Surface machining tool and surface machining machine equipped with same

Abstract

The invention relates to a surface treatment tool comprising an annular carrier substrate and a plurality of abrasive lamellae 4 connected to the carrier substrate 2 by a narrow side 6 in a contacting juxtaposition of their flat sides 7, at least some of which abrasive lamellae are nonwoven lamellae 4. A particular feature is that the carrier substrate is a flexible band 2, the ends of which point in the longitudinal extension of the band 2 are connected to one another to form a ring shape, and that the nonwoven lamellae 4 are connected to the outward-facing surface of the flexible band 2 by means of an adhesive connection with flexible material properties in a state in which their thickness is elastically compressed.

Description

[0001] The invention relates to a surface treatment tool comprising an annular carrier substrate and a plurality of abrasive lamellae connected to the carrier substrate by a narrow side in a contacting juxtaposition of their flat sides, at least some of which are nonwoven lamellae. The invention further relates to a surface treatment machine equipped with such a surface treatment tool.

[0002] Such surface treatment tools include, for example, tools used to process surfaces by brushing. Such tools are used to create a specific surface appearance on the surface of a workpiece, for example a metal workpiece. This can be a typical brushed surface appearance, or a satin or matt finish. Workpieces are also brushed to remove burrs, round corners, or remove dirt. With the exception of corner or edge rounding or the removal of burrs remaining on the workpiece as a result of previous processes, such as a prior punching process, this type of brushing is ultimately carried out without changing the dimensions of the workpiece. This distinguishes the brushing process from the grinding process, which is a material-removing machining process with an undefined cutting edge.

[0003] Such surface finishing tools have an annular carrier substrate. These previously known surface finishing tools consist of a rigid carrier tube or a corresponding carrier tube section, depending on the length of such a surface finishing tool. Longer surface finishing tools of this type are referred to as brush rollers. The carrier substrate, which is rigid in shape and therefore not flexible, is clamped between two clamping flanges mounted on a drive shaft, which rotates the surface finishing tool for use. The radially outward-facing surface of this carrier substrate bears a multitude of abrasive nonwoven lamellae. The nonwoven lamellae are attached to the carrier substrate with a rigid adhesive bond, with a narrow side following the axis of rotation.Adjacent nonwoven lamellae can contact each other at their facing flat sides. If adjacent nonwoven lamellae do not contact each other directly, a layer of abrasive cloth or a similar material is inserted between them. Surface finishing tools with a ring-shaped carrier substrate made of a rigid material cannot be used for belt machines.

[0004] WO 2010 / 058289 A2 discloses a surface finishing machine with an annular surface finishing tool in the form of a belt. This surface finishing tool is designed as a polishing tool. It comprises a flexible belt as a carrier substrate, to the outer surface of which a flexible, abrasive nonwoven fiber mat is applied. The preferred thickness of the nonwoven fiber mat is specified as 15 mm. Cuts are made in this mat transverse to the belt travel direction to achieve the necessary flexibility so that the flexible belt with the nonwoven fiber mat attached to it can be deflected on deflection rollers. This flexible mat can be a nylon nonwoven fiber impregnated with a synthetic resin-abrasive grain mixture. In this previously known surface finishing tool, the material thickness of the nonwoven fiber available for processing is limited by the thickness of the mat.Due to the limited thickness of such nonwoven mats, the service life of such a surface finishing tool is quite short. Furthermore, with this surface finishing tool, the belt sections guided over deflection rollers cannot be used for brushing the surface of a workpiece, as the incisions in these sections, which achieve the necessary elasticity for deflection, result in gaps forming in the peripheral surface. Surface finishing is difficult to control due to the spaced-apart nonwoven segments. Furthermore, if the surface finishing tool were used in positions where it is guided over a deflection roller, wear on the nonwoven would be significantly increased. This would also significantly reduce the service life of such a surface finishing tool.

[0005] In another embodiment of a surface finishing tool with an annular belt, a circumferential belt serves as the carrier substrate, with base bodies arranged on its outer surface. These base bodies each carry a processing element. Such surface finishing tools are known, for example, from DE 10 2014 115 778 A1 and DE 10 2015 110 115 A1. These surface finishing tools suffer from the same disadvantages as the one according to WO 2010 / 058289 A2.

[0006] Based on this discussed prior art, the object of the invention is to propose a surface treatment tool which is particularly suitable for brushing surfaces, which is not only easier to manufacture, but above all also has a longer service life.

