EP0270769B1 - Method for grinding plane-parallel annular surfaces of disk-shaped workpieces - Google Patents

Method for grinding plane-parallel annular surfaces of disk-shaped workpieces Download PDF

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Publication number
EP0270769B1
EP0270769B1 EP87114773A EP87114773A EP0270769B1 EP 0270769 B1 EP0270769 B1 EP 0270769B1 EP 87114773 A EP87114773 A EP 87114773A EP 87114773 A EP87114773 A EP 87114773A EP 0270769 B1 EP0270769 B1 EP 0270769B1
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EP
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Prior art keywords
sides
grinding
point
machined
advance
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EP87114773A
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German (de)
French (fr)
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EP0270769A1 (en
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Heinz Günter Schmitz
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Supfina Maschinenfabrik Hentzen GmbH and Co KG
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Supfina Maschinenfabrik Hentzen GmbH and Co KG
Van Nelle - Lassie BV
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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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/17—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S451/00—Abrading
    • Y10S451/902—Brake abrading

Definitions

  • the invention relates to a 'method for grinding plane-parallel annular surfaces on disc-shaped workpieces, in particular on brake disks of motor vehicle disc brakes, in which the workpieces are machined from both sides with side grinding disks on their surfaces to be machined, based on their desired position, and the machining takes place in several phases with different feed rates.
  • Such a method is known from DE-B 2 122 798.
  • the grinding wheels are blocked in their positions when the feed is switched off and the workpiece is fired. By repeating these steps with the same or reduced feed, the workpiece is ground down to the finished size.
  • This pre-grinding (loc. Column 3, line 26) takes place at the same feed speeds, but with different grinding allowances, that is, with a different duration if necessary. So it is possible that one wheel is still grinding while the other is already stopping because the grinding allowance on its side has already been processed. An elastic deformation cannot be ruled out.
  • the object of the present invention is, in contrast, to improve the method of the type mentioned in such a way that the accuracy of the plane parallelism is further increased by the fact that when working with grinding thicknesses of different thicknesses, elastic deformations of the workpieces are avoided on both sides, in particular in the final phase.
  • the procedure should also be simpler and faster in the process.
  • This object is achieved in that when the entire machining process has progressed so far that both grinding wheels are in contact with the workpiece, the machining in the following phase to a selected intermediate point at which the workpiece - in relation to the target -Location of the working surface - has the same grinding grinding allowance on both sides, with different feed speeds, which are coordinated in such a way that the intermediate point is reached on both sides at the same time and then the removal is carried out on both sides with the same and increased feed speed.
  • FIG. 1 shows a brake disc 1 as a workpiece. Its two side surfaces 2 and 3, which run at a distance h, are to be machined so that they are to a large extent flat, exactly parallel to one another and exactly perpendicular to the axis of rotation A.
  • the contour of the brake disc 1 before grinding is shown extremely exaggerated and designated 2 'or 3'. This protruding contour 2 ', 3' must be machined to the desired position of the side surfaces 2, 3 shown in a thick line.
  • no elastic deformation should occur due to different pressing of the grinding tools, which would result in springing back into the starting position after removal of the contact pressure and then permanent unevenness or inaccuracy in the plane parallelism.
  • the brake disc 1 is received between the jaws 4 and 5 and rotated about the axis of rotation A.
  • the side surfaces 2, 3 are processed with side grinding wheels 6, 7, which rotate and are advanced in the direction of the arrows drawn onto the side surfaces 2, 3 or their contours 2 ', 3'.
  • the ordinate denotes the path s of both grinding wheels 6, 7 in the feed direction and the speed v of both grinding wheels 6, 7 in the feed direction as a function of the time which is shown on the abscissa.
  • the feed speeds of the two grinding wheels 6, 7 are designated v1, v2, v3 and v3 ', v4, v5, v6.
  • the feed speeds are the same for both grinding wheels 6,7 up to time t2; they are also the same from t3 to the end of processing at t6; however, they differ between t2 and t3, namely v3 and v3 '.
  • the line starting from the origin of the diagram in FIG. 2 shows the path s as a function of the time t.
  • the path from P1 to P6 corresponds to the distance 1, which is also shown in FIG. 1.
  • the grinding wheels 6, 7 first move from an initial position (not shown in FIG. 1) at the same speed vi to the initial position P 1 , which they reach at time t 1 . In P 1 there must not yet be any contact with the contours 2 ', 3'. This path can be driven in rapid traverse.
  • the abrasive discs 6, 7 strike the contours 2 ', 3' at points P 2 and P2 ', respectively.
  • the distance from P 1 to P 2 is a; the distance from Pi on the left side of Fig. 1 to P 2 'is a'. a and a 'are different.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Description

