EP1982796B1 - Grinding wheel - Google Patents

Grinding wheel Download PDF

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Publication number
EP1982796B1
EP1982796B1 EP08006716A EP08006716A EP1982796B1 EP 1982796 B1 EP1982796 B1 EP 1982796B1 EP 08006716 A EP08006716 A EP 08006716A EP 08006716 A EP08006716 A EP 08006716A EP 1982796 B1 EP1982796 B1 EP 1982796B1
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EP
European Patent Office
Prior art keywords
grinding wheel
region
projections
injection
grinding
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EP08006716A
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German (de)
French (fr)
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EP1982796A1 (en
Inventor
Florian Meissl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tyrolit-Schleifmittelwerke Swarovski KG
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Tyrolit-Schleifmittelwerke Swarovski KG
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Publication of EP1982796A1 publication Critical patent/EP1982796A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/02—Wheels in one piece
    • B24D5/04—Wheels in one piece with reinforcing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with cooling provisions, e.g. with radial slots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/12—Cut-off wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece
    • B24D7/04—Wheels in one piece with reinforcing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with cooling provisions

Definitions

  • the invention relates to a grinding wheel with an opening in the region of the axis of rotation and this opening on both sides of the grinding wheel, extending in the radial direction mounting areas, so that the grinding wheel between the clamping flanges of a grinding machine is clamped, wherein at least one attachment area in the radial direction is followed by an area having a plurality of projections.
  • the invention relates to a method for producing a grinding wheel according to the preamble of claim 13 (see eg EP-A-1 704 966 ).
  • the grinding wheel of granules and tissue deposits is built up in layers and pressed in a metal mold.
  • the metal mold also has to have a corresponding crank. After pressing, the disc is removed from the mold, clamped between hardened in the same shape metal plates and cured.
  • vibrations occur which adversely affect the running of the grinding wheel. These vibrations can subsequently be transferred to the grinding machine and the user.
  • the object of the invention is therefore to provide a grinding wheel of the type mentioned, in which the disadvantages of the prior art are reduced, in particular a grinding wheel is to be provided with reduced in operation vibration behavior.
  • a grinding wheel according to claim 1 the protrusions are made of injection-molded plastic, a smooth running occurs during operation of the grinding wheel with a grinding machine (eg angle grinder), vibrations are absorbed by the plastic protrusions or ribs.
  • a grinding machine eg angle grinder
  • these projections are arranged in the case of a grinding disc on the back of the grinding wheel, i. on the side facing away from the grinding layer.
  • the projections could be approximately elongated.
  • the stabilization effect is further increased if the projections enclose an angle other than zero with the radius of the grinding wheel, ideally such an angle is in the range of 5 to 30 °, preferably 10 to 20 °, especially preferably at about 15 °.
  • "twisted" protrusions or ribs reduce the vibration behavior of the grinding wheels.
  • the projections may be arranged radially symmetrically about the axis of rotation, that is, when the grinding wheel is rotated about the axis of rotation by a certain angle ⁇ , the projections are again congruent with the original arrangement.
  • the angle of the radial symmetry is preferably between 10 ° and 50 °, particularly preferably 20 ° to 40 °. Practical test results have shown that optimum results were achieved with a radial symmetry of 360 ° / n, where n is a prime number. This prevents the formation of vibration axes. An irregular arrangement of the projections may be advantageous to avoid vibration axes. It is further provided that the entire area in which plastic projections are arranged, consists of sprayed plastic.
  • both mounting areas consists of sprayed-on plastic.
  • both attachment areas are made of sprayed plastic or is the attachment area of completely surrounded by a plastic layer.
  • at least one of injection-molded plastic mounting area and the plastic projections having area integrally formed since in this way vibrations are distributed particularly effectively on the entire grinding wheel and are degraded by the damping effect of the plastic layer.
  • both mounting areas, the wall of the bore and the area carrying the projections are made in one piece, this being a simple, separate abrasive-free layer of plastic which extends over the base body of the grinding wheel.
  • the effect according to the invention is particularly pronounced if at least the region (attachment region) clamped by the clamping flanges and the region comprising the plastic projections are formed as a preferably one-piece plastic layer.
  • the opening is encapsulated by the at least one plastic layer, ie, when the plastic layers of the two sides are connected to one another, whereby vibrations are distributed particularly evenly.
  • the plastic is a thermoplastic material. It can be provided that the areas of plastic form a hub for attachment of the grinding wheel to a grinding machine. However, it is also conceivable to apply metal sleeves or receptacles to the plastic area in order to obtain a stabilized hub. The plastic areas in any case reduce the vibration of the grinding wheel and give a better grip on the grinding machine. It would be conceivable to apply the flange directly on the plastic layer or interpose a metal sleeve. However, eliminating the metal sleeve provides a cost advantage and can more quickly manufacture the grinding wheel.
  • the fastening areas or the area clamped by the clamping flanges is arranged at least partially substantially perpendicular to the axis of rotation. It is particularly favorable if both attachment areas or the areas clamped by the clamping flanges are arranged at least in regions essentially at right angles to the axis of rotation.
  • a Kröpf Scheme connects to the attachment areas, ie, that the grinding wheel is offset in the axial direction and a part of the surface of the grinding wheel corresponds to a truncated cone or the mantle of a truncated cone.
  • the projections on the Kröpf Kunststoff truncated cone area
  • plastic from the group PA, POM, PE, PP, TPU, ABS, PET, PS, PMMA, silicone, rubber or a processed wood based injection molding compound or mixtures thereof.
  • a grinding wheel according to the present invention may be prefabricated according to a conventional manufacturing process, until subsequently the plastic part is preferably added by injection molding.
  • the grinding wheel can be manufactured contrary to the normal design without metal eyelets in the bore area.
  • a grinding area of binder and abrasive grain incorporated therein is manufactured and in a second step the prefabricated grinding wheel provided with a recess in the region of the axis of rotation is inserted into a mold of the injection molding machine.
  • the molding tool of the injection molding machine has a cavity for the prefabricated grinding wheel.
  • protrusions made of plastic are sprayed onto the prefabricated grinding wheel by injecting thermoplastic plasticized plastic.
  • the cavity could be designed such that the grinding wheel is encapsulated in such a way that the opening is surrounded by plastic.
  • the cavity outside the area in which the arranged perpendicular to the axis of rotation abutment portion of the clamping flanges should have recesses, so that upon injection of the thermoplastic material in the tool and in the recesses projections on the Grinding wheel are formed. It is advantageous if the mounting area for the clamping flanges of a grinding machine are also encapsulated with plastic. Furthermore, it is advantageous if the wall of the opening is encapsulated in plastic.
  • the Fig. 1 discloses a view of the front side 3 of an embodiment of a circular grinding wheel 1.
  • the grinding wheel 1 has an abrasive layer 9 or a grinding area on the front side 3.
  • the attachment area 5 connects directly to the opening 2 and is approximately circular in shape.
  • the attachment region 5 is arranged essentially at right angles to the axis of rotation A.
  • the embodiment shown corresponds to a sanding pad, which has a crank in the axial direction, with a Kröpf Scheme 11.
