferred to the workpiece to a greater or lesser extent when the workpiece surface is machined.

In grinding tools with bonded grain, also known as bonded abrasives, the abrasive grains are embedded in a synthetic resin mass. These grinding tools are used in the form of grinding stones and grinding wheels for shaping and surface finishing of workpieces. Such grinding tools are rigid, which on the one hand makes it easier to create a surface contour, but brings with it the problem that abrasive grains can break off uncontrollably and in larger fractions, thus leading to an uneven grinding pattern on the surface of the workpiece.

In contrast to this, there are abrasives on a backing. These are described in detail in DIN ISO 16057. Paper, fabric, polyester and fiber (vulcanized fiber) can be used as the carrier material for abrasives on a backing. These carrier materials enable the production of grinding tools with a uniform coating of abrasive grains of various grain sizes and abrasives. The abrasive grains are fixed to the carrier material with a synthetic resin bond. Since the carrier material of the abrasives on a backing is flexible, such abrasives are also referred to as flexible abrasives. For the use of such For grinding tools in sheet form, a supporting support part is required for use when grinding with machines, usually in the form of a so-called backing plate, as standardized in DIN ISO 15636. To improve the grinding performance and the tool life, it is known to arrange sections of carrier fabric with abrasive material in a plastic bond in the form of lamellas. Such a tool, also known in practice as a fan grinder, is used, for example, in the DE 79 03 893 U1 described.

In the EP 1 093 885 A1 It is stated that from the EP 922 535 A1 a similar disc grinding tool is known in which elastic intermediate elements are arranged between the individual grinding lamellas. Furthermore, for example, from the US$4,517,773 A grinding tool is known in which the grinding lamellae are not designed to protrude vertically from a plate-shaped base body, but are arranged radially from a cylinder that is driven to rotate about its longitudinal axis. Here, the individual grinding lamellae or bundles of grinding lamellae can be stiffened on one side by a support blade to prevent the grinding lamellae from deflecting too much. These support blades are designed to be flexible, but stiffer than the actual grinding lamellae. There are gaps between the individual grinding lamellae or bundles of grinding lamellae, which is said to lead to an irregular grinding pattern, especially when processing soft materials such as wood.

In the EP 1 093 885 A1 A disc grinding tool is proposed with grinding lamellae arranged radially with respect to the grinding tool axis, perpendicular to the tool body. In order to ensure a constant distance between the individual grinding lamellae, two intermediate elements are arranged between the grinding lamellae. The first intermediate element should consist of a pressure-elastic material and should come into contact with the side of the lamella that is not coated with abrasive. A further intermediate element is arranged between this intermediate element and the side of the lamella that is coated with abrasive. This intermediate element is preferably made of a plastic and has good bending properties, but has a higher wear resistance than the first intermediate element. This arrangement is intended to improve the wear behavior of the intermediate elements during operation of the grinding tool.

From the WO 2005/087436 A1 and EP 1 684 945 B1 is a flap grinding tool known with a sequence of overlapping flaps, the abrasive grains , these lamellae being formed alternately from abrasive lamellae and compressible lamellae. Each abrasive lamellae should rest with its operative part on a compressible lamellae and be supported by the compressible lamellae. The lamellae should also be able to be combined to form groups of lamellae of the type in question.

In the WO 2015/085211 A1 describes a coated abrasive material with a backing comprising a web or fleece made of a polyester-based material, impregnated with a phenolic resin, an acrylic resin, a urethane resin or a combination thereof, with an abrasive layer covering the backing containing abrasive particles. From the US 4,275,529 A A lamellar grinding tool is known in which grinding lamellas are bundled into packages and intermediate layers of abrasive fleece are arranged between adjacent grinding lamella packages. Lamellar grinding tools with consecutive lamellas made of abrasive fleece and abrasive cloth are available from SKDS sro, Lužany u Přeštic, CZ, on the SKDS.cz website under the name "Lamelové kombinované kotouče s upínací stopkou", type designation BKC, in the various abrasive combinations corundum/corundum, corundum/zirconium, carbide/corundum.

