EP0299915B1 - Method and apparatus for machining workpieces - Google Patents

Method and apparatus for machining workpieces Download PDF

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Publication number
EP0299915B1
EP0299915B1 EP19880810027 EP88810027A EP0299915B1 EP 0299915 B1 EP0299915 B1 EP 0299915B1 EP 19880810027 EP19880810027 EP 19880810027 EP 88810027 A EP88810027 A EP 88810027A EP 0299915 B1 EP0299915 B1 EP 0299915B1
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EP
European Patent Office
Prior art keywords
shank
workpiece
chuck
bearings
processing area
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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.)
Expired - Lifetime
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EP19880810027
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German (de)
French (fr)
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EP0299915A1 (en
Inventor
Jürgen Reinhard
Edy Käser
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SAFAG AG Maschinen- und Pumpenfabrik
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SAFAG AG Maschinen- und Pumpenfabrik
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Publication of EP0299915A1 publication Critical patent/EP0299915A1/en
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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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/066—Work supports, e.g. adjustable steadies adapted for supporting work in the form of tools, e.g. drills
    • 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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/247—Supports for drills

Definitions

  • the present invention relates to a method for machining workpieces with a shank and a machining area, in particular for grinding the cutting area of twist drills, reamers or end mills, the shank of the workpiece being clamped in a pair of pliers and the machining area being supported, and a device for carrying out the method with pliers for clamping the workpiece and with supports for the workpiece.
  • the invention particularly relates to the machining of small tools in the diameter range of the cutting edge from 0.1 to 6 mm and in the shank from 1-6 mm. As the tools bend due to the grinding pressure when grinding small diameters, the workpiece is supported in the production of grooved tools (US-A-4 068 414).
  • the aim of the present invention is to eliminate the disadvantages mentioned and to achieve ideal clamping and support of the workpiece in all cases without undue stress on the workpiece.
  • the solution is that the support in the machining area and the shaft is carried out and set independently.
  • a device is also proposed with independently adjustable supports for the shaft and the machining area of the workpiece. On the one hand, this frees you from a certain precise shape of a uniform, rigid support for the machining area and the shank of the workpiece, and on the other hand, ideal support or pretensioning and deformation of the workpiece can be set in the area of the shank or in the machining area.
  • the supports can be adjusted independently of one another in several directions and can additionally be pivoted about at least one axis in order to achieve optimal support. Furthermore, the supports can be exchangeable to adapt the same different workpieces and other conditions.
  • the device shown has a prestressed guide 1, on which a block-like housing 2 can be moved.
  • the device shown is designed as a twin unit, which has similar supports 3 and 4 on both end faces.
  • the support 3 is used to support the small-diameter cutting edge 5 of a drill whose spiral grooves are to be machined with a grinding wheel, not shown.
  • the shaft 6 of this drill which has a larger diameter than the cutting edge 5, is clamped in a rotatable collet 7 and supported on the support 4.
  • the support 3 is interchangeably inserted in a holder 8 and held by means of rows of grub screws 9 arranged on both sides.
  • the holder 8 is inserted into a slide 11 (FIG. 2) so as to be pivotable about an axis 10 and can be pivoted in a certain range by means of a spindle 12.
  • the carriage 11 can be adjusted horizontally in FIG. 2 by means of a spindle 13, specifically in a further carriage 14 (FIG. 1) which is arranged to be displaceable in the longitudinal direction of the housing 2.
  • the position of the slide 14 is determined by the position of a wedge-shaped link 15 which can be adjusted by means of a spindle 16.
  • the support 3 can thus be displaced linearly in relation to the drawing plane according to FIG.
  • the support 4 can accordingly be brought into the desired angular position by grub screws 9 in a plane perpendicular to the drawing plane and by a grub screw 17 in the drawing plane.
  • a slide 11 ' By means of a slide 11 ', a linear setting perpendicular to the plane of the drawing by actuating a spindle 13' respectively.
  • a linear setting in the plane of the drawing can be made via a carriage 14 'a wedge-shaped backdrop 15' and a spindle 16 '.
  • corresponding screw heads for actuating the spindles are given the same names as the spindles in the upper part of FIG. 1.
  • any eccentricity of the collet 7 or the clamping of the workpiece in the same should therefore be fully compensated.
