EP1963066A1 - Method for calibrating an optical glass drilling machine - Google Patents
Method for calibrating an optical glass drilling machineInfo
- Publication number
- EP1963066A1 EP1963066A1 EP06778799A EP06778799A EP1963066A1 EP 1963066 A1 EP1963066 A1 EP 1963066A1 EP 06778799 A EP06778799 A EP 06778799A EP 06778799 A EP06778799 A EP 06778799A EP 1963066 A1 EP1963066 A1 EP 1963066A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- drilling
- blank
- blind bore
- relative
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
- B28D1/143—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling lens-drilling machines
Definitions
- the present invention relates to a method of calibrating an optical lens piercing machine comprising:
- a toolholder assembly carrying a rotary drilling tool comprising a drilling cutter
- means for controlling the position of the piercing tool with respect to the lens support comprising means for determining the relative position of the tool-holder assembly with respect to the lens support and at least one actuating actuator; relative position of the tool holder assembly relative to the lens holder.
- EP-A-1 310 327 discloses a drilling machine of the aforementioned type.
- a drill bit is wedged into a tool holder assembly to make through holes through an ophthalmic lens.
- the end position of the drill cutter is calibrated according to the position of this cutter in the tool holder, and the nominal length of the milling cutter supplied by the manufacturer. The accuracy on this position is for example of the order of 0.5 mm.
- Such a calibration of the machine is satisfactory for making through holes in ophthalmic lenses.
- the machine is programmed to move the drilling tool relative to the lens on a displacement greater than the sum of the thickness of the lens and the maximum tolerance of length of the cutter.
- this calibration method is not entirely satisfactory for the production of blind holes and / or counterbores in ophthalmic lenses.
- the precision on the position of the end of the drill bit provided by the manufacturer is not sufficient to control the position of the bottom of the blind hole in the lens with sufficient precision.
- An object of the invention is therefore to obtain a calibration method of an optical glass drilling machine of improved precision and reliability.
- the object of the invention is a process of the aforementioned type, characterized in that the method comprises the following steps:
- the method according to the invention may comprise one or more of the following characteristics, taken separately or in any technically possible combination:
- step (c) is carried out by means of at least one position sensor connected to a front feeler intended to be placed facing the first surface, step (c) comprising at least two probing phases of the first surface, at least one probing phase being performed, after drilling the blind bore, in the bottom of the bore; - At least one probing phase of the first surface is performed before drilling the blind bore, at the drilling point of the blind bore;
- the position sensor is further connected to a rear probe, the step (c) comprising for each probing phase of the first surface, the probing of a second surface of the blank located opposite the first surface, to determine a measured thickness of the blank;
- the calibration step comprises the calculation of a real length of the drilling tool, on the basis of the theoretical length of the drilling tool corrected by the difference between the thickness of the blank measured before drilling the hole; the blind bore and the thickness of the blank measured after drilling this blind bore;
- the drilling step comprises forming a blind bore of greater cross section than the cross section of a drill bit of the tool.
- step (a) comprises arranging a planar blank of substantially constant thickness in the lens holder.
- FIG. 1 is a partial schematic elevational view of the relevant parts of a drilling machine for carrying out the method according to the invention
- FIG. 2 is an enlarged view of a marked detail II in Figure 1;
- FIG. 3 is a partial perspective view of a lens blank used in the method according to the invention, in a first step of this method;
- Figure 4 is a view similar to Figure 3 in a second step of this method.
- FIG. 5 is a vertical sectional view along a VV plane of a detail of Figure 4.
- the drilling machine 11 shown in Figure 1 is intended to make holes in ophthalmic lenses, these lenses having been previously roughed by peripheral grinding.
- the machine 11 shown in Figure 1 is adapted to drill blind holes or countersinks in a lens, these blind holes being used to immobilize a mechanical part, for example by pressing a pin.
- a calibration blank 13 is placed in the machine 11.
- the blank 13 is a substantially planar disc having a constant thickness.
- the machine 11 comprises a frame 17, a lens support 19, a tool-holder assembly 21, means 23 for axial and radial relative positioning of the assembly 21 with respect to the support 19, a probe assembly 24 and a control unit. control 25.
- the lens holder 19 comprises a carriage 27 pivotally mounted on the frame 17, provided with two half-shafts 29A, 29B adapted to grip the blank 13, and a motor 31 for driving in slow rotation of the blank 13.
- the carriage 27 is hinged relative to the frame 17, by a rear longitudinal edge 28, about an axis X-X 'of substantially horizontal tilting.
