GB748544A - Improvements relating to apparatus for cutting materials by electric sparks - Google Patents
Improvements relating to apparatus for cutting materials by electric sparksInfo
- 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
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
- B23H7/18—Electric 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.
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)
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)
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)
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. |
-
0
- LU LU31405D patent/LU31405A1/xx unknown
- BE BE510988D patent/BE510988A/xx unknown
-
1952
- 1952-04-07 GB GB8818/52A patent/GB748544A/en not_active Expired
- 1952-04-11 FR FR1062480D patent/FR1062480A/en not_active Expired
- 1952-04-12 DE DEM13725A patent/DE1086362B/en active Pending
Cited By (5)
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 |
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