Die Erfindung betrifft ein 'Verfahren zum Schleifen planparalleler Kreisringflächen an scheibenförmigen Werkstücken, insbesondere an Bremsscheiben von Kraftfahrzeugscheibenbremsen, bei dem die Werkstücke auf ihren zu bearbeitenden Flächen, bezogen auf deren Soll-Lage unterschiedliche Schleifzugaben aufweisen, von beiden Seiten mit Seitenschleifscheiben bearbeitet werden und die Bearbeitung in mehreren Phasen mit unterschiedlicher Vorschubgeschwindigkeit erfolgt.The invention relates to a 'method for grinding plane-parallel annular surfaces on disc-shaped workpieces, in particular on brake disks of motor vehicle disc brakes, in which the workpieces are machined from both sides with side grinding disks on their surfaces to be machined, based on their desired position, and the machining takes place in several phases with different feed rates.

Ein derartiges Verfahren ist aus der DE-B 2 122 798 bekannt. Dabei werden die Schleifscheiben beim Abschalten des Vorschubes in ihren Stellungen blockiert und das Werkstück ausgefeuert. Durch Wiederholung dierser Arbeitsschritte mit gleichem oder reduziertem Vorschub wird das Werkstück bis zum Fertigmaß abgeschliffen. Dabei ist es bekannt, das Werkstück derart vorzuschleifen, daß sich auf beiden Seiten gleiche Aufmaße, bezogen auf die Soll-Lage der Flächen, ergeben. Dieses Vorschleifen (aaO Spalte 3, Z. 26) erfolgt bei gleichen Vorschubgeschwindigkeiten, jedoch unterschiedlichen Schleifzugaben also ggf. mit unterschiedlicher Dauer. Es ist also möglich, daß die eine Scheibe noch schleift, während die andere schon anhält, weil die Schleifzugabe auf deren Seite bereits abgearbeitet ist. Eine elastische Verformung kann also nicht ausgeschlossen werden. Die weitere Bearbeitung erfolgt schrittweise nach dem Stop-and-Go-Verfahren, jeweils unter Zwischenschalten des Ausfeuerns. Dies schließt jedoch ein Rückfedern der im ersten Bearbeitungsschritt elastisch verformten Oberflächen und damit gewisse Ungenauigkeiten nicht aus Außerdem ist das mehrfache Anhalten und Ausfeuern zeitraubend und schließt nicht aus, daß bei Wiederbeginn des Vorschubs kurzfristig beidseitig unterschiedliche Anpressdrücke auftreten. Sie können zu elastischer Verformung des Werkstücks führen, die nach Wegnahme des Anpressdruckes zu einer Rückfederung in den Ausgangszustand und damit zu Ungenauigkeiten führen kann.Such a method is known from DE-B 2 122 798. The grinding wheels are blocked in their positions when the feed is switched off and the workpiece is fired. By repeating these steps with the same or reduced feed, the workpiece is ground down to the finished size. It is known to pre-grind the workpiece in such a way that the same dimensions, based on the desired position of the surfaces, result on both sides. This pre-grinding (loc. Column 3, line 26) takes place at the same feed speeds, but with different grinding allowances, that is, with a different duration if necessary. So it is possible that one wheel is still grinding while the other is already stopping because the grinding allowance on its side has already been processed. An elastic deformation cannot be ruled out. Further processing is carried out step by step according to the stop-and-go procedure, with the sparking in between. However, this does not preclude springing back of the elastically deformed surfaces in the first machining step and thus certain inaccuracies. In addition, the repeated stopping and firing is time-consuming and does not rule out that different contact pressures occur briefly on both sides when the feed starts again. They can lead to elastic deformation of the workpiece which, after the contact pressure has been removed, can lead to springing back into the initial state and thus to inaccuracies.

