EP2822730B1 - Dispositif pour l'usinage fin de surfaces optiquement actives, en particulier sur des verres de lunette, et cellule d'usinage souple comprenant un tel dispositif - Google Patents

Dispositif pour l'usinage fin de surfaces optiquement actives, en particulier sur des verres de lunette, et cellule d'usinage souple comprenant un tel dispositif Download PDF

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Publication number
EP2822730B1
EP2822730B1 EP13702897.3A EP13702897A EP2822730B1 EP 2822730 B1 EP2822730 B1 EP 2822730B1 EP 13702897 A EP13702897 A EP 13702897A EP 2822730 B1 EP2822730 B1 EP 2822730B1
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EP
European Patent Office
Prior art keywords
pivot
drive unit
workpiece
axis
feed device
Prior art date
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Active
Application number
EP13702897.3A
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German (de)
English (en)
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EP2822730A1 (fr
Inventor
Steffen Wallendorf
Holger Schäfer
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.)
Satisloh AG
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Satisloh AG
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Publication of EP2822730A1 publication Critical patent/EP2822730A1/fr
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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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • 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
    • 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
    • B24B13/0031—Machines having several working posts; Feeding and manipulating devices
    • B24B13/0037—Machines having several working posts; Feeding and manipulating devices the lenses being worked by different tools, e.g. for rough-grinding, fine-grinding, polishing
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0084—Other grinding machines or devices the grinding wheel support being angularly adjustable
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/005—Feeding or manipulating devices specially adapted to grinding machines

Definitions

  • the present invention relates generally to a device for fine machining of optically active surfaces according to the preamble of claim 1.
  • the invention relates to a device for fine machining the optically effective surfaces of spectacle lenses, as in so-called "RX workshops", i. Production facilities for the production of individual spectacle lenses are widely used according to prescriptions.
  • the invention relates to a flexible manufacturing cell for processing spectacle lenses, which comprises such a fine processing device.
  • the machining of the optically effective surfaces of spectacle lenses can be roughly subdivided into two processing phases, namely first the pre-processing of the optically effective surface to produce the recipe macrogeometry and then the fine processing of the optically effective surface to eliminate Vorbearbeitungsspuren and obtain the desired microgeometry.
  • the pre-processing of the optically effective surfaces of spectacle lenses inter alia, depending on the material of the lenses by grinding (mineral glass), milling and / or turning (in plastics such as polycarbonate, CR 39, HI index, etc.
  • the optical effective surfaces of spectacle lenses in the fine machining usually subjected to a fine grinding, lapping and / or polishing process, for which one uses a corresponding processing device.
  • Especially hand-fed polishing machines in RX workshops are usually designed as "twin machines", so that advantageously the two lenses of an "RX job" - a lens prescription always consists of a pair of spectacle lenses - can be simultaneously finished.
  • Such a "twin” polishing machine for example, from the preamble of claim 1 forming document US-A-2007/0155287 known.
  • the two piston-cylinder assemblies are further by means of a linear drive together in a direction perpendicular to the axes of rotation of the workpiece spindles with respect to a front side of the polishing machine moved back and forth and also by means of a pivot drive together tiltable about a pivot axis, which is also perpendicular to the axes of rotation of the workpiece spindles , but runs parallel to the front of the polishing machine.
  • a pivot drive By means of the pivot drive, the angular position between the axes of rotation of the tools and workpieces can be preset before the tools are lowered by means of the piston-cylinder assemblies on the workpieces.
  • the workpieces are driven in rotation, which coincides with the Workpieces in machining engagement tools are rotationally driven by friction, while the linear drive causes the tools to be alternately moved back and forth with respect to the front of the polishing machine (oscillatory motion) with the tools moving back and forth across the workpieces with a relatively small travel strip (so-called "tangential kinematics").
  • the linear drive is used to move tools and workpieces so far apart that a change is possible.
  • the invention has for its object to provide a device for fine machining of the optically effective surfaces of particular eyeglass lenses, which requires a comparatively small footprint, so that they can be easily integrated as a module in a flexible manufacturing cell for the lens processing, and also against the eingangertenerten prior art in terms of workpiece and tool change and maintenance and cleaning work is designed ergonomic.
  • the task of the invention further comprises the provision of a cost-effective design flexible manufacturing cell for pre- and fine-processing of spectacle lenses.
  • a device for fine machining of the optically active surfaces on in particular spectacle lenses as workpieces comprising at least one workpiece spindle projecting into a working space, via which a workpiece to be machined is rotatably driven about a workpiece axis of rotation, at least one feed device for a tool by means of the tool is movable toward and away from the workpiece, an oscillation drive unit by means of which the feed device is reciprocally movable in an oscillation direction that is substantially transverse to the workpiece rotation axis during machining, and a pivot drive unit by means of the feed device is pivotable about a pivoting adjusting axis which is substantially perpendicular to the workpiece rotation axis and substantially normal to the oscillation direction; a pivoting mechanism is provided, by means of which the feed device, the oscillation drive unit and the pivot drive unit are pivotable relative to the workpiece spindle from a closing relative position under opening of the working space in an opening relative position and vice versa.
