RU12540U1 - DEVICE FOR ELECTRIC SPARK DOPING OF METAL SURFACES - Google Patents

Abstract

A device for electrospark alloying of metal surfaces, containing a rotating multi-electrode tool, in a cylindrical body of which elementary wire electrodes of various materials are supplied perpendicular to the axis of rotation uniformly around the circumference in the holes made in its body, powered by a single electric pulse generator through a brush collector and a housing characterized in that the device is equipped with a separate independent power supply system for various groups of electrodes ( ak least two), which includes electrodes insulators, busbars, generators and brush collector electrical pulses to each electrode group.

Description

-,:. MKIV23R1 / 18

DEVICE FOR ELECTRIC SPARK ALLOYING. METAL SURFACES.

The utility model relates to the field of electrospark processing and can be used in electrospark installations for electrospark alloying of surfaces with a mesh

A device for electrospark coating is known, which contains the main and high-pressure electrodes, separated from each other by a dielectric gasket, powered from the same current, but through different electrical circuits, working and initiating, from the supply, from the filling capacitance gonsedeksator installed in them, and the capacity of the storage censor in the working circuit is always greater than the capacity of the storage capacitor in the initiating circuit, (Bushik A.I., BPilov V.A. Some options for the method of electric spark lehr veniya povershyustey -. Elektrorshaya material processing 1991, 12 with 22-25 L). When the capacitor of the plug-in capacitor installed in a) electric circuit is charged, to the breakdown voltage of the interelectrode gap between the auxiliary electrode and the part, an electric discharge occurs, which distributes the discharge between the main electrode and the part. This allows maximum use of the energy potential of the source of labor}: notch1; ithmtls, increases the stability of the repetition of imp} -Files and. in the final1 1 result, it helps to increase the cohesion and uniformity of the resulting coatings. However, in view of gstaliya.rbo1K electric circuits from a single current source and the mandatory fulfillment of the condition under which the capacity of the filling co-capacitor installed in the working electric circuit must

OY1b is always larger than the capacity of the storage condensation set in KmBiHHpw im chain, it makes it impossible to independently change even 1 doping symbols (discharge energy per pulse, current} current values and voltage) for both electrodes. In the case of their manufacture from different materials it is not possible to zero complex coatings with a given percentage Leg-ir Tottsh-s components, since the intensity of transferring the material of the electrode (anode) to the surface of the part (cathode)

m / i

Hanpmi n o is associated with doping regimes and, especially, with the value

discharge energy, in pulse and repetition rate of the latter.

The most intricate in terms of technical nature is a device for electro-micro-complex coatings of various materials (at least two grade pasHtJX grades), consisting of a rotating multi-electrode tool, in the cylindrical cortgus of which elementary wire wires are located uniformly around the circumference in the holes soldered in its body electrodes made of various materials (at least 1 1, two different grades) about feeding from one generator, electrically: imp / ls through the collector and the casing (A.S. No. 528167 (USSR). Authlert ed by Khrut V.P., Bazylko A.G., Kornienko A, D). In this device, electrical impulses with identical characteristics (energy; discharge in impulse. frequency of their repetition) are supplied to electrodes of various materials. values of current currents and voltages). Yes. This device allows flooring of complex coatings consisting of components of various materials. However, in view of the identity of the characteristics of the electrical impulses 1 coming to the electrodes: the intensity of the transfer of their material to the surface of the part depends on the co-operability of Togo liiiii of the raw material mzhrirovat under the influence of electric discharges on the surface of the part. Thus, about the changed: a series of electric pulses that are transmitted to the electrodes, the proportion of materials transferred to the surface of the part is proportionally changed, which determines approximately the same structure11; en1:; the composition of the resulting complex coatings under different electrical modes of alloying makes it impossible to obtain complex coatings with a given percentage of components,

The theoretical problem to which the utility model is directed is the expansion of the technological capabilities of the device for the electrospark alloying of metal surfaces containing a multi-electrode rotating tool with elementary wire electrodes from various materials. Namely, the possibility of pollshenka complex coatings with the specified percentage of doping components: (metals, C1-based on them).

multielectrode rotating instrument} TU1enTz in the cylindrical body of which is uniformly circumferential, in the openings made in its i-spruce. perpendicular to the axis of rotation. groups of elementary wire electrodes of at least 2 different materials are located, equipped with a separate, independent power supply system for loose rpvnii electrodes, including :) insulators of electrodes, busbars, brush collectors and electric pulse generators (one for a group of electrodes )

The use of different power supply systems for groups of electrodes made of different materials and a separate electric pulse generator for each bulb allows independent control of electric spark alloying: for each group of electrodes and, thus, to regulate the rate of transfer of electrode material to the part in a predetermined proportion. This makes it possible (to form komksheksny coatings with a given percentage of almost any lightweight components in a wide range of discharge energies, and repetition frequencies of electric;

(LvTiTHOcTb utility model is illustrated by drawings fmg-.1 and fig-, 2.

The device includes the main elements: rod-type wire electrodes of material M1-L wire electrodes of material M2-2, VTU / holder. electrodes made of M1-3 material, together with holders of electrodes made of M2-4 material, together with insulators 5, retaining screws of electrodes b, c. -seen to the contact ring} / 11, isolated from the shaft 12 by a textolite sleeve 13, the contact ring 14. mounted on the shaft; copper-grevfit brushes 15 and 16 ,, sub-spring of brushes 17 and 18, electric generator generators 19 and 20, nut 21 for attaching the cylindrical body to the shaft, coupling insulator 22, electric motor. 23 drives of rotation of the housing with electrodes, alloyed part. 24.

