EP0128779A2 - Dispositif de rectification pour surfaces sphériques - Google Patents

Dispositif de rectification pour surfaces sphériques Download PDF

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Publication number
EP0128779A2
EP0128779A2 EP84303987A EP84303987A EP0128779A2 EP 0128779 A2 EP0128779 A2 EP 0128779A2 EP 84303987 A EP84303987 A EP 84303987A EP 84303987 A EP84303987 A EP 84303987A EP 0128779 A2 EP0128779 A2 EP 0128779A2
Authority
EP
European Patent Office
Prior art keywords
work
grinding
holder
aforementioned
precision
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
EP84303987A
Other languages
German (de)
English (en)
Other versions
EP0128779B1 (fr
EP0128779A3 (en
Inventor
Shuji Ueda
Kunio Nakata
Mamoru Inoue
Kazuhiko Fujino
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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
Priority claimed from JP10513783A external-priority patent/JPS59232758A/ja
Priority claimed from JP15123683A external-priority patent/JPS6044263A/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0128779A2 publication Critical patent/EP0128779A2/fr
Publication of EP0128779A3 publication Critical patent/EP0128779A3/en
Application granted granted Critical
Publication of EP0128779B1 publication Critical patent/EP0128779B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • 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
    • 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
    • B24B11/00—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor

Definitions

  • the present invention relates to a spherical surface grinding device for manufacturing such optical parts as optical lens, mirror, etc., which enable realization of well finished surface at high efficiency.
  • the glass stock is brought to the collet chuck by worker's hand or by an auto loader, to be held thereby, and is taken out by the same means.
  • the diamond grinding stone generally used is METAL BOND of the order of #100 ⁇ #400, which produces a finished surface roughness of 2-6 Rmax.
  • smoothing is performed with diamond METAL BOND pellet and RESINOID BOND pellet and in further later processing, polishing is performed, using such abrasive as Ce0 2 , etc.
  • the lens 3 held by the collet chuck 1 can be ground only by one diamond grinding stone 7.
  • the lens holding posture will be altered and, therefore, larger margin must be taken for precision grinding. Accordingly, rough grinding and precision grinding can not be performed at high efficiency. Since the forced cutting-in method in rough grinding and the constant pressure cutting-in method in precision grinding, respectively, cannot be readily adopted, well finished surface can not be obtained. Thus this device was unable to be put to use for production in the same tact time.
  • the present invention provides in one aspect a spherical surface grinding device having a holder for holding the work, characterised by work shafts on each of which this holder is mounted, to be turned therewith, and each of which feeds it in the axial direction, and grinding tools each arranged at a specified slope angle so as to grind the aforementioned work to the prescribed spherical shape, the aforementioned work shafts and the grinding tools respectively being adapted for rough grinding and for precision grinding, and said device being equipped with a transferring device for bringing the holder holding the aforementioned work to the work shaft for rough grinding and to the work shaft for precision grinding.
  • the invention provides a spherical surface grinding device having a holder capable of holding the work, characterised by a chuck unit for gripping this holder and comprising a transferring device capable of moving between the position for rough grinding of the work and the position for precision grindings, two work shafts each of which receives the holder transferred from the aforementioned chuck unit, is rotatable and moves up and down, one being adapted for rough grinding of the work, and the other for precision grinding, and two grinding tools placed respectively facing the two work shafts, which are in concert capable of grinding the work to the desired spherical shape and each of which is located at a specified angle and position relative to the work surface.
  • the invention provides a spherical surface grinding device having a holder capable of holding the work characterised by a chuck unit for gripping this holder, and comprising a transferring device capable of moving between the position for rough grinding of the work and the position for precision grinding, two work shafts each of which receives the holder transferred from the aforementioned chuck unit and holds it, and which are rotatable and move up and down, one of them being adaptable for rough grinding of the work and the other for precision grinding, and two grinding tools placed respectively facing these two work shafts, which in concert are capable of grinding the work held by the holder to the desired spherical shape, and each of which is located at a specified angle and position relative to the work surface, the work shaft for rough grinding being so arranged as to feed in the work the prescribed distance against the grinding tool, and the work shaft for precision grinding to feed in the work at a prescribed pressure.
  • the device according to the invention is quite advantageous in maintenance and control of precision and reduction of cost.
  • FIG. 2 is a conceptual diagram showing the scheme for transferring the work.
  • the lens 9 on conveyor 8 is transferred in the direction of a by auto-hand 10 and is taken in by a holder 12 supported on a chuck unit 11, to be held thereby.
  • the chuck unit 11 is on index table 13, turned by 120° in the direction of b, to conduct the rough grinding, then, further turned by 120° in the direction of c, to conduct the precision grinding and again turned by 120° in the direction of d to the former position, where the lens 9 is detached from the holder 12, taken out in the direction of e and put on a conveyor 14.
  • the aforementioned operations are continuously run one after another in the same tact time.
  • FIG. 3 presents a particular embodiment, giving a plan view of a spherical surface grinding device and FIG. 4 is its front elevation.
  • 15 denotes a diamond stone for rough grinding, METAL BOND of the order of #100 ⁇ #400.
  • Numeral 16 designates a
  • diamond grinding stone for precision grinding METAL BOND of the order of #800 ⁇ #1500.
  • Numerals 17 and 18 give respective rotary spindles of the aforementioned grinding stones, and 19 and 20 their driving motors.
  • Numerals 21 and 22 designate sliding drive motors for transferring the aforementioned grinding stones to their specified positions. Further, by drive motors, not shown in the figures, the stones are inclined at specified slope angles pivoting around 23 and 24.
  • Numerals 25 and 26 denote rotary spindles on each of which the chuck unit 28 holding the lens 27 to be ground is mounted, and which turn at about 5 n, 50 rpm and 29 and 30 designate their drive motors.
  • the rotary spindle 25, being for rough grinding, is forcibly fed in for a specified distance against the diamond grinding stone 15, realizing the grinding in the forced cutting-in way.
  • the rotary spindle 26, being for precision grinding, is fed in against the diamond grinding stone 16 at a specified constant pressure, realizing the grinding in the constant pressure cutting-in way.
  • Numeral 31 designates an auto-hand for taking the lens stock 27 into this spherical surface grinding device, which performs the operation of getting the work to be held by or taken out of the holder 28, etc.
  • Numeral 32 represents the chuck unit which supports the holder 28 and is mounted on rotary index 33, and 34 stands for the machine base.
  • the auto-hand 31 takes in the lens stock 27 from outside and sets it on the holder 28, to be held thereby.
  • the holder 28, as it is, being held by the chuck unit 32, is turned by 120° in the direction of f by the rotary index 33, to be set in position, and is secured by the rotary spindle 25 upon the chuck unit 32 releasing it.
  • the diamond grinding stone 15 so arranged as to grind the lens stock 27 to the desired radius of curvature is running at as high a speed as 8,000 ⁇ 1,200 rpm. against this stone, the lens stock 27 fixed on the aforementioned rotary spindle 25 is forcibly subjected to a constant dimension cutting-in, while turning at 5 ⁇ 50 rpm, for performing the rough grinding.
  • the holder 28 is released from the rotary spindle 25, again supported by the chuck unit 32 and, then, turned further by 120° in the direction of f, to be set in position. Then the lens stock 27 secured on the rotary spindle 26 similarly as above-described is subjected to a cutting-in at a constant pressure, while turning at 5 ⁇ 50 rpm, for performing the precision grinding. After this grinding, the work is again supported similarly by the chuck unit 32 and again turned by 120° in the direction of f, to be returned to its former position. Thereafter, the lens finished by the precision grinding as above-described is taken out from the spherical surface grinding device by means of the auto-hand 31. A series of operations as above-mentioned are continuously carried out each in the same tact time.
  • Rmax of the order of 0.2 um can be readily achieved after finishing by precision grinding with tact time about 20 ⁇ 50 sec and this process is automatable.
  • the holder holding the work is transferred to the work shaft for rough grinding and to the work shaft for precision grinding and, further, the work shaft for rough grinding is provided with the mechanism for forced cutting-in against the grinding tool, while the work shaft for precision grinding is provided with the mechanism for cutting-in at a specified pressure, respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP19840303987 1983-06-13 1984-06-13 Dispositif de rectification pour surfaces sphériques Expired EP0128779B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP10513783A JPS59232758A (ja) 1983-06-13 1983-06-13 球面加工装置
JP105137/83 1983-06-13
JP151236/83 1983-08-18
JP15123683A JPS6044263A (ja) 1983-08-18 1983-08-18 球面加工装置

