EP1393855B1 - Procédé pour fabriquer des lentilles - Google Patents

Procédé pour fabriquer des lentilles Download PDF

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Publication number
EP1393855B1
EP1393855B1 EP03102667A EP03102667A EP1393855B1 EP 1393855 B1 EP1393855 B1 EP 1393855B1 EP 03102667 A EP03102667 A EP 03102667A EP 03102667 A EP03102667 A EP 03102667A EP 1393855 B1 EP1393855 B1 EP 1393855B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
rpm
value
processing
procedure
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
EP03102667A
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German (de)
English (en)
Other versions
EP1393855A1 (fr
Inventor
Gunter Schneider
Klaus Krämer
Helwig Buchenauer
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.)
Schneider GmbH and Co KG
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Schneider GmbH and Co KG
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Publication date
Application filed by Schneider GmbH and Co KG filed Critical Schneider GmbH and Co KG
Publication of EP1393855A1 publication Critical patent/EP1393855A1/fr
Application granted granted Critical
Publication of EP1393855B1 publication Critical patent/EP1393855B1/fr
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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices

Definitions

  • the invention relates to a method for producing an optically active surface having at least one first processing stage, wherein at least one first processing step is carried out with a cutting tool, wherein the cutting tool incorporates adjacent grooves in the workpiece due to the feed speed.
  • Such a method is known from WO 01/66308 A1.
  • a substantially two-step process will be described.
  • the workpiece is machined with a cutting tool on a continuous web, the grooves generated by the cutting tool being juxtaposed and having a constant pitch of between 0.1 mm and 3 mm, in particular between 0.03 mm and 0.05 mm .
  • It also describes a second and a third method step, wherein in the first method step, first, a step size of the tool of 3 mm, in the subsequent process step, a step size of 2 mm and finally in the third step, a step size of 1 mm is used.
  • the workpiece is moved by means of a smoothing tool on a continuous path, with two adjacent paths a constant pitch between 0.2 mm and 3 mm, in particular between 0.04 mm and 1.25 mm or exactly 0.625 mm.
  • EP 0 849 038 A2 describes a high speed lathe for rotating optically active surfaces.
  • the tool carriage is movable in the radial and axial direction to the axis of rotation of the workpiece.
  • the speed increases with radial delivery of the tool to ensure a constant cutting speed. Value ranges concerning the rotational speed and the groove spacing are not described.
  • US Pat. No. 6,074,281 describes a polishing method in which the workpiece and the tool, on the one hand, perform a lifting movement in the direction of a first axis relative to one another and, on the other hand, execute a reciprocating movement for polishing about a second non-parallel axis rotationally relative to one another. An indication of the distance between the generated polishing tracks is not given.
  • the invention has the object of providing a method for producing an optically active surface by rotating machining in such a way that an optimum surface quality is ensured.
  • the distance d is set or reduced to a value between 0.003 mm and 0.01 mm, in particular between 0.008 mm and 0.055 mm. Starting from the value in the first processing step, the distance d is reduced. Thus, a very high surface quality is achieved, which ensures a low polishing effort.
  • the feed rate S [mm / s] is kept constant during a processing step.
  • the absolute feedrate S is constant and the specific feedrate is counterproportional to the angular velocity, ie the specific feed rate (per revolution) decreases with increasing angular velocity.
  • the cutting speed S c is kept approximately constant during a processing step, wherein S c has a value between 1 m / s and 24 m / s, in particular between 8 m / s and 14 m / s and the cutting speed S c is kept constant over a partial radius R T of the workpiece, where R T is between 0% and 87.5%, in particular between 0% and 85%, or between 12.5% and 100%, in particular between 15% and 100 % of the total radius, measured from the center of the workpiece.
  • R T is between 0% and 87.5%, in particular between 0% and 85%, or between 12.5% and 100%, in particular between 15% and 100 % of the total radius, measured from the center of the workpiece.
  • the angular velocity would have to be infinitely large, so that the cutting speed would be kept constant. Accordingly, the cutting speed in the area of the workpiece center point decreases continuously within the last millimeter.
  • the workpiece is machined with a polishing tool, wherein the distance d P of two successively generated polishing tracks is at most between 1 mm and 20 mm, in particular between 5 mm and 15 mm.
  • the polishing tool has a diameter of about 30 mm, so that with respect to the curvature of the workpiece surface and at a distance dp between 1 mm and 20 mm, an overlap of the polishing paths is ensured.
  • At least one continuous polishing path is generated on the workpiece, wherein the polishing path crosses at least one point K 1 on the workpiece and a plurality of continuous polishing paths are generated on the workpiece, the polishing paths themselves cut at least one point S 1 on the workpiece.
  • the cutting tool during machining in the direction of its axis of rotation translationally and the direction of the translational movement of the cutting tool per revolution of the workpiece is changed at least once, the frequency of the translational movement between 12.5 Hz and 100 Hz, in particular between 30 Hz and 70 Hz.
  • the translational movement is carried out as a lifting or lowering movement.
  • the basic radial feed takes place here in the horizontal direction, this movement being superimposed on the translatory lifting or lowering movement.
  • the polishing sheet 21 shown in Figure 1 is formed by placing the polishing tool on the outer edge of the rotating, elliptical workpiece 23. After placement of the tool, this is moved radially to the center 24 of the workpiece 23 and beyond the center 24 addition.
  • the superimposition of the translatory movement of the polishing head in the radial direction of the workpiece 23 and the rotation of the workpiece 23 results in the polishing tracks 21, 22 illustrated in FIG. 1.
  • the polishing track 21 has the points of intersection K 1 and K 2 with itself. Depending on the angular velocity of the workpiece 23 and the translational movement of the polishing head different, similar polishing tracks, such as the polishing pad 22 are generated.
  • the second polishing track 22 is provided which, in addition to the points of intersection with itself, has a plurality of points of intersection S 1 , S 2 , S 3 and S 4 with the first polishing track 21.
  • the machine body consists of a lower machine bed 1, on which right and left two vertical side parts 2 build.
  • the workpiece spindle 3 is mounted, which has a receptacle 4 for the workpiece 5 at its upper end.
  • the workpiece spindle 3 is driven by an electric motor 6 and can either rotate continuously or it can be converted by Achsumscnies in a controlled rotary axis (C-axis).
  • the two side parts 2 carry at its upper end two horizontal guide tubes 7 lying one behind the other, on which the recirculating ball guides 8 run. These allow the radial tool movement (X-axis) and carry the cross member 9.
  • On the cross member 9 is a right and left each guide tube 10 is attached and also it carries the Adapter 11 for receiving the primary part 12 of the linear motor with the stator windings.
  • the traverse 9 is also connected to a coupling rod 13, which establishes the connection to a conventional feed drive 14. With this conventional feed drive 14, the radial tool feed (in the horizontal direction) is driven (X-axis).
  • the workpiece 5 is set in rapid rotation by means of the workpiece spindle 3. Subsequently, the tool carriage 17 is driven by secondary part 16 of the linear motor in the Z-axis as far down vertically and moved horizontally by conventional feed drive 14 in the X-axis so far that the tip of the tool 18 touches the outer edge of the workpiece 5 straight. While then the feed drive 14 for a uniform feed movement of the tool carriage 17 and tool 18 in a horizontal, ie radial direction provides (X-axis), the tool carriage 17 with the tool 18 of the secondary part 16 of the linear motor in vertical, ie axial direction (Z-axis), oscillating so moved that the desired contour on the workpiece 5 is formed.
  • this operation can then be repeated at high cutting speeds for very small infeed movements in the X-axis in order to achieve the desired surface quality.
  • the lens is machined with tool 19 on the circumference and polished with tool 20. All movements in the three axes are linked, ie they depend on each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)
  • Glass Compositions (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (9)

  1. Procédé pour la fabrication d'une surface optiquement active d'une pièce à usiner avec au moins une phase d'usinage, pour laquelle au moins une étape d'usinage est effectuée avec un outil de coupe, ledit outil de coupe creusant dans la pièce à usiner en raison de la vitesse d'avance des rainures voisines les unes des autres suivant la direction du périmètre, caractérisé par les étapes de procédé suivantes :
    a) au cours de la première étape d'usinage, la vitesse de rotation de la pièce à usiner est augmentée à partir d'une valeur initiale ωs au début de l'usinage jusqu'à une valeur finale ωe vers la fin de l'usinage, ωs ayant une valeur entre 750 t/min et 6000 t/min ou entre 750 t/min et 3000 t/min et ωe ayant une valeur entre 750 t/min et 6000 t/min, entre 750 t/min et 3000 t/min ou entre 1500 t/min et 6000 t/min,
    b) l'écart d entre deux rainures voisines l'une de l'autre est modifié d'une valeur initiale ds au commencement de l'usinage à une valeur finale de vers la fin de l'usinage de la pièce à usiner, ds ayant une valeur entre 0,05 mm et 0,2 mm, 0,05 mm et 0,1 mm ou 0,15 mm et 0,2 mm et de ayant une valeur entre 0,05 mm et 0,2 mm, 0,05 mm et 0,1 mm ou 0,15 mm et 0,2 mm.
  2. Procédé pour la fabrication d'une surface optiquement active selon la revendication 1, caractérisé en ce que, au cours d'une deuxième étape d'usinage, l'écart d entre deux rainures voisines l'une de l'autre est réglé sur une valeur entre 0,003 mm et 0,01 mm ou entre 0,008 mm et 0,055 mm.
  3. Procédé pour la fabrication d'une surface optiquement active selon les revendications 1 ou 2, caractérisé en ce que la vitesse d'avance S est maintenue constante en direction radiale de la pièce à usiner.
  4. Procédé pour la fabrication d'une surface optiquement active selon les revendications 1, 2 ou 3, caractérisé en ce que la modification de l'écart d des rainures est constante.
  5. Procédé pour la fabrication d'une surface optiquement active selon les revendications 1, 2, 3 ou 4, caractérisé en ce que :
    a) la vitesse de coupe SC est maintenue approximativement constante pendant une étape d'usinage, SC présentant une valeur entre 1 m/s et 24 m/s, en particulier entre 5 m/s et 12 m/s,
    b) la vitesse de coupe SC est maintenue constante de l'extérieur vers l'intérieur sur un rayon partiel RT de la pièce à usiner, RT représentant entre 0 % et 87,5 % ou entre 0 % et 85 % du rayon total.
  6. Procédé pour la fabrication d'une surface optiquement active selon les revendications 1 à 5, caractérisé en ce que la pièce à usiner (23) est usinée avec un outil de polissage au cours d'une deuxième étape d'usinage, l'écart dP entre deux parcours de polissage (21, 22) voisins générés l'un après l'autre possédant en direction radiale une valeur entre 1 mm et 20 mm ou entre 5 mm et 15 mm, au maximum.
  7. Procédé pour la fabrication d'une surface optiquement active selon les revendications 1 à 6, caractérisé en ce que :
    a) au moins un parcours de polissage (21) continu est généré sur la pièce à usiner (23), le parcours de polissage (21) se croisant lui-même en au moins un emplacement K1 sur la pièce à usiner,
    b) plusieurs parcours de polissage (21, 22) continus sont générés sur la pièce à usiner (23), les parcours de polissage (21, 22) se recoupant en au moins un emplacement S1 sur la pièce à usiner (23).
  8. Procédé pour la fabrication d'une surface optiquement active selon les revendications 1, 2 ou 3, caractérisé en ce que :
    a) l'outil de coupe est déplacé de façon translatoire dans la direction de son axe de rotation pendant l'usinage,
    b) la direction du mouvement de translation de l'outil de coupe est modifiée au moins une fois par rotation de la pièce à usiner,
    c) la fréquence du mouvement de translation se situe entre 12,5 Hz et 100 Hz ou entre 30 Hz et 70 Hz.
  9. Procédé pour la fabrication d'une surface optiquement active selon la revendication 8, caractérisé en ce que le mouvement de translation est exécuté comme mouvement de levage ou encore comme mouvement d'abaissement.
EP03102667A 2002-08-30 2003-08-28 Procédé pour fabriquer des lentilles Expired - Lifetime EP1393855B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10240783 2002-08-30
DE2002140783 DE10240783B4 (de) 2002-08-30 2002-08-30 Verfahren zum Herstellen von optischen Linsen

