JP4442495B2 - Wire electrical discharge machining method - Google Patents

Wire electrical discharge machining method Download PDF

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JP4442495B2
JP4442495B2 JP2005112101A JP2005112101A JP4442495B2 JP 4442495 B2 JP4442495 B2 JP 4442495B2 JP 2005112101 A JP2005112101 A JP 2005112101A JP 2005112101 A JP2005112101 A JP 2005112101A JP 4442495 B2 JP4442495 B2 JP 4442495B2
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laminated
cylindrical body
discharge machining
electric discharge
wire
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JP2006289541A (en
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正夫 今野
憲安 猪俣
博通 森奥
明人 秋本
英俊 明石
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Denso Corp
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Description

本発明は、ワイヤ放電加工方法に関し、特に、極薄板を積層接着した積層ブロック体(被加工物)から薄肉積層円筒体を作成するためのワイヤ放電加工方法に関する。   The present invention relates to a wire electric discharge machining method, and more particularly to a wire electric discharge machining method for producing a thin laminated cylindrical body from a laminated block body (workpiece) obtained by laminating and bonding ultrathin plates.

従来からのワイヤ放電加工機は、NC装置からの指令を受けて、所謂XYテーブル上の被加工物を水平方向即ちX方向及びY方向に移動させながらワイヤ電極と被加工物との間にパルス電圧を印加して放電加工を行うものであって、XY両方向の移動が合成されてワイヤ電極に対する相対的な運動となり、その結果、被加工物が所定の形状に放電加工されるものである。   A conventional wire electric discharge machine receives a command from an NC device, and moves a workpiece on a so-called XY table in a horizontal direction, that is, in the X direction and the Y direction, while pulsing between the wire electrode and the workpiece. The electric discharge machining is performed by applying a voltage, and the movement in both X and Y directions is combined to produce a relative movement with respect to the wire electrode. As a result, the workpiece is electric discharge machined into a predetermined shape.

このため、極薄板を積層接着した積層ブロック体(被加工物)から薄肉積層円筒体を作成するためのワイヤ放電加工方法においては、従来は、図1(a)に見られるように、積層ブロック体1’に薄肉積層円筒体3’の内腔となる円筒状孔2’を放電加工により設けて円筒状孔付き積層ブロック体1’を形成し、この円筒状孔付き積層ブロック体1’をXYテーブルのホルダー(図示されていない)に固定して、NC装置(図示されていない)からの指令を受けて、XYテーブル(図示されていない)上の被加工物である円筒状孔付き積層ブロック体1’を水平方向に移動させながら円筒状孔付き積層ブロック体1’の薄肉積層円筒体3’の外周となる部分をワイヤ放電加工によってカットすることにより作成していた。なお、4’はカットラインであり、5’はワイヤ電極で矢印方向に移動する。   For this reason, in the wire electric discharge machining method for producing a thin laminated cylindrical body from a laminated block body (workpiece) obtained by laminating and bonding ultrathin plates, conventionally, as shown in FIG. A cylindrical hole 2 ′ serving as a lumen of the thin laminated cylindrical body 3 ′ is formed in the body 1 ′ by electric discharge machining to form a laminated block body 1 ′ with a cylindrical hole. Cylindrical holed stack which is a workpiece on an XY table (not shown), fixed to an XY table holder (not shown) and receiving a command from an NC device (not shown) While moving the block body 1 ′ in the horizontal direction, the outer peripheral portion of the thin laminated cylinder 3 ′ of the laminated block body 1 ′ having a cylindrical hole is cut by wire electric discharge machining. 4 'is a cut line, and 5' is a wire electrode that moves in the direction of the arrow.