From the US$6,582,289 and the WO 00/30809 A1 A flap disc is known with first lamellae made of a base, a base bonding layer applied to the base, a scattering layer of abrasive grain applied to the base bonding layer and a cover layer applied to the scattering layer of abrasive grain, and second lamellae consisting of a base and a layer of grinding-active substances applied to the base. Potassium fluoroborate, cryolite, calcium fluoride and chiolite are proposed as grinding-active substances. This type of design should make it possible to produce a flap disc with reduced manufacturing and material costs.

From the US 5,752,876 A A flap grinding wheel is known in which the flaps are arranged in a shingle-like overlapping manner on the grinding plate. The flaps are made of cotton or polyester fabric, to which abrasive particles are bound using phenolic resin. The proposed arrangement is intended to result in worn abrasive particles breaking off at the wear edges of the flaps and the then exposed, relatively flexible carrier fabric quickly wearing away, thus exposing fresh abrasive grains, with which the grinding process can be continued continuously. This is intended to prevent grinding marks caused by setting the tool down and New preparation after replacing a worn or clogged grinding wheel can be reduced. Alternatively, it is suggested that the carrier fabric be replaced with a fleece material onto which the mixture of resin and grinding particles is applied. It is also suggested that grinding particles be embedded in the resin matrix of a grinding disc made of glass fiber reinforced plastic.

From the US 3,529,385 A A polishing brush is known which consists of strips of a nonwoven material, wherein the number of strips increases from the center of the carrier disk to the radially outer edge, so that the density of the strips is uniform or can also be set higher at the radially outer edge.

Out of DE 199 30 373 A1 A porous polishing tool and a method for polishing a roller are known, which are said to make it possible to polish a roller within a satisfactory dimensional accuracy while avoiding feed marks and striped printing effects when the polished roller is to be used for printing.

Out of DE 198 43 267 A1 A polishing disc is known which has a short fiber pile layer with a strong bond to a holding layer, and in which a Velcro layer is attached to the back of the polishing disc in order to removably attach the polishing disc to a corresponding polishing plate. The advantage stated is that it is possible to remove the polishing disc from the polishing plate and wash it in household or industrial washing machines, thereby removing dried polishing agent and polishing dust. This is intended to ensure that the polishing disc can be used several times.

From the WO 2002/018102 A1 and the US$7,794,309 A lamellar polishing tool is known in which the polishing body is divided into multiple parts, thereby forming a number of lamellae. For certain applications and use on stationary machines in series processing, it is further proposed to provide lamellae made of polishing felt of different densities. It is also disclosed there to provide one or more intermediate layers between at least some of the felt lamellae to stiffen the tool. For the efficient processing of largely flat surfaces using an angle grinder, it is proposed to use a disk as a carrier body and to arrange the felt lamellae radially projecting on the axial face of the disk. With such an embodiment, inner edge areas can also be polished particularly well.

For use with the known polishing tools described above, it is necessary to select a suitable polishing paste that matches the hardness of the felt material and its porosity. The type of grease or oil used is particularly important in order to avoid premature clogging of the polishing tool. Such premature clogging leads to streaks and smears on the workpiece and, in extreme cases, can lead to burn marks.

This problem is to be avoided with the polishing wheels described in the utility model DE-GM 1 940 005, in which an adapted polishing agent is to be integrated in a soft bond. To do this, the textile is to be soaked in the polishing agent preparation or such a preparation is to be embedded, for example, by wrapping it in pieces of cloth. It is emphasized that the cloth-like character of such a polishing wheel is to be retained, as is the case with the known polishing wheels made up of flat or puffed-up cloth layers.

As with other polishing wheels, the operator must maintain an appropriate contact pressure in order to achieve the desired polishing effect and to avoid overheating. Such overheating can lead to burn marks on the workpiece or to carbonization of the polishing felt, which in turn can lead to scratches on the workpiece when the polishing tool is used in the future.

