FR2521461A1 - INSTALLATION FOR SEMI-CONTINUOUS CASTING OF METALS - Google Patents

Abstract

THE INSTALLATION INCLUDES AN OVEN-MIXER 1, A RECEIVER-PNEUMODISTRIBUTOR 2 ON WHICH IS PLACED A LINGOTIER 6 EQUIPPED WITH A COOLING CIRCUIT AND IN THE UPPER PART OF WHICH IS PLACED A PRIMER 9 WHICH COUPLES TO A SYSTEM OF COOLING. EXTRACTION OF THE HALF-PRODUCT FROM THE LINGOTIER. THE LINGOTIER COOLING CIRCUIT IS EQUIPPED WITH A DEVICE 8 FOR FORCED DELIVERY OF THE COOLING LIQUID USING COMPRESSED GAS. PRIMER 9 CONSISTS OF A CENTRAL HEAD 10, IN WHICH ARE PLACED A HEATING ELEMENT 11 AND AN ADJUSTABLE VALVE 12 FOR THE ADMISSION OF NEUTRAL GAS INSIDE THE HALF-PRODUCT. THE SYSTEM FOR THE EXTRACTION OF THE HALF-PRODUCT FROM THE LINGOTIER INCLUDES TWO MECHANISMS 15, 16, WHICH ARE IN TURN COUPLED TO THE PRIMER 9. THE INVENTION CAN BE APPLIED TO THE SEMI-CONTINUOUS CASTING OF METALS, AT THE SAME TIME. ELABORATION OF HALF-PRODUCTS OR HOLLOW WITH EXTRACTION FROM THE TOP OF THE LINGOTIERE.

Description

The present invention relates to installations for the casting of

  metals, and in particular the installations

  for semi-continuous casting of metals.

  The invention can be applied in the field of semicontinuous casting of metals, in the production of solid and hollow semi-finished products with extraction from the top of

the mold.

  In recent years, all over the world,

  more and more systems for continuous and semi-continuous casting of metals, which, unlike

  traditional casting in ingot molds or molds

  units, to reduce the production cycle of semi-industrial

  products, to lower labor costs, to increase the yield of healthy products, to increase

  production, to improve working conditions, half-time

  continuously cast products with good structure and

good properties.

  We know an installation, for the implementation

  of a continuous casting process with extraction of

  flow from the top of the mold (see, for example,

  Japanese Patent Publication No. 045-39345 of 11 12 70, cl.

  B 22 D 11/14), comprising a sealed chamber for the liquid metal, a water-cooled mold immersed in the liquid metal, and a primer for the extraction device

from the semi-finished product to the mold.

  The construction of the installation makes it possible

  ler the hollow semi-products by admission of the liquid metal

  in the mold from the bottom It is then formed on the surface

  active face of the mold a solidified layer and a

  mid-solid layer (solid-liquid phase) adjacent to the

  solidified che When the total thickness of both

  layers reaches a predetermined value, we proceed to the

  lowering the meniscus of the liquid metal to the level of

  the lower part of the mold Afterwards, after

  of the mid-solid layer, the end

  inferiority of the solidified section with respect to

  up to its upper edge and the meniscus of the

  to the lower end of the solid section

  Difie. The cooling system of the ingot mold of said installation does not include any device making it possible to drive the coolant out of the mold, so it does not make it possible to act on the cooling system.

  formation of the skin of the half-product.

  In addition, the said installation has no provision

  to improve the quality of the inner surface of the

half-cast product.

  There is known a facility for continuous casting

  metal (see, for example, U.S. Patent No. 3302252, Cl 22-57 2, 1967), wherein

  extraction of the semi-finished product is planned from the top of the

gotière.

  The installation includes a device for

  liquid metal feed from a pneumatic (or pneumatic) metal receiver with a metal conduit, an ingot mold with a cooling circuit, placed on the metal pneumatic receiver, and a primer

  placed in the upper part of the mold and

  coupled with a mechanism for extracting the semi-finished product from the mold The installation also includes a means for

  the creation of pressure in the pneumodistri-

  metal scorer and a device for the vibration of the liquid metal.

