EP0328107A2 - Method and apparatus for the CNC grinding of decorative surfaces, decorative grooves or the like - Google Patents

Method and apparatus for the CNC grinding of decorative surfaces, decorative grooves or the like Download PDF

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Publication number
EP0328107A2
EP0328107A2 EP89102246A EP89102246A EP0328107A2 EP 0328107 A2 EP0328107 A2 EP 0328107A2 EP 89102246 A EP89102246 A EP 89102246A EP 89102246 A EP89102246 A EP 89102246A EP 0328107 A2 EP0328107 A2 EP 0328107A2
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Prior art keywords
grinding
workpiece
tool
decorative
regrinding
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EP89102246A
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German (de)
French (fr)
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EP0328107A3 (en
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Wilhelm König
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—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 according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B24B19/03—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for grinding grooves in glass workpieces, e.g. decorative grooves

Definitions

  • the invention relates to a method and a machine for the CNC-controlled grinding of decorative surfaces, decorative grooves or the like on hollow glasses or the like, according to the preambles of claims 1 and 2.
  • the object of the invention is to provide a method and a machine with which dimensionally identical decorative patterns can be achieved automatically even with glasses which deviate considerably from their target contour.
  • the hollow glass 11 to be ground is held in the machine by means of a pivotable workpiece holder 1. 1, the grinding tool 2 moves on a path 3 preprogrammed according to the desired value of the decoration to be ground on the glass into the position 4 shown in broken lines.
  • a piston-cylinder unit 6 is used the pivotable workpiece holder 1 and thus the workpiece 11 are pressed against the grinding tool 2, the pressure in the piston-cylinder unit 6 being set to a specific value.
  • This pressure corresponds to a desired machining of the first pre-grinding tool (grinding tool 2), which is designed in such a way that the smallest possible machining deviations occur over the period of use, since this grinding cycle is intended to serve more for sensing the surface and for careful preparation for the following grinding process.
  • the actual surface is felt in such a way that when there is a contour deviation of the workpiece 11 from the target contour, the counterpressure in the piston-cylinder unit 6 is overcome, and thus there is evasion or pushing against it the grinding wheel 2.
  • the rest may be identical to the tool 2 used in the pre-grinding, moves into the position 9 during the further processing of the pre-processed decorative surfaces on a path 8 corrected according to the actual contour of the respective glass 11.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

Die Erfindung betrifft ein Verfahren und eine Maschi­ne zum CNC-gesteuerten Schleifen von Dekorflächen der dergleichen an relativ große Abweichungen von der Sollform aufweisenden Werkstücken aus Glas, wie Hohl­gläser oder dergleichen, wobei das Schleifen jeder Dekorfläche in einem Vorschliff und mindestens einem Nachschliff erfolgt. Um dabei trotz der teilweise er­heblich von der Sollform abweichenden Gläser gleich­mäßige Dekorflächen zu erzielen, kann beim Vorschliff das Schleifwerkzeug (2) oder das Werkstück (11) bei Über­schreiten eines vorwählbaren Schleifdruckgrenzwertes in Zustellrichtung, unabhängig von der Zustellein­richtung zurückweichen. Dadurch auftretende Abwei­chungen der Lage des Eingriffpunktes zwischen Werk­zeug (2) und Werkstück (11) werden meßtechnisch erfaßt und in der Steuerung als beim Nachschliff, bei dem die Aus­weichmöglichkeit des Schleifwerkzeugs (2) oder Werkstücks (11) dann blockiert wird, zu berücksichtigende Korrektur­werte gespeichert.

Figure imgaf001
The invention relates to a method and a machine for the CNC-controlled grinding of decorative surfaces of the like to relatively large deviations from the desired shape of workpieces made of glass, such as hollow glasses or the like, the grinding of each decorative surface being carried out in a preliminary grinding and at least one regrinding. In order to achieve uniform decorative surfaces in spite of the glasses, which sometimes differ considerably from the target shape, the grinding tool (2) or the workpiece (11) can recede in the infeed direction during pre-grinding if a preselectable grinding pressure limit value is exceeded, regardless of the infeed device. Any deviations in the position of the point of engagement between the tool (2) and the workpiece (11) that occur as a result are recorded by measurement technology and correction values to be taken into account are stored in the control system as during regrinding, in which the possibility of the grinding tool (2) or workpiece (11) then being blocked is blocked .
Figure imgaf001

Description

Die Erfindung betrifft ein Verfahren und eine Maschi­ne zum CNC-gesteuerten Schleifen von Dekorflächen, Dekornuten oder dergleichen an Hohlgläsern oder dergleichen, nach den Oberbegriffen der Ansprüche 1 und 2.The invention relates to a method and a machine for the CNC-controlled grinding of decorative surfaces, decorative grooves or the like on hollow glasses or the like, according to the preambles of claims 1 and 2.