しかし、従来からのこの方法では、放電領域が広く加工部位の移動が少ないため放電加工時に発生する放電熱の逃げ場がなく、薄肉積層円筒体3’の外周となる部分即ちカットライン4’の周囲に順次蓄積される放電熱によって積層板を接着している接着剤の接着強度が低下し、図1(b)に示すような薄肉積層円筒体の極薄板或いは積層板の剥離3’’が発生するという問題があった。   However, in this conventional method, since the discharge region is wide and the movement of the machining part is small, there is no escape space for the discharge heat generated during the electric discharge machining, and the outer periphery of the thin laminated cylinder 3 ′, that is, around the cut line 4 ′. The adhesive strength of the adhesive that adheres the laminated plates decreases due to the discharge heat that is sequentially accumulated, and an extremely thin plate of a thin laminated cylindrical body as shown in FIG. There was a problem to do.

一方で、特許文献1には、被加工物のワイヤ放電加工時に、水平方向の移動以外に回転を与える技術が提示されている。しかし、この技術の被加工物は棒状体であり、薄肉積層円筒体を作成する際の上記問題点の解決を何等示唆するものではない。   On the other hand, Patent Document 1 proposes a technique for providing rotation in addition to horizontal movement during wire electric discharge machining of a workpiece. However, the work piece of this technique is a rod-like body, and does not suggest any solution to the above-described problems when producing a thin laminated cylindrical body.

特開2003−196245号公報JP 2003-196245 A

本発明は、上記の従来技術が有する問題点を改善しようとするものであり、放電加工時に放電熱が発生しても、積層板を接着している接着剤の接着強度の低下を招くことなく、薄肉積層円筒体の極薄板或いは積層板の剥離が生じることのない、極薄板を積層接着した積層ブロック体(被加工物)から薄肉積層円筒体を作成するためのワイヤ放電加工方法を提供することにある。   The present invention is intended to improve the above-mentioned problems of the prior art, and even if discharge heat is generated during electric discharge machining, the adhesive strength of the adhesive bonding the laminate is not reduced. Provided is a wire electric discharge machining method for producing a thin laminated cylindrical body from a laminated block body (workpiece) obtained by laminating and bonding an ultrathin plate without causing any peeling of the thin laminated cylindrical body or the laminated plate. There is.

請求項1のワイヤ放電加工方法は、極薄板を積層接着した積層ブロック体を加工して薄肉積層円筒体を作成するワイヤ放電加工方法において、前記積層ブロック体に前記薄肉積層円筒体の内腔となる円筒状孔を放電加工により設けて円筒状孔付き積層ブロック体を形成し、前記円筒状孔を備え且つ前記薄肉積層円筒体の肉厚よりも厚い肉厚を有する厚肉積層円筒体を前記円筒状孔付き積層ブロック体からワイヤ放電加工により予め作成し、前記厚肉積層円筒体をワイヤ電極の走行方向に対して直角方向の回転軸を有する回転装置に取り付けると共に前記厚肉積層円筒体にワイヤ電極を当接し、前記厚肉積層円筒体をワイヤ電極の移動方向に沿って回転させながら前記回転軸の軸方向に送り出すことにより前記薄肉積層円筒体を作成することを特徴とするものである。   The wire electric discharge machining method according to claim 1, wherein the laminated block body obtained by laminating and bonding ultrathin plates is processed to create a thin laminated cylindrical body. The cylindrical hole is formed by electric discharge machining to form a laminated block body with a cylindrical hole, and the thick laminated cylinder having the cylindrical hole and having a thickness larger than the thickness of the thin laminated cylinder is Prepared in advance by wire electric discharge machining from a laminated block body with a cylindrical hole, and attaches the thick laminated cylindrical body to a rotating device having a rotation axis perpendicular to the traveling direction of the wire electrode and attaches it to the thick laminated cylindrical body. Contacting the wire electrode and creating the thin laminated cylinder by feeding the thick laminated cylinder in the axial direction of the rotating shaft while rotating the thick laminated cylinder along the moving direction of the wire electrode. It is an butterfly.

