EP0074518A2 - Precision grinding machine, in particular projection form grinding machine - Google Patents

Precision grinding machine, in particular projection form grinding machine Download PDF

Info

Publication number
EP0074518A2
EP0074518A2 EP82107665A EP82107665A EP0074518A2 EP 0074518 A2 EP0074518 A2 EP 0074518A2 EP 82107665 A EP82107665 A EP 82107665A EP 82107665 A EP82107665 A EP 82107665A EP 0074518 A2 EP0074518 A2 EP 0074518A2
Authority
EP
European Patent Office
Prior art keywords
grinding wheel
grinding
grinding machine
dressing
dressing body
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
EP82107665A
Other languages
German (de)
French (fr)
Other versions
EP0074518B2 (en
EP0074518A3 (en
EP0074518B1 (en
Inventor
Alfred Dipl.-Ing. Kolb
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.)
WERKZEUGMASCHINENBAU PRAEZISIONS-TECHNIK GMBH
Original Assignee
Werkzeugmaschinenbau Prazisions-Technik 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6141500&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0074518(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Werkzeugmaschinenbau Prazisions-Technik GmbH filed Critical Werkzeugmaschinenbau Prazisions-Technik GmbH
Publication of EP0074518A2 publication Critical patent/EP0074518A2/en
Publication of EP0074518A3 publication Critical patent/EP0074518A3/en
Application granted granted Critical
Publication of EP0074518B1 publication Critical patent/EP0074518B1/en
Publication of EP0074518B2 publication Critical patent/EP0074518B2/en
Expired legal-status Critical Current

Links

Images

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
    • 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
    • B24B17/00—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor
    • B24B17/04—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving optical auxiliary means, e.g. optical projection form grinding machines

Definitions

  • the invention relates to a precision grinding machine, in particular a projection shape grinding machine, with a grinding wheel processing a workpiece, as specified in the preamble of claim 1.
  • a grinding machine is e.g. known from German patent specification 473 868.
  • the contour of the machined workpiece can be observed on a projection screen and the grinding wheel corresponding to this contour can be guided by hand along a nominal shape line. Wear of the grinding wheel during operation can be easily corrected visually.
  • the object of the invention is to considerably simplify the dressing process in a precision grinding machine, in particular in a projection form grinding machine, and in particular to design it in such a way that dressing is possible during the normal machining process.
  • the grinding wheel comes into contact with the complementary profile groove over its entire cross section, that is to say the grinding wheel is simultaneously dressed to the desired dimension over its entire active surface.
  • the wear of the dressing tool is considerably less than when dressing with a single-grain diamond.
  • the dressing process can be carried out practically during normal operation, since the dressing body can engage at a point different from the point of engagement between the grinding wheel and the tool, for example opposite the point of engagement.
  • the feed movement of the dressing body can be controlled by the CNC control of the grinding machine, and the CNC control changes the distance between the grinding wheel and the workpiece to be machined in accordance with the respective position of the dressing body relative to the grinding wheel.
  • the size of the infeed movement of the dressing body has a measure of the distance between the dressing body and the grinding wheel and thus a measure of the instantaneous shape of the grinding wheel.
  • This measure can therefore be used directly by the control to adjust the relative distance between the grinding wheel and the tool accordingly, so that Unge Accuracies that can be attributed to the abrasion of the grinding wheel can be continuously compensated for during operation. It is sufficient to feed the dressing body to the extent that wear of the grinding wheel is to be expected. You get absolute security if you choose the infeed movement - or the time interval between successive infeed movements - in such a way that the dressing body always removes a little more material from the grinding wheel than can be expected from natural abrasion when machining the workpiece.
  • the dressing device does not have to be in contact with the grinding wheel during the entire operating process; it is sufficient if the dressing body is moved to the grinding wheel at certain time intervals for dressing and then withdrawing it again.
  • the profile groove in the dressing body runs parallel to the grinding wheel stroke in the case of a grinding wheel performing a reciprocating stroke movement, and in particular if the profile groove extends over the entire length of the dressing body and is open on its end faces. This is because the lifting movement of the grinding wheel can then be used to guide the grinding wheel over the entire length of the profile groove in the dressing body, so that the grinding wheel is ground successively from different areas of the profile groove. This significantly reduces the wear of the dressing body. This process can also be easily carried out in normal operation.
  • the dressing body has a plurality of profile grooves of different cross-sectional shape next to one another and is displaceable transversely to its feed direction. With this shift, a certain profile groove can be aligned with the grinding wheel, on the other hand, the preferred embodiment makes it possible to provide the grinding wheel with different profiles, since the profile groove dressing the grinding wheel can be replaced by the transverse displacement of the dressing body.
  • the projection shape grinding machine shown in FIG. 1 has a cross table 1 with slides 2, 3 which can be moved perpendicular to one another and which can be displaced by means of servomotors 4 and 5, respectively.
  • the upper carriage 3 (FIG. 2) carries a holder 6 for a grinding wheel 7.
  • the holder 6 is displaceable in the vertical direction on a carrier 8 placed on the upper carriage 3, so that the grinding wheel can be moved up and down during operation, such as this is represented by the arrow 9 in Fig. 2.
  • the workpiece 11 to be machined is fastened on a further cross table 10 (FIG. 1). It can be advanced by means of the cross table 10 into a processing position in which the grinding wheel can be brought into engagement with the workpiece.
  • the point of intervention can be shown enlarged on a projection screen 12.
  • a light source 13 illuminating the point of engagement, a projection objective 14 and deflecting mirrors 15 and 16 are provided.
  • a silhouette 18 of the grinding wheel 7 and a silhouette 19 of the workpiece 11 are depicted on the projection screen.
  • a transparent support, which contains the target shape curve, is normally placed on the projection screen 12, so that the actual shape of the workpiece can be compared directly with the target shape.
  • the grinding wheel is controlled so that it grinds a contour that corresponds to the target shape into the workpiece. This can be done manually, for this purpose handwheels 20 and 21 are provided which move the slides 2 and 3 of the cross table 1 in one direction.
  • control will normally take place by means of a CNC control 22, which controls the servomotors 4 and 5 accordingly.
  • a dressing device 23 is also held on the carrier 8 and comprises a holder 24 that can be advanced in the direction of the grinding wheel 7.
  • the feed movement of the holder can be carried out manually or by means of a servomotor 25, which can also be controlled by the CNC control 22.
  • the holder 24 At its end facing the grinding wheel, the holder 24 carries a dressing body 26, the design of which is explained below in particular with reference to FIGS. 3 and 4.
  • the dressing body 26 has on its side facing the grinding wheel a profile groove 27 which is open towards the grinding wheel and which extends in the exemplary embodiment shown over the entire length of the dressing body 26 and is open on the end faces.
  • the surface of the profile groove 27 is designed as a grinding surface, for example by coating with diamonds.
  • the cross-sectional shape is complementary to the desired grinding wheel profile.
  • the dressing body shown in Figure 3 has only a single profile groove 27, this dressing body can be attached to the holder 24 by means of an extension 28 on its rear side.
  • the longitudinal direction of the profile grooves 27 is arranged parallel to the direction of the oscillating stroke movement of the grinding wheel 7. If, on the other hand, the grinding wheel does not perform a lifting movement but maintains a constant height, the direction of the profile grooves coincides with the direction of the tangent to the point of the grinding wheel closest to the dressing body 26.
  • the holder 24 with the dressing body 26 is pushed onto the grinding wheel 7 until the grinding wheel comes into contact with the grinding surfaces of the profile groove 27, so that the grinding wheel is dressed.
  • the profile of the grinding wheel results from the profile of the respective profile groove.
  • the grinding process does not always take place at the same point on the profile groove, but moves along the profile groove depending on the instantaneous position of the grinding wheel. This results in a significantly reduced wear of the grinding surface of the profile groove.
  • the dressing device can be brought out of engagement with the grinding wheel again by pushing back the holder 24.
  • the dressing body shown in FIG. 4 can be used to provide grinding wheels with different profiles; it suffices to move the dressing body 26 transversely to the grinding wheel plane.
  • the infeed movement of the dressing device 23 takes place via the servomotor 25 controlled by the CNC control.
  • This infeed can take place continuously or at time intervals during normal grinding operation.
  • the size of the infeed or the time interval between infeeds depends on the natural abrasion of the grinding wheel during normal grinding operations.
  • the CNC control Since the feed movement is controlled by the CNC control via the servomotor 25 and since the respective shape of the grinding wheel adjusts itself according to the position of the dressing device 23, the CNC control has a signal which corresponds to the respective grinding wheel size. This signal can be used to adjust the relative distance between the grinding wheel and the workpiece in accordance with the respective grinding wheel size, for example by actuating the servomotor 4. In this way it is ensured during the entire operation that the respective abrasion of the grinding wheel is taken into account, incorrect mass due to wear of the This virtually eliminates the grinding wheel.
  • Dressing the grinding wheel is also in no way time-consuming, since it can take place during normal operation; an interruption is not necessary.
  • the grinding wheel can be dressed with different profiles that result from the respective cross-sectional shape of the profile grooves 27.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

