EP2018247B1 - Verfahren und vorrichtung zum abgraten einer linse durch schneiden der linse - Google Patents

Verfahren und vorrichtung zum abgraten einer linse durch schneiden der linse Download PDF

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Publication number
EP2018247B1
EP2018247B1 EP20070731355 EP07731355A EP2018247B1 EP 2018247 B1 EP2018247 B1 EP 2018247B1 EP 20070731355 EP20070731355 EP 20070731355 EP 07731355 A EP07731355 A EP 07731355A EP 2018247 B1 EP2018247 B1 EP 2018247B1
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EP
European Patent Office
Prior art keywords
lens
cutting
tool
machining
parameter relating
Prior art date
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Active
Application number
EP20070731355
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English (en)
French (fr)
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EP2018247A1 (de
Inventor
Cédric LEMAIRE
Michel Nauche
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EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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Priority claimed from FR0604133A external-priority patent/FR2900853B1/fr
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Publication of EP2018247A1 publication Critical patent/EP2018247A1/de
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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
    • B24B9/148—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 electrically, e.g. numerically, controlled
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49995—Shaping one-piece blank by removing material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49995—Shaping one-piece blank by removing material
    • Y10T29/49996—Successive distinct removal operations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30084—Milling with regulation of operation by templet, card, or other replaceable information supply
    • Y10T409/30112—Process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/306664—Milling including means to infeed rotary cutter toward work
    • Y10T409/30756—Machining arcuate surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/02—Other than completely through work thickness
    • Y10T83/0333—Scoring
    • Y10T83/0348—Active means to control depth of score

Definitions

  • the present invention relates generally to the mounting of ophthalmic lenses of a pair of corrective eyeglasses on a frame and more particularly to a method and a device for trimming an ophthalmic lens of a pair of spectacles for mounting on a frame.
  • the technical part of the optician's profession is to mount a pair of ophthalmic lenses in or on the frame selected by the wearer.
  • the trimming of a lens for mounting in or on the frame chosen by the future carrier is to change the contour of the lens to adapt to the frame and / or the desired lens shape.
  • the trimming conventionally breaks down into two main operations, with an edging operation (often called "roughing") and a finishing operation adapted to the type of assembly.
  • the edging consists in eliminating the superfluous peripheral part of the ophthalmic lens concerned, in order to reduce the contour, which is most often initially circular, to that whichever of the circle or surround of the spectacle frame concerned or simply to the desired aesthetic shape when the mount is of the type without circles.
  • This edging operation is usually followed by a chamfering operation which consists of cutting or chamfering the two sharp edges of the edge of the overflow lens.
  • the finishing operation depends on the assembly to be performed.
  • this chamfering is accompanied by a beveling consisting in ensuring the formation of a rib usually called bevel.
  • This bevel is intended to be engaged in a corresponding groove, commonly called bezel, formed in the circle or surround of the eyeglass frame in which the lens is to be mounted.
  • the trimming of the lens and, possibly, the reduction of the sharp edges (chamfering) are followed by the appropriate drilling of the lenses to allow the fixation of the branches and the nasal bridge of the mount without circle.
  • the chamfering is accompanied by a grooving consisting of a groove in the edge of the lens, this groove being intended to receive the nylon wire of the frame for pressing the lens against the rigid part of the frame.
  • the edging and finishing operations can themselves be divided into several sub-operations, for example: roughing, finishing, polishing.
  • documents are known EP 1 616 663 , DE 197 38 668 and DE 38 04 133 ophthalmic lens trimming processes comprising a first lens-edging operation using a first machining tool, and a second finishing operation of the lens using a second machining tool to form a bevel or groove on the edge of the lens or to pierce the lens.
  • the first machining tool is a lens cutting tool such as a cutter, a water jet or a laser. This first machining tool is systematically selected to rough out the clipping of the lens.
  • the trimming of the lens is performed on a numerically controlled grinder which has means for holding and rotating the lens and several wheels suitable for the various operations to be performed.
  • the lens is first locked on the holding and driving means in a known configuration so that its optical reference is known and operations can be performed accurately with reference to this reference. It is understood that this blocking, accompanied by the storage of the optical reference system, makes it possible to define and physically materialize on the lens a geometric reference system in which the points and directions characteristic of the lens, necessary for the coherence of this with the position of the pupil, as well as the clipping values so that these points and characteristic directions are properly positioned in the frame.
  • the centering of the lens in particular the axis (that is to say, the angular orientation of the lens in the reference frame of the grinder) is then modified and the resulting contour of the lens is different, compared to its optical reference, the desired final contour after clipping.
  • certain organic materials used in the composition lenses give off malodorous substances when machined. It is in particular medium organic materials and high indices, typically index greater than 1.6. However, it is easy to understand that the release of such odors is detrimental not only to the working conditions of the operators working on or in the vicinity of the clipping machines, but also to the satisfaction of the customers when the lens preparation workshop. adjoins the sales area or is simply visited.
