EP2611573B1 - Grinding wheel unit for a rotary grinding machine - Google Patents
Grinding wheel unit for a rotary grinding machine Download PDFInfo
- Publication number
- EP2611573B1 EP2611573B1 EP11748385.9A EP11748385A EP2611573B1 EP 2611573 B1 EP2611573 B1 EP 2611573B1 EP 11748385 A EP11748385 A EP 11748385A EP 2611573 B1 EP2611573 B1 EP 2611573B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- grinding disc
- extraction
- suction
- sanding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000227 grinding Methods 0.000 title claims description 219
- 239000000428 dust Substances 0.000 claims description 58
- 238000000605 extraction Methods 0.000 claims description 34
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- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000010422 painting Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
- B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
- B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
- B24B41/047—Grinding heads for working on plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
- B24D9/08—Circular back-plates for carrying flexible material
Definitions
- the present invention relates to a grinding disc unit for a rotary grinding machine, as it is used for the production of fine surfaces, for example in the automotive, furniture, painting and plastics sector.
- BE 855 087 A1 is a device with hollow pins made of hard metal for the mechanical Entlacken of surfaces known.
- the hollow pins of the device are elastically attached and scrape in the sense of a wire brush paint from the surface to be painted.
- the publication WO 2009/088772 A2 D1 describes adapters for grinding machines which are arranged between a sanding pad and a grinding wheel and which are intended to ensure the transport of dust between each grinding wheel and each sanding pad.
- the publication EP 1 291 134 A1 describes a grinding plate for use on hand-held power tools, in particular eccentric grinder and hand swing grinder, consisting of a hub with support plate on the underside of which an elastic support cushion is supported on which a Velcro an abrasive sheet is fastened.
- the support plate is designed as a bistable leaf or plate spring, so that the grinding plate is particularly suitable for processing curved surfaces can be used.
- suction hoods are offered for such rotary grinding machines as angle grinders, which usually completely surround the grinding plate of the rotary grinding machine and which are intended to receive the grinding dust thrown outwards by the grinding wheel.
- suction hoods are provided on the edge with a brush ring.
- suction hoods are machine-specific and are offered only for a few rotary sanding machines.
- the extraction hood is firmly connected to the machine housing for each machine and is system-related by a great deal larger than the sanding pad and the sanding sheet, so that during the sanding process the sanding result is not visible and pinpoint sanding is not possible.
- the cover conceals the user's view of the edge of the grinding wheel.
- a corresponding arrangement with a suction cup completely surrounding the suction hood is in the DE 10 2004 018 727 A1 shown.
- the grinding wheel is usually set at an acute angle to the workpiece, which means that the disk is not always in contact with the workpiece with the entire grinding wheel surface. Accordingly, such a suction hood has a more or less large distance from the workpiece and the brush ring can not seal cleanly on the workpiece. This also leads to a poorer suction and increased dust load.
- the grinding plate unit according to the invention has an integrated suction device in the form of a suction hood which is rotatably mounted directly on the drive shaft of the grinding plate.
- the sanding pad has suction openings, which penetrate the sanding pad and over which the back of the sanding pad can be sucked through the sanding disk by means of the dust extraction hood. Since the suction hood is rotatably mounted on the drive shaft, there results an integrated sanding pad unit which can be used independently of the particular rotary grinding machine used.
- the connection between the sanding pad unit and the rotary grinding machine takes place only via the drive shaft, which is screwed to a tool holder of the rotary grinding machine. Accordingly, rotary sanding machines without suction can be retrofitted with a sanding unit with integrated suction.
- the suction hood is arranged on the rear side of the sanding pad, dust extraction through the sanding pad can take place via it.
- the dust is therefore sucked off directly at the grinding surface and does not first have to be thrown outwards by the grinding wheel in order to be sucked off outside the grinding wheel by a projecting hood.
- this increases the service life of the grinding wheels, as they clog less quickly.
- the sanding pad unit is preferably designed as a retrofittable sanding pad unit which can be used universally together with any rotary sanders.
- any rotary grinder for dust-free grinding can be equipped with a grinding disc unit according to the invention.
- the drive shaft preferably represents the only necessary connection of the sanding pad unit with a rotary grinding machine, so that the sanding pad unit is designed to be machine-independent.
- the only necessary connection of the sanding pad unit with the rotary grinding machine takes place at the connection flange of the rotary grinding machine, to which the sanding pad unit is screwed instead of the usually used sanding pads. Further connection possibilities between sanding pad unit and rotary grinding machine are not necessary.
- the suction hood is preferably not part of a rotary grinding machine and / or the suction hood can not be connected directly to the rotary grinding machine.
- the suction hood is, in contrast to the prior art, an integral part of the sanding pad unit and not part of a rotary grinding machine, so that the sanding pad unit can be used independently of the machine.
- the rotary grinding machine can be equipped with sanding pad units of different sizes, for each of which an optimal extraction of the grinding dust is guaranteed.
- the suction hood is preferably fastened to the drive shaft via a rotary bearing, in particular a ball bearing.
- a rotary bearing in particular a ball bearing.
- the suction hood needs no further attachment, especially not on the rotary grinder.
- a sealed ball bearing is used for fastening the suction hood to the drive shaft.
- the suction hood is designed so that the outer edge of the sanding pad remains visible during operation. This ensures precise grinding and optimal control of the grinding result.
- the suction hood also does not hinder the user when grinding up to edges, etc.
- the suction hood preferably has a brush ring or a sliding ring on its edge facing the sanding pad.
- the brush ring or the sliding ring allows a rotation of the sanding plate with respect to a stationary suction hood and at the same time ensures a good seal between these two parts in order to use the generated negative pressure in the exhaust hood as completely as possible for the dust extraction through the grinding wheel.
- the suction hood preferably has a connecting piece for a hose of a dust extraction device.
- An industrial vacuum cleaner is usually connected to the connecting piece of the extraction hood, which sucks and absorbs the dust that forms during grinding.
- the hose prevents the suction hood from rotating with the sanding pad due to the remaining friction in the pivot bearing.
- the drive shaft on a rubber element. This compensates for a tilting of the sanding disk and ensures that the sanding disk always rests flat on the workpiece, if desired, and thus no sanding marks are caused.
- the suction hood preferably has a bellows on its jacket.
- the bellows compensates for slight differences in angle between the extraction hood and the sanding pad and ensures a good seal between these components.
- the sanding pad is inventively provided on the front with a Velcro layer for attachment of velcro sanding wheels.
- the Velcro layer provides a simple and mechanically secure attachment of wheeled grinding wheels and on the other hand, perforated grinding wheels can be used, in which the dust transport takes place on the back of the grinding wheels through the Velcro layers.
- the suction openings in the sanding pad can be arranged at the optimal procedural positions and do not have to coincide with any openings in the grinding wheel.
- the suction openings are arranged according to the invention at least in the region of the outer edge of the sanding pad. Due to the high rotational speeds of the sanding disc during sanding, dust is thrown outward due to the centrifugal force - especially in the case of dust transport in the Velcro layers - and then sucked out on the grinding wheel by the suction openings arranged there at the edge of the sanding disc. This ensures that even sanding dust, which is produced at the edge of the sanding pad, is not thrown outwards, but is safely extracted.
- the suction openings are arranged on the edge of the sanding pad so that suction openings are always present in the radial direction on the entire circumference of the sanding pad. This ensures that dust, which moves due to the centrifugal force in the radial direction from the center of the grinding wheel outwards to the edge, always meets a suction opening at the edge of the grinding disc and is sucked through it. Seen in the radial direction, therefore, there are no gaps between suction openings through which dust could be thrown outwards without being sucked off.
- a preferred sanding pad for a rotary grinding machine has Absaugöff openings, which penetrate the sanding pad, wherein the suction openings are arranged on the edge of the sanding pad that seen in the radial direction on the entire circumference of the sanding pad suction always exist.
- resulting dust that enters through openings, especially perforations, in the grinding wheel in the Velcro layers behind the loop plane and then moves radially through the centrifugal forces outwards meets on this way at the edge of the sanding pad always on a suction through which the dust is sucked through the back through the sanding pad. Accordingly, dust from the grinding wheel can no longer be thrown outwards and pollute the environment.
- the suction openings are formed as curved, mutually overlapping slots. It has been found that relatively narrow, curved, mutually overlapping slots on the edge of the sanding pad ensure optimum extraction of the sanding dust, especially with perforated grinding wheels.
- the edge of the grinding plate is rounded at the front.
- the sanding disc mounted on the sanding pad exerts a lower pressure during sanding than at the edge.
- This is advantageous insofar as the edge of the grinding wheel leaves no grinding marks, which results in a better grinding result overall, in particular during fine and polishing grinding results.
- a rounded edge of the sanding plate also edging be ground with a rounded throat.
- the sanding pad unit according to the invention is able, since it - in contrast to an eccentric grinder - does not use an eccentric stroke but a pure rotational movement. Thus, can be ground into edges with the edge of the sanding plate.