本発明は、このように構成されているので、積層ブロック体の円筒状孔の周囲を直接カットする従来のワイヤ放電加工方法と異なり、円筒状孔を備え且つ薄肉積層円筒体の肉厚よりも厚い肉厚を有する厚肉積層円筒体を円筒状孔付き積層ブロック体からワイヤ放電加工により予め作成し、回転装置に取り付けられたこの厚肉積層円筒体が常に水に接して回転させながらカットされることとなる。このため、放電加工部が常に回転しながら水に接して冷却されるので、極薄板が積層された接着部の放電熱による温度上昇を極力抑えることができ、その結果、接着剤の接着強度の維持が可能となり、薄肉積層円筒体の極薄板或いは積層板の剥離の防止を図ることができるという効果を奏するものである。
また、被加工物である厚肉積層円筒体の回転方向と電極ワイヤの移動方向を同一方向にすることによりワイヤの切断防止効果が図れる。
Since the present invention is configured as described above, unlike the conventional wire electric discharge machining method that directly cuts the periphery of the cylindrical hole of the laminated block body, the present invention has a cylindrical hole and is thicker than the thickness of the thin laminated cylindrical body. A thick laminated cylindrical body having a thick wall is prepared in advance from a laminated block body with a cylindrical hole by wire electric discharge machining, and this thick laminated cylindrical body attached to a rotating device is cut while always rotating in contact with water. The Rukoto. For this reason, since the electric discharge machined part is always in contact with water while being rotated and cooled, the temperature rise due to the discharge heat of the adhesive part where the ultrathin plates are laminated can be suppressed as much as possible, and as a result, the adhesive strength of the adhesive can be reduced. This makes it possible to maintain such an effect that it is possible to prevent the ultrathin plate or laminated plate of the thin laminated cylindrical body from being peeled off.
Moreover, the wire cutting prevention effect can be achieved by making the rotation direction of the thick laminated cylindrical body, which is the workpiece, and the movement direction of the electrode wire the same direction.

以下、図2〜4を中心に、本発明に係る極薄板を積層接着した積層ブロック体(被加工物)から薄肉積層円筒体を作成するためのワイヤ放電加工方法の実施形態について詳述する。   Hereinafter, an embodiment of a wire electric discharge machining method for producing a thin laminated cylindrical body from a laminated block body (workpiece) obtained by laminating and bonding ultrathin plates according to the present invention will be described in detail with reference to FIGS.

図2(a)において、1は、極薄板を積層接着した積層ブロック体(被加工物)であり、積層ブロック体1に薄肉積層円筒体の内腔となる円筒状孔2を放電加工により設けるという本発明に係るワイヤ放電加工方法の最初の工程により作成された円筒状孔付き積層ブロック体をも同一番号で示している。また、極薄板は、その厚さが薄肉積層円筒体の肉厚とほぼ同等かそれ以下である。   In FIG. 2A, reference numeral 1 denotes a laminated block body (workpiece) obtained by laminating and bonding ultrathin plates, and a cylindrical hole 2 serving as a lumen of a thin laminated cylindrical body is provided in the laminated block body 1 by electric discharge machining. The laminated block body with a cylindrical hole created by the first step of the wire electric discharge machining method according to the present invention is also indicated by the same number. The thickness of the ultrathin plate is approximately equal to or less than the thickness of the thin laminated cylindrical body.

次に、この円筒状孔付き積層ブロック体1から、薄肉積層円筒体を直接切り出す従来例と同様のワイヤ放電加工により、前記円筒状孔2を備え且つ薄肉積層円筒体の肉厚よりも厚い肉厚を有する厚肉積層円筒体3(図2(b))を作成する。図2(a)における4はそのカットラインを示しており、薄肉積層円筒体の仕上がり時の肉厚を、例えば0.5mmとした場合、厚肉積層円筒体3の肉厚は3mm位が適当である。   Next, by means of wire electric discharge machining similar to the conventional example in which a thin laminated cylinder is directly cut out from this laminated block body 1 with a cylindrical hole, the wall having the cylindrical hole 2 and thicker than the thickness of the thin laminated cylinder is obtained. A thick laminated cylindrical body 3 (FIG. 2B) having a thickness is created. 2 in FIG. 2 (a) shows the cut line. When the thickness of the thin laminated cylinder is 0.5 mm, for example, the thickness of the thick laminated cylinder 3 is suitably about 3 mm. It is.

