JPH04348816A - Fine hole electric discharge machine - Google Patents
Fine hole electric discharge machineInfo
- Publication number
- JPH04348816A JPH04348816A JP33776290A JP33776290A JPH04348816A JP H04348816 A JPH04348816 A JP H04348816A JP 33776290 A JP33776290 A JP 33776290A JP 33776290 A JP33776290 A JP 33776290A JP H04348816 A JPH04348816 A JP H04348816A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- machining
- length
- electric discharge
- work
- 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.)
- Granted
Links
- 238000003754 machining Methods 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 238000009760 electrical discharge machining Methods 0.000 description 7
- 230000007704 transition Effects 0.000 description 4
- 238000007792 addition Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009763 wire-cut EDM Methods 0.000 description 1
Landscapes
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、ワイヤカット放電加工を行なう際に被加工体
にスタート穴としての細穴を設ける場合等に使用される
細穴加工機に係り、より詳しくは、所定の長さを有する
細棒状の筒状の電極を加工液を供給しながら被加工体に
近接させ、両者間に間歇的な電圧パルスを加えることに
より、被加工体に貫通細穴を加工する放電加工機に関す
る。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a small hole machining machine used for forming a small hole as a start hole in a workpiece when performing wire cut electrical discharge machining. More specifically, a thin rod-shaped cylindrical electrode having a predetermined length is brought close to the workpiece while supplying machining fluid, and intermittent voltage pulses are applied between the two to penetrate the workpiece. This invention relates to an electric discharge machine for machining small holes.
(従来の技術)
細穴放電加工においては、所定の長さの細棒状をなすパ
イプ状電極を使用し、その内部を通して加工液を加工部
に噴出させ、噴出された加工液を、加工穴の内壁と電極
の外周との間の隙間から加工屑と共に流出させながら加
工を行なう。電極は加工の進行に伴なって消耗するので
、電極の初期の長さは、電極が複数の穴が加工できるよ
うに被加工体の厚さより長いものが使用され、被加工体
を貫通できなくなると交換する。(Prior art) In small-hole electrical discharge machining, a pipe-shaped electrode in the shape of a thin rod with a predetermined length is used, and machining fluid is jetted through the inside of the electrode into the machining part, and the spouted machining fluid is used in the machining hole. Machining is performed while flowing out machining waste together with the machining debris from the gap between the inner wall and the outer periphery of the electrode. Since the electrode wears out as machining progresses, the initial length of the electrode is longer than the thickness of the workpiece so that multiple holes can be machined, and the electrode cannot penetrate the workpiece. exchange with.
(発明が解決しようとする課題)
この細穴放電加工においては、電極は細径であるために
剛性が無く、このため、加工穴の真直性は、その電極で
加工した穴内部の加工液圧と放電加工の際の放電の圧力
とのバランスにより保たれる。従って、1つの貫通細穴
の加工途中に電極が消耗して短くなり、貫通できなくな
って電極を交換すると、前記バランス状態が変化し、一
定に保たれないために、加工精度が低下するという問題
点があった。(Problem to be solved by the invention) In this small-hole electrical discharge machining, the electrode has a small diameter and therefore lacks rigidity. Therefore, the straightness of the machined hole depends on the machining fluid pressure inside the hole machined with the electrode. This is maintained by a balance between the pressure of the electric discharge during electric discharge machining, and the pressure of the electric discharge during electric discharge machining. Therefore, if the electrode wears out and becomes short during the machining of one through-hole, and the electrode cannot be penetrated anymore and the electrode is replaced, the balance state changes and cannot be kept constant, resulting in a decrease in machining accuracy. There was a point.
本発明は、上述の問題点に鑑み、電極消耗と交換による
加工精度の低下を防止することが可能となる細穴加工機
を提供することを目的とする。SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a small hole processing machine that can prevent deterioration in processing accuracy due to electrode consumption and replacement.