  • An object of the present invention is to provide a method and a trimming device for efficient, accurate and reliable trimming of lenses having various properties exposing them or not to a risk of slippage or deformation during their machining.
  • Another object of the present invention is to provide a method and a trimming device capable of reducing the release of smelly or harmful substances when trimming certain lenses.
  • Yet another object of the present invention is to provide a method and a trimming device capable of contouring lenses into complex shapes.
  • the invention also relates to a device for trimming an optical lens according to claim 15.
  • the cutting tool is selected and then makes it possible to restore the desired radius at each point of the contour of the lens by machining a small amount of material.
  • the amount of material machined by cutting corresponds to the length of the path followed by the cutting tool (mainly the desired contour of the lens) over a width corresponding to the diameter of the cutting tool. Unlike machining the edge of the lens, it is not necessary to machine all the material between the periphery, or gross outline, of the lens and the desired contour of the lens.
  • the volume of material machined by cutting in full material by means of a milling cutter with a diameter of 1.5 mm is approximately 10 times smaller than the volume of material machined by grinding by means of a grinding wheel. 155 mm in diameter.
  • the first machining tool can be selected so as to obtain more quickly the desired contour and to avoid too fast wear of the cutting tool.
  • the selection of the working tool makes it possible to choose either the cutting tool (with which the risk of sliding of the given tightening lens and / or release of troublesome substances is limited during the trimming), or the first machining tool if the lens is neither slippery nor fragile and does not contain smelly substances.
  • the clipping of the lenses is then efficient, precise and reliable and it does not inconvenience the operator or his neighborhood.
  • the selection between the machining of the edge of the lens and the cutting in full material of the lens is performed according to criteria relating to one and / or the other of the risks incurred by the specific flushing operation to be performed. : sliding of the lens, cracking of the lens, release of uncomfortable substances.
  • the parameter or parameters taken into account in particular make it possible to determine whether the lens is slippery or non-slippery, whether it is fragile or whether its material is such as to release smelly substances.
  • the given clipping operation for which said selection is made, is a blank followed by a finishing performed on a second machining tool of the edge of the lens distinct from the first tool of the invention. machining the edge of the lens.
  • the cut-out roughing blank (often referred to as an edging) makes it possible to limit the slippage of the lens without increasing significant cycle times of the lens. And carrying out the finish of the trimming of the lens with a grinding wheel makes it possible to precisely machine the periphery of the lens that has been roughed out to obtain a desired contour of precise dimension.
  • the amount of material to be machined remaining between the blank outline and the desired contour is small and thus limits the friction and torque exerted by the finishing wheel on the lens.
  • the radius of the lens is substantially reduced after roughing, which mechanically reduces the torque transmitted by the wheel to the lens.
  • the diameter of the cutting tool in full material of the lens is substantially lower to the diameter of the first machining tool of the edge of the lens.
  • the torque exerted by the cutting tool on the lens is much smaller than the torque exerted by the grinding wheel on the lens, for the same amount of material. remove, which limits the sliding of the lens.
  • the diameter of the cutting tool in full material of the lens is substantially less than the radius of the lens.
  • the small diameter of the cutting tool makes it possible to cut the material in full material of the lens.
  • the smaller the diameter of the cutting tool the lower the frictional forces and the torque exerted on the lens. The sliding of the lens is then reduced and the trimming is more precise.
  • the cutting of the lens comprises several cutting passes each made according to the desired contour with a reduced axial depth of pass, that is to say less than the thickness of the lens.
  • At least one face of the lens is palpated along the desired contour and, during at least one cutting pass, the cutting tool is driven axially according to the sensing data thus collected.
  • the steps of the axial depths of cutting passes are adjustable.
  • the adjustment of the axial depth pitch between two passes makes it possible to vary the quantity of material to be removed with each pass and thus to adapt the torque exerted by the cutting tool on the lens to limit the sliding of the lens.
  • the lens being rotated with respect to the cutting tool about an axis substantially parallel to the axis of the lens, the direction of rotation is reversed between two cutting passes.
  • the lens being rotated with respect to the cutting tool about an axis substantially parallel to the axis of the lens, at least part of a cutting pass is performed with a first direction of rotation and the complementary portion of said pass is made with a second direction of rotation opposite the first direction of rotation.
  • the cutting of the lens comprises, in addition to the cutting of the lens along the desired contour, the cutting along the radial sectoring lines separating a plurality of peripheral sectors.
  • the cutting of the lens by making several parts of the drop makes it possible to limit the stresses exerted on the lens by the part of the lens situated between the periphery of the lens and the desired contour which has just been cut off and which remains attached to the lens. .
  • the cutting of the radial lines precedes the cutting according to the desired contour.
