SU751550A1 - Method of electrochemical dimensional working - Google Patents

Description

The invention relates to electrochemical dimensional abrasive work in current-conducting materials and can be used for other: small and small holes, electrochemical wire cutting and other operations.

The known method of impulse elektro.ktro.i. And the processing of small intergeneral gaps, which consists in the fact that the anodic dissolution process is carried out by adjustable current pulses (While maintaining a small electrode gap

The size of the gap is chosen such that the overpotential of hydrogen evolution from the cathode is greater than the displacement and the deposition of atoms of the anode material or the (Cations of the electrolyte used).

The disadvantages of the known methods are low productivity and high energy intensity, the trichin of which is gassing in the interelectrode gap. The gas release in the interelectrode gap in the considered methods occurs IB 1 CONNECTION to the fact that the duration of current pulses is determined by various processes iB interelectrode gap (gas release, the formation of electronic conductivity, heat release) and does not put in

dependence on the time of the beginning of that or a different electrochemical reaction at the electrodes.

The aim of the invention is to increase productivity and reduce the energy consumption of the process of electrochemical dimensional processing of pulsed current by eliminating gas evolution in the interelectrode gap.

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The goal is achieved by the fact that in a known method, based on the anodom.dissolution of a pulse, the current’s duration, the pulse duration of the current is less than the time required for the formation of a molecular gas

15 anode.

iHa drawing shows a device for implementing the method.

The device consists of a bath} filled with electrolyte 2, in which the machined part 3 (anode) is placed,

20 pulse generator 4, wire electrode 5 (cathode), guided by rollers 6 and rewound from a reel to a reel 7, using a current collector 8 and a connected IK pulse generator.

When (supplying current pulse (voltage) at the anode, first an oxidation reaction (dissolution) without gas formation takes place, after passing a certain amount of electricity (some time), gassing starts on it, first 3 atoms, then in m-molecules NOR state, iKOTOpoAiy is caused by the potential of ia IB depending on the amount of electricity it passed (| time). IF the amount of electricity passed (pulse duration), the pulse will be smaller (for data processing conditions) (Values , .If (of which the potential of the a.nod reaches the value of gas emission. and then there will be no gas release at the apode.

The magnitude of the interelectrode gap, during the passage of a current pulse, the duration of the KOTQpoTO is less than the time of the beginning of the formation of a single molecule of a dyed ha. The reduction of the electrode gap makes it difficult to isolate the molecular hydrogen at the cathode and makes it easier; In this example, the ab "01 notion of the BeBxHOCTH of the cathode (electrode of the probe) from the deposited material

the anode is processed by winding the electrode wire.

In order to perform electrochemical processing without; PIA gas emission section 5, the duration of such pulses (voltage) is set less than 1 time to start forming the molecular gas layer on the anode, and the interelectrode gap value is less than . m a: the cathode begins to release hydrogen Li of selected durations and amplitudes of the pulse, cathode and apode materials, and electrolyte.

The method was tested under laboratory conditions during the treatment of Fe-Armco and Cobalt samples in a 15% aqueous solution of NaCl. The treatment was carried out with a shod at inter-elec (native gap (gap) of rectangular current pulses, controlled ino for the duration and frequency of the sequence, and adjustable for inter-lactate gap). The presence of the gas & gamma was visually determined.

5; The table shows the results of testing.

It can be seen from the table, by changing the pulse duration to. To (experiment No. 1, paragraph 2, No. 4, and 5) and the size of the interelectrode gap (experiments No. 2 and 3), the gas release in the electrode gap can be eliminated.

The use of the proposed method of pulsed electrochemical dimensional processing of current and conductive materials ensures that the processing capacity is increased by reducing the time required for removal and supply of the tool electrode in order to pump electrolyte to eliminate the presence of IB gas bubbles. the increase in output by: ku and, thus, reducing the energy intensity of processing; n. higher accuracy of machined parts; anodic contamination reduction

no electrolyte dissolution.

Claims (1)

1. Vdovenzho V. G. Besshlam ava-dimensional electrochemical treatment of metals. Theses of the reports of the zonal "scientific and technical: conferences: Siberia and the Far East. - Sat. “Electrochemical methods of processing and hardening the working surfaces of machine parts, Tyumen, 1976, p. 22-h24.