CN102689254B

CN102689254B - The grinding processing method of optical glass and the manufacture method of optical glass lens

Info

Publication number: CN102689254B
Application number: CN201210080370.1A
Authority: CN
Inventors: 下嶋胜治
Original assignee: Hoya Corp
Current assignee: Hoya Corp
Priority date: 2011-03-24
Filing date: 2012-03-23
Publication date: 2016-12-14
Anticipated expiration: 2032-03-23
Also published as: CN102689254A

Abstract

The present invention provides the grinding processing method of optical glass and the manufacture method of optical glass lens, for the glass forming body being made up of the difficult processing glass material of optical glass, it is possible in the case of not reducing quality, perform grinding at low cost.Realized by following operation: the electric conductivity cup-shaped abrasive material in the grinding face making to have fine ginding processing be connected to the thick grinding of glass forming body being made up of the difficult processing glass material of optical glass before be ground face, and carry out rotating driving to this cup-shaped abrasive material, thus carry out fine ginding (S6b), when performing this grinding process, to providing electric conductivity grinding fluid between the electrode being disposed in the position relative with the grinding face of cup-shaped abrasive material and cup-shaped abrasive material, simultaneously to applying predetermined voltage between electrode and cup-shaped abrasive material, thus perform the dressing in grinding face.

Description

The grinding processing method of optical glass and the manufacture method of optical glass lens

Technical field

The present invention relates to the grinding processing method of optical glass and the manufacture method of optical glass lens.

Background technology

Optical glass lens for optical devices such as photographing units (is the most also referred to as eyeglass.) can be by by adjusting Become to have the glass forming body that the glass material (glass material) of desired optical characteristics makes and carry out grinding, Jin Erjin Row attrition process obtains.

Grinding therein needs the operation in following two stage: carrying out as the product with machined surfaces such as roughness After matter compares the thick grinding of the preferential manufacturing procedure focusing on working (machining) efficiency, carry out as adjusting form accuracy and surface shape The fine ginding processing of the manufacturing procedure of state.Specifically, grinding method shown below has been visualized.

Such as, in patent documentation 1, use sphere to create machine (hereinafter referred to as CG) and carry out thick grinding process, then carry out It is equally based on the fine ginding operation of CG, thus performs the grinding process of eyeglass.

Additionally, in patent documentation 2, disclose following method: extensively public in the roughing mode as spherical lens That know, carry out, in rough machined filing, applying On-line electrolytic dissolution and repairing to sphere by employing the milling of cup-shaped abrasive material/mill processing Sharp filing (ELID:Electrolytic In-process Dressing), in this electrolytic in-process dressing filing, uses Electric conductivity abrasive material, carries out electrolysis to this abrasive material while machined object (workpiece) is carried out grinding.

Additionally, Patent Document 3 discloses method for grinding based on CG processing.

[patent documentation 1] Japanese Unexamined Patent Publication 8-132340 publication

[patent documentation 2] Japanese Unexamined Patent Publication 2000-246613 publication

The practical new case of [patent documentation 3] Japan logs in No. 2600063 publication

Optical glass lens can be manufactured by various methods, but, in order to reduce because grinding, grinding add as far as possible Decrement that work causes and shorten process time, be achieved in the reduction of cost, be used mostly and have and light to be produced Learn the products formed of the shape of glass lens approximation.

The products formed (glass forming body) of optical glass is by according to the optical glass lens used in each optical device Function and the glass material (glass material) that suitably selects is constituted.Such as have shown below, there is special light by being adjusted to Learn the optical glass that the glass material of characteristic is constituted.

In recent years, as the formation material of optical glass lens, sometimes use as optical glass a kind of difficulty add Work glass material.So-called difficult processing glass material, refer to need in the machining eyeglass technique in eyeglass manufacturing process lower necessarily The glass material of time, such as, have the material softer beyond than difficulty processing glass material thus the easy character damaged or mistake Hard thus be difficult to the character (i.e. unworkability) of processing.

But, in the case of the glass forming body formed by difficulty processing glass material is performed grinding, due to difficulty The unworkability of processing glass material, can cause damage to be deep into surface etc., it may be difficult to obtain being suitable for optical glass lens Quality be ground face.

For this damage, it is also contemplated that be removed the milled processed of surface damage after grinding.But, in order to go Removing the damage being deep into surface, milled processed needs a lot of time (such as compared with common glass material, to need 2～3 times Time), and, then can not tackle with appropriate milled processed without masterful technique, it is contemplated that this situation, Result may cause the increase of the processing cost for the glass forming body formed by difficulty processing glass material.

Specifically, add the glass forming body being made up of the difficult processing glass material with unworkability is carried out grinding In the case of work, such as when utilizing CG processing etc. to make the grinding face of abrasive material abut with the face of being ground, if the most modestly Perform, then likely result in the generation of above-mentioned damage.

That is, in the case of the glass forming body being made up of difficulty processing glass material is carried out grinding, although carry out Those skilled in the art are generally known, the grinding in two stages disclosed in such as patent documentation 1, i.e. utilize the CG to add Work, after the preferential thick grinding focusing on working (machining) efficiency, performs tune having carried out compared with the quality of the machined surface such as roughness The fine ginding processing of shape precision and apparent condition, but in order to ensure being ground the quality in face, it is likely that need execution to be used for Remove the milled processed as described above of damage, the increase of processing cost may be caused.

Additionally, in patent documentation 2, to by a kind of BK7 as optical glass, (borosilicate crown, according to Japan Optical Glass Industrial can the abrasion degree measured of standard JOGIS-10 be 118) glass forming body that constitutes, using granularity is #325, # 600, these 3 kinds of abrasive materials of #4000, have carried out being divided into the multistage of roughing (thick grinding) and polish (fine ginding processing) to grind Cut processing.Therefore, in patent documentation 2, the glass forming body being made up of difficulty processing glass material is being carried out grinding In the case of, also as patent documentation 1, although carried out the grinding in two stages, but in order to ensure being ground the product in face Matter, it is likely that need the milled processed as described above performed for removing damage, the increase of processing cost may be caused.

Summary of the invention

Therefore, the present invention visualizes to solve the problems referred to above, it is provided that the grinding processing method of optical glass and The manufacture method of optical glass lens: for be made up of the difficult processing glass material as the glass material with unworkability Glass forming body, it is possible in the case of not reducing quality (quality being ground thing guarantees), low cost (pressing down of processing cost System) perform grinding.

1st mode of the present invention is the grinding processing method of a kind of optical glass, it is characterised in that this grinding processing method Including following operation: grinding process, the electric conductivity cup-shaped abrasive material with the grinding face of fine ginding processing is made to be connected to by conduct The face that is ground before the thick grinding of the glass forming body that the difficult processing glass material of optical glass is constituted, and this cup-shaped is ground Material carries out rotating driving, thus carries out fine ginding；And electrolytic in-process dressing operation, this electrolytic in-process dressing operation is to carry out During described grinding process, to being disposed in the electrode of the position relative with the grinding face of described cup-shaped abrasive material and described cup-shaped abrasive material Between electric conductivity grinding fluid is provided, simultaneously to applying predetermined voltage between described electrode and described cup-shaped abrasive material, thus carry out institute The dressing in the grinding face of stating.

2nd mode of the present invention is in the invention described in the 1st mode, it is characterised in that described difficult processing glass material Low by fluophosphate glass, phosphoric acid glass, the high index of refraction high-dispersion glass containing niobium phosphate or the high index of refraction containing lanthanum borate Any one in dispersive glass is constituted.

3rd mode of the present invention is in the invention described in the 1st or the 3rd mode, it is characterised in that described cup-shaped abrasive material bag Carrying out the abrasive particle of grinding containing to the described face that is ground and combine the binding material of this abrasive particle, the granularity of described abrasive particle is #2000～# 8000。

4th mode of the present invention is in the invention described in the 3rd mode, it is characterised in that the mean diameter of described abrasive particle It is 1.0 μm～10.0 μm.

5th mode of the present invention is in the 1st～the 4th mode in invention described in any one mode, it is characterised in that The rotating speed of the described cup-shaped abrasive material in described grinding process is more than 18000rpm and below 30000rpm.

6th mode of the present invention is in the 1st～the 5th mode in invention described in any one mode, it is characterised in that Described glass forming body in described grinding process moves in the relative position abutted on pressure direction-changeable with described cup-shaped abrasive material Dynamic feed speed is the 1.0 μm/more than second and 15.0 μm/below the second.

7th mode of the present invention is in the invention described in the 3rd mode, it is characterised in that described binding material is by metal Binding agent or resinoid bond are constituted.

8th mode of the present invention is the manufacture method of a kind of optical glass lens, and this manufacture method uses the 1st～the 7th side The grinding processing method of optical glass described in any one mode in formula, manufactures optical glass mirror based on described glass forming body Sheet.

According to the present invention, for the glass being made up of the difficult processing glass material as the glass material with unworkability Molded body, it is possible to perform grinding in the case of not reducing quality at low cost.

Accompanying drawing explanation

Fig. 1 is the schematic configuration of the optical glass grinding attachment illustrated as embodiments of the present invention for explanation Figure.

Fig. 2 is the flow chart of an example of the manufacturing step illustrating general optical glass lens.

Fig. 3 is the flow chart of an example of the manufacturing step illustrating the optical glass lens in embodiments of the present invention.

Fig. 4 is the figure of the mechanism for electrolysis based on ELID filing is described.

Fig. 5 is the explanatory diagram illustrating the processing conditions in embodiments of the invention 1～embodiment 7.

Fig. 6 is the explanatory diagram illustrating the processing conditions in embodiments of the invention 8～embodiment 10.

Fig. 7 is the explanatory diagram illustrating the processing conditions in embodiments of the invention 11～embodiment 12.

Fig. 8 is the explanatory diagram illustrating the processing conditions in embodiments of the invention 13～embodiment 15.

Fig. 9 is the explanatory diagram illustrating the processing conditions in the comparative example 1 of the present invention～comparative example 2.

Label declaration

1: optical glass grinding attachment；2: turntable；3: cup-shaped abrasive material；3a: abrasive particle portion；4: electrode；5: grinding fluid supply unit； 6: voltage application portion；7: movement controller；10: punching press product.

Detailed description of the invention

Hereinafter, use accompanying drawing that the mode of the present invention is described.

In the present embodiment, grinding to the optical glass employing optical glass grinding attachment in the following order The manufacture method of method and optical glass lens illustrates.

1. for the explanation of difficulty processing glass material

2. the structure of optical glass grinding attachment

3. the action example of optical glass grinding attachment

4. the effect of present embodiment

<1. for the explanation of difficulty processing glass material>

In the present embodiment, the difficult processing glass material being ground thing forming grinding is equivalent to optical glass The one of glass material, but different from other kinds of glass material (kind beyond i.e. difficult processing glass material), and difficulty adds Work glass material is the glass material needing lower certain time in the machining eyeglass technique in eyeglass manufacturing process.Therefore, may be used Difficulty is processed glass material be interpreted as having and adding the glass of the character easily producing damage man-hour or be difficult to the glass of processing Glass.

Abrasion degree described later (FA) such as can be distinguished over difficulty by the difficult processing glass material of this character as benchmark Glass material beyond processing glass material.Herein, as an example, use by day for during abrasion degree (FA) stated after a measurement The standard specimen (glass material beyond difficult processing glass material, abrasion degree FA=100) that this Optical Glass Industrial can be specified comes The situation measuring abrasion degree illustrates.By difficulty processing glass material formed be ground thing (glass forming body) such as with standard The thing (glass forming body) that is ground of sample is compared, and has the softer thus character easily damaged (in glass set forth below Fluophosphate glass, phosphoric acid glass and containing the high index of refraction high-dispersion glass of niobium phosphate) or really up to the mark thus be difficult to The character (the high-refractivity and low-dispersion glass containing lanthanum borate in glass set forth below) of processing, i.e. unworkability, therefore Under needing, certain time tackles its unworkability.It addition, to really up to the mark and be difficult to the feelings that are processed of glass of processing Under condition, it usually needs use coarse grained abrasive (such as #270), bigger damage can be caused on the contrary.

In the above description, as the glass material beyond difficulty processing glass material, to glass as a example by standard specimen Character be illustrated, but be not limited to this, " the difficult processing glass material " in the present invention be abrasion degree FA be more than 45 and The optical glass of less than 95 or the optical glass that abrasion degree FA is more than 160 and less than 500, difficult processing glass material with Outer glass material refers to the abrasion degree FA optical glass more than 95 and less than 160.The present invention can be applied to this scope Glass.

As the object lesson of the optical glass being made up of this difficult processing glass material, fluophosphate glass, phosphorus can be enumerated Acid glass, the high index of refraction high-dispersion glass containing niobium phosphate or the high-refractivity and low-dispersion glass containing lanthanum borate.That is, In this manual, the glass herein illustrated formation material is defined as " difficult processing glass material ".In present embodiment In, by by these fluophosphate glasses, phosphoric acid glass, the high index of refraction high-dispersion glass containing niobium phosphate or the height containing lanthanum borate The glass forming body that any one glass in refractive index low dispersion is formed is ground thing (glass as sphere establishment processing Glass molded body).

Fluophosphate glass is low-refraction low dispersion, has following structure.Fluophosphate glass is containing as necessary The P of cation constituent⁵⁺、Al³⁺With alkaline-earth metal ion and containing as necessity anion component F^-And O^2-Optics Glass, be have refractive index (nd) be more than 1.45, Abbe number (vd) be more than 65 the optical glass of optical characteristics.Especially It is to preferably comprise the P5+ of 3～50 cationes %, 3～40 Al of cation %³⁺.Furthermore it is preferred that containing 20～95 aniones % F^-, and the O containing 5～80 aniones %^2-, preferably F^-And O^2-Total content be 100 aniones %.Additionally, as alkaline earth Metalloid ion, preferably comprises from by Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺More than at least one selected in the group of composition.Further, from pressing down The volatility of fluorphosphate glass processed, rodent aspect are set out, it is desirable to make O^2-Content relative to P⁵⁺The mol ratio of content O^2-/P⁵⁺Become more than 3.5.

Specifically, as fluophosphate glass, the optical glass of following ratio can be enumerated: in this optical glass, with sun Ion % represents, containing P⁵⁺: 3～50%, Al³⁺: 5～40%, Mg²⁺: 0～10%, Ca²⁺: 0～30%, Sr²⁺: 0～30%, Ba²⁺: 0～40%, Li⁺: 0～30%, Y³⁺:: 0～10%, La³⁺: 0～10%；Represent by anion %, containing F^-: 20～ 95%, O^2-: 5～80%.Additionally, the abrasion degree of fluophosphate glass (FA) is preferably 380～500, more preferably 400～460.

Phosphoric acid glass is low dispersion, has following structure.Phosphoric acid glass is such optical glass: become as necessity Point, containing P₂O₅、B₂O₃、Li₂O, MgO, CaO and BaO, and have refractive index (nd) be 1.50～1.70, Abbe number (vd) be 60 ～the optical characteristics of 70.

Specifically, as phosphoric acid glass, the optical glass of following ratio can be enumerated: in this optical glass, use matter Amount % represents, containing P₂O₅: 18～70%, B₂O₃: 1～35%, Al₂O₃: 0～8%, Li₂O:0～20% (wherein, eliminates 0%), Na₂O:0～18%, K₂O:0～15%, MgO:1～25%, CaO:0～18% (wherein, MgO+CaO ＞ 4%), SrO:0 ～20%, BaO:1～40%, ZnO:0～14%, Gd₂O₃: 0～18%, Sb₂O₃: 0～1%.Additionally, the abrasion of phosphoric acid glass Degree (FA) is preferably 250～350, more preferably 270～310.

