EP1050377A2 - Rotating machine grinding tool - Google Patents

Abstract

The grinding tool has a carrier body (1) secured to the machine drive and provided as a disc (3) with at least one surface w is brought into contact with the workpiece (37). The disc is sufficiently thin to allow its elastic flexure perpendicular to the grinding plane, its centre provided with a fixing for a coupling elment attaching it to the machine drive. The grinding surface provided by an elastic cushioning layer with an abrasive covering, applied to the outer peripheral edge of the grinding disc.

Description

The invention relates to a rotationally drivable Machine grinding tool consisting of one Carrier body, which by means of connecting elements to a Machine drive can be used and the at least one can be brought into contact with a workpiece to be ground Has a work surface that is equipped with abrasives.

Schleifscheiben" bekannt. Deren Arbeitsflächen sind zumeist mit als Schleifmittel dienendem Schleifleinen ausgerüstet. Als Arbeitsfläche können alle Flächen einer Scheiben genutzt werden, die bei Rotation der Scheibe mit zum Schleifen ausreichender Umfangsgeschwindigkeit um das Drehzentrum der Scheibe bewegt werden. Die Umfangsgeschwindigkeit ist im Bereich der Peripherie der Schleifscheiben am höchsten, so daß dort befindliche Flächenbereiche zumeist mit Schleifleinen ausgerüstet werden und sich die sogenannten Arbeitsflächen" dort befinden.Grinding tools of the type described above are known as so-called

Grinding disks "are known. Their working surfaces are usually equipped with abrasive cloth which serves as an abrasive. All surfaces of a disc can be used as the working surface which, when the disc rotates, are moved around the center of rotation of the disc with sufficient peripheral speed for grinding of the grinding wheels at the highest, so that surface areas located there are mostly equipped with grinding lines and the so-called Work surfaces "there.

The work surfaces can be used to grind profiles of the grinding tools according to the one to be ground Profile be contoured. The contoured work surface is stuck with abrasive cloth that is so thin that it can be nestled into the contours. Used up Grinding lines must be removed from the grinding tool regularly loosened and re-glued on abrasive cloth be replaced.

Grinding tools are included for each profile appropriate contouring is required, with several prepared and contoured grinding tools are to be provided simultaneously to the grinding process same workpieces not with long set-up and Interrupt downtimes and therefore inexpensive to have to burden.

Grinding with such grinding tools is therefore only to some extent economical if a sufficient variety of the same Is to grind workpieces so that the Provision of sentences according to more profiled Grinding tools are worthwhile.

The advantages of grinding workpieces in industrial scale, however, are special at individually profiled workpieces, especially when they only occur in small quantities, not more usable. This applies particularly to turned items Wooden parts, mostly only in small numbers attack. They also have turned workpieces often such fine or deep profiles that the reason for appropriately pierced grooves, pills or the like, hardly or very difficult with one at the Surface of a contoured grinding tool abrasive lines located can be reached. For the reason to achieve, the grinding pressure is often increased, what however again disadvantageously either to Removal at an undesired point on the workpiece leads or to burn the abrasive due to a Pressure point load and the resulting pressure there increased frictional heat.

The invention is based on the object to provide a rotationally drivable grinding tool, that can be used universally and economically for any grinding work on workpieces, in particular Workpieces with a profiled surface, such as turned workpieces, profile strips or the like.

According to the invention, this object is achieved by that the carrier body is designed as a disc, the is so thin, e.g. 1 mm that they are transverse to Disc level can spring elastically and in Disc center an approach to the fasteners and that the abrasive is a flat structure with one side with abrasive cloth, sandpaper or the same abrasive layer coated elastic Upholstery layer is, which, in the manner of a surround the outer edge of the disc with which Padding layer is attached to the support body.