Hohlgläser, insbesondere mundgeblasene Gläser, sind in ihren Abmessungen, bedingt durch die Art ihrer Herstellung, unvermeidlich mit großen Toleranzen be­haftet, die eine Automatisierung beim Dekorschleifen erheblich erschweren. Bislang suchte man diese Gege­benheiten dadurch zu berücksichtigen, daß man entwe­der das Werkzeug oder das Werkstück in der Maschine flexibel anordnete und den Schleifvorgang nur über den Schleifdruck steuerte. Zufriedenstellend gleich­mäßige Dekorschliffe erhält man hierbei jedoch allen­falls solange, als sich die Schneidfähigkeit des Schleifwerkzeugs nicht wesentlich ändert, was von der Bedienungsperson der Maschine demgemäß ständig über­wacht werden muß. Trotzdem treten jedoch immer wieder erhebliche Schliffabweichungen auf, was im übrigen dann weitere Schwierigkeiten bereitet, wenn es sich dabei um Vorschliffe handelt, die noch weiterbearbei­tet, das heißt feingeschliffen und/oder poliert werden müssen.
Aufgabe der Erfindung ist es demgegenüber, ein Ver­fahren und eine Maschine anzugeben, mit denen sich auch bei erheblich von ihrer Sollkontur abweichenden Gläsern automatisch maßlich gleiche Dekormuster er­zielen lassen.Hollow glasses, in particular mouth-blown glasses, are inevitably fraught with large tolerances due to the way they are manufactured, which make automation of decorative grinding considerably more difficult. Until now, efforts have been made to take these conditions into account by flexibly arranging either the tool or the workpiece in the machine and controlling the grinding process only by means of the grinding pressure. Satisfactorily uniform decorative cuts can be obtained, however, as long as the cutting ability of the grinding tool does not change significantly, which must accordingly be constantly monitored by the operator of the machine. Nevertheless, considerable grinding deviations occur again and again, which, moreover, creates further difficulties when it comes to pre-grinding that still has to be further processed, that is to say finely ground and / or polished.
In contrast, the object of the invention is to provide a method and a machine with which dimensionally identical decorative patterns can be achieved automatically even with glasses which deviate considerably from their target contour.

Die Lösung dieser Aufgabe ergibt sich bei dem im Oberbegriff des Anspruchs 1 als bekannt vorausgesetz­ten Verfahren und bei der im Oberbegriff des An­spruchs 2 beschriebenen Maschine aus den in den Kenn­zeichen der Ansprüche 1 und 2 enthaltenen Merkmalen. Das erfindungsgemäße Verfahren und die Maschine zu seiner Durchführung ermöglichen, daß beim Dekor­schleifen, einerseits trotz entsprechend den Sollab­maßen der Glasrohlinge festprogrammierter Zustellwer­te und andererseits trotz der bei den einzelnen Glä­sern willkürlich auftretenden erheblichen Abweichun­gen von ihrer Sollkontur, die Schlifftiefe beim Vor­schliff bestimmte zulässige Werte nicht überschreitet und auch beim Nachschleifen diese Konturabweichungen berücksichtigt werden, so daß an den fertigge­schliffenen Gläsern die Dekore, unabhängig von den Istkonturen der Gläserrohlinge, alle im wesentlichen gleiche Maße und damit auch gleiches Aussehen haben. Dies ist vor allem auch dann von Bedeutung, wenn De­kornuten oder auch sogenannte Oliven geschliffen wer­den, da unterschiedlich tiefe Nuten besonders auffäl­lig sind und zudem dabei überhaupt leicht Ausschuß entstehen kann, indem das Glas durchgeschliffen wird.This object is achieved in the method which is assumed to be known in the preamble of claim 1 and in the machine described in the preamble of claim 2 from the features contained in the characteristics of claims 1 and 2. The method according to the invention and the machine for its implementation enable the grinding depth during pre-grinding not to exceed certain permissible values during decorative grinding, on the one hand despite the programmed delivery values corresponding to the target dimensions of the glass blanks and on the other hand despite the considerable deviations from their target contour that occur arbitrarily for the individual glasses these contour deviations are also taken into account when regrinding, so that the decors on the finished glass, regardless of the actual contours of the glass blanks, all have essentially the same dimensions and thus also the same appearance. This is especially important when decorating grooves or so-called olives are ground, because grooves of different depths are particularly noticeable and, in addition, rejects can easily arise by grinding the glass.

Die Erfindung wird nachfolgend anhand der schematisch ein Ausführungsbeispiel darstellenden Zeichnung noch näher erläutert.The invention is explained in more detail below with reference to the drawing schematically illustrating an exemplary embodiment.