High index of refraction high-dispersion glass containing niobium phosphate is the easy reduction being made up of W, Ti, Bi and Nb containing at least one The optical glass of composition, the content of these easy reducing components add up to 5～60 moles of %, and to have refractive index (nd) be 1.80 Above, Abbe number (vd) is the optical characteristics of less than 30.

Specifically, as the high index of refraction high-dispersion glass containing niobium phosphate, the optical glass of following ratio can be enumerated: In this optical glass, represent with a mole %, containing P₂O₅: 10～45%, Nb₂O₅: 3～35%, Li₂O:2～35%, TiO₂: 0 ～25%, WO₃: 0～20%, Bi₂O₃: 0～40%, B₂O₃: 0～20%, BaO:0～25%, ZnO:0～25%, Na₂O:0～ 50%, K₂O:0～20%, Al₂O₃: 0～15%, SiO₂: 0～15% (wherein, WO₃、TiO₂、Bi₂O₃And Nb₂O₅Total amount be more than Equal to 10% and less than 65%).Additionally, the abrasion degree (FA) of the high index of refraction high-dispersion glass containing niobium phosphate is preferably 150 ～300, more preferably it is set to 160～290.

High-refractivity and low-dispersion glass containing lanthanum borate be in addition to containing at least one be made up of W, Ti, Bi and Nb easy Beyond reducing component, possibly together with the B as neccessary composition₂O₃、La₂O₃, the optical glass of ZnO, be to there is refractive index (nd) be More than 1.8, Abbe number (vd) is the optical glass of optical characteristics of 25～50.In this optical glass, B₂O₃It is for realizing glass The cancellated neccessary composition of glass, La₂O₃It is for giving high index of refraction, the neccessary composition of low dispersion characteristics, due to two kinds of one-tenth Dividing and coexist, therefore the stability of glass improves further.

Specifically, as the high-refractivity and low-dispersion glass containing lanthanum borate, the optical glass of following ratio can be enumerated: In this optical glass, represent with a mole %, containing SiO₂: 0～50%, B₂O₃: 5～70%, Li₂O:0～20%, Na₂O:0～ 10%, K₂O:0～10%, ZnO:1～50%, CaO:0～10%, BaO:0～10%, SrO:0～10%, MgO:0～10%, La₂O₃: 5～50%, Gd₂O₃: 0～22%, Yb₂O₃: 0～10%, Nb₂O₅: 0～15%, WO₃: 0～20%, TiO₂: 0～ 40%, Bi₂O₃: 0～20%, ZrO₂: 0～15%, Ta₂O₅: 0～20%, GeO₂: 0～10%.Additionally, the height containing lanthanum borate The abrasion degree (FA) of refractive index low dispersion is preferably 45～95, more preferably 50～80.

As the object lesson of the fluophosphate glass in the optical glass being made up of this difficult processing glass material, can enumerate FCD1 (HOYA Corp.'s manufacture, nd=1.49700, vd=81.61).It is hard that the FCD1 herein illustrated such as has Knoop Degree Hk≤350N/mm²And the engineering properties of abrasion degree FA >=400.Therefore, with by difficulty processing glass material beyond glass material Optical glass (the such as Knoop hardness Hk >=500N/mm formed², abrasion degree FA≤200) compare, have softer thus add man-hour The easily feature of damage.

Additionally, as the concrete example of phosphoric acid glass, PCD4 (HOYA Corp.'s manufacture, nd=1.61800, vd can be enumerated =63.40) and PCD51 (HOYA Corp.'s manufacture, nd=1.59349, vd=67.00).

Additionally, as the concrete example of the high index of refraction high-dispersion glass containing niobium phosphate, E-FDS1 (HOYA strain formula can be enumerated Commercial firm's manufacture, nd=1.92286, vd=20.88), FDS18 (HOYA Corp.'s manufacture, nd=1.94595, vd=17.98) With FDS90 (HOYA Corp.'s manufacture, nd=1.84666, vd=23.78).

Additionally, as the concrete example of the high-refractivity and low-dispersion glass containing lanthanum borate, TAFD25 (HOYA strain formula can be enumerated Commercial firm's manufacture, nd=1.90366, vd=31.32), TAFD35 (HOYA Corp.'s manufacture, nd=1.91082, vd= 35.25), TAFD40 (HOYA Corp.'s manufacture, nd=2.00069, vd=25.46).

It addition, above-mentioned abrasion degree (FA) can standard JOGIS-10 be measured according to Japanese Optical Glass industry.It is measured Method is: be 9cm by measured area²Sample be held in the center with the cast iron planar disk of rotation the most per minute 60 turns At the fixed position of 80mm, it is supplied uniformly across within the period of 5 minutes in the 10g alumina abrasive grain of mean diameter 20 μm With the addition of the lapping liquid of 20ml water, and the load applying 9.807N is ground.Sample mass before and after grinding is entered Row is weighed and is obtained abrasion quality m.Measure the standard specimen that can be specified by Japanese Optical Glass industry in the same way Abrasion quality m₀, and utilize following formula to calculate abrasion degree (FA).

Abrasion degree (FA)=(m/d)/(m₀/d₀) × 100 ... (1) formula

Herein, d is the proportion of sample, d₀Proportion for standard specimen.

Fig. 1 is the optical glass that the glass forming body being made up of difficulty processing glass material carries out grinding for explanation The schematic diagram of the schematic configuration example of grinding attachment 1.

Optical glass grinding attachment 1 shown in Fig. 1 is following apparatus structure: typically cut by the corase grind of grinding Processing is ground to the curve formation processing filing of the machine (CG:Curve Generator) that formed based on curved surface used during sphere In (hereinafter referred to as " CG manufacturing procedure "), apply based on electrolytic in-process dressing (ELID:Electrolytic In-process Dressing) electrolytic in-process dressing filing (hereinafter referred to as " ELID operation ").It addition, about " CG manufacturing procedure ", " ELID Operation ", will be specifically described later.

As it is shown in figure 1, the optical glass grinding attachment 1 of explanation has turntable 2, cup-shaped abrasive material 3, electrode in present embodiment 4, grinding fluid supply unit 5, voltage application portion 6 and movement controller 7.

This optical glass grinding attachment 1 can be followed by the ELID in ELID operation according to the control of movement controller 7 Ring automatically carries out the dressing (burr) in the grinding face of cup-shaped abrasive material 3, utilizes cup-shaped abrasive material 3 by light by CG manufacturing procedure simultaneously The face that is ground learning the punching press product 10 that glass (difficult processing glass material) is made is ground to spherical shape.

It addition, the optical glass grinding attachment 1 shown in Fig. 1 is so-called vertical, it is shown that in the curved of grinding convex surface One-tenth machine applies the apparatus structure of electrolytic in-process dressing filing.Optical glass grinding attachment 1 shown in Fig. 1 can also be institute That calls is horizontal, can apply electrolytic in-process dressing filing in the curved surface formation machine of grinding concave surface.

Turntable 2 has the punching press product 10 kept as the glass forming body being made up of difficulty processing glass material being ground thing Chuck segment 2a.This chuck segment 2a is configured to be carried out rotation when remain punching press product 10 by not shown driving source and drives Dynamic.Chuck segment 2a liquidate laminate 10 holding can in the way of using vac sorb or make use of stationary fixture etc. known technology. Additionally, about carrying out turntable 2 rotating the driving source driven, it is possible to use the known driving sources such as motor.

Cup-shaped abrasive material 3 is formed as cup-shaped (having the cylindrical shape of open end), and open end is configured to and the chuck segment of turntable 2 2a is relative, and is provided with the abrasive particle portion 3a as grinding face near the end face of the side relative with chuck segment 2a.

That is, cup-shaped abrasive material 3 is configured to: make abrasive particle portion 3a can be connected to be held in chuck segment 2a of turntable 2 The punching press product 10 of the glass forming body being made up of difficulty processing glass material.

Abrasive particle portion 3a is to utilize the bond material (binding material) being made up of the metal material such as cast iron or bronze by diamond Abrasive particle is the most together.By using metal material as bond material so that cup-shaped abrasive material 3 is as having electric conductivity Metal bonded abrasive function.But, as long as having electric conductivity, it is also possible to be resin-bonded abrasive material.

