DE948802C - Process for material-removing machining of electrically conductive materials by means of electrical spark discharges - Google Patents

Process for material-removing machining of electrically conductive materials by means of electrical spark discharges

Info

Publication number
DE948802C
DE948802C DES36953A DES0036953A DE948802C DE 948802 C DE948802 C DE 948802C DE S36953 A DES36953 A DE S36953A DE S0036953 A DES0036953 A DE S0036953A DE 948802 C DE948802 C DE 948802C
Authority
DE
Germany
Prior art keywords
electrically conductive
conductive materials
spark discharges
removing machining
electrical spark
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
DES36953A
Other languages
German (de)
Inventor
D W Rudorff
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.)
Sparcatron Ltd
Original Assignee
Sparcatron 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 Sparcatron Ltd filed Critical Sparcatron Ltd
Application granted granted Critical
Publication of DE948802C publication Critical patent/DE948802C/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
    • B23H1/08—Working media

Description

Verfahren zum werkstoffabtragenden Bearbeiten elektrisch leitender Werkstoffe durch elektrische Funkenentladungen Die Erfindung betrifft ein Verfahren zum werkstoffabtragenden Bearbeiten elektrisch leitender Stoffe, insbesondere von Hartmetallen, wie Metallkarbide, Werkzeugstähle und nichtrostende Stähle, durch elektrische Funkenentladungen. Zur Ausführung dieses Verfahrens wird eine Einrichtung benutzt, bei der das Werkzeug die eine und das Werkstück die andere Elektrode bildet. Während der Bearbeitung des Werkstückes durch die elektrischen Entladungen, die entweder Funkenentladungen oder ständig mit Lichtbogenentladungen abwechselnde Funkenentladungen sein können, wird ständig ein Kühlmittel mit flüssiger oder gasförmiger Form zwischen den Elektroden hindurchgeleitet, um den bei der Funkenentladung abgetragenen Werkstoff aus dem Arbeitsbereich herauszuwaschen..Process for material-removing machining of electrically conductive ones Materials by means of electrical spark discharges The invention relates to a method for material-removing machining of electrically conductive materials, in particular of Hard metals such as metal carbides, tool steels and stainless steels electrical spark discharges. A facility is used to perform this procedure used in which the tool forms one electrode and the workpiece forms the other. During the machining of the workpiece by the electrical discharges that either spark discharges or spark discharges continuously alternating with arc discharges can be, is constantly a coolant in liquid or gaseous form between passed through the electrodes to the material removed by the spark discharge wash out of the work area ..

Da die bei der Funkenerosion erzeugte Oberflächengüte des Werkstückes sehr stark von der Spannung abhängt und auch die Maßhaltigkeit durch diese beeinflußt wird, darf man praktisch keine höheren Spannungen als zoo bis Zoo Volt benutzen. Um trotz der niedrigen Spannung auch in einem Dielektrikum von höherer Durchschlagspannung Funken zu erhalten, wird ein strömendes ' Mittel verwendet, das feinverteilte, feste Schwebeteilchen, z. B. Metallteilchen, enthält. Diese verzerren durch ihre vom umgebenden Medium verschiedene Dielektrizitätskonstante das elektrische Feld so, daß dessen Spannungsgradient örtlich sehr hohe Werte annimmt, die dann zur Funkenbildung ausreichen.Because the surface quality of the workpiece produced during spark erosion depends very much on the tension and also influences the dimensional accuracy by this you are practically not allowed to use voltages higher than zoo to zoo volts. To, despite the low voltage, also in a dielectric with a higher breakdown voltage To obtain sparks, a 'flowing' medium is used, the finely divided, solid Suspended particles, z. B. metal particles contains. These are distorted by their from the surrounding medium different dielectric constant the electric field so that its voltage gradient locally very high values, which are then sufficient for sparking.