- the two half-shafts 29A, 29B are mounted along the front longitudinal edge 32 of the carriage 27. These half-shafts 29A, 29B extend along a substantially horizontal first axis AA 'parallel to the X-X axis .
- the half-shafts 29A, 29B are provided with respective free ends
- the drive motor 31 of the blank 13 rotates the half-shafts 29A, 29B around the first axis A-A 'by a transmission mechanism (not shown).
- the tool-holder assembly 21 comprises a support 35, a linkage arm 37 projecting from the support 35, a drilling tool 39, a rotation drive motor 41 the tool 39, and means 43 for tilting the tool 39 relative to the support 35.
- the link arm 37 is articulated by a first end 45 on the support 21, about a horizontal pivot axis B-B 'substantially orthogonal to the first axis A-A'.
- the tool 39 is mounted in a guide housing formed at the free end 47 of the connecting arm.
- the tool 39 is rotatably mounted about a second axis CC substantially orthogonal to the link arm 37.
- the tool 39 comprises, from left to right in FIG. 2, a substantially cylindrical drive portion 49 wedged axially against an inner surface 50 of the connecting arm 37, and a piercing cutter 51 integral with a free end 52 of the actuating portion 49.
- the inner surface extends along an axis of the arm 37 perpendicular to the axis C-C.
- the piercing cutter 51 protrudes outwardly from the arm 37 along the axis C-C. It has a free end 53 of drilling.
- the drilling cutter 51 has a theoretical or nominal length Lj of between 12 mm and 40 mm and a diameter of between 0.8 mm and 3.0 mm.
- the arm 37 and consequently the tool 39, is rotatable about the axis BB 'on an angular displacement of at least 30 ° and preferably 180 °, in particular being able to take an upper vertical position in which the second axis CC is substantially parallel to the first axis A-A ', and a plurality of inclination positions in which the second axis CC is inclined relative to the first axis A-A'.
- the tool 39 remains substantially in the vertical plane passing through the first axis A-A ', regardless of its position around the axis B-B'.
- the motor 41 for rotating the tool 39 is fixed on the link arm 37. It is connected to the tool 39 by transmission means 55 arranged in the arm 37.
- the adjustment means 43 of the inclination angle of the tool 39 comprise a motor 61 for actuating a worm 63, and a toothed wheel 65 tangent, mounted integral with the linkage arm 37.
- the screw without end 63 extends in a direction substantially parallel to the first axis A-A '.
- the toothed wheel 65 is fixed on the arm 37 at its end 45. It extends in a vertical plane.
- the means 23 for axial and radial relative positioning of the tool-holder assembly 21 with respect to the lens support 19 comprise means 71 for tilting the carriage 27 around its tilting axis X-X ', and means 73 for translation.
- axial axis of the tool holder assembly 21 along an axis DD ' parallel to the first axis A-A'.
- the tilting means 71 of the carriage 27 and the axial translation means 73 of the tool-holder assembly are respectively connected to an actuator 75A for placing the carriage 27 in relative position with respect to the tool-holder assembly 21 along the an axis perpendicular to the axis A-A ', and an actuator 75B relative positioning of the tool holder assembly 21 relative to the carriage 27 along the axis A-A'.
- These actuators 75A, 75B are constituted, for example, by respective drive-stepper motors of the tilting means 71 and translation means 73.
- the actuators 75A and 75B are controlled by the control unit 25.
- the control unit 25 comprises a computer 77 which determines the relative position of the tool-holder assembly 21 with respect to the carriage 27, with reference to their positions on the frame 17, as a function of the respective control signals transmitted to the actuators 75A. , 75B.
- the calculator 77 also calculates the relative position that must be occupied by the free end 53 of the cutter 51 with respect to the blank 13 during drilling, as a function of the depth of penetration and the type of blind hole or countersink. in the blank 13.
- the control unit 25 controls, on the one hand, the movement of the tool holder assembly 21 along the axis DD 'and, on the other hand, the displacement of the carriage 19 around the X-X 'axis. This last movement is likeable to a pseudo-translation movement along an axis perpendicular to the first axis A-A '.
- the control unit 25 also slaved the axial and radial positioning means 23 to position the cutter 51 of the tool 39 in contact with the blank 13 of the lens 15 and make it penetrate into it.
- the control unit 25 is connected to the actuating motor 61 of the tilting means 43 for controlling the rotation of the worm 63 in a first direction or in the opposite direction to the first direction, so as to adjust the inclination of the second axis CC relative to the first axis A-A '.
- the probe assembly 24 comprises two arms 79A, 79B carried by the frame 17, each arm 79A, 79B being provided with a respective feeler finger 81A, 81B.
