EP2298498A2 - Dispositif de traitement précis de surfaces à effet optique, notamment sur des verres de lunettes - Google Patents

Dispositif de traitement précis de surfaces à effet optique, notamment sur des verres de lunettes Download PDF

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Publication number
EP2298498A2
EP2298498A2 EP10008121A EP10008121A EP2298498A2 EP 2298498 A2 EP2298498 A2 EP 2298498A2 EP 10008121 A EP10008121 A EP 10008121A EP 10008121 A EP10008121 A EP 10008121A EP 2298498 A2 EP2298498 A2 EP 2298498A2
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EP
European Patent Office
Prior art keywords
spindle
housing
tool
rotary drive
axis
Prior art date
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Withdrawn
Application number
EP10008121A
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German (de)
English (en)
Inventor
Bernd Schüssler
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Satisloh AG
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Satisloh AG
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Publication date
Application filed by Satisloh AG filed Critical Satisloh AG
Publication of EP2298498A2 publication Critical patent/EP2298498A2/fr
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    • 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

Definitions

  • the present invention relates generally to a device for fine machining of optically active surfaces according to the preamble of claim 1. More particularly, the invention relates to a device for fine machining the optically effective surfaces of spectacle lenses, as used in so-called "RX workshops", i. Production facilities for the production of individual spectacle lenses are widely used according to prescriptions.
  • 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 active surfaces of spectacle lenses inter alia, depending on the material of the spectacle lenses by grinding, milling and / or turning
  • the optically effective surfaces of spectacle lenses in the finishing usually a fine grinding, Lapping and / or polishing process, what to use a corresponding machine.
  • 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 rotationally driven, with the tools in working engagement with the workpieces being frictionally entrained 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, the tools having a relatively small path constantly moving back and forth over the workpieces (so-called "tangential kinematics").
  • the forming the preamble of claim 1 DE-A-102 50 856 discloses in this connection a polishing apparatus (see Figs Fig. 5 to 9 ) with a rotary electric drive for the polishing tool, which as such has a stator and a rotor, and with a pneumatic piston-cylinder unit for axial deflection of the polishing tool along a longitudinal axis.
  • the arrangement of the rotary and axial drives is made such that a rotatably mounted in a housing about a rotation axis spindle shaft assembly ("rotor" in the linguistic use of the above document), which at their extending from the housing end the actual polishing tool, is rotatably driven by a toothed belt drive of the electric rotary drive, which is laterally offset in the housing, arranged parallel to the axis of rotation; the pneumatic piston-cylinder unit and an associated axial guide, however, are integrated in the spindle shaft assembly, thus rotationally driven, which is why the piston-cylinder unit for supplying pressure medium requires a compressed air rotary feedthrough.
  • this polishing device is constructed relatively expensive, it is also not suitable because of their large space requirement for use in the above-described "twin" polishing machine.
  • the invention has for its object to provide a simple and inexpensive constructed device for fine machining of the optically effective surfaces of particular eyeglass lenses, driven by the example, a polishing tool rotationally and axially displaced and yet is very compact, so that they are approximately in a very narrow "twin" polishing machine, such as The polishing machine described above, can be used.
  • the device is advantageously compact.
  • the spindle shaft can be directly rotated without any play or slip-prone transmission elements, such as gears, timing belts.
  • the relative arrangement of axial adjustment and electrical rotary drive made such that, together with the rotationally driven spindle shaft, at least the rotor of the electric rotary drive in the direction of the axis of rotation is axially displaceable relative to the spindle housing.
  • the device according to the invention is eminently suitable for use in e.g. the above-described "twin" polishing machine, so that using other polishing methods with rotationally driven polishing tools, the processing times can be significantly reduced (ie, divisor 3), without increasing the low complexity of this polishing machine over charge or their space or space requirement at all to enlarge.