The formation of the carrier body as a disc has the Advantage that the support body at transverse to the plane of the disc pressure forces during grinding can yield resiliently. This enables an advantageous one soft grinding. In addition, this property of soft grinding also further promoted in that Carrier body or the disc grinding lines attached which is a cushion layer on its underside having. Since this cushioning layer both the two, about disc surfaces radially to the center of rotation, at least in the area of the periphery of the disc, as well the outer edge or the outer edge of the plate-shaped, as a disk or plate present carrier body in the Surrounding type of surround can also in essential radially acting pressure forces from the Cushion layer are cushioned, so that even with the narrow radius of the wrapped around the edge or the edge Sanding relatively aggressive, but without Chatter marks and without excessive friction heat builds up, especially at the bottom narrower and deeper Profiling of the workpieces, soft grinding.

The grinding tool is advantageously relatively flat, so it is suitable to narrow grooves and punctures, as they are especially with wood turning parts or Turned parts made of metal and copper materials occur grind.

The grinding tool according to the invention can for Grinding work is used, for which so far Contoured grinding wheels were required so that now a universal grinding tool is present.

The abrasive is a flat structure that means a section or part of a band, a plate, a sanding sheet or similar raw or Starting element that is a layer Abrasive cloth or sandpaper according to desired Has grit on one side, the non-abrasive Back, equipped with an elastic padding layer is.

The cushion layer is advantageously a foam appropriate porosity and elasticity. Not to them abrasive surface of the back, for example one Sanding, the upholstery is laminated or is the cushion layer with the surface of the back firmly connected, for example in that the foam foamed directly on the back of the sanding line is.

The cushion layer has a thickness of approximately 1 to 5 mm, preferably 2.5-3 mm. Thinner upholstery layers can be easily pushed through with high sanding pressure, i.e. they can pierce locally, which means that the advantages of soft sanding are lost. On the other hand, thicker cushion layers have the disadvantage that they stretch or stretch excessively due to centrifugal forces, which can lead to undesired changes in shape and, under certain circumstances, detachment from the carrier body. A thickness of the cushion layer of approximately 2.5 mm and an open-cell plastic foam with a compression hardness of 10 - 60 and a density of 17 - 40 kg per m ^{3 have} proven effective.

According to an alternative second solution to the problem, for which independent protection is also claimed created a grinding tool in which the carrier body is also designed as a disc that is so thin is that it can spring elastically across the plane of the disc and those in the disc center an approach for that Has fasteners on rotating parts of a machine drive are present and that with the An abrasive that can be combined with a carrier body is a Ring body made of elastic material in the area its periphery with abrasive cloth, sandpaper or the same abrasive layer is provided and the Carrier body is attached.

Carrier body and ring body together form one unit usable as a grinding tool attached to a Machine drive is attachable.

The disk serving as the carrier body is in both Solutions according to the invention advantageously as a disc ring trained because the inner hole of a disc ring as Approach for fasteners can serve. In addition, the Hole edge of the inner hole, for example, corresponding Have material reinforcements or thickenings that to recordings for clamping elements Fasteners can be formed, with which the Grinding tool on or on one through the inner hole extending, or protruding into the inner hole Shaft, a hollow cylinder, a bushing or a pin of a machine drive can be tensioned.

There are both machine-operated as well hand-held drives can be used.

The approach of the carrier body is a short e.g. 7 mm long sleeve formed, the disc about a radially protruding from the sleeve about 10 mm wide Collar flange corresponds. Form sleeve with collar flange thus the carrier body, which is identified by means of the sleeve Approach a wave easily, quickly and easily Hollow cylinder, a socket, a pin or the like rotating part of a machine drive is stuck and because of the sleeve also centered sufficiently precisely is. The configuration of the carrier body is like this hit that the corresponding to the disc Collar flange, based on the length of the sleeve, sits off-center on the sleeve. Is the thickness of the Abrasive larger than the smallest distance of the Collar flange from the respectively assigned end of the sleeve, are neither parts of the support body nor Fasteners over the actual grinding surface of the abrasive, which is the corresponding side or surface of the collar flange covered.

The inner surface of the sleeve can be radially inward protruding drivers that are in corresponding grooves e.g. the as a hollow cylinder, socket or the like present connecting elements or directly in the shaft or a journal of the machine drive intervene and ensure that the Ensure grinding tool.

