JP3530562B2 - Lens grinding method - Google Patents
Lens grinding methodInfo
- Publication number
- JP3530562B2 JP3530562B2 JP35220093A JP35220093A JP3530562B2 JP 3530562 B2 JP3530562 B2 JP 3530562B2 JP 35220093 A JP35220093 A JP 35220093A JP 35220093 A JP35220093 A JP 35220093A JP 3530562 B2 JP3530562 B2 JP 3530562B2
- Authority
- JP
- Japan
- Prior art keywords
- grinding
- conductive
- lens
- electrode
- grinding wheel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、レンズの研削砥石によ
る球面創成加工に関し、特に電解ドレッシングを応用し
た球面創成加工法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical surface forming process using a grinding wheel for a lens, and more particularly to a spherical surface forming process method to which electrolytic dressing is applied.
【０００２】[0002]
【従来の技術】従来、電解ドレッシングによるレンズ球
面創成加工として、例えば特開平３−６０９７３号公報
記載の発明が提案されている。上記発明は、図９および
図１０に示す様に、回転自在に構成されたチャック６１
には被球面部材６２が保持されている。被球面部材６２
にはその軸芯６３に対してスイベル角αの導電性研削工
具６４が回転自在に対向保持されている。導電性研削工
具６４の研削面６５は、ダイヤモンド粉末などの砥粒と
Ｃｕ，Ｓｎ，Ｆｅなどの金属粉末とを特殊配合し、熱処
理した焼結合金により構成されている。2. Description of the Related Art Conventionally, as a lens spherical surface forming process by electrolytic dressing, for example, an invention described in Japanese Patent Application Laid-Open No. 3-60973 has been proposed. The above-described invention is, as shown in FIGS. 9 and 10, a chuck 61 configured to be rotatable.
A spherical member 62 is held by. Spherical member 62
A conductive grinding tool 64 having a swivel angle α is rotatably opposed to and held by the shaft center 63. The grinding surface 65 of the conductive grinding tool 64 is made of a sintered alloy obtained by specially blending abrasive grains such as diamond powder and metal powder such as Cu, Sn and Fe, and heat-treating.
【０００３】導電性研削工具６４の研削面６５近傍に
は、被球面部材６２の加工曲率ＲＡと近似形状に形成さ
れた電極６６が僅かな隙間ｌを在して対向設置されてい
る。電極６６は直流電源装置６７の（−）極と接続され
ている。直流電源装置６７の（＋）極は導電性研削工具
６４の外周面に接触するブラシ６８に接続されている。
また、導電性研削工具６４の研削面６５と電極６６との
僅かな隙間ｌにクーラント６９を供給するノズル７０が
設けられている。In the vicinity of the grinding surface 65 of the conductive grinding tool 64, an electrode 66 formed in a shape similar to the processing curvature RA of the spherical surface member 62 is installed oppositely with a slight gap l. The electrode 66 is connected to the (-) pole of the DC power supply device 67. The (+) pole of the DC power supply device 67 is connected to the brush 68 that contacts the outer peripheral surface of the conductive grinding tool 64.
Further, a nozzle 70 for supplying the coolant 69 is provided in a slight gap 1 between the grinding surface 65 of the conductive grinding tool 64 and the electrode 66.
【０００４】上記構成の装置を用いての球面創成加工方
法は、まず被球面部材６２を保持したチャック６１を回
動するとともに、導電性研削工具６４を回動し、研削面
６５を被球面部材６２の被研削面に当接して研削加工を
行う。同時に、直流電源装置６７よりブラシ６８を介し
て導電性研削加工具６４に（＋）極を印加し、電極６６
に（−）極を印加する。さらに、ノズル７０よりクーラ
ント６９を供給しつつ研削加工行う。以上により、導電
性研削工具６４の研削面６５は満遍無く均一にドレッシ
ングされ、安定した球面創成加工が行える。In the spherical surface generating method using the apparatus having the above structure, first, the chuck 61 holding the spherical member 62 is rotated, the conductive grinding tool 64 is rotated, and the grinding surface 65 is changed to the spherical member. Grinding is performed by contacting the surface to be ground 62. At the same time, the (+) pole is applied from the DC power supply device 67 to the conductive grinding tool 64 via the brush 68, and the electrode 66
The (-) pole is applied to. Further, grinding is performed while supplying the coolant 69 from the nozzle 70. As described above, the grinding surface 65 of the conductive grinding tool 64 is evenly and uniformly dressed, and stable spherical surface creation processing can be performed.