Additionally, cup-shaped abrasive material 3 is configured to be carried out rotating by not shown driving sources such as motor drive.Cup-shaped abrasive material 3 The rotary shaft that rotary shaft is positioned at turntable 2 is at an angle of on the line of α.This angle [alpha] is the curvature 1 according to spherical lens to be made Determine than 1 ground, after determining angle [alpha] according to the curvature of eyeglass, be carried out continuously when maintaining this angle [alpha] in principle Processing.In order to tackle multiple lens shape, available not shown swing mechanism, make angle [alpha] preset range (such as 0 ° ～60 °) interior change.

Further, cup-shaped abrasive material 3 is configured to: can be by not shown travel mechanism, along the feeding side of this cup-shaped abrasive material 3 To, change the relative position with turntable 2." direction of feed " refers to change the glass molding being made up of difficulty processing glass material The punching press product 10 of body and the direction abutting pressure of abrasive particle portion 3a.For change the travel mechanism of the relative position of direction of feed by The known technology such as motor or feed screw is constituted.

As long as it addition, travel mechanism can change the relative position of turntable 2 and cup-shaped abrasive material 3, it is also possible to do not move Cup-shaped abrasive material 3 but mobile turntable 2.

Electrode 4 is configured to across predetermined gap (such as 0.1～0.3mm, preferably about 0.2mm) and cup-shaped abrasive material 3 Abrasive particle portion 3a relative.

Grinding fluid supply unit 5 is between the abrasive particle portion 3a and electrode 4 of cup-shaped abrasive material 3 and the abrasive particle portion 3a of cup-shaped abrasive material 3 And provide electric conductivity grinding between the punching press product 10 as the glass forming body being made up of difficulty processing glass material being ground thing Liquid.

As long as electric conductivity grinding fluid has the function of the resistance reduced between abrasive particle portion 3a and electrode 4.Specifically, As electric conductivity grinding fluid, it is considered to use and there are a certain degree of electrical conductivity (such as 1300～1800 μ S/cm, preferably 1500 ～1600 μ about S/cm) the Water-soluble grinding fluid of ELID grinding.

Voltage application portion 6 with the electrode 4 (just), corresponding thereto as the cup-shaped abrasive material 3 of metal bonded abrasive as anode is Negative electrode (is born), to applying DC pulse voltage between these poles.

Therefore, voltage application portion 6 is configured to have: produce ELID power supply 6a and the cup-shaped of predetermined DC pulse voltage The rotary shaft sliding contact of abrasive material 3 for brush 6b, be connected to ELID power supply 6a and between brush 6b and ELID power supply 6a And the electric current supplying wire 6c between electrode 4.

Movement controller 7 controls the action of above-mentioned various piece 2～6.By the control of this movement controller 7, as below As concrete narration, at least set the rotating speed of cup-shaped abrasive material 3, turntable 2 and cup-shaped abrasive material 3 relative position in feed direction The feed speed of movement.

Then, the action example of the optical glass grinding attachment 1 of said structure is illustrated.

Herein, the feelings of the optical glass grinding attachment 1 of said structure will be used in the manufacture method of optical glass lens Condition is for for example.

(summary of the manufacture method of optical glass lens)

Optical glass lens can be manufactured by various methods, but, in order to reduce because grinding, grinding add as far as possible Decrement that work causes and shorten process time, be achieved in the reduction of cost, be used mostly and have and final lens shape The punching press product of the shape of approximation.Punching press product include: the glass blank being used for being formed punching press product is carried out thermoplastic and at mould Drop stamping again (the Reheat Press, hereinafter referred to as " RP " inside carrying out punching press and obtain.) product；Fused glass block is provided In lower mold and use direct punching press that mold and lower mold carry out punching press and obtain (Direct Press, hereinafter referred to as “DP”.) product.RP product carry out heating, softening and punching press, the therefore accuracy of refractive index after measuring the refractive index of product again Excellent.On the other hand, about DP product, the glass materials such as raw material are melted, and the melten glass after clarifying, homogenizing Isolate fused glass block, after at high temperature making fused glass block deliquescing, directly carry out punching press, thus shape with compacted under mould Become this DP product, thus DP product are excellent in terms of the dimensional accuracy of profile, wall thickness etc..It addition, the punching press product of thus molding, no matter Being RP product or DP product, its surface roughness Rz is below 2.0 μm.

(general manufacturing step)

It is said that in general, optical glass lens manufactures the most as follows: to punching press product as RP product or DP product, successively Perform to carry out roughly grinding the corase grind cut cut manufacturing procedure and carry out the fine ginding manufacturing procedure of fine ginding, thus, by glass forming body The face that is ground as lens surface be ground to spherical shape, and then perform this is ground the attrition process that face is ground Operation.

(adjustment/mixing of S1: raw material)

When the manufacture of optical glass lens, first, in order to obtain the optical glass with desired optical characteristics, above The predetermined ratio allotment stated constitutes the above-mentioned constituent of this optical glass, obtains the basic glass material as this optical glass (i.e. difficult processing glass material) (S1).Glass material described herein refer to the metal-oxide by referred to as raw material (batch) or Powder body that inorganic oxide etc. are constituted and/or cool down after raw material are carried out once thick melting and the cullet that obtain, mostly Situation refers to raw material.

(melted/clarification of S2: glass)

Afterwards, its melted (melting), clarification (bag are made in the glass material obtained in above-mentioned steps S1 being put into melting furnace Containing deaeration), and make the melten glass after homogenizing (glass of the state after i.e. raw material are melted) flow out the outflow of pipeline from glass Mouth flows out.

(molding of S3: glass～S5A:RP product)

Further, such as in the case of employing RP product, on mold, take out in the horizontal direction from melting that pipeline flows out Glass.The melten glass taken out from mold moves horizontally in continuous annealing furnace, and anneals in stove.This is at nitrogen etc. Inert gas environment is gradually carried out cool down so that the operation of not residual deformation etc. in glass after cooling down.Thus, obtain Melten glass has been carried out the glass forming body (S3) after molding.After annealing, separate from glass forming body with predetermined length The part gone out is the E shape bar (vitreous body of tabular) (S4A) of reservation shape.Afterwards, there is such operation: will be from continuous print glass Glass molded body isolated E shape bar (vitreous body of tabular) is divided into multiple glass of the referred to as such as cubic of cutting sheet Sheet, and carry out the cold working such as grinding or grinding (adjusting cubical chamfering and deviation of weight), become predetermined through this operation Shape/predetermined, thus obtains the glass blank of reheating punch forming.To thus obtained reheating punch forming glass Glass blank carries out under thermoplastic state, uses mould to carry out punch forming, thus obtains as manufacturing optics The RP product (S5A) of the blank of glass lens.Now, reheating punch forming glass blank can be supplied to into after heating in advance Mould (non-isothermal punch forming), and, it is also possible to after being supplied to mould, carry out heating punching together with mould Pressure (isothermal punch forming).

