SU1733502A2 - Apparatus for deposition of coatings - Google Patents

Abstract

The invention relates to a technique of electrostatic coating. The purpose of the invention is the expansion of technological capabilities by applying harder than the product of conductive materials by combining the processes of electrical erosion and alloying the surface of the product with a coating material and a brush. It may be N. i. GOG., YGG- / -J & & 7 5 4 is used to apply metal coatings on the surface of metal products of various shapes. The device comprises a metal brush 1 mounted on the rotational drive shaft 2. Element 3 of the coating material, which is made in the form of a cylindrical body of rotation, is constantly in contact with the brush 1. The element 3 of the coating material is mounted in the support unit 4 rotatably around the axis 5 and with the positioning of the forming line of the surface of the rotation body along the forming working surface of the brush 1. The support node 4 is made on a rolling bearing and mounted rotatably with the bracket 6 around the axis 7, making constant contact of element 3 with brush 1 under the action of the force of own gravity. In addition, the device is equipped with a pulse generator 8. The generator 8 has at its output 9 pulses of positive polarity with respect to the common wire 10, and at its output 11 - pulses of negative polarity with respect to the common wire 10. The output 9 of the generator is connected to element 3, the common wire 10 has electrical contact with the brush 1, and the output 11 is connected to the workpiece 12.2 Il. C / C a and a with N N

Description

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This invention relates to metallic coatings and is complementary to author # 1482980.

A device for coating a surface containing a metal brush and a metal element of a metal coating in contact with it, made in the form of a cylindrical body of rotation, is installed with an arrangement of the forming line of the surface of the body of rotation along the forming line of the working surface of the brush for rotation.

The disadvantage of this device is its limited technological capabilities, since it can only be used if the conditions

Np Nsch Ne, where Np is the hardness of the coating material;

Nsch - the hardness of the material of the brush;

Neither is the hardness of the material of the product.

This is due to the fact that the process is reversed at HpNsch: the material of the product, removed by brushing, is transferred from the material of the brush to the element of the coating material. In the case of H.N.N., it is not the coating material that is transferred to the brush, but the material of the product. In the case of an NS, the brush material is transferred onto the product, but not the coating material, since it is not transferred onto the brush.

The purpose of the invention is to expand the technological capabilities of the device to apply more conductive materials that are harder than the base by combining processes — electrical erosion and electrospark doping.

This goal is achieved by the fact that the coater is equipped with a pulse generator of opposite polarity, the conditionally positive electrode of which is connected to the element of the coating material, conditionally zero - with a brush, and the conditionally negative one is intended to be connected to the workpiece.

In addition, in order to coat refractory alloys on parts made of fusible alloys (for example, based on aluminum), the brush is made of separate isolated sectors, equipped with two current collectors, the generator is made in two independent blocks, and the current collectors are connected by opposite terminals two pulse generators and predznacheny for simultaneous supply of pulses of opposite polarity to the sectors of the brush.

The presence of a pulse generator in the device makes it possible to substantially expand the technological capabilities of the device. Coating mechanism

from a purely mechanical material, which is fundamental to the milling, produces removal - application, regardless of the ratio of the hardness of the materials of the coating, the substrate and the brush.

0 A device can use a serial pulse generator of an electrospark doping unit, so that at its output it is possible to organize pulses of different polarity, for example,

5 using a voltage divider.

The use (Fig. 2) of two independent generators with a sector brush leads to a further expansion of the technological capabilities of the device, while the possibility of applying solid metal coatings to the substrate, regardless of the hardness of its surface, there are no limitations associated with fixed polarity of pulses applied to the element to the machined surface relative to the brush. It is known that for a certain pair of metals, both erosion and coating can occur only when they are connected to the generator terminals (for example, the coating element — the anode, brush — the cathode). The implementation of the process according to the scheme (Fig. 2) makes it possible to independently organize the anode-cathode pairs at the points of contact of the coating element — a brush and a brush — the workpiece by simply switching the electrodes to a block of two generators.

