JP3053944B2 - EDM electrode for forming annular groove - Google Patents
EDM electrode for forming annular grooveInfo
- Publication number
- JP3053944B2 JP3053944B2 JP4005237A JP523792A JP3053944B2 JP 3053944 B2 JP3053944 B2 JP 3053944B2 JP 4005237 A JP4005237 A JP 4005237A JP 523792 A JP523792 A JP 523792A JP 3053944 B2 JP3053944 B2 JP 3053944B2
- Authority
- JP
- Japan
- Prior art keywords
- annular groove
- electrode
- machining electrode
- electric discharge
- machining
- 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 - Lifetime
Links
Landscapes
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は、円筒形のワークの外
周に環状溝を放電加工により形成するのに用いる円板形
の放電加工電極に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped electric discharge machining electrode used for forming an annular groove on the outer periphery of a cylindrical work by electric discharge machining.
【0002】[0002]
【従来の技術】まず、この発明の対象となる放電加工に
より環状溝を形成する加工方法について説明する。図1
に示すように、円板形の加工電極1と研削用の砥石など
の円筒形ワーク2をそれぞれの中心軸PとQを平行に保
って近接配置するとともに(加工液中で)、加工電極1
およびワーク2をそれぞれの中心軸PとQを回転中心と
して回転させながら接近させ、加工電極1とワーク2を
加工電源に接続して放電加工によりワーク2の外周に環
状溝3を形成する。このような放電加工に用いる円板形
の加工電極1がこの発明の対象である。2. Description of the Related Art First, a machining method for forming an annular groove by electric discharge machining, which is an object of the present invention, will be described. FIG.
As shown in FIG. 3, a disk-shaped machining electrode 1 and a cylindrical workpiece 2 such as a grinding wheel are arranged close to each other while keeping their central axes P and Q parallel (in a machining fluid).
Then, the work 2 is brought close to the work 2 while being rotated about the respective central axes P and Q, the machining electrode 1 and the work 2 are connected to a machining power source, and an annular groove 3 is formed on the outer periphery of the work 2 by electric discharge machining. The disk-shaped machining electrode 1 used for such electric discharge machining is an object of the present invention.
【0003】[0003]
【発明が解決しようとする課題】前記のようにワーク2
の外周に環状溝3を加工する上で重要なのは、図2
(A)に示すように、溝3の幅Wが深さ方向の全域にわ
たって均一であり、溝3の最深部の角、および溝3とワ
ーク外周との角がそれぞれできるだけ直角になることで
ある。この目標に対して本発明者らは、厚みが一定で外
周角部が直角になっている加工電極1(図1)を用いて
加工試験を繰返した。その結果、図2(B)に示すよう
に、ワーク2に実際に加工される環状溝3は、その外周
側の溝幅W1が目標値Wより相当大きくなるし、溝最深
部の角および最外周の角も大きく丸まってしまう。この
ような溝形状の不良は、長期使用により加工電極1が消
耗するのにつれて大きくなるが、加工電極1がまったく
消耗していない初期にも相当のレベルで発生する。従来
はこのような問題を克服することができなかったので、
円筒形の砥石のようなワーク2に環状溝3を高精度に形
成する加工は、ワイヤカット放電加工か放電加工以外の
方法によって行なわれていた。As described above, the work 2
The important thing in processing the annular groove 3 on the outer periphery of FIG.
As shown in (A), the width W of the groove 3 is uniform over the entire region in the depth direction, and the corner at the deepest part of the groove 3 and the corner between the groove 3 and the outer periphery of the work are each as perpendicular as possible. . With respect to this target, the present inventors repeated the processing test using the processing electrode 1 (FIG. 1) having a constant thickness and a right outer peripheral corner. As a result, as shown in FIG. 2B, in the annular groove 3 actually machined in the work 2, the groove width W1 on the outer peripheral side thereof becomes considerably larger than the target value W, and the corner and the maximum of the deepest part of the groove are formed. The outer corners are also rounded. Such a defect of the groove shape becomes larger as the processing electrode 1 is consumed by long-term use, but also occurs at a considerable level even in the early stage when the processing electrode 1 is not consumed at all. In the past, we couldn't overcome these problems,
The process of forming the annular groove 3 in the work 2 such as a cylindrical grindstone with high precision has been performed by a method other than wire cut electric discharge machining or electric discharge machining.
【0004】この発明は前述した従来の問題点に鑑みな
されたもので、その目的は、円板形の加工電極により円
筒形のワーク外周に溝形状の精度の良い環状溝を加工す
ることができるようにすることにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to form a highly accurate annular groove in the outer periphery of a cylindrical work by using a disk-shaped machining electrode. Is to do so.
