EP1050377B1 - 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 which 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 is 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 rotary drivable machine grinding tool, consisting of a carrier body which is attachable by means of connecting elements to a machine drive and which has at least one engageable with a workpiece to be ground work surface, which is equipped with abrasive, according to the preamble of Claim 1. Such a tool is out US 3,252,775 A known.

Abrasive tools of the type described above are known as so-called "grinding wheels". Their work surfaces are usually equipped with grinding abrasive serving as an abrasive. As a work surface, all surfaces of a disc can be used, which are moved with rotation of the disc with sufficient circumferential speed for grinding around the center of rotation of the disc. The peripheral speed is highest in the periphery of the grinding wheels, so that there surface areas are usually equipped with abrasive cloths and the so-called "work surfaces" are there.

For grinding profiles, the working surfaces of the grinding tools can be adjusted according to the grinding Profile to be contoured. The contoured work surface is covered with abrasive cloth, which is so thin that it can be folded into the contours. Used abrasive cloth must be loosened regularly from the grinding tool and replaced with re-glued abrasive cloth.

For each profile grinding tools are required with appropriate contouring, with several identically contoured grinding tools prepared and are to provide the same time, so as not to interrupt the grinding process of the same workpieces with long set-up and downtime and thus cost low cost.

Consequently, grinding with such grinding tools is only reasonably economical if a sufficient number of identical workpieces are to be ground, so that the provision of sets of correspondingly profiled grinding tools is worthwhile.

The advantages of grinding workpieces on an industrial scale, however, in particular individually profiled workpieces, especially when, if they occur only in small quantities, no longer usable. This is especially true for turned wood parts, which are usually incurred only in small quantities. In addition, have turned workpieces often such fine or deep Profilgebungen that the reason according to stabbed grooves, grooves or the like, is hardly or only very difficult to reach with a located on the surface of a contoured grinding tool grinding cloths. To achieve the reason, the Abrasive pressure is often increased, which in turn, however, leads either to the removal of unwanted place of the workpiece disadvantageously or to burn the abrasive due to a pressure-point load and then there resulting increased frictional heat.

The invention has for its object to provide a rotating drivable grinding tool that is universally and economically useful for any grinding workpieces, especially workpieces with profiled surface, such as turned workpieces, moldings or the like.

This object is achieved by the features of claim 1.

The formation of the carrier body as a disk has the advantage that the carrier body can yield resiliently at grinding forces acting transversely to the disk plane during grinding. This allows a favorable soft grinding. In addition, this property of soft grinding is further promoted by the fact that abrasive cloth is attached to the support body or the disc, which has a padded layer on its underside. Since this padding position surrounds both the disk surfaces which are approximately radially to the center of rotation, at least in the region of the periphery of the disk, as well as the outer edge or the outer edge of the plate-shaped carrier body which is in the form of a rim, then likewise in the manner of an enclosure substantially radially acting pressure forces are cushioned by the cushion layer, so that relatively aggressive, but still without chatter marks and without that builds up excessive frictional heat, especially at the bottom of narrow and deeper profiles, even with the narrow radius of the wrapped around the edge or edge Schleifleinens of the workpieces, can be smoothed.

The grinding tool is advantageously relatively flat, so that it is suitable for narrow grooves and punctures, as they occur in particular with turning parts made of wood or turned parts made of metal and copper materials, to grind.

The grinding tool according to the invention can be used for grinding work, for which previously contoured grinding wheels were required, so that now there is a universally usable grinding tool.

The abrasive is a sheet, that is, it may be a portion of a tape, a sheet, an abrasive sheet or the like raw or starting element having a layer of abrasive cloth or abrasive paper of desired grain size on one side, the non-slip back, is equipped with an elastic padding layer.

The cushion layer is advantageously a foam with appropriate porosity and elasticity. On the non-abrasive surface of the back, such as a grinding cloth, the cushion layer is laminated or the cushion layer with the surface of the back firmly connected, for example, characterized in that the foam is foamed directly onto the back of the abrasive cloth.

The padding layer has a thickness of about 1 to 5 mm, preferably 2.5 to 3 mm. Thinner cushions are easily durchdrückbar at high Schleifandruck, that is, they can penetrate locally, whereby the benefits of soft grinding are lost. On the other hand, thicker padding layers have the disadvantage that they stretch or stretch excessively due to centrifugal forces that occur, which can lead to undesired changes in shape and, under certain circumstances, detachment from the carrier body. A thickness of the padding layer of about 2.5 mm and an open-cell plastic foam with a compression hardness of 10 to 60 and a density of 17 to 40 kg per m ³ has proven successful.