Aufgabe der vorliegenden Erfindung ist es, demgegenüber, das Verfahren der eingangs genannten Art derart zu verbessern, daß die Genauigkeit der Planparallelität dadurch weiter erhöht wird, daß beim Abarbeiten unterschiedlich dicker Schleifzugaben zu deren beiden Seiten elastische Verformungen der Werkstücke vermieden werden, und zwar insbesondere in der Endphase. Das Verfahren soll ferner im Ablauf einfacher und schneller sein.The object of the present invention is, in contrast, to improve the method of the type mentioned in such a way that the accuracy of the plane parallelism is further increased by the fact that when working with grinding thicknesses of different thicknesses, elastic deformations of the workpieces are avoided on both sides, in particular in the final phase. The procedure should also be simpler and faster in the process.

Diese Aufgabe ist dadurch gelöst, daß dann, wenn der gesamte Bearbeitungsvorgang so weit fortgeschritten ist, daß sich beide Schleifscheiben mit dem Werkstück im Kontakt befinden, in der folgenden Phase die Bearbeitung bis zu einem gewählten Zwischenpunkt, in dem das Werkstück - bezogen auf die Soll-Lage der bearbeitenden Fläche - beidseitig eine gleich große Restschleifzugabe aufweist, mit unterschiedlichen Vorschubgeschwindigkeiten erfolgt, die derart abgestimmt sind, daß der Zwischenpunkt auf beiden Seiten im selben Zeitpunkt erreicht wird und danach der Abtrag beidseitig mit gleicher und erhöhter Vorschubgeschwindigkeit erfolgt.This object is achieved in that when the entire machining process has progressed so far that both grinding wheels are in contact with the workpiece, the machining in the following phase to a selected intermediate point at which the workpiece - in relation to the target -Location of the working surface - has the same grinding grinding allowance on both sides, with different feed speeds, which are coordinated in such a way that the intermediate point is reached on both sides at the same time and then the removal is carried out on both sides with the same and increased feed speed.

Vorteilhafte Weiterbildungen sind in den Unteransprüchen definiert.Advantageous further developments are defined in the subclaims.

Es wird also bis zu einer beidseitig des Werkstücks gleichen Schleifzugabe (so) mit unterschiedlichen Vorschubgeschwindigkeiten gearbeitet, die so aufeinander abgestimmt sind, daß man im selben Zeitpunkt von beiden Seiten einen Zwischenpunkt erreicht, der beidseitig des Werkstücks eine gleich große Restschleifzugabe aufweist. Von dort an wird beidseitig mit gleichen Geschwindigkeiten kontinuierlich bis zum gewünschten Fertigmaß geschliffen. Das "Schruppen", d.h. das Abarbeiten des . größten Teils der Schleifzugabe, die insgesamt abzuarbeiten ist, erfolgt erst, wenn die unterschiedlichen Aufmaße auf beiden Seiten und die Formfehler unter Aufwendung nicht zu großer Schleifkräfte besitigt sind. Damit ist absolut sichergestellt, daß keine elastischen Verformungen des Werkstücks durch unterschiedliche Anpressdrücke der Schleifscheiben auftreten können.It is therefore worked up to a grinding allowance (s o ) which is the same on both sides of the workpiece, with different feed speeds which are coordinated with one another in such a way that an intermediate point is reached from both sides at the same time which has an equal residual grinding allowance on both sides of the workpiece. From there, grinding is carried out continuously on both sides at the same speeds to the desired finished size. The "roughing", ie the processing of the. Most of the grinding allowance, which must be worked off as a whole, only takes place when the different oversizes on both sides and the defects in shape have been eliminated using excessive grinding forces. This ensures absolutely that no elastic deformations of the workpiece can occur due to different contact pressures of the grinding wheels.

