EP1893384A1 - Method and device for grinding ceramic spheres - Google Patents

Method and device for grinding ceramic spheres

Info

Publication number
EP1893384A1
EP1893384A1 EP06706173A EP06706173A EP1893384A1 EP 1893384 A1 EP1893384 A1 EP 1893384A1 EP 06706173 A EP06706173 A EP 06706173A EP 06706173 A EP06706173 A EP 06706173A EP 1893384 A1 EP1893384 A1 EP 1893384A1
Authority
EP
European Patent Office
Prior art keywords
grinding
abrasive grain
grinding wheel
diamond
balls
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
Application number
EP06706173A
Other languages
German (de)
French (fr)
Other versions
EP1893384B1 (en
Inventor
Michael Pötzsch
Walter Karb
Michael Haubert
Karl-Otto Stock
Marco Weber
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.)
Atlantic GmbH
Original Assignee
Atlantic GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Atlantic GmbH filed Critical Atlantic GmbH
Publication of EP1893384A1 publication Critical patent/EP1893384A1/en
Application granted granted Critical
Publication of EP1893384B1 publication Critical patent/EP1893384B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B11/00—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor
    • B24B11/02—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls
    • B24B11/04—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls involving grinding wheels
    • B24B11/06—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls involving grinding wheels acting by the front faces, e.g. of plane, grooved or bevelled shape

Definitions

  • the present invention relates to a method and an apparatus for grinding ceramic balls.
  • Ceramic balls in the context of this patent application balls of ceramic materials such as oxide ceramic, carbides, silicon nitride, precious and semi-precious stones, but also glass are to be understood.
  • the synthetic resin bond is a hot-pressed phenolic resin bond or polyimide bond, wherein preferably the pore volume is close to zero.
  • Abrasive wheels are subject in use a small deformation when attached as abrasive coating on a carrier plate, in particular are cemented. The wear is further reduced if a honing oil is added as cooling lubricant.
  • Another embodiment of the invention provides that two grinding wheels are used in the stone-to-stone process, wherein in particular the two grinding wheels are substantially identical.
  • Figure 2 a device for ball grinding in the stone-to-stone process with a vertical axis.
  • FIG. 2 shows a grinding machine similar to the one shown in FIG.
  • the fixed guide plate 1 is also provided with an abrasive coating Ia disposed opposite to the abrasive coating 3a of the rotary support plate 3.
  • the balls 2 to be ground are arranged between the two grinding wheels 1a and 3a.
  • a pressure P is exerted on the fixed guide disk 1 from the upper side.
  • the support plate 3 is rotated by a drive, so that the balls 2 roll in the Fuhrungsrillen.
  • the speed differences in the various regions of the guide grooves cause a relative movement of the abrasive coating to the surface of the ceramic ball.
  • the abrasive grain in the abrasive coating then leads to an abrasion of the surface of the ball and thus to an improvement in the surface quality and the spherical shape.
  • the inventive method can be carried out both on a Ku ⁇ gelschleifmaschine with vertical drive shaft and on a ball grinding machine with a horizontal drive shaft.
  • a honing oil is added as cooling lubricant which, on the one hand, rewinds the abrasive grain and the ceramic ball and which, on the other hand, also transports abrasive grains, binding particles and spherical abrasions that have broken out of the surface of the grinding wheels, so that the latter does not touch the ball surface attach and negatively affect the grinding process.
  • Diameter of 200 mm and a thickness of 4 mm used.
  • the grinding wheel was cemented onto a steel carrying plate.
  • the pressure plate was made of steel and had five circumferential grooves. Grinding was done without a magazine on a vertical axis grinder.
  • Zirconia (ZrO 2 ) spheres in a round shape with an initial dimension of 5, 96 mm to 6, 03 mm were machined. In a batch were about 140 bullets. The final measure was 5, 50 mm. The removal was 504 ⁇ m with a grinding time of 4 hours. The removal rate was thus about 125 ⁇ m per hour. The depth of the grooves in the grinding wheel after completion of the experiment was 0.5 mm.
  • Trial 2 Balls made of ZrO 2 in barrel form with a starting dimension of 5, 72 mm x 5, 25 mm were processed. In total, the batch comprised 300 blanks. The final dimension was 5, 15 mm. The mean removal was 570 ⁇ m with a grinding time of 3.75 hours. This corresponds to an average removal rate of 152 ⁇ m per hour. The groove depth in the grinding wheel after the end of the experiment was 0.94 mm.
  • Silicon nitride balls (Si 3 N 4 ) with an initial dimension of 5.34 mm were machined. There were 300 blanks in a batch. The gauge was 5.16 mm. The average
  • Ablation was 180 ⁇ m with a grinding time of 3.5 hours.
  • the average removal rate was 51 ⁇ m per hour.
  • the groove depth in the grinding wheel after completion of the test was 1.10 mm.
  • experiment 2 already started with a groove depth of 0.5 mm
  • experiment 3 already started with a groove depth of 0.94 mm.
  • the groove depth has therefore increased, for example in experiment 3 only by 0, 16 mm.
  • Silicon nitride balls (Si 3 N 4 ) with a starting diameter of 6, 12 mm were machined. In a total of 340 pieces were processed. The grinding time was 9 hours. The final diameter reached was 5.956 mm. This corresponds to a removal of up to 120 ⁇ m in 9 hours. The achieved surface roughness Ra is 0, 05 ⁇ m to 0, 06 ⁇ m.
  • the good removal rate and the low wear of the grinding wheel resp. of the abrasive pad cemented to the support plate are due to the resin bond of the abrasive grain.
  • this bond unlike electrolytic bonding in the prior art, a slight elastic movement of the abrasive grain in the bonding matrix is ensured. Due to this elasticity, the abrasive grain can escape at peak loads, as can occur due to the extremely hard ceramic balls, in the microscopic range. The service life of the grinding wheel increases considerably.
  • the removal rate is also improved because the balls form grooves during the grinding process in the grinding wheel. The depth of the grooves is relatively low. But it is larger than electrolytically bonded grinding wheels that can form virtually no grooves.
  • the novel method and the novel device for grinding ceramic balls not only allow high removal rates with good grinding results, but also a use of grinding machines that are the modern rational methods accessible. For example, the use of magazines for ball feeding is possible.
  • the use of coolants causes the technological controllability of the grinding processes and allows the connection of corresponding filter devices, which makes the process extremely eco-friendly.
  • the cleaning of the balls after grinding is particularly easy and can be carried out in conventional ball washing machines, since not forming the typical for the lobes adhesions of the grinding paste.

Abstract

The invention relates to an especially economical method for grinding ceramic spheres using a sphere grinder. The invention is characterized in that a grinding wheel with abrasive diamond grains that are bound in a synthetic resin is used.

Description

Verfahren und Vorrichtung zum Schleifen von keramischen KugelnMethod and device for grinding ceramic balls
Die vorliegende Erfindung betrifft ein Verfahren und eine Vor- richtung zum Schleifen von keramischen Kugeln .The present invention relates to a method and an apparatus for grinding ceramic balls.
Unter keramischen Kugeln sollen im Zusammenhang dieser Patentanmeldung Kugeln aus keramischen Materialien wie zum Beispiel Oxidkeramik, Carbiden, Siliziumnitrid, Edel- und Halbedelsteinen, aber auch Glas verstanden werden .Ceramic balls in the context of this patent application balls of ceramic materials such as oxide ceramic, carbides, silicon nitride, precious and semi-precious stones, but also glass are to be understood.
Das Schleifen von keramischen Kugeln zur Erzielung niedrigerThe grinding of ceramic balls to achieve lower
Oberflächenrauigkeiten und hoher Güteklassen wird derzeit allgemein mit Vorrichtungen durchgeführt, wie sie auch zur Bearbeitung von Metallkugeln verwendet werden . Dabei werden die Keramikkugeln im eigentlichen Sinne nicht geschliffen, sondern geläppt . Während bei der Bearbeitung von metallischen Kugeln zunächst das Grobschleifen und dann das Feinschleifen mit Schleifscheiben mit gebundenem Schleifkorn vorgesehen ist und eventuell danach das Läppen mit in Pastenform vorliegendem Schleifkorn praktiziert wird, werden keramische Kugeln nicht mit Schleifscheiben bearbeitet, sondern über den gesamten Abtragungsvorgang geläppt . Das Schleifkörn, das in der Schleifpaste vorhanden ist, ist dabei im allgemeinen Diamant .Surface roughness and high quality grades are currently generally performed with devices such as those used to machine metal balls. The ceramic balls are not ground in the true sense, but lapped. While in the machining of metallic balls, first coarse grinding and then fine grinding with grinding wheels with bonded abrasive grain is provided and possibly thereafter the lapping present in paste form Abrasive grain is practiced, ceramic balls are not machined with grinding wheels, but lapped over the entire removal process. The abrasive grain present in the abrasive paste is generally diamond.
Dieser Prozess ist technologisch außerordentlich schwierig durchzuführen, denn die Abtragsleistung liegt in der Größenordnung von maximal 100 μm pro Tag . Der zu realisierende Abtrag von 0 , 2 - 0 , 4 mm im Kugeldurchmesser entspricht der Dicke der inhomogenen Grenzschicht und wird z . T . erst in mehreren Tagen Bearbeitungszeit erreicht . Weiter sind nach dem Läppen die Keramikkugeln durch anhaftende Schleifpaste stark verschmutzt . Diese Schleifpaste ist bei den herkömmlichen Verfahren zum Waschen der Kugeln zum Teil nur sehr schwer entfernbar . Der Verschleiß der beiden Metallscheiben ist beim Läppen mit losem Diamantkorn extrem hoch . Schließlich bewirkt auch der sehr hohe Diamantverbrauch eine erhebliche Kostenbelastung des gesamten Verfahrens . In der Konsequenz hat sich die Verwendung von Keramikkugeln insbesondere im Bereich von Kugellagern deshalb nur dort durchgesetzt, wo die Kosten von unterge- ordneter Bedeutung sind .This process is technologically extremely difficult to perform because the removal rate is on the order of a maximum of 100 microns per day. The to be realized removal of 0, 2 - 0, 4 mm in the ball diameter corresponds to the thickness of the inhomogeneous boundary layer and z. T. processing time reached in several days. Further, after lapping, the ceramic balls are heavily soiled by adhering abrasive paste. This abrasive paste is very difficult to remove in the conventional method for washing the balls in part. The wear of the two metal discs is extremely high when lapping with loose diamond grain. Finally, the very high diamond consumption also causes a considerable cost burden for the entire process. As a result, the use of ceramic balls, especially in the area of ball bearings, has therefore only become established where the costs are of subordinate importance.
Einen Ansatz zur Verbesserung der Wirtschaftlichkeit findet man in der US-Patentschrift US 6, 171 , 179 Bl . Bei der dort vorgestellten Schleifmaschine ist eine Schleifscheibe mit elektrolytisch gebundenem Schleifkörn vorgesehen . Die feststehende Führungsscheibe weist eine Anzahl von Führungsringen auf, die j eweils einzeln hydraulisch belastet sind, um einen möglichst gleichmäßigen Eindruck der Keramikkugeln an die Schleifscheibe zu gewährleisten . In der Praxis hat sich diese Vorrichtung nicht durchgesetzt . Es wird vermutet, dass die Standzeit der Schleifscheibe zu gering ist .An approach to improving the economy can be found in the US Patent US 6, 171, 179 Bl. In the grinding machine presented there, a grinding wheel with electrolytically bonded abrasive grains is provided. The fixed guide disk has a number of guide rings, which are in each case hydraulically loaded individually in order to ensure the most uniform possible impression of the ceramic balls on the grinding wheel. In practice, this device has not prevailed. It is believed that the service life of the grinding wheel is too low.
Aus der j apanischen Patentanmeldung JP 05042467 A ist ein Verfahren zum Polieren von Siliziumnitridkugeln bekannt, bei dem Polierscheiben mit einem Schleifkorn von 5 - 60 Volumenprozent Cr2O3 mit einem mittleren Teilchendurchmesser von 0 , 01 - 3 μm eingesetzt werden . Die Bearbeitung der Kugeln hinsichtlich der Abtragsgeschwindigkeit der Oberfläche ist sehr gering . In einem Versuch wurde ein Abtrag von 60 μm in 50 Stunden erzielt, also etwa 1 μm pro Stunde . Die Oberflächenrauhigkeit, die bei einem zweiten Versuch erzielt wurde, liegt bei Ra = 0 , 005 μm. Dieses Verfahren, bei dem auch vorgeschlagen wird, einen Teil des Cr2O3 durch Diamant zu ersetzen, ist zur Erzielung hoher Oberflächengüten geeignet, die Abtragsleistung ist aber zum Schleifen von Keramikkugeln nach wie vor unbefriedigend .Japanese Patent Application JP 05042467 A discloses a method for polishing silicon nitride spheres, in which polishing wheels having an abrasive grain of 5-60% by volume Cr 2 O 3 with an average particle diameter of 0. 01-3 μm be used. The processing of the balls with regard to the removal rate of the surface is very low. In one experiment, a removal of 60 microns in 50 hours was achieved, ie about 1 micron per hour. The surface roughness obtained in a second experiment is Ra = 0.005 μm. This method, in which it is also proposed to replace a part of the Cr 2 O 3 by diamond, is suitable for achieving high surface qualities, but the removal rate is still unsatisfactory for grinding ceramic balls.