The polishing result therefore depends on a certain amount of experience and practice on the part of the operator as well as his experience in selecting a suitable polishing body with the appropriate hardness and a polishing agent adapted to the material of the workpiece and the polishing body.

The state of the art therefore describes many solutions for various improvements to grinding and polishing tools. However, the proposed solutions have various disadvantages with regard to their handling, production or the economic efficiency of their application.

The invention is therefore based on the object of providing a polishing tool which has improved properties with regard to its handling and with regard to more efficient use of work.

The object is achieved according to the invention by a polishing tool of the type mentioned at the outset for rotational drive by a drive machine about a rotation axis, with a carrier body, and a polishing body attached to the carrier body, wherein the polishing body comprises a number of first lamellae and at least a number of second lamellae, wherein the first lamellae comprise a polishing felt and the second lamellae comprise a fleece, wherein the fleece is formed essentially from plastic fibers and wherein the fleece has a greater porosity than the polishing felt.

The porosity of the fleece is formed by the hollow spaces between the fibers. This means that the fleece absorbs the polishing paste that needs to be added during operation and gradually releases it as the tool is used. The fleece therefore acts as a depot for the polishing paste during operation. By forming the polishing body in the form of lamellas, the polishing agent can be better distributed over the surface of the polishing tool and the risk of the felt becoming clogged and thus smearing spots on the workpiece on the one hand or the polishing tool running dry on the workpiece on the other hand can be better avoided.

The design of a polishing tool according to the invention now makes it possible to finely grind and polish an unprocessed workpiece surface in a single operation with just one tool. Due to the depot effect of the abrasive fleece for the polishing agent, in many cases it is no longer necessary to interrupt the polishing process to add more polishing agent, which not only saves a considerable amount of time, but also avoids damage to the surface due to interruptions that require rework. A polishing tool according to the invention therefore enables faster and more effective fine processing of a workpiece surface for the majority of typical applications. The fine processing of workpiece surfaces can therefore be carried out much more economically with the polishing tool according to the invention than with the tools known to date.

Even if a highly polished surface, sometimes even mirror-like, is occasionally desired as a result of processing, particularly for decorative purposes, satin or matt polished surfaces are usually sufficient, particularly for technical requirements for a polished surface. With certain materials, e.g. some stainless steels, a high-gloss polish is not possible at all due to the material structure. With a polishing tool according to the invention Finely satin-finished and matt-polished surfaces were produced in a single operation with the shortest processing time. This refers to surfaces on which a standard business card, placed on the surface, is still legible due to the reflection of the surface.

For the efficient processing of largely flat surfaces with an angle grinder, it is advantageous if the carrier body is designed as a carrier disk. The carrier disk can preferably be made as a resin-bonded glass fiber disk or essentially from a plastic, preferably a fiber-reinforced plastic, from aluminum, a hard paper (fiber material), a composite material or from steel.

The lamellae are preferably arranged along the circumference of the carrier disk, preferably projecting radially beyond it, on the axial front side of the disk. With such an embodiment, inner edge areas can also be polished particularly well.

For a particularly high performance, it is advantageous if the first and second lamellae are aligned essentially parallel to the axis of rotation. Such a polishing tool according to the invention can also be applied over the entire surface for polishing, corresponding to an angle of attack of 0°.

For certain applications, e.g. in the case of strong curvature or other contouring of the workpiece, it can be advantageous if the first and second lamellae are arranged at an angle to the axis of rotation and the carrier disk, preferably projecting radially beyond the edge of the carrier disk.

For good removal performance, e.g. when burrs are to be removed during fine machining, it is advisable for the second lamellae to comprise a fleece with abrasives bound to fibres. For a good working result, a grain size of at least 320 is preferable, corresponding to a particle size of less than 50 µm.