【0005】[0005]
【課題を解決するための手段】そこでこの発明では、前
述のような環状溝を加工するための放電加工電極につい
て、外周側の所定領域の有効部分の形状を表裏対称と
し、かつその厚みを外周から内周に向けて小さくした。According to the present invention, in the electric discharge machining electrode for machining an annular groove as described above, the shape of the effective portion of a predetermined area on the outer peripheral side is symmetrical and the thickness thereof is set to the outer peripheral area. Down to the inner circumference.
【0006】[0006]
【作用】前記円板形加工電極の最外周と円筒形ワークと
の微小ギャップで放電が起き、環状溝が徐々に形成され
る。環状溝がある程度深くなると、溝内に加工電極が入
り込む。そのとき加工電極の最外周が最も厚いので、電
極最外周とワークとの間の微小ギャップにて放電が起き
るが、加工された環状溝の最外周部分と加工電極との間
のギャップは大きく保たれるので、この部分で不要な放
電が起きたり電解反応が生じることはほとんどない。The discharge occurs in the minute gap between the outermost periphery of the disk-shaped machining electrode and the cylindrical work, and the annular groove is gradually formed. When the annular groove becomes deeper to some extent, the machining electrode enters the groove. At this time, since the outermost periphery of the machining electrode is the thickest, discharge occurs in a small gap between the outermost periphery of the electrode and the workpiece, but the gap between the outermost periphery of the machined annular groove and the machining electrode is kept large. Unnecessary discharge or electrolytic reaction hardly occurs in this part because of dripping.
【0007】[0007]
【実施例】図3にこの発明による環状溝形成用の放電加
工電極1の具体的な形状例を示している。中心軸部1a
と同心に円板形の加工電極1が一体になっているという
基本構成は従来のものと同じである。しかし円板形加工
電極1の厚みは一定ではなく、最外周部分の厚みWaが
最も大きく、内周の厚み寸法Wbまで徐々に小さくなっ
ている。しかも円板形加工電極1の形状は表裏対称であ
り、したがって加工電極1の表面および裏面と中心軸P
のなす角度θは等しい。FIG. 3 shows a specific example of the shape of the electric discharge machining electrode 1 for forming an annular groove according to the present invention. Center shaft 1a
The basic configuration that the disk-shaped machining electrode 1 is integrated concentrically with the conventional one is the same as the conventional one. However, the thickness of the disk-shaped electrode 1 is not constant, the thickness Wa at the outermost portion is the largest, and gradually decreases to the thickness Wb at the inner portion. Moreover, the shape of the disk-shaped machining electrode 1 is symmetrical, so that the front and back surfaces of the machining electrode 1 and the central axis P
Are equal.
【0008】図4には図3のように構成された加工電極
1を用いて円筒形ワーク2の外周に環状溝3を放電加工
により形成している途中の状態を示している。同図に示
すように、円板形加工電極1の最外周部分がワーク2の
環状溝3の最深部に入り込んだ状態で加工が進んでいく
わけであるが、電極1の最外周部分の厚みWaが最も大
きく、内周に向かうにつれて電極1の厚さが小さくなっ
ているので、溝3の外周部分と電極1とのギャップは比
較的大きく保たれ、電極1の最外周部分と溝3の最深部
分との微小ギャップ部分で放電が起き、加工が進行す
る。溝3の外周部分と電極1の間では不必要な放電や電
解反応が起きず、したがって溝幅が広がったり丸まった
りする不良が生じにくくなる。FIG. 4 shows a state in which an annular groove 3 is being formed on the outer periphery of a cylindrical workpiece 2 by electric discharge machining using the machining electrode 1 configured as shown in FIG. As shown in the figure, the machining proceeds while the outermost peripheral portion of the disk-shaped machining electrode 1 enters the deepest portion of the annular groove 3 of the work 2, and the thickness of the outermost peripheral portion of the electrode 1 is increased. Since Wa is the largest and the thickness of the electrode 1 decreases toward the inner periphery, the gap between the outer peripheral portion of the groove 3 and the electrode 1 is kept relatively large, and the outermost peripheral portion of the electrode 1 and the Discharge occurs in a minute gap portion from the deepest portion, and machining proceeds. Unnecessary discharge and electrolytic reaction do not occur between the outer peripheral portion of the groove 3 and the electrode 1, so that a defect that the groove width is widened or rounded is less likely to occur.
