EP0257381B1 - Procédé et dispositif pour dresser des meules - Google Patents

Procédé et dispositif pour dresser des meules Download PDF

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Publication number
EP0257381B1
EP0257381B1 EP87111290A EP87111290A EP0257381B1 EP 0257381 B1 EP0257381 B1 EP 0257381B1 EP 87111290 A EP87111290 A EP 87111290A EP 87111290 A EP87111290 A EP 87111290A EP 0257381 B1 EP0257381 B1 EP 0257381B1
Authority
EP
European Patent Office
Prior art keywords
dressing
dressing tool
piezoelectric element
tool
grinding wheel
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.)
Expired
Application number
EP87111290A
Other languages
German (de)
English (en)
Other versions
EP0257381A1 (fr
Inventor
Hans Kurt Tönshoff
Thomas Grabner
Harald Gosebruch
Jürgen Jendryschik
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.)
Saint Gobain Diamantwerkzeuge GmbH and Co KG
Original Assignee
Ernst Winter and Sohn Diamantwekzeuge GmbH and Co
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
Application filed by Ernst Winter and Sohn Diamantwekzeuge GmbH and Co filed Critical Ernst Winter and Sohn Diamantwekzeuge GmbH and Co
Publication of EP0257381A1 publication Critical patent/EP0257381A1/fr
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Publication of EP0257381B1 publication Critical patent/EP0257381B1/fr
Expired legal-status Critical Current

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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
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/001—Devices or means for dressing or conditioning abrasive surfaces involving the use of electric current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces

Definitions

  • the invention relates to a method and a device for dressing grinding wheels with diamond or cubic crystalline boron nitride as an abrasive, with a diamond dressing tool which is connected to a movable machine slide, the feed speed of which can be preset.
  • an electromechanical drive unit is used for the delivery of a dressing tool.
  • An NC control or a CNC control can be used.
  • Such devices are relatively expensive.
  • a major deficiency lies in the fact that the infeed is in many cases not effected as precisely as is desirable, owing to errors which result from mechanical friction and an inadequate rigidity of the output systems.
  • heat influences such as temperature increases in the work area or temperature fluctuations of the grinding wheel can have a disadvantageous effect on the accuracy of the infeed. Since the grinding wheel expands as a result of its heating during use, it is in a different position for a new dressing process after its return to the dressing position than the one in which it was originally dressed at a lower temperature. As a result, previously obtained values for setting the dressing tool cannot be reproduced.
  • a dressing step means the delivery of a dressing tool per dressing process.
  • a total dressing infeed should be two 1 1m, it is advisable to split this size into several individual infeeds of smaller dimensions, such as four individual infeeds of 0.5 1 1m each, since under these conditions much better dressing infeeds can be achieved than with just a larger delivery. In practice, however, this has so far often not been possible, since the allocation system between the grinding wheel and the dressing tool changes continuously, in particular as a result of thermally induced deformations.
  • a dressing result which should be reproducible, therefore requires precise knowledge of the spatial assignment between the grinding wheel and the dressing tool as well as the utilization of a feed system with the highest positioning accuracy. Reproducibility in this context means that it is continuously ensured that, under different external circumstances, the same effect is produced during dressing as in previous dressing processes.
  • the object of the invention is to provide a method and a device for dressing grinding wheels, the use of which can produce reproducible results of the highest accuracy. According to the invention, it is provided that the occurrence of a contact between the dressing tool and the grinding wheel is determined by measuring the electrical voltage of a piezoelectric element connected to the dressing tool and that the extent of further advancement of the dressing tool after the machine slide is stopped by the Applying a certain electrical voltage to the piezoelectric element is determined, the size of which is proportional to the extent of the delivery of the dressing tool.
  • the invention thus makes use of two known piezoelectric effects, namely the knowledge that a piezoelectric material generates an electrical voltage proportional to it when subjected to mechanical stress by external forces, and the knowledge that when an electrical voltage is applied to a piezoelectric crystal or a ceramic that expands.
  • the first finding is used to find the position of the dressing tool in which there is contact with the grinding wheel and the second finding is used to cause the dressing tool to be delivered after reaching a contact position for dressing, the result of which is independent of external influences such as insufficient rigidity of the drive device or temperature differences.
  • piezoelectric elements such as quartz crystals or ceramics
  • a stack enable stretches and thus infeed sizes of several 100ths of a mm to be achieved.
  • one or more stacks of piezoelectric ceramics or crystals can be structurally integrated into the force flow between the dressing tool and the machine slide or the machine frame without great effort, so that the control of the delivery of larger and heavier dressing tools such as Profile dressing rolls can be carried out with maximum accuracy and the use of previously obtained results.
  • piezo elements enable much smaller delivery amounts that are reproducible than conventional electromechanical delivery systems.
  • the reproducibility of the delivery amounts is higher than in conventional delivery systems, since the piezo elements can be coupled directly to the dressing tool, so that position errors resulting from insufficient rigidity of a delivery system or result from the guidance and drive behavior, without influencing the dressing result, since the machine-side feed slide does not have to be moved during dressing or for dressing.
  • the arrangement shown in the drawing has a grinding wheel 1 with a grinding spindle 2, which can be moved back and forth in accordance with the double arrow 3.
  • the grinding wheel 1 rotates according to the arrow 4.
  • a diamond cup wheel 5 is provided, which is connected to a drive spindle 6.
  • the axis of the spindle 6 with the cup wheel 5 is inclined to the axis of the grinding wheel 1.
  • the dressing wheel 5 is connected via a holder 7 to a mounting plate 8, which is part of an adjustable machine slide.
  • the connection is established by a stack 10 of individual piezo elements 9, which can consist of disk-shaped piezo crystals such as quartz crystals.
  • the individual piezo elements 9 lie in a housing 11 which is provided with a connection 13 for two lines 14 and 15.
  • the infeed of the dressing tool 5 before the start of the dressing process takes place via the carriage 8 in the direction of the arrow 12. If there is a contact between the dressing tool 5 and the grinding wheel 1, pressure builds up on the piezo elements 9 which act in the flow of force lie between the dressing tool 5 and the carriage 8 carrying this. This pressure triggers an electrical voltage, which is passed via line 14 to a contactor 16, which opens switch 17 when voltage occurs for the first time and thus interrupts the advance of carriage 8 or its infeed. Immediately afterwards or simultaneously, a voltage can be applied to the piezo elements 9 via a voltage source 18 and the line 15 from outside, which causes their expansion in reverse of the piezo effect described above.
  • the extent of this expansion corresponds to the further infeed of the dressing tool and can be determined precisely in advance by the size of the voltage applied, it having to be taken into account that work is carried out with a high voltage in the order of magnitude of a maximum of approximately 5,000 volts.
  • the arrangement makes it possible, for example, for a total dressing infeed of 2.0 1 1m to carry out 4 individual infeeds of the order of 0.5 11m, in the course of which the grinding wheel 1 is moved back and forth in accordance with the double arrow 3, so that the load on the Dressing tool and the grinding wheel 1 remains relatively low.
  • the dressing tool 5 both rotating dressing tools and standing diamond tools, e.g. B. single diamonds.
  • the axis of the dressing spindle 6 can be perpendicular to the axis of the grinding spindle 2. If larger or heavier dressing tools are used, a plurality of stacks 10 of piezo elements can be arranged between the holder 7 and its carrier 8 in addition to the example shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Claims (4)

1. Procédé pour dresser des meules à diamant ou à nitrure de bore cristallin cubique comme abrasif, avec un outil de dressage diamanté (5), qui est relié à un coulisseau de machine (8) déplaçable, dont la vitesse d'approche est préréglable et pour lequel l'entrée en contact de l'outil de dressage (5) avec la meule (1) est détectée par la mesure de la tension électrique d'un élément piézoélectrique (9) relié à l'outil de dressage (5), caractérisé en ce que l'ampleur de la poursuite de l'approche de l'outil de dressage (5), après un arrêt du coulisseau de machine (8), est déterminé par l'application d'une tension électrique à l'élément piézoélectrique (9).
2. Procédé selon la revendication 1, caractérisé en ce que l'ampleur de l'approche de l'outil de dressage (5) est réalisée par une augmentation graduelle de la tension électrique appliquée à l'élément piézoélectrique (9).
3. Dispositif pour dresser des meules avec un outil de dressage diamanté et avec un élément piézoélectrique (9) qui est placé dans le flux de force entre l'outil de dressage (5) et son coulisseau de machine (8) et qui indique, au moyen d'un dispositif capteur de force (16), le contact de l'outil de dressage (5) avec la meule (1), caractérisé en ce que l'ampleur de l'approche de l'outil de dressage, lors du dressage, est déterminée par l'application d'une tension électrique correspondante provenant d'une source de tension (18) à l'élément piézoélectrique (9).
4. Dispositif selon la revendication 3, caractérisé en ce que plusieurs piles (10) composées d'éléments piézoélectriques (9) sont placées dans le flux de force entre le support (7) de l'outil de dressage (5) et le coulisseau de machine (8).
EP87111290A 1986-08-19 1987-08-05 Procédé et dispositif pour dresser des meules Expired EP0257381B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863628143 DE3628143A1 (de) 1986-08-19 1986-08-19 Verfahren und vorrichtung zum abrichten von schleifscheiben
DE3628143 1986-08-19