  • the actual grinding wheel 1 is surrounded by a plastic layer 10 in the region of the opening 2, wherein the plastic layer 10 on the front side 3 over the Kröpfungs Society 11, the mounting area 5, the wall of the opening 2 to the back 4 ( please refer Fig. 2 ). Furthermore, the plastic layer 10 extends beyond the rear attachment region 6 to the rear crimping region (corresponding to the region 7), on which the projections 8 are arranged. As well as out Fig. 5 As can be seen, the thickness d of the plastic layer 10 is between 5 and 15% of the thickness D of the grinding wheel 1 at the respectively measured location.
  • the region 5 of the plastic layer 10 is arranged at right angles to the axis of rotation A.
  • the fastening region 5 surrounds the opening 2 in an annular manner and directly and is arranged plane-parallel to the abrasive layer surface 9.
  • Fig. 2 is the back 4 of the grinding wheel 1 of Fig. 1 recognizable.
  • the plastic layer 10 extends over the bore 2 onto the rear side 4 and grips the opening 2.
  • the attachment region 6, which is also annular in shape the plastic layer 10 on the surface is also (as in the attachment region 5) at right angles to the axis of rotation A and plane parallel to the abrasive layer 9 (and thus of course also to the attachment area 5).
  • a shaft of a grinding machine is inserted through the opening 2 of the grinding wheel 1 and a front and rear flange is applied to the grinding wheel 1, this flange should ideally not cover more than the attachment areas 5 and 6 respectively.
  • the Fig. 3 shows a view of the back 4 of the grinding wheel 1.
  • the projections 8 which are rib-shaped in the embodiment, that is approximately elongated and extend radially symmetrically over the entire circumference.
  • the radial symmetry is 360/13 ° in the embodiment.
  • the projections 8 are formed equidistantly and arranged at a sanding pad conveniently on the side facing away from the grinding surface 9 (back 4). It has proven favorable to apply approximately 5 to 20 projections 8 to the grinding wheel 1.
  • the projections 8 are arranged in the region of the crank 11 and close in plan view to the radius R an angle ⁇ of about 15 °.
  • the radially outermost edge of the respective projection 8 with the point of contact with the corresponding radius R (which passes through the axis of rotation) is determined and then the vector of the direction of the greatest longitudinal extent of the projection 8 is determined.
  • the angle enclosed by the radius and the vector corresponds to the angle ⁇ .
  • the Fig. 4 shows the cross section along the line Q2-Q2 of Fig. 3 ,
  • the entire cross-sectional area of the grinding wheel 1 is made of binder, abrasive grain and reinforcing fabric, and only in the opening area 2 and in the outer areas 5, 6, 7 is the grinding wheel 1 surrounded by the plastic layer 10.
  • the Magnification of Fig. 4 shows in Fig. 5 in that the plastic layer 10 extends from the front side 3 to the back side 4 and has been applied (sprayed) onto the grinding wheel 1 in one piece.
  • the grinding wheel 1 After normal curing, the grinding wheel 1 is clamped in an injection mold.
  • the tension occurs in such a way that the flat area of the disks is fixed in the injection molding tool, while the cranked area is surrounded by a cavity with a gap width of about 0.3 to 3 mm.
  • the cavity also recesses for stiffening ribs, etc. may be located. It is advantageous if the mold finishes as clean as possible with the adjacent them disc surfaces to prevent leakage of plastic from the cavity during spraying. It is then injected into the cavity unfilled or filled plastic.
  • the injection molding process is controlled according to the invention so that the material temperature at the time when the flowing plastic reaches the last cavities in the cavity is already very close to its solidification temperature.
  • the Fig. 6 shows an essential process step in the manufacture of a grinding wheel according to the invention 1. Shown is a cross section of a mold 27 of an injection molding machine, in which a prefabricated cranked grinding wheel 1 (grinding disc) is inserted.
  • the mold 27 includes a plurality of mold parts 22, 28, 29 defining a cavity.
  • the grinding wheel 1 is inserted between the mold parts 28 and 29 and is partially (e) positively to the mold parts 28, 29, so that no plastic to the substantially form-fitting enclosed areas (especially the grinding areas 9 on the front 3 but also on the Back 4) of the grinding wheel 1 can penetrate.
  • Formally means within the meaning of the invention that the disc rests without a gap and only due to unevenness smaller, not fitting Areas remain free.
  • a gap between grinding wheel 1 and mold parts 28, 29 remains free, so that a cavity 20 is formed, can be injected into the plastic mass.
  • the grinding wheel is not form-fitting (forming a gap) on the mold 27, since the mounting portions 5, 6 are to be made of plastic.
  • the area (d) is used for radial enlargement of the plastic area on the grinding wheel 1 and for additional vibration damping.
  • the bore or opening 2 of the prefabricated grinding wheel 1 is manufactured in contrast to conventional grinding wheels with a larger by about 0.4 mm to about 20 mm in diameter, depending on the thickness of the plastic layer 10 should have.
  • the prefabricated grinding wheel 1 is inserted into the mold and centered by peripheral clamping devices 26 (in the best case, at least 3 such clamping devices 26 are provided). In the region of the opening 2 of the grinding wheel 1, a cylindrical mold part 22 is provided.
  • plasticized plastic mass is injected into the cavity 20.
  • a and / or b marked areas is in the finished grinding wheel 1 normally a clamping flange of a grinding machine for clamping the grinding wheel 1 at.
  • a plastic layer 10 is applied, which in the preferred example then corresponds to those areas 5, 6 which are arranged at right angles to the axis of rotation A.
  • the regions 5, 6 in the finished grinding wheel 1 are both parallel to one another and plane-parallel to the grinding region 9.
  • the difficulty lies in the fact that the grinding wheel 1 during the injection process in the cranked area is not suppressed, since any deformation would lead to springing back after opening the mold and defective geometry. It is therefore advantageous if the grinding wheel 1 does not bear against the molding tool in the entire region of the cranking. Furthermore, it is advantageous to inject the plastic via radially arranged nozzles from the cylindrical mold part 22 (bore molding) into the mold. Also conceivable is injection via axially arranged hot runner nozzles in the mold part 28. After the injection process and sufficient solidification of the injection mold, the mold is opened and the finished grinding wheel 1 is removed.
  • plastics such as PA (polyamide), POM (polyoxymethylene), PE (Polyethylene), PP (polypropylene), TPU (thermoplastic polyurethane), ABS (aryl nitrile-butadiene-styrene) copolymer), PET (polyethylene terephthalate), PS (rolystyrene), PMMA (polymethyl methacrylate), silicone, rubber or on recycled wood based injection molding composition advantageous, but the invention is not limited thereto.
  • PA polyamide
  • POM polyoxymethylene
  • PE Polyethylene
  • PP polypropylene
  • TPU thermoplastic polyurethane
  • ABS aryl nitrile-butadiene-styrene copolymer
  • PET polyethylene terephthalate
  • PS rolystyrene
  • PMMA polymethyl methacrylate
  • silicone rubber or on recycled wood based injection molding composition advantageous, but the invention is not limited thereto.
  • Fig. 7 shows a section of the mold part 28. According to Fig. 6 this view would correspond to a view from the bottom up. Visible is the area b, which later forms the contact area, the area c, which is inclined and which corresponds to the offset of the grinding wheel 1. In this area c, the region 7, which is essential to the invention, with the projections 8 will later be located in the finished grinding wheel 1. Visible are also three depressions 12, which later cause the projections 8 during injection of plasticized plastic mass. The region d is adjoined by the region d, in which the grinding wheel later likewise does not form-fit with the formation of a gap, so that a further plastic region is formed for additional stabilization. In the area e, the grinding wheel 1 is in a substantially form-fitting manner when being inserted, because no plastic mass is intended to penetrate these areas later.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The grinding wheel (1) has an opening in a region of a rotary axis (A), and fastening regions surrounding the opening in both sides of the grinding wheel. The fastening regions extend in a radial direction such that the grinding wheel is placed between wheel flanges of a grinding machine. A region (7) comprising projections (8) is attached to the fastening regions in the radial direction, where the fastening regions and the projections are composed of plastic. Thee projections are arranged around the rotary axis in a radially symmetric manner. An independent claim is also included for a method for manufacturing a grinding wheel.

