CN100491071C - Lens grinding method and device - Google Patents
Lens grinding method and device Download PDFInfo
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- CN100491071C CN100491071C CNB2005100561721A CN200510056172A CN100491071C CN 100491071 C CN100491071 C CN 100491071C CN B2005100561721 A CNB2005100561721 A CN B2005100561721A CN 200510056172 A CN200510056172 A CN 200510056172A CN 100491071 C CN100491071 C CN 100491071C
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Abstract
In the lens grinding apparatus of the present invention, while the grinding bowl-shaped tool with spherical grinding surface rotates around the rotary central line through the sphere center and the rotary central line performs sphere center swinging to describe one cone with the sphere center as vertex, the lens blank is fed in specified rate in the feeding direction through the sphere center and pushed towards the bowl-shaped tool for grinding, with the cutting speed being altered based on the lens blank feeding speed. The said lens grinding process can cut lens material in high efficiency and grind spherical lens with small curvature in high precision.
Description
Technical field
The present invention relates to optical spherical lens is carried out the lens method for grinding and the lens grinding apparatus of grinding, in more detail, relate to for the bowl-type instrument and can not produce that eccentric wear decreases and can be accurately carry out grinding, and the lens method for grinding and the lens grinding apparatus that can carry out grinding efficiently with the short time to spherical lens.
Background technology
As the method for grinding of optical spherical lens, known have the sphere that utilizes cup emery wheel to make (Japanese: create) method.In the method, as shown in Figure 3, to being that the glass blank 101 of the processing object that is rotated of center will be that the spherical grinding face 104 of the cup emery wheel 103 that is rotated of center carries out butt, grinding is carried out on one side with axis 102 on one side with axis 100, making with the intersection point of axis 100,102 is the sphere 105 of the centre of sphere.This processing method is a sphere method for making completely, but exist curvature that the wearing and tearing because of cup emery wheel 103 cause not normal, the not congruent problem of core cutting to the grinding face of glass blank 101 takes place.
The present patent application people proposed the scheme that the spark instrument is swung revolving lens method for grinding in Japan Patent JP-A 2003-340702 communique.If adopt the lens method for grinding that wherein discloses, just can eliminate the problem that in utilizing the sphere method for making of cup emery wheel, takes place.Especially, in the grinding of the lens face of deep camber, can make the less advantage of deviation of the curvature in the lens face that is obtained in addition.
But in the occasion that the lens face of small curve is carried out grinding, correspondingly the margin of tolerance of curvature is also narrow in the little part of curvature.Therefore, even in the occasion of the said lens method for grinding that uses the present patent application people to propose, the problem that the precision that also exists small eccentric wear because of the bowl-type instrument to decrease to cause lens face reduces.
Again,, using by section is cut off the occasion of the cut-out material that is obtained as the bar-shaped blank of rectangle as the lenticular blank of processing object, with the carrying out of grinding correspondingly cutting output change significantly.That is, when the beginning of machining, shown in Fig. 2 (a), only the two ends of lenticular blank contact with the grinding face of bowl-type instrument, so cutting output is little.Along with the carrying out of cutting, shown in Fig. 2 (b), the two end portions of lenticular blank is cut into dome shape, and the grinding face that becomes with the bowl-type instrument carries out the face state of contact, and cutting output becomes maximum.Yet, in the past, process with identical cutting speed, for this point without any consideration, so for losing process time.
Summary of the invention
The present invention puts in view of the above problems and makes, and its purpose is, lens method for grinding and the lens grinding apparatus that can process accurately the spherical lens face of small curve are provided.
Again, the present invention also aims to, providing can be to cutting off lens method for grinding and the lens grinding apparatus that material carries out machining efficiently, can process accurately the spherical lens face of small curve.
