RU2581537C2 - Electrochemical method and device for marking its implementation - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to an electrochemical labeling deep metal parts. Process uses the template from the permeable dielectric bases coated with a circuit being marked signs of a conductive material, the pattern set on the basis of the dielectric surface of the workpiece, and the contours of marked symbols template is pressed against the cathode. Moreover, through the space between said substrate and supplying a pulsed cathode electrolyte under pressure and the highest pumping speed is set until the ejection of the electrolyte from the substrate and the cycle times of the electrolyte in the pulse cycle time is chosen to be paused. Apparatus comprises said template cathode flow control of the electrolyte and a control unit feeding electrolyte into the space between the substrate and the cathode, which is in the form of a wire brush with needles adapted to make contact with said contour of marked symbols, and the connection to the constant current, and the control unit configured to enable or disable the flow regulator electrolyte.

EFFECT: invention provide improved accuracy in the depth of the marks and signs boundaries profile.

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Description

The method and device relates to the field of engineering and can be used in electrochemical deep marking with pumping of electrolyte in the manufacture of metal parts.

A known method (Sedikin F.V. Dimensional electrochemical processing of machine parts. M: Mashinostroenie, 1976 - 302 p. (P. 139)) of cyclic processing with variable feed through the gap of the electrolyte.

The disadvantages of the method include the deterioration during the processing of removal from the gap of the processed products and the decrease in the accuracy of deep marking with fixed electrodes.

The known method (Patent 2275279 (RU) "Method for the electrochemical separation of sheet materials" / authors MG Smolentsev, EV Smolentsev, SA Ryabova, IT Koptev. Bulletin No. 12, 2006) processing of solid metal template with the formation on the details of the recesses in the places of profile windows in the template.

The disadvantage of this method is the impossibility of supplying the technological current to the isolated metal sections of the signs and the loss of accuracy of the profile of marked surfaces.

Closest to the proposed method is a method of deep electrochemical marking with profile electrodes with intensification of the process by impact of electrodes on the marks applied on parts (AS No. 1192917 (RU) “Method for dimensional electrochemical processing” / authors V. P. Smolentsev, A. I. Boldyrev, G.P. Smolentsev / Bulletin No. 43, 1985).

To implement this method, a device for electrochemical preparation of depressions according to the template is known (Patent for utility model 40936 (RU) “Device for electrochemical processing” / authors AR Zakirova, ZB Sadykov, EV Smolentsev, K.M Gazizullin, IA Odintsov, Bulletin No. 28, 2004).

The disadvantages of the known method and device are:

the disadvantage of the method: due to the unevenness of the gap, it is not possible to create the same impact forces of different electrodes, which causes a violation of the accuracy of the marked signs;

The disadvantage of this device is the limitation of the sections of the current supply to the marked signs, the decrease in the uniformity of the depth of the signs and the loss of marking accuracy.

The technical result from the implementation of the described method and device is to increase the accuracy of marking signs in depth and profile boundaries of the marks.

This is achieved by the fact that in the method of electrochemical marking of the surface of a metal part, a template of a dielectric permeable base with a contour of marked signs of conductive material deposited on it is used, in which a template with a dielectric base is mounted on the surface of the part, and the cathode is pressed to the contours of the marked signs of the template, while through the space between the aforementioned base and the cathode carry out a pulsed supply of electrolyte under pressure, with the highest pumping speed at tanavlivayut until the ejection of the electrolyte from the base and electrolyte feeding cycle duration in a pulse pause is selected equal to the duration of the cycle.

A device for electrochemical marking of the surface of a metal part contains a cathode in the form of a metal brush with needles having a length not less than the interelectrode gap and not more than the distance from the cathode to the template, and the needles are made with the possibility of contact with the said circuit of the marked marks and connection to direct current, and the control unit is configured to turn on and off the electrolyte flow rate controller.

The essence of the method and device is illustrated in FIG. 1-3.

In FIG. 1 shows a General diagram of the method and structure of the device.

In FIG. 2 shows a process for removing treatment products.

In FIG. 3 shows a diagram of the electrolyte supply to the treatment zone.

The device contains a dielectric permeable base 1 with a conductive material deposited on it with a contour 2 of marked marks. The template, consisting of the base 1 and the contours 2 of the marked signs, is placed on the part 3, which is the anode. The cathode 4 is made in the form of a metal brush with needles 5 having contact with the circuit 2 of all marked signs. In the interelectrode gap S (Fig. 1) between the base 1 and the cathode there is an electrolyte 6. At the output of the electrolyte 6, an electrolyte flow controller 7 is installed, controlled by block 8.

