WO1994003299A1 - Method and apparatus for electrical discharge machining - Google Patents
Method and apparatus for electrical discharge machining Download PDFInfo
- Publication number
- WO1994003299A1 WO1994003299A1 PCT/JP1993/001006 JP9301006W WO9403299A1 WO 1994003299 A1 WO1994003299 A1 WO 1994003299A1 JP 9301006 W JP9301006 W JP 9301006W WO 9403299 A1 WO9403299 A1 WO 9403299A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- machining
- discharge state
- discharge
- conditions
- work
- 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
- B23H7/14—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
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/4093—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part programme, for the NC machine
- G05B19/40937—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part programme, for the NC machine concerning programming of machining or material parameters, pocket machining
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/36—Nc in input of data, input key till input tape
- G05B2219/36103—Adapt, update machining parameters automatically as function of state of processing
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37594—Detect discharge state between electrode and workpiece
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45221—Edm, electrical discharge machining, electroerosion, ecm, chemical
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Definitions
- the present invention relates to an electric discharge machining method for automatically changing machining conditions during machining and an electric discharge machining apparatus for performing the method.
- machining is generally performed according to preset machining conditions. That is, the voltage applied between the electrode and the work, the servo voltage that determines the feed rate of the electrode, the capacity of the capacitor if the device uses a capacitor discharge power supply, and the on / off of the voltage applied between the electrodes Machining conditions including the cutting time and the like are not changed during machining, and the machining is generally performed according to the initially set constant machining conditions.
- a method of performing machining by changing machining conditions according to a discharge state between electrodes during machining is known from, for example, Japanese Patent Publication No. 63-175658.
- the processing method described in this document prepares a table storing several types of data in a storage device and prepares a table based on detection data from a detection device that detects a discharge state.
- data stored in a storage device is selected, an operation is performed on the selected data to determine new processing conditions, and the processing conditions are changed.
- data is selected from the data table of the storage device according to the detected data, and the data is selected based on the selected data. Therefore, the change of the machining condition is limited by the contents of the data table, and the machining condition is changed only stepwise, so that the controllability is not good. Further, if the data to be stored in the table is increased and the processing conditions are changed based on a slight difference in the detected data, not only will the storage capacity of the storage device be squeezed, but also There are problems such as a reduction in processing speed.
- the present invention provides an electric discharge machining method and apparatus in which machining conditions are automatically updated so that detection data representing an electric discharge state coincides with a target value during machining.
- the electric discharge machining method includes an initial machining condition for controlling a discharge state between a machining electrode and a work, a target value of detection data representing the discharge state, and a new machining condition.
- the present invention includes means for performing the above steps.
- the machining conditions are set so that the detection data indicating the electric discharge state matches the target value. Is automatically updated to obtain an optimal discharge state.
- the electric discharge state changes depending on the work material, the work shape, the wire diameter, the gap between the machining fluid supply nozzles, etc., and the optimum machining can be obtained.
- the target value of the above detected data varies depending on the work material, work shape, wire diameter, nozzle gap, and the like. Therefore, prior to the main processing, test processing is performed, and the detection data (average value) from the detecting device when the optimum processing is obtained in the test processing is set as the target value.
- FIG. 1 is a block diagram of an electric discharge machine according to one embodiment of the present invention
- FIG. 2 is a flowchart of a machining condition changing process according to the present invention
- FIG. 3 is a flowchart of a process for obtaining a target value of a discharge state by test machining.
- FIG. 1 is a central processing unit (CPU), 2 is a memory for storing a control program, R 0 M, and 3 is an e-broad program and various setting of processing conditions.
- RAM which stores values and temporarily stores data during various operations, is an input / output interface.
- CPU 1, ROM 2, RAM 3 and I / O interface 4 are connected by bus 5.
- the input / output interface 4 has a manual data input device 6 for inputting various data such as machining conditions, and controls the distance between the wire electrode and the work electrode.
- An electrode distance control device 7, a discharge control device 8 for controlling a discharge state, and a discharge state detection device 9 for detecting a discharge state are connected.
- the inter-electrode distance control device 7, the discharge control device 8, and the discharge state detection device 9 are known from the related art and will not be described in detail.
- CPU 1 follows the control program stored in R 0 M 2, and based on the machining program stored in RAM 3, through input / output interface 4, and controls the gap control device 7. And a machining command including machining conditions is output to the discharge control device 8.
- the gap control device 7 drives a servomotor that relatively moves the electrodes at a constant speed set for example in the machining conditions.
