GB1388301A - Process and an installation for machining by electro-erosion - Google Patents
Process and an installation for machining by electro-erosionInfo
- Publication number
- GB1388301A GB1388301A GB1303872A GB1303872A GB1388301A GB 1388301 A GB1388301 A GB 1388301A GB 1303872 A GB1303872 A GB 1303872A GB 1303872 A GB1303872 A GB 1303872A GB 1388301 A GB1388301 A GB 1388301A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- voltage
- machining
- signal
- line
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
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
- B23H1/024—Detection of, and response to, abnormal gap conditions, e.g. short circuits
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
1388301 Automatic control of electro-discharge machining ATELIERS DES CHARMILLES SA 21 March 1972 [25 March 1971] 13038/72 Heading G3R In an electro-erosion process, voltage pulses are supplied to a machining gap filled with fluid. The voltage and/or current across the gap are measured, together with the rate of decrease of the voltage, and at least one of the following parameters is automatically controlled: (a) a pulse characteristic, (b) the composition of the machining fluid, (c) the size of the gap. In the arrangement shown, a pulse generator 5 supplies controlled pulses to an electrode 3 spaced from a workpiece 2. The electrode is movable by a servomechanism 4, and the machining gap is filled with fluid, in the form of a dielectric liquid, supplied through a valve 12 from a reservoir 10. The mechanism 4 and valve 12 are both controlled by a circuit 13 which receives signals representing the machining voltage and current on lines 17, 17a and 18, 18a respectively. The circuit 13 also controls the operation of the pulse generator 5 over lines 14a-14f and may energize fault indicator lamps 31-34. The generator 5 includes monostable multivibrators 5a, 5b connected to a switching device 36 which controls a series transistor T 1 in a relay circuit 7. The current may be increased by turning on a parallel transistor T 2 through an AND gate ET1 controlled by the circuit 13. A third transistor T 3 ensures the establishment of discharge current by applying high voltage from a source 6b, under the control of an AND gate ET2. The beginning of the discharge can be detected by a device 5c connected to the multivibrators, and a line 19a receives a pulse when transistor T 1 turns on. The control circuit 13 includes a number of monitoring and comparator circuits, logic circuitry, and output control signal circuits. The monitoring circuits, Figs. 4-9 (not shown) receive current, voltage and timing signals, and use comparator circuits, transistors, field effect transistors and Zener diodes to produce signals indicative of various operating conditions of the machining process. These signals are then combined and distributed to appropriate control circuits connected to the pulse generator, electrode position servo, machining fluid valve, and warning lamps. The functions of the six monitoring circuits are as follows: Circuit IV, Fig. 4 (not shown) detects the presence of abrupt voltage variations during the current pulses. An insufficient rate of such variations causes illumination of lamp 31. Circuit V, Fig. 5 (not shown) responds to voltage variations from one discharge pulse to another, indicating that sparking is occurring at different points on the workpiece. Circuit VI, Fig. 6 (not shown) monitors the pollution level of the machining fluid. High pollution allows conduction through the fluid and prevents sparking. Warning lamp 32 may be energized and a control signal is fed on line 16 to the fluid supply valve 12, Fig. 12 (not shown). Circuit VII, Fig. 7 (not shown) detects the occurrence of a short circuit, illuminating lamp 33, and circuit VIII, Fig. 8 (not shown) monitors the electrode potential between the start of a voltage pulse and the beginning of current flow. Circuit IX, Fig. 9 (not shown) responds to non-operation of the transistor relay circuit 7 by illuminating lamp 34 and producing a signal on line 14f to energize a relay 35 which switches off the power supply. The outputs from monitoring circuits V, VII and VIII are combined in a control circuit, Fig. 10 (not shown) which produces the signal on line 15 to operate the electrode position servo 4. The characteristics of the pulses produced by generator 5 are controlled by signals on lines 14c, 14d, 14e. The pulse duration is determined by the signal on line 14c, connected to the multivibrator 5a and derived from monitoring circuits IV and V through an output circuit, Fig. 15 (not shown). The duration of the discharges is reduced if the rate of arcing is too high. The intervals between successive pulses are determined by the multi-vibrator 5b under the control of the signal on line 14d in such a way that the intervals are increased if a high rate of unsatisfactory pulses occurs. The signal is produced by an output circuit, Fig. 11 (not shown) of the control circuit 13. Finally, logic circuitry, Fig. 3 (not shown) is used to produce a line 14e a signal to cause switching device 36 to interrupt the discharges momentarily.