CN102689254A - Grinding processing method of optical glass and manufacturing method of optical glass lens - Google Patents
Grinding processing method of optical glass and manufacturing method of optical glass lens Download PDFInfo
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- CN102689254A CN102689254A CN2012100803701A CN201210080370A CN102689254A CN 102689254 A CN102689254 A CN 102689254A CN 2012100803701 A CN2012100803701 A CN 2012100803701A CN 201210080370 A CN201210080370 A CN 201210080370A CN 102689254 A CN102689254 A CN 102689254A
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Abstract
The invention provides a grinding processing method of optical glass and a manufacturing method of optical glass lens. The grinding processing of glass forming body composed of intractable glass material can be realized at low cost in a condition of not reducing quality. The method is realized through the following procedures. A conductivity cup-shaped grinding material having a grinding surface used for fine grinding is made to abut against the punching body having a to-be-grinded face and the cup-shaped grinding material is driven rotating, thereby realizing fine grinding (S6b). In the grinding procedure, conductive grinding liquid is provided between an electrode arranged opposite to the grinding face of the cup-shaped grinding material and the cup-shaped grinding material. At the same time, a predetermined voltage is exerted between the electrode and the cup-shaped grinding material, thereby reazling the dressing of the grinding face.
Description
Technical field
The present invention relates to the manufacturing approach of the grinding processing method and the optical glass lens of optical glass.
Background technology
(following also the abbreviation, made eyeglass to be used for the optical glass lens of optical device such as camera.) can be through to being made into the glass forming body that glass material (glass material) with desired optical processes and carrying out grinding and then carry out attrition process obtaining by modulated.
Wherein grinding needs the operation in following two stages: after the quality of having carried out machined surfaces such as conduct and roughness is compared the rough processing of manufacturing procedure of preferential emphasis working (machining) efficiency, carry out processing as the fine ginding of the manufacturing procedure of adjustment form accuracy and surface state.Particularly, visualized the grinding method shown in following.
For example, in patent documentation 1, use sphere to create machine (below be called CG) and carry out the rough operation, then carry out equally carrying out the grinding process of eyeglass thus based on the fine ginding operation of CG.
In addition; In patent documentation 2; Following method is disclosed: as the roughing mode of spheric glass and well-known, through the processing of milling/grind of having used the cup-shaped abrasive material sphere is carried out in the rough machined filing, used online electrolysis grinding method (ELID:Electrolytic In-process Dressing), in this online electrolysis grinding method; Use the electric conductivity abrasive material, this abrasive material carried out electrolysis on one side machined object (workpiece) carried out grinding on one side.
In addition, the method for grinding of processing based on CG is disclosed in patent documentation 3.
[patent documentation 1] japanese kokai publication hei 8-132340 communique
[patent documentation 2] TOHKEMY 2000-246613 communique
The practical new case of [patent documentation 3] Japan is logined communique No. 2600063
Optical glass lens can be made through the whole bag of tricks; But; To reduce the reduction that the reduction that causes because of grinding, attrition process shortens process time, realizes cost thus in order trying one's best, to use moulding article mostly with the shape that is similar to the optical glass lens that finally will produce.
The moulding article (glass forming body) of optical glass are by according to the function of the optical glass lens that uses in each optical device and the glass material of suitably selecting (glass material) constitutes.For example have shown in following, be made into the optical glass that glass material with special optical characteristic constitutes by modulated.
In recent years, as the formation material of optical glass lens, use sometimes as optical glass a kind of difficult processed glass material.So-called difficult processed glass material; Being meant on the eyeglass processing technology in eyeglass manufacturing process needs the glass material of certain time down, thereby thereby for example has than the material softer beyond the difficult processed glass material character, the perhaps character that is difficult to process really up to the mark (being unworkability) of damage easily.
But; The glass forming body that is formed by difficult processed glass material is being carried out under the situation of grinding; Because the unworkability of difficult processed glass material can cause damage being deep into surface etc., possibly be difficult to obtain to be suitable for optical glass lens quality by grinding face.
For this damage, also consider after grinding, to remove the milled processed of surface damage.But; In order to remove the damage that is deep into the surface, milled processed needs a lot of time (for example compare with common glass material, need 2～3 times time); And; If do not have masterful technique then can not tackle with appropriate milled processed, under the circumstances, the possibility of result causes the increase for the processing cost of the glass forming body that is formed by difficult processed glass material.
Particularly; The glass forming body that is made up of the difficult processed glass material with unworkability is being carried out under the situation of grinding; For example,, then cause the generation of above-mentioned damage probably if do not carry out extremely modestly utilizing CG processing to wait to make the grinding face of abrasive material with the time by the grinding face butt.
Promptly; The glass forming body that is made up of difficult processed glass material is being carried out under the situation of grinding; Though carried out that those skilled in the art are generally known, the grinding in disclosed two stages in the for example patent documentation 1, promptly utilize CG processing, carrying out with after the quality of machined surface such as roughness is compared the rough processing of preferential emphasis working (machining) efficiency; Carry out the fine ginding processing of adjustment form accuracy and surface state; But in order to ensure by the quality of grinding face, need carry out the milled processed of the above-mentioned that kind that is used to remove damage probably, possibly cause the increase of processing cost.
In addition; In patent documentation 2; To by a kind of BK7 (borosilicate crown as optical glass; The abrasion degree of can standard JOGIS-10 measuring according to the industry of Japanese optical glass is 118) glass forming body that constitutes, use granularity to be #325, #600, these 3 kinds of abrasive materials of #4000, carried out being divided into the multistage grinding of roughing (rough processing) and fine finishining (fine ginding processing).Therefore; In patent documentation 2, the glass forming body that is made up of difficult processed glass material is being carried out under the situation of grinding, also same with patent documentation 1; Though carried out the grinding in two stages; But in order to ensure by the quality of grinding face, need carry out the milled processed of the above-mentioned that kind that is used to remove damage probably, possibly cause the increase of processing cost.
Summary of the invention
Therefore; The present invention visualizes in order to address the above problem; The manufacturing approach of the grinding processing method and the optical glass lens of optical glass is provided: be directed against the glass forming body that constitutes by as difficult processed glass material with glass material of unworkability; Can be under the situation that does not reduce quality (quality by the grinding thing is guaranteed), low cost is carried out grinding (inhibition of processing cost).
The 1st mode of the present invention is a kind of grinding processing method of optical glass; It is characterized in that; This grinding processing method comprises following operation: grinding process; Make the electric conductivity cup-shaped abrasive material of grinding face with fine ginding processing usefulness be connected to before the rough processing of the glass forming body that constitutes by difficult processed glass material as optical glass by grinding face, and this cup-shaped abrasive material is rotated driving, carry out fine ginding thus; And online electrolysis operation; This online electrolysis operation is when carrying out said grinding process; Between electrode that is equipped on the position relative and said cup-shaped abrasive material, the electric conductivity grinding fluid is provided with the grinding face of said cup-shaped abrasive material; Between said electrode and said cup-shaped abrasive material, apply predetermined voltage simultaneously, carry out the dressing of said grinding face thus.
The 2nd mode of the present invention is in the described invention of the 1st mode; It is characterized in that, said difficult processed glass material by fluophosphate glass, phosphoric acid glass, contain the high index of refraction high-dispersion glass of niobium phosphate or contain in the high-refractivity and low-dispersion glass of boric acid lanthanum any one and constitute.
The 3rd mode of the present invention is in the described invention of the 1st or the 3rd mode, it is characterized in that, said cup-shaped abrasive material comprises the abrasive particle and the binding material that combines this abrasive particle that is carried out grinding by grinding face to said, and the granularity of said abrasive particle is #2000～#8000.
The 4th mode of the present invention is in the described invention of the 3rd mode, it is characterized in that, the average grain diameter of said abrasive particle is 1.0 μ m～10.0 μ m.