To achieve these goals, lens method for grinding of the present invention, it is characterized in that, it is that the center is rotated with the rotation centerline of the centre of sphere by described sphere that grinding face is become bowl-type instrument that the lens grinding of sphere uses, and this rotation centerline is described with the described centre of sphere is that the state of the taper seat on summit carries out centre of sphere swing, lenticular blank is sent to the direction of feed by the described centre of sphere with the feed speed of regulation, and to the grinding face pushing that is rotated the described bowl-type instrument of swinging with the centre of sphere, to send with the cutting feed speed of regulation to the described lenticular blank after the described bowl-type instrument pushing on one side, on one side this lenticular blank is carried out grinding, described cutting feed speed is changed according to the sendout of described lenticular blank.
In lens method for grinding of the present invention, on one side will have a grinding face the bowl-type instrument being that the state of the taper seat on summit carries out centre of sphere swing and lenticular blank carried out grinding on one side by its rotation centerline being described the centre of sphere with the spherical grinding face.Like this, utilize to make the bowl-type instrument carry out oscillating motion, can process accurately the spherical lens face of small curve.Can the cutting feed speed be changed according to the sendout of lenticular blank again.For example, in occasion, because cutting output is few during the processing beginning to the cut-out material grinding spherical lens face of rectangular section, so send with fast feed speed, after cutting proceeds to a certain degree,, then can process efficiently if to send than its slow feed speed.
Here, can infinitely slow down to described cutting feed speed according to the amount of feeding.Replace, the deceleration of level also can be arranged.Generally, described cutting feed speed, the extremely described amount of feeding are arrived ormal weight be made as the 1st speed, after it, can switch to than the 1st slow-footed the 2nd speed.
This occasion before grinding, is sent described lenticular blank and to detecting with described bowl-type instrument position contacting, can correctly be set the processing starting position.Again, by the switching position of described cutting feed speed being set according to this processing starting position, and will process the starting position to this and add that the position of obtaining behind the allowance sets as the process finishing position, can realize waste and the grinding efficiently of no process time.
For described processing starting position is detected, to carry out feeding to bowl-type instrument fine motion ground to the workpiece feeding platform that described lenticular blank is sent usefulness, confirming that this lenticular blank is with after the bowl-type instrument contacts, the micrometer feed of workpiece feeding platform is stopped, then, workpiece feeding platform is returned to the direction of leaving the bowl-type instrument with Ultra-Low Speed, and lenticular blank is set as the processing starting position from the position of the moment that the bowl-type instrument leaves.
Here, preferably, utilize centre of sphere pendular body, rotate the described bowl-type instrument of state ground supporting freely, with the outer peripheral face of this centre of sphere pendular body as sphere, this outer peripheral face is positioned on the bearing-surface of the centre of sphere as the spherical shape of the centre of sphere with the grinding face of described bowl-type instrument, between outer peripheral face and bearing-surface, supply with compressed air and make described centre of sphere pendular body come-up, keep the come-up state on one side, make described centre of sphere pendular body carry out the centre of sphere to swing.
Like this, when utilizing compressed air to make centre of sphere pendular body come-up, the resistance in the time of reducing its swing significantly again, can also suppress the wearing and tearing of its bearing-surface.Thus, can make centre of sphere pendular body correctly and sleekly carry out centre of sphere swing, therefore, owing to can correctly carry out centre of sphere swing at the bowl-type instrument of this place supporting, so can process accurately to the spherical lens face.
On the other hand, the present invention relates to utilize above-mentioned method for grinding that lenticular blank is carried out the invention of the lens grinding apparatus of grinding, and lens grinding apparatus of the present invention is characterized in that, has:
The bowl-type instrument that the grinding face of spherical shape is arranged;
The bowl-type tool spindle that this bowl-type instrument is supported with rotation centerline rotation state freely around the centre of sphere by described grinding face;
Support the centre of sphere pendular body of described bowl-type tool spindle;
Be the state that is rotated on the taper seat on summit, make described centre of sphere pendular body carry out the swing mechanism of centre of sphere swing usefulness with the described centre of sphere at the rotation centerline of described bowl-type instrument;
Make described bowl-type tool spindle be rotated the bowl-type instrument rotating mechanism of usefulness around described rotation centerline;
The lens retainer that the lenticular blank of processing object is kept;
This lens retainer edge is sent the workpiece feed mechanism of usefulness by the feeding axis of the described centre of sphere;
Make described lens retainer be rotated the workpiece rotating mechanism of usefulness around described feeding axis;
The feed motion that utilizes the described lens retainer that described workpiece feed mechanism produces is carried out the Numerical Control portion of Numerical Control,
Described Numerical Control portion changes the cutting feed speed of the lenticular blank that is kept according to the sendout of this lenticular blank on described lens retainer.
