EP0808693B1 - Method and apparatus for dressing the CBN or diamond ring layer of a grinding wheel - Google Patents

Method and apparatus for dressing the CBN or diamond ring layer of a grinding wheel Download PDF

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Publication number
EP0808693B1
EP0808693B1 EP97102464A EP97102464A EP0808693B1 EP 0808693 B1 EP0808693 B1 EP 0808693B1 EP 97102464 A EP97102464 A EP 97102464A EP 97102464 A EP97102464 A EP 97102464A EP 0808693 B1 EP0808693 B1 EP 0808693B1
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Prior art keywords
disc
workpiece
tool
spindle
grinding
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EP97102464A
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German (de)
French (fr)
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EP0808693A1 (en
Inventor
Hans-Robert Dr.-Ing. Meyer
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Saint Gobain Diamantwerkzeuge GmbH and Co KG
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Saint Gobain Winter Diamantwerkzeuge GmbH and Co KG
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    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/18—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools
    • 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
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
    • B24B53/08—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels controlled by information means, e.g. patterns, templets, punched tapes or the like

Definitions

  • the invention relates to a method and an apparatus for machining an annular CBN or diamond coating of grinding wheels on the circumference and / or on the front side according to the generic term of Claims 1 and 4. From US 4,899,718 A are such a device and such a method is known.
  • JP 5131 364 describes a method for determining the roundness of a dressing Grinding wheel became known. This is done with the help of Determination of the contact sound, whereby the roundness is then taken as given becomes when the rectified output signal of the sensor is approximately is constant.
  • the face and cylindrical grinding of CBN and diamond discs is usually done with SiC disks.
  • the aim is to create a workpiece disc sufficient flatness on the face or sufficient roundness to give the peripheral surface. With this processing it is desirable that Concentricity and axial runout are within the required tolerance.
  • the coating of the workpiece disc should only be removed as far as to achieve one qualitatively satisfactory end surface is absolutely necessary. An over Processing beyond this point extends the processing time and leads to an undesirable removal on the workpiece the tool disc.
  • the work described was carried out so far also by hand.
  • the operator drives the tool disk more or less quickly against the rotating workpiece disc, whereby he must ensure that the contact between the panes is not abruptly, because otherwise there is an additional out-of-roundness or unevenness can be generated, eliminating the processing time increases.
  • the operator selects the delivery according to "feeling" and ends the editing process if based on his experience has the impression that sufficient roundness and flatness is achieved have been. This will be ensured by a subsequent check. In which Previously used errors cannot be excluded. Besides, is it is relatively expensive.
  • the invention is therefore based on the object of a method and an apparatus for processing of an annular CBN and diamond coating of grinding wheels create that can be carried out completely automatically and at optimal Manufacturing times caused little effort.
  • the sound is measured from the workpiece disk driving spindle is generated.
  • perfect roundness of Spindle and workpiece disc and with unbalance-free storage are likely to free rotating drive of the disc vibrations do not occur. In the In practice, however, they occur; however, they can be filtered appropriately or the like can be eliminated. Noticeably measurable and for that Control exploitable vibrations occur during machining by two Factors on: The contact of the tool disc with the workpiece and Out of roundness or unevenness of the coating of the workpiece disc. By Out of roundness caused changes in force when contacting the tool disc and workpiece disc occur during their revolutions corresponding vibrations of the spindle.
  • the processing takes place according to a predetermined program, which follows the geometrical and material relationships. As long as flatness or Roundness have not yet been achieved, as described, on the spindle for the workpiece disc generates specific vibrations that are used to display this process can be used. The moment that Roundness or flatness has been achieved, the vibrations go against Zero. The grinding process can be finished and the tool disc in the Starting position can be retracted.
  • At least two ultrasonic sensors can be used become. They can be used so that their signals are optional or can be used summing. In the latter case, both sensors must be used index the desired state so that the start-up or processing process is ended.
  • An ultrasonic sensor is also conceivable for the control of the starting process and the other for the termination of the editing process.
  • the output signals of the sensors are naturally a mixture of different ones Frequencies.
  • a diamond grinding wheel 10 in FIG. 1 (workpiece wheel) has a cup-shaped support body 12 and one cone-shaped abrasive coating 14. After pressing the Grinding wheel 10 is required to process covering 14, to give him the desired flatness on the face and impart the desired roundness on the peripheral surface. The same applies to dressing the grinding wheel 10 after a certain operating time.
  • the surface 14 is ground with the aid of a silicon carbide grinding wheel either in position 16 or 18, driven by a motor 20 and 22, respectively are.
  • the associated grinding machine is not shown. It also contains motors for the delivery of the disk 16 or 18 (tool disk), which in FIG. 1 is 24 or 26 are designated. For the cross feed according to arrow 28 an additional motor is required, but for reasons of simplification is not shown.
  • the workpiece grinding wheel 10 is using a spindle clamped in the grinding machine.
  • the spindle is indicated with 30. It is driven by a motor 32.
  • Two ultrasonic sensors 34, 36 are assigned to the spindle 30.
  • the output signals of the sensors 34, 36 go up Frequency analysis stages 38 and 40. Their output is with a control device 42 for the individual motors. This is indicated by dashed lines.
  • the Control device 42 is also assigned a programming stage 44. The arrangement shown works as follows.
  • the workpiece grinding wheel 10 is clamped in the grinding machine.
  • the tool grinding wheel 16 or 18 is at a corresponding distance from the abrasive coating 14. This distance is shown in FIG. 1 less than it normally exists.
  • the tool grinding wheel 16 or 18 is moved in the direction of the arrows onto the covering 14 with the aid of the motor 24 or 26. Because of the geometrical relationships, the route is known, so that most of the route can be covered at a relatively high speed. The last section of the route can then be covered in what is known as creeping operation.
  • a first contact of the two tool disks 16 or 18 with the coating 14 leads to a significantly increased vibration amplitude of the spindle 30, which can be seen in FIG. 2a. 2 to 4, the signal curves of the sensors 34, 36 are plotted in decibels (dB) over time.
  • the curve in FIG. 2b or 3b is obtained.
  • the first major jump in the curve according to FIGS. 2b and 3b indicates that the grinding wheel 16 or 18 has come into contact with the covering 14.
  • the actual machining process which is predetermined by the programming stage 44, now begins.
  • the sensors according to FIG. 1 are piezo crystals can be the one originating from the spindle Measure the sound pressure level.