Serving as a carrier body disc is advantageously designed as a disc ring, since the inner hole of a disc ring can serve as an approach for fasteners. For this purpose, the hole edge of the inner hole, for example, corresponding material reinforcements or thickenings have, which can be formed to record for clamping elements present as connecting elements, with which the grinding tool on or on a through the inner hole extending, or in the inner hole projecting shaft, a hollow cylinder , can tension a bush or a pin of a machine drive.

Both machine-guided and hand-guided drives can be used.

The approach of the carrier body is designed as a short, for example, 7 mm long sleeve, wherein the disc corresponds to an approximately radially projecting from the sleeve about 10 mm wide collar flange. Sleeve with collar flange thus form the support body, which can be easily and quickly put on a shaft, a hollow cylinder, a bushing, a pin or the like rotating part of a machine drive by means of the sleeve approach and centered sufficiently accurate due to the sleeve is. The design of the carrier body is made such that the disc flange corresponding to the flange, based on the length of the sleeve, sits off-center on the sleeve. If the thickness of the abrasive material is greater than the smallest distance between the collar flange and the respective associated end of the sleeve, neither parts of the carrier body nor connecting elements are present beyond the actual grinding surface of the abrasive material, which covers the corresponding side or surface of the collar flange.

The inner surface of the sleeve may be provided with radially inwardly projecting dogs which are inserted into corresponding grooves, e.g. engage the present as a hollow cylinder, bush or the like connecting elements or directly in the shaft or a pin of the machine drive and ensure a rotationally fixed seat of the grinding tool.

With particular advantage sleeve and collar flange are a one-piece plastic injection molded part. Sleeve and collar flange have approximately the same wall thickness and can be produced inexpensively from plastic in high quantities by injection molding. Other materials for the carrier body, such as sheets, are possible. After covering the collar flange with the padded abrasive, there is a cheap abrasive tool that is universally applicable to many Abrasive work can be used and after wear of the abrasive grinding layer can be easily replaced completely. Worn grinding tools of the type according to the invention require no reprocessing, as is the case with profiled grinding tools, but can also be disposed of completely. The grinding tools according to the invention are thus so-called "disposable parts".

The plastic used to form the carrier body is most particularly a glass fiber reinforced polyamide. The glass fiber reinforced despite thin-walled design of the support body, the necessary strength, but allows the desired resilient properties of the collar flange itself, including the yielding of the entire disc with appropriate pressure on a workpiece to be ground. A polyamide has the additional advantage that this material is soluble with formic acid, so that loosened surface areas can act as an applied adhesive. As a result, after wetting the surfaces of the collar flange with formic acid, the abrasive with its cushioning layer or alternatively provided ring body can be easily and without additional use special adhesive to connect to the carrier body. For the compound is particularly advantageous that it is in the padding layer to an open-cell foam acts, with which the solute material of the support body can connect particularly intense and firm, since the solute material can penetrate into the pores of the foam and provides anchoring for opposite side as soon as the solvent evaporates again and the "gluing" is dried.

Also provided as an alternative abrasive ring body consists of a plastic foam, preferably polyurethane foam of predetermined hardness.

The attachment of the abrasive can be made simple in that the abrasive is present in the form of a predetermined, for sizing the carrier body or the annular body respectively matching blank. Blanks can be prepared and provided to equip the carrier body or ring body with it. From plates, strips, strips or the like raw material of the abrasive, the corresponding blanks can be readily manufactured. Appropriately, each directly attachable to the carrier body blank is a flat, substantially round stamped part with wedge-shaped edge cuts or notches. The edge notches or notches make it possible to place the blank of the abrasive in the manner of a collar wrinkle-free around the outer edge of the disc or the collar flange or on the curved working surface of the annular body. Preferably arranged in the center of the blank, a hole whose diameter is about the same, but not smaller than the outer diameter of the sleeve present as approach of the carrier body. The hole in the center of the blank thus does not hinder the attachment of the grinding tool to a shaft or a clamping pin of a machine drive.