Description

Die Erfindung betrifft eine Schleifscheibe mit einer Öffnung im Bereich der Drehachse und diese Öffnung beidseitig der Schleifscheibe umgebende, sich in radialer Richtung erstreckende Befestigungsbereiche, sodass die Schleifscheibe zwischen den Spannflanschen einer Schleifmaschine einspannbar ist, wobei an zumindest einen Befestigungsbereich in radialer Richtung ein Bereich anschließt, der mehrere Vorsprünge aufweist.The invention relates to a grinding wheel with an opening in the region of the axis of rotation and this opening on both sides of the grinding wheel, extending in the radial direction mounting areas, so that the grinding wheel between the clamping flanges of a grinding machine is clamped, wherein at least one attachment area in the radial direction is followed by an area having a plurality of projections.

Weiters betrifft die Erfindung ein Verfahren zur Herstellung einer Schleifscheibe gemäß Oberbegriff des Anspruchs 13 (siehe z.B. die EP-A-1 704 966 ).Furthermore, the invention relates to a method for producing a grinding wheel according to the preamble of claim 13 (see eg EP-A-1 704 966 ).

Bei herkömmliche Schleifscheiben, insbesondere bei so genannten Schleiftellern oder Schruppscheiben, wird die Schleifscheibe aus Granulat und Gewebeeinlagen schichtweise aufgebaut und in einer Metallform verpresst. Bei der Herstellung eines Schleiftellers mit Kröpfung hat die Metallform ebenfalls eine entsprechende Kröpfung aufzuweisen. Nach dem Pressen wird die Scheibe aus der Form entnommen, zwischen in gleicher Form gekröpfte Metallplatten eingespannt und ausgehärtet.In conventional grinding wheels, in particular in so-called sanding discs or grinding discs, the grinding wheel of granules and tissue deposits is built up in layers and pressed in a metal mold. In the production of a grinding plate with cranking the metal mold also has to have a corresponding crank. After pressing, the disc is removed from the mold, clamped between hardened in the same shape metal plates and cured.

Beim Betrieb solcher Schleifscheiben treten Vibrationen auf, die den Lauf der Schleifscheibe negativ beeinflussen. Diese Vibrationen können sich in weiterer Folge auf die Schleifmaschine und den Benutzer übertragen.During operation of such grinding wheels, vibrations occur which adversely affect the running of the grinding wheel. These vibrations can subsequently be transferred to the grinding machine and the user.

Aufgabe der Erfindung ist es daher, eine Schleifscheibe der eingangs genannten Gattung bereitzustellen, bei der die Nachteile des Standes der Technik vermindert sind, insbesondere soll eine Schleifscheibe mit im Betrieb verringertem Vibrationsverhalten bereitgestellt werden.The object of the invention is therefore to provide a grinding wheel of the type mentioned, in which the disadvantages of the prior art are reduced, in particular a grinding wheel is to be provided with reduced in operation vibration behavior.

Diese Aufgabe wird durch eine Schleifscheibe gemäß Anspruch 1 gelöst. Indem bei einer Schleifscheibe der eingangs genannten Gattung die Vorsprünge aus aufgespritztem Kunststoff bestehen, kommt es beim Betrieb der Schleifscheibe mit einer Schleifmaschine (z.B. Winkelschleifer) zu einem ruhigen Lauf, Vibrationen werden von den Kunststoffvorsprüngen bzw. Rippen absorbiert.This object is achieved by a grinding wheel according to claim 1. In the case of a grinding wheel of the type mentioned at the outset, the protrusions are made of injection-molded plastic, a smooth running occurs during operation of the grinding wheel with a grinding machine (eg angle grinder), vibrations are absorbed by the plastic protrusions or ribs.

Zwar sind Schleifscheiben mit Vorsprüngen aus Metall ( DE 197 53 618 A1 ) oder dem Grundmaterial der Schleifscheibe ( EP 1 704 966 A2 ) bereits bekannt. Diese weisen allerdings den Nachteil auf, dass die Rippen die Schleifscheibe versteifen und im Betrieb - insbesondere bei Schleifgut mit unregelmäßiger Oberfläche - Vibrationen noch stärker auf die Schleifmaschine bzw. den Benutzer übertragen werden.Although grinding wheels with projections made of metal ( DE 197 53 618 A1 ) or the base material of the grinding wheel ( EP 1 704 966 A2 ) already known. However, these have the disadvantage that the ribs stiffen the grinding wheel and vibrations are transmitted even more to the grinding machine or the user - especially in abrasive material with irregular surface.

Bevorzugt sind diese Vorsprünge im Falle eines Schleiftellers auf der Rückseite der Schleifscheibe angeordnet, d.h. auf der der Schleifschicht abgewandten Seite. Die Vorsprünge könnten dabei etwa länglich ausgebildet sein. Bei einer länglichen Ausbildung der Vorsprünge wird die Wirkung der Stabilisierung noch weiter erhöht, wenn die Vorsprünge mit dem Radius der Schleifscheibe einen Winkel ungleich Null einschließen, idealerweise liegt ein solcher Winkel im Bereich von 5 bis 30°, bevorzugt zwischen 10 und 20°, besonders bevorzugt bei etwa 15°. Zusätzlich vermindern "gedrehte" Vorsprünge oder Rippen das Schwingungsverhalten der Schleifscheiben.Preferably, these projections are arranged in the case of a grinding disc on the back of the grinding wheel, i. on the side facing away from the grinding layer. The projections could be approximately elongated. In an elongated configuration of the projections, the stabilization effect is further increased if the projections enclose an angle other than zero with the radius of the grinding wheel, ideally such an angle is in the range of 5 to 30 °, preferably 10 to 20 °, especially preferably at about 15 °. In addition, "twisted" protrusions or ribs reduce the vibration behavior of the grinding wheels.

Die Vorsprünge können dabei radialsymmetrisch um die Drehachse angeordnet sein, d.h., wenn die Schleifscheibe um die Drehachse um einen bestimmten Winkel α gedreht wird, sind die Vorsprünge wieder deckungsgleich zur ursprünglichen Anordnung. Der Winkel der Radialsymmetrie beträgt bevorzugt zwischen 10° und 50°, besonders bevorzugt 20° bis 40°. Praktische Untersuchungsergebnisse haben gezeigt, dass optimale Ergebnisse bei einer Radialsymmetrie von 360°/n, wobei n eine Primzahl ist, erzielt wurden. Dies verhindert die Ausbildung von Schwingungsachsen. Auch eine unregelmäßige Anordnung der Vorsprünge kann zur Vermeidung von Schwingungsachsen vorteilhaft sein. Weiters ist vorgesehen, dass der gesamte Bereich, in dem Kunststoffvorsprünge angeordnet sind, aus aufgespritztem Kunststoff besteht.The projections may be arranged radially symmetrically about the axis of rotation, that is, when the grinding wheel is rotated about the axis of rotation by a certain angle α, the projections are again congruent with the original arrangement. The angle of the radial symmetry is preferably between 10 ° and 50 °, particularly preferably 20 ° to 40 °. Practical test results have shown that optimum results were achieved with a radial symmetry of 360 ° / n, where n is a prime number. This prevents the formation of vibration axes. An irregular arrangement of the projections may be advantageous to avoid vibration axes. It is further provided that the entire area in which plastic projections are arranged, consists of sprayed plastic.

Typischerweise entstehen beim Fertigungsprozess von Schleiftellern mit Kröpfung nach Stand der Technik Spannungen und Verzug im Bereich der Scheibenkröpfung, wodurch es zu einem unruhigeren Lauf der Scheibe und in weiterer Folge zu ungleichmäßiger Schleifleistung bzw. Abtrag kommt.Typically, in the manufacturing process of grinding plates with cranking according to the prior art, tensions and distortion in the area of the disk cranking, resulting in a restless running of the disc and subsequently to uneven grinding performance or removal occurs.

