EP2708326B1 - Flap grinding disc - Google Patents

Flap grinding disc Download PDF

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Publication number
EP2708326B1
EP2708326B1 EP13003275.8A EP13003275A EP2708326B1 EP 2708326 B1 EP2708326 B1 EP 2708326B1 EP 13003275 A EP13003275 A EP 13003275A EP 2708326 B1 EP2708326 B1 EP 2708326B1
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EP
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Prior art keywords
abrasive
flap disc
grain
grinding
flap
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EP13003275.8A
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German (de)
French (fr)
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EP2708326A3 (en
EP2708326B8 (en
EP2708326A2 (en
Inventor
Gerd Eisenblätter
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PPR GmbH
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PPR GmbH
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Priority claimed from DE102012021267.4A external-priority patent/DE102012021267B4/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
    • B24D13/16—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face comprising pleated flaps or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/28—Resins or natural or synthetic macromolecular compounds

Definitions

  • the invention relates to a flap disc with a carrier plate and a fan-like and applied to a central opening on the carrier plate abrasive flaps made of abrasive cloth, comprising a base fabric and applied to the base fabric abrasive grain.
  • Generic flap discs are known from the prior art and, for example, in the DE 85 20 750 U1 , in the DE 299 10 931 U1 , in the DE 20 2004 005 538 U1 and in the FR 2 832 088 A1 to which reference is hereby made for the construction and use of generic flap discs.
  • Essential elements of such a flap disc are a carrier plate and on the carrier plate around a central opening in the carrier plate around fan-like and overlapping applied abrasive discs. Via the central opening within the carrier plate, the connection of the flap disc is made to a suitable drive machine.
  • the usually rectangular, for example, square, abrasive flaps consist of an abrasive cloth having abrasive grain carried by a backing fabric.
  • the abrasive grain often comprises so-called oxide ceramics, such as the high-performance ceramics zirconium dioxide (ZrO 2 ) and aluminum oxide (Al 2 O 3 ), in particular in the form of the rhombohedral modification ( ⁇ -Al 2 O 3 , corundum).
  • oxide ceramics such as the high-performance ceramics zirconium dioxide (ZrO 2 ) and aluminum oxide (Al 2 O 3 ), in particular in the form of the rhombohedral modification ( ⁇ -Al 2 O 3 , corundum).
  • the object of the invention is therefore to provide a flap disc, which allows optimal utilization of the grinding potential of a flap disc and at the same time has lower production costs.
  • the abrasive grain is a grain mixture consisting of 25% to 75% zirconia (ZrO 2 ) and 25% to 75% alumina (Al 2 O 3 ).
  • the grain mixture thus consists exclusively of these two constituents, which are mixed together in a predetermined ratio to 100% of the grain mixture used.
  • the percentages given here describe proportions in terms of mass per volume or volume per volume, but especially in terms of mass per mass.
  • the range data used in each case means inclusive information, that is, the specified range limits are expressly included in the invention. This applies not only to the range data used in this paragraph, but also to the entire description of the invention.
  • a reduced number of grinding blades per flap disc is complementary to the use of special grain mixture optimal.
  • the carrier plate is equipped with a total of 30 to 46 grinding lamellae per flap disc. Due to the low number of grinding lamellae, these can be arranged at a substantially smaller angle of attack relative to the support surface of the carrier plate, whereby outstanding grinding results are made possible. Only in this particular inventive number range of grinding blades per carrier plate succeeds together with the above specific composition of the two-component grain mixture optimum utilization of the grinding potential of a flap disc.
  • the present invention is thus characterized by the special interaction between the defined composition of the two-component grain mixture used and the number of this grinding mixture having abrasive slats per carrier plate.
  • the specific design of a flap disc taking into account only these two factors “number of abrasive flaps" and “ratio of the two abrasive grain constituents zirconia and alumina" according to the above explanations lead to flap discs with outstanding properties in terms of life, grinding performance and efficiency.
  • the grain mixture of the abrasive grain is from 50% to 75% and more preferably from 70% to 75% zirconia and from 25% to 50%, and more preferably from 25% to 30% alumina. These proportions of the two abrasive grain components has proven to be particularly suitable.
  • the grain mixture provided according to the invention unfolds its full grinding potential at grain sizes of 40, 50 or 60, in particular 50, according to the CAMI grain size specification (Coated Abrasive Manufacturing Institute) .
  • These grit size data denote a grain mixture having an average particle diameter of 425 .mu.m, 50 a grain mixture having an average particle diameter of 348 .mu.m and 60 a grain mixture having an average particle diameter of 265 .mu.m.
  • An assembly of the carrier plate with 34 to 40 grinding lamellae is also preferred in view of the overall performance of a flapper disc according to the invention.