  • the feed device, the oscillation drive unit and the pivot drive unit are more comprehensive, on the tool-side main part of the device with respect to a workpiece-side main part of the device or, in an alternative, the workpiece-side main part of the device with respect to the tool-side main part of the device or, in a further alternative, both main parts of the device from and to each other and swiveled away and vice versa ,
  • the travel paths of the oscillation drive unit compared to the above-described prior art can be significantly shortened without hindering the workpiece or tool change, so that the device according to the invention is significantly more compact and requires a smaller footprint.
  • Workpiece and tool changes are - as well as maintenance and cleaning of the device - compared to the prior art described above also facilitated because a significantly larger opening cross-section is released as a result of the invention pivot under opening of the working space, by an operator and / or if necessary automated grippers, cleaning tools or the like. can easily go into the device or get in there.
  • the pivot according to the invention can advantageously be designed so that it comes to a certain "turning" the respective pivoted main part of the device to the shared opening cross-section, so that the tools or workpieces in the working space not only laterally but also from the front side and thus can be seized safer.
  • the device according to the invention not only has a relatively small footprint but also has a good accessibility to the work space, thus a very ergonomic design, which predestined them overall in particular for use in a flexible manufacturing cell.
  • the kinematic configuration of the device can in principle be taken as in the generic state of the art, in particular with an oscillation drive unit, which during machining the feed device substantially perpendicular to the workpiece axis of rotation in an axial direction back and forth can move, with respect to the operator position or the front of the device back and forth.
  • the oscillatory movement can also take place along or substantially parallel to the front side of the device and / or be realized with a pivoting movement instead of an axial movement.
  • the use of the pivot mechanism according to the invention is independent thereof.
  • pivot mechanism has a common pivot axis for the feed device, the Oszillationsantriebsaku and Schwenkantriebsaku about which the feed device, the Oszillationsantriebsritt and the pivot drive unit are pivoted together with respect to the workpiece spindle and vice versa.
  • the pivot axis lies behind the work space. Compared to a likewise possible arrangement in which the pivot axis is seen from the operator position to the right or left of the working space, this has the advantage that the operator symmetrical ambidextrous unhindered work is possible, so that the device equally well from legal and Left-handed is to use.
  • pivot axis of the pivot mechanism is substantially parallel to the pivoting adjustment axis of the pivot drive unit.
  • the pivot mechanism may comprise a pivot frame with a handle portion over which the feed device, the oscillation drive unit and the pivot drive unit are manually pivotable with respect to the workpiece spindle and vice versa.
  • the swing frame can continue to wear a hood for opening or closing the device. Compared to a conceivable, independent of the pivot mechanism hood this again simplifies the operation of the device.
  • the pivot mechanism may comprise at least one spring element, which facilitates the pivoting away of the feed device, the oscillation drive unit and the pivot drive unit with respect to the workpiece spindle.
  • the at least one spring element e.g., one or more gas springs
  • the at least one spring element may be designed to substantially counterbalance the weight of the parts to be moved away, not only providing a high level of user comfort, but also advantageous in terms of safety at work.
  • a positioning and closing mechanism may be provided which, during operation, holds the feed device, the oscillation drive unit and the pivot drive unit in their closed position and a substantially vertical orientation of the - currently preferred - linear Ensures oscillation with respect to the workpiece axis of rotation.
  • the positioning and closing mechanism can thus advantageously counteract the process forces occurring during processing, for example as a result of the application of a polishing pressure by the infeed device, and at the same time ensure the desired relative position of the moving parts relative to one another, which is particularly the case with the above-mentioned tangential kinematics polishing process with respect to FIG Obtaining reproducible polishing results is important.
  • the positioning and closing mechanism can advantageously comprise a pressure medium cylinder, for example a pneumatic cylinder for holding the feed device, the oscillation drive unit and the swivel drive unit in its closed position, although a positive locking of the swivel mechanism could also be used.
  • the positioning and closing mechanism comprises at least one adjustable, optionally a shock absorber having stop, by means of which the alignment of the oscillation direction with respect to the workpiece axis of rotation is adjustable.
  • a shock absorber has stop, by means of which the alignment of the oscillation direction with respect to the workpiece axis of rotation is adjustable.
  • the optionally available shock absorber can prevent damage to the device if the working space is closed excessively tight.
  • the device further has a work space bounding and supporting the workpiece spindle body, are attached to the two brackets which support the pivot axis of the pivot mechanism, wherein the Oszillationsantriebsö has a guide block which is pivotally mounted between the brackets on the pivot axis ,
  • a component of the oscillation drive unit is thus also used for the pivoting mechanism.
  • the oscillation drive unit may comprise two guide rods longitudinally slidably mounted in the guide block, a guide head and a guide plate, the guide rods being interconnected on one side of the guide block via the guide head, while being interconnected on the other side of the guide block via the guide plate , and wherein the guide head is displaceable by means of a screw drive relative to the guide block.
