EP0995548B1 - Procédé et machine de meulage de verres optiques - Google Patents
Procédé et machine de meulage de verres optiques Download PDFInfo
- 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
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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)
Description
- l'échauffement de l'électronique et des moteurs embarqués;
- l'échauffement des outils de coupe (meules) et du lubrifiant de coupe.
- La Figure 1 est une vue schématique de face, avec coupe partielle, des parties pertinentes d'une machine de meulage conforme à l'invention;
- la Figure 2 est. une vue schématique prise en coupe suivant la ligne II-II de la Figure 1;
- la Figure 3 est une vue schématique prise en coupe suivant la ligne III-III de la Figure 1;
- la Figure 4 est un diagramme qui illustre la modification de cote du verre après meulage en fonction de la température; et
- les Figures 5 à 7 sont des diagrammes analogues correspondant à une variante.
Claims (13)
- Procédé de meulage de verres optiques, du type dans lequel on fait tourner une ébauche de verre (1) autour d'un axe de rotation (Y-Y) parallèle à l'axe (X-X) d'un train de meules (5), et on règle la distance (d) entre les deux axes en fonction de la position angulaire () de l'ébauche, caractérisé en ce qu'on mesure (en 22) une température influant sur ladite distance, et on corrige le réglage de cette distance en fonction de la température mesurée.
- Procédé suivant la revendication 1, caractérisé en ce que la température mesurée est celle d'une pièce mécanique (4) voisine du train de meules (5) et dont l'inertie thermique est voisine de celle de ce train de meules.
- Procédé suivant la revendication 2, caractérisé en ce que ladite pièce mécanique (4) est un châssis porte-meules.
- Procédé suivant l'une quelconque des revendications 1 à 3, caractérisé en ce qu'on établit au préalable, de façon empirique, la courbe de variation du rayon (R) de l'ébauche meulée, pour au moins une position angulaire de celle-ci, en fonction de la température mesurée, et on mémorise cette courbe dans la mémoire d'un ordinateur (8) de commande du processus de meulage.
- Procédé suivant la revendication 4, notamment pour le meulage de verres organiques, caractérisé en ce qu'on mesure ledit rayon (R) après refroidissement à la température ambiante de l'ébauche meulée.
- Procédé suivant l'une quelconque des revendications 1 à 3, caractérisé en ce qu'on effectue ladite correction à partir de la courbe de variation du rayon (R1) des meules en fonction de la température mesurée.
- Procédé suivant l'une quelconque des revendications 1 à 3, notamment pour le meulage de verres organiques, caractérisé en ce qu'on effectue ladite correction à partir de la courbe de variation cumulée, en fonction de la température mesurée, du rayon (R1) des meules et du rayon (R2) de l'ébauche de départ.
- Procédé suivant l'une quelconque des revendications 4 à 7, caractérisé en ce qu'on effectue ladite.correction, à partir de ladite courbe, en fonction du différentiel entre la température mesurée et la température mesurée lors du réglage initial de ladite distance (d), cette dernière température ayant été mémorisée.
- Machine de meulage de verres optiques, du type comprenant un bâti (2) qui porte un train de meules (5) entraíné par un moteur (6), un chariot(7) muni d'un arbre porte-ébauche (20) parallèle à l'axe (X-X) du train de meule, des moyens (21) d'entraínement en rotation dudit arbre (20), et des moyens (8, 16 à 18, 25) pour régler la distance (d) entre cet arbre et l'axe (X-X) du train de meules en fonction de la position angulaire () dudit arbre, caractérisée en ce qu'elle comprend un capteur de température (22) adapté pour mesurer une température influant sur ladite distance, et des moyens pour corriger le réglage de cette distance en fonction de la température mesurée.
- Machine suivant la revendication 9, caractérisée en ce que le capteur de température (22) est couplé thermiquement à une pièce mécanique (4) voisine du train de meules (5) et dont l'inertie thermique est voisine de celle de ce train de meules.
- Machine suivant la revendication 10, caractérisée en ce que ladite pièce mécanique (4) est un châssis porte-meules.
- Machine suivant l'une quelconque des revendications 9 à 11, caractérisée en ce qu'elle comporte un circuit fermé (9 à 13) de liquide lubrifiant de meulage.
- Machine suivant l'une quelconque des revendications 9 à 12, caractérisée en ce qu'elle comprend un ordinateur de commande (8) ayant en mémoire une courbe de variation, en fonction de la température mesurée, du rayon (R) de l'ébauche meulée, pour au moins une position angulaire de celle-ci, et/ou du rayon (R1) des meules, et/ou du rayon (R2) de l'ébauche de départ.
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 |
FR9902919A FR2784922B1 (fr) | 1998-10-23 | 1999-03-09 | Procede et machine de meulage de verres optiques |
FR9902919 | 1999-03-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0995548A1 EP0995548A1 (fr) | 2000-04-26 |
EP0995548B1 true EP0995548B1 (fr) | 2002-08-14 |
Family
ID=26234615
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99402580A Expired - Lifetime EP0995548B1 (fr) | 1998-10-23 | 1999-10-19 | Procédé et machine de meulage de verres optiques |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0995548B1 (fr) |
DE (1) | DE69902507T2 (fr) |
ES (1) | ES2182467T3 (fr) |
FR (1) | FR2784922B1 (fr) |
IL (1) | IL132492A (fr) |
Citations (1)
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)
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 |
-
1999
- 1999-03-09 FR FR9902919A patent/FR2784922B1/fr not_active Expired - Fee Related
- 1999-10-19 DE DE69902507T patent/DE69902507T2/de not_active Expired - Lifetime
- 1999-10-19 ES ES99402580T patent/ES2182467T3/es not_active Expired - Lifetime
- 1999-10-19 EP EP99402580A patent/EP0995548B1/fr not_active Expired - Lifetime
- 1999-10-21 IL IL13249299A patent/IL132492A/xx not_active IP Right Cessation
Patent Citations (1)
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 |
---|---|
IL132492A (en) | 2003-06-24 |
EP0995548A1 (fr) | 2000-04-26 |
ES2182467T3 (es) | 2003-03-01 |
DE69902507D1 (de) | 2002-09-19 |
FR2784922A1 (fr) | 2000-04-28 |
IL132492A0 (en) | 2001-03-19 |
FR2784922B1 (fr) | 2001-02-09 |
DE69902507T2 (de) | 2003-05-28 |
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