- the edge of the sanding plate is widened to form a lateral surface. This also allows a qualitatively optimal and fast grinding of an edge or groove of a workpiece, wherein a precise radius of the groove can be formed. Again, this is not possible with eccentric grinders.
- the lateral surface of the sanding plate is broken with suction.
- the dust that forms during grinding on the lateral surface of the sanding pad can be sucked through the grinding wheel through.
- Another aspect of the present invention relates to the use of a sanding pad assembly according to any of claims 1-10 with perforated, grindable grinding wheels.
- the abovementioned advantages of the sanding pad unit according to the invention are provided, in particular, when used together with perforated, slidable grinding wheels, in which dust which forms during grinding is removed by the shortest route through perforation openings in the grinding wheel from the grinding surface to the back into the Velcro layers, and there the suction holes in the sanding pad is sucked and then sucked through the sanding pad through.
- perforated grinding wheels can be advantageously used now also with rotary grinding machines, which have a significantly higher removal rate compared to oscillating grinding machines.
- FIGS. 1 to 5 show a non-inventive embodiment of a sanding pad unit 1 for a rotary grinding machine 100.
- the sanding pad unit 1 comprises a drive shaft 20, to which by means of a screw 50, a sanding pad 10 rigid connected is.
- a suction hood 30 is rotatably mounted on the drive shaft 20 via a ball bearing 40, via which dust can be sucked through the sanding pad 10 by means of a suction hose 120, which is fastened to an intake pipe 34.
- the suction hood 30 is rotatably mounted only on the drive shaft 20.
- a ball bearing 40 is inserted into a cylindrical receptacle 36 of the suction hood 30, which is held in the receptacle 36 by means of a shaft securing ring 70.
- the bearing 40 is adapted to the outer diameter of the shaft 20 and is in contact with a stop ring 22.
- the bearing 40 is held on the drive shaft 20 by means of a further shaft locking ring 60, which rests in a groove on the outside in the drive shaft 20.
- a sealed ball bearing is used for the ball bearing 40 in order to maintain the highest possible negative pressure within the suction hood 30 during operation.
- the drive shaft 20 has at its upper end a bore 24 with an internal thread, which can be fastened to a tool holder 110 of a rotary grinding machine 100 by screwing.
- the sanding pad unit 1 can be connected to a rotary grinding machine 100, which need not have any special design features for a suction. Therefore, the sanding pad unit 1 is suitable for retrofitting ordinary rotary grinding machines 100 without suction, so that dust-free grinding can be performed even with such machines.
- the only necessary connection of the grinding part unit 1 with the rotary grinding machine 100 is produced via the drive shaft 20, so that the grinding plate unit 1 can be used independently of the machine with any rotary grinders 100.
- the sanding pad unit 1 is connected via the suction nozzle 34 with a suction hose 120, which is connected to a conventional industrial vacuum cleaner (not shown).
- the connection to the sanding pad unit 1 to the suction hose 120 prevents rotation of the suction hood 30 in the grinding operation. Since the suction hood is preferably mounted rotatably on the drive shaft 20 by means of a ball bearing 40, this requires only a small holding force, which can be applied very easily by the suction hose 120.
- the extraction via an industrial vacuum cleaner and via the suction hose 120 takes place independently and in addition to the drive by a rotary grinder 100.
- the present invention is not limited to hand-held rotary grinders, such as the angle grinder of Fig. 8 limited.
- the sanding pad unit 1 can also be used in industrial grinding machines or grinding machines in which rotating sanding discs are used for the serial machining of workpieces.
- the advantages according to the invention of a lower dust load of the environment, a significantly longer service life of the grinding wheels and a better surface quality result.
- a brush ring 32 is attached to the suction hood 30 between the fixed suction hood 30 and the rotating in operation sanding pad 10 in the first embodiment, which seals the necessary gap between suction hood 30 and sanding pad 10.
- Fig. 2 shows that the outer diameter D of the shell 39 of the suction hood 30 substantially corresponds to the outer diameter of the sanding pad 10.
- the sanding pad 10 preferably consists of a thin plate, for example a 2-4 mm thick aluminum plate, are introduced into the suction openings 16.
- the grinding dust produced at the grinding surface passes through the suction openings 16 in the sanding pad 10 and is sucked by the negative pressure within the suction hood 30 via the suction nozzle 34 from the suction devices (hose 120 and industrial vacuum cleaner).
- Velcro layer 13 which is for example a Velcro hook layer or a Velcro mushroom layer
- velcro sanding wheels 130 can be attached.
- Such velcro-type grinding wheels consist of a paper, fabric or film carrier on which a Velcro adhesive layer, in particular a Velcro fleece layer or a velcro velor layer, is glued on the back.
- the abrasive wheel 130 is provided with abrasive abrasive grains which are held to the backing by a suitable potting material.
- slidable grinding wheels 130 are provided with openings through which the grinding dust, which is formed on the grinding surface, can be sucked off.
- grinding wheels for suction devices, namely grinding wheels with a few relatively large suction openings, which are brought into conformity with corresponding suction openings in the sanding pad 10.
- grinding wheels have the disadvantage that the path of the abrasive grain on the grinding surface up to the corresponding suction opening is relatively long and therefore enforce such grinding wheels relatively quickly and become unusable.
- perforated grinding wheels 130 which have a perforation of small perforation openings 132, which are distributed substantially over the entire surface of the grinding wheel 130.
- Exemplary grinding wheels 130 having such perforation openings 132 distributed substantially over the entire surface of the grinding wheel 130 are shown in FIGS Figures 10A-10E shown.
- the embodiments shown there show grinding wheels 130 with a diameter of about 115 mm, wherein the perforation openings 132 of the grinding wheels 130 of FIGS. 10A-C a diameter of 1 to 2 mm, the grinding wheels of Fig. 10D a diameter of 2 to 4 mm and the grinding wheels of Fig. 10E have a diameter of 4 to 6 mm.
- the distance between the perforations of the Figure 10A , C and D is a minimum of 6 mm and a maximum of 10 mm
- the grinding wheels of Fig. 10E it is a minimum of 10 mm and a maximum of 30 mm.
- the pattern of the perforation openings 132, their size and their distance from each other is determined by the respective desired grinding task.
- Such grinding wheels 130 are common in sizes of preferably 50, 115, 150, 200 mm to 500 mm in diameter.
- Such perforated grinding wheels 130 ensure full-surface dust removal over substantially the entire surface of the grinding wheel 130.
- the grinding dust is sucked through the prevailing vacuum through each perforation opening 132, passes through the pad and into the Velcro layers. There, the dust flows in the Velcro layer to the suction openings 16 in the sanding pad 10, through which it is sucked.
- the dust transport therefore takes place on the back of the grinding wheel in the Velcro adaptation layer and in the Velcro hook layer.
- a grinding plate 10 with a specific arrangement of the suction openings 16, 17 is proposed for perforated grinding wheels 130. Due to the high rotational speeds of the sanding pad 10 during operation, the dust is transported radially outwards due to the centrifugal force. In order to ensure a dust-free grinding as possible, therefore, the suction openings 16, 17 should be located near the edge 18 of the sanding pad 10 so that dust is formed there can be safely sucked against the centrifugal force. Dust that arises in the inner region of the grinding wheel 130, inevitably migrates outward towards the edge 18 and is then also sucked there. Preferred patterns for suction openings 16, 17 are in the FIGS. 6 and 7A to 7C shown.
- the suction openings 17, 17 'so arranged on the edge 18 of the sanding pad 10 that in radial projection (that is, radially from inside to outside), on the entire circumference of the sanding pad 10 is always a suction 17, 17' is present and there are no gaps in between.
- the suction openings 17, 17 ' are formed as curved, mutually overlapping slits 17, which are arranged in two concentric circles.
- the slots are about 1 - 2 mm wide and the outer ring about 30 mm and the inner ring about 15 mm long.
- the slots 17 'of the inner ring are in front of the necessary gaps between the slots 17 of the outer ring.
- the shape and arrangement of the overlapping suction openings 16, 17 can be varied depending on the size of the sanding pad or embodiment. It is important, however, that seen from the inside to the outside there are no gaps between the suction openings through which the dust could escape to the outside. At a minimum, the gaps should not be so great that the centrifugal forces acting on the dust are greater than the forces due to the suction effect.
- the dust resulting from the grinding passes through the perforation openings 132 through the base of the grinding wheel 130 and into the Velcro layers behind the loop plane due to the suction effect, is then transported radially outwards by the suction air and the centrifugal force and then through one of the suction openings 16, 17 , which are located at least on the edge 18 of the sanding pad 10, sucked into the suction hood 30 inside. From there, the dust is extracted from the suction nozzle 34 and the suction hose 120 in a suction device (for example, an industrial vacuum cleaner). This is a nearly dust-free grinding possible with the sanding unit 1.