  • the Oszillationsantriebsaku can be advantageously formed by a commercially available linear rod guide whose carriage is "fixed” as a guide block pivotally mounted on the pivot axis of the pivot mechanism, with high functional integration in the guide block.
  • the swing drive unit has a swing yoke supporting the feed device pivotally supported on the guide head of the oscillation drive unit, with a lift module disposed between the guide plate of the oscillation drive unit and the swing yoke is, by means of which the pivot yoke is pivotable about the pivoting adjusting axis.
  • two workpiece spindles projecting into the working space can be provided for constructing a "twin" machine, which are rotationally drivable via a belt drive about the workpiece axes of rotation, which comprises a belt pulley rotatable by a rotary drive, a belt and a tensioning device. and pulley for the belt, which sits between the workpiece spindles and is mounted on the rotary drive eccentric to the pulley, so that the belt can be tensioned by pivoting the rotary drive.
  • These measures are also conducive to maintaining a very compact design, in addition to tensioning the belt no additional components are necessary, the latter is possible only by mere rotation or pivoting of the rotary drive.
  • the device described above as a single machine, ie not used in a machine network, it must of course have a device for human-machine communication and a suitable controller, such as a PC-based CNC control, which controls their drive modules / Achsantriebe.
  • a suitable controller such as a PC-based CNC control, which controls their drive modules / Achsantriebe.
  • a flexible manufacturing cell for the pre- and fine processing of spectacle lenses comprises (1) a device for pre-machining the optically effective surfaces of the spectacle lenses by milling, turning and / or grinding, the controlled or controlled drive axes for workpiece and / or tool, each with associated drive module, and (2) a device for fine machining of the optically effective surfaces of the lenses by polishing, namely the device described above, which has controlled or controlled drive axes for workpiece and / or tool, each associated with Drive module, and which is as a module to the device for pre-processing - at least electrically, possibly also mechanically - docked, with the further special feature that only the device for pre-processing has a device for man-machine communication and a CNC control which the drive modules both devices drives.
  • the electrical connection between the CNC control and the drive modules can take place here by means of individual wiring or via a bus system.
  • the device for finishing without means for man-machine communication and own CNC control can be made very inexpensive and especially in smaller RX workshops - possibly also subsequently - be added without great effort as a module to the device for pre-processing.
  • Fig. 1 is a flexible manufacturing cell for the pre- and fine-processing of spectacle lenses L in RX workshops generally numbered 10.
  • the flexible manufacturing cell 10 comprises a device for preprocessing the optically effective surfaces cc, cx (cf. Fig.
  • polishing machine 14 which is mechanically and electrically docked as a module to the generator 12, as will be described in more detail later ,
  • the structure and function of the polishing machine 14, which is embodied in the illustrated exemplary embodiment in a "twin" construction, will be explained, so that two lenses L can be polished at the same time.
  • the generator 12 may be mentioned at this point only that this can be designed as a pure fast-tool lathe or combined milling lathe, as in principle, for example, from the publications EP-A-1 719 573 and EP-A-1 719 585 are known.
  • these machines is - possibly after a milling pre-processing of the lenses L, such as in the pamphlet EP-A-0 758 571 described a rotary chisel 16 by means of a fast tool servo either linearly reciprocating (oscillation axis F D ) or rotationally highly dynamically moved to generate a feed movement on the turning tool 16 for the processing of non-rotationally symmetrical spectacle lens surfaces, while the lens L rotating to produce a cutting force is driven (workpiece rotation axis B D ) and at the same time a relative movement between turning tool 16 and lens L transverse to the oscillation axis F D (linear axis X D ) to effect a feed from the lens edge to the lens center or vice versa.
  • the polishing machine 14 generally has (i) two workpiece spindles 20 projecting from below into a working space 18, via which the spectacle lenses L to be machined can be rotationally driven about workpiece axes of rotation C1, C2, (ii) two feed devices 22 for each one tool W.
  • an oscillation drive unit 24 by means of which the feed devices 22 in an oscillation direction (linear oscillation axis X ), ie, in the present case, can be moved back and forth with respect to a front side of the polishing machine 14, wherein the axis of oscillation X extends substantially transversely to the workpiece axes of rotation C1, C2 during machining, and (iv) a swivel drive unit 26, by means of which the feed devices 22 can be pivoted about a pivot axis B, which essentially is perpendicular to the workpiece axes of rotation C1, C2 and substantially normal to the axis of oscillation X.
  • the polishing machine 14 also has a pivot mechanism 28, by means of which the feed devices 22, the oscillation drive unit 24 and the pivot drive unit 26 relative to the workpiece spindles 20 from a closing relative position (FIG. Fig. 2 . 4 . 6 . 8th . 10 and 12 to 14 ) opening the working space 18 into an opening relative position ( Fig. 1 . 3 . 5 . 7 . 9 and 11 ) can be swung away and vice versa, namely according to the arrow S (pivoting movement) in the Fig. 4 to 9 .
