JPH11300531A - Rotating electrode type electric discharge device and electric discharge method thereof - Google Patents

Rotating electrode type electric discharge device and electric discharge method thereof

Info

Publication number
JPH11300531A
JPH11300531A JP11637298A JP11637298A JPH11300531A JP H11300531 A JPH11300531 A JP H11300531A JP 11637298 A JP11637298 A JP 11637298A JP 11637298 A JP11637298 A JP 11637298A JP H11300531 A JPH11300531 A JP H11300531A
Authority
JP
Japan
Prior art keywords
electric discharge
electrode
disk
workpiece
shaped electrode
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.)
Withdrawn
Application number
JP11637298A
Other languages
Japanese (ja)
Inventor
Tetsuya Watanabe
哲也 渡辺
Yuji Yamada
祐司 山田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP11637298A priority Critical patent/JPH11300531A/en
Publication of JPH11300531A publication Critical patent/JPH11300531A/en
Withdrawn legal-status Critical Current

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  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

PROBLEM TO BE SOLVED: To enhance the working precision without increasing the electric discharge area to the progress of electric discharge machining by providing a disc-like electrode and a moving mechanism for moving both a rotating mechanism and a feed part. SOLUTION: A disc electrode 8 is moved in an arrowed direction 6, which is the thickness direction of a workpiece, by the operation of an electrode feeding motor according to the cutting speed of the workpiece. After the cutting of the workpiece by the disc electrode 8 is progressed, and the tip of the disc electrode 8 pierces through the workpiece, the movement of the disc electrode 8 in the arrowed direction 6 is stopped. A machining head feeding motor 20 is then operated to move a machining head 1 in the longitudinal direction laid along the workpiece of an arrow 22. Thus, the disc electrode 8 continuously and quickly cuts the workpiece in the state having high electric discharge machining performance in the longitudinal direction to smoothen the cut surface of the workpiece 7.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、加工液中にて行う
放電加工に係り、特に原子炉内や燃料貯蔵プール内の水
中で、放射線が照射されて高放射性物質化された構造物
および機器類で、硬度の高い金属等を切断する回転電極
式放電加工装置とその放電加工方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electric discharge machining performed in a machining fluid, and more particularly to a structure and an apparatus which are irradiated with radiation in a water in a nuclear reactor or a fuel storage pool to be highly radioactive. The present invention relates to a rotating electrode type electric discharge machine for cutting a metal or the like having high hardness and a method of electric discharge machining.

【0002】[0002]

【従来の技術】加工液であるたとえば水中で放電加工に
より被加工物を切断する場合には、帯状電極や円板状電
極またはワイヤ電極により、被加工物との間で放電を発
生させると共に、その放電作用により電極と対向する部
分の被加工物を除去することにより切断を行っている。
2. Description of the Related Art In the case of cutting a workpiece by electric discharge machining in, for example, water, which is a machining fluid, a discharge is generated between the workpiece and a strip-shaped electrode, a disk-shaped electrode, or a wire electrode. Cutting is carried out by removing the workpiece facing the electrode by the discharge action.

【0003】[0003]

【発明が解決しようとする課題】帯状電極による放電加
工では、被加工物の加工量(厚さ)が大きくなると、加
工途中で電極が消耗して交換する必要があることから、
この帯状電極の交換時点では、加工面において段差が生
じて切断面が平滑にならない支障があった。また、円板
状電極については、放電加工が進行するにつれて被加工
物との放電加工面積が増加することから、放電電流密度
等の放電加工条件が変化して加工速度と共に、加工性能
が低下するという課題がある。
In the electric discharge machining using a strip-shaped electrode, if the machining amount (thickness) of a workpiece increases, the electrode is worn out during machining and needs to be replaced.
At the time of replacement of the strip-shaped electrode, there was a problem that a step was generated on the processed surface and the cut surface was not smooth. Further, as for the disk-shaped electrode, since the electric discharge machining area with the workpiece increases as the electric discharge machining progresses, electric discharge machining conditions such as a discharge current density change and machining performance decreases with machining speed. There is a problem that.

【0004】さらにワイヤ電極においては、放電加工条
件とワイヤ電極の張力を絶えず適正に維持していないと
ワイヤ電極が切断し易いことから、ワイヤ電極の供給調
整に常に留意する必要があった。
Further, in the case of the wire electrode, the wire electrode is easily cut unless the electric discharge machining conditions and the tension of the wire electrode are constantly maintained properly.

【0005】さらに、放電加工部においては、被加工物
等からの切粉等の加工屑が生じ、この加工屑が放電部分
に干渉して放電加工性能を低下させたり、加工面を荒ら
すことから、放電加工部に対して加工液の水を噴射させ
る等して加工屑を排除するが、この加工屑が周囲の水中
に拡散し、回収が困難なことと汚染が拡大する不具合が
あった。
[0005] Further, in the electric discharge machining portion, machining chips such as cutting chips from a workpiece or the like are generated, and the machining chips interfere with an electric discharge portion, thereby lowering electric discharge machining performance or roughening a machining surface. In addition, the processing waste is removed by, for example, spraying water of the working fluid onto the electric discharge machining part. However, the processing waste is diffused into the surrounding water, and there is a problem that the collection is difficult and the contamination is increased.

【0006】本発明の目的とするところは、放射状溝を
形成した円板状電極を回転駆動機構により回転させると
共に加工屑の回収装置を設け、全体を移動機構により適
切に移動させて、放電加工の進行に対して放電加工面積
を増加させることなく、加工精度が良好で加工屑を周囲
に拡散させない回転電極式放電加工装置とその放電加工
方法を提供することにある。
It is an object of the present invention to provide an electric discharge machining apparatus in which a disk-shaped electrode having a radial groove formed thereon is rotated by a rotary drive mechanism, and a device for collecting machining chips is provided. It is an object of the present invention to provide a rotary electrode type electric discharge machine and a method for electric discharge machining, wherein the machining accuracy is good and the machining chips are not diffused around without increasing the electric discharge machining area with the progress of the electric discharge machining.

【0007】[0007]

【課題を解決するための手段】上記目的を達成するため
請求項1記載の発明に係る回転電極式放電加工装置は、
円板状の電極と、この円板状電極を回転させる回転駆動
機構と、前記回転する円板状電極に通電する給電部と、
前記円板状電極および回転駆動機構と給電部を共に移動
させる移動機構とからなることを特徴とする。
According to a first aspect of the present invention, there is provided a rotary electrode type electric discharge machine according to the present invention.
A disk-shaped electrode, a rotation drive mechanism for rotating the disk-shaped electrode, and a power supply unit for energizing the rotating disk-shaped electrode,
It is characterized by comprising a moving mechanism for moving the power supply section together with the disk-shaped electrode and the rotary drive mechanism.

【0008】寿命も長く放電加工効率の優れた円板状電
極を、回転駆動機構により良好な放電条件を得る回転速
度に回転させると共に、前記円板状電極に給電部から通
電させる加工ヘッドを、同時に移動機構部により加工進
度に合わせて移動させることにより、被加工物に対して
遠隔操作で精度良く、放電加工効率の良い放電加工作業
ができる。
A machining head that rotates a disc-shaped electrode having a long life and excellent electric discharge machining efficiency at a rotational speed at which good discharge conditions are obtained by a rotation drive mechanism, and energizing the disc-shaped electrode from a power supply unit, At the same time, by moving the workpiece in accordance with the progress of the machining by the moving mechanism, the electric discharge machining operation can be performed on the workpiece by remote control with high accuracy and high electric discharge machining efficiency.

