GB748544A - Improvements relating to apparatus for cutting materials by electric sparks - Google Patents

Improvements relating to apparatus for cutting materials by electric sparks

Info

Publication number
GB748544A
GB748544A GB8818/52A GB881852A GB748544A GB 748544 A GB748544 A GB 748544A GB 8818/52 A GB8818/52 A GB 8818/52A GB 881852 A GB881852 A GB 881852A GB 748544 A GB748544 A GB 748544A
Authority
GB
United Kingdom
Prior art keywords
generator
voltage
impedance
electrode
workpiece
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
GB8818/52A
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.)
Method X Co
Original Assignee
Method X Co
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 Method X Co filed Critical Method X Co
Publication of GB748544A publication Critical patent/GB748544A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23HWORKING 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
    • B23H7/00Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/14Electric circuits specially adapted therefor, e.g. power supply
    • B23H7/18Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece

Abstract

748,544. Automatic electrode control systems. METHOD X CO. April 7, 1952 [July 20, 1951; Nov. 2, 1951], No. 8818/52. Class 38 (4). [Also in Groups XXII and XXXVII] In apparatus for cutting a workpiece 10, Fig. 1, by electric sparks including an electrode 12, a condenser 13, a charging impedance 18, 19 and a direct current generator 17, a reversible motor 22 for adjusting the electrode towards and from the workpiece is supplied by a generator 23 the polarity and voltage of which are responsive to any two of the following parameters : (a) the voltage between the electrode and the workpiece, (b) the voltage across the impedance, and (c) a substantially constant voltage. The generator 23 is driven at constant speed by a motor 24 and may be a dynamoelectric amplifier or an ordinary direct-current generator having two separate opposing field windings 25, 26 which are independently excited by the voltage Ew across the gap and the voltage Ex across the impedance. Potential dividers 27, 28 are included in the circuits of the windings 25, 26 the net magneto-motive force of which determines the polarity and magnitude of the voltage developed by the generator 23. The variation in voltages with gap spacing is shown in Fig. 6, and the apparatus is adjusted so that winding 25 is dominant and the motor 22, which is provided with a continuously-energized field and has its armature connected to the generator 23, feeds the electrode towards the workpiece at a rate which is just sufficient to compensate for erosion. Arc formation or clogging of the gap produces a sharp increase in current in the winding 26 with resulting reversal of the electrode until the arc is extinguished or the gap cleared. One of the potential dividers 27, 28 may be supplied with a constant voltage E by connecting it across the generator 17. Fig. 4 shows a modification in which the voltages proportional to the two parameters are applied in opposition to a single winding 37 one end of which is connected to a rheostat 38 to receive a voltage proportional to that across the impedance while the other is connected to a divider 27 and a generator 39 supplying a constant voltage opposed to that from the impedance. The generator 39 may be omitted and the constant voltage obtained from the generator 17. Specification 748,543, [Group XXII], is referred to.
GB8818/52A 1951-07-20 1952-04-07 Improvements relating to apparatus for cutting materials by electric sparks Expired GB748544A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US748544XA 1951-07-20 1951-07-20

Publications (1)

Publication Number Publication Date
GB748544A true GB748544A (en) 1956-05-02

Family

ID=22122071

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8818/52A Expired GB748544A (en) 1951-07-20 1952-04-07 Improvements relating to apparatus for cutting materials by electric sparks

Country Status (5)