【０００５】[0005]
【発明が解決しようとする課題】しかるに、前記従来技
術の電解ドレッシングにおいては、加工によって生じる
研削工具の偏磨耗と目詰りを防止することが主体であ
り、研削工具中の砥粒の突出量を制御することができな
かった。従って、１つの砥石で粗研削と仕上研削とを行
い、効率良くレンズを研削することができないという問
題があった。However, in the above-mentioned electrolytic dressing of the prior art, the main purpose is to prevent uneven wear and clogging of the grinding tool caused by working, and to prevent the amount of protrusion of abrasive grains in the grinding tool. I couldn't control it. Therefore, there is a problem that it is not possible to efficiently grind the lens by performing rough grinding and finish grinding with one grindstone.
【０００６】因って、本発明は前記従来技術における問
題点に鑑みてなされたものであり、１つの砥石で効率良
くレンズを加工できるレンズ研削方法を提供することを
目的とする。Therefore, the present invention has been made in view of the above problems in the prior art, and an object thereof is to provide a lens grinding method capable of efficiently processing a lens with one grindstone.
【０００７】[0007]
【課題を解決するための手段】第１の発明に係るレンズ
研削方法は、砥粒と導電性のボンド材とを有する導電性
研削砥石の研削面と電極との間に弱電性研削液を供給し
ながら、前記導電性研削砥石でレンズを研削加工するレ
ンズ研削方法において、前記導電性研削砥石にプラス
を、電極にマイナスの直流パルス電圧を印加することに
より、前記ボンド材を放電作用によって除去しつつ前記
レンズを粗研削する工程と、前記導電性研削砥石にプラ
スを、電極にマイナスの直流定常電圧を印加することに
より、前記研削面上にボンド材の電解作用によって発生
する不導体被膜を形成しつつ前記レンズを仕上研削する
工程と、を有する。また、第２の発明に係るレンズ研削
方法は、砥粒と導電性のボンド材とを有する導電性研削
砥石の研削面と電極との間に弱電性研削液を供給しなが
ら、前記導電性研削砥石でレンズを研削加工するレンズ
研削方法において、前記導電性研削砥石にプラスを、電
極にマイナスの直流パルス電圧を印加することにより、
前記ボンド材を放電作用によって除去しつつ前記レンズ
を粗研削する工程と、前記導電性研削砥石にマイナス
を、電極にプラスの直流定常電圧を印加することによ
り、電極の電解作用によって、電極を構成する金属を前
記研削面上に析出させることにより被膜を形成しつつ前
記レンズを仕上研削する工程と、を有する。According to a first aspect of the present invention, there is provided a lens grinding method in which a weakly electric grinding liquid is supplied between a ground surface of a conductive grinding wheel having abrasive grains and a conductive bonding material and an electrode. However, in the lens grinding method of grinding a lens with the conductive grinding wheel, by applying a positive DC pulse voltage to the conductive grinding wheel with a positive DC voltage, the bond material is removed by a discharge action. While rough grinding the lens and applying a positive DC steady voltage to the conductive grinding wheel and a negative DC steady voltage to the electrodes, the electrolytic action of the bond material on the ground surface
A step of finish grinding the lens while forming a non-conductive coating. In the lens grinding method according to the second invention, the conductive grinding is performed while supplying a weakly electric grinding liquid between a ground surface of a conductive grinding wheel having abrasive grains and a conductive bond material and an electrode. In the lens grinding method of grinding a lens with a grindstone, by applying a positive DC pulse voltage to the electrodes, plus to the conductive grinding wheel,
A step of roughly grinding the lens while removing the bond material by an electric discharge action, and applying a negative DC voltage to the conductive grinding wheel and a positive DC steady voltage to the electrode to form the electrode by the electrolytic action of the electrode. Metal in front
And a step of finish grinding the lens while forming a film by depositing on the ground surface .