[0007] This object is achieved by a surface treatment tool of the type mentioned at the outset, in which the carrier substrate is a flexible band, the ends of which point in the longitudinal extension of the band are connected to one another to form a ring shape, and in which the nonwoven lamellae are connected to the outwardly facing surface of the flexible band in a state in which they are elastically compressed with respect to their thickness by means of an adhesive connection with flexible material properties.

[0008] With this surface treatment tool, the nonwoven lamellae are connected to the flexible belt as the carrier substrate in an elastically compressed state with respect to their thickness. If abrasive inserts or corresponding layers are arranged between the nonwoven lamellae, these are located between the individual nonwoven lamellae. These have no influence on the compression. Abrasive cloth or similar material can be inserted between each nonwoven lamellae or just between two nonwoven lamella segments, comprising, for example, two, three or more nonwoven lamellae. The lamellae, in particular the nonwoven lamellae, are connected by means of an adhesive bond with flexible, typically permanently elastic material properties, i.e. with an adhesive that remains flexible after it has cured or after the cross-linking process has been completed.The compression of the nonwoven lamellae occurs in the thickness direction, with the nonwoven lamellae typically being connected to the belt with their narrow sides in a direction transverse to the belt travel direction. Thus, the compression of the nonwoven lamellae acts transversely to the plane of their flat sides. In this respect, the elastic properties of such an abrasive nonwoven are cleverly utilized so that, in a curved belt path, for example, when the belt runs around a deflection pulley, adjacent nonwoven lamellae contact each other with their flat sides in the radial direction, preferably over their entire radial extent. A gap formation that occurs in the prior art due to the belt curvature is therefore avoided, at least with a conventional belt curvature, with this surface treatment tool.Therefore, such a belt tool can also be used if it has a curved profile in sections, such as on a deflection pulley of a belt machine, or if the surface processing tool is designed to be clamped on an expansion roller and thus has a curved circumferential surface overall. The service life of such a surface processing tool can be significantly longer than that possible with the surface processing tool according to WO 2010 / 058289 A2, also because the height of the nonwoven lamellas, i.e. their extension from the outside of the flexible belt to the processing surface, which is provided for each nonwoven lamella by the radially outer narrow side of such a lamella, is not dependent on the mat thickness from which the nonwoven lamella is cut. Rather, the height of such a nonwoven lamella can be tailored to the desired requirements.Therefore, there is significantly greater design freedom in the manufacture of such a surface finishing tool.

[0009] The design of the surface finishing tool with a flexible band as a carrier substrate also has positive effects on the CO2 footprint of the companies using such surface finishing tools. Compared to surface finishing tools with a rigid core, a surface finishing tool according to the invention can be packaged by utilizing its radially flexible properties and by utilizing the volume enclosed by the carrier substrate, so that the hollow space present in rigid carrier substrates can be used at least largely for the packaging and transport of such a surface finishing tool and thus for a particularly compact package. In addition, the weight of a carrier substrate designed as a flexible band is significantly lower than that of a rigid, annular carrier substrate.This also has a positive effect on the CO2 footprint, especially in connection with the transport of such surface treatment tools.

[0010] While a generic surface finishing tool requires the abrasive nonwoven lamellae to be mounted on the curved surface of the ring-shaped rigid carrier substrate, the surface finishing tool according to the invention allows the flexible band serving as the carrier substrate to be equipped with the nonwoven lamellae before the band is formed into its ring shape. This allows the carrier substrate to be mounted on a flat surface. This significantly simplifies the manufacturing process.

[0011] Investigations have shown that the service life of a surface finishing tool according to the invention is significantly longer than that of a conventional surface finishing tool with a nonwoven fiber mat connected by its flat extension to a flexible belt as a carrier substrate. This is due to the fact that the radial extension of the nonwoven fiber lamella is significantly greater than the thickness of a nonwoven fiber mat used in the prior art. The service life of such a surface finishing tool is also improved compared to those with a rigid support tube as a carrier substrate if the surface finishing tool is mounted on a radially flexible expansion roller as a rotary drive.

[0012] According to a preferred embodiment of such a surface treatment tool, the longitudinally facing ends of the strip are arranged butt-jointed and connected to one another. In some applications, it has proven expedient for these ends to be provided by an oblique cut in the strip, for example with an inclination of 75 or 80 degrees relative to the course of the long sides or the strip running direction to form the ring shape. The longitudinally facing ends of the flexible strip can of course also be designed without an oblique cut. The longitudinally facing ends of the flexible strip do not necessarily have to be butt-jointed. It is entirely possible to mill the mutually facing sides of the flexible strip down to half their thickness and to glue the ends together in a superimposed arrangement.