【0009】請求項2記載の発明に係る回転電極式放電
加工装置は、請求項1において、回転電極式放電加工装
置は、円板状電極の周囲に切粉等の加工屑の回収装置を
設けたことを特徴とする。放電加工により発ずる切粉等
の加工屑は、円板状電極の周囲から回収装置により効率
良く回収されるので、放電加工部の加工屑は強制的に外
部に排出されて、放電加工部における放電加工性能を常
時良好に維持することができる。
According to a second aspect of the present invention, there is provided a rotary electrode type electric discharge machine according to the first aspect, wherein the rotary electrode type electric discharge machine is provided with a device for collecting machining chips such as cutting chips around a disk-shaped electrode. It is characterized by having. Processing chips such as cutting chips generated by electric discharge machining are efficiently collected from the periphery of the disc-shaped electrode by the collecting device, so that the machining chips in the electric discharge machining section are forcibly discharged to the outside, and are discharged in the electric discharge machining section. The electric discharge machining performance can always be maintained satisfactorily.

【0010】請求項3記載の発明に係る回転電極式放電
加工装置は、請求項1において、円板状電極は、放電加
工部における切粉排出や冷却効果を高める放射状溝を形
成したことを特徴とする。円板状電極に設けた放射状溝
は、放電加工部より切粉等の加工屑を排出すると共に、
新加工液を送り込むので、放電加工部における加工液の
純度維持ができ、さらに冷却効果により加工液の気泡化
や電極の変形等を抑制し、サイドアークを減少させて放
電加工性能が向上するので加工速度を早めることができ
る。
According to a third aspect of the present invention, there is provided a rotary electrode type electric discharge machining apparatus according to the first aspect, wherein the disk-shaped electrode is formed with a radial groove for enhancing chip discharge and cooling effect in the electric discharge machining portion. And Radial grooves provided on the disc-shaped electrode discharge machining chips such as cutting chips from the electric discharge machining part,
Since the new machining fluid is supplied, the purity of the machining fluid in the electric discharge machining part can be maintained, and the cooling effect suppresses the formation of bubbles in the machining fluid and the deformation of the electrodes. Processing speed can be increased.

【0011】請求項4記載の発明に係る回転電極式放電
加工装置は、請求項3または請求項4において、円板状
電極は、放電加工面積を小さくして放電加工速度を速め
ることが可能なように内周部の厚さを外周部より薄くし
たことを特徴とする。
According to a fourth aspect of the present invention, there is provided a rotary electrode type electric discharge machining apparatus according to the third or fourth aspect, wherein the disk-shaped electrode is capable of increasing the electric discharge machining speed by reducing the electric discharge machining area. As described above, the thickness of the inner peripheral portion is made smaller than that of the outer peripheral portion.

【0012】円板状電極の内周部分の厚さを外周部分よ
り薄くすることにより、被加工物と対峙する円板状電極
の外周部分との間の放電加工部における放電面積を狭く
できるので放電電流密度が向上する。また、被加工物と
円板状電極の内周部分におけるサイドアークが減少し、
切粉等の加工屑の排出が容易となることから切断速度を
速くして放電加工効率が向上する。
By making the thickness of the inner peripheral portion of the disc-shaped electrode smaller than that of the outer peripheral portion, the discharge area in the electric discharge machining portion between the workpiece and the outer peripheral portion of the disc-shaped electrode can be reduced. The discharge current density is improved. Also, the side arc at the inner periphery of the workpiece and the disc-shaped electrode is reduced,
Since the discharge of machining chips such as cutting chips becomes easy, the cutting speed is increased and the electric discharge machining efficiency is improved.

【0013】請求項5記載の発明に係る回転電極式放電
加工装置は、請求項3または請求項4において、円板状
電極は、一体型あるいは分割組立型としたことを特徴と
する。円板状電極は比較的小型か材質が単一種のときは
一体型に、比較的大型か材質が異種組合せのときは分割
組立型とすることにより、製造および取扱いが容易にな
る。
A rotary electrode type electric discharge machine according to a fifth aspect of the present invention is characterized in that, in the third or fourth aspect, the disk-shaped electrode is of an integral type or a divided assembly type. When the disk-shaped electrode is relatively small or made of a single material, it is of an integrated type, and when it is relatively large or made of a heterogeneous material, it is of a split-assembly type.

【0014】請求項6記載の発明に係る回転電極式放電
加工装置は、請求項3乃至請求項5において、円板状電
極は、材質をグラファイトまたは銀−タングステン合
金、あるいは銅−タングステン合金の単一種型または異
種組合せ型としたことを特徴とする。円板状電極の材質
を放電加工時の電極消耗が少ないグラファイト、または
銀−タングステン合金、あるいは銅−タングステン合金
とすることにより、長寿命化されて加工精度が良く長時
間の放電加工が行える。
According to a sixth aspect of the present invention, there is provided a rotary electrode type electric discharge machine according to any one of the third to fifth aspects, wherein the disk-shaped electrode is made of graphite, silver-tungsten alloy, or copper-tungsten alloy. It is characterized by a single type or a combination of different types. By using graphite, silver-tungsten alloy, or copper-tungsten alloy, which has a small electrode consumption during electric discharge machining, as the material of the disc-shaped electrode, the life can be prolonged, the machining accuracy is good, and the electric discharge machining can be performed for a long time.

【0015】請求項7記載の発明に係る回転電極式放電
加工装置は、請求項1において、回転駆動機構は、円板
状電極の回転数を0〜 100rpmに可変駆動することを
特徴とする。円板状電極の回転数を0〜 100rpmに可
変することにより、適切な放電条件を選択して最適な放
電性能による放電加工が行える。
According to a seventh aspect of the present invention, there is provided a rotary electrode type electric discharge machine according to the first aspect, wherein the rotary drive mechanism variably drives the rotational speed of the disk-shaped electrode to 0 to 100 rpm. By varying the number of revolutions of the disc-shaped electrode from 0 to 100 rpm, appropriate electric discharge conditions can be selected to perform electric discharge machining with optimal electric discharge performance.

【0016】請求項8記載の発明に係る回転電極式放電
加工装置は、請求項1において、移動機構は、被加工物
の厚さ方向への移動と、長さ方向への移動、および厚さ
方向と長さ方向への同時移動が可能なことを特徴とす
る。移動機構により加工ヘッドを移動して円板状電極
を、被加工物の厚さ方向への移動と、長さ方向への移
動、または厚さ方向と長さ方向の2方向へ同時に移動す
ることにより、放電加工部において最適放電条件が設定
できると共に、被加工物の形状に沿った放電加工作業が
できる。
According to an eighth aspect of the present invention, in the rotary electrode type electric discharge machine according to the first aspect, the moving mechanism is configured to move the workpiece in the thickness direction, the length direction, and the thickness. It is characterized in that simultaneous movement in the direction and the length direction is possible. Moving the processing head by the moving mechanism to move the disk-shaped electrode in the thickness direction and the length direction of the workpiece, or simultaneously in the thickness direction and the length direction. Thereby, the optimum electric discharge condition can be set in the electric discharge machining part, and the electric discharge machining operation along the shape of the workpiece can be performed.