The sleeve and collar flange are particularly advantageous as a one-piece plastic injection-molded part. The sleeve and collar flange have roughly the same wall thickness and can be manufactured inexpensively from plastic in large quantities using the injection molding process. Other materials for the carrier body, for example sheet metal, are possible. After the collar flange has been edged with the padded abrasive, there is a cheap grinding tool that can be used universally for many grinding jobs and can be easily replaced after the abrasive layer has worn out. Worn grinding tools of the type according to the invention do not require reprocessing, as is the case with profiled grinding tools, but can also be completely disposed of. The grinding tools according to the invention are thus so-called Disposable Parts ".

The plastic used to form the carrier body is, with particular advantage, a glass fiber reinforced polyamide. The glass fiber reinforcement produces the necessary strength despite the thin-walled design of the carrier body, but allows the desired resilient properties of the collar flange itself, i.e. also the yielding of the entire disc with appropriate pressure on a workpiece to be ground. A polyamide has the additional advantage that this material can be dissolved with formic acid, so that dissolved areas can act like an applied adhesive. As a result, after wetting the surfaces of the collar flange with formic acid, the abrasive with its cushioning layer or the alternatively provided ring body can be connected to the carrier body without any problem and without additional use of special adhesives. For the connection, it is particularly advantageous that the cushion layer is an open-cell foam with which the detached material of the carrier body can bond particularly intensively and firmly, since the detached material can penetrate into the pores of the foam and for anchoring on the other side ensures as soon as the solvent evaporates and the Adhesive "has dried.

Also the one intended as an alternative abrasive Ring body consists of a plastic foam, preferably polyurethane foam of predetermined hardness.

The abrasive can be attached simply be designed so that the abrasive is in shape a predetermined, for dimensioning the Carrier body or the ring body in each case matching Blank is present. Cuts can be prepared and provide around the carrier body or ring body to equip with it. From plates, tapes, strips or the same raw material of the abrasive can be manufacture the corresponding blanks without further ado. Conveniently, everyone is directly on the carrier body attachable cut a flat, essentially round Stamped part with wedge-shaped edge cuts or Notches. The edge incisions or notches make it possible to cut the abrasive according to Art an edging wrinkle-free around the outer edge of the Washer or the collar flange or to the curved Lay the work surface of the ring body. Preferably a hole is arranged in the center of the blank, the Diameter about the same, but not less than that Outside diameter of the approach of the sleeve Carrier body is. The hole in the center of the blank thus hinders attachment of the grinding tool a shaft or a clamping pin of a machine drive Not.

In the alternative provided Grinding tool where the abrasive is the ring body includes, the outer diameter of the ring body is so dimensioned that its outer peripheral surface the outer edge of the collar flange of the support body around pre-determined dimension and that the carrier body area of the outer peripheral surface of the Ring body has the abrasive layer. Because the ring body consists of elastic plastic foam, it forms a for the grinding behavior advantageous cushion, the the outer dimensions of the carrier body are outstanding Regions of the ring body even more advantageous Way can give way to an increased grinding pressure, because such protruding or outstanding areas of the somewhat stiffer collar flange of the carrier body to be supported excessively.

A region facing away from the carrier body The outer circumferential surface of a ring body can be a fillet or similar profile be, which in turn has the abrasive layer. Fillets with different radii and varying dimensions of the bevels allow inexpensive provision various, universally usable grinding tools.

The grinding tools can be operated with machine drives easy and quick connection, as a machine drive one on a drive journal of a machine includes stretchable hollow cylinder, the outer diameter is equal to the inside diameter of the carrier body and on the at least one of a carrier body with a ring body existing grinding tool attachable and by means of a Fixing member is attachable.

The hollow cylinder, also called a bush has a length that allows various grinding tools on the hollow cylinder to line up. The mutual alignment and assignment the grinding tools can be taken so that Abrasive tool combinations are formed that the each workpiece to be ground, in particular profiled workpiece. Are the Abrasives can wear out and may need to be replaced the entire hollow cylinder as a unit with those on it mounted grinding tools from the drive pin one Machine can be removed. With new grinding tools equipped hollow cylinders can be provided, so that a changeover in an advantageously short assembly time is possible. Business interruptions can be on Press minimum.

As fixing elements can be on the hollow cylinder sliding clamping rings can be provided. Every clamp ring has at least one clamping screw so that it is in Any slide-on position can be fixed on the hollow cylinder is.