  We can run in the installation a half

  tubular duct, the wall of which forms on the active surface

  When the liquid metal is admitted to it, the semi-product formed is continuously extracted from the top of the mold, via the primer, coupled to the extraction mechanism of the half-product. product one is raising and lowering the level of

  liquid metal in the zone of the mold With the aid of

  positive for the vibration of the liquid metal.

  The described installation does not provide for the admission

  injection of an inert gas into the molded half-product.

  In such conditions of movement of the meniscus of

  in the ingot mold area, the inner surface

  of the layer formed may oxidize, and during the

  the meniscus, the newly formed layer

  may not join the skin of the semi-finished product, which

  lower the quality of the half-product, and in the case of casting, for example, aluminum alloys, this may be the cause

scrap.

  The object of the invention is to eliminate the inconveniences

venents listed above.

  It has been proposed to create an installation for the semi-continuous casting of metals, of such design that it would allow the casting of semi-finished products which do not require subsequent scouring of the outer surface and the surface.

inner surface.

  The solution consists of an installation for the semi-continuous casting of metals, comprising a furnace-mixer,

  a receiver-pneumodistributor of metal connected to said furnace

  mixer by a closed system for the transmission of

  quide and equipped with a metal conduit, an ingot mold with a

  cooling circuit, placed on said receiver-tire-

  modulator, and a leader who places himself in the

  of said mold and mates with a device for extracting the semi-product of the mold, installation

  in which, according to the invention, the cooling circuit

  The ingot mold is equipped with a device for the forced discharge of the coolant out of the mold with the aid of a compressed gas, the primer comprises a central head in which are placed a heating element

  and an adjustable inert gas inlet valve within the

  half-product during casting, and the extraction device of the semi-finished product of the mold comprises two

  mechanisms for extracting the semi-finished product from the ingot mold,

  coupled in turn to the leader, one of them assuring the ex-

  drawing of the semi-finished product of a length at least equal to the difference between the length of the semi-finished product and the length

  of the ingot mold, and the second, of a length at least equal

the length of the mold.

  Such an embodiment of the installation for the

  semi-continuous casting of metals allows the casting of half

  products whose surface and structure are of high quality.

  méliorée. One of the extraction mechanisms of the semi-finished product

  may include a movable tray with an arm for

  primer and an actuator, and the other mechanism for extracting the semi-finished product from the mold can include a movable bar moving in roller guides, with racks and an element for coupling to

the primer, and an actuator.

  Such an embodiment of the extraction mechanisms

  of the semi-finished product makes it possible to ensure the desired regime of extrac-

  the semi-finished product out of the mold and to reduce the dead time during the transition to the casting of the semi-finished product

following.

  It is advantageous, in the case of elaboration of

  semi-finished products, to equip the installation for the

  semi-continuous metal of a device for drilling and calibrating the channel in the semi-finished product,

  this device in the form of a drilling tool and

  liberation amounting to the lower part of the central head

  and an actuator, the role of which is played by the ac-

  one of the extraction mechanisms of the semi-pro-

duit the mold.

  The use of such a device makes it possible to sink

  semi-finished products With a calibrated inner surface of

  liorée. In what follows, the invention is described in an exemplary embodiment with reference to the accompanying drawings, in which: FIG. 1 represents an overall view of a

  installation for semi-continuous casting of metals,

  form to the invention, in section along the main axis of the installation;

  Fig 2 represents the central head of the

MORCE;

  Fig 3 is a top view of the

  MORCE; Fig. 4 shows the pivoting sections of the secondary cooling zone;

  Fig. 5 shows the closed system of trans-

  transferring the metal to the metal receiver-pneumodistributor from the furnace-mixer; Fig 6 shows the supply diagram of the mold in coolant; Fig 7 shows a sectional view along the line VII-VII of Figure 3; FIG. 8 represents the primer with the tool of

drilling and calibration.