  • stator or rotor of the electric rotary drive With a suitably long training of stator or rotor of the electric rotary drive, it is basically possible to make the arrangement so that only the rotor of the electric actuator is axially displaced by means of the adjusting device, while the stator is axially stationary.
  • the rotor and the stator of the electric rotary drive in the direction of the tool axis of rotation relative to each other immovable in a common motor housing are received, wherein the axial adjusting device operatively connected to the motor housing and thus the motor housing together with the spindle shaft with respect to the spindle housing in the direction of the tool rotation axis is axially displaceable.
  • the adjusting device is a piston-cylinder arrangement which can be acted upon pneumatically on both sides and which has a piston rod via which the axial displacement movement is transferable to the electric rotary drive and which is axially aligned with the spindle shaft.
  • the latter feature is not only conducive again to a compact design of the overall device, but also prevents tilting moments are transmitted from the axial adjustment to the spindle shaft, which could hinder a smooth axial displacement of the spindle shaft with respect to the spindle housing.
  • the axial movement of the spindle shaft should be very smooth, so that even with low delivery forces or polishing a low-friction delivery of the held on the tool receiving portion of the spindle shaft polishing tool is possible.
  • This property is particularly important for the polishing of spectacle lenses with toric, atoric or progressive surfaces with high deviation from the rotational symmetry, so that the polishing tool always full or flat and with sensitive adjustable polishing force (or contact force) rests on the lens. If, in fact, the polishing tool would lose the surface contact to the workpiece surface during its high-speed rotary motion only for a short time, the coarser grains and agglomerates present in the polishing agent could cause scratching of the polished spectacle lens surface.
  • the piston rod of the axial Adjustment device for transmitting the axial displacement movement with the electric rotary drive preferably via a diaphragm cylinder having a membrane operatively connected.
  • a diaphragm cylinder works even stick-slip-free and also allows small axial strokes on the electric rotary drive and thus the spindle shaft, without that the piston rod of the adjusting would have to perform a Axialhub.
  • the membrane may be formed annular disk-shaped, wherein the membrane is mounted on the inner circumference of the piston rod of the adjusting and the outer peripheral side is clamped on the electric rotary drive, so that the power flow of an axial force applied to the piston rod extends from the piston rod via the membrane in the electric rotary drive.
  • the annular disc-shaped membrane it is also possible - albeit less preferred - to attach the annular disc-shaped membrane on the inner peripheral side of the electric rotary drive and to keep the outer peripheral side of a suitably shaped piston rod.
  • the membrane may be e.g. be made of a spring steel.
  • the membrane consists of an elastomeric material. This has the advantage that, due to its elasticity, the membrane can also be stretched in the radial direction, i. can compensate perpendicular to the tool axis of rotation, so that the membrane can also compensate for misalignment and gimbal errors between piston rod and spindle shaft, which could lead to jamming of the spindle shaft, in a simple and effective way.
  • the piston rod of the axial adjusting device may be provided with a through hole which pneumatically connects a pressure chamber of the adjusting device facing away from the tool receiving portion with a pressure chamber of the diaphragm cylinder facing the tool receiving portion, wherein the pneumatic active surfaces facing each other in said pressure chambers are essentially the same size.
  • the spindle shaft is rotatably mounted on the inner circumference of a spindle sleeve, which in turn is guided axially on its outer circumference with respect to the spindle housing, so that advantageously the pivot bearing and the axial guide are functionally separated in a small space.
  • a spindle sleeve e.g. Sliding bushes or air bushings are used.
  • the spindle sleeve is guided axially by means of guides in the form of ball bushings in the spindle housing, which is advantageous in terms of ease, longevity and cost in total.
  • the spindle sleeve may also be formed in one piece with the motor housing. Here, however, it is preferred in terms of ease of manufacture and assembly when the spindle sleeve is flanged to the motor housing of the electric rotary drive.