  • Optimal angles of attack of the individual grinding lamellae with respect to the outer surface of the carrier plate are in the range between 3 ° and 13 °, in particular in the range between 9 ° and 12 °. These comparatively flat angles of incidence of the surface plane of the grinding lamella relative to the support surface of the carrier plate provide optimum utilization results of the grinding potential of the grinding lamellae of a lamellar grinding wheel.
  • all grinding lamellae of a lamellar grinding wheel are arranged with the same angle of attack on the carrier plate and in comparison to the each adjacent grinding blades each offset by the same angular amount relative to the axis of rotation of the disk grinding wheel.
  • the abrasive cloth usually comprises a base fabric to which the grain mixture is applied.
  • the base fabric thus serves as a carrier for the grain mixture.
  • the base fabric preferably consists of polyester or of a mixture of polyester and cotton.
  • the abrasive fabric may have further additives, for example for bonding the abrasive grain to the base fabric and / or for modifying the abrasive properties of the flap disc.
  • the abrasive fabric contains calcium carbonate (CaCO 3 ) as filler.
  • the abrasive fabric ideally comprises phenolic resin as a binder.
  • the proportions of the components present in the abrasive fabric can vary within a wide range. However, it has proved to be advantageous for obtaining optimum grinding results and long service intervals when the proportion of the two components of the grain mixture with respect to the total abrasive fabric is in certain ranges. Ideally, the proportion of the grain mixture per se is 25% to 70% of the total weight of the abrasive cloth.
  • the zirconia mass fraction at the abrasive fabric is from 20% to 50%, more preferably from 25% to 35% and most preferably from 30% to 32%, and the weight percent alumina at the abrasive fabric is from 6% to 20%, more preferably 6% to 15% and especially at 7% to 10%.
  • flap discs having a diameter in the range between 110 mm and 130 mm.
  • the diameter of the flap disc according to the above embodiments is preferably 115 mm or 125 mm.
  • the diameter of the flap disc is the edge distance between two points lying on the edge of the flap disc, whose connecting line runs through the axis of rotation of the flap disc.
  • the individual grinding blades are according to the invention between 24 mm to 30 mm wide. Preferably, they are between 24 mm to 25 mm wide with a pulley diameter of 115 mm and preferably 27 mm to 30 mm wide with a pulley diameter of 125 mm.
  • the individual grinding blades are also additionally or alternatively preferably 19 mm to 26 mm long. In this case, abrasive slats with the same dimensions are preferably used for a flap grinding wheel.
  • Essential elements of the flap wheel 1 are a circular disc-shaped carrier plate 2 with a through hole 3 and on the grinding side of the flap wheel 1 on the outside of the carrier plate 2 arranged abrasive slats 4.
  • the individual grinding blades 4 are rectangular and overlapping fan-like and circular, the through hole 3 circumferentially to the outer edge the carrier plate 2 with the carrier plate 2, for example via adhesive bonds, connected.
  • the flap disc has a diameter D of 125 mm.
  • the flapper disc 1 can also indentations for receiving a fastening nut, in particular in the region of the passage opening 3, fastening means, such as a thread, or more in such prior art flap discs used in the art and on the in Fig. 1 have stated basic structure beyond characteristics.
  • Fig. 2 is a cross-sectional view taken along the line II Fig. 1 ,
  • the individual abrasive lamellae 4 consist of an abrasive cloth 8, comprising a base fabric 6 and applied to the base fabric 6 abrasive grain 7, which for reasons of clarity in Fig. 2 is shown as a layer and concretely comprises a plurality of abrasive grains, in the present embodiment having an average particle size of 348 microns (grain size 50 according to CAMI).
  • the grinding blades 4 are arranged overlapping each other around the center of the passage opening 3.
  • Fig. 1 The individual abrasive lamellae 4 consist of an abrasive cloth 8, comprising a base fabric 6 and applied to the base fabric 6 abrasive grain 7, which for reasons of clarity in Fig. 2 is shown as a layer and concretely comprises a plurality of abrasive grains, in the present embodiment having an average particle size of 348 microns (grain size 50 according to CAMI).
  • the entirety of the abrasive flaps 4 is shown as an abrasive flake layer 4 ', and the single abrasive flake 4 a is exemplified Fig. 1 indicated in this layer.
  • the flat grinding blades 4 are inclined ⁇ with an angle of attack relative to the circular Outer surface or support surface O of the carrier plate 2 is arranged.
  • the support surface O is a substantially transversely to the axis of rotation R of the flap wheel 1 extending support surface on the support plate 2.
  • the total of 36 grinding blades 4 are uniformly formed and each uniformly distributed at an angular distance of 10 ° to each other around the axis of rotation R of the flap wheel 1.
  • the abrasive cloth 8 comprises, in addition to a grain mixture consisting of a mixture of zirconium oxide and aluminum oxide, further constituents, such as, for example, calcium carbonate as filler and phenolic resin as binder.
  • the grain mixture of the abrasive grain consists of 70% zirconium oxide and 30% aluminum oxide, based on the mass fractions of the two components in the total mass of the grain mixture.
  • the mass fractions and percent m / m zirconia are 30% and alumina 13%.
  • the further mass fractions of the abrasive cloth 8 are due, inter alia, to the existing polyester base fabric 6 and other ingredients contained in the abrasive fabric 8, such as the filler calcium carbonate and the binder phenolic resin back.
  • a single grinding blade 4 of the grinding blades from the Figures 1 and 2 is also in Fig. 3 indicated in plan view.
  • This single grinding blade 4 has a width B of 28 mm and a length L of 20 mm.

