EP4470717A1 - Dispositif de polissage de surface optique de lentille optique, machine de polissage et procédé de polissage - Google Patents

Dispositif de polissage de surface optique de lentille optique, machine de polissage et procédé de polissage Download PDF

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Publication number
EP4470717A1
EP4470717A1 EP23176169.3A EP23176169A EP4470717A1 EP 4470717 A1 EP4470717 A1 EP 4470717A1 EP 23176169 A EP23176169 A EP 23176169A EP 4470717 A1 EP4470717 A1 EP 4470717A1
Authority
EP
European Patent Office
Prior art keywords
polishing
polishing machine
crown
spindle
drive shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP23176169.3A
Other languages
German (de)
English (en)
Other versions
EP4470717B1 (fr
EP4470717C0 (fr
Inventor
Igor Morozov
Alexander DOROFEEV
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.)
Optodor GmbH
Original Assignee
Optodor GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Optodor GmbH filed Critical Optodor GmbH
Priority to EP23176169.3A priority Critical patent/EP4470717B1/fr
Priority to CN202410673544.8A priority patent/CN119057619A/zh
Priority to US18/678,012 priority patent/US20240399533A1/en
Publication of EP4470717A1 publication Critical patent/EP4470717A1/fr
Application granted granted Critical
Publication of EP4470717B1 publication Critical patent/EP4470717B1/fr
Publication of EP4470717C0 publication Critical patent/EP4470717C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/16—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces performing a reciprocating movement, e.g. during which the sense of rotation of the working-spindle is reversed
    • 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
    • B24B13/02—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made
    • B24B13/026—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made the contact between tool and workpiece being a line
    • 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
    • B24B13/01—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools
    • 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
    • B24B13/04—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing
    • 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
    • B24B13/06—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes
    • 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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/02—Lapping machines or devices; Accessories designed for working surfaces of revolution
    • 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
    • B24B41/002—Grinding heads
    • 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
    • B24B47/225—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses
    • 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
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power

