SU577092A1 - Apparatus for obtaining metal powder - Google Patents

Description

one

The invention relates to powder metallurgy and can be used to obtain pure granular powders from steel melts and high-temperature alloys in a vacuum.

Apparatuses for producing metal powder are known, comprising a sealed chamber with a ladle in which the spray mechanism is mounted in the form of two driving drums and the conveyor belt placed under them.

spraying can be carried out in a neutral or reducing atmosphere. Gas and water coming from the nozzles contribute to the atomization of the metal. The drums can rotate at different speeds, in different directions.

The design of the device does not provide pure granular powders of high alloy steels and. heat-resistant alloys, since inert or neutral gases are used in the chamber, which violate the purity of the granular poroics. The tundish has no preheating of the melt before spraying and is located in the center pi of the vertical axis of the chamber with the direction of the jet of liquid

metal only between rotating drums, which does not ensure fine crushing of the metal. Drums have smooth working surfaces, which also does not provide the desired dispersion of the granules.

In order to increase the geometric uniformity of the granule, the porchika device is equipped with a two-strand funnel placed under the bucket, each of the streams of which is directed to the corresponding drum, with ems on the working surfaces of the drums the blades are made.

Fig, 1 shows the proposed device, a general view; in fig. 2 shows section A-A in FIG. I; in fig. 3 section bb in fig. 2

Claims (1)

The device contains a sealed chamber 1 connected to a vacuum system (not shown), a coolant tank 2, a two-handle casting funnel 3 with an elenant heater, a tundish with sealing gaskets in the form of a low-melting metal plate 5, a melt-melting mechanism, the states of two blade drums 6 with a drive 7. The drums can be moved in the horizontal and vertical planes in order to select the optimal geometrical arrangement of the drums with respect to the filling funnel 3 The rotation of the drums b in opposite directions is carried out from the electric motor (not shown) through the cylindrical wheel 8, the bevel gear 9 and the cardan gear 10. Vac 2 for cooling liquid (with a mechanical screen with sorting frames) has a window for extracting metal granules with with the help of the trolley 11, as well as the drain nipple 12 and the opening for the wafer of the thermocouple 13. The filling funnel is equipped with inserts 14. The device works as follows. The sealed chamber 1 is vacuums, the filling funnel 3 is heated, BCJ rotates the paddle barbayas 6, after which the molten metal of the open smelting is poured into the intermediate bucket 4. After the melt of the low-melting plate 5 melts, the metal from the tundish 4 enters the pouring funnel 3 and through the insert 14 onto the rotating drums b, by means of which the metal is sprayed. After crushing, the resulting liquid droplets enter the coolant tank where they undergo crystallization. At the end of the granulation process, the coolant from tank 2 is discharged through pipe 12 (after filling the chamber with air). Then a window opens through which the cart 11 rolls out to remove the finished granules Powder, Silicone oil with low vapor pressure, for example FM-1322/300, can be used as a coolant. containing a sealed chamber with a metal bucket, in which the spraying mechanism is mounted in the form of two drive drums and a conveyor belt located therein, in order to increase the geometric uniformity of the powder granules, it is equipped with a two-strand funnel placed under the bucket, each of the streams is directed to the corresponding drum, while the blades are made on the working surfaces of the drums Sources of information taken into account during the examination: 1. UK patent 1336028, class 7X, 1973. 2