GB1237875A - Improvements in electrochemical machining - Google Patents

Improvements in electrochemical machining

Info

Publication number
GB1237875A
GB1237875A GB3718967A GB3718967A GB1237875A GB 1237875 A GB1237875 A GB 1237875A GB 3718967 A GB3718967 A GB 3718967A GB 3718967 A GB3718967 A GB 3718967A GB 1237875 A GB1237875 A GB 1237875A
Authority
GB
United Kingdom
Prior art keywords
transistor
machining
workpiece
tool
relay
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
GB3718967A
Inventor
Joseph Mair
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.)
Associated Engineering Ltd
Original Assignee
Associated Engineering Ltd
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 Associated Engineering Ltd filed Critical Associated Engineering Ltd
Priority to GB3718967A priority Critical patent/GB1237875A/en
Publication of GB1237875A publication Critical patent/GB1237875A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/005—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too low isolation resistance, too high load, short-circuit; earth fault
    • 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
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B23H3/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

1,237,875. Electro-machining. ASSOCIATED ENG. Ltd. Oct. 8, 1968 [Aug. 14, 1967], No.37189/67. Heading C7B. [Also in Division H2] Electro-chemical machining apparatus M, e.g. for deburring metal workpieces or shaping metal workpieces, has a test circuit which is operated prior to starting a machining operation to detect any direct or indirect metallic contact between the tool T and workpice W and to prevent operation if such metallic contact is present. The test circuit comprises a transistor TR1 having its base connected to an intermediate point on a potential divider Dl, R1, R2 connected across the supply lines of a low voltage D. C. supply from a transformer T1 and rectifier X1. Normally the transistor TR1 is in its conducting state so that a relay RL is energized, closing its contacts RL/1 in the power supply circuit to the machining apparatus. The workpiece W and tool T are connected across the diode D1 and resistor R1 so that if before starting a machining operation metallic contact exists between the tool and workpiece, the voltage between the base and emitter of the transistor TR1 is reduced causing the transistor to cut-off and the relay RL to release to prevent operation. If the test is satisfactory the transistor remains conducting and a slow-to-operate relay SC opens its contacts C to interrupt the test circuit to the workpiece. The machining current can then be switched on. An indicator lamp may indicate that a fault exists.
GB3718967A 1967-08-14 1967-08-14 Improvements in electrochemical machining Expired GB1237875A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3718967A GB1237875A (en) 1967-08-14 1967-08-14 Improvements in electrochemical machining

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3718967A GB1237875A (en) 1967-08-14 1967-08-14 Improvements in electrochemical machining

Publications (1)

Publication Number Publication Date
GB1237875A true GB1237875A (en) 1971-06-30

Family

ID=10394502

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3718967A Expired GB1237875A (en) 1967-08-14 1967-08-14 Improvements in electrochemical machining

Country Status (1)

Country Link
GB (1) GB1237875A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9212599U1 (en) * 1992-09-18 1992-11-26 Dewert Antriebs- Und Systemtechnik Gmbh & Co. Kg, 4983 Kirchlengern, De

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9212599U1 (en) * 1992-09-18 1992-11-26 Dewert Antriebs- Und Systemtechnik Gmbh & Co. Kg, 4983 Kirchlengern, De

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