Es ist deshalb Aufgabe der vorliegenden Erfindung, ein Verfahren und eine Vorrichtung zum Schleifen von keramischen Kugeln zu schaffen, die eine wirtschaftlichere Fertigung von keramischen Kugeln mit der erforderlichen Güte und einer geringen Streuung im Kugeldurchmesser erlaubt .It is therefore an object of the present invention to provide a method and an apparatus for grinding ceramic balls, which allows a more economical production of ceramic balls with the required quality and a low dispersion in the ball diameter.
Diese Aufgabe wird von einem Verfahren mit den Merkmalen des Anspruchs 1 und von einer Vorrichtung mit den Merkmalen des Anspruchs 9 gelöst .This object is achieved by a method having the features of claim 1 and by a device having the features of claim 9.
Weil das Schleifen mit einer Schleifscheibe mit Schleifkorn in Kunstharzbindung erfolgt, bei der das Schleifkorn zu mehr als 50 % aus Diamant besteht und zu weniger als 5 % aus μm Cr2O3, können hohe Abtragsleistungen bei geringem Verschleiß der Schleifscheibe oder des Schleifbelages erreicht werden . Vorteilhaft ist es , wenn das Schleifkorn frei von Cr2O3 ist und insbesondere wenn das Schleifkörn aus reinem Diamant besteht . Dabei wird gegenüber dem nächstkommenden Stand der Technik eine nahezu zehnfache Abtragsleistung erreicht, während die mittlere Oberflächenrauhigkeit um einen Faktor 10 größer ist als im Stand der Technik. Der Anteil an Diamant im Schleifkorn liegt also bei mehr als 50% , insbesondere bei mehr als 90% und besonders bevorzugt ist ein Schleifkörn aus 100% Diamant .Because grinding is done with a synthetic resin bonded abrasive wheel, where the abrasive grain consists of more than 50% diamond and less than 5% of Cr 2 O 3 , high removal rates can be achieved with little wear on the grinding wheel or abrasive pad , It is advantageous if the abrasive grain is free of Cr 2 O 3 and in particular if the abrasive grain consists of pure diamond. In this case, a nearly tenfold removal rate is achieved compared with the closest prior art, while the average surface roughness is greater by a factor of 10 than in the prior art. The proportion of diamond in the abrasive grain is therefore more than 50%, in particular more than 90% and particularly preferred is an abrasive grain of 100% diamond.
Vorteilhaft ist die Kunstharzbindung eine heiß gepresste Phenolharzbindung oder Polyimidbindung, wobei vorzugsweise das Porenvolumen nahe Null ist . Die Schleifscheibe weist vorzugsweise eine Körnung von D181 (nach FEPA-Standard, mittlerer Teilchendurchmesser = 181 μm) bis D2 (mittlerer Teilchendurchmesser = 2 μm) auf, wobei für das Grobschleifen Körnungen von D181 bis D25 zum Einsatz kom- raen und für das Feinschleifen Körnungen von D15 bis D2 bevorzugt werden .Advantageously, the synthetic resin bond is a hot-pressed phenolic resin bond or polyimide bond, wherein preferably the pore volume is close to zero. The grinding wheel preferably has a grain size of D181 (according to FEPA standard, mean particle diameter = 181 μm) to D2 (mean particle diameter = 2 μm), grits of D181 to D25 being used for rough grinding and grains for fine grinding from D15 to D2 are preferred.
Schleifscheiben unterliegen im Einsatz einer geringen Verformung, wenn sie als Schleifbelag auf einem Trageteller befestigt, insbesondere aufgekittet sind. Der Verschleiß wird wei- ter verringert, wenn als Kühlschmierstoff ein Honöl zugegeben wird.Abrasive wheels are subject in use a small deformation when attached as abrasive coating on a carrier plate, in particular are cemented. The wear is further reduced if a honing oil is added as cooling lubricant.
Eine andere Ausführungsform der Erfindung sieht vor, dass zwei Schleifscheiben im Stone-to-Stone-Verfahren verwendet werden, wobei insbesondere die beiden Schleifscheiben im wesentlichen baugleich sind .Another embodiment of the invention provides that two grinding wheels are used in the stone-to-stone process, wherein in particular the two grinding wheels are substantially identical.
Weil bei einer erfindungsgemäßen Vorrichtung zum Schleifen von keramischen Kugeln mit einer Schleifscheibe mit gebundenem Diamantschleifkorn vorgesehen ist , dass die Schleifscheibe eine Kunstharzbindung, insbesondere eine heiß gepresste Phenolharz- bindung aufweist , ist das oben beschriebene Verfahren möglich . Dabei kann die Schleifscheibe auf einen Trageteller aufgekittet sein, so dass die mechanische Stabilität unter dem Verfahrensdruck gefördert und der Materialaufwand zur Herstellung der Scheibe minimiert wird .Since it is provided in a device according to the invention for grinding ceramic balls with a grinding wheel with bonded diamond abrasive grain that the grinding wheel has a synthetic resin bond, in particular a hot-pressed phenolic resin bond, the method described above is possible. In this case, the grinding wheel can be cemented onto a carrier plate, so that the mechanical stability is promoted under the process pressure and the material expenditure for producing the disk is minimized.
Ξrfindungsgemäß ist auch die Verwendung einer Schleifscheibe mit Diamantschleifkorn in Kunstharzbindung zum Schleifen von keramischen Kugeln, insbesondere in einer konventionellen Kugelschleifmaschine , wie sie zum Schleifen metallischer Kugeln bekannt ist .According to the invention, the use of a grinding wheel with diamond abrasive grain in synthetic resin bond for grinding ceramic balls, in particular in a conventional ball grinding machine, as it is known for grinding metallic balls.
Nachfolgend wird die vorliegende Erfindung anhand der Zeichnung sowie anhand von drei Beispielen beschrieben . Es zeigen : Figur 1 : eine Vorrichtung zum Kugelschleifen mit einerHereinafter, the present invention will be described with reference to the drawings and three examples. Show it : Figure 1: a device for ball grinding with a
Schleifscheibe und vertikaler Antriebsachse ; undGrinding wheel and vertical drive axle; and
Figur 2 : eine Vorrichtung zum Kugelschleifen im Stone-to- Stone-Verfahren mit vertikaler Achse .Figure 2: a device for ball grinding in the stone-to-stone process with a vertical axis.