- a suction device for example, an industrial vacuum cleaner
- FIG. 7A Other designs for preferred suction are in the Figures 7A, 7B and 7C shown.
- FIG. 7A are in addition to curved slots 16 at the edge 18 of the sanding plate still curved slots 16 'in the inner region of the sanding pad, which shortens in large sanding disc diameters, for example, with diameters of 150 mm, 200 mm or greater the way that cover the dust in the Velcro layers got to. Thus, there may be less congestion of the dust there.
- suction openings 16 are arranged in front of the gaps between the slots 16, which prevent passage of dust through the gaps between the slots 16.
- FIG. 7C shows a simple form of a sanding pad 10 with arranged at the edge 18 curved suction slots 16, in which the distance between the Slots is chosen so that the suction effect is sufficient to suck dust that wants to pass between the slots to pass through the outside, in the slots.
- FIG. 4 shows another hole pattern for the suction openings 16 on the grinding plate 10, which is particularly suitable for grinding wheels of the type with a few larger holes.
- the sanding pad 10 of FIG. 5 is also provided with suction openings 16, 17, for example those of FIGS. 6 and 7A to C , these being in FIG. 5 are not shown.
- FIG. 9 shows a further non-inventive embodiment of a sanding pad unit 1.
- This sanding pad unit 1 differs from the sanding pad unit 1 of Figures 1 - 5 in that the drive shaft 20 has a rubber element 26, so that during the fine grinding of the sanding pad 10 with the grinding wheel 130 always rests flat on the surface to be ground. This prevents tilting of the grinding wheel 130 and ensures a scoring-free grinding result.
- the jacket of the suction hood is equipped with a bellows 38.
- a sliding ring 37 preferably made of a plastic material such as Teflon reduces the friction between the suction hood 30, which is preferably made of a Kunststoffinaterial, and the sanding pad 10.
- the bellows 38 presses the sliding ring 37 against the sanding pad 10th
- the grinding wheels 130 of Figures 10A and 10B represent two examples of perforated grinding wheels, which can differ in different sizes, grain sizes, perforation opening sizes, number of perforation openings, distance of the perforation openings, arrangement of the perforation openings, etc. It is important in this type of perforated grinding wheels 130, however, that the perforation substantially over the entire surface of the Grinding wheel 130 extends so as to ensure a dust removal over the entire grinding surface.
- FIGS. 11-15 show a preferred embodiment of a sanding pad 10 according to the invention.
- the edge region 19 ' In contrast to the grinding plate 10 of Figure 1-9 has the sanding pad 10 of the FIGS. 11-13 an edge region 19 ', which is rounded at the front 12 of the sanding pad 10.
- the edge region 19 ' exerts a lower pressure on a grinding wheel 130 attached to the sanding pad 10 than in inner regions of the front side 12 of the sanding pad 10, which prevents sanding marks during fine sanding.
- the edge 19 of the grinding plate 10 is also pulled upwards, as in the FIGS. 11-15
- the sanding pad 10 and the sanding pad unit 1 can be used to grind upturns and fillets 202 of a workpiece 200.
- the edge area grinding wheels 130 'are used as they are in Fig. 15 are shown by way of example.
- These grinding wheels 130 ' also have perforations 132, as shown in FIGS Figures 10A and 10B are shown by way of example.
- Abrasive wheels 130 ' which can also be made of a flexible material, bend up during the grinding of upstands 202 and abut against the rounded edge 19' and the lateral surface 19 ".
- the suction openings 17, 17 ' are arranged so that in the radial direction, seen from the inside out, on the entire circumference of the grinding plate 10 always suction openings 17, 17' are present, so that the from the centrifugal force thrown outward dust is transported on the edge 18 through the sanding pad 10 to the rear.
- the lateral surface 19 "can be broken with suction 16 'to ensure on the lateral surface 19" dust extraction.
- the sanding pad 10 further has an opening 52 for attachment to the drive shaft 20 with a screw 50.
- the Fig. 16 shows a preferred embodiment of a sanding pad unit 1 which a sanding pad 10 of FIGS. 11-15 With the rounded edge 19 ', which is widened upward to a lateral surface 19 ", the jacket 39 of the suction hood 30 can engage in the sanding plate 10 from above and thus seal against the sanding pad 10. Also in this embodiment, the diameter of the jacket 39 of the suction hood 30 substantially corresponds to the diameter of the sanding pad 10, so that in particular at the edge region 18 dust can be sucked through the sanding pad 10 through. Thus, a processing of Aufkanturgi and grooves 202 is easily possible, however, the diameter of the sanding pad 10 is slightly increased compared to the diameter of the shell 39 of the suction hood.
- Fig. 16 Compared with the sanding pad units of the Figures 1 - 5 is in the embodiment of the Fig. 16 extends the intake manifold 34, which on the one hand better leverage for holding the suction hood 30 and on the other hand, another guide a suction hose (not shown) allows, which is connected to the suction 34.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Description
Die vorliegende Erfindung betrifft eine Schleiftellereinheit für eine Rotationsschleifmaschine, wie sie zur Herstellung feiner Oberflächen, beispielsweise im Automobil-, Möbel-, Maler- und Kunststoffbereich eingesetzt wird.The present invention relates to a grinding disc unit for a rotary grinding machine, as it is used for the production of fine surfaces, for example in the automotive, furniture, painting and plastics sector.
Zur Herstellung feiner Oberflächen werden hauptsächlich Handschleifmaschinen, wie beispielsweise Exzenter-, Delta- und Schwingschleifer eingesetzt. Einer der Hauptgründe hierfür ist, dass diese Schleifmaschinen mit Absaugvorrichtungen versehen sind, die es ermöglichen, den beim Schleifen anfallenden Schleifstaub abzusaugen, was die Schleifleistung der Schleifmittel erhöht und zudem ein besseres Schleifergebnis zur Folge hat. Aufgrund der oszillierenden Schleifbewegungen sind die Abtragsmengen beim Schleifen mit diesen Maschinen jedoch wesentlich geringer als mit Rotationsschleifmaschinen, bei denen das Schleifmittel kontinuierlich in einer Richtung rotiert. Für Schleifarbeiten, bei denen eine große Abtragsleistung gewünscht und erforderlich ist, werden daher Rotationsschleifmaschinen, beispielsweise sog. Winkelschleifer, eingesetzt.To produce fine surfaces mainly hand grinders, such as eccentric, delta and orbital sander are used. One of the main reasons for this is that these grinders are equipped with suction devices that allow to absorb the grinding dust generated during grinding, which increases the grinding performance of the abrasives and also results in a better grinding result. However, due to the oscillating grinding motions, the amounts of material removed from grinding with these machines are substantially lower than with rotary grinding machines in which the abrasive rotates continuously in one direction. For grinding work in which a large removal rate is desired and required, rotary grinding machines, for example so-called angle grinders, are therefore used.
Anwendungsbereiche für derartige Rotationsschleifmaschinen sind beispielsweise das Abschleifen dicker Lack- oder Farbschichten auf Holz oder Metall. Auch das Abschleifen der sehr harten Antifouling-Beschichtungen von Bootsrümpfen wird fast ausschließlich mit Rotationsschleifmaschinen durchgeführt. Jedoch ist dies wegen der fehlenden Absaugung weder für die Gesundheit des Anwenders, noch für die Umwelt optimal, da diese Beschichtungen als giftig eingestuft sind und bei Abschleifen der Schleifstaub in die Umwelt gelangt. Dementsprechend müssen bei solchen Schleifarbeiten besondere Umweltauflagen eingehalten werden und darauf geachtet werden, dass kein Schleifstaub in die Umgebung und auf den Boden gelangt, wo dieser bei Regen in das Grundwasser gespült werden könnte.Applications for such rotary grinding machines are, for example, the grinding of thick paint or ink layers on wood or metal. Also, the grinding of the very hard antifouling coatings of boat hulls is almost exclusively carried out with rotary grinders. However, this is due to the lack of suction neither for the health of the user, nor for the environment optimal, since these coatings are classified as toxic and when grinding the sanding dust gets into the environment. Accordingly, special environmental requirements must be met in such grinding and Care must be taken to ensure that no sanding dust gets into the environment and on the ground, where it could be flushed into the groundwater when it rains.
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Neueren Entwicklungen zufolge werden für derartige Rotationsschleifmaschinen wie Winkelschleifer Absaughauben angeboten, welche den Schleifteller der Rotationsschleifmaschine meist komplett umgeben und die den von der Schleifscheibe nach außen geschleuderten Schleifstaub aufnehmen sollen. Zur Abdichtung zum Werkstück hin sind einige dieser Absaughauben am Rand mit einem Bürstenkranz versehen.According to recent developments, suction hoods are offered for such rotary grinding machines as angle grinders, which usually completely surround the grinding plate of the rotary grinding machine and which are intended to receive the grinding dust thrown outwards by the grinding wheel. For sealing to the workpiece, some of these suction hoods are provided on the edge with a brush ring.