  The installation for the semi-continuous casting of metals, according to the invention, comprises an oven-mixer

  1 (Figure 1), which is connected to a receiver-pneumodistri

  scorer 2 of metal by a closed system 3 of metal transmission A pressurized gas supply circuit 4 is connected to the receiverpneumodistributor 2 of metal On the upper cover of the receiverpneumodispenser 2 of metal is mounted a conduit 5 of metal with a heated flange connects to the duct flange 5 a cooled mold

  6, comprising a cooling circuit with a capacity of

  cited 7 feed and a device 8 for the repression

  forced coolant out of the channels

  of the mold with a compressed gas.

  The installation comprises at least two primers 9 which are placed in turn on the mold 6 before

  the beginning of the casting of the next half-product.

  Primer 9 has a central hole in which is

  mounted a central head 10 Said head 10 comprises a

  The heating element 11 (FIG. 2) and an adjustable valve 12. The head 10 has two holes connecting to a circuit 13 (FIG.

1) inert gas supply.

  The primer 9 comprises two uprights 14 (FIGS. 1, 3) with holes, with which the primer 9 is accom-

  15 (FIG. 1) or 16 for extracting the half

  produced in the mold; when the primer 9 is coupled to the mechanism 15 for extracting the semi-finished product, it is the fingers 17 of the arm 18 which are engaged in the holes of the uprights 14, and when it is coupled to the extraction mechanism 16

  of the semi-finished product, it is the fingers 19 (FIG. 3) of the oven

  mobile cheek 20 spring with a cutout 21 which are engaged

  in the holes of the uprights 14 The fingers 19 of the oven

  che 20 and its cutout 21 are centered so that the fingers 19 can engage in the holes of the uprights 14 of the primer 9, and that the fork 20, thanks to its cutout 21,

  can engage in the housing of the mechanized element.

  16 of extraction of the semi-finished product (Figure 1).

  my 15 and 16 extraction of the semi-product of the mold constitute the device for extracting the half-product out

of the mold.

  The extraction mechanism of the semi-finished product

  takes an actuator (not shown in the drawing), a screw 22 of translation-and a plate 23 The plate 23 is supported on the screw 22 of translation and slides relative to

  fixed guide columns (not shown in the drawing).

  The plate 23 carries the arm 18 with fingers 17 and movably mounted. The mechanism 16 for extracting the semi-finished product is mounted on a carriage 24 which can move along

  beams 25, mounted fixed above the installation.

  Above the mold 6, along a length corresponding to the length of half-product 26 extracted from the mold 6, is the zone 27 of secondary cooling, consisting of paired pivoting sections.

  in the form of at least two shoes 28 (

  4), fixed on arms 29, the length of said pads 28 being smaller than the length of the mold 6

  (FIG. 1) and chosen preferably equal to the length

  maximum of the portion of half-product 26 can be extracted from the mold 6 in an extraction cycle. The installation has some peculiarities

  design, consisting of the following.

  The closed metal transmission system 3 of the oven-mixer 1 to the receiver-pneumodistributor 2 comprises

  a device closing the taphole, this device e-

placed in a room 30.

  The closed system 3 for transmitting the metal from the oven-mixer 1 to the receiver-pneumodistributor 2 comprises

  a taphole 31 (FIG. 5), made in a refractory block

  32 and closed by a buffer 33 which is placed in a frame 34, by means of which it is clamped against the refractory block 32 The clamping of the buffer 33 with the frame 34 against the refractory block 32 is effected at

  The mount 34 is coupled to a lever.

  36 which is supported on supports 37 by means of an axis 38 and is operated by an actuator 39, mounted on the c 8 tee.

outside the room 30.

  The metal conduit 5 (FIG. 1) has in its wall,

  below its heated flange, a hole to which

  a tube 40, placed in communication with the circuit 4 of a-

  pressurized gas supply A shut-off valve 41

  is provided in the circuit 4. The end of the tube 40 is

  tapered, widening towards its exit in the con

  The inner wall of the tube 40 is oppositely coated.

  placing the metal cast in the tube 40

  tube 40 and its lining make it easy to

  turn of the metal could penetrate the tube 40 during the

operation of the installation.