1. Precision grinding machine, more particularly a projection contour grinding machine, having a grinding wheel (7) which machines a workpiece, a dresser body (26), which is provided with at least one profiled groove, which groove extends tangentially with respect to the grinding wheel and is open in the direction towards the grinding wheel, the surface of the said groove being formed as a grinding surface, and the cross-section thereof complementing the required grinding wheel profile, and a numerical control for controlling the relative movement of the grinding wheel and the workpiece and for the automatic dressing of the grinding wheel by means of the dresser body, characterised in that for dressing the grinding wheel (7), the dresser body (26) can be advanced in the plane of the grinding wheel (7) towards the grinding wheel (7), the advance movement of the dresser body can be controlled by means of the numerical control (22), and the numerical control (22) alters the distance between the grinding wheel (7) and the workpiece (11) to be machined according to the respective position of the dresser body (26) relative to the grinding wheel (7).

Description

Die Erfindung betrifft eine Präzisionsschleifmaschine, insbesondere eine Projektionsformenschleifmaschine, mit einer ein Werkstück bearbeitenden Schleifscheibe wie sie im Oberbegriff des Anspruchs 1 angegeben ist. Eine solche Schleifmaschine ist z.B. aus der deutschen Patentschrift 473 868 bekannt.The invention relates to a precision grinding machine, in particular a projection shape grinding machine, with a grinding wheel processing a workpiece, as specified in the preamble of claim 1. Such a grinding machine is e.g. known from German patent specification 473 868.

Bei Projektions-Formenschleifmaschinen kann man die Kontur des bearbeiteten Werkstückes an einem Projektionsschirm beobachten und die Schleifscheibe entsprechend dieser Kontur von Hand entlang einer Sollformlinie führen. Eine Abnutzung der Schleifscheibe während des Betriebes lässt sich dabei visuell ohne weiteres korrigieren.In the case of projection form grinding machines, the contour of the machined workpiece can be observed on a projection screen and the grinding wheel corresponding to this contour can be guided by hand along a nominal shape line. Wear of the grinding wheel during operation can be easily corrected visually.

Schwierigkeiten ergeben sich jedoch bei der Verwendung anderer Schleifmaschinen und insbesondere bei der Verwendung automatisch gesteuerter Schleifmaschinen. Jede Veränderung der Schleifscheibenkontur führt dann zwangsläufig zu Fehlern, denn die Dimensionsänderung der Schleifscheibe im Betrieb lässt sich in der Steuerung nicht mit der erforderlichen Sicherheit programmieren.Difficulties arise, however, when using other grinding machines and especially when using automatically controlled grinding machines. Any change in the grinding wheel contour will inevitably lead to errors because the dimensional change of the grinding wheel during operation cannot be programmed in the control with the required security.

Es ist bekannt, die Schleifscheibe nach einem Arbeitsgang mittels eines Abrichtwerkzeuges zu regenerieren, d.h. auf die gewünschte Querschnittsform zu bringen. Zu diesem Zweck wird bei bekannten Vorrichtungen ein Abziehapparat mit einem eingesetzten Diamant mit Hilfe eines Schlittens oder eines Schwenkhebels von Hand so bewegt, dass die Schleifscheibe das gewünschte Profil erhält. Die Bewegung des Einkorndiamanten lässt sich auch elektromotorisch oder hydraulisch durchführen.It is known to regenerate the grinding wheel after one operation using a dressing tool, i.e. to bring to the desired cross-sectional shape. For this purpose, in known devices, a puller with an inserted diamond is moved by hand with the aid of a slide or a swivel lever so that the grinding wheel is given the desired profile. The movement of the single-grain diamond can also be carried out by an electric motor or hydraulically.