In the grinding tool provided as an alternative in which the abrasive comprises the ring body, the outer diameter of the annular body is dimensioned so that its outer peripheral surface projects beyond the outer edge of the collar flange of the carrier body by a predetermined amount and in that a region of the outer peripheral surface of the annular body facing away from the carrier body Having abrasive. Since the annular body is made of elastic plastic foam, it forms a cushion advantageous for the grinding behavior, wherein the outer dimensions of the support body projecting portions of the annular body can further advantageously give an increased Schleifandruck, since such projecting or projecting portions of the somewhat stiffer collar flange the support body are not overly supported.

A region of the outer circumferential surface of an annular body remote from the carrier body can be provided with a chamfer, a groove or the like profiling be, which in turn has the Abrasivlage. Cuts with different radii and varying dimensions of the chamfers allow a cost-effective provision of diverse, universally applicable grinding tools.

The grinding tools can be easily and quickly connected with machine drives, since a machine drive comprises a tensioned on a drive pin of a machine hollow cylinder whose outer diameter is equal to the inner diameter of the carrier body and on the at least one consisting of carrier body with annular body grinding tool attachable and by a Festsetzorganes is fastened.

The hollow cylinder, which can also be referred to as a sleeve, has a length which makes it possible to line up different grinding tools on the hollow cylinder. The mutual alignment and assignment of the grinding tools can be made so that grinding tool combinations are formed, which correspond to the respective workpiece to be ground, in particular profiled workpiece. If the abrasives are worn and need to be replaced, the entire hollow cylinder can be removed as a unit with the attached grinding tools from the drive pin of a machine. With new grinding tools stocked hollow cylinder can be provided, so that a retooling in advantageously short assembly time is possible. Business interruptions can be kept to a minimum.

As Festsetzorgane slidable clamping rings can be provided on the hollow cylinder. Each clamping ring has at least one clamping screw, so that it can be fixed in any pushed-on position on the hollow cylinder.

If there are several grinding tools that can be plugged into a hollow cylinder, they can be assigned between spacers acting on them. With the spacers can be set a predetermined distance between two mounted on a hollow cylinder grinding tools.

Each hollow cylinder has in its peripheral surface at least one longitudinal groove, in which in each case one of the carriers of a carrier body of a stuck on the hollow cylinder grinding tool engages positively. As a result, each carrier body inserted on the hollow cylinder is non-rotatably arranged on the hollow cylinder. The hollow cylinder forms a rotating part of the machine drive and takes the plugged carrier body with the abrasive thereon. With particular advantage are provided as spacers each in a longitudinal groove positively insertable rod parts. Each rod part is a cut off from a plastic profile bar piece, each having 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 and rings or sleeves are conceivable. Spacers must be relatively accurately sized or dimensioned, which is done by machining. For the user of the grinding tool this means that he must have a variety of manufactured with the highest accuracy spacers or rings - which can be combined with each other in a time-consuming and mübsiger way, if necessary, to set the particular desired distance between two grinding tools on a hollow cylinder.

In contrast, the rod parts make it possible advantageously to cut off a piece of predetermined length, which is then inserted into the longitudinal groove of the hollow cylinder. If the piece cut off from the rod part proves to be too long, it can easily be cut shorter. This measure is familiar to any relevant craftsman.

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

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.

Show it:

Fig. 1:

a side view of the grinding tool on average,

Fig. 2:

a side view of the carrier body of the grinding tool according to Fig. 1 on average,

3:

a plan view of the carrier body according to Fig. 2 .

4:

a plan view of a blank of abrasive for equipment of the carrier body according to FIGS. 2 and 3 to a grinding tool according to Fig. 1 .

Fig. 5:

a side view of the grinding tool with connecting elements for clamping on 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:

a side view of a grinding tool in section accordingly Fig. 6 , with a modified embodiment 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:

Another embodiment of the grinding tool gem. Fig. 8 .

10, 11, 12:

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

Fig. 13:

a side view of an embodiment example of an assembly of machine drive and Schleifwerkzeu gene,

Fig. 14:

a schematic detail view of a longitudinal groove in the hollow cylinder of the engine drive and an insertable therein spacer element and

Fig. 15:

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

Fig. 1 shows a grinding tool cut in side view. The grinding tool consists of a carrier body 1, in the periphery of which abrasive 2 is arranged. The carrier body consists from a disc 3, which is so thin, for example 1 mm, that it can elastically spring transversely to the disc plane. In the disk center is located as an approach for fasteners about 7 mm short sleeve 4, wherein the disc 3 corresponds to a projecting approximately radially from the sleeve 4 collar flange.

