WO1999044779A1 - Appareil a couper les fils par electroerosion et procede associe - Google Patents
Appareil a couper les fils par electroerosion et procede associe Download PDFInfo
- Publication number
- WO1999044779A1 WO1999044779A1 PCT/JP1999/001033 JP9901033W WO9944779A1 WO 1999044779 A1 WO1999044779 A1 WO 1999044779A1 JP 9901033 W JP9901033 W JP 9901033W WO 9944779 A1 WO9944779 A1 WO 9944779A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tension
- wire
- wire electrode
- value
- generating
- Prior art date
Links
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
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
- B23H7/104—Wire tension control
Definitions
- the present invention provides a wire cut discharge in which a discharge is generated between a wire electrode and a workpiece to apply a work piece while a wire electrode is transported along a wire transport path in a state where a predetermined tension is applied. It relates to a processing device.
- the present invention relates to a wire cut discharge device provided with a device for controlling a tension applied to a wire electrode traveling along a wire transport path.
- one of a wire electrode and a workpiece moves relative to the other in the XY plane, and the wire electrode moves in a direction substantially perpendicular to the XY plane between a pair of wire guides.
- a voltage pulse is applied to the gap formed between the wire electrode and the workpiece and a discharge is generated in the gap, thereby processing the workpiece as if it were a yarn.
- Such a wire-cut electric discharge machine is suitable for precision machining.
- a wire electrode having a diameter of 0.01 to 0.3 mm is usually formed by a pair of wires arranged one above the other with respect to the work piece via a wire bobbin via a plurality of pulleys and a device for applying tension to the wires. It is transported to the guide. In addition, the wire electrode is transported to a suitable collection device via a number of plies and wire pick-up devices.
- the wire pulling device is controlled so that the traveling speed of the wire electrode is maintained at a set value.
- the tension applying device is controlled so that the tension applied to the wire electrode becomes a set value.
- the tension of the wire electrode is set in accordance with, for example, the diameter and material of the wire electrode and the type of processing. If the tension is set to a large value, a good straightness of the wire electrode is secured between the pair of wire guides. And excessive tension can cause unwanted wire It may cause disconnection of the electrode.
- An object of the present invention is to provide a wire-cut discharge heating device that reliably maintains the tension of a wire electrode at a set value.
- Another object of the present invention is to provide a wire-cut electric discharge machine which reduces fluctuations in the tension of the wire electrode.
- a wire electric discharge machine includes a device for transporting a wire electrode so that the wire electrode travels along a predetermined transport path, and a servo for applying tension to the traveling wire electrode.
- a motor an NC device that generates a signal indicating the set value of the tension
- a tension detector that detects the tension applied to the wire electrode and generates a signal indicating the detected value, a set value of the tension and the tension.
- a tension control device that corrects a speed command signal for commanding the rotation speed of the servomotor based on the difference between the detected values of the two.
- the notch filter includes two cascade-connected notch filters that block different frequencies. Including.
- the tension control device further includes an unnecessary frequency setting device that sets a minimum value of an unnecessary frequency to one of the two notch filters and sets a maximum value of the unnecessary frequency to the other of the two notch filters. Including.
- wire-cut electric discharge machining method of the present invention for machining a work piece by generating an electric discharge between a wire electrode and a work piece traveling along a transport path in a state where tension is applied by a motor
- FIG. 1 is a diagram illustrating the wire electric discharge machine according to the present invention.
- FIG. 2 is a block diagram illustrating the tension controller of FIG.
- FIG. 3 is a diagram illustrating an example of a cascade-connected notch filter of FIG.
- FIG. 4A is a graph showing the relationship between frequency and gain for a notch filter connected in cascade with an individual notch filter.
- FIG. 4B is a graph showing the relationship between the frequency and the phase shift with respect to the notch filters individually connected to the notch filters.
- FIG. 5 is a flowchart showing the operation of the tension control device of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the wire electrode 1 is connected to a pair of wire guides 7 from a wire bobbin 2 via a number of pulleys 3A, brake pulleys 4A and a tension detector 9 by a wire take-up device 6.
- Transported to The pair of wire guides 7 is designed to move the wire electrode 1 and is movable in the XY plane relative to the workpiece 8.
- the upper wire guide 7 tapers the workpiece 8 To move in the U-V plane parallel to the X-Y plane.
- the workpiece 8 is machined in an area 5 formed between the wire guides 7.
- the wire take-up device 6 further transports the wire electrode 1 to a suitable wire electrode collection device (not shown) via a number of pulleys 3B.
- the wire take-up device 6 includes a pulley 6A arranged on the wire transport path and a motor 6B connected to the pulley 6A.
- a device (not shown) that controls the traveling speed of the wire electrode 1 determines the rotation speed of the motor 6B based on the set value stored in the NC device 10.
- the tension applying device 4 applies tension to the wire electrode 1 traveling between the device 4 and the wire take-up device 6, and the tension maintains the straightness of the wire electrode 1 traveling between the pair of wire guides 7.
- an appropriate set value of the tension is stored in the NC device 10 according to the diameter of the wire electrode 1 and the material and the type of processing.
- the tension applying device 4 includes a brake pulley 4A for applying friction to the wire electrode 1, a servomotor 4B connected to the brake pulley 4A, and a driver circuit 4C.
- a speed detector for detecting the rotation speed of the motor 4B is attached to the servo motor 4B.
- the tension applied to the wire electrode 1 is detected by a tension detector 9 composed of, for example, a strain gauge.
- the output of the tension detector 9 passes through the amplification circuit 11 and the analog-digital converter 12 and is provided to the tension control device 13 as a digital signal TM indicating the tension of the wire electrode 1. Further, the tension control device 13 receives the output signals RUN, TS and SS of the NC device 10.
- the signal RUN is a signal for instructing the traveling of the wire electrode 1, and the tension controller 13 starts its operation when receiving the signal RUN.
- the signals T S and S S indicate a set value of the wire tension and a set value of the wire traveling speed, respectively.
- the tension controller 13 supplies a signal SC for commanding the rotation speed of the servomotor 4B to the driver circuit 4C, and the driver circuit 4C supplies a current corresponding to the signal SC to the servomotor 4B.
- the tension controller 13 receives the signals TS and SS, and outputs a speed command signal indicating the rotation speed of the servomotor 4B. Includes speed command generation circuit 14 to be provided.
- the speed command generation circuit 14 calculates the motor rotation speed necessary to maintain the tension of the wire electrode 1 at the set value.
- the tension controller 13 further includes an adder circuit 15, an amplifier circuit 16, an integrator 17 and an adder circuit 18. These elements modify the speed command signal based on the deviation between the set value and the detected value of the wire tension.
- the adder circuit 15 receives the signals TS and TM and provides a signal TC indicating a deviation between the values.
- the signal TC indicating this deviation is supplied to one input of the adder circuit 18 through the amplifier circuit 16 and further supplied to another input of the adder circuit 18 through the integrator 17.
- the addition circuit 18 corrects the speed command signal supplied from the speed command generation circuit 14 and supplies a signal SC indicating the rotation speed of the servo motor 4B to the driver circuit 4C.
- the tension control device 13, the tension applying device 4, the wire electrode 1, the tension detector 9, the width circuit 11, and the analog-digital converter 12 form a feedback control system having a unique frequency. Constitute.
- This feedback control system resonates with an external force, for example, a force generated by an element such as a pulley provided along the wire transport path. This resonance causes the tension of the wire electrode 1 to fluctuate. As a result of the tension fluctuations, undesirable linear traces extending in the running direction of the wire electrode 1 may be left on the machined surface of the workpiece 8.
- An electric filter device for preventing the resonance frequency of the feedback control system from the output signal TC of the adding circuit 15 in order to suppress such a tension variation caused by resonance is provided in the tension control device 13.
- the electric filter device includes two cascade-connected notch filters 19 and 20 that block a signal having a frequency in a predetermined band.
- notch filters 19 and 20 are configured as cascade connections of digital filters that execute a recursive difference equation, for example, as shown in FIG.
- Digital filters 19 and 20 have four modifiable filter coefficients D1, D2, N1 and N2, respectively, and D1 ', D2', N1 'and N2'.
- the digital filters 19 and 20 can function as notch filters or mouth-pass filters depending on the respective filter coefficients.
- the unnecessary resonance frequency for the feedback control system differs depending on the diameter and material of the wire electrode 1 used.
- the unnecessary resonance frequency also varies depending on the length of the wire transfer path between the tension applying device 4 and the wire take-up device 6.
- the length of the wire transfer path changes, for example, when the upper wire guide 7 of FIG. 1 moves in the UV plane during machining.
- a wire-cut electric discharge machine in which at least one of the devices 4 and 6 does not follow the movement of the pair of wire guides 7, when the pair of wire guides moves relative to the workpiece W in the XY plane.
- the length of this wire transport path changes.
- the applicant determined the relationship between the length of the wire transport path and the resonance frequency by an experiment using a brass wire electrode of 0.20. For the experiment, a wire cut electric discharge machine A500 manufactured by Sodick Co., Ltd. was used. The results are shown below. Length of wire transfer path (mm) Resonance frequency (Hz) Approx. 2600 43.8
- the applicant has cascaded a notch filter 19 that blocks the assumed minimum frequency and a notch filter 20 that blocks the assumed maximum frequency.
- the tension control device 13 further includes an unnecessary frequency setting device 21 that sets the frequency that the electric filter device blocks so that only the unnecessary frequency is blocked by the electric filter device.
- the unnecessary frequency setting device 21 decomposes the signal TM into its frequency components by a fast Fourier transform (FFT), finds the frequency with the largest amplitude when the length of the wire transport path is the maximum, and determines the frequency with the largest amplitude. The frequency that the notch filter 19 rejects accordingly Set several bands.
- FFT fast Fourier transform
- the unnecessary frequency setting device 21 finds the frequency with the largest amplitude when the length of the wire transport path is the shortest, and sets the frequency band to be blocked by the notch filter 20 according to the frequency with the largest amplitude. I do.
- the unnecessary frequency setting device 21 provides a signal indicating four filter coefficients, Dl, D2, N1, and N2, to the notch filter 19, and the four filter coefficients, Dl ', Signals indicating D 2 ′, N 1 ′ and N 2 ′ are provided to notch filter 20.
- the frequency band rejected by the notch filters 19 and 20 is determined by the respective filter coefficients.
- the tension control device 13 further includes a switching circuit 22 that bypasses the notch filters 19 and 20 from the feedback control system until the unnecessary frequency setting device 21 provides an output signal to the notch filters 19 and 20.
- the switching circuit 22 has an input A for receiving the output signal of the notch filter 20 and an input B for receiving the output signal of the adding circuit 15, and according to a command signal of the unnecessary frequency setting device 21, one of the inputs A and B is provided. One is provided to each of the amplifier circuit 16 and the integrator 17.
- step S2 the tension control device 13 starts its operation in response to the signal RUN from the NC device 10.
- step S3 the unnecessary frequency setting device 20 sets the size "n" of the input data to "0", and generates a command signal for instructing the switching circuit 21 to use the input B as an output signal. Notch figure The filter 19 is eliminated from the feedback control system of the wire tension control.
- step S4 the tension control device 13 inputs the signals TM, TS, and SS, and starts processing the signals.
- the speed command generation circuit 14 receives the signals TS and SS and provides a speed command signal indicating the rotation speed of the servomotor 4B. This speed command signal is corrected by the amplified value of the deviation between the set value of the wire tension and the detected value and the integral value of the deviation.
- the adding circuit 18 starts outputting a signal SC indicating the corrected speed command signal.
- the unnecessary frequency setting device 20 inputs the digital signal TM, and collects the data while incrementing the data size “n” representing the wire tension “n” by one in step S5.
- step S6 If the reception of the signal RUN stops in step S6 while the unnecessary frequency setting device 20 collects the data indicating the wire tension, the operation of the tension control device 13 ends.
- step S8 the unnecessary frequency setting device 20 processes the collected data, obtains the natural frequency of the feedback control system, and sets the filter coefficient of the notch filter 19.
- the unnecessary frequency setting device 20 sends a signal indicating this set value to the notch filter 19.
- the NC device 10 moves the wire guide 7 in the XY plane and the UV plane so that the length of the wire transport path is minimized in step S9, the flow proceeds to step S10. .
- step S10 the unnecessary frequency setting device 20 sets the size "n" of the input data to "0" again.
- steps S11 to S14 the unnecessary frequency setting device 20 collects data representing the wire tension again, obtains the natural frequency of the feedback control system, and sets the filter coefficient of the notch filter 20. In this way, when the setting of the filter coefficients of the two notch filters 19 and 20 is completed, the unnecessary frequency setting device 20 causes the switching circuit 21 to use its input A as an output signal in step S15. Command signal for instructing the operation. As a result, a cascade connection of the notch filters 19 and 20 is provided to the feedback control system. The operation of the tension controller 13 continues until the reception of the signal RUN stops in step S16.
- the positions of the two cascade-connected notch filters 19 and 20 are not limited to the embodiment of FIG.
