RU2774695C1 - Device for electrospark formation of coatings - Google Patents

Abstract

FIELD: engineering.

SUBSTANCE: invention relates to the field of formation of coatings by the method for electrospark alloying and can be used in various branches of engineering. The device contains an electrode installed in the cavity of the electrode holder connected to the source of the cooling agent and made with the possibility of reciprocating movement with the electrode and connection to the power supply wire using a terminal fixed by means of a threaded connection. The device contains an air motor and a head fixedly connected to the air motor housing, on which the LED is mounted. The electrode holder is rigidly connected to the link having an elliptical hole, the major axis of which is perpendicular to the direction of its movement. At the end of the air motor shaft, a cylindrical pin is rigidly fixed, the center of which is displaced relative to the axis of the air motor shaft by an eccentricity value and which is configured to move inside the said elliptical hole when the air motor shaft rotates. The link is made of steel and contains two elongated guide holes, which are oriented with their long side along the direction of movement of the link and into which two guiding cylindrical pins are threaded, symmetrically located relative to the center of the air motor shaft and fixed on the surface of the head.

EFFECT: reciprocating movement of the backstage is provided without the need to form a groove in the head and without the use of a ball bearing, as well as the reliability of the current supply and the light-dynamic protection against the pulsed impact of electric current discharges on the operator's eyes and the illumination of the coating formation zone on the surface of the part in the zone of its contact with the electrode.

1 cl, 2 dwg

Description

Technical field

The invention relates to the field of formation of coatings by the method of electrospark alloying and can be used in various branches of engineering: aviation, shipbuilding, energy, agriculture and others, and also, in particular, for the formation of coatings on the working and guide vanes of steam and gas turbines.

State of the art

It is known from the prior art adopted as a prototype of the claimed invention a device for electrospark formation of coatings, containing an electrode installed in the cavity of the electrode holder, having a branch pipe for connecting to a source of a cooling agent and configured to be connected to a power supply wire and reciprocating movement with the electrode. In this case, the device contains a detachable head, which is connected by screws to the base rigidly connected to the air motor housing. In this case, the electrode holder is rigidly connected to the link, made with the possibility of free movement in the groove of the base of the split head, the edges of which coincide with the edges of the link, and the depth is equal to the thickness of the link. Moreover, the link is made of a dielectric material and has an elliptical hole, the major axis of which is perpendicular to the direction of movement of the link. At the same time, at the end of the air motor shaft, the inner ring of the bearing is rigidly fixed, the center of which is displaced relative to the axis of the air motor shaft by the amount of eccentricity, and the outer ring of the bearing is configured to move along the inner surface of the said elliptical hole during rotation of the air motor shaft. Moreover, the bearing and part of the backstage are closed with a lid having a groove that coincides in length and width with the groove on the base of the split head, and a lever is installed on the air motor housing, which is configured to control the valve that regulates the supply of compressed air through the pipe in the air motor (patent RU 2703216 C2, published on October 15, 2019 (hereinafter referred to as [1])).

The disadvantages of the device known from [1] for the electrospark formation of coatings are as follows.

The link of the device known from [1] is made of a dielectric material, which limits its reliability in terms of mechanical strength due to its rapid abrasion when its side surfaces rub against the groove walls of the base of the split head made of metal material.

To ensure the accuracy of the stroke and the implementation of the reciprocating motion of the backstage of the device known from [1] through a ball bearing, the backstage must be made with a width almost equal to the diameter of the air motor housing.

In the device known from [1], there is no light-dynamic protection against the pulsed impact of electric current discharges on the operator's eyes during the electrospark formation of the coating.

Disclosure of invention

The objective of the invention is to simplify the design and increase the reliability of the device for electrospark formation of coatings, and the technical results achieved are to provide reciprocating motion of the backstage without the need to form a groove in the head and without the use of a ball bearing; providing light-dynamic protection against pulsed impact of electric current discharges on the operator's eyes and illumination of the coating formation zone on the surface of the part in the zone of its contact with the electrode in the process of electrospark coating formation; ensuring the reliability of the current supply in the process of electrospark formation of the coating.