【０００８】[0008]
【実施例１】まず、本発明の具体的な実施例を説明する
前に、本発明の概要を説明する。図１〜図４は本発明を
示す概念図である。本発明の加工方法は、既存の球面創
成機（以下、ＣＧ機という）を使用するものであり、導
電性研削砥石の研削面と電極との近傍を主体に説明す
る。ノズル６よりクーラント（弱電性研削液）７を供給
しつつレンズ（図示省略）を装填したチャック（図示省
略）を回転させるとともに、導電性研削砥石４を回転さ
せ、その端部に形成した研削面４ａをレンズの加工面に
当接して研削加工を行う。この加工と同時に、電源装置
（図示省略）より導電性研削砥石４をプラスとし、電極
５をマイナスとして、１４０Ｖ，１０Ａ以上の直流パル
ス電圧を印加し、前記両者の間に放電を起こさせる。こ
の放電により、図１に示す様に、鉄系ボンド２１が除去
され、研削面４ａからのダイヤモンド砥粒２０の突出量
ｌが大きくなる。加工前半はこの状態を維持して粗研削
を行う。次に、導電性研削砥石４および電極５に印加す
る極性をそのままに、６０Ｖ，３Ａの直流定常電圧に変
更する。あるいは、導電性研削砥石４をマイナスとし、
電極５をプラスとして、６０Ｖ，３Ａの直流定常電圧を
印加する。すると、図２に示す様に、研削面４ａに被膜
２３が形成され、研削面４ａからのダイヤモンド砥粒２
０の突出量ｌ′が小さくなる。加工後半でこの状態を維
持して仕上研削を行う。仕上研削終了後、スパークアウ
トを行い研削加工を終了する。Example 1 First, an outline of the present invention will be described before describing specific examples of the present invention. 1 to 4 are conceptual diagrams showing the present invention. The processing method of the present invention uses an existing spherical surface creating machine (hereinafter referred to as a CG machine), and the description will be given mainly on the vicinity of the grinding surface of the conductive grinding wheel and the electrode. A coolant (weakly-electrolytic grinding fluid) 7 is supplied from a nozzle 6 and a chuck (not shown) loaded with a lens (not shown) is rotated, and a conductive grinding wheel 4 is also rotated to form a grinding surface at an end thereof. Grinding is performed by bringing 4a into contact with the processed surface of the lens. Simultaneously with this processing, a DC pulse voltage of 140 V, 10 A or higher is applied by using a conductive grinding wheel 4 as a plus and an electrode 5 as a minus from a power supply device (not shown), and a discharge is generated between the two. By this discharge, as shown in FIG. 1, the iron-based bond 21 is removed, and the protrusion amount l of the diamond abrasive grains 20 from the grinding surface 4a increases. In the first half of processing, this state is maintained and rough grinding is performed. Next, the polarity applied to the conductive grinding wheel 4 and the electrode 5 is changed to the DC steady voltage of 60 V and 3 A with the same polarity. Alternatively, the conductive grinding wheel 4 is set to a minus,
A constant DC voltage of 60 V, 3 A is applied with the electrode 5 as a plus. Then, as shown in FIG. 2, the coating film 23 is formed on the grinding surface 4a, and the diamond abrasive grains 2 from the grinding surface 4a are formed.
The protrusion amount l ′ of 0 becomes small. In the latter half of processing, this state is maintained and finish grinding is performed. After finishing grinding, spark out is performed to finish the grinding process.
【０００９】前記導電性研削砥石４をプラスとし、電極
５をマイナスとして、１４０Ｖ，１０Ａ以上の直流パル
ス電圧を印加すると、導電性研削砥石４の鉄系ボンド２
１と電極５との間に放電が起こる。すると、放電による
熱衝撃により鉄系ボンド２１が除去され、研削面４ａか
らのダイヤモンド砥粒２０の突出量ｌが大きくなり、レ
ンズに対する切込みが大きく効率的に加工ができる（図
１参照）。When the conductive grinding wheel 4 is positive and the electrode 5 is negative and a DC pulse voltage of 140 V and 10 A or more is applied, the iron-based bond 2 of the conductive grinding wheel 4 is applied.
A discharge occurs between 1 and the electrode 5. Then, the iron-based bond 21 is removed by the thermal shock caused by the discharge, the protrusion amount l of the diamond abrasive grains 20 from the ground surface 4a increases, and the notch for the lens is large, so that the lens can be efficiently processed (see FIG. 1).
【００１０】一方、導電性研削砥石４をプラスとし、電
極５をマイナスとして、６０Ｖ，３Ａの直流定常電圧を
印加すると、導電性研削砥石４を（＋）電極，電極５を
（−）電極とする電解作用により、鉄系ボンド２１がイ
オン化（Ｆｅ ３＋ ）して溶出すると同時に、鉄系ボンド
２１表面の酸化作用により導電性砥石４表面に酸化鉄
（Ｆｅ ２ Ｏ ３ ）による不導体被膜層が形成される（図３
参照）。従って、研削面４ａからのダイヤモンド砥粒２
０の突出量１’が小さくなり、レンズに対する切込み量
が小さく、クラックの小さい加工ができる。On the other hand, when the conductive grinding wheel 4 is positive and the electrode 5 is negative and a DC steady voltage of 60 V and 3 A is applied, the conductive grinding wheel 4 is applied to the (+) electrode and the electrode 5.
The iron-based bond 21 is removed by the electrolytic action of the (-) electrode.
It turns on (Fe 3+ ) and elutes, and at the same time, an iron-based bond
21 Iron oxide on the surface of the conductive grindstone 4 due to the oxidation of the surface
A non-conductive coating layer of (Fe 2 O 3 ) is formed (Fig. 3
reference). Therefore, the diamond abrasive grains 2 from the grinding surface 4a
The protrusion amount 1 ′ of 0 is small, the amount of cut into the lens is small, and processing with small cracks can be performed.