- the servo motor is driven so that the average machining voltage between the poles detected by the discharge state detection device 9 matches the set reference voltage.
- the discharge control device 8 outputs a machining pulse between the machining electrode and the work.
- the repetition period T of the discharge of the machining pulse consists of the machining pulse width (discharge time) on and the discharge pause time for insulation recovery of f (off time).
- the operation of this electric discharge machine is the same as that of the conventional electric discharge machine, but in the present invention, during electric discharge machining, machining conditions are sequentially updated according to the electric discharge state.
- the discharge state detection device 9 uses the normal discharge rate (a predetermined time period) as detection data indicating the discharge state between the electrodes.
- the initial machining conditions including the value of off-time and off from the manual data input device 6, the target value of the detection data indicating the discharge state, and constants for calculating new machining conditions.
- the off-time value of the initial machining conditions is Pl
- the target value of the normal discharge rate is P2
- the constant for calculating new machining conditions is P3.
- the control device 7 and the discharge control device 8 read and control the machining conditions and store them in the storage device D which is controlled.
- a machining command is output to the electric discharge control device 8 to start electric discharge machining.
- the CPU 1 resets and starts the timer T in step S4, and waits until the timer T has counted the set time in step S5. .
- the process proceeds to step S6, and the detection data P4 detected by the discharge state detection device 9 is taken into the register E.
- the normal discharge rate detected by the discharge state detection device 9 is taken as the detection data P4. If the insulation recovery between the electrodes is incomplete during EDM, the discharge with incomplete insulation increases and the normal discharge rate decreases. In this example, it is assumed that the detection data P4 is 40%.
- the process returns to step S2, and the processing conditions (off time 110 s) calculated in step S8 are set as new processing conditions in step S2 described above. The following processing will be executed.
- the time force is increased to 100 ⁇ s and then to 110 ⁇ s, which results in a longer discharge pause in the repetition cycle T of the discharge and a recovery of the insulation between the electrodes. Is promoted, and the normal discharge rate rises.
- steps S2 to S8 are repeated during the electric discharge machining, so that the detection data (normal discharge rate) P4 indicating the electric discharge machining state matches the target value P2. Then, the machining conditions are changed in the off-time sequentially and machining is performed. In this way, the off-time value is optimally controlled such that the normal discharge rate becomes the target normal discharge rate.
- the target value of the discharge state detection data is set to a certain value as a value at which optimum machining can be obtained.
- the discharge state changes depending on the work material, the work shape, the wire diameter, the nozzle gap, and the like.
- the target values are also different.
- the normal discharge rate also fluctuates depending on conditions such as a work material, a work shape, a wire diameter, and a nozzle gap, and is not constant.
- the target value is set by performing test processing in advance using the work and the wire electrode to be actually processed.
- processing conditions for obtaining optimum processing are determined and set and stored in the RAM 3.
- a test processing command is input from the manual data input device 6, and the CPU 1 returns to the flow chart shown in FIG. Test program (straight line) Processing).
- step S10 After setting the index i to "1" in step S10, the process proceeds to step S11, and machining is started based on the machining conditions determined above.
- the timer T is reset and started in step S12, and then, in step S13, the timer T waits until the predetermined time is counted.
- the detection data Xi output from the discharge state detection device 9 is read in step S14, and stored in the address i of the RAM3.
- step S15 it is determined whether or not the index i has reached the set value N.
- step S16 the index i is incremented, and the processing of steps S12 to S15 is repeated. Then, when the index i reaches N and N pieces of detected data are obtained, the process proceeds to step S17, where the electric discharge machining is stopped and the small test machining end process is started.
- step S18 the detected data Xl to Xn are added and divided by N to obtain the average value of the detected data.In step S19, this average value is set to the target value P2. Is set to the specified address in RAM 3 and the test processing is completed.
- the target value of the detection data indicating the discharge state is set by the test processing, and if the actual processing is performed after the test processing, the processing shown in FIG. 2 is performed.
- the machining conditions discharge off time in this example
- control is performed so that the detection data output from the discharge state detection device 9 matches the target value.
- the processing condition to be automatically updated is off-time, but other processing conditions may be used.
- other processing conditions such as a duty ratio determined by an on-time and an on-z off-time, a voltage applied between the electrodes, a capacitor capacity, and the like may be used.
- steps S4 and S5 are omitted, and after performing steps S6 to S8 in each cycle, the processing of steps S2 and S3 is performed. You can do it.