In der Figur 1 ist das Prinzip des Kugelschleifens auf Maschinen mit vertikaler Antriebsachse veranschaulicht . Die Figur 1 zeigt in einer schematischen Darstellung die Vorrichtung zum Kugelschleifen in einer Draufsicht und in einer Seitenansicht . Dabei ist eine feststehende Fuhrungsscheibe 1 vorzugsweise aus Stahlguss vorgesehen . Die Fuhrungsscheibe 1 weist an ihrer Unterseite umlaufende Fuhrungsrillen auf, in denen eine Vielzahl von zu schleifenden Kugeln 2 gefuhrt werden . Von der Unterseite her ist ein Trageteller 3 mit einem darauf angeordneten Schleifbelag 3a vorgesehen, der durch eine Antriebswelle in Rotation zu versetzen ist . Ein Kugelein- und -austritt 4 ist zum Laden und Entladen der Vorrichtung vorgesehen .FIG. 1 illustrates the principle of ball grinding on machines with a vertical drive axle. FIG. 1 shows a schematic representation of the apparatus for ball grinding in a plan view and in a side view. In this case, a fixed Fuhrungsscheibe 1 is preferably provided from cast steel. The Fuhrungsscheibe 1 has on its underside circumferential Fuhrungsrillen in which a plurality of balls to be ground 2 are guided. From the underside, a carrier plate 3 is provided with an abrasive coating 3a arranged thereon, which is to be rotated by a drive shaft. A ball inlet and outlet 4 is provided for loading and unloading the device.
Die Figur 2 zeigt eine Schleifmaschine ahnlich derj enigen, die in der Figur 1 dargestellt wurde . Bei dieser Schleifmaschine ist die feststehende Fuhrungsplatte 1 ebenfalls mit einem Schleifbelag Ia versehen, der dem Schleifbelag 3a der rotierenden Trageplatte 3 gegenüber angeordnet ist . Die zu schleifenden Kugeln 2 sind zwischen den beiden Schleifscheiben Ia und 3a angeordnet .FIG. 2 shows a grinding machine similar to the one shown in FIG. In this grinding machine, the fixed guide plate 1 is also provided with an abrasive coating Ia disposed opposite to the abrasive coating 3a of the rotary support plate 3. The balls 2 to be ground are arranged between the two grinding wheels 1a and 3a.
Zum Schleifen wird in beiden Ausfuhrungsformen von der Ober- seite her ein Druck P auf die feststehende Fuhrungsscheibe 1 ausgeübt . Die Trageplatte 3 wird durch einen Antrieb in Rotation versetzt, so dass die Kugeln 2 sich in den Fuhrungsrillen abwälzen . Die Geschwindigkeitsunterschiede in den verschiedenen Bereichen der Fuhrungsrillen bewirken eine Relativbewegung des Schleifbelags zu der Oberflache der Keramikkugel . Das in dem Schleifbelag befindliche Schleifkorn fuhrt dann zu einer Abrasion der Oberflache der Kugel und damit zu einer Verbesserung der Oberflachenqualitat und der Kugelform. Das erfindungsgemaße Verfahren kann dabei sowohl auf einer Ku¬ gelschleifmaschine mit vertikaler Antriebswelle als auch auf einer Kugelschleifmaschine mit horizontaler Antriebswelle ausgeführt werden .For grinding, in both embodiments, a pressure P is exerted on the fixed guide disk 1 from the upper side. The support plate 3 is rotated by a drive, so that the balls 2 roll in the Fuhrungsrillen. The speed differences in the various regions of the guide grooves cause a relative movement of the abrasive coating to the surface of the ceramic ball. The abrasive grain in the abrasive coating then leads to an abrasion of the surface of the ball and thus to an improvement in the surface quality and the spherical shape. The inventive method can be carried out both on a Ku ¬ gelschleifmaschine with vertical drive shaft and on a ball grinding machine with a horizontal drive shaft.
Wahrend des Schleifvorgangs wird als Kuhlschmierstoff ein Hon- ol zugegeben, welches zum einen das Schleifkorn und die keramische Kugel umspult und welches zum anderen auch aus der O- berflache der Schleifscheiben ausgebrochene Schleifkorner, Bindungspartikel und Kugelabschliff weg transportiert, so dass letztere nicht an der Kugeloberflache anhaften und den Schleifprozess negativ beeinflussen können .During the grinding process, a honing oil is added as cooling lubricant which, on the one hand, rewinds the abrasive grain and the ceramic ball and which, on the other hand, also transports abrasive grains, binding particles and spherical abrasions that have broken out of the surface of the grinding wheels, so that the latter does not touch the ball surface attach and negatively affect the grinding process.
Die mit dem erfindungsgemaßen Verfahren erzielten Ergebnisse sollen nachfolgend anhand von drei Versuchsbeispielen beschrieben werden .The results achieved by the method according to the invention will be described below with reference to three experimental examples.
Bei den Versuchen 1-3 wurde eine Schleifscheibe mit einemIn experiments 1-3 was a grinding wheel with a
Durchmesser von 200 mm und einer Dicke von 4 mm verwendet . Die Schleifscheibe wurde aufgekittet auf einen Trageteller aus Stahl . Als Kuhlschmierstoff wurde das Hohnol EMOL®-O-HON 920 NV des Herstellers ML Lubrication GmbH zugegeben . Die Druck- platte bestand aus Stahl und wies fünf umlaufende Rillen auf . Das Schleifen erfolgte ohne Magazin auf einer Schleifmaschine mit vertikaler Achse .Diameter of 200 mm and a thickness of 4 mm used. The grinding wheel was cemented onto a steel carrying plate. As a cooling lubricant that Hohnol EMOL ® -O-HON 920 NV the manufacturer ML Lubrication GmbH added. The pressure plate was made of steel and had five circumferential grooves. Grinding was done without a magazine on a vertical axis grinder.
Versuch 1 :Trial 1:
Kugeln aus Zirkonoxid ( ZrO2) in runder Form mit einem Aus- gangsmaß von 5, 96 mm bis 6, 03 mm wurden bearbeitet . In einer Charge befanden sich etwa 140 Kugeln . Das erzielte Endmaß betrug 5, 50 mm. Der Abtrag betrug 504 μm bei einer Schleifzeit von 4 Stunden . Die Abtragsleistung betrug folglich etwa 125 μm pro Stunde . Die Tiefe der Rillen in der Schleifscheibe nach Beendigung des Versuchs betrug 0 , 5 mm.Zirconia (ZrO 2 ) spheres in a round shape with an initial dimension of 5, 96 mm to 6, 03 mm were machined. In a batch were about 140 bullets. The final measure was 5, 50 mm. The removal was 504 μm with a grinding time of 4 hours. The removal rate was thus about 125 μm per hour. The depth of the grooves in the grinding wheel after completion of the experiment was 0.5 mm.
Versuch 2 : Kugeln aus ZrO2 in Tonnenform mit einem Ausgangsmaß von 5, 72 mm x 5 , 25 mm wurden bearbeitet . Insgesamt umfasste die Charge 300 Rohlinge . Das Endmaß betrug 5, 15 mm. Der mittlere Abtrag betrug 570 μm bei einer Schleifzeit von 3 , 75 Stunden . Dies entspricht einer durchschnittlichen Abtragsleistung von 152 μm pro Stunde . Die Rillentiefe in der Schleifscheibe nach Beendigung des Versuchs betrug 0 , 94 mm.Trial 2: Balls made of ZrO 2 in barrel form with a starting dimension of 5, 72 mm x 5, 25 mm were processed. In total, the batch comprised 300 blanks. The final dimension was 5, 15 mm. The mean removal was 570 μm with a grinding time of 3.75 hours. This corresponds to an average removal rate of 152 μm per hour. The groove depth in the grinding wheel after the end of the experiment was 0.94 mm.
Versuch 3 :Trial 3:
Kugeln aus Siliziumnitrid (Si3N4 ) mit einem Ausgangsmaß von 5, 34 mm wurden bearbeitet . Es befanden sich 300 Rohlinge in einer Charge . Das Endmaß betrug 5 , 16 mm. Der durchschnittlicheSilicon nitride balls (Si 3 N 4 ) with an initial dimension of 5.34 mm were machined. There were 300 blanks in a batch. The gauge was 5.16 mm. The average