The abrasive 2 is a flat structure, which is placed around the outer edge 5 of the disc 3 in the manner of an enclosure. The abrasive comprises an abrasive cloth 6 having on its backside an elastic padding layer 7. The padding layer may be foam rubber or plastic foam and has a thickness of about 2.5 mm, whereby good molding properties of the abrasive are achieved. Advantageously, the outer radius of the abrasive over the area of the outer edge edge 5 can be kept small.

Fig. 2 shows the carrier body 1 in a side view. Same components are given the same reference numbers as in Fig. 1 designated. Fig. 2 especially in connection with Fig. 1 recognize that the disc 3 corresponding flange located relative to the length of the sleeve 4 eccentrically on the sleeve. As Fig. 1 illustrates, the thickness of the abrasive is greater than the smallest distance of the disc 3 corresponding collar flange from the end 8 of the sleeve ( Fig. 2 ), so that the in Fig. 1 visible advantageous Overlap of the abrasive results in the full utilization of the lower frontal working surface of the grinding tool ( Fig. 1 ).

Fig. 3 shows a plan view of the carrier body 1 according to Fig.2 , Identical components are designated by the same reference numbers.

Fig. 2 and Fig. 3 illustrate in particular the formation of the carrier body 1 similar to a disc ring, wherein the inner surface of the sleeve has radially inwardly projecting driver 9, which ensure the rotationally fixed attachment of the carrier body to fasteners or to a shaft or spindle of a machine drive.

Each support member is advantageously an injection molded part of glass fiber reinforced polyamide, e.g. known under the trade name "Ultramid". This is a shock-resistant and highly resilient plastic, which allows the bending load capacity of the approximately 1 mm thin disc 3, which is in the form of a collar flange of the sleeve 4. In addition, this plastic develops when dissolved with suitable solvent, such as formic acid, adhesive properties that can be used to advantage for connecting the carrier body with abrasive.

Fig. 4 shows in a plan view that the abrasive in the form of a predetermined, the Dimensioning of the carrier body 3 each matching blank is present.

At the in Fig. 4 shown blank of the abrasive 2 is a planar, substantially circular stamped part with wedge-shaped edge recesses 10, which can also be referred to as notches. The edge recesses 10 in conjunction with the holes 11 located at the bottom of the incisions allow a wrinkle-free laying around of the abrasive material about the outer edge 5 of the carrier body 1 in the form of a disc 3.

In the center region of the blank is a hole 12 whose diameter is about the same, but not smaller than the outer diameter of the present as a sleeve 4 approach of the carrier body 1. In Fig. 4 The main working side of the abrasive, the abrasive layer, is visible. The padding under the visible here abrasive cloth is therefore mitzugeschnitten accordingly.

The annular disk-shaped region between the holes 11 and the inner hole 12 forms a main working side without any cuts. In addition, the inner hole 12 allows a hidden screwing or clamping with the drive machines.

Fig. 5 schematically shows the attachment of the grinding tool with connecting means to the shaft 13th a machine drive. The connecting means comprise a seated on the shaft 13 clamping ring 14 which has grooves 15 in the region of its outer circumference, in which the driver 9 of the carrier body 1 of the grinding tool can engage to rotatably connect the grinding tool with the shaft 13.

16 denotes a second clamping ring. The two clamping rings 14 and 16 are drawn here in the manner of an exploded view. They can be screwed together or clamped, whereby they then clamp the grinding tool between them.

Fig. 6 shows a second embodiment for connecting the grinding tool with a machine drive. In this embodiment, the clamping ring 14 'is provided with a smaller inner bore 17, which allows the insertion of a clamping pin 18. The clamping pin 18 has a threaded blind hole 20 on the end face of its journal foot 19, which can be plugged into the bore 17. Once the clamping tool is set to the clamping plate 14 ', that the drivers 9 are positively received in the grooves 15', a clamping cover 21 is attached to the opposite side of the grinding tool, which is disc-shaped and a stamped part may be made of sheet metal. In the center of the clamping cover 21 has a counterbore 22. The outer diameter of the Clamping cover 21 is about the same, but not larger than the inner diameter of the sleeve of the carrier body 1. This allows the clamping cover 21 rest on the shoulders 23 on the underside of the shorter relative to the sleeve length driver. The clamping cover 21 is thus absorbed sunk in the sleeve when it is secured with the countersunk screw 24 on the journal 19 of the pin 18, and once all the components are joined together under clamping or Zwischenklemmung the grinding tool and pulled together.