When pumping the electrolyte 6 (Fig. 2) through the permeable base 1, the electrolyte 6 moves and the products of processing 9 are removed from the recess 10 formed on the part 3.

The electrolyte 6 flows around (Fig. 3) the contour of each sign 2 on the part 3, reaches the place where the recess 10 is received and, due to the acceleration or deceleration of the flow 11, provides movement through the base 1 of the electrolyte 6 in the recess 10 along the cathode 4.

The method is as follows: on the part 3 (Fig. 1), a side of a dielectric permeable base 1 with a contour 2 of marked marks of conductive material applied to it is installed on the side without circuit 2. The cathode 4 with needles 5 having a length not less than the interelectrode gap S (Fig. 1), but not more than the distance between the cathode 4 and the template, is pressed against the circuit 2 of marked marks until metal contact between the cathode 4 and circuits 2 is reached. Through the space between electrolyte 6 is pumped under pressure by the base 1 and cathode 4, which, encountering an obstacle in the form of circuit 2, deepens into the base 1. Due to the variable speed of the electrolyte 6, ejection of the electrolyte 6 occurs at the outlet of the base 1, which is seen from the gas-liquid trolita 6 at the outlet from the space between the substrate 1 and the cathode 4. Ejection increases the value (Fig. 3) accelerating flow 11 to the value necessary for removal through the substrate treatment products 1 9 (Fig. 2). Due to the passage of current through the cathode 4, needles 5, circuit 2 and electrolyte 6 under the base 1, above part 3, under the circuit 2, recesses 10 are formed (Fig. 2), in the form of signs 2.

The flow rate 11 (Fig. 3) is regulated by an electrolyte flow controller 7 (Fig. 1). Turning the controller 7 on and off is performed according to the instructions of the control unit 8. At the same time, the flow time of the stream 11 should be provided with a speed sufficient for the formation of ejection and removal of the products of processing 9 (Fig. 2).

On command from block 8 (Fig. 1), the regulator 7 reduces or increases the consumption of electrolyte 6, which causes a pulse increase or decrease in the pressure of the electrolyte 6 and deceleration of the flow 11 in front of the circuit 2 of the marked mark. This, with increasing pressure, accelerates the passage of electrolyte 6 in this zone through the base 1 and above the surface of the part 3, accelerating the removal of the processed products 9.

To eliminate the accumulation of processing products 9 (Fig. 2) under circuit 2, the volume of the recess 10 of the electrolyte 6 introduced into the treatment zone and its removal through the base 1 should be the same, which determines the equality of the time of movement and braking during pauses of the flow of electrolyte 6.

An example of the method: on the surface of a part made of ZhS6K alloy, it is necessary to apply deep information with a height of 5 mm, with a sign depth of 0.3 mm.

A template with a base of 0.3 mm thickness made of woven kapron threads with gaps between them and copper alloy signs with a thickness of 0.4 mm applied to the base is installed on the part. The cathode with needles with a diameter of 0.1 mm is pressed to the signs until the needles are in contact with all the signs. An electrolyte (5% NaNO ₃ solution) is fed into the space between the base and the cathode and the pumping rate is controlled by increasing the electrolyte pressure to 2 MPa. The control unit is given a cycle of electrolyte supply and pauses after 3.5 seconds. Connect the cathode and part to a direct current with a voltage of 6V.

After processing for 50 seconds, deepenings were obtained on the part in the form of information signs with a depth of 0.3 ± 0.1 mm. The width of the contour of the signs was 0.5 ± 0.05 mm. The indicated results meet the requirements of the marking standard.

Claims (2)

1. The method of electrochemical marking of the surface of a metal part, including the use of a template of a dielectric permeable base coated with a contour of markable signs made of conductive material, characterized in that the template with a dielectric base is installed on the surface of the part, and the cathode is pressed to the contours of the markable signs of the template through the space between the aforementioned base and the cathode carry out a pulsed supply of electrolyte under pressure, with the highest pumping speed set before the appearance of electrolyte ejection from under the base, and the duration of the electrolyte supply cycle in the pulse is chosen equal to the duration of the pause cycle. 2. A device for electrochemical marking of the surface of a metal part, containing a template of a dielectric permeable base with a contour of marked marks of conductive material deposited on it, a cathode, an electrolyte flow rate regulator and an electrolyte flow control unit in the space between the base and the cathode, characterized in that the cathode is made in the form of a metal brush with needles having a length not less than the interelectrode gap and not more than the distance from the cathode to the template, and the needles are made with the possibility of providing contact with the aforementioned circuit of marked signs and connecting to direct current, and the control unit is configured to turn on and off the electrolyte flow controller.

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