Abstract

The method involves using a tool grinding disc (16,18), esp. with an SiC coating, where the tool grinding disc is pressed against the workpiece disc (10) at a first speed, then the tool grinding disc is operated at reduced speed until the coating is round or flat. The body sound of the workpiece disc spindle is measured with one or more ultrasonic sensors (34,36) and analysed. The movement of the tool disc against the workpiece disc is performed automatically and at a defined speed until contact is made. A lower speed is used after contact is detected by one or both ultrasonic sensors and the grinding process is terminated when at least one sensor detects roundness or flatness over one workpiece disc rotation.

Description

Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zum Bearbeiten eines ringförmigen CBN- oder Diamantbelags von Schleifscheiben am Umfang und/oder an der Stirnseite nach dem Oberbegriff der Ansprüche 1 und 4. Aus US 4 899 718 A sind eine solche Vorrichtung und ein solches Verfahren bekannt.The invention relates to a method and an apparatus for machining an annular CBN or diamond coating of grinding wheels on the circumference and / or on the front side according to the generic term of Claims 1 and 4. From US 4,899,718 A are such a device and such a method is known.

Aus US-A-4899718 ist eine Vorrichtung zum Abrichten einer Schleifscheibe bekannt geworden, bei der ein akustischer Sensor die Berührung zwischen der Werkzeug- und der Werkstückscheibe ermittelt. Durch ein Heranfahren der Werkzeugschleifscheibe an die Werkstückscheibe an verschiedenen axial beabstandeten Punkten wird die Position festgehalten und gespeichert, damit anschließend mit Hilfe einer Schablone das Abrichten stattfinden kann. Alternativ ist vorgesehen, den Schallsensor an der Spindel der Werkzeugscheibe unterzubringen.From US-A-4899718 is a device for dressing a grinding wheel become known in which an acoustic sensor the contact between the tool and workpiece disc are determined. By driving up the tool grinding wheel to the workpiece wheel at different axial spaced points, the position is recorded and saved so the dressing can then take place using a template. Alternatively is provided, the sound sensor on the spindle of the tool disc accommodate.