Description

Die Erfindung betrifft eine Fächerschleifscheibe mit einem Trägerteller und fächerartig und um eine zentrale Öffnung auf den Trägerteller aufgebrachten Schleiflamellen aus Schleifgewebe, umfassend ein Grundgewebe und auf dem Grundgewebe aufgebrachtem Schleifkorn.The invention relates to a flap disc with a carrier plate and a fan-like and applied to a central opening on the carrier plate abrasive flaps made of abrasive cloth, comprising a base fabric and applied to the base fabric abrasive grain.

Gattungsgemäße Fächerschleifscheiben sind aus dem Stand der Technik bekannt und beispielsweise in der DE 85 20 750 U1 , in der DE 299 10 931 U1 , in der DE 20 2004 005 538 U1 und in der FR 2 832 088 A1 beschrieben, auf die hiermit hinsichtlich des Aufbaus und der Verwendung von gattungsgemäßen Fächerschleifscheiben Bezug genommen wird. Wesentliche Elemente einer solchen Fächerschleifscheibe sind ein Trägerteller und auf dem Trägerteller um eine zentrale Öffnung im Trägerteller herum fächerartig und einander überlappend aufgebrachte Schleiflamellen. Über die zentrale Öffnung innerhalb des Trägertellers erfolgt die Anbindung der Fächerschleifscheibe an eine geeignete Antriebsmaschine. Die üblicherweise rechteckigen, beispielsweise quadratischen, Schleiflamellen bestehen aus einem Schleifgewebe, das von einem Grundgewebe getragenes Schleifkorn aufweist. Das Schleifkorn umfasst häufig sogenannte Oxidkeramiken, wie beispielsweise der Hochleistungskeramik Zirconiumdioxid (ZrO2) und Aluminiumoxid (Al2O3), insbesondere in Form der rhomboedrischen Modifikation (α-Al2O3; Korund).Generic flap discs are known from the prior art and, for example, in the DE 85 20 750 U1 , in the DE 299 10 931 U1 , in the DE 20 2004 005 538 U1 and in the FR 2 832 088 A1 to which reference is hereby made for the construction and use of generic flap discs. Essential elements of such a flap disc are a carrier plate and on the carrier plate around a central opening in the carrier plate around fan-like and overlapping applied abrasive discs. Via the central opening within the carrier plate, the connection of the flap disc is made to a suitable drive machine. The usually rectangular, for example, square, abrasive flaps consist of an abrasive cloth having abrasive grain carried by a backing fabric. The abrasive grain often comprises so-called oxide ceramics, such as the high-performance ceramics zirconium dioxide (ZrO 2 ) and aluminum oxide (Al 2 O 3 ), in particular in the form of the rhombohedral modification (α-Al 2 O 3 , corundum).

Im Schleifbetrieb nutzen die bisher bekannten Fächerschleifscheiben mit steigender Betriebsdauer verhältnismäßig schnell ab, so dass eine abgenutzte Fächerschleifscheibe häufig durch eine unbenutzte Fächerschleifscheibe ersetzt werden muss, wodurch für den Anwender hohe Kosten entstehen. Um eine befriedigende Nutzungsdauer zu erreichen, ist im Stand der Technik die Bestückung des Trägertellers mit einer verhältnismäßig hohen Anzahl an Schleiflamellen pro Fächerschleifscheibe üblich. Dies ist allerdings insofern nachteilig, als dass dadurch die Herstellungs- und Erwerbskosten einer Fächerschleifscheibe erheblich steigen. Darüber hinaus kann das volle Schleifpotential einer solchen Fächerschleifscheibe häufig nicht vollständig ausgenutzt werden.In grinding operation, the previously known flap discs use relatively quickly with increasing operating time, so that a worn flap disc must be replaced frequently by an unused flap disc, resulting in high costs for the user. In order to achieve a satisfactory service life, in the prior art, the placement of the carrier plate with a relatively high number of grinding lamellae per flap disc is common. However, this is disadvantageous in that thereby the manufacturing and acquisition costs a flap wheel significantly increase. In addition, the full grinding potential of such a flap disc can often not be fully utilized.

Die Aufgabe der Erfindung liegt nun darin, eine Fächerschleifscheibe anzugeben, die eine optimale Ausnutzung des Schleifpotentials einer Fächerschleifscheibe ermöglicht und die gleichzeitig niedrigere Herstellungskosten aufweist.The object of the invention is therefore to provide a flap disc, which allows optimal utilization of the grinding potential of a flap disc and at the same time has lower production costs.

Die Lösung der Aufgabe gelingt mit einer Fächerschleifscheibe gemäß dem unabhängigen Anspruch. Bevorzugte Weiterbildungen sind in den abhängigen Ansprüchen angegeben.The solution of the problem is achieved with a flap disc according to the independent claim. Preferred developments are specified in the dependent claims.

Ein wesentlicher Grundgedanke der Erfindung ist, dass ein optimaler Kompromiss zwischen Wirtschaftlichkeit in der Herstellung der Fächerschleifscheibe und maximaler Ausnutzung des Schleifpotentials einer Fächerschleifscheibe nur durch eine bestimmte Anzahl an Schleiflamellen der Fächerschleifscheibe unter gleichzeitiger Verwendung eines speziellen Schleifkorns gelingt. Erfindungsgemäß ist es vorgesehen, dass das Schleifkorn eine Kornmischung ist, die aus 25% bis 75% Zirconiumdioxid (ZrO2) und aus 25 % bis 75% Aluminiumoxid (Al2O3) besteht. Die Kornmischung besteht somit ausschließlich aus diesen beiden Bestandteilen, die sich im vorgegebenen Verhältnis gemischt zusammen zu 100% der verwendeten Kornmischung ergänzen. Die vorliegend angegebenen Prozentangaben beschreiben dabei Anteilsverhältnisse in Bezug auf Masse pro Volumen oder Volumen pro Volumen, ganz besonders aber in Bezug auf Masse pro Masse. Die verwendeten Bereichsangaben bedeuten dabei jeweils Inklusivangaben, dass heißt die angegebenen Bereichsgrenzen sind ausdrücklich von der Erfindung mit umfasst. Dies gilt nicht nur für die in diesem Absatz verwendeten Bereichsangaben, sondern betrifft die gesamte Beschreibung der Erfindung.An essential basic idea of the invention is that an optimum compromise between cost-effectiveness in the production of the flap disc and maximum utilization of the grinding potential of a flap disc can only be achieved by a specific number of flap discs of the flap disc with simultaneous use of a special abrasive grain. According to the invention, the abrasive grain is a grain mixture consisting of 25% to 75% zirconia (ZrO 2 ) and 25% to 75% alumina (Al 2 O 3 ). The grain mixture thus consists exclusively of these two constituents, which are mixed together in a predetermined ratio to 100% of the grain mixture used. The percentages given here describe proportions in terms of mass per volume or volume per volume, but especially in terms of mass per mass. The range data used in each case means inclusive information, that is, the specified range limits are expressly included in the invention. This applies not only to the range data used in this paragraph, but also to the entire description of the invention.

Ein weiterer wesentlicher Aspekt der Erfindung liegt darin, dass, entgegen der im Stand der Technik bisher bekannten Strategie zur Verbesserung der Leistungsfähigkeit gattungsgemäßer Fächerschleifscheiben, eine verringerte Anzahl an Schleiflamellen pro Fächerschleifscheibe ergänzend zur Verwendung der speziellen Kornmischung optimal ist. Konkret ist es erfindungsgemäß daher vorgesehen, dass der Trägerteller insgesamt mit 30 bis 46 Schleiflamellen pro Fächerschleifscheibe bestückt ist. Durch die niedrige Anzahl an Schleiflamellen können diese in einem wesentlich kleineren Anstellwinkel gegenüber der Auflageoberfläche des Trägertellers angeordnet werden, wodurch herausragende Schleifergebnisse ermöglicht werden. Nur in diesem bestimmten erfindungsgemäßen Anzahlbereich an Schleiflamellen pro Trägerteller gelingt zusammen mit der vorstehend angegebenen spezifischen Zusammensetzung der Zwei-Komponenten-Kornmischung eine optimale Ausnutzung des Schleifpotentials einer Fächerschleifscheibe.Another essential aspect of the invention is that, in contrast to the previously known in the prior art strategy for improving the performance of generic flap discs, a reduced number of grinding blades per flap disc is complementary to the use of special grain mixture optimal. Specifically, it is therefore provided according to the invention that the carrier plate is equipped with a total of 30 to 46 grinding lamellae per flap disc. Due to the low number of grinding lamellae, these can be arranged at a substantially smaller angle of attack relative to the support surface of the carrier plate, whereby outstanding grinding results are made possible. Only in this particular inventive number range of grinding blades per carrier plate succeeds together with the above specific composition of the two-component grain mixture optimum utilization of the grinding potential of a flap disc.

Insgesamt zeichnet sich die vorliegende Erfindung somit durch das spezielle Zusammenspiel zwischen der definierten Zusammensetzung der verwendeten Zwei-Komponenten-Kornmischung und der Anzahl der diese Kornmischung aufweisenden Schleiflamellen pro Trägerteller aus. Die gezielte Ausbildung einer Fächerschleifscheibe unter Berücksichtigung nur dieser beiden Faktoren "Anzahl der Schleiflamellen" und "Verhältnis der beiden Schleifkornbestandteile Zirconiumdioxid und Aluminiumoxid" gemäß den vorstehenden Ausführungen führen zu Fächerschleifscheiben mit herausragenden Eigenschaften hinsichtlich Lebensdauer, Schleifergebnis und Wirtschaftlichkeit.Overall, the present invention is thus characterized by the special interaction between the defined composition of the two-component grain mixture used and the number of this grinding mixture having abrasive slats per carrier plate. The specific design of a flap disc taking into account only these two factors "number of abrasive flaps" and "ratio of the two abrasive grain constituents zirconia and alumina" according to the above explanations lead to flap discs with outstanding properties in terms of life, grinding performance and efficiency.

Idealerweise besteht die Kornmischung des Schleifkorns aus 50% bis 75% und insbesondere aus 70% bis 75% Zirconiumdioxid und aus 25% bis 50 % und insbesondere 25% bis 30% Aluminiumoxid. Diese Anteilsverhältnisse der beiden Schleifkornkomponenten hat sich als besonders geeignet erwiesen.Ideally, the grain mixture of the abrasive grain is from 50% to 75% and more preferably from 70% to 75% zirconia and from 25% to 50%, and more preferably from 25% to 30% alumina. These proportions of the two abrasive grain components has proven to be particularly suitable.

Weitere Variationsmöglichkeiten ergeben sich im Hinblick auf die verwendeten Korngrößen des Schleifkorns. Die erfindungsgemäß vorgesehene Kornmischung entfaltet dabei bei Korngrößen von 40, 50 oder 60, insbesondere 50, gemäß CAMI-Körnungsgrößenangabe (Coated Abrasive Manufacturing Institute) ihr volles Schleifpotential. Diese Körnungsgrößenangaben bezeichnen dabei mit 40 eine Kornmischung mit einem durchschnittlichen Partikeldurchmesser von 425 µm, mit 50 eine Kornmischung mit einem durchschnittlichen Partikeldurchmesser von 348 µm und mit 60 eine Kornmischung mit einem durchschnittlichen Partikeldurchmesser von 265 µm.Further variation possibilities arise with regard to the grain sizes of the abrasive grain used. The grain mixture provided according to the invention unfolds its full grinding potential at grain sizes of 40, 50 or 60, in particular 50, according to the CAMI grain size specification (Coated Abrasive Manufacturing Institute) . These grit size data denote a grain mixture having an average particle diameter of 425 .mu.m, 50 a grain mixture having an average particle diameter of 348 .mu.m and 60 a grain mixture having an average particle diameter of 265 .mu.m.

Eine Bestückung des Trägertellers mit 34 bis 40 Schleiflamellen ist im Hinblick auf die Gesamtleistungsfähigkeit einer erfindungsgemäßen Fächerschleifscheibe ebenfalls bevorzugt.An assembly of the carrier plate with 34 to 40 grinding lamellae is also preferred in view of the overall performance of a flapper disc according to the invention.

Optimale Anstellwinkel der einzelnen Schleiflamellen gegenüber der Außenoberfläche des Trägertellers liegen im Bereich zwischen 3 ° und 13 °, insbesondere im Bereich zwischen 9 ° bis 12 °. Diese vergleichsweise flachen Anstellwinkel der Flächenebene der Schleiflamelle gegenüber der Tragfläche des Trägertellers liefern optimale Nutzungsergebnisse des Schleifpotentials der Schleiflamellen einer Lamellenschleifscheibe. Idealerweise sind dabei alle Schleiflamellen einer Lamellenschleifscheibe mit demselben Anstellwinkel am Trägerteller angeordnet und im Vergleich zu den jeweils benachbarten Schleiflamellen jeweils um den gleichen Winkelbetrag relativ zur Rotationsachse der Lamellenschleifscheibe versetzt.Optimal angles of attack of the individual grinding lamellae with respect to the outer surface of the carrier plate are in the range between 3 ° and 13 °, in particular in the range between 9 ° and 12 °. These comparatively flat angles of incidence of the surface plane of the grinding lamella relative to the support surface of the carrier plate provide optimum utilization results of the grinding potential of the grinding lamellae of a lamellar grinding wheel. Ideally, all grinding lamellae of a lamellar grinding wheel are arranged with the same angle of attack on the carrier plate and in comparison to the each adjacent grinding blades each offset by the same angular amount relative to the axis of rotation of the disk grinding wheel.

Das Schleifgewebe umfasst üblicherweise ein Grundgewebe, auf das die Kornmischung aufgetragen wird. Das Grundgewebe dient somit als Tragmittel für die Kornmischung. Bevorzugt besteht das Grundgewebe aus Polyester oder aus einer Mischung aus Polyester und Baumwolle.The abrasive cloth usually comprises a base fabric to which the grain mixture is applied. The base fabric thus serves as a carrier for the grain mixture. The base fabric preferably consists of polyester or of a mixture of polyester and cotton.

Neben dem Grundgewebe und der Kornmischung kann das Schleifgewebe weitere Zusatzstoffe, beispielsweise zur Anbindung des Schleifkorns an das Grundgewebe und/oder zur Modifikation der Schleifeigenschaften der Fächerschleifscheibe, aufweisen. Hier hat es sich als vorteilhaft erwiesen, wenn das Schleifgewebe als Füllstoff Kalziumkarbonat (CaCO3) enthält. Ergänzend oder alternativ weist das Schleifgewebe idealerweise Phenolharz als Bindemittel auf.In addition to the base fabric and the grain mixture, the abrasive fabric may have further additives, for example for bonding the abrasive grain to the base fabric and / or for modifying the abrasive properties of the flap disc. Here it has proved to be advantageous if the abrasive fabric contains calcium carbonate (CaCO 3 ) as filler. Additionally or alternatively, the abrasive fabric ideally comprises phenolic resin as a binder.