  • the position of the support 4 is already selected such that the shank 6 of the workpiece is elastically pretensioned or bent so far that any eccentricity is compensated for.
  • this requires a certain minimal misalignment of the shaft and in particular of the cutting edge 5 and a corresponding adjustment and adjustment of the position of the support 3.
  • This adjustment must be carried out in such a way that the cutting edge 5 is clearly supported over the entire length without excessive bending stresses. This is optimally possible due to the pivoting possibility and fine adjustment of the support 3.
  • the deformation of the shank 6 can be in the order of magnitude of mm, for example 1 to 2/100 mm, while the deformation of the cutting edge 5 with respect to the shank amounts to ⁇ m, for example up to a maximum of 5 ⁇ m.
  • the supports can preferably be a shell with an approximately semicircular profile that is dimensioned in accordance with the diameter of the workpiece part to be supported.
  • other supports for example prisms, sleeves or the like, could also be provided.
  • the supports can be easily replaced and they are made of a hard, wear-resistant material, such as hard metal or ceramic.
  • twin unit is selected as the exemplary embodiment, a corresponding simple unit with only one support 3 and 4 each could of course be provided.
  • setting of these supports could be done differently, for example by means of spindles which are all in the direction of the setting movement.
  • Other workpieces of similar dimensions and shape can be supported and processed accordingly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Bearbeiten von Werkstücken mit einem Schaft und einem Bearbeitungsbereich, insbesondere zum Schleifen des Schneidenbereichs von Spiralbohrern, Reibahlen oder Fingerfräsern, wobei der Schaft des Werkstücks in einer Zange gespannt und der Bearbeitungsbereich unterstützt wird und eine Einrichtung zur Durchführung des Verfahrens mit einer Zange zum Spannen des Werkstücks und mit Auflagern für das Werkstück. Die Erfindung betrifft besonders die Bearbeitung von Kleinstwerkzeugen im Durchmesserbereich der Schneide von 0,1 bis 6 mm und im Schaft von 1-6 mm. Da durch den Schleifdruck beim Schleifen geringer Durchmesser sich die Werkzeuge durchbiegen, erfolgt bei der Fertigung von genuteten Werkzeugen eine Unterstützung des Werkstücks (US-A-4 068 414). Es war üblich, das Werkzeug in einer Halbschale oder in einer geschlitzten Patrone zu unterstützen und zu schleifen. Es erfolgte dabei eine gemeinsame Unterstützung des Schaftes und der Schneide mittels eines einheitlichen starren Auflagers. Dabei ergeben sich erste Schwierigkeiten dadurch, das bei kleinen Werkzeugen der Schaft einen grösseren Durchmesser aufweist als die Schneide, wobei z.B. der Schaft einen genormten Durchmesser von 3, 125 mm und die Schneide einen Durchmesser von 0,5 mm aufweisen kann. Das Auflager zur Unterstützung eines derartigen Werkstücks muss daher eine ganz bestimmte Form aufweisen. Trotz dieser Schwierigkeit ist es kaum möglich, eine in allen Belangen ideale Unterstützung und Beanspruchung des Schaftes und insbesondere des zu bearbeitenden Bereichs des Werkstücks zu erzielen. Wollte man nämlich eine genügend hohe Vorspannung des zu bearbeitenden Werkstückbereiches erzielen um jede Unrundheit oder Exzentrizität der drehbaren Spannzange bzw. der Einspannung des Werkstücks in diese Zange aufzuheben, muss unter Umständen der zu bearbeitende Werkstückteil unzulässig stark vorgespannt und durchgebogen werden.The present invention relates to a method for machining workpieces with a shank and a machining area, in particular for grinding the cutting area of twist drills, reamers or end mills, the shank of the workpiece being clamped in a pair of pliers and the machining area being supported, and a device for carrying out the method with pliers for clamping the workpiece and with supports for the workpiece. The invention particularly relates to the machining of small tools in the diameter range of the cutting edge from 0.1 to 6 mm and in the shank from 1-6 mm. As the tools bend due to the grinding pressure when grinding small diameters, the workpiece is supported in the production of grooved tools (US-A-4 068 414). It was common to support and grind the tool in a half-shell or in a slotted cartridge. The shaft and cutting edge were jointly supported by means of a uniform, rigid support. The first difficulties arise from the fact that, in the case of small tools, the shank has a larger diameter than the cutting edge, for example the shank having a standardized diameter of 3.125 mm and the cutting edge having a diameter of 0.5 mm. The support for supporting such a workpiece must therefore have a very specific shape. Despite this difficulty, it is hardly possible to achieve ideal support and loading of the shank and in particular the area of the workpiece to be machined in all respects. If you wanted to achieve a sufficiently high preload of the workpiece area to be machined in order to remove any out-of-roundness or eccentricity of the rotatable collet or the clamping of the workpiece in this collet, the one to be machined may have to be Workpiece part must be preloaded and bent too much.