Aus JP 5131 364 ist ein Verfahren zur Feststellung der Rundheit einer abzurichtenden Schleifscheibe bekannt geworden. Dies geschieht mit Hilfe der Ermittlung des Berührungsschalls, wobei die Rundheit dann als gegeben angesehen wird, wenn das gleichgerichtete Ausgangssignal des Sensors annähernd konstant ist.JP 5131 364 describes a method for determining the roundness of a dressing Grinding wheel became known. This is done with the help of Determination of the contact sound, whereby the roundness is then taken as given becomes when the rectified output signal of the sensor is approximately is constant.

Das Plan- und Rundschleifen von CBN- und Diamantscheiben erfolgt üblicherweise mit SiC-Scheiben. Angestrebt wird, den Werkstückscheiben eine ausreichende Planheit an der Stirnfläche bzw. eine ausreichende Rundheit an der Umfangsfläche zu verleihen. Bei dieser Bearbeitung ist erwünscht, dass Rund- und Planlauf in der geforderten Toleranz liegen. Der Belag der Werkstückscheibe soll nur so weit abgetragen werden, wie für die Erzielung einer qualitativ zufriedenstellenden Endfläche unbedingt erforderlich. Eine über diesen Punkt hinausgehende Bearbeitung verlängert die Bearbeitungszeit und führt zu einem unerwünschten Abtrag an der Werkstück- aber auch an der Werkzeugscheibe.The face and cylindrical grinding of CBN and diamond discs is usually done with SiC disks. The aim is to create a workpiece disc sufficient flatness on the face or sufficient roundness to give the peripheral surface. With this processing it is desirable that Concentricity and axial runout are within the required tolerance. The coating of the workpiece disc should only be removed as far as to achieve one qualitatively satisfactory end surface is absolutely necessary. An over Processing beyond this point extends the processing time and leads to an undesirable removal on the workpiece the tool disc.

Gemäß firmeninternem Stand der Technik erfolgte der beschriebene Arbeitsvorgang bisher auch von Hand. Der Bediener fährt die Werkzeugscheibe mehr oder weniger schnell gegen die rotierende Werkstückscheibe, wobei er Sorge dafür tragen muß, dass der Kontakt zwischen den Scheiben nicht stoßartig erfolgt, weil andernfalls eine zusätzliche Unrundheit oder Unebenheit erzeugt werden kann, die zu beseitigen die Bearbeitungszeit noch erhöht. Während des Bearbeitens wählt der Bediener die Zustellung nach "Gefühl" und beendet den Bearbeitungsvorgang, wenn er aufgrund seiner Erfahrung den Eindruck hat, dass ausreichende Rundheit und Planheit erreicht worden sind. Dies wird durch anschließende Prüfung sicher gestellt. Bei dem bisher ausgeübten verfahren sind Fehler nicht auszuschließen. Außerdem ist es verhältnismäßig aufwendig.According to the company's internal state of the art, the work described was carried out so far also by hand. The operator drives the tool disk more or less quickly against the rotating workpiece disc, whereby he must ensure that the contact between the panes is not abruptly, because otherwise there is an additional out-of-roundness or unevenness can be generated, eliminating the processing time increases. During processing, the operator selects the delivery according to "feeling" and ends the editing process if based on his experience has the impression that sufficient roundness and flatness is achieved have been. This will be ensured by a subsequent check. In which Previously used errors cannot be excluded. Besides, is it is relatively expensive.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Bearbeiten eines ringförmigen CBN- und Diamantbelags von Schleifscheiben zu schaffen, das vollständig automatisch durchgeführt werden kann und bei optimalen Fertigungszeiten einen geringen Aufwand verursacht.The invention is therefore based on the object of a method and an apparatus for processing of an annular CBN and diamond coating of grinding wheels create that can be carried out completely automatically and at optimal Manufacturing times caused little effort.

Diese Aufgabe wird durch die Merkmale der Ansprüche 1 und 4 gelöst.This object is solved by the features of claims 1 and 4.