- the machining conditions are automatically updated and feedback controlled so that the detected discharge state matches the target discharge state, and machining is always performed under the optimal machining conditions. . Therefore, the discharge state becomes a constant target discharge state and the stability of the discharge increases. In the case of a wire-cut electric discharge machine that fluctuates depending on the target discharge state force, the material of the work, the diameter of the wire electrode, etc. Thus, the above target value is obtained, so that optimal electric discharge machining control can always be performed.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Geometry (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69305970T DE69305970T2 (de) | 1992-07-31 | 1993-07-19 | Verfahren und vorrichtung zum funkenerosionsbearbeiten |
US08/211,153 US5637240A (en) | 1992-07-31 | 1993-07-19 | Electrical discharge machining method and electrical discharge machining apparatus |
EP93916189A EP0606494B1 (en) | 1992-07-31 | 1993-07-19 | Method and apparatus for electrical discharge machining |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22501292 | 1992-07-31 | ||
JP4/225012 | 1992-07-31 | ||
JP4282161A JPH0691435A (ja) | 1992-07-31 | 1992-09-29 | 放電加工機及び放電加工方法 |
JP4/282161 | 1992-09-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994003299A1 true WO1994003299A1 (en) | 1994-02-17 |
Family
ID=26526380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1993/001006 WO1994003299A1 (en) | 1992-07-31 | 1993-07-19 | Method and apparatus for electrical discharge machining |
Country Status (5)
Country | Link |
---|---|
US (1) | US5637240A (ja) |
EP (1) | EP0606494B1 (ja) |
JP (1) | JPH0691435A (ja) |
DE (1) | DE69305970T2 (ja) |
WO (1) | WO1994003299A1 (ja) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4441055C1 (de) * | 1994-11-17 | 1996-03-28 | Agie Ag Fuer Ind Elektronik | Verfahren und Vorrichtung zur Steuerung von Funkenerosionsprozessen |
DE19614201C2 (de) * | 1996-04-10 | 1999-08-12 | Agie Ag Ind Elektronik | Verfahren und Vorrichtung zur Steuerung einer Werkzeugmaschine, insbesondere einer Funkenerosionsmaschine |
US5904865A (en) * | 1997-04-08 | 1999-05-18 | Jariabek; George V. | EDM control by adjusting the on-time power level |
KR100335315B1 (ko) * | 1998-05-13 | 2002-05-09 | 다니구찌 이찌로오, 기타오카 다카시 | 와이어 방전가공기용 수치제어장치 |
DE19950151A1 (de) * | 1999-10-18 | 2001-06-13 | Agie Sa | Prozeßparameteroptimierung beim funkerosiven Bearbeiten |
WO2002034443A1 (fr) * | 2000-10-20 | 2002-05-02 | Mitsubishi Denki Kabushiki Kaisha | Ensemble d'usinage par etincelage a fil-electrode |
DE112004000445B4 (de) * | 2004-03-01 | 2009-07-23 | Mitsubishi Denki K.K. | Vorrichtung zur Bearbeitung eines Werkstücks durch elektrische Entladung |
JP2007069330A (ja) * | 2005-09-08 | 2007-03-22 | Fanuc Ltd | 放電加工装置の加工条件設定方法 |
JP4833197B2 (ja) * | 2006-10-20 | 2011-12-07 | 三菱電機株式会社 | 放電加工機の電源制御装置 |
JP5199440B1 (ja) * | 2011-11-04 | 2013-05-15 | ファナック株式会社 | 放電加工機の加工条件調整装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63318210A (ja) * | 1987-06-18 | 1988-12-27 | Mitsubishi Electric Corp | 放電加工機の制御装置 |
JPH01135421A (ja) * | 1987-11-16 | 1989-05-29 | Fanuc Ltd | ワイヤ放電加工機の加工条件検出方法及び装置 |
JPH01281821A (ja) * | 1988-05-09 | 1989-11-13 | Seibu Electric & Mach Co Ltd | ワイヤ放電加工の制御方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58109224A (ja) * | 1981-12-17 | 1983-06-29 | Fanuc Ltd | ワイヤカツト放電加工方式 |
JPS6130334A (ja) * | 1984-07-17 | 1986-02-12 | Hitachi Seiko Ltd | 放電加工機用加工条件制御装置 |
