EP0995548B1 - Verfahren und Vorrichtung zum Schleifen von Linsen - Google Patents

Verfahren und Vorrichtung zum Schleifen von Linsen Download PDF

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Publication number
EP0995548B1
EP0995548B1 EP99402580A EP99402580A EP0995548B1 EP 0995548 B1 EP0995548 B1 EP 0995548B1 EP 99402580 A EP99402580 A EP 99402580A EP 99402580 A EP99402580 A EP 99402580A EP 0995548 B1 EP0995548 B1 EP 0995548B1
Authority
EP
European Patent Office
Prior art keywords
grinding
grinding wheels
temperature
function
blank
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 - Lifetime
Application number
EP99402580A
Other languages
English (en)
French (fr)
Other versions
EP0995548A1 (de
Inventor
Jean-Jacques Bernard Francis Videcoq
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.)
Briot International SA
Original Assignee
Briot International SA
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
Priority claimed from FR9813334A external-priority patent/FR2784921A1/fr
Application filed by Briot International SA filed Critical Briot International SA
Publication of EP0995548A1 publication Critical patent/EP0995548A1/de
Application granted granted Critical
Publication of EP0995548B1 publication Critical patent/EP0995548B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • 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
    • B24B49/14—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 temperature during grinding

Definitions

  • the present invention relates to a method and a machine for grinding of an optical glass, of the type in which it is made rotate a glass blank around an axis of rotation parallel to the axis of a train of grinding wheels, and we adjust the distance between the two axes depending on the position angular of the draft.
  • the invention aims to improve the accuracy of the grinding to reduce the number of touch-ups required. To this end, it relates to a process of the aforementioned type, characterized in that a temperature influencing said distance, and the setting of this distance is corrected depending on the measured temperature.
  • Claims 2-8 represent modes of advantageous implementation of the method of the invention.
  • the invention is based on the following observation.
  • the cutting lubricant used for the grinding wheels is some water.
  • the temperature rise is moderate. Indeed, the relatively constant network water temperature allows to cool the machine and to dissipate the calories.
  • the water temperature rises according to the rate of use of the machine.
  • the water ends up heating the machine and helps to distribute the heat within it.
  • the invention also relates to a machine for grinding of optical glasses intended for the implementation of a such process.
  • This machine comprising a frame which carries a train of grindstones driven by a motor, a carriage fitted of a roughing shaft parallel to the axis of the undercarriage grinding wheels, means for driving said shaft in rotation, and means for adjusting the distance between this tree and the axis of the wheel train as a function of the position angular of said tree, is characterized in that it includes a temperature sensor suitable for measuring a temperature influencing said distance, and means for correct the setting of this distance according to the measured temperature.
  • Claims 10-13 represent modes of advantageous embodiment of the machine of the invention.
  • the machine shown in the drawings is intended for grind a draft of spectacle lens 1 initially circular. It includes: a frame 2 fixed above a water tank 3; a metal grinding wheel chassis 4 fixed to the frame 2; a train of grinding wheels 5 whose shaft, indicated by its axis X-X, journalled in chassis 4 and is driven by an electric motor 6; a carriage 7; and a computer 8 of control of the grinding process.
  • the chassis 4 has the shape of a bowl ( Figures 1 and 2) the bottom of which has a downward pipe 9. On it is fitted a tube 10 which extends downwards up to tray 3. The latter is fitted with a pump 11 whose discharge is connected, via a line 12, to a spray nozzle 13 located in the vicinity of the region of grinding. Thus is formed a closed liquid circuit lubricant, as shown by arrows in Figure 2.
  • the carriage 7 has a base 14 integral with a cylinder rod 15 parallel to the axis X-X.
  • the cart is guided on the frame 2 by suitable longitudinal members (not shown).
  • a adjustment rod 16 actuated by a pinion 17, which is secured to the output shaft of another electric motor 18.
  • a blank support arm 19 is articulated by a end on base 14 and rests on its other end on rod 16 ( Figure 3).
  • This arm carries two half-shafts 20 Y-Y axis parallel to the X-X axis, between which is clamped the glass blank 1.
  • the half-shafts 20 are driven to low speed rotation by a third motor 21.
  • a temperature sensor 22 is coupled thermally to chassis 4, which has thermal inertia close to that of the wheel train.
  • the output signals of this sensor are transmitted to computer 8 via a line 23, and the computer also receives, via a line 24, signals representative of the angular position ⁇ of the half shafts 20 and therefore of the draft.
  • the computer controls the motor 18, and therefore the level of the rod 16, and therefore the distance between the axes Y-Y and X-X, via a line 25.
  • the rod 16 is raised to the maximum, and the blank is clamped between the half-shafts 20. By action on the rod 15, the blank is brought to the right of a specific wheel and is correctly indexed.
  • the grindstone train is started, as well as the pump 11.
  • the shape of the grinding glass is stored in the computer 8.
  • FIG. 4 shows the results obtained on a machine manufactured by the Applicant: R is a function substantially linear, decreasing, of temperature T.
  • the curve thus obtained is stored in the computer 8, and the latter correspondingly corrects the distance d between the axes YY and XX.
  • This distance is therefore a function of both the angle ⁇ and the temperature T.
  • the temperature is also memorized during the initial setting of the machine, and, from the drift curve of the dimension R, l the computer corrects the distance between the axes YY and XX as a function of the differential ⁇ T between the instantaneous temperature measured by the sensor 22 and the temperature memorized during the initial adjustment of the machine.
  • the measured temperature is that grinding wheel frame 4, which is located nearby wheel train immediately and has thermal inertia close to that of this train of millstones.
  • the glass is ground to a dimension slightly too large, and it comes down to the exact size desired after cooling to ambient temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (13)