  • at least one face of the lens is palpated along the radial sectoring lines.
  • the cutting tool is driven axially according to the collected probing data
  • said selection consists in using the cutting tool when at least one face of the optical lens is coated with a treatment which gives the surface of said face of the optical lens an angle wettability greater than 100 degrees.
  • the lens is said to have low surface energy.
  • the cutting tool is thus selected for lenses that tend to slide significantly. With this cutting tool, the slippage of the lens is limited during the trimming which allows to obtain the desired contour of the lens reliably, efficiently and accurately.
  • the selection means comprise determination means designed to determine which of the first machining tool of the edge of the lens or of the cutting tool of the lens is to be selected.
  • the determination of the working tool to be used for the roughing of the lens makes it possible to partly automate the selection.
  • the lens being held by holding means
  • the determining means comprise means for calculating the value of a parameter relating to the lens and / or relative to the machining tools or for cutting and / or relative to the holding means, and the determining means are designed to determine which of the first machining tool of the edge of the lens or of the cutting tool of the lens is to be selected according to the value said parameter.
  • the calculation means make it possible to determine the working tool to be used according to predetermined criteria, which also contributes to the automation of the selection of the work tool.
  • said parameter is the maximum value of the torque that can be applied to the lens without it sliding relative to the holding means.
  • the cutting tool of the lens is mounted movably relative to the lens in a direction parallel to the axis of this lens.
  • the invention also relates to a method of trimming an optical lens coated with a low surface energy treatment, comprising the cutout in full material of the lens.
  • FIG. 1 To the figure 1 there is shown a clipping device 6 equipped with a cutting module 636 of an optical lens 100.
  • the trimming device 6 is adapted to modify the contour of the ophthalmic lens to adapt to that of the frame or "circle" of a selected frame.
  • the trimming device comprises a flip-flop 611, which is freely pivotally mounted about a first axis A1, in practice a horizontal axis, on a frame.
  • the shaping device is equipped with support means able to clamp and rotate an ophthalmic lens.
  • These support means, or retaining means comprise two shafts and rotational drive shafts 612, 613. These two shafts 612, 613 are aligned with each other along a second axis A2, called the locking pin, parallel to the first axis A1.
  • the two shafts 612, 613 are rotated synchronously by a motor (not shown), via a common drive mechanism (not shown) embedded on the flip-flop 611.
  • This common synchronous rotation drive mechanism is of type current, known in itself.
  • the ROT rotation of the shafts 612, 613 can be controlled by the central electronic and computer system such as an integrated microcomputer or a set of dedicated integrated circuits.
  • Each of the shafts 612, 613 has a free end which faces the other and is equipped with a locking nose (not shown). These locking noses are not always fixed on the shafts 612, 613. They are in fact previously used by gripping means (not shown) to lock the lens before being transferred to the present clipping device 6 while remaining in position. contact with the transferred lens.
  • the shaft 613 is movable in translation along the blocking axis A2, facing the other shaft 612, to effect the compression in axial compression of the lens between the two locking noses.
  • the shaft 613 is controlled for this axial translation by a drive motor via an actuating mechanism (not shown) controlled by the central electronic and computer system.
  • the other shaft 612 is fixed in translation along the blocking axis A2.
  • the trimming device comprises a machining tool train 614 which firstly comprises a first machining tool 50 intended to produce a blank of the trimming of the edge of the lens 100.
  • This first machining tool 50 is here a wheel, but alternatively, it can be expected to use a roughing cutter.
  • the grain size of the roughing wheel is of the order of 150 to 500 microns.
  • the machining tool train 614 comprises a second machining tool 55 of the edge of the lens 100 distinct from the first machining tool 50 of the edge of the lens 100 intended to perform a finishing of the trimming of the
  • This second machining tool 55 of the edge of the lens 100 is here a finishing wheel which comprises a beveling groove and grains whose size is of the order of 55 microns.
  • the roughing and finishing wheels are cylindrical and have a diameter of the order of 155 mm.
  • the machining tool train 614 is attached to a common shaft of axis A3 ensuring their rotational drive during the edging operation.
  • This common shaft which is not visible in the figures shown, is rotated by an electric motor 620 driven by the electronic and computer system.
  • the machining tool train 614 is also movable in translation along the axis A3 and is controlled in this translation by a drive motor.
  • a drive motor Concretely, the entire machining tool train 614, its shaft and its motor is carried by a carriage 621 which is itself mounted on slides 622 secured to the frame for sliding along the third axis A3.
  • the translational movement of the wheel trolley 621 is called transfer and is noted TRA on the figure 1 .
  • This transfer is controlled by a motorized drive mechanism (not shown), such as a screw and nut or rack system, controlled by the central electronic and computer system.