【００１１】また、導電性研削砥石４をマイナスとし、
銅（Ｃｕ）製の電極５をプラスとして、６０Ｖ，３Ａの
直流定常電圧を印加すると、導電性研削砥石４を（−）
電極，電極５を（＋）電極とする電解作用により、電極
５を構成している金属がイオン化溶出し、導電性研削砥
石４の研削面４ａに金属銅として析出し、研削面４ａの
表面に被膜２３を形成する（図４参照）。従って、研削
面４ａからのダイヤモンド砥粒２０の突出量１’が小さ
くなり、レンズに対する切込み量が小さく、クラックの
小さい加工ができる。Further, the conductive grinding wheel 4 is set to a negative value,
When the direct current voltage of 60 V and 3 A is applied with the electrode 5 made of copper (Cu) as a plus, the conductive grinding wheel 4 is (-)
Electrodes by using the electrode and electrode 5 as (+) electrodes
The metal composing No. 5 is ionized and eluted, and conductive grinding
Precipitated as metallic copper on the ground surface 4a of the stone 4,
A film 23 is formed on the surface (see FIG. 4). Therefore, the amount of protrusion 1'of the diamond abrasive grains 20 from the grinding surface 4a is small, the amount of cut into the lens is small, and processing with small cracks can be performed.
【００１２】次に、本発明の具体的な実施例を図に基づ
いて説明する。図５および図６は本実施例で用いる装置
を示し、図５は要部の概略構成図、図６は電源装置の概
略回路図である。なお、本実施例では図１および図３を
併用して説明する。ＣＧ機（図示省略）のワーク軸３先
端に設けられたチャック２にはレンズ１が保持されてい
る。レンズ１はワーク軸３により回転可能かつ進退可能
に保持されている。Next, a concrete embodiment of the present invention will be described with reference to the drawings. 5 and 6 show an apparatus used in this embodiment, FIG. 5 is a schematic configuration diagram of a main part, and FIG. 6 is a schematic circuit diagram of a power supply apparatus. It should be noted that this embodiment will be described with reference to FIGS. A lens 1 is held on a chuck 2 provided at the tip of a work shaft 3 of a CG machine (not shown). The lens 1 is held by a work shaft 3 so as to be rotatable and movable back and forth.
【００１３】４はＧＣ機の砥石軸（図示省略）に固定さ
れた導電性研削砥石で、この導電性研削砥石４は砥石軸
により回転可能かつワーク軸３の軸線に対して角度揺動
可能に保持されている。導電性研削砥石４は、メッシュ
＃３２５のダイヤモンド砥粒２０を鉄系ボンド２１で固
定したものである。導電性研削砥石４の研削面４ａには
研削面４ａと０．１ｍｍの間隔を介して炭素製の電極５
が設置されている。Reference numeral 4 is a conductive grinding wheel fixed to a grindstone shaft (not shown) of the GC machine. The conductive grinding grindstone 4 is rotatable by the grindstone shaft and is capable of swinging angularly with respect to the axis of the work shaft 3. Is held. The electroconductive grinding wheel 4 is obtained by fixing the diamond abrasive grains 20 of mesh # 325 with an iron-based bond 21. A carbon electrode 5 is formed on the ground surface 4a of the conductive grinding wheel 4 with a distance of 0.1 mm from the ground surface 4a.
Is installed.
【００１４】導電性研削砥石４の外周面には炭素製の給
電ブラシ８が接触配置されている。電極５および給電ブ
ラシ８は電源装置９のそれぞれマイナス極およびプラス
極に接続され、電圧を印加できる様に構成されている。
電源装置９には、印加電圧を調整する電圧調整ボタン３
０と、印加する電圧を定常あるいはパルスに切り換える
定常・パルス切換スイッチ３１が備えられている。６は
ノズルで、クーラント７を加工域に供給するものであ
る。クーラント７としては、電解用の弱電性研削液を使
用した。A carbon power feeding brush 8 is disposed in contact with the outer peripheral surface of the conductive grinding wheel 4. The electrode 5 and the power feeding brush 8 are connected to the negative pole and the positive pole of the power supply device 9, respectively, and are configured to be able to apply a voltage.
The power supply device 9 has a voltage adjustment button 3 for adjusting the applied voltage.
0 and a steady / pulse switch 31 for switching the applied voltage to steady or pulse. A nozzle 6 supplies the coolant 7 to the processing area. As the coolant 7, a weakly electric grinding liquid for electrolysis was used.