Die Anteile der im Schleifgewebe vorhandenen Komponenten, beispielsweise des Grundgewebes, der Kornmischung, des oder der Füllstoffe und/oder Bindemittel, können in einem breiten Spektrum variieren. Es hat sich allerdings zum Erhalt optimaler Schleifergebnisse und langer Nutzungsintervalle als vorteilhaft erwiesen, wenn der Anteil der beiden Komponenten der Kornmischung in Bezug auf das Gesamtschleifgewebe in bestimmten Bereichen liegt. Idealerweise beträgt der Anteil der Kornmischung an sich 25% bis 70% an der Gesamtmasse des Schleifgewebes. Im Einzelnen liegt der Masseanteil Zirconiumdioxid am Schleifgewebe bei 20% bis 50 %, insbesondere bei 25% bis 35% und ganz besonders bei 30% bis 32%, und der Masseanteil Aluminiumoxid am Schleifgewebe bei 6% bis 20%, insbesondere bei 6% bis 15% und ganz besonders bei 7% bis 10%.The proportions of the components present in the abrasive fabric, for example the base fabric, the grain mixture, the filler (s) and / or binder, can vary within a wide range. However, it has proved to be advantageous for obtaining optimum grinding results and long service intervals when the proportion of the two components of the grain mixture with respect to the total abrasive fabric is in certain ranges. Ideally, the proportion of the grain mixture per se is 25% to 70% of the total weight of the abrasive cloth. Specifically, the zirconia mass fraction at the abrasive fabric is from 20% to 50%, more preferably from 25% to 35% and most preferably from 30% to 32%, and the weight percent alumina at the abrasive fabric is from 6% to 20%, more preferably 6% to 15% and especially at 7% to 10%.

Die erfindungsgemäßen Vorteile können grundsätzlich mit Fächerschleifscheiben mit einem Durchmesser im Bereich zwischen 110 mm und 130 mm erreicht werden. Besonders bewährt hat es sich allerdings, wenn der Durchmesser der Fächerschleifscheibe gemäß den vorstehenden Ausführungsformen vorzugsweise 115 mm oder 125 mm beträgt. Der Durchmesser der Fächerschleifscheibe ist dabei der Randabstand zweier auf dem Rand der Fächerschleifscheibe liegender Punkte, deren Verbindungsgerade durch die Rotationsachse der Fächerschleifscheibe verläuft.The advantages according to the invention can in principle be achieved with flap discs having a diameter in the range between 110 mm and 130 mm. However, it has proved particularly useful if the diameter of the flap disc according to the above embodiments is preferably 115 mm or 125 mm. The diameter of the flap disc is the edge distance between two points lying on the edge of the flap disc, whose connecting line runs through the axis of rotation of the flap disc.

Die einzelnen Schleiflamellen sind erfindungsgemäß zwischen 24 mm bis 30 mm breit. Vorzugsweise sind sie zwischen 24 mm bis 25 mm breit bei einem Scheibendurchmesser von 115 mm und vorzugsweise 27 mm bis 30 mm breit bei einem Scheibendurchmesser von 125 mm. Die einzelnen Schleiflamellen sind ferner ergänzend oder alternativ bevorzugt 19 mm bis 26 mm lang. Dabei werden für eine Lamellenschleifscheibe vorzugsweise Schleiflamellen mit gleichen Abmessungen verwendet.The individual grinding blades are according to the invention between 24 mm to 30 mm wide. Preferably, they are between 24 mm to 25 mm wide with a pulley diameter of 115 mm and preferably 27 mm to 30 mm wide with a pulley diameter of 125 mm. The individual grinding blades are also additionally or alternatively preferably 19 mm to 26 mm long. In this case, abrasive slats with the same dimensions are preferably used for a flap grinding wheel.

Nachfolgend wird die Erfindung anhand eines in den Figuren angegebenen Ausführungsbeispiels näher erläutert. Es zeigen schematisch

Fig. 1
eine Draufsicht auf die Vorderseite beziehungsweise Schleifseite einer Fächerschleifscheibe;
Fig. 2
eine Seitenschnittansicht entlang der Linie I-I aus Fig. 1; und
Fig. 3
eine einzelne Schleiflamelle in Draufsicht.
The invention will be explained in more detail with reference to an embodiment given in the figures. It show schematically
Fig. 1
a plan view of the front or grinding side of a flap disc;
Fig. 2
a side sectional view taken along the line II Fig. 1 ; and
Fig. 3
a single grinding lamella in plan view.

Wesentliche Elemente der Fächerschleifscheibe 1 sind ein kreisscheibenförmiger Trägerteller 2 mit einer Durchgangsöffnung 3 und auf die Schleifseite der Fächerschleifscheibe 1 auf der Außenseite des Trägertellers 2 angeordneten Schleiflamellen 4. Die einzelnen Schleiflamellen 4 sind rechteckig ausgebildet und einander überlappend fächerartig und kreisförmig die Durchgangsöffnung 3 umlaufend zum Außenrand des Trägertellers 2 mit dem Trägerteller 2, beispielsweise über Klebverbindungen, verbunden. Insgesamt hat die Fächerschleifscheibe einen Durchmesser D von 125 mm.Essential elements of the flap wheel 1 are a circular disc-shaped carrier plate 2 with a through hole 3 and on the grinding side of the flap wheel 1 on the outside of the carrier plate 2 arranged abrasive slats 4. The individual grinding blades 4 are rectangular and overlapping fan-like and circular, the through hole 3 circumferentially to the outer edge the carrier plate 2 with the carrier plate 2, for example via adhesive bonds, connected. Overall, the flap disc has a diameter D of 125 mm.