Ein Ausführungsbeispiel der Erfindung ist im folgenden unter Bezugnahme auf die beigefügten Zeichnungen näher beschrieben und es stellen dar:

  • Figur 1 eine schematische Darstellung der Bearbeitung einer Bremsscheibe;
  • Figur 2 ein Weg- bzw. Geschwindigkeits-Zeitdiagramm bei der Bearbeitung nach Fig. 1
An embodiment of the invention is described below with reference to the accompanying drawings and illustrate:
  • Figure 1 is a schematic representation of the processing of a brake disc;
  • FIG. 2 shows a path or speed-time diagram in the processing according to FIG. 1

Figur 1 zeigt als Werkstück eine Bremsscheibe 1. Ihre beiden im Abstand h verlaufenden Seitenflächen 2 und 3 sollen so bearbeitet werden, daß sie in hohem Maße eben, zueinander exakt parallel und exakt rechwinklig zur Drehachse A sind. Die Kontur der Bremsscheibe 1 vor dem Schleifen ist extrem übertrieben dargestellt und mit 2' bzw. 3' bezeichnet. Diese überstehende Kontur 2', 3' muß bis zur in dicker Linie eingezeichneten Soll-Lage der Seitenflächen 2, 3 abgearbeitet werden. Während des Schleifens soll keine elastische Verformung durch unterschiedliches Andrücken der Schleifwerkzeuge auftreten, die nach Wegnahme des Anpreßdruckes, ein Rückfedern in die Ausgangslage und dann eine bleibende Unebenheit oder Ungenauigkeit in der Planparallelität ergeben würde.FIG. 1 shows a brake disc 1 as a workpiece. Its two side surfaces 2 and 3, which run at a distance h, are to be machined so that they are to a large extent flat, exactly parallel to one another and exactly perpendicular to the axis of rotation A. The contour of the brake disc 1 before grinding is shown extremely exaggerated and designated 2 'or 3'. This protruding contour 2 ', 3' must be machined to the desired position of the side surfaces 2, 3 shown in a thick line. During grinding, no elastic deformation should occur due to different pressing of the grinding tools, which would result in springing back into the starting position after removal of the contact pressure and then permanent unevenness or inaccuracy in the plane parallelism.

Zur Bearbeitung wird die Bremsscheibe 1 zwischen Spannbacken 4 und 5 aufgenommen und um die Drehachse A gedreht. Die Seitenflächen 2, 3 werden mit Seitenschleifscheiben 6, 7 bearbeitet, die sich drehen und in Richtung der eingezeichneten Pfeile auf die Seitenflächen 2, 3 bzw. deren Konturen 2', 3' vorgeschoben werden.For processing, the brake disc 1 is received between the jaws 4 and 5 and rotated about the axis of rotation A. The side surfaces 2, 3 are processed with side grinding wheels 6, 7, which rotate and are advanced in the direction of the arrows drawn onto the side surfaces 2, 3 or their contours 2 ', 3'.

In der in Fig. 1 dargestellten Position befinden sich die Schleifscheiben 6, 7 in Vorschubrichtung an den Punkten Pi. Ausgehend von diesen Punkten Pi soll von beiden Schleifscheiben 6, 7 eine Länge 1 bis zum Fertigmaß (= Soll-Lage der Seitenflächen 2, 3 wie eingezeichnet) abgearbeitet werden.In the position shown in FIG. 1, the grinding wheels 6, 7 are located in the feed direction at the points Pi. Starting from these points Pi, a length 1 of the two grinding wheels 6, 7 is to the finished dimension (= desired position of the side surfaces 2, 3 as shown) are processed.