  • the pivoting movement S for the feeders 22, the Oszillationsantriebsaku 24 and the pivot drive unit 26 together, namely about a common pivot axis 30 (see, in particular Fig. 14 ) of the pivoting mechanism 28, which, viewed from an operator position, lies behind the working space 18 and runs essentially parallel to the pivoting adjusting axis B.
  • the polishing machine 14 has a machine frame 32 composed of metal sheets as a welded construction, which at the same time forms part of a machine housing in which not only the drive units and mechanisms visible here but also the supply devices, control components, etc. (not shown) are accommodated.
  • the machine housing is completed by covering parts 34 and a hood 36 which consists at least partially of Plexiglas (PMMA) and is transparent and can also be pivoted by means of the pivoting mechanism 28 relative to the machine frame 32.
  • PMMA Plexiglas
  • a basic body 38 Inserted into the machine housing is also a basic body 38 which is also assembled as a welded construction from metal sheets and which delimits the working space 18, in particular downwards in the figures, and carries the workpiece spindles 20 there.
  • the main body 38 has laterally angled flange portions 40, which are placed on associated bearing surfaces 42 of the machine frame 32 and screwed thereto (not shown) to secure the main body 38 in the polishing machine 14.
  • Fig. 1 shows the machine housing of the polishing machine 14 with respect to its shape to the machine housing of the generator 12 adapted so that the flexible manufacturing cell 10 has an overall appearance "as if in one piece". Mechanically, in this case the machine frame 32 of the polishing machine 14 is screwed to the machine frame of the generator 12 (not shown).
  • brackets 46 are attached from the rear to a rear wall 44 of the base body 38 at the same vertical height but with horizontal distance from each other.
  • Each holder 46 has a support base 48, with which the respective holder 46 is screwed to the base body 38 (not shown), and two of the support base 48 still upwardly extending support arms in mirror-symmetrical arrangement from holder to holder, namely a shorter - with respect to the Space between the brackets 46 - "inner” bracket arm 50 and a longer "outer” bracket arm 52nd
  • brackets 46 initially carry the pivot axis 30, as the FIGS. 13 and 14 can be seen. More specifically, according to Fig. 14 two screws 54 are provided, each of which engages through a through hole 56 formed in the respective inner support arm 50 near the support base 48 and is screwed into an associated threaded bore 58 of the pivot shaft 30 at the end to fix the pivot axis 30 between the supports 46.
  • a guide block 60 of the oscillation drive unit 24 is pivotally mounted between the brackets 46 via two bearing elements 62 which are mounted in a staggered by the pivot axis 30, stepped through hole 64 in the guide block 60.
  • the pivot mechanism 28 in the illustrated embodiment two spring elements, here gas springs 66th which facilitate the pivoting away of the upper, tool-side main part of the polishing machine 14 with respect to the workpiece spindles 20, including the feed devices 22, the oscillation drive unit 24 and the pivot drive unit 26.
  • the gas springs 66 are each hinged at one end to the free end of the outer support arm 52 of the respective associated holder 46, as best in the Fig. 8 to 10 and 14 can be seen.
  • the other end of the respective gas spring 66 is articulated to a respectively associated lower extension 68 of the guide block 60 of the oscillation drive unit 24.
  • the spring force of the gas pressure springs 66 and their articulation points which determine the lever arm about the pivot axis 30 are selected such that the torque generated by the weight of the pivoted components or groups about the pivot axis 30 is substantially counteracted.
  • the swivel mechanism 28 is associated with a positioning and closing mechanism 70, which holds the upper, tool-side body with the feeders 22, the oscillating drive unit 24 and the pivot drive unit 26 in the closed position during machining and a substantially vertical alignment of the oscillation axis X with respect to the Workpiece rotation axes C1, C2 guaranteed.
  • the positioning and closing mechanism 70 initially comprises a pressure medium cylinder, more precisely a pneumatic cylinder 72 for holding the pivotable about the pivot axis 30 components in their closed position, which has a cylinder housing 74 and a piston connected to a piston of the pneumatic cylinder 72 piston rod 76 extending from the cylinder housing 74 extends.
  • the cylinder housing 74 of the pneumatic cylinder 72 is hinged to a bracket 78, which in turn on the support base 48 of the in the Fig. 6 to 9 left bracket 46 is attached, via screws not shown here.
  • the piston rod 76 of the pneumatic cylinder 72 is at the in the Fig. 8 and 9 left, lower extension 68 of the guide block 60 hinged.
  • a torque is generated (clockwise in Fig. 13 ), which presses said components or groups in the direction of the workpiece spindles 20.
  • the positioning and closing mechanism 70 further comprises two adjustable stops 80, each having a shock absorber 82 (in the simplest form, for example, a rubber buffer) and serve, in the closed position, the alignment of the oscillation axis X with respect to the workpiece axes of rotation C1, C2 to adjust, and this may for example have a thread which cooperates with a mating thread (not shown). How best in the Fig.
  • the adjustable stops 80 are mounted with the respective shock absorber 82 at the free ends of the inner support arms 50 of the brackets 46, in such a way that each shock absorber 82 can come into abutment in the closed position on an associated abutment surface 84, which at a further lateral, upper extension 86 of the guide block 60 is formed.