Are several pluggable on a hollow cylinder Grinding tools in place can put them between them acting spacers can be assigned. With the Spacers can be a predetermined distance between two attached to a hollow cylinder Adjust grinding tools.

Each hollow cylinder has in its peripheral surface at least one longitudinal groove, in each of which one of the Carrier of a carrier body one on the hollow cylinder inserted grinding tool engages positively. As a result, everyone is stuck on the hollow cylinder Carrier body rotatably arranged on the hollow cylinder. The Hollow cylinder forms a rotating part of the machine drive and takes the attached body with the abrasive on it. With special Advantage are spacers in a longitudinal groove rod parts which can be inserted in a form-fitting manner. Each Rod part is one of a plastic profile rod cut piece with the desired length. In the longitudinal groove of the hollow cylinder can also Engage the clamping screw of a clamping ring.

Of course, as a spacer Rings or sleeves conceivable. Spacers must be relative be dimensioned or dimensioned by what machining is done. For the user of the This means that it has a variety of grinding tools Spacers made with the highest accuracy or - wrestle must be ready, which may be right time consuming and tedious way to get together combine to get the desired distance between two grinding tools on a hollow cylinder adjust.

The rod parts make it possible in advantageously, a piece of predetermined length cut that off in the longitudinal groove of the hollow cylinder is used. That turns out from the rod part cut piece as too long, it can be easiest Be cut shorter. This measure is everyone relevant craftsmen familiar.

Fig. 1:

eine Seitenansicht des Schleifwerkzeuges im Schnitt,

Fig. 2:

eine Seitenansicht des Trägerkörpers des Schleifwerkzeuges gemäß Fig. 1 im Schnitt,

Fig. 3:

eine Draufsicht des Trägerkörpers gemäß Fig. 2,

Fig. 4:

eine Draufsicht eines Zuschnittes aus Schleifmittel zur Ausrüstung des Trägerkörpers gemäß Fig. 2 und 3 zu einem Schleifwerkzeug gemäß Fig. 1,

Fig. 5:

eine Seitenansicht des Schleifwerkzeuges mit Verbindungselementen zum Aufspannen auf eine Welle einer Antriebsmaschine,

Fig. 6:

eine Seitenansicht eines Schleifwerkzeuges im Schnitt mit Verbindungs elementen zum Ansetzen des Schleifwerkzeuges an einen Spannzapfen einer Antriebsmaschine,

Fig. 7:

eine Seitenansicht eines Schleifwerkzeuges im Schnitt entsprechend Fig. 6, mit einer abgewandelten Ausführung der Verbindungselemente zum Ansetzen an den Spannzapfen einer Antriebsmaschine,

Fig. 8:

eine Seitenansicht einer alternativen Ausführungsform des Schleifwerkzeuges im Schnitt,

Fig. 9:

eine weitere Ausführungsform des Schleifwerkzeuges gem. Fig. 8,

Fig. 10, 11, 12:

halbe Seitenansichten der Schleifwerkzeuge mit unterschiedlichen Profilgebungen der mit Abrasivmaterial ausgerüsteten Arbeitsflächen,

Fig. 13:

eine Seitenansicht eines Ausführungs beispieles für eines Zusammenbaues aus Maschinen-Antrieb und Schleifwerkzeu gen,

Fig. 14:

eine schematische Detailansicht einer Längsnut im Hohlzylinder des Maschinen-Antriebs und eines darin einfügbaren Distanzelements und

Fig. 15:

ein Ausführungsbeispiel für die Zusammenstellung bzw. Kombination von Schleifwerkzeugen und deren Anordnung bei einem Maschinen-Antrieb in schematischer Ansicht.