Country Link
BE (1) BE510988A (en)
DE (1) DE1086362B (en)
FR (1) FR1062480A (en)
GB (1) GB748544A (en)
LU (1) LU31405A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903555A (en) * 1957-03-11 1959-09-08 Firth Sterling Inc Electrode position control for spark machining apparatus
US2903557A (en) * 1957-12-26 1959-09-08 Elox Corp Michigan Arc machining with band electrode
US2934631A (en) * 1955-06-30 1960-04-26 Imalis Rose Electrolytic metal shaping
US2982842A (en) * 1957-03-21 1961-05-02 Tuscher Jean Edouard Method for automatically executing cutters and the like shaped parts of revolution through electric erosion
US4667079A (en) * 1983-06-08 1987-05-19 Fanuc Ltd. Electrode retraction control system of electric discharge machine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE538732A (en) * 1954-06-05
BE541079A (en) * 1954-09-10
US2807706A (en) * 1954-10-25 1957-09-24 Cincinnati Milling Machine Co Apparatus for automatic control of electrical discharge machine
US2818491A (en) * 1955-07-13 1957-12-31 Elox Corp Michigan Electrode wear compensation
US2887561A (en) * 1956-06-08 1959-05-19 Firth Sterling Inc Control for spark machining apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE741249C (en) * 1937-09-30 1943-11-08 Aeg Switching arrangement for precise control of the wire feed in automatic arc welding machines
DE741290C (en) * 1938-06-24 1943-11-17 Siemens Ag Arc welding device for alternating current with a consumable electrode that is automatically advanced by a direct current motor according to the arc voltage
US2311462A (en) * 1942-10-16 1943-02-16 Gen Electric Control apparatus
CH247050A (en) * 1945-10-01 1947-02-15 Bbc Brown Boveri & Cie Automatic arc welding device.
GB637793A (en) * 1946-09-24 1950-05-24 Boris Romanovitch Lazarenko A method of working metals and other electro-conductive materials and means for applying same
CH273469A (en) * 1947-04-10 1951-02-15 William Rudorff Dagobert Process for material-removing machining of pieces of electrically conductive material and device for carrying out this process.
CH277390A (en) * 1948-12-27 1951-08-31 Linde Eismasch Ag Circuit arrangement for controlling a welding electrode advance caused by a Leonard unit.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934631A (en) * 1955-06-30 1960-04-26 Imalis Rose Electrolytic metal shaping
US2903555A (en) * 1957-03-11 1959-09-08 Firth Sterling Inc Electrode position control for spark machining apparatus
US2982842A (en) * 1957-03-21 1961-05-02 Tuscher Jean Edouard Method for automatically executing cutters and the like shaped parts of revolution through electric erosion
US2903557A (en) * 1957-12-26 1959-09-08 Elox Corp Michigan Arc machining with band electrode
US4667079A (en) * 1983-06-08 1987-05-19 Fanuc Ltd. Electrode retraction control system of electric discharge machine

Also Published As

Publication number Publication date
DE1086362B (en) 1960-08-04
BE510988A (en)
LU31405A1 (en)
FR1062480A (en) 1954-04-23

Similar Documents

Publication Publication Date Title
GB953061A (en) Electric motor control system
GB748544A (en) Improvements relating to apparatus for cutting materials by electric sparks
US2841686A (en) Automatic control system for the electrode of a spark-cutting apparatus
GB800456A (en) Improvements in or relating to spark machining method and apparatus
GB556773A (en) Improvements in and relating to speed control systems for electric motors
GB559244A (en) Improvements in and relating to electrode feed control apparatus
GB642309A (en) Improvements in and relating to electric motor control
GB698064A (en) Improvements in the high-speed control of electrical machines
GB737029A (en) Improvements relating to apparatus for cutting materials
GB767690A (en) "improvements relating to electric arc welding systems"
GB710278A (en) Improvements relating to electric arc welding apparatus
GB838781A (en) Improvements in electric motor control systems
GB584440A (en) Improvements in and relating to methods of and apparatus for power factor correctionof synchronous motor driven generator sets
GB835734A (en) Improvements in control systems for electric motor equipments
GB708075A (en) Improvements relating to automatic speed control systems for electric motors
GB556016A (en) Improvements in electrical control systems for maintaining predetermined speed relationships between co-operating electric motors
GB584199A (en) Improvements in and relating to electric control systems
GB748853A (en) Improvements relating to speed control of direct-current motors
GB738662A (en) Improvements in exeitation control systems of electric generators
GB671080A (en) Improvements relating to electric motor control systems
GB797393A (en) Improvements in and relating to electric arc furnaces
GB930912A (en) An electro-erosion machine tool
GB741060A (en) Improvements in electric motor control systems
GB721686A (en) Improvements in or relating to electric motor control systems
GB657572A (en) Improvements in or relating to methods and apparatus for attaching armature conductors to commutator segments in dynamo-electric machines