The solution of this problem by achieving the specified technical results is ensured by the fact that the device for electrospark formation of coatings contains an electrode installed in the cavity of the electrode holder, having a branch pipe for connecting to a source of a cooling agent and configured to be connected to a power supply wire and reciprocating movement with the electrode . In this case, the electrode holder is rigidly connected to the rocker. Moreover, the link has an elliptical hole, the major axis of which is perpendicular to the direction of movement of the link. At the same time, a lever is installed on the air motor housing, which is configured to control the valve that regulates the supply of compressed air through the nozzle in the air motor. The device also contains a head, which is fixedly connected to the air motor housing. At the same time, a cylindrical pin is rigidly fixed at the end of the air motor shaft, the center of which is displaced relative to the axis of the air motor shaft by an eccentricity value and which is configured to move along the inner surface of the above elliptical hole when the air motor shaft rotates. Moreover, the link is made of steel and contains two elongated guide holes, which are oriented with their long side along the direction of movement of the link and into which two guiding cylindrical pins are threaded, symmetrically located relative to the center of the air motor shaft and fixed on the surface of the head. In this case, the minor axes of the two elongated guide holes are parallel to the major axis of the elliptical hole, and the major axes of the two elongated guide holes are coaxial with the minor axis of the elliptical hole. Moreover, all cylindrical pins and part of the backstage are closed with a lid having a groove and fixedly attached to the head. At the same time, an LED is installed on the air motor housing, designed to provide illumination of the coating formation zone on the surface of the part in the zone of its contact with the electrode in the process of electrospark coating formation. Moreover, a terminal is fixed on the electrode holder by means of a threaded connection, designed to be connected to the power supply wire.

The causal relationship between the distinctive features of the claimed invention and the achieved technical results is as follows.

A cylindrical pin rigidly fixed at the end of the air motor shaft, the center of which is displaced relative to the axis of the air motor shaft by the amount of eccentricity and which is configured to move along the inner surface of the above elliptical hole during rotation of the air motor shaft; making a steel stage with two elongated guide holes, which are oriented with their long side along the direction of movement of the stage and into which two cylindrical guide pins are threaded, symmetrically located relative to the center of the drive shaft and fixed on the surface of the head; parallelism of the minor axes of the two guide elongated holes of the major axis of the elliptical hole; alignment of the major axes of the two guide elongated holes with the minor axis of the elliptical hole; and closing of all cylindrical pins and part of the stage with a cover having a groove and fixed to the head, provide reciprocating movement of the stage without the need to form a groove in the head and without using a ball bearing due to the use of two oblong holes as guides during the reciprocating movement of the stage , and the implementation of the scene steel allows you to abandon the use of a ball bearing in the design of the device in order to increase its reliability, since, for example, in the process of operation of the device known from [1], a shock load occurs on the ball bearing, which has a negative impact on its durability.

Installing an LED on the air motor housing, designed to provide illumination of the coating formation zone on the surface of the part in the zone of its contact with the electrode in the process of electrospark coating formation, provides light-dynamic protection against the pulsed impact of electric current discharges on the operator’s eyes and illumination of the coating formation zone on the surface of the part in the zone its contact with the electrode during the electrospark formation of the coating.

Fastening on the electrode holder by means of a threaded connection of the terminal, intended for connection to the power supply wire, ensures the reliability of the current supply in the process of electrospark formation of the coating.

Brief description of the drawings

In FIG. 1 shows a side view of the device for the electrospark formation of coatings in a longitudinal section along the symmetry axis in its upper part. In FIG. 2 shows a top view of the device for electrospark formation of coatings without a cover.

Description of drawing positions

1 - electrode;

2 - electrode holder;

3 - branch pipe;

4 - wings;

5 - elliptical hole;

6 - air motor;

7 - lever;

8 - branch pipe;

9 - fitting;

10 - head;

11 - air motor shaft;

12 - cylindrical pin;

13 - elongated guide holes;

14 - guide cylindrical pins;

15 - cover;

16 - LED;

17 - terminal;

18 - screw;

19 - button;

20 - screws;

21 - nuts;

22 - screws.

Implementation of the invention

Below is a particular example of the design of a device for the electrospark formation of coatings and the principle of its operation.

The device for electrospark formation of coatings contains an electrode 1 clamped by means of a screw 18 in the cavity of the electrode holder 2, which has a branch pipe 3 for connection with a source of a cooling agent and is configured to be connected to a power supply wire and reciprocate with the electrode 1. In this case, the electrode holder 2 is rigidly is connected to the link 4 by means of screws 20 and nuts 21. Moreover, the link 4 has an elliptical hole 5, the major axis of which is perpendicular to the direction of movement of the link 4. At the same time, a lever 7 is installed on the body of the air motor 6, which is configured to control a valve that regulates the supply of compressed air through branch pipe 8 connected to fitting 9 installed in air motor 6. The device for electrospark formation of coatings also contains a head 10, which is fixedly connected to the body of air motor 6 by means of screws (not shown in Fig.). At the same time, at the end of the shaft of the air motor 11, a cylindrical pin 12 is rigidly fixed by welding, the center of which is displaced relative to the axis of the shaft of the air motor 11 by the amount of eccentricity and which is configured to move along the inner surface of the elliptical hole 5 during the rotation of the air motor shaft 11. Moreover, the link 4 is made of steel and contains two elongated guide holes 13, which are oriented with their long side along the direction of movement of the wings 4 and into which two guide cylindrical pins 14 are threaded, symmetrically located relative to the center of the air motor shaft 11 and fixed on the surface of the head 10 by welding. Moreover, the major axes of the two elongated guide holes 13 are perpendicular to the major axis of the elliptical hole 5, and the minor axes of the two elongated guide holes 13 are coaxial with the minor axis of the elliptical hole 5. In this case, all cylindrical pins 12, 14 and part of the backstage 4 are closed with a cover 15 having a groove and fixed at the edges to the head 10 with four screws 22 (only two screws are shown in the figure). Moreover, an LED 16 is installed on the body of the air motor 6, designed to provide illumination of the zone of coating formation on the surface of the part in the zone of its contact with the electrode in the process of electrospark formation of the coating, which is activated using the button 19 located on the body of the air motor 6. At the same time, on the electrode holder 2, by means of a threaded connection, terminal 17 is fixed, designed for connection to the power supply wire (Fig. 1, 2).