Embodiments of the invention, from which further inventive features result, are shown in the drawing. Show it:

Fig. 1:

a side view of the grinding tool in section,

Fig. 2:

2 shows a side view of the carrier body of the grinding tool according to FIG. 1 in section,

Fig. 3:

3 shows a top view of the carrier body according to FIG. 2,

Fig. 4:

2 shows a plan view of a blank made of abrasive for equipping the carrier body according to FIGS. 2 and 3 to form a grinding tool according to FIG. 1,

Fig. 5:

2 shows a side view of the grinding tool with connecting elements for clamping onto a shaft of a drive machine,

Fig. 6:

a side view of a grinding tool in section with connecting elements for attaching the grinding tool to a clamping pin of a drive machine,

Fig. 7:

6 shows a side view of a grinding tool in section corresponding to FIG. 6, with a modified design of the connecting elements for attachment to the clamping pin of a drive machine,

Fig. 8:

a side view of an alternative embodiment of the grinding tool in section,

Fig. 9:

a further embodiment of the grinding tool acc. Fig. 8,

10, 11, 12:

half side views of the grinding tools with different profiles of the work surfaces equipped with abrasive material,

Fig. 13:

a side view of an embodiment example for an assembly of machine drive and grinding tools,

Fig. 14:

a schematic detailed view of a longitudinal groove in the hollow cylinder of the machine drive and a spacer element insertable therein and

Fig. 15:

an embodiment of the compilation or combination of grinding tools and their arrangement in a machine drive in a schematic view.

Fig. 1 shows a grinding tool in the Side view cut. The grinding tool is there from a carrier body 1, in the peripheral region thereof Abrasive 2 is arranged. The carrier body is made from a disc 3 that is so thin e.g. 1 mm that it can spring elastically across the disc plane. in the Disc center is as an approach for Fasteners an approximately 7 mm short sleeve 4, wherein disk 3 approximately radially from sleeve 4 protruding collar flange corresponds.

The abrasive 2 is a flat structure, which in the manner of a border around the outer edge 5 the disc 3 is placed. The abrasive includes a Abrasive cloth 6, one on the back has elastic cushion layer 7. The upholstery layer can Be foam or plastic foam and has one Thickness of about 2.5 mm, which gives good molding properties of the abrasive can be achieved. With The outer radius of the abrasive can be advantageous keep the area of the outer edge 5 small.

Fig. 2 shows the carrier body 1 in one Side view. The same components are the same Reference numerals as designated in Fig. 1. Fig. 2 leaves especially in connection with Fig. 1 recognize that the the corresponding flange 3 collar flange based on the Length of the sleeve 4 sits off-center on the sleeve. How Fig. 1 illustrates the thickness of the abrasive larger than the smallest distance of the disc 3 corresponding collar flange from the end 8 of the sleeve (Fig. 2), so that the advantageous visible in Fig. 1 The excess of the abrasive results in a full Use of the lower front work surface of the Grinding tool (Fig. 1) allows.

3 shows a top view of the carrier body 1 according to Fig. 2. The same components are the same Designated reference numbers.

2 and 3 illustrate in particular the Formation of the carrier body 1 similar to a Disc ring, the inner surface of the sleeve facing radially internally projecting driver 9, which is the non-rotatable Attaching the carrier body to connecting elements or a shaft or spindle of a machine drive guarantee.

Each carrier part is advantageously an injection molded part made of glass fiber reinforced polyamide, for example under the trade name Ultramid ". This is an impact-resistant and highly resilient plastic that enables the bending strength of the approximately 1 mm thin disc 3, which is in the form of a collar flange of the sleeve 4. This plastic also develops when dissolved with a suitable solvent, for example formic acid, Adhesive properties that can be used to advantage to connect the carrier body with abrasives.

Fig. 4 shows in a plan view that the Abrasive in the form of a predetermined, for Dimensioning of the support body 3 each appropriate Blank is present.

In the blank shown in Fig. 4 Abrasive 2 is a flat, in essential round stamped part with wedge-shaped Edge incisions 10, which are also called notches can be designated. The edge incisions 10 in Connection with those at the bottom of the incisions Holes 11 allow a wrinkle-free laying around Abrasive around the outer edge 5 of the form of a Disc 3 present carrier body 1.

There is a in the center area of the blank Hole 12, the diameter of which is approximately the same, but not smaller than the outer diameter of the sleeve 4 present approach of the carrier body 1. 4 is the main working side of the abrasive, the Abrasive layer, visible. The upholstery layer under this visible grinding lines is therefore appropriate recorded.

