GB1492027A - Electrical discharge machining - Google Patents

Electrical discharge machining

Info

Publication number
GB1492027A
GB1492027A GB2314574A GB2314574A GB1492027A GB 1492027 A GB1492027 A GB 1492027A GB 2314574 A GB2314574 A GB 2314574A GB 2314574 A GB2314574 A GB 2314574A GB 1492027 A GB1492027 A GB 1492027A
Authority
GB
United Kingdom
Prior art keywords
arcing
generator
gap
discharge
occurrence
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
Application number
GB2314574A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Friedrich Deckel AG
Original Assignee
Friedrich Deckel AG
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 Friedrich Deckel AG filed Critical Friedrich Deckel AG
Priority to GB2314574A priority Critical patent/GB1492027A/en
Priority to CH1590274A priority patent/CH585608A5/xx
Priority to FR7439381A priority patent/FR2252900B1/fr
Priority to AT964674A priority patent/AT342161B/en
Priority to HU74SA2723A priority patent/HU175160B/en
Priority to IT54344/74A priority patent/IT1023488B/en
Priority to YU3199/74A priority patent/YU37415B/en
Priority to DD182786A priority patent/DD115445A5/xx
Priority to DE19742457304 priority patent/DE2457304A1/en
Priority to CA215,236A priority patent/CA1033817A/en
Priority to NL7415781A priority patent/NL7415781A/en
Priority to CS829674A priority patent/CS215087B2/en
Priority to BR10160/74A priority patent/BR7410160A/en
Priority to ES432596A priority patent/ES432596A1/en
Priority to SE7415188A priority patent/SE7415188L/
Priority to US05/529,508 priority patent/US4009361A/en
Priority to JP49140103A priority patent/JPS5094596A/ja
Publication of GB1492027A publication Critical patent/GB1492027A/en
Expired legal-status Critical Current

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

1492027 Electro-erosion FRIEDRICH DECKEL AG 4 March 1975 [4 Dec 1973 23 May 1974] 56184/73 and 23145/74 Heading B3V The occurrence of arcing during electrical discharge machining is sensed by detecting the absence of a high frequency component in a discharge across the machining gap and thereupon interrupting the discharges within 20 microseconds. The gap voltage or current W is fed through a filter F whose output is connected via an amplifier A to a comparator circuit C having another input derived from a gap current detector CD. When an HF component, e.g. above 1 MHz, is absent from a discharge indicative of arcing, pulses are not supplied from the filter F to the comparator circuit C, whereupon the pulse generator G is caused to switch off for a predetermined period, e.g. below 2 sees. The electrode may also be withdrawn and the amplitude of the discharges reduced. If arcing occurs too frequently, the generator is switched off and an alarm actuated. If a short is detected across the gap by a circuit S, the discharges are interrupted for a shorter period. To test whether the monitoring circuit is functioning correctly, signals simulating the occurrence of arcing are applied randomly or regularly through contacts T 1 -T 3 whereupon a signal is applied to a gate G 2 whose other input receives a signal from the generator G upon the occurrence of a discharge therefrom. If the generator has not switched off within 20 Ásecs., a signal is supplied to an integrator I which switches it off.
GB2314574A 1973-12-04 1974-05-23 Electrical discharge machining Expired GB1492027A (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
GB2314574A GB1492027A (en) 1974-05-23 1974-05-23 Electrical discharge machining
CH1590274A CH585608A5 (en) 1973-12-04 1974-11-29
FR7439381A FR2252900B1 (en) 1973-12-04 1974-12-02
AT964674A AT342161B (en) 1974-05-23 1974-12-03 DEVICE FOR MONITORING A SPARK EDM MACHINING PROCESS IN SPARK EDM MACHINES
HU74SA2723A HU175160B (en) 1974-05-23 1974-12-03 Equipment for controlling the working process of electric spark machining apparatus
IT54344/74A IT1023488B (en) 1973-12-04 1974-12-03 IMPROVEMENTS IN ELECTRIC DISCHARGE STAIN CLEANING EQUIPMENT
YU3199/74A YU37415B (en) 1973-12-04 1974-12-03 Arrangement for the control of a metal treatment process with electric discharge at machines for processing by means of the erosion method with the aid of electric discharge
DD182786A DD115445A5 (en) 1973-12-04 1974-12-04
DE19742457304 DE2457304A1 (en) 1973-12-04 1974-12-04 METHOD AND DEVICE FOR MONITORING A MACHINING PROCESS USING SPARK EROSION
CA215,236A CA1033817A (en) 1973-12-04 1974-12-04 Electrical discharge machining apparatus
NL7415781A NL7415781A (en) 1973-12-04 1974-12-04 IMPROVEMENTS IN A DEVICE FOR MACHINING VIA ELECTRICAL DISCHARGE.
CS829674A CS215087B2 (en) 1974-05-23 1974-12-04 Connection of the circuit for the control of the erosion machining by electric spark
BR10160/74A BR7410160A (en) 1973-12-04 1974-12-04 PROCESS AND PERFECT APPARATUS OF SUPERVISING AN ELECTROSERATION OPERATION
ES432596A ES432596A1 (en) 1973-12-04 1974-12-04 Electrical discharge machining apparatus with monitoring circuit and means to check the operability of the monitoring circuit
SE7415188A SE7415188L (en) 1973-12-04 1974-12-04
US05/529,508 US4009361A (en) 1973-12-04 1974-12-04 Electrical discharge machining apparatus with monitoring circuit and means to check the operability of the monitoring circuit
JP49140103A JPS5094596A (en) 1973-12-04 1974-12-04

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2314574A GB1492027A (en) 1974-05-23 1974-05-23 Electrical discharge machining

Publications (1)

Publication Number Publication Date
GB1492027A true GB1492027A (en) 1977-11-16

Family

ID=10190893

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2314574A Expired GB1492027A (en) 1973-12-04 1974-05-23 Electrical discharge machining

Country Status (4)

Country Link
AT (1) AT342161B (en)
CS (1) CS215087B2 (en)
GB (1) GB1492027A (en)
HU (1) HU175160B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443680A (en) * 1980-04-02 1984-04-17 El Menshawy Mohamed F Methods and apparatus for electrical discharge machining
US4487671A (en) * 1981-04-15 1984-12-11 National Research Development Corporation Methods and apparatus for the electrical machining of a workpiece

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443680A (en) * 1980-04-02 1984-04-17 El Menshawy Mohamed F Methods and apparatus for electrical discharge machining
US4487671A (en) * 1981-04-15 1984-12-11 National Research Development Corporation Methods and apparatus for the electrical machining of a workpiece

Also Published As

Publication number Publication date
ATA964674A (en) 1977-07-15
CS215087B2 (en) 1982-07-30
AT342161B (en) 1978-03-28
HU175160B (en) 1980-05-28

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee