GB780242A - Improvements in methods and apparatus for cutting electrically conductive materials - Google Patents
Improvements in methods and apparatus for cutting electrically conductive materialsInfo
- Publication number
- GB780242A GB780242A GB1087252A GB1087252A GB780242A GB 780242 A GB780242 A GB 780242A GB 1087252 A GB1087252 A GB 1087252A GB 1087252 A GB1087252 A GB 1087252A GB 780242 A GB780242 A GB 780242A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cutter
- discharge
- spark
- workpiece
- intervals
- 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
- B23H5/00—Combined machining
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
780,242. Removing metal by electro-erosion. SPARCATRON, Ltd. May 19, 1953 [April 30, 1952], No. 10872/52. Addition to 637,872. Class 83 (4). In apparatus for cutting electrically conductive materials comprising a cutter electrode which is maintained in close relation to the workpiece forming the other electrode, a current supply source is included so that electric discharges are continuously produced between the cutter and workpiece which alternate between a spark discharge for evaporating material and an arc discharge for preheating the material and means are provided for flowing fluid through the cutting zone to remove disintegrated material and to cool the zone. The workpiece and electrode may be kept in relative motion and rubbing contact may be maintained, the contact pressure exerted being less than the vapour pressure exerted by the evaporation so that the cutter floats on the vapour. A capacitor may be connected between the cutter and the work to discharge intermittently, each discharge commencing with a spark and terminating.in an arc. Adjustable capacitance may be provided. The circuit is preferably made non- oscillatory by being critically damped or overdamped when the number of discharge periods may be above 5000/sec. The change-over of spark discharge to arc discharge may be caused by impressing an additional intermittent and/or cyclically variable electric motoric force upon the circuit of the cutter and workpiece. The discharges and intervals may be obtained by using a D.C. source and interrupting or diminishing the flow of current during the intervals by including an interrupting device, e.g. a thermionic valve in the circuit. A pilot spark may be used to trigger the spark discharge. As an alternative to the pilot spark the gap between the cutter and the work may be reduced by a vibrating device. The cutter may be made the anode during arcing and the cathode during sparking. An A.C. supply may be provided for sparking and arcing which may be weakened to produce the intervals. D.C. supply is preferable and electronic valve gear is used to effect polarity reversal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1087252A GB780242A (en) | 1952-04-30 | 1952-04-30 | Improvements in methods and apparatus for cutting electrically conductive materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1087252A GB780242A (en) | 1952-04-30 | 1952-04-30 | Improvements in methods and apparatus for cutting electrically conductive materials |
Publications (1)
Publication Number | Publication Date |
---|---|
GB780242A true GB780242A (en) | 1957-07-31 |
Family
ID=9975876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1087252A Expired GB780242A (en) | 1952-04-30 | 1952-04-30 | Improvements in methods and apparatus for cutting electrically conductive materials |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB780242A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1301698B (en) * | 1961-05-23 | 1969-08-21 | Charmilles Sa Ateliers | Circuit arrangement for processing workpieces by spark erosion |
US4098153A (en) * | 1972-02-14 | 1978-07-04 | The Products Engineering Research Association Of Great Britain | Machining method |
-
1952
- 1952-04-30 GB GB1087252A patent/GB780242A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1301698B (en) * | 1961-05-23 | 1969-08-21 | Charmilles Sa Ateliers | Circuit arrangement for processing workpieces by spark erosion |
US4098153A (en) * | 1972-02-14 | 1978-07-04 | The Products Engineering Research Association Of Great Britain | Machining method |
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