The ring-shaped area between the holes 11 and the inner hole 12 forms a main working side without any cuts. It also enables Inner hole 12 a concealed screw connection or Bracing with the drive machines.

Fig. 5 shows schematically the preparation of the Grinding tool with connecting means to the shaft 13 of a machine drive. The connecting means include a clamping ring 14 seated on the shaft 13, which in Area of its outer circumference has grooves 15, in which the driver 9 of the carrier body 1 of the grinding tool can intervene to rotate the grinding tool to connect the shaft 13.

16 is a second clamping ring. The two clamping rings 14 and 16 are here in the manner of one Exploded view drawn. You can screwed or clamped together, which they Then clamp the grinding tool between them.

Fig. 6 shows a second embodiment of the Connection of the grinding tool with a Machine drive. In this embodiment, the Clamping ring 14 'with a smaller inner bore 17 provided that the insertion of a clamping pin 18th enables. The clamping pin 18 has on the front side of its tenon 19, which can be inserted into the bore 17 is a threaded blind hole 20. Once the clamping tool is placed on the tensioning disc 14 'so that the Carrier 9 positively received in the grooves 15 ' are on the opposite side of the Grinding tool attached a clamping lid 21, the is disc-shaped and a stamped part Tin can be. In the center there is a clamping cover 21 a counterbore 22. The outside diameter of the Span lid 21 is approximately the same, but not greater than that Inner diameter of the sleeve of the carrier body 1. This can the stretch lid 21 on the shoulders 23 to the Bottom of the shortened compared to the sleeve length Driver 9 rest. The clamping cover 21 is thus in the sleeve sunk when he sunk with the Countersunk screw 24 attached to the pin base 19 of the pin 18 and as soon as all components are caught or Intermediate clamping of the grinding tool put together and have contracted.

The clamping pin 18 can be placed in a chuck, for example an electric hand drill clamp.

Fig. 7 shows another particularly advantageous Design option for connecting the grinding tool with a machine drive. With this The exemplary embodiment is a lower one in the clamping ring 14 ″ Extension 25 of the inner bore 17 is provided in the one Usual spring ring 26 can be inserted. With this The clamping cover 21 also has an exemplary embodiment in FIG grooves 27 and 27 'cut into its circumference on the with the corresponding rotating position of the tension disc stand congruent to the drivers 9 of the carrier body 1, so that it can be pulled down without the Remove the tension cover 21. Likewise, at corresponding rotary position also a new one from below Grinding tool can be pushed on. As long as the Longitudinal screw 24 is not tightened, presses Spring washer 26 the clamping cover 21 from the clamping ring 14 '' to the extent that a manual twisting of the clamping cover 21 is easily possible to convert it into one with the To bring 9 congruent position. In this Position, the drivers 9 can pass the grooves 27.

If the countersunk screw 24 is then tightened, causes the spring washer 26 that due to the Friction between the countersunk head of the countersunk screw 24 and the Clamping cover 21 results in the clamping cover rotating, which are located on the circumference of the clamping cover 21 Grooves 27 and 27 'come out of their congruent position, with which the grinding tool is securely fastened again.

Figure 8 shows a side view of an alternative Embodiment of a grinding tool in section. The Carrier body is again designated 1 and consists of a sleeve 4 with disc 3, which is approximately radial from the collar flange protruding from the sleeve. As Abrasive is here with the backing connected ring body 28 is provided. The ring body 28 consists of a polyurethane foam of predetermined hardness. The outer diameter of the ring body 1 is dimensioned that its outer peripheral surface 29 the outer edge 30 of the as a collar flange disc 3 around a pre-determined dimension. A to the carrier body 1 turned area 31 of the outer peripheral surface of the Ring body 28 has the abrasive layer 32, which here as dotted line is indicated. That of the carrier body turned area 31 of the outer peripheral surface of the Ring body 28 has a groove, so that appropriately profiled workpieces are ground can.

9 shows an embodiment of a grinding tool acc. Fig. 8, wherein the carrier body 1 with two Ring bodies 28 and 28 'is provided. This execution makes it possible to grind corresponding profiles or the grinding tool is easy to turn as soon as the Abrasive position of one of the ring bodies 28 or 28 'worn out is.