(課題を解決するための手段)
本発明は、前記目的を達成するため、加工深さ設定手段
と、加工ヘッドに装着された電極の電極消耗比設定手段
と、これらにより設定された加工深さおよび電極消耗比
から必要電極長を演算する演算手段と、電極長検出手段
と、該手段により検出される電極長と前記演算手段によ
り算出される必要電極長とを比較して必要電極長が検出
された電極長より長い場合には、目的とする細穴放電加
工への移行を停止し、逆に算出電極長さが短い場合には
、細穴放電加工を次工程へと移行せしめ、加工を開始さ
せる加工制御手段とを備えたことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a machining depth setting means, an electrode consumption ratio setting means for an electrode attached to a machining head, and a machining depth set by these means. and a calculation means for calculating the required electrode length from the electrode consumption ratio, an electrode length detection means, and the required electrode length is detected by comparing the electrode length detected by the means with the required electrode length calculated by the calculation means. If the calculated electrode length is longer than the calculated electrode length, the transition to the target small hole electrical discharge machining is stopped, and conversely, if the calculated electrode length is shorter, the small hole electrical discharge machining is moved to the next process and the machining is continued. The invention is characterized by comprising a processing control means for starting processing.
(作用)
本発明は、上記構成を有するので、加工開始時に電極の
長さが途中で交換する必要のない長さであるか否かが判
定され、長さが不足する場合には、細穴放電加工開始へ
の移行が自動停止され、自動又は手動の電極交換工程へ
移行することになる。(Function) Since the present invention has the above configuration, it is determined at the start of machining whether the length of the electrode is long enough to eliminate the need to replace it midway through, and if the length is insufficient, the fine hole is The transition to the start of electrical discharge machining is automatically stopped, and the transition to an automatic or manual electrode replacement process is started.
(実施例)
第1図は本発明による細穴放電加工機の一実施例を示す
概略側面図である。第1図において、1は加工台2上に
設置された被加工体、3はカラム、4は該カラム3に沿
ってZ軸モータ5により上下動されるヘッド、6は該ヘ
ッド4に保持された細棒のパイプ電極である。A〜Dは
前記カラム3に一定又は所定の間隔で上下に配設し、ヘ
ッド4との係合、開離により作動するリミットスイッチ
であり、加工開始時においてヘッド4に保持された電極
6の長さをヘッド4の降下位置検出により測定するため
のものである。7は電極6を被加工体1との間に間歇的
な電圧パルスを印加する加工電源、8は電極6の先端が
被加工体1に到達したことを検出する接触又は放電検出
器である。加工液はパイプ状をなす電極6を通して被加
工体1に供給されるが、その加工液系統については示し
ていない。(Embodiment) FIG. 1 is a schematic side view showing an embodiment of a small-hole electric discharge machine according to the present invention. In FIG. 1, 1 is a workpiece placed on a processing table 2, 3 is a column, 4 is a head that is moved up and down by a Z-axis motor 5 along the column 3, and 6 is a workpiece that is held by the head 4. It is a thin rod pipe electrode. A to D are limit switches that are arranged above and below the column 3 at constant or predetermined intervals and are activated by engaging and disengaging from the head 4. This is for measuring the length by detecting the lowered position of the head 4. 7 is a processing power supply that applies intermittent voltage pulses between the electrode 6 and the workpiece 1; 8 is a contact or discharge detector that detects when the tip of the electrode 6 has reached the workpiece 1; The machining fluid is supplied to the workpiece 1 through the pipe-shaped electrode 6, but the machining fluid system is not shown.
第2図は前記リミットスイッチA〜Dを利用して計測さ
れる電極6の長さが、被加工体1を貫通するに必要な長
さを有するか否かを判定する本発明による装置の一例を
示すブロック図である。第2図において、電極の消耗比
δ設定手段10、加工深さW設定手段11は例えばコン
ピュータの入力装置であるキーボードにより実現される
もので、必要電極長Ha演算手段12および比較手段1
3はコンピュータの演算部により実現され、表示手段1
4もコンピュータの演算内容を表示するCRT等の表示
装置か、ランプ等によって実現される。電極長検出手段
15は、前記リミットスイッチA〜Dにより実現される
。FIG. 2 is an example of a device according to the present invention that determines whether the length of the electrode 6 measured using the limit switches A to D has a length necessary to penetrate the workpiece 1. FIG. In FIG. 2, the electrode consumption ratio δ setting means 10 and the machining depth W setting means 11 are realized by, for example, a keyboard, which is an input device of a computer, and the required electrode length Ha calculation means 12 and the comparison means 1
3 is realized by the arithmetic unit of the computer, and the display means 1
4 is also realized by a display device such as a CRT, or a lamp, etc., for displaying the contents of the computer's calculations. The electrode length detection means 15 is realized by the limit switches A to D.