Erfindungsgemäß wird der Schall gemessen, der von der die Werkstückscheibe antreibenden Spindel erzeugt wird. Bei vollkommener Rundheit von Spindel und Werkstückscheibe und bei unwuchtfreier Lagerung dürften bei freidrehendem Antrieb der Scheibe Schwingungen nicht auftreten. In der Praxis treten sie gleichwohl auf; sie können jedoch durch entsprechende Filterung oder dergleichen eliminiert werden. Merklich meßbare und für die Steuerung ausnutzbare Schwingungen treten bei der Bearbeitung durch zwei Faktoren auf: Die Berührung der Werkzeugscheibe mit dem Werkstück und Unrundheit bzw. Unebenheit des Belages der Werkstückscheibe. Die durch Unrundheit verursachten Kraftänderungen, die beim Kontakt von Werkzeugscheibe und Werkstückscheibe bei ihren Umdrehungen auftreten, bewirken entsprechende Schwingungen der Spindel. Wird die Werkzeugscheibe mit vorgegebener einstellbarer Vorschubgeschwindigkeit gegen den Werkstückbelag gefahren, dann kann dieser Vorgang sofort beendet werden, sobald der Sensor den Kontakt der abtragenden Scheibe mit der Werkstückscheibe feststellt. Das Signal der Sensoren wird analysiert, wobei relativ einfach zwischen dem berührungsfreien und dem Berührungszustand zwischen den Scheiben dadurch unterschieden werden kann, dass sich seine Amplitude signifikant ändert. Sobald eine Berührung festgestellt wird, wird ein entsprechendes Signal auf den Zustellantrieb gegeben. Dieser steuert die Geschwindigkeit auf einen deutlich reduzierten Wert herunter, der einer vorgebenen Zustellgeschwindigkeit für die Bearbeitung entspricht. Es ist auch denkbar, die Zustellung stufenweise in vorgegebenen Zeiteinheiten vorzunehmen.According to the invention, the sound is measured from the workpiece disk driving spindle is generated. With perfect roundness of Spindle and workpiece disc and with unbalance-free storage are likely to free rotating drive of the disc vibrations do not occur. In the In practice, however, they occur; however, they can be filtered appropriately or the like can be eliminated. Noticeably measurable and for that Control exploitable vibrations occur during machining by two Factors on: The contact of the tool disc with the workpiece and Out of roundness or unevenness of the coating of the workpiece disc. By Out of roundness caused changes in force when contacting the tool disc and workpiece disc occur during their revolutions corresponding vibrations of the spindle. Will the tool disc with predefined adjustable feed rate against the workpiece surface driven, then this process can be ended immediately as soon as the Sensor determines the contact of the abrasive disc with the workpiece disc. The signal from the sensors is analyzed, being relatively simple between the non-contact and the state of contact between the Slices can be distinguished by the fact that its amplitude is significant changes. As soon as a touch is detected, a corresponding one Signal given to the feed drive. This controls the speed to a significantly reduced value, that of a predefined one Delivery speed for processing corresponds. It is also conceivable carry out the delivery step by step in predetermined time units.

Die Bearbeitung erfolgt nach einem vorgegebenen Programm, das sich nach den geometrischen und Materialverhältnissen richten. Solange Planheit bzw. Rundheit noch nicht erzielt sind, werden, wie beschrieben, an der Spindel für die Werkstückscheibe spezifische Schwingungen erzeugt, die zur Anzeige dieses Vorgangs herangezogen werden können. In dem Augenblick, in dem Rundheit bzw. Planheit erzielt worden ist, gehen die Schwingungen gegen Null. Der Schleifvorgang kann beendet und die Werkzeugscheibe in die Ausgangsstellung zurückgefahren werden.The processing takes place according to a predetermined program, which follows the geometrical and material relationships. As long as flatness or Roundness have not yet been achieved, as described, on the spindle for the workpiece disc generates specific vibrations that are used to display this process can be used. The moment that Roundness or flatness has been achieved, the vibrations go against Zero. The grinding process can be finished and the tool disc in the Starting position can be retracted.

Erfindungsgemäß können mindestens zwei Ultraschallsensoren verwendet werden. Sie können so eingesetzt werden, dass ihre Signale fakultativ oder summierend verwendet werden. Im letzteren Fall müssen jeweils beide Sensoren den gewünschten Zustand indizieren, damit der Anfahr- bzw. der Verarbeitungsvorgang beendet wird. Es ist auch denkbar, einen Ultraschallsensor für die Steuerung des Anfahrvorgangs und den anderen für die Beendigung des Bearbeitungsvorgangs zu verwenden.According to the invention, at least two ultrasonic sensors can be used become. They can be used so that their signals are optional or can be used summing. In the latter case, both sensors must be used index the desired state so that the start-up or processing process is ended. An ultrasonic sensor is also conceivable for the control of the starting process and the other for the termination of the editing process.