Fig. 1 schematically shows a device in which the coating on

The base is made with a solid brush; figure 2 - the same, but the brush is made of separate, electrically isolated from each other sectors.

Coating Device

5, the surface (Fig. 1) comprises a metal brush 1 mounted on a rotational drive shaft 2 (not shown). The brush 3 is constantly in contact with the element 3 of the coating material, which is made in the form

0 cylindrical body of rotation. The coating material element 3 is mounted in the support assembly 4 rotatably around the axis 5 and with the location of the forming line of the surface of the rotation body along the forming working surface of the brush 1. The support assembly 4 is made on a rolling bearing and mounted rotatably with the bracket 6 around the axis 7 , made constant contact of the element 3 of the coating material with the brush 1 under the effect of the force of its own gravity. In addition, the device is equipped with a generator of 8 pulses (EFI 46). The generator 8 has at the output 9 pulses of positive polarity relative to the common drive 10, and at the input 11 - pulses of negative polarity relative to the common wire 10.

The output 9 of the generator is connected to the element 3 of the coating, the common wire 10 is in electrical contact with the brush 1, and the output

11 is connected to the workpiece 12.

The main parameters of the device are as follows: voltage Ui 0-100 V; (J2 0-100 V (indices 1 and 2 refer to the characteristics of positive and negative polarity pulses, respectively); energy Wi, 0-5 J; pulse duty cycle h, 2 2 -20; material of element 3 - VK8 alloy; brush material 1 — 65G steel; workpiece — AK-4 alloy; brush rotation speed 1 w 60–500 rpm; product transfer speed V 1 –10 cm / s; clearance between product 12 and brush 1 d 0–50 µm.

The device works as follows.

In order to apply the coating to the surface of the product 12 and the brush 1, the element 3 of the coating material is brought into rotation, coming into contact with it.

Processed surface of the product

12 are brought in and moved along the bottom of the brush 1 with a gap of 0–50 µm; they include a generator of 8 pulses. At the same time, erosion, removal and transfer of the coating material from the element to the brush 1 and in the place of their contact occurs in the upper part (due to the fact that the latter is the cathode in relation to the body 3); at the same time, the material from the bottom of the brush 1 is transferred to the surface of the workpiece 12 at the place of their contact or the minimum gap due to the fact that the part is a cathode with respect to the brush 1.

As a result of processing, a layer of hard coating 10-15 microns thick was formed on the surface of article 12.

In order to expand the technological capabilities of the device, the brush can be made in the form of sectors electrically isolated from each other. In this case, the pulses from the unit are supplied to the current collectors (the design is similar to that used in collector engines), and the generator 8 of pulses consists of two independent units connected by pin 9 to the covering material element, by leads 10 and 11 to diametrically located sectors of the brush 2, and terminal 12 to the workpiece 13 in accordance with figure 2.

The operation of such a device differs from that described by the fact that it is possible to adjust the electrical parameters of the pulses arriving on the pairs Brush 1 - Cover Element Zi Brush 1 - Workpiece 13 independently of each other, and also independently change the polarity of the pulses fed from the generator blocks 8. The device described in the example (Fig. 1)

tested when applying coatings in alloy VK8 on steel grade 12X18H10T.

The use of the proposed device allows the range of metal combinations to be expanded.

due to the possibility of precise selection of the technological regimes of the electric-spark erosion of the coating element and the coating of the workpiece in an independent manner, as well as to expand

technological capabilities by combining the processes of electroerosive doping and electroerosion processing. In addition, the device improves process performance,

Claims (1)

increase the thickness of the applied layer. Claim device USSR No. 1482980, characterized in that, in order to expand technological capabilities by applying more conductive materials that are harder than the base by combining the processes of electrical erosion and electrospark doping, it is equipped with a generator of opposite polarity, which is conventionally positive connected to the element of the coating material, conditionally zero - with a brush, and conditionally negative is intended to be connected with the workpiece.  % ffl J 4 12 Jj