EP1982796A1 - Grinding wheel - Google Patents
Grinding wheel Download PDFInfo
- Publication number
- EP1982796A1 EP1982796A1 EP08006716A EP08006716A EP1982796A1 EP 1982796 A1 EP1982796 A1 EP 1982796A1 EP 08006716 A EP08006716 A EP 08006716A EP 08006716 A EP08006716 A EP 08006716A EP 1982796 A1 EP1982796 A1 EP 1982796A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding wheel
- plastic
- region
- projections
- grinding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004033 plastic Substances 0.000 claims abstract description 67
- 229920003023 plastic Polymers 0.000 claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000001746 injection moulding Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 5
- 239000006061 abrasive grain Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000002788 crimping Methods 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 8
- -1 ABS Polymers 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 229930040373 Paraformaldehyde Natural products 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 229920006324 polyoxymethylene Polymers 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000012815 thermoplastic material Substances 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000004413 injection moulding compound Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 206010038743 Restlessness Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Images
Classifications
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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 surrounding, extending in the radial direction mounting areas, so that the grinding wheel between the clamping flanges of a grinding machine can be clamped.
- the invention relates to a method for producing a grinding wheel.
- the grinding wheel of granules and fabric inserts 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 In the case of a grinding wheel of the type mentioned above, at least one attachment area is adjoined by an area which has a plurality of protrusions made of 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 ,
- 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 plastic.
- both attachment areas are made of plastic or the attachment area is completely surrounded by a plastic layer.
- at least one existing plastic mounting area and the Kunststoffstaffvorsprünge having area integrally formed, as in this way vibrations particularly effective on the entire Grinding wheel are distributed and 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 when at least the region (fixing region) clamped by the clamping flanges and the region having the plastic protrusions are formed as a preferably one-piece plastic layer.
- the opening is bordered 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 regions or the region clamped by the clamping flanges is arranged at least in regions essentially at right angles 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
- the areas are injection-molded from plastic. Therefore, it is advantageous if the plastic comprises a thermoplastic material. It has proved to be favorable when 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.
- a sharpening disc 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 embedded abrasive grain is made and in a second step, which is provided with a recess in the region of the axis of rotation prefabricated grinding wheel 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
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.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 surrounding, extending in the radial direction mounting areas, so that the grinding wheel between the clamping flanges of a grinding machine can be clamped.
Weiters betrifft die Erfindung ein Verfahren zur Herstellung einer Schleifscheibe.Furthermore, the invention relates to a method for producing a grinding wheel.
Bei herkömmlichen 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 ausgehärtetIn conventional grinding wheels, especially in so-called sanding discs or grinding discs, the grinding wheel of granules and fabric inserts 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. lndem bei einer Schleifscheibe der eingangs genannten Gattung an zumindest einem Befestigungsbereich ein Bereich anschließt, der mehrere Vorsprünge aus Kunststoff aufweist, 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
Zwar sind Schleifscheiben mit Vorsprüngen aus Metall bereits bekannt (zB aus der
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 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 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 disk cranking, resulting in a restless running of the disc and subsequently to uneven grinding performance and removal occurs.
Daher hat es ich als günstig erwiesen, wenn zumindest ein Befestigungsbereich aus Kunststoff besteht. Besonders bevorzugt sind beide Befestigungsbereiche aus Kunststoff gefertigt bzw. ist der Befestigungsbereich von einer Kunststoffschicht vollständig umgeben. Im Idealfall sind zumindest ein aus Kunststoff bestehender Befestigungsbereich und der Kunststaffvorsprünge 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 erstreckt. Der erfindungsgemäße Effekt ist dabei besonders ausgeprägt, wenn zumindest der von den Spannflanschen eingespannte Bereich (Befestigungsbereich) und der Künststoffvorsprünge aufweisende Bereich als vorzugsweise einstückige Kunststoffschicht ausgebildet sind.Therefore, it has proven to me favorable if at least one mounting area made of plastic. Particularly preferably, both attachment areas are made of plastic or the attachment area is completely surrounded by a plastic layer. Ideally, at least one existing plastic mounting area and the Kunststaffvorsprünge having area integrally formed, as in this way vibrations particularly effective on the entire Grinding wheel are distributed and 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 when at least the region (fixing region) clamped by the clamping flanges and the region having the plastic protrusions are formed as a preferably one-piece plastic layer.