Es ist auch bereits bekannt, elektromotorisch oder hydraulisch angetriebene Abziehvorrichtungen auf den Werkzeugträgerschlitten aufzubauen. Dabei muss bei CNC-gesteuerten Maschinen zum Einbringen der Schleifscheibe in die Abrichtposition der Werkstückträgerschlitten verfahren werden (DE-OS 2 452 396).It is also known to build pulling devices driven by an electric motor or hydraulically on the tool carrier slide. With CNC-controlled machines, the grinding wheel must be brought into the dressing position of the workpiece carrier slide (DE-OS 2 452 396).

Alle bekannten Abzieheinrichtungen, die mit einem einzigen Diamanten arbeiten, haben den Nachteil einer grossen Abnutzung des Diamanten und damit einer unpräzisen Schleifscheibenkontur.All known pulling devices that work with a single diamond have the disadvantage of a large wear of the diamond and thus an imprecise grinding wheel contour.

Bei Vorrichtungen., bei denen das Abrichtwerkzeug auf dem Werkzeugträgerschlitten aufgebaut wird, muss nach dem Abrichten das Werkstück wieder auf dem Werkzeughalter festgelegt werden, wobei ebenfalls Fehler entstehen können. Schliesslich ist bei bekannten Vorrichtungen das Abrichten der Schleifscheibe ausserordentlich zeitaufwendig, da dazu der Betriebsablauf unterbrochen werden muss.In the case of devices in which the dressing tool is set up on the tool carrier slide, the workpiece must be fixed on the tool holder again after dressing, and errors can also occur. Finally, in known devices, dressing the grinding wheel is extremely time-consuming since the operating sequence must be interrupted for this.

Der Erfindung liegt die Aufgabe zugrunde, bei einer Präzisionsschleifmaschine, insbesondere bei einer Projektions-Formenschleifmaschine, den Abrichtvorgang erheblich zu vereinfachen und insbesondere so auszubilden, dass ein Abrichten während des normalen Bearbeitungsvorganges möglich ist.The object of the invention is to considerably simplify the dressing process in a precision grinding machine, in particular in a projection form grinding machine, and in particular to design it in such a way that dressing is possible during the normal machining process.

Diese Aufgabe wird bei einer Präzisionsschleifmaschine der eingangs beschriebenen Art erfindungsgemäss durch die kennzeichnenden Merkmale des Anspruches 1, gelöst.This object is achieved according to the invention in a precision grinding machine of the type described in the introduction by the characterizing features of claim 1.

Allein durch Zustellung des Abrichtkörpers kommt die Schleifscheibe über ihren gesamten Querschnitt mit der komplementären Profilnut in Berührung, die Schleifscheibe wird also über ihre gesamte aktive Fläche im wesentlichen gleichzeitig auf das gewünschte Mass abgerichtet. Dabei ist die Abnutzung des Abrichtwerkzeuges wesentlich geringer als bei der Abrichtung mit einem Einkorndiamanten. Ausserdem ist es möglich, der Schleifscheibe auch komplizierte Profile zu geben,-die beispielsweise von einer Geraden und einer Kreisform abweichen. Schliesslich ist ein besonderer Vorteil, dass der Abrichtvorgang praktisch während des normalen Betriebes erfolgen kann, da der Abrichtkörper an einer von der Eingriffstelle zwischen Schleifscheibe und Werkzeug verschiedenen Stelle angreifen kann, beispielsweise der Eingriffstelle gegenüberliegend. Die Zustellbewegung des Ahrichtkörpers ist von der CNC-Steuerung der Schleifmaschine steuerbar, und die CNC-Steuerung verändert den Abstand zwischen Schleifscheibe und zu bearbeitendem Werkstück entsprechend der jeweiligen Stellung des Abrichtkörpers relativ zur Schleifscheibe.Simply by infeed of the dressing body, the grinding wheel comes into contact with the complementary profile groove over its entire cross section, that is to say the grinding wheel is simultaneously dressed to the desired dimension over its entire active surface. The wear of the dressing tool is considerably less than when dressing with a single-grain diamond. In addition, it is also possible to give the grinding wheel complex profiles which differ, for example, from a straight line and a circular shape. Finally, it is a particular advantage that the dressing process can be carried out practically during normal operation, since the dressing body can engage at a point different from the point of engagement between the grinding wheel and the tool, for example opposite the point of engagement. The feed movement of the dressing body can be controlled by the CNC control of the grinding machine, and the CNC control changes the distance between the grinding wheel and the workpiece to be machined in accordance with the respective position of the dressing body relative to the grinding wheel.

Wenn die Steuerung die Zustellbewegung des Abrichtkörpers steuert, besitzt sie mit der Grösse der Zustellbewegung des Abrichtkörpers ein Mass für den Abstand zwischen Abrichtkörper und Schleifscheibe und somit ein Mass für die augenblickliche Form der Schleifscheibe. Dieses Mass kann daher von der Steuerung direkt dazu verwendet werden, den Relativabstand zwischen Schleifscheibe und Werkzeug entsprechend zu verstellen, so dass Ungenauigkeiten, die auf den Abrieb der Schleifscheibe zurückzuführen sind, während des Betriebes laufend ausgeglichen werden können. Es genügt dabei, den Abrichtkörper in dem Masse zuzustellen, in dem ein Abrieb der Schleifscheibe zu erwarten ist. Absolute Sicherheit erhält man, wenn man die Zustellbewegung - oder den zeitlichen Abstand zwischen aufeinanderfolgenden Zustellbewegungen - so wählt, dass durch den Abrichtkörper immer ein wenig mehr Material von der Schleifscheibe abgenommen wird, als es durch den natürlichen Abrieb beim Bearbeiten des Werkstückes zu erwarten ist.When the controller controls the infeed movement of the dressing body, the size of the infeed movement of the dressing body has a measure of the distance between the dressing body and the grinding wheel and thus a measure of the instantaneous shape of the grinding wheel. This measure can therefore be used directly by the control to adjust the relative distance between the grinding wheel and the tool accordingly, so that Unge Accuracies that can be attributed to the abrasion of the grinding wheel can be continuously compensated for during operation. It is sufficient to feed the dressing body to the extent that wear of the grinding wheel is to be expected. You get absolute security if you choose the infeed movement - or the time interval between successive infeed movements - in such a way that the dressing body always removes a little more material from the grinding wheel than can be expected from natural abrasion when machining the workpiece.