Die Ausgangssignale der Sensoren sind naturgemäß ein Gemisch verschiedener Frequenzen. Um sie besser zu analysieren, ist es erfindungsgemäß vorteilhalft, aus diesen eine Mittelwertkurve zu bilden. Steigt zum Beispiel die Mittelwertkurve relativ abrupt an, ist dies das Anzeichen dafür, dass die Werkzeugscheibe die Werkstückscheibe berührt hat. Liegt Planheit bzw. Rundheit vor, ist die Mittelwertkurve annähernd konstant. Der Bearbeitungsvorgang kann dann beendet werden. The output signals of the sensors are naturally a mixture of different ones Frequencies. In order to analyze them better, it is according to the invention advantageous to form a mean value curve from these. For example, increases the mean value curve is relatively abrupt, this is an indication that the Tool disc has touched the workpiece disc. Is flatness or Roundness before, the mean curve is almost constant. The editing process can then be ended.

Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.

Fig. 1
zeigt schematisch die Bearbeitung einer Diamantscheibe mit einer Werkzeugscheibe und einer entsprechenden Steuervorrichtung für die Werkzeugscheibe.
Fig. 2
zeigt das Ausgangssignal eines ersten Sensors bei einem Umfangsschleifen der Werkstückscheibe nach Fig. 1 im nicht geglätteten (a) und geglätteten Zustand (b).
Fig. 3
zeigt das Ausgangssignal eines ersten Sensors für das Planschleifen der Werkstückscheibe nach Fig. 1 im nicht geglätteten und geglätteten Zustand.
Fig. 4
zeigt das Ausgangssignal eines zweiten Sensors im geglätteten und nicht geglätteten Zustand.
The invention is explained in more detail below with reference to drawings.
Fig. 1
shows schematically the processing of a diamond wheel with a tool wheel and a corresponding control device for the tool wheel.
Fig. 2
shows the output signal of a first sensor during a peripheral grinding of the workpiece disc according to FIG. 1 in the non-smoothed (a) and smoothed state (b).
Fig. 3
shows the output signal of a first sensor for surface grinding of the workpiece disc of FIG. 1 in the non-smoothed and smoothed state.
Fig. 4
shows the output signal of a second sensor in the smoothed and unsmoothed state.

Eine Diamantschleifscheibe 10 in Fig. 1 (Werkstückscheibe) weist einen topfförmigen Trägerkörper 12 auf und einen kegelringförmigen Schleifbelag 14. Nach dem Pressen der Schleifscheibe 10 ist erforderlich, den Belag 14 zu bearbeiten, um ihm die gewünschte Planheit an der Stirnfläche und die gewünschte Rundheit an der Umfangsfläche zu verleihen. Entsprechendes gilt beim Abrichten der Schleifscheibe 10 nach einer gewissen Betriebszeit.A diamond grinding wheel 10 in FIG. 1 (workpiece wheel) has a cup-shaped support body 12 and one cone-shaped abrasive coating 14. After pressing the Grinding wheel 10 is required to process covering 14, to give him the desired flatness on the face and impart the desired roundness on the peripheral surface. The same applies to dressing the grinding wheel 10 after a certain operating time.

Das Schleifen des Belages 14 erfolgt mit Hilfe einer Siliziumkarbid-Schleifscheibe entweder in Position 16 oder 18, die von einem Motor 20 bzw. 22 drehend angetrieben sind. Die zugehörige Schleifmaschine ist nicht dargestellt. Sie enthält auch Motoren für das Zustellen der Scheibe 16 oder 18 (Werkzeugscheibe), die in Fig. 1 mit 24 bzw. 26 bezeichnet sind. Für den Quervorschub gemäß Pfeil 28 ist ein weiterer Motor erforderlich, der jedoch aus Vereinfachungsgründen nicht gezeigt ist.The surface 14 is ground with the aid of a silicon carbide grinding wheel either in position 16 or 18, driven by a motor 20 and 22, respectively are. The associated grinding machine is not shown. It also contains motors for the delivery of the disk 16 or 18 (tool disk), which in FIG. 1 is 24 or 26 are designated. For the cross feed according to arrow 28 an additional motor is required, but for reasons of simplification is not shown.