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

Fig. 7 shows a further particularly advantageous embodiment possibility for connecting the grinding tool with a machine drive. In this embodiment, a lower extension 25 of the inner bore 17 is provided in the clamping ring 14 '', in which a conventional spring ring 26 is inserted. In this embodiment also has the clamping cover 21 in its circumference cut grooves 27 and 27 ', which are congruent with corresponding rotational position of the clamping disc to the drivers 9 of the support body 1, so that it can be pulled down without removing the clamping cover 21 , Likewise, with appropriate rotational position from below a new Sliding tool be pushed. As long as the longitudinal screw 24 is not tightened, the spring washer 26 presses the clamping cover 21 from the clamping ring 14 "so far that a manual rotation of the clamping cover 21 is readily possible to bring it into a congruent with the drivers position 9. In this Position, the driver 9, the grooves 27 happen.

If subsequently the countersunk screw 24 is tightened, the spring washer 26 causes the co-rotation of the clamping cover due to the friction between the countersunk head of the countersunk screw 24 and the clamping cover 21, whereby the grooves 27 and 27 'located on the circumference of the clamping cover 21 are congruent Position come, with which the grinding tool is securely fixed again.

Fig. 8 shows a side view of an alternative embodiment of a grinding tool in section. The carrier body is again denoted by 1 and consists of a sleeve 4 with disc 3, which corresponds to a projecting approximately radially from the sleeve collar flange. As an abrasive here is connected to the carrier body annular body 28 is provided. The annular body 28 consists of a polyurethane foam of predetermined hardness. The outer diameter of the annular body 1 is dimensioned so that its outer peripheral surface 29 projects beyond the outer edge 30 of the present as a collar flange disc 3 by a predetermined amount. A the carrier body. 1 Abkehrter region 31 of the outer peripheral surface of the annular body 28 has the Abrasivlage 32, which is indicated here as a dotted line. The region 31 of the outer peripheral surface of the annular body 28 facing away from the carrier body has a groove, so that correspondingly profiled workpieces can be ground.

Fig. 9 shows an embodiment of a grinding tool gem. Fig. 8 , wherein the carrier body 1 is provided with two annular bodies 28 and 28 '. This design makes it possible to grind corresponding profiles or simply to turn the grinding tool as soon as the Abrasivlage one of the ring body 28 or 28 'is worn.

In the FIGS. 10, 11 and 12 are half side views of different embodiments of abrasive tools presented as a ring body present abrasive. Fig. 10 shows an annular body, which provided with Abrasivlage 32 area 31 is formed as a groove.

Fig. 11 shows a ring body with a chamfer, which is provided with the Abrasivlage 32. In Fig. 12 the annular body 28 is unprofiled and the periphery is provided with a drawn over the upper edge of the annular body Abrasivlage 32, so that thus a shape is ready to grind a Pfalz.

Fig. 13 is a longitudinal section of a not shown on a drive pin of a machine tensionable hollow cylinder 34, which is part of a machine drive. The outer diameter of the hollow cylinder 34 is equal to the inner diameter plugged carrier body 1. In this embodiment, two support body 1 are placed on the hollow cylinder, the lower support body rests on a collar 35 which is located at the lower end of the hollow cylinder 34. Both carrier bodies are again provided with hollow bodies having annular bodies 28. Between the two ring body 28, as shown here, a copying ring 36 are set so that a schematically indicated here wood profile 37 can be ground.

The upper support body 1 or the grinding tool consisting of carrier body 1 and annular body 28 can be fastened to the hollow cylinder 34 with a fixing mechanism 38, the fixing mechanism being designed here as a clamping ring 39 which can be pushed onto the hollow cylinder 34 and which is secured by means of a clamping screw with hexagon socket 41 on the hollow cylinder in any longitudinal sliding position can be fixed. The clamping ring will be in this embodiment in the direction of arrow 42 to move until it rests on the package of abrasive tools or abuts the upper support body 1 of the first grinding tool.

