JP2000084743A5 - - Google Patents

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JP2000084743A5
JP2000084743A5 JP1998270607A JP27060798A JP2000084743A5 JP 2000084743 A5 JP2000084743 A5 JP 2000084743A5 JP 1998270607 A JP1998270607 A JP 1998270607A JP 27060798 A JP27060798 A JP 27060798A JP 2000084743 A5 JP2000084743 A5 JP 2000084743A5
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wire
discharge
wire electrode
corner
relative movement
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【0007】
【課題を解決するための手段】
請求項1に規定する発明は、ワイヤ電極と被加工物との間に間欠的に放電を生ぜしめつつ前記ワイヤ電極と前記被加工物とを予め設定された送り速度で相対移動させて、ファーストカットにおけるコーナ部に加工を施すワイヤカット放電加工方法において、前記コーナ部に到達するまでに前記送り速度を予め設定された送り速度よりも小さくし、前記放電のエネルギが初期の電気加工条件で得られる放電のエネルギよりも小さくなるようにし、少なくとも前記ワイヤ電極に加わる放電反力が前記ワイヤ電極の前記相対移動の方向に対して反対方向になる所定の位置まで前記相対移動させて後、送り速度を次第に前記予め設定された送り速度に戻すと共に前記放電エネルギを前記初期の電気加工条件で得られる放電のエネルギに復帰するように増加させるようにしたものである。
0007
[Means for solving problems]
Invention as defined in claim 1 is intermittently discharged is relatively moved at a preset feed rate while caused between the wire electrode and the workpiece to between the wire electrode and the workpiece, first In the wire-cut discharge processing method in which the corner portion in the cut is processed, the feed speed is made smaller than the preset feed speed by the time the corner portion is reached, and the discharge energy is obtained under the initial electromachining conditions. to be smaller than the energy of the discharge is, after by the relative movement discharge reaction force applied to at least the wire electrode to a predetermined position where the opposite direction the against the direction of relative movement of the wire electrode feed speed Is gradually returned to the preset feed rate and the discharge energy is increased so as to return to the discharge energy obtained under the initial electroprocessing conditions.

このように、コーナ部のコーナ点で、加工電圧パルスを印加して放電加工は継続したままでワイヤ電極の相対送り速度を徐々に初期に設定された相対送り速度より遅くし、或いは一時停止し、また、放電の周波数を低く設定するなどして放電エネルギを初期値より減少させて放電反力を小さくし、更にワイヤ電極の相対送り速度を小さくした状態で放電反力が相対移動方向に対して反対方向になった後に前記相対送り速度と放電エネルギを初期値に復帰させるように放電加工を行なうようしたので、コーナ部の加工形状にずれがほとんど生ぜず、加工形状の精度を大幅に向上させることが可能となる。 In this way, at the corner points of the corner section, the relative feed speed of the wire electrode is gradually slowed down or paused from the initially set relative feed speed while the discharge processing is continued by applying the machining voltage pulse. and the discharge energy by, for example, set low frequency of discharge is decreased from the initial value to reduce the discharge reaction force, discharge reaction force further while reducing the relative feed speed of the wire electrode against the relative movement direction Since the discharge processing is performed so that the relative feed rate and the discharge energy are returned to the initial values after the directions are opposite to each other, there is almost no deviation in the processing shape of the corner portion, and the accuracy of the processing shape is greatly improved. It becomes possible to make it.