Definitions

  • the invention relates to a device for polishing an optical surface of optical lenses, wherein at one end of the device a connecting element for attachment to a polishing machine is provided and at another end of the device a polishing wheel with an axially arranged drive shaft running radially to a longitudinal center axis of a spindle of the polishing machine is arranged, and wherein the device has a crown or bevel gear with which the polishing wheel can be driven by means of a rotating part of the spindle of the polishing machine via the drive shaft.
  • lens blanks are used that are first prefabricated by machining. Due to the relatively high roughness of the optical surfaces that this creates, they must then be polished, which on the one hand reduces the roughness and on the other hand creates the fine contour of the optical surface.
  • the EP 2 837 464 B1 describes a polishing method for processing an optical surface of an optical lens and suitable polishing tools.
  • a polishing surface of a polishing wheel placed on the surface of the lens which is set in rotation about a wheel axis and a rotation axis running perpendicular to the wheel axis, is moved over the surface of the lens along a spiral processing path, wherein the speed of the polishing wheel is reduced about the wheel axis and/or the rotation axis in the spiral center of the movement path.
  • the invention is based on the object of proposing a device for polishing an optical surface of a lens, a polishing machine with such a device and a method for polishing, with which the adjustment of the shape and profile of the polishing impression on optically effective surfaces of lenses is made possible depending on the required polishing removal, wherein the dimensional accuracy and the optical quality of the lenses are further improved during contouring and surface-finishing polishing and the roughness of the optical surfaces is further reduced.
  • the crown or bevel gear is formed from a pinion gear arranged at one end of the drive shaft and a crown or bevel gear rotatably mounted on a fixed bearing sleeve of the device running coaxially to the spindle of the polishing machine, wherein on an outer circumference of the crown or bevel gear, a further toothing is provided, with which the polishing wheel can be driven via the drive shaft via a gear driven by a separate drive motor.
  • the additional drive by means of the separate drive motor, which drives the crown or bevel gear or the crown or bevel gear and the pinion gear the drive shaft of the polishing wheel via the gear, changes the transmission ratio between the crown or bevel gear and the gear of the polishing wheel, which changes the speed of the polishing wheel. This can further improve the dimensional accuracy and the optical quality of the lenses during contouring and surface-finishing polishing of lenses, and the roughness of the optical surfaces of the lenses can also be further reduced.
  • the connecting element can have a bearing pin on an end of the connecting element facing the polishing machine, which can be received and held by a clamping system of the rotating part of the spindle of the polishing machine, wherein an assembly frame for receiving and storing the polishing wheel can be provided on an end of the connecting element facing away from the polishing machine.
  • the clamping system ensures rapid adaptation of the device to the polishing machine, so that increased workload for mounting the device on the polishing machine is almost impossible.
  • the coaxial arrangement of the bearing pin of the connecting element to the clamping system of the rotating part of the spindle ensures exact concentricity of the connecting element and the polishing wheel when the spindle rotates and optimal power transmission from the spindle to the polishing wheel.
  • the assembly frame of the connecting element can also provide a certain degree of protection for the polishing wheel against possible external influences.
  • the clamping system can be a hydraulic expansion chuck, which, with its high clamping force, ensures a secure and permanent hold of the connection element of the device or the entire device on the spindle of the polishing machine.
  • the hydraulic expansion clamping system ensures a very high concentricity of the connection element and thus of the polishing wheel.
  • the drive shaft of the polishing wheel can be mounted on the side legs of the U-shaped mounting frame.
  • the U-shaped mounting frame ensures relatively simple mounting of the drive shaft and the polishing wheel on or in the frame, and if necessary, the polishing wheel can also be replaced relatively easily and quickly.
  • the drive shaft can protrude beyond the mounting frame on one side, whereby the pinion gear can be mounted on the protruding part of the drive shaft.
  • the pinion gear and thus the polishing wheel can be driven via the spindle when the drive motor is at a standstill and the crown or bevel gear is blocked, whereby the polishing wheel rotates radially around the longitudinal center axis of the spindle on the one hand and axially around the longitudinal center axis of the drive shaft and the pinion gear mounted on it on the other.
  • the pinion gear rolls on the crown or bevel gear.
  • the pinion wheel and thus the polishing wheel can be driven by the drive motor when it is operating via the gear of the drive motor that drives the crown or bevel gear, whereby the polishing wheel rotates axially around the longitudinal center axis of the drive shaft and the pinion wheel mounted on it.
  • the polishing wheel is driven by the spindle, whereby the polishing wheel rotates radially around the longitudinal center axis of the spindle. This changes the transmission ratio and the speed of the polishing wheel.
  • the drive motor can control the speed and direction of rotation independently of the spindle of the polishing machine.
  • the polishing wheel can be mounted with little play between the two side legs of the mounting frame. Due to the compact design of the mounting frame of the connecting element and the little play between the two side legs of the mounting frame, debris and excess polishing agent can hardly settle anywhere.
  • the polishing wheel can have an elastic rubber coating on its outer circumference, whereby the elastic rubber coating can have a convex surface on its outer circumference. Due to the convex rubber coating and its elasticity, the rubber coating with its polishing surface adapts at least approximately in a form-fitting manner to the surface of the respective lens.
  • the bearing sleeve can have a holding device for the drive motor, in or on which the drive motor can be arranged with its longitudinal center axis parallel to the longitudinal center axis of the spindle of the polishing machine.