  The cooling circuit of the mold

  with its feed capacity 7 (Figure 1) and the

  tif 8 for the delivery of coolant out

  of the mold comprises a tap 42 (FIG.

  compressed air to the mold 6, mounted on the con-

  picking 43 discharging the coolant from the lingo

  In the line 44, which transmits the cooling liquid from the slaking capacitor 7 to the mold 6, a series 6 is mounted in series.

  bypass valve 45 for the return of the cooling liquid

  power supply 7 and a closed capacitor 46, equipped with a liquid level indicator 47

  cooling in said closed capacitance

  supply tee 7 and the bypass valve 45 is mounted

  a tube 48 for returning the coolant.

  Mechanisms 15 (Figure 1) and 16 Extraction

  half-product outside the mold 6 are made from

  that they can be quickly coupled to the primer 9 and decoupled from this primer 9 in a predetermined sequence First, the primer 9 (FIG. 7), comprising

  uprights 14 with holes 49, is coupled to the mechanism

  15 (Figure 1) with the fingers 17 which are attached to the arm 18, being movable in guides of the movable plate 23 The stroke of the movable plate 23 of the mechanism 15 for extracting the semi-finished product is limited to length at

  less equal to the difference between the length of the half

  26 to flow and the length of the mold 6.

  The mechanism 16 for extracting the semi-finished product,

  placed on the carriage 24 is designed to ensure the ex-

  pulling the semi-finished product 26 with a length at least equal to the length of the mold 6 This mechanism comprises roller guides 50 in which a bar 51 is mounted, which racks 52 are engaged with a pair of drive pinions. 53; said bar 51 carries at its lower end an element 54 provided with housings,

  using which the bar 51 mates with the fork 20 (fi

gure 3) mounted on the primer 9.

  In the case of producing a hollow half-product

  The installation is equipped with a device for

252 1461

  and the calibration of the channel of the semi-finished product 26

  tif is made in the form of a tool 55 (FIG. 8) for drilling and calibration, mounted at the bottom of the central head 10, and an actuator whose role is played by the actuator 56 (FIG. 1) of the mechanism 16 of

pulling the half-product.

  The element 54 of the bar 51 is made so that its coupling to the shank 57 (FIG. 8) of the tool 55

  for drilling and calibrating and disconnecting from

  with this tool 55 be fast, and the length of the bar-

  re 51 (Figure 1) is such that it allows the displacement of the central head 10 of the entire length of semi-product

26 to sink.

  In the head 10 (FIG. 8) is disposed a

  pope 58 with which an inert gas is admitted to 1 '

  interior of the semi-finished product 26 under development.

  pope 58 is coupled to a piston 59 In the media part

  10 of the central head 10 are made two radial holes and 61 The hole 60 is in communication with the chamber 62 in which the piston 59 moves, and the hole 61 is

  in communication with Chamber 63, in which

valve 58.

  The central head 10 mounts in the hole 64 of the primer 9 and is locked with pins 65 and 66, which are engaged in sockets 67 and 68 The pins and 66 have radial and axial holes The hole radial axis 65 places its axial hole 69 in communication with the hole 71 of the upright 14 of the primer 9, which is in communication with the radial hole 72 (FIGS. 7 and 8) of FIG.

  finger 17 of the mechanism 15 (FIG.

  product, this hole 72 itself being in communication with

the axial hole 73 of said finger 17.

  At the end of the finger 17 (FIG. 7), the hole 73

  is connected by a coupling 74 to a flexible food hose 75

compressed gas.

  The radial hole 77 (FIG. 8) of the pin 66

  its axial hole 76 in communication with the hole 78 of the

  both of the primer 9, which is in communication with the radial hole 80 of the finger 82 of the extraction mechanism 15.

  half-product (FIG. 1), this hole 80 being in itself

  communication with the axial hole 81 of said finger 82. At the end of the finger 82 (Figure 8), the hole 81 is connected to a hose (not shown in the drawing)

inert gas supply.

  The installation according to the invention, in the case of production of round half-products, operates from the

following way.

  First, preparatory operations are carried out

  The duct 5 (FIG. 1) of metal is heated up

  At a temperature close to the melting point of the metal to be poured, the primer 9 is placed on top of the mold 6,

  that is coupled to the extraction mechanism of the half-pro-

duit with the help of fingers 17.