- Each arm 79A, 79B is thus movable in translation along a substantially horizontal axis E-E ', between a retracted retracted position in the frame 17 and an active measuring position.
- the fingers 81A, 81B extend substantially parallel to the axis A-A 'facing each other, on either side of the blank 13. So, in the measuring position, the front finger
- the probe assembly 24 further comprises a sensor 85 for measuring the linear position of the feeler fingers 81 A, 81 B along the axis E-E '.
- the sensor 85 is connected to the computer 77.
- the linear positions obtained by the sensor 85 are converted by the computer 77 into a distance between the probe fingers 81 A, 81 B.
- This method comprises a step of placing the blank 13 in the support 19, a step of drilling a blind bore of a desired depth into the front surface 83A of the blank, a step of measuring the actual depth of the blank. the blind bore using the probe assembly 24, which comprises a probing phase before the drilling step and a probing phase after the piercing step.
- the method according to the invention further comprises a step of calibrating the control means 25. Initially, the blank 13 is wedged between the two ends 33A, 33B of the half-shafts 29A, 29B by an adapter suitably positioned on this blank. In this position, the front surface 83A of the blank 13 is substantially perpendicular to the axis A-A '.
- the probe assembly 24 is activated. As illustrated in FIG. 3, the probe arms 79A, 79B are brought from their retracted position to their active measuring position in which the fingers 81A, 81B contact respectively the front surface 83A and the rear surface 83B. of the sketch.
- the measurement taken by the position sensor 85 is transmitted to the computer 77, which determines the thickness E A v of the blank 13, before drilling, at the desired drilling point 87 located on the front surface 83A.
- the inclination adjusting means 43 are activated so that the link arm 37 is arranged perpendicularly to the axis A-A '.
- the axis C-C of the drilling cutter 51 is then substantially parallel to the axis A-A '.
- the computer 77 determines the relative position of the inner surface 50 of the arm 37 relative to the position of the front surface 83A of the blank 13.
- the position of the free end 53 of the drilling cutter is then calculated by the calculator, on the basis of the relative position of the surface 50 and the theoretical length L ⁇ of the drilling tool 39, provided by the manufacturer.
- the control means 25 are then activated to move the free end 53 and bring it substantially in contact with the surface 83A, at the point 87.
- the control unit 25 activates the actuators 75A, 75B to mill a blind bore CC and a desired depth P 0 into the front surface 83A of the blank 13, based on the relative position of the free end 53 of the cutter 51 relative to the blank calculated by the computer 77.
- the cutter 51 is extracted from the bore 91 and the tool assembly 21 is moved away from the blank 13.
- the probe assembly 24 is activated again.
- the probe arms 79A, 79B are brought into their active measuring position, so that the front finger 81A contacts the bottom of the blind bore 91, and the rear finger 81B comes into contact with the rear surface. 83B, opposite the merits.
- the thickness EAP of the blank 13 in the blind bore 91 is thus determined and transmitted to the computer 77.
- the actual length LR of the drilling tool 39 is then introduced into the computer 77, to replace the theoretical length Lj to control the tool 39 during the subsequent drilling of blind holes and counterbores in ophthalmic lenses. Thanks to the invention which has just been described, it is possible to have a simple and accurate method of calibrating a drilling machine 11 of optical glasses, without the use of specific tools that could deteriorate the 51. The calibration is thus achieved without contact of the cutter 51 with an additional calibration tool. This method is used to overcome the manufacturing tolerances of drilling drills 51 used to make blind holes or counterbores in ophthalmic lenses.
- each positioning actuator 75A, 75B which feels at least the 83A front surface of the blank 13, before and after drilling, it is possible to significantly improve the accuracy of the calculation of the position of the drilling cutter 51 on the machine 11.
- the two probing phases are performed after drilling the blind bore 91, by measuring the thickness of the lens in the blind bore 91, and at a point in the vicinity of the bore 91.
- the grinding machine In another variant (not shown), the grinding machine
- the probe assembly 24 comprises a single probe finger 81 A to feel the front surface 83A.