Daher hat es ich als günstig erwiesen, wenn zumindest ein Befestigungsbereich aus aufgespritztem Kunststoff besteht. Besonders bevorzugt sind beide Befestigungsbereiche aus aufgespritztem Kunststoff gefertigt bzw. ist der Befestigungsbereich von einer Kunststoffschicht vollständig umgeben. Im Idealfall sind zumindest ein aus aufgespritztem Kunststoff bestehender Befestigungsbereich und der Kunststoffvorsprünge aufweisende Bereich einstückig ausgebildet, da auf diese Art Vibrationen besonders wirkungsvoll auf die gesamte Schleifscheibe verteilt werden und durch den dämpfenden Effekt der Kunststoffschicht abgebaut werden. Im einfachsten Fall sind beide Befestigungsbereiche, die Wandung der Bohrung und der die Vorsprünge tragende Bereich aus einem Stück gefertigt, wobei dies eine einfache, gesonderte schleifmittelfreie Schicht aus Kunststoff ist, die sich über den Grundkörper der Schleifscheibe ersteckt. Der erfindungsgemäße Effekt ist dabei besonders ausgeprägt, wenn zumindest der von den Spannflanschen eingespannte Bereich (Befestigungsbereich) und der Kunststoffvorsprünge aufweisende Bereich als vorzugsweise einstückige Kunststoffschicht ausgebildet sind.Therefore, it has proved to be favorable if at least one mounting area consists of sprayed-on plastic. Particularly preferably, both attachment areas are made of sprayed plastic or is the attachment area of completely surrounded by a plastic layer. Ideally, at least one of injection-molded plastic mounting area and the plastic projections having area integrally formed, since in this way vibrations are distributed particularly effectively on the entire grinding wheel and are degraded by the damping effect of the plastic layer. In the simplest case, both mounting areas, the wall of the bore and the area carrying the projections are made in one piece, this being a simple, separate abrasive-free layer of plastic which extends over the base body of the grinding wheel. The effect according to the invention is particularly pronounced if at least the region (attachment region) clamped by the clamping flanges and the region comprising the plastic projections are formed as a preferably one-piece plastic layer.

Weiters ist es besonders vorteilhaft, wenn die Öffnung von der wenigstens einen Kunststoffschicht umspritzt ist, dh, wenn die Kunststoffschichten der beiden Seiten miteinander verbunden sind, wodurch Vibrationen besonders gleichmäßig verteilt werden.Furthermore, it is particularly advantageous if the opening is encapsulated by the at least one plastic layer, ie, when the plastic layers of the two sides are connected to one another, whereby vibrations are distributed particularly evenly.

Eine solche Ausführung bietet sich auch aufgrund des weiter unten vorgeschlagenen Herstellungsverfahrens an, gemäß dem die Kunststoffschichten durch Spritzgießen hergestellt werden. Aus Stabilitäts- und Fertigungsgründen hat es sich als vorteilhaft erwiesen, wenn der Kunststoff ein thermoplastischer Kunststoff ist. Es kann vorgesehen sein, dass die Bereiche aus Kunststoff eine Nabe zur Befestigung der Schleifscheibe an einer Schleifmaschine bilden. Allerdings ist es auch denkbar, Metallhülsen oder Steckhülsen auf den Kunststoffbereich aufzubringen, um eine stabilisierte Nabe zu erhalten. Die Kunststoffbereiche vermindern in jedem Fall die Vibration der Schleifscheibe und vermitteln einen besseren Halt an der Schleifmaschine. Es wäre denkbar den Flansch unmittelbar auf der Kunststoffschicht anzulegen oder eine Metallhülse zwischenzuschalten. Allerdings erzielt man durch das Weglassen der Metallhülse einen Kostenvorteil und kann die Schleifscheibe rascher fertigen.Such an embodiment is also suitable because of the production method proposed below, according to which the plastic layers are produced by injection molding. For stability and manufacturing reasons, it has proven to be advantageous if the plastic is a thermoplastic material. It can be provided that the areas of plastic form a hub for attachment of the grinding wheel to a grinding machine. However, it is also conceivable to apply metal sleeves or receptacles to the plastic area in order to obtain a stabilized hub. The plastic areas in any case reduce the vibration of the grinding wheel and give a better grip on the grinding machine. It would be conceivable to apply the flange directly on the plastic layer or interpose a metal sleeve. However, eliminating the metal sleeve provides a cost advantage and can more quickly manufacture the grinding wheel.

Um den Lauf der Schleifscheibe im Betrieb zu verbessern und ein Taumeln der Scheibe beinahe vollständig zu unterbinden, ist es günstig, wenn die Befestigungsbereiche oder der von den Spannflanschen eingespannte Bereich zumindest bereichsweise im Wesentlichen rechtwinkelig zur Drehachse angeordnet ist. Besonders günstig ist es, wenn beide Befestigungsbereiche oder die von den Spannflanschen eingespannten Bereiche zumindest bereichsweise im Wesentlichen rechtwinkelig zur Drehachse angeordnet sind.In order to improve the operation of the grinding wheel during operation and to almost completely prevent wobbling of the disk, it is favorable if the fastening areas or the area clamped by the clamping flanges is arranged at least partially substantially perpendicular to the axis of rotation. It is particularly favorable if both attachment areas or the areas clamped by the clamping flanges are arranged at least in regions essentially at right angles to the axis of rotation.

Weiters kann vorgesehen sein, dass an die Befestigungsbereiche ein Kröpfbereich anschließt, dh, dass die Schleifscheibe in axialer Richtung versetzt ist und ein Teil der Oberfläche der Schleifscheibe einem Kegelstumpf bzw. dem Mantel eines Kegelstumpfes entspricht. Bei einer solchen Ausgestaltung der Schleifscheibe hat es sich als besonders vorteilhaft erwiesen, wenn die Vorsprünge auf dem Kröpfbereich (Kegelstumpfbereich) angeordnet sind.Furthermore, it can be provided that a Kröpfbereich connects to the attachment areas, ie, that the grinding wheel is offset in the axial direction and a part of the surface of the grinding wheel corresponds to a truncated cone or the mantle of a truncated cone. In such an embodiment of the grinding wheel, it has proved to be particularly advantageous if the projections on the Kröpfbereich (truncated cone area) are arranged.

Als günstig hat es sich erwiesen, wenn der Kunststoff aus der Gruppe PA, POM, PE, PP, TPU, ABS, PET, PS, PMMA, Silikon, Kautschuk oder einer auf aufbereitetem Holz basierenden Spritzgussmasse oder Mischungen daraus stammt.It has proved to be advantageous if the plastic from the group PA, POM, PE, PP, TPU, ABS, PET, PS, PMMA, silicone, rubber or a processed wood based injection molding compound or mixtures thereof.

Eine Schleifscheibe gemäß der vorliegenden Erfindung kann nach herkömmlichem Herstellungsprozess vorgefertigt werden, bis anschließend das Kunststoffteil vorzugsweise durch Spritzgießen hinzugefügt wird. Die Schleifscheibe kann entgegen der normalen Ausführung ohne Metallösen im Bohrungsbereich gefertigt werden.A grinding wheel according to the present invention may be prefabricated according to a conventional manufacturing process, until subsequently the plastic part is preferably added by injection molding. The grinding wheel can be manufactured contrary to the normal design without metal eyelets in the bore area.