For the processing of surfaces that are rather dirty, it can be advantageous if the second lamellae comprise a fleece without fibre-bound abrasives. For low required grinding performance, it can be advantageous if the material of the plastic fibers consists of a plastic filled with an aluminum silicate powder.

For special applications, it can also be advantageous if the polishing body further comprises a number of third lamellae, the second and third lamellae each comprising a fleece with and without abrasives bound to fibers. In this way, the advantages of fleece lamellae with and without abrasives can be combined, while at the same time a particularly flexible polishing tool for strongly contoured surfaces can be obtained.

Depending on the desired hardness of the polishing tool, it may be advantageous if the polishing body has first and second lamellae in a ratio of 1:1, 1:2 or 1:3.

In a particularly economical design of a polishing tool according to the invention for series production, the second fleece lamellae are at least partially filled with a polishing paste. The polishing paste is located in the cavities between the fibers of the fleece. This creates a polishing agent reservoir from which polishing agent is continuously released during the processing process. The amount of polishing agent can be adjusted via the thickness and density of the fleece so that the polishing agent reservoir in the fleece lamellae is sufficient for the service life of the tool. The user of the tool is therefore not concerned with questions of selecting the right polishing agent and adding appropriate amounts of polishing agent. Such a tool is particularly suitable for the repeated processing of larger areas, even by semi-skilled personnel.

It is particularly advantageous if the polishing body of the polishing tool is provided with a covering until it is used, which prevents the polishing agent from drying out. The covering can be in the form of a film or in the form of a wax covering, for example. The covering is usually removed by the user before the tool is used. The covering can also be formed by a - possibly reusable - packaging for one or more of the polishing tools according to the invention.

Fig. 1:

ein erste Ausführungsform eines erfindungsgemäßen Polierwerkzeugs in Form einer Lamellenpolierscheibe mit stehenden Lamellen in perspektivischer Ansicht;

Fig. 2:

die Lamellenpolierscheibe aus Fig. 1 in Draufsicht auf die Polierseite;

Fig. 3:

ein zweite Ausführungsform eines erfindungsgemäßen Polierwerkzeugs in Form einer Lamellenpolierscheibe in perspektivischer Ansicht;

Fig. 4:

die Lamellenpolierscheibe aus Fig. 3 in Draufsicht auf die Polierseite;

Fig. 5:

ein dritte Ausführungsform eines erfindungsgemäßen Polierwerkzeugs in Form einer Lamellenpolierscheibe mit liegenden Lamellen in perspektivischer Ansicht;

Fig. 6:

die Lamellenpolierscheibe aus Fig. 5 in Draufsicht auf die Polierseite;

Fig. 7:

ein vierte Ausführungsform eines erfindungsgemäßen Polierwerkzeugs in Form einer Lamellenpolierscheibe in perspektivischer Ansicht;

Fig. 8:

die Lamellenpolierscheibe aus Fig. 7 in Draufsicht auf die Polierseite;

Fig. 9:

ein fünfte Ausführungsform eines erfindungsgemäßen Polierwerkzeugs in Form einer Lamellenpolierscheibe mit stehenden Lamellen in perspektivischer Ansicht;

Fig. 10:

die Lamellenpolierscheibe aus Fig. 9 in Draufsicht auf die Polierseite;

Fig. 11:

ein sechste Ausführungsform eines erfindungsgemäßen Polierwerkzeugs in Form einer Lamellenpolierscheibe in perspektivischer Ansicht; und

Fig. 12:

die Lamellenpolierscheibe aus Fig. 11 in Draufsicht auf die Polierseite.