Abtrag betrug 180 μm bei einer Schleifzeit von 3 , 5 Stunden .Ablation was 180 μm with a grinding time of 3.5 hours.
Die durchschnittliche Abtragsleistung betrug 51 μm pro Stunde .The average removal rate was 51 μm per hour.
Die Rillentiefe in der Schleifscheibe nach Beendigung des Ver- suchs betrug 1, 10 mm.The groove depth in the grinding wheel after completion of the test was 1.10 mm.
Die angegebenen Rillentiefen sind auf die gleiche Schleifscheibe bezogen, da die gleiche Scheibe bei allen drei Versuchen nacheinander verwendet wurde . Der Versuch 2 begann folglich bereits mit einer Rillentiefe von 0 , 5 mm, wahrend der Versuch 3 bereits mit einer Rillentiefe von 0 , 94 mm begann . Die Rillentiefe hat sich deshalb beispielsweise im Versuch 3 nur um 0 , 16 mm vergrößert .The indicated groove depths are based on the same grinding wheel, since the same disk was used successively in all three experiments. Thus, experiment 2 already started with a groove depth of 0.5 mm, while experiment 3 already started with a groove depth of 0.94 mm. The groove depth has therefore increased, for example in experiment 3 only by 0, 16 mm.
Versuch 4 :Trial 4:
Kugeln aus Siliziumnitrit (Si3N4) mit einem Ausgangsdurchmes- ser von 6, 12 mm wurden bearbeitet . Es wurden in einem Versuch insgesamt 340 Stück bearbeitet . Die Schleifzeit betrug 9 Stunden . Der erreichte Enddurchmesser betrug 5, 956 mm. Dies entspricht einem Abtrag von bis zu 120 μm in 9 Stunden . Die erzielte Oberflachenrauheit Ra liegt bei 0 , 05 μm bis 0 , 06 μm.Silicon nitride balls (Si 3 N 4 ) with a starting diameter of 6, 12 mm were machined. In a total of 340 pieces were processed. The grinding time was 9 hours. The final diameter reached was 5.956 mm. This corresponds to a removal of up to 120 μm in 9 hours. The achieved surface roughness Ra is 0, 05 μm to 0, 06 μm.
Die Versuche zeigen, dass auch bei geringer Rillentiefe bereits eine gute Abtragsleistung erzielt wird . Normalerweise beginnt der Abtrag beim Kugelschleifen erst bei Rillentiefen von etwa 20 % des Kugeldurchmessers . Üblicherweise ist auch bei geringen Rillentiefen wie bei den vorliegenden drei Versuchen die Kugelgeometrie relativ schlecht . Die Ergebnisse der drei Versuche zeigen aber, dass bereits bei der sehr geringen Tiefe der Rillen in der Schleifscheibe ein sehr hoher Abtrag, eine gute Rundheit und eine ausgezeichnete Durchmesserstreuung erzielt werden konnte . Der Verschleiß der Schleifscheibe ist im Vergleich mit den hohen Abtragswerten sehr gering . Bemerkenswert ist, dass sich die länglichen, tonnenförmigen Rohlin- ge im Versuch 2 ebenso gut bearbeiten ließen wie runde Kugelrohlinge .The tests show that even at low groove depth a good removal rate is already achieved. Normally, the removal of the ball grinding begins only at groove depths about 20% of the ball diameter. Usually, even at low groove depths as in the present three experiments, the ball geometry is relatively poor. However, the results of the three tests show that even with the very small depth of the grooves in the grinding wheel, a very high removal, a good roundness and an excellent diameter spread could be achieved. The wear of the grinding wheel is very low in comparison with the high removal rates. It is noteworthy that the elongated, barrel-shaped blanks in Experiment 2 worked just as well as round ball blanks.
Die gute Abtragsleistung und der geringe Verschleiß der Schleifscheibe bzw . des auf die Trageplatte aufgekitteten Schleifbelags sind auf die Kunstharzbindung des Schleifkorns zurückzuführen . Bei dieser Bindung wird im Gegensatz zu der elektrolytischen Bindung im Stand der Technik eine geringfügige elastische Bewegung des Schleifkorns in der Bindungsmatrix gewährleistet . Durch diese Elastizität kann das Schleifkörn bei Spitzenbelastungen, wie sie durch die ausgesprochen harten keramischen Kugeln auftreten können, im mikroskopischen Bereich ausweichen . Die Standzeit der Schleifscheibe erhöht sich dadurch erheblich . Die Abtragsleistung wird ebenfalls verbessert, weil die Kugeln während des Schleifvorgangs in der Schleifscheibe Rillen ausbilden . Die Tiefe der Rillen ist re- lativ gering . Sie ist aber größer als bei elektrolytisch gebundenen Schleifscheiben, die praktisch keine Rillen ausbilden können .The good removal rate and the low wear of the grinding wheel resp. of the abrasive pad cemented to the support plate are due to the resin bond of the abrasive grain. In this bond, unlike electrolytic bonding in the prior art, a slight elastic movement of the abrasive grain in the bonding matrix is ensured. Due to this elasticity, the abrasive grain can escape at peak loads, as can occur due to the extremely hard ceramic balls, in the microscopic range. The service life of the grinding wheel increases considerably. The removal rate is also improved because the balls form grooves during the grinding process in the grinding wheel. The depth of the grooves is relatively low. But it is larger than electrolytically bonded grinding wheels that can form virtually no grooves.
Schließlich ist bei elektrolytisch gebundenem Diamantschleifkorn auf einer metallischen Trägerplatte zu erwarten, dass ei- ne Beschädigung der Bindung zu einem Ausbrechen ganzer Bereiche der Bindung und damit zum Ausfall der Schleifscheibe führt, was bei einer Schleifscheibe in Kunstharzbindung, bedingt durch ihren Selbstschärfmechanismus , nicht der Fall ist . Im Ergebnis waren die geschliffenen Kugeln von der Rundheit und der Durchmesserstreuung her gut . Die Abtragsleistung liegt um mindestens eine Größenordnung über den Abtragsleistungen bei bekannten Verfahren . Die Oberflachenrauhigkeit wurde nur in einem Fall untersucht . Hier kann vorgesehen sein, dass nach dem Grob- und Feinschleifen noch ein Lappen vorzusehen ist .Finally, with electrolytically bonded diamond abrasive grain on a metallic carrier plate, it is to be expected that damage to the bond will result in breakage of entire regions of the bond and hence failure of the abrasive wheel, which is not the case for a resin bonded grinding wheel due to its self-sharpening mechanism is. As a result, the ground balls were good in roundness and diameter dispersion. The removal rate is at least one order of magnitude above the removal rates in known methods. The surface roughness was examined only in one case. Here it can be provided that after the coarse and fine grinding nor a cloth is provided.