Die Fächerschleifscheibe 1 kann ferner Einbuchtungen zur Aufnahme einer Befestigungsmutter, insbesondere im Bereich der Durchgangsöffnung 3, Befestigungsmittel, wie beispielsweise ein Gewinde, oder weitere bei derartigen Fächerschleifscheiben im Stand der Technik zum Einsatz kommende und über den in Fig. 1 angegebenen Grundaufbau hinausgehende Merkmale aufweisen.The flapper disc 1 can also indentations for receiving a fastening nut, in particular in the region of the passage opening 3, fastening means, such as a thread, or more in such prior art flap discs used in the art and on the in Fig. 1 have stated basic structure beyond characteristics.

Weitere Details zum Aufbau der Fächerschleifscheibe ergeben sich ferner aus der Seitenschnittansicht gemäß Fig. 2. Fig. 2 ist eine Querschnittsansicht entlang der Linie I-I aus Fig. 1. Die einzelnen Schleiflamellen 4 bestehen aus einem Schleifgewebe 8, umfassend ein Grundgewebe 6 und auf das Grundgewebe 6 aufgetragenes Schleifkorn 7, das aus Übersichtlichkeitsgründen in Fig. 2 als Schicht dargestellt ist und konkret eine Vielzahl von Schleifkörnern umfasst, im vorliegenden Ausführungsbeispiel mit einer durchschnittlichen Partikelgröße von 348 µm (Korngröße 50 gemäß CAMI). Die Schleiflamellen 4 sind einander überlappend um den Mittelpunkt der Durchgangsöffnung 3 angeordnet. In Fig. 2 ist die Gesamtheit der Schleiflamellen 4 als Schleiflamellenschicht 4' dargestellt und beispielhaft die einzelne Schleiflamelle 4a aus Fig. 1 in dieser Schicht angegeben. Die flachen Schleiflamellen 4 sind dabei mit einem Anstellwinkel α schräg gegenüber der kreisförmigen Außenoberfläche beziehungsweise Tragoberfläche O des Trägertellers 2 angeordnet. Die Tragoberfläche O ist dabei eine im Wesentlichen quer zur Rotationsachse R der Fächerschleifscheibe 1 verlaufende Tragfläche am Trägerteller 2. Die insgesamt 36 Schleiflamellen 4 sind gleichförmig ausgebildet und jeweils in einem Winkelabstand von 10° zueinander gleichmäßig verteilt um die Rotationsachse R der Fächerschleifscheibe 1 angeordnet.Further details on the design of the flapper disk are also given in the side sectional view according to FIG Fig. 2. Fig. 2 is a cross-sectional view taken along the line II Fig. 1 , The individual abrasive lamellae 4 consist of an abrasive cloth 8, comprising a base fabric 6 and applied to the base fabric 6 abrasive grain 7, which for reasons of clarity in Fig. 2 is shown as a layer and concretely comprises a plurality of abrasive grains, in the present embodiment having an average particle size of 348 microns (grain size 50 according to CAMI). The grinding blades 4 are arranged overlapping each other around the center of the passage opening 3. In Fig. 2 For example, the entirety of the abrasive flaps 4 is shown as an abrasive flake layer 4 ', and the single abrasive flake 4 a is exemplified Fig. 1 indicated in this layer. The flat grinding blades 4 are inclined α with an angle of attack relative to the circular Outer surface or support surface O of the carrier plate 2 is arranged. The support surface O is a substantially transversely to the axis of rotation R of the flap wheel 1 extending support surface on the support plate 2. The total of 36 grinding blades 4 are uniformly formed and each uniformly distributed at an angular distance of 10 ° to each other around the axis of rotation R of the flap wheel 1.

Das Schleifgewebe 8 umfasst neben einer Kornmischung, bestehend aus einer Mischung aus Zirkoniumoxid und Aluminiumoxid, weitere Bestandteile, wie beispielsweise Kalziumkarbonat als Füllstoff und Phenolharz als Bindemittel. Im konkreten Ausführungsbeispiel besteht die Kornmischung des Schleifkorns aus 70% Zirkoniumoxid und 30% Aluminiumoxid, bezogen auf die Masseanteile der beiden Komponenten an der Gesamtmasse der Kornmischung. In Bezug auf die Gesamtmasse des Schleifgewebes 8 betragen die Massenanteile und Prozent m/m Zirkoniumdioxid 30% und Aluminiumoxid 13%. Die weiteren Massenanteile des Schleifgewebes 8 gehen unter anderem auf das aus Polyester bestehende Grundgewebe 6 und weitere im Schleifgewebe 8 enthaltene Bestandteile, wie beispielsweise den Füllstoff Kalziumkarbonat und das Bindemittel Phenolharz, zurück.The abrasive cloth 8 comprises, in addition to a grain mixture consisting of a mixture of zirconium oxide and aluminum oxide, further constituents, such as, for example, calcium carbonate as filler and phenolic resin as binder. In the specific embodiment, the grain mixture of the abrasive grain consists of 70% zirconium oxide and 30% aluminum oxide, based on the mass fractions of the two components in the total mass of the grain mixture. With respect to the total mass of the abrasive cloth 8, the mass fractions and percent m / m zirconia are 30% and alumina 13%. The further mass fractions of the abrasive cloth 8 are due, inter alia, to the existing polyester base fabric 6 and other ingredients contained in the abrasive fabric 8, such as the filler calcium carbonate and the binder phenolic resin back.