Dabei muss die Abrichtvorrichtung nicht während des gesamten Betriebsvorganges mit der Schleifscheibe in Berührung sein, es genügt, wenn man den Abrichtkörper in bestimmten Zeitabständen zur Abrichtung der Schleifscheibe an diese heranfährt und sie anschliessend wieder zurückzieht.The dressing device does not have to be in contact with the grinding wheel during the entire operating process; it is sufficient if the dressing body is moved to the grinding wheel at certain time intervals for dressing and then withdrawing it again.

Besonders vorteilhaft ist es, wenn die Profilnut im Abrichtkörper bei einer im Betrieb eine reziprozierende Hubbewegung ausführenden Schleifscheibe parallel zum Schleifscheibenhub verläuft und insbesondere, wenn die Profilnut sich über die gesamte Länge des Abrichtkörpers erstreckt und an ihren Stirnseiten offen ist. Es kann nämlich dann die Hubbewegung der Schleifscheibe dazu ausgenutzt werden, die Schleifscheibe über die gesamte Länge der Profilnut-im Abrichtkörper zu führen, so dass die Schleifscheibe von verschiedenen Bereichen der Profilnut nacheinander geschliffen wird. Dies setzt die Abnutzung des Abrichtkörpers wesentlich herab. Auch dieser Vorgang lässt sich ohne weiteres im normalen Betrieb durchführen.It is particularly advantageous if the profile groove in the dressing body runs parallel to the grinding wheel stroke in the case of a grinding wheel performing a reciprocating stroke movement, and in particular if the profile groove extends over the entire length of the dressing body and is open on its end faces. This is because the lifting movement of the grinding wheel can then be used to guide the grinding wheel over the entire length of the profile groove in the dressing body, so that the grinding wheel is ground successively from different areas of the profile groove. This significantly reduces the wear of the dressing body. This process can also be easily carried out in normal operation.

Bei einer bevorzugten Ausführungsform ist vorgesehen, dass der Abrichtkörper nebeneinander mehrere Profilnuten unterschiedliche Querschnittsform aufweist und quer zu seiner Zustellrichtung verschiebbar ist. Mit dieser'Verschiebung kann einmal eine bestimmte Profilnut gegenüber der Schleifscheibe ausgerichtet werden, zum anderen wird durch die bevorzugte Ausgestaltung möglich, die Schleifscheibe mit verschiedenen Profilen zu versehen, da die die Schleifscheibe abrichtende Profilnut durch die Querverschiebung des Abrichtkörpers ausgewechselt werden kann.In a preferred embodiment it is provided that the dressing body has a plurality of profile grooves of different cross-sectional shape next to one another and is displaceable transversely to its feed direction. With this shift, a certain profile groove can be aligned with the grinding wheel, on the other hand, the preferred embodiment makes it possible to provide the grinding wheel with different profiles, since the profile groove dressing the grinding wheel can be replaced by the transverse displacement of the dressing body.

Günstig ist es, wenn die Schleifflächen der Profilnut mit Diamanten besetzt sind. Damit erhält man eine besonders widerstandsfähige Schleiffläche.It is favorable if the grinding surfaces of the profile groove are set with diamonds. This gives you a particularly resistant grinding surface.

Die nachfolgende Beschreibung bevorzugter Ausführungsform der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:

  • Figur l - eine schematische schaubildliche Ansicht der wesentlichen Teile der CNC-gesteuerten Projektionsformenschleifmaschine mit einer Abrichtvorrichtung gemäss der Erfindung;
  • Figur 2 - eine vergrösserte perspektivische Teilansicht der Schleifscheibenlagerung und der Abrichtvorrichtung der Schleifmaschine der Figur 1;
  • Figur 3 - ein erstes bevorzugtes Ausführungsbeispiel eines Abrichtkörpers und
  • Figur 4 - ein weiteres bevorzugtes Ausführungsbeispiel eines Abrichtkörpers.
The following description of preferred embodiment of the invention serves in conjunction with the drawing for a more detailed explanation. Show it:
  • Figure l - a schematic perspective view of the essential parts of the CNC-controlled projection grinding machine with a dressing device according to the invention;
  • Figure 2 is an enlarged perspective partial view of the grinding wheel bearing and the dressing device of the grinding machine of Figure 1;
  • Figure 3 - a first preferred embodiment of a dressing body and
  • Figure 4 - another preferred embodiment of a dressing body.

Die Erfindung wird im folgenden anhand einer optischen Projektionsformenschleifmaschine erörtert, sie ist jedoch bei anderen Präzisionsschleifmaschinen ebenfalls anwendbar.The invention is discussed below with reference to an optical projection shape grinding machine, but it can also be used with other precision grinding machines.

Die in Figur 1 dargestellte Projektionsformenschleifmaschine weist einen Kreuztisch 1 mit senkrecht zueinander verfahrbaren Schlitten 2, 3 auf, die mittels Stellmotoren 4 bzw. 5 verschiebbar sind. Der obere Schlitten 3 (Fig. 2) trägt eine Halterung 6 für eine Schleifscheibe 7. Die Halterung 6 ist an einem auf dem oberen Schlitten 3 aufgesetzten Träger 8 in senkrechter Richtung verschiebbar, so dass die Schleifscheibe im Betrieb oszillierendauf- und abbewegbar ist, wie dies durch den Pfeil 9 in Fig. 2 dargestellt ist.The projection shape grinding machine shown in FIG. 1 has a cross table 1 with slides 2, 3 which can be moved perpendicular to one another and which can be displaced by means of servomotors 4 and 5, respectively. The upper carriage 3 (FIG. 2) carries a holder 6 for a grinding wheel 7. The holder 6 is displaceable in the vertical direction on a carrier 8 placed on the upper carriage 3, so that the grinding wheel can be moved up and down during operation, such as this is represented by the arrow 9 in Fig. 2.