The 5th mode of the present invention is in the 1st～the 4th mode, in any described invention of mode, to it is characterized in that, the rotating speed of the said cup-shaped abrasive material in the said grinding process is more than the 18000rpm and below the 30000rpm.
The 6th mode of the present invention is in the 1st～the 5th mode in any described invention of mode; It is characterized in that said glass forming body in the said grinding process and said cup-shaped abrasive material are that 1.0 μ m/ are more than second and 15.0 μ m/ below second in the feed speed that the relative position on the butt changeable pressure direction moves.
The 7th mode of the present invention is in the described invention of the 3rd mode, it is characterized in that said binding material is made up of metal adhesive or resinoid bond.
The 8th mode of the present invention is a kind of manufacturing approach of optical glass lens, and this manufacturing approach is used the grinding processing method of any described optical glass of mode in the 1st～the 7th mode, makes optical glass lens based on said glass forming body.
According to the present invention,, can under the situation that does not reduce quality, carry out grinding at low cost to by the glass forming body that constitutes as difficult processed glass material with glass material of unworkability.
Description of drawings
Fig. 1 is the figure that is used to explain the schematic configuration of the optical glass grinding attachment that illustrates as embodiment of the present invention.
Fig. 2 be illustrate general optical glass lens manufacturing step one the example flow chart.
Fig. 3 be illustrate the optical glass lens in the embodiment of the present invention manufacturing step one the example flow chart.
Fig. 4 is the figure that is used to explain based on the mechanism of the electrolysis of ELID filing.
Fig. 5 is the key diagram that the processing conditions among embodiments of the invention 1～embodiment 7 is shown.
Fig. 6 is the key diagram that the processing conditions among embodiments of the invention 8～embodiment 10 is shown.
Fig. 7 is the key diagram that the processing conditions among embodiments of the invention 11～embodiment 12 is shown.
Fig. 8 is the key diagram that the processing conditions among embodiments of the invention 13～embodiment 15 is shown.
Fig. 9 is the key diagram that the processing conditions in comparative example 1～comparative example 2 of the present invention is shown.
Label declaration
1: the optical glass grinding attachment; 2: turntable; 3: the cup-shaped abrasive material; 3a: abrasive particle portion; 4: electrode; 5: the grinding fluid supply unit; 6: voltage application portion; 7: movement controller; 10: the punching press article.
The specific embodiment
Below, use accompanying drawing that mode of the present invention is described.
In this embodiment, the grinding processing method of the optical glass that used the optical glass grinding attachment and the manufacturing approach of optical glass lens are described with following order.
1. be directed against the explanation of difficult processed glass material
2. the structure of optical glass grinding attachment
3. the action of optical glass grinding attachment is routine
4. the effect of this embodiment
< 1. being directed against the explanation of difficult processed glass material >
In this embodiment; The difficult processed glass material by the grinding thing that forms grinding is equivalent to glass material a kind of of optical glass; But different with the glass material (being the kind beyond the difficult processed glass material) of other kinds, difficult processed glass material is the glass material of certain time under needing on the eyeglass processing technology in eyeglass manufacturing process.Therefore, can difficult processed glass material be interpreted as to have at glass that adds the character that is easy to generate damage man-hour or the glass that is difficult to process.
The difficult processed glass material of this character for example can with after the abrasion degree (FA) stated distinguish over the glass material beyond the difficult processed glass material as benchmark.Here, as an example, the situation that use is measured abrasion degree by the standard specimen (glass material beyond the difficult processed glass material, abrasion degree FA=100) of Japanese optical glass industry meeting appointment during to the abrasion degree of after measurement, stating (FA) describes.By difficult processed glass material form by grinding thing (glass forming body) for example with being compared of standard specimen by grinding thing (glass forming body); Thereby have softer easily damage character (fluophosphate glass in the glass of following record, phosphoric acid glass and the high index of refraction high-dispersion glass that contains niobium phosphate) thereby, or the character that is difficult to process really up to the mark (the high-refractivity and low-dispersion glass that contains the boric acid lanthanum in the glass of following record); Be unworkability, therefore need following certain time to deal with its unworkability.In addition, to really up to the mark and under the situation that glass that be difficult to process is processed, need to use coarse grained abrasive (for example #270) usually, can cause bigger damage on the contrary.
In above-mentioned explanation; As the glass material beyond the difficult processed glass material; It with the standard specimen example and the character of glass is illustrated; But be not limited thereto, " the difficult processed glass material " among the present invention be abrasion degree FA be more than 45 and 95 below optical glass or abrasion degree FA be 160 or more and 500 below optical glass, the glass material beyond the difficult processed glass material is meant that abrasion degree FA is above 95 and less than 160 optical glass.The present invention can be applied to the glass of this scope.
As the object lesson of the optical glass that constitutes by this difficult processed glass material, can enumerate fluophosphate glass, phosphoric acid glass, contain niobium phosphate the high index of refraction high-dispersion glass, or contain the high-refractivity and low-dispersion glass of boric acid lanthanum.That is, in this manual, illustrational glass formation material is defined as " difficult processed glass material " here.In this embodiment, will by these fluophosphate glasses, phosphoric acid glass, contain the high index of refraction high-dispersion glass of niobium phosphate or contain glass forming body that any one glass in the high-refractivity and low-dispersion glass of boric acid lanthanum forms as sphere create processing by grinding thing (glass forming body).
Fluophosphate glass is the low-refraction low dispersion, has following structure.Fluophosphate glass is the P that contains as necessary cation constituent
5+, Al
3+With the alkaline-earth metal ion and contain F as necessary anion component
-And O
2-Optical glass, be to have that refractive index (nd) is, Abbe number (vd) is the optical glass of the optical characteristics more than 65 more than 1.45.Especially, preferably contain the P5+ of 3～50 cation %, the Al of 3～40 cation %
3+In addition, the F that preferably contains 20～95 anion %
-, and contain the O of 5～80 anion %
2-, preferred F
-And O
2-Total content be 100 anion %.In addition, as the alkaline-earth metal ion, preferably contain from by Mg
2+, Ca
2+, Sr
2+, Ba
2+Select in the group of forming at least a more than.And from suppressing volatility, the rodent aspect of fluorphosphate glass, expectation makes O
2-Content with respect to P
5+The mol ratio O of content
2-/ P
5+Become more than 3.5.
Particularly, as fluophosphate glass, can enumerate the optical glass of following ratio: in this optical glass, % representes with cation, contains P
5+: 3～50%, Al
3+: 5～40%, Mg
2+: 0～10%, Ca
2+: 0～30%, Sr
2+: 0～30%, Ba
2+: 0～40%, Li
+: 0～30%, Y
3+:: 0～10%, La
3+: 0～10%; % representes with anion, contains F
-: 20～95%, O
2-: 5～80%.In addition, the abrasion degree of fluophosphate glass (FA) is preferably 380～500, and more preferably 400～460.
Phosphoric acid glass is a low dispersion, has following structure.Phosphoric acid glass is such optical glass: as neccessary composition, contain P
2O
5, B
2O
3, Li
2O, MgO, CaO and BaO, and have that refractive index (nd) is 1.50～1.70, Abbe number (vd) is 60～70 optical characteristics.
Particularly, as phosphoric acid glass, can enumerate the optical glass of following ratio: in this optical glass, % representes with quality, contains P
2O
5: 18～70%, B
2O
3: 1～35%, Al
2O
3: 0～8%, Li
2O:0～20% (wherein, having got rid of 0%), Na
2O:0～18%, K
2O:0～15%, MgO:1～25%, CaO:0～18% (wherein, MgO+CaO＞4%), SrO:0～20%, BaO:1～40%, ZnO:0～14%, Gd
2O
3: 0～18%, Sb
2O
3: 0～1%.In addition, the abrasion degree of phosphoric acid glass (FA) is preferably 250～350, and more preferably 270～310.
The high index of refraction high-dispersion glass that contains niobium phosphate is the optical glass that contains at least a easy reduction composition that is made up of W, Ti, Bi and Nb; These be prone to the reduction compositions content add up to 5～60 moles of %, and have that refractive index (nd) is more than 1.80, Abbe number (vd) is the optical characteristics below 30.