【００１５】以上の構成から成る装置を用い、本実施例
では径φ２０，曲率半径３５ｍｍ，材質ＬＡＨ６６のレ
ンズの球面加工を行った。レンズ１をチャック２に装填
する。次に、クーラント７を供給するとともに、導電性
研削砥石４を１４，０００ｒｐｍで回転させ、同時に電
源装置９の電圧調整ボタン３０を１４０Ｖに、定常・パ
ルス切換スイッチ３１をパルスにセットし、電極５およ
び導電性研削砥石４に１４０Ｖの直流パルス電圧をピー
ク電流１０Ａとなるように設定する。すると電極５と導
電性研削砥石４の鉄系ボンド２１との間で放電が起こ
り、鉄系ボンド２１が除去される。In the present embodiment, a spherical lens having a diameter of 20, a radius of curvature of 35 mm and a material of LAH66 was machined by using the apparatus having the above construction. The lens 1 is loaded on the chuck 2. Next, while supplying the coolant 7, the electroconductive grinding wheel 4 is rotated at 14,000 rpm, and at the same time, the voltage adjustment button 30 of the power supply device 9 is set to 140V and the steady / pulse changeover switch 31 is set to pulse to set the electrode 5 Further, a DC pulse voltage of 140 V is set on the conductive grinding wheel 4 so that the peak current is 10 A. Then, electric discharge occurs between the electrode 5 and the iron-based bond 21 of the conductive grinding wheel 4, and the iron-based bond 21 is removed.
【００１６】鉄系ボンド２１が積極的に除去されること
により、ダイヤモンド砥粒２０の突出量ｌが０．０２５
ｍｍ以上に保たれる（図１参照）。レンズ１を装填した
チャック２を４００ｒｐｍで回転させるとともに導電性
研削砥石４をレンズ１の加工面に対して切込んでいく。
総切込み量０．６ｍｍのうち０．４ｍｍまではこの状態
で切込み、粗研削を行う。続いて、電源装置９の電圧調
整ボタン３０を６０Ｖに、定常・パルス切換スイッチ３
１を定常にセットし、電極５と導電性研削砥石４とに印
加する電圧を直流定常電圧６０Ｖ、ピーク電流を３Ａに
設定し直す。By positively removing the iron-based bond 21, the protrusion amount l of the diamond abrasive grain 20 is 0.025.
mm or more (see FIG. 1). The chuck 2 loaded with the lens 1 is rotated at 400 rpm, and the conductive grinding wheel 4 is cut into the processed surface of the lens 1.
Cutting is performed in this state up to 0.4 mm out of the total cutting depth of 0.6 mm, and rough grinding is performed. Then, the voltage adjustment button 30 of the power supply device 9 is set to 60V, and the steady / pulse changeover switch 3
1 is set to a steady state, the voltage applied to the electrode 5 and the conductive grinding wheel 4 is set to a DC steady state voltage of 60 V, and the peak current is set to 3 A.
【００１７】すると、鉄系ボンド２１のＦｅ3+イオンと
クーラント７中のＯ2-イオンとが化合して導電性研削砥
石４の研削面４ａに被膜（Ｆｅ2 Ｏ3 ）２３が形成され
る（図３参照）。この被膜２３が形成されることによ
り、ダイヤモンド砥粒２０の突出量ｌ′が０．０１ｍｍ
以下に保たれる。総切込み量の残り０．２ｍｍをこの状
態で切んで仕上研削を行う。切込み終了後、５秒間スパ
ークアウトを行う。Then, Fe 3+ ions in the iron-based bond 21 and O 2− ions in the coolant 7 combine to form a film (Fe 2 O 3 ) 23 on the ground surface 4a of the conductive grinding wheel 4. (See Figure 3). By forming the coating film 23, the protrusion amount l ′ of the diamond abrasive grains 20 is 0.01 mm.
Kept below. The remaining 0.2 mm of the total depth of cut is cut in this state and finish grinding is performed. After finishing the cut, spark out for 5 seconds.
【００１８】しかる後、導電性研削砥石４を元の位置に
戻すと同時に、チャック２と導電性研削砥石４との回転
を止め、クーラント７の供給も止めてレンズ１をチャッ
ク２から外す。以上により従来２種類の砥石を使って加
工していた研削工程を１つの砥石で従来と同様な３μｍ
Ｒｍａｘの面粗さに加工することができた。Thereafter, the conductive grinding wheel 4 is returned to its original position, and at the same time, the rotation of the chuck 2 and the conductive grinding wheel 4 is stopped, the supply of the coolant 7 is stopped, and the lens 1 is removed from the chuck 2. As a result, the grinding process, which used to be performed using two types of whetstones in the past, is 3 μm, which is the same as the conventional one with one whetstone.
It was possible to process to a surface roughness of Rmax.
