Installation for fabrication of continuous nano-metal billets

FIELD: metallurgy.

SUBSTANCE: disclosed installation consists of casting tank with two rows of ports and fissured moving grate and of crystalliser with two pairs of vertical walls. The first pair of walls of the crystalliser is made in form of heat pipes with heating and cooling devices; this pair is designed to perform reciprocal motions, while the second pair is designed to perform rotating motions and converge; it has expanded upper and vertical lower sections. In the middle part of the casting tank there is located an additional tank with a stop and an immersing casting cup. Metal in amorphous state comes to expanded sections of crystalliser walls from the casting tank overcooled below temperature of crystallisation. Simultaneously overheated metal comes from the additional tank to the centre of the crystalliser. Separate supply of the same metal with different temperature into the crystalliser creates conditions for producing nano-crystal structure of the billet.

EFFECT: increased efficiency of production of nano-crystallised billets.

2 cl, 2 dwg

 

The invention relates to metallurgy, in particular to devices for continuous nanocrystalline blanks.

A device for producing continuous deformed pieces of shredded materials [1. Patent RU No. 2198054. The method of obtaining continuous deformed pieces of shredded materials and device for its implementation / VV Chairs, Vigodnikov, Viertola, Benarin. Publ. 10.02.2003. Bull. No. 4], containing the heated casting tank with two rows of holes and a slit moving grating, a mold, a pair of vertical walls which are executed with the possibility of reciprocation, and the second pair - with the possibility of rotational movement and details of the walls and has in the upper part of the extended section with an angle of inclination to the vertical and a vertical lower portion, the reel with the tape, a container of powdered material and a dispenser located in the middle part of the heated filling capacity, lock, trailing ribbons.

A disadvantage of the known device consists in the impossibility of obtaining it from the crushed material nanocrystalline blanks, consisting of nanocrystals.

The technical result obtained by carrying out the inventive device consists of:

1) the ability to obtain a continuous the different nanocrystalline blanks;

2) to improve the performance of the process of obtaining nanocrystalline blanks.

The inventive device is characterized by the following essential attributes.

Restrictive signs: a device for obtaining a continuous nanocrystalline preparations containing casting tank with two rows of holes and a slit moving grating, the mold, the first pair of vertical walls which are executed with the possibility of reciprocation, and the second pair - with the possibility of rotational movement and details of the walls and has an expanded section with an angle of inclination to the vertical in the upper part and lower vertical section.

Distinguishing characteristics: filling capacity for pre-prepared supercooled below the crystallization temperature of the metal, which is in amorphous state, made with extra capacity for superheated liquid metal homogeneous supercooled metal, located in the middle part of the casting vessel and containing the stopper and dipping the nozzle, the vertical wall of the first pair is made in the form of heat pipes, channels which are filled with fluid containing a heating device and cooling device, where the device contains two thermocouples located at different depth is in the mould, thermocouple is installed in the metal vertical walls of the mold and the system of automatic control of the mold. In addition, the distance between the lower vertical sections of the mould walls of the second pair when their intelligence is δ=1-3 mm

A causal relationship between the set of essential features of the claimed device and achievable technical result is the following.

Split feed into the mould of the same metal with different temperature leads to a shift of the equilibrium diagrams of the alloy to non-equilibrium, which reduces the residence time of the crystals in ideal conditions and requires less fluctuations of the composition for the implementation of the embryos in the volume of the melt. In particular, this applies to 2 or more component systems, in which the compositions of the embryo and melt are different depending on the temperature.

At the stage of nucleation of crystals ratio in the compositions of the solid and liquid phases must be such as to ensure good wetting [Golikov, I.N., The Maslenikov D.B the Dendritic porosity in steel. M.: metallurgy, 1977. P.21].

In two-component systems, the activity of the components a and b are different and the process of pumping of atoms in the system, crystal-liquid, which should lead to the formation of stable nuclei, but the AK was noted, takes a long time and is the equilibrium temperature.

Separate supply of the same metal with different temperatures creates a temperature gradient in the melt required for the rapid development of the process and its translation in a non-equilibrium state. In addition, the heat in the mould modifies the kinetics of the process, and create conditions for the implementation of non-equilibrium growth forms.

Mixing superheated and supercooled liquid metal in the mould affects the size and shape of the nuclei rtoin one-component system, which follows from the formula [Golikov, I.N., The Maslenikov D.B the Dendritic porosity in steel. M.: metallurgy, 1977. P.16]

,

where σ is the surface tension between the solid and liquid phases; M - molecular mass; T0- temperature equilibrium crystal-liquid; T is the temperature of the supercooled liquid metal; ρ is the density of the embryo; q is the heat of melting metal.

Under other equal conditions temperature T0and T can vary. From the above formula it follows that reducing a (T) term (T0T) increases, and the size of the Bud rtoreduced. With increasing T0rtoincreases. In addition, with increasing melt temperature varies σ, and accordingly rto.

For granicetrona the Oh of the cubic lattice (iron, Nickel) anisotropy of σ does not exceed 15% [Golikov, I.N., The Maslenikov D.B the Dendritic porosity in steel. M.: metallurgy, 1977. P.21], but this is enough for directional heat sink was developed in the form of the embryo, so that the energy costs of the formation of a new surface will be minimal.