Particularly, as the high index of refraction high-dispersion glass that contains niobium phosphate, can enumerate the optical glass of following ratio: in this optical glass, % representes with mole, contains P
2O
5: 10～45%, Nb
2O
5: 3～35%, Li
2O:2～35%, TiO
2: 0～25%, WO
3: 0～20%, Bi
2O
3: 0～40%, B
2O
3: 0～20%, BaO:0～25%, ZnO:0～25%, Na
2O:0～50%, K
2O:0～20%, Al
2O
3: 0～15%, SiO
2: 0～15% (wherein, WO
3, TiO
2, Bi
2O
3And Nb
2O
5Total amount more than or equal to 10% and less than 65%).In addition, the abrasion degree (FA) that contains the high index of refraction high-dispersion glass of niobium phosphate is preferably 150～300, more preferably is made as 160～290.
The high-refractivity and low-dispersion glass that contains the boric acid lanthanum is except containing at least a easy reduction composition that is made up of W, Ti, Bi and Nb, also contains the B as neccessary composition
2O
3, La
2O
3, ZnO optical glass, be have that refractive index (nd) is more than 1.8, optical glass that Abbe number (vd) is 25～50 optical characteristics.In this optical glass, B
2O
3Be the cancellated neccessary composition that is used to realize glass, La
2O
3Be the neccessary composition that is used to give high index of refraction, low dispersion characteristics, because two kinds of composition coexistences, so the stability of glass further improves.
Particularly, as the high-refractivity and low-dispersion glass that contains the boric acid lanthanum, can enumerate the optical glass of following ratio: in this optical glass, % representes with mole, contains SiO
2: 0～50%, B
2O
3: 5～70%, Li
2O:0～20%, Na
2O:0～10%, K
2O:0～10%, ZnO:1～50%, CaO:0～10%, BaO:0～10%, SrO:0～10%, MgO:0～10%, La
2O
3: 5～50%, Gd
2O
3: 0～22%, Yb
2O
3: 0～10%, Nb
2O
5: 0～15%, WO
3: 0～20%, TiO
2: 0～40%, Bi
2O
3: 0～20%, ZrO
2: 0～15%, Ta
2O
5: 0～20%, GeO
2: 0～10%.In addition, the abrasion degree (FA) that contains the high-refractivity and low-dispersion glass of boric acid lanthanum is preferably 45～95, and more preferably 50～80.
As the object lesson of the fluophosphate glass in the optical glass that constitutes by this difficult processed glass material, can enumerate FCD1 (HOYA Corp.'s manufacturing, nd=1.49700, vd=81.61).Illustrational here FCD1 for example has Knoop hardness Hk≤350N/mm
2And the engineering properties of abrasion degree FA>=400.Therefore, with the optical glass that forms by the glass material beyond the difficult processed glass material (Knoop hardness Hk>=500N/mm for example
2, abrasion degree FA≤200) compare, thereby have the softer easy characteristic of damage in man-hour that adds.
In addition, as the concrete example of phosphoric acid glass, can enumerate PCD4 (HOYA Corp.'s manufacturing, nd=1.61800, vd=63.40) and PCD51 (HOYA Corp.'s manufacturing, nd=1.59349, vd=67.00).
In addition; As the concrete example of the high index of refraction high-dispersion glass that contains niobium phosphate, can enumerate E-FDS1 (HOYA Corp.'s manufacturing, nd=1.92286, vd=20.88), FDS18 (HOYA Corp.'s manufacturing, nd=1.94595, vd=17.98) and FDS90 (HOYA Corp.'s manufacturing, nd=1.84666, vd=23.78).
In addition; As the concrete example of the high-refractivity and low-dispersion glass that contains the boric acid lanthanum, can enumerate TAFD25 (HOYA Corp.'s manufacturing, nd=1.90366, vd=31.32), TAFD35 (HOYA Corp.'s manufacturing, nd=1.91082, vd=35.25), TAFD40 (HOYA Corp.'s manufacturing, nd=2.00069, vd=25.46).
In addition, above-mentioned abrasion degree (FA) can be measured by standard JOGIS-10 according to Japanese optical glass industry.Its measuring method is: with measured area is 9cm
2Sample remain in the fixed position place of the center of the cast iron planar disk of changeing at a distance of 80mm with the rotation of per minute flatly 60; Supply with equably in during 5 minutes and in the 10g alumina abrasive grain of average grain diameter 20 μ m, added the lapping liquid that 20ml water forms, and the load that applies 9.807N grinds.Sample mass before and after grinding weighed obtain abrasion quality m.Measured abrasion quality m in the same way by the standard specimen of Japanese optical glass industry meeting appointment
0, and utilize computes to go out abrasion degree (FA).
Abrasion degree (FA)=(m/d)/(m
0/ d
0) * 100 ... (1) formula
Here, d is the proportion of sample, d
0Proportion for standard specimen.
< the 2. structure of optical glass grinding attachment >
Fig. 1 is used to explain the routine sketch map of schematic configuration that the glass forming body that is made up of difficult processed glass material is carried out the optical glass grinding attachment 1 of grinding.
Optical glass grinding attachment 1 shown in Figure 1 is following apparatus structure: the curve of the machine (CG:Curve Generator) that forms based on curved surface that when generally the rough processing through grinding is ground to sphere, uses forms in the processing filing (below be called " CG manufacturing procedure "), has used online electrolysis grinding method based on online electrolysis (ELID:Electrolytic In-process Dressing) (below be called " ELID operation ").In addition, about " CG manufacturing procedure ", " ELID operation ", will specify in the back.
As shown in Figure 1, the optical glass grinding attachment of explaining in this embodiment 1 has turntable 2, cup-shaped abrasive material 3, electrode 4, grinding fluid supply unit 5, voltage application portion 6 and movement controller 7.
This optical glass grinding attachment 1 can be according to the control of movement controller 7; Automatically carry out the dressing (burr) of the grinding face of cup-shaped abrasive material 3 through the ELID in ELID operation circulation, utilize cup-shaped abrasive material 3 that the punching press article 10 of optical glass (difficult processed glass material) system are ground to spherical shape by grinding face through the CG manufacturing procedure simultaneously.
In addition, optical glass grinding attachment 1 shown in Figure 1 is so-called vertical, shows the apparatus structure of in the curved surface formation machine of grinding convex surface, having used online electrolysis grinding method.Optical glass grinding attachment 1 shown in Figure 1 also can be so-called horizontal, can in the curved surface formation machine of grinding concave surface, use online electrolysis grinding method.
Cup-shaped abrasive material 3 forms cup-shaped (having the cylindric of open end), and it is relative with the chuck segment 2a of turntable 2 that the open end is configured to, and near the end face of a side relative with chuck segment 2a, is provided with the 3a of abrasive particle portion as grinding face.
That is, cup-shaped abrasive material 3 constitutes: make the 3a of abrasive particle portion to be connected to be held the punching press article 10 of the glass forming body that is made up of difficult processed glass material on the chuck segment 2a of turntable 2.
The 3a of abrasive particle portion utilizes the bond material (binding material) that is made up of metal materials such as cast iron or bronze that diamond abrasive grain is formed admittedly together.Through using metal material, make cup-shaped abrasive material 3 as metal bonded abrasive performance function with electric conductivity as bond material.But,, also can be resin-bonded abrasive material as long as have electric conductivity.
In addition, cup-shaped abrasive material 3 constitutes by not shown drive sources such as motor and is rotated driving.The rotating shaft of cup-shaped abrasive material 3 is positioned on the line with the angled α of rotating shaft of turntable 2.This angle [alpha] be according to curvature 1 to the 1 ground decision of the spheric glass that will make, after the curvature according to eyeglass has determined angle [alpha], process continuously keeping under the state of this angle [alpha] in principle.In order to tackle multiple lens shape, not shown swing mechanism capable of using changes angle [alpha] in preset range (for example 0 °～60 °).