The device works as follows}. From the electric motor 23, rotation through the coupling insulator 22 is transmitted to the shaft 12, and from it to the casing-adritary case 9 with wire electrodes. The cylinder core, gr / s is tightly mounted on the shaft and fixed from the axial movement: by nut 21. Wire electrodes stem; evo

type 1 and 2, from materials Ml and M2, respectively, rotate together with Q corsch 9 with frequency n and move relative to the part with speed V. Electric KNirR ubcbi are supplied from each separate generator to each electrode (from material Ml and M2), electric The wires from the generator 19 are sent by wire to: a copper graphite brush 16, then through a contact ring 11, a current supply bus 10, a sleeve-holder 3, to wire electrode 1 of material ML To wire electrode 2 of material M2. positive electric flows from the generator 20 through the wires, copper-graphite then brush 15. the contact ring 14, shaft 12, body} with 9 and the electrode holder 4, the negative electric img from both generators are wired to the processed (doped ) details 24. Electrodes are insulated from the electrical -1 with insulator sleeves 5, At the moment of the closest approximation of that other electrode, the end of the electrode and the surface of the alloyed part are driven by electric discharge (discharges), as a result of which, some h Part of the material of the electrode material will be transferred to the surface. Due to the fact that the material is passing; and: above the surface, the details of the electrodes are different. a complex coating will be formed on it, consisting primarily of these compounds: materials with (solid solutions, eutectics, intermetallic compounds). Due to the fact that the amount of material transferred from the electrode (anode) to the part (cathode) depends on the modes of the alloying process and, first of all, on the discharge energy in km / h ice and the frequency of electrical impulses, it is possible to independently change the alloying modes for electrodes from different materials can be effectively added by the percentage composition of the components of the coating to be obtained and a layer with the required exchanger-tag characteristics is obtained.

The proposed device is implemented on the basis of two independent generators of electric implosions with a transistor key in a discharge circuit and designed to operate on a spark (not linear) load.

the device is basic, it contained two electrodes from various materials with power supply from a common generator of electrical impulses. the second one, the proposed one, contained two electrodes of power electrodes from powered generators of electric impulses-OB. As materials for the electrodes, tungsten (W) and mo; zbden (Mo) were used. Specimens with dimensions 30x20x5 mm made of U10 steel, which were weighed on an analytical balance of the ADV-200M type, were subjected to electrospark alloying. The percentage ratio of transferred pia samples of MEGTERIALS was determined in proportion to the ratio of the decrease in the mass of electrodes from different gr. which were hanged before and after the alloying process. Many parameters of the alloying modes for the basic and proposed device variants during the tests were the same: the rotation frequency of the kortg / sa G electrodes, rpm;

-the speed of movement of the part relative to the tool,, 2 m / min;

- electrode feed, 5 mm / stroke;

- diameter of electrodes .0 mm;

- discharge energy in Shuttle, 25 J; -deisTButotnoe value of voltage Um-50 V;

current value of current

- doping time t-6 min.

The controlled parameter during testing of both options was the repetition rate of electric Schugschls supplied to the electrodes, which varied from 400 to 1000 Hz. Technical characteristics of the base and proposed devices are presented in table1, and

Those: sq. the biological characteristics of the results as a result of their tests - in table: 1e 2.

From table 2 it can be seen that the basic device with the power supply of both groups of electrodes (Mo / W) from one generator with a change in the repetition frequency of the electric ones, which allows changing the percentage of incoming :. it contains components ranging from 1 / 1.6 to 1.2 / 1, while a device powered by cast electrodes from individual generators allows you to change this ratio in the range from 1/4; 2 to 2.7 / 1.0, This clearly indicates the effectiveness of the proposed device.

Technical characteristics of devices for electrospark

Indicators

i Consumed by generators

electrical impulse power

Gig / Ice discharge energy

Electrical Frequency

IMG LLSOV

Actual value of voltage I

I RMS

The number of generators

TU

The number of grhtsh electrodes with j independent change in the electrical modes of alloying.

Number of electrodes per hour:

from molybdenum

from tungsten

Speed with electrodes

alloying.

Units 1 Devices for

electric spark

measurement I alloying

I Basic 1 Offer

volume

up to 0.5

up to 0.5

I0.04-0.3 I 0.

i 1

300-2000 I 300-2000

20-80

20-80

I OJ-5.2 I 0.7-5;

1.

PCS.

-1

 I lOO-lSOO

min

C-l

48

i

8

t

} "G

H W s about

cd

ta

k (W

u

5.

I- ;,

about a

s b

Jkc

i

E;

Cl

rt

Claims (1)

A device for electrospark alloying of metal surfaces containing a rotating multi-electrode tool, in a cylindrical body of which elementary wire electrodes of various materials are supplied perpendicularly to the axis of rotation uniformly around the circumference in the holes made in its body, powered by a single electric pulse generator through a brush collector and a housing characterized in that the device is equipped with a separate independent power supply system for various groups of electrodes ( ak least two), which includes electrodes insulators, busbars, generators and brush collector electrical pulses to each electrode group.