WO1999058279A1 - Procede et appareil d'usinage par etincelage - Google Patents
Procede et appareil d'usinage par etincelage Download PDFInfo
- Publication number
- WO1999058279A1 WO1999058279A1 PCT/JP1999/002412 JP9902412W WO9958279A1 WO 1999058279 A1 WO1999058279 A1 WO 1999058279A1 JP 9902412 W JP9902412 W JP 9902412W WO 9958279 A1 WO9958279 A1 WO 9958279A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- machining
- control amount
- value
- gap
- 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
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
-
- 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
- B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
- B23H7/18—Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece
-
- 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
- B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
- B23H7/16—Electric circuits specially adapted therefor, e.g. power supply for preventing short circuits or other abnormal discharges by altering machining parameters using adaptive control
-
- 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
- B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
- B23H7/20—Electric circuits specially adapted therefor, e.g. power supply for programme-control, e.g. adaptive
-
- 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
- B23H2400/00—Moving mechanisms for tool electrodes
- B23H2400/10—Moving mechanisms for tool electrodes for rotating the electrode
Definitions
- FIG. 16 shows the structure of the machining control system including the conventional gap control system described on pages 88 to 90, for example, in "Electrical Discharge Machining and 100% Utilization" (Technical Review).
- 101 is an electric discharge machining process
- 102 is a machining state discharge unit
- 104 is a target value setting unit
- 105 is a difference signal operation unit
- 106 is a control amount operation unit
- 1 Reference numeral 07 denotes a processing locus setting unit
- reference numeral 108 denotes a rotation condition setting unit
- reference numeral 110 denotes an electrode driving device
- reference numeral 110 denotes a processing pulse condition setting unit
- reference numeral 111 denotes a processing power supply.
- y is the state quantity of the electric discharge machining process 101
- ym is the detected value of the state quantity y detected by the machining state detection unit 102
- r is the machining set by the target value setting unit 104.
- the target value of the state, e is the difference signal obtained from the detected value ym and the target value r from the difference signal calculation unit 105
- Rv is the machining trajectory command value set in the machining trajectory setting unit 107
- Rr Is the rotation command value set in the rotation condition setting unit 108
- Up is the control amount obtained from the difference signal e and the machining trajectory command value RV by the control amount calculation unit 106
- M p is the electrode drive Control amount by device 1 0 9
- Rs is the machining pulse condition command value set in the machining pulse condition setting section 110
- Ms is based on the command value Rs by the machining power supply 111. This is the amount of machining pulse operation that is operated.
- FIG. 17 is a diagram showing the operation of a conventional gap control system.
- the execution of the gap control algorithm is generally performed by software processing by a microcomputer.
- the figure shows the k-th processing.
- S201 is processing of the machining state detection unit 102, and detects the machining state of the electric discharge machining process as, for example, an average voltage between poles ym (k).
- S401 is processing of the difference signal calculation unit 105, and obtains a difference signal e (k) from the target value r of the average voltage and the detected value ym (k).
- S 1701 is a process of the control amount calculation unit 106, and obtains the control amount Up (k) from the processing locus command value Rv set by the processing locus setting unit 107 and the difference signal e (k), and obtains the control amount Up (k) to the electrode driving device 110.
- Kp is the proportional gain
- Ki is the integral gain
- the electrodes are operated by the well-known PI compensation (proportional + integral compensation) so that the detected value ym (k) matches the target value r. .
- Fig. 18 is a diagram showing the power consumption of the machining state detection value in the conventional gap control system, and it can be said that the machining state detected when machining is performed by an electric discharge machine with a conventional gap control system.
- the power spectrum P of the average voltage between poles ym (k) detected by the unit 102 is obtained.
- the peak of the power spectrum can be confirmed on the frequency f have f 2, f 3, which is the rotational peripheral electrode It corresponds to the wave number and its harmonics.
- the eccentricity of the electrode changes the distance between the electrodes, causing disturbance to the inter-electrode control system, causing a problem of lowering the processing speed.
- the machining current is supplied from the machining power supply to the electrode via the power supply brush.However, the fluctuation in the electrical characteristics of the power supply brush caused by the rotation of the electrode causes disturbance to the gap control system. The problem of inviting them occurred.
- the electrode drive device has mechanical resonance, the amount of control to the drive device and the actual movement of the electrode are different, making it impossible to control the distance between the electrodes, making machining unstable and reducing the machining speed. The problem of inviting had arisen. Disclosure of the invention
- the notch frequency is adjusted in accordance with the rotational frequency of the electrode or the mechanical resonance frequency of a drive system for moving and rotating the electrode.