  • the clipping device illustrated by the figure 1 further comprises a working module 625 which embeds chamfering and grooving grinders 630, 631 mounted on a common axis 632 and which is movable with a degree of mobility, in a direction substantially transverse to the axis A2 of the shafts 612, 613 maintaining the lens and the axis A5 of the restitution RES.
  • This degree of mobility is called retraction and is noted ESC in the figures.
  • this retraction consists of a pivoting of the working module 625 around the axis A3.
  • the module 625 is carried by a lever 626 integral with a tubular sleeve 627 mounted on the carriage 621 to rotate about the axis A3.
  • the sleeve 627 is provided, at its end opposite the lever 626, a toothed wheel 628 which meshes with a pinion (not visible in the figures) fitted to the shaft of an electric motor 629 integral with the trolley 621.
  • the working module 625 is provided with a cutting module 636 equipped with a cutting tool 637 for making a blank of the clipping by cutting out of the lens material 100 (see figure 1 ).
  • Cutting 637 in full material consists of making penetrate all the diameter of the tool in the lens and move the tool in the lens along a cutting path to obtain the desired cut 110.
  • the desired cutout 110 is an outline desired blank 110 of the same shape as the desired final contour but of larger size.
  • the cutting in full matter is distinguished from the machining of the edge of the lens in the sense that, according to the latter, only a small part of the diameter of the machining tool is engaged in the material of the edge of the lens and the whole material, located between the periphery (or edge) raw lens and the outline of draft to be machined.
  • the cutting tool is here a milling cutter, or cutter, axis A6 substantially parallel to the axis A2 of the shafts 612, 613 (that is to say, the axis of the lens).
  • this cutting tool may consist of a grinding spindle, of smaller diameter than the grinding wheel or roughing cutter, or a laser beam.
  • the cutting bit has a length of 12 mm and is made of tungsten carbide.
  • the diameter of the cutting tool 637 is much smaller than the diameter of the lens.
  • the diameter of the cutter 637 in full material of the lens 100 is preferably less than 4 mm and is typically between 1 and 2 mm.
  • the diameter of the first machining tool or grinding wheel 50 is for example about 155 mm. Otherwise formulated, it can also be considered that the diameter of the cutter 637 is on average from 1 to 6% of the radius of the lens 100 (which is typically of the order of 70 mm).
  • the positioning of the cutting cutter is achieved by means of two pre-existing degrees of mobility which are the retraction ESC on the one hand and the transfer TRA on the other hand.
  • the trimming device 6 comprises an electronic processing unit 130, also called an electronic and computer control system, here consisting of an electronic card designed to coordinate the coordination of the different mobilities of the working tools and the clamping and driving means. rotation of the lens (the holding means) in accordance with the automated trimming method which will be explained later.
  • an electronic processing unit 130 also called an electronic and computer control system, here consisting of an electronic card designed to coordinate the coordination of the different mobilities of the working tools and the clamping and driving means. rotation of the lens (the holding means) in accordance with the automated trimming method which will be explained later.
  • the electronic and computer system 130 comprises, for example, in a conventional manner a motherboard, a microprocessor, a random access memory and a permanent mass memory.
  • the mass memory contains a program for executing the clipping process which will be described later.
  • This mass memory is preferably rewritable and is advantageously removable to allow its rapid replacement or programming on a remote computer via a standard standard interface.
  • the electronic and computer system 130 finally comprises selection means for selecting either the first machining tool 50 of the edge of the lens 100, or the cutting tool 637 of the lens 100, for at least one given clipping operation .
  • the selection means comprise determination means designed to determine which of the first machining tool 50 of the edge of the lens 100 or of the cutting tool 637 of the lens 100 is to be selected.
  • the determination means comprise means for calculating the value of a parameter relating to the lens and / or to the machining and cutting tools and / or relative to the means for holding the lens 100.
  • the means of determination also comprises means for comparing this value with a reference value and are designed to determine which of the first machining tool 50 of the edge or of the cutting tool 637 of the lens 100 is to be selected according to the result of the comparison.
  • the characteristics relating to the optical lens 100 to be trimmed such as the desired final contour 120 and the surface energy of the lens are stored in the electronic processing unit.
  • the surface energy of the lens can be quantified by the wettability angle.
  • this wettability angle is defined as the angle formed between the plane tangent to the surface of the drop of water at a point of contact with this surface. with the lens and the plane tangential to the surface of the lens face at said point of contact with the surface of the drop of water. The larger this angle is, the lower the surface energy and therefore the slippery the lens.
  • a selection is made between either the first machining tool 50 of the edge of the lens 100, or the cutting tool 637 in full material of the lens 100, to perform at least one given clipping operation.
  • the given clipping operation for which said selection is made is here a draft of trimming the lens followed by finishing performed on the second machining tool 55 of the edge of the lens 100.
  • This selection is made as a function of one or more parameters relating to the lens, such as the friction capacities of one or both faces held by the holding means, and / or the thickness and / or the material of the lens. .