Filling filling capacity pre-prepared supercooled below the crystallization temperature of the metal, which is in amorphous state, eliminates the need for cooling of the metal at high speed in the mould to obtain the amorphous state.

Running in the middle part of the filling capacity additional capacity for superheated liquid metal, homogeneous supercooled metal containing stopper and dipping the nozzle, allows you to draw in the center of the mold superheated liquid metal and mix it with supercooled below the crystallization temperature of the metal, which is in amorphous state.

Running a pair of vertical walls of the mold in the form of heat pipes with channels filled with fluid and are equipped with heating devices, cooling devices heat pipes, allows you to warm up vertical walls before filling the mold with metal and adjust the cooling process Cree is tallization metal.

The presence of two thermocouples located at different depths in the mould lets you get signals about the temperature of the metal in the mould and to manage the process of formation of nanocrystals.

The presence of thermocouple to the metal vertical walls allows to obtain a continuous signal on its temperature when heating and cooling.

A system of automatic control of the mould enables you to operate the device during the entire process of obtaining a continuous nanocrystalline blanks.

When the distance between the lower vertical sections of δ<1 mm of the walls of the second pair being in a flattened condition, imposes unreasonable excessive demands on the technology of manufacture and Assembly of the mold, complicates the management process of obtaining nanocrystalline blanks.

When the distance between the lower vertical sections δ>3 mm of the walls of the second pair being in a flattened condition, it is impractical to increase the volume of material placed in the mould, and complicated management process of formation of nanocrystals and obtain nanocrystalline blanks.

The device illustrated by the drawings. Figure 1 shows a view of the device; figure 2 - cross section a-a figure 1.

The proposed device consists of filling emkosti for supercooled metal with holes 2, the moving grating 3 with slits 4, mechanisms 5 moving gratings, capacity 6 to superheated liquid metal, the stopper 7, submersible filling of the Cup 8, the mold 9 with the first pair of vertical walls 10 and the second pair of walls 11 extended in the upper part of the section 12 with an angle of inclination to the vertical and a vertical lower section 13, thermocouples 14 and 15 connected in the system of automatic control of the mold. The vertical wall 10 is made in the form of heat pipes with 16 channels filled with fluid and equipped with a heating device 17 and the cooling device 18, thermocouple 19.

Before filling of the mold 9 metal second pair of walls 11 is installed in a position in which the vertical lower parts are at a distance δ=1-3 mm from each other. The system of automatic control of the mold 9 includes a heating device 17 to the heating of the vertical walls 10 to a temperature that depends on the brand of cast metal and controlled by the probe 19.

The operation of the device is as follows.

Through holes 2 in the filling of the tank 1 and the slit 4 in the bars 3 by means of the mechanism 5 moving gratings supercooled below the crystallization temperature of the metal, which is in amorphous state, Postup is et in the mold 9 extended in the upper part of the sections 12 with an angle of inclination to the vertical of the second pair of walls 11. At the same time from the tank 6 by the stopper 7 through immersion the nozzle 8 superheated liquid metal enters the center of the mold 9. After filling of the mold 9 metal, and obtaining information about the temperature readings of thermocouples 14 and 15, the system of automatic control of the mold off of the heating device 17 mounted in the vertical wall 10 with a channel 16. Enables the actuator walls of the mold. In the second pair of walls 11 performs complex rotational motion with deformation of nanocrystals on advanced at the top of the sections 12 with an angle of inclination to the vertical and calibration of the surface of the nanocrystalline material on a vertical bottom sections 13, and a pair of vertical walls 10 performs a reciprocating movement with the ejection of the workpiece from the mold. In the future, depending on the temperature of the metal in the mould, which is controlled by thermocouples 14 and 15, as well as thermocouple 19, the system of automatic control of the mold to set the required flow of cooling medium in the cooling device 18, and the drive speed of the mould walls providing a continuous nanocrystalline billet.

1. Apparatus for producing continuous nanocrystal is symbolic of the workpieces, containing casting tank with two rows of holes and a slit moving grating, the mold, the first pair of vertical walls which are executed with the possibility of reciprocation, and the second pair - with the possibility of rotational motion and information walls, and having a widened section with an angle of inclination to the vertical in the upper part and a vertical lower portion, characterized in that the filling capacity for pre-prepared supercooled below the crystallization temperature of the metal, which is in amorphous state, made with extra capacity for superheated liquid metal, homogeneous supercooled metal, located in the middle part of the casting vessel and containing the stopper and submersible the nozzle, the vertical wall of the first mold pair is made in the form of heat pipes, channels which are filled with fluid containing a heating device and cooling device, where the device contains two thermocouples located at different depths in the mould, a thermocouple, installed in metal vertical walls of the mold, and the system of automatic control of the mould.

2. The device according to claim 1, characterized in that the distance between the lower vertical sections of stenotritidae second pair when their intelligence is δ=1-3 mm.



 

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The invention relates to the field of metallurgy

The invention relates to the field of metallurgy

The invention relates to metallurgy, and in particular to continuous casting with simultaneous deformation of the metal in the workpiece of a given range

The invention relates to the field of metallurgy

The invention relates to the field of metallurgy

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