In Figur 2 bezeichnet die Ordinate der Weg s beider Schleifscheiben 6, 7 in Vorschubrichtung und die Geschwindigkeit v beider Schleifscheiben 6, 7 in Vorschubrichtung in Abhängigkeit von der Zeit die auf der Abszisse eingezeichnet ist. Die Vorschubgeschwindigkeiten der beiden Schleifscheiben 6, 7 sind mit v1, v2, v3 bzw. v3', v4, v5, v6 bezeichnet. Die Vorschubgeschwindigkeiten sind für beide Schleifscheiben 6,7 bis zum Zeitpunkt t2 gleich; sie sind ferner von t3 bis zum Schluß der Bearbeitung bei t6 jeweils gleich; sie sind jedoch zwischen t2 und t3 unterschiedlich, nämlich v3 bzw. v3'.In FIG. 2, the ordinate denotes the path s of both grinding wheels 6, 7 in the feed direction and the speed v of both grinding wheels 6, 7 in the feed direction as a function of the time which is shown on the abscissa. The feed speeds of the two grinding wheels 6, 7 are designated v1, v2, v3 and v3 ', v4, v5, v6. The feed speeds are the same for both grinding wheels 6,7 up to time t2; they are also the same from t3 to the end of processing at t6; however, they differ between t2 and t3, namely v3 and v3 '.

Die vom Ursprung des Diagramms nach Fig. 2 ausgehende Linie zeigt den Weg s in Abhängigkeit von der Zeit t. Der Weg von P1 bis P6 entspricht dem Abstand 1, der auch in Fig. 1 eingezeichnet ist.The line starting from the origin of the diagram in FIG. 2 shows the path s as a function of the time t. The path from P1 to P6 corresponds to the distance 1, which is also shown in FIG. 1.

Die Schleifscheiben 6, 7 fahren zunächst aus einer in Fig. 1 nicht dargestellten Ausgangslage mit gleicher Geschwindigkeit vi in die Ausgangslage P1, die sie im Zeitpunkt t1 erreichen. In P1 darf sich noch kein Kontakt mit den Konturen 2', 3' ergeben. Dieser Weg kann im Eilgang gefahren werden.The grinding wheels 6, 7 first move from an initial position (not shown in FIG. 1) at the same speed vi to the initial position P 1 , which they reach at time t 1 . In P 1 there must not yet be any contact with the contours 2 ', 3'. This path can be driven in rapid traverse.

Von P1 an erfolgt der Vorschub mit der geringeren Geschwindigkeit v2, und zwar von beiden Seiten gleich solange bis bei P2 im Zeitpunkt t2 der erste punktuelle Kontakt der Schleifscheibe 6 mit der Kontur 2' stattfindet. Ein solcher punktueller Kontakt kann dadurch bedingt sein, daß die bearbeitete Fläche schräg liegt, d.h. einen sog. Planschlag hat. Sie kann aber auch daher herrühren, daß die Oberfläche praktisch kleine Wellen in Umfangsrichtung, also "Hügel" und "Täler" aufweist. Ein solcher punktueller Kontakt wird einfach dadurch festgestellt, daß man den Cosinus phi, d.h. den Winkel zwischen Spannung und Strom im Antriebsmotor der Schleifscheiben 6, 7 mißt. Der Cosinus phi ist lastabhängig und gibt ein hervorragend sensibles Maß für das Auftreffen der Schleifscheiben 6, 7 auf das Werkstück 1.From P 1 onwards the feed takes place at the lower speed v 2 , namely from both sides until the first point contact of the grinding wheel 6 with the contour 2 'takes place at P 2 at time t 2 . Such a point contact can be caused by the fact that the machined surface lies at an angle, that is, has a so-called flat lay. But it can also result from the fact that the surface has practically small waves in the circumferential direction, that is to say "hills" and "valleys". Such a point contact is established simply by measuring the cosine phi, ie the angle between voltage and current in the drive motor of the grinding wheels 6, 7. The cosine phi is load-dependent and gives an outstandingly sensitive measure for the impact of the grinding wheels 6, 7 on the workpiece 1.