Die eingangs gestellte Aufgabe wird auch durch ein Verfahren gemäß dem unabhängigen Verfahrensanspruch gelöst, Dabei ist vorgesehen, dass in einem ersten Schritt ein Schleifbereich aus Bindemittel und darin eingebundenem Schleifkorn gefertigt wird und in einem zweiten Schritt die mit einer Ausnehmung im Bereich der Drehachse versehene vorgefertigte Schleifscheibe in ein Formwerkzeug der Spritzgießmaschine eingelegt wird. Das Formwerkzeug der Spritzgießmaschine weist eine Kavität für die vorgefertigte Schleifscheibe auf. In einem dritten Schritt werden auf die vorgefertigte Schleifscheibe durch Einspritzen von thermoplastischem plastifizierten Kunststoff Vorsprünge aus Kunststoff aufgespritzt. Dabei könnte die Kavität derart ausgebildet sein, dass die Schleifscheibe derart umspritzt wird, dass die Öffnung von Kunststoff eingefasst wird. Um die oben beschriebenen Vorsprünge auf dem Kunststoff zu erzeugen, sollte die Kavität außerhalb des Bereichs, in dem der rechtwinkelig zur Drehachse angeordnete Anlagebereich der Spannflansche gespritzt wird, Ausnehmungen aufweisen, sodass beim Einspritzen des thermoplastischen Kunststoffs in das Werkzeug und in die Ausnehmungen Vorsprünge auf der Schleifscheibe gebildet werden. Günstig ist es dabei, wenn die Befestigungsbereich für die Spannflansche einer Schleifmaschine ebenfalls mit Kunststoff umspritzt werden. Weiters ist es günstig, wenn die Wandung der Öffnung mit Kunststoff umspritzt wird.The object stated in the introduction is also achieved by a method according to the independent method claim. It is provided that in a first step a grinding area of binder and abrasive grain incorporated therein is manufactured and in a second step the prefabricated grinding wheel provided with a recess in the region of the axis of rotation is inserted into a mold of the injection molding machine. The molding tool of the injection molding machine has a cavity for the prefabricated grinding wheel. In a third step, protrusions made of plastic are sprayed onto the prefabricated grinding wheel by injecting thermoplastic plasticized plastic. In this case, the cavity could be designed such that the grinding wheel is encapsulated in such a way that the opening is surrounded by plastic. In order to produce the above-described projections on the plastic, the cavity outside the area in which the arranged perpendicular to the axis of rotation abutment portion of the clamping flanges should have recesses, so that upon injection of the thermoplastic material in the tool and in the recesses projections on the Grinding wheel are formed. It is advantageous if the mounting area for the clamping flanges of a grinding machine are also encapsulated with plastic. Furthermore, it is advantageous if the wall of the opening is encapsulated in plastic.

Weitere Vorteile und Details der Erfindung ergeben sich aus den unten angefügten Figuren und Figurenbeschreibungen. Es zeigt:

Fig.1
eine erfindungsgemäße Schleifscheibe in Schrägriss mit Blick auf die Vorderseite,
Fig. 2
die Schleifscheibe von Fig. 1 mit Blick auf die Rückseite,
Fig. 3
eine Ansicht auf die Hinterseite der Schleifscheibe,
Fig. 4
einen Querschnitt längs der Schnittlinie Q2-Q2 von Fig. 3,
Fig. 5
die Detailansicht markiert mit X aus der Fig. 4,
Fig. 6
einen erfindungsgemäßen Verfahrensschritt zur Herstellung einer Schleifscheibe und
Fig. 7
eine Draufsicht auf ein Formwerkzeugteil zur Durchführung eines erfindungsgemäßen Verfahrens.
Further advantages and details of the invention will become apparent from the attached figures and description of the figures. It shows:
Fig.1
a grinding wheel according to the invention in oblique view facing the front,
Fig. 2
the grinding wheel of Fig. 1 facing the back,
Fig. 3
a view of the back of the grinding wheel,
Fig. 4
a cross section along the section line Q2-Q2 of Fig. 3 .
Fig. 5
the detail view marked with X from the Fig. 4 .
Fig. 6
a method step according to the invention for producing a grinding wheel and
Fig. 7
a plan view of a mold part for performing a method according to the invention.

Die Fig. 1 offenbart einen Blick auf die Vorderseite 3 eines Ausführungsbeispieles einer kreisförmigen Schleifscheibe 1. Mittig im Bereich der Drehachse A ist eine Öffnung 2 zur Befestigung der Schleifscheibe 1 an einer (nicht gezeigten) Schleifmaschine erkennbar. Die Schleifscheibe 1 weist auf der Vorderseite 3 eine Schleifschicht 9 bzw. einen Schleifbereich auf. Erkennbar ist der Befestigungsbereich 5, an dem später ein Spannflansch einer Schleifmaschine anliegen kann. Der Befestigungsbereich 5 schließt unmittelbar an die Öffnung 2 an und ist etwa kreisringförmig ausgebildet. Außerdem ist der Befestigungsbereich 5 im Wesentlichen rechtwinklig zur Drehachse A angeordnet. Das gezeigte Ausführungsbeispiel entspricht einem Schleifteller, der in axialer Richtung eine Kröpfung aufweist, mit einem Kröpfbereich 11. Dieser ist etwa kegelstumpfförmig ausgebildet bzw. entspricht der Mantelfläche eines Kegelstumpfes. Insgesamt ist erkennbar, dass die eigentliche Schleifscheibe 1 von einer Kunststoffschicht 10 im Bereich der Öffnung 2 eingefasst ist, wobei sich die Kunststoffschicht 10 auf der Vorderseite 3 über den Kröpfungsbereich 11, den Befestigungsbereich 5, die Wandung der Öffnung 2 bis auf die Rückseite 4 (siehe Fig. 2) erstreckt. Weiters erstreckt sich die Kunststoffschicht 10 über den hinteren Befestigungsbereich 6 bis zum hinteren Kröpfbereich (der dem Bereich 7 entspricht), auf dem die Vorsprünge 8 angeordnet sind. Wie auch aus Fig. 5 hervorgeht, beträgt die Dicke d der Kunststoffschicht 10 zwischen 5 und 15% der Dicke D der Schleifscheibe 1 an der jeweils gemessenen Stelle. Der Bereich 5 der Kunststoffschicht 10 ist im rechten Winkel zur Drehachse A angeordnet. lm vorliegenden Fall umgibt der Befestigungsbereich 5 kreisringförmig und unmittelbar die Öffnung 2 und ist planparallel zur Schleifschichtoberfläche 9 angeordnet.The Fig. 1 discloses a view of the front side 3 of an embodiment of a circular grinding wheel 1. In the center of the axis of rotation A, an opening 2 for fixing the grinding wheel 1 to a grinding machine (not shown) can be seen. The grinding wheel 1 has an abrasive layer 9 or a grinding area on the front side 3. Visible is the attachment area 5, on which later a clamping flange of a grinding machine can rest. The attachment region 5 connects directly to the opening 2 and is approximately circular in shape. In addition, the attachment region 5 is arranged essentially at right angles to the axis of rotation A. The embodiment shown corresponds to a sanding pad, which has a crank in the axial direction, with a Kröpfbereich 11. This is formed approximately frusto-conical or corresponds to the lateral surface of a truncated cone. Overall, it can be seen that the actual grinding wheel 1 is surrounded by a plastic layer 10 in the region of the opening 2, wherein the plastic layer 10 on the front side 3 over the Kröpfungsbereich 11, the mounting area 5, the wall of the opening 2 to the back 4 ( please refer Fig. 2 ). Furthermore, the plastic layer 10 extends beyond the rear attachment region 6 to the rear crimping region (corresponding to the region 7), on which the projections 8 are arranged. As well as out Fig. 5 As can be seen, the thickness d of the plastic layer 10 is between 5 and 15% of the thickness D of the grinding wheel 1 at the respectively measured location. The region 5 of the plastic layer 10 is arranged at right angles to the axis of rotation A. In the present case, the fastening region 5 surrounds the opening 2 in an annular manner and directly and is arranged plane-parallel to the abrasive layer surface 9.