And cup-shaped abrasive material 3 constitutes: can pass through not shown travel mechanism, along the direction of feed of this cup-shaped abrasive material 3, change the relative position with turntable 2." direction of feed " is meant the direction of the punching press article 10 that can change the glass forming body that is made up of difficult processed glass material and the butt pressure of the 3a of abrasive particle portion.The travel mechanism that is used to change the relative position of direction of feed is made up of known technologies such as motor or feed screws.
In addition, as long as travel mechanism can change the relative position of turntable 2 and cup-shaped abrasive material 3, also cup-shaped abrasive material 3 can not moved but mobile turntable 2.
Electrode 4 is configured to across predetermined gap (for example 0.1～0.3mm, be preferably about 0.2mm) relative with the 3a of abrasive particle portion of cup-shaped abrasive material 3.
Grinding fluid supply unit 5 is between the 3a of abrasive particle portion of cup-shaped abrasive material 3 and electrode 4 and the 3a of abrasive particle portion of cup-shaped abrasive material 3 and between by the punching press article 10 of the glass forming body that is made up of difficult processed glass material of grinding thing, the electric conductivity grinding fluid is provided.
As long as the electric conductivity grinding fluid has the function that reduces the resistance between 3a of abrasive particle portion and the electrode 4.Particularly, as the electric conductivity grinding fluid, the water-soluble grinding fluid that consider to use the ELID grinding of the electrical conductivity that has to a certain degree (for example 1300～1800 μ S/cm, be preferably about 1500～1600 μ S/cm) to use.
Therefore, voltage application portion 6 constitutes and has: produce the ELID power supply 6a of predetermined dc pulse voltage, with the power supply brush 6b of the rotating shaft sliding-contact of cup-shaped abrasive material 3, be connected ELID power supply 6a and brush between the 6b and the electric current supplying wire 6c between ELID power supply 6a and the electrode 4 with supplying power.
The action of the above-mentioned various piece 2～6 of movement controller 7 controls.Through the control of this movement controller 7, as the mask body narration of back, the feed speed that the rotating speed, turntable 2 of setting cup-shaped abrasive material 3 at least and the relative position of cup-shaped abrasive material 3 on direction of feed move.
< the 3. action of optical glass grinding attachment example >
Then, the action example to the optical glass grinding attachment 1 of said structure describes.
To in the manufacturing approach of optical glass lens, use the situation of the optical glass grinding attachment 1 of said structure to take here, and be example.
(summary of the manufacturing approach of optical glass lens)
Optical glass lens can be made through the whole bag of tricks; But; In order to reduce the reduction that the reduction that causes because of grinding, attrition process shortens process time, realizes cost thus as far as possible, use punching press article mostly with the shape that is similar to final lens shape.The punching press article comprise: to the glass blank that is used to form the punching press article carry out thermoplastic and in mould, carry out punching press and the drop stamping again that obtains (Reheat Press is hereinafter to be referred as making " RP ".) article; With fused glass block be provided on the bed die and use mold and bed die carry out punching press and the direct punching press that obtains (Direct Press is hereinafter to be referred as making " DP ".) article.The RP article heat after the refractive index of having measured product once more, softening and punching press, so the accuracy of refractive index is excellent.On the other hand; About the DP article, glass materials such as raw material are carried out fusion, and isolate fused glass block the melten glass after clarifying, homogenizing; After at high temperature making the fused glass block deliquescing; Directly use the compacted under mould and carry out punching press, formed this DP article thus, thereby the DP article are excellent aspect the dimensional accuracy of profile, wall thickness etc.In addition, no matter the punching press article of moulding are RP article or DP article thus, and its surface roughness Rz is below the 2.0 μ m.
(general manufacturing step)
Generally speaking; Optical glass lens is for example made as follows: to RP article or the such punching press article of DP article; Carry out rough manufacturing procedure of carrying out rough and the fine ginding manufacturing procedure of carrying out fine ginding successively; Thus, with glass forming body as lens surface be ground to spherical shape by grinding face, and then carry out this attrition process operation of being ground by grinding face.
Fig. 2 be illustrate general optical glass lens manufacturing step one the example flow chart.
(S1: the adjustment/mixing of raw material)
When the manufacturing of optical glass lens; At first; In order to obtain having the optical glass of desired optical, constitute the above-mentioned constituent of this optical glass with above-mentioned predetermined ratio allotment, obtain as the basis of this optical glass glass material (being difficult processed glass material) (S1).Said here glass material is meant by the powder of formations such as metal oxide that is called raw material (batch) or inorganic oxide and/or to raw material and carries out once cooling off after the thick fusion and the cullet that obtain that situation is meant raw material mostly.
(S2: glass melting/clarification)
Afterwards, the glass material that obtains among the above-mentioned steps S1 put into make its fusion (fusion), clarification (comprising deaeration) in the melting furnace, and the melten glass (being the glass of the state after the raw material fusion) after homogenizing is flowed out from the flow export that glass flows out pipeline.
(S3: the moulding of glass～S5A:RP article)
And for example under the situation of having used the RP article, on mold, along continuous straight runs takes out the melten glass that flows out from pipeline.The melten glass that takes out from mold moves horizontally in continuous annealing furnace, and in stove, anneals.This is in inert gas environments such as nitrogen, to cool off gradually so that the operation of residual deformation etc. not in the cooled glass.Thus, obtained melten glass has been carried out the glass forming body after the moulding (S3).After annealing, with predetermined length from the isolated part of glass forming body be reservation shape E shape bar (tabular vitreum) (S4A).Afterwards; There is such operation: a plurality of sheet glass that will be divided into the for example cubic that is called cutting blade from the isolated E shape of continuous glass forming body bar (tabular vitreum); And carry out cold working (adjusting cubical chamfering and deviation of weight) such as grinding or grinding; Become reservation shape/predetermined through this operation, obtain the glass blank that drop stamping moulding is again used thus.The moulding of drop stamping again that obtains is thus being carried out under the thermoplastic state with glass blank, used mould to carry out punch forming, obtaining RP article (S5A) thus as the blank of lanthanum eyeglass.At this moment, the drop stamping moulding can offer mould (non-isothermal punch forming) after the heating in advance with glass blank again, and, also can after offering mould, add drop stamping (isothermal punch forming) with mould.
(S3: the moulding of glass～S5B:DP article)
On the other hand, for example under the situation of having used the DP article, fused glass block is provided on the bed die that is disposed at turntable, and utilizes mold and bed die the shape (S3, S4B, S5B) of fused glass block punch forming for expectation.At this moment, the temperature of bed die is adjusted to: can not cause providing (cast) thus the fused glass block to the bed die can not carry out stamping forming situation because of contacting with bed die by rapid cooling.The bed die temperature is lower than the temperature of melten glass; Therefore; In the process till being poured into the glass forming body (DP article, eyeglass blank) after carrying out punch forming and from punch-forming mold, taking out (take out) moulding, the heat that seizes glass forming body gradually and had from the contact-making surface of glass and bed die.And; When punch forming; Though also adjusted the temperature of mold, the temperature of the mold generally temperature than melten glass is low, therefore; Mold contact with fused glass block or manufacturing press-molded products during, mold also can seize the heat that fused glass block and glass ware forming article are had.In addition; When from melten glass stream, isolating fused glass block; Can through the glass blocks that will obtain weight and drip naturally; Perhaps, can use be cooled to not can thermal welding pair of shear cutter (shear blade) clip melten glass and cut off, thereby can access fused glass block.In addition; Cutting-off method as melten glass; Can also adopt the following decline process of chopping: the below that makes bed die rise to the flow export of glass outflow pipeline receives melten glass; And after reaching predetermined weight, make bed die to descend than the fireballing speed of flowing down of melten glass, cut off melten glass thus.In the explanation relevant with these DP article; Melten glass is the appellation of the glass of the state after the raw material fusion; Melten glass stream is the melten glass that flows down from pipeline; Fused glass block is that glass forming body is meant the glass object (being the DP article) after the punching press from the glass blocks of melten glass flow point from (drip or cut off).In addition; In above-mentioned explanation; Thereby explained fused glass block has been provided to the example that fused glass block is contacted with bed die; But, also can be employed in and be formed with the suspension mould that is used to make the pore that fused glass block suspends on the bed die, under the state that fused glass block is suspended, carry out punch forming.