Das neuartige Verfahren und die neuartige Vorrichtung zum Schleifen von keramischen Kugeln ermöglichen nicht nur hohe Abtragsleistungen bei guten Schleifergebnissen, sondern auch eine Verwendung von Schleifmaschinen, die den modernen rationellen Methoden zuganglich sind . So ist zum Beispiel die Verwendung von Magazinen für die Kugelzufuhrung möglich . Der Einsatz von Kuhlschmierstoffen bewirkt die technologische Be- herrschbarkeit der Schleifprozesse und erlaubt das Zuschalten entsprechender Filtereinrichtungen, wodurch das Verfahren äußerst umweltfreundlich gestaltet werden kann . Auch die Reinigung der Kugeln nach dem Schleifen ist besonders einfach und kann in konventionellen Kugelwaschmaschinen durchgeführt werden, da sich nicht die für das Lappen typischen Anhaftungen der Schleifpaste ausbilden . The novel method and the novel device for grinding ceramic balls not only allow high removal rates with good grinding results, but also a use of grinding machines that are the modern rational methods accessible. For example, the use of magazines for ball feeding is possible. The use of coolants causes the technological controllability of the grinding processes and allows the connection of corresponding filter devices, which makes the process extremely eco-friendly. Also, the cleaning of the balls after grinding is particularly easy and can be carried out in conventional ball washing machines, since not forming the typical for the lobes adhesions of the grinding paste.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Verfahren zum Schleifen von Kugeln aus keramischen Mate- rialien wie zum Beispiel Oxidkeramik, Carbiden, Siliziumnitrid, Edel- und Halbedelsteinen und/oder Glas in einer Kugelschleifmaschine , d a d u r c h g e k e n n z e i c h n e t , dass das Schleifen mit einer Schleifscheibe ( 3a) mit Schleifkorn in Kunstharzbindung erfolgt , wobei das Schleifkorn zu mehr als 50 % aus Diamant und zu weniger als 5 % aus Cr2O3 besteht .1. A method for grinding balls of ceramic materials such as oxide ceramics, carbides, silicon nitride, precious and semi-precious stones and / or glass in a ball grinding machine, characterized in that the grinding is carried out with a grinding wheel (3a) with abrasive grain in synthetic resin bond, wherein the abrasive grain consists of more than 50% diamond and less than 5% Cr 2 O 3 .
2. Verfahren nach Anspruch 1 , d a d u r c h g e k e n n z e i c h n e t , dass das Schleifkorn zu mehr als 90% aus Diamant besteht .2. The method of claim 1, wherein a more than 90% of the abrasive grain is diamond.
3. Verfahren nach einem der vorhergehenden Ansprüche , d a d u r c h g e k e n n z e i c h n e t , dass das Schleifkorn zu 100% aus Diamant besteht .3. Method according to one of the preceding claims, characterized in that the abrasive grain consists of 100% of diamond.
4. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Kunst- harzbindung eine heiß gepresste Phenolharz- bzw . Polyi- midbindung ist .4. Method according to one of the preceding claims, characterized in that the synthetic resin bond is a hot-pressed Phenolharz- or. Polyimide bond is.
5. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass als Führungsscheibe (1 ) eine Stahl- bzw. Gussscheibe verwendet wird . 5. The method according to any one of the preceding claims, characterized in that a steel or cast disc is used as a guide disc (1).
6. Verfahren nach einem der vorhergehenden Ansprüche , d a d u r c h g e k e n n z e i c h n e t , dass die Schlei fscheibe ( 3a) eine Körnung von D181 bis D2 aufweist .6. Method according to one of the preceding claims, characterized in that the grinding disk (3a) has a grain size of D181 to D2.
7. Verfahren nach einem der vorhergehenden Ansprüche, d a - d u r c h g e k e n n z e i c h n e t , dass die Schleifscheibe ( 3a) auf einem Trageteller ( 3 ) befestigt ist .7. Method according to one of the preceding claims, characterized in that the grinding wheel (3a) is fastened on a carrier plate (3).
8. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass als Kühlschmierstoff ein Honöl bzw . eine Schleifemulsion zugege- ben wird.8. Method according to one of the preceding claims, characterized in that a cooling oil or a honing oil is used as the cooling lubricant. a grinding emulsion is added.
9. Verfahren nach einem der vorhergehenden Ansprüche , d a d u r c h g e k e n n z e i c h n e t , dass zwei Schleifscheiben ( 3a, Ia ) im Stone-to-Stone-Verfahren verwendet werden .9. Method according to one of the preceding claims, characterized in that two grinding wheels (3a, la) are used in the stone-to-stone process.
10. Verfahren nach Anspruch 9 , d a d u r c h g e k e n n z e i c h n e t , dass die beiden Schleifscheiben ( 3a , Ia ) im wesentlichen baugleich sind .10. The method according to claim 9, characterized in that the two grinding wheels (3a, la) are substantially identical in construction.
11. Vorrichtung zum Schleifen von Kugeln aus keramischen Materialien wie zum Beispiel Oxidkeramik, Carbiden, Sili zi- umnitrid, Edel- und Halbedelsteinen und/oder Glas mit einer Schleifscheibe mit gebundenem Diamantschleifkörn, d a d u r c h g e k e n n z e i c h n e t , dass die Schleifscheibe ( 3a ) eine Kunstharzbindung, insbesondere eine heiß gepresste Phenolharzbindung aufweist .11. An apparatus for grinding balls of ceramic materials such as oxide ceramics, carbides, silicon nitride, precious and semi-precious stones and / or glass with a grinding wheel with bonded diamond abrasive grain, characterized in that the grinding wheel (3a) a synthetic resin bond, in particular a having hot-pressed phenolic resin bond.
12. Vorrichtung nach Anspruch 11 , d a d u r c h g e k e n n z e i c h n e t , dass die Schleifscheibe ( 3a ) auf einem Trageteller ( 3 ) befestigt ist .12. The device according to claim 11, characterized in that the grinding wheel (3a) is fastened on a carrier plate (3).
13. Verwendung einer Schleifscheibe ( 3a ) mit Diamantschleifkorn in Kunstharzbindung zum Schleifen von Kugeln aus ke- ramischen Materialien wie zum Beispiel Oxidkeramik, Carbiden, Siliziumnitrid, Edel- und Halbedelsteinen und/oder Glas . 13. Use of a grinding wheel (3a) with diamond abrasive grain in synthetic resin bond for grinding balls of ceramic materials such as oxide ceramics, carbides, silicon nitride, precious and semi-precious stones and / or glass.
EP06706173.9A 2005-01-27 2006-01-06 Method and device for grinding ceramic spheres Active EP1893384B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005004038A DE102005004038A1 (en) 2005-01-27 2005-01-27 Method for grinding spheres of ceramic material uses grinding disc with diamond grinding grains embedded in plastics resin binding
PCT/EP2006/000075 WO2006079444A1 (en) 2005-01-27 2006-01-06 Method and device for grinding ceramic spheres