  • the polishing machine according to the invention for polishing an optical surface of optical lenses comprises a device according to the invention.
  • a device according to the invention for the advantageous effects of the polishing machine according to the invention, reference is made to the description of the advantages of the device according to the invention.
  • the polishing wheel with its elastic rubber coating is first placed on the surface of the lens, followed by a rotation of the spindle of the polishing machine about its longitudinal axis with the crown or bevel gear blocked and simultaneous rotation of the polishing wheel about the longitudinal central axis of the spindle the polishing machine and the longitudinal center axis of the drive shaft, whereby the pinion wheel rolls on the blocked crown or bevel gear with a constant transmission ratio.
  • the transmission ratio between the crown or bevel gear and the pinion wheel is then changed while the speed and/or direction of rotation of the polishing wheel is changed at the same time by operating the drive motor.
  • the direction of rotation of the drive motor can be switched, which means the speed of the polishing wheel can be changed.
  • the speed of the drive motor can also be changed.
  • the in Fig. 1 The device 1 shown is intended for polishing an optical surface 2 of optical lenses 3, such as aspheres, spheres, flat and free-form surfaces, spectacle lenses, etc., and is preferably attached to a CNC-controlled polishing machine 4.
  • the device 1 has a connecting element 5 at one end, which is provided with a bearing pin 6 at the end directed towards the polishing machine 4.
  • the bearing pin 6 of the connecting element 5 is intended to establish a connection and force transmission between the polishing machine 4 and the device 1 and can be received and held by a clamping system 7, which can be a hydraulic chuck, for example, of a rotating part 8 of a spindle 9 of the polishing machine 4.
  • a polishing wheel 11 provided with an elastic rubber coating 10 is provided for polishing the optical surface 2 of optical lenses 3, which has a convex surface on the outer circumference 12 of the rubber coating 10 and is arranged and mounted on an end of the connection element 5 of a U-shaped mounting frame 13 facing away from the polishing machine 4.
  • the polishing wheel 11 is arranged on an axially arranged drive shaft 15 which runs radially to a longitudinal center axis 14 of the spindle 9 of the polishing machine 4 and which is mounted on lateral legs 16 of the U-shaped mounting frame 13, preferably by means of roller bearings 17, the polishing wheel 11 being arranged between the two lateral legs 16 with little play on the drive shaft 15.
  • the device 1 further comprises a crown or bevel gear 18 which serves to drive the polishing wheel 11 by means of the rotating part 8 of the spindle 9 of the polishing machine 4 via the drive shaft 15.
  • the crown or bevel gear 18 is formed on the one hand from a pinion 19 arranged at one end of the drive shaft 15, wherein the drive shaft 15 is arranged on one side of the mounting frame 13 or on one of the two legs 16 of the mounting frame 13 protrudes beyond the same and the pinion gear 19 is mounted on the protruding part 20 of the drive shaft 15.
  • the crown or bevel gear 18 is formed from a crown or bevel gear 23 which is rotatably mounted on a fixed bearing sleeve 21 of the device 1, which runs coaxially to the spindle 9 of the polishing machine 4, preferably via further roller bearings 22.
  • a further toothing 25 is arranged on an outer circumference 24 of the crown or bevel gear 23, with which the polishing wheel 11 can be driven via the drive shaft 15 via a gear 28 driven by a separate drive motor 26, which is arranged with its longitudinal center axis 27 at a distance and parallel to the longitudinal center axis 14 of the spindle 9 of the polishing machine 4.
  • the bearing sleeve 21 has a correspondingly arranged holding device 29.
  • the polishing wheel 11 with its elastic rubber coating is placed on the surface 2 of the lens 3 arranged in a workpiece clamping system 30 of the polishing machine 4, whereupon the spindle 9 of the polishing machine 4 begins to rotate about its longitudinal center axis 14 with the crown or bevel gear 23 blocked and the polishing wheel 11 simultaneously rotating about the longitudinal center axis 14 of the spindle 9 of the polishing machine 4 and the longitudinal center axis 31 of the drive shaft 15.
  • the pinion gear 19 rolls on the blocked crown or bevel gear 23 with a constant transmission ratio.
  • a change in the transmission ratio between the crown or bevel gear 23 and the pinion gear 19 with a simultaneous change in the speed and/or change in the direction of rotation of the polishing wheel 11 is carried out by operating the drive motor 26.
  • the direction of rotation of the drive motor 26 can be switched, whereby the speed of the polishing wheel 11 can also be changed. Furthermore, the speed of the drive motor 26 can be changed.
  • the transmission ratio between the crown or bevel gear 23 and the pinion gear 19 changes as soon as the drive motor 26 is switched on.
  • the speed of the polishing wheel 11 changes accordingly.
  • the drive motor 26 can control the rotational speed and direction of rotation independently of the spindle 9 of the polishing machine 4.
  • Fig. 2 shows an example of a profile of the polishing impression with the spindle 9 of the polishing machine 4 running and the polishing wheel 11 rotating at a standstill, which is compensated by the rotation of the drive motor 26.
  • Fig. 3 shows an example of a profile of the polishing impression with the spindle 9 of the polishing machine 4 running and the polishing wheel 11 rotating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP23176169.3A 2023-05-30 2023-05-30 Dispositif de polissage de surface optique de lentille optique, machine de polissage et procédé de polissage Active EP4470717B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP23176169.3A EP4470717B1 (fr) 2023-05-30 2023-05-30 Dispositif de polissage de surface optique de lentille optique, machine de polissage et procédé de polissage
CN202410673544.8A CN119057619A (zh) 2023-05-30 2024-05-28 用于抛光光学镜片的光学表面的装置、抛光机及抛光方法
US18/678,012 US20240399533A1 (en) 2023-05-30 2024-05-30 Device for polishing an optical surface of optical lenses, polishing machine and method for polishing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23176169.3A EP4470717B1 (fr) 2023-05-30 2023-05-30 Dispositif de polissage de surface optique de lentille optique, machine de polissage et procédé de polissage

