RU2326752C2 - Method of fabricating continuous cast deformed blanks out of high temperature metals and assembly for implementation of this method - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: crystalliser comprises two vertical facets designed to perform reciprocal movements and two inclined facets performing rotary movements. Before casting the inclined facets are heated by means of thermal pipes. Heat zones of the thermal pipes are assembled outside facets in cases for supplying heated gases and exhausting cooled ones; at that gas burners are installed in them. Cooling zones of the thermal pipes are located in vertical apertures in lower portions of the inclined facets. Along the inclined facets of the crystalliser there are placed two bands made out of cast metal. When heated facets achieve temperature t = (0.3-0.4) t_melt, where t_melt is a melting temperature of poured metal, then metal casting into the crystalliser with bands begins. The bands melt with a blank in the process of casting and simultaneous compression of the blank with the bands. During casting the facets of the crystalliser are cooled.

EFFECT: upgraded quality of blanks and increased output of proper metal.

2 cl, 2 dwg

Description

The invention relates to metallurgy, in particular to the production of continuously cast deformed billets.

A known method of continuous casting of metals [1. Patent RU No. 2077766. The method of continuous casting of metals and installation for its implementation / V.V. Stulov, V.I. Odinokov. Publ. 04/20/97. Bull. No. 11], including pouring liquid metal into the mold, introducing into the mold two ribbons along its inclined faces before pouring the liquid metal with their subsequent heating by gas and melting, forming a workpiece with simultaneous compression and calibration of its surface with continuous ejection, the tapes are made of cast material metal.

The disadvantage of this method [1] is that the heating of the tapes only with gas is insufficient to ensure the efficient operation of the installation due to the possibility of cooling the tapes and supercooling of the liquid metal in the mold at the beginning of casting. In addition, the lack of information about the mold cooling system makes it difficult to obtain continuous deformed workpieces from high-temperature metals and alloys.

The inventive method is aimed at creating a highly efficient process for producing continuous deformed billets of high-temperature metals and alloys (copper, steel).

The technical result obtained by the implementation of the proposed method is:

1. Increasing the yield of metal.

2. Improving the quality of the surface and internal structure of the workpieces.

The inventive method is characterized by the following essential features.

Restrictive signs: the introduction into the mold of two tapes made of cast metal material along its inclined faces; pouring liquid metal into a cooled mold and continuously pushing the workpiece while squeezing it with tapes and calibrating its surface; a mold having two vertical faces, made with the possibility of reciprocating movement, and two inclined faces, made with the possibility of rotational movement.

Distinctive features: before casting the metal into the mold, the inclined faces of the mold are heated to a temperature t = (0.3 ÷ 0.4) · _pl , where t _pl is the melting temperature of the cast metal.

A causal relationship between the set of essential features of the proposed method and the achieved technical result is achieved in the following.

Heating the inclined faces of the mold before casting metal into it eliminates the need for heating the tapes with gas and their melting, and also improves the quality of the surface of the workpiece due to the exclusion of overheating of the surface of the inclined faces.

Heating the inclined faces of the mold themselves to their temperature t <0.3 · t _pl (where t _pl is the melting temperature of the poured metal) before casting the metal reduces the yield of the metal due to its supercooling.

Heating the inclined faces of the mold themselves to a temperature of t> 0.4 · t _pl before casting the metal also leads to a deterioration in the quality of the workpiece and its internal structure due to the insufficient thickness of the crust of the workpiece of the cast metal. In addition, overheating of the inclined faces themselves leads to the failure of the mold.

To implement the proposed method, a device is claimed, the prior art of which is known [1, 2].

A known installation for producing continuously cast deformed billets of high-temperature metals [1] contains a mold, an intermediate bucket with a submersible nozzle, a device for introducing tapes, a device for supplying hot gas to the mold, while the mold is made with vertical faces that can reciprocate, and inclined faces, with the possibility of rotational motion.

A disadvantage of the known installation [1] is that the presence of a device for supplying hot gas to the mold is intended only for heating and melting gas tapes, as well as heating the surface of inclined faces. In addition, the lack of information about the mold cooling system, its operation and temperature control of the inclined faces does not provide a high-quality workpiece from high-temperature metals.

Also known prefabricated mold [2. Patent RU No. 2084311. Prefabricated mold for continuous casting of metal / V.V. Stulov, V.I. Odinokov. Publ. 07/20/97. Bull. No. 20], consisting of four working walls with water-cooled channels, the first pair of working walls is made with the upper, located at an angle to the vertical, and vertical lower sections of the working surface with the possibility of movement, and the second pair of working walls is made with the possibility of reciprocating movement, inside each water-cooled channel, a tube with a plugged end is installed, along the height of which holes for spraying water are made.

A disadvantage of the known prefabricated crystallizer [2] is that the lack of information on its heating makes it difficult to obtain continuous billets from high-temperature metals and alloys.

The technical result obtained by the implementation of the inventive installation is:

1. Improving the reliability of the installation.

2. Increasing the life of the mold.

The inventive installation is characterized by the following essential features.

Restrictive signs: an intermediate ladle with a submersible glass; a mold made with two vertical faces having the possibility of reciprocating motion, and two inclined faces made with the possibility of rotational motion; water-cooled canals in the faces; devices for heating the inclined faces of the mold; a device for introducing tapes into the mold; a thermocouple installed in an inclined face and connected to the automatic control system of the installation.