Eine einzelne Schleiflamelle 4 der Schleiflamellen aus den Figuren 1 und 2 ist ferner in Fig. 3 in Draufsicht angegeben. Diese einzelne Schleiflamelle 4 weist eine Breite B von 28 mm und eine Länge L von 20 mm auf.A single grinding blade 4 of the grinding blades from the Figures 1 and 2 is also in Fig. 3 indicated in plan view. This single grinding blade 4 has a width B of 28 mm and a length L of 20 mm.

Claims (9)

  1. An abrasive flap disc (1) having a carrier plate (2) and abrasive lamellae (4) which are arranged on the carrier plate (2) around a central opening (3) and are made of abrasive fabric (8) comprising a base fabric (6) and abrasive grain (7) applied to the base fabric (6), the diameter (D) of the abrasive flap disc (1) being in the range between 110 mm and 130 mm, and
    the abrasive lamellae (4) being designed as rectangular,
    characterized in that
    the abrasive lamellae (4) have a width (B) in the range between 24 mm and 30 mm, that the abrasive grain (7) is a grain mixture, which consists of 25% to 75% zirconium dioxide and of 25% to 75% aluminum oxide,
    and that the number of the abrasive lamellae (4) is between 30 and 46.
  2. The abrasive flap disc (1) according to claim 1,
    characterized in that
    the grain mixture of the abrasive grain (7) consists of 50% to 75% and in particular of 70% to 75% zirconium dioxide, and of 25% to 50% and in particular 25% to 30% aluminum oxide.
  3. The abrasive flap disc (1) according to any one of the preceding claims,
    characterized in that
    the number of the abrasive lamellae (4) is between 34 and 40.
  4. The abrasive flap disc (1) according to any one of the preceding claims,
    characterized in that
    the base fabric (6) consists of polyester or of a mixture of polyester and cotton.
  5. The abrasive flap disc (1) according to any one of the preceding claims,
    characterized in that
    the abrasive fabric (8) has calcium carbonate as a filler and/or phenolic resin as a binder.
  6. The abrasive flap disc (1) according to any one of the preceding claims,
    characterized in that
    the portion of abrasive fabric (8) is 20% to 50%, in particular 25% to 35%, and very particularly 30% to 32% zirconium dioxide and 6% to 20%, in particular 6% to 15%, and very particularly 7% to 10% aluminum oxide.
  7. The abrasive flap disc (1) according to any one of the preceding claims,
    characterized in that
    it (1) has a diameter (D) of 115 mm or 125 mm.
  8. The abrasive flap disc (1) according to any one of the preceding claims,
    characterized in that
    the abrasive lamellae (4) have a length (L) in the range between 19 mm and 26 mm.
  9. The abrasive flap disc (1) according to any one of the preceding claims,
    characterized in that
    the abrasive lamellae (4) are arranged at an angle (α) in the range between 3° to 13° and in particular between 9° to 12° with respect to the support surface (O) of the carrier plate (2).
EP13003275.8A 2012-09-18 2013-06-27 Flap grinding disc Active EP2708326B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012018435 2012-09-18
DE102012021267.4A DE102012021267B4 (en) 2012-09-18 2012-10-29 flap disc

Publications (4)

Publication Number Publication Date
EP2708326A2 EP2708326A2 (en) 2014-03-19
EP2708326A3 EP2708326A3 (en) 2014-07-23
EP2708326B1 true EP2708326B1 (en) 2015-09-02
EP2708326B8 EP2708326B8 (en) 2016-03-09

Family

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Family Applications (1)

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EP (1) EP2708326B8 (en)
ES (1) ES2553006T3 (en)

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BR112018003397B1 (en) * 2015-08-21 2021-06-01 August Rüggeberg Gmbh & Co. Kg WHEELING AND METHOD FOR MANUFACTURING IT
DE102015011442A1 (en) 2015-09-01 2017-03-02 Gerd Eisenblätter Gmbh Flap disc, carrier plate therefor and method for its production
JP7083848B2 (en) * 2017-02-22 2022-06-13 エーシーエス インダストリーズ、インク． Striped rotary floor release pad
US20220258305A1 (en) * 2021-02-17 2022-08-18 David Edens Double-Sided Flap Disc for Use with a Mounted Grinder

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Publication number Publication date
US20140080392A1 (en) 2014-03-20
US11667010B2 (en) 2023-06-06
EP2708326A3 (en) 2014-07-23
EP2708326B8 (en) 2016-03-09
ES2553006T3 (en) 2015-12-03
US20200180114A1 (en) 2020-06-11
EP2708326A2 (en) 2014-03-19

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