In Fig. 2 ist die Rückseite 4 der Schleifscheibe 1 von Fig. 1 erkennbar. Die Kunststoffschicht 10 reicht wie bereits erwähnt über die Bohrung 2 hindurch auf die Rückseite 4 und fasst die Öffnung 2 ein. Im Befestigungsbereich 6, der ebenfalls kreisringförmig ausgebildet ist, ist die Kunststoffschicht 10 an der Oberfläche ebenfalls (wie auch beim Befestigungsbereich 5) im rechten Winkel zur Drehachse A bzw. planparallel zur Schleifschicht 9 (und somit natürlich auch zum Befestigungsbereich 5). Wenn nun eine Welle einer Schleifmaschine durch die Öffnung 2 der Schleifscheibe 1 gesteckt wird und ein vorderer und hinterer Flansch auf die Schleifscheibe 1 angelegt wird, so sollte dieser Flansch im Idealfall nicht mehr als die Befestigungsbereiche 5 bzw. 6 überdecken. Die Fig. 3 zeigt eine Ansicht der Rückseite 4 der Schleifscheibe 1. Gut erkennbar sind die Vorsprünge 8, die im Ausführungsbeispiel rippenförmig, also etwa länglich ausgebildet sind und sich radialsymmetrisch über den gesamten Umfang erstrecken. Die Radialsymmetrie beträgt im Ausführungsbeispiel 360/13°. Auch sind die Vorsprünge 8 äquidistant ausgebildet und bei einem Schleifteller günstigerweise auf der der Schleiffläche 9 abgewandten Seite (Rückseite 4) angeordnet. Günstig hat es sich erwiesen, etwa 5 bis 20 Vorsprünge 8 auf die Schleifscheibe 1 aufzubringen. Die Vorsprünge 8 sind im Bereich der Kröpfung 11 angeordnet und schließen in Draufsicht zum Radius R einen Winkel α von etwa 15° einschließen. Dabei wird zuerst der radial am weitesten außenliegende Rand des jeweiligen Vorsprunges 8 mit den Berührungspunkt zum entsprechenden Radius R (der durch die Drehachse geht) ermittelt und dann der Vektor der Richtung der größten Längserstreckung des Vorsprunges 8 ermittelt. Der vom Radius und vom Vektor eingeschlossene Winkel entspricht dem Winkel α.In Fig. 2 is the back 4 of the grinding wheel 1 of Fig. 1 recognizable. As already mentioned, the plastic layer 10 extends over the bore 2 onto the rear side 4 and grips the opening 2. In the attachment region 6, which is also annular in shape, the plastic layer 10 on the surface is also (as in the attachment region 5) at right angles to the axis of rotation A and plane parallel to the abrasive layer 9 (and thus of course also to the attachment area 5). Now, if a shaft of a grinding machine is inserted through the opening 2 of the grinding wheel 1 and a front and rear flange is applied to the grinding wheel 1, this flange should ideally not cover more than the attachment areas 5 and 6 respectively. The Fig. 3 shows a view of the back 4 of the grinding wheel 1. Well visible are the projections 8, which are rib-shaped in the embodiment, that is approximately elongated and extend radially symmetrically over the entire circumference. The radial symmetry is 360/13 ° in the embodiment. Also, the projections 8 are formed equidistantly and arranged at a sanding pad conveniently on the side facing away from the grinding surface 9 (back 4). It has proven favorable to apply approximately 5 to 20 projections 8 to the grinding wheel 1. The projections 8 are arranged in the region of the crank 11 and close in plan view to the radius R an angle α of about 15 °. In this case, first the radially outermost edge of the respective projection 8 with the point of contact with the corresponding radius R (which passes through the axis of rotation) is determined and then the vector of the direction of the greatest longitudinal extent of the projection 8 is determined. The angle enclosed by the radius and the vector corresponds to the angle α.

Die Fig. 4 zeigt den Querschnitt längs der Linie Q2-Q2 der Fig. 3. Im Wesentlichen ist der gesamte Querschnittsbereich der Schleifscheibe 1 aus Bindemittel, Schleifkorn und Verstärkungsgewebe gefertigt und nur im Öffnungsbereich 2 und in den äußeren Bereichen 5, 6, 7 ist die Schleifscheibe 1 von der Kunststoffschicht 10 umgeben. Die Vergrößerung von Fig. 4 zeigt in Fig. 5, dass die Kunststoffschicht 10 sich von der Vorderseite 3 auf die Rückseite 4 erstreckt und in einem Stück auf die Schleifscheibe 1 aufgebracht (aufgespritzt) wurde.The Fig. 4 shows the cross section along the line Q2-Q2 of Fig. 3 , In essence, the entire cross-sectional area of the grinding wheel 1 is made of binder, abrasive grain and reinforcing fabric, and only in the opening area 2 and in the outer areas 5, 6, 7 is the grinding wheel 1 surrounded by the plastic layer 10. The Magnification of Fig. 4 shows in Fig. 5 in that the plastic layer 10 extends from the front side 3 to the back side 4 and has been applied (sprayed) onto the grinding wheel 1 in one piece.