すなわち、曲線状のコーナ部にてパルス放電の周波数を低くしてワイヤ電極の相対送り速度も小さくするようにしたので、曲線状コーナ部の加工形状にずれがほとんど生ぜず、加工形状の精度を大幅に向上させることが可能となる。この場合、前記所定の位置は前記ワイヤ電極が前記被加工物に形成される加工溝に挟まれる位置である。また、請求項2に規定するように、前記所定の位置が次の式で表される距離Lだけ前記コーナ点から離れた位置とする。
L=(データC−コーナR) (1/sinθ+1/tanθ)+データD
ただし、データCは前記ワイヤ電極の半径と放電ギャップとの和、コーナRはコーナの半径、θはコーナの角度、データDはワイヤ電極の遅れ量である。
That is, since the pulse discharge frequency is lowered at the curved corner portion to reduce the relative feed rate of the wire electrode, the processed shape of the curved corner portion is hardly deviated, and the accuracy of the processed shape is improved. It can be greatly improved. In this case, the predetermined position is a position where the wire electrode is sandwiched between the machined grooves formed in the work piece. Further, as defined in claim 2 , the predetermined position is set to a position separated from the corner point by a distance L represented by the following equation.
L = (Data C-Corner R) (1 / sinθ + 1 / tanθ) + Data D
However, the data C is the sum of the radius of the wire electrode and the discharge gap, the corner R is the radius of the corner, θ is the angle of the corner, and the data D is the delay amount of the wire electrode.

また、請求項3に規定するように、放電エネルギに関しては、前記放電の休止期間を長くして放電の周波数を減少させることにより前記放電のエネルギが前記初期の電気加工条件で得られる放電のエネルギよりも小さくなるようにする。また、請求項4に規定するように、前記コーナ部がエッジ状のコーナであるときに、前記コーナ点で予め設定された所定時間前記相対移動を停止するようにする。 Further, as defined in claim 3 , with respect to the discharge energy, the discharge energy is obtained under the initial electrical processing conditions by lengthening the discharge pause period and reducing the discharge frequency. Try to be smaller than . Further, as defined in claim 4, when the corner portion is an edge-shaped corner, the relative movement is stopped for a predetermined time preset at the corner point.

以上の各発明において、請求項5に規定するように、前記コーナ部で予め設定された加工液噴流の圧力または流量を小さくするようにし、少なくとも前記所定の位置まで到達した後、前記圧力または流量を次第に前記予め設定された圧力または流量に復帰するように大きくするようにすれば、ワイヤ電極の振動も抑制できるので、一層加工形状の精度を向上させることが可能となる。 In each of the above inventions, as defined in claim 5 , the pressure or flow rate of the machining fluid jet set in advance at the corner portion is reduced, and after reaching at least the predetermined position, the pressure or flow rate is reached. by gradually to increase to return to the preset pressure or flow, the vibration of the wire electrode can be suppressed, it is possible to improve the accuracy of even the machined shape.

また、請求項6及び7に規定する発明は、上記方法発明を実施する装置発明であり、ワイヤ電極と被加工物との間に加工電圧パルスを間欠的に印加する電源装置と、前記ワイヤ電極と前記被加工物とを予め設定された送り速度で相対移動させる相対移動装置とを備えたワイヤカット放電加工装置において、ファーストカットにおけるコーナ部で前記コーナ部に到達するまでに前記送り速度を予め設定された送り速度よりも小さくするようにし、少なくとも前記ワイヤ電極に加わる放電反力が前記ワイヤ電極の前記相対移動の方向に対して反対方向になる所定の位置まで相対移動させて後、前記送り速度を次第に予め設定された送り速度に戻すように前記相対移動装置を制御する相対移動制御装置と、前記コーナ部に到達するまでに前記加工電圧パルスの周波数を初期の周波数よりも低くなるようにし、少なくとも前記ワイヤ電極に加わる放電反力が前記ワイヤ電極の前記相対移動の方向に対して反対方向になる所定の位置に到達して後、前記加工電圧パルスの周波数を次第に前記初期の周波数まで戻すように、前記電源装置を制御するパルス制御装置とを具備するようになっている。 Further, the inventions defined in claims 6 and 7 are device inventions for carrying out the above method invention, the power supply device for intermittently applying a processing voltage pulse between the wire electrode and the workpiece, and the wire electrode. In a wire-cut discharge processing apparatus provided with a relative moving device for relatively moving the workpiece and the workpiece at a preset feed rate, the feed rate is set in advance before reaching the corner portion at the corner portion in the first cut. so as to be smaller than the set feed speed, later moved relative discharge reaction force applied to at least the wire electrode to a predetermined position where the opposite direction the against the direction of relative movement of the wire electrode, said feed The relative movement control device that controls the relative movement device so as to gradually return the speed to the preset feed speed, and the frequency of the processing voltage pulse to be lower than the initial frequency by the time the corner portion is reached. back discharge reaction force applied to at least the wire electrode until the later against the direction of relative movement reaches a predetermined position which is in the opposite direction, of gradually the initial frequency of the machining voltage pulse frequency of the wire electrode As described above, the pulse control device for controlling the power supply device is provided.