前記必要電極長Ha演算手段12は、使用電極6の消耗
比δと加工深さW(=板厚)とから、次の式により必要
電極長さHaを算出するものである。The required electrode length Ha calculation means 12 calculates the required electrode length Ha from the wear ratio δ of the electrode 6 used and the machining depth W (=plate thickness) using the following formula.
Ha=W×(1+δ)…(1)
比較手段13は、前記演算手段12により求められた必
要電極長Haと、リミットスイッチA〜Dの加工開始時
(接触又は放電検出器8の作動)における作動状態から
求められる電極長Hbとを比較し、必要電極長が不足す
る場合には、その結果を表示手段14により表示し、ま
た、加工制御手段16によりZ軸モータ5や加工電源7
の作動を停止し、又加工液の供給を行なっていた場合に
は加工液の供給を停止し、放電加工工程への移行を停止
する。Ha=W×(1+δ) (1) Comparison means 13 calculates the required electrode length Ha obtained by calculation means 12 and the limit switches A to D at the time of machining start (operation of contact or discharge detector 8). The electrode length Hb determined from the operating state is compared, and if the required electrode length is insufficient, the result is displayed on the display means 14, and the machining control means 16 controls the Z-axis motor 5 and the machining power supply 7.
If machining fluid is being supplied, the machining fluid supply is stopped, and the transition to the electrical discharge machining process is stopped.
そして、電極6交換が自動化されている装置においては
、電極自動交換工程に自動的に移行する。In an apparatus in which the electrode 6 exchange is automated, the process automatically moves to an electrode automatic exchange step.
第1図のリミットスイッチA〜Dの動作と電極6の長さ
の関係および比較手段13の動作について説明する。第
1図に示すように、説明の簡略化のため、各リミットス
イッチA〜D間の間隔Hを等しくし、最低位置のリミッ
トスイッチDと被加工体1までの間隔をΔHとし、この
間隔ΔHが電極長判断の確実性を保証する。加工電源7
により、或は接触又は放電検出器8により電極6と被加
工体1との間に検出条件の電圧パルス或は検出電圧を加
え、電極6を通して被加工体1に加圧噴出させる加工液
は通常その噴出を停止させた状態としてヘッド4をカラ
ム3に沿って下降させ、接触又は放電検出器8により電
極6と被加工体1との間の放電又は軽接触状態等による
電圧変化を検出して、電極6の下端が被加工体1の上面
に達したことが検出されると、この時のリミットスイッ
チA〜Dの動作状態により、電極長検出手段15は電極
長の概略を検出する。例えば、リミットスイッチA〜D
がすべて不作動であれば、電極6の長さは、H×3以上
の長さであり、例えばH=8cmであるとすれば、電極
6の長さは(24cm+ΔH)以上である。The relationship between the operations of the limit switches A to D in FIG. 1 and the length of the electrode 6, and the operation of the comparison means 13 will be explained. As shown in FIG. 1, to simplify the explanation, the intervals H between each limit switch A to D are made equal, and the interval between the lowest position limit switch D and the workpiece 1 is ΔH. guarantees the reliability of electrode length judgment. Processing power supply 7
By applying a voltage pulse or a detection voltage of the detection condition between the electrode 6 and the workpiece 1 by using the contact or discharge detector 8, the machining fluid is normally jetted under pressure to the workpiece 1 through the electrode 6. With the ejection stopped, the head 4 is lowered along the column 3, and the contact or discharge detector 8 detects voltage changes due to discharge or light contact between the electrode 6 and the workpiece 1. When it is detected that the lower end of the electrode 6 has reached the upper surface of the workpiece 1, the electrode length detection means 15 detects the approximate electrode length based on the operating states of the limit switches A to D at this time. For example, limit switches A to D
If all of the electrodes are inoperative, the length of the electrode 6 is at least H×3. For example, if H=8 cm, the length of the electrode 6 is at least (24 cm+ΔH).
例えば、第1図の2点鎖線aに示す位置にヘッド4が下
降したとき、接触又は放電検出器8が作動したとすると
、このときはリミットスイッチA、Bが作動することに
なる。このときの電極6の長さHbはH=8cm+ΔH
以上で16cm+ΔH以下である。For example, if the contact or discharge detector 8 is activated when the head 4 is lowered to the position shown by the two-dot chain line a in FIG. 1, the limit switches A and B will be activated at this time. The length Hb of the electrode 6 at this time is H=8cm+ΔH
The above is 16 cm+ΔH or less.
