SU1164320A1 - Device for applying coatings on fine components by electrodeposition method - Google Patents

Abstract

A DEVICE FOR DRAWING COATINGS ON A SMALL DETAIL BY ELECTRICAL PROCEDURE, containing a bath, current leads to them, on the electrodes, and e with this. In order to improve the quality of the coating, it is equipped with a rod with discs with substrates with elastic and inelastic needles attached to it, inelastic inlets located vertically on the upper surface of the substrates, and elastic ones at an angle to the substrate plane on the bottom. its surface.

Description

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The invention relates to electrochemistry, in particular to devices for applying paint coatings on small metal products by electrodeposition.

The aim of the invention is to improve the quality of the coating.

Due to the presence of a plate substrate with needles located on it, which is an anode in this device, the proposed device provides reliable electrical contact of the painted parts with the surface of the working electrode - anode through a minimum, point contact area without mixing parts during the painting process, which allows to reduce to a minimum probabilities of both uneven coloring of parts, and mechanical damage to the coating, i.e. improve the quality of the paintwork.

The drawing shows the proposed device, a General view.

The device consists of a perforated container with a conductive bottom 1 and current-conducting walls 2, a rod 3 with a disk support 4, plates 5 mounted on a rod, on the upper surface of which (except the upper plate) vertically fixed inelastic needles b, on the bottom surface ( besides the bottom plate) - elastic needles 7, removable sleeves 8, determining the distance between the plates, screw connections 9 and 10, ensuring the supply of electricity to the device,

The working area of the device may contain plate-shaped substrates with a needle-like surface. The distance between the needles is determined from the ratio B k6jm, H) 42 the distance between the needles; S / iin is the minimum size of the painted part; k is a proportionality coefficient equal to 0.2 for inelastic needles and 0.6 for elastic needles.

The coefficients are chosen experimentally in such a way that there is no freezing of the painted parts into the inter needle space.

Inelastic needles located on the upper surface of the plate vertically to its plane are made

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from stainless steel and have the pointed ends providing reliable point contact of the painted products with a working surface 5 of the anode.

Elastic needles located on the bottom surface of the plates, made of stainless steel, may have a diameter of not more than 0.05 mm, sufficient for making electrical contact of parts with the anode, set at an angle a 40-45 to the substrate plane. This angle of fastening of the needles ensures reliable electrical contact of the anode with parts of various complex configurations. At an angle of less than 40 and more than 45, it is not possible to make reliable contact of the anode 20 with the details of a complex configuration.

The length of the elastic needles (8 c) is determined from the ratio 6 (j H – C, where H is the distance between the plates, j is the length of the inelastic needles, the minimum size of the part being painted.

The device works as follows.

Beforehand, the rod 3 is installed exactly along the axis of capacitance. Plates 5 are put on the rod, on which the parts are pre-poured in one layer. The distance between the plates is set using sleeves 8. The number of plates is chosen, as a result, from a given capacity. After all the plates are installed, the upper mounting sleeve 8 through the washer 9 O-zalmatmutsya screw 10, which ensures the rigidity of the structure and conductivity of the system. The washers 9, to which the conductors are connected, serve to supply energy to the devices from a power source. After collecting the device, electrolyte is poured into the bath, power is applied, and the painting process begins.

Due to the presence of n removable plates, the following options for device operation are possible.

When painting bulky parts that fill the entire working area of the device, only the upper 55 surface of one lower plate is used.

When coloring small parts of a simple configuration, the top surface of all n plates is used.

When painting small parts of a complex configuration, both the top and bottom surfaces of the plates are used.

When painting parts of intermediate (between the above dimensions) sizes, a part of the plates is used, and the distance between them is adjusted with the sleeves in accordance with the sizes of the parts being painted.

Example. A device for painting small items in bulk is used to paint small metal fittings, namely the zipper lock types 10 and 20. This device contains 4 plates with a diameter of 100 mm. In accordance with the dimensions and configuration of the parts to be painted, the remaining parameters of the device are made as follows: the distance between the plates is 25 mm; inelastic needles with a diameter of 0.15 mm and

5 mm long, located at a distance of 3 mm from each other, elastic needles with a length of 8-10 mm — at an angle of 40–45 ° to the substrate plane and at a distance of 9 mm from each other. The length of the elastic needles of 9 mm provides a reliable additional contact of the painted parts (zipper lock) with

the anode surface, and a 5 mm inelastic needle length is sufficient both to ensure electrical contact with the anode and to support parts (without bending the needles under the

details). Paint coatings, obtained using the proposed device, on experimental batches of samples in the amount of 2000 pcs. have a uniformly painted surface on which there are no defects in mechanical damage, i.e. high quality compared to the coatings obtained using the prototype device.

Claims (1)

DEVICE FOR APPLYING COATINGS ON SMALL DETAILS BY ELECTRODEPOSITION METHOD, containing a bath, electrodes and current leads to them, characterized in that, in order to improve the quality of the coating, it is equipped with a rod with plate-shaped substrates fixed on it with elastic and non-elastic needles, and inelastic the needles are located vertically on the upper surface of the substrates, and the elastic ones are at an angle to the plane of the substrate on its lower surface. >