Distinctive features: devices for heating inclined faces; a device for heating inclined faces is made in the form of high-temperature heat pipes with cooling zones, which are located in vertical holes made in the lower parts of the inclined faces, and heating zones located outside the faces in the casings for supplying hot and removing cooled gases; inside each water-cooled channel, a tube with a plugged end is installed, along the height of which holes for spraying water are made.

The causal relationship between the set of essential features of the claimed installation and the achieved technical result is as follows.

The presence of a device for heating inclined faces in the form of a high-temperature heat pipe with heating and cooling zones [3. High-temperature heat pipes / V.I.Tolubinsky, E.N. Shevchuk. Kiev: Science. Dumka, 1989. 168 p.] allows you to organize highly efficient heating of inclined faces before casting metal by introducing heat into the inside of the face material and eliminate the need for a device for supplying hot gas to the mold. As a result, the productivity of the process is increased and the possibility of cooling inclined faces is excluded.

The implementation of vertical holes in the lower parts of the inclined faces allows you to place in them a device for heating the faces.

Placing the heat pipe cooling zone in a vertical hole made in the lower part of the oblique face enables highly efficient heat transfer from the heat pipe to the wall of the oblique face compared to heating the surface of the oblique face with gas.

The location of the heat pipe heating zone outside the face in the casing for supplying hot and removing cooled gases allows to organize highly efficient heating of the heat pipe to a predetermined temperature by supplying hot gases to the casing and removing cooled gases from it.

The location inside each water-cooled channel of the pipe with a plugged end, the height of which holes for spraying water are made, allows you to organize highly efficient cooling of the faces as a result of a several-fold increase in the heat transfer coefficient of sprayed water compared to its convective flow. In addition, spraying water inside each water-cooled channel can reduce water consumption by more than 10 times.

Figure 1 shows the appearance of the inventive installation; figure 2 is a section aa of figure 1.

The installation in FIGS. 1 and 2 consists of an intermediate bucket 1 with an immersion cup 2, a device 3 for introducing tapes 4, a mold 5 with vertical faces 6 and inclined faces 7 with water-cooled channels 8, inside which a tube 9 with a plugged end and holes 10 is installed for spraying water, a collector 11 for supplying water, vertical holes 12 at the bottom of inclined faces with heating devices 13 installed in them in the form of a heat pipe with a cooling zone 14 and a heating zone 15 with a casing 16 and a pipe 17, a gas burner 18 and a thermo Macaws 19.

Previously, tapes 4 are inserted into the mold 5 along the inclined faces 7 by the device 3, the gas burner 18 is turned on with the hot gases heating the heating zone 15 of the heating device 13 — the heat pipe — and removing the cooled gases through the pipe 17 from the casing 16. From the heating zone 15 of the heating device 13 - heat pipe - heat is transferred to the cooling zone 14 with heating the inclined face 7 of the mold 5. Thermocouple 19 connected to the automatic control system of the installation, the temperature is continuously fixed the inclined face 7. After the inclined face 7 reaches a temperature equal to (0.3-0.4) · t _pl , the gas burner 18 is turned off and the installation is ready for operation.

The method is carried out by the inventive installation as follows. From the intermediate ladle 1 through the immersion nozzle 2 into the mold 5, liquid metal is poured. At the same time, the water supply is turned on to the collector 11, which is sprayed through the tube 9 through the openings 10 in a water-cooled channel 8 with cooling of the inclined faces 7. After reaching the specified metal level in the mold 5, the drive of its inclined 7 and vertical faces 6 is turned on, as well as the supply of tapes 4 by the device 3. As a result, the inclined faces 7 rotate with compression and calibration of the surface of the formed workpiece and belts 4, and the vertical faces 6 make a reciprocating motion with continuous push pressing the blank from the mold 5.

In the case of casting steel and melting temperature t _PL = 1450 ° C, the heating temperature of the inclined face is 435-580 ° C.

Claims (2)

1. A method of producing continuously cast deformed billets of high temperature metals, comprising introducing into the mold having two vertical faces made with the possibility of reciprocating movement, and two inclined faces made with the possibility of rotational movement, two tapes made of material of the cast metal, along its inclined faces, pouring liquid metal into a cooled mold and continuously pushing the workpiece with simultaneous compression of it with tapes and calibration of its surface, characterized in that the heating is carried inclined faces of the mold to a temperature t = (0,3 ÷ 0,4) before metal casting _pl · t, wherein t _mp - melting point of the cast metal. 2. Installation for producing continuously cast deformed billets of high-temperature metals, containing an intermediate bucket with a submersible nozzle, a mold with two vertical faces made with the possibility of reciprocating movement, two inclined faces made with the possibility of rotational movement, and water-cooled channels made in it faces, devices for heating the inclined faces of the mold, a device for introducing tapes into the mold, a thermocouple installed in face and connected to the automatic control system of the installation, characterized in that it is equipped with casings for supplying hot and removing cooled gases with gas burners placed in them, and devices for heating the inclined faces are made in the form of high-temperature heat pipes with cooling zones that are placed in vertical holes made in the lower parts of the inclined faces, and heating zones located outside the faces in the casings for supplying hot and removing cooled gases, while and each water-cooled channel has a tube with a plugged end, the height of which holes are made for sawing water.

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