この場合、(1)式において、加工深さWが例えば10
cm、電極の消耗比が0.5であるとすれば、必要電極
長Haは15cmとなり、Ha>Hbである可能性があ
り、加工途中で電極が貫通できなくなるおそれがあるか
ら、加工を停止し、電極6を新品に交換して加工を行な
う。前記のように、必要電極長が15cmのとき、加工
開始時(接触又は放電検出器8が作動したとき)にリミ
ットスイッチAのみが作動していたとすると、電極長H
bは16cm+ΔH以上であり、必要電極長Ha=15
cm以上であるから、Ha<Hbであって、電極6の交
換は行なわず接触又は放電加工の工程を次へと進め、加
工液の供給を開始する等して加工を開始進行させること
になる。In this case, in equation (1), the machining depth W is, for example, 10
cm, and if the electrode consumption ratio is 0.5, the required electrode length Ha is 15 cm, and there is a possibility that Ha>Hb, and the electrode may not be able to penetrate during processing, so processing will be stopped. Then, replace the electrode 6 with a new one and start processing. As mentioned above, if the required electrode length is 15 cm and only the limit switch A is activated at the start of machining (when the contact or discharge detector 8 is activated), then the electrode length H
b is 16 cm + ΔH or more, and the required electrode length Ha = 15
cm or more, Ha<Hb, and the contact or electrical discharge machining process is proceeded to the next step without replacing the electrode 6, and machining is started and progressed by starting the supply of machining fluid, etc. .
電極6の長さが短いために加工停止を行なう条件を整理
すると、次の通りである。The conditions for stopping processing due to the short length of the electrode 6 are as follows.
条件(1):リミットスイッチAのみオンであるとき、
電極長Hbが24cm+ΔH以下であるから、必要電極
長Ha≧24cmであれば加工を停止する。Condition (1): When only limit switch A is on,
Since the electrode length Hb is less than 24 cm+ΔH, processing is stopped if the required electrode length Ha≧24 cm.
条件(2):リミットスイッチA、Bがオンであるとき
、Ha≧16cmであれば加工を停止する。Condition (2): When limit switches A and B are on, processing is stopped if Ha≧16 cm.
条件(3):リミットスイッチA、B、Cがオンである
とき、Ha≧8cmであれば加工を停止する。Condition (3): When limit switches A, B, and C are on, processing is stopped if Ha≧8 cm.
条件(4):リミットスイッチA〜Dがすべてオンであ
るとき、無条件に次工程に移行して、細穴放電加工を開
始することを停止する。Condition (4): When all of the limit switches A to D are on, the process unconditionally moves to the next process and stops starting the small hole electric discharge machining.
第3図は上述のの動作を説明する流れ図である。FIG. 3 is a flowchart illustrating the above-mentioned operation.
なお、この流れ図の場合は、電極6の先端と被加工体1
表面との所定の近接又は接触状態を検出するのに放電加
工電源7を用い、電極6が被加工体1を貫通加工できる
長さあることが検知された場合には、加工制御手段16
に信号を出力し、加工液の供給を開始させ、ほぼそのま
ま放電加工開始工程に移行し得る場合を示している。In addition, in the case of this flowchart, the tip of the electrode 6 and the workpiece 1
The electric discharge machining power supply 7 is used to detect a predetermined proximity or contact state with the surface, and when it is detected that the electrode 6 has a length that can penetrate the workpiece 1, the machining control means 16
This shows a case in which a signal is output to start the supply of machining fluid, and the process can proceed almost directly to the electric discharge machining start process.
以上の実施例においては、最下部のリミットスイッチD
と被加工体1との間に高低差ΔHを設定したが、種々の
厚さの被加工体1の加工を行なうため、リミットスイッ
チDと被加工体1との高低差が異なる場合も、この高低
差を電極長Hbを求める場合の値に算入することにより
、上記と同じ判定動作が行なえる。In the above embodiment, the lowest limit switch D
Although the height difference ΔH is set between the limit switch D and the workpiece 1, since workpieces 1 of various thicknesses are machined, this difference may also be applied when the height difference between the limit switch D and the workpiece 1 is different. By including the height difference in the value when determining the electrode length Hb, the same determination operation as above can be performed.