In the outer peripheral surface of the hollow cylinder 34 longitudinal grooves 43 and 43 'are incorporated, which are part of the connecting elements with which the grinding tools to the hollow cylinder, which is part of a machine drive, are rotatably attachable. The torsional strength results from the fact that the carrier body, as before the FIGS. 2 and 3 described, radially inwardly projecting driver 9, which engage in the longitudinal grooves 43 and 43 'when the grinding tool is pushed onto the hollow cylinder.

In order to space the two grinding tools provided on the hollow spindle relative to each other so that the wooden profile 37 can be ground therewith, spacer elements are provided. In this embodiment, as a spacer element in each case in a longitudinal groove 43 and 43 'positively insertable rod member 44 or 44' is provided. Each rod part is a cut off from a plastic profile bar piece, each having the desired length.

Fig. 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 illustrates how a piece of a rod member 44 fits into the longitudinal groove form-fitting manner.

In Fig. 15 a machine drive is shown in a schematic view, on the hollow cylinder 34, two grinding tools are set, in an arrangement such she Fig. 13 corresponds, wherein the grinding tools are illustrated by the ring body 28 visible here. The wood profile to be ground is again denoted by 37 and the clamping ring by 39. In the continuous longitudinal groove 43 in the hollow cylinder 34 is between the two grinding tools here indicated visible rod member 44 is set as a spacer element.

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

While with the ring bodies 28, the curves on the outer edges of the wood profile 37 can be sanded, with the cylindrical grinding tool 46, the straight surface 47 of the outer edge of the wood profile 37 can be ground. For this purpose, a new grinding process is carried out, in which either the wood profile 37 is placed by existing on the grinding machine facilities in a lower level and passed past the rotating machine drive. The ring body 28 are disabled and only the cylindrical grinding tool 46 grinds. However, it is also possible to maintain the management level of the wood section 37 in the grinding machine and only offset the entire machine drive, so the spindle with the grinding tools, in terms of height, in each case either the ring body 28 or the abrasive layer on the circumference of the cylindrical grinding tool 46 to use.

Claims (10)

1. Rotationally drivable machine grinding tool, consisting of a carrier body which can be attached by means of connection elements to a machine drive and which has at least one working face which can be brought into bearing contact with a workpiece to be ground and which is equipped with abrasive material, the carrier body (1) being designed as a disc (3) which is so thin that it can spring elastically transversely with respect to the disc plane and which has at the disc centre an extension for the connection elements, characterized in that the abrasive material (2) is a sheet-like structure with an elastic cushioning layer (7) which is coated on one side with abrasive cloth (6), abrasive paper or suchlike abrasive layer, the said sheet-like structure, laid in the manner of a border around the outer marginal edge (5) of the disc (3), being fastened to the carrier body (1) by means of the cushioning layer (7).
2. Grinding tool according to Claim 1, characterized in that the extension of the carrier body (1) is designed as a short sleeve (4), the disc (3) corresponding to a collar flange projecting approximately radially from the sleeve (4).
3. Grinding tool according to one of Claims 1 and 2, characterized in that the disc (3) is designed as a disc ring.
4. Grinding tool according to one of Claims 2 and 3, characterized in that the collar flange corresponding to the disc (3) is seated eccentrically on the sleeve (4) in an amount of, for example, 7 mm with respect to the length of the sleeve (4).
5. Grinding tool according to one of the preceding claims, characterized in that the inner face of the sleeve (4) has dogs (9) projecting radially inwards.
6. Grinding tool according to one of the preceding claims, characterized in that the sleeve (4) and collar flange are a one-piece plastic injection moulding.
7. Grinding tool according to Claim 6, characterized in that the plastic is a glass-fibre-reinforced polyamide.
8. Grinding tool according to one of Claims 2 to 7, characterized in that the abrasive material (2) takes the form of a predetermined cut-to-size piece which in each case fits the dimensioning of the carrier body (1).
9. Grinding tool according to Claim 8, characterized in that each cut-to-size piece is a plane, essentially round stamping with wedge-shaped marginal incisions (10) or indentations.
10. Grinding tool according to one of Claims 8 and 9, characterized in that, at the centre of the cut-to-size piece, a hole (12) is arranged, the diameter of which is approximately equal to, but no smaller than, the outside diameter of the extension, present as a sleeve (4), of the carrier body (1).

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