  • the guide block 60 is formed with its lower extensions 68 and its upper extensions 86 with respect to a central axis mirror-symmetrical.
  • the extensions 68, 86 may be integrally formed with the rest of the guide block 60 or attached thereto in a suitable manner.
  • the pivoting mechanism 28 further includes a pivotal frame 88 which is a multi-arched and upwardly angled sheet metal part.
  • the swing frame 88 is not shown here in kind and attached from below to the guide block 60 of the oscillation drive unit 24.
  • a handle portion 90 is attached, on the basis of the fixed connection of the swing frame 88 to the guide block 60, the Oszillationsantriebstechnik 24 and carried therefrom components or groups, in particular the pivot drive unit 26 and feeders 22 manually about the pivot axis 30 with respect to Workpiece spindles 20 can be pivoted away and vice versa.
  • the swing frame 88 also carries in Fig. 1 shown hood 36 for opening or closing the polishing machine 14th
  • the guide block 60 has a central, relative to the front of the polishing machine 14 rear recess 100 for receiving and fixing a servomotor 102 on the guide block 60.
  • a servomotor 102 on the guide block 60.
  • Starting from the recess 100 extends through a central, stepped through-hole 104 through the guide block 60 through the one driven by the servo motor 102 rotatably driven threaded spindle 106 of a ball screw extends through it.
  • the guide block 60 further has on both sides of the through hole 104 each have a continuous bearing bore 108 which extends parallel to the through hole 104 and the inclusion of a pair of ball bushes (not shown in detail) is used.
  • two guide rods 110 are mounted longitudinally displaceably in the guide block 60 by means of the ball bush pairs.
  • the guide rods 110 are over at the end a guide plate 112 connected to each other, which has a central recess for the passage of the servo motor 102 (see Fig. 4 and 6 ), while the guide rods 110 are connected to each other on the other side of the guide block 60 end via a guide head 114.
  • a guide head 114 is in accordance with the Fig. 4 and 10 a nut 116 of the ball screw attached, with which the threaded spindle 106 engages.
  • the guide head 114 with the guide rods 110 and the guide plate 112 by means of the driven by the servo motor 102 ball screw 106, 116 relative to the guide block 60 is axially displaceable.
  • a driver 118 for the metal slide 96 of the bellows covers 94 is attached on the guide head 114.
  • a pivot shaft 120 is rotatably mounted on the guide head 114, to which a pivot yoke 122 of the pivot drive unit 26 is attached.
  • the swivel drive unit 26 also has a lifting module 124 which is described in the publication EP-A-2 298 498 is described in detail, with respect to the structure and function of the lifting module 124 to avoid repetition.
  • the lifting module 124 is articulated at its one end to the guide plate 112 of the oscillation drive unit 24, while it is articulated at its other end at a distance from the pivot shaft 120 on the pivot yoke 122.
  • the swinging yoke 122 pivotally mounted on the guide head 114 of the oscillation drive unit 24 can be pivoted in a defined manner around the pivot shaft 120 by operation of the lift module 124 in which the length thereof changes (swing adjustment axis B).
  • the pivot yoke 122 of the pivot drive unit 26 further carries the feeders 22. More specifically, the substantially U-shaped pivot yoke 122 according to the particular Fig. 4 . 5 and 13 on both sides on its legs receiving portions 126 to which the feeders 22 are attached, so that the feeders 22 in common can be pivoted about the pivot shaft 120 with the pivot yoke 122 (pivot axis B).
  • the feed devices 22 include in the illustrated embodiment, two-sided acting pneumatic tool cylinder 128 - sometimes referred to as "quills" - which are known per se and therefore require no further description. In these tool cylinders 128, the polishing tools W, which are also known per se, are held free-running and pivotable at the free ends of their piston rods.
  • the polishing tool W can be lifted from the spectacle lens L by suitable pressurization of the tool cylinder 128 or lowered onto the spectacle lens L and pressed against it (linear movements Z1, Z2), the polishing tool W being driven by the spectacle lens L.
  • Another embodiment of Zustell insightfulen- possibly also with rotary drive for the polishing tool, as in the document EP-A-2 298 498 described - is however also conceivable.
  • the workpiece spindles 20 are flange-mounted in the working space 18 from above on the base body 38 and pass through this each with a drive shaft 130 and an actuating mechanism for a collet at 132, by means of a lens L locked on a block piece (not shown in detail) axially fixed and capable of rotation on the respective workpiece spindle 20 can be clamped.
  • pneumatic cylinders 134 can be seen in the figures, which serve to open or close the collets 132 in a manner known per se.
  • the projecting into the working space 18 workpiece spindles 20 are of the rotary drive 136 together via a belt drive 140 at a predetermined speed about the workpiece axes of rotation C1, C1 rotatably driven.
  • the belt drive 140 according to the Fig. 6 .
  • a pulley or pinion 144 driven by the rotary drive 136, a belt 146 - which is a timing belt in the illustrated embodiment - and a tension and deflection pulley 148 for the belt 146.