[0013] The degree of compression of the abrasive nonwoven lamellae is typically between 20% and 85%, i.e. the original thickness of the nonwoven lamellae cut from a nonwoven mat has been reduced by at least 20%. The degree of compression depends on the curvature around which the surface treatment tool is guided or, if mounted on an expansion roller, on its outer peripheral surface. Furthermore, the degree of compression will be designed depending on the desired application of the surface treatment tool. In a preferred embodiment, the degree of compression is at least 30% to 55%. Higher degrees of compression are also entirely possible. Preferably, the nonwoven lamellae are only compressed to such an extent that a certain compression buffer remains unused in the compression direction. Although compression to a block is possible, it is generally not the aim.

[0014] Abrasive nonwoven lamellae are made of polymer fibers. Nylon nonwoven is particularly suitable. This type of nonwoven obtains its abrasive properties through treatment with a synthetic resin-abrasive grain mixture. For this purpose, the nylon nonwoven can be impregnated with the synthetic resin-abrasive grain mixture or sprayed with it. The nylon nonwoven is open. This means that as a result of the impregnation process, the synthetic resin-abrasive grain mixture thoroughly wets the nonwoven or nonwoven mat. After polymerization, the synthetic resin is flexible and can also exhibit elastic properties. The elastic restoring force built into the nonwoven lamellae through compression results from the elasticity of the fibers used, for example, nylon fibers, possibly supplemented by the elasticity of the synthetic resin containing the abrasive grains and encasing the fibers.

[0015] Preferably, the nonwoven lamellae applied to the flexible belt have a linear extension transverse to the belt travel direction. This means that their course, oriented essentially transversely to the processing direction, is straight.

[0016] However, a nonlinear extension is also conceivable, for example, a curved, wave-shaped extension, or one composed of a plurality of sections adjoining one another at an angle. In this way, the brush properties can be adjusted.

[0017] In a first embodiment of such a surface finishing tool, it is designed to be mounted on a belt machine. Such a surface finishing machine thus has at least two deflection rollers arranged spaced apart from one another in the belt travel direction, at least one of which is driven. The surface finishing tool is guided over the deflection rollers. The entire circumferential surface can be used for brushing a workpiece.

[0018] According to a second embodiment, the annular surface finishing tool is designed to be connected to or clamped onto an expansion roller. Such an expansion roller engages the annular body of the surface finishing tool and clamps it radially during use due to the resulting centrifugal force. The outer surface of such a surface finishing tool that can be used for surface finishing is then cylindrical. In a preferred design of such a surface finishing machine, the expansion roller is elastic in the radial direction or has a certain degree of elasticity. This can be adjusted with an appropriate design of the expansion roller.Such adjustability of the radial elasticity of such an expansion roller can be achieved, for example, by the expansion roller having several reinforcing element receptacles distributed around its circumference. These can be open in the radial direction. Such reinforcing element receptacles can also be open at the front and into which rod-shaped reinforcing elements can be inserted. Depending on the elasticity to be adjusted for a specific application, one or more reinforcing elements are then inserted into each reinforcing element receptacle. These can differ from one another in terms of their reinforcing functionality, so that the elasticity of the expansion roller in the radial direction can also be influenced by the selection of the respective reinforcing element.The elasticity acting in the radial direction can also be achieved using an expansion roller whose interior can be pneumatically or hydraulically opened. This allows the diameter of the outer surface of the clamping section of the expansion roller to be increased for positioning a surface finishing tool, which simultaneously allows the surface finishing tool to be clamped onto the expansion roller. At the same time, the elasticity inherent in the expansion roller is adjusted.

[0019] Such elasticity in the radial direction has the advantage that the desired flexibility of the tool during brushing is provided not only by the abrasive nonwoven lamellae, but also by the elastic flexibility of the expansion roller. This also contributes significantly to a longer service life of the nonwoven lamellae and thus of the surface finishing tool. Since flexibility is still present with this type of surface finishing machine design even when the nonwoven lamellae are largely worn, the surface finishing result is also much more homogeneous over the service life of such a surface finishing tool.