Derartige Absaughauben sind jedoch maschinenspezifisch und werden nur für einige wenige Rotationsschleifmaschinen angeboten. Die Absaughaube ist bei jeder Maschine fest mit dem Maschinengehäuse verbunden und ist systembedingt um Einiges größer als der Schleifteller und das Schleifblatt, sodass während des Schleifvorgangs das Schleifergebnis nicht einsehbar und ein punktgenaues Schleifen nicht möglich ist. Die Abdeckhaube verdeckt die Sicht des Anwenders auf die Kante der Schleifscheibe. Eine entsprechende Anordnung mit einer den Schleifteller vollständig umgebender Absaughaube ist in der
Bei einigen vorbekannten Maschinen wird diesem Problem Rechnung getragen, indem die Absaughaube über einen gewissen Winkelbereich offen ist und einen Blick auf die Schleifscheibe ermöglicht. Jedoch erfolgt in diesem Bereich dann keine Absaugung mehr, sodass bei derartigen Maschinen trotz Absaugung sehr viel Schleifstaub freigesetzt wird.In some prior art machines, this problem is taken into account by the exhaust hood over a certain angular range is open and allows a view of the grinding wheel. However, no extraction takes place in this area, so that a lot of grinding dust is released in such machines despite suction.
Hinzu kommt, dass bei einem Schleifen mit einem Rotationsschleifer im Gegensatz zum Schleifen mit einem Exzenterschleifer die Schleifscheibe meistens in einem spitzen Winkel zum Werkstück angestellt wird, was bedeutet, dass die Scheibe nicht immer mit der gesamten Schleifscheibenfläche in Kontakt mit dem Werkstück steht. Dementsprechend hat auch eine derartige Absaughaube einen mehr oder weniger großen Abstand zum Werkstück und der Bürstenkranz kann nicht mehr sauber am Werkstück abdichten. Auch dies führt zu einer schlechteren Absaugung und einer erhöhten Staubbelastung.In addition, when grinding with a rotary grinder as opposed to grinding with an orbital sander, the grinding wheel is usually set at an acute angle to the workpiece, which means that the disk is not always in contact with the workpiece with the entire grinding wheel surface. Accordingly, such a suction hood has a more or less large distance from the workpiece and the brush ring can not seal cleanly on the workpiece. This also leads to a poorer suction and increased dust load.
Es ist daher die Aufgabe der vorliegenden Erfindung, die oben genannten Nachteile zu vermeiden und eine optimale Absaugung bei einer Rotationsschleifmaschine bereitzustellen, die zudem ein punktgenaues Arbeiten ermöglicht.It is therefore the object of the present invention to avoid the above-mentioned disadvantages and to provide optimal suction in a rotary grinding machine, which also allows a pinpoint working.
Die oben genannte Aufgabe wird gelöst durch eine Schleiftellereinheit für eine Rotationsschleifmaschine gemäß Anspruch 1 sowie durch die Verwendung einer Schleiftellereinheit mit perforierten klettbaren Schleifscheiben gemäß Anspruch 11.The abovementioned object is achieved by a grinding plate unit for a rotary grinding machine according to
Die erfindungsgemäße Schleiftellereinheit weist eine integrierte Absaugeinrichtung in Form einer Absaughaube auf, welche unmittelbar an der Antriebswelle des Schleiftellers drehbar befestigt ist. Der Schleifteller weist Absaugöffnungen auf, die den Schleifteller durchdringen und über die der Rückseite des Schleiftellers mittels der Absaughaube Staub durch die Schleifscheibe hindurch abgesaugt werden kann. Da die Absaughaube an der Antriebswelle drehbar befestigt ist, ergibt sich eine integrierte Schleiftellereinheit, welche unabhängig von der jeweiligen verwendeten Rotationsschleifmaschine einsetzbar ist. Die Verbindung zwischen der Schleiftellereinheit und der Rotationsschleifmaschine erfolgt lediglich über die Antriebswelle, welche an einer Werkzeugaufnahme der Rotationsschleifmaschine angeschraubt wird. Dementsprechend können Rotationsschleifmaschinen ohne Absaugung mit einer Schleiftellereinheit mit integrierter Absaugung nachgerüstet werden.The grinding plate unit according to the invention has an integrated suction device in the form of a suction hood which is rotatably mounted directly on the drive shaft of the grinding plate. The sanding pad has suction openings, which penetrate the sanding pad and over which the back of the sanding pad can be sucked through the sanding disk by means of the dust extraction hood. Since the suction hood is rotatably mounted on the drive shaft, there results an integrated sanding pad unit which can be used independently of the particular rotary grinding machine used. The connection between the sanding pad unit and the rotary grinding machine takes place only via the drive shaft, which is screwed to a tool holder of the rotary grinding machine. Accordingly, rotary sanding machines without suction can be retrofitted with a sanding unit with integrated suction.
Da die Absaughaube an der Rückseite des Schleiftellers angeordnet ist, kann über sie eine Staubabsaugung durch den Schleifteller hindurch erfolgen. Der Staub wird daher unmittelbar an der Schleifoberfläche abgesaugt und muss nicht erst von der Schleifscheibe nach außen geschleudert werden, um außerhalb der Schleifscheibe durch eine überstehende Haube abgesaugt zu werden. Damit verbessert sich einerseits die Staubabsaugung andererseits erhöht sich hierbei die Standzeit der Schleifscheiben, da sie sich weniger schnell zusetzen. Weiterhin ergibt sich der Vorteil, dass der Rand der Schleifscheibe jederzeit einsehbar ist und somit ein punktgenaues Schleifen ermöglicht wird.Since the suction hood is arranged on the rear side of the sanding pad, dust extraction through the sanding pad can take place via it. The dust is therefore sucked off directly at the grinding surface and does not first have to be thrown outwards by the grinding wheel in order to be sucked off outside the grinding wheel by a projecting hood. On the one hand improves the dust extraction on the other hand, this increases the service life of the grinding wheels, as they clog less quickly. Furthermore, there is the advantage that the edge of the grinding wheel is visible at any time and thus a pinpoint grinding is possible.
Bevorzugt ist die Schleiftellereinheit als eine nachrüstbare Schleiftellereinheit ausgebildet, die universell zusammen mit beliebigen Rotationsschleifern verwendet werden kann. Damit können beliebige Rotationsschleifer zum staubfreien Schleifen mit einer erfindungsgemäßen Schleiftellereinheit ausgerüstet werden.The sanding pad unit is preferably designed as a retrofittable sanding pad unit which can be used universally together with any rotary sanders. Thus, any rotary grinder for dust-free grinding can be equipped with a grinding disc unit according to the invention.
Bevorzugt stellt die Antriebswelle die einzige notwendige Verbindung der Schleiftellereinheit mit einer Rotationsschleifmaschine dar, sodass die Schleiftellereinheit maschinenunabhängig ausgebildet ist. Die einzige notwendige Verbindung der Schleiftellereinheit mit der Rotationsschleifmaschine erfolgt am Anschlussflansch der Rotationsschleifmaschine, an den die Schleiftellereinheit anstatt den üblicherweise verwendeten gewöhnlichen Schleiftellern angeschraubt werden. Weitere Verbindungsmöglichkeiten zwischen Schleiftellereinheit und Rotationsschleifmaschine sind nicht notwendig.The drive shaft preferably represents the only necessary connection of the sanding pad unit with a rotary grinding machine, so that the sanding pad unit is designed to be machine-independent. The only necessary connection of the sanding pad unit with the rotary grinding machine takes place at the connection flange of the rotary grinding machine, to which the sanding pad unit is screwed instead of the usually used sanding pads. Further connection possibilities between sanding pad unit and rotary grinding machine are not necessary.
Bevorzugt ist die Ansaughaube kein Teil einer Rotationsschleifmaschine und/oder ist die Ansaughaube nicht direkt mit der Rotationsschleifmaschine verbindbar. Die Ansaughaube ist, im Gegensatz zum Stand der Technik, ein integraler Bestandteil der Schleiftellereinheit und kein Teil einer Rotationsschleifmaschine, sodass die Schleiftellereinheit maschinenunabhängig verwendet werden kann. Insbesondere kann die Rotationsschleifmaschine mit Schleiftellereinheiten unterschiedlicher Größe ausgerüstet werden, für die jeweils eine optimale Absaugung des Schleifstaubs gewährleistet ist.The suction hood is preferably not part of a rotary grinding machine and / or the suction hood can not be connected directly to the rotary grinding machine. The suction hood is, in contrast to the prior art, an integral part of the sanding pad unit and not part of a rotary grinding machine, so that the sanding pad unit can be used independently of the machine. In particular, the rotary grinding machine can be equipped with sanding pad units of different sizes, for each of which an optimal extraction of the grinding dust is guaranteed.