Here, it is characterized in that described Numerical Control portion after described cutting feed speed to described sendout arrived ormal weight and be made as the 1st speed, switches to than the 1st slow-footed the 2nd speed.
Again, lens grinding apparatus of the present invention is characterized in that, has the support plate and the compressed air feed mechanism that described centre of sphere pendular body are supported with swing state freely, and described centre of sphere pendular body has the outer peripheral face of spherical shape,
Described support plate has with the centre of sphere of the grinding face of the described bowl-type instrument circular inner peripheral surface as the spherical shape of the centre of sphere, utilize described compressed air feed mechanism to supply with compressed air between described outer peripheral face and described circular inner peripheral surface, described centre of sphere pendular body is retained the state after the described circular inner peripheral surface come-up of described support plate.
In lens method for grinding of the present invention and lens grinding apparatus, be that the state of the taper seat on summit carries out the centre of sphere swing lenticular blank is carried out grinding while the bowl-type instrument by will having the spherical grinding face is described the centre of sphere with the spherical grinding face with its rotation centerline.Like this, utilize to make the bowl-type instrument carry out oscillating motion, can process accurately the spherical lens face of small curve.
Can the cutting feed speed be changed according to the sendout of lenticular blank again.For example, in occasion to the cut-out material grinding spherical lens face of rectangular section, because cutting output is few during the processing beginning, thus send with fast feed speed, after cutting proceeds to a certain degree, to send than its slow feed speed.Therefore, do not taken place lavishly process time, efficiently the spherical lens face be carried out machining.
And, because the starting position that can correctly grasp machining, so can set the finish time the switching instant and the cutting of cutting feed speed in view of the above.Thus, can also avoid process time waste, can carry out machining to the spherical lens face efficiently.
In addition, the centre of sphere pendular body that rotation is supported freely the bowl-type instrument utilizes compressed air to support with the state of come-up.Thus, the resistance in the time of reducing the swing of centre of sphere pendular body significantly, and can suppress the wearing and tearing of its bearing-surface.Therefore, owing to can make the bowl-type instrument that on centre of sphere pendular body, is supported correctly carry out centre of sphere swing, so also can obtain the effect that to process accurately the spherical lens face thus.
Description of drawings
Fig. 1 is the summary construction diagram of the major part of the expression grinding attachment of using spherical glass lens of the present invention.
Fig. 2 is the key diagram of the grinding action of the expression grinding attachment that utilizes Fig. 1.
Fig. 3 is that expression utilizes sphere in the past to make the key diagram of the grinding of method.
The specific embodiment
Below, describe with reference to the example of accompanying drawing the grinding attachment of using optical spherical lens of the present invention.
Fig. 1 is the summary construction diagram of major part of grinding attachment of the optical spherical lens of this example of expression.Describe with reference to this figure, grinding attachment 1 has: the lens retainer 3 that the lenticular blank W of maintenance processing object uses; And have and carry out the bowl-type instrument 4 of the spherical grinding face 4a of grinding remaining on lenticular blank W on the lens retainer 3.
Lens main shaft 5 is configured in the upper end by the cylindraceous vertical inside that keeps tube 9 of locking with coaxial state, should vertically be kept tube 9 being supported by pair of bearings 10,11 up and down with rotation state freely.Again, lens main shaft 5 utilizes axis of lens rotation motor 12, and constituting with the lens rotation centerline 5A as its vertical center line is the state that the center is driven in rotation.Cylinder 13 is being connected with the vertical upper end of tube 9 that keeps, and this cylinder 13 is fixed on the upper end by the inside of the supporting cylinder 14 of locking.The vertical tube 9 that keeps becomes the state that is pushed with the power of stipulating by cylinder 13 downwards.
