DE1565262A1 - Circuit arrangement for the protection of devices for electrochemical removal against short circuits - Google Patents

Description

AEG-Elοthere GmbH Remscheid-Hasten Hammesberger Str. 31 j 5 6 5 2 6 2

Remscheid-Hasten, November 13th, 1967 Bö / jn

Circuit arrangement for the protection of devices for electrochemical removal against short circuit

The application relates to a circuit arrangement for the protection of devices for the electrochemical removal of Metals before those that occur in the event of a short circuit in the working section high currents *

In a known way, during electrochemical countersinking and deburring, the workpiece is connected as an anode, ie "connected to the positive electrode, and the tool connected as a cathode, u, h" connected to the negative electrode "Wena simultaneously wi® hm ± m electrochemical removal v © n Metals in general. d ± @ Ärt®ifcβstreck® between the workpiece and the tool is filled with Blekteslyi "for example a K®en" »liBl8euag ₉ , that a direct current of high amperage flows, which caused a material to be removed from the anode

Of ft © borrowed which beispial "as incurred purposes removal of dissolved in the electrolyte solution workpiece during the machining of steel and iron as Fe ₂ ⁰ ^, the electrolyte solution with Help © oinar pump in constant circulation is kept and cooled during the Umlauf® ^ and cleaned. The direct current source mainly consists of a Metz transformer and a refined rectifier.

In the case of electrochemical abrasive machining, in order to maintain a uniform and progressive material removal

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carry ·· a konatantar working gap of a certain size «ingaha.ltan be. Diaa gaaohiaht mostly because the tool electrode is more constant according to the Varkatoff removal on the VarkatUok Gaaohvindigkait is readjusted. Now aa abar can occur during the electrochemical Baarbaitungvorgangaa that friaoha Electrolyte solution not in auaraiohandar Manga daai Arbaitaapalt is supplied odar aina number fainatar Tailohan iai Arbaitaapalt get stuck. In baidan cases, this is the normal removal process hindered and since the tool is not konatantar Qaachwindigkait vorgaaohoban, beataht also dia Oafahr ainea Kurzaohluaaaa. This allows aa VerkatUok and baaondara | fc of tools of great Sohaden, if not taken care of is that the power supply aoglaioh and the power is diverted away from the work aatraoke.

In order to protect the tool electrode, thyristors are therefore kept ready in parallel with the work area. Shortly before or after an aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa the current flowing over the Arbaitaapalt are ignited. In addition, a choke has already been switched on in the Gleiohatromkreia between the direct current source and the working section in order to prevent a very rapid W increase in the current in the event of a short wave.

Since after a Kursaohluß the energy content of the throttle and the No energy supplied until the glacial atom source is switched off must be destroyed by the ohmaohen resistances of the circuit and the thyristors, is in such systems to the electrochemical Metal removal required the parallel connection of a large number of thyristors for high currents, which is essential contribute to the high system costs.

See the to eliminate these disadvantages in a simple way present application set to the task.

BAD ORIGINAL 909886/07 (K

Si · concerns «im · circuit arrangement sum Sohutz's work * · stretch against course bottom Ib of a Xinriohtung χι »electrochemical Ablation, in which parallel xur work atreoke a or more thyristors and mix direct current source and Workpieces are connected to a choke coil.

According to the invention, a τοη is a XurssohluJlerfaesua member Actuated Schüts Tcr seen, whose working contact xusätslieh parallel sur Arbeitsstreoke is toted. Das Kurssohlufler ~ fassungsglled should Tormehmlioh from a τοη of tension or the current in the Arbeitsstreoke or τοη both controlled Goal strong insistence

In the following, the invention is intended to "" iiri-i * of Figures 1 and 2 to be explained in more detail

Fig «1 sohenatiseh the circuit arrangement tends to recover Invention,

Fig. 2 clearly shows how the invention works. OenUI Fig. 1 is the work atreoke 1 over the Gleiohstron-

droesel k is connected to a direct current source 7, which is fed, for example, from one of the Drehatronnets

Transfomator and rectifiers can consist · The transfer «

nater entrance to τοη by a Schttts 5 dining Mets su "separate his. Parallel sur labor Streeke the required ^""■ _t ti! yrmm thyristors is connected welohes indicated by the thyristor. DC skins parallel sur labor Streeke 1" he Arbeltskontakt τοη Sehflta 3 switched · Schute 3, SoWlta 5 «ad Thrrletorbatterie 2 are τοη the KuraachluAerfaeaungaglied 6 operated.

The mode of operation of the circuit arrangement is clear from the diagrams in Fig. 2, in which the strobe flow over time is applied.

909886/0704

Up to the point in time t, normal working estron i flows. To the

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Zait t should then be a short circuit between Verkaeug and Verkatüok to enter where the Stroa sunäohat naheau linaar anataigt and tob point in time t on flows through the Tbjxietoren At time t. aoll daa Sohttts 3 watch and sua time t daa Sofailts 5 fall off, ao dafl the Stroa bia au dieaea time nooh anateigt «Srat naoh Abaobalten dea Ketsea ainks the Stroaat strength close to an exponential function from "

Trotadea is is τοη the Thyriatoren Nooh which the Fltohe ABCD entapraohende BNER ^ e au remlohten geveaen while the rest Bnergie το aufgenonaen "the remnant Wide Rath ends dea Stroakreiaea · Xe know therefore now an uplifting Liehe Af ^ ^h 1 tob thyristors οIngeapart and Anlagekoaten geaenkt weaentlioh will·

BAO ORIGINAL 909886 / 070A

Claims (1)

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