WO2002055250A1 - Dispositif et procede d'usinage par etincelage a fil - Google Patents

Dispositif et procede d'usinage par etincelage a fil Download PDF

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Publication number
WO2002055250A1
WO2002055250A1 PCT/JP2001/000215 JP0100215W WO02055250A1 WO 2002055250 A1 WO2002055250 A1 WO 2002055250A1 JP 0100215 W JP0100215 W JP 0100215W WO 02055250 A1 WO02055250 A1 WO 02055250A1
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
electric discharge
machining
wire electrode
wire
Prior art date
Application number
PCT/JP2001/000215
Other languages
English (en)
Japanese (ja)
Inventor
Hiroatsu Kobayashi
Akihiro Goto
Takuji Magara
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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 Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP2001/000215 priority Critical patent/WO2002055250A1/fr
Publication of WO2002055250A1 publication Critical patent/WO2002055250A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/38—Influencing metal working by using specially adapted means not directly involved in the removal of metal, e.g. ultrasonic waves, magnetic fields or laser irradiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02—Wire-cutting

Definitions

  • the present invention relates to an improvement in a wire electric discharge machining method and apparatus for supplying machining power between a wire electrode and a workpiece and processing the workpiece by a discharger.
  • EDM has established a solid position as a machining technology for dies and the like, and has been used extensively in the dies and machining fields of the automobile industry, home appliance industry, semiconductor industry, and so on.
  • Fig. 4 is an explanatory view of the mechanism of electric discharge machining.
  • 1 is an electrode
  • 2 is a workpiece
  • 3 is an arc column
  • 4 is a machining fluid
  • 5 is machining waste generated by electric discharge machining.
  • FIG. 5 is an explanatory view showing an example of a machining process of wire electric discharge machining, in which 1 a is a wire electrode, 2 is a workpiece, 4 a is water as a machining fluid, and 6 is an initial hole.
  • Fig. 5 (a) shows the first cut, which is rough machining
  • Fig. 5 (b) shows the second cut, which is medium finishing after roughing
  • Fig. 5 (c) shows final cutting. A third cut is shown.
  • FIG. 5 (a) shows an example of the first cut processing in which the wire electrode la is passed through the initial hole 6 and the workpiece 2 is penetrated.
  • the surface roughness and precision are finished in the subsequent processing, so not so severe surface roughness and precision are required, and it is important to increase the processing speed especially to improve productivity It is.
  • wire electric discharge machining in order to increase the machining speed, water 4a is blown out between the gaps in order to efficiently discharge machining waste from the gaps.
  • a method of immersing the workpiece 2 by storing the water 4a in a processing tank (not shown) is used. It is required.
  • the working fluid supply means for supplying the working fluid between the poles is used. .
  • machining such as the second cut (FIG. 5 (b)) and the third cut (FIG. 5 (c)) after the first cut (FIG. 5 (a)) is also performed. It is performed in water 4a, which is a processing fluid.
  • a wire electric discharge machining method is a wire electric discharge machining method for machining a workpiece by generating an electric discharge between a wire electrode and a workpiece, and performing rough machining in a machining fluid.
  • a wire electric discharge machining method is a wire electric discharge machining method for machining the workpiece by generating an electric discharge between a wire electrode and the workpiece, wherein the rough machining is performed in a machining fluid.
  • the wire electric discharge machining method according to the present invention performs the heating while controlling the relative high frequency vibration between the wire electrode and the workpiece so as not to be a standing wave.
  • a wire electric discharge machining apparatus electric discharge energy is supplied between a wire electrode and a workpiece by a machining power supply means, and the wire electrode and the workpiece are relatively moved by a positioning means.
  • a wire electric discharge machine for machining the workpiece in the air or in a mist comprising: a high frequency vibration applying means for relatively high frequency vibration of the wire electrode and the workpiece; and And control means for controlling.
  • the high-frequency vibration applying means includes a high-frequency vibrator having at least two degrees of freedom in a direction orthogonal and parallel to the traveling direction of the wire electrode.
  • the high-frequency vibrator is controlled so that the relative high-frequency vibration between the wire electrode and the workpiece does not become a standing wave.
  • the high-frequency vibrator is a direct drive actuator such as a piezoelectric element, a magnetostrictive element, an ultrasonic motor, or a linear motor.
  • wire electric discharge machining method and apparatus are configured as described above, in the finishing machining, machining is performed without intervening machining fluid between the electrodes, and the shape accuracy and surface roughness of the workpiece are reduced. Can be improved.
  • FIG. 1 is an explanatory diagram showing an example of a wire electric discharge machining method according to an embodiment of the present invention.
  • FIG. 2 is an explanatory diagram showing a configuration of the wire electric discharge machine according to the embodiment of the present invention.
  • FIG. 3 is a diagram illustrating a configuration example and a function of a high-frequency vibration applying unit according to the embodiment of the present invention.
  • FIG. 4 is an explanatory view of a mechanism of electric discharge machining.
  • FIG. 5 is an explanatory diagram showing an example of a machining process of wire electric discharge machining.
  • FIG. 1 is an explanatory diagram showing an example of a wire electric discharge machining method according to an embodiment of the present invention.
  • la wire electrode 2 is a workpiece
  • 4a is water as a machining fluid
  • 6 is Initial hole 7 is a gas such as air.
  • Fig. 1 (a) shows the first cut, which is rough machining
  • Fig. 1 (b) shows the second cut, which is finishing machining after rough machining.
  • the names of the power cut and the second cut are for convenience only, and the wire electric discharge machining does not necessarily end in two times. In the case of processing that requires high accuracy for the workpiece, the processing may be performed seven or eight times.
  • the first cut shown in FIG. 1 (a) is a process in which the wire electrode 1a is passed through the initial hole 6 and the workpiece 2 is penetrated.
  • the first cut since the surface roughness and precision are finished in the subsequent processing, not so strict surface roughness and precision are required, and it is important to increase the processing speed especially to improve productivity.
  • Processing is performed with water 4a, which is a processing liquid, interposed between the poles as in FIG.
  • water 4a which is a processing liquid, interposed between the poles as in FIG.
  • machining is performed in the machining fluid even after the first cut, but there are problems such as uncertain transient vibration of the wire electrode as shown in the background art. Not suitable.
  • the present invention improves the shape accuracy and surface roughness of a workpiece by performing processing without intervening machining fluid between the poles in finishing.
  • the processing is performed in the gas 7 instead of the processing fluid 4a. Is what you do.
  • uncertain transient vibration of the wire electrode 1a can be suppressed as described below.
  • the electrostatic force acting on the wire electrode 1a and the workpiece 2 when a voltage is applied between the poles is proportional to the dielectric constant between the poles.
  • the electrostatic force is several tenths (for example, the dielectric constant is the smallest in vacuum, and the About 80 times in vacuum).
  • the vaporizing explosive force due to the discharge is generated by the liquid interposed between the poles, when only the gas 7 exists between the poles, the wire electrode 1a is hardly affected by the vaporizing explosive force. I do not receive it. Therefore, uncertain transient vibration of the wire electrode 1a can be suppressed.
  • aerial wire electric discharge machining is effective for high-precision machining, but there is a problem that the machining speed is slower than that of submerged wire electric discharge machining as shown in the background art.
  • the main reasons for this are that the amount of workpiece removal is reduced due to the elimination of the vaporizing explosive force generated by discharge, as in submerged electric discharge machining. This is because it adheres to the surface of the workpiece and makes the processing unstable.
  • FIG. 2 is an explanatory diagram showing a configuration of a wire electric discharge machine according to an embodiment of the present invention, and shows an example of a configuration capable of realizing aerial wire electric discharge machining as shown in FIG. 1 (b). It is a thing.
  • la is a wire electrode
  • 2 is a workpiece
  • 7 is a gas such as air, oxygen, nitrogen, or an inert gas
  • 8 is a wire pobin
  • 9a and 9b are wire electrodes 1a and a workpiece.
  • 10 is a high frequency vibration applying machine
  • 11 is a capstan roller
  • 12 is a pinch roller
  • 13 is a horizontal surface of the workpiece 2.
  • An X table for driving in the direction (X direction), 14 is a Y table for driving the workpiece 2 in the horizontal direction (Y direction), and 15 is a motor (not shown) for driving the X table 13.
  • X-axis servo amplifier for driving and controlling the evening 16 is a Y-axis servo amplifier for driving and controlling a motor (not shown) that drives the Y table 14, and 17 is a servo amplifier for driving and controlling the high frequency vibration applying actuator 10.
  • Reference numeral 18 denotes processing power supply means, and reference numeral 19 denotes control means.
  • FIG. 3 is an explanatory view of a configuration example and a function of the high-frequency vibration applying means.
  • 10a is a tip engaging member
  • 10Ob and 10c are piezoelectric elements, magnetostrictive elements, Sound wave motor or linear It is a high-frequency vibrator made of a motor or the like.
  • FIG. 3 (b) schematically shows a high-frequency vibration waveform applied to the wire electrode 1a by the high-frequency vibration applying means.
  • the gas supply means 9a and 9b can be realized by, for example, forming a nozzle around the wire electrode la and supplying a pressurized gas. By supplying the pressurized gas between the electrodes, it is possible to prevent the machining chips removed by the discharge from adhering to the wire electrode and the surface of the workpiece. The air discharge machining can be performed in the air without using such gas supply means 9a and 9b.
  • the wire electrode 1a is pinched and pulled by the capstan opening 11 and the pinch roller 12 so that the wire electrode 1a runs, the wire electrode 1a and the workpiece 2 are opposed to each other, and the gas supply means 9a and While supplying gas 7 between the electrode between the wire electrode 1a and the workpiece 2 by 9b, machining power, which is discharge energy, is supplied by the machining power supply means 18 between the poles, and the positioning means X Finish the work 2 by relatively moving the wire electrode 1 a and the work 2 using the table 13 and the Y table 14.
  • the control means 19 controls the relative positioning control of the wire electrode la and the workpiece 2 and the control of the electric machining conditions by the positioning means.
  • the high-frequency vibrators 10b and 10c constituting the high-frequency vibration applying function 10 are driven by the control means 19 through the support amplifier 17 and are driven through the tip engaging member 10a.
  • High frequency vibration is applied to the wire electrode 1a. That is, the wire electrode la is excited by the high-frequency vibrator 10c together with the vibration component (for example, the X direction in the figure) perpendicular to the wire electrode 1a excited by the high-frequency vibrator 10c.
  • a vibration component parallel to a (for example, Z direction in the figure) is also added.
  • the vibration applied to the wire electrode 1 in this manner is not a standing wave, but as shown in FIG.
  • the control means 19 is controlled so that multiple vibrations such that the positions of antinodes and nodes of the vibration mode of the input electrode 1a constantly change are obtained. Therefore, unlike in the case of the standing wave vibration, the processed surface of the workpiece does not have a striped pattern.
  • the high-frequency oscillators 10b and 10c which are the actuators that directly drive the tip engaging member 10a, are used as the high-frequency vibration applying actuator 10, the response is high, and the wire electrode la Even when the material, diameter, wire tension, and the like change, the vibration amplitude, frequency, and the like can be controlled with high accuracy and stability.
  • the gap between the electrodes is smaller than that in the electric discharge machining, and it is difficult to control the amplitude of the wire electrode. Therefore, the direct drive type high frequency vibration applying actuator 10 as described above is used. It is necessary to perform high-precision control.
  • the two-degree-of-freedom actuator consisting of the high-frequency oscillators 10b and 10c is used as the high-frequency oscillator constituting the high-frequency vibration applying actuator 10 has been described.
  • an actuator having three or more degrees of freedom to excite the vibration of the wire electrode in the X direction, the Y direction, and the Z direction may be used.
  • the case where the high frequency vibration is applied to the wire electrode 1a by the high frequency vibration applying means has been described. However, it is sufficient that the wire electrode 1a and the workpiece 2 are relatively high frequency vibrated. Alternatively, high frequency vibration may be applied to the workpiece 2 instead of the wire electrode 1a.
  • the case where the roughing is performed in the working fluid and the finishing is performed in the air has been described. However, the same effect can be obtained when the finishing is performed in the mist. Industrial applicability
  • the wire electric discharge machining method and apparatus according to the present invention are particularly suitable for being used for high precision electric discharge machining.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