Dabei zeigt:

  • Fig. 1 den Dekor-Vorschliff eines Hohl­glases
    und
  • Fig. 2 den oder die Dekor-Nachschlif­f(e) unter Verwendung einer er­findungsgemäßen Maschine.
It shows:
  • Fig. 1 shows the decorative pre-grinding of a hollow glass
    and
  • Fig. 2 or the decorative regrinding (s) using a machine according to the invention.

Das zu schleifende Hohlglas 11 ist in der Maschine mittels einer schwenkbaren Werkstückaufnahme 1 gehal­ten. Beim Vorschliff gemäß Fig. 1 bewegt sich das Schleifwerkzeug 2 auf einer entsprechend dem Sollwert des am Glas zu schleifenden Dekors vorprogrammierten Bahn 3 in die strichliert dargestellte Position 4. Um nun die Konturabweichungen der einzelnen Gläser von deren Sollkontur zu berücksichtigen, wird mittels ei­ner Kolbenzylindereinheit 6 die schwenkbare Werk­stückaufnahme 1 und damit das Werkstück 11 gegen das Schleifwerkzeug 2 gedrückt, wobei der Druck in der Kolbenzylindereinheit 6 auf einen bestimmten Wert eingestellt ist. Dieser Druck entspricht einer ge­wünschten Zerspanung des ersten Vorschliffwerkzeugs (Schleifwerkzeug 2), welches so gestaltet ist, daß möglichst geringe Zerspanungsabweichungen über die Einsatzdauer entstehen, da dieser Schleifgang mehr der Ertastung der Oberfläche und der schonenden Vor­bereitung auf den folgenden Schleifvorgang bedienen soll. Die Ertastung der Ist-Oberfläche erfolgt so, daß es beim Schleifen bei Konturabweichungen des Werkstücks 11 von der Sollkontur zu einem Überwinden des Gegendrucks in der Kolbenzylindereinheit 6 kommt und damit zum Ausweichen oder Nachschieben gegenüber der Schleifscheibe 2. Diese dann auftretenden Bewe­gungen des Werkstücks 11 bzw. der Werkstückaufnahme 1 werden gleichzeitig von einem Wegmeßsystem 5 erfaßt und in der Steuerung der Maschine gespeichert. Die weiteren Bearbeitungsvorgänge erfolgen dann gemäß Fig. 2, mit von der Kolbenzylindereinheit 6 gegen ei­nen Anschlag 10 arretierter Werkstückaufnahme 1 unter Berücksichtigung der beim Vorschliff an jedem Glas gemessenen und in der Maschine gespeicherten indivi­duellen Abweichungen, d.h. das beim Nachschliff ver­wendete Werkzeug 7, das im übrigen identisch mit dem beim Vorschliff verwendeten Werkzeug 2 sein kann, be­wegt sich bei der Weiterbearbeitung der vorbearbei­teten Dekorflächen auf einer entsprechend der Istkon­tur des jeweiligen Glases 11 korrigierten Bahn 8 in die Posistion 9.The hollow glass 11 to be ground is held in the machine by means of a pivotable workpiece holder 1. 1, the grinding tool 2 moves on a path 3 preprogrammed according to the desired value of the decoration to be ground on the glass into the position 4 shown in broken lines. In order to take into account the contour deviations of the individual glasses from their desired contour, a piston-cylinder unit 6 is used the pivotable workpiece holder 1 and thus the workpiece 11 are pressed against the grinding tool 2, the pressure in the piston-cylinder unit 6 being set to a specific value. This pressure corresponds to a desired machining of the first pre-grinding tool (grinding tool 2), which is designed in such a way that the smallest possible machining deviations occur over the period of use, since this grinding cycle is intended to serve more for sensing the surface and for careful preparation for the following grinding process. The actual surface is felt in such a way that when there is a contour deviation of the workpiece 11 from the target contour, the counterpressure in the piston-cylinder unit 6 is overcome, and thus there is evasion or pushing against it the grinding wheel 2. These then occurring movements of the workpiece 11 or the workpiece holder 1 are simultaneously detected by a position measuring system 5 and stored in the control of the machine. The further machining operations then take place according to FIG. 2, with the workpiece holder 1 locked by the piston-cylinder unit 6 against a stop 10, taking into account the individual deviations measured on the glass during pre-grinding and stored in the machine, ie the tool 7 used during regrinding, the rest may be identical to the tool 2 used in the pre-grinding, moves into the position 9 during the further processing of the pre-processed decorative surfaces on a path 8 corrected according to the actual contour of the respective glass 11.