  • the selection can also be made as a function of parameters relating to the means for holding the lens, such as the frictional capacities of the holding means.
  • the first category of parameters comprises, for example, the maximum value of the torque that can be applied to the lens 100 without it sliding relative to the holding means 612, 613.
  • This admissible torque value depends both on the means of maintaining, the force with which they are applied against the lens and the surface of the lens.
  • the comparison means compare this calculated maximum value with a reference value. This reference value is, for example, 2 Nm. If this calculated maximum value is greater than the reference value, the first machining tool 50 is selected to proceed with the blanking of the trimming and if this calculated maximum value is lower or equal to the reference value, the cutting tool 637 is selected to proceed with the blanking of the blank cutting clipping. In the latter case, it is said that the optical lens has a low surface energy.
  • wettability angle Another parameter relating to the slipperiness or otherwise of the surface of the lens that can be taken into account for tool selection is the wettability angle. If the wettability angle is greater than 100 degrees, it is considered that the optical lens has a low surface energy and the cutting tool is selected.
  • the lens contains a hydrophobic and / or oleophobic coating which gives each of its surfaces a slipperiness. It follows that the maximum value of the torque that can be applied to the lens 100 without it sliding relative to the holding means 612, 613 is here of the order of 0.3 Nm. in this case you have to select the cutting tool.
  • the selection of the machining tool can be further made depending on the rigidity of the lens. If the thickness and / or the material of the lens may cause deformation of the lens, the tightening of the lens on its support means is reduced and, to prevent slippage of the lens, the tool is selected. cutting to make the clipping blank. The selection can then be made according to a combination of the thickness and the material of the lens.
  • the selection of the machining tool can also be carried out according to the presence or absence, in the composition of the constituent material of the lens, of smelly substances that may be released during machining. This criterion depends primarily on the nature of the constituent material (s) of the lens. For example, most lenses made of a material of medium or high index, that is to say typically of index greater than 1.6, currently contain substances releasing, during machining, smelly substances .
  • the electronic processing unit has or accesses a local or remote register whose registration relates to a material or a category of material and contains, in addition to an identifier of this material or the category of materials, an indicator of the presence, in the composition of the material or the category of materials, of smelly substances that may be released during machining.
  • Another criterion for selecting the machining tool is the desired shape of the final contour of the lens. Indeed, if this shape has one or more portions of concave shape, that is to say that the projection of this contour in a mean plane of the lens has one or more points of inflection, this shape will probably not be obtained by means of a machining tool of the periphery of the conventional lens, such as a grinding wheel or a cutter, the diameter of which is too large to respect the points of inflection.
  • the processing unit proposes to the operator, via an appropriate interface such as a screen associated with a keyboard or the like, to select the cutter for roughing out the lens.
  • the electronic processing unit can also operate this tool selection and the corresponding overflow mode automatically, without resorting to a dialogue with the operator.
  • this mode of edging by cutting in full material reduces the risk of sliding of the lens relative to the means of its maintenance and / or the amount of smelly substances released. It also allows the lens to be unfolded in a contour of complex shape, such as a shape having one or more concave-shaped portions with points of inflection, which can not be formed by a conventional grinding wheel or cutter working around the periphery of the lens. .
  • the electronic processing system 130 appropriately co-ordinates the transfer mobilities TRA of the working module 625 carrying the cutting tool 637, restitution RES of the tightening and rotation shafts 612, 613, d ESC retraction of the working module 625 and ROT rotation of the lens to obtain the mobilities of the cutting tool with respect to the lens necessary to achieve the cutting of the lens.
  • the cutting bit in order to proceed to cutting in full material, is rotated about its axis A6 and positioned along an axis parallel to the lens so as to enter the material of the lens by a transverse displacement.
  • the cutter 637 is also positioned axially so that, during the transverse displacement, it passes through the lens on both sides of its face.
  • the cutter 637 is then moved transversely to the axis of the lens 100 to obtain the desired blank outline 110.
  • the rough outline 110 has the shape of the desired final outline 120 with a slightly larger dimension.
  • the blank outline 110 and the final outline 120 have one or more concave-shaped portions, that is to say the projection of this contour in an average plane of the lens (as illustrated by FIG. figure 2 ) presents (unlike the example illustrated by the figure 2 ) one or more inflection points.
  • the cutting tool in full matter is then selected or, at least, proposed.
  • the blank cutting of the lens comprises the cutting along the radial sectoring lines 105, 106, 107, 108 separating a plurality of peripheral sectors of the lens into several parts.
  • the cut out peripheral sectors of the lens are drop portions 101, 102, 103, 104 which are discarded and the remaining central portion of the lens held by the holding means 612, 613 has the desired blank outline 110.