(grindings of S6:RP article/DP article)
Through after above step obtains RP article or DP article, RP article or DP article are used to obtain the grinding (S6) of the lens surface of intended shape.For example, carry out grinding through the fine ginding operation (S6b) of carrying out the rough operation (S6a) of rough and carrying out fine ginding successively.Rough operation (S6a) is the quality than grinding faces such as surface roughnesses; The preferential grinding process of paying attention to working (machining) efficiency and carrying out is a grain size number of for example using the expression abrasive grain less than #600, the grinding process more specifically carried out as the cup-shaped abrasive material about #325.On the other hand; Fine ginding operation (S6b) is to be mainly used in adjustment form accuracy and surface state and the grinding process carried out, is for example to use the grain size number of representing abrasive grain to be the grinding process of more than the #600, more specifically carrying out as the cup-shaped abrasive material about #1500～#8000.
(S7: the grinding article are ground)
After the part as lens surface of RP article or DP article being ground to spherical shape, these grinding article are removed the damage of the lens surface after the grinding or further reduced the milled processed (S7) of the surface roughness of lens surface through grinding process (S6, S6a, S6b).Through more than a series of step, produce optical glass lens (spheric glass) that lens surface is processed to spherical shape (S8).
(manufacturing step in this embodiment)
Compare with the general manufacturing step of the optical glass lens of above explanation; In this embodiment; Not to divide two stages to carry out the grinding operation according to rough manufacturing procedure, fine ginding manufacturing procedure; But utilize the optical glass grinding attachment 1 of said structure; The cup-shaped abrasive material 3 as the 3a of abrasive particle portion of grinding face that use has that a plurality of abrasive particles through fine ginding processing usefulness form can only utilize the grinding operation in a stage, carries out rough manufacturing procedure and fine ginding manufacturing procedure simultaneously.
Fig. 3 be illustrate the optical glass lens in this embodiment manufacturing step one the example flow chart.
In manufacturing step shown in Figure 3, different with the situation of above-mentioned general manufacturing step to the grinding (S6) of RP article or DP article.Under the situation of above-mentioned general manufacturing step shown in Figure 2, be to have carried out rough operation (S6a) and fine ginding operation (S6b) interimly.Relative therewith, under the situation of manufacturing step shown in Figure 3, directly carried out fine ginding operation (S6b) without rough operation (S6a).That is, in grinding (S6), omitted rough operation (S6a).This be because; According to the optical glass grinding attachment of explaining in this embodiment 1, as the mask body narration of back, carry out electrolysis based on the ELID filing; Therefore can carry out burr to cup-shaped abrasive material 3 while carrying out CG processing, can carry out grinding efficiently.And; According to the optical glass grinding attachment of explaining in this embodiment 1, of the back, the quality that can realize machined surface is simultaneously guaranteed the inhibition with processing cost; Can be to the glass molding material article before the rough, obtain the processing quality behind the fine ginding with the grinding time of lacking.
(concrete condition of the action example of optical glass grinding attachment)
Then, the action example to optical glass grinding attachment 1 describes.
Optical glass grinding attachment 1 is in above-mentioned operation, to as being carried out grinding by the punching press article (RP article or DP article) 10 of the glass forming body that is made up of difficult processed glass material of grinding thing.
The grinding that optical glass grinding attachment 1 carries out is in above-mentioned CG manufacturing procedure, to have used the ELID operation.Below, this each operation is described successively.
(CG manufacturing procedure)
The CG manufacturing procedure is such operation: the punching press article 10 to the optical glass (glass forming body) that is made up of difficult processed glass material carry out CG processing, and the punching press article 10 of this optical glass are ground to spherical shape by the grinding face position of lens surface (promptly as).
In the CG manufacturing procedure, at first will be as the chuck segment 2a that is remained in turntable 2 by the punching press article 10 of the glass forming body that constitutes by difficult processed glass material of grinding thing.Then; Control indication according to from movement controller 7 makes the swing mechanism action; The rotating shaft of cup-shaped abrasive material 3 is fixed in like upper/lower positions: this position has the corresponding angle [alpha] of curvature with the lens surface of institute grinding, and makes the contact site of 3a of abrasive particle portion and lens surface be on the lens light axis.
In this state, the control indication according to from movement controller 7 is rotated driving with desired speed to turntable 2, and, cup-shaped abrasive material 3 is rotated driving with turntable 2 different desired speeds.
And; Control indication according to from movement controller 7 makes travel mechanism's action; Punching press article 10 butts of the glass forming body that constitutes by difficult processed glass material on the 3a of abrasive particle portion that makes cup-shaped abrasive material 3 and the chuck segment 2a that remains in turntable 2, and change turntable 2 and the relative position of cup-shaped abrasive material 3 on direction of feed with predetermined feed speed.
Through carrying out above action; In the CG manufacturing procedure; The rotation of the revolution of the cup-shaped abrasive material 3 that utilization is realized by the rotation of turntable 2 and this cup-shaped abrasive material 3 of being realized by the rotation of cup-shaped abrasive material 3 is carried out CG to the punching press article 10 of the glass forming body that is made up of difficult processed glass material and is processed.
Promptly; Make the cup-shaped abrasive material 3 be driven in rotation be the 3a of abrasive particle portion by grinding face with the punching press article 10 of the glass forming body that constitutes by difficult processed glass material in as the lens surface of glass forming body by the grinding face butt, should be ground to spherical shape by grinding face thus.
(ELID operation)
The ELID operation is in the execution of CG manufacturing procedure, the operation that cup-shaped abrasive material 3 is carried out based on the electrolysis of ELID filing.
Therefore; In the ELID operation; At least till the punching press article 10 that begin to be connected to the optical glass that is made up of difficult processed glass material from cup-shaped abrasive material 3 finish to the grinding of this cup-shaped abrasive material 3 during, 7 pairs of grinding fluid supply units of movement controller 5 provide following control indication with voltage application portion 6.
Promptly; Grinding fluid supply unit 5 is according to the control indication from movement controller 7, between the 3a of abrasive particle portion of cup-shaped abrasive material 3 and electrode 4 and the 3a of abrasive particle portion of cup-shaped abrasive material 3 and between by the punching press article 10 of the glass forming body that is made up of difficult processed glass material of grinding thing, the electric conductivity grinding fluid is provided.
In addition, voltage application portion 6 makes ELID power supply 6a produce predetermined dc pulse voltage according to the control indication from movement controller 7.
Through carrying out above action; In the ELID operation; By the electric current supplying wire 6c and power supply brush 6b of voltage application portion 6, to applying dc pulse voltage between cup-shaped abrasive material 3 and the electrode 4, the grinding face to cup-shaped abrasive material 3 is that the 3a of abrasive particle portion carries out burr (electrolysis) automatically thus.
That is, in the execution of CG manufacturing procedure, between cup-shaped abrasive material 3 and electrode 4, the electric conductivity grinding fluid is provided, applies voltage simultaneously, cup-shaped abrasive material 3 is carried out electrolysis.
Fig. 4 is the key diagram that illustrates based on the mechanism of the electrolysis of ELID filing.
In the ELID filing, at first, the bond material 3b of the 3a of abrasive particle portion is carried out electrolysis through applying voltage, obtain outstanding (with reference to Fig. 4 (a)) of the diamond abrasive grain 3c of appropriateness.Therebetween, being insulated of a part of the bond material 3b that electrolysis is liquated out is deposited in the abrasive material end face and forms insulator coverlay 3d, so Faradaic current reduces automatically.At this moment, initial dressing is accomplished (with reference to Fig. 4 (b)).