The operation of the proposed device for electrospark formation of coatings is carried out as follows. Compressed air is supplied to the branch pipe 3 of the pneumatic motor 6, while a flexible wire (not shown in the figure) is connected to the terminal 17, which is connected to a power source (not shown in the figure), and a cooling agent is supplied to the branch pipe 8 to cool the electrode 1.

The pneumatic motor 6 is placed in the hand of the operator, who brings the electrode 1 to the workpiece to be alloyed. After connecting electric current to the flexible wire, the operator presses the lever 7, which controls the valve that regulates the supply of compressed air to the pneumatic motor 6, as a result of which the shaft of the pneumatic motor 11 is rotated and the cylindrical pin 12 moves along the surface of the elliptical hole 5 of the backstage 4. Due to displaced center of the cylindrical pin 12 relative to the center of the head 10 and the axis of the shaft of the air motor 11, the link 4 reciprocates. In this case, the electrode 1 also reciprocates with the same frequency and alloys the part. To change the frequency of the reciprocating motion of the electrode 1, the operator acts on the lever 7 of the air motor 6. As the electrode 1 wears out, the operator pulls it out and tightens it with the screw 18, and as the electrode 1 is completely worn out, it is replaced. Turning on the LED 16 is carried out using the button 19 located on the body of the air motor 6.

In the proposed device for electrospark formation of coatings, reciprocating motion of the backstage 4 is provided without the need to form a groove in the head 10 and without the use of a ball bearing due to the presence of cylindrical pins 12 and 14, provides light-dynamic protection from the pulsed impact of electric current discharges on the operator's eyes and illumination of the area formation of a coating on the surface of the part in the zone of its contact with the electrode during the electrospark formation of the coating due to the presence of LED 16, and the reliability of the current supply during the electrospark formation of the coating is ensured due to the presence of terminal 17 fixed on the electrode holder 2 by means of a threaded connection, to which a flexible wire is connected ( not shown in Fig.), which is connected to a power source (not shown in Fig.).

Industrial Applicability

The proposed device for electrospark formation of coatings meets the condition of "industrial applicability". The essence of the technical solution is disclosed in the formula, description and drawings clearly enough for understanding and industrial implementation by the relevant specialists on the basis of the current state of the art in the field of electrospark formation of coatings.

Claims (1)

A device for electrospark formation of coatings, comprising an electrode installed in the cavity of the electrode holder, having a branch pipe for connecting to a source of a cooling agent and configured to be connected to a supply electric wire and reciprocating with the electrode, while the electrode holder is rigidly connected to the link, and the link has an elliptical shape an opening, the major axis of which is perpendicular to the direction of movement of the wings, and an air motor, on the body of which there is a lever configured to control a valve that regulates the supply of compressed air through a pipe in the air motor, characterized in that it contains a head that is fixedly connected to the air motor housing, when At the same time, a cylindrical pin is rigidly fixed at the end of the air motor shaft, the center of which is displaced relative to the axis of the air motor shaft by the amount of eccentricity and which is configured to move along the inner surface of the above elliptical hole during the rotation of the air motor shaft, and the link is made of steel and contains two oblong guide holes, which are oriented with the long side along the direction of movement of the link and into which two cylindrical guide pins are threaded, symmetrically located relative to the center of the air motor shaft and fixed on the surface of the head, and small the axes of the two guiding elongated holes are parallel to the major axis of the elliptical hole, and the major axes of the two guiding elongated holes are coaxial with the minor axis of the elliptical hole, while all the cylindrical pins and part of the backstage are closed with a lid having a groove and fixedly attached to the head, and an LED is installed on the air motor housing , made with the possibility of providing illumination of the zone of coating formation on the surface of the part in the zone of its contact with the electrode in the process of electrospark formation of the coating, while on the electrode holder by means of threads The new connection has a terminal designed for connection to the power supply wire.

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