SU933352A1 - Method of electrochemical dimensional machining of metals - Google Patents

Description

() METHOD OF ELECTROCHYHIC DIMENSIONAL TREATMENT OF METALS

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This invention relates to electrochemical dimensional processing and can be used in mechanical engineering for metal processing.

There is a method of electrochemical dimensional processing of metals by regulating the process by changing the current density at which in the electrode. An additional electrode is installed in the native gap, a negative potential is applied to it relative to the tool electrode from an additional DC source pi.

The supply of negative potential to an additional electrode placed in the interelectrode gap leads to an intense release of gaseous hydrogen, which makes it difficult to stabilize the electrical conductivity of the solution in the treatment zone and to create a uniform electric field required for precise form of the research institute increased processing efficiency and shaping accuracy, as well as improved performance worked parts by reducing the concentration of hydrogen gas in the interelectrode gap.

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The goal is achieved by the fact that an additional electrode is installed outside the interelectrode gap from the side of the tool electrode, and the amount of negative potential supplied to the additional electrode is chosen from the condition that there is no current in the circuit between the electrode tool and the common point of both power sources.

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The drawing shows a diagram of the implementation of the method.

Claims (1)

The proposed method of electrochemical processing is implemented in the following manner. The workpiece 1 and the electrode tool 2 of a porous, easily passivating metal or alloy are connected respectively with + and - ocHOfuioro of power source 3. A negative electrode with a developed surface is fed and maintained during processing a negative potential from an additional source 5 of such magnitude , so that the current recorded by ammeter 6 is zero. With this method, an electrode tool, having a smaller sign of a negative potential, which means a gas emission, has the greatest influence on the formation of an electric field in the interelectrode gap, since it is located closer to the workpiece 1 .- -. Example. The proposed method of electrochemical processing was implemented in a laboratory setup for the electrochemical processing of samples of steel 12X18 101 in the electrolyte 10 at a current density of up to 10 1 O A / cm. The magnitude of the interelectrode gap between the workpiece and the elec- trode. In the course of processing, the tool-measuring electrode was not regulated and at the initial moment it was 0.5-1 mm. Processing time 10 sec. The speed of the electrolyte in the interelectrode gap was about 1 m / s. The voltage of the main power source is 3-5 volts. The voltage of the additional power source depends on the distance between the additional electrode and the electrode tool, as well as on the area of the additional electrode. In the experiments, the voltage of the additional power source was supplied and kept within 2-Tsv. The concentration of the gas phase in the interelectrode gap is reduced by a factor of 5-10 compared with treatment with the use of an additional electrode in the interelectrode gap. The new method of electrochemical dimensional processing in comparison with the known has the following advantages; a) improving shaping accuracy; b) the possibility of achieving high productivity; c) reduction of the hydrogenation of the surface layer of parts, which leads to an improvement in their performance characteristics. The invention The method of electrochemical dimensional processing of metals when supplying an interelectrode gap from a DC source and regulating a treatment process using an additional electrode, to which a negative potential relative to the tool electrode is supplied from an additional DC source, characterized in that improving process performance and shaping accuracy, as well as improving the performance characteristics of the machined parts, additional Electrode interelectrode gap is adjusted by elektrodainstrumenta and magnitude of the negative potential supplied to the further electrode selected from the condition of absence of current in the circuit between the electrode-tool and the common point of both power sources. Sources of information taken into account during the examination 1. USSR Author's Certificate No., cl. B 23 P I / O-, 1972.