Die Werkstückschleifscheibe 10 wird mit Hilfe einer Spindel in der Schleifmaschine eingespannt. Die Spindel ist mit 30 angedeutet. Sie wird von einem Motor 32 angetrieben. Der Spindel 30 sind zwei Ultraschallsensoren 34, 36 zugeordnet. Die Ausgangssignale der Sensoren 34, 36 gehen auf Frequenz-Analysierstufen 38 bzw. 40. Deren Ausgang ist mit einer Steuervorrichtung 42 für die einzelnen Motoren verbunden. Dies ist durch gestrichelte Linien angedeutet. Der Steuervorrichtung 42 ist auch eine Programmierstufe 44 zugeordnet. Die gezeigte Anordnung arbeitet wie folgt.The workpiece grinding wheel 10 is using a spindle clamped in the grinding machine. The spindle is indicated with 30. It is driven by a motor 32. Two ultrasonic sensors 34, 36 are assigned to the spindle 30. The output signals of the sensors 34, 36 go up Frequency analysis stages 38 and 40. Their output is with a control device 42 for the individual motors. This is indicated by dashed lines. The Control device 42 is also assigned a programming stage 44. The arrangement shown works as follows.

Zunächst wird die Werkstückschleifscheibe 10 in die Schleifmaschine eingespannt. Die Werkzeugschleifscheibe 16 oder 18 hat jeweils einen entsprechenden Abstand zum Schleifbelag 14. Dieser Abstand ist in Fig. 1 geringer eingezeichnet als er normalerweise besteht. Nach dem Starten der Schleifmaschine, was durch einen Bediener initiiert werden oder auch automatisch erfolgen kann, werden mit Hilfe des Motors 24 bzw. 26 die Werkzeugschleifscheibe 16 oder 18 in Richtung der Pfeile auf den Belag 14 gefahren. Aufgrund der geometrischen Verhältnisse ist der Weg bekannt, so daß der größte Teil des Weges mit relativ hoher Geschwindigkeit zurückgelegt werden kann. Der letzte Wegabschnitt kann dann im sogenannten Schleichbetrieb zurückgelegt werden. Unabhängig davon, ob ein Schleichbetrieb vorgesehen ist oder nicht, führt eine erste Berührung der beiden Werkzeugscheibe 16 oder 18 mit dem Belag 14 zu einer deutlich verstärkten Schwingungsamplitude der Spindel 30, was in Fig. 2a zu erkennen ist. In den Figuren 2 bis 4 sind die Signalkurven der Sensoren 34, 36 in Dezibel (dB) über die Zeit aufgetragen. Bezüglich der Scheibe 16 oder 18 wird bei entsprechender Glättung der Kurve nach Fig. 2a bzw. nach Fig. 3a die Kurve in Fig. 2b bzw. 3b erhalten. Der erste größere Sprung in der Kurve nach Fig. 2b bzw. 3b zeigt an, daß ein Kontakt der Schleifscheibe 16 oder 18 mit dem Belag 14 erfolgt ist. Nunmehr beginnt der eigentliche Bearbeitungsvorgang, der durch die Programmierstufe 44 vorgegeben ist. Da zunächst weder Planheit noch Rundheit des Belages 14 vorliegt, äußert sich dies in entsprechenden Schwingungen der Spindel 30. Dies ist am linken Ende der Kurve nach Fig. 4a zu erkennen. Sobald jedoch Rundheit eintritt, ergibt sich zwar ein höherer Schallpegel, der jedoch nur minimale Schwankungen aufweist.
Eine Glättung der Kurve nach Fig. 4a ergibt beim erwünschten Bearbeitungsergebnis eine Konstante gemäß Fig. 4b. Sie ist ein Indiz dafür, daß Planheit bzw. Rundheit nunmehr erreicht ist. Die Steuervorrichtung 42 steuert die Antriebe entsprechend an, um den Bearbeitungsvorgang zu stoppen und die Schleifscheibe 16 oder 18 in ihre Ausgangsposition zurückzufahren für die Bearbeitung der nächsten Position bzw. der nächsten Werkstückscheibe.First, the workpiece grinding wheel 10 is clamped in the grinding machine. The tool grinding wheel 16 or 18 is at a corresponding distance from the abrasive coating 14. This distance is shown in FIG. 1 less than it normally exists. After the grinding machine has been started, which can be initiated by an operator or can also be carried out automatically, the tool grinding wheel 16 or 18 is moved in the direction of the arrows onto the covering 14 with the aid of the motor 24 or 26. Because of the geometrical relationships, the route is known, so that most of the route can be covered at a relatively high speed. The last section of the route can then be covered in what is known as creeping operation. Regardless of whether creeping operation is provided or not, a first contact of the two tool disks 16 or 18 with the coating 14 leads to a significantly increased vibration amplitude of the spindle 30, which can be seen in FIG. 2a. 2 to 4, the signal curves of the sensors 34, 36 are plotted in decibels (dB) over time. With regard to the disk 16 or 18, with a corresponding smoothing of the curve according to FIG. 2a or FIG. 3a, the curve in FIG. 2b or 3b is obtained. The first major jump in the curve according to FIGS. 2b and 3b indicates that the grinding wheel 16 or 18 has come into contact with the covering 14. The actual machining process, which is predetermined by the programming stage 44, now begins. Since there is initially no flatness or roundness of the covering 14, this is expressed in corresponding vibrations of the spindle 30. This can be seen at the left end of the curve according to FIG. 4a. As soon as roundness occurs, there is a higher sound level, but there are only minimal fluctuations.
Smoothing the curve according to FIG. 4a results in a constant according to FIG. 4b for the desired machining result. It is an indication that flatness or roundness is now achieved. The control device 42 controls the drives accordingly in order to stop the machining process and to return the grinding wheel 16 or 18 to its starting position for machining the next position or the next workpiece wheel.