Nach dem normalen Aushärten wird die Schleifscheibe 1 in ein Spritzgusswerkzeug eingespannt. Die Spannung passiert in der Art, dass der flache Bereich der Scheiben im Spritzgusswerkzeug fixiert ist, während der gekröpfte Bereich von einer Kavität mit ca. 0,3 bis 3 mm Spaltbreite umgeben ist. In der Kavität können sich auch Ausnehmungen für Versteifungsrippen, etc. befinden. Vorteilhaft ist, wenn die Form möglichst sauber mit den an sie anliegenden Scheibenflächen abschließt, um ein Austreten von Kunststoff aus der Kavität beim Spritzen zu verhindern. Es wird anschließend in die Kavität unverfüllter oder verfüllter Kunststoff eingespritzt. Der Spritzgussvorgang wird gemäß der Erfindung so gesteuert, dass die Materialtemperatur zu dem Zeitpunkt, wo der fließende Kunststoff die letzten Hohlräume in der Kavität erreicht, bereits sehr nahe seiner Erstarrungstemperatur ist. Dadurch, dass der oben beschriebene Formschluss zwischen Schleifscheibe und Spritzgusswerkzeug aufgrund der Rauheit einer Schleifscheibe selten in komplett dichter Ausführung gewährleistet werden kann, steuert man den Spritzgießprozess und damit Temperatur und Plastifizierungsgrad des Kunststoffes derart, dass in Abhängigkeit von Zeitpunkt und Ort des Erstarrens der Spritzgussmasse sichergestellt ist, sodass kein Material in die Fugen zwischen der Schleifscheibe und dem sie spannenden Spritzgusswerkzeug eintritt. Damit wird verhindert, dass der zum Schleifen verwendete Bereich mit Kunststoff bedeckt wird, darüber hinaus kann eine entsprechende Optik erzielt werden. Die Fig. 6 zeigt einen wesentlichen Verfahrensschritt bei der Herstellung einer erfindungsgemäßen Schleifscheibe 1. Gezeigt ist ein Querschnitt eines Formwerkzeugs 27 einer Spritzgießmaschine, in das eine vorgefertigte gekröpfte Schleifscheibe 1 (Schleifteller) eingelegt ist. Erkennbar ist nur eine Hälfte der Schleifscheibe 1 in Querschnitt. Das Formwerkzeug 27 umfasst mehrere Formwerkzeugteile 22, 28, 29, die eine Kavität definieren. Die Schleifscheibe 1 wird zwischen die Formwerkzeugteile 28 und 29 eingelegt und liegt bereichsweise (e) formschlüssig an den Formwerkzeugteilen 28, 29 an, sodass kein Kunststoff an die im Wesentlichen formschlüssig umschlossenen Bereiche (insbesondere auch die Schleifbereiche 9 an der Vorderseite 3 aber auch an der Rückseite 4) der Schleifscheibe 1 dringen kann. (Formschlüssig meint im Sinne der Erfindung, dass die Scheibe spaltfrei anliegt und nur aufgrund von Unebenheiten kleinere, nicht anliegende Bereiche frei bleiben.) Im Bereich der Öffnung 2 und der Kröpfung (c) der Schleifscheibe 1 bleibt ein Spalt zwischen Schleifscheibe 1 und Formwerkzeugteilen 28, 29 frei, sodass eine Kavität 20 gebildet wird, in die Kunststoffmasse eingespritzt werden kann. Auch in den Bereichen (a) und (b) liegt die Schleifscheibe nicht formschlüssig (unter Bildung eines Spaltes) am Formwerkzeug 27 an, da auch die Befestigungsbereiche 5, 6 aus Kunststoff gefertigt werden sollen. Der Bereich (d) dient zur radialen Vergrößerung des Kunststoffbereichs an der Schleifscheibe 1 und zur zusätzlichen Vibrationsdämpfung. Die Bohrung bzw. Öffnung 2 der vorgefertigten Schleifscheibe 1 wird im Gegensatz zu herkömmlichen Schleifscheiben mit einem um etwa 0,4 mm bis ca. 20 mm größeren Durchmesser gefertigt, je nachdem welche Dicke die Kunststoffschicht 10 aufweisen soll. Die vorgefertigte Schleifscheibe 1 wird in die Form eingelegt und von umfangseitigen Spannvorrichtungen 26 zentriert (im günstigen Fall sind zumindest 3 solche Spannvorrichtungen 26 vorgesehen). Im Bereich der Öffnung 2 der Schleifscheibe 1 ist ein zylinderförmiges Formwerkzeugteile 22 vorgesehen. Durch einen nicht gezeigten Einspritzkanal wird plastifizierte Kunststoffmasse in die Kavität 20 eingespritzt. In den in der Fig. 6 mit a und/oder b gekennzeichneten Bereichen liegt bei der fertigen Schleifscheibe 1 im Normalfall ein Spannflansch einer Schleifmaschine zum Einspannen der Schleifscheibe 1 an. Zumindest auf die Bereiche a, b wird also eine Kunststoffschicht 10 aufgebracht, die im bevorzugten Beispiel dann jenen Bereichen 5, 6 entspricht, die rechtwinklig zur Drehachse A angeordnet sind. Im gezeigten Ausführungsbeispiel sind die Bereiche 5, 6 bei der fertigen Schleifscheibe 1 sowohl parallel zueinander als auch planparallel zum Schleifbereich 9. Da Schleifscheiben in Relation zu den beim Spritzgießen auftretenden Kräften einen sehr niedrigen Elastizitätsmodul aufweisen, liegt die Schwierigkeit darin, dass die Schleifscheibe 1 während des Spritzvorganges im gekröpften Bereich nicht verdrückt wird, da jegliche Deformation zu einem Zurückfedern nach Öffnen des Formwerkzeuges und mangelhafter Geometrie führen würde. Es ist daher günstig, wenn die Schleifscheibe 1 im gesamten Bereich der Kröpfung nicht am Formwerkzeug anliegt. Weiters ist es vorteilhaft, den Kunststoff über radial angeordnete Düsen aus dem zylinderförmigen Formwerkzeugteil 22 (Bohrungs-Formteil) in die Form einzuspritzen. Denkbar ist auch eine Einspritzung über axial angeordnete Heißkanaldüsen im Formwerkzeugteil 28. Nach dem Spritzvorgang und ausreichendem Erstarren des Spritzgutes wird das Formwerkzeug geöffnet und die fertige Schleifscheibe 1 entnommen. Zum Umspritzen der Schleifscheibe 1 ist der Einsatz von Kunststoffen wie PA (Polyamid), POM (Polyoxymethylen), PE (Polyethylen), PP (Polypropylen), TPU (Thermoplastisches Polyurethan), ABS (Arylnitril-Butadien-Styrol)-Copolymerisat), PET (Polyethylenterephthalat), PS (Rolystyrol), PMMA (Polymethylmethacrylat), Silikon, Kautschuk oder eine auf aufbereitetem Holz basierende Spritzgussmasse vorteilhaft, die Erfindung aber nicht darauf beschränkt.After normal curing, the grinding wheel 1 is clamped in an injection mold. The tension occurs in such a way that the flat area of the disks is fixed in the injection molding tool, while the cranked area is surrounded by a cavity with a gap width of about 0.3 to 3 mm. In the cavity also recesses for stiffening ribs, etc. may be located. It is advantageous if the mold finishes as clean as possible with the adjacent them disc surfaces to prevent leakage of plastic from the cavity during spraying. It is then injected into the cavity unfilled or filled plastic. The injection molding process is controlled according to the invention so that the material temperature at the time when the flowing plastic reaches the last cavities in the cavity is already very close to its solidification temperature. Due to the fact that the above-described form fit between the grinding wheel and the injection molding tool can rarely be ensured in completely sealed design due to the roughness of a grinding wheel, the injection molding process and thus the temperature and degree of plasticization of the plastic are controlled in such a way that the injection molding compound is ensured depending on the time and place of solidification so that no material enters the joints between the grinding wheel and the exciting injection molding tool. This prevents that the area used for grinding is covered with plastic, in addition, a corresponding optics can be achieved. The Fig. 6 shows an essential process step in the manufacture of a grinding wheel according to the invention 1. Shown is a cross section of a mold 27 of an injection molding machine, in which a prefabricated cranked grinding wheel 1 (grinding disc) is inserted. Recognizable is only one half of the grinding wheel 1 in cross section. The mold 27 includes a plurality of mold parts 22, 28, 29 defining a cavity. The grinding wheel 1 is inserted between the mold parts 28 and 29 and is partially (e) positively to the mold parts 28, 29, so that no plastic to the substantially form-fitting enclosed areas (especially the grinding areas 9 on the front 3 but also on the Back 4) of the grinding wheel 1 can penetrate. (Formally means within the meaning of the invention that the disc rests without a gap and only due to unevenness smaller, not fitting Areas remain free.) In the region of the opening 2 and the crank (c) of the grinding wheel 1, a gap between grinding wheel 1 and mold parts 28, 29 remains free, so that a cavity 20 is formed, can be injected into the plastic mass. Also in the areas (a) and (b), the grinding wheel is not form-fitting (forming a gap) on the mold 27, since the mounting portions 5, 6 are to be made of plastic. The area (d) is used for radial enlargement of the plastic area on the grinding wheel 1 and for additional vibration damping. The bore or opening 2 of the prefabricated grinding wheel 1 is manufactured in contrast to conventional grinding wheels with a larger by about 0.4 mm to about 20 mm in diameter, depending on the thickness of the plastic layer 10 should have. The prefabricated grinding wheel 1 is inserted into the mold and centered by peripheral clamping devices 26 (in the best case, at least 3 such clamping devices 26 are provided). In the region of the opening 2 of the grinding wheel 1, a cylindrical mold part 22 is provided. By an injection channel, not shown, plasticized plastic mass is injected into the cavity 20. In the in the Fig. 6 With a and / or b marked areas is in the finished grinding wheel 1 normally a clamping flange of a grinding machine for clamping the grinding wheel 1 at. At least on the areas a, b, therefore, a plastic layer 10 is applied, which in the preferred example then corresponds to those areas 5, 6 which are arranged at right angles to the axis of rotation A. In the exemplary embodiment shown, the regions 5, 6 in the finished grinding wheel 1 are both parallel to one another and plane-parallel to the grinding region 9. Since grinding wheels have a very low modulus of elasticity in relation to the forces occurring during injection molding, the difficulty lies in the fact that the grinding wheel 1 during the injection process in the cranked area is not suppressed, since any deformation would lead to springing back after opening the mold and defective geometry. It is therefore advantageous if the grinding wheel 1 does not bear against the molding tool in the entire region of the cranking. Furthermore, it is advantageous to inject the plastic via radially arranged nozzles from the cylindrical mold part 22 (bore molding) into the mold. Also conceivable is injection via axially arranged hot runner nozzles in the mold part 28. After the injection process and sufficient solidification of the injection mold, the mold is opened and the finished grinding wheel 1 is removed. For encapsulation of the grinding wheel 1 is the use of plastics such as PA (polyamide), POM (polyoxymethylene), PE (Polyethylene), PP (polypropylene), TPU (thermoplastic polyurethane), ABS (aryl nitrile-butadiene-styrene) copolymer), PET (polyethylene terephthalate), PS (rolystyrene), PMMA (polymethyl methacrylate), silicone, rubber or on recycled wood based injection molding composition advantageous, but the invention is not limited thereto.