  • Each falling part is obtained by an input displacement of the cutting tool 637 substantially along a radius of the lens 100 and directed towards the lens center 100, up to the blank outline 110 to be produced, and then by a moving along a portion of the blank contour 110 to be made, and finally by an output displacement of the cutting tool 637 substantially along another radius of the lens 100 and directed in the opposite direction to the lens center 100 until to the disengagement of the cutting tool of the lens.
  • the lens 100 can also be provided to cut the lens 100 by performing several cutting passes.
  • the two faces of the lens are palpated, on the one hand, according to the desired contour and, on the other hand, along the radial sectoring lines.
  • the blank of the lens is then cut into several successive axial passes.
  • the lens is first cut along the radial sectoring lines, each radial sectoring line being subjected to several passes each having a reduced axial depth of pass.
  • the lens is cut according to the desired lens contour. This cut is subjected to several passes each having a reduced axial depth of pass.
  • the axial depths of the cutting passes are adjustable and the depths of the pass may typically be greater for cutting along the radial sectoring lines than for cutting according to the desired final contour.
  • the axial depth of passage of each pass is of course less than the maximum thickness of the lens along the desired contour.
  • the depths and the number of the different passes can advantageously be defined according to the geometric data of lens thickness provided by the probing of the two faces of the lens according to the final contour.
  • the cutting tool 637 is driven axially, that is to say in transfer, according to previously collected probing data.
  • the control of the transfer for the division along the radial sectoring lines is carried out according to the probing data along these sectorization lines.
  • the control of the transfer for the cutting according to the desired final contour is carried out according to the probing along this desired contour.
  • the direction of rotation of the lens 100 (which constitutes the machining advance) is reversed between two cutting passes. It is thus avoided that, in the event that slight sliding in rotation of the lens relative to the means of its maintenance occur, these slips do not accumulate in the same direction.
  • part of a cutting pass is made by rotating the lens relative to the cutting tool in a first direction of rotation and that the complementary portion of the pass is made with a second direction reverse rotation of the first direction of rotation.
  • the finish is then finished by grinding on the finishing wheel 55.
  • the bevelling groove makes it possible, if necessary, to make a bevel on the edge of the lens.
  • the transfer mobilities TRA of the finishing wheel and the restitution mobilities RES and rotation ROT of the lens are controlled so as to reach the desired final contour 120 by removing the small quantity of material situated between the contour of blank 110 obtained by cutting in full material and the desired final contour 120.
  • the grain of the finishing wheel 55 being thin, the desired final contour 120 is reached accurately.
  • the cutter can be steerable.
  • the orientation can be achieved for example by rotation about an axis transverse to the axis of the cutting bit.
  • This cutting bit can also be used for drilling the lens. It can also be replaced by a drill used, on the one hand, for drilling the lens and, on the other hand, in the manner of a cutting cutter to perform the cutting function of the lens as described herein. -before.
  • finishing steps after finishing the trimming on the finishing wheel, can be envisaged such as grooving, drilling and chamfering.
  • the roughing blank wheel can be replaced by a water jet cutting device.
  • the selection means comprise a program and a communication interface with the operator designed to provide a choice of working tool to perform the roughing blank. The operator has then only to choose manually, using the communication interface, the cutting tool or the machining tool that must be used for the roughing blank.

Landscapes

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

Claims (16)

  1. Zuschneideverfahren für ein Brillenglas (100), das mindestens ein Randschleifen entlang einer gewünschten Kontur des von Haltemitteln (612, 613) gehaltenen Brillenglases umfasst, dadurch gekennzeichnet, dass es zur Durchführung des Randschleifens eine Auswahl zwischen einem ersten Bearbeitungswerkzeug (50) für die Kante des Brillenglases (100) und einem Zuschneidewerkzeug (637) zum Schneiden im Werkstoff des Brillenglases (100) in Abhängigkeit eines bzw. mehrerer der folgenden Parameter trifft, die einzeln oder kombiniert betrachtet werden können:
    - ein Parameter hinsichtlich des Brillenglases
    - ein Parameter hinsichtlich dem Bearbeitungs- oder Zuschneidewerkzeug,
    - ein Parameter hinsichtlich den Haltemitteln (612, 613) des Brillenglases
    - ein Parameter hinsichtlich der Form der gewünschten Kontur des Brillenglases.
  2. Zuschneideverfahren nach vorausgehendem Anspruch, bei dem diese Auswahl in Abhängigkeit des Benetzbarkeitswinkels von mindestens einer der Seiten des Brillenglases getroffen wird.
  3. Zuschneideverfahren nach einem der vorausgehenden Ansprüche, bei dem diese Auswahl in Abhängigkeit eines Parameters hinsichtlich des Brillenglases oder einer Kombination eines Parameters hinsichtlich des Brillenglases mit einem Parameter hinsichtlich der Haltemittel (612, 613) des Brillenglases getroffen wird, der den maximalen Wert des Kräftemoments, das auf das Brillenglas (100) angewendet werden kann, ohne dass dieses in Bezug auf die Haltemittel (612, 613) verrutscht, kennzeichnet.