Weiters ist es besonders vorteilhaft, wenn die Öffnung von der wenigstens einen Kunststoffschicht eingefasst 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 bordered 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 running of the grinding wheel during operation and to almost completely prevent tumbling of the disk, it is favorable if the fastening regions or the region clamped by the clamping flanges is arranged at least in regions essentially at right angles 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.
Eine vorteilhafte Ausführungsvariante sieht vor, dass die Bereiche aus Kunststoff spritzgegossen sind. Daher ist es vorteilhaft, wenn der Kunststoff einen thermoplastischen Kunststoff umfasst. Als günstig hat es sich dabei 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.An advantageous embodiment provides that the areas are injection-molded from plastic. Therefore, it is advantageous if the plastic comprises a thermoplastic material. It has proved to be favorable when 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 Schfeifscheibe 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 sharpening disc 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 set out above 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 embedded abrasive grain is made and in a second step, which is provided with a recess in the region of the axis of rotation prefabricated grinding wheel 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.
- 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
In
Die
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
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
Claims (15)
Applications Claiming Priority (1)
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AT0061807A AT505124B1 (en) | 2007-04-20 | 2007-04-20 | WHEEL |
Publications (2)
Publication Number | Publication Date |
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EP1982796A1 true EP1982796A1 (en) | 2008-10-22 |
EP1982796B1 EP1982796B1 (en) | 2010-06-23 |
Family
ID=39691118
Family Applications (1)
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EP08006716A Active EP1982796B1 (en) | 2007-04-20 | 2008-04-02 | Grinding wheel |
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EP (1) | EP1982796B1 (en) |
AT (2) | AT505124B1 (en) |
DE (1) | DE502008000810D1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012006099A (en) * | 2010-06-23 | 2012-01-12 | Nippon Resibon Corp | Reinforcement pad of rotary elastic grindstone and structure reinforced by pad |
CN110253429A (en) * | 2018-03-12 | 2019-09-20 | 蒂罗利特磨料机械斯沃罗夫斯基两合公司 | For being ground the grinding tool of engine cylinder body |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19753618A1 (en) | 1997-12-03 | 1999-06-17 | Diewe Diamantwerkzeuge Gmbh | Parting grinding disk |
EP1704966A2 (en) * | 2005-03-23 | 2006-09-27 | Giovanni Ficai | Cutting wheel |
-
2007
- 2007-04-20 AT AT0061807A patent/AT505124B1/en active
-
2008
- 2008-04-02 DE DE502008000810T patent/DE502008000810D1/en active Active
- 2008-04-02 AT AT08006716T patent/ATE471792T1/en active
- 2008-04-02 EP EP08006716A patent/EP1982796B1/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19753618A1 (en) | 1997-12-03 | 1999-06-17 | Diewe Diamantwerkzeuge Gmbh | Parting grinding disk |
EP1704966A2 (en) * | 2005-03-23 | 2006-09-27 | Giovanni Ficai | Cutting wheel |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012006099A (en) * | 2010-06-23 | 2012-01-12 | Nippon Resibon Corp | Reinforcement pad of rotary elastic grindstone and structure reinforced by pad |
CN110253429A (en) * | 2018-03-12 | 2019-09-20 | 蒂罗利特磨料机械斯沃罗夫斯基两合公司 | For being ground the grinding tool of engine cylinder body |
US11969852B2 (en) | 2018-03-12 | 2024-04-30 | Tyrolit—Schleifmittelwerke Swarovski AG & Co K.G. | Grinding tool for grinding an engine block |
Also Published As
Publication number | Publication date |
---|---|
AT505124B1 (en) | 2010-02-15 |
EP1982796B1 (en) | 2010-06-23 |
DE502008000810D1 (en) | 2010-08-05 |
AT505124A1 (en) | 2008-11-15 |
ATE471792T1 (en) | 2010-07-15 |
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