【００１９】本実施例によれば、１つの砥石で粗研削と
仕上げ研削ができ、効率良くレンズを加工できる。According to this embodiment, rough grinding and finish grinding can be performed with one grindstone, and the lens can be efficiently processed.
【００２０】[0020]
【実施例２】図７および図８は本実施例で用いる装置を
示し、図７は要部の概略構成図、図８は電源装置の概略
回路図である。なお、本実施例では図１および図４を併
用して説明する。本実施例は、前記実施例１における炭
素製の電極５を銅（Ｃｕ）製の電極５にした点と、電極
５および給電ブラシ８と電源装置９との間に切換装置１
０を設けて構成した点が異なり、他の構成は同一な構成
部分から成るもので、同一構成部分には同一番号を付し
てその説明を省略する。切換装置１０の切換スイッチ１
０ａは、電極５と給電ブラシ８の極をプラス・マイナス
に切換えるものである。[Embodiment 2] FIGS. 7 and 8 show an apparatus used in this embodiment, FIG. 7 is a schematic configuration diagram of a main portion, and FIG. 8 is a schematic circuit diagram of a power supply apparatus. It should be noted that this embodiment will be described with reference to FIGS. In this embodiment, the switching device 1 is provided between the electrode 5 and the power supply brush 8 and the power supply device 9 in that the carbon electrode 5 in the first embodiment is replaced with a copper (Cu) electrode 5.
The difference is that it is configured by providing 0, and other configurations are composed of the same constituent parts, and the same constituent parts are designated by the same reference numerals and the description thereof is omitted. Changeover switch 1 of changeover device 10
0a is for switching the electrode 5 and the pole of the power feeding brush 8 between plus and minus.
【００２１】以上の構成から成る装置を用い、本実施例
では径φ２０，曲率半径３５ｍｍ，材質ＬａＳＦＯ１６
のレンズの球面加工を行った。レンズ１をチャック２に
装填する。次に、クーラント７を供給するとともに導電
性研削砥石４を１４，０００ｒｐｍで回転させ、同時に
電源装置９の電圧調整ボタン３０を１４０Ｖに、定常・
パルス切換スイッチ３１をパルスにセットする。さら
に、切換装置１０の切換スイッチ１０ａにより電極５を
マイナス極に、給電ブラシ８をプラス極にし、電極５お
よび導電性研削砥石４に１４０Ｖの直流パルス電圧をピ
ーク電流１０Ａとなるように設定する。すると、電極５
と導電性研削砥石４の鉄系ボンド２１との間で放電が起
こり、鉄系ボンド２１が除去される。Using the apparatus having the above structure, in this embodiment, the diameter is φ20, the radius of curvature is 35 mm, and the material is LaSFO16.
The lens was spherically processed. The lens 1 is loaded on the chuck 2. Next, the coolant 7 is supplied and the electroconductive grinding wheel 4 is rotated at 14,000 rpm, and at the same time, the voltage adjustment button 30 of the power supply device 9 is set to 140V so that
The pulse changeover switch 31 is set to pulse. Furthermore, the changeover switch 10a of the changeover device 10 sets the electrode 5 to the negative pole and the feed brush 8 to the positive pole, and sets a DC pulse voltage of 140 V to the peak current 10A for the electrode 5 and the conductive grinding wheel 4. Then, electrode 5
Electric discharge occurs between the iron-based bond 21 of the conductive grinding wheel 4 and the iron-based bond 21 is removed.
【００２２】鉄系ボンドが積極的に除去されることによ
り、ダイヤモンド砥粒２０の突出量ｌが０．０２５ｍｍ
以上に保たれる（図１参照）。レンズ１を装填したチャ
ック２を４００ｒｐｍで回転させるとともに導電性研削
砥石４をレンズ１の加工面に対して切込んでいく。総切
込み量０．６ｍｍのうち０．４ｍｍまではこの状態で切
込み、粗研削を行う。By positively removing the iron-based bond, the protrusion amount l of the diamond abrasive grains 20 is 0.025 mm.
The above is maintained (see FIG. 1). The chuck 2 loaded with the lens 1 is rotated at 400 rpm, and the conductive grinding wheel 4 is cut into the processed surface of the lens 1. Cutting is performed in this state up to 0.4 mm out of the total cutting depth of 0.6 mm, and rough grinding is performed.
【００２３】続いて、電源装置９の電圧調整ボタン３０
を６０Ｖに、定常・パルス切換スイッチ３１を定常にセ
ットし、さらに切換装置１０の切換スイッチ１０ａによ
り、電極５をマイナス極からプラス極に、給電ブラシ８
をプラス極からマイナス極に切換える。すると、導電性
研削砥石４を（−）電極、電極５を（＋）電極とする電
解作用により、電極５を構成している金属がイオン化溶
出し、導電性研削砥石４の研削面４ａに金属銅として析
出し、研削面４ａの表面に被覆２３を形成する（図４参
照）。 Next, the voltage adjustment button 30 of the power supply device 9
Is set to 60V and the steady / pulse changeover switch 31 is set to steady, and the changeover switch 10a of the changeover device 10 changes the electrode 5 from the negative pole to the positive pole to supply the power to the brush 8.