Fig. 7 zeigt einen Ausschnitt auf das Formwerkzeugteil 28. Gemäß Fig. 6 würde diese Ansicht einem Blick von unten nach oben entsprechen. Erkennbar ist der Bereich b, der später den Anlagebereich bildet, der Bereich c, der geneigt ist und der der Kröpfung der Schleifscheibe 1 entspricht. In diesem Bereich c wird später bei der fertigen Schleifscheibe 1 der erfindungswesentliche Bereich 7 mit den Vorsprüngen 8 gelegen sein. Erkennbar sind außerdem drei Vertiefungen 12, die später beim Einspritzen von plastifizierter Kunststoffmasse die Vorsprünge 8 verursachen. An den Bereich c schließt der Bereich d an, in dem die Schleifscheibe später ebenfalls unter Spaltbildung nicht formschlüssig anschließt, sodass ein weiterer Kunststoffbereich zur zusätzlichen Stabilisierung gebildet wird. Im Bereich e liegt die Schleifscheibe 1 beim Einlegen im Wesentlichen formschlüssig an, denn an diese Bereiche soll später keine Kunststoffmasse dringen. Fig. 7 shows a section of the mold part 28. According to Fig. 6 this view would correspond to a view from the bottom up. Visible is the area b, which later forms the contact area, the area c, which is inclined and which corresponds to the offset of the grinding wheel 1. In this area c, the region 7, which is essential to the invention, with the projections 8 will later be located in the finished grinding wheel 1. Visible are also three depressions 12, which later cause the projections 8 during injection of plasticized plastic mass. The region d is adjoined by the region d, in which the grinding wheel later likewise does not form-fit with the formation of a gap, so that a further plastic region is formed for additional stabilization. In the area e, the grinding wheel 1 is in a substantially form-fitting manner when being inserted, because no plastic mass is intended to penetrate these areas later.

Durch die beschriebene Umspritzung der Schleifscheibe 1 wird ein sauberer Planlauf der Schleifscheibe 1 erzielt, wie er nach dem herkömmlichen Fertigungsverfahren nicht gewährleistet werden kann.The described encapsulation of the grinding wheel 1, a clean axial run of the grinding wheel 1 is achieved, as he can not be guaranteed by the conventional manufacturing process.

Claims (15)

  1. A grinding wheel having an opening in the region in the axis of rotation and fastening regions which surround that opening on both sides of the grinding wheel and extend in the radial direction so that the grinding wheel can be clamped between the clamping flanges of a grinding machine, wherein adjoining at least one fastening region (5, 6) in the radial direction is a region (7) having a plurality of projections (8), characterised in that the projections (8) comprise plastic material injection-moulded thereon.
  2. A grinding wheel according to claim 1 characterised in that the projections (8) are of a substantially elongate configuration.
  3. A grinding wheel according to claim 2 characterised in that the projections (8) include an angle (α) of 0° to 30°, preferably 10° to 20°, with the radius (R) of the grinding wheel (1).
  4. A grinding wheel according to one of claims 1 to 3 characterised in that the projections (8) are arranged radially symmetrically around the axis of rotation (A).
  5. A grinding wheel according to claim 4 characterised in that the angle of the radial symmetry is 360°/n, wherein n is a prime number.
  6. A grinding wheel according to one of claims 1 to 5 characterised in that the entire region (7) comprises preferably integral plastic material injection-moulded thereon.
  7. A grinding wheel according to one of claims 1 to 6 characterised in that at least one fastening region (5, 6) comprises plastic material injection-moulded thereon.
  8. A grinding wheel according to one of claims 1 to 7 characterised in that plastic material is injection-moulded around the opening (2).
  9. A grinding wheel according to claim 7 or claim 8 characterised in that both fastening regions (5, 6) comprise plastic material injection-moulded thereon.
  10. A grinding wheel according to one of claims 7 to 9 characterised in that the at least one fastening region (5, 6) comprising injection-moulded plastic material and the region (7) having projections (8) of injection-moulded plastic material is formed integrally.
  11. A grinding wheel according to one of claims 1 to 10 characterised in that a cranked region adjoins the fastening regions (5, 6).
  12. A grinding wheel according to claim 11 characterised in that the region (7) having the projections (8) is provided on the cranked region.
  13. A process for the production of a grinding wheel, including regions of plastic material, in particular according to one of claims 1 to 12, wherein in a first step a grinding region (3) is formed from binding agent and abrasive grain bound therein, characterised in that in a second step the prefabricated grinding wheel (1) which is provided with an opening (2) in the region of the axis of rotation (A) is placed in a mould tool of an injection-moulding machine, wherein the mould tool has a cavity for the prefabricated grinding wheel (1), and that in a third step projections (7) are injection-moulded on to the prefabricated grinding wheel (1) by the injection of plasticised, thermoplastic material.
  14. A method according to claim 13 characterised in that the fastening regions (5, 6) for the clamping flanges of a grinding machine have plastic material injection-moulded therearound.
  15. A method according to claim 13 or claim 14 characterised in that plastic material is injection-moulded around the wall of the opening (2).
EP08006716A 2007-04-20 2008-04-02 Grinding wheel Active EP1982796B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0061807A AT505124B1 (en) 2007-04-20 2007-04-20 WHEEL

Publications (2)

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EP1982796A1 EP1982796A1 (en) 2008-10-22
EP1982796B1 true EP1982796B1 (en) 2010-06-23

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EP (1) EP1982796B1 (en)
AT (2) AT505124B1 (en)
DE (1) DE502008000810D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5560112B2 (en) * 2010-06-23 2014-07-23 日本レヂボン株式会社 Reinforcement pad with rotating elastic grinding wheel and reinforcement structure with pad
AT520966A1 (en) 2018-03-12 2019-09-15 Tyrolit Schleifmittelwerke Swarovski Kg Grinding tool for grinding an engine block

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753618C2 (en) 1997-12-03 1999-11-04 Diewe Diamantwerkzeuge Gmbh Cutting wheel
ITMO20050005U1 (en) * 2005-03-23 2006-09-21 Giovanni Ficai PERFECTED CUTTING WHEEL

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DE502008000810D1 (en) 2010-08-05
AT505124B1 (en) 2010-02-15
EP1982796A1 (en) 2008-10-22
AT505124A1 (en) 2008-11-15
ATE471792T1 (en) 2010-07-15

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