Auf einem weiteren Kreuztisch 10 ist das zu bearbeitende Werkstück 11 befestigt (Fig. l). Es kann mittels des Kreuztisches 10 in eine Bearbeitungsposition vorgeschoben werden, in welcher die Schleifscheibe mit dem Werkstück in Eingriff gebracht werden kann.The workpiece 11 to be machined is fastened on a further cross table 10 (FIG. 1). It can be advanced by means of the cross table 10 into a processing position in which the grinding wheel can be brought into engagement with the workpiece.

Die Eingriffstelle kann auf einem Projektionsschirm 12 vergrössert abgebildet werden. Zu diesem Zweck sind eine die Eingriffstelle beleuchtende Lichtquelle 13, ein Projektionsobjektiv 14 sowie Umlenkspiegel 15 und 16 vorgesehen. Auf dem Projektionsschirm wird dadurch ein Schattenbild 18 der Schleifscheibe 7 sowie ein Schattenbild 19 des Werkstückes 11 abgebildet. Auf den Projektionsschirm 12 wird normalerweise ein transparenter Träger aufgelegt, welcher die Sollformkurve enthält, so dass man unmittelbar die Istform des Werkstückes mit der Sollform vergleichen kann.The point of intervention can be shown enlarged on a projection screen 12. For this purpose, a light source 13 illuminating the point of engagement, a projection objective 14 and deflecting mirrors 15 and 16 are provided. As a result, a silhouette 18 of the grinding wheel 7 and a silhouette 19 of the workpiece 11 are depicted on the projection screen. A transparent support, which contains the target shape curve, is normally placed on the projection screen 12, so that the actual shape of the workpiece can be compared directly with the target shape.

Im Betrieb wird die Schleifscheibe so gesteuert, dass sie eine der Sollform entsprechende Kontur in das Werkstück einschleift. Dies kann manuell geschehen, zu diesem Zweck sind Handräder 20 und 21 vorgesehen, welche die Schlitten 2 und 3 des Kreuztisches 1 in jeweils eine Richtung verschieben.During operation, the grinding wheel is controlled so that it grinds a contour that corresponds to the target shape into the workpiece. This can be done manually, for this purpose handwheels 20 and 21 are provided which move the slides 2 and 3 of the cross table 1 in one direction.

Die Steuerung wird jedoch normalerweise mittels einer CNC-Steuerung 22 erfolgen, welche die Stellmotoren 4 und 5 entsprechend ansteuert.However, the control will normally take place by means of a CNC control 22, which controls the servomotors 4 and 5 accordingly.

An dem Träger 8 ist weiterhin eine Abrichtvorrichtung 23 gehalten, die einen in Richtung auf die Schleifscheibe 7 zustellbaren Halter 24 umfasst. Die Zustellbewegung des Halters lässt sich manuell durchführen oder mittels eines Stellmotors 25, der ebenfalls von der CNC-Steuerung 22 steuerbar ist.A dressing device 23 is also held on the carrier 8 and comprises a holder 24 that can be advanced in the direction of the grinding wheel 7. The feed movement of the holder can be carried out manually or by means of a servomotor 25, which can also be controlled by the CNC control 22.

An seinem der Schleifscheibe zugewandten Ende trägt der Halter 24 einen Abrichtkörper 26, dessen Ausbildung im folgenden insbesondere anhand der Figuren 3 und 4 erläutert wird. Der Abrichtkörper 26 weist auf seiner der Schleifscheibe zugewandten Seite eine zur Schleifscheibe hin offene Profilnut 27 auf, die sich im dargestellten Ausführungsbeispiel über die gesamte Länge des Abrichtkörpers 26 erstreckt und an den Stirnseiten offen ist. Die Oberfläche der Profilnut 27 ist als Schleiffläche ausgebildet, beispielsweise durch Beschichtung mit Diamanten. Die Querschnittsform ist dem gewünschten Schleifscheibenprofil komplementär.At its end facing the grinding wheel, the holder 24 carries a dressing body 26, the design of which is explained below in particular with reference to FIGS. 3 and 4. The dressing body 26 has on its side facing the grinding wheel a profile groove 27 which is open towards the grinding wheel and which extends in the exemplary embodiment shown over the entire length of the dressing body 26 and is open on the end faces. The surface of the profile groove 27 is designed as a grinding surface, for example by coating with diamonds. The cross-sectional shape is complementary to the desired grinding wheel profile.

Der in Figur 3 dargestellte Abrichtkörper weist nur eine einzige Profilnut 27 auf, dieser Abrichtkörper kann mittels eines Fortsatzes 28 auf seiner Rückseite an dem Halter 24 befestigt werden.The dressing body shown in Figure 3 has only a single profile groove 27, this dressing body can be attached to the holder 24 by means of an extension 28 on its rear side.

Dagegen sind in dem in Figur 4 dargestellten Abrichtkörper 26 drei Profilnuten 27 nebeneinander angeordnet, die verschiedene Profilformen aufweisen. Dieser Abrichtkörper 26 ist mittels eines schwalbenschwanzförmigen Fortsatzes 29 in einer entsprechenden Nut im Halter 24 gehalten, so dass der Abrichtkörper 26 quer zur Längsrichtung der Profilnut verschieblich ist. Dadurch lassen sich wahlweise verschiedene Profilnuten in die Schleifscheibenebene verschieben.In contrast, in the dressing body 26 shown in FIG. 4, three profile grooves 27 are arranged side by side, which have different profile shapes. This dressing body 26 is held in a corresponding groove in the holder 24 by means of a dovetail-shaped extension 29, so that the dressing body 26 is displaceable transversely to the longitudinal direction of the profile groove. As a result, different profile grooves can be moved into the grinding wheel plane.

Die Längsrichtung der.Profilnuten 27 ist parallel zur Richtung der oszillierenden Hubbewegung der Schleifscheibe 7 angeordnet. Wenn die Schleifscheibe dagegen eine Hubbewegung nicht ausführt, sondern eine konstante Höhe einhält, stimmt die Richtung der Profilnuten mit der Richtung der Tangente an den dem Abrichtkörper 26 am nächsten gelegenen Punkt der Schleifscheibe überein.The longitudinal direction of the profile grooves 27 is arranged parallel to the direction of the oscillating stroke movement of the grinding wheel 7. If, on the other hand, the grinding wheel does not perform a lifting movement but maintains a constant height, the direction of the profile grooves coincides with the direction of the tangent to the point of the grinding wheel closest to the dressing body 26.