  4. Zuschneideverfahren nach einem der vorausgehenden Ansprüche, bei dem der Parameter hinsichtlich des Brillenglases die Dicke des Brillenglases enthält.
  5. Zuschneideverfahren nach einem der vorausgehenden Ansprüche, bei dem der Parameter hinsichtlich des Brillenglases einen Parameter hinsichtlich dem Werkstoff umfasst, aus dem das Brillenglas ist.
  6. Zuschneideverfahren nach dem vorausgehenden Anspruch, bei dem der Parameter hinsichtlich des Brillenglases einen der folgenden Indikatoren umfasst:
    - Brechzahl des Werkstoffes des Brillenglases,
    - Aussage darüber, ob in der Zusammensetzung des Werkstoffes des Brillenglases übelriechende Substanzen enthalten sind, die während der Bearbeitung freigesetzt werden können.
  7. Zuschneideverfahren nach einem der vorausgehenden Ansprüche, bei dem man zur Durchführung des Randschleifens das Zuschneidewerkzeug (637) zum Schneiden im Werkstoff des Brillenglases (100) auswählt, wenn die Form der gewünschten Kontur des Brillenglases mindestens einen Wendepunkt aufweist und man im entgegengesetzten Fall das erste Bearbeitungswerkzeug (50) für die Kante des Brillenglases (100) auswählt.
  8. Zuschneideverfahren nach einem der Ansprüche 1 bis 6, bei dem man zur Durchführung des Randschleifens das Zuschneidewerkzeug (637) zum Schneiden im Werkstoff des Brillenglases (100) auswählt, wenn die Form der gewünschten Kontur des Brillenglases mindestens einen konkaven Abschnitt aufweist und man im entgegengesetzten Fall das erste Bearbeitungswerkzeug (50) für die Kante des Brillenglases (100) auswählt.
  9. Zuschneideverfahren nach einem der vorausgehenden Ansprüche, bei dem das besagte vorläufige Zuschneiden, für das die Auswahl getroffen wird, eine Rohform ist, die von einer an einem zweiten Bearbeitungswerkzeug (55) für die Kante des Brillenglases durchgeführten Endbearbeitung gefolgt wird, das sich vom ersten Bearbeitungswerkzeug (50) für die Kante des Brillenglases (100) unterscheidet.
  10. Zuschneideverfahren nach einem der vorausgehenden Ansprüche, bei dem der Durchmesser des Zuschneidewerkzeuges (637) zum Schneiden im Werkstoff des Brillenglases (100) geringfügig kleiner ist als der Durchmesser des ersten Bearbeitungswerkzeuges (50) für die Kante des Brillenglases (100).
  11. Zuschneideverfahren nach einem der vorausgehenden Ansprüche, bei dem das Zuschneiden des Brillenglases (110) neben dem Zuschneiden des Brillenglases entlang der gewünschten Kontur auch das Zuschneiden entlang der Linien der radialen Sektoreinteilung umfasst, die eine Vielzahl von peripheren Sektoren (101, 102, 103, 104) abtrennen.
  12. Zuschneideverfahren nach dem vorausgehenden Anspruch, bei dem das Zuschneiden der radialen Linien vor dem Zuschneiden entlang der gewünschten Kontur erfolgt.
  13. Zuschneideverfahren nach einem der Ansprüche 11 und 12, bei dem man vor dem Zuschneiden mindestens eine Seite des Brillenglases entlang der Linien der radialen Sektoreinteilung abtastet und bei dem das Zuschneidewerkzeug (637) während des Zuschneidens in Abhängigkeit der so aufgenommenen Abtastdaten axial gesteuert wird.
  14. Zuschneideverfahren nach einem der vorausgehenden Ansprüche, bei dem diese Auswahl darin besteht, das Zuschneidewerkzeug zu benutzen, wenn mindestens eine Seite des Brillenglases mit einem Mittel beschichtet ist, das der Oberfläche dieser Seite des Brillenglases (100) einen Benetzbarkeitswinkel von über 100 Grad verleiht.