Ziel vorliegender Erfindung ist es, die erwähnten Nachteile zu beheben und in allen Fällen eine ideale Einspannung und Unterstützung des Werkstücks ohne unzulässige Beanspruchung desselben zu erzielen. Die Lösung besteht darin, dass die Unterstützung im Bearbeitungsbereich und des Schaftes unabhängig voneinander erfolgt und eingestellt wird. Erfindungsgemäß wird auch eine Einrichtung vorgeschlagen mit unabhängig voneinander einstellbaren Auflagern für den Schaft und den Bearbeitungsbereich des Werkstücks. Damit wird man einerseits frei von einer bestimmten genauen Formgegbung eines einheitlichen starren Auflagers für den Bearbeitungsbereich und den Schaft des Werkstücks, und andererseits kann in jedem Falle eine ideale Unterstützung bzw. Vorspannung und Verformung des Werkstücks im Bereiche des Schaftes bzw, in Bearbeitungsbereich eingestellt werden. Dabei können die Auflager unabhängig voneinander in mehreren Richtungen einstellbar und zusätzlich um mindestens eine Achse schwenkbar sein, um eine optimale Unterstützung zu erzielen. Im weiteren können die Auflager auswechselbar sein um dieselben verschiedenen Werkstücken und sonstigen Gegebenheiten anzupassen.The aim of the present invention is to eliminate the disadvantages mentioned and to achieve ideal clamping and support of the workpiece in all cases without undue stress on the workpiece. The solution is that the support in the machining area and the shaft is carried out and set independently. According to the invention, a device is also proposed with independently adjustable supports for the shaft and the machining area of the workpiece. On the one hand, this frees you from a certain precise shape of a uniform, rigid support for the machining area and the shank of the workpiece, and on the other hand, ideal support or pretensioning and deformation of the workpiece can be set in the area of the shank or in the machining area. The supports can be adjusted independently of one another in several directions and can additionally be pivoted about at least one axis in order to achieve optimal support. Furthermore, the supports can be exchangeable to adapt the same different workpieces and other conditions.

Die Erfindung wird nun anhand eines Ausführungsbeispiels einer erfindungsgemässen Einrichtung näher erläutert.

Figur 1
zeigt eine Draufsicht auf die Einrichtung, teilweise im Schnitt und
Figur 2
zeigt eine Seitenansicht der Einrichung, teilweise im Schnitt nach Linie II-II der Fig. 1

The invention will now be explained in more detail using an exemplary embodiment of a device according to the invention.
Figure 1
shows a plan view of the device, partly in section and
Figure 2
shows a side view of the device, partly in section along line II-II of FIG. 1st

Die dargestellte Einrichtung weist eine vorgespannte Führung 1 auf, auf welcher ein blockartiges Gehäuse 2 verschoben werden kann. Die dargestellte Einrichtung ist als Zwillingeinheit ausgebildet, die an beiden Stirnseiten gleichartige Auflager 3 und 4 aufweist. Wie in Figur 1 dargestellt, dient das Auflager 3 der Unterstützung der einen kleinen Durchmesser aufweisenden Schneide 5 eines Bohrers dessen Spiralnuten mit einer nicht dargestellten Schleifscheibe zu bearbeiten sind. Der Schaft 6 dieses Bohrers, welcher grössern Durchmesser aufweist als die Schneide 5, ist in einer drehbaren Spannzange 7 eingespannt und auf das Auflager 4 abgestützt.The device shown has a prestressed guide 1, on which a block-like housing 2 can be moved. The device shown is designed as a twin unit, which has similar supports 3 and 4 on both end faces. As in Figure 1 shown, the support 3 is used to support the small-diameter cutting edge 5 of a drill whose spiral grooves are to be machined with a grinding wheel, not shown. The shaft 6 of this drill, which has a larger diameter than the cutting edge 5, is clamped in a rotatable collet 7 and supported on the support 4.