Zur Betätigung der Abrichtvorrichtung wird der Halter 24 mit dem Abrichtkörper 26 auf die Schleifscheibe 7 zugeschoben, bis die Schleifscheibe mit den Schleifflächen der Profilnut 27 in Kontakt kommt, so dass die Schleifscheibe abgerichtet wird. Das Profil der Schleifscheibe ergibt sich dabei aus dem Profil der jeweiligen Profilnut. Bei einer in senkrechter Richtung eine oszillierende Bewegung ausführenden Schleifscheibe, wie sie in Figur 1 dargestellt ist, erfolgt der Schleifvorgang nicht immer an derselben Stelle der Profilnut, sondern wandert je nach augenblicklicher Stellung der Schleifscheibe längs der Profilnut. Dadurch ergibt sich eine wesentlich herabgesetzte Abnutzung der Schleiffläche der Profilnut.To actuate the dressing device, the holder 24 with the dressing body 26 is pushed onto the grinding wheel 7 until the grinding wheel comes into contact with the grinding surfaces of the profile groove 27, so that the grinding wheel is dressed. The profile of the grinding wheel results from the profile of the respective profile groove. In the case of a grinding wheel which carries out an oscillating movement in the vertical direction, as shown in FIG. 1, the grinding process does not always take place at the same point on the profile groove, but moves along the profile groove depending on the instantaneous position of the grinding wheel. This results in a significantly reduced wear of the grinding surface of the profile groove.

Sobald die Schleifscheibe die gewünschte Form erreicht hat, lässt sich die Abrichtvorrichtung durch Zurückschieben des Halters 24 wieder ausser Eingriff mit der Schleifscheibe bringen.As soon as the grinding wheel has reached the desired shape, the dressing device can be brought out of engagement with the grinding wheel again by pushing back the holder 24.

Mit dem in Figur 4 dargestellten Abrichtkörper können Schleifscheiben mit unterschiedlichen Profilen versehen werden, es genügt dazu, den Abrichtkörper 26 quer zur Schleifscheibenebene zu verschieben.The dressing body shown in FIG. 4 can be used to provide grinding wheels with different profiles; it suffices to move the dressing body 26 transversely to the grinding wheel plane.

Die Zustellbewegung der Abrichtvorrichtung 23 erfolgt über den von der CNC-Steuerung gesteuerten Stellmotor 25. Diese Zustellung kann während des normalen Schleifbetriebes kontinuierlich oder in zeitlichen Abständen erfolgen. Die Grösse der Zustellung bzw. der zeitliche Abstand zwischen Zustellungen hängt vom natürlichen Abrieb der Schleifscheibe beim normalen Schleifbetrieb ab.The infeed movement of the dressing device 23 takes place via the servomotor 25 controlled by the CNC control. This infeed can take place continuously or at time intervals during normal grinding operation. The size of the infeed or the time interval between infeeds depends on the natural abrasion of the grinding wheel during normal grinding operations.

Da die Zustellbewegung von der CNC-Steuerung über den Stellmotor 25 gesteuert wird und da sich diejeweilige Form der Schleifscheibe entsprechend der Stellung der Abrichtvorrichtung 23 einstellt, verfügt die CNC-Steuerung über ein Signal, das der jeweiligen Schleifscheibengrösse entspricht. Dieses Signal kann dazu verwendet werden, den Relativabstand zwischen Schleifscheibe und Werkstück entsprechend der jeweiligen Schleifscheibengrösse nachzustellen, beispielsweise durch Betätigung des Stellmotors 4. Auf diese Weise ist während des gesamten Betriebes sichergestellt, dass der jeweilige Abrieb der Schleifscheibe berücksichtigt wird, Fehlmasse aufgrund einer Abnutzung der Schleifscheibe werden dadurch praktisch ausgeschlossen.Since the feed movement is controlled by the CNC control via the servomotor 25 and since the respective shape of the grinding wheel adjusts itself according to the position of the dressing device 23, the CNC control has a signal which corresponds to the respective grinding wheel size. This signal can be used to adjust the relative distance between the grinding wheel and the workpiece in accordance with the respective grinding wheel size, for example by actuating the servomotor 4. In this way it is ensured during the entire operation that the respective abrasion of the grinding wheel is taken into account, incorrect mass due to wear of the This virtually eliminates the grinding wheel.

Das Abrichten der Schleifscheibe ist zudem in keiner Weise zeitaufwendig, da es während des normalen Betriebsablaufes erfolgen kann; eine Unterbrechung ist dazu nicht notwendig.Dressing the grinding wheel is also in no way time-consuming, since it can take place during normal operation; an interruption is not necessary.

Vorteilhaft ist auch, dass die Schleifscheibe mit unterschiedlichen Profilen abgerichtet werden kann, die sich aufgrund der jeweiligen Querschnittsform der Profilnuten 27 ergeben.It is also advantageous that the grinding wheel can be dressed with different profiles that result from the respective cross-sectional shape of the profile grooves 27.

Claims (7)