また、リミットスイッチA〜Dを用いるのではなく、放
電開始時のヘッド4の位置を、Z軸モータ5に付帯した
回転数検出器20の出力から求めるか、あるいはスケー
ルにより求めるようにしても良い。Furthermore, instead of using limit switches A to D, the position of the head 4 at the time of starting discharge may be determined from the output of the rotation speed detector 20 attached to the Z-axis motor 5, or from a scale. .
その他、本発明の要旨を逸脱しない範囲において、上記
実施例以外に対して種々の変更、付加が可能であること
は云うまでもない。It goes without saying that various other changes and additions can be made to the embodiments described above without departing from the gist of the present invention.
(発明の効果)
本発明によれば、細穴放電加工を行なうに当り、電極が
被加工体を貫通できる長さを有するかが自動的に判定さ
れ、電極長が不足する場合には、当該位置における加工
開始を停止して、電極交換等を行なわせるようにしたの
で、加工途中で電極が被加工体を貫通できなくなる事態
の発生が防止され、真直性のある細穴加工が保証される
。(Effects of the Invention) According to the present invention, when performing small hole electric discharge machining, it is automatically determined whether the electrode has a length that can penetrate the workpiece, and if the electrode length is insufficient, the corresponding Since the start of machining is stopped at this position and the electrode is replaced, etc., it is possible to prevent the electrode from being unable to penetrate the workpiece during machining, and to ensure straight small hole machining. .
第1図は本発明による細穴放電加工機の一実施例を示す
概略側面図、第2図は本発明による電極長の判定装置の
一例を示すブロック図、第3図は第2図の動作を説明す
る流れ図である。
1:被加工体、2:加工台、3:カラム、4:ヘッド、
5:Z軸モータ、6:電極、7:加工電源、8:接触又
は放電検出器、20:回転数検出器特許出願人 ジャパ
ックス株式会社
代理人 弁理士 若田勝一FIG. 1 is a schematic side view showing an embodiment of a small-hole electrical discharge machine according to the present invention, FIG. 2 is a block diagram showing an example of an electrode length determining device according to the present invention, and FIG. 3 is an operation of the one shown in FIG. It is a flow chart explaining. 1: Workpiece, 2: Processing table, 3: Column, 4: Head,
5: Z-axis motor, 6: Electrode, 7: Processing power supply, 8: Contact or discharge detector, 20: Rotation speed detector Patent applicant: Japax Co., Ltd. Agent, Patent attorney Katsuichi Wakata
Claims (1)
より設定された加工深さおよび電極消耗比から必要電極
長を演算する演算手段と、加工ヘッドに装着された電極
の電極長検出手段と、該手段により検出される電極長と
前記演算手段により算出される必要電極長とを比較して
必要電極長が検出された電極長より長い場合に加工開始
を停止する加工制御手段とを備えたことを特徴とする細
穴放電加工機。A machining depth setting means, an electrode consumption ratio setting means, a calculation means for calculating a required electrode length from the machining depth and electrode consumption ratio set by these, and an electrode length detection means for an electrode attached to a machining head. , processing control means that compares the electrode length detected by the means with the required electrode length calculated by the calculation means and stops the start of processing when the required electrode length is longer than the detected electrode length. A small hole electrical discharge machine characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2337762A JP3007911B2 (en) | 1990-11-30 | 1990-11-30 | Small hole electric discharge machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2337762A JP3007911B2 (en) | 1990-11-30 | 1990-11-30 | Small hole electric discharge machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04348816A true JPH04348816A (en) | 1992-12-03 |
JP3007911B2 JP3007911B2 (en) | 2000-02-14 |
Family
ID=18311727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2337762A Expired - Fee Related JP3007911B2 (en) | 1990-11-30 | 1990-11-30 | Small hole electric discharge machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3007911B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103934531A (en) * | 2014-04-29 | 2014-07-23 | 苏州科技学院 | Detection device for through hole of numerical control electric small hole machine |
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EP2881204B1 (en) * | 2012-07-31 | 2018-09-26 | Makino Milling Machine Co., Ltd. | Replacement determination device for electrical discharge machining electrode and replacement determination method |
NO2975327T3 (en) * | 2013-09-18 | 2018-03-10 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103934531A (en) * | 2014-04-29 | 2014-07-23 | 苏州科技学院 | Detection device for through hole of numerical control electric small hole machine |
CN103934531B (en) * | 2014-04-29 | 2015-12-16 | 苏州科技学院 | Numerical control electric machining aperture machine through hole checkout gear |
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