次に、ガイド4、6がコーナ点X2に到達してワイヤ電極2の相対送り速度が零になったならば(時刻t1)、加工液の噴流圧力を低く設定すると共に周波数を最小のf4まで小さく設定し、この状態を所定の時間T1だけ維持する。ここでは、ワイヤ電極2に不要な振動が発生することを防止するために噴流圧力も最小値に設定している。これにより、加工エネルギは最小値に落とされ、この所定の時間T1の期間で、図12及び図13を参照して説明したようにワイヤ電極2と被加工物Wとの間は放電が行われてワイヤ電極2の撓みが取り除かれ、加工中心部のワイヤ電極2はガイド4の直下に位置する(図13参照)。すなわち、図2においては加工中心部のワイヤ電極2は撓みが取り除かれて点X2に到達することになる。 Next, when the guides 4 and 6 reach the corner point X2 and the relative feed rate of the wire electrode 2 becomes zero (time t1), the jet pressure of the machining fluid is set low and the frequency is set to the minimum f4. It is set small and this state is maintained for a predetermined time T1. Here, the jet pressure is also set to the minimum value in order to prevent unnecessary vibration from being generated in the wire electrode 2. As a result, the processing energy is reduced to the minimum value, and during this predetermined time T1, electric discharge is performed between the wire electrode 2 and the workpiece W as described with reference to FIGS. 12 and 13. The bending of the wire electrode 2 is removed, and the wire electrode 2 at the center of processing is located directly below the guide 4 (see FIG. 13). That is, in FIG. 2, the wire electrode 2 at the center of processing is freed from bending and reaches the point X2.

上記実施例では加工進行方向が鋭角状、直角状或いは鈍角状に屈曲するエッジ状コーナ部54を加工する場合を例にとって説明したが、例えば加工軌跡が半径Rの円弧形状となる曲線状コーナ部を加工する場合にも適用することができる。図8は半径Rの曲線状コーナ部56を加工する時の加工軌跡を示す図、図9は図8に示すコーナ部を加工する時の加工液の噴流圧力と、ワイヤ電極2の相対送り速度と、電圧パルスの周波数の関係を示す図である。図8に示すように点X11〜点X13が半径Rの円弧形状となっており(エッジ状のコーナと異なり、加工プログラムで形成される)、ここでは加工軌跡に角部が存在しないことから、図3中の時刻t1〜t2間の相対移動を停止する状態が存在しない加工方法が採用されることになる。すなわち、ワイヤ電極2の位置が、曲線状コーナ部56に進入する直前の点X10に到達したならば、ワイヤ電極2の相対送り速度(図9(B)参照)を次第に低下させて点X11まで到る。ただし、この実施例の場合には、図3に示す場合と異なり、上述の通り相対送り速度を零にはしないし、また、加工液の噴流圧力を設定値に維持し、更に電圧パルスの周波数を設定値f0に維持する。

In the above embodiment, the case of machining the edge-shaped corner portion 54 whose machining progress direction is bent at an acute-angled shape, a right-angled shape, or an obtuse-angled shape has been described as an example. It can also be applied when processing. FIG. 8 is a diagram showing a processing locus when processing a curved corner portion 56 having a radius R, and FIG. 9 is a diagram showing a jet pressure of a processing liquid when processing a corner portion shown in FIG. 8 and a relative feed rate of the wire electrode 2. It is a figure which shows the relationship of the frequency of a voltage pulse. As shown in FIG. 8, points X11 to X13 have an arc shape with a radius R (unlike edge-shaped corners, they are formed by a machining program), and since there are no corners in the machining locus here, there are no corners. A processing method in which there is no state in which the relative movement between the times t1 to t2 in FIG. 3 is stopped is adopted. That is, when the position of the wire electrode 2 reaches the point X10 immediately before entering the curved corner portion 56, the relative feed rate of the wire electrode 2 (see FIG. 9B) is gradually reduced to the point X11. To arrive. However, in the case of this embodiment, unlike the case shown in FIG. 3, the relative feed rate is not set to zero as described above, the jet pressure of the machining fluid is maintained at the set value, and the frequency of the voltage pulse is further increased. Is maintained at the set value f0.

Claims (7)

ワイヤ電極と被加工物との間に間欠的に放電を生ぜしめつつ前記ワイヤ電極と前記被加工物とを予め設定された送り速度で相対移動させて、ファーストカットにおけるコーナ部に加工を施すワイヤカット放電加工方法において、前記コーナ部に到達するまでに前記送り速度を予め設定された送り速度よりも次第に小さくし、前記放電のエネルギが初期の電気加工条件で得られる放電のエネルギよりも小さくなるようにし、少なくとも前記ワイヤ電極に加わる放電反力が前記ワイヤ電極の前記相対移動の方向に対して反対方向になる所定の位置まで前記ワイヤ電極を相対移動させて後、送り速度を次第に前記予め設定された送り速度に戻すと共に前記放電エネルギを前記初期の電気加工条件で得られる放電のエネルギに復帰するように増加させるようにしたことを特徴とするワイヤカット放電加工方法。A wire that processes the corner portion in the first cut by causing relative discharge between the wire electrode and the workpiece at a preset feed speed while intermittently generating discharge between the wire electrode and the workpiece. In the cut electrical discharge machining method, the feed rate is gradually made smaller than a preset feed rate before reaching the corner portion , and the discharge energy is smaller than the discharge energy obtained under the initial electrical machining conditions. and so on, after by relatively moving the wire electrode discharge reaction force applied to at least the wire electrode to a predetermined position where the opposite direction the against the direction of relative movement of the wire electrode, the preset feed speed gradually And the discharge energy is increased to return to the discharge energy obtained under the initial electromachining conditions. Wire-cut electric discharge machining method being characterized in that as. 前記所定の位置が次の式で表される距離Lだけ前記コーナ点から離れた位置である請求項1に記載のワイヤカット放電加工方法。
L=(データC−コーナR)(1/sinθ+1/tanθ)+データD
ただし、データCは前記ワイヤ電極の半径と放電ギャップとの和、コーナRはコーナの半径、θはコーナの角度、データDはワイヤ電極の遅れ量。
The wire-cut electric discharge machining method according to claim 1, wherein the predetermined position is a position away from the corner point by a distance L represented by the following expression.
L = (data C−corner R) (1 / sin θ + 1 / tan θ) + data D
However, data C is the sum of the radius of the wire electrode and the discharge gap, corner R is the radius of the corner, θ is the angle of the corner, and data D is the delay amount of the wire electrode.
前記放電の休止期間を長くして放電の周波数を減少させることにより前記放電のエネルギが前記初期の電気加工条件で得られる放電のエネルギよりも小さくなるようにしたことを特徴とする請求項1に記載のワイヤカット放電加工方法。 2. The discharge energy is made smaller than the discharge energy obtained under the initial electromachining conditions by increasing the discharge rest period and decreasing the discharge frequency. The wire-cut electric discharge machining method described. 前記コーナ部がエッジ状のコーナであるときに、前記コーナ点で予め設定された所定時間前記相対移動を停止するようにしたことを含む請求項1乃至請求項3に記載のワイヤカット放電加工方法。The wire-cut electric discharge machining method according to any one of claims 1 to 3 , including stopping the relative movement for a predetermined time at the corner point when the corner portion is an edge-shaped corner. . 前記コーナ部で予め設定された加工液噴流の圧力または流量を小さくするようにし、少なくとも前記所定の位置まで到達した後、前記圧力または流量を次第に前記予め設定された圧力または流量に復帰するように大きくするようにしたことを特徴とする請求項1乃至請求項4に記載のワイヤカット放電加工方法。The pressure or flow rate of the machining fluid jet set in advance in the corner portion is reduced, and after reaching at least the predetermined position, the pressure or flow rate is gradually returned to the preset pressure or flow rate. The wire-cut electric discharge machining method according to claim 1 , wherein the wire-cut electric discharge machining method is increased. ワイヤ電極と被加工物との間に加工電圧パルスを間欠的に印加する電源装置と、前記ワイヤ電極と前記被加工物とを予め設定された送り速度で相対移動させる相対移動装置とを備えたワイヤカット放電加工装置において、ファーストカットにおけるコーナ部で前記コーナ部に到達するまでに前記送り速度を予め設定された送り速度よりも次第に小さくするようにし、少なくとも前記ワイヤ電極に加わる放電反力が前記ワイヤ電極の前記相対移動の方向に対して反対方向になる所定の位置まで相対移動させて後、前記送り速度を次第に予め設定された送り速度に戻すように前記相対移動装置を制御する相対移動制御装置と、前記コーナ部に到達するまでに前記加工電圧パルスの周波数を初期の周波数よりも低くなるようにし、少なくとも前記ワイヤ電極に加わる放電反力が前記ワイヤ電極の前記相対移動の方向に対して反対方向になる所定の位置に到達して後、前記加工電圧パルスの周波数を次第に前記初期の周波数まで戻すように、前記電源装置を制御するパルス制御装置とを具備したワイヤカット放電加工装置。