RU179324U1 - DEVICE FOR APPLICATION OF COMPOSITE ELECTRICAL COATING ON PARTS - Google Patents

Abstract

The device is intended for applying a composite galvanic coating to parts made of electrolytes containing solid particles (from suspensions). The technical result - improving the quality of the coating, simplifying the design and improving ease of use. The device contains a bath for the electrolyte, a bubbler for the formation of a suspension, a fixed anode and a rotating cathode (part). The bubbler is equipped with a microporous membrane, which simultaneously serves as the bottom of the bath and is hermetically connected to the chamber for pumping air. The current supply to the rotating cathode (part) is carried out by a mechanism whose contact element is a permanent magnet. Bubbling air through a microporous membrane ensures a uniform concentration of solid particles in the entire electrolyte volume and on the surface of the coated part. The current lead design provides reliable contact with the cathode, which eliminates current ripple during coating. This device provides a uniform composite coating with a surface concentration of particles of 75-80% on the part. 1 ill.

Description

The utility model relates to the field of deposition of galvanic composite coatings on parts, mainly for the manufacture of diamond lapping.

A device for coating according to the patent of the Russian Federation No. 2436873, published on December 20, 2011 in bull. No. 35, containing a container with electrolyte, a fixed anode, a shaft rotating around the surface to be treated, a head with rollers activating the surface to be treated, a mechanism for pressing them against the surface to be treated, a hopper with a pipeline and a particle feed regulator for the surface to be treated.

This device has a complex structure and is applicable for a specific range of large parts.

The closest in technical essence and the achieved result is a technical solution according to copyright certificate No. 1463809 C25D 15/00 "Device for applying solid particles to products" (prototype), published in Bull. No 9 March 7, 89. Authors M.A. Ziser et al.

This device contains a galvanic bath with inclined walls, at the bottom of which there is a bubbler, made in the form of a prefabricated chamber, consisting of a lower spherical shell with nozzle holes radially spaced along concentric circles, an upper spherical shell and a rack with an axial channel and several inclined channels with their exit into the chamber cavity. All elements of the chamber with pre-installed seals are tightened with a nut. The supply of compressed air to the axial channel is carried out by a flexible hose. The device also contains an anode and a collection cathode.

The disadvantage of this device is that the bubbler design provides a working concentration of a suspension of solid particles during periodic air supply: particles are fixed with a nickel coating when the air supply is off.

Thus, this device does not provide a uniform composite diamond coating on the entire surface of the part, it is difficult structurally and in operation.

The technical result of the utility model is to improve the quality of the coating, simplifying the design and improving ease of use.

The specified technical result is achieved by the fact that in the device for applying a composite galvanic coating to parts containing a bubbler in the form of a chamber with a pipe for air supply, a fixed anode, a rotating cathode (component), a current supply to the cathode, according to a utility model, the bubbler is equipped with a microporous membrane as the bottom of the bathtub, permeable only to air and hermetically connected to the chamber for pumping air and the walls of the bathtub, and the current supply to the cathode is made in the form of a sliding ring mechanism whose contact element is a permanent magnet.

Due to the bottom of the bath formed by the microporous membrane, a compressed air is created in suspension with a uniform concentration of diamond particles in the entire electrolyte volume and on the surface of the coated parts during their rotation, and the current supply in the form of a sliding ring mechanism, the contact element of which is a permanent magnet, provides continuous (without gaps) the current is supplied to the cathode, which eliminates the peeling of the coating from the part, which occurs when the current is interrupted even for 0.5-1 seconds.

The figure shows the device, the General scheme.

A device for applying a composite galvanic coating contains a galvanic bath including a shell 1, a bottom 2 (microporous membrane), a chamber 3, in which a fitting 4 for supplying compressed air, an anode 5, a cathode (part) 6, a sliding ring mechanism (current lead) 7 is built-in , contact element 8, cathode holder with a rotation mechanism 9, electrolyte 10, diamond powder particles 11. The device operates as follows.

In the bath with the electrolyte immersed assembly cathode 6, recruited from the coated parts and set it against the anode 5. The cathode 6 and the anode 5 are connected to the corresponding poles of the power source (Fig. Not shown). Then through the nozzle 4 serves compressed air, which passes through the bottom (microporous membrane) 2, raises the diamond powder particles located in the electrolyte and creates a suspension with a uniform concentration of diamond powder particles in the entire volume of the electrolyte 10. Then, the rotation mechanism associated with the holder the cathode 9, fed through a sliding ring mechanism (current supply) 7 with the contact element 8, current is supplied to the cathode 6 (part) and the coating is deposited to a predetermined thickness. Electrolytes based on nickel, iron, and their alloys are used, which provide hard coatings firmly adhered to the surface of the part. Electrolytes of copper plating, galvanizing do not provide high-quality coatings. In the grindings made on this device, the surface concentration of diamond grains was 75-80%. A nickel plating electrolyte containing diamond particles of 20-30 microns in size was used.

Lapping tests during the processing of plunger couples under production conditions gave positive results.

Claims (1)

A device for applying a composite galvanic coating to parts containing a bath with a bubbler in the form of a chamber with a pipe for supplying air, a fixed anode, a rotating cathode (part), a current lead to the cathode, characterized in that the bubbler is equipped with a microporous membrane as the bottom of the bath, which is permeable only for air and hermetically connected to the chamber for pumping air and the walls of the bath, and the current supply to the cathode is made in the form of a sliding ring mechanism, the contact element of which is a permanent magnet.

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