図3は、この厚肉積層円筒体3を被加工物として薄肉積層円筒体3’(図3、図4(b)参照)を作成するための本発明の実施に使用されるワイヤ放電加工機を示している。
図3において、9は、図示されていない公知の駆動制御手段によってワイヤ電極に向けて前後左右のXY方向に移動可能に構成されている水槽形状のXYテーブルであり、ホルダー6はテーブル内の水13に水没している状態で、回転装置10はテーブルに容易に脱着できるものでありワイヤ電極の走行方向に対して直角方向の回転軸を有する回転装置10のホルダー6に回転可能に保持されている厚肉積層円筒体3をワイヤ電極5に向けて送り出す或いはワイヤ電極の位置決めのために厚肉積層円筒体3を左右に移動させる機能を担っている。7はワイヤ支持台であり、8は上下のワイヤ案内部である。図においては、ワイヤ放電加工が進行して厚肉積層円筒体3の先端部分には薄肉積層円筒体3’が形成されていることが理解される。なお、11は、回転装置10を駆動するモーターであり、ワイヤ電極の送りスピードより速く回転することが可能な公知のもので十分であり、12は、回転装置10にモーターの回転を伝えるベルトである。当然のことながら、モーター11は、放電加工の電気が流れないように適切な公知の手段によって電気的に絶縁されている。
FIG. 3 shows a wire electric discharge machine used for carrying out the present invention for producing a thin laminated cylinder 3 ′ (see FIGS. 3 and 4B) using the thick laminated cylinder 3 as a workpiece. Is shown.
In FIG. 3, 9 is an aquarium-shaped XY table configured to be movable in the front, rear, left, and right XY directions toward the wire electrode by a known drive control means (not shown), and the holder 6 is a water tank in the table. 13, the rotating device 10 can be easily attached to and detached from the table, and is rotatably held by the holder 6 of the rotating device 10 having a rotation axis perpendicular to the traveling direction of the wire electrode. The thick laminated cylindrical body 3 is fed toward the wire electrode 5 or has a function of moving the thick laminated cylindrical body 3 left and right for positioning the wire electrode. Reference numeral 7 denotes a wire support, and 8 denotes upper and lower wire guides. In the figure, it is understood that the thin-walled laminated cylinder 3 ′ is formed at the tip portion of the thick-walled laminated cylinder 3 as the wire electric discharge machining proceeds. In addition, 11 is a motor for driving the rotating device 10, and a known motor capable of rotating faster than the feed speed of the wire electrode is sufficient, and 12 is a belt for transmitting the rotation of the motor to the rotating device 10. is there. As a matter of course, the motor 11 is electrically insulated by an appropriate well-known means so as not to flow electricity for electric discharge machining.

また、図4(a)は、図3の回転装置10のホルダー6に厚肉積層円筒体3を回転可能に保持している状態の拡大図であり、図4(b)は、ワイヤ放電加工により厚肉積層円筒体3から薄肉積層円筒体3’を作成している状態を示しており、図4(a)同様の拡大図である。なお、2は薄肉積層円筒体3’の内腔であり、5は矢印方向に移動するワイヤ電極である。   4A is an enlarged view of a state in which the thick laminated cylindrical body 3 is rotatably held by the holder 6 of the rotating device 10 of FIG. 3, and FIG. 4B is a wire electric discharge machining. 4 shows a state in which a thin laminated cylindrical body 3 ′ is created from the thick laminated cylindrical body 3, and is an enlarged view similar to FIG. 4 (a). In addition, 2 is a lumen of the thin laminated cylindrical body 3 ', and 5 is a wire electrode that moves in the direction of the arrow.