10, 11 and 12 are half side views different embodiments of grinding tools with abrasive present as a ring body shown. Fig. 10 shows a ring body, the with Area 31 provided with abrasive layer 32 as a fillet is trained.

Fig. 11 shows an annular body with a chamfer, the is provided with the abrasive layer 32. 12 is the Ring body 28 is not profiled and the periphery is one drawn over the upper edge of the ring body Abrasive layer 32 provided so that a shape is ready to grind a Palatinate.

Fig. 13 is a longitudinal section of one on here Drive pin of a machine, not shown clamping hollow cylinder 34, part of a machine drive is. The outer diameter of the hollow cylinder 34 is the same as the inner diameter Carrier body 1. In this embodiment there are two Carrier body 1 inserted on the hollow cylinder, the lower support body on a collar 35, which is on located lower end of the hollow cylinder 34, rests. Both carrier bodies are again with fillets having annular bodies 28. Between the two Ring body 28 can, as shown here, a Copy ring 36 are set, so that here schematically indicated wooden profile 37 can be sanded.

The upper carrier body 1 or that of the carrier body 1 and ring body 28 existing grinding tool can on the Hollow cylinder 34 attached with a locking member 38 be, the fixing body here as one on the Hollow cylinder 34 slide-on clamping ring 39 formed is by means of a clamping screw with hexagon socket 41 on the hollow cylinder in any longitudinal sliding position is fixable. The clamping ring is on this Embodiment in the direction of arrow 42 still postpone it until it's off the package Abrasive tools rests on the top Carrier body 1 of the first grinding tool strikes.

In the outer peripheral surface of the hollow cylinder 34 are Longitudinal grooves 43 and 43 'incorporated, which are part of the Are fasteners with which the grinding tools to the hollow cylinder, which is part of a The machine drive is rotatable. The Torsional strength results from the fact that the carrier body, as previously described in FIGS. 2 and 3, radially inwards protruding driver 9, which in the longitudinal grooves 43 and 43 'intervene when the grinding tool is on the Hollow cylinder is pushed.

To the two grinding tools provided here to space the hollow spindle to each other so that the wooden profile 37 can be sanded Spacers provided. With this Embodiment is a in each case as a spacer a longitudinal groove 43 or 43 'can be used in a form-fitting manner Rod part 44 and 44 'provided. Every bar part is one cut from a plastic profile bar Pieces with the desired length.

14 shows a schematic view of a Section of the outer surface of the hollow cylinder 34 with the Longitudinal groove 43. The arrow 45 shows like a piece a rod part 44 fits positively in the longitudinal groove.

In Fig. 15, a machine drive is schematic Shown view, on the hollow cylinder 34 two Grinding tools are set in an arrangement like it corresponds to Fig. 13, with the grinding tools the ring body 28 visible here are illustrated. The Wood profile to be sanded is again designated 37 and the clamping ring with 39. In the continuous longitudinal groove 43 in the hollow cylinder 34 is between the two Grinding tools that are visible here Rod part 44 set as a spacer.

In this embodiment, the hollow cylinder so long that an additional cylindrical Grinding tool 46 can be plugged.

While with the ring bodies 28, the curves on the Outside edges of the wooden profile 37 can be sanded with the cylindrical surface 46 the straight surface 47 the outer edge of the wooden profile 37 are sanded. To do this, a new grinding process is carried out at which either the wooden profile 37 by at the Grinding machine existing facilities in a deeper Placed level and on the rotating machine drive is led past. The ring body 28 are excluded Function set and only the cylindrical Grinding tool 46 grinds. However, it is also possible the management level of the wooden profile 37 in the Keep grinder and only the whole Machine drive, i.e. the spindle with the Grinding tools, offset in height to each either the ring body 28 or the abrasive layer on the circumference of the cylindrical grinding tool 46 for use bring.