[0020] The invention is described below using an exemplary embodiment with reference to the accompanying figures. They show: Fig. 1:A sectional view of a mechanical brush tool as an example of a surface treatment tool, Fig. 2: a schematic representation of a first manufacturing step for producing the surface treatment tool of the Figure 1 , Fig. 3: a schematic representation of a second manufacturing step for producing the surface treatment tool of the Figure 1 and Fig. 4: a schematic representation of a further manufacturing step for producing the surface treatment tool of the Figure 1 .

[0021] A mechanical or industrial brushing tool as a surface treatment tool 1 has a flexible band 2 as a carrier substrate. The flexible band 2 is tensile in the circumferential and transverse directions and flexible in the radial direction. The flexible band 2 is formed from a flexible band strip whose longitudinal ends abut one another with a bevel cut and are held together by an adhesive strip 3. The adhesive strip 3 does not necessarily serve solely to ensure that the flexible band 2 remains in its closed ring shape.

[0022] A plurality of abrasive nonwoven lamellae 4 are attached to the radially outward-facing surface of the flexible belt. These nonwoven lamellae 4 are sections of a nonwoven mat. The nonwoven lamellae 4 are connected to the flexible belt 2 by means of a permanently elastic adhesive 5 with a narrow side 6 following the longitudinal axis of the ring shape of the flexible belt 2. Due to the beveled cut of the ends pointing in the longitudinal direction of the flexible belt 2 and the axial alignment of the nonwoven lamellae 4 connected to the outside, the end sections of the flexible belt 2 are also connected to one another via the adhesive 5 and the nonwoven lamellae 4 adhesively connected to it, which span the joint of the ends of the flexible belt 2. For the sake of clarity, Figure 1only individual fiber fleece lamellae 4 are shown. These are arranged, as indicated by dash-dotted lines, over the entire circumference of the flexible band 2.

[0023] The nonwoven lamellae 4 of the illustrated embodiment are open nylon nonwoven lamellae impregnated with a plastic-resin abrasive grain mixture. In addition to its function of securing the abrasive grains, the synthetic resin component also serves to stabilize the structure of the nonwoven. Such nonwoven mats, from which the nonwoven lamellae 4 are cut, are well known and therefore require no in-depth discussion within the scope of this discussion. For the purposes of the surface finishing tool 1, the elastic properties of such a nonwoven mat or of the nonwoven lamellae 4 cut therefrom are utilized. In the illustrated embodiment, the nonwoven lamellae 4 are designed with their plastic-abrasive grain mixture finish so that the surface finishing tool 1 can be used for brushing the surface of a workpiece.

[0024] The Figure 1 It can be seen that the nonwoven lamellae 4 in the cross section shown have a trapezoidal outline geometry, wherein the flat sides 7 of adjacent nonwoven lamellae 4 abut one another and thus contact one another, namely over the entire radial extent.

[0025] The nonwoven lamellae 4 arranged on the outside of the flexible belt 2 are in the direction of rotation of the flexible belt 2 (indicated by an arrow in Figure 1 indicated) and in this way into the Figure 4 1 A special feature of this surface treatment tool 1 is that there are no gaps between adjacent nonwoven lamellae 4 on the peripheral surface 8 of the surface treatment tool 1. In the Figure 1In the illustrated embodiment, the surface treatment tool 1 is a brush disk with an axial extension of approximately 5 cm. To use the surface treatment tool 1, it is clamped onto an expansion roller that is inserted into the opening of the flexible belt 2. This expands the surface treatment tool 1 in the direction shown in Figure 1 Can be driven in the direction of rotation shown or in the opposite direction.

[0026] In an embodiment not shown in the figures, the carrier substrate provided by a flexible band is designed to be significantly longer than the flexible band 2 of the surface treatment tool 1 of the Figure 1 This surface finishing tool is designed to equip a belt brushing machine. The surface finishing tool is then guided over two or more deflection rollers. At the deflection rollers, the fiber fleece lamellae have the Figure 1The cross-sectional geometry shown is shown. On the straight belt sections located between the deflection rollers, the nonwoven lamellae are compressed on their outward-facing circumferential surface to the same extent as at the connection of their narrow sides to the flexible belt. Thus, when the surface finishing tool is used, these nonwoven lamellae "breathe" in the transition from a straight section to a curved section guided around a deflection roller, without a gap forming between adjacent nonwoven lamellae on the circumferential surface in the area of ​​a deflection around a deflection roller in a belt brushing machine. This breathing has a positive effect on the surface finishing process, as it carries away any resulting abrasion from the circumferential surface.