図3において、図2(a)、(b)で説明した厚肉積層円筒体3を、ワイヤ電極の走行方向に対して直角方向の回転軸を有する回転装置10のホルダー6に回転可能に保持し、XYテーブルを調整することによって、図4(a)に見られるように、ワイヤ放電加工により厚肉積層円筒体3を薄肉積層円筒体3’に加工するための加工代を考慮して予め設定された厚肉積層円筒体3の先端表面の位置にワイヤ電極5を当接させる。   In FIG. 3, the thick laminated cylindrical body 3 described in FIGS. 2 (a) and 2 (b) is rotatably held by a holder 6 of a rotating device 10 having a rotation axis perpendicular to the traveling direction of the wire electrode. Then, by adjusting the XY table, as shown in FIG. 4 (a), the machining allowance for machining the thick laminated cylinder 3 into the thin laminated cylinder 3 ′ by wire electric discharge machining is taken into consideration in advance. The wire electrode 5 is brought into contact with the set position of the front end surface of the thick laminated cylindrical body 3.

次に、ワイヤ電極5と被加工物である厚肉積層円筒体3との間にパルス電圧を印加すると共に、モーター11を駆動して回転装置10の回転軸を回転させて、ホルダー6に保持されている被加工物である厚肉積層円筒体3を、ワイヤ電極5の送り方向即ち移動方向に沿って回転させながら、XYテーブル9により回転装置10の軸線方向に対して送り出していくことにより、ワイヤ放電加工により厚肉積層円筒体3から薄肉積層円筒体3’を加工形成していくこととなる。   Next, a pulse voltage is applied between the wire electrode 5 and the thick laminated cylindrical body 3 as a workpiece, and the motor 11 is driven to rotate the rotating shaft of the rotating device 10 and is held in the holder 6. By feeding the thick laminated cylindrical body 3 which is a workpiece to be processed, with respect to the axial direction of the rotating device 10 by the XY table 9 while rotating along the feeding direction of the wire electrode 5, that is, the moving direction. Then, the thin laminated cylindrical body 3 ′ is processed and formed from the thick laminated cylindrical body 3 by wire electric discharge machining.

本発明は、以上の通りであるから、積層ブロック体の円筒状孔の周囲を直接カットする従来のワイヤ放電加工方法と異なり、円筒状孔を備え且つ薄肉積層円筒体の肉厚よりも厚い肉厚を有する厚肉積層円筒体を円筒状孔付き積層ブロック体からワイヤ放電により予め作成し、回転装置に取り付けられたこの厚肉積層円筒体が常に水に接して回転させながらカットされることとなる。このため、放電加工部が常に回転しながら水に接して冷却されるので、極薄板が積層された接着部の放電熱による温度上昇を極力抑えることができ、その結果、接着剤の接着強度の維持が可能となり、薄肉積層円筒体の積層板の剥離の防止を図ることができるという効果を奏するものである。
また、被加工物である厚肉積層円筒体の回転方向と電極ワイヤの移動方向を同一方向にすることによりワイヤの切断防止効果が図れる。
Since the present invention is as described above, unlike the conventional wire electric discharge machining method that directly cuts the periphery of the cylindrical hole of the laminated block body, the wall having the cylindrical hole and thicker than the thickness of the thin laminated cylindrical body. A thick laminated cylindrical body having a thickness is prepared in advance from a laminated block body having a cylindrical hole by wire discharge, and the thick laminated cylindrical body attached to the rotating device is always cut while rotating in contact with water. Become. For this reason, since the electric discharge machined part is always in contact with water while being rotated and cooled, the temperature rise due to the discharge heat of the adhesive part where the ultrathin plates are laminated can be suppressed as much as possible, and as a result, the adhesive strength of the adhesive can be reduced. This is advantageous in that it can be maintained, and it is possible to prevent peeling of the laminated plate of the thin laminated cylindrical body.
Moreover, the wire cutting prevention effect can be achieved by making the rotation direction of the thick laminated cylindrical body, which is the workpiece, and the movement direction of the electrode wire the same direction.