  • the spindle housing can have a housing lower part which is close to the tool receiving section of the spindle shaft and a housing upper part with different inner diameters which is remote from the tool receiving section of the spindle shaft, the spindle sleeve being reduced in diameter Lower housing part is guided axially, while the motor housing of the electric rotary drive in the larger diameter upper housing part piston-like, but with radial clearance to the spindle housing is axially displaceable.
  • This embodiment has the advantage that the axial guide is close to the tool, so that, for example, machining-induced bending vibrations of the spindle shaft are largely avoided, and on the other hand the advantage that the motor housing of the electric rotary drive via the radial gap to the spindle housing during an axial movement of the motor housing Air movement or an air exchange is forced, which contributes to the cooling of the electric rotary drive.
  • the upper housing part and lower housing part of the spindle housing can be formed in one piece or in two parts.
  • the latter is advantageous in that the production is easier and different materials for the housing parts can be used, for example, an aluminum alloy for the upper housing part to optimize the weight (keyword: as low moving masses), and for example stainless steel for the lower part to To give the latter strength and corrosion resistance.
  • the motor housing can be secured against rotation relative to the spindle housing by means of a torque arm, one end of which is fixed to the motor housing, while the other end a rotatable mounted roller bears, which bears against a spindle housing side tread.
  • torque arm and the spindle housing axially guided spindle sleeve are arranged with respect to the motor housing axially opposite sides, which in turn, in turn, a compact and slim design of the device is conducive - although it is also conceivable in principle, close or even to provide on the spindle sleeve for a torque support to the spindle housing.
  • polishing machine (i) a machine housing defining a working space, (ii) two workpiece spindles projecting into the working space, over the two lenses to be polished (iii) a linear drive unit, by means of which a tool carriage is movable along a linear axis which is substantially perpendicular to the workpiece axes of rotation, and (iv) has a swivel drive unit, which is arranged on the tool carriage and by means of a pivot yoke about a pivoting adjusting axis is pivotable, which is substantially perpendicular to the workpiece axes of rotation and substantially perpendicular to the linear axis; in such a way that the two devices, with their tool receiving sections in each case one of the workpiece spindles, project into the working space and are flange-mounted with their spindle housings on the pivot yoke so that the tool rotation
  • Such a trained and equipped "twin" polishing machine is characterized not only by the fact that it is very compact - inasmuch as it is easy to load manually - and in a very cost effective way many common drives uses, but in particular by the fact that by the Movement options provided according to the invention, namely the active rotational movement possibility of the polishing tools mounted thereto, compared to the prior art described at the outset the implementation of other, especially faster or more time-efficient polishing process allows.
  • a device 10 described below in detail for fine machining of the optically effective surfaces on workpieces, such as lenses L - a polishing machine in "twin" construction, ie numbered for simultaneous polishing of two lenses L with 12.
  • the polishing machine 12 generally has (i) a working space 14 limiting machine housing 16, which is mounted on a machine frame 18, (ii) two projecting into the working space 14 workpiece spindles 20, on the two lenses to be polished L by means of a common rotary drive 22 (see the Fig. 3 to 5 ) about mutually parallel workpiece axes of rotation C1, C2 (C in Fig.
  • a linear drive unit 24 by means of which a tool carriage 26 can be moved along a linear axis X, which extends substantially perpendicular to the workpiece axes of rotation C1, C2,
  • a pivot drive unit 28 which on the Tool carriage 26 is arranged and by means of a pivot yoke 30 can be pivoted about a pivot axis B, which is substantially perpendicular to the workpiece axes of rotation C1, C2 and substantially perpendicular to the linear axis X, and finally (v) two of the above already mentioned devices 10.
  • each of the devices 10 comprises generally (a) a spindle shaft 32 having a tool receiving portion 34 and in a spindle housing 36 about a tool axis of rotation A1, A2 (A from Fig.