  Next, an inert gas (for example argon) is blown into the metal receiver-pneumodispenser 2 and the chamber 30 of the closed metal transmission system 3.

  to create an inert atmosphere.

  This done, it opens the tap hole 31 (Figure) by moving up the frame 34 with the buffer 33, using the actuator 39, via

  lever 36, and the required amount of free metal is

  in the receiver-pneumodistributor 2 (Figure 1),

from the mixer-oven 1.

  In the majority of cases, the quantity of metal admitted into the receiverpneumodistributor 2 corresponds to the weight of the half-product 26 to be cast, but it can also be

  bigger or smaller than this weight.

  After filling the metal receiver-pneumodispenser 2 to the prescribed level, the tap hole 31 is closed with the buffer 33, an overpressure is created in the chamber 30 and the receiver-pneumodistributor 2, using the circuit 4 (FIG. FIG. 1) for supplying gas under pressure, and the liquid metal is raised in the mold 6A

  through line 5, until its level (the meniscus

  that) reaches the underside of primer 9 The gas is

  found in the cavity of the mold 6 can escape

  freely through the central head 10 of the primer 9. The valve 12 (Figure 2) does not close the outlet port 83 in this case However, in some cases, it is advantageous

  to admit the metal into the mold 6 with an excess of

  on the meniscus of liquid metal rising To operate thus, it closes the valve 12 against the outlet port 83

  with a predetermined pressure and thus obtain the pres-

  gas required on the liquid metal meniscus

* As.

  The filling of the metal mold 6 is made

  as quickly as possible, for example in 3 to 5 s.

  When the filling of the mold 6 of liquid metal is completed, after closure of the outlet orifice 83 in the head 10, the initial formation of the skin of the semi-finished product 26 is carried out to the prescribed thickness, in conditions close to the conditions for forming hot shell moldings with overpressure on the side of the liquid metal To realize this condition, immediately after the filling of the mold 6 (FIG. 1) with liquid metal or before the beginning of the admission of the liquid metal in the mold 6, according to the possibilities of the mold 6, the cooling liquid is removed

  in its channels using circuit 8 for

  compressed gas (eg compressed air) and, in

  using the heat of solidification of the metal, warming

  the wall of mold 6 to the temperature

  necessary, for example, in the case of alloy casting of

luminium, up to 150-250 OC.

  During the admission of the compressed air into the channels of the mold 6, the admission is not interrupted

  coolant from the capacity 7 of

  supply of the cooling circuit of the mold 6, but the coolant returns directly to the supply capacity 7 via the valve 45 (FIG. 6)

by-pass.

  Said initial formation of the skin of the half-pro-

  in the heated mold 6 is carried out under a constant, pre-set excess pressure.

  be 0.5 to 0.6 bar, and even, sometimes, higher.

  The necessary overpressure is created by admission of a gas

  inert compressed from circuit 4 (Figure 1) of food

pressurized gas.

  The formation of the half-product 26 in the lingo

  Heated 6 is continued until the thickness of the skin reaches the prescribed value, for example 10 to 10 mm, and then the compressed gas in the

  mold channels 6 and the cooling liquid is admitted

  water, for example water, at a temperature close to room temperature The heat dissipation is

  intensified, both because of the lowering of the tempera-

  the walls of the ingot mold 6 that the ad-

  cold coolant mission in the lingo

  6 causes a noticeable decrease in its dimensions and

  the more intimate application of the walls on the semi-finished product 26.

  In such a system, it is possible to create conditions such that the skin in the process of solidification of the semi-finished product 26 undergoes the action of forces both from the outside, from the walls of the mold 6, and from the interior,

  liquid metal The fact that the dilation of the

  taste 6 when increasing the temperature of its

  walls and its withdrawal during the lowering of its temperature.

  must be taken into consideration is confirmed by the following example In the case of casting a semi-finished product

  diameter of 500 mm in a mold 6 in alloy

  anodised hard surface aluminum surface, since the

  coefficient of linear expansion of said alloy in the

  temperature range of 20 to 300 C is 24 10 6, the

  change of the inner diameter of the mold 6 provo-

  that by a change in the temperature of its walls of C amounts to 2.4 mm This is a noticeable change in the

  dimension of the mold 6, that it is necessary to take

  be considered and that it is advantageous to use.