Lens main shaft 5 utilizes workpiece feed mechanism 20 to constitute liftable state.Workpiece feed mechanism 20 has horizontal mounting arm 21, is inserted with vertical maintenance tube 9 with coaxial state in the vertical cylinder portion 22 of the front end that is installed on this horizontal mounting arm 21, supporting cylinder 14 be fixed on horizontal mounting arm 21 above.Horizontal mounting arm 21 utilizes the elevating mechanism with feed screw 23, nut 24 and servomotor 25, can carry out lifting along vertical line slideway 26.
Here, in the supporting cylinder 14 that lens main shaft 5 is supported by cylinder 13, the proximity transducer 27 that the vertical upper end 9a that keeps tube 9 that is installed in its inboard is detected usefulness is installed.Usually, this proximity transducer 27 is in disconnection (OFF) state, and when vertical maintenance tube 9 relative supporting cylinders 14 rose, its upper end 9a utilized proximity transducer 27 to detect, and this sensor output is switched to connection (ON).
Then, be configured in the bowl-type instrument 4 of the below of lens retainer 3, the centre of sphere O that is configured to its spherical grinding face 4a is positioned on the extended line of lens rotation centerline 5A of lens retainer 3 sides.Formed main shaft 4b at the back side of this bowl-type instrument 4, this main shaft 4b is being supported by centre of sphere pendular body 31 with rotation state freely.Here, the rotation centerline 4A of bowl-type instrument 4, on centre of sphere O, the lens rotation centerline 5A that vertically extends is with the cross one another form of acute angle theta relatively, and main shaft 4b is being supported by centre of sphere pendular body 31.
Centre of sphere pendular body 31 has: hemispheric cup-like portion 31a; To the outstanding cylindrical portions may 31b of the foreign side of radial direction, in cylindrical portions may 31b, main shaft 4b is installed from the outer peripheral face part at the center, the end of this cup-like portion 31a with coaxial state and with rotation state freely.Again, flange 31c is just extending sidelong from the bottom of cylindrical portions may 31b, is carrying the motor 32 that main shaft drives is used here.
The cup-like portion 31a of centre of sphere pendular body 31 utilizes the state that formed circular inner peripheral surface 33a swings with the energy centre of sphere on support plate 33 being supported.Circular inner peripheral surface 33a is with the sphere of centre of sphere O as the centre of sphere, is positioned in the outer peripheral face 31d on this circular inner peripheral surface 33a, and the cup-like portion 31a of sphere is that the center can be swung with centre of sphere O.In this example, on circular inner peripheral surface 33a, be formed with compressed air and blow out hole or groove 33b, here, become by compressed air supply road 33c and supply with compressed-air actuated state.Therefore, cup-like portion 31a is retained from the state of circular inner peripheral surface 33a come-up.Therefore, can be that swing sleekly at the center with centre of sphere O with centre of sphere pendular body 31.
The lower end of centre of sphere pendular body 31 is being connected with the output shaft of amplitude of fluctuation adjustment unit 35 with motor 36 by linkage connector 34.Centre of sphere pendular body 31 is positioned on the extended line of bowl-type instrument rotation centerline 4A with the tie point 34a of linkage connector 34, and the rotation centerline 36A of motor 36 remains towards the state of centre of sphere O.When operating the adjustment knob 35a of amplitude of fluctuation adjustment unit 35, the interval of the rotation centerline 36A of tie point 34a and motor 36 changes.Therefore, can adjust the amplitude of fluctuation of the oscillating motion of centre of sphere pendular body 31.
Then, motor 36 is being supported by angle of oscillation adjustment unit 37.Angle of oscillation adjustment unit 37 has the arc cam 38 that is configured in the fixed position, and it is the circular shape at center that this cam 38 is made with centre of sphere O.Under the state that can slide along this cam 38, supporting member 39 is installed, motor 36 here is installed.On supporting member 39, fix nut 40, in nut 40, screwing togather feed screw 41.The end of feed screw 41 is being connected with handle 42.