  • an electric rotary drive 38 having a rotor 40 and a stator 42 and by means of which the rotor 40 operatively connected to the spindle shaft 32 about the tool rotation axis A1, A2 (A) can be driven to rotate
  • an axial adjustment device 44 by means of which the tool receiving portion 34 with respect to the spindle housing 36 in the direction of the tool rotation axis A1, A2 (A) can be displaced or moved axially (linear movement Z1, Z2 or Z from Fig. 6 ).
  • Essential features of the device 10 are in this case that the rotor 40 and the stator 42 of the electric rotary drive 38 are arranged coaxially with the spindle shaft 32, and that by means of the adjusting device 44, at least the rotor 40 of the electric rotary drive 38, in the illustrated embodiment even the entire electric rotary drive 38 together with the spindle shaft 32 with respect to the spindle housing 36 in the direction of the tool axis of rotation A1, A2 (A) can be moved axially (linear motion Z1, Z2 and Z), as will also be described in more detail below.
  • the devices 10 are now flanged with their spindle housings 36 on the pivot yoke 30 of the polishing machine 12 that they project with their tool receiving portions 34 each one of the workpiece spindles 20 in the working space 14, wherein the tool axis of rotation A1, A2 of each device 10 with the Workpiece rotation axis C1, C2 of the associated workpiece spindle 20 forms an imaginary plane (perpendicular to the plane of the drawing Fig. 4 and parallel to the plane of the drawing Fig.
  • FIG. 2 machine housing 16 mounted obliquely on the machine frame 18 is designed as a welded sheet-metal housing, comprising a bottom plate 48, a cover plate 50, two side walls 52, a rear wall 56 bevelled to a drain 54 provided in the bottom plate 48, and a front wall 58 which in total comprises the working space 14 limit. While the side walls 52 and the front wall 58 are provided with windows 60, in the bottom plate 48 there are round recesses (not shown) for passing the workpiece spindles 20 and a drive shaft 61 of the rotary drive 22 and elongated recesses 62 in the cover plate 50 (see FIGS Fig. 2 to 4 ) provided for the passage of the devices 10.
  • the elongated recesses 62 also allow for an axial back and forth movement of the devices 10 in the direction of the linear axis X, ie in the direction of the front wall 58 and away therefrom, wherein for sealing against the working space 14 in the illustrated embodiment each have a bellows cover 64 as a flexible working space cover is provided.
  • the workpiece spindles 20 are flanged in the working space 14 from above on the bottom plate 48 and pass through these each with a drive shaft 66 and an actuating mechanism 68 for a collet 70, by means of a blocked on a block piece S lens L axially fixed and capable of rotation can be clamped to the respective workpiece spindle 20 (see. Fig. 11 ).
  • actuating mechanism 68 for a collet 70, by means of a blocked on a block piece S lens L axially fixed and capable of rotation can be clamped to the respective workpiece spindle 20 (see. Fig. 11 ).
  • 72 fortified pneumatic cylinders of the actuating mechanisms 68 are numbered below the bottom plate 48, by means of which the collets 70 can be opened or closed in a known per se.
  • a speed-controlled asynchronous three-phase motor - also flanged from above on the bottom plate 48.
  • pulleys 74 are further attached to the drive shafts 61, 66 of rotary drive 22 and workpiece spindles 20 and operatively connected by means of a V-belt 76, so that the rotary drive 22 at the same time both workpiece spindles 20 rotatably drive at a predetermined speed (workpiece axes of rotation C1, C2 or C).
  • the linear drive unit 24 in the illustrated embodiment comprises a driven by a servo motor 78 via a clutch ball screw 80 which is received in a mounted on top of the cover plate 50 guide box 82 on which the tool carriage 26 is guided.
  • This essentially horizontal linear axis X is CNC-controlled; however, to simplify the illustration, the associated displacement measuring system is not shown.
  • Fig. 1 to 4 is the substantially U-shaped pivot yoke 30 with his legs on in the Fig. 1 and 2 hinged to the front end of the tool carriage 26 so that it can pivot about the pivoting adjustment axis B.