Das Auftreffen der Schleifscheiben 6, 7 auf die Konturen 2', 3' erfolgt an den Punkten P2 bzw. P2'. Der Abstand von P1 zu P2 beträgt a; der Abstand von Pi auf der linken Seite von Fig. 1 zu P2' beträgt a' . a und a' sind verschieden.The abrasive discs 6, 7 strike the contours 2 ', 3' at points P 2 and P2 ', respectively. The distance from P 1 to P 2 is a; the distance from Pi on the left side of Fig. 1 to P 2 'is a'. a and a 'are different.

Jeweils im Augenblick des Kontaktes der Schleifscheiben 6, 7 mit den Konturen 2' bzw. 3', also in den Punkten P2 bzw. P2' ändert sich die Vorschubgeschwindigkeit wiederum. Sie wird vermindert, sobald Kontakt gegeben ist, also zu den Zeitpunkten t2 bzw. t2'. Es erfolgt eine Umstellung der Vorschubgeschwindigkeit auf v3 bzw. v3'. Sie ist für beide Schleifscheiben 6, 7 unterschiedlich. Sie ist für die Schleifscheibe 6, die zuerst im Zeitpunkt t2 im Punkt P2 auf die Kontur 2' trifft, vs. Sie ist für die Schleifscheibe 7, die als zweite im Zeitpunkt t2' im Punkt P2' auf die Kontur 3' trifft, v3'. Die Bearbeitung erfolgt jetzt auf beiden Seiten über unterschiedliche Strecken, nämlich auf der rechten Seite in Fig. 1 von P2 bis P3 über die Strecke b und auf der linken Seite in Fig. 1 von P2' bis Ps über die Strecke b'. Die Länge dieser Strecken b, b' ist so bestimmt, daß dann, wenn beidseitig die Punkte P3 ereicht sind, die beidseitig verbleibende Restschleifzugabe so, die bis zum Fertigmaß noch abgearbeitet werden muß, gleich groß ist. Das ist der Fall, wenn in dieser Phase die Schleifzugaben b und b' so bestimmt werden, daß a'+b' = a+b ist.Each time the grinding wheels 6, 7 come into contact with the contours 2 'or 3', ie at points P 2 or P 2 ' , the feed speed changes again. It is reduced as soon as contact is made, ie at times t 2 and t2 '. The feed rate is changed to v 3 or v 3 '. It is different for both grinding wheels 6, 7. It is true of the grinding wheel 6, the first at time t 2 at the point P 2 on the contour 2 'vs. It is v 3 'for the grinding wheel 7, which second meets the contour 3' at the point P 2 'at the point t 2 '. The processing now takes place on both sides over different distances, namely on the right side in FIG. 1 from P 2 to P 3 over the distance b and on the left side in FIG. 1 from P 2 'to Ps over the distance b' . The length of these sections b, b 'is determined such that when the points P 3 are reached on both sides, the remaining grinding allowance remaining on both sides, which still has to be worked through to the finished dimension, is of the same size. This is the case if the grinding allowances b and b 'are determined in this phase such that a' + b '= a + b.

Liegen b und b' fest, so muß v3 : v3' = b : b' gelten, damit die Restschleifzugabe so (Punkt Pa) von beiden Seiten zum selben Zeitpuntk t3 erreicht wird.If b and b 'are fixed, then v 3 : v 3 ' = b: b 'must apply so that the remaining grinding allowance (point Pa) is reached from both sides at the same time t 3 .