When turning handle 42, supporting member 39 moves along cam 38.That is be that ormal weight is only swung at the center with centre of sphere O, by the bowl-type tool spindle 4b of centre of sphere pendular body 31 supportings.Therefore, utilize angle of oscillation adjustment unit 37, can make angle θ that the vertical relatively lens rotation centerline 5A of the rotation centerline 4A of bowl-type instrument 4 constitutes, be that the angle of oscillation center line changes.
Here, the driving of the each several part control controller 50 that utilizes Numerical Control to use carries out.Input unit 51 is being connected with controller 50 again.By input unit 51, utilize manual operation can carry out the action that lenticular blank is sent, again, can carry out the setting of cutting output etc.
With reference to Fig. 2 the action of the lens grinding apparatus 1 of this structure is described.At first, lenticular blank W absorption is remained on the lens retainer 3.Then, utilize manual operation to drive servomotor 25, and with lenticular blank W to bowl-type instrument 4 fine motions feeding (JOG).When lenticular blank W was contacted with the bowl-type instrument, the decline of lens main shaft 5 stopped.Then, utilize micrometer feed that horizontal mounting arm 21 (workpiece feeding platform) is descended.Its result, lens main shaft 5 rises to the vertical maintenance tube 9 relative horizontal mounting arms 21 of its supporting freely with rotation, and 27 couples of vertical upper end 9a of tube 9 that keep of proximity transducer detect and switch to connection.
After reaching the processing starting position, speed is switched to the 1st cutting speed, carry out grinding Yi Bian under this speed, lenticular blank W is sent on one side.State when Fig. 2 (a) expression grinding begins.
Lenticular blank W only is cut with the 1st cutting output, after arriving the 1st cutting position, promptly after arriving the cutting state shown in Fig. 2 (b), the swing of beginning centre of sphere pendular body 31, with than 1st cutting speed slow process velocity lenticular blank W sent on one side and cut on one side.Its result, lenticular blank W is ground, and shown in Fig. 2 (c), forms spherical lens face Wa.
When confirming to have arrived the process finishing position, after the swing that utilizes centre of sphere pendular body 31 is stopped, making horizontal mounting arm 21 rise to upper end position.Then, stop the rotation of bowl-type instrument 4 and lenticular blank W.
Claims (8)
1, a kind of lens method for grinding is characterized in that,
Has the bowl-type instrument that the lens grinding of concavity spherical grinding face is used, rotation centerline with the centre of sphere by described spherical grinding face is that the center is rotated, and along swinging with the convex sphere that with the described centre of sphere is the described spherical grinding face complementation at center, thereby it is the taper seat on summit that this rotation centerline is described with the described centre of sphere
Lenticular blank is sent to the direction of feed by the described centre of sphere with the feed speed of regulation, and to the grinding face pushing that is rotated the described bowl-type instrument of swinging with the centre of sphere,
To send, this lenticular blank be carried out grinding on one side with the cutting feed speed of regulation to the described lenticular blank after the described bowl-type instrument pushing on one side,
The sendout of described cutting feed speed according to described lenticular blank changed.
2, lens method for grinding as claimed in claim 1 is characterized in that,
With described cutting feed speed when described sendout arrives ormal weight as the 1st speed, switch to after this than the 1st slow-footed the 2nd speed.
3, lens method for grinding as claimed in claim 2 is characterized in that,
Before grinding, described lenticular blank is sent and described lenticular blank and described bowl-type instrument position contacting are detected,
This position is set as the processing starting position,
According to this processing starting position, the switching position of described cutting feed speed is set, and will be processed the starting position to this and add that the position of obtaining behind the allowance sets as the process finishing position.
4, lens method for grinding as claimed in claim 3 is characterized in that,
For the detection of described processing starting position,
The workpiece feeding platform of described lenticular blank being sent usefulness carries out feeding to bowl-type instrument fine motion ground, is confirming that this lenticular blank with after the bowl-type instrument contacts, stops the micrometer feed of workpiece feeding platform,
Then, workpiece feeding platform is returned to the direction of leaving the bowl-type instrument with Ultra-Low Speed, and lenticular blank is set as the processing starting position from the instantaneous position that the bowl-type instrument leaves.