  • the pivot drive unit 28 is articulated so that it can pivot about an axis 84.
  • the swivel drive unit 28 is a commercially available linear module, as can be obtained, for example, from the company SKF under the name "lifting cylinder CARE 33".
  • linear modules which are used in large numbers, for example as automatic window openers or for the adjustment of hospital beds, have a lifting rod 86, which can be extended or retracted via a spindle drive (not shown in detail) driven by a DC motor 88.
  • a spindle drive (not shown in detail) driven by a DC motor 88.
  • the self-locking of the spindle drive is so large that the lifting rod 86 remains in its once approached position even under greater axial loads when the DC motor 88 is turned off without it od a brake or the like.
  • the lifting rod 86 of the rotary drive unit 28 is now facing away from the DC motor 88 end in a middle, in the Fig.
  • the electrical rotary drive 38 of the device 10-in the illustrated exemplary embodiment a synchronous three-phase motor-is speed-controlled (tool rotation axes A1, A2, or A).
  • the linear movement of the polishing tool 46 in the direction Z1, Z2 or Z which can be effected by means of the axial adjustment device 44 of the device 10, is uncontrolled and unregulated.
  • This movement possibility serves to bring the polishing tool 46 into contact with the spectacle lens L before the actual polishing operation, to press the polishing tool 46 toward the spectacle lens L during the polishing operation with a predetermined force to produce a polishing pressure, and the polishing tool 46 after the polishing operation Polishing process to lift off the lens L again.
  • the above-described polishing machine 12 allows, for example, the following procedure, which should 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.
  • the angle of rotation of the tool axes of rotation A1, A2 or A with respect to the workpiece axes of rotation C1, C2 or C is first by means of the pivot drive unit 28 as a function of the processed Geometry on the lens L set to a predetermined value (pivot axis B). This angle of attack is not changed during the actual polishing.
  • the polishing tool 46 is moved by means of the linear drive unit 24 in a position in which it is opposite the lens L (linear axis X). Thereafter, the polishing tool 46 is displaced axially by means of the adjusting device 44 of the device 10 in the direction of the spectacle lens L until it comes into contact therewith (linear movement Z1, Z2 or Z). Now the polish supply is switched on, and the polishing tool 46 and the spectacle lens L are rotated by means of the electric rotary drive 38 and the rotary drive 22 (tool rotation axes A1, A2 and A, workpiece rotation axes C1, C2 and C, respectively).
  • a synchronous synchronization takes place between the tool and the workpiece;
  • the polishing tool 46 is oscillated by means of the linear drive unit 24 with relatively small strokes over the spectacle lens L (linear axis X), so that the polishing tool 46 is guided over different surface regions of the spectacle lens L.
  • the polishing tool 46 moves the (non-circular) geometry on the polished spectacle lens L also slightly up and down (linear movement Z1, Z2 and Z).
  • polishing tool 46 is lifted off the spectacle lens L by means of the adjusting device 44 of the device 10 (linear movement Z1, Z2 or Z) after the polishing agent supply has been switched off and the rotational movements of the tool and workpiece have been stopped (tool rotation axes A1, A2 or A; Workpiece rotation axes C1, C2 or C). Finally, the polishing tool 46 is driven by the linear drive unit 24 to a position (linear axis X), which allows the lens L to be taken out of the polishing machine 12.
  • the spindle housing 36 is made in two parts, with the tool receiving portion 34 of the spindle shaft 32 near sleeve-like housing part 92 and a tool receiving portion 34 of the spindle shaft 32 distant, substantially cup-shaped housing upper part 94, wherein the lower housing part 92 and the upper housing part 94 are formed hollow cylindrical with different inner diameters ,
  • the housing lower part 92 is in the region of an opening 96 flanged in the bottom of the upper housing part 94 with the aid of screws 98 on the upper housing part 94.