Es sei noch angemerkt, daß die Sensoren gemäß Fig. 1 Piezokristalle sein können, die den von der Spindel ausgehenden Schallpegeldruck messen.It should also be noted that the sensors according to FIG. 1 are piezo crystals can be the one originating from the spindle Measure the sound pressure level.

Claims (4)

  1. A method for machining a circular CBN or diamond layer (14) of a grinding disc (10) at the circumference and/or the front side thereof, the disc being rotatably driven by a spindle, and the machining is carried out by means of a rotatably driven tool grinding disc (18), in particular having a SiC layer characterized in that by means of two or more ultrasonic sensors (34, 36) the vibration is measured and analyzed generated by the spindle (30) of the workpiece grinding disc (10), further the tool disc (18) is at first automatically moved against the workpiece grinding disc (10) with a predetermined first speed until at least one of the ultrasonic sensors (34, 36) determins a contact with the tool disc (18) by a significantly amplified vibration amplitude of spindle (30) and that the tool disc (18) is fed with a second much lower speed until at least one of the ultrasonic sensors (34, 36) determins the roundness or planeness of the grinding layer of the workpiece disc (10) which is expressed in corresponding vibrations of spindle (30).
  2. The method of claim 1, characterized in that an average value curve is formed by the output signals of the sensors (34, 36) and the feed of the tool disc (18) with the second speed or the driving of the tool disc (18) or the workpiece disc (10) is stopped if the average curve is approximately constant.
  3. The method of claim 1 or 2, characterized in that the feed speed or the feed of the tool disc (18) during its contact with workpiece disc (10) is controlled in dependence upon the height of the level of the vibration
  4. An apparatus for machining a circular CBN or diamond layer at the circumference and/or the front side of a grinding disc, comprising at least one tool grinding disc (18), having in particular a layer of SiC, which is rotatable driven by a first driving means (32) and having holding means which can be moved towards and away with respect to the workpiece disc (10) by a second driving means (26), receiving means for the rotatable support of the workpiece disc (10), a third driving means (32) for rotating the workpiece disc (10) through a spindle (30) and at least one ultrasonic sensor (34, 36) for the measurement of the contact of the workpiece disc (10) with the tool disc (18), characterized in that at least two ultrasonic sensors (34, 36) are associated with the spindle (30), one of the sensors detects the contact of the workpiece disc (18) by a significantly amplified vibration amplitude of spindle (30) and another sensor detects the roundness or the planeness of the grinding layer of the workpiece disc (10) which is expressed in corresponding vibration of spindle (30), in that evaluating means (38, 40) are provided for the output signals of the ultrasonic sensors (34, 36) and in that a control means (42) is provided for the driving means (24, 26, 32) for the control thereof in response to the output signals of the ultrasonic sensors (34, 36).
EP97102464A 1996-05-24 1997-02-15 Method and apparatus for dressing the CBN or diamond ring layer of a grinding wheel Expired - Lifetime EP0808693B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19620972A DE19620972A1 (en) 1996-05-24 1996-05-24 Method and device for processing an annular CBN or diamond coating of grinding wheels
DE19620972 1996-05-24