Bevorzugt ist die Absaughaube über ein Drehlager, insbesondere ein Kugellager an der Antriebswelle befestigt. Damit braucht die Absaughaube keine weitere Befestigung, insbesondere nicht an der Rotationsschleifmaschine. Bevorzugt wird ein abgedichtetes Kugellager zur Befestigung der Absaughaube an der Antriebswelle eingesetzt.The suction hood is preferably fastened to the drive shaft via a rotary bearing, in particular a ball bearing. Thus, the suction hood needs no further attachment, especially not on the rotary grinder. Preferably, a sealed ball bearing is used for fastening the suction hood to the drive shaft.
Die Absaughaube ist so ausgestaltet, dass der äußere Rand des Schleiftellers im Betrieb sichtbar bleibt. Damit ist ein punktgenaues Schleifen und eine optimale Kontrolle des Schleifergebnisses gewährleistet. Die Absaughaube behindert auch nicht den Anwender beim Schleifen bis zu Kanten, etc..The suction hood is designed so that the outer edge of the sanding pad remains visible during operation. This ensures precise grinding and optimal control of the grinding result. The suction hood also does not hinder the user when grinding up to edges, etc.
Bevorzugt weist die Absaughaube an ihrem, dem Schleifteller zugewandten Rand einen Bürstenkranz oder einen Gleitring auf. Der Bürstenkranz oder der Gleitring ermöglicht eine Rotation des Schleiftellers bezüglich einer still stehenden Absaughaube und sorgt gleichzeitig für eine gute Abdichtung zwischen diesen beiden Teilen, um den erzeugten Unterdruck in der Absaughaube möglichst vollständig für die Staubabsaugung durch die Schleifscheibe hindurch zu nutzen. Bevorzugt weist die Absaughaube einen Anschlussstutzen für einen Schlauch einer Staubabsaugeinrichtung auf. An den Anschlussstutzen der Absaughaube wird üblicherweise ein Industriestaubsauger angeschlossen, welcher den Staub, der beim Schleifen entsteht, absaugt und aufnimmt. Gleichzeitig verhindert der Schlauch, dass sich die Absaughaube durch die verbleibende Reibung im Drehlager mit dem Schleifteller mitdreht.The suction hood preferably has a brush ring or a sliding ring on its edge facing the sanding pad. The brush ring or the sliding ring allows a rotation of the sanding plate with respect to a stationary suction hood and at the same time ensures a good seal between these two parts in order to use the generated negative pressure in the exhaust hood as completely as possible for the dust extraction through the grinding wheel. The suction hood preferably has a connecting piece for a hose of a dust extraction device. An industrial vacuum cleaner is usually connected to the connecting piece of the extraction hood, which sucks and absorbs the dust that forms during grinding. At the same time, the hose prevents the suction hood from rotating with the sanding pad due to the remaining friction in the pivot bearing.
Bevorzugt weist die Antriebswelle ein Gummielement auf. Damit wird ein verkanten des Schleiftellers ausgeglichen und sichergestellt, dass die Schleifscheibe wenn gewünscht immer plan auf dem Werkstück aufliegt und somit keine Schleifriefen verursacht werden.Preferably, the drive shaft on a rubber element. This compensates for a tilting of the sanding disk and ensures that the sanding disk always rests flat on the workpiece, if desired, and thus no sanding marks are caused.
Bevorzugt weist die Absaughaube an ihrem Mantel einen Faltenbalg auf. Der Faltenbalg gleicht leichte Winkelunterschiede zwischen Absaughaube und dem Schleifteller aus und gewährleitstet eine gute Abdichtung zwischen diesen Bauelementen.The suction hood preferably has a bellows on its jacket. The bellows compensates for slight differences in angle between the extraction hood and the sanding pad and ensures a good seal between these components.
Der Schleifteller ist erfindungsgemäß auf der Vorderseite mit einer Klettschicht zur Befestigung von klettbaren Schleifscheiben versehen. Durch die Klettschicht erfolgt eine einfache und mechanisch sichere Befestigung von klettbaren Schleifscheiben und andererseits können perforierte Schleifscheiben verwendet werden, bei denen der Staubtransport auf der Rückseite der Schleifscheiben durch die Klettschichten stattfindet. In diesem Fall können die Absaugöffnungen im Schleifteller an den verfahrenstechnisch optimalen Positionen angeordnet werden und müssen nicht mit etwaigen Öffnungen in der Schleifscheibe übereinstimmen.The sanding pad is inventively provided on the front with a Velcro layer for attachment of velcro sanding wheels. The Velcro layer provides a simple and mechanically secure attachment of wheeled grinding wheels and on the other hand, perforated grinding wheels can be used, in which the dust transport takes place on the back of the grinding wheels through the Velcro layers. In this case, the suction openings in the sanding pad can be arranged at the optimal procedural positions and do not have to coincide with any openings in the grinding wheel.
Die Absaugöffnungen sind erfindungsgemäß zumindest im Bereich des äußeren Rands des Schleiftellers angeordnet. Durch die hohen Drehzahlen des Schleiftellers beim Schleifen wird Staub aufgrund der Fliehkraft nach außen geschleudert - insbesondere bei einem Staubtransport in den Klettschichten - und dann außen an der Schleifscheibe durch die dort angeordneten Absaugöffnungen am Rand des Schleiftellers abgesaugt. Damit ist sichergestellt, dass auch Schleifstaub, der am Rand des Schleiftellers entsteht, nicht nach außen weggeschleudert wird, sondern sicher abgesaugt wird.The suction openings are arranged according to the invention at least in the region of the outer edge of the sanding pad. Due to the high rotational speeds of the sanding disc during sanding, dust is thrown outward due to the centrifugal force - especially in the case of dust transport in the Velcro layers - and then sucked out on the grinding wheel by the suction openings arranged there at the edge of the sanding disc. This ensures that even sanding dust, which is produced at the edge of the sanding pad, is not thrown outwards, but is safely extracted.
In einer bevorzugten Ausführungsform sind die Absaugöffnungen so am Rand des Schleiftellers angeordnet, dass in radialer Richtung gesehen am gesamten Umfang des Schleiftellers stets Absaugöffnungen vorhanden sind. Damit ist sichergestellt, dass Staub, welcher sich aufgrund der Fliehkraft in radialer Richtung aus der Mitte der Schleifscheibe nach außen zum Rand hin bewegt, stets auf eine Absaugöffnung am Rand des Schleiftellers trifft und durch diese abgesaugt wird. In radialer Richtung gesehen sind daher keine Lücken zwischen Absaugöffnungen vorhanden, durch die Staub nach außen herausgeschleudert werden könnte ohne abgesaugt zu werden.In a preferred embodiment, the suction openings are arranged on the edge of the sanding pad so that suction openings are always present in the radial direction on the entire circumference of the sanding pad. This ensures that dust, which moves due to the centrifugal force in the radial direction from the center of the grinding wheel outwards to the edge, always meets a suction opening at the edge of the grinding disc and is sucked through it. Seen in the radial direction, therefore, there are no gaps between suction openings through which dust could be thrown outwards without being sucked off.
Ein bevorzugter Schleifteller für eine Rotationsschleifinaschine, weist Absaugöff nungen auf, die den Schleifteller durchdringen, wobei die Absaugöffnungen so am Rand des Schleiftellers angeordnet sind, dass in radialer Richtung gesehen am gesamten Umfang des Schleiftellers stets Absaugöffnungen vorhanden sind. Beim Schleifen entstehender Staub, der durch Öffnungen, insbesondere Perforationsöffnungen, in der Schleifscheibe in die Klettschichten hinter der Schleifebene eintritt und dann radial durch die Fliehkräfte nach außen sich bewegt, trifft auf diesem Weg am Rand des Schleiftellers stets auf eine Ansaugöffnung, durch die der Staub nach hinten durch den Schleifteller hindurch abgesaugt wird. Dementsprechend kann kein Staub mehr von der Schleifscheibe nach außen geschleudert werden und die Umwelt belasten.A preferred sanding pad for a rotary grinding machine, has Absaugöff openings, which penetrate the sanding pad, wherein the suction openings are arranged on the edge of the sanding pad that seen in the radial direction on the entire circumference of the sanding pad suction always exist. During grinding resulting dust that enters through openings, especially perforations, in the grinding wheel in the Velcro layers behind the loop plane and then moves radially through the centrifugal forces outwards, meets on this way at the edge of the sanding pad always on a suction through which the dust is sucked through the back through the sanding pad. Accordingly, dust from the grinding wheel can no longer be thrown outwards and pollute the environment.
Bevorzugt sind die Absaugöffnungen als gekrümmte, sich gegenseitig überlappende Schlitze ausgebildet. Es hat sich herausgestellt, dass relativ schmale, gekrümmte, sich gegenseitig überlappende Schlitze am Rand des Schleiftellers eine optimale Absaugung des Schleifstaubs insbesondere bei perforierten Schleifscheiben gewährleisten.Preferably, the suction openings are formed as curved, mutually overlapping slots. It has been found that relatively narrow, curved, mutually overlapping slots on the edge of the sanding pad ensure optimum extraction of the sanding dust, especially with perforated grinding wheels.