Sind nun die Punkte P3 von beiden Seiten her erreicht, so daß die noch bis zum Fertigmaß (Soll-Lage) der Seitenflächen 2, 3 abzuarbeitende Restschleifzugabe so beidseitig gleich ist, so ist von dieser Stelle an nunmehr bei exakt gleichen Vorschubgeschwindigkeiten und daher auch gleichen Anpressdrücken von beiden Seiten her sichergestellt, daß auch das Fertigmaß schließlich von beiden Seiten her exakt im selben Zeitpunkt, nämlich zum Zeitpunkt te erreicht wird und jegliche elastische Verformungen der Bremsscheibe 1 während der Bearbeitung ausgeschlossen werden können.If the points P 3 are now reached from both sides, so that the remaining grinding allowance s o to be finished up to the finished dimension (desired position) of the side surfaces 2, 3 is the same on both sides, then from this point on it is now at exactly the same feed speeds and therefore also the same contact pressure from both sides ensures that the finished dimension is finally reached from both sides at exactly the same time, namely at time te and any elastic deformation of the brake disc 1 can be excluded during processing.

Von P3 an wird zunächst mit voller Leistung und höchstmöglicher, im Vergleich mit v3 bzw. v3' wieder erhöhter Vorschubgeschwindigkeit v4 geschruppt und nach Erreichen des Punktes P4 nach Abarbeitung des Schleifaufmaßanteils c und im Zeitpunkt t4 erneut umgeschaltet, und zwar auf die verringerte Schlichtgeschwindigkeit vs, die auch wieder für beide Schleifscheiben 6, 7 gleich ist. Mit ihr erfolgt eine Abarbeitung des Schleifaufmaßanteils d bis zum Punkt P5 im Zeitpunkt t5. Schließlich erfolgt vom Punkt P5 bis zum Punkt P6 das sog. Ausfeuern über eine Strecke e bis zum Zeitpunkt t6.From P 3 onwards, roughing is carried out with full power and the highest possible feed speed v 4 compared to v 3 or v 3 ', and after reaching point P4 after processing the grinding allowance c and at time t4, the switch is made again to that reduced finishing speed vs, which is again the same for both grinding wheels 6, 7. It is used to process the grinding allowance portion d up to point P 5 at time t 5 . Finally, from point P 5 to point P 6, the so-called firing takes place over a distance e up to time t 6 .

Claims (3)

1. Process for grinding plane-parallel circular ring surfaces on disc-shaped work pieces, especially on brake discs for lorry disc brakes, in which the work pieces receive different amounts of grinding on their working surfaces with reference to their precalculated position, which are machined from both sides with lateral abrasive discs with the machining taking place in several phases at differing rates of advance, characterised by the fact that when the whole machining process has reached the stage that both abrasive discs (6; 7) are in contact with the work piece (1), the machining in the subsequent phase takes place at differing rates of advance (V3; V3') until a selected interim point (P3) at which the work piece has an equal amount remaining to be ground off on both sides (so) - with reference to the pre-calculated position of the surfaces to be machined (2; 3) - these rates of advance are harmo- nised in such a way that the interim point (P3) is reached at the same time point (T3) on both sides, after which the material is removed on both sides at an increased and equal rate of adcance (V4).
2. Process in accordance with claim 1 characterised by the fact that the ratio V3: Va' of the above- mentioned differing rates of advance (V3; V3') is equal to the ratio b:b'e of the distances b:b' of the abrasive discs (6; 7) from the interim point (P3) at the point (P2; P2') of their first contact with the unmachined contour (2'; 3') of the surface to be machined (2; 3).
3. Process in accordance with claim 1 or 2 characterised by the fact that the time point of the contact of an abrasive disc (6; 7) with the unmachined contour (2'; 3') of the surfaces to be machined (2; 3) is defined by measurement of the change in a dimension (cos phi) corresponding to the phase angle (phi) between the current and the voltage of the drive motors.
EP87114773A 1986-12-11 1987-10-09 Method for grinding plane-parallel annular surfaces of disk-shaped workpieces Expired - Lifetime EP0270769B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3642304A DE3642304C1 (en) 1986-12-11 1986-12-11 Process for grinding plane-parallel circular surfaces on disc-shaped workpieces
DE3642304 1986-12-11