  1. Verfahren zum Schleifen von optischen Gläsern, bei dem man einen Glasrohling (1) um eine zur Achse (X-X) eines Schleifkörpersatzes (5) parallele Rotationsachse (Y-Y) drehen lässt und den Abstand (d) zwischen den beiden Achsen in Abhängigkeit von der Winkelstellung () des Rohlings einstellt, dadurch gekennzeichnet, dass man (bei 22) eine diesen Abstand beeinflussende Temperatur misst und die Einstellung dieses Abstands in Abhängigkeit von der gemessenen Temperatur korrigiert.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die gemessene Temperatur die eines dem Schleifkörpersatz (5) benachbarten mechanischen Teils (4) ist, dessen.thermische Trägheit der dieses Schleifkörpersatzes nahe ist.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass das mechanische Teil (4) ein Schleifkörpertragchassis ist.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass man zuvor empirisch die Kurve der Änderung des Radius (R) des geschliffenen Rohlings für mindestens eine Winkelstellung von ihm in Abhängigkeit von der gemessenen Temperatur erstellt und diese Kurve in dem Speicher eines Rechners (8) zur Steuerung des Schleifvorgangs speichert.
  5. Verfahren nach Anspruch 4 insbesondere zum Schleifen von organischen Gläsern, dadurch gekennzeichnet, dass man diesen Radius (R) nach Abkühlen des geschliffenen Rohlings auf Raumtemperatur misst.
  6. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass man diese Korrektur ausgehend von der Kurve der Änderung des Radius (R1) der Schleifkörper in Abhängigkeit von der gemessenen Temperatur durchführt.
  7. Verfahren nach einem der Ansprüche 1 bis 3 insbesondere zum Schleifen von organischen Gläsern, dadurch gekennzeichnet, dass man diese Korrektur ausgehend von der Kurve der kumulierten Änderung in Abhängigkeit von der gemessenen Temperatur, vom Radius (R1) der Schleifkörper und vom Radius (R2) des Ausgangsrohlings durchführt.
  8. Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass man diese Korrektur ausgehend von dieser Kurve in Abhängigkeit von dem Unterschied zwischen der gemessenen Temperatur und der bei der Anfangseinstellung dieses Abstands (d) gemessenen Temperatur durchführt, wobei die letztgenannte Temperatur gespeichert wurde.
  9. Maschine zum Schleifen von optischen Gläsern, die ein Gestell (2) aufweist, das einen von einem Motor (6) angetriebenen Schleifkörpersatz (5), einen Wagen (7), der mit einer zur Achse (X-X) des Schleifkörpersatzes parallelen Rohlingtragwelle (20) versehen ist, Mittel (21) zum Drehantrieb dieser Welle (20) und Mittel (8, 16 bis 18, 25) zum Einstellen des Abstands (d) zwischen dieser Welle und der Achse (X-X) des Schleifkörpersatzes in Abhängigkeit von der Winkelstelung () dieser Welle trägt, dadurch gekennzeichnet, dass sie einen Temperaturfühler (22) besitzt, der dafür ausgelegt ist, eine diesen Abstand beeinflussende Temperatur zu messen, sowie Mittel zum Korrigieren der Einstellung dieses Abstands in Abhängigkeit von der gemessenen Temperatur.
  10. Maschine nach Anspruch 9, dadurch gekennzeichnet, dass der Temperaturfühler (22) mit einem dem Schleifkörpersatz (5) benachbarten mechanischen Teil (4) thermisch gekoppelt ist, dessen thermische Trägheit nahe der dieses Schleifkörpersatzes ist.
  11. Maschine nach Anspruch 10, dadurch gekennzeichnet, dass das mechanische Teil (4) ein Schleifkörpertragchassis ist.
  12. Maschine nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, dass sie einen geschlossenen Schleifschmierflüssigkeitskreis (9 bis 13) aufweist.
  13. Maschine nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, dass sie einen Steuerrechner (8) aufweist, der eine Kurve der Änderung des Radius (R) des geschliffenen Rohlings in Abhängigkeit von der gemessenen Temperatur für mindestens eine Winkelstellung von diesem und/oder des Radius (R1) der Schleifkörper und/oder des Radius (R2) des Ausgangsrohlings gespeichert hat.
EP99402580A 1998-10-23 1999-10-19 Verfahren und Vorrichtung zum Schleifen von Linsen Expired - Lifetime EP0995548B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9813334 1998-10-23
FR9813334A FR2784921A1 (fr) 1998-10-23 1998-10-23 Procede et machine de meulage de verres optiques
FR9902919 1999-03-09
FR9902919A FR2784922B1 (fr) 1998-10-23 1999-03-09 Procede et machine de meulage de verres optiques