Publications (2)

Publication Number Publication Date
EP1393855A1 EP1393855A1 (fr) 2004-03-03
EP1393855B1 true EP1393855B1 (fr) 2007-02-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03102667A Expired - Lifetime EP1393855B1 (fr) 2002-08-30 2003-08-28 Procédé pour fabriquer des lentilles

Country Status (4)

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EP (1) EP1393855B1 (fr)
AT (1) ATE353268T1 (fr)
DE (2) DE10240783B4 (fr)
ES (1) ES2279931T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021133373A1 (de) 2021-12-15 2023-06-15 tooz technologies GmbH BEARBEITEN VON AUßERAXIAL ANGEORDNETEN OPTISCHEN WERKSTÜCKEN

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19653233A1 (de) * 1996-12-20 1998-07-02 Schneider Gmbh & Co Kg Hochgeschwindigkeits-Drehmaschine zum Herstellen optisch wirksamer Oberflächen
US6074281A (en) * 1998-11-30 2000-06-13 Dac Vision, Inc. Fining and polishing machine and method for ophthalmic lenses
US6558586B1 (en) * 2000-03-06 2003-05-06 Essilor International (Compagnie Generale D'optique) Process for fabricating a surface of an ophthalmic lens, installation for implementing the process and ophthalmic lens obtained by the process

Also Published As

Publication number Publication date
EP1393855A1 (fr) 2004-03-03
ES2279931T3 (es) 2007-09-01
DE10240783A1 (de) 2004-03-18
ATE353268T1 (de) 2007-02-15
DE10240783B4 (de) 2005-01-13
DE50306452D1 (de) 2007-03-22

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