積層ブロック体から薄肉積層円筒体を作成するワイヤ放電加工方法の従来例に関する概念図である。It is a conceptual diagram regarding the prior art example of the wire electrical discharge machining method which produces a thin laminated cylindrical body from a laminated block body. 本発明のワイヤ放電加工方法の積層ブロック体から厚肉積層円筒体を作成する工程の概念図である。It is a conceptual diagram of the process of producing a thick laminated cylindrical body from the laminated block body of the wire electric discharge machining method of the present invention. 本発明のワイヤ放電加工方法の厚肉積層円筒体から薄肉積層円筒体を作成する工程に使用するワイヤ放電加工機でテーブルの一部をカットしテーブル内部が見えるようにした斜視図である。It is the perspective view which cut a part of table with the wire electric discharge machine used for the process of producing a thin laminated cylinder from the thick laminated cylinder of the wire electric discharge machining method of this invention so that the inside of a table could be seen. 図3の要部拡大図である。It is a principal part enlarged view of FIG.

符号の説明Explanation of symbols

1,1’ 積層ブロック体、円筒状孔付き積層ブロック体
2,2’ 内腔、円筒状孔
3 厚肉積層円筒体
3’ 薄肉積層円筒体
3’’ 剥離部
4,4’ カットライン
5,5’ ワイヤ電極
6 ホルダー
7 ワイヤ支持台
8 ワイヤ案内部
9 XYテーブル
10 回転装置
11 モーター
12 ベルト
13 水
1, 1 'Laminated block body, Laminated block body with cylindrical hole 2, 2' Lumen, Cylindrical hole 3 Thick laminated cylindrical body 3 'Thin laminated cylindrical body 3 "Peeling part 4, 4' Cut line 5, 5 'wire electrode 6 holder 7 wire support 8 wire guide 9 XY table 10 rotating device 11 motor 12 belt 13 water

Claims (1)

極薄板を積層接着した積層ブロック体を加工して薄肉積層円筒体を作成するワイヤ放電加工方法において、前記積層ブロック体に前記薄肉積層円筒体の内腔となる円筒状孔を放電加工により設けて円筒状孔付き積層ブロック体を形成し、前記円筒状孔を備え且つ前記薄肉積層円筒体の肉厚よりも厚い肉厚を有する厚肉積層円筒体を前記円筒状孔付き積層ブロック体からワイヤ放電加工により予め作成し、前記厚肉積層円筒体をワイヤ電極の走行方向に対して直角方向の回転軸を有する回転装置に取り付けると共に前記厚肉積層円筒体にワイヤ電極を当接し、前記厚肉積層円筒体をワイヤ電極の移動方向に沿って回転させながら前記回転軸の軸方向に送り出すことにより前記薄肉積層円筒体を作成することを特徴とするワイヤ放電加工方法。   In a wire electric discharge machining method for producing a thin laminated cylindrical body by processing a laminated block body obtained by laminating and bonding ultrathin plates, a cylindrical hole serving as a lumen of the thin laminated cylindrical body is provided in the laminated block body by electric discharge machining. A thick-walled cylindrical body having a cylindrical hole and having a thickness greater than the thickness of the thin-layered cylindrical body is formed by wire discharge from the cylindrical-holed multilayer block body. The thick laminated cylinder is prepared in advance by machining, and the thick laminated cylinder is attached to a rotating device having a rotation axis perpendicular to the traveling direction of the wire electrode, and the thick laminated cylinder is brought into contact with the thick laminated cylinder. A wire electric discharge machining method characterized in that the thin laminated cylindrical body is created by feeding a cylindrical body in the axial direction of the rotating shaft while rotating the cylindrical body along the moving direction of the wire electrode.
JP2005112101A 2005-04-08 2005-04-08 Wire electrical discharge machining method Expired - Fee Related JP4442495B2 (en)

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