The invention will be explained in more detail below with reference to embodiments shown in the accompanying drawings. They show:

Fig.1:

a first embodiment of a polishing tool according to the invention in the form of a lamellar polishing disk with standing lamellars in a perspective view;

Fig. 2:

the lamellar polishing disc made of Fig.1 top view of the polishing side;

Fig. 3:

a second embodiment of a polishing tool according to the invention in the form of a lamellar polishing disc in a perspective view;

Fig.4:

the lamellar polishing disc made of Fig.3 top view of the polishing side;

Fig.5:

a third embodiment of a polishing tool according to the invention in the form of a lamellar polishing disk with horizontal lamellae in a perspective view;

Fig.6:

the lamellar polishing disc made of Fig.5 top view of the polishing side;

Fig.7:

a fourth embodiment of a polishing tool according to the invention in the form of a lamellar polishing disc in a perspective view;

Fig.8:

the lamellar polishing disc made of Fig.7 top view of the polishing side;

Fig. 9:

a fifth embodiment of a polishing tool according to the invention in the form of a lamellar polishing disc with standing lamellars in a perspective view;

Fig. 10:

the lamellar polishing disc made of Fig.9 top view of the polishing side;

Fig. 11:

a sixth embodiment of a polishing tool according to the invention in the form of a lamellar polishing disc in perspective view; and

Fig. 12:

the lamellar polishing disc made of Fig. 11 top view of the polishing side.

The polishing tool according to the invention shown in the figures, designated overall by 1, is designed for rotational drive by a machine tool about a rotation axis 2. The polishing tool 1 has a polishing body which a number of first lamellae 3 and at least a number of second lamellae 4. The first and second lamellae 3, 4 are attached to a carrier disk 5 as a carrier body. The carrier disk 5 has a receiving surface which is rotationally symmetrical to the rotation axis 2 of the polishing tool 1 and to which the lamellae 3, 4 are attached, for example by means of a synthetic resin adhesive. The receiving surface is arranged axially on the front side of the carrier disk 5.

The first lamellae 3 are made of a polishing felt. The felt material of the first lamellae 3 can comprise conventional polishing felts, for example and preferably polishing felt with a pure wool (animal hair) content of at least about 30% and preferably a hardness of 0.14 to 0.68 (W4 to H5) according to DIN 61200. In particular, significantly less polishing residue is left on the workpiece than with other polishing materials.

The second lamellae 4 comprise a fleece, whereby the fleece is essentially made of plastic fibers. The fleece has a greater porosity than the polishing felt. Abrasive fleeces consist of plastic fibers, usually nylon, polyester or mixtures thereof. Depending on the processing, abrasive fleeces of different elasticity and strength are produced. A method for producing an abrasive fleece with abrasive material in the form of abrasive grains bonded to the fibers is known, for example, from WO 2017/072293 A1 and the US 2018/0326556 A1 The porosity of the fleece is formed by the relatively large cavities between the fibers.

As a result, the fleece absorbs the polishing paste that needs to be added during operation and gradually releases it as the tool is used. The fleece therefore acts as a depot for the polishing paste during operation. By forming the polishing body in the form of lamellas, the polishing agent can be better distributed over the surface of the polishing tool and the risk of the felt becoming clogged and thus smearing spots on the workpiece on the one hand or the polishing tool running dry on the workpiece on the other hand can be better avoided.

The design of a polishing tool according to the invention makes it possible to finely grind and polish an untreated workpiece surface in a single operation using only one tool. Due to the depot effect of the abrasive fleece for the polishing agent, in many cases it is no longer necessary to interrupt the polishing process to add more polishing agent, which not only results in considerable time savings, but also prevents any impairment of the Surface can be avoided due to interruptions that require rework. A polishing tool according to the invention therefore enables faster and more effective fine machining of a workpiece surface for the majority of typical applications. The fine machining of workpiece surfaces can therefore be carried out much more economically with the polishing tool according to the invention than with previously known tools.

Even if a highly polished surface, sometimes even a mirror finish, is occasionally desired as a result of processing, particularly for decorative purposes, satin or matt polished surfaces are usually sufficient, particularly when there are technical requirements for a polished surface. For certain materials, e.g. some stainless steels, a high-gloss polish is not possible at all due to the material structure. Using a polishing tool according to the invention, extremely finely satin and matt polished surfaces were produced in a single operation with the shortest processing time. This refers to surfaces on which a conventionally designed business card, placed on the surface, is still legible thanks to the reflection of the surface.