  • a flange 100 to see the device 10 on the pivot yoke 30 of the polishing machine 12 can be flanged left or right side, then three cylinder screws pass through the pivot yoke 30 and are screwed into associated threaded blind holes in the flange 100, such as especially the Fig. 3 and 4 reveal.
  • a substantially tubular spindle sleeve 102 at its outer periphery by means of one or more guides - in the illustrated embodiment in the form of two ball bushings 104 - axially guided largely free of radial play with respect to the spindle housing 36, while in the larger diameter housing top 94 a substantially cup-shaped motor housing 106th of the electric rotary drive 38 piston-like, but with radial clearance R (see Fig. 9 ) is received axially displaceably to the spindle housing 36.
  • the upper housing part 94 is dimensioned such that the motor housing 106 can be axially displaced in the spindle housing 36 with a stroke of approximately 60 mm.
  • the spindle sleeve 102 is on the motor housing 106 of the electric rotary drive 38 in the region of an opening 108 in the bottom of the motor housing 106 with the aid of screws 110 (see again Fig. 9 ) flanged.
  • the spindle shaft 32 On the inner circumference of the spindle sleeve 102, the spindle shaft 32 is rotatably mounted near its two ends by means of a respective bearing 112, for example a ball bearing.
  • the spindle shaft 32 passes completely through the spindle sleeve 102 and stands in the Fig. 9 to 11 below, in particular with its tool receiving portion 34 on the spindle sleeve 102, while protruding in the aforementioned figures in the top of the motor housing 106.
  • a labyrinth seal in the form of a plugged onto the spindle sleeve 102, by means of a grub screw 114 (FIG. Fig. 9 ) clamped bellows 116 and a plugged onto the spindle shaft 32, by means of another grub screw 118 (FIG. Fig. 9 ) clamped and with the spindle shaft 32 rotating baffle plate 120. Both parts (116 and 120) of the labyrinth seal are sealed by means of an O-ring 122 relative to the spindle shaft 32 and the spindle sleeve 102.
  • a sealing ring 124 such as an elastomeric V-sealing ring used.
  • a bellows 126 each in an annular groove at the lower end of the housing base 92 and the bellows ring 116 by means of clamps 128 (FIGS. Fig. 7 ) attached.
  • the rotor 40 and the stator 42 of the electric rotary drive 38 are housed together and in the direction of the tool axis of rotation A relative to each other immovable.
  • the adjusting device 44 is operatively connected to the motor housing 106, as will be described in more detail, so that the motor housing 106 with the spindle sleeve 102 and the spindle shaft 32 mounted therein with respect to the spindle housing 36 in the direction of the tool axis of rotation A is axially displaceable (linear movement Z ).
  • the stator 42 of the electric rotary drive 38 Inside the motor housing 106, the stator 42 of the electric rotary drive 38, whose windings only in Fig. 11 are indicated, with the motor housing 106 shed.
  • the electric rotary drive 38 is air-cooled and has for this purpose in the upper region of the rotor 40, a fan (not shown).
  • a fan not shown.
  • bores 130 ( Fig. 9 ) in the bottom of the motor housing 106 during an axial movement (linear movement Z) of the electric rotary drive 38 provided for an air exchange (eg with each charging process). In this axial movement thus the air flows through the electric rotary drive 38 and cools the rotor 40 and stator 42.
  • This air exchange can additionally by a laterally attached to the bottom of the housing top 94, leading to the interior of the spindle housing 36 auxiliary air connection 132 (FIGS. 6 and 7 ) are supported by means of compressed air, whereby if necessary, a permanent air cooling of the electric rotary drive 38 can take place. If necessary, to determine such a need, a thermal sensor 134 ( Fig. 9 ) be provided.
  • the spindle shaft 32 carries the rotor 40, which is rotatably connected there in a suitable manner, for example by means of a ring-clamping element 136 or other known shaft-hub connection with the spindle shaft 32.
  • the associated clamping screws 138 serve at the same time the attachment of the fan (not shown).