Publications (3)

Publication Number Publication Date
EP0128779A2 true EP0128779A2 (fr) 1984-12-19
EP0128779A3 EP0128779A3 (en) 1986-03-05
EP0128779B1 EP0128779B1 (fr) 1990-12-19

Family

ID=26445477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840303987 Expired EP0128779B1 (fr) 1983-06-13 1984-06-13 Dispositif de rectification pour surfaces sphériques

Country Status (2)

Country Link
EP (1) EP0128779B1 (fr)
DE (1) DE3483755D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532892A1 (fr) * 1991-08-16 1993-03-24 Wernicke & Co. GmbH Installation pour le meulage des surfaces optiques et/ou des bords de verres de lunettes
EP0835722A1 (fr) * 1996-10-14 1998-04-15 Nikon Corporation Lentille en plastique et procédé et appareil pour produire cette lentille
EP1375065A1 (fr) * 2002-06-28 2004-01-02 Nidek Co., Ltd. Stockage de lentilles et système d'usinage de verre de lunettes avec ce même dispositif
US9949843B2 (en) 2004-08-09 2018-04-24 Si-Bone Inc. Apparatus, systems, and methods for the fixation or fusion of bone

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1432093A (en) * 1916-10-28 1922-10-17 Taylor William Grinding machine
US2493206A (en) * 1945-06-27 1950-01-03 Perry Lowell & Co Lens grinding and polishing machine
US2643491A (en) * 1950-12-05 1953-06-30 Burroughs Optomat Inc Grinding machine
US3775909A (en) * 1972-01-24 1973-12-04 Corning Glass Works Successive lens polishing apparatus
JPS5871056A (ja) * 1981-11-20 1983-04-27 Nippon Kogaku Kk <Nikon> レンズ研摩装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1432093A (en) * 1916-10-28 1922-10-17 Taylor William Grinding machine
US2493206A (en) * 1945-06-27 1950-01-03 Perry Lowell & Co Lens grinding and polishing machine
US2643491A (en) * 1950-12-05 1953-06-30 Burroughs Optomat Inc Grinding machine
US3775909A (en) * 1972-01-24 1973-12-04 Corning Glass Works Successive lens polishing apparatus
JPS5871056A (ja) * 1981-11-20 1983-04-27 Nippon Kogaku Kk <Nikon> レンズ研摩装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 165 (M-230)[1310], 20th July 1983; & JP-A-58 071 056 (NIHON KOUGAKU KOGYO K.K.) 27-04-1983 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532892A1 (fr) * 1991-08-16 1993-03-24 Wernicke &amp; Co. GmbH Installation pour le meulage des surfaces optiques et/ou des bords de verres de lunettes
US5454194A (en) * 1991-08-16 1995-10-03 Wernicke & Co. Gmbh System for grinding the optical surfaces and/or the edges of eyeglass lenses
EP0835722A1 (fr) * 1996-10-14 1998-04-15 Nikon Corporation Lentille en plastique et procédé et appareil pour produire cette lentille
US6276994B1 (en) 1996-10-14 2001-08-21 Nikon Corporation Plastic lens substrate and apparatus for and method of producing the same
EP1375065A1 (fr) * 2002-06-28 2004-01-02 Nidek Co., Ltd. Stockage de lentilles et système d'usinage de verre de lunettes avec ce même dispositif
US9949843B2 (en) 2004-08-09 2018-04-24 Si-Bone Inc. Apparatus, systems, and methods for the fixation or fusion of bone

Also Published As

Publication number Publication date
EP0128779B1 (fr) 1990-12-19
EP0128779A3 (en) 1986-03-05
DE3483755D1 (de) 1991-01-31

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