Publications (2)

Publication Number Publication Date
EP1893384A1 true EP1893384A1 (en) 2008-03-05
EP1893384B1 EP1893384B1 (en) 2016-03-23

Family

ID=36286206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06706173.9A Active EP1893384B1 (en) 2005-01-27 2006-01-06 Method and device for grinding ceramic spheres

Country Status (10)

Country Link
US (1) US7722440B2 (en)
EP (1) EP1893384B1 (en)
JP (1) JP5294637B2 (en)
KR (1) KR20070100904A (en)
CN (1) CN101107096A (en)
BR (1) BRPI0607081A2 (en)
DE (1) DE102005004038A1 (en)
PL (1) PL1893384T3 (en)
RU (1) RU2396160C2 (en)
WO (1) WO2006079444A1 (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005004038A1 (en) * 2005-01-27 2006-08-03 Guilleaume-Werk Gmbh Method for grinding spheres of ceramic material uses grinding disc with diamond grinding grains embedded in plastics resin binding
CN100427267C (en) * 2007-03-12 2008-10-22 楼志强 Crystal-glass ball-grinding side machining apparatus
CN100467223C (en) * 2007-09-21 2009-03-11 浙江工业大学 Sphericity part fixed abrasive lapping method
JP5334040B2 (en) * 2008-10-03 2013-11-06 Ｎｔｎ株式会社 Spherical body polishing apparatus, spherical body polishing method, and spherical member manufacturing method
CN101486145B (en) * 2009-01-16 2011-08-17 北京中材人工晶体有限公司 Method for processing ceramic bearing ball
CN101554707B (en) * 2009-04-16 2012-03-21 武汉金凰珠宝股份有限公司 Automatic sand nailing device
CN101602181B (en) * 2009-07-13 2011-05-18 包德宏 Process and grinding plate for processing low-noise precise steel ball
WO2011040296A1 (en) 2009-09-29 2011-04-07 Ntn株式会社 Method for grinding green ball, method for manufacturing ceramic ball, and grinding device
DE102010020601B4 (en) * 2010-05-14 2013-01-24 Saint-Gobain Diamantwerkzeuge Gmbh & Co. Kg grinding wheel
RU2434083C1 (en) * 2010-10-28 2011-11-20 Общество С Ограниченной Ответственностью "Гранник" Procedure for simultaneous production of several faceted valuable stones of synthetic silicon carbide - moissanite
CN102240946A (en) * 2011-06-15 2011-11-16 大连大友高技术陶瓷有限公司 Ball grinder
CN102513897A (en) * 2011-11-25 2012-06-27 成都科力铁硬质合金有限公司 Device for grinding and machining hard alloy ball by using vertical surface-grinding machine
CN102729139B (en) * 2012-07-10 2015-08-12 江苏力星通用钢球股份有限公司 Vertical lapping machine adopts two-sided resin wheel to carry out the method for steel ball grinding
CN103286674A (en) * 2013-06-08 2013-09-11 上海泛联科技股份有限公司 Polishing plate used for polishing ceramic ball
FR3037519B1 (en) * 2015-06-17 2017-07-28 Ntn-Snr Roulements METHOD FOR CORRECTING A SURFACE OF A ROLLING BODY FOR A BEARING BEARING
US10508525B2 (en) * 2016-03-10 2019-12-17 Bubbletight, LLC Degradable downhole tools and\or components thereof, method of hydraulic fracturing using such tools or components, and method of making such tools or components
CN106736985B (en) * 2016-12-27 2018-08-03 重庆市青蓝机械制造有限公司 Steel ball special grinding machine
CN108161580B (en) * 2017-12-21 2019-11-05 重庆千乔机电有限公司 Anti-leakage process for valve
CN110270394B (en) * 2019-07-24 2023-10-20 清远市清新区谷城矿业开发投资有限公司 Aggregate crushing device and method
WO2021030746A1 (en) * 2019-08-14 2021-02-18 Cislo Lawrence E Centerless ball element machining system, machining wheel therefor, and method of making and using the same
DE102019122711A1 (en) * 2019-08-23 2021-02-25 Atlantic Gmbh Three-layer grinding wheel
DE102020115019A1 (en) 2020-06-05 2021-12-09 Schaeffler Technologies AG & Co. KG Grinding device for rolling elements and method for determining the degree of filling of a grinding device
RU2742266C1 (en) * 2020-07-08 2021-02-04 Акционерное общество «Обнинское научно-производственное предприятие «Технология» им. А. Г. Ромашина» Method of mechanical treatment of large-size ceramic articles of conical shape

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1163811A (en) * 1963-10-07 1969-09-10 Toolmasters Ltd Method of Forming a Grinding Member
JPH0487775A (en) * 1990-07-31 1992-03-19 Mitsubishi Heavy Ind Ltd Resin bond superabrasive grain grinding wheel
JPH058170A (en) * 1990-11-26 1993-01-19 Olympus Optical Co Ltd Spherical form polishing device
JPH04331058A (en) * 1991-04-26 1992-11-18 Olympus Optical Co Ltd Concave lens finishing method and device
JPH0542487A (en) * 1991-08-12 1993-02-23 Shibaura Eng Works Co Ltd Tightening and loosening device for bolt and nut
JPH0542467A (en) * 1991-08-13 1993-02-23 Toshiba Tungaloy Co Ltd Silicon nitride ceramic ball and polishing method thereof
JPH0648813A (en) * 1992-07-28 1994-02-22 Toshiba Corp Ceramic rolling body
TW317223U (en) * 1994-01-13 1997-10-01 Minnesota Mining & Mfg Abrasive article
JPH08112769A (en) * 1994-10-14 1996-05-07 Fuji Photo Film Co Ltd Abrasive tape
JP3148535B2 (en) * 1994-11-18 2001-03-19 トーヨーエイテック株式会社 Grinding equipment for bar-shaped workpieces
US5533923A (en) * 1995-04-10 1996-07-09 Applied Materials, Inc. Chemical-mechanical polishing pad providing polishing unformity
US6769969B1 (en) * 1997-03-06 2004-08-03 Keltech Engineering, Inc. Raised island abrasive, method of use and lapping apparatus
DE19816252A1 (en) * 1997-09-18 1999-04-01 Steag Ag Method of manufacturing spherical bodies from ceramic material
GB2335875B (en) * 1998-04-02 2000-08-30 Nsk Ltd Sphere grinding apparatus
JP2001025948A (en) * 1999-07-16 2001-01-30 Noritake Co Ltd Spherical grinding wheel
US6596395B1 (en) * 1999-07-23 2003-07-22 Ntn Corporation Balls of single crystal silicon and method of making the same
JP2001030160A (en) * 1999-07-23 2001-02-06 Ntn Corp Lapping ball for single crystal silicon and manufacture of the ball
TW427232U (en) * 2000-01-13 2001-03-21 Nat Science Council Polishing and processing machine for ceramic ball
JP2002263990A (en) * 2001-03-12 2002-09-17 Nami Cho Super-precision surface working method and working system
JP2003048168A (en) * 2001-08-07 2003-02-18 Noritake Co Ltd Thin cutting edge abrasive grain tool made of resin binding material
US20030050000A1 (en) * 2001-09-03 2003-03-13 Noritake Co., Limited Super-abrasive grinding wheel
JP2003117836A (en) * 2001-10-12 2003-04-23 Fuji Dies Kk Resin bond type grinding wheel for high efficiency grinding process
JP2003214435A (en) * 2001-11-13 2003-07-30 Allied Material Corp Minute hard polishing ball, and its manufacturing method and device
DE102005004038A1 (en) * 2005-01-27 2006-08-03 Guilleaume-Werk Gmbh Method for grinding spheres of ceramic material uses grinding disc with diamond grinding grains embedded in plastics resin binding

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006079444A1 *

Also Published As

Publication number Publication date
KR20070100904A (en) 2007-10-12
JP5294637B2 (en) 2013-09-18
BRPI0607081A2 (en) 2009-08-04
WO2006079444A1 (en) 2006-08-03
PL1893384T3 (en) 2016-09-30
DE102005004038A1 (en) 2006-08-03
RU2007126372A (en) 2009-03-10
EP1893384B1 (en) 2016-03-23
US20080171492A1 (en) 2008-07-17
RU2396160C2 (en) 2010-08-10
JP2008528304A (en) 2008-07-31
CN101107096A (en) 2008-01-16
US7722440B2 (en) 2010-05-25

Similar Documents

Publication Publication Date Title
EP1893384B1 (en) Method and device for grinding ceramic spheres
DE3316650C2 (en)
DE2523501A1 (en) METHOD OF MANUFACTURING A GRINDING TOOL FOR GRINDING AND POLISHING
DE602004012208T2 (en) Automated polishing of mechanical workpieces made of titanium or titanium alloys
DE2222947A1 (en) Grinding wheel
DE102009008881B4 (en) Rotary grindstone and process for its production
DE60300171T2 (en) Grinding stone for superfinishing
EP1827762B1 (en) Abrasive product and method for the production thereof
DE102005004041A1 (en) Ceramic balls grinding method, for use in ball grinding machine, involves grinding balls with grinding wheel having diamond abrasive grain in ceramic bond, where ceramic bond is burnt up to specific temperature, in oxygen-poor atmosphere
DE4022009A1 (en) Grinding and polishing small spherical lenses - involves working lens surface against abrasive layer flowing over conical mouth of rapidly rotating tube
EP0898504B1 (en) Abrasive body
DE2350405A1 (en) GRINDING OR POLISHING DEVICE
DE10131668A1 (en) Process for the abrasive processing of surfaces, in particular semiconductor wafers
DE102010045836A1 (en) Shaping tool for grinding tools, includes processing section having a top processing surface on which positive abrasive particles are applied galvanically
CH701596B1 (en) Dressing.
DE102007037791A1 (en) Process for production of rotationally symmetrical surface on workpiece by hard dry turning useful in machine and machine tool production technology is more cost effective than previous methods and avoids use of expensive coolants
DE19813464A1 (en) Plate substrate semi-finished product with both surfaces ground
DE102021108594A1 (en) Grinding wheel and method for grinding ceramic balls and device with such a grinding wheel
WO2002016082A1 (en) Honing tool
DE102021132468B3 (en) METHOD AND DEVICE FOR GRINDING THE FACE SIDES OF A ROTATIONALLY-SYMMETRIC WORKPIECE HAVING COATINGS WITH DIFFICULT TO MACHIN
DE102004005627A1 (en) Grinding device for grinding natural and artificial stone has grinding segments in form of massive grinding bodies with grinding grains and with part of surface in flat plane
DE10338819B3 (en) Method for finishing hard surfaces, e.g. glass, ceramics and glass-ceramics, especially polishing microstructures, uses polishing agent which is formed as precipitate by chemical or electrochemical reaction in applicator
EP0906173B1 (en) Device for grinding-in crankshafts or the like
DD206098A1 (en) GRINDING TOOL FOR MACHINING SPROEDHARTER MEDIA
DE2631294A1 (en) METHOD FOR GRINDING DIAMONDS AND DEVICE FOR CARRYING OUT THIS METHOD

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
RIN1 Information on inventor provided before grant (corrected)

Inventor name: POETZSCH, MICHAEL

Inventor name: KARB, WALTER

Inventor name: HAUBERT, MICHAEL

Inventor name: STOCK, KARL-OTTO

Inventor name: WEBER, MARCO

17P Request for examination filed

Effective date: 20071109

17Q First examination report despatched

Effective date: 20100329

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20150407

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20150819

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 782642

Country of ref document: AT

Kind code of ref document: T

Effective date: 20160415

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502006014832

Country of ref document: DE

REG Reference to a national code

Ref country code: RO

Ref legal event code: EPE

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20160323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160624

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

REG Reference to a national code

Ref country code: SK

Ref legal event code: T3

Ref document number: E 21096

Country of ref document: SK

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160723

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160725

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502006014832

Country of ref document: DE

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 12

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160623

26N No opposition filed

Effective date: 20170102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170131

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170131

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170131

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170106

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 13

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20170131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170106

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20060106

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160323

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20221216

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20230124

Year of fee payment: 18

Ref country code: AT

Payment date: 20230124

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20230131

Year of fee payment: 18

Ref country code: GB

Payment date: 20230124

Year of fee payment: 18

Ref country code: DE

Payment date: 20230124

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SK

Payment date: 20231229

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: RO

Payment date: 20231227

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20231208

Year of fee payment: 19