  • the clamping and deflection roller 148 is seated between the workpiece spindles 20 and is mounted on the rotary drive 136, more precisely, the motor flange 138 eccentrically to the pulley 144, so that the belt 146 can be clamped by pivoting the rotary drive 136 about its axis of rotation.
  • the rotary drive 136 itself is screwed to the base body 38 with the aid of screws (and possibly nuts, both not shown), which pass through curved slots (also not shown) formed in the motor flange 138 or in the base body 38, which pivot the rotary drive 136 for tensioning the belt 146 before tightening the screw allow.
  • the above-described polishing machine 14 allows, for example, the following procedure, which is to be described only for a lens L, because the second lens L of the respective "RX job" in an analogous manner and at the same time polished.
  • This angle of attack is not changed in the initially mentioned “tangential kinematics" during the actual polishing processing (alternatively, the angle of attack could also be changed dynamically in the sense of a "radial kinematics”).
  • the polishing tool W is moved by means of the oscillation drive unit 24 in a position in which it is opposite the lens L (Oszillationsachse X). Thereafter, the polishing tool W is axially lowered by means of the feed device 22 in the direction of the spectacle lens L until it comes into contact therewith (linear movement Z1, Z2). Now, the polishing agent supply is turned on, and the lens L is rotated by means of the electric rotary drive 136 in rotation (C1, C2), taking with it the applied polishing tool W.
  • the polishing tool W is oscillated by means of the oscillation drive unit 24 with relatively small strokes over the spectacle lens L (oscillation axis X), so that the polishing tool W is guided over different surface regions of the spectacle lens L.
  • the polishing tool W of the (non-circular) geometry on the polished spectacle lens L also moves slightly up and down (linear movement Z1, Z2).
  • the polishing tool W is lifted off the spectacle lens L by means of the feed device 22 (linear movement Z1, Z2) after the polishing agent supply has been switched off and the rotational movement of the spectacle lens L has been stopped (workpiece rotational axes C1, C2).
  • the polishing tool W is moved by means of the oscillation drive unit 24 in a rear parking position (Oszillationsachse X), whereupon the upper part of the polishing machine 14 swung about the pivot axis 30 (pivotal movement S) and the lens L can be easily removed from the polishing machine 14.
  • the closing or holding function perceived by the positioning and closing mechanism 70 more precisely its pneumatic cylinder 72, can otherwise be secured by a safety limit switch (not shown), which ensures that the polishing process can be started only when the machine upper part is closed, ie lowered ,
  • Fig. 15 Finally, in a schematic way, a particularly cost-effective control architecture of the flexible manufacturing cell 10 according to Fig. 1 shown.
  • the polishing machine 14 is connected to the generator 12 via electrical connections 150 (eg a bus system) as a module.
  • electrical connections 150 eg a bus system
  • the generator 12 has a device for human-machine communication HMI and a CNC control, in the illustrated embodiment in the form of a PC-based control, which the drive modules (servo amplifier / inverter) of both the generator 12 and the polishing machine 14 drives.
  • the polishing machine 14 does not have its own “intelligence" here, but only that for generating the actual travel commands for the controlled or controlled axes - ie the position-controlled oscillation axis X of the oscillation drive unit 24 for the polishing tools W (short: X-axis) Pivot axis B of the rotary drive unit 26 for the polishing tools W (in short: B axis) and the speed-controlled axis of rotation C1, C2 of the lenses L holding and driven by the rotary drive 136 workpiece spindles 20 (short: C axis) - required electrical components.
  • a polishing machine for spectacle lenses comprises at least one workpiece spindle projecting into a working space for rotationally driving the spectacle lens about a workpiece axis of rotation, at least one feed device for lowering or lifting a polishing tool relative to the spectacle lens, an oscillation drive unit for reciprocating the feed device in an oscillation direction which is substantially transverse to the workpiece rotation axis in the polishing machining, and a pivot drive unit for pivoting the feed device about a pivoting adjusting axis that is substantially perpendicular to the workpiece rotation axis and substantially normal to the oscillation direction.
  • a pivoting mechanism is provided, by means of which the feed device, the oscillation drive unit and the pivot drive unit are pivotable relative to the workpiece spindle from a closing relative opening of the working space in an opening relative position and vice versa.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (15)

  1. Dispositif (14) pour l'usinage de finition de surfaces (cc, cx) produisant une action sur le plan optique, notamment sur des verres de lunettes en guise de pièce d'oeuvre (L), comprenant
    au moins une broche porte-pièce (20) s'engageant dans un espace de travail (18), et par l'intermédiaire de laquelle une pièce (L) à usiner peut être entraînée en rotation autour d'un axe de rotation de pièce (C1, C2),
    au moins un dispositif d'avance (22) pour un outil (W), au moyen duquel l'outil (W) peut être déplacé en direction de la pièce (L) et éloigné de celle-ci (Z1, Z2),
    une unité d'entraînement d'oscillation (24) au moyen de laquelle le dispositif d'avance (22) peut être déplacé en va-et-vient dans une direction d'oscillation (X), qui, lors de l'usinage, s'étend sensiblement de manière transversale par rapport à l'axe de rotation de pièce (C1, C2), et
    une unité d'entraînement de pivotement (26) au moyen de laquelle le dispositif d'avance (22) peut pivoter autour d'un axe de déplacement de pivotement (B), qui s'étend sensiblement de manière perpendiculaire à l'axe de rotation de pièce (C1, C2) et sensiblement de manière normale à la direction d'oscillation (X), caractérisé par un mécanisme de pivotement (28) au moyen duquel le dispositif d'avance (22), l'unité d'entraînement d'oscillation (24) et l'unité d'entraînement de pivotement (26) peuvent être pivotés par rapport à la broche porte-pièce (20) en s'en éloignant, d'une position relative de fermeture à une position relative d'ouverture avec ouverture de l'espace de travail (18), et inversement (S).