【0017】請求項9記載の発明に係る放電加工方法
は、課電した電極と被加工物との間の放電作用により電
極と対向した被加工物部分を除去する放電加工方法にお
いて、円板状で周囲に放射状溝を形成して内周部の厚さ
が外周部より薄い円板状電極を適切な回転速度で回転さ
せながら、被加工物の厚さ方向および長さ方向に移動さ
せて被加工物を切断すると共に、この切断により生じた
加工屑を回収装置により回収することを特徴とする。
According to a ninth aspect of the present invention, there is provided an electric discharge machining method for removing a portion of a workpiece facing an electrode by an electric discharge action between the charged electrode and the workpiece. A radial groove is formed around the periphery of the electrode, and the thickness of the inner peripheral part is smaller than that of the outer peripheral part. While rotating the disc-shaped electrode at an appropriate rotation speed, it is moved in the thickness direction and length direction of the workpiece. It is characterized in that the work is cut, and the processing waste generated by the cutting is collected by a collecting device.

【0018】被加工物と円板状電極との間に課電した放
電加工装置を、被加工物の厚さに応じて、薄い物の場合
は厚さ方向に移動させて切断し、厚い物の場合は先ず厚
さ方向に突き切り、円板状電極の先端が若干突き出した
状態で、長手方向に移動させて被加工物を切断する。さ
らに、被加工物等から生じた加工屑は回収装置により回
収して、加工液中に拡散することを防止する。これによ
り、放電加工面積が小さく速い加工速度により、放電加
工効率が高い放電加工作業を行うことができる。
The electric discharge machining device charged between the workpiece and the disk-shaped electrode is cut in accordance with the thickness of the workpiece by moving the workpiece in the thickness direction in the case of a thin workpiece. In the case of (1), the workpiece is cut in the thickness direction, and the workpiece is cut in the longitudinal direction with the tip of the disc-shaped electrode slightly protruding. Further, the processing waste generated from the workpiece or the like is recovered by the recovery device, and is prevented from diffusing into the processing liquid. Thus, an electric discharge machining operation having a high electric discharge machining efficiency can be performed with a small electric discharge machining area and a high machining speed.

【0019】[0019]

【発明の実施の形態】本発明の一実施の形態について図
面を参照して説明する。第1実施の形態は請求項1乃至
請求項9に係り、回転電極式放電加工装置について、図
1の斜視構成図および図2の一部切断図で、(a)の正
面図と(b)の側面図に示す。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. The first embodiment relates to claims 1 to 9, and is a perspective view of a rotary electrode type electric discharge machine shown in FIG. 1 and a partially cutaway view of FIG. 2, and FIG. Is shown in the side view.

【0020】回転電極式放電加工装置の加工ヘッド1
は、箱型のフレーム2の上面に敷設した電極レール3の
上に、上部ベース4を電極送りスライド5にて搭載し、
矢印6で示すように被加工物7の板厚方向である前後方
向に摺動自在としている。この上部ベース4には、円板
状電極8を取付けた駆動軸9を電気的に絶縁して、ベア
リング10を介して回転自由に支持すると共に、給電部で
ある給電ブラシ11と、回転駆動機構である電極回転モー
タ12、および電極送りモータ13が取り付けられている。
Machining head 1 of rotary electrode type electric discharge machine
Mounts the upper base 4 on the electrode rail 3 laid on the upper surface of the box-shaped frame 2 with the electrode feed slide 5,
As shown by an arrow 6, the workpiece 7 is slidable in the front-rear direction, which is the thickness direction of the workpiece 7. The upper base 4 is electrically insulated from a drive shaft 9 to which the disk-shaped electrode 8 is attached, and is rotatably supported via a bearing 10. A power supply brush 11 as a power supply unit and a rotation driving mechanism The electrode rotation motor 12 and the electrode feed motor 13 are attached.

【0021】また、前記給電ブラシ11は、離れて設置し
た制御装置14から、放電電源ケーブル15を介して放電加
工のために適切に制御された電流を、駆動軸9を経由し
て円板状電極8に供給する。さらに、前記電極回転モー
タ12の運転により、前記駆動軸9を介して円板状電極8
を矢印16の方向に回転させる。なお、電極送りモータ13
は、前記上部ベース4を電極送りスライド5を介して円
滑に、電極レール3上を矢印6の方向に移動させる。
The power supply brush 11 is supplied with a current appropriately controlled for electric discharge machining through a discharge power cable 15 from a control device 14 installed at a distance, through a drive shaft 9 into a disk-like shape. It is supplied to the electrode 8. Further, the operation of the electrode rotation motor 12 causes the disk-shaped electrode 8 to be driven through the drive shaft 9.
Is rotated in the direction of arrow 16. The electrode feed motor 13
Moves the upper base 4 smoothly on the electrode rail 3 in the direction of the arrow 6 via the electrode feed slide 5.

【0022】また、箱型のフレーム2は、その下面に加
工ヘッド送りスライド17が取り付けられていて、ベース
18の上面に敷設した加工ヘッドレール19の上に摺動自在
に搭載している。
The box-shaped frame 2 has a processing head feed slide 17 attached to the lower surface thereof, and
It is slidably mounted on a processing head rail 19 laid on the upper surface of 18.

【0023】箱型のフレーム2の下部には、加工ヘッド
送りモータ20が取り付けられていて、この加工ヘッド送
りモータ20は図示しない減速機等を介して、前記加工ヘ
ッドレール19の間に敷設したギヤレール21と噛み合っ
て、加工ヘッド1を矢印22で示すように前記矢印16と直
角方向で、被加工物7に沿った方向である左右方向に移
動可能に構成している(請求項1)。
A machining head feed motor 20 is attached to the lower portion of the box-shaped frame 2, and the machining head feed motor 20 is laid between the machining head rails 19 via a speed reducer (not shown). The processing head 1 is configured to be able to move in the left-right direction, which is a direction along the workpiece 7 in a direction perpendicular to the arrow 16 as shown by an arrow 22 by engaging with the gear rail 21 (claim 1).

【0024】なお、前記制御装置14から加工ヘッド1に
対して、制御ケーブル23が接続されており、前記電極回
転モータ12と電極送りモータ13および加工ヘッド送りモ
ータ20の運転制御をする。これにより、円板状電極8の
回転と回転数制御および停止、また、円板状電極8の被
加工物7に対する厚さ方向および長さ方向の移動と、厚
さ方向と長さ方向の同時移動、さらに移動方向と速度の
制御を行う(請求項8)。
A control cable 23 is connected from the control device 14 to the processing head 1 and controls the operation of the electrode rotating motor 12, the electrode feed motor 13 and the processing head feed motor 20. Thereby, the rotation of the disk-shaped electrode 8, the control of the number of rotations, and the stop are performed. The movement, and further, the direction and speed of movement are controlled (claim 8).

【0025】また、図1に示すように上部ベース4に、
加工屑を回収する回収装置24として、前記円板状電極8
の被加工物7に接する部分を除いた周囲を囲った吸引ダ
クト25を設置すると共に、この吸引ダクト25に接続した
吸引ホース26、およびこの吸引ホース26の先端に、加工
屑と周囲の加工液を一緒に吸引する図示しない吸引ポン
プとフィルタを設けて構成している(請求項2)。
Also, as shown in FIG.
As the collecting device 24 for collecting the processing waste, the disc-shaped electrode 8 is used.
A suction duct 25 surrounding the part except for a part in contact with the workpiece 7 is provided, and a suction hose 26 connected to the suction duct 25 and a tip of the suction hose 26 are provided with processing dust and surrounding processing fluid. Are provided with a suction pump and a filter (not shown) for sucking together.