The carrier disk 5 can be made as a resin-bonded glass fiber plate or from a plastic, preferably a fiber-reinforced plastic, from aluminum, a hard paper (fiber material) or from steel. The carrier disk 5 is expediently designed to be cranked as shown in the figures. This allows the working distance between the drive machine and the workpiece surface to be increased for strongly contoured workpieces, and on the other hand such a stiffer design of the carrier disk 5 counteracts fluttering of the polishing tool 1.

The Figures 3, 4 , 7, 8 , 11 and 12 The embodiments of a polishing tool 1 according to the invention shown have a carrier disk 5 with a hole 6 for receiving a conventional mandrel for connection to a drive machine. When the carrier disk 5 is manufactured from a fiber-reinforced plastic, the edge of the hole 6 is expediently reinforced with a metal eyelet 7 in order to guarantee a secure, central fit. A diameter of the hole 6 of 22.23 mm is suitable for many angle grinders.

In conjunction with common hand tools, such as angle grinders, it is advantageous for a quick and easy tool change to have a central A driver element 8 is to be provided in the area of the carrier disk 5 and a single or multiple screw or nut thread is to be arranged in the driver element 8. A connecting nut thread of size M14 or 5/8-11" would be particularly suitable here. Such an embodiment of a polishing tool 1 according to the invention is shown in the Figures 1, 2 , 5, 6 , 9 and 10 shown.

For a particularly high performance, it is advantageous if the first and second lamellae 3, 4 are aligned essentially parallel to the rotation axis 2, i.e. standing on the axial front side of the carrier disk 5. The lamellae 3, 4 are arranged along the circumference of the carrier disk 5, preferably projecting radially beyond it. This is particularly good in the Figures 1 to 4 and 9 to 12 Such a polishing tool according to the invention can also be applied over the entire surface for polishing, corresponding to an angle of attack of 0°.

For certain applications, e.g. in the case of a strong curvature or other contouring of the workpiece, it can be advantageous if the first and second lamellae 3, 4 are arranged at an angle to the rotation axis 2 and the carrier disk 5, also preferably projecting radially beyond the edge of the carrier disk 5. Such an arrangement is also often referred to as "lying". Embodiments with such an arrangement of the lamellae 3, 4 are shown in the Figures 5 to 8 shown.

The Figures 1 , 3 , 5 , 7 , 9 and 11 show a perspective view of the embodiments of a polishing tool 1 according to the invention seen from the drive machine side. The Figures 2 , 4 , 6 , 8th , 10 and 12 show a plan view of the embodiments of a polishing tool 1 according to the invention seen from the workpiece side.

Due to the radial projection 10 of the lamellae 3, 4 over the edge of the carrier disk 5, such an embodiment can also be used particularly well for polishing inner edge areas, since this polishing tool 1 reaches into the corners.

It has been found to be expedient to provide a thickness of the lamellae 3, 4 of approximately 1 mm to approximately 20 mm, preferably in the range of approximately 3 mm to approximately 10 mm. In order to adapt the desired properties of a polishing tool 1 according to the invention, the thickness of the first lamellae 3 and the second lamellae 4 can be adapted.

Narrower first lamellae 3 in combination with thicker second lamellae 4 result in greater aggressiveness, i.e. higher removal performance.

For good removal performance, e.g. when burrs are to be removed during fine machining, it is expedient if the second lamellae 4 comprise a fleece with abrasives bound to fibers. For good working results, a grain size of at least about P320 according to FEPA or finer is preferable, corresponding to a particle size of less than about 50 µm.

For the processing of surfaces that are rather dirty, it can be advantageous if the second lamellae 4 comprise a fleece without any fibre-bound abrasives. For low required grinding performance, it can be advantageous if the material of the plastic fibres consists of a plastic filled with an aluminium silicate powder.