- the cascade may be provided anywhere in the feedback control loop where the speed command signal SC is modified based on the difference between the detected wire tension and the set tension.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99937895A EP1008413B1 (en) | 1998-03-04 | 1999-03-04 | Wire-cut electric spark machining apparatus and method |
DE69942734T DE69942734D1 (de) | 1998-03-04 | 1999-03-04 | Funkenerosionsdrahtschneidvorrichtung und verfahren dafür |
US09/423,224 US6326577B1 (en) | 1998-03-04 | 1999-03-04 | Wire cutting electrical discharge device and method for same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP06947898A JP3883690B2 (ja) | 1998-03-04 | 1998-03-04 | ワイヤ放電加工機のワイヤ電極張力制御装置及びその方法並びに張力制御回路のフィルタの決定及び調整設定方法 |
JP10/69478 | 1998-03-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999044779A1 true WO1999044779A1 (fr) | 1999-09-10 |
Family
ID=13403853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/001033 WO1999044779A1 (fr) | 1998-03-04 | 1999-03-04 | Appareil a couper les fils par electroerosion et procede associe |
Country Status (6)
Country | Link |
---|---|
US (1) | US6326577B1 (ja) |
EP (1) | EP1008413B1 (ja) |
JP (1) | JP3883690B2 (ja) |
CN (1) | CN1110397C (ja) |
DE (1) | DE69942734D1 (ja) |
WO (1) | WO1999044779A1 (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4096945B2 (ja) * | 2002-11-26 | 2008-06-04 | 三菱電機株式会社 | モータの速度制御装置 |
US8299744B2 (en) * | 2009-02-09 | 2012-10-30 | Analog Devices, Inc. | Control techniques for motor driven systems |
US8766565B2 (en) | 2009-02-09 | 2014-07-01 | Analog Devices, Inc. | Control techniques for motor driven systems |
US8907243B2 (en) * | 2009-04-07 | 2014-12-09 | Mitsubishi Electric Corporation | Maintenance system for wire transport system of wire discharge processing machine |
US8633916B2 (en) | 2009-12-10 | 2014-01-21 | Apple, Inc. | Touch pad with force sensors and actuator feedback |
JP5550476B2 (ja) * | 2010-07-13 | 2014-07-16 | 住友重機械工業株式会社 | 適応ノッチフィルタ、及びノッチフィルタのパラメタ調整方法 |
JP5088975B2 (ja) * | 2010-10-19 | 2012-12-05 | 株式会社ソディック | ワイヤ放電加工装置 |
US9010673B2 (en) * | 2011-05-16 | 2015-04-21 | Mitsubishi Electric Corporation | Wire electric discharge machining apparatus |
JP2014200864A (ja) | 2013-04-02 | 2014-10-27 | ファナック株式会社 | ワイヤ電極張力制御機能を有するワイヤ放電加工機 |
JP6169557B2 (ja) * | 2014-12-26 | 2017-07-26 | ファナック株式会社 | 張力監視機能を有するワイヤ放電加工機 |
JP6133917B2 (ja) * | 2015-03-06 | 2017-05-24 | ファナック株式会社 | 張力の検出値を補正する機能を有するワイヤ放電加工機 |
US10646939B2 (en) * | 2016-11-15 | 2020-05-12 | Mitsubishi Electric Corporation | Wire electric discharge machine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02185321A (ja) * | 1989-01-10 | 1990-07-19 | Mitsubishi Electric Corp | ワイヤ放電加工機のワイヤ供給装置 |
JPH05312657A (ja) * | 1992-05-08 | 1993-11-22 | I N R Kenkyusho:Kk | ワイヤ張力測定装置 |
JPH0760552A (ja) * | 1993-08-31 | 1995-03-07 | Makino Milling Mach Co Ltd | ワイヤ放電加工装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4298781A (en) | 1978-06-08 | 1981-11-03 | Inoue-Japax Research Incorporated | Wire-cut electroerosion machine and method of operating same |
JP2692386B2 (ja) * | 1991-01-17 | 1997-12-17 | 三菱電機株式会社 | ワイヤ放電加工装置 |
EP0916440B1 (en) * | 1997-03-07 | 2006-05-10 | Sodick Co., Ltd. | System and method for wire cut discharge machining |
-
1998
- 1998-03-04 JP JP06947898A patent/JP3883690B2/ja not_active Expired - Fee Related
-
1999
- 1999-03-04 CN CN99800140A patent/CN1110397C/zh not_active Expired - Lifetime
- 1999-03-04 WO PCT/JP1999/001033 patent/WO1999044779A1/ja active Application Filing
- 1999-03-04 DE DE69942734T patent/DE69942734D1/de not_active Expired - Lifetime
- 1999-03-04 EP EP99937895A patent/EP1008413B1/en not_active Expired - Lifetime
- 1999-03-04 US US09/423,224 patent/US6326577B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02185321A (ja) * | 1989-01-10 | 1990-07-19 | Mitsubishi Electric Corp | ワイヤ放電加工機のワイヤ供給装置 |
JPH05312657A (ja) * | 1992-05-08 | 1993-11-22 | I N R Kenkyusho:Kk | ワイヤ張力測定装置 |
JPH0760552A (ja) * | 1993-08-31 | 1995-03-07 | Makino Milling Mach Co Ltd | ワイヤ放電加工装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1008413A4 * |
Also Published As
Publication number | Publication date |
---|---|
US6326577B1 (en) | 2001-12-04 |
CN1110397C (zh) | 2003-06-04 |
EP1008413A4 (en) | 2004-06-16 |
DE69942734D1 (de) | 2010-10-21 |
JP3883690B2 (ja) | 2007-02-21 |
CN1256653A (zh) | 2000-06-14 |
EP1008413B1 (en) | 2010-09-08 |
JPH11254240A (ja) | 1999-09-21 |
EP1008413A1 (en) | 2000-06-14 |
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