Publications (2)

Publication Number Publication Date
EP0257381A1 EP0257381A1 (fr) 1988-03-02
EP0257381B1 true EP0257381B1 (fr) 1989-12-20

Family

ID=6307729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111290A Expired EP0257381B1 (fr) 1986-08-19 1987-08-05 Procédé et dispositif pour dresser des meules

Country Status (3)

Country Link
US (1) US4799472A (fr)
EP (1) EP0257381B1 (fr)
DE (2) DE3628143A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5025594A (en) * 1988-09-02 1991-06-25 Cincinnati Milacron-Heald Corp. Method and apparatus for controlling grinding processes
US5042206A (en) * 1988-09-02 1991-08-27 Cincinnati Milacron-Heald Corp. Method and apparatus for controlling grinding processes
US5044125A (en) * 1988-09-02 1991-09-03 Cincinnati Milacron-Heald Corp. Method and apparatus for controlling grinding processes
DE4008249A1 (de) * 1989-03-17 1990-09-27 Michael Dipl Ing Zinngrebe Verfahren und vorrichtung zum definierten abrichten von cbn-schleifscheiben
EP0476448B1 (fr) * 1990-09-20 1996-05-08 Toyoda Koki Kabushiki Kaisha Machine-outil à meuler d'une pièce avec une machine à dresser
US5170103A (en) * 1991-05-20 1992-12-08 University Of Kentucky Research Foundation Active vibration control device
JP3052190B2 (ja) * 1996-05-23 2000-06-12 セイコー精機株式会社 砥石の修正方法およびその装置
CA2339097C (fr) 1998-07-31 2007-07-31 Norton Company Outil de dressage rotatif contenant une couche de diamant brasee
US20050260939A1 (en) * 2004-05-18 2005-11-24 Saint-Gobain Abrasives, Inc. Brazed diamond dressing tool
RU2621495C1 (ru) * 2015-12-08 2017-06-06 Федеральное государственное казенное военное образовательное учреждение высшего профессионального образования Рязанское высшее воздушно-десантное командное училище (военный институт) имени генерала армии В.Ф. Маргелова МО РФ Способ повышения точности и производительности круглого наружного шлифования

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118139A (en) * 1963-01-11 1978-10-03 Lemelson Jerome H Machine tool and method
GB1197076A (en) * 1966-08-11 1970-07-01 Toyoda Machine Works Ltd A Feed Control Device with a Safety System
US4199902A (en) * 1978-07-17 1980-04-29 Sauerland Franz L Apparatus for automatic lapping control
US4359841A (en) * 1979-11-08 1982-11-23 Trw Inc. Grinding wheel wear detection and dressing method
DE3233609A1 (de) * 1982-09-10 1984-03-15 Ernst Winter & Sohn ( GmbH & Co.), 2000 Hamburg Verfahren und vorrichtung zum schaerfen einer schleifscheibe
DE3509240A1 (de) * 1985-03-14 1986-09-18 Traub GmbH Maschinenfabrik, 7313 Reichenbach Antriebseinrichtung fuer eine werkzeugschneide

Also Published As

Publication number Publication date
US4799472A (en) 1989-01-24
EP0257381A1 (fr) 1988-03-02
DE3761184D1 (de) 1990-01-25
DE3628143A1 (de) 1988-02-25

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