Erfindungsgemäß ist der Rand des Schleiftellers an der Vorderseite abgerundet. Damit übt die auf dem Schleifteller befestigte Schleifscheibe beim Schleifen am Rand einen geringeren Druck aus, als weiter innen. Dies ist insoweit vorteilhaft, da dann der Rand der Schleifscheibe keine Schleifspuren hinterlässt, was insgesamt, insbesondere beim Fein- und Polierschliff, ein besseres Schleifergebnis ergibt. Weiterhin kann mit einem abgerundeten Rand des Schleiftellers auch Aufkantungen mit einer abgerundeten Kehle geschliffen werden. Hierzu ist insbesondere die erfindungsgemäße Schleiftellereinheit in der Lage, da sie - im Gegensatz zu einem Exzenterschleifer - keinen Exzenterhub verwendet sondern eine reine Rotationsbewegung. Somit kann mit dem Rand des Schleiftellers in Kanten reingeschliffen werden.According to the edge of the grinding plate is rounded at the front. Thus, the sanding disc mounted on the sanding pad exerts a lower pressure during sanding than at the edge. This is advantageous insofar as the edge of the grinding wheel leaves no grinding marks, which results in a better grinding result overall, in particular during fine and polishing grinding results. Furthermore, with a rounded edge of the sanding plate also edging be ground with a rounded throat. For this purpose, in particular the sanding pad unit according to the invention is able, since it - in contrast to an eccentric grinder - does not use an eccentric stroke but a pure rotational movement. Thus, can be ground into edges with the edge of the sanding plate.
Erfindungsgemäß ist der Rand des Schleiftellers zu einer Mantelfläche verbreitert. Auch dies ermöglicht ein qualitativ optimales und schnelles Schleifen einer Kante oder Hohlkehle eines Werkstücks, wobei ein genauer Radius der Hohlkehle ausgebildet werden kann. Auch dies ist mit Exzenterschleifern nicht möglich.According to the invention, the edge of the sanding plate is widened to form a lateral surface. This also allows a qualitatively optimal and fast grinding of an edge or groove of a workpiece, wherein a precise radius of the groove can be formed. Again, this is not possible with eccentric grinders.
In einer weiteren bevorzugten Ausführungsform ist die Mantelfläche des Schleiftellers mit Absaugöffnungen durchbrochen. Damit kann auch der Staub, der sich beim Schleifen an der Mantelfläche des Schleiftellers bildet, durch die Schleifscheibe hindurch abgesaugt werden.In a further preferred embodiment, the lateral surface of the sanding plate is broken with suction. Thus, the dust that forms during grinding on the lateral surface of the sanding pad can be sucked through the grinding wheel through.
Ein weiterer Aspekt der vorliegenden Erfindung betrifft die Verwendung einer Schleiftellereinheit gemäß einem der Ansprüche 1-10 mit perforierten, klettbaren Schleifscheiben. Die oben genannten Vorteile der erfindungsgemäßen Schleiftellereinheit werden insbesondere bei der Verwendung zusammen mit perforierten klettbaren Schleifscheiben bereitgestellt, bei denen Staub, der beim Schleifen entsteht, auf kürzestem Weg durch Perforationsöffnungen in der Schleifscheibe von der Schleiffläche nach hinten in die Klettschichten abgeführt wird, und dort zu den Absaugöffnungen im Schleifteller gesaugt wird und dann durch den Schleifteller hindurch abgesaugt wird. Somit können perforierte Schleifscheiben vorteilhafterweise nun auch mit Rotationsschleifmaschinen verwendet werden, welche eine wesentliche höhere Abtragsleistung verglichen mit oszillierenden Schleifmaschinen aufweisen.Another aspect of the present invention relates to the use of a sanding pad assembly according to any of claims 1-10 with perforated, grindable grinding wheels. The abovementioned advantages of the sanding pad unit according to the invention are provided, in particular, when used together with perforated, slidable grinding wheels, in which dust which forms during grinding is removed by the shortest route through perforation openings in the grinding wheel from the grinding surface to the back into the Velcro layers, and there the suction holes in the sanding pad is sucked and then sucked through the sanding pad through. Thus, perforated grinding wheels can be advantageously used now also with rotary grinding machines, which have a significantly higher removal rate compared to oscillating grinding machines.
Weitere bevorzugte Ausführungsformen der Erfindung sind in den Unteransprüchen beschrieben.Further preferred embodiments of the invention are described in the subclaims.
Im Folgenden werden bevorzugte Ausführungsformen von Schleiftellereinheiten anhand der begleitenden Zeichnungen beschrieben, in denen zeigt:
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Fig. 1 eine teilweise geschnittene Seitenansicht einer nicht erfindungsgemäßen Ausführungsform einer Schleiftellereinheit; -
Fig. 2 eine Detailansicht A der Schleiftellereinheit gemäßFig. 1 ; -
Fig. 3 eine dreidimensionale Ansicht einer nicht erfindungsgemäßen Ausführungsform einer Schleiftellereinheit mit Blick auf die Absaughaube und Antriebswelle; -
Fig. 4 die Schleiftellereinheit gemäßFig. 3 mit Blick auf den Schleifteller; -
Fig. 5 eine Explosionsansicht der Bauelemente der Schleiftellereinheit gemäßFig. 1 ; -
Fig. 6 eine Ausführungsform eines nicht erfindungsgemäßen Schleiftellers mit Absaugöffnungen am Rand des Schleiftellers; -
Fig. 7A - C Ausführungsformen nicht erfindungsgemäßer Schleifteller mit verschiedenen unterschiedlichen Absaugöffnungen; -
Fig. 8 eine schematische Ansicht einer nicht erfindungsgemäßen Schleiftellereinheit befestigt an einem Winkelschleifer; -
Fig. 9 eine teilweise geschnittene Seitenansicht einer nicht erfindungsgemäßen Ausführungsform einer Schleiftellereinheit; und -
Fig. 10A - E Ausführungsformen von perforierten Schleifscheiben; -
Fig. 11 ein Teilschnitt einer weiteren Ausführungsform eines erfindungsgemäßen Schleiftellers mit abgerundetem Tellerrand; -
Fig. 12 eine Ansicht von unten auf einen Schleifteller gemäßFig. 11 ; -
Fig. 13 eine dreidimensionale Ansicht eines Schleiftellers gemäßFig. 11 ; -
Fig. 14 eine Seitenansicht eines Schleiftellers gemäßFig. 11 mit einer ebenen Schleifscheibe; -
Fig. 15 eine Seitenansicht einer weiteren Ausführungsform einer erfindungsgemäßen Schleiftellers mit abgerundetem Tellerrand mit einer Schleifscheibe bei der Bearbeitung einer Aufkantung; und -
Fig. 16 eine dreidimensionale Ansicht einer weiteren Ausführungsform einer erfindungsgemäßen Schleiftellereinheit.
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Fig. 1 a partially sectioned side view of a non-inventive embodiment of a sanding pad unit; -
Fig. 2 a detailed view A of the sanding pad unit according toFig. 1 ; -
Fig. 3 a three-dimensional view of a non-inventive embodiment of a sanding pad unit with a view of the suction hood and drive shaft; -
Fig. 4 the sanding pad unit according toFig. 3 with a view of the sanding plate; -
Fig. 5 an exploded view of the components of the sanding pad according toFig. 1 ; -
Fig. 6 an embodiment of a non-inventive sanding plate with suction at the edge of the sanding plate; -
FIGS. 7A-C Embodiments not inventive sanding plate with different different suction holes; -
Fig. 8 a schematic view of a non-inventive sanding pad unit attached to an angle grinder; -
Fig. 9 a partially sectioned side view of a non-inventive embodiment of a sanding pad unit; and -
10A-E Embodiments of perforated grinding wheels; -
Fig. 11 a partial section of another embodiment of a grinding plate according to the invention with rounded Tellerrand; -
Fig. 12 a view from below of a sanding pad according toFig. 11 ; -
Fig. 13 a three-dimensional view of a sanding pad according toFig. 11 ; -
Fig. 14 a side view of a sanding pad according toFig. 11 with a flat grinding wheel; -
Fig. 15 a side view of another embodiment of a grinding plate according to the invention with rounded Tellerrand with a grinding wheel in the processing of a raised edge; and -
Fig. 16 a three-dimensional view of another embodiment of a sanding pad unit according to the invention.
Im Folgenden werden bevorzugte Ausführungsformen der vorliegenden Erfindung mithilfe der begleitenden Figuren beschrieben. Merkmale einzelner Ausführungsformen können auch mit anderen Ausführungsformen kombiniert werden.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Features of individual embodiments may also be combined with other embodiments.