Die Erfindung bezieht sich auf solche Fälle, bei denen das strömende Mittel nicht umläuft, sondern nur einmal an der Bearbeitungsstelle durchläuft, beispielsweise wenn man angefeuchtete Preßluft zum Funkenbohren tiefer Löcher benutzt. Die Erfindung besteht darin, daß dem strömenden flüssigen oder gasförmigen Mittel, das nur einmal an der Bearbeitungsstelle vorbeifließt, vor dem Eintritt zur Bearbeitungssteile feinverteilte Schwebeteilchen zugesetzt werden. Durch diese feiiverteilten Schwebeteilchen wird die Dielek--'tr@itätskonstante des strömenden Mittels herabgrsetzt, das den Zwischenraum zwischen WerkkÜck und Arbeitskante des Werkzeuges anfüllt. -.Dementsprechend wird auch die--zur Erzeugung der Funkenentladungen notwendige Spannung niedriger.The invention relates to such cases in which the flowing Means does not circulate, but only passes through once at the processing point, for example when using humidified compressed air for spark drilling deep holes. The invention consists in that the flowing liquid or gaseous agent that only once flows past the processing point, before entering the processing parts finely divided suspended particles are added. Through these finely divided suspended particles the dielectric constant of the flowing medium is reduced, which the Fills the space between the work piece and the working edge of the tool. -.Accordingly the voltage required to generate the spark discharges also becomes lower.

Claims (1)

PATENTANSPRUCH: Verfahren zum werkstoffabtragenden Bearbeiten elektrisch leitender Werkstoffe durch elektrische Funkenentladungen, bei dem zwischen der zu bearbeitenden Stelle des Werkstückes und der Werkzeugelektrode ein strömendes Mittel hindurchgeleitet wird, dadurch gekennzeichnet, daß dem strömenden flüssigen oder gasförmigen Mittel, das nur einmal an der Bearbeitungsstelle vorbeifließt, vor dem Eintritt zur Bearbeitungsstelle feinverteilte Schwebeteilchen zugesetzt werden. In Betracht gezogene Druckschriften: Zeitschrift »Werkstatt-Technik und Maschinenbau«, I952, Mai, S.22o; schweizerische Patentschrift Nr. 273 4.69. PATENT CLAIM: Process for material-removing machining of electrically conductive materials by means of electrical spark discharges, in which a flowing medium is passed between the point to be processed on the workpiece and the tool electrode, characterized in that the flowing liquid or gaseous medium, which flows past the processing point only once, finely divided suspended particles are added before entering the processing point. Publications considered: magazine "Werkstatt-Technik und Maschinenbau", 1952, May, p.22o; Swiss Patent No. 273 4.69.
DES36953A 1953-01-02 1953-12-25 Process for material-removing machining of electrically conductive materials by means of electrical spark discharges Expired DE948802C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB948802X 1953-01-02

Publications (1)

Publication Number Publication Date
DE948802C true DE948802C (en) 1956-09-20

Family

ID=10767429

Family Applications (1)

Application Number Title Priority Date Filing Date
DES36953A Expired DE948802C (en) 1953-01-02 1953-12-25 Process for material-removing machining of electrically conductive materials by means of electrical spark discharges

Country Status (1)

Country Link
DE (1) DE948802C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1079243B (en) * 1958-12-20 1960-04-07 Philips Patentverwaltung Arrangement for electrical discharge machining with several electrodes
DE1120618B (en) * 1958-10-01 1961-12-28 Charmilles Sa Ateliers Process for electrical discharge machining with electrically conductive particles in the working gap
WO1980000669A1 (en) * 1978-10-05 1980-04-17 Charmilles Sa Ateliers Dielectric liquid and use of this liquid in a machining process by erosive electrical discharges

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1120618B (en) * 1958-10-01 1961-12-28 Charmilles Sa Ateliers Process for electrical discharge machining with electrically conductive particles in the working gap
DE1079243B (en) * 1958-12-20 1960-04-07 Philips Patentverwaltung Arrangement for electrical discharge machining with several electrodes
WO1980000669A1 (en) * 1978-10-05 1980-04-17 Charmilles Sa Ateliers Dielectric liquid and use of this liquid in a machining process by erosive electrical discharges
FR2437908A1 (en) * 1978-10-05 1980-04-30 Charmilles Sa Ateliers DIELECTRIC LIQUID AND USE OF THIS LIQUID IN A PROCESS OF MACHINING BY EROSIVE ELECTRIC SHOCK

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