(molding of S3: glass～S5B:DP product)

On the other hand, such as in the case of employing DP product, fused glass block is provided the lower mold being configured at turntable On tool, and to utilize mold and lower mold be desired shape (S3, S4B, S5B) by fused glass block punch forming.Now, under The temperature of mould is adjusted to: be not result in providing (cast) fused glass block to lower mold because contacting and quilt with lower mold Quick refrigeration thus stamping forming situation can not be carried out.Lower mold temperature is lower than the temperature of melten glass, therefore, from watering Note to carrying out punch forming and taking out glass forming body (DP product, eyeglass after (take out) molding from punch-forming mold Blank) till during, gradually seize, from the contact surface of glass Yu lower mold, the heat that glass forming body is had.Further, When punch forming, although also have adjusted the temperature of mold, but the temperature of mold is typically low than the temperature of melten glass, Therefore, in the period that mold contacts with fused glass block or manufacturing press-molded products, mold also can seize fused glass block and glass The heat that glass products formed is had.It addition, when isolating fused glass block from melten glass stream, can be by obtain The weight of glass blocks and naturally drip, or, it is possible to use being cooled to will not a pair shearing tool (shear of thermal welding Blade) clip melten glass to cut off such that it is able to obtain fused glass block.In addition, as the cut-out of melten glass Method, it is also possible to use the following decline process of chopping: the lower section making lower mold rise to the flow export that glass flows out pipeline connects Receive melten glass, and after reaching predetermined weight, make lower mold decline with the fireballing speed that flows down than melten glass, thus Cut off melten glass.In the explanation closed with this DP condition, melten glass be raw material melted after the appellation of glass of state, Melten glass stream is the melten glass flowed down from pipeline, and fused glass block is the glass from melten glass flow separation (drip or cut off) Glass block, glass forming body refers to the glass object after punching press (i.e. DP product).It addition, in the above description, illustrate melten glass Block provides in lower mold so that the example that contacts with lower mold of fused glass block, however, it is possible to use shape in lower mold Become the suspension molding mould having the pore for making fused glass block suspend, rush when making fused glass block suspend Molded.

(grindings of S6:RP product/DP product)

After obtaining RP product or DP product through above step, RP product or DP product are carried out the eyeglass for obtaining intended shape The grinding (S6) on surface.Such as, sequentially pass through and carry out roughly grinding the thick grinding process (S6a) cut and the fine grinding carrying out fine ginding Cut operation (S6b) and carry out grinding.Thick grinding process (S6a) is the quality compared to grinding faces such as surface roughnesses, excellent First focus on working (machining) efficiency and the grinding process that performs, be such as to use the grain size number representing abrasive grain less than #600, more specifically For the grinding process that performs for the cup-shaped abrasive material of about #325.On the other hand, fine ginding operation (S6b) is primarily used for adjusting Shape precision and apparent condition and the grinding process that performs, be such as use the grain size number representing abrasive grain be #600 with Upper, the cup-shaped abrasive material of more specifically about #1500～#8000 and the grinding process that performs.

(S7: grinding product are ground)

Through grinding process (S6, S6a, S6b), the part as lens surface of RP product or DP product is being ground to sphere After shape, these grinding product are removed the damage of the lens surface after grinding or reduce lens surface further The milled processed (S7) of surface roughness.Through the step of above series of, produce lens surface and be processed to spherical shape Optical glass lens (spherical lens) (S8).

(manufacturing step in present embodiment)

Compared with the general manufacturing step of optical glass lens described above, in the present embodiment, not in accordance with Manufacturing procedure cut by corase grind, fine ginding manufacturing procedure performs grinding operation in two stages, but utilizes the light of said structure Learn glass grinding device 1, use and be there is the abrasive particle portion 3a being formed as grinding face by multiple abrasive particles of fine ginding processing Cup-shaped abrasive material 3, it is possible to merely with the grinding operation in a stage, perform corase grind simultaneously and cut manufacturing procedure and fine ginding adds Work operation.

Fig. 3 is the flow chart of an example of the manufacturing step illustrating the optical glass lens in present embodiment.

Grinding (S6) and above-mentioned general manufacturing step in the manufacturing step shown in Fig. 3, to RP product or DP product Situation different.In the case of the general manufacturing step shown in above-mentioned Fig. 2, it is periodically to have carried out thick grinding process And fine ginding operation (S6b) (S6a).On the other hand, in the case of the manufacturing step shown in Fig. 3, without thick grinding process (S6a) fine ginding operation (S6b) and has directly been carried out.That is, in grinding (S6), thick grinding process (S6a) is eliminated.This Be because, according to the optical glass grinding attachment 1 of explanation in present embodiment, as concrete narration below, carry out based on The electrolysis of ELID filing, therefore, it is possible to perform CG processing cup-shaped abrasive material 3 is carried out burr, it is possible to efficiently Carry out grinding.Further, according to the optical glass grinding attachment 1 of explanation in present embodiment, as described later, it is possible to the most real The quality of existing machined surface guarantees the suppression with processing cost, it is possible to the glass molding material product before cutting for corase grind, with shorter The grinding time obtains the processing quality after fine ginding.

(concrete condition of the action example of optical glass grinding attachment)

Then, the action example of optical glass grinding attachment 1 is illustrated.

Optical glass grinding attachment 1 is in the above-mentioned operation, to as being ground being made up of difficulty processing glass material of thing The punching press product (RP product or DP product) 10 of glass forming body carry out grinding.

The grinding that optical glass grinding attachment 1 is carried out is to apply ELID operation in above-mentioned CG manufacturing procedure.With Under, this each operation is described successively.

(CG manufacturing procedure)

CG manufacturing procedure is such operation: to the optical glass (glass forming body) being made up of difficulty processing glass material Punching press product 10 carry out CG processing, using the face that is ground (i.e. as the position of the lens surface) grinding of the punching press product 10 of this optical glass Become spherical shape.

In CG manufacturing procedure, first using as the glass forming body being made up of difficulty processing glass material being ground thing Punching press product 10 are held in chuck segment 2a of turntable 2.Then, swing mechanism is made to move according to the control instruction from movement controller 7 Make, the rotary shaft of cup-shaped abrasive material 3 is fixed on following location: the curvature that this position has the lens surface with institute grinding is corresponding Angle [alpha], and abrasive particle portion 3a is on lens light axis with the contact site of lens surface.

In this state, indicate according to the control from movement controller 7, with desired speed, turntable 2 is rotated Drive, and, carry out rotating driving to cup-shaped abrasive material 3 with the desired speed different from turntable 2.

Further, indicate according to the control from movement controller 7 and make travel mechanism's action, make the abrasive particle portion of cup-shaped abrasive material 3 3a abuts with the punching press product 10 of the glass forming body being made up of difficulty processing glass material in chuck segment 2a being held in turntable 2, And change turntable 2 and cup-shaped abrasive material 3 relative position in feed direction with predetermined feed speed.

By carrying out above action, in CG manufacturing procedure, utilize by the public affairs rotating the cup-shaped abrasive material 3 realized of turntable 2 Turn and by the rotation rotating this cup-shaped abrasive material 3 realized of cup-shaped abrasive material 3, to the glass molding being made up of difficulty processing glass material The punching press product 10 of body carry out CG processing.

I.e. so that the face that is ground of the cup-shaped abrasive material 3 being driven in rotation i.e. abrasive particle portion 3a processes glass material structure with by difficulty Become glass forming body punching press product 10 in as glass forming body lens surface the face that is ground abut, thus this is ground Bevel is ground to spherical shape.

(ELID operation)

ELID operation is in the execution of CG manufacturing procedure, cup-shaped abrasive material 3 is carried out electrolysis based on ELID filing and repaiies Sharp operation.

Therefore, in ELID operation, at least at the light starting to be connected to be made up of difficulty processing glass material from cup-shaped abrasive material 3 Learning the period the punching press product 10 of glass terminate to the grinding of this cup-shaped abrasive material 3, movement controller 7 is to grinding fluid supply unit 5 Following control is provided to indicate with voltage application portion 6.

That is, grinding fluid supply unit 5 according to from movement controller 7 control indicate, to the abrasive particle portion 3a of cup-shaped abrasive material 3 with Between electrode 4 and cup-shaped abrasive material 3 abrasive particle portion 3a with as being ground being become by the difficulty processing glass that constitutes of glass material of thing Electric conductivity grinding fluid is provided between the punching press product 10 of type body.

Additionally, voltage application portion 6 indicates according to the control from movement controller 7, ELID power supply 6a is made to produce predetermined DC pulse voltage.

By carrying out above action, in ELID operation, by the electric current supplying wire 6c of voltage application portion 6 with for brush 6b, To applying DC pulse voltage between cup-shaped abrasive material 3 and electrode 4, thus automatic to the i.e. abrasive particle portion 3a in grinding face of cup-shaped abrasive material 3 Carry out burr (electrolysis).