1. Präzisionsschleifmaschine,insbesondere Projektions-FormenSchleifmaschine, mit einer ein Werkstück bearbeitenden Schleifscheibe sowie mit einem Abrichtkörper, der mit mindestens einer sich tangential zur Schleifscheibe erstreckenden, zur Schleifscheibe hin offenen Profilnut versehen ist, deren Oberfläche als Schleiffläche ausgebildet ist und deren Querschnitt dem gewünschten Schleifscheibenprofil komplementär ist; dadurch gekennzeichnet , dass der Abrichtkörper (26) zur Bearbeitung der Schleifscheibe (7) in der Ebene der Schleifscheibe (7) auf die Schleifscheibe (7) zustellbar ist, dass die Zustellung des Abrichtkörpers von einer CNC-Steuerung (22) steuerbar ist, die auch die Schleifmaschine steuert, und dass die CNC-Steuerung (22) den Abstand zwischen Schleifscheibe (7) und zu bearbeitendem Werkstück (11) entsprechend der jeweiligen Stellung des Abrichtkörpers (26) relativ zur Schleifscheibe (7) verändert.1.Precision grinding machine, in particular projection-shape grinding machine, with a grinding wheel machining a workpiece and with a dressing body which is provided with at least one profile groove which extends tangentially to the grinding wheel and is open towards the grinding wheel, the surface of which is designed as a grinding surface and the cross section of which corresponds to the desired grinding wheel profile is complementary; characterized in that the dressing body (26) for processing the grinding wheel (7) in the plane of the grinding wheel (7) on the grinding wheel (7) is adjustable in that the infeed of the dressing body can be controlled by a CNC controller (22) which also controls the grinding machine and that the CNC control (22) changes the distance between the grinding wheel (7) and the workpiece (11) to be machined in accordance with the respective position of the dressing body (26) relative to the grinding wheel (7). 2. Präzisionsschleifmaschine nach Anspruch 1, dadurch gekennzeichnet, dass die Abrichtvorrichtung (23) an einem Träger (8) gelagert ist, an welchem auch die Schleifscheibe (7) gelagert ist.2. Precision grinding machine according to claim 1, characterized in that the dressing device (23) is mounted on a carrier (8) on which the grinding wheel (7) is also mounted. 3. Präzisionsschleifmaschine nach Anspruch 1, dadurch gekennzeichnet, dass die Profilnut (27) im Abrichtkörper (26) bei einer im Betrieb eine reziprozierende Hubbewegung ausführenden Schleifscheibe (7) parallel zum Schleifscheibenhub verläuft.3. Precision grinding machine according to claim 1, characterized in that the profile groove (27) in the dressing body (26) runs parallel to the grinding wheel stroke in the case of a grinding wheel (7) executing a reciprocating lifting movement. 4. Präzisionsschleifmaschine nach Anspruch 3, dadurch gekennzeichnet, dass die Profilnut (27) sich über die gesamte Länge des Abrichtkörpers (26) erstreckt und an ihren Stirnseiten offen ist.4. Precision grinding machine according to claim 3, characterized in that the profile groove (27) extends over the entire length of the dressing body (26) and is open at its end faces. 5. Präzisionsschleifmaschine nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass der Abrichtkörper (26) nebeneinander mehrere Profilnuten (27) unterschiedlicher Querschnittsform aufweist und quer zu seiner Zustellrichtung verschiebbar ist.5. Precision grinding machine according to one of the preceding claims, characterized in that the dressing body (26) side by side has a plurality of profile grooves (27) of different cross-sectional shape and is displaceable transversely to its feed direction. 6. Präzisionsschleifmaschine nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Schleifflächen der .Profilnuten (27) mit Diamanten besetzt sind.6. Precision grinding machine according to one of the preceding claims, characterized in that the grinding surfaces of the .profile grooves (27) are set with diamonds. 7. Präzisionsschleifmaschine nach einem der voranstehenden .Ansprüche, dadurch gekennzeichnet, dass die Zustellbewegung des Abrichtkörpers (26) von einem Stellmotor (25) durchführbar ist.7. Precision grinding machine according to one of the preceding claims, characterized in that the feed movement of the dressing body (26) can be carried out by a servomotor (25).
EP82107665A 1981-09-12 1982-08-21 Precision grinding machine, in particular projection form grinding machine Expired EP0074518B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813136240 DE3136240A1 (en) 1981-09-12 1981-09-12 PRECISION GRINDING MACHINE, IN PARTICULAR PROJECTION SHAPING GRINDING MACHINE
DE3136240 1981-09-12

Publications (4)

Publication Number Publication Date
EP0074518A2 true EP0074518A2 (en) 1983-03-23
EP0074518A3 EP0074518A3 (en) 1983-07-20
EP0074518B1 EP0074518B1 (en) 1986-01-29
EP0074518B2 EP0074518B2 (en) 1989-04-05

Family

ID=6141500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107665A Expired EP0074518B2 (en) 1981-09-12 1982-08-21 Precision grinding machine, in particular projection form grinding machine

Country Status (3)

Country Link
EP (1) EP0074518B2 (en)
JP (1) JPS5882662A (en)
DE (2) DE3136240A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0121212A2 (en) * 1983-03-31 1984-10-10 Werkzeugmaschinenbau Präzisions-Technik GmbH Wertheim Method of controlling the service performance of projection form grinding machines
US4596066A (en) * 1983-03-16 1986-06-24 Inoue-Japax Research Incorporated Machining center
EP0417050A2 (en) * 1989-09-07 1991-03-13 Pfauter Italia S.P.A. Equipment for dressing worm type grinding tools in gear grinding machinery
GB2348837A (en) * 1996-06-15 2000-10-18 Unova Uk Ltd Grinding machine
CN102218682A (en) * 2011-03-24 2011-10-19 新乡日升数控轴承装备股份有限公司 Numerical control grinding machine of tapered roller

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61141067U (en) * 1985-02-22 1986-09-01
JPH0123728Y2 (en) * 1985-03-29 1989-07-20
JPH0639056B2 (en) * 1988-04-21 1994-05-25 牧野フライス精機株式会社 Method and device for grinding stone of NC tool grinder
CN102528620A (en) * 2011-11-10 2012-07-04 贵州英特利智能控制工程研究有限责任公司 Five-axis linkage numerical-control tool grinding machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE473868C (en) * 1927-05-19 1929-03-26 Johannes Wilberz Removal and provision of the grinding wheel on precision grinding machines for dressing and after dressing in the original work position that must be precisely maintained
GB1213631A (en) * 1966-11-18 1970-11-25 Wickman Mach Tool Sales Ltd Profile grinding machines
DE2452396A1 (en) * 1974-11-05 1976-05-13 Heckler & Koch Gmbh Profile grinding machine with disc carrying slide - disc is supported in carrier which continuously assumes controlling position

