SU859018A1 - Plant for continuous producing of metal powder articles - Google Patents

Description

The invention relates to metallurgy, in particular, to installations for continuous production of metal powder products, in particular large-sized products of complex shape. A known device for the continuous production of products includes a liquid metal spraying chamber, in the upper part of which metal receiving and dispersing devices are mounted, and the lower 3 is a water-cooled copper crystallizer with a pulling mechanism for an item 0-1. The disadvantage of this installation is the inability to obtain products of complex Forma. Because of the limited possibilities for adjusting the configuration of the gas metal torch. Closest to the proposed technical essence and achievable effect is a device for non-deadly production of metal powder, including a chamber for spraying liquid metal with metal receiving and dispersing devices mounted in its upper part, with a device for console powder, placed at. bottom of the chamber, and the mechanism of drawing out the product. At the same time, the device for consolidating the powder out of the pulp in the form of two endless track belts. The disadvantages of this installation are the low quality of the products obtained and the limited technological capabilities caused by the impossibility of obtaining large-sized products and products of complex configuration. The purpose of the invention is to improve the quality of products and expand the technological capabilities of the installation. This goal is achieved by the fact that an installation for continuous production of products from metal powder, Spray switchboard, metal metal with metal-accepting and dispersing devices, mounted in its upper part, with a device for consolidating powder, grinding the bottom of the cowhide, and an exhauster nadeln, The device for consolidating the powder is made in the form of three series-connected wiring, forming a through channel with a cross section configuration corresponding to the shape of the product, and Izhaysha to the camera wiring is filled with thermally insulated,

The daily wiring is supplied with a heater, and the last one is made in the form of a cooled crystallizer,

FIG. 1 shows a diagram of the proposed installation, a longitudinal section; in fig. 2 section A-A in FIG. 1) in FIG. 3 diagram of the device for consolidation (horizontal version),

The proposed installation includes a chamber 1 for spraying a liquid metal, on the upper lid (not indicated) of which a dispersion device 2 is mounted, made i in the form of a multi-nozzle gas nozzle. On the dispersing device 2, a lined metal receptacle 3 is installed. The supporting wall 4 to amera 1 is sprayed with a water cooling system (with cooling jacket 5). A metal screen 6 is formed along the inner surface of the wall; a heat-insulating cavity 7 with a supporting wall 4 is installed. The insulating chamber 7 is connected with a device for consolidating the powder to its lower conical part.

Upper wiring 8 is completed by a two-stage. The inner wall 9 of this wiring forms a channel 10 with a cross section close to the product configuration, and in the upper part is joined with the screen 6 of the spray chamber l.SHyT Reny wall: 9 and the outer wall 11 of the wiring 8 form a closed annular heat-insulating space 12. At the bottom of the wiring 8 is connected with flange 13 to intermediate wiring 14 made of refractory material based on zirconium oxide. Internal stacks of wiring 14 form a through channel 15 that corresponds to the shape of the finished product and is a continuation of channel 10 of wiring 8i Intermediate wiring 14 is equipped with a heater 16 for local heating (melting) poro over the wiring section. The heater 16 is made in the form of a ring inductor,

With intermediate wiring 14, the bottom 5g wiring 17 is successively connected, which is a water-cooled copper crystallizer. The lower wiring 17 also has a through channel 18, which corresponds in shape to the configuration of the finished product and is a continuation of the intermediate wiring channel 15. 14 . Thus, the wiring 8 14 and 17 form a through channel with a cross section that corresponds to the shape of the finished product.

To prevent the powder from hanging in the wiring, the channels are made continuously extending to the outlet with a taper angle oL of 1-2 °. At the exit

From the last posting, the roller mechanism 19 for pulling has been installed.

LIAH.

The dispersion of the liquid metal in the installation is carried out with a high-pressure inert gas supplied to the nozzle device from the compressor 20. The hot exhaust gas from the spraying chamber 1 through the nozzle 21 enters the cyclone 22 for cleaning of metal dust and is fed further into the annular space 12 of the wiring 6 From the wiring 8 through the heat exchanging 23 and the filtering device 24 gas enters the inlet of the compressor 20. Thus, in the unit the inert gas is recirculated, which provides imalnye its loss and minimal contamination of the atmosphere.

The supply of liquid metal in the metal receiver 3 is carried out from a stopper bucket 25.

about

The installation works as follows.

Pre-wiring 14 and 17 inserts a seed made of the same material as the product. The inductor 16 of the wiring 14 is turned on. From the bucket 25 the liquid metal is poured into the preheated metal receiver 3 and enters the dispersing nozzle device 2, where it is crushed by high-speed gas jets on separate drops.

In the process of dropping the droplets in the spray chamber, they crystallize into a powder. At the same time, choosing the appropriate flow rate of gas supplied to the spraying ensures the final temperature of the powder 20-30 0 below the solidus temperature. The crystallized powder enters the upper wiring 8 and intermediate wiring 14. In Wiring 14, the upper end of the seed and the powder are heated to a temperature of 10-20 ° C higher than the liquidus temperature. The mechanism for drawing out the product turns on and the molten metal, following the seed, enters the wiring 17, where it crystallizes into the product.

Claims (2)

Thus, a continuous process for the production of a powder, its zone remelting and secondary crystallization is carried out in the plant. The supply of hot gas to the interstitial space 12 of the wiring 8 maintains the wiring temperature at a temperature close to the powder temperature and eliminates the possibility of its overheating, since the melt temperature slightly exceeds the liquidus temperature, the final product has a fine-grained isotropic structure close to the structure of the original powder. The narrow metal remelting zone provides a high rate of its crystallization in wiring 17 and the absence of foundry defects in the product. Thus, the application of the proposed plant allows improving the quality of the products and expanding the technological capabilities of the equipment. Claims of the Invention Plant for continuous production of metal powder products, including a liquid metal spraying chamber with a metal receiving and dispersion device mounted in its upper part, a device for consolidating powder located in the lower part of the chamber, and a machine for stretching the product about it In order to improve the quality of the products and expand the technological capabilities of the installation, the device for consolidating the powder is made in the form of three series-connected rovodok forming dtsih bore therethrough with a sectional configuration corresponding to the shape of the article, the chamber closest to the wiring is thermally insulated, the intermediate wiring is provided with a heater, and the latter is in the form of a cooled crystallizer. Sources of information taken into account in the examination 1. The author's certificate of the USSR 469530, cl. At 22 O 11/04 ,. 1973. 2. Authors certificate of the USSR 495158, cl. B 22 F 3/14, 1974. / 1-X)