  15. Zuschneidevorrichtung für ein Brillenglas (100) entlang einer gewünschten Kontur, die umfasst:
    - ein erstes Bearbeitungswerkzeug (50) für die Kante des Brillenglases (100),
    - ein Zuschneidewerkzeug (637) zum Schneiden im Werkstoff des Brillenglases (100),
    - Haltemittel (612, 613) für das Brillenglas während des Zuschneidens,
    dadurch gekennzeichnet, dass sie Auswahlmittel umfasst, um für mindestens einen bestimmten Zuschneidevorgang entweder das erste Bearbeitungswerkzeug (50) für die Kante des Brillenglases (100) oder das Zuschneidewerkzeug (637) für das Brillenglas (100) auszuwählen, wobei die Auswahlmittel Bestimmungsmittel umfassen, die so beschaffen sind, dass sie ermitteln können, ob das erste Bearbeitungswerkzeug (50) für die Kante des Brillenglases (100) oder das Zuschneidewerkzeug (637) des Brillenglases in Abhängigkeit eines oder mehrerer der folgenden Parameter auszuwählen ist, welche einzeln oder kombiniert betrachtet werden können:
    - ein Parameter hinsichtlich des Brillenglases
    - ein Parameter hinsichtlich dem Bearbeitungs- oder Zuschneidewerkzeug,
    - ein Parameter hinsichtlich den Haltemitteln (612, 613) des Brillenglases
    - ein Parameter hinsichtlich der Form der gewünschten Kontur des Brillenglases.
  16. Vorrichtung nach Anspruch 15, dadurch gekennzeichnet, dass das Zuschneidewerkzeug (637) für das Brillenglas (100) in Bezug zum Brillenglas entlang einer zur Achse dieses Brillenglases (100) parallelen Richtung beweglich ist und dass sie eine Steuereinheit umfasst, die zum Steuern dieser axialen Beweglichkeit während des Zuschneidens geeignet ist.
EP20070731355 2006-05-10 2007-04-24 Verfahren und vorrichtung zum abgraten einer linse durch schneiden der linse Active EP2018247B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0604133A FR2900853B1 (fr) 2006-05-10 2006-05-10 Procede et dispositif de detourage d'une lentille glissante par decoupage de ladite lentille
FR0604493A FR2900854B1 (fr) 2006-05-10 2006-05-19 Procede et dispositif de detourage d'une lentille par decoupage de ladite lentille
PCT/FR2007/000696 WO2007128904A1 (fr) 2006-05-10 2007-04-24 Procédé et dispositif de détourage d'une lentille par découpage de ladite lentille

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EP2018247B1 true EP2018247B1 (de) 2010-06-23

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EP (2) EP2015896B1 (de)
JP (2) JP5080562B2 (de)
DE (2) DE602007003824D1 (de)
ES (2) ES2346709T3 (de)
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WO (2) WO2007128904A1 (de)

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JP2012531621A (ja) * 2009-06-26 2012-12-10 クインタナ，アレハンドロ アルトゥロ ゲーベル 余剰内部光学材料を有するワンピースレンズ
FR2950163B1 (fr) * 2009-09-15 2012-01-20 Essilor Int Procede et dispositif d'usinage d'une lentille ophtalmique en vue de son montage dans une monture de lunettes
FR2962676B1 (fr) 2010-07-13 2012-08-03 Essilor Int Procede de detourage d'une lentille ophtalmique de lunettes comportant un film de revetement.
FR2972382B1 (fr) * 2011-03-10 2013-04-26 Briot Int Machine de meulage de verres optiques et procede de meulage associe
JP6051699B2 (ja) * 2012-09-04 2016-12-27 株式会社ニデック 眼鏡レンズ加工装置
KR101405838B1 (ko) 2012-11-26 2014-06-11 주식회사 휴비츠 밀링 커터를 이용한 안경 렌즈 가공 장치 및 방법
CN105050768B (zh) * 2013-03-28 2017-03-08 Hoya株式会社 形状分割方法、镜片数据处理方法以及镜片加工方法
JP6063325B2 (ja) * 2013-03-28 2017-01-18 Hoya株式会社 レンズ加工方法、レンズ加工プログラムおよび加工制御装置
FR3008914B1 (fr) * 2013-07-26 2015-09-04 Essilor Int Procede et machine de gravure de lentilles optiques
USD740949S1 (en) * 2013-09-09 2015-10-13 Essilor International (Compagnie Générale d'Optique) Ophthalmic lens edger
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Publication number Publication date
US8128463B2 (en) 2012-03-06
FR2900854B1 (fr) 2009-07-17
US20090064481A1 (en) 2009-03-12
JP2009536102A (ja) 2009-10-08
ES2346709T3 (es) 2010-10-19
JP4971430B2 (ja) 2012-07-11
EP2015896A1 (de) 2009-01-21
FR2900854A1 (fr) 2007-11-16
JP2009536365A (ja) 2009-10-08
US20090068932A1 (en) 2009-03-12
DE602007007317D1 (de) 2010-08-05
EP2015896B1 (de) 2009-12-16
DE602007003824D1 (de) 2010-01-28
WO2007128903A1 (fr) 2007-11-15
US8087150B2 (en) 2012-01-03
WO2007128904A1 (fr) 2007-11-15
EP2018247A1 (de) 2009-01-28
ES2338482T3 (es) 2010-05-07
JP5080562B2 (ja) 2012-11-21

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