Publications (3)

Publication Number Publication Date
EP4470717A1 true EP4470717A1 (fr) 2024-12-04
EP4470717B1 EP4470717B1 (fr) 2025-11-05
EP4470717C0 EP4470717C0 (fr) 2025-11-05

Family

ID=86609711

Family Applications (1)

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EP23176169.3A Active EP4470717B1 (fr) 2023-05-30 2023-05-30 Dispositif de polissage de surface optique de lentille optique, machine de polissage et procédé de polissage

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Country Link
US (1) US20240399533A1 (fr)
EP (1) EP4470717B1 (fr)
CN (1) CN119057619A (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050079812A1 (en) * 2003-05-16 2005-04-14 Bechtold Michael J. Tool, apparatus, and method for precision polishing of lenses and lens molds
EP2837464A1 (fr) 2013-08-13 2015-02-18 Optotech Optikmaschinen GmbH Procédé de polissage destiné au traitement d'une surface optique d'une lentille optique et outils de polissage appropriés
CN112171436A (zh) * 2020-09-17 2021-01-05 恒迈光学精密机械(杭州)有限公司 一种轮式抛光装置及加工方法
CN113458910B (zh) * 2021-07-16 2022-08-19 中国科学院长春光学精密机械与物理研究所 一种抛光头及采用该抛光头的机床设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050079812A1 (en) * 2003-05-16 2005-04-14 Bechtold Michael J. Tool, apparatus, and method for precision polishing of lenses and lens molds
EP2837464A1 (fr) 2013-08-13 2015-02-18 Optotech Optikmaschinen GmbH Procédé de polissage destiné au traitement d'une surface optique d'une lentille optique et outils de polissage appropriés
CN112171436A (zh) * 2020-09-17 2021-01-05 恒迈光学精密机械(杭州)有限公司 一种轮式抛光装置及加工方法
CN113458910B (zh) * 2021-07-16 2022-08-19 中国科学院长春光学精密机械与物理研究所 一种抛光头及采用该抛光头的机床设备

Also Published As

Publication number Publication date
CN119057619A (zh) 2024-12-03
EP4470717B1 (fr) 2025-11-05
US20240399533A1 (en) 2024-12-05
EP4470717C0 (fr) 2025-11-05

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