  • the motor housing 106 In the Fig. 9 to 11 closed at the top, the motor housing 106 by a bearing plate 140 which is fixed by means of a mounted in an annular groove of the motor housing 106 Seeger ring 142.
  • Fig. 9 are energy and thermal sensor cable 144 of the electric rotary drive 38, which incidentally has a large, continuously variable speed range, led out via an opening in the bearing plate 140 by means of a cable gland 146 from the device 10.
  • the energy and thermal sensor cables 144 are first guided in a U-shaped bend 147 to a further cable gland 148, which in turn is fastened to a mounting bracket 150 bolted to the upper housing part 94.
  • a mounting flange 152, the housing upper part 94 in the Fig. 9 to 11 closes at the top and screwed to it (not shown in detail), finally forms an upper stop for the motor housing 106 in these figures.
  • axial adjustment device 44 is a two-sided pneumatically acted piston-cylinder assembly having a piston rod 154, via which the axial displacement movement (linear movement Z) is transferable to the electric rotary drive 38 and which is axially aligned with the spindle shaft 32 ,
  • a bridge-like support structure is provided which consists of an upper, plate-shaped cylinder bearing 156 and two on both sides thereof arranged, plate-shaped guide members 158.
  • the guide members 158 are mounted by means of countersunk screws (not shown) on the mounting flange 152, while the cylinder bearing 156 is screwed to the guide members 158 by means of cap screws 160 (see Fig. 7 ).
  • the axial adjustment device 44 further comprises a cylinder tube 162, which is fastened by means of two long cylinder screws 164 and a cylinder cover 166 on the cylinder bearing 156, by clamping between cylinder bearing 156 and cylinder cover 166.
  • a piston 168 is received longitudinally displaceable, on which the piston rod 154 is mounted, which extends sealed by means of a provided in the cylinder cover 166 sealing stripper ring 170 through the cylinder cover 166 therethrough.
  • the sealing of the cylinder tube 162 by means of O-rings 172, which are each mounted in the cylinder bearing 156 and the cylinder cover 166 in an annular groove.
  • the piston 168 separates in the cylinder tube 162 a cylinder bearing side pressure chamber 174, which via a transverse bore (not shown, starting from the pressure port 175 in the 6, 7 and 9 ) in the cylinder bearing 156 can be pressurized to extend the tool receiving portion 34 of the spindle shaft 32, from a cylinder cover side pressure chamber 176, which (not shown, via a provided in the cylinder cover 166 transverse bore, starting from the pressure port 177 in the Fig. 6 to 11 ) is pressurizable to retract the tool receiving portion 34.
  • Fig. 9 to 11 is the piston rod 154 of the axial adjustment device 44 for transmitting the axial displacement movement (linear movement Z) with the electric rotary drive 38 via a membrane 178 having a diaphragm cylinder 180 operatively connected.
  • the bearing plate 140 of the electric rotary drive 38 at its in the Fig. 9 to 11 upper side with a circular, trough-shaped depression which forms a lower pressure chamber 182 of the diaphragm cylinder 180 in these figures.
  • a likewise provided with a depression diaphragm cover 184 is provided, which is bolted to the bearing plate 140 while the membrane 178 to form a in the Fig. 9 to 11 upper chamber 186 (see Fig.
  • the diaphragm 178 which is made of an elastomeric material, is formed annular disc-shaped. In this case, it is on the inner peripheral side by means of an annular bead 188 (see Fig. 11 ), which is clamped between two discs via a screwed into the piston rod 154, hollow-bored screw (by means of annular grooves on the discs) attached to the piston rod 154 of the adjusting 44, while the membrane 178 on the outer circumference by means of a ring bead 190 (see again the Fig.