Das Auflager 3 ist auswechselbar in einen Halter 8 eingesetzt und mittels beidseitig angeordneter Reihen von Madenschrauben 9 festgehalten. Der Halter 8 ist um eine Achse 10 schwenkbar in einen Schlitten 11 (Figur 2) eingesetzt und kann mittels einer Spindel 12 in einem gewissen Bereich verschwenkt werden. Der Schlitten 11 ist mittels einer Spindel 13 horizontal in Figur 2 verstellbar und zwar in einem weitern Schlitten 14 (Figur 1) welcher in Längsrichtung des Gehäuses 2 verschiebbar angeordnet ist. Die Position des Schlittens 14 ist bestimmt durch die Lage einer keilförmigen Kulisse 15 welche mittels einer Spindel 16 verstellt werden kann. Das Auflager 3 kann somit bezogen auf die Zeichnungsebene nach Figur 1 in dieser Ebene und rechtwinklig zu dieser Ebene linear verschoben werden durch Betätigung der Spindeln 13 bzw. 16. Sie kann in der Zeichnungsebene um die Achse 10 in einem erheblichen Ausmass verschwenkt und durch entsprechende Einstellung der Madenschrauben 9 in einer Ebene senkrecht zur Zeichnungsebene fein eingestellt und in die gewünschte optimale Winkelstellung verbracht werden.The support 3 is interchangeably inserted in a holder 8 and held by means of rows of grub screws 9 arranged on both sides. The holder 8 is inserted into a slide 11 (FIG. 2) so as to be pivotable about an axis 10 and can be pivoted in a certain range by means of a spindle 12. The carriage 11 can be adjusted horizontally in FIG. 2 by means of a spindle 13, specifically in a further carriage 14 (FIG. 1) which is arranged to be displaceable in the longitudinal direction of the housing 2. The position of the slide 14 is determined by the position of a wedge-shaped link 15 which can be adjusted by means of a spindle 16. The support 3 can thus be displaced linearly in relation to the drawing plane according to FIG. 1 in this plane and at right angles to this plane by actuating the spindles 13 or 16. It can be pivoted to a considerable extent in the drawing plane about the axis 10 and by appropriate adjustment the grub screws 9 are fine adjusted in a plane perpendicular to the plane of the drawing and brought into the desired optimal angular position.

Das Auflager 4 kann entsprechend durch Madenschrauben 9 in einer Ebene senkrecht zur Zeichenebene und durch eine Madenschraube 17 in der Zeichenebene in die gewünschte Winkelstellung gebracht werden. Mittels eines Schlittens 11′ kann eine lineare Einstellung rechtwinklig zur Zeichnungsebene durch Betätigen einer Spindel 13′ erfolgen. Eine lineare Einstellung in der Zeichnungsebene kann erfolgen über einen Schlitten 14′ eine keilförmige Kulisse 15′ und eine Spindel 16′. Am unteren in Ansicht dargestellten Teil der Einrichtung sind entsprechende Schraubenköpfe zur Betätigung der Spindeln gleich bezeichnet wie die Spindeln im oberen Teil der Figur 1.The support 4 can accordingly be brought into the desired angular position by grub screws 9 in a plane perpendicular to the drawing plane and by a grub screw 17 in the drawing plane. By means of a slide 11 ', a linear setting perpendicular to the plane of the drawing by actuating a spindle 13' respectively. A linear setting in the plane of the drawing can be made via a carriage 14 'a wedge-shaped backdrop 15' and a spindle 16 '. At the lower part of the device shown in the view, corresponding screw heads for actuating the spindles are given the same names as the spindles in the upper part of FIG. 1.