That is, in the execution of CG manufacturing procedure, to providing electric conductivity grinding fluid between cup-shaped abrasive material 3 and electrode 4, execute simultaneously Making alive, carries out electrolysis to cup-shaped abrasive material 3.

Fig. 4 is the explanatory diagram of the mechanism of the electrolysis being illustrated based on ELID filing.

In ELID filing, first, by applying voltage, the bond material 3b of abrasive particle portion 3a is electrolysed, is fitted Prominent (with reference to Fig. 4 (a)) of the diamond abrasive grain 3c of degree.Therebetween, the part of the bond material 3b that electrolysis is liquated out is insulated Changing, be deposited in abrasive material end face and form insulator coverlay 3d, therefore Faradaic current reduces automatically.Now, initial dressing completes (with reference to Fig. 4 (b)).

Actual when performing grinding in this condition, the insulator coverlay 3d of abrasive material end face be ground the surface of thing (i.e. The punching press product 10 of optical glass being made up of difficulty processing glass material be ground face) contact, thus because friction is stripped removal, And meanwhile, diamond abrasive grain 3c start grinding be ground thing and produce abrasive particle abrasion (with reference to Fig. 4 (c)).

Then, the insulating properties of abrasive material end face reduces, and Faradaic current recovers.Thus, from abrasion after diamond abrasive grain 3c it Between position thinning for insulator coverlay 3d restart be electrolysed liquate (with reference to Fig. 4 (d)), retrieve diamond abrasive grain 3c Prominent (with reference to Fig. 4 (b)).

(processing conditions in present embodiment)

Then, processing conditions when optical glass grinding attachment 1 performs above-mentioned CG manufacturing procedure and ELID operation is carried out Explanation.

Optical glass grinding attachment 1 will be added by the difficulty being difficult to only perform fine ginding processing without thick grinding The punching press product 10 of the glass forming body that work glass material is constituted are as being ground thing.Therefore, as already described, supposing Under the conventional processing conditions of the glass forming body being made up of the glass material beyond difficulty processing glass material, it is difficult to the most real The quality of existing machined surface guarantees the suppression with processing cost.

Therefore, optical glass grinding attachment 1, with processing conditions as described below, performs to constitute by difficulty processing glass material The processing of punching press product 10, the most above-mentioned CG manufacturing procedure and the ELID operation of glass forming body.This processing conditions is based on this The understanding that obtains based on the design being not belonging to conventional technology general knowledge of inventor of application and realize.

Processing conditions for the punching press product 10 of the glass forming body being made up of difficulty processing glass material is: process work at CG In sequence, compared with the situation of the grinding performing thick grinding and fine ginding processing the two stage, by cup-shaped abrasive material 3 Rotating speed and turntable 2 are set to higher with cup-shaped abrasive material 3 feed speed moved relative to position in feed direction.These Processing conditions is supplied to rotary driving source and the travel mechanism etc. of cup-shaped abrasive material 3 as the instruction that controls from movement controller 7.

Specifically, for the rotating speed of cup-shaped abrasive material 3, it is set as such condition: with the thick grinding of execution and fine grinding Cut processing the two stage grinding time rotating speed be 10000rpm (rotation per minute) below (referring for example to Patent documentation 3) this condition compares, and makes the rotating speed of cup-shaped abrasive material 3 become the high rotating speed i.e. 18000rpm more than higher than its rotating speed. As long as the higher limit of rotating speed is in the permissible revolution of the rotary shaft bearing portion of cup-shaped abrasive material 3 (i.e. in the range of the rating of machine of device) ?.But, there is disconnected film in the electric conductivity grinding fluid in order to avoid providing when performing ELID operation, it is also contemplated that will such as About 40000rmp is set to the upper limit.That is, the rotating speed of cup-shaped abrasive material 3 is set to more than 18000rpm and below 40000rpm, preferably It is set to about 20000rpm～30000rpm.

Additionally, about the feed speed moved relative to position of turntable 2 with cup-shaped abrasive material 3, be set as such condition: only It is 1.0 μm/more than sec and below 15.0 μm, preferably 2.0 μm/more than sec and 15.0 μm/below sec.

About other processing conditionss, can be with the glass molding that the glass material beyond being processed glass material by difficulty is constituted The situation that body carries out grinding is identical.Such as, for the rotating speed of turntable 2, as long as meeting the condition of 1～100rpm, preferably set It is set to the condition of about 50rpm.Additionally, such as about the applying voltage of voltage application portion 6, as long as meeting the condition of 30～150V , it is preferably set to the condition of about 150V.

It addition, in the present embodiment, have employed processing conditions described above, and in the execution of CG manufacturing procedure Perform ELID operation, the abrasive particle portion 3a of cup-shaped abrasive material 3 is carried out burr (electrolysis) automatically.

Therefore, in the present embodiment, about the abrasive grain diameter of the abrasive particle portion 3a of cup-shaped abrasive material 3, do not use from coarse to fine The method periodically changed, but just use the abrasive grain diameter (grain size number of such as abrasive particle of fine ginding processing from the outset For #1500～#8000, being about #2000 when preferably representing by granularity, mean diameter is 1 μm～5 μm) carry out grinding and add Work, i.e. in grinding (S6), it is possible to realizes such mode: directly refine without thick grinding process (S6a) Cut operation (S6b).

That is, it not to utilize thick grinding process and fine ginding operation in two stages the face that is ground before thick grinding to be entered Row grinding, but just use from the outset and there is the grinding face i.e. abrasive particle portion formed by multiple abrasive particles of fine ginding processing The cup-shaped abrasive material 3 of 3a carries out grinding.

Thus, if employing the cup-shaped abrasive material 3 of the abrasive particle portion 3a with fine ginding processing, and ELID work is used in the lump Sequence, then can carry out burr, all the time therefore, even if at the punching press product 10 to the glass forming body being made up of difficulty processing glass material In the case of carrying out grinding, for being ground face, do not have as increasing process time yet, relatively deep damage occurs Situation, thus carries out grinding, its result, guarantees that aspect is ideal in the quality realizing machined surface.

The optics performed according to the optical glass grinding attachment 1 of explanation, this optical glass grinding attachment 1 in present embodiment The grinding processing method of glass and use the manufacturer of optical glass lens that the grinding processing method of this optical glass carries out Method, it is possible to obtain effect as described below.

According to present embodiment, difficulty the punching press product 10 processing the glass forming body that glass material is constituted are being carried out grinding In the case of processing, the execution of CG manufacturing procedure performs ELID operation, and performs this CG with following processing conditions and add Work operation: compared with the situation of the grinding performing thick grinding and fine ginding processing the two stage, by cup-shaped abrasive material 3 Rotating speed and feed speed both sides be set to higher.

Therefore, though using the punching press product 10 of glass forming body that are made up of difficulty processing glass material as being ground thing In the case of, it is also possible to the quality simultaneously realizing machined surface guarantees the suppression with processing cost, and this supposes to perform in the prior art It is difficult under the processing conditions of the situation of the grinding in two stages.

That is, even if grinding with the cup-shaped with the i.e. abrasive particle portion 3a in grinding face formed by multiple abrasive particles of fine ginding processing In the case of material 3 execution grindings, for being ground face before thick grinding, do not have yet and increase like that process time , the situation that relatively deep damage occurs, thus carry out grinding, it is possible to reliably obtain the adding of quality being suitable for glass lens Work face.

Herein, it is suitable for the quality of glass lens, when referring to after grinding and before milled processed, Surface roughness Rz being such as ground face is below 1 μm.This is because, if surface roughness Rz is below 1 μm, then can The milled processed carried out accurately and the most afterwards.Additionally, due to the damage of lens surface can be suppressed Wound, therefore, milled processed need not more time and skilled technical ability etc., and, moreover it is possible to utilize the high speed of feed speed etc. Changing the fast (shortening process time) realizing CG manufacturing procedure, therefore, its result is can to suppress for being processed glass by difficulty The increase of the processing cost of the glass forming body that material is formed.

These effects are based on reason described below and deduce.