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH440171A CH529607A (en) | 1971-03-25 | 1971-03-25 | Electro-erosion machining process |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1388301A true GB1388301A (en) | 1975-03-26 |
Family
ID=4275450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1303872A Expired GB1388301A (en) | 1971-03-25 | 1972-03-21 | Process and an installation for machining by electro-erosion |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS5645731B1 (en) |
CH (1) | CH529607A (en) |
DE (1) | DE2214485C2 (en) |
FR (1) | FR2131472A5 (en) |
GB (1) | GB1388301A (en) |
IT (1) | IT954522B (en) |
SU (1) | SU820650A3 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4582974A (en) * | 1982-08-02 | 1986-04-15 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge machine including means for detecting abnormal discharge conditions |
GB2166269A (en) * | 1984-08-27 | 1986-04-30 | Amada Co Ltd | A method of and an apparatus for controlling an electric discharge machine |
GB2171822A (en) * | 1984-10-05 | 1986-09-03 | Amada Co Ltd | Method and apparatus for controlling an electric discharge machine |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2243022A1 (en) * | 1972-09-01 | 1974-03-21 | Aeg Elotherm Gmbh | PROCEDURE FOR CHECKING AND INFLUENCING FLUSHING IN THE MACHINING GAP ON SPARK EDM MACHINES, AS WELL AS DEVICE FOR PERFORMING THIS PROCESS |
CH632176A5 (en) * | 1979-12-06 | 1982-09-30 | Charmilles Sa Ateliers | METHOD AND DEVICE FOR MACHINING BY EROSIVE SPARKING. |
JPS5822629A (en) * | 1981-07-31 | 1983-02-10 | Inoue Japax Res Inc | Wire cut electric spark machining apparatus |
RU2486037C2 (en) * | 2011-09-02 | 2013-06-27 | Александр Сергеевич Никиткин | Method of stabilising anode-cathode spacing in spark erosion shaping of grinding wheels by automatic optimising electrode feed controller |
RU2553779C2 (en) * | 2013-10-07 | 2015-06-20 | Федеральное государственное унитарное предприятие федеральный научно-производственный центр "Производственное объединение "Старт" им. М.В. Проценко" (ФГУП ФНПЦ "ПО "Старт" им. М.В. Проценко") | Spark-erosion shaping of grinding wheel with current-conducting binder |
CN106964856B (en) * | 2017-04-26 | 2018-11-23 | 常州工学院 | A kind of method and device preventing the break-through short circuit of Electrolyzed Processing hole |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1299204B (en) * | 1965-01-16 | 1969-07-10 | Aeg Elotherm Gmbh | Circuit arrangement for a spark erosion machine with memoryless generator and checking the machining gap |
US3474216A (en) * | 1967-10-19 | 1969-10-21 | Cincinnati Milling Machine Co | Process efficiency detecting circuit for electrical discharge machining apparatus |
-
1971
- 1971-03-25 CH CH440171A patent/CH529607A/en not_active IP Right Cessation
-
1972
- 1972-03-20 FR FR7209644A patent/FR2131472A5/fr not_active Expired
- 1972-03-21 GB GB1303872A patent/GB1388301A/en not_active Expired
- 1972-03-22 IT IT6791172A patent/IT954522B/en active
- 1972-03-22 SU SU721764871A patent/SU820650A3/en active
- 1972-03-24 JP JP2963872A patent/JPS5645731B1/ja active Pending
- 1972-03-24 DE DE19722214485 patent/DE2214485C2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4582974A (en) * | 1982-08-02 | 1986-04-15 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge machine including means for detecting abnormal discharge conditions |
GB2166269A (en) * | 1984-08-27 | 1986-04-30 | Amada Co Ltd | A method of and an apparatus for controlling an electric discharge machine |
US4673791A (en) * | 1984-08-27 | 1987-06-16 | Amada Company, Limited | Method and apparatus for controlling an electric discharge machine |
GB2171822A (en) * | 1984-10-05 | 1986-09-03 | Amada Co Ltd | Method and apparatus for controlling an electric discharge machine |
Also Published As
Publication number | Publication date |
---|---|
CH529607A (en) | 1972-10-31 |
DE2214485C2 (en) | 1985-01-17 |
SU820650A3 (en) | 1981-04-07 |
DE2214485A1 (en) | 1972-09-28 |
IT954522B (en) | 1973-09-15 |
FR2131472A5 (en) | 1972-11-10 |
JPS5645731B1 (en) | 1981-10-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
PE20 | Patent expired after termination of 20 years |