- the actual depth of the blind bore 91 is determined by the difference between the measurement of the linear position of the finger 81A in contact with the piercing point 87, before the piercing, and the linear position measurement of the finger 81A. in contact with the bottom of the bore 91, after drilling.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0507890A FR2888765B1 (en) | 2005-07-25 | 2005-07-25 | CALIBRATION METHOD OF OPTICAL GLASS DRILLING MACHINE |
PCT/FR2006/001623 WO2007012717A1 (en) | 2005-07-25 | 2006-07-06 | Method for calibrating an optical glass drilling machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1963066A1 true EP1963066A1 (en) | 2008-09-03 |
EP1963066B1 EP1963066B1 (en) | 2009-04-08 |
Family
ID=36200600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06778799A Expired - Fee Related EP1963066B1 (en) | 2005-07-25 | 2006-07-06 | Method for calibrating an optical glass drilling machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1963066B1 (en) |
FR (1) | FR2888765B1 (en) |
WO (1) | WO2007012717A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107297524B (en) * | 2017-05-15 | 2018-09-25 | 中车青岛四方机车车辆股份有限公司 | Floor openings device |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITRN990012A1 (en) * | 1999-05-06 | 2000-11-06 | Ct Ottico Foto G I O Snc Di Gi | MACHINE FOR DRILLING OR MILLING LENSES IN GLASSES. |
-
2005
- 2005-07-25 FR FR0507890A patent/FR2888765B1/en active Active
-
2006
- 2006-07-06 WO PCT/FR2006/001623 patent/WO2007012717A1/en active Application Filing
- 2006-07-06 EP EP06778799A patent/EP1963066B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2007012717A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2888765B1 (en) | 2008-10-10 |
EP1963066B1 (en) | 2009-04-08 |
WO2007012717A1 (en) | 2007-02-01 |
FR2888765A1 (en) | 2007-01-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1606079B1 (en) | Machine for grinding optical lenses | |
EP1807244B1 (en) | Device and method for adjusting the drilling direction of a drilling tool for an ophthalmic lens | |
EP0853527B1 (en) | Device for measuring or checking an orbitally mobile cylindrical part during machining thereof | |
EP2976197B1 (en) | Lens drilling process along an helicoidal trajectory and device to carry-out such a process | |
FR2972382A1 (en) | OPTICAL GLASS GRINDING MACHINE AND ASSOCIATED GRINDING METHOD | |
FR2751256A1 (en) | MACHINE FOR GRINDING OPTICAL LENSES | |
EP1689569B1 (en) | Method for piercing optical glasses with the aid of a digitally controlled drill and device for carrying out said method . | |
WO2007060329A1 (en) | Method and device for trimming an ophthalmic lens in order to machine the edge of the lens along a desired curve | |
EP1963066B1 (en) | Method for calibrating an optical glass drilling machine | |
EP1522378B1 (en) | Five axis machine tool with continuous grinding wheel dressing device | |
EP2964423B1 (en) | Device for cutting an ophthalmic lens | |
FR2966072A1 (en) | CALIBRATION JIG FOR A MACHINE FOR MACHINING AN OPHTHALMIC LENS, DEVICE AND METHOD USING SUCH JIG | |
EP1993797B1 (en) | Method for drilling an ophthalmic lens to obtain the desired shape and dimension of a hole to be drilled in said lens | |
EP2214865B1 (en) | Device for correcting the edging of an ophthalmic lens and method for edging an ophthalmic lens | |
FR2884163A1 (en) | OPTICAL GLASS GRINDING MACHINE WITH INCLINED FINISHING WHEEL AND CORRESPONDING OPTICAL GLASS | |
FR2826599A1 (en) | Spectacle lens drilling procedure and apparatus has rotary plate on drill base to move lens about fixed point to make edge notch and hole | |
WO2007060304A2 (en) | Method for calibrating a grinder and corresponding device | |
FR2736571A1 (en) | IMPROVEMENT CONCERNING NUMERICALLY CONTROLLED MACHINE TOOLS | |
BE351864A (en) | ||
BE458977A (en) | ||
FR2876936A1 (en) | Ophthalmic lens piercing machine, has cutter with projecting part having intermediate reinforcement region between active piercing region and tool support, where former region has transversal dimension lower/equal to that of latter region | |
FR2843710A1 (en) | OPHTHALMIC LENS GRINDING DEVICE AND METHOD | |
WO2006053981A1 (en) | Method and machine for scoring the periphery of an ophthalmic lens | |
EP2962658A1 (en) | Digitally controlled machine for, in particular, the production of dental crowns and other dental prostheses | |
FR2689047A1 (en) | Machine tool working on flat workpieces - uses machining head that moves in two or three axes, and longitudinal motion of clamp supporting workpiece. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20080528 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): ES FR IT |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): ES FR IT |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): ES FR IT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090719 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20100111 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090408 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: CJ Effective date: 20120330 Ref country code: FR Ref legal event code: CD Owner name: LUNEAU TECHNOLOGY OPERATIONS, FR Effective date: 20120330 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20130725 Year of fee payment: 8 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20150331 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140731 |