In the present embodiment, the execution of CG manufacturing procedure performs ELID operation.Therefore, by the mill of ELID operation The effect of file (electrolysis), the abrasive particle portion 3a of cup-shaped abrasive material 3 can fully maintain diamond abrasive grain to highlight from bond material State, i.e. so-called sword is stung out.

And, cup-shaped abrasive material 3 is with the feelings than the grinding performing thick grinding and fine ginding processing the two stage The higher speed of condition carries out rotating driving.Therefore, if from the punching press product 10 of the optical glass being made up of difficulty processing glass material The face that is ground (i.e. as the position of lens surface) observe, compared with the situation of usual processing conditions, because of the effect of ELID It is in the diamond abrasive grain of the state that sword stings out in time per unit by scouring more.

Thus, the face that is ground of the punching press product 10 of glass forming body become do not exist cutting residue well cut shape State.Additionally, due to cutting residue will not be produced, it is thus possible to be reduced by resistance when cup-shaped abrasive material 3 carries out grinding Power.Complement each other with this, i.e. pass through to perform ELID operation and make cup-shaped abrasive material 3 high speed rotating so that processed glass by difficulty The face that is ground of punching press product 10 of the glass forming body that glass material is constituted becomes the face that is ground of the quality being suitable for eyeglass, and not There will be and increase the situation such, relatively deep damage occurs process time.

Further, in the present embodiment, with the thick grinding of execution and the grinding in fine ginding processing the two stage Situation compare, turntable 2 is set to higher with cup-shaped abrasive material 3 feed speed moved relative to position in feed direction.

That is, the amount of feeding moved relative to position of time per unit is bigger than the situation of common grinding.It is said that in general, If the amount of feeding is big, then damage is easily accessible the face of being ground.But, in the present embodiment, cup-shaped abrasive material 3 is carried out at a high speed Rotate and drive.Therefore, it is possible to increase the amount of feeding moved relative to position, even and if in the case of increasing the amount of feeding, also Can suppress to damage entrance and be ground face.

Thus, if increasing the amount of feeding moved relative to position of time per unit, it is possible to needed for shortening grinding Time, it is accompanied by this, additionally it is possible to improve the grinding to the punching press product 10 being processed the optical glass that glass material is constituted by difficulty Efficiency.Therefore, it is possible to suppression for being processed the processing cost of the punching press product 10 of the glass forming body that glass material is constituted by difficulty Increase.

Additionally, in the present embodiment, with the thick grinding of execution and the grinding in fine ginding processing the two stage Situation compare, rotating speed and the feed speed both sides of cup-shaped abrasive material 3 are set to higher.Therefore, it is possible to it is reliably the most real The quality being now ground face guarantees the suppression with processing cost.

Such as, if only making feed speed high speed, and do not make rotating speed high speed, because the effect of feeding makes damage enter The probability being ground face is the highest, now can not be said to be and is simultaneously achieved the quality in the face of being ground and guarantees and the pressing down of processing cost System.That is, by rotating speed and the high speed of feed speed both sides, it is possible to the quality realizing the face that is ground guarantees and processing cost simultaneously Suppression.

On the other hand, if only making rotating speed high speed, then the quality being capable of the face that is ground guarantees.But, in order to same Shi Shixian is ground the quality in face and guarantees to suppress with processing cost, preferably makes feed speed high speed to realize the effect of grinding Rate improves.

It addition, present embodiment illustrate only a preferred embodiment of the present invention.That is, the invention is not restricted to this enforcement The content of mode, suitably can change without departing from the range of its purport.

[embodiment]

Then, enumerate embodiment, the present invention is specifically described.But, present invention is obviously not limited to following enforcement Example.

Fig. 5～Fig. 8 is the explanatory diagram illustrating the processing conditions in embodiments of the invention 1～embodiment 15.Additionally, Fig. 9 It it is the explanatory diagram illustrating the processing conditions in the comparative example 1 of the present invention～comparative example 2.

In embodiment 1, to by FCD1 (HOYA Corp.'s manufacture, the nd=as difficulty processing glass material 1.49700, vd=81.61) the punching press product that formed carry out grinding, thus produce optic diameter 35.8mm, surface curvature The optical glass lens (spherical lens) of radius 44.72mm.By thick grinding process and a fine ginding operation mill after reunification Cut in operation, carried out grinding by performing ELID operation in the execution of CG manufacturing procedure.Use cup diameter 40mm, The cup-shaped abrasive material 3 of abrasive grain #2000, when making rotary shaft tilt alpha=14 ° of cup-shaped abrasive material 3, with as described below Processing conditions carried out CG manufacturing procedure.That is, if the rotating speed of cup-shaped abrasive material 3 is 20000rpm, feed speed is 2 μm/sec. It addition, setting the rotating speed of turntable 2 as the applying voltage of 50rpm, voltage application portion 6 is 150V.Additionally, as grinding fluid supply unit 5 The electric conductivity grinding fluid provided, employs シミロ Application CG-7 (manufacture of chemical industry Co., Ltd. of Datong District).

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.18 μm.Additionally, process time when cutting output is set to 80 μm is 50 Second.

In example 2, the rotating speed of cup-shaped abrasive material 3 is different from the situation of above-described embodiment 1 with feed speed.In embodiment In 2, if the rotating speed of cup-shaped abrasive material 3 be 30000rpm, feed speed be 5 μm/sec.The situation phase of other conditions and embodiment 1 With.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.20 μm.Additionally, process time when cutting output is set to 80 μm is 25 Second.

In embodiment 3, the feed speed of cup-shaped abrasive material 3 is different from the situation of above-described embodiment 1.In embodiment 3, if The feed speed of cup-shaped abrasive material 3 is 1 μm/sec.Other conditions are identical with the situation of embodiment 1.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.60 μm.Additionally, process time when cutting output is set to 80 μm is 90 Second.

In example 4, the feed speed of cup-shaped abrasive material 3 is different from the situation of above-described embodiment 1 with abrasive grain number.? In embodiment 4, if the feed speed of cup-shaped abrasive material 3 be 10 μm/sec, abrasive grain number be #1500.Other conditions and embodiment 1 Situation identical.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.22 μm.Additionally, process time when cutting output is set to 80 μm is 20 Second.

In embodiment 5, the feed speed of cup-shaped abrasive material 3 is different from the situation of above-described embodiment 4.In embodiment 5, if The feed speed of cup-shaped abrasive material 3 is 15 μm/sec.Other conditions are identical with the situation of embodiment 4.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.27 μm.Additionally, process time when cutting output is set to 80 μm is 20 Second.

In embodiment 6, the situation of the feed speed of cup-shaped abrasive material 3 and the material of binding material and above-described embodiment 4 is not With.In embodiment 6, the feed speed of cup-shaped abrasive material 3 being set to 2 μm/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 having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.16 μm.Additionally, process time when cutting output is set to 80 μm is 50 Second.

In embodiment 7, the rotating speed of cup-shaped abrasive material 3 is different from the situation of above-described embodiment 3.In embodiment 7, if cup-shaped The rotating speed of abrasive material 3 is 18000rpm.Other conditions are identical with the situation of embodiment 3.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.87 μm.Additionally, process time when cutting output is set to 80 μm is 90 Second.

In embodiment 8, the difficult kind of processing glass material and the feed speed of cup-shaped abrasive material 3 and above-described embodiment 4 Situation is different.In embodiment 8, if grinding object is E-FDS1 (HOYA Corp.'s manufacture, nd=1.92286, vd= 20.88), the feed speed of cup-shaped abrasive material 3 is 5 μm/sec.Other conditions are identical with the situation of embodiment 4.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.08 μm.Additionally, process time when cutting output is set to 80 μm is 25 Second.

In embodiment 9, the kind of difficult processing glass material is different from the situation of above-described embodiment 8.In embodiment 9, If grinding object is FDS18 (HOYA Corp.'s manufacture, nd=1.94595, vd=17.98).Other conditions and embodiment 8 Situation identical.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.05 μm.Additionally, process time when cutting output is set to 80 μm is 25 Second.