When reality is carried out grinding under this state; The insulator coverlay 3d of abrasive material end face with contacted by the surface of grinding thing (the punching press article 10 of the optical glass that promptly constitutes by difficult processed glass material by grinding face); Thereby because of removal is stripped from friction; And meanwhile, diamond abrasive grain 3c begins the abrasion (with reference to Fig. 4 (c)) that grinding is produced abrasive particle by the grinding thing.
So the insulating properties of abrasive material end face reduces, Faradaic current recovers.Thus, electrolysis liquate (with reference to Fig. 4 (d)) is restarted at the position of insulator coverlay 3d attenuation between the diamond abrasive grain 3c after the abrasion, obtains outstanding (with reference to Fig. 4 (b)) of diamond abrasive grain 3c again.
(processing conditions in this embodiment)
Processing conditions when then, optical glass grinding attachment 1 being carried out above-mentioned CG manufacturing procedure and ELID operation describes.
Punching press article 10 conducts of the glass forming body that optical glass grinding attachment 1 will be made up of the difficult processed glass material that is difficult to realize only to carry out without rough processing fine ginding processing are by the grinding thing.Therefore, as explaining, under the processing conditions in the past of having supposed the glass forming body that is made up of the glass material beyond the difficult processed glass material, the quality that is difficult to realize simultaneously machined surface is guaranteed the inhibition with processing cost.
Therefore, the processing conditions of optical glass grinding attachment 1 to be described below carried out processing to the punching press article 10 of the glass forming body that is made up of difficult processed glass material, is above-mentioned CG manufacturing procedure and ELID operation.This processing conditions is realized based on the understanding that the design that does not belong to technological general knowledge in the past obtains according to the present inventor.
Processing conditions to the punching press article 10 of the glass forming body that is made up of difficult processed glass material is: in the CG manufacturing procedure; Compare with the situation of the grinding in fine ginding these two stages of processing with carrying out rough processing, the rotating speed and the turntable 2 of cup-shaped abrasive material 3 are set De Genggao with the feed speed that the relative position of cup-shaped abrasive material 3 on direction of feed moves.These processing conditions offer rotary driving source and the travel mechanism etc. of cup-shaped abrasive material 3 as the control indication from movement controller 7.
Particularly; Rotating speed to cup-shaped abrasive material 3; Be set at such condition: rotating speed is that following (for example with reference to patent documentation 3) this condition of 10000rpm (rotation per minute) is compared when carrying out the rough processing and the grinding in fine ginding these two stages of processing, and making the rotating speed of cup-shaped abrasive material 3 become the high rotating speed higher than its rotating speed is more than the 18000rpm.The higher limit of rotating speed needs only in the permissible revolution of the swivel bearing portion of cup-shaped abrasive material 3 (promptly in the scope of the rating of machine of device).But disconnected film takes place in the electric conductivity grinding fluid that provides during for fear of execution ELID operation, also considers for example to be made as the upper limit about 40000rmp.That is, be made as the rotating speed of cup-shaped abrasive material 3 more than the 18000rpm and below the 40000rpm, preferably be made as about 20000rpm～30000rpm.
In addition, the feed speed about the relative position of turntable 2 and cup-shaped abrasive material 3 moves is set at such condition: as long as be that 1.0 μ m/sec are above and below the 15.0 μ m, be preferably more than the 2.0 μ m/sec and below the 15.0 μ m/sec.
About other processing conditions, can be identical with the situation of the glass forming body that is made up of the glass material beyond the difficult processed glass material being carried out grinding.For example, for the rotating speed of turntable 2,, be preferably set to the condition about 50rpm as long as satisfy the condition of 1～100rpm.In addition, for example,, be preferably set to the condition about 150V as long as satisfy the condition of 30～150V about the voltage that applies of voltage application portion 6.
In addition, in this embodiment, adopted the processing conditions of above explanation, and in the execution of CG manufacturing procedure, carried out the ELID operation, the 3a of abrasive particle portion of cup-shaped abrasive material 3 has been carried out burr (electrolysis) automatically.
Therefore; In this embodiment; Abrasive particle diameter about the 3a of abrasive particle portion of cup-shaped abrasive material 3 does not use the method that changes from coarse to fine interimly, and (for example the grain size number of abrasive particle gets final product as #1500～#8000 but just use the abrasive particle diameter of fine ginding processing usefulness from the outset; Preferred when using granularity to represent as about #2000; Average grain diameter is 1 μ m～5 μ m) carry out grinding, promptly in grinding (S6), can realize such mode: directly carry out fine ginding operation (S6b) without rough operation (S6a).
Promptly; Not to utilize rough operation and fine ginding operation to divide two stages to being carried out grinding by grinding face before the rough processing, have that to process grinding face that a plurality of abrasive particles of usefulness form by fine ginding be that the cup-shaped abrasive material 3 of the 3a of abrasive particle portion carries out grinding but just use from the outset.
Thus, if used the cup-shaped abrasive material 3 of the 3a of abrasive particle portion with fine ginding processing usefulness, and use the ELID operation in the lump; Then can carry out burr all the time, therefore, even carry out under the situation of grinding at punching press article 10 to the glass forming body that constitutes by difficult processed glass material; For by grinding face, can not occur increasing the situation such, that dark damage takes place process time yet, carry out grinding thus; Its result is very desirable aspect guaranteeing in the quality that realizes machined surface.
< the 4. effect of this embodiment >
The grinding processing method of the optical glass of carrying out according to the optical glass grinding attachment of explaining in this embodiment 1, this optical glass grinding attachment 1 and the manufacturing approach of using the optical glass lens that the grinding processing method of this optical glass carries out can access the effect that is described below.
According to this embodiment; Punching press article 10 to the glass forming body that is made up of difficult processed glass material carry out under the situation of grinding; In the execution of CG manufacturing procedure, carry out the ELID operation; And carry out this CG manufacturing procedure: compare with the situation that fine ginding is processed the grinding in these two stages with carrying out rough processing, the rotating speed and the feed speed both sides of cup-shaped abrasive material 3 are set De Genggao with following processing conditions.
Therefore; Even at the punching press article of the glass forming body that will constitute 10 by difficult processed glass material as under by the situation of grinding thing; The quality that also can realize machined surface is simultaneously guaranteed the inhibition with processing cost, and this supposes in the prior art under the processing conditions of situation of the grinding of carrying out two stages and is difficult to realize.
Promptly; Even be under the situation of cup-shaped abrasive material 3 execution grindings of the 3a of abrasive particle portion at the grinding face that forms with a plurality of abrasive particles that have by fine ginding processing usefulness; For before the rough processing by grinding face; Can not occur increasing the situation such, that dark damage takes place process time yet, carry out grinding thus, can obtain being suitable for the machined surface of the quality of glass lens reliably.
, be suitable for the quality of glass lens here, be meant after grinding and under the state before the milled processed, be below the 1 μ m for example by the surface roughness Rz of grinding face.This be because, if surface roughness Rz is below the 1 μ m, then can be accurately and the short time ground milled processed of carrying out after carrying out efficiently.In addition; Owing to can suppress the damage of lens surface, therefore, milled processed does not need more time and skilled technical ability etc.; And; Can also utilize the high speed of feed speed etc. to realize rapidization (shortening process time) of CG manufacturing procedure, therefore, consequently can suppress increase for the processing cost of the glass forming body that forms by difficult processed glass material.
These effects are to infer according to the reason of following narration.
In this embodiment, in the execution of CG manufacturing procedure, carry out the ELID operation.Therefore, the effect of the burr (electrolysis) through the ELID operation, the 3a of abrasive particle portion of cup-shaped abrasive material 3 can fully keep diamond abrasive grain from the outstanding state of bond material, that is, make so-called sword sting out.