- a fourth electric discharge machining control device includes a machining state detection unit that detects a machining state of a gap, a notch filter unit that filters a detection value of the machining state detection unit with a notch frequency, and a notch filter.
- a difference signal calculator that calculates the difference signal between the output value of the evening part and the set value of the machining state, and a control amount calculation that calculates a control amount that controls the movement of the electrode from the difference signal and the set movement value of the electrode The electrode is moved in a predetermined direction according to the control amount output from the control amount calculation unit and the control amount is output from the control amount calculation unit.
- a fifth electric discharge machining control device includes a notch frequency automatic adjustment unit that adjusts a notch frequency based on a rotation frequency of an electrode or a mechanical resonance frequency of a drive system that moves and rotates the electrode. is there. As a result, disturbance to the inter-electrode control system due to electrode eccentricity and fluctuations in electrical characteristics during electrode rotation can be suppressed. : The processing speed can be improved by maintaining the state.
- a sixth electric discharge machining control device includes a machining state detection unit that detects a machining state of a gap, and a difference signal that calculates a difference signal between a detection value of the machining state detection unit and a set value of the machining state.
- a calculation unit a control amount calculation unit that calculates a control amount for controlling the movement of the electrode based on the difference signal and the set movement value of the electrode, and a correction amount for correcting the eccentric amount during rotation of the electrode
- a control amount correction unit that corrects the control amount from the control amount calculation unit with the correction amount from the correction amount calculation unit; and moves the electrode in a predetermined direction based on the correction control amount output from the control amount correction unit.
- an electrode drive unit for rotating around a rotary fine perpendicular to the surface facing the workpiece.
- FIG. 1 (A) and 1 (B) are block diagrams showing an electric discharge machining control system according to Embodiment 1 of the present invention
- FIG. 2 (A) is a block diagram of a gap control system shown in FIG. 1 (A).
- FIG. 2 (B) is a flow chart showing the operation
- FIG. 2 (B) corresponds to FIG. 2 (A)
- FIG. 3 is a discharge diagram of Embodiment 2 of the present invention.
- FIG. 4 is a block diagram showing a processing control system.
- FIG. 4 is a flowchart showing the operation of the gap control system shown in FIG. 3, and
- FIGS. 5 and 6 are flowcharts showing the operation of another gap control system in the second embodiment of the present invention.
- FIG. 7 is a block diagram showing an electric discharge machining control system which is Embodiment 3 of the present invention
- FIG. 8 is a diagram showing an operation content of automatic adjustment of a notch frequency in Embodiment 3 of the present invention
- FIG. 9 is a block diagram showing the operation of another gap control system according to the third embodiment of the present invention
- FIG. 10 shows the operation of automatic adjustment of the notch frequency in the third embodiment of the present invention.
- FIG. 11 is a block diagram showing an electric discharge machining control system which is Embodiment 4 of the present invention.
- FIG. 12 is a diagram showing a case where an electrode center and an electrode rotation center in Embodiment 4 of the present invention are different from each other.
- FIG. 13 is a diagram showing a different case, and FIG.
- FIG. 13 is an eccentricity observed when the electrode is rotated in Embodiment 4 of the present invention.
- FIG. 14 is a flowchart showing the K-th software processing of the correction calculation unit and the control amount correction unit in FIG. 11, and FIG. 15 is an embodiment of the present invention.
- 5 is a block diagram showing an electric discharge machining control system
- FIG. 16 is a block diagram showing a configuration of a machining control system including a conventional gap control system
- FIG. 17 is a conventional gap control system.
- FIG. 18 is a flow diagram showing the operation of the system
- FIG. 18 is a diagram showing a state of a power spectrum of a processing state detection value in the conventional gap control system.
- FIG. FIG. 5 is a diagram showing a state of a power spectrum of a detected machining state value in another electric discharge machine using a control system.
- FIG. 1 (A) is a diagram showing an electric discharge machining control system which is Embodiment 1 of the present invention.
- 101, 102, 104 to 111 are the same as those shown in the conventional example.
- the meaning of the command value Rv, the rotation condition command value Rr, the control amount Up, the electrode operation amount Mp, the machining pulse condition command value Rs, and the machining pulse operation amount Ms is the same as that shown in the conventional example.
- 103 is a notch filter section
- yf is a notch filter section 103 for the detected value ym.