[0027] The surface treatment tool 1 of the illustrated embodiment can be used with the Figures 2 to 4can be manufactured using the processing steps shown schematically. In a first step, the flexible belt 2 is prepared and placed on a flat base (not shown). Next to it, the fiber fleece lamellae 4 required to equip the flexible belt 2 are provided, specifically cut or removed from an abrasive fiber fleece mat. The individual fiber fleece lamellae 4 are positioned with their flat sides 7 adjacent to one another in the number required to equip the flexible belt 2, so that their narrow side 6 faces the intended outer side of the flexible belt 2. The original thickness of the fiber fleece lamellae 4 shown in this figure corresponds to the thickness of the fiber fleece mat from which the fiber fleece lamellae 4 are cut out. Depending on the intended design of the surface treatment tool 1, the flexible fiber fleece lamellae 4 can be cut from a fiber fleece mat with a greater or lesser thickness.Typical thicknesses of such nonwoven mats range from 3 to 30 mm. The height of the nonwoven lamellae 4 can also influence the properties of the surface treatment tool 1.

[0028] In a subsequent step, the nonwoven lamellae 4 are compressed, as shown in Figure 3, in the transverse direction to the plane of their flat sides 7. In the illustrated embodiment, the compression is approximately 35%. This degree of compression corresponds to the degree of compression that the narrow sides 6 of the nonwoven lamellae 4 have on the outside of the flexible band 2 of the Figure 1 The compression of the nonwoven lamellae 4 can, as in Figure 3indicated by the block arrows, between two compression plates, which are moved towards each other to compress the nonwoven lamellae 4. In addition, such compression plates hold the nonwoven lamella stack enclosed by them between the compression plates and can be positioned on the upper side of the flexible band 2. Before positioning such a nonwoven lamella stack on the flexible band 2, the adhesive 5 is applied to the flexible band 2. This can be applied over the entire surface of the outer surface of the flexible band 2. In another embodiment, it is provided that this is applied in several adhesive beads following the longitudinal extent of the flexible band 2. In the not yet cured or cross-linked adhesive 5, as in Figure 4shown, the fiber fleece lamella stack formed from the compressed fiber fleece lamellae 4 is immersed and held in this position until the adhesive 5 has cured to such an extent that the compression in the region of the narrow sides 6 of the fiber fleece lamellae 4 is permanently maintained.

[0029] In a subsequent step, the flexible band 2 is connected to the Figure 1shown ring body is formed and the ends, which are made with a beveled cut 9 and point in the longitudinal direction, are connected to one another by the adhesive strip 3. The gap then located between the last fiber fleece lamellae 4 is filled by inserting further compressed fiber fleece lamellae 4. For this purpose, this outer ring section of the flexible band 2 is previously coated again with adhesive 5. If the adhesive 5 is applied as adhesive beads following the longitudinal extent of the flexible band 2 and running at a distance from one another, fresh adhesive beads can be applied in the spaces between the adhesive beads for this last step, which then serve to provide the necessary hold for the last fiber fleece lamellae 4 installed.

[0030] In a preferred embodiment of a use of the Figure 1In the case of the surface treatment tool 1 shown, it is clamped onto an expansion roller which has a certain elastic resilience in the radial direction. This has the advantage that a pressure acting in the radial direction on the circumferential surface 8 when the surface treatment tool 1 is used does not have to be compensated solely by the nonwoven fabric lamellae 4, but can also be absorbed by the elastic resilience in the radial direction of the expansion roller. In order to process a workpiece with the surface treatment tool 1 on its circumferential surface 8, a certain processing pressure is required. Since this pressure is partially absorbed by the elastic restoring force of the expansion roller carrying the surface treatment tool 1, the nonwoven fabric lamellae 4 are only subjected to a lesser degree of elastic stress in the radial direction.This has a positive effect on a not insignificant extension of the service life of the surface treatment tool 1.

[0031] In the surface treatment tool 1, the degree of compression of its nonwoven lamellae 4 can be determined retrospectively in two different ways: In a first possibility, a nonwoven lamella 4 is removed from the flexible belt 2 in a first step. The gap thus created between the nonwoven lamellae 4 surrounding the nonwoven lamellae 4 will close over time due to the relaxation force stored in the surrounding nonwoven lamellae 4. The nonwoven lamellae 4 immediately adjacent to the gap will be partially pressed into the gap by nonwoven lamellae 4 further away from the gap, and in some cases, these lamellae will expand directly into the gap. The verification according to this first possibility is thus carried out on the surface treatment tool 1.