  Further, while maintaining the overpressure on the skin being formed, on the side of the liquid metal, one

  continues its formation to a thickness of 40 to 60 mm.

  Once the skin of the semi-finished product 26 has formed

  at the prescribed thickness, the overpressure exerted

  liquid metal from the feed circuit 4

  in pressurized gas and, at the same time, the cooling liquid is expelled from the channels of the mold 6, thus ensuring a certain expansion of the mold 6,

  because of its reheating This creates better

  for the subsequent extraction of the semi-finished product 26.

  Then, by action using the mechanism 15 on the solidified skin of the semi-product 26, which is bound in a manner stre by its upper part to the primer 9, one

  extract it quickly (in 3 to 8 s) from the top of the

  6, of a length not exceeding the length of the mold 6, and after extraction, the arms 29 (Figure 4) are pivoted with the pads 28 about their axes and the pads 28 apply intimately against the semi-finished 26

  they surround all the outer surface.

  As soon as the extraction begins, a gas is admitted

  inert inside the semi-finished product 26, from the

  cooked 13 (Figure 1) supply of inert gas, through

  This can be achieved because, during the training

  the first section of the semi-finished product 26, the temperature in the central part of the end of the half-product 26 was kept higher than the casting temperature of the metal, by means of the heating element 11 (FIG.

in the central head 10.

  If the pressure prevailing in the pneumo-

  distributor 2 (FIG. 1) is set to a value close to atmospheric pressure, during the admission of the inert gas into the interior of the half-product 26 being produced, the

  liquid metal lying in the inner part of the half

  The product is rapidly removed and can be removed from the entire zone of the mold 6. In most cases, it is disadvantageous to lower the level of the metal below the lower edge of the mold 6. gas inside the current semi-product 26

  the meniscus of the liquid metal is first of all

  dropped, but not lower than the half-product 26 slice,

  then, creating the necessary overpressure in the receiver-

  pneumodistributeur 2, the meniscus is maintained at the chosen level, after which, as the semi-finished product 26 is extracted from the mold 6, the metal is raised

  at a speed not less than the extraction speed

  the semi-finished product 26 to the mold 6.

  At the end of the extraction of the half-product 26, it does not interrupt the rise of the liquid metal inside.

  of the half-product 26 under development: it is made

  ter to the extreme upper level, thus chasing through the central head 10 of primer 9 the inert gas is

found in the semi-finished product 26.

  In a series of cases, after extraction of half

  product 26 of the prescribed length, we give a small recoil

  half-product 26, in order to compensate for the longitudinal

  of the half-product section 26 forming again in

the mold 6.

  The formation of the skin of the next section of the semi-finished product 26 in the zone of the mold 6 is carried out

  as for its first stretch, that is to say with an over-

  pressure of the c 8 t of the liquid metal and with walls of the

  ingot mold 6 first heated and then cooled.

  heating the walls of the mold 6 started before the

  beginning of the extraction of the semi-finished product 26 is continued

  that the walls are brought to the temperature

  and after the end of the extraction of the half-product 26 to the mold 6, when his skin is still thin Then, at the end of the set time, the coolant is

  again admitted to the mold 6.

  From the development of the second section of the semi-finished product 26, during the pauses between the extractions, the metal is moved up and down without interruption within the half-product 26 being produced at a predetermined speed, for example at a speed of 0, 5 to 2.0 m / s The ascents and descents of the metal are accompanied

  evacuations and admissions of inert gas through

  towards the central head 10 of primer 9, the evacuation and the

  mission of gas that can be organized in such a way that

  no overpressure of necessary value prevails over the

nisque of the liquid metal.

  It should be noted that if it is necessary to ensure an uninterrupted movement of the liquid metal with respect to the

  skin in the course of solidification also during the preparation

  the first section of the semi-finished product 26, the inert gas is admitted before the moment when the first extraction of the semi-finished product 26 from the ingot mold 6 is begun, after which

  it becomes possible to fulfill the indicated condition.