L'invention concerne un dispositif d'usinage par étincelage à fil destiné à usiner une pièce à usiner (2) dans des gaz et/ou des vapeurs, par alimentation d'énergie de décharge électrique entre les pôles pour un fil-électrode (1a) et la pièce à usiner (2) à l'aide d'un organe d'alimentation en énergie d'usinage (18) et par déplacement de façon relative, du fil-électrode (1a) et de la pièce à usiner (2) à l'aide d'un organe de positionnement, le dispositif comprenant des organes générateurs de vibrations haute fréquence (10, 17) destinés à installer le fil-électrode (1a) et la pièce à usiner (2) dans une vibration relativement haute fréquence, et un organe de commande (19) destiné à commander ces vibrations haute fréquence. Il est possible d'atteindre une haute précision et une productivité améliorée dans l'usinage par étincelage à fil.
PCT/JP2001/000215 2001-01-16 2001-01-16 Dispositif et procede d'usinage par etincelage a fil WO2002055250A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/000215 WO2002055250A1 (fr) 2001-01-16 2001-01-16 Dispositif et procede d'usinage par etincelage a fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/000215 WO2002055250A1 (fr) 2001-01-16 2001-01-16 Dispositif et procede d'usinage par etincelage a fil

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WO2002055250A1 true WO2002055250A1 (fr) 2002-07-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103551688A (zh) * 2013-10-25 2014-02-05 南京航空航天大学 一种提高电火花高速穿孔加工表面完整性的方法及装置
CN109175550A (zh) * 2018-10-13 2019-01-11 中北大学 电火花加工电蚀产物排出装置
CN109175551A (zh) * 2018-10-13 2019-01-11 中北大学 电火花加工电蚀产物排出方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5676336A (en) * 1979-11-21 1981-06-23 Mitsubishi Electric Corp Wire cut electric spark machining device
JPS5757208B2 (fr) * 1976-08-19 1982-12-03 Inoue Japax Res
JPH09239622A (ja) * 1996-03-02 1997-09-16 Sodick Co Ltd 気中放電加工方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5757208B2 (fr) * 1976-08-19 1982-12-03 Inoue Japax Res
JPS5676336A (en) * 1979-11-21 1981-06-23 Mitsubishi Electric Corp Wire cut electric spark machining device
JPH09239622A (ja) * 1996-03-02 1997-09-16 Sodick Co Ltd 気中放電加工方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Kikai Gijutsu, Vol. 48, No. 5, May 2000 (Tokyo), Masanori KUNIEDA, "Houden Kakou ni Breakthrough wo motarasu Gijutsu Doukou", pages 18-22 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103551688A (zh) * 2013-10-25 2014-02-05 南京航空航天大学 一种提高电火花高速穿孔加工表面完整性的方法及装置
CN103551688B (zh) * 2013-10-25 2016-03-02 南京航空航天大学 一种提高电火花高速穿孔加工表面完整性的方法及装置
CN109175550A (zh) * 2018-10-13 2019-01-11 中北大学 电火花加工电蚀产物排出装置
CN109175551A (zh) * 2018-10-13 2019-01-11 中北大学 电火花加工电蚀产物排出方法

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