[0032] In a second option, a nonwoven lamella 4 is also removed from the flexible belt 2 in a first step. Care must be taken to ensure that no adhesive residue remains on its adhesive side. Due to the restoring force stored in the nonwoven lamella 4 acting transversely to its flat side 7, this nonwoven lamella 4 automatically returns to its original thickness. The verification according to this second option is thus carried out on the nonwoven lamella 4 removed from the surface treatment tool 1.

[0033] The recovery due to relaxation, which is used to demonstrate the previous compression according to both options, can take some time. To accelerate this process, a noticeable dimensional change can be achieved by applying heat, for example, in an oven at 80 to 130°C.

[0034] The invention has been described using exemplary embodiments. Without departing from the scope of protection described by the applicable claims, numerous further embodiments for implementing the inventive concept will become apparent to those skilled in the art without the need for further explanation within the scope of these statements. List of reference symbols

[0035] 1Surface finishing tool 2Flexible tape 3Adhesive strip 4Fiber fleece lamella 5Adhesive 6Narrow side 7Flat side 8Circumferential surface 9Bevel cut

Claims

1. Surface treatment tool, comprising an annular carrier substrate and a plurality of abrasive lamellae (4) connected to the carrier substrate (2) with a narrow side (6) in a contacting juxtaposition of their flat sides (7), at least some of which are nonwoven lamellae (4), characterized in that the carrier substrate is a flexible band (2) whose ends pointing in the longitudinal extension of the band (2) are connected to one another to form a ring shape, and that the nonwoven lamellae (4) are connected by means of an adhesive connection with flexible material properties to the outwardly facing surface of the flexible band (2) in a state in which they are elastically compressed with respect to their thickness.

2. Surface treatment tool according to claim 1, characterized in thatthe degree of compression of the nonwoven lamellae (4) is provided in such a way that, by utilising the restoring force stored in them by the elastic compression in the direction of their original thickness, when the surface treatment tool (1) is used as intended and the belt is curved, neighbouring lamellae (4) contact each other with their flat sides (7) over their entire radial extent.

3. Surface treatment tool according to claim 1 or 2, characterized in that the degree of compression of the nonwoven lamellae (4) is between 20% and 85%, in particular between 30% and 55%.

4. Surface treatment tool according to one of claims 1 to 3, characterized in that the flat sides (7) of the nonwoven lamellae (4) are aligned transversely to the belt running direction.

5. Surface treatment tool according to claim 4, characterized in thatthe nonwoven lamellae (4) applied to the flexible belt (2) have a linear or non-linear extension transverse to the belt running direction, for example a curved, wave-shaped or formed in individual sections adjoining one another at an angle.

6. Surface treatment tool according to one of claims 1 to 5, characterized in that the abrasive nonwoven lamellae (4) are open nylon nonwoven lamellae impregnated with a synthetic resin-abrasive grain mixture.

7. Surface treatment tool according to one of claims 1 to 6, characterized in that an abrasive layer is inserted between adjacent nonwoven lamellas.

8. Surface treatment tool according to one of claims 1 to 7, characterized in that the ends pointing in the longitudinal direction of the flexible band (2) are connected to one another in a butt-fitting manner.

9. Surface treatment tool according to claim 8, characterized in thatthe ends pointing in the longitudinal direction of the flexible band (2) are cut obliquely to the longitudinal direction, the two oblique cuts being complementary to one another.

10. Surface treatment machine with at least two deflection rollers arranged at a distance from one another, at least one of which is rotationally driven, and with a surface treatment tool (1) according to one of claims 1 to 9 guided over the deflection rollers.

11. Surface treatment machine with an expansion roller which is elastically flexible in the radial direction and with a surface treatment tool (1) according to one of claims 1 to 9 clamped on the expansion roller.

12. Surface treatment machine according to claim 11, characterized in that the elasticity of the expansion roller can be adjusted.

13. Surface treatment machine according to claim 12, characterized in thatthe expansion roller has a plurality of reinforcing element receptacles arranged distributed over its circumference and reinforcing elements are provided, wherein at least one reinforcing element can be inserted into one or more reinforcing element receptacles depending on the elasticity to be set for a specific machining of a surface of a workpiece.

14. Surface treatment machine according to claim 12, characterized in that for clamping the surface treatment tool (1) on the expansion roller and for adjusting its elasticity acting in the radial direction, the latter can be acted upon pneumatically or hydraulically to enlarge its clamping section provided for positioning a surface treatment tool (1).

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