  2. Dispositif (14) selon la revendication 1, caractérisé en ce que le mécanisme de pivotement (28) présente pour le dispositif d'avance (22), l'unité d'entraînement d'oscillation (24) et l'unité d'entraînement de pivotement (26), un axe de pivotement commun (30) autour duquel le dispositif d'avance (22), l'unité d'entraînement d'oscillation (24) et l'unité d'entraînement de pivotement (26) peuvent être pivotés par rapport à la broche porte-pièce (20) en s'en éloignant et inversement (S).
  3. Dispositif (14) selon la revendication 2, caractérisé en ce que l'axe de pivotement (30) est situé, vu à partir de la position d'un utilisateur de service, derrière l'espace de travail (18).
  4. Dispositif (14) selon la revendication 2 ou la revendication 3, caractérisé en ce que l'axe de pivotement (30) s'étend sensiblement de manière parallèle à l'axe de déplacement de pivotement (B).
  5. Dispositif (14) selon l'une des revendications précédentes, caractérisé en ce que le mécanisme de pivotement (28) comporte un cadre de pivotement (88) avec un tronçon formant poignée (90), par l'intermédiaire duquel le dispositif d'avance (22), l'unité d'entraînement d'oscillation (24) et l'unité d'entraînement de pivotement (26) peuvent être pivotés manuellement par rapport à la broche porte-pièce (20) en s'en éloignant et inversement (S).
  6. Dispositif (14) selon la revendication 5, caractérisé en ce que le cadre de pivotement (88) porte un capot (36) pour ouvrir et respectivement fermer le dispositif (14).
  7. Dispositif (14) selon l'une des revendications précédentes, caractérisé en ce que le mécanisme de pivotement (28) comporte au moins un élément de ressort (66), qui facilite le pivotement (S) du dispositif d'avance (22), de l'unité d'entraînement d'oscillation (24) et de l'unité d'entraînement de pivotement (26) par rapport à la broche porte-pièce (20) en s'en éloignant.
  8. Dispositif (14) selon l'une des revendications précédentes, caractérisé par un mécanisme de positionnement et de fermeture (70), qui, pendant l'usinage, maintient le dispositif d'avance (22), l'unité d'entraînement d'oscillation (24) et l'unité d'entraînement de pivotement (26) dans leur position de fermeture, et garantit une orientation sensiblement perpendiculaire de la direction d'oscillation (X) s'étendant linéairement, par rapport à l'axe de rotation de pièce (C1, C2).
  9. Dispositif (14) selon la revendication 8, caractérisé en ce que le mécanisme de positionnement et de fermeture (70) comprend un vérin à fluide de pression (72) pour assurer le maintien du dispositif d'avance (22), de l'unité d'entraînement d'oscillation (24) et de l'unité d'entraînement de pivotement (26) dans leur position de fermeture.
  10. Dispositif (14) selon la revendication 8 ou la revendication 9, caractérisé en ce que le mécanisme de positionnement et de fermeture (70) comprend au moins une butée réglable (80) présentant le cas échéant un amortisseur (82), au moyen de laquelle il est possible d'ajuster l'orientation de la direction d'oscillation (X) par rapport à l'axe de rotation de pièce (C1, C2).
  11. Dispositif (14) selon l'une des revendications 2 à 10, caractérisé par un corps ou bâti de base (38) délimitant l'espace travail (18) et portant la broche porte-pièce (20), et sur lequel sont fixés deux supports (46), qui portent l'axe de pivotement (30), l'unité d'entraînement d'oscillation (24) comportant un bloc de guidage (60), qui est monté entre les supports (46) de manière à pouvoir pivoter autour de l'axe de pivotement (30).
  12. Dispositif (14) selon la revendication 11, caractérisé en ce que l'unité d'entraînement d'oscillation (24) comporte deux tiges de guidage (110) montées en coulissement longitudinal dans le bloc de guidage (60), une tête de guidage (114) et une plaque de guidage (112), les tiges de guidage (110) étant reliées l'une à l'autre, sur un côté du bloc de guidage (60), par l'intermédiaire de la tête de guidage (114), tandis que sur l'autre côté du bloc de guidage (60), elles sont reliées mutuellement par la plaque de guidage (112), et la tête de guidage (114) peut être déplacée par rapport au bloc de guidage (60) au moyen d'un entraînement à vis (106, 116).