【0026】前記円板状電極8は、図3(a)の平面図
および、(b)の前記(a)のA−A線に沿った断面図
に示すように、円板状の薄板で被加工物7との放電加工
部7aにおける切粉等の加工屑の排出を容易にして、冷
却効果を高めるために複数の放射状溝27を形成した構成
としている(請求項3)。さらに、円板状電極8の厚さ
を、放電加工面積を小さくして放電加工速度を高めるた
めに、被加工物7に対する放電加工を行わない内周部8
aの厚さを、放電加工を行う外周部8bより薄くして段
付き形状に構成する(請求項4)。
As shown in the plan view of FIG. 3A and the cross-sectional view taken along the line AA of FIG. 3A, the disk electrode 8 is a disk-shaped thin plate. A plurality of radial grooves 27 are formed to facilitate the discharge of machining chips such as cutting chips in the electric discharge machining portion 7a with the workpiece 7 and to enhance the cooling effect (claim 3). Furthermore, in order to reduce the electric discharge machining area and increase the electric discharge machining speed, the thickness of the disk-shaped electrode 8 is increased so that the inner peripheral portion 8 where electric discharge machining is not performed on the workpiece 7 is performed.
The thickness of “a” is made smaller than the outer peripheral portion 8b on which the electric discharge machining is performed, thereby forming a stepped shape.

【0027】また円板状電極は、上記図3に示す一体型
の円板状電極8の他に、図4(a)の要部平面図、およ
び(b)の前記(a)の矢視した側面図に示すように、
製造および取扱いが容易な組立型として、たとえば1/
4分割の電極片28cを4個組合わせて組立てることで、
1つの円板状電極28となるような構成としている(請求
項5)。
Further, in addition to the integrated disk-shaped electrode 8 shown in FIG. 3, the disk-shaped electrode is a plan view of a main part of FIG. 4 (a) and an arrow of FIG. 4 (a). As shown in the side view,
As an assembly type that is easy to manufacture and handle, for example, 1 /
By assembling and assembling four four-piece electrode pieces 28c,
The configuration is such that it becomes one disk-shaped electrode 28 (claim 5).

【0028】前記円板状電極8,28は、いずれも材質と
してグラファイト、または銀−タングステン合金、ある
いは銅−タングステン合金を用いるが、それぞれの形状
および寸法により単一種型の他に、導電性を考慮する内
周部8a,28aと放電加工性や耐磨耗性を重視する外周
部8b,28bとで、材質を変えた異種組合せ型の構成と
する(請求項6)。
The disc-shaped electrodes 8 and 28 are made of graphite, silver-tungsten alloy, or copper-tungsten alloy as a material. The inner peripheral portions 8a and 28a to be considered and the outer peripheral portions 8b and 28b that place importance on electric discharge machining and abrasion resistance have different materials of different combinations (claim 6).

【0029】前記円板状電極8,28は、回転駆動機構で
ある電極回転モータ12により駆動されるが、その回転数
を放電加工に際して放電加工性能と共に、放電加工部7
aの冷却効果および加工屑の排出に最適な回転速度とな
る、0〜 100rpmを可変制御することが可能なよう
に、電極回転モータ12および制御装置14等を構成してい
る(請求項7)。
The disk-shaped electrodes 8, 28 are driven by an electrode rotating motor 12, which is a rotary drive mechanism.
The electrode rotation motor 12, the control device 14, and the like are configured so as to be able to variably control 0 to 100 rpm, which is the optimum rotation speed for the cooling effect a and the discharge of the processing waste (claim 7). .

【0030】回転電極式放電加工装置の放電加工方法と
しては、加工ヘッド1を加工液中において、円板状電極
8,28を被加工物7の表面に近付けた後に、円板状電極
8,28を回転させると共に、円板状電極8,28と被加工
物7との間に課電する。これにより、円板状電極8,28
と被加工物7の間の放電作用で、円板状電極8,28と対
峙する部分の被加工物7が除去される放電加工が行われ
る。
As the electric discharge machining method of the rotary electrode type electric discharge machine, the disk-shaped electrodes 8, 28 are brought close to the surface of the workpiece 7 while the processing head 1 is in the processing liquid, and then the disk-shaped electrodes 8, 28 are turned on. At the same time as 28 is rotated, power is applied between the disk-shaped electrodes 8 and 28 and the workpiece 7. Thereby, the disk-shaped electrodes 8, 28
By the discharge action between the workpiece 7 and the workpiece 7, the electrical discharge machining is performed to remove the workpiece 7 at a portion facing the disk-shaped electrodes 8, 28.

【0031】この放電加工に際して、円板状電極8,28
の回転速度を放電加工状態に応じて適切に選択すると共
に、円板状電極8,28の移動方向を被加工物7の厚さに
より、被加工物7が薄い場合には、被加工物7の厚さ方
向に移動させる。また、被加工物7が厚い場合には、当
初は前記円板状電極8,28を被加工物7の厚さ方向に移
動させ、被加工物と電極間の放電面積が小さくなった時
点で、被加工物7の長さ方向に移動する。なおこの時
に、放電加工により生じた切粉等の加工屑は、周囲の加
工液と一緒に回収装置により回収する(請求項9)。
At the time of this electric discharge machining, the disk-shaped electrodes 8, 28
Is appropriately selected according to the state of the electric discharge machining, and the moving direction of the disk-shaped electrodes 8, 28 is determined by the thickness of the workpiece 7. In the thickness direction. When the workpiece 7 is thick, the disk-shaped electrodes 8, 28 are initially moved in the thickness direction of the workpiece 7, and when the discharge area between the workpiece and the electrode is reduced. The workpiece 7 moves in the longitudinal direction. At this time, machining chips such as cutting chips generated by electric discharge machining are collected by a collecting device together with the surrounding machining fluid.

【0032】次に、上記構成による作用について説明す
る。回転電極式放電加工装置のベース18を、加工ヘッド
1が被加工物7に対して所定の切断加工位置となり、長
手方向に沿って移動可能なように固定する。このベース
18の加工ヘッドレール19の上に、加工ヘッド1を加工ヘ
ッド送りスライド17を介して搭載して、ベース18上のギ
ヤレール21と加工ヘッド送りモータ20とを噛み合わせ
る。
Next, the operation of the above configuration will be described. The base 18 of the rotary electrode type electric discharge machine is fixed so that the machining head 1 is at a predetermined cutting position with respect to the workpiece 7 and is movable in the longitudinal direction. This base
The machining head 1 is mounted on the 18 machining head rails 19 via the machining head feed slide 17, and the gear rail 21 on the base 18 and the machining head feed motor 20 are engaged.

【0033】前記加工ヘッド1は被加工物7と共に加工
液中において、制御装置14の操作により制御ケーブル23
を介して電極送りモータ13を駆動し、円板状電極8を矢
印6の方向で被加工物7の表面に近付けてから、一旦電
極送りモータ13を停止して位置決めをする。
The processing head 1 is moved together with the workpiece 7 in the processing liquid by operating the control device 14 to control the cable 23.
, The electrode feed motor 13 is driven to bring the disk-shaped electrode 8 close to the surface of the workpiece 7 in the direction of arrow 6, and then the electrode feed motor 13 is once stopped to perform positioning.