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE165235C (en) *
AT23431B (en) * 1904-05-03 1906-03-10 Richard Klinger Device for grinding profiles and facets.
US2337183A (en) * 1941-11-03 1943-12-21 American Optical Corp Honing device
US2770925A (en) * 1954-10-19 1956-11-20 Wheel Trueing Tool Co Form dressing tool
JPS5113491A (en) * 1974-07-24 1976-02-02 Nippei Sangyo Kk KENSAKUBAN
JPS5537201A (en) * 1978-08-29 1980-03-15 Isao Tomizawa Grinder wheel shaping method at orifice of small-diameter tube
US4274231A (en) * 1978-12-20 1981-06-23 Boyar-Schultz Corporation Method and apparatus for dressing a grinding wheel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE473868C (en) * 1927-05-19 1929-03-26 Johannes Wilberz Removal and provision of the grinding wheel on precision grinding machines for dressing and after dressing in the original work position that must be precisely maintained
GB1213631A (en) * 1966-11-18 1970-11-25 Wickman Mach Tool Sales Ltd Profile grinding machines
DE2452396A1 (en) * 1974-11-05 1976-05-13 Heckler & Koch Gmbh Profile grinding machine with disc carrying slide - disc is supported in carrier which continuously assumes controlling position

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
OBERFL[CHENTECHNIK, 53. Jahrg., Oktober-Dezember 1976, Coburg "Die neue numerisch gesteuerte Formschleifmaschine für Messerköpfe und Fräser", Seite 384 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4596066A (en) * 1983-03-16 1986-06-24 Inoue-Japax Research Incorporated Machining center
EP0121212A2 (en) * 1983-03-31 1984-10-10 Werkzeugmaschinenbau Präzisions-Technik GmbH Wertheim Method of controlling the service performance of projection form grinding machines
EP0121212A3 (en) * 1983-03-31 1986-09-03 Wertheim Praezisions Tech Method of controlling the service performance of projection form grinding machines
EP0417050A2 (en) * 1989-09-07 1991-03-13 Pfauter Italia S.P.A. Equipment for dressing worm type grinding tools in gear grinding machinery
EP0417050A3 (en) * 1989-09-07 1992-05-27 C.I.M.A. Costruzioni Italiane Macchine Attrezzi S.P.A. Equipment for dressing worm type grinding tools in gear grinding machinery
GB2348837A (en) * 1996-06-15 2000-10-18 Unova Uk Ltd Grinding machine
GB2348837B (en) * 1996-06-15 2001-01-17 Unova Uk Ltd Improvements in and relating to grinding and polishing machines
CN102218682A (en) * 2011-03-24 2011-10-19 新乡日升数控轴承装备股份有限公司 Numerical control grinding machine of tapered roller

Also Published As

Publication number Publication date
DE3136240A1 (en) 1983-03-31
EP0074518B2 (en) 1989-04-05
EP0074518A3 (en) 1983-07-20
EP0074518B1 (en) 1986-01-29
JPS5882662A (en) 1983-05-18
DE3268825D1 (en) 1986-03-13

Similar Documents

Publication Publication Date Title
DE2760355C2 (en)
DE2654404C2 (en) Transparent drawing to be placed on the screen of a numerically controllable projection shape grinding machine
DE2742307A1 (en) METHOD AND DEVICE FOR GRINDING AND / OR POLISHING OPTICAL SURFACES
DE69000888T2 (en) METHOD AND DEVICE FOR BEVELING RECOVERING CORNERS IN COLORED OR NON-COLORED FLAT GLASS PANELS.
DE2814676A1 (en) DEVICE FOR HONING GEARS
DE9318933U1 (en) Device for cutting a glass sheet
DE485404C (en) Device for controlling the support and storage device on grinding machines
EP0074518B1 (en) Precision grinding machine, in particular projection form grinding machine
DE4232497C2 (en) Device for positioning a body on a conveyor
EP0602308B1 (en) Device for working the side edges of continuously fed panel shaped workpieces
DE3512761C2 (en)
DE3911719C2 (en)
DE2827917C2 (en) Grinding machine for rounding the corners of rectangular, plate-shaped workpieces
DE19518710C1 (en) Device for path-controlled sharpening of saw teeth
DE6902724U (en) GRINDING MACHINE FOR PRECISION GRINDING OF A TOOL.
DE19523423A1 (en) Method of machining stub weld seams for coils, esp. saw belts
DE3048738C2 (en) Feed device for intermittent turning of a circular saw blade
DE2723231B2 (en) Machine for rounding the corners of glass sheets with a predetermined radius
CH701185A2 (en) A method for operating a hard finishing machine.
DE69100785T2 (en) Grinding machine.
DE3220038C2 (en) Milling device for processing the side surfaces of stones
EP0549821A1 (en) Procedure for honing bore holes and honing tool for carrying out the procedure
AT399142B (en) Device for cutting a glass plate
DE2829310C2 (en)
DE626282C (en) Automatic lathe

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

Designated state(s): CH DE FR GB IT LI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19840119

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO MILANO S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): CH DE FR GB IT LI

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3268825

Country of ref document: DE

Date of ref document: 19860313

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: HAUNI-WERKE KOERBER & CO. KG

Effective date: 19861024

REG Reference to a national code

Ref country code: CH

Ref legal event code: PUE

Owner name: WERKZEUGMASCHINENBAU PRAEZISIONS-TECHNIK GMBH

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: WERKZEUGMASCHINENBAU PRAEZISIONS-TECHNIK GMBH WER

R26 Opposition filed (corrected)

Opponent name: KOERBER AG

Effective date: 19861024

ITPR It: changes in ownership of a european patent

Owner name: CESSIONE;WERKZEUGMASCHINENBAU PRAEZISIONS-TECHNIK

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

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

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: WERKZEUGMASCHINENBAU PRAEZISIONS-TECHNIK GMBH

27A Patent maintained in amended form

Effective date: 19890405

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): CH DE FR GB IT LI

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO MILANO S.P.A.

ET3 Fr: translation filed ** decision concerning opposition
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19920622

Year of fee payment: 11

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

Ref country code: FR

Payment date: 19920629

Year of fee payment: 11

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

Ref country code: GB

Payment date: 19920807

Year of fee payment: 11

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

Ref country code: DE

Payment date: 19920924

Year of fee payment: 11

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

Ref country code: GB

Effective date: 19930821

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

Ref country code: LI

Effective date: 19930831

Ref country code: CH

Effective date: 19930831

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930821

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

Ref country code: FR

Effective date: 19940429

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: DE

Effective date: 19940503

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST