EP1393855A1 - Procédé pour fabriquer des lentilles - Google Patents

Procédé pour fabriquer des lentilles Download PDF

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Publication number
EP1393855A1
EP1393855A1 EP03102667A EP03102667A EP1393855A1 EP 1393855 A1 EP1393855 A1 EP 1393855A1 EP 03102667 A EP03102667 A EP 03102667A EP 03102667 A EP03102667 A EP 03102667A EP 1393855 A1 EP1393855 A1 EP 1393855A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
rpm
producing
optically active
active surface
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.)
Granted
Application number
EP03102667A
Other languages
German (de)
English (en)
Other versions
EP1393855B1 (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
Original Assignee
Schneider GmbH and Co KG
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 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 with at least one first processing stage, in which at least one first processing step is carried out with a cutting tool, the cutting tool generating adjacent grooves on the workpiece due to the feed rate.
  • a manufacturing method for ophthalmic lens surfaces is already known from WO 01/66308 A1.
  • An essentially two-stage process is described here.
  • the workpiece is processed with a cutting tool on a continuous path, the grooves generated by the cutting tool lying next to one another and having a constant step size between 0.1 mm and 3 mm, in particular between 0.03 mm and 0.05 mm ,
  • a second and a third method step are also described, wherein in the first method step a step size of the tool of 3 mm is used, in the next step a step size of 2 mm and finally in the third step a step size of 1 mm is used.
  • the workpiece is machined using a Smoothing tool moved on a continuous path, two paths lying next to each other constant step size between 0.2 mm and 3 mm, in particular between 0.04 mm and 1.25 mm or exactly Have 0.625 mm.
  • EP 0 849 038 A2 describes a high-speed lathe for turning optically active surfaces described.
  • the tool slide is radial and axially movable to the axis of rotation of the workpiece. According to claim 2, the speed increases at radial Delivery of the tool to ensure a constant cutting speed. Ranges of values the speed and the groove spacing are not described.
  • US 6,074,281 describes a polishing process in which the workpiece and the tool on the one hand a lifting movement run relative to each other in the direction of a first axis and on the other hand around a second non-parallel axis rotationally an alternating movement for polishing To run. An indication of the distance between them generated polishing tracks are not given.
  • the invention has for its object to provide a method for producing an optically active surface such that an optimal surface quality is guaranteed.
  • the object is achieved according to the invention in that in the first machining step the speed of the workpiece is increased or remains constant from a start value ⁇ s at the beginning of the machining to a final value ⁇ e towards the end of the machining of the workpiece, the rotational speed ⁇ being between 750 rpm / min and 6000 rpm, 750 rpm and 1500 rpm, 750 rpm and 3000 rpm or between 1500 rpm and 3000 rpm, and the distance d from two adjacent grooves or whose average distance d, ie the distance d from center to center, is changed or kept constant from a start value d s at the beginning of the machining to an end value d e towards the end of the machining of the workpiece, the distance d having a value between 0.05 mm and 0.2 mm, 0.05 mm and 0.1 mm or 0.15 mm and 0.2 mm.
  • the distance d to a value between 0.003 mm and 0.01 mm, in particular between 0.008 mm and 0.055 mm, is set or reduced. Starting from becomes a constant value in the first processing step the distance d is reduced. Thus, a very high one Surface quality achieved, which requires little polishing guaranteed.
  • Feed speed S [mm / s] during one Processing step is kept constant.
  • the absolute Feed speed S is constant and the specific one Feed is disproportionate to the angular velocity, d. H. the specific feed decreases with increasing Angular velocity.
  • an additional possibility is that the speed of the workpiece is increased or kept constant during the machining from ⁇ s to ⁇ e and the distance d of the grooves is expanded, reduced or kept constant from d s to d e .
  • the change in the rotational speed ⁇ and the distance d take place continuously, a different form of the change, for example in stages, also being possible.
  • the proportion of the cutting speed that decreases with the radius is compensated for by increasing the speed.
  • the distance d between the grooves increases or decreases.
  • the change in the speed ensures a simple drive control regarding the angular speed of the workpiece and the translatory movement of the tool running in the radial direction of the workpiece.
  • the cutting speed S C is kept approximately constant during a machining step, S C having 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, R T being 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 should be infinitely large towards the central axis of the workpiece so that the cutting speed would be kept constant. Accordingly, the cutting speed in the area of the workpiece center decreases steadily within the last millimeters.
  • the workpiece is machined with a polishing tool in a second machining step, the distance d P of two successively generated polishing tracks being at most between 1 mm and 20 mm, in particular between 5 mm and 15 mm.
  • the polishing tool has a diameter of approximately 30 mm, so that the polishing tracks are covered with consideration of the curvature of the workpiece surface and at a distance d P between 1 mm and 20 mm.
  • At least one continuous polishing path is generated on the workpiece, the polishing path intersecting at at least one point K 1 on the workpiece and several continuous polishing paths are generated on the workpiece, the polishing paths cut at least one point S 1 on the workpiece.
  • the cutting tool during processing translationally in the direction of its axis of rotation proceed and the direction of translational movement of the cutting tool per revolution of the workpiece is changed at least once, the frequency of the translatory movement between 12.5 Hz and 100 Hz, in particular between 30 Hz and 70 Hz. So are in addition to the production of spherical surfaces Production of aspherical surfaces and the production of Guaranteed open spaces.
  • the translational Movement is carried out as a lifting or lowering movement.
  • the radial basic feed is horizontal Direction, this movement being the translatory stroke or lowering movement is superimposed.
  • the polishing path 21 shown in FIG. 1 is created by placing the polishing tool on the outer edge of the rotating, elliptical workpiece 23. After placing the tool, it is moved radially to the center 24 of the workpiece 23 and beyond the center 24. The superimposition of the translational 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 shown in FIG. 1.
  • the polishing track 21 has the crossing points 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 track 22, are generated.
  • the second polishing track 22 is provided which, in addition to the intersection points with itself, has a plurality of intersection points S 1 , S 2 , S 3 and S 4 with the first polishing track 21.
  • All movements of the machine are done by one High-performance electronics controlled and regulated.
  • the three Machine axes (C, X and Z axes) are with each other connected.
  • the machine body consists of a lower one Machine bed 1, on the right and left two Build up vertical side parts 2.
  • the workpiece spindle 3 is mounted on its upper End has a receptacle 4 for the workpiece 5.
  • the Workpiece spindle 3 is driven by an electric motor 6 driven and can either run continuously or it can be switched to a controlled one by switching axes Rotary axis (C axis) can be transformed.
  • the two side parts 2 carry two at their upper end horizontal, one behind the other guide tubes 7 where the recirculating ball guides 8 run. Make this possible the radial tool movement (X axis) and carry the Traverse 9.
  • the traverse 9 is also with a coupling rod 13 connected, which is the connection to a conventional Feed drive 14 produces.
  • this conventional Feed drive 14 is the radial tool infeed (in horizontal direction) driven (X-axis).
  • each two recirculating ball guides 15 which in turn the wear movable secondary part 16 of the linear motor and thus enabling axial movement (Z axis).
  • the Tool carriage 17 attached to the shown Example carries three tools.
  • the right tool 18 is used to edit the contour of the workpiece 5 while the Left tool 19 for working chamfers on the workpiece 5 serves.
  • the middle tool 20 is the polishing tool.
  • the workpiece 5 is fast in the workpiece spindle 3 Rotation offset.
  • the Tool slide 17 by means of secondary part 16 of the Linear motor in the Z-axis vertically downwards driven and by means of conventional feed drive 14 in move the X-axis horizontally until the tip of the tool 18 the outer edge of the workpiece 5 straight touched.
  • the feed drive 14 for a smooth feed movement of the tool slide 17 and tool 18 in horizontal, i.e. H. radial direction ensures (X axis)
  • the tool slide 17 with the Tool 18 from the secondary part 16 of the linear motor in vertical, d. H. axial direction (Z axis) oscillating moved so that the desired contour on the workpiece 5 arises.
  • This step can - if necessary - then with high cutting speed at very small infeed movements in the X axis are repeated, to achieve the desired surface quality.
  • the lens with tool 19 on the circumference machined and polished with tool 20 All movements in the three axes are linked, i. H. she 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)
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 true EP1393855A1 (fr) 2004-03-03
EP1393855B1 EP1393855B1 (fr) 2007-02-07

Family

ID=31197595

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)

Country Link
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0849038A2 (fr) * 1996-12-20 1998-06-24 Schneider GmbH + Co. KG Tour à grande vitesse pour la fabrication de surfaces optiques actives
US6074281A (en) * 1998-11-30 2000-06-13 Dac Vision, Inc. Fining and polishing machine and method for ophthalmic lenses
WO2001066308A1 (fr) * 2000-03-06 2001-09-13 Essilor International (Compagnie Generale D'optique) Procede de fabrication d'une surface d'une lentille ophtalmique, installation de mise en oeuvre du procede et lentille ophtalmique obtenue selon le procede

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0849038A2 (fr) * 1996-12-20 1998-06-24 Schneider GmbH + Co. KG Tour à grande vitesse pour la fabrication de surfaces optiques actives
US6074281A (en) * 1998-11-30 2000-06-13 Dac Vision, Inc. Fining and polishing machine and method for ophthalmic lenses
WO2001066308A1 (fr) * 2000-03-06 2001-09-13 Essilor International (Compagnie Generale D'optique) Procede de fabrication d'une surface d'une lentille ophtalmique, installation de mise en oeuvre du procede et lentille ophtalmique obtenue selon le procede

Also Published As

Publication number Publication date
ES2279931T3 (es) 2007-09-01
EP1393855B1 (fr) 2007-02-07
DE10240783A1 (de) 2004-03-18
ATE353268T1 (de) 2007-02-15
DE10240783B4 (de) 2005-01-13
DE50306452D1 (de) 2007-03-22

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