【0034】この後に、電極回転モータ12を運転して円
板状電極8を回転させてから、円板状電極8と被加工物
7との間に放電電源ケーブル15から課電すると、円板状
電極8と被加工物7の間の放電作用で、円板状電極8と
対峙する部分の被加工物7が除去されて切断作業が開始
される。
Thereafter, the electrode rotating motor 12 is operated to rotate the disk-shaped electrode 8, and then, when a power is applied between the disk-shaped electrode 8 and the workpiece 7 from the discharge power cable 15, The discharge operation between the electrode 8 and the workpiece 7 removes the workpiece 7 at the portion facing the disk-shaped electrode 8 and starts the cutting operation.

【0035】この放電加工による切断作業に際しては、
円板状電極8の回転速度を放電加工状態に応じて適切に
調整すると共に、当初は図5(a)の切断模式図に示す
ように、被加工物7の切断進度に合わせた電極送りモー
タ13の運転により、前記円板状電極8を被加工物7の厚
さ方向である矢印6方向にに移動させる。
In the cutting work by the electric discharge machining,
The rotation speed of the disk-shaped electrode 8 is appropriately adjusted in accordance with the state of the electric discharge machining, and the electrode feed motor is initially adjusted to the degree of cutting of the workpiece 7 as shown in the schematic cutting diagram of FIG. By the operation 13, the disk-shaped electrode 8 is moved in the direction of the arrow 6 which is the thickness direction of the workpiece 7.

【0036】円板状電極8による被加工物7の切断が進
行して、図5(b)の切断模式図に示すように、円板状
電極8の先端が被加工物7を突き抜け、約5mm突出した
位置では、被加工物7と円板状電極8との間の放電面積
が小さくなる。これにより、放電電流密度が高く放電加
工性能が良好となるので、加工速度を速やかにすること
ができる。従って、この時点で電極送りモータ13の運転
を止めて、円板状電極8の矢印6方向への移動を停止す
る。
The cutting of the workpiece 7 by the disk-shaped electrode 8 proceeds, and as shown in the schematic cutaway view of FIG. 5B, the tip of the disk-shaped electrode 8 penetrates the workpiece 7 and At the position protruding by 5 mm, the discharge area between the workpiece 7 and the disk-shaped electrode 8 becomes small. As a result, the discharge current density is high and the electric discharge machining performance is good, so that the machining speed can be increased. Therefore, at this time, the operation of the electrode feed motor 13 is stopped, and the movement of the disk-shaped electrode 8 in the direction of arrow 6 is stopped.

【0037】次に、加工ヘッド送りモータ20を運転し
て、加工ヘッド1を矢印22の被加工物7に沿った長さ方
向に移動させる。これにより、加工ヘッド1の移動と共
に円板状電極8は、被加工物7を長さ方向に対して、連
続的で放電加工性能が高い状態にて、速やかに切断作業
を行うので、被加工物7の切断面に段差ができず平滑に
なる。
Next, the machining head feed motor 20 is operated to move the machining head 1 in the length direction along the workpiece 7 indicated by the arrow 22. As a result, the disk-shaped electrode 8 quickly cuts the workpiece 7 in the longitudinal direction with the movement of the machining head 1 in a continuous and high electric discharge machining performance. No level difference is formed on the cut surface of the object 7, and the surface becomes smooth.

【0038】また、前記被加工物7の形状が屈曲してい
る場合には、前記電極送りモータ13と加工ヘッド送りモ
ータ20の運転および方向切替えを、併行して適切に行う
ことにより、円板状電極8を矢印6方向と矢印22方向へ
同時に移動させることが可能なことから、被加工物7の
複雑な形状に対しても連続して放電加工を行うことがで
きる。
When the shape of the workpiece 7 is bent, the operation and the switching of the direction of the electrode feed motor 13 and the processing head feed motor 20 are appropriately performed in parallel with each other to obtain a disc. Since the shape electrode 8 can be simultaneously moved in the directions of arrows 6 and 22, electric discharge machining can be continuously performed even on a complicated shape of the workpiece 7.

【0039】なお、最適な加工方法の一例として、切断
加工速度は、効率良く放電を持続させるために、円板状
電極8の移動方向の制御を被加工物7の厚さにより変え
ると良い。
As an example of an optimum machining method, the cutting speed is preferably changed by controlling the moving direction of the disk-shaped electrode 8 according to the thickness of the workpiece 7 in order to maintain the discharge efficiently.

【0040】即ち、薄い被加工物7は、上記図5(a)
で矢印6に示す厚さ方向に円板状電極8を移動し、厚い
被加工物7については、先ず、上記図5(a)で矢印6
に示す厚さ方向に突き切り、円板状電極8が若干突き出
た状態から、上記図5(b)で矢印22に示すように長手
方向に移動させて切断する。また、円板状電極8の被加
工物7から突き出す量は、できるだけ少ないほうが良い
が、円板状電極8の摩耗量や放電面積等を考慮して決定
する。
That is, the thin workpiece 7 is formed as shown in FIG.
The disk-shaped electrode 8 is moved in the thickness direction shown by the arrow 6 in FIG. 5, and the thick workpiece 7 is first moved by the arrow 6 in FIG.
5B, the disk-shaped electrode 8 is moved in the longitudinal direction as shown by the arrow 22 in FIG. The amount by which the disk-shaped electrode 8 protrudes from the workpiece 7 is preferably as small as possible, but is determined in consideration of the wear amount of the disk-shaped electrode 8, the discharge area, and the like.

【0041】なお放電加工時に、円板状電極8と被加工
物7との放電加工部7aでは、円板状電極8の回転によ
り円板状電極8の外周の流れと合わせて、複数の放射状
溝27により放射方向に加工液が送り込まれるので、常に
新たな加工液による純度が維持されて効果的に冷却され
るので、加工液の気泡化や円板状電極8の変形等が抑制
される。従って、サイドアークの発生が減少すると共
に、切粉等の加工屑が良好に排出されて放電性能が向上
して加工速度を早めることができる効果がある。
At the time of electric discharge machining, in the electric discharge machining portion 7a of the disc-shaped electrode 8 and the workpiece 7, a plurality of radially-disposed portions are formed by the rotation of the disc-shaped electrode 8 along with the flow on the outer periphery of the disc-shaped electrode 8. Since the machining fluid is sent in the radial direction by the groove 27, the purity of the new machining fluid is always maintained and the cooling is performed effectively, so that the foaming of the machining fluid and the deformation of the disk-shaped electrode 8 are suppressed. . Accordingly, there is an effect that the occurrence of side arcs is reduced, and machining chips such as cutting chips are satisfactorily discharged, so that the discharge performance is improved and the machining speed can be increased.

【0042】また、被加工物7との間で放電加工が行わ
れる円板状電極8の外周部8bの厚さに対して、内周部
8aを薄くしているので、被加工物7と円板状電極8と
の間の放電面積を狭くできると共に、内周部8aと切断
された被加工物7との間隙が大きく得られるので、被加
工物7との干渉がなく、サイドアークの発生が減少し、
かつ加工屑等が排出し易いので加工速度が向上される。
Since the inner peripheral portion 8a is thinner than the outer peripheral portion 8b of the disk-shaped electrode 8 where electric discharge machining is performed between the workpiece 7 and the workpiece 7, The discharge area between the electrode 8 and the disk-shaped electrode 8 can be reduced, and the gap between the inner peripheral portion 8a and the cut workpiece 7 can be increased. Outbreaks decrease,
In addition, the processing speed is improved because processing dust and the like are easily discharged.