In embodiment 10, the kind of difficult processing glass material is different from the situation of above-described embodiment 8.In embodiment 10 In, if grinding object is FDS90 (HOYA Corp.'s manufacture, nd=1.84666, vd=23.78).Other conditions and enforcement The situation of example 8 is identical.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.50 μm.Additionally, process time when cutting output is set to 80 μm is 25 Second.

In embodiment 11, the difficult kind of processing glass material and the feed speed of cup-shaped abrasive material 3 and above-described embodiment 8 Situation is different.In embodiment 11, if grinding object is PCD4 (HOYA Corp.'s manufacture, nd=1.61800, vd= 63.40), the feed speed of cup-shaped abrasive material 3 is 4 μm/sec.Other conditions are identical with the situation of embodiment 8.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.56 μm.Additionally, process time when cutting output is set to 80 μm is 30 Second.

In embodiment 12, the feed speed of cup-shaped abrasive material 3 is different from the situation of above-described embodiment 11 with abrasive grain number. In embodiment 12, if the feed speed of cup-shaped abrasive material 3 be 3 μm/sec, abrasive grain number be #2000.Other conditions and enforcement The situation of example 11 is identical.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.30 μm.Additionally, process time when cutting output is set to 80 μm is 40 Second.

In embodiment 13, the difficult kind of processing glass material and the feed speed of cup-shaped abrasive material 3 and above-described embodiment 8 Situation is different.In embodiment 13, if grinding object is TAFD25 (HOYA Corp.'s manufacture, nd=1.90366, vd= 31.32), the feed speed of cup-shaped abrasive material 3 is 8 μm/sec.Other conditions are identical with the situation of embodiment 8.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.40 μm.Additionally, process time when cutting output is set to 80 μm is 20 Second.

In embodiment 14, the kind of difficult processing glass material is different from the situation of above-described embodiment 13.In embodiment 14 In, if grinding object is TAFD35 (HOYA Corp.'s manufacture, nd=1.91082, vd=35.25).Other conditions and reality The situation executing example 13 is identical.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.19 μm.Additionally, process time when cutting output is set to 80 μm is 20 Second.

In embodiment 15, the kind of difficult processing glass material is different from the situation of above-described embodiment 13.In embodiment 15 In, if grinding object is TAFD40 (HOYA Corp.'s manufacture, nd=2.00069, vd=25.46).Other conditions and reality The situation executing example 13 is identical.

The result having carried out grinding according to above processing conditions is, being formed by difficulty processing glass material after processing Surface roughness Rz of lens surface of eyeglass be 0.49 μm.Additionally, process time when cutting output is set to 80 μm is 20 Second.

In comparative example 1, different from the situation of above-described embodiment 1～15, carry out thick grinding and fine ginding processing The grinding in the two stage.In thick grinding, if the feed speed of cup-shaped abrasive material 3 is 20 μm/sec, abrasive grain Number it is #325.On the other hand, in fine ginding is processed, if the feed speed of cup-shaped abrasive material 3 is 10 μm/sec, abrasive grain number For #1500.The rotating speed of cup-shaped abrasive material 3 is all set to 6000rpm in any one party that thick grinding and fine ginding are processed.Separately Outward, if the rotating speed of turntable 2 be 50rpm, the applying voltage of voltage application portion 6 be 0V (the most not performing ELID operation).Additionally, conduct Electric conductivity grinding fluid, employs シミロ Application CG-7 (manufacture of chemical industry Co., Ltd. of Datong District).

The result having carried out grinding according to above processing conditions is, after thick grinding by difficulty process glass material Surface roughness Rz of the lens surface of the eyeglass that material is formed is 15.0 μm.Thick grinding when cutting output is set to 80 μm Process time is 15 seconds.Additionally, the surface of the lens surface being processed the eyeglass that glass material is formed by difficulty after fine ginding processing Roughness Rz is 1.0 μm.The process time of thick grinding when cutting output is set to 80 μm is 18 seconds.

In comparative example 2, the rotating speed of cup-shaped abrasive material 3 is different from the situation of above-mentioned comparative example 1.In comparative example 2, if cup-shaped The rotating speed of abrasive material 3 is 15000rpm.Other conditions are identical with the situation of comparative example 1.

The result having carried out grinding according to above processing conditions is, after thick grinding by difficulty process glass material Surface roughness Rz of the lens surface of the eyeglass that material is formed is 13.5 μm.Thick grinding when cutting output is set to 80 μm Process time is 15 seconds.Additionally, the surface of the lens surface being processed the eyeglass that glass material is formed by difficulty after fine ginding processing Roughness Rz is 1.0～2.0 μm.Why create the 1.0～2.0 such deviations of μm, owing to existing because of cup-shaped abrasive material 3 The roughness deviation that burr state causes.The process time of thick grinding when cutting output is set to 80 μm is 18 seconds.

Investigate embodiment listed above 1～15 and the result of comparative example 1～2 understand, process glass material for by difficulty Constitute glass forming body thick grinding before be ground face, directly carrying out essence without thick grinding process (S6a) In the case of grinding process (S6b), in order to make surface roughness Rz of machined surface become below 1 μm after grinding, about To the processing conditions of glass forming body formed by difficulty processing glass material, as long as setting the rotating speed of cup-shaped abrasive material 3 as 18000rpm ～30000rpm, feed speed are 1.0 μm/more than sec and the grain size number of 15.0 μm/below sec, abrasive particle is #2000～# 8000, the mean diameter of abrasive particle is 1.0 μm～10.0 μm, to apply voltage be 30V～150V, binding material is metal adhesive or In resinoid bond any one, the rotating speed of turntable be 1rpm～100rpm.

Claims

1. the grinding processing method of an optical glass, it is characterised in that this grinding processing method includes following operation:

Grinding process, makes the electric conductivity cup-shaped in the grinding face with fine ginding processing that granularity is #1500～#8000 of abrasive particle Abrasive material, is connected to by as being ground before the difficult thick grinding processing the glass forming body that glass material is constituted of optical glass Bevel, and carry out this cup-shaped abrasive material rotating driving, thus cut without corase grind and carry out fine ginding；And

Electrolytic in-process dressing operation, this electrolytic in-process dressing operation is when carrying out described grinding process, to being disposed in described Electric conductivity grinding fluid is provided, simultaneously to institute between electrode and the described cup-shaped abrasive material of the position that the grinding face of cup-shaped abrasive material is relative State the DC pulse applied between electrode and described cup-shaped abrasive material with described electrode as negative electrode and with described cup-shaped abrasive material as anode Voltage, thus carries out the dressing in described grinding face,

Use described cup-shaped abrasive material, carry out the grinding of described glass forming body merely with the described grinding process in a stage.

The grinding processing method of optical glass the most according to claim 1, it is characterised in that

Described difficult processing glass material by fluophosphate glass, phosphoric acid glass, high index of refraction high-dispersion glass containing niobium phosphate or Person contains any one composition in the high-refractivity and low-dispersion glass of lanthanum borate.

The grinding processing method of optical glass the most according to claim 1 and 2, it is characterised in that

Described cup-shaped abrasive material comprises and is ground the abrasive particle that face carries out grinding and the binding material combined by this abrasive particle to described,

The granularity of described abrasive particle is #2000～#8000.

The grinding processing method of optical glass the most according to claim 3, it is characterised in that

The mean diameter of described abrasive particle is 1.0 μm～10.0 μm.

The rotating speed of the described cup-shaped abrasive material in described grinding process is more than 18000rpm and below 30000rpm.

Described glass forming body in described grinding process with described cup-shaped abrasive material in the phase para-position abutted on pressure direction-changeable Putting the feed speed of movement is the 1.0 μm/more than second and 15.0 μm/below the second.

Described binding material is made up of metal adhesive or resinoid bond.

8. a manufacture method for optical glass lens, this manufacture method uses the light in claim 1～7 described in any one Learn the grinding processing method of glass, manufacture optical glass lens based on described glass forming body.