  After the second extraction of the semi-finished product 26 from the mold 6, the second pair of pivoting sections in the secondary cooling zone 27 is activated and the entire process is repeated until

  all the half-product 26 is extracted at the desired height.

  Then we proceed to the formation of the skin of the

  semi-product 26 under the conditions corresponding to the completion

  the casting process of the semi-finished product 26 in its

  extraction from the mold 6 From this moment, the

  mid-product 26 is formed until its section is solid.

  ne, or until the thickness of its wall has the prescribed value, with uninterrupted climbs and descents

  liquid metal within the semi-finished product 26

  thus obtaining a quality structure in the sec-

  semi-finished product 26, and conditions are created for

  the chemical composition does not show any noticeable differences

  in relation to the average chemical composition in the

section of the semi-finished product 26.

  If the requirements for the quality of the semi-finished product 26 are moderate, the rise and fall of the liquid metal inside the half-product 26 are not mandatory during the period of its formation until

prescribed dimensions.

  If it is necessary to obtain a solid half-product 26 of quality, when its solidification comes to an end it interrupts the movement of the liquid metal inside,

  and the solidification of the semi-finished product 26 is completed

  holding an overpressure of the c 8 t of the metal conduit 5.

  The periodic extraction of the semi-finished product 26 to the mold 6 up to the prescribed length is carried out by

  through primer 9, using the mechanism of ex-

  traction of the semi-finished product At the end of the extraction of half

  26, the mechanism 15 is uncoupled from the primer 9 and, at the same time, the mechanism 16 for extracting the half-product is coupled to the primer 9. half-produced and placed in a position such that at the desired time the extraction mechanism of the half-product can be coupled quickly

  (in 10 to 15 s) at the following primer 9.

  The uncoupling of the extraction mechanism

  semifinished product with primer 9 and the coupling of the

  The fingers 17 then emerge from holes of the uprights 14 of the primer 9 while the fingers 19 (FIG. 3) of the fork 20 with the cutout 21 automatically engage in said stud holes

  14 of the primer 9, the fork 20 then engaging simultaneously

  with its cutout 21 in the notches of the element 54 (Figure 1), fixed to the bar 51 of the extraction mechanism 15

  In this way, the primer 9 is disengaged

  with the extraction mechanism of the semi-finished product and

  coupled to the mechanism 16 for extracting the semi-finished product.

  Using the mechanism 16 for extracting the half

  produces the extraction of the processed semi-finished product 26

  out of the mold 6 and transferred to the

  assigned cement according to the guides 25, using the trolley

24.

  So that, when extracting a half-product 26 full out of the mold 6, the lower end

  of the semi-product separates from the liquid metal in a manner

  re, there is admitted in this zone an inert gas, through the tube 40,

  from the circuit 4, through the tap 41.

  As soon as the elaborate semi-product 26 has cleared

  of the mold 6, a new mold 6 is placed on the mold

  the primer 9, which is coupled to the extraction mechanism 15

  of the semi-finished product. The receptor-pneumodistribu-

  2 the next portion of liquid metal from the

oven-mixer 1.

  The receiver-pneumodistributor 2 can also

  see a liquid metal booster during the preparation of the semi-finished product 26, when the gas pressure is set to zero

  in the receiver-pneumodistributor 2.

  If it is necessary to pour a hollow half-product 26, after extraction of the semi-finished product 26 of the prescribed length, the formation of its skin is continued until

  it reaches the required thickness all the way up.

  This is done, we drill and calibrate the channel;

  For this purpose, pins 65 and 66 (FIG.

  8) of the central head 10, disengaging them from the sockets 67 and 68 Then using the actuator 56 (FIG. 1)

  the bar 51 is lowered and, after coupling of the

  element 54 at the tail 57 (FIG. 8), the movement

  The optil 55 then slices part of the solidified metal.

  the inner surfaces of the semi-finished product 26 (piercing) and cali-

  the channel to the diameter of its active surface.

  The sliced metal is returned to the receiver

  pneumodistributor 2 (Figure 1) where it is remelted.