【0043】さらに、円板状電極8により切断されて生
じた被加工物7の切粉等の加工屑は、円板状電極8の外
周を覆った回収装置24の吸引ダクト25と吸引ホース26か
ら図示しない吸引ポンプの吸引により周囲の加工液と一
緒に強制的に回収し、フィルタでろ過して加工屑等を捕
捉すると共に、浄化した加工液を再び戻す。これによ
り、放電加工部7aにおける放電加工条件が向上すると
共に、切粉等の加工屑が加工液中に拡散して加工液の純
度が低下することを防止して長時間の放電加工作業を可
能とする。
Further, the processing dust such as cuttings of the workpiece 7 generated by cutting the disk-shaped electrode 8 is removed by the suction duct 25 and the suction hose 26 of the collection device 24 covering the outer periphery of the disk-shaped electrode 8. Then, the liquid is forcibly collected together with the surrounding working fluid by suction of a suction pump (not shown), and is filtered by a filter to capture processing waste and the like, and the purified working fluid is returned again. As a result, the electric discharge machining conditions in the electric discharge machining part 7a are improved, and it is possible to prevent machining dust such as cutting chips from diffusing into the machining fluid and to lower the purity of the machining fluid, thereby enabling a long-time electric discharge machining operation. And

【0044】ここで、たとえば前記円板状電極8は、上
記図3に示す薄板で、材質を銅−タングステン合金の単
一種型とし、放電面積を小さくして加工速度を高めるた
めに、外周部8bの厚さを3mmとすると共に、サイドア
ークを防止することで放電条件を良くするために、内周
部8aは厚さを 2.5mmと薄くして段付きとする。また、
円板状電極8には、被加工物7との放電加工部7aにお
ける切粉等の加工屑の排出が容易であることと、冷却効
果を高めて熱変形等の抑制をするために複数の放射状溝
27を形成している。
Here, for example, the disk-shaped electrode 8 is a thin plate as shown in FIG. 3 and is made of a single type of copper-tungsten alloy. In order to improve the discharge conditions by preventing the side arc from occurring, while making the thickness of 8b 3 mm, the inner peripheral portion 8a is reduced in thickness to 2.5 mm to be stepped. Also,
The disk-shaped electrode 8 is provided with a plurality of pieces for facilitating discharge of machining chips such as cutting chips in the electric discharge machining section 7a with the workpiece 7 and for enhancing a cooling effect to suppress thermal deformation and the like. Radial groove
Forming 27.

【0045】このように本発明による円板状電極と、従
来の平型円板電極とによる放電加工速度の比較例を図6
の加工速度比較図に示す。なお、この時の被加工物は50
mm厚さのステンレス鋼(SUS 304)で、縦軸に長手方
向の電極送り量(mm) 、横軸に加工時間( min)を示
し、実線曲線29は本発明の電極、点線曲線30は従来型電
極の場合を表わす。この加工速度比較図で分かるよう
に、実線曲線29で示す本発明の円板状電極においては、
点線曲線30で示す従来の平型円板電極型に比べて、放電
加工性能が優れている。
FIG. 6 shows a comparative example of the electric discharge machining speed between the disk-shaped electrode according to the present invention and the conventional flat disk-shaped electrode.
Is shown in the comparison diagram of processing speed. The workpiece at this time is 50
mm stainless steel (SUS 304), the vertical axis shows the electrode feed amount (mm) in the longitudinal direction, the horizontal axis shows the processing time (min), the solid curve 29 is the electrode of the present invention, and the dotted curve 30 is the conventional one. This shows the case of a mold electrode. As can be seen from this processing speed comparison diagram, in the disk-shaped electrode of the present invention indicated by the solid curve 29,
The electric discharge machining performance is superior to the conventional flat disk electrode type shown by the dotted curve 30.

【0046】さらに、円板状電極8については、電極回
転モータ12と、この電極回転モータ12を運転制御する制
御装置14により、回転速度を0〜 100rpmまで可変制
御できるようにしている。これにより、円板状電極8の
円滑な起動および運転と停止が行えると共に、被加工物
7の材質や形状等の各種状態に適合して、放電加工に最
適な条件を得るための回転速度を選択して制御すること
ができる。
Further, the rotation speed of the disk-shaped electrode 8 can be variably controlled from 0 to 100 rpm by an electrode rotation motor 12 and a control device 14 for controlling the operation of the electrode rotation motor 12. Thereby, the disk electrode 8 can be smoothly started, operated, and stopped, and the rotational speed for obtaining the optimum conditions for electric discharge machining is adjusted to various conditions such as the material and shape of the workpiece 7. Can be selected and controlled.

【0047】また、円板状電極8については、上記図3
に示す一体型の他に、上記図4に示すように、たとえば
1/4分割の電極片28cを4個合わせて組立てること
で、1つの円板状電極28とする組立型がある。これらは
いずれも、その大きさや製造上および取扱い上で便利な
ものを採用すれば良く、その放電加工における作用と効
果は同じである。
As for the disk-shaped electrode 8, FIG.
In addition to the integrated type shown in FIG. 4, there is an assembled type in which one disk-shaped electrode 28 is formed by assembling and assembling four quarter-piece electrode pieces 28c, for example, as shown in FIG. Any of these may be convenient in size, manufacturing and handling, and the operations and effects in electric discharge machining are the same.

【0048】円板状電極8,28の材質であるグラファイ
ト、または銀−タングステン合金、あるいは銅−タング
ステン合金は、それぞれ放電加工性や耐磨耗性が優れて
いて、被加工物7における切断面が平滑で、円板状電極
8,28の寿命が長く、長時間の連続作業に耐えることが
できる。
Graphite, silver-tungsten alloy, or copper-tungsten alloy, which is a material of the disk-shaped electrodes 8, 28, has excellent electric discharge machining property and abrasion resistance, respectively. Is smooth, the life of the disk-shaped electrodes 8 and 28 is long, and it can withstand long-time continuous work.

【0049】なお、放電加工性と共に寿命や製造し易さ
等の必要に応じて、製造の容易な単一種型の他に、導電
性を重視した内周部8a,28aと放電加工性や耐磨耗性
を考慮する外周部8b,28bとで、材質を変えた異種組
合せ型とすることで、さらに性能が向上する。
In addition to the electric discharge machinability, if necessary, such as life and ease of manufacture, etc., in addition to a single type which is easy to manufacture, the inner peripheral portions 8a and 28a which place importance on conductivity and the electric discharge machinability and the The performance is further improved by using a heterogeneous combination type in which the material is changed between the outer peripheral portions 8b and 28b in consideration of abrasion.

【0050】これにより、加工液中で被加工物7の放電
加工による切断作業が、円板状電極8,28が長寿命で、
長時間にわたり精度良く迅速に効率良く実施することが
できる。また、運転制御が遠く離れた制御装置からの操
作により、容易にできると共に切断作業により生じた切
粉等の加工屑が加工液中に拡散して、加工液の純度を低
下させることがない。
Thus, the cutting work by the electric discharge machining of the workpiece 7 in the machining fluid can be performed by the disk electrodes 8 and 28 having a long service life.
It can be performed accurately, quickly and efficiently for a long time. In addition, operation control can be easily performed by an operation from a control device that is far away, and processing chips such as cutting chips generated by the cutting operation are not diffused into the working fluid, and the purity of the working fluid is not reduced.