Publications (2)

Publication Number Publication Date
EP0270769A1 EP0270769A1 (en) 1988-06-15
EP0270769B1 true EP0270769B1 (en) 1990-04-11

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EP87114773A Expired - Lifetime EP0270769B1 (en) 1986-12-11 1987-10-09 Method for grinding plane-parallel annular surfaces of disk-shaped workpieces

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US (1) US4827677A (en)
EP (1) EP0270769B1 (en)
DE (1) DE3642304C1 (en)

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US5056266A (en) * 1990-01-04 1991-10-15 Norris Bobby D Rotary brake rotor resurfacer
DE4124772A1 (en) * 1991-07-26 1993-01-28 Nagel Masch Werkzeug Surface grinding of two parallel surfaces esp. vehicle brake discs - using fine final finishing phase after partial retraction of tools to receive stress
DE4328985C2 (en) * 1993-08-28 1995-12-07 Thielenhaus Ernst Kg Machine for fine grinding of pre-machined, ring-shaped metal workpieces
US5915502A (en) * 1997-02-27 1999-06-29 Varga North America, Inc. Brake disc assembly and a method for fabricating brake disc
US6296553B1 (en) * 1997-04-02 2001-10-02 Nippei Toyama Corporation Grinding method, surface grinder, workpiece support, mechanism and work rest
JP2004066392A (en) * 2002-08-06 2004-03-04 Daisho Seiki Kk Grinding method of vertical type double-head surface grinding machine for machining brake disk
US7484443B2 (en) * 2003-10-24 2009-02-03 Delphi Technologies, Inc. Precision turning process for hatted brake rotor
US7435158B2 (en) * 2004-12-10 2008-10-14 Daisho Seiki Corporation Initial position setting method of grinding wheel in vertical double disc surface grinding machine
US7785173B2 (en) * 2005-07-05 2010-08-31 Supfina Machine Co. Superfinishing machine and method
CN113977363B (en) * 2021-11-22 2023-09-22 中国航发贵州黎阳航空动力有限公司 Processing method of high-precision planeness and high-grade roughness plane

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US3721046A (en) * 1970-07-02 1973-03-20 Litton Industries Inc Horizontal disc grinder with equal feed control from workpiece contact
SU375171A1 (en) * 1970-09-21 1973-03-23 VIB.PIOTE? 1A
DE2122798B2 (en) * 1971-05-08 1974-07-04 Maschinenfabrik Ernst Thielenhaus, 5600 Wuppertal Method for producing a flat workpiece of a certain thickness, in particular brake disks for motor vehicle disk brakes
DE2518503A1 (en) * 1974-05-10 1975-11-20 Seiko Seiki Kk GRINDING PROCESS AND EQUIPMENT FOR ITS IMPLEMENTATION
JPS54125590A (en) * 1978-03-22 1979-09-29 Ntn Toyo Bearing Co Ltd Grinding control method in complex grinding
US4524547A (en) * 1983-09-06 1985-06-25 Litton Industrial Products, Inc. Automatic double disc grinder control cycle
US4545153A (en) * 1983-12-12 1985-10-08 Charlton Associates Force sensor for controlling polishing pad pressure
US4586296A (en) * 1984-07-03 1986-05-06 Charlton Associates Method of finishing the surface of a disc

Also Published As

Publication number Publication date
EP0270769A1 (en) 1988-06-15
DE3642304C1 (en) 1988-01-21
US4827677A (en) 1989-05-09

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