  • the piston rod 154 of the axial adjustment device 44 has a through hole 192 which connects the remote from the tool receiving portion 34 of the spindle shaft 32 pressure chamber 174 of the adjusting device 44 with the tool receiving portion 34 facing the pressure chamber 182 of the diaphragm cylinder 180 pneumatically. Since the mutually facing pneumatic active surfaces in the said pressure chambers 174, 182 are substantially the same size, the forces acting on the diaphragm 178 mutually cancel each other when pressure is applied to the pressure chamber 174 of the adjusting device 44.
  • the motor housing 106 of the electric rotary drive 38 is secured against rotation relative to the spindle housing 36 by means of a torque arm 194, one end of which is fixed to the motor housing 106, while its other end carries a rotatably mounted pulley 196 mounted on a spindle housing side tread 198 is applied.
  • a torque arm 194 is screwed to an annular cover plate 200, which in turn is bolted to the bearing plate 140, as the Fig. 9 can be seen, bearing plate 140 and cover plate 200 seize the Seeger ring 142 between them.
  • the torque arm 194 and the housing lower part 92 of the spindle housing 36 axially guided spindle sleeve 102 are arranged with respect to the motor housing 106 axially opposite sides.
  • the spindle-housing-side running surface 198 is formed by a longitudinal groove in the corresponding guide part 158, which constitutes, as it were, a slotted guide for the roller 196.
  • the polishing tool 46 held on the tool receiving section 34 of the spindle shaft 32 by means of a grub screw is also shown by way of example.
  • This can in principle correspond to the polishing tools described in the already mentioned publications EP-A-1 473 116 . DE-A-10 2005 010 583 and EP-A-2 014 412 are disclosed.
  • the cavity in the polishing tool 46 is not actively pressurized, but is filled, for example, with a fluid (gas or silicone oil).
  • a polishing plate 204 is held interchangeable on the polishing tool 46.
  • polishing plates 204 are for example the publication DE-A-10 2007 026 841 the present applicant to remove; the interface 202 essentially corresponds to that in the older German patent application DE 10 2009 036 981.3 the present applicant presented and described interface. In this respect, reference should be made at this point to the cited documents.
  • Fig. 11 For simplicity, the motor housing 106 of the electric rotary drive 38 to stop at the bottom of the upper housing part 94 of the spindle housing 36 is shown. However, such a relative position of these parts is not achieved in reality. Rather, the motor housing 106 is always at least slightly spaced from the bottom of the upper housing part 94 during the polishing process.
  • a special feature of the device is that the Rotor and the stator are arranged coaxially with the spindle shaft, wherein by means of the adjusting at least the rotor together with the spindle shaft with respect to the spindle housing in the direction of the tool axis of rotation is axially displaceable, which in particular requires a very compact design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP10008121A 2009-09-16 2010-08-04 Dispositif de traitement précis de surfaces à effet optique, notamment sur des verres de lunettes Withdrawn EP2298498A2 (fr)

Applications Claiming Priority (1)

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DE102009041442A DE102009041442A1 (de) 2009-09-16 2009-09-16 Vorrichtung zur Feinbearbeitung von optisch wirksamen Flächen an insbesondere Brillengläsern

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WO2022144189A1 (fr) * 2020-12-30 2022-07-07 Satisloh Gmbh Procédé et dispositif d'usinage de précision de lentilles axicon, machine d'usinage de précision appropriée et utilisation y relative

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DE102011014230A1 (de) 2011-03-17 2012-09-20 Satisloh Ag Vorrichtung zur Feinbearbeitung von optisch wirksamen Flächen an insbesondere Brillengläsern
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WO2022144189A1 (fr) * 2020-12-30 2022-07-07 Satisloh Gmbh Procédé et dispositif d'usinage de précision de lentilles axicon, machine d'usinage de précision appropriée et utilisation y relative

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MX2010009770A (es) 2011-03-30
US8696410B2 (en) 2014-04-15
US20110065361A1 (en) 2011-03-17
CN102069437A (zh) 2011-05-25
DE102009041442A1 (de) 2011-03-24

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