And cup-shaped abrasive material 3 is to be rotated driving than the higher speed of situation of carrying out the rough processing and the grinding in fine ginding these two stages of processing.Therefore; If from being observed of the punching press article 10 of the optical glass that constitutes by difficult processed glass material by the grinding face position of lens surface (promptly as); Compare with the situation of common processing conditions, the diamond abrasive grain that is in the state that sword stings out because of the effect of ELID in time per unit by scouring more.
Thus, there is not the good cutting state that cuts residue in being become by grinding face of the punching press article 10 of glass forming body.In addition, owing to can not produce the cutting residue, therefore, can also reduce the resistance when utilizing cup-shaped abrasive material 3 to carry out grinding.Complement each other therewith; Promptly through making cup-shaped abrasive material 3 rotation at a high speed while carrying out the ELID operation; Make the glass forming body that constitutes by difficult processed glass material punching press article 10 become by grinding face the quality that is suitable for eyeglass by grinding face, and can not occur increasing process time such, the situation damaged deeply takes place.
And, in this embodiment, compare with the situation of the grinding in fine ginding these two stages of processing with carrying out rough processing, the feed speed that turntable 2 and the relative position of cup-shaped abrasive material 3 on direction of feed move is set De Genggao.
That is, the amount of feeding that moves of the relative position of time per unit is bigger than the situation of common grinding.Generally speaking, if the amount of feeding is big, then damage gets into by grinding face easily.But, in this embodiment, cup-shaped abrasive material 3 is carried out rotation at a high speed drives.Therefore, can increase the amount of feeding that relative position moves, even and under the situation that has increased the amount of feeding, also can suppress damage and get into by grinding face.
Thus,, can shorten the required time of grinding, follow, can also improve efficient the grinding of the punching press article 10 of the optical glass that constitutes by difficult processed glass material in this if increase the amount of feeding that the relative position of time per unit moves.Therefore, can suppress increase for the processing cost of the punching press article 10 of the glass forming body that constitutes by difficult processed glass material.
In addition, in this embodiment, compare with the situation that fine ginding is processed the grinding in these two stages, the rotating speed and the feed speed both sides of cup-shaped abrasive material 3 are set De Genggao with carrying out rough processing.Therefore, can realize simultaneously reliably being guaranteed the inhibition with processing cost by the quality of grinding face.
For example, if only make the feed speed high speed, and do not make the rotating speed high speed, to make that damage gets into very high by the possibility of grinding face because of the effect of feeding, can not say so this moment and realize simultaneously being guaranteed the inhibition with processing cost by the quality of grinding face.That is,, can realize simultaneously being guaranteed the inhibition with processing cost by the quality of grinding face through rotating speed and feed speed both sides' high speed.
On the other hand, if only make the rotating speed high speed, then can realize being guaranteed by the quality of grinding face.But,, preferably make the feed speed high speed realize that the efficient of grinding improves in order to realize being guaranteed to suppress simultaneously with processing cost by the quality of grinding face.
In addition, this embodiment only shows a preferred implementation of the present invention.That is, the invention is not restricted to the content of this embodiment, can in the scope that does not break away from its purport, suitably change.
[embodiment]
Then, enumerate embodiment, the present invention is specified.But the present invention obviously is not limited to following embodiment.
Fig. 5～Fig. 8 is the key diagram that the processing conditions among embodiments of the invention 1～embodiment 15 is shown.In addition, Fig. 9 is the key diagram that the processing conditions in comparative example 1～comparative example 2 of the present invention is shown.
< embodiment 1 >
In embodiment 1; Punching press article to being formed by the FCD1 (HOYA Corp.'s manufacturing, nd=1.49700, vd=81.61) as difficult processed glass material carry out grinding, thereby produce the optical glass lens (spheric glass) of optic diameter 35.8mm, surface curvature radius 44.72mm.In with a rough operation and a fine ginding operation grinding process after reunification, carried out grinding through in the execution of CG manufacturing procedure, carrying out the ELID operation.Use the cup-shaped abrasive material 3 of a cup diameter 40mm, abrasive grain # 2000, under the state of rotating shaft tilt alpha=14 that make cup-shaped abrasive material 3 °, carried out the CG manufacturing procedure with the processing conditions that is described below.That is the rotating speed of, establishing cup-shaped abrasive material 3 is that 20000rpm, feed speed are 2 μ m/sec.In addition, the rotating speed of establishing turntable 2 is that the voltage that applies of 50rpm, voltage application portion 6 is 150V.In addition, as the electric conductivity grinding fluid that grinding fluid supply unit 5 is provided, used シ ミ ロ Application CG-7 (manufacturing of Datong District's chemical industry Co., Ltd.).
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.18 μ m.Be 50 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 2 >
In embodiment 2, the rotating speed of cup-shaped abrasive material 3 is different with the situation of the foregoing description 1 with feed speed.In embodiment 2, the rotating speed of establishing cup-shaped abrasive material 3 is that 30000rpm, feed speed are 5 μ m/sec.Other conditions are identical with the situation of embodiment 1.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.20 μ m.Be 25 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 3 >
In embodiment 3, the feed speed of cup-shaped abrasive material 3 is different with the situation of the foregoing description 1.In embodiment 3, the feed speed of establishing cup-shaped abrasive material 3 is 1 μ m/sec.Other conditions are identical with the situation of embodiment 1.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.60 μ m.Be 90 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 4 >
In embodiment 4, the feed speed of cup-shaped abrasive material 3 and abrasive grain are number different with the situation of the foregoing description 1.In embodiment 4, the feed speed of establishing cup-shaped abrasive material 3 is to be #1500 10 μ m/sec, abrasive grain numbers.Other conditions are identical with the situation of embodiment 1.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.22 μ m.Be 20 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 5 >
In embodiment 5, the feed speed of cup-shaped abrasive material 3 is different with the situation of the foregoing description 4.In embodiment 5, the feed speed of establishing cup-shaped abrasive material 3 is 15 μ m/sec.Other conditions are identical with the situation of embodiment 4.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.27 μ m.Be 20 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 6 >
In embodiment 6, the feed speed of cup-shaped abrasive material 3 is different with the situation of the foregoing description 4 with the material of binding material.In embodiment 6, the feed speed of cup-shaped abrasive material 3 is made as 2 μ m/sec, the material of binding material is not metal adhesive but resinoid bond.Other conditions are identical with the situation of embodiment 4.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.16 μ m.Be 50 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 7 >
In embodiment 7, the rotating speed of cup-shaped abrasive material 3 is different with the situation of the foregoing description 3.In embodiment 7, the rotating speed of establishing cup-shaped abrasive material 3 is 18000rpm.Other conditions are identical with the situation of embodiment 3.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.87 μ m.Be 90 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 8 >
In embodiment 8, the feed speed of the kind of difficult processed glass material and cup-shaped abrasive material 3 is different with the situation of the foregoing description 4.In embodiment 8, the feed speed of establishing the grinding object and be E-FDS1 (HOYA Corp.'s manufacturing, nd=1.92286, vd=20.88), cup-shaped abrasive material 3 is 5 μ m/sec.Other conditions are identical with the situation of embodiment 4.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.08 μ m.Be 25 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 9 >
In embodiment 9, the kind of difficult processed glass material is different with the situation of the foregoing description 8.In embodiment 9, establishing the grinding object is FDS18 (HOYA Corp.'s manufacturing, nd=1.94595, vd=17.98).Other conditions are identical with the situation of embodiment 8.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.05 μ m.Be 25 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 10 >
In embodiment 10, the kind of difficult processed glass material is different with the situation of the foregoing description 8.In embodiment 10, establishing the grinding object is FDS90 (HOYA Corp.'s manufacturing, nd=1.84666, vd=23.78).Other conditions are identical with the situation of embodiment 8.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.50 μ m.Be 25 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 11 >
In embodiment 11, the feed speed of the kind of difficult processed glass material and cup-shaped abrasive material 3 is different with the situation of the foregoing description 8.In embodiment 11, the feed speed of establishing the grinding object and be PCD4 (HOYA Corp.'s manufacturing, nd=1.61800, vd=63.40), cup-shaped abrasive material 3 is 4 μ m/sec.Other conditions are identical with the situation of embodiment 8.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.56 μ m.Be 30 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 12 >
In embodiment 12, the feed speed of cup-shaped abrasive material 3 and abrasive grain are number different with the situation of the foregoing description 11.In embodiment 12, the feed speed of establishing cup-shaped abrasive material 3 is to be #2000 3 μ m/sec, abrasive grain numbers.Other conditions are identical with the situation of embodiment 11.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.30 μ m.Be 40 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 13 >
In embodiment 13, the feed speed of the kind of difficult processed glass material and cup-shaped abrasive material 3 is different with the situation of the foregoing description 8.In embodiment 13, the feed speed of establishing the grinding object and be TAFD25 (HOYA Corp.'s manufacturing, nd=1.90366, vd=31.32), cup-shaped abrasive material 3 is 8 μ m/sec.Other conditions are identical with the situation of embodiment 8.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.40 μ m.Be 20 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 14 >
In embodiment 14, the kind of difficult processed glass material is different with the situation of the foregoing description 13.In embodiment 14, establishing the grinding object is TAFD35 (HOYA Corp.'s manufacturing, nd=1.91082, vd=35.25).Other conditions are identical with the situation of embodiment 13.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.19 μ m.Be 20 seconds the process time when in addition, cutting output being made as 80 μ m.