Switch from the positive pole to the negative pole. Then conductive
Electrode with grinding wheel 4 as (-) electrode and electrode 5 as (+) electrode
The metal composing the electrode 5 is ionized and dissolved by the desolving action.
Out and deposit as copper metal on the grinding surface 4a of the conductive grinding wheel 4.
Then, the coating 23 is formed on the surface of the ground surface 4a (see FIG. 4).
See).
【００２４】銅の被膜２３が形成されることにより、ダ
イヤモンド砥粒２０の突出量ｌ′が０．０１ｍｍ以下に
保たれる。総切込み量の残り０．２ｍｍをこの状態で切
込んで仕上研削を行う。切込み終了後、５秒間スパーク
アウトを行う。しかる後、導電性研削砥石４を元の位置
に戻すと同時にチャック２と導電性研削砥石４の回転を
止め、クーラント７の供給も止めてレンズ１をチャック
２から外す。以上により、従来２種類の砥石を使って加
工していた研削工程を、１つの砥石で従来と同様な３μ
ｍＲｍａｘの面粗さに加工することができた。By forming the copper coating 23, the protrusion amount l'of the diamond abrasive grains 20 is kept at 0.01 mm or less. The remaining 0.2 mm of the total depth of cut is cut in this state for finish grinding. After finishing the cut, spark out for 5 seconds. After that, the conductive grinding wheel 4 is returned to its original position, and at the same time, the rotation of the chuck 2 and the conductive grinding wheel 4 is stopped, the supply of the coolant 7 is stopped, and the lens 1 is removed from the chuck 2. Due to the above, the grinding process, which was conventionally performed using two types of grindstones, is 3μ
It was possible to process to a surface roughness of mRmax.
【００２５】本実施例によれば、前記実施例１と同様の
効果が得られ、さらに被膜の厚さを均一にでき、膜厚の
制御も容易であるという利点もある。According to this embodiment, the same effects as those of the first embodiment can be obtained, and the thickness of the film can be made uniform, and the film thickness can be easily controlled.
【００２６】[0026]
【発明の効果】以上説明した様に、本発明に係るレンズ
研削方法によれば、１つの砥石で粗研削と仕上げ研削と
ができ、効率良くレンズを加工できる。As described above, according to the lens grinding method of the present invention, rough grinding and finish grinding can be performed with one grindstone, and the lens can be efficiently processed.
【図１】本発明を示す概念図である。FIG. 1 is a conceptual diagram showing the present invention.
【図２】本発明を示す概念図である。FIG. 2 is a conceptual diagram showing the present invention.
【図３】本発明を示す概念図である。FIG. 3 is a conceptual diagram showing the present invention.
【図４】本発明を示す概念図である。FIG. 4 is a conceptual diagram showing the present invention.
【図５】実施例１を示す概略構成図である。FIG. 5 is a schematic configuration diagram showing a first embodiment.
【図６】実施例１を示す概略回路図である。FIG. 6 is a schematic circuit diagram showing a first embodiment.
【図７】実施例２を示す概略構成図である。FIG. 7 is a schematic configuration diagram showing a second embodiment.
【図８】実施例２を示す概略回路図である。FIG. 8 is a schematic circuit diagram showing a second embodiment.
【図９】従来例を示す概略構成図である。FIG. 9 is a schematic configuration diagram showing a conventional example.
【図１０】図９のＡ矢視図である。10 is a view on arrow A in FIG. 9. FIG.