Aus dem vorstehenden und der Zeichnung ergibt sich, dass hier eine kompakt aufgebaute Einrichtung vorliegt welche eine individuelle weitgehende Einstellung im erforderlichen Bereich der beiden Auflager 3 und 4 gestattet. Die auf die Schneide 5 wirkenden Bearbeitungskräfte sind in wesentlichen in der Zeichnungsebene der Figur 1 nach unten gerichtet, und es ist daher insbesondere eine optimale Einstellung der Auflager 3 und 4 in dieser Richtung wesentlich, was durch die Kulissen 15 bzw. 15′ sehr genau erfolgen kann. Es wirken jedoch auch Komponenten der Bearbeitungskräfte in Axialrichtung und Umfangsrichtung des Werkstücks, und es ist daher von besonderer Wichtigkeit, auch die übrigen Einstellmöglichkeiten vorzusehen, also die Querverstellung und eine gewisse Schiefstellung der Auflager. Es ist dabei davon auszugehen, dass eine Bearbeitungsgenauigkeit im µm-Bereich nur dann sinnvoll ist, wenn auch die Positionierung des Werkstückes entsprechend genau ist. Es muss daher jede unkontrollierte Durchbiegung und jede Abweichung vom Rundlauf desselben vermieden werden. Eine eventuelle Exzentrizität der Spannzange 7 bzw. der Einspannung des Werkstücks in derselben soll daher voll kompensiert sein. Zu diesem Zweck wird die Position des Auflagers 4 bereits so gewählt, dass der Schaft 6 des Werkstücks soweit elastisch vorgespannt bzw. durchgebogen ist, dass jede Exzentrizität kompensiert ist. Das bedingt jedoch eine gewisse minimale Schiefstellung schon des Schaftes und insbesondere der Schneide 5 und eine entsprechende Einstellung und Anpassung der Position des Auflagers 3. Diese Anpassung hat so zu erfolgen, dass ohne übermässige Biegespannungen die Schneide 5 auf der ganzen Länge eindeutig abgestützt ist. Das ist durch die Schwenkmöglichkeit und Feineinstellung des Auflagers 3 optimal möglich. Die Verformung des Schaftes 6 kann hierbei in der Grössenordnung von mm, beispielsweise 1 bis 2/100 mm betragen, während die Verformung der Schneide 5 gegenüber dem Schaft um µm, beispielsweise bis höchstens 5 µm beträgt.It follows from the above and the drawing that here there is a compact device which permits extensive individual adjustment in the required area of the two supports 3 and 4. The machining forces acting on the cutting edge 5 are essentially directed downwards in the plane of the drawing in FIG. 1, and it is therefore particularly important that the supports 3 and 4 are optimally adjusted in this direction, which is done very precisely by the scenes 15 and 15 ' can. However, components of the machining forces also act in the axial direction and circumferential direction of the workpiece, and it is therefore particularly important to also provide the other adjustment options, that is to say the transverse adjustment and a certain inclination of the supports. It can be assumed that machining accuracy in the µm range only makes sense if the workpiece is positioned accordingly. Every uncontrolled deflection and any deviation from the concentricity of the same must therefore be avoided. Any eccentricity of the collet 7 or the clamping of the workpiece in the same should therefore be fully compensated. For this purpose, the position of the support 4 is already selected such that the shank 6 of the workpiece is elastically pretensioned or bent so far that any eccentricity is compensated for. However, this requires a certain minimal misalignment of the shaft and in particular of the cutting edge 5 and a corresponding adjustment and adjustment of the position of the support 3. This adjustment must be carried out in such a way that the cutting edge 5 is clearly supported over the entire length without excessive bending stresses. This is optimally possible due to the pivoting possibility and fine adjustment of the support 3. The deformation of the shank 6 can be in the order of magnitude of mm, for example 1 to 2/100 mm, while the deformation of the cutting edge 5 with respect to the shank amounts to μm, for example up to a maximum of 5 μm.