- FIGS. 1 (A) and 1 (B) are diagram showing the operation of the gap control system shown in FIGS. 1 (A) and 1 (B). The figure shows the k-th software processing when the gap control algorithm is realized by the microphone opening combination.
- S201 is processing of the machining state detection unit 102, and detects the machining state of the electric discharge machining process as, for example, an average voltage ym (k).
- S 202 is the processing of the notch fill evening unit 103, the detection value ym (k) Fill evening F (z 1) Fill evening ring to obtain the signal yf (k) and.
- the filter F ( z_1 ) is composed of one or more filters having notch-fill characteristics.
- the notch frequency of the filter is either one corresponding to the rotation frequency of the electrode, one corresponding to the resonance frequency of the mechanical system of the XYZ axis drive, or one corresponding to the rotation frequency of the electrode and the rotation frequency of the rotation frequency.
- Those corresponding to harmonics, those corresponding to the electrode rotation frequency and the resonance frequency of the mechanical system of the XYZ axis driving device, those corresponding to the electrode rotation frequency, harmonics of the rotation frequency and the resonance of the mechanical system of the XYZ axis driving device Two or more in any of those corresponding to two or more resonance frequencies of the mechanical system of the XYZ axis drive device, corresponding to the frequency.
- S203 is a process of the difference signal calculation unit 105, and obtains a difference signal e (k) from the target value r of the inter-electrode average voltage and the filtered signal yf (k).
- S204 is a process of the control amount calculation unit 106.
- the difference multiplication e (k) is subjected to integration + proportional compensation to obtain a signal u (k), and the signal u (k) is processed by the processing locus setting unit 107.
- the control amount Up (k) is obtained by multiplying the processing locus command value Rv set in Step 2.
- FIG. 3 is a diagram illustrating an electric discharge machining control system according to a second embodiment.
- 101 to 111 are the same as those shown in the first embodiment of the present invention.
- ef is a signal obtained by filtering the difference signal e by the notch filter unit 103.
- FIG. 4 is a diagram showing the operation of the gap control system shown in FIG.
- the figure shows the k-th software processing when the gap control algorithm is realized by a microcomputer.
- S201 is the processing of the processing state detection unit 102, which is the same as that described in the first embodiment.
- S401 is processing of the difference signal calculation unit 105, and obtains a difference signal e (k) from the target value r of the average voltage between the electrodes and the detected value ym (k).
- S402 is the processing of the notch filter evening section 103, in which the difference signal e (k) is filtered by the filter F (z 1 ) to obtain a signal ef (k).
- the filter F (z- 1 ) is composed of one or more filters having a notch filter characteristic.
- S 403 is processing of the control amount calculation unit 106, in which the signal ef (k) is subjected to integration + proportional compensation to obtain a signal u (k), and the signal u (k) is set in the processing locus setting unit 107.
- the control amount Up (k) is obtained by multiplying the processed machining path command value Rv.
- Kp is a proportional gain
- Ki is an integral gain.
- the difference signal e (k) is filtered by the filter F (z " 1 ).
- the control amount Up (k) (up— x (k) as shown in Fig. 5.
- up—y (k), up—z (k)) and then filtering may be performed for each control variable. That is, as shown in S501, fill up is performed for up-X (k), up_y (k), up- ⁇ (k), and up-X (k), up_y (k), up-z
- (k) be the control amount for the XYZ axis drive.
- the filter F (z _1 ) includes one or more filters having a notch fill characteristic.
- the filter may be performed only for the control amount of the axis having resonance.
- S601 in FIG. 6 shows a case where the X fine drive has resonance. Filtering is performed on up (k), and up—xf (k) is set as the control amount for the X-axis drive. I do.
- the filter G (z- 1 ) is composed of one or more filters having a notch filter characteristic.
- FIG. 7 is a diagram illustrating an electric discharge machining control system according to a third embodiment.
- 101, 102, 104 to 111 are the same as those shown in the first embodiment of the present invention.
- M p, machining pulse condition command value R s, and machining pulse manipulated variable M s are the same as those shown in the first embodiment of the present invention.
- 701 is a variable notch filter unit
- 702 is a notch frequency automatic adjustment unit.
- the variable notch filter section 701 realizes a notch filter characteristic having a notch frequency obtained by the automatic notch frequency adjustment section 702, and obtains a signal yf by filtering the detected value ym.
- FIG. 8 shows the k-th software processing in the variable notch filter unit 701 and the notch frequency automatic adjustment unit 702.
- S801 the rotation condition command value Rr set in the rotation condition setting unit 108 and the resonance frequency of the driving device checked in advance are read, and in S802, a notch is performed based on the read information.
- the frequency is obtained, and in S803, the notch frequency of the variable notch fill portion is adjusted based on the notch frequency.
- the notch frequency can be adjusted in response to changes in the rotation conditions, etc., even when the rotation condition changes, and an appropriate filter song can always be realized.
- the notch frequency automatic adjustment unit 702 determines the notch frequency based on the rotation condition command value Rr set by the rotation condition setting unit 108 and the resonance frequency of the driving device checked in advance. , And the notch frequency of the variable notch filter unit is adjusted.As shown in FIG. 9, the automatic notch frequency adjustment unit 901 captures the detected value ym and has the detected value ym. The power spectrum may be obtained, a frequency having a beak in the power spectrum distribution may be obtained, and the notch frequency of the variable notch filter unit may be adjusted based on the frequency. No. FIG. 10 shows the k-th software processing in the variable notch filter unit 701 and the automatic notch frequency adjusting unit 901.
- the detected value ym is fetched.
- the power spectrum of the detected value ym is calculated.
- the frequency having a beak in the power spectrum is obtained.
- the frequency of the variable notch filter portion is adjusted using the frequency as a notch frequency.
- the processing may be performed by a dedicated hardware.
- FIG. 11 is a view showing an electric discharge machining control system which is Embodiment 4 of the present invention.
- 101, 102, 104 to 111 are the same as those shown in the first embodiment of the present invention.
- state quantity y, detection value ym, target value r of machining state, difference signal e, additional trajectory command value Rv, rotation condition command value Rr, control amount Up, electrode operation amount Mp, machining pulse condition The meanings of the command value R s and the machining pulse operation amount M s are the same as those shown in the first embodiment of the present invention.
- reference numeral 1201 denotes a cylindrical electrode having an electrode radius of r_e and an electrode center of Oe (x-Oe, y_0e), and rotates at the rotation center 0 (0, 0).
- r—oe is the distance between the electrode center 0 e and the rotation center 0.
- FIG. 14 is a diagram showing a k-th software process in the correction amount calculation unit 1101 and the control amount correction unit 1102 in FIG.
- the actual eccentricity of the electrode can be measured.Based on the measured value, the eccentricity can be corrected only by changing the signal processing by using a conventional electrode drive device, and the processing during electrode rotation It is possible to stabilize the state. It should be noted that the method of obtaining r-oe and ⁇ is not limited to the above description, and the same correction of the electrode eccentricity can be performed by obtaining other methods.
- Reference numeral 1501 denotes an eccentricity correction driving device, and an electrode operation amount M pc is obtained by adding an electrode operation amount by the electrode operation amount M p by the electrode driving device 109.
- Embodiment 4 The same correction amount calculation unit 111 determines the correction amount Cp, and the correction amount is given as a control amount of the eccentricity correction driving device 1501. That is, apart from the electrode driving device 109, the eccentricity of the electrode is corrected by the eccentricity correction driving device 1501, which can drive the electrode in a relatively minute range in the XY directions.
- the conventional electrode drive device high-speed response is difficult due to the large electrode drive range.
- the eccentricity correction drive device the drive is in a delicate range, and high-speed response is easily realized. Therefore, with the above configuration, even when the electrode is rotated at a high speed, the eccentricity of the electrode can be accurately corrected.
- the conventional gap control system This can be realized relatively easily, since signal processing only for correcting eccentricity may be performed independently of the above signal processing.
- the eccentricity correction drive device is a device that can be driven in a relatively small range in the XY axis direction.
- the electrode drive device and the eccentricity correction drive device have different coordinate axes, those devices can be used. If the coordinate relationship is clear, it is possible to correct the electrode eccentricity without any problem by performing coordinate conversion on the correction amount Cp.
