SU461802A1 - Apparatus for producing spherical cladding material - Google Patents

Description

one

A device for producing a spherical cladding material is known, which consists of a vacuum chamber, a spindle with a drive, a current lead, a spray supply mechanism and an electrode assembly with a manipulator.

The known device allows to obtain a spherical surfacing material by thermocentrifugal sputtering of the end of a rapidly rotating rod due to the melting of the end by an electric arc.

However, at the end of the remelting of the rod and the installation of another, the chamber must be depressurized. When spraying materials with a low thermal conductivity due to a large temperature difference between the melting end and the mass of the rod, the rod is cracked and destroyed during rotation. In addition, in the known device there is no forced cooling of the working bodies. Therefore, when spraying refractory compounds in an atmosphere of inert gases, overheating occurs and the main components of the device break down.

To increase productivity in the proposed device, the vacuum chamber is equipped with a water-cooled coil of triangular cross-section, covering the outer surface of the chamber along the perimeter, the spindle

made in the form of a water-cooled tank of heat-conducting material in a form corresponding to the material being sprayed, and the electrode assembly is made in the form of a block consisting of at least two electrodes with autonomous control.

To obtain material from the powders, the vacuum chamber is provided with a powder dispenser with individual vacuum.

FIG. 1 is a device for. spraying melted rods; in fig. 2 is a device for spraying powder.

The device consists of a camera 1,

spindles 2 and 3; and manipula tor 4. The camera 1 is scalded on the outer surface with a coil 5 of triangular cross section. In the upper part of the chamber there are windows 6, in the lower part of the chamber there is a collection 7 for spherical particles of the surfacing powder 8.

The vacuum chamber is equipped with cassettes 9, located in the upper inner part of it. The cassettes house the cores 10 to be remelted. The rods are replaced using two vacuum handled gloves 11. The spindles 2 and 3 are mounted in the center of the chamber and are replaceable. The spindle 2 is for remelting the rods, and the spindle 3 for remelting the powders. The spindles are made in the form of a Bodoo-cooled tank and consist of a housing 12, a drive 13 and a current lead 14. The spindle, designed for remelting the rods, is provided with a sleeve 15, a transitional graphite sleeve 16 and a water-cooled pusher 17 feeding the rods 10 to the remelting zone.

The spindle, intended for melting powders, also consists of a housing 12, a drive 13 and a current lead 14. In the upper part of the spindle there is mounted a crucible 18 cooled by water, which is fed through tube 19. When working with such a spindle, a dispenser 20 is mounted on the chamber lid 21.

The spindles 2 and 3 are provided with seals 22 and rotate in ball bearings 23, and they are attached to the camera body with removable bolts 24.

Manipulators 4 have hinges that provide three degrees of freedom for non-consumable electrodes 25, of which there must be at least two.

The device works as follows.

A vacuum is created in the chamber, after which it is filled with a protective gas, such as argon. Spindle rotation is turned on, and an arc is ignited between the transition graphite bushing and the non-consumable electrodes. The sleeve warms up and heats the core installed inside it to be sprayed. Then the arc is transferred to the end of the rod, a bath of molten metal is formed here, which, under the influence of centrifugal force, is placed in the form of droplets. The droplets crystallize in flight, acquiring a spherical shape.

As the rod melts, the rod is fed up with a water-cooled pusher.

The rod is replaced using vacuum handled gloves. In the cassette, mounted on the inner surface of the upper part of the chamber, there is a supply of rods, ensuring uninterrupted operation of the device without depressurization during two or three shifts.

The use of a transitional graphite bushing, inside of which are sprayed

rods, contributes to a more uniform temperature distribution along the entire length of the rod. As a result, internal stresses are reduced in the rod, and it does not crack and does not collapse when melted. The proposed device can also be used to obtain surfacing spherical powders from materials with low thermal conductivity.

During long-term operation in a stagnant atmosphere, the chamber is forcibly cooled by water running along a coil that encloses the outer surface of the chamber along the perimeter. The coil has a triangular cross section.

In the spheronization of the powders, the sprayed material is fed from the dispenser to the water-cooled crucible spindle 3, where it is melted by an electric arc. Melt by centrifugal force

rises along the inner walls of the crucible and sprays.

Replaceable spindles make it easy to rearrange the operation of the device when moving from spraying rods to spraying powders and vice versa.

Subject invention

Claims (2)

1. An apparatus for producing a spherical surfacing material, preferably carbides, containing a vacuum chamber, a spindle with a drive, a current lead, a spraying material supply mechanism, an electrode assembly with a manipulator, characterized in that, in order to increase productivity, the vacuum chamber is equipped with a water-cooled triangular cross-section coil covering the outer surface of the chamber along the perimeter, spindle made in the form of a water-cooled tank of heat-conducting material in a form corresponding to the material being sprayed, and the electrode assembly is made in the form of a block consisting of at least two Ear electrodes with autonomous control. 2. A device according to claim 1, characterized in that, in order to obtain material from the powders, the vacuum chamber is provided with a powder dispenser with an individual vacuum. 22 Zod Zod (j-e. . 2