  13. Dispositif (14) selon la revendication 12, caractérisé en ce que l'unité d'entraînement de pivotement (26) possède un berceau de pivotement (122), qui porte le dispositif d'avance (22) et est monté pivotant sur la tête de guidage (114) de l'unité d'entraînement d'oscillation (24), un module de course de déplacement (124) étant agencé entre la plaque de guidage (112) de l'unité d'entraînement d'oscillation (24) et le berceau de pivotement (122), au moyen duquel le berceau de pivotement (122) peut pivoter autour de l'axe de déplacement de pivotement (B).
  14. Dispositif (14) selon l'une des revendications précédentes, caractérisé par deux broches porte-pièce (20) s'engageant dans l'espace de travail (18) et pouvant être entraînées en rotation autour des axes de rotation de pièce (C1, C2) par l'intermédiaire d'un ensemble d'entraînement à courroie (140), qui possède une poulie de courroie (144) pouvant tourner sous l'effet d'un entraînement de rotation (136), une courroie (146) et une poulie de renvoi et de tension (148) pour la courroie (146), qui est placée entre les broches porte-pièce (20) et est montée sur l'entraînement de rotation (136) de façon excentrée par rapport à la poulie de courroie (144) de manière à ce que la courroie (146) puisse être tendue par pivotement de l'entraînement de rotation (136).
  15. Cellule de fabrication flexible (10) pour l'usinage d'ébauche et de finition de verres de lunettes (L), comprenant
    un dispositif (12) pour l'usinage d'ébauche par fraisage, tournage et/ou rectification, des surfaces (cc, cx) produisant une action sur le plan optique, des verres de lunettes (L), qui présente des axes d'entraînement commandés ou régulés (BD, FD, XD) pour la pièce et/ou l'outil, avec un module d'entraînement respectivement associé, et
    un dispositif (14) pour l'usinage de finition par polissage, des surfaces (cc, cx) produisant une action sur le plan optique, des verres de lunettes (L), selon l'une des revendications précédentes, qui présente des axes d'entraînement commandés ou régulés (B, C1, C2, X) pour la pièce et/ou l'outil, avec un module d'entraînement respectivement associé, et qui est arrimé, en tant que module, au dispositif (12) pour l'usinage d'ébauche,
    seul le dispositif (12) pour l'usinage d'ébauche possédant un système pour la communication homme-machine ou interface homme-machine (HMI) et une commande numérique CNC, qui pilote les modules d'entraînement des deux dispositifs (12, 14).
EP13702897.3A 2012-03-10 2013-01-29 Dispositif pour l'usinage fin de surfaces optiquement actives, en particulier sur des verres de lunette, et cellule d'usinage souple comprenant un tel dispositif Active EP2822730B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012004547A DE102012004547A1 (de) 2012-03-10 2012-03-10 Vorrichtung zur Feinbearbeitung von optisch wirksamen Flächen an insbesondere Brillengläsern und flexible Fertigungszelle umfassend eine solche Vorrichtung
PCT/EP2013/000249 WO2013135331A1 (fr) 2012-03-10 2013-01-29 Dispositif pour l'usinage fin de surfaces optiquement actives, en particulier sur des verres de lunette, et cellule d'usinage souple comprenant un tel dispositif

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EP2822730A1 EP2822730A1 (fr) 2015-01-14
EP2822730B1 true EP2822730B1 (fr) 2016-03-23

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US (1) US9321145B2 (fr)
EP (1) EP2822730B1 (fr)
CN (1) CN104169045B (fr)
BR (1) BR112014019939A8 (fr)
DE (1) DE102012004547A1 (fr)
HK (1) HK1203891A1 (fr)
IN (1) IN2014DN07304A (fr)
MX (1) MX349334B (fr)
WO (1) WO2013135331A1 (fr)

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DE102015102899B4 (de) 2015-02-27 2018-02-01 Optotech Optikmaschinen Gmbh Fräsvorrichtung für die Brillenglasfertigung mit zwei Frässtationen
CN105364667B (zh) * 2015-11-19 2019-02-12 长春博信光电子有限公司 一种双曲面高速抛光机
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CN109397008B (zh) * 2018-12-03 2023-11-07 厦门理工学院 一种新型镜片数控切割机及控制方法
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DE102012004547A1 (de) 2013-09-12
US9321145B2 (en) 2016-04-26
CN104169045A (zh) 2014-11-26
US20150038061A1 (en) 2015-02-05
CN104169045B (zh) 2017-06-27
BR112014019939A8 (pt) 2017-07-11
WO2013135331A1 (fr) 2013-09-19
HK1203891A1 (en) 2015-11-06
EP2822730A1 (fr) 2015-01-14
BR112014019939A2 (fr) 2017-06-20
IN2014DN07304A (fr) 2015-04-24
DE102012004547A8 (de) 2013-11-14
MX349334B (es) 2017-07-24
MX2014009364A (es) 2014-11-21

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