  The piercing of the canal is stopped at 20-30 mm

  the lower end of the semi-finished product, after which

  squeeze the central head 10 of with the bar 51, one makes

  go up the bar 51 and stop it so that the

  elements 54 are next to the cutout 21

  (Figure 3) of the fork 20 Then, we decouple the amor-

  9 with the mechanism 15 for extracting the half-product (Figure 1) and coupled to the mechanism 16 for extracting the semi-finished product. After executing the uncoupling-coupling of the mechanisms 15 and 16 for extracting the semi-finished product, using the actuator 56 the half-product 26 is extracted from the mold 6 and the tray 23 is lowered with its arm 18, to the low position o, using the pins 17, the arm 18 is coupled to the following primer 9 placed on

the mold 6 -

  The semi-product 26 extracted from the mold 26 is transferred 6 by the carriage 24 to the assigned location, then the drilling of the channel is completed, that is to say that the remaining 20 to 30 mm is drilled, and we release half-product

26 the center 4 10.

  As soon as the semi-finished product 26 has been removed from the casting axis, the following primer 9 is placed on the mold 6 and coupled to the mechanism for extracting the semi-finished product and, with the aid of the pins 65 and 66 (FIG. 8), the central head 10 is coupled to the inert gas supply circuit 13.

(figure 1).

  When all the operations listed above

  are completed, the casting of the semi-finished product

efore.

  The installation for the semi-continuous casting of metals according to the invention can cast semi-finished products having an external surface and a structure of improved quality, as well as a homogeneous chemical composition in

the section.

  In addition, it can sink semi-finished products

  hollow with calibrated inner surface of improved quality.

  Ultimately, we can achieve an economy,

  resulting from the reduction of charges for subsequent

  half-products and the reduction of scrap cast half-products, as well as

  of use of products made from half

  cast in the installation for semi-continuous casting

  bare of metals subject of the invention.

  The installation for the semi-continuous casting of metals which is the subject of the invention makes it possible, with a single

  line, to increase production by 3 to 6

  at the facilities currently used (depending on the size of the semi-finished product to be

  therefore, to manufacture a predetermined quantity

  products will require a smaller number of

  where the decline in investment and

operating costs.

Claims (3)

R E V E N D I C A T IO N S   1 Installation for semi-continuous casting   of metals comprising an oven-mixer (1), a receiver-   pneumodistributor (2) of metal connected to said furnace-mixer   geur (1) by a system (3) closed transmission of liquid metal and provided with a conduit (5) of metal, an ingot mold (6) with a cooling circuit, placed on said receiver-pneumodistributeur (2), and a primer (9) which is placed at the upper part of said mold (6) and mates with an extraction system of the semi-finished product at the   ingot mold, characterized in that, the cooling circuit   of the mold is equipped with a device (8) for forced displacement of the coolant out of the mold (6) with the aid of a compressed gas, the primer (9) comprises a central head (10). ) in which are placed   a heating element (11) and an adjustable valve (12) for   inert gas mission within the semi-finished product (26)   course of development, and the extraction system of the semi-pro-   the mold has two mechanisms (15, 16) for ex-   pulling the semi-finished product to the mold, coupled to the tower   8 to the primer (9), the mechanism (15) ensuring the extrac-   the semi-finished product (26) having a length at least equal to the difference between the length of the semi-finished product (26) and the   length of the mold (6), and the mechanism (16), ensuring   extraction of the semi-finished product (26) of a length   less than the length of the mold (6).   2 Installation according to claim 1,   characterized in that the mechanism (15) for extracting the half   product comprises a movable platen (23) with an arm (18), for coupling to the primer (9) and an actuator, and the mechanism (16) for extracting the semifinished product comprises a movable bar (51) with racks (52) and an element (54) for coupling to the primer (9) and an actuator (56).   3 Installation according to claim 1,   characterized in that it is equipped with a device for drilling and calibrating the channel in the semi-finished product,   realized in the form of a tool (55) for drilling and   liberation amounting to the lower part of the central   trale (10), and an actuator whose role is played by   the actuator (56) of the half extraction mechanism (16) produced in the mold.