JPS6284919A (ja) * | 1985-10-08 | 1987-04-18 | Amada Co Ltd | 放電加工装置の加工状態検出方法及びその装置 |
JPS6312727A (ja) * | 1986-06-27 | 1988-01-20 | Nisshinbo Ind Inc | 精紡機の管替装置におけるペツグトレ−の搬送装置 |
JPH07100262B2 (ja) * | 1988-10-07 | 1995-11-01 | 三菱電機株式会社 | 放電加工終了判定方法及びその装置 |
US5200905A (en) * | 1989-08-09 | 1993-04-06 | Mitsubishi Denki K.K. | Electric discharge machining control apparatus |
JPH0419017A (ja) * | 1990-05-11 | 1992-01-23 | Mitsubishi Electric Corp | 加工条件自動設定装置 |
WO1992000826A1 (en) * | 1990-07-13 | 1992-01-23 | Sodick Co., Ltd. | Method and apparatus for generating pulses |
JP3009755B2 (ja) * | 1991-05-24 | 2000-02-14 | 三菱電機株式会社 | 放電加工用加工条件生成装置 |
KR950010256B1 (ko) * | 1991-07-12 | 1995-09-12 | 미쯔비시덴끼 가부시끼가이샤 | 방전 가공 방법 및 그의 장치 |
-
1992
- 1992-09-29 JP JP4282161A patent/JPH0691435A/ja active Pending
-
1993
- 1993-07-19 EP EP93916189A patent/EP0606494B1/en not_active Expired - Lifetime
- 1993-07-19 DE DE69305970T patent/DE69305970T2/de not_active Expired - Fee Related
- 1993-07-19 WO PCT/JP1993/001006 patent/WO1994003299A1/ja active IP Right Grant
- 1993-07-19 US US08/211,153 patent/US5637240A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63318210A (ja) * | 1987-06-18 | 1988-12-27 | Mitsubishi Electric Corp | 放電加工機の制御装置 |
JPH01135421A (ja) * | 1987-11-16 | 1989-05-29 | Fanuc Ltd | ワイヤ放電加工機の加工条件検出方法及び装置 |
JPH01281821A (ja) * | 1988-05-09 | 1989-11-13 | Seibu Electric & Mach Co Ltd | ワイヤ放電加工の制御方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0606494A4 * |
Also Published As
Publication number | Publication date |
---|---|
US5637240A (en) | 1997-06-10 |
DE69305970T2 (de) | 1997-03-06 |
DE69305970D1 (de) | 1996-12-19 |
EP0606494A4 (en) | 1995-01-11 |
EP0606494A1 (en) | 1994-07-20 |
JPH0691435A (ja) | 1994-04-05 |
EP0606494B1 (en) | 1996-11-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Rajurkar et al. | On-line monitor and control for wire breakage in WEDM | |
WO1994003299A1 (en) | Method and apparatus for electrical discharge machining | |
JPS6014655B2 (ja) | ワイヤカット放電加工方法 | |
JP2567262B2 (ja) | ワイヤ放電加工機の加工条件検出方法及び装置 | |
US4700039A (en) | Method and device for controlling the tool electrode in an electrical discharge machine tool | |
JP2682310B2 (ja) | ワイヤ放電加工方法及びその装置 | |
US4527034A (en) | Electrode positioning method and apparatus for NC-EDM | |
US4366360A (en) | Method of and apparatus for determining relative position of a tool member to a workpiece in a machine tool | |
JP2005153128A (ja) | ワイヤ放電加工機における手動送り装置 | |
WO1991004821A1 (en) | Machining condition setting method for wire cut discharge machine | |
WO2005099951A1 (ja) | 形彫放電加工方法および装置 | |
JP3662677B2 (ja) | ワイヤ放電加工機およびワイヤ放電加工方法 | |
JP3213116B2 (ja) | 放電加工方法及び装置 | |
WO1995000277A1 (fr) | Coupe-fil a decharge electrique | |
CA1162989A (en) | Electrical discharge machining power supply circuit | |
JP2750378B2 (ja) | 放電加工装置 | |
JP2558897B2 (ja) | 自動放電加工装置 | |
JP2657325B2 (ja) | ワイヤ放電加工機の制御方法および装置 | |
JPH078456B2 (ja) | 放電加工装置 | |
EP0696488A1 (en) | A power supply apparatus for electrical discharge machining and an electrical discharge interval control method using the power supply apparatus | |
JPH0457619A (ja) | 放電間隙制御装置 | |
JPS6317568B2 (ja) | ||
JPH068051A (ja) | 放電加工方法およびその装置 | |
JPS6347569B2 (ja) | ||
JP2708270B2 (ja) | 放電加工機の制御方法及び装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 08211153 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1993916189 Country of ref document: EP |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 1993916189 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1993916189 Country of ref document: EP |