Die
Wie insbesondere in
Die Antriebswelle 20 weist an ihrem oberen Ende eine Bohrung 24 mit einem Innengewinde auf, die an einer Werkzeugaufnahme 110 einer Rotationsschleifmaschine 100 durch Aufschrauben befestigbar ist. Auf diese Weise kann die Schleiftellereinheit 1 mit einer Rotationsschleifmaschine 100 verbunden werden, die keine besonderen Gestaltungsmerkmale für eine Absaugung aufweisen muss. Die Schleiftellereinheit 1 eignet sich daher zur Nachrüstung gewöhnlicher Rotationsschleifmaschinen 100 ohne Absaugung, sodass auch mit derartigen Maschinen ein staubfreies Schleifen durchgeführt werden kann. Die einzige notwendige Verbindung der Schleifteileeinheit 1 mit der Rotationsschleifmaschine 100 wird über die Antriebswelle 20 hergestellt, sodass die Schleiftellereinheit 1 maschinenunabhängig mit beliebigen Rotationsschleifern 100 verwendet werden kann. In
Die vorliegende Erfindung ist nicht auf handgeführte Rotationsschleifer, wie den Winkelschleifer der
Um eine möglichst gute Absaugung zu gewährleisten, ist zwischen der fest stehenden Absaughaube 30 und dem im Betrieb sich drehenden Schleifteller 10 in der ersten Ausführungsform ein Bürstenkranz 32 an der Absaughaube 30 befestigt, der den notwendigen Spalt zwischen Absaughaube 30 und Schleifteller 10 abdichtet.In order to ensure the best possible suction, a
Der Schleifteller 10 besteht bevorzugt aus einer dünnen Platte, beispielsweise einer 2 - 4 mm dicken Aluminiumplatte, in die Absaugöffnungen 16 eingebracht sind. Im Betrieb tritt der an der Schleiffläche entstehende Schleifstaub durch die Absaugöffnungen 16 im Schleifteller 10 hindurch und wird durch den Unterdruck innerhalb der Absaughaube 30 über den Absaugstutzen 34 von den Absaugeinrichtungen (Schlauch 120 und Industriestaubsauger) abgesaugt.The
Wie in
Zur Staubabsaugung sind derartige klettbare Schleifscheiben 130 mit Öffnungen versehen, durch die der Schleifstaub, der an der Schleiffläche entsteht, abgesaugt werden kann. Grundsätzlich gibt es zwei verschiedene Arten von Schleifscheiben für Absaugeinrichtungen, nämlich Schleifscheiben mit wenigen relativ großen Absaugöffnungen, die mit entsprechenden Absaugöffnungen im Schleifteller 10 in Übereinstimmung gebracht werden. Derartige Schleifscheiben haben jedoch den Nachteil, dass der Weg des Schleifkorns an der Schleifoberfläche bis zu der entsprechenden Absaugöffnung relativ lang ist und sich daher derartige Schleifscheiben relativ schnell zusetzen und unbrauchbar werden.For dust extraction such
Daneben gibt es sogenannte perforierte Schleifscheiben 130, welche eine Perforation aus kleinen Perforationsöffnungen 132 aufweisen, die im Wesentlichen über die gesamte Oberfläche der Schleifscheibe 130 verteilt sind. Beispielhafte Schleifscheiben 130 mit derartigen Perforationsöffnungen 132, die im Wesentlichen über die gesamte Oberfläche der Schleifscheibe 130 verteilt sind, sind in den
Derartige perforierte Schleifscheiben 130 gewährleisten einen vollflächigen Staubabtransport über im Wesentlichen die gesamte Fläche der Schleifscheibe 130. Der Schleifstaub wird durch den vorherrschenden Unterdruck durch jede Perforationsöffnung 132 abgesaugt, tritt durch die Unterlage hindurch und in die Klettschichten hinein. Dort fließt der Staub in der Klettschicht bis zu den Absaugöffnungen 16 im Schleifteller 10, durch die hindurch er abgesaugt wird. Der Staubtransport findet daher auf der Rückseite der Schleifscheibe in der Klettadaptionsschicht und in der Kletthakenschicht statt. Bei derartigen Schleifscheiben 130 ist es nicht notwendig, ein exakt passendes Lochmuster im Schleifteller 10 vorzusehen. Insgesamt sind die Standzeit und das Schleifergebnis bei derartigen perforierten Schleifscheiben 130 um ein Vielfaches höher als bei gewöhnlichen Schleifscheiben mit wenigen großen Absauglöchern. Man erkennt aus den Mustern der Perforationsöffnungen 132 der
Um im vorliegenden Fall für einen Rotationsschleifer 100 eine optimale Absaugung des Staubs zu ermöglichen, wird für perforierte Schleifscheiben 130 ein Schleifteller 10 mit einer bestimmten Anordnung der Absaugöffnungen 16, 17 vorgeschlagen. Durch die hohen Drehzahlen des Schleiftellers 10 im Betrieb wird der Staub aufgrund der Zentrifugalkraft radial nach außen befördert. Um ein möglichst staubfreies Schleifen zu gewährleisten, sollten daher die Absaugöffnungen 16, 17 nahe des Randes 18 des Schleiftellers 10 angeordnet sein, damit Staub der dort entsteht sicher entgegen der Zentrifugalkraft abgesaugt werden kann. Staub der im inneren Bereich der Schleifscheibe 130 entsteht, wandert zwangsläufig nach außen Richtung Rand 18 und wird dann dort ebenfalls abgesaugt. Bevorzugte Muster für Absaugöffnungen 16, 17 sind in den
Besonders bevorzugt ist ein Muster gemäß
Selbstverständlich kann die Form und Anordnung der sich überlappenden Absaugöffnungen 16, 17 je nach Größe des Schleiftellers oder Ausführungsform variiert werden. Wichtig ist jedoch, dass von innen nach außen gesehen am Rand keine Lücken zwischen den Absaugöffnungen vorhanden sind, durch die der Staub nach außen austreten könnte. Zumindest sollten die Lücken nicht so groß sein, dass die Zentrifugalkräfte, die auf den Staub wirken, größer sind als die Kräfte durch die Absaugwirkung. Der beim Schleifen entstehende Staub tritt aufgrund der Absaugwirkung durch die Perforationsöffnungen 132 durch die Unterlage der Schleifscheibe 130 hindurch und in die Klettschichten hinter der Schleifebene ein, wird dann durch die Saugluft und die Zentrifugalkraft radial nach außen befördert und dann durch eine der Absaugöffnungen 16, 17, die sich zumindest am Rand 18 des Schleiftellers 10 befinden, in die Absaughaube 30 hinein abgesaugt. Von dort wird der Staub den Absaugstutzen 34 und den Saugschlauch 120 in eine Absaugeinrichtung (beispielsweise einen Industriestaubsauger) abgesaugt. Damit ist mit der Schleiftellereinheit 1 ein nahezu staubfreies Schleifen möglich.Of course, the shape and arrangement of the overlapping
Weitere Designs für bevorzugte Absaugöffnungen sind in den
In
Ein Gleitring 37 bevorzugt aus einem Kunststoffmaterial wie beispielsweise Teflon verringert die Reibung zwischen der Absaughaube 30, die bevorzugt auch aus einem Kunststoffinaterial hergestellt ist, und dem Schleifteller 10. Der Faltenbalg 38 drückt den Gleitring 37 gegen den Schleifteller 10.A sliding
Die Schleifscheiben 130 der
Die
Im Gegensatz zum Schleif teller 10 der
Der Rand 19 des Schleiftellers 10 ist zudem nach oben hochgezogen, wie in den
Genauso wie die Schleifteller 10 der
Wie in
Der Schleifteller 10 weist weiterhin eine Öffnung 52 zur Befestigung mit einer Schraube 50 an der Antriebswelle 20 auf.The
Die
Verglichen mit den Schleiftellereinheiten der
- 11
- SchleiftellereinheitGrinding plate unit
- 1010
- Schleiftellersanding pad
- 1212
- Vorderseitefront
- 1313
- KlettschichtVelcro layer
- 1414
- Rückseiteback
- 16, 16'16, 16 '
- Absaugöffnungensuction
- 17, 17'17, 17 '
- schlitzförmige Absaugöffnungenslit-shaped suction openings
- 1818
- Randbereich des SchleiftellersEdge area of the sanding plate
- 1919
- äußerer Rand des Schleiftellersouter edge of the sanding plate
- 19'19 '
- abgerundeter Rand des Schleiftellersrounded edge of the sanding plate
- 19"19 "
- Mantelfläche des SchleiftellersLateral surface of the sanding plate
- 2020
- Antriebswelledrive shaft
- 2222
- Anschlagringstop ring
- 2424
- Bohrung mit InnengewindeBore with internal thread
- 2626
- Gummielementrubber element
- 3030
- Absaughaubeexhaust hood
- 3232
- Bürstenkranzbrush ring
- 3434
- Absaugstutzensuction
- 3636
- Lageraufnahmebearing seat
- 3737
- Gleitringsliding ring
- 3838
- Faltenbalgbellow
- 3939
- Mantelcoat
- 4040
- Rotationslager, KugellagerRotary bearings, ball bearings
- 5050
- Schraubescrew
- 5252
- Öffnung für SchraubeOpening for screw
- 6060
- WellensicherungsringCirclip
- 7070
- WellensicherungsringCirclip
- 100100
- Rotationsschleifmaschinerotary sander
- 110110
- Werkzeugaufnahmetool holder
- 120120
- Absaugschlauchsuction hose
- 130130
- Schleifscheibegrinding wheel
- 130'130 '
- am Rand hochgezogene Schleifscheibeat the edge raised grinding wheel
- 132132
- Perforationsöffnungenperforation
- 200200
- Werkstückworkpiece
- 202202
- Aufkantung oder HohlkehleUpstand or fillet
Claims (11)
- Grinding disc unit (1) for a rotary grinding machine (100), comprising:a) a grinding disc (10) comprising a front face (12) with a hook-and-loop layer (13) for attachment of a hook-and-loop enabled grinding pad (130) and a rear side (14) opposite to the front side (12);b) a drive shaft (20) of the grinding disc (10) mountable to a tool holder (110) of the rotary grinding machine (100); andc) an extraction hood (30); whereind) the extraction hood (30) is arranged for a dust hoovering through the grinding disc (10) therethrough to the back (14) of the grinding disc (10) and comprises a casing (39); whereine) the frame (19') of the grinding disc (10) is rounded at the front face and broadened towards an upward standing casing surface (19"), and whereinthe grinding disc unit (1) is characterized in thatf) the grinding disc (10) comprises at least at its frame (18) extraction openings (16, 17) which penetrate the grinding disc (10);g) the extraction hood (30) is pivotable mounted at the drive shaft (20);h) the diameter of the casing surface (19") of the grinding disc (10) is slightly larger than the diameter of the casing (39) of the extraction hood (30), andi) the casing (39) of the extraction hood (30) engages from above into the grinding disc (10) with the upward standing casing surface (19") and seals against the grinding disc.
- Grinding disc unit according to claim 1, wherein the drive shaft (20) is the only necessary connection of the grinding disc unit (1) with the rotary grinding machine (100) and thus the grinding disc unit (1) is formed independent of any machine.
- Grinding disc unit according to one of claims 1 or 2, wherein the extraction hood (30) is not a part of the rotary grinding machine (100) and/or wherein the extraction hood (30) is not directly connectable to the rotary grinding machine (100).
- Grinding disc unit according to one of claims 1 - 3, wherein the extraction hood (30) is mounted via a pivot bearing (40), in particular a ball bearing (40), to the drive shaft (20).
- Grinding disc unit according to one of claims 1 - 4, wherein the extraction hood (30) comprises a brush rim (32) or a sliding ring (37) at its frame facing the grinding disc (10).
- Grinding disc unit according to one of claims 1 - 5, wherein the extraction hood (30) comprises a connecting piece (34) for a hose (120) of a dust hoovering device.
- Grinding disc unit according to one of claims 1 - 6, wherein the drive shaft (20) comprises a rubber element (26) and/or wherein the extraction hood (30) comprises a gaiter (38) at its casing.
- Grinding disc unit according to one of claims 1 - 7, wherein the extraction openings (16, 17) are arranged at the frame (18) of the grinding disc (10) such that, seen in radial direction from the inner to the outer side, extraction openings (16, 17) are always available at the entire periphery of the grinding disc (10), so that dust, moving radially from the inside to the outside due to the centrifugal force, always meets an extraction opening (16, 17) at the frame of the grinding disc (10) and is hoovered to the back through the grinding disc (10).
- Grinding disc unit (1) according to one of the claims 1 - 8, wherein the extraction openings (17) are formed as curved slots (17, 17') arranged in such a way that, seen from the inner to the outer side, there are no gaps between the extraction openings (16, 17) at the frame of the grinding disc (10).
- Grinding disc unit (1) according to one of the claims 1 - 9, wherein the casing surface (19") is perforated by extraction openings (16').
- Use of a grinding disk unit (1) according to one of the claims 1 - 10 with perforated, hook-and-loop enabled grinding pads (130), comprising a perforation of small perforation openings which are arranged substantially over the entire surface of the grinding pad (130) and in which the dust transport takes place on the rear side of the grinding pads (130) through the hook-and-loop layers.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL11748385T PL2611573T3 (en) | 2010-08-31 | 2011-08-24 | Grinding wheel unit for a rotary grinding machine |
EP11748385.9A EP2611573B1 (en) | 2010-08-31 | 2011-08-24 | Grinding wheel unit for a rotary grinding machine |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10174588A EP2422931A1 (en) | 2010-08-31 | 2010-08-31 | Universal grinding plate unit with suction hood for a rotating grinding machine |
PCT/EP2011/064526 WO2012028505A1 (en) | 2010-08-31 | 2011-08-24 | Grinding wheel unit for a rotary grinding machine |
EP11748385.9A EP2611573B1 (en) | 2010-08-31 | 2011-08-24 | Grinding wheel unit for a rotary grinding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2611573A1 EP2611573A1 (en) | 2013-07-10 |
EP2611573B1 true EP2611573B1 (en) | 2017-03-01 |
Family
ID=43501597
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10174588A Ceased EP2422931A1 (en) | 2010-08-31 | 2010-08-31 | Universal grinding plate unit with suction hood for a rotating grinding machine |
EP11748385.9A Active EP2611573B1 (en) | 2010-08-31 | 2011-08-24 | Grinding wheel unit for a rotary grinding machine |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10174588A Ceased EP2422931A1 (en) | 2010-08-31 | 2010-08-31 | Universal grinding plate unit with suction hood for a rotating grinding machine |
Country Status (6)
Country | Link |
---|---|
US (1) | US9132527B2 (en) |
EP (2) | EP2422931A1 (en) |
CN (1) | CN103068524A (en) |
ES (1) | ES2619591T3 (en) |
PL (1) | PL2611573T3 (en) |
WO (1) | WO2012028505A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102015101169A1 (en) * | 2015-01-27 | 2016-07-28 | Polirtlak D.O.O. | Grinding dust extractor |
EP3275594A1 (en) * | 2016-07-29 | 2018-01-31 | Guido Valentini | Backing plate unit |
CN106426437B (en) * | 2016-11-18 | 2018-07-27 | 遵义市华龙工贸有限公司 | A kind of burr remover for plank |
US10434628B2 (en) | 2017-06-26 | 2019-10-08 | X'pole Precision Tools Inc. | Grinding machine |
EP3421173B8 (en) | 2017-06-27 | 2022-08-17 | X'Pole Precision Tools Inc. | Grinding machine |
CN108115560A (en) * | 2017-12-15 | 2018-06-05 | 广东五月花网络科技有限公司 | A kind of diamond abrasive tool of fixed cutter head |
JP6684006B1 (en) * | 2019-07-31 | 2020-04-22 | 株式会社丸高工業 | Dust cover for power tools and power tools |
DE102020125135A1 (en) | 2020-09-25 | 2022-03-31 | Jöst Gmbh | Grinding wheel, grinding device and use of a grinding wheel |
CN112518598B (en) * | 2020-12-23 | 2023-10-03 | 郑州宏拓磨具制造有限公司 | Grinding wheel |
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EP1291134A1 (en) * | 2001-09-08 | 2003-03-12 | Robert Bosch Gmbh | Polishing plate |
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-
2010
- 2010-08-31 EP EP10174588A patent/EP2422931A1/en not_active Ceased
-
2011
- 2011-08-24 CN CN2011800392040A patent/CN103068524A/en active Pending
- 2011-08-24 PL PL11748385T patent/PL2611573T3/en unknown
- 2011-08-24 ES ES11748385.9T patent/ES2619591T3/en active Active
- 2011-08-24 EP EP11748385.9A patent/EP2611573B1/en active Active
- 2011-08-24 WO PCT/EP2011/064526 patent/WO2012028505A1/en active Application Filing
- 2011-08-24 US US13/579,889 patent/US9132527B2/en active Active
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US3092937A (en) * | 1961-03-30 | 1963-06-11 | Tocci-Guilbert Berne | Polishing and abrading apparatus |
EP1291134A1 (en) * | 2001-09-08 | 2003-03-12 | Robert Bosch Gmbh | Polishing plate |
US20080216272A1 (en) * | 2004-09-10 | 2008-09-11 | Lake Country Manufacturing, Inc. | Buffing system including load absorbing fixture with multiple compression load deflection and replaceable working face |
Also Published As
Publication number | Publication date |
---|---|
EP2422931A1 (en) | 2012-02-29 |
WO2012028505A1 (en) | 2012-03-08 |
US20120315833A1 (en) | 2012-12-13 |
PL2611573T3 (en) | 2017-08-31 |
EP2611573A1 (en) | 2013-07-10 |
ES2619591T3 (en) | 2017-06-26 |
CN103068524A (en) | 2013-04-24 |
US9132527B2 (en) | 2015-09-15 |
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