【0051】第2実施の形態は、原子炉内におけるシュ
ラウドの切断に適用した例で、図7の斜視図に示すよう
に、放電切断加工装置の加工ヘッド31は、原子炉圧力容
器内で円筒状のシュラウド32の内側にベース34を設置
し、その上にフレーム33を搭載して、加工ヘッド31がシ
ュラウド32に沿って移動が可能な状態に設置する。な
お、この加工ヘッド31については、フレーム33や加工ヘ
ッド31を横方向に移動させるベース34、およびギヤレー
ル35等の形状が上記第1実施の形態と相違している。
The second embodiment is an example in which the present invention is applied to the cutting of a shroud in a nuclear reactor. As shown in a perspective view of FIG. A base 34 is installed inside the shroud 32, and a frame 33 is mounted thereon, so that the processing head 31 can be moved along the shroud 32. The processing head 31 is different from the first embodiment in the shapes of a frame 33, a base 34 for moving the processing head 31 in the lateral direction, a gear rail 35, and the like.

【0052】また、フレーム33に設置された電極回転モ
ータ12と、電極送りモータ13および加工ヘッド送りモー
タ20等の取り付け位置も相違していて、狭い円筒状のシ
ュラウド32の内側において作業が容易に可能な形状とし
ている。なお、加工屑の回収装置については図示を省略
している。
The electrode rotating motor 12 installed on the frame 33 and the mounting positions of the electrode feed motor 13 and the processing head feed motor 20 are also different, so that the work can be easily performed inside the narrow cylindrical shroud 32. It has a possible shape. It should be noted that illustration of the processing waste collection device is omitted.

【0053】放電加工による切断作業は、前記シュラウ
ド32および加工ヘッド31の周囲で、加工液である水が充
満している水中で行うが、シュラウド32は板厚が厚いの
で、先ず、電極送りモータ13により円板状電極8を矢印
6の方向で、被加工物であるシュラウド32に接近した状
態の位置決めをする。電極回転モータ12により円板状電
極8を回転させて、この円板状電極8とシュラウド32と
の間に放電加工のための電流を流すと、円板状電極8と
対峙している部分のシュラウド32が除去されて切断され
る。
The cutting operation by electric discharge machining is performed in the water surrounding the shroud 32 and the machining head 31 and filled with water as a machining liquid. However, since the shroud 32 has a large plate thickness, first, an electrode feed motor is used. The positioning of the disc-shaped electrode 8 in the direction of the arrow 6 is performed by the position 13 in a state of approaching the shroud 32 as a workpiece. When the disk-shaped electrode 8 is rotated by the electrode rotation motor 12 and a current for electric discharge machining is caused to flow between the disk-shaped electrode 8 and the shroud 32, a portion facing the disk-shaped electrode 8 is formed. Shroud 32 is removed and cut.

【0054】次に電極送りモータ13により、円板状電極
8を矢印6の板厚方向に移動することで、円板状電極8
がシュラウド32の内部に切り込まれるので、シュラウド
32を貫通して5mm程突出するまで移動させて、電極送り
モータ13を止める。これにより、円板状電極8とシュラ
ウド32との間の放電面積が小さくなり、放電電流密度が
大きく得られることから、放電加工性能が向上して加工
速度を速くすることができる。
Next, the disk-shaped electrode 8 is moved by the electrode feed motor 13 in the direction of the thickness of the arrow 6, whereby the disk-shaped electrode 8 is moved.
Is cut into the shroud 32, so the shroud
The electrode feed motor 13 is stopped by being moved until it penetrates through 32 and projects about 5 mm. As a result, the discharge area between the disk-shaped electrode 8 and the shroud 32 is reduced, and a large discharge current density is obtained, so that the discharge machining performance is improved and the machining speed can be increased.

【0055】この後に、加工ヘッド送りモータ20を運転
し、ギヤレール35を介してシュラウド32の内面に沿っ
て、矢印22で示す周方向に加工ヘッド31を移動すること
により、円板状電極8はシュラウド32を長手方向に切断
するが、この時に円板状電極8は、良好な放電加工によ
る切断性能を維持した状態で速い切断作業ができる。
Thereafter, the machining head feed motor 20 is operated to move the machining head 31 in the circumferential direction indicated by the arrow 22 along the inner surface of the shroud 32 via the gear rail 35, so that the disc-shaped electrode 8 is The shroud 32 is cut in the longitudinal direction. At this time, the disk-shaped electrode 8 can perform a fast cutting operation while maintaining the cutting performance by good electric discharge machining.

【0056】従って、加工ヘッド31が長手方向に移動さ
せるベース34を、予め、確実に取付けて置くことによ
り、円筒状のシュラウド32のいずれの場所においても安
定した放電加工による切断作業ができる汎用性がある。
なお、円板状電極8を矢印6の板厚方向に移動するだけ
の切断作業の場合には、ベース34およびギヤレール35を
使用せずに、加工ヘッド31を固定した状態で設置して放
電加工を行うことができる。
Therefore, the base 34 to be moved in the longitudinal direction by the machining head 31 is securely mounted in advance, so that the cutting work can be stably performed by electric discharge machining anywhere in the cylindrical shroud 32. There is.
In the case of a cutting operation in which only the disk-shaped electrode 8 is moved in the thickness direction of the arrow 6, the electric discharge machining is performed by installing the machining head 31 in a fixed state without using the base 34 and the gear rail 35. It can be performed.

【0057】[0057]

【発明の効果】以上本発明によれば、水等の加工液中に
おいて放電加工作業により、原子炉内や燃料貯蔵プール
内等の構造物や機器等を長時間にわたり加工効率良く、
しかも高精度で切断を行うことができる。
As described above, according to the present invention, structures and equipment in a nuclear reactor, a fuel storage pool, and the like can be efficiently machined for a long time by electric discharge machining in a machining fluid such as water.
Moreover, cutting can be performed with high accuracy.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係る第1実施の形態の回転電極式放電
加工装置の斜視図。
FIG. 1 is a perspective view of a rotary electrode type electric discharge machine according to a first embodiment of the present invention.

【図2】本発明に係る第1実施の形態の一部切断図で、
(a)は正面図と、(b)は側面図。
FIG. 2 is a partial cutaway view of the first embodiment according to the present invention,
(A) is a front view and (b) is a side view.

【図3】本発明に係る第1実施の形態の一体型円板状電
極で、(a)は平面図、(b)は前記(a)のA−A線
に沿った断面図。
3A and 3B are an integrated disk-shaped electrode according to a first embodiment of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a cross-sectional view taken along line AA of FIG.

【図4】本発明に係る第1実施の形態の分割型円板状電
極で、(a)は1/4分割を示す要部平面図、(b)は
前記(a)の矢視方向の側面図。
4 (a) is a plan view of a main part showing a quarter division, and FIG. 4 (b) is a fragmentary disk-shaped electrode according to the first embodiment of the present invention; FIG. Side view.

【図5】本発明に係る第1実施の形態の切断模式図で、
(a)は板厚方向切断、(b)は周方向切断を示す。
FIG. 5 is a schematic sectional view of the first embodiment according to the present invention,
(A) shows cutting in the thickness direction, and (b) shows cutting in the circumferential direction.

【図6】本発明に係る第1実施の形態と従来との円板状
電極による加工速度比較図。
FIG. 6 is a comparison diagram of a processing speed between the first embodiment according to the present invention and a conventional disk-shaped electrode.