Publications (2)

Publication Number Publication Date
EP0995548A1 EP0995548A1 (de) 2000-04-26
EP0995548B1 true EP0995548B1 (de) 2002-08-14

Family

ID=26234615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99402580A Expired - Lifetime EP0995548B1 (de) 1998-10-23 1999-10-19 Verfahren und Vorrichtung zum Schleifen von Linsen

Country Status (5)

Country Link
EP (1) EP0995548B1 (de)
DE (1) DE69902507T2 (de)
ES (1) ES2182467T3 (de)
FR (1) FR2784922B1 (de)
IL (1) IL132492A (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5347762A (en) * 1992-02-04 1994-09-20 Nidek Co., Ltd. Lens periphery processing apparatus, method for obtaining processing data, and lens periphery processing method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287018A (en) * 1979-05-07 1981-09-01 Corning Glass Works Method for finishing glass-plastic laminated lens blanks
US5795212A (en) * 1995-10-16 1998-08-18 Byelocorp Scientific, Inc. Deterministic magnetorheological finishing

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5347762A (en) * 1992-02-04 1994-09-20 Nidek Co., Ltd. Lens periphery processing apparatus, method for obtaining processing data, and lens periphery processing method

Also Published As

Publication number Publication date
IL132492A0 (en) 2001-03-19
DE69902507D1 (de) 2002-09-19
IL132492A (en) 2003-06-24
ES2182467T3 (es) 2003-03-01
FR2784922B1 (fr) 2001-02-09
FR2784922A1 (fr) 2000-04-28
DE69902507T2 (de) 2003-05-28
EP0995548A1 (de) 2000-04-26

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