Claims (2)

1. Verfahren zum CNC-gesteuerten Schleifen von Dekor­flächen, Dekornuten oder dergleichen an Hohlglä­sern oder dergleichen, bei dem das Schleifen jedes Dekors in mindestens zwei Schritten, einem Vor­schliff und mindestens einem Nachschliff erfolgt, dadurch gekennzeichnet, daß beim Vorschliff die Schlifftiefe dadurch unabhängig von den von der Maschinensteuerung vorgegebenen Zustellwerten auf einen bestimmten Maximalwert begrenzt wird, daß das Schleifwerkzeug oder das Werkstück bei Über­schreiten eines vorwählbaren Schleifdruckgrenzwer­tes, unabhängig von der Zustelleinrichtung, in Zu­stelleinrichtung zurückweichen kann, daß dadurch auftretende Abweichungen des Eingriffpunktes zwi­schen Werkzeug und Werkstück von den von der Steu­erung vorgegebenen Sollwerten gleichzeitig gemes­sen kund in der Steuerung als beim Nachschleifen zu berücksichtigende Korrekturwerte gespeichert werden und daß beim Nachschleifen die Ausweichmög­lichkeit des Schleifwerkzeuges oder Werkstücks in Zustellrichtung arretiert ist.1. A method for the CNC-controlled grinding of decorative surfaces, decorative grooves or the like on hollow glasses or the like, in which the grinding of each decor is carried out in at least two steps, a preliminary grinding and at least one regrinding, characterized in that the grinding depth is thereby independent of the The infeed values specified by the machine control system are limited to a specific maximum value so that the grinding tool or the workpiece can recede into the infeed device if a preselectable grinding pressure limit value is exceeded, regardless of the fact that the engagement point between tool and workpiece deviates from those specified by the control system Setpoints measured at the same time are saved in the control system as correction values to be taken into account during regrinding and that during regrinding the possibility of avoiding the grinding tool or workpiece locks in the feed direction is. 2. CNC-gesteuerte Schleifmaschine zum Durchführen des Verfahrens nach Anspruch 1, mit einem Maschinenge­stell, mindestens einer diesem gegenüber bezüglich ihrer Lage im Raum gesteuert verfahrbaren Schleif­scheibe, einer schwenkbar gelagerten Werkstückauf­nahme und einer an dieser mit einer voreinstellba­ren Kraft angreifenden Kolbenzylindereinheit, ge­kennzeichnet durch ein Schwenkbewegungen der Werk­stückaufnahme (1) beim Vorschliff erfassendes Weg­meßsystem (5) und einen Anschlag (10), gegen den beim Nachschliff die Werkstückaufnahme (1) mittels der Kolbenzylindereinheit (6) arretierbar ist.2. CNC-controlled grinding machine for performing the method according to claim 1, with a machine frame, at least one relative to this with respect to its position in space controlled movable grinding wheel, a pivotally mounted workpiece holder and a piston cylinder unit acting on this with a pre-adjustable force, characterized by a pivoting movement the workpiece holder (1) during pre-grinding measuring system (5) and a stop (10) against which the workpiece holder (1) can be locked by means of the piston-cylinder unit (6) during regrinding.
EP19890102246 1988-02-09 1989-02-09 Method and apparatus for the cnc grinding of decorative surfaces, decorative grooves or the like Withdrawn EP0328107A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883803855 DE3803855C1 (en) 1988-02-09 1988-02-09
DE3803855 1988-02-09

Publications (2)

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EP0328107A2 true EP0328107A2 (en) 1989-08-16
EP0328107A3 EP0328107A3 (en) 1990-11-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6769964B2 (en) 2002-08-02 2004-08-03 Saint-Cobain Abrasives Technology Company Abrasive tool having a unitary arbor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3269233A (en) * 1963-05-22 1966-08-30 Dorries A G O Control arrangement and method
GB1127434A (en) * 1964-12-01 1968-09-18 Churchill Machine Tool Co Ltd Improvements in grinding machines
DE1805667A1 (en) * 1968-10-28 1970-05-21 Walter Frank Device for grinding glass plates or the like.
JPS5316949B2 (en) * 1973-09-17 1978-06-05
DE2821843B1 (en) * 1978-05-19 1979-10-18 Heidenhain Gmbh Dr Johannes Numerical control
DE2924570C2 (en) * 1979-06-19 1984-10-04 Walter Pöting Ingenieurbüro GmbH & Co KG, 4006 Erkrath Machine for the production of decorative cuts on hollow glasses
DE3520713A1 (en) * 1985-06-10 1986-12-11 Fa. Peter Wolters, 2370 Rendsburg CONTROL DEVICE FOR MACHINING PRESSURE ON LAEPP, HONING AND POLISHING MACHINES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6769964B2 (en) 2002-08-02 2004-08-03 Saint-Cobain Abrasives Technology Company Abrasive tool having a unitary arbor

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Publication number Publication date
EP0328107A3 (en) 1990-11-07
DE3803855C1 (en) 1989-03-16

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