【図7】本発明に係る第2実施の形態の回転電極式放電
加工装置の斜視図。
FIG. 7 is a perspective view of a rotary electrode type electric discharge machine according to a second embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1,31…加工ヘッド、2,33…フレーム、3…電極レー
ル、4…上部ベース、5…電極送りスライド、6…矢印
(前後方向移動)、7…被加工物、7a…放電加工部、
8,28…円板状電極、8a,28a…内周部、8b,28b
…外周部、28c…円板状電極片、9…駆動軸、10…ベア
リング、11…給電ブラシ、12…電極回転モータ、13…電
極送りモータ、14…制御装置、15…放電電源ケーブル、
16…矢印(回転方向)、17…加工ヘッド送りスライド、
18,34…ベース、19…加工ヘッドレール、20…加工ヘッ
ド送りモータ、21,35…ギヤレール、22…矢印(左右方
向移動)、23…制御ケーブル、24…回収装置、25…吸引
ダクト、26…吸引ホース、27…放射状溝、29…実線曲線
(本発明)、30…点線曲線(従来)、32…シュラウド。
1, 31: machining head, 2, 33: frame, 3: electrode rail, 4: upper base, 5: electrode feed slide, 6: arrow (moving in the front-rear direction), 7: workpiece, 7a: electric discharge machining section,
8, 28 ... disk-shaped electrode, 8a, 28a ... inner peripheral part, 8b, 28b
... outer peripheral part, 28c ... disk-shaped electrode piece, 9 ... drive shaft, 10 ... bearing, 11 ... power supply brush, 12 ... electrode rotation motor, 13 ... electrode feed motor, 14 ... control device, 15 ... discharge power cable,
16 ... arrow (rotation direction), 17 ... processing head feed slide,
18, 34: Base, 19: Processing head rail, 20: Processing head feed motor, 21, 35: Gear rail, 22: Arrow (moving in the left-right direction), 23: Control cable, 24: Recovery device, 25: Suction duct, 26 ... suction hose, 27 ... radial groove, 29 ... solid curve (in the present invention), 30 ... dotted curve (conventional), 32 ... shroud.

Claims (9)

【特許請求の範囲】[Claims] 【請求項1】 円板状の電極と、この円板状電極を回転
させる回転駆動機構と、前記回転する円板状電極に通電
する給電部と、前記円板状電極および回転駆動機構と給
電部を共に移動させる移動機構とからなることを特徴と
する回転電極式放電加工装置。
1. A disk-shaped electrode, a rotation drive mechanism for rotating the disk-shaped electrode, a power supply unit for supplying electricity to the rotating disk-shaped electrode, and a power supply for the disk-shaped electrode and the rotation drive mechanism A rotary electrode type electric discharge machine, comprising: a moving mechanism for moving the parts together.
【請求項2】 前記回転電極式放電加工装置は、円板状
電極の周囲に切粉等の加工屑の回収装置を設けたことを
特徴とする請求項1記載の回転電極式放電加工装置。
2. The rotary electrode type electric discharge machine according to claim 1, wherein the rotary electrode type electric discharge machine has a device for collecting machining chips such as cutting chips around a disk-shaped electrode.
【請求項3】 前記円板状電極は、放電加工部における
切粉排出や冷却効果を高める放射状溝を形成したことを
特徴とする請求項1記載の回転電極式放電加工装置。
3. The rotary-electrode-type electric discharge machine according to claim 1, wherein the disk-shaped electrode has a radial groove for enhancing the chip discharge and cooling effect in the electric discharge machining portion.
【請求項4】 前記円板状電極は、放電加工面積を小さ
くして放電加工速度を速めることが可能なように内周部
の厚さを外周部より薄くしたことを特徴とする請求項1
記載の回転電極式放電加工装置。
4. The disk-shaped electrode according to claim 1, wherein an inner peripheral portion has a smaller thickness than an outer peripheral portion so that an electric discharge machining area can be reduced and an electric discharge machining speed can be increased.
A rotary electrode type electric discharge machine according to the above.
【請求項5】 前記円板状電極は、一体型あるいは分割
組立型としたことを特徴とする請求項3または請求項4
記載の回転電極式放電加工装置。
5. The disk-shaped electrode according to claim 3, wherein the disk-shaped electrode is of an integral type or a split-assembly type.
A rotary electrode type electric discharge machine according to the above.
【請求項6】 前記円板状電極は、材質をグラファイト
または銀−タングステン合金、あるいは銅−タングステ
ン合金の単一種型または異種組合せ型としたことを特徴
とする請求項3乃至請求項5記載の回転電極式放電加工
装置。
6. The disk-shaped electrode according to claim 3, wherein the material is a single type or a combination of different types of graphite, silver-tungsten alloy, or copper-tungsten alloy. Rotating electrode type electric discharge machine.
【請求項7】 前記回転駆動機構は、円板状電極の回転
数を0〜 100rpmに可変駆動することを特徴とする請
求項1記載の回転電極式放電加工装置。
7. The rotary-electrode-type electric discharge machine according to claim 1, wherein the rotary drive mechanism variably drives the rotational speed of the disk-shaped electrode to 0 to 100 rpm.
【請求項8】 前記移動機構は、被加工物の厚さ方向へ
の移動と、長さ方向への移動、および厚さ方向と長さ方
向への同時移動が可能なことを特徴とする請求項1記載
の回転電極式放電加工装置。
8. The moving mechanism according to claim 1, wherein the moving mechanism is capable of moving the workpiece in the thickness direction, moving in the length direction, and simultaneously moving in the thickness direction and the length direction. Item 7. A rotary electrode type electric discharge machine according to Item 1.
【請求項9】 課電した電極と被加工物との間の放電作
用により電極と対向した被加工物部分を除去する放電加
工方法において、円板状で周囲に放射状溝を形成して内
周部の厚さが外周部より薄い円板状電極を適切な回転速
度で回転させながら、被加工物の厚さ方向および長さ方
向に移動させて被加工物を切断すると共に、この切断に
より生じた加工屑を回収装置により回収することを特徴
とする放電加工方法。
9. An electric discharge machining method for removing a portion of a workpiece facing an electrode by an electric discharge action between an electrode and a workpiece to which electricity is applied. While rotating the disk-shaped electrode with the thickness of the part thinner than the outer peripheral part at an appropriate rotation speed, it is moved in the thickness direction and length direction of the workpiece and cuts the workpiece, An electrical discharge machining method characterized by recovering waste machining waste by a recovery device.
JP11637298A 1998-04-27 1998-04-27 Rotating electrode type electric discharge device and electric discharge method thereof Withdrawn JPH11300531A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11637298A JPH11300531A (en) 1998-04-27 1998-04-27 Rotating electrode type electric discharge device and electric discharge method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11637298A JPH11300531A (en) 1998-04-27 1998-04-27 Rotating electrode type electric discharge device and electric discharge method thereof

Publications (1)

Publication Number Publication Date
JPH11300531A true JPH11300531A (en) 1999-11-02

Family

ID=14685358

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11637298A Withdrawn JPH11300531A (en) 1998-04-27 1998-04-27 Rotating electrode type electric discharge device and electric discharge method thereof

Country Status (1)

Country Link
JP (1) JPH11300531A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105127529A (en) * 2015-09-06 2015-12-09 清华大学 Rotating feeding spindle head mechanism applicable to wire discharge grinding for micro electric spark machining

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105127529A (en) * 2015-09-06 2015-12-09 清华大学 Rotating feeding spindle head mechanism applicable to wire discharge grinding for micro electric spark machining

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