【0009】[0009]
【発明の効果】以上詳細に説明したように、外周から内
周に向けて厚みが徐々に小さくて、かつ表裏対称形状と
した本発明による円板形の加工電極を用いることによ
り、円筒形のワーク外周に放電加工で環状溝を形成する
場合、加工される環状溝の溝幅は深さ方向にほぼ均一と
なり、溝最深部の角部分や最外周部分の角部分も大きく
丸まることがなく、溝幅が一定で角形状が鋭角な環状溝
を得ることができる。As described in detail above, by using the disk-shaped machining electrode according to the present invention having a gradually decreasing thickness from the outer periphery to the inner periphery and having a symmetrical shape on the front and back, a cylindrical shape is obtained. When forming an annular groove on the outer periphery of the workpiece by electric discharge machining, the groove width of the annular groove to be machined becomes substantially uniform in the depth direction, and the corner portion of the deepest portion of the groove and the corner portion of the outermost peripheral portion are not greatly rounded, An annular groove having a constant groove width and an acute angle can be obtained.
【図1】この発明の対象となる環状溝の放電加工方法を
示す斜視図である。FIG. 1 is a perspective view showing a method of electric discharge machining of an annular groove to which the present invention is applied.
【図2】同上方法により加工される溝形状の理想状態と
従来の実際の状態とを示す図である。FIG. 2 is a diagram showing an ideal state of a groove shape processed by the above-described method and a conventional actual state.
【図3】この発明の一実施例による放電加工電極の構成
図である。FIG. 3 is a configuration diagram of an electric discharge machining electrode according to an embodiment of the present invention.
【図4】図3の放電加工電極により環状溝を加工してい
る途中の説明図である。FIG. 4 is an explanatory view showing a state in which an annular groove is being machined by the electric discharge machining electrode of FIG. 3;
1 加工電極 2 ワーク 3 環状溝 1 machining electrode 2 work 3 annular groove
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−127625(JP,A) 特開 平2−250726(JP,A) 特開 平3−264214(JP,A) 特開 昭57−132925(JP,A) 実開 平2−43164(JP,U) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-127625 (JP, A) JP-A-2-250726 (JP, A) JP-A-3-264214 (JP, A) JP-A 57-127 132925 (JP, A) Hikaru 2-43164 (JP, U)
Claims (1)
れぞれの中心軸を平行に保って近接配置するとともに、
加工電極およびワークをそれぞれの中心軸を回転中心と
して回転させながら接近させ、放電加工によりワーク外
周に環状溝を形成するのに用いる円板形の加工電極であ
って、 外周側の所定領域の有効部分の形状が表裏対称であり、
かつその厚みが外周から内周に向けて徐々に小さくなっ
ていることを特徴とする環状溝形成用の放電加工電極。1. A disk-shaped machining electrode and a cylindrical workpiece are arranged close to each other while keeping their central axes parallel.
A disk-shaped machining electrode used to form an annular groove on the outer periphery of a workpiece by electric discharge machining while rotating the machining electrode and the work around their respective central axes as rotation centers, and the effective area of a predetermined area on the outer periphery is used. The shape of the part is symmetrical,
An electric discharge machining electrode for forming an annular groove, wherein the thickness of the electric discharge machining electrode gradually decreases from the outer periphery to the inner periphery.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4005237A JP3053944B2 (en) | 1992-01-14 | 1992-01-14 | EDM electrode for forming annular groove |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4005237A JP3053944B2 (en) | 1992-01-14 | 1992-01-14 | EDM electrode for forming annular groove |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05185323A JPH05185323A (en) | 1993-07-27 |
JP3053944B2 true JP3053944B2 (en) | 2000-06-19 |
Family
ID=11605593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4005237A Expired - Lifetime JP3053944B2 (en) | 1992-01-14 | 1992-01-14 | EDM electrode for forming annular groove |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3053944B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010046792A (en) * | 2008-07-22 | 2010-03-04 | Yyl:Kk | Cutting apparatus and cutting method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57127625A (en) * | 1981-01-26 | 1982-08-07 | Mitsubishi Heavy Ind Ltd | Narrow groove machining method by electric discharge machining |
JPH01150467A (en) * | 1987-12-07 | 1989-06-13 | Science & Tech Agency | Rotating electrode type arc cutting device |
JPH0243164U (en) * | 1988-09-19 | 1990-03-26 |
-
1992
- 1992-01-14 JP JP4005237A patent/JP3053944B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH05185323A (en) | 1993-07-27 |
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