A power supply device that intermittently applies a machining voltage pulse between the wire electrode and the workpiece, and a relative movement device that relatively moves the wire electrode and the workpiece at a preset feed speed. In the wire cut electric discharge machining apparatus, the feed rate is gradually made smaller than a preset feed rate before reaching the corner portion at the corner portion in the first cut , and at least the discharge reaction force applied to the wire electrode is after are relatively moved to a predetermined position where the opposite direction against the direction of the relative movement of the wire electrode, the gradually preset relative movement control for controlling the relative movement device back to the feed speed of the feed rate a device, and the frequency of the machining voltage pulses to reach the corner portion so as to be lower than the initial frequency, at least the word After discharge reaction force applied to ya electrode has reached a predetermined position which is in the opposite direction the against the direction of relative movement of the wire electrode, to return to the frequency gradually in the initial frequency of the machining voltage pulses, A wire-cut electric discharge machining apparatus comprising a pulse control device for controlling the power supply device. 前記パルス制御装置が、前記電源装置に含まれる少なくとも1つのスイッチング素子をオンオフするゲートパルスのオフ時間を増減することにより前記加工電圧パルスの周波数を制御する構成を含む請求項6に記載のワイヤカット放電加工装置。The wire cut according to claim 6 , wherein the pulse control device includes a configuration for controlling the frequency of the machining voltage pulse by increasing / decreasing an off time of a gate pulse for turning on / off at least one switching element included in the power supply device. Electric discharge machine.
JP27060798A 1998-09-08 1998-09-08 Wire cut electric discharge machining method and wire cut electric discharge machining apparatus Expired - Fee Related JP4056638B2 (en)

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DE10085280B4 (en) 2000-10-20 2010-06-24 Mitsubishi Denki K.K. Spark erosive wire cutting machine
CH694361A5 (en) * 2000-10-27 2004-12-15 Mitsubishi Electric Corp Method and device for machining by spark erosion with a wire.
JP4015148B2 (en) * 2004-10-28 2007-11-28 ファナック株式会社 Control device for wire electric discharge machine
JP4964485B2 (en) * 2006-04-03 2012-06-27 株式会社ソディック Wire-cut EDM method
JP4693933B2 (en) 2009-07-10 2011-06-01 ファナック株式会社 Control device for wire cut electric discharge machine
CN102615364B (en) * 2012-01-13 2013-07-31 哈尔滨工业大学深圳研究生院 Three-dimensional ultrasonic synergetic modulation micro electrospark wire-electrode cutting machining device
JP5722382B2 (en) * 2013-01-09 2015-05-20 ファナック株式会社 Wire electrical discharge machine that corrects machining path at the corner

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