１ レンズ ２ チャック ３ ワーク軸 ４ 導電性研削砥石 ５ 電極 ６ ノズル ７ クーラント ８ ブラシ ９ 電源装置 １０ 切換装置 ３０ 電圧調整ボタン ３１ 定常・パルス切換スイッチ 1 lens 2 chuck 3 Work axis 4 Conductive grinding wheel 5 electrodes 6 nozzles 7 coolant 8 brushes 9 power supply 10 Switching device 30 Voltage adjustment button 31 Steady / Pulse changeover switch
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−277939（ＪＰ，Ａ) 特開 平４−256575（ＪＰ，Ａ) 特開 平４−193477（ＪＰ，Ａ) 特開 平１−188266（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B24B 13/00 - 13/06 B24B 53/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-277939 (JP, A) JP-A-4-256575 (JP, A) JP-A-4-193477 (JP, A) JP-A-1- 188266 (JP, A) (58) Fields surveyed (Int.Cl. 7 , DB name) B24B 13/00-13/06 B24B 53/00
Claims (2)
性研削砥石の研削面と電極との間に弱電性研削液を供給
しながら、前記導電性研削砥石でレンズを研削加工する
レンズ研削方法において、 前記導電性研削砥石にプラスを、電極にマイナスの直流
パルス電圧を印加することにより、前記ボンド材を放電
作用によって除去しつつ前記レンズを粗研削する工程
と、 前記導電性研削砥石にプラスを、電極にマイナスの直流
定常電圧を印加することにより、前記研削面上にボンド
材の電解作用によって発生する不導体被膜を形成しつつ
前記レンズを仕上研削する工程と、 を有することを特徴とするレンズ研削方法。1. A lens for grinding a lens with a conductive grinding wheel while supplying a weakly electric grinding liquid between a ground surface of a conductive grinding wheel having abrasive grains and a conductive bond material and an electrode. In the grinding method, a positive DC voltage is applied to the conductive grinding wheel and a negative DC pulse voltage is applied to the electrodes to discharge the bond material.
A step of roughly grinding the lens while removing it by an action; a positive DC voltage is applied to the conductive grinding wheel and a negative DC steady voltage is applied to the electrode to bond the grinding surface.
And a step of finish-grinding the lens while forming a non-conductive coating film generated by the electrolytic action of the material .
性研削砥石の研削面と電極との間に弱電性研削液を供給
しながら、前記導電性研削砥石でレンズを研削加工する
レンズ研削方法において、 前記導電性研削砥石にプラスを、電極にマイナスの直流
パルス電圧を印加することにより、前記ボンド材を放電
作用によって除去しつつ前記レンズを粗研削する工程
と、 前記導電性研削砥石にマイナスを、電極にプラスの直流
定常電圧を印加することにより、電極の電解作用によっ
て、電極を構成する金属を前記研削面上に析出させるこ
とにより被膜を形成しつつ前記レンズを仕上研削する工
程と、 を有することを特徴とするレンズ研削方法。2. A lens for grinding a lens with the conductive grinding wheel while supplying a weakly electric grinding liquid between a grinding surface of a conductive grinding wheel having abrasive grains and a conductive bond material and an electrode. In the grinding method, a positive DC voltage is applied to the conductive grinding wheel and a negative DC pulse voltage is applied to the electrodes to discharge the bond material.
The step of roughly grinding the lens while removing it by the action, and by applying a negative DC voltage to the conductive grinding wheel and a positive DC steady voltage to the electrode, the electrolytic action of the electrode is performed.
The metal composing the electrode to deposit on the ground surface.
And a step of finish-grinding the lens while forming a coating film by the method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35220093A JP3530562B2 (en) | 1993-12-30 | 1993-12-30 | Lens grinding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35220093A JP3530562B2 (en) | 1993-12-30 | 1993-12-30 | Lens grinding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07205006A JPH07205006A (en) | 1995-08-08 |
| JP3530562B2 true JP3530562B2 (en) | 2004-05-24 |
Family
ID=18422456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35220093A Expired - Fee Related JP3530562B2 (en) | 1993-12-30 | 1993-12-30 | Lens grinding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3530562B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7129588B2 (en) | 2018-08-01 | 2022-09-02 | 和則 川島 | scale |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5453459B2 (en) * | 2010-01-29 | 2014-03-26 | 有限会社コジマエンジニアリング | Grinding method of lens spherical surface using dish-shaped grinding wheel |
| JP5916102B2 (en) * | 2011-03-24 | 2016-05-11 | Hoya株式会社 | Optical glass grinding method and optical glass lens manufacturing method |
| JP5916103B2 (en) * | 2011-03-24 | 2016-05-11 | Hoya株式会社 | Optical glass grinding method and optical glass lens manufacturing method |
| JP5916101B2 (en) * | 2011-03-24 | 2016-05-11 | Hoya株式会社 | Optical glass processing method and optical glass lens manufacturing method |
| CN102689254B (en) * | 2011-03-24 | 2016-12-14 | Hoya株式会社 | The grinding processing method of optical glass and the manufacture method of optical glass lens |
| CN111168173B (en) * | 2020-01-10 | 2021-05-14 | 安徽工业大学 | Positive flow type movable mould plate electrolytic grinding composite processing method and device |
| CN115846778B (en) * | 2022-12-07 | 2024-09-20 | 南京航空航天大学 | Discharge electrochemical-grinding sequential circulation composite processing method |
-
1993
- 1993-12-30 JP JP35220093A patent/JP3530562B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7129588B2 (en) | 2018-08-01 | 2022-09-02 | 和則 川島 | scale |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07205006A (en) | 1995-08-08 |
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