5, as each described lens method for grinding in the claim 1～4, it is characterized in that,
Utilize centre of sphere pendular body that described bowl-type instrument is supported with rotation state freely,
The outer peripheral face of this centre of sphere pendular body is made sphere,
This outer peripheral face is positioned on the bearing-surface of the centre of sphere as the spherical shape of the centre of sphere with the grinding face of described bowl-type instrument,
Between described outer peripheral face and bearing-surface, supply with compressed air and make described centre of sphere pendular body come-up,
While keeping the come-up state, making described centre of sphere pendular body is the sphere swing at center along the centre of sphere with described spherical grinding face.
6, a kind of lens grinding apparatus is characterized in that, has:
Bowl-type instrument with grinding face of spherical shape;
The bowl-type tool spindle, around the rotation centerline of the centre of sphere by described grinding face with rotation this bowl-type instrument of state support freely;
Support the centre of sphere pendular body of described bowl-type tool spindle;
Swing mechanism is rotated on the taper seat that with the described centre of sphere is the summit by the rotation centerline that makes described bowl-type instrument, and makes described centre of sphere pendular body carry out centre of sphere swing;
Make described bowl-type tool spindle be rotated the bowl-type instrument rotating mechanism of usefulness around described rotation centerline;
The lens retainer that lenticular blank is kept;
This lens retainer edge is sent the workpiece feed mechanism of usefulness by the feeding axis of the described centre of sphere;
Make described lens retainer be rotated the workpiece rotating mechanism of usefulness around described feeding axis;
The feed motion that utilizes the described lens retainer that described workpiece feed mechanism produces is carried out the Numerical Control portion of Numerical Control,
Described Numerical Control portion changes the cutting feed speed that remains on the lenticular blank on the described lens retainer according to the sendout of this lenticular blank.
7, lens grinding apparatus as claimed in claim 6 is characterized in that, described Numerical Control portion is made as the 1st speed with described cutting feed speed when described sendout arrives ormal weight, switch to after this than the 1st slow-footed the 2nd speed.
8, as claim 6 or 7 described lens grinding apparatus, it is characterized in that,
Have the support plate and the compressed air feed mechanism that described centre of sphere pendular body are supported with swing state freely,
Described centre of sphere pendular body has the outer peripheral face of spherical shape,
Described support plate has with the centre of sphere of the grinding face of the described bowl-type instrument circular inner peripheral surface as the spherical shape of the centre of sphere,
Utilize described compressed air feed mechanism to supply with compressed air between described outer peripheral face and described circular inner peripheral surface, described centre of sphere pendular body is retained from the state of the described circular inner peripheral surface come-up of described support plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100561721A CN100491071C (en) | 2005-03-23 | 2005-03-23 | Lens grinding method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100561721A CN100491071C (en) | 2005-03-23 | 2005-03-23 | Lens grinding method and device |
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| Publication Number | Publication Date |
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| CN1836838A CN1836838A (en) | 2006-09-27 |
| CN100491071C true CN100491071C (en) | 2009-05-27 |
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| CNB2005100561721A Expired - Fee Related CN100491071C (en) | 2005-03-23 | 2005-03-23 | Lens grinding method and device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5746270B2 (en) | 2013-06-20 | 2015-07-08 | ファナック株式会社 | Numerical control device for machine tools for drilling |
| CN103350383B (en) * | 2013-07-19 | 2015-09-16 | 中国科学院上海光学精密机械研究所 | The burnishing device of axial cone mirror and finishing method |
| WO2015162789A1 (en) * | 2014-04-25 | 2015-10-29 | 株式会社コジマエンジニアリング | Lens-centering method for spherical center-type processing machine, lens-processing method, and spherical center-type processing machine |
| CN105364667B (en) * | 2015-11-19 | 2019-02-12 | 长春博信光电子有限公司 | A kind of hyperboloid high-speed glazing machine |
| CN108838806A (en) * | 2018-07-09 | 2018-11-20 | 河南理工大学 | A kind of lens grinding device |
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