Claims (19)

Rotatingly driven machine grinding tool, consisting of a carrier body which can be attached to a machine drive by means of connecting elements and which has at least one work surface which can be brought into contact with a workpiece to be ground and which is equipped with abrasive,
characterized,
that the carrier body (1) is designed as a disc (3) which is so thin that it can elastically spring transversely to the disc plane and which has an attachment for the connecting elements in the disc center and that the abrasive (2) is a flat structure with one side elastic abrasive layer (7) coated with abrasive cloth (6), sandpaper or the like abrasive layer, which, placed like a border around the outer edge (5) of the disc (3), is fastened to the carrier body (1) with the cushion layer (7) is. Rotating drivable machine grinding tool, consisting of from a carrier body that is connected by means of connecting elements can be attached to a machine drive and the at least one with a workpiece to be ground has a work surface that can be brought into contact with Abrasive is equipped, characterized in that the carrier body (1) is designed as a disc (3), which is so thin that it is transverse to the plane of the disc can elastically spring and that in the disc center Approach for the fasteners and that Abrasive (2) an annular body (28) made of elastic Material that is in the area (31) of its periphery Abrasive cloth, sandpaper or the like abrasive layer (32) is provided and attached to the carrier body (1) is. Grinding tool according to one of claims 1 or 2, characterized in that the disc (3) as Disc ring is formed. Grinding tool according to one of the preceding claims, characterized in that the approach of the carrier body (1) is designed as a short sleeve (4), the Disc (3) approximately radially from the sleeve (4) protruding collar flange corresponds. Grinding tool according to claim 4, characterized in that the collar flange corresponding to the washer (3), based on the length of the sleeve (4), e.g. 7 mm sits off-center on the sleeve (4). Grinding tool according to one of the preceding claims, characterized in that the inner surface of the sleeve (4) has radially inwardly projecting driver (9). Grinding tool according to one of the preceding claims, characterized in that the sleeve (4) and collar flange are a one-piece plastic injection molded part. Grinding tool according to claim 7, characterized in that the plastic is a glass fiber reinforced polyamide. Grinding tool according to claim 1 and one of claims 3 to 8, characterized in that the abrasive (2) in the form of a predetermined, for dimensioning the Carrier body (1) each matching blank is present. Grinding tool according to claim 9, characterized in that each cut is flat, essentially round Stamped part with wedge-shaped edge cuts (10) or Notches is. Grinding tool according to one of claims 9 and 10, characterized in that at the center of the blank a hole (12) is arranged, the diameter of which is approximately the same, but not smaller than the outside diameter of the approach of the carrier body (1) present as a sleeve (4) is. Grinding tool according to claim 2 and one of claims 3 to 8, characterized in that the outer diameter of the ring body (28) is dimensioned so that its outer Circumferential surface (29) the outer edge (30) as Collar flange present washer (3) around pre-determined dimension and that the carrier body (1) turned area (31) of the outer peripheral surface (29) of the ring body (1) has the abrasive layer (32). Grinding tool according to claim 12, characterized in that an area (31) facing away from the carrier body (1) Outer peripheral surface (29) of the ring body (1) a chamfer, Has fillet or similar profile, which with the abrasive layer (32) is provided. Grinding tool according to claim 13, characterized in that a machine drive one on a drive journal a hollow cylinder (34) which can be clamped to a machine, whose outer diameter is equal to the inner diameter of the Sleeve (4) of the carrier body (1) and on the at least one made of carrier body (1) with ring body (28) existing grinding tool attachable and by means of a Fixing member (38) can be fastened. Grinding tool according to claim 14, characterized in that each fixing member (38) one on the hollow cylinder (34) sliding clamping ring (39) with at least one Clamping screw (40). Grinding tool according to one of claims 12 to 15, characterized in that several, on one Hollow cylinder (34) insertable grinding tools between spacers acting on them are assigned. Grinding tool according to claim 16, characterized in that each hollow cylinder in its outer surface has at least one longitudinal groove (43, 43 ') into which in each case one of the carriers (9) of a carrier body (1) one on the hollow cylinder (34) Grinding tool engages positively. Grinding tool according to claim 17, characterized in that as a spacer in each case in a longitudinal groove (43, 43 ') rod parts (44) which can be inserted in a form-fitting manner are. Grinding tool according to claim 18, characterized in that each rod part (44) one of one Plastic profile bar cut piece with each desired length.

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