Wie in Figur 2 angedeutet, können die Auflager vorzugsweise eine dem Durchmesser des abzustützenden Werkstückteils entsprechend bemessene Schale mit etwa halbkreisförmigem Profil sein. Es könnten jedoch auch andere Auflager, beispielsweise Prismen, Hülsen oder dergleichen vorgesehen sein. Die Auflager können leicht ausgewechselt werden und sie bestehen aus einem harten, verschleisfesten Werkstoff, beispielsweise Hartmetall oder Keramik.As indicated in FIG. 2, the supports can preferably be a shell with an approximately semicircular profile that is dimensioned in accordance with the diameter of the workpiece part to be supported. However, other supports, for example prisms, sleeves or the like, could also be provided. The supports can be easily replaced and they are made of a hard, wear-resistant material, such as hard metal or ceramic.

Es sind verschiedene Ausführungsvarianten möglich. Während als Ausführungsbeispiel eine Zwillingseinheit gewählt ist, könnte natürlich eine entsprechende einfache Einheit mit nur je einem Auflager 3 und 4 vorgesehen sein. Die Einstellung dieser Auflager könnte gerade in diesem Falle anders erfolgen, beispielsweise durch Spindeln die alle in der Richtung der Einstellbewegung liegen. Es können andere Werkstücke ähnlicher Abmessungen und Form entsprechend unterstützt und bearbeitet werden.Different versions are possible. While a twin unit is selected as the exemplary embodiment, a corresponding simple unit with only one support 3 and 4 each could of course be provided. In this case, the setting of these supports could be done differently, for example by means of spindles which are all in the direction of the setting movement. Other workpieces of similar dimensions and shape can be supported and processed accordingly.

Claims (10)

1. A method for machining workpieces having a shank and a processing area, in particular for grinding the cutting edge area of twist drills, reamers, or end-milling cutters, wherein the shank of the workpiece is clamped in a chuck and the workpiece is supported, characterized in that the support of the processing area and of the shank is effected and adjusted independently.
2. A method according to claim 1, characterized in that both the shank and the processing area are elastically deformed by the support.
3. A method according to claim 2, characterized in that the shank is deformed more than the processing area.
4. A method according to claim 3, characterized in that the shank is given a bending of hundredths of millimeters, e.g. of 1 to 2/100 mm, and the processing area is given an additional bending with respect to the shank of micrometers, e.g. up to 5 µm.
5. A method according to any one of claims 1-4, characterized in that the shank is bent to such an extent that any eccentricity of the chuck, respectively of the chucking of the shank in the chuck, is compensated.
6. A device for implementing the method according to any one of claims 1-5, comprising a chuck (7) in order to clamp the workpiece (5, 6) and bearings (3, 4) for the workpiece, characterized by independently adjustable bearings (3, 4) for the shank (6) and the processing area (5) of the workpiece.
7. A device according to claim 6, characterized in that the bearings (3, 4) are adjustable in several directions.
8. A device according to claim 7, characterized in that the bearings (3, 4) are adjustable in two coordinate directions in a radial plane with respect to the chuck respectively the workpiece axis and slewable in at least one plane in parallel to the axis of the chuck (7) respectively the workpiece (5, 6).
9. A device according to claim 8, characterized in that the bearings (3, 4) are slewable in two planes.
10. A device according to any one of claims 6 to 9, characterized in that bearings (3, 4) such as shells, prisms, or bushings are exchangeably mounted in adjustable supports (8, 14′).
EP19880810027 1987-07-15 1988-01-21 Method and apparatus for machining workpieces Expired - Lifetime EP0299915B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2693/87 1987-07-15
CH269387A CH666436A5 (en) 1987-07-15 1987-07-15 METHOD FOR MACHINING WORKPIECES AND DEVICE FOR CARRYING OUT THIS METHOD.

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EP0299915A1 EP0299915A1 (en) 1989-01-18
EP0299915B1 true EP0299915B1 (en) 1991-07-10

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DE102016006889A1 (en) 2016-06-03 2017-12-07 Vollmer Werke Maschinenfabrik Gmbh Device for supporting a workpiece to be machined

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Publication number Publication date
EP0299915A1 (en) 1989-01-18
DE3863598D1 (en) 1991-08-14
CH666436A5 (en) 1988-07-29

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