For special applications, it can also be advantageous if the polishing body further comprises a number of third lamellae 9, the second and third lamellae 4, 9 each comprising a fleece with and without abrasives bound to fibers. In this way, the advantages of fleece lamellae with and without abrasives can be combined, and at the same time a particularly flexible polishing tool 1 for strongly contoured surfaces can be obtained. Such an embodiment is shown in the Figures 9 and 10 to see.

Depending on the desired hardness of the polishing tool, it can be advantageous if the polishing body has first and second lamellae 3, 4 in a ratio of 1:1, 1:2 or 1:3. An embodiment of a polishing tool 1 according to the invention with first and second lamellae 3, 4 in a ratio of 1:2 is shown in the Figures 11 and 12 shown.

In a particularly economical design of a polishing tool 1 according to the invention for series production, the second lamellae 4 made of fleece are at least partially filled with a polishing paste. The polishing paste is located in the cavities between the fibers of the fleece. This forms a polishing agent depot from which polishing agent is continuously released during the processing process. The amount of polishing agent can be adjusted via the thickness and density of the fleece so that the polishing agent depot in the fleece lamellae is sufficient for the service life of the tool. The user of the polishing agent depot according to the invention The polishing tool 1 is therefore not concerned with questions of selecting the right polishing agent and adding appropriate amounts of polishing agent. Such a polishing tool 1 according to the invention is particularly suitable for the repeated processing of larger surfaces, even by semi-skilled personnel.

It is particularly advantageous if the polishing body of the polishing tool 1 is provided with a covering until it is used, which prevents the polishing agent from drying out. The covering can be designed, for example, in the form of a film or in the manner of a wax covering. The covering is usually removed by the user before using the tool 1. The covering can also be formed by a - possibly reusable - packaging for one or more of the polishing tools 1 according to the invention.

List of reference symbols

1

Polishing tool

2

Rotation axis

3

first slats

4

second slats

5

Carrier disc

6

Hole

7

Metal eyelet

8th

Driving element

9

third slats

10

Got over

Claims (10)

1. A polishing tool (1) which is to be driven in rotation by a driving machine about an axis of rotation (2), which polishing tool has a support body and a polishing body attached to the support body, wherein the polishing body comprises a number of first lamellae (3) and at least a number of second lamellae (4), wherein the first lamellae (3) comprise a polishing felt and the second lamellae (4) comprise a nonwoven, wherein the nonwoven is formed substantially of synthetic fibers and wherein the nonwoven has a higher porosity than the polishing felt.
2. The polishing tool (1) as claimed in claim 1, wherein the support body is in the form of a support wheel (5).
3. The polishing tool (1) as claimed in any one of the preceding claims, wherein the first and second lamellae (3, 4) are oriented substantially parallel to the axis of rotation (2).
4. The polishing tool (1) as claimed in either claim 1 or claim 2, wherein the first and second lamellae (3, 4) are arranged inclined at an angle relative to the axis of rotation (2) and the support wheel (5).
5. The polishing tool (1) as claimed in any one of the preceding claims, wherein the second lamellae (4) comprise a nonwoven with abrasives bonded to fibers.
6. The polishing tool (1) as claimed in any one of claims 1 to 4, wherein the second lamellae (4) comprise a nonwoven without abrasives bonded to fibers.
7. The polishing tool (1) as claimed in any one of the preceding claims, wherein the polishing body further comprises a number of third lamellae (9), wherein the second and third lamellae (4, 9) in each case comprise a nonwoven with and without abrasives bonded to fibers.
8. The polishing tool (1) as claimed in either claim 5 or claim 7, wherein the abrasive bonded to fibers has a grain size of at least 320.
9. The polishing tool (1) as claimed in any one of the preceding claims, wherein the polishing body has first and second lamellae (3, 4) in a ratio of 1:1, 1:2 or 1:3.
10. The polishing tool (1) as claimed in any one of the preceding claims, wherein at least the second lamellae (4) of nonwoven are at least partially filled with a polishing paste.

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