< embodiment 15 >
In embodiment 15, the kind of difficult processed glass material is different with the situation of the foregoing description 13.In embodiment 15, establishing the grinding object is TAFD40 (HOYA Corp.'s manufacturing, nd=2.00069, vd=25.46).Other conditions are identical with the situation of embodiment 13.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the processing is 0.49 μ m.Be 20 seconds the process time when in addition, cutting output being made as 80 μ m.
< comparative example 1 >
In comparative example 1, different with the situation of the foregoing description 1～15, carried out the rough processing and the grinding in fine ginding these two stages of processing.In rough processing, the feed speed of establishing cup-shaped abrasive material 3 is to be #325 20 μ m/sec, abrasive grain numbers.On the other hand, in fine ginding processing, the feed speed of establishing cup-shaped abrasive material 3 is to be #1500 10 μ m/sec, abrasive grain numbers.The rotating speed of cup-shaped abrasive material 3 all is made as 6000rpm in any side of rough processing and fine ginding processing.In addition, the rotating speed of establishing turntable 2 is that the voltage that applies of 50rpm, voltage application portion 6 is 0V (promptly not carrying out the ELID operation).In addition, as the electric conductivity grinding fluid, used シ ミ ロ Application CG-7 (manufacturing of Datong District's chemical industry Co., Ltd.).
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the rough processing is 15.0 μ m.Be 15 seconds the process time of the rough processing when cutting output is made as 80 μ m.In addition, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the fine ginding processing is 1.0 μ m.Be 18 seconds the process time of the rough processing when cutting output is made as 80 μ m.
< comparative example 2 >
In comparative example 2, the rotating speed of cup-shaped abrasive material 3 is different with the situation of above-mentioned comparative example 1.In comparative example 2, the rotating speed of establishing cup-shaped abrasive material 3 is 15000rpm.Other conditions are identical with the situation of comparative example 1.
The result who has carried out grinding according to above processing conditions is, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the rough processing is 13.5 μ m.Be 15 seconds the process time of the rough processing when cutting output is made as 80 μ m.In addition, the surface roughness Rz of the lens surface of the eyeglass that is formed by difficult processed glass material after the fine ginding processing is 1.0～2.0 μ m.Why having produced the such deviation of 1.0～2.0 μ m, is because the roughness deviation that exists the burr state because of cup-shaped abrasive material 3 to cause.Be 18 seconds the process time of the rough processing when cutting output is made as 80 μ m.
< summary >
The result who investigates above listed examples 1～15 and comparative example 1～2 can know; To before the processing of the rough of the glass forming body that constitutes by difficult processed glass material by grinding face; Directly carrying out under the situation of fine ginding operation (S6b) without rough operation (S6a); In order to become at the surface roughness Rz that makes machined surface after the grinding below the 1 μ m; About processing conditions to the glass forming body that forms by difficult processed glass material, if establish the rotating speed of cup-shaped abrasive material 3 be 18000rpm～30000rpm, feed speed be 1.0 μ m/sec above and below the 15.0 μ m/sec, the grain size number of abrasive particle be the average grain diameter of #2000～#8000, abrasive particle be 1.0 μ m～10.0 μ m, apply voltage be 30V～150V, binding material be in metal adhesive or the resinoid bond any one, the rotating speed of turntable is 1rpm～100rpm.
Claims (8)
1. the grinding processing method of an optical glass is characterized in that, this grinding processing method comprises following operation:
Grinding process; Make the electric conductivity cup-shaped abrasive material of grinding face with fine ginding processing usefulness be connected to before the rough processing of the glass forming body that constitutes by difficult processed glass material as optical glass by grinding face; And this cup-shaped abrasive material is rotated driving, carry out fine ginding thus; And
Online electrolysis operation; This online electrolysis operation is when carrying out said grinding process; Between electrode that is equipped on the position relative and said cup-shaped abrasive material, the electric conductivity grinding fluid is provided with the grinding face of said cup-shaped abrasive material; Between said electrode and said cup-shaped abrasive material, apply predetermined voltage simultaneously, carry out the dressing of said grinding face thus.
2. the grinding processing method of optical glass according to claim 1 is characterized in that,
Said difficult processed glass material by fluophosphate glass, phosphoric acid glass, contain niobium phosphate the high index of refraction high-dispersion glass, or contain in the high-refractivity and low-dispersion glass of boric acid lanthanum any one and constitute.
3. the grinding processing method of optical glass according to claim 1 and 2 is characterized in that,
Said cup-shaped abrasive material comprises and is carried out the abrasive particle of grinding and the binding material that this abrasive particle is combined to said by grinding face,
The granularity of said abrasive particle is #2000～#8000.
4. the grinding processing method of optical glass according to claim 3 is characterized in that,
The average grain diameter of said abrasive particle is 1.0 μ m～10.0 μ m.
5. according to the grinding processing method of any described optical glass in the claim 1～4, it is characterized in that,
The rotating speed of the said cup-shaped abrasive material in the said grinding process is more than the 18000rpm and below the 30000rpm.
6. according to the grinding processing method of any described optical glass in the claim 1～5, it is characterized in that,
Said glass forming body in the said grinding process and said cup-shaped abrasive material are that 1.0 μ m/ are more than second and 15.0 μ m/ below second in the feed speed that the relative position on the butt changeable pressure direction moves.
7. the grinding processing method of optical glass according to claim 3 is characterized in that,
Said binding material is made up of metal adhesive or resinoid bond.
8. the manufacturing approach of an optical glass lens, this manufacturing approach is used the grinding processing method of any described optical glass in claim 1～7, makes optical glass lens based on said glass forming body.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| JP2011065798 | 2011-03-24 | ||
| JP2011-065798 | 2011-03-24 | ||
| JP2012053776A JP5916103B2 (en) | 2011-03-24 | 2012-03-09 | Optical glass grinding method and optical glass lens manufacturing method |
| JP2012-053776 | 2012-03-09 |
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| CN102689254A true CN102689254A (en) | 2012-09-26 |
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Cited By (3)
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| CN104589184A (en) * | 2015-02-11 | 2015-05-06 | 程灏波 | Adaptive annular polishing device for large-aperture non-spherical optical element |
| CN107322374A (en) * | 2017-08-24 | 2017-11-07 | 苏州鑫河镜业有限公司 | Mirror method is finely ground in a kind of programme-control |
| CN110757121A (en) * | 2019-10-22 | 2020-02-07 | 杭州承扬自动化科技有限公司 | Installation line suitable for installation of large glass |
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| CN102689254B (en) | 2016-12-14 |
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