RU2155827C1 - Gear for electrolytic deposition of coats - Google Patents

Abstract

FIELD: electrodeposition. SUBSTANCE: invention can be used to deposit coats on internal surfaces of cylindrical parts. Gear includes leak-tight electrolytic cell, activating head manufactured in the form of impeller carrying three levers and movably coupled activating elements copying machined surfaces and mounted on vertical axle in lower flange of electrolytic cell for rotation owing to transfer of hydrodynamic energy of jet of electrolyte to blades of impeller under pressure of 0.05 MPa as minimum. EFFECT: reduced energy consumption and enhanced rate of deposition of electrolytic iron. 1 cl, 2 dwg

Description

 The invention relates to electroplating and can be used for electrolytic coating on the inner surface of cylindrical parts.

 A device for electrolytic coating according to auth. USSR N 1705418, MKI C 25 D 5/06, 1987 (Bull. N 2, 1992).

 This device contains activating elements in the form of rollers of abrasive material.

 The disadvantages of this device: the inability to seal the electrolytic cell; the need to comply with the alignment of the activating head and the workpiece; the inability to ensure accurate copying of the treated surface with abrasive elements.

 Known devices for electrolytic coating (Toropynin S.I., Nikiforov A.A. Intensification of the rubbing process. Technique in agriculture. - M., 1977, N 3, p. 77-79) containing an activating element in the form of brushes.

 The disadvantage of these devices is the fixing of the activating elements directly on the anode, which complicates the current supply to the rotating anode and the replacement of worn anodes.

 A device for electrolytic coating (UK patent N 1364182, C 7 B, 1972) with simultaneous honing using abrasive bars.

 Its disadvantage is the anode rotating together with the bars, which complicates the current supply to it.

 Of the known closest in technical essence is a device for electrolytic coating according to auth. USSR N 1678911, MKI C 25 D 5/06, 1989 (Bull. N 35, 1991), containing an electrolytic cell, an activating head, a product mounting unit and a current lead. Moreover, the activating elements are installed in the mandrels by means of spring-loaded pads.

The disadvantages of the device:
- increased energy intensity of the device due to the use of an electric drive activating head;
- current-carrying device, made in the form of a contact ring and brushes, is subject to rapid wear, which leads to a decrease in the quality of contact and, consequently, to the deterioration of the device;
- the low circulation rate of the electrolyte does not allow to increase the deposition rate of the coating.

 The present invention is aimed at eliminating the above-mentioned disadvantages of the known and improving the technological process of applying electrolytic coatings on the inner surface of cylindrical parts by increasing the speed of circulation of the electrolyte in the electrolytic cell, activating the treated surface, improving the accuracy of copying the treated surface with activating elements, reducing the energy consumption of the device, using higher densities current.

 The specified technical result is achieved through the use of a device for electrolytic coating on the inner surface of cylindrical parts, containing an electrolytic cell, an activating head, a product attachment unit and a current lead, characterized in that the electrolytic cell is hermetically sealed, the activating head is made in the form of an impeller carrying three levers, with movably fixed activating elements that copy the work surface, and mounted on a vertical B in the bottom flange of the electrolytic cell rotatably by transmitting hydrodynamic energy electrolyte jet impeller blades at a pressure of 0.05 MPa.

 In FIG. 1 shows a longitudinal section of a device; in FIG. 2 - section aa.

 The device contains an upper 1 and lower 2 flanges in which there are nozzles 3 for supplying and discharging electrolyte. Between the flanges 1 and 2, a workpiece 4 with rubber gaskets 5 is installed to seal the formed electrolytic cell. The obtained sealed electrolytic cell is pulled together by vertical couplers 6 between the bed 7 and the pressure plate 8. In the lower flange 2, an activation head is installed on the vertical axis, consisting of an impeller 9, bearing three levers 10, with activating elements 11 mounted on them axially. the impeller 9 is limited by a removable fixed anode 12. The pressing of the activating elements 11 to the work surface is ensured by elastic shock absorbers 13 located in a rectangular groove x impeller 9 and acting on the lower arm levers 10. The current feeder to the workpiece 4 is carried out by means of the contact device 14 mounted on the frame 7, and the anode 12 through the contact terminal 15 from the DC source (not shown). Electrolyte circulation is provided by an acid-resistant hydraulic pump (not shown).

 The device operates as follows. After the corresponding treatment of the part 4 (Fig. 1) (i.e., machining, degreasing and etching), it is installed through the gaskets 5 between the upper 1 and lower 2 flanges and forms a sealed electrolytic cell, which makes it possible to increase the electrolyte circulation rate in comparison with similar devices. Then, the sealed electrolytic cell is pulled together by vertical couplers 6 between the bed 7 and the pressure plate 8. Further, the acid-resistant hydraulic pump delivers the electrolyte from the tank (not shown) through pipelines to the lower flange 2 of the electrolytic cell and returns to it through the outlet pipe 3 through pipelines into a container with electrolyte. The jet of electrolyte supplied to the impeller blades 9 under a pressure of at least 0.05 MPa gives it its hydrodynamic energy and causes it to rotate, setting in motion the activating elements 11. The activating elements 11, due to their movable fastening, accurately copy the treated surface of the part 4, making activation, removing the passivating film and updating the cathode layer of the electrolyte. At the same time, from the direct current source "+" and "-" of the operating current are supplied to terminal 15 and contact device 14, respectively.

 Next, the process of conventional electrolytic deposition in a flowing electrolyte with the activation of the cathode surface.

 At the end of the galvanic processing cycle, the direct current source and acid-resistant hydraulic pump are turned off, the sealed electrolytic cell is disassembled, the finished part (with a given coating thickness) is removed, and a new part is put in its place and the process is repeated.

Claims (1)

 A device for electrolytic coating on the inner surface of cylindrical parts, containing an electrolytic cell, an activating head, an attachment unit of the product, including upper and lower flanges and a current lead, characterized in that the electrolytic cell is sealed, the activating head is made in the form of an impeller carrying three lever, with movably mounted activating elements that copy the surface to be machined, and mounted on a vertical axis in the lower electrolyte flange cell with the possibility of rotation due to the transfer of hydrodynamic energy of the electrolyte stream to the impeller blades under a pressure of at least 0.05 MPa.

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