Publications (2)

Publication Number Publication Date
EP0808693A1 EP0808693A1 (en) 1997-11-26
EP0808693B1 true EP0808693B1 (en) 2001-12-05

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EP97102464A Expired - Lifetime EP0808693B1 (en) 1996-05-24 1997-02-15 Method and apparatus for dressing the CBN or diamond ring layer of a grinding wheel

Country Status (5)

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US (1) US5885132A (en)
EP (1) EP0808693B1 (en)
AT (1) ATE210002T1 (en)
DE (2) DE19620972A1 (en)
DK (1) DK0808693T3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1089657C (en) * 1998-07-24 2002-08-28 中国科学院上海硅酸盐研究所 Ultrahard compounded tool, its prepn. method and application
SE516954C2 (en) * 1999-12-14 2002-03-26 Lidkoeping Machine Tools Ab A method and apparatus for determining the roundness of a rotating workpiece
US6702654B2 (en) * 2001-02-07 2004-03-09 Agere Systems Inc. Conditioning wheel for conditioning a semiconductor wafer polishing pad and method of manufacture thereof
US10391609B1 (en) * 2017-09-05 2019-08-27 Optipro Systems, LLC Modular contact assembly for rotating machine tool

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS585148B2 (en) * 1976-10-15 1983-01-29 豊田工機株式会社 Grinding wheel repair method and device
JPS5835831B2 (en) * 1978-04-18 1983-08-05 豊田工機株式会社 Grinder
US4359841A (en) * 1979-11-08 1982-11-23 Trw Inc. Grinding wheel wear detection and dressing method
CH654782A5 (en) * 1982-03-19 1986-03-14 Maag Zahnraeder & Maschinen Ag METHOD AND DEVICE FOR COMPENSATING THE WEAR OF AN ADJUSTABLE GRINDING WHEEL DRESSING TOOL.
CH658617A5 (en) * 1982-12-24 1986-11-28 Maag Zahnraeder & Maschinen Ag TOOTHED RIM GRINDING MACHINE WITH DOUBLE TAPERED GRINDING WHEEL.
JPH066262B2 (en) * 1986-01-23 1994-01-26 豊田工機株式会社 Wheeling equipment for grinding wheels
US4744348A (en) * 1986-11-12 1988-05-17 Diesel Kiki Co., Ltd. Dressing apparatus for grinding wheels
JPH01109071A (en) * 1987-10-22 1989-04-26 Toyoda Mach Works Ltd Truing device for grinding wheel
JP2810489B2 (en) * 1990-05-30 1998-10-15 株式会社ノリタケカンパニーリミテド Grinding wheel
JPH04256574A (en) * 1991-02-05 1992-09-11 Toyoda Mach Works Ltd Correction method for electrodeposited grinding wheel
JP3165488B2 (en) * 1991-11-06 2001-05-14 株式会社ノリタケカンパニーリミテド Dressing state judgment method
JPH0760642A (en) * 1993-08-30 1995-03-07 Rikagaku Kenkyusho Electrolytic dressing grinding method and device
JP3218136B2 (en) * 1993-12-15 2001-10-15 株式会社ボッシュオートモーティブシステム Whetstone peripheral surface condition determination device
JP2750499B2 (en) * 1994-01-25 1998-05-13 オークマ株式会社 Method for confirming dressing of superabrasive grindstone in NC grinder

Also Published As

Publication number Publication date
DE19620972A1 (en) 1997-11-27
DK0808693T3 (en) 2002-03-04
US5885132A (en) 1999-03-23
EP0808693A1 (en) 1997-11-26
ATE210002T1 (en) 2001-12-15
DE59705615D1 (en) 2002-01-17

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