- the present invention is applied to an electric discharge machine and suppresses eccentricity of an electrode during electrode rotation and disturbance to a gap control system caused by mechanical resonance of an electrode drive system, and is effective in improving machining speed by stabilizing machining. is there.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Automation & Control Theory (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99918359A EP1004385B1 (en) | 1998-05-12 | 1999-05-11 | Method and apparatus for electrodischarge machining |
JP55030799A JP3878222B2 (ja) | 1998-05-12 | 1999-05-11 | 放電加工制御方法および放電加工制御装置 |
US09/462,687 US6505091B1 (en) | 1998-05-12 | 1999-11-05 | Method and apparatus for electrodischarge machining |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/128821 | 1998-05-12 | ||
JP12882198 | 1998-05-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999058279A1 true WO1999058279A1 (fr) | 1999-11-18 |
Family
ID=14994259
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/002412 WO1999058279A1 (fr) | 1998-05-12 | 1999-05-11 | Procede et appareil d'usinage par etincelage |
Country Status (6)
Country | Link |
---|---|
US (1) | US6505091B1 (ja) |
EP (1) | EP1004385B1 (ja) |
JP (1) | JP3878222B2 (ja) |
KR (1) | KR100371859B1 (ja) |
TW (1) | TW453926B (ja) |
WO (1) | WO1999058279A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100968659B1 (ko) * | 2008-06-25 | 2010-07-06 | 김윤영 | 억새이쑤시개의 제조장치 |
CH700591B8 (fr) * | 2009-09-09 | 2010-11-30 | Charmilles Technologies | Procédé pour l'usinage de pièces au moyen du fraisage par électroérosion. |
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 |
US9307320B2 (en) * | 2014-07-24 | 2016-04-05 | Harman International Industries, Inc. | Feedback suppression using phase enhanced frequency estimation |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3808646C1 (ja) | 1988-03-15 | 1989-03-23 | Ag Fuer Industrielle Elektronik Agie Losone Bei Locarno, Losone, Ch | |
JPH05293714A (ja) * | 1992-01-07 | 1993-11-09 | Mitsubishi Electric Corp | 放電加工方法及びその装置 |
JPH09248717A (ja) * | 1996-03-12 | 1997-09-22 | Naotake Mori | ワイヤ放電加工機の制御装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55125934A (en) * | 1979-03-22 | 1980-09-29 | Mitsubishi Electric Corp | Wire cut electrical discharge machining apparatus |
US4322595A (en) * | 1980-07-29 | 1982-03-30 | National Research Development Corporation | Arc monitor for electrical discharge machining |
JPH0649253B2 (ja) * | 1988-07-27 | 1994-06-29 | 三菱電機株式会社 | 放電加工装置の電極間距離の制御装置 |
JP3253812B2 (ja) * | 1994-10-17 | 2002-02-04 | 松下電器産業株式会社 | 放電加工装置 |
JP3575087B2 (ja) * | 1994-12-07 | 2004-10-06 | 三菱電機株式会社 | 放電加工装置 |
JP3395431B2 (ja) * | 1995-02-27 | 2003-04-14 | 三菱電機株式会社 | 放電加工方法及びその装置 |
WO1998039128A1 (fr) * | 1997-03-07 | 1998-09-11 | Sodick Co., Ltd. | Systeme et procede d'usinage par decharge pour le decoupage par fil-electrode |
-
1999
- 1999-05-11 EP EP99918359A patent/EP1004385B1/en not_active Expired - Lifetime
- 1999-05-11 KR KR10-2000-7000313A patent/KR100371859B1/ko not_active IP Right Cessation
- 1999-05-11 TW TW088107570A patent/TW453926B/zh not_active IP Right Cessation
- 1999-05-11 WO PCT/JP1999/002412 patent/WO1999058279A1/ja active IP Right Grant
- 1999-05-11 JP JP55030799A patent/JP3878222B2/ja not_active Expired - Fee Related
- 1999-11-05 US US09/462,687 patent/US6505091B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3808646C1 (ja) | 1988-03-15 | 1989-03-23 | Ag Fuer Industrielle Elektronik Agie Losone Bei Locarno, Losone, Ch | |
JPH05293714A (ja) * | 1992-01-07 | 1993-11-09 | Mitsubishi Electric Corp | 放電加工方法及びその装置 |
JPH09248717A (ja) * | 1996-03-12 | 1997-09-22 | Naotake Mori | ワイヤ放電加工機の制御装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1004385A4 |
Also Published As
Publication number | Publication date |
---|---|
EP1004385A1 (en) | 2000-05-31 |
JP3878222B2 (ja) | 2007-02-07 |
EP1004385B1 (en) | 2013-03-13 |
US6505091B1 (en) | 2003-01-07 |
EP1004385A4 (en) | 2007-12-05 |
KR100371859B1 (ko) | 2003-02-12 |
KR20010021750A (ko) | 2001-03-15 |
TW453926B (en) | 2001-09-11 |
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