LU80064A1 - IMPROVEMENTS IN PROCESSES AND DEVICES FOR CONTINUOUS CASTING OF METALS - Google Patents

Description

c 1891 2.4076 ot

O Q Q 0J · AND-DUCHY OF LUXEMBOURG

Patent N ° ............_______________________________ of ................. I.?.Z®L Minister,. , 1¾¾¾ of the National Economy and the Middle Classes

Book title: ........................................

Industrial Property Service

W LDXE1 “BODRO

'J / ff, $ 0 patent application request - —— ^ ^ ^ I. Request ... The ... CENTER ..... DE ..... RESEARCHES ..... METALLURGIQUES-CENTRUM V00R RESEARCH ....... (1) IN DE METALLURGIE ....... association ..... sans ..... but lucrative-vereniging zonder winstoograerk, 47, rue Montoyer, 1040 Bruxelles, Belgique, (2) .rep..ré.s.en.të ..... par ..... M ...... München., ...... acting in quality ..... of agent, deposit ........ this first August 1900 ..... seventy-eight ......................... .................... (3) to ...] ... 5. · ... Ρ..Ρ ........ hours , at the Ministry of National Economy and the Middle Classes, in Luxembourg: 1. this request for obtaining a patent for an invention concerning: '* · ............. .................................................. .................................................. .................................................. .................................................. .................................................. .......— (4) ..... !! .. P.er.f.ec.tionn.en] .sn.ts .. ..to ...... processes ...... and ..... to casting devices __________ .... cQntin..ue ...., lethal .... ", .................................................. .................................................. ..........................................______________________________________ declares, assuming responsibility for this declaration, that the inventor (s) is (are): ... J. *. essie.ur.s ...... Pierre ...... QA.lj.B_Y _, ... ... 4, ....... rue ...... des. Faculties,. 4..2..00 ..... Ougrée, _________________ &)

Bel.gigue., Jacoues pEFAYS, 35, rue de 11 Ermitage, 4121 NeuviΠe-en-Condroz, BelgiqueetAlainPALMAERS, 74, boulevardHector Denis .... 4.0.0. () Liege, Bel.gigue ....... .................................................. ..............................., .................. .................................................. ..........................___ 2. the delegation of power, dated ........ JLÎ.ê.S. ê ...................................... on ..... dM1 ... 1.1..Ç.J: ......

3. description in language ________ ί..Γ ..?. Ί! .. 5.? .. 1 ...? .. ® .................... ................ of the invention in two copies; 4 ............. 1 ................... drawing boards, in two copies; 5. the receipt of the taxes paid to the Luxembourg Registration Office on ..... ler ... aMt ... I9.Z8 ................. .................................................. .................................................. .................................................. ............................................

claims for the above patent application the priority of one (s) request (s) of (6) ........................... ./·/· ........................................ ..... ............... filed in (7) ................... / .. / .... .................................................. .................................................. ..

the ................................././............. .................................................. .................................................. .................................................. .................................................. ................. (8) .............................. ................. // ............................... .................................................. .................................................. .................................................. ...........................................

in the name of ...... ______________________ He ........................................ .................................................. .................................................. ................. --------------------------------- ------------------ O) elect domicile for him (her) and, if designated, for his agent, in Luxembourg ________________________________ lia, boulevard Prince-Henri (10) requests the issuance of a patent for the invention described and represented in the appendices _a ^^^^ nt of this grant to ....... 4ί ^ .Ι.!? ^ ..? .. ί. ......month.

Π. Deposit Minutes

The above application for a patent for invention has been filed with the Ministry of National Economy and the Middle Classes, Industrial Property Service in Luxembourg, dated: August 1, 1978

Pr. The Minister at .. J.S ..... Q.Q ..... hours heures. e'e of the National Economy and the Middle Classes, .............. ^ p · d · ff A / V ^ ^ f \ ifs'1 ri> <K £ l— v] v '1 iy fj_ | _ (H Name. Company name, address - ÎS1 s'.vCa place webffsentÊ' Bar aeissant in duality of agent - m date of C 1891/7807. ti 4 METALLURGICAL RESEARCH CENTER - CENTRUM V00R RESEARCH IN DE METALLURGIE,

Non-profit association - i Vereniging zonder winstoogmerk in BRUXELLES, (Belgium).

Improvements to continuous metal casting processes and devices.

The present invention relates to improvements in the continuous casting methods for metals. It also relates to a device for the implementation of this method.

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In the description which follows, reference is made to the continuous casting of steel. It goes without saying that this reference is only of exemplary value and that the invention applies equally to the detection of the level of the metal in any receptor. / 1 / 2.-, »»

In the case of continuous casting of steel, it is known that the liquid metal contained in pockets coming from - the steelworks is first poured into a distribution basket from which * it * flows in one or more open ingot molds.

"

The ingot in the course of solidification is continuously extracted from the ingot mold, with a certain speed which is in direct relation to the speed of supply of this ingot mold in liquid metal flowing from the distributor basket.

; In turn, the feed metal flow rate de- i | i hangs from the ferrostatic pressure at the flow orifice, that is | that is to say, in fact the level of liquid metal in the distribution basket, under the combined influence of the flow of metal to the ingot mold and of the feed from the steel ladle.

! During the continuous casting operation, it is: of the greatest interest that the level of the liquid metal in the distributor basket does not fall below a minimum value so much so as to obtain a regular casting rate and to ensure the settling of inclusions, thanks to a sufficient residence time of the metal in the distribution basket.

; At the end of casting, it is also very important to know, as precisely as possible, the variation! of this level, in order to be able to determine the best time to stop the casting, before the slag begins to be entrained while retaining in the basket only a minimum quantity of unused metal.

It therefore appears that variations in this level. 'can exert a significant influence on the smooth running of one continuous casting operation.

The object of the present invention is to propose a method for detecting the level of liquid metal in a continuous / continuous distribution basket, which allows these conditions to be taken into account. / Jf / \ 3.- * \ 1 The mistletoe process is the subject of the present invention / in which the metal is poured from a pocket into an intermediate container from which the said metal is poured into a casting mold continuous, is essentially characterized in that there is in the said intermediate container an element present! as much a density lower than that of the said liquid metal, in that équipe the said element is equipped with means making it possible to identify its posi-; j tion, in that, thanks to these means, we detect the position of said! element and in that we deduce the level reached by said j; 1 tmetal in said intermediate container.

! > j; A first embodiment of the process of the invention consists in using an element whose density is between i that of the liquid metal and that of the slag which floats, the I said element therefore floating therefore on the metal / slag separation surface, and to provide it with an adequate position detection system.

According to the invention, it is advantageous to house; in the float element a source of radiation, for example; radioactive, which can be targeted and located by a system known per se.

i

Still according to the invention, this float can be i provided with an index which moves in front of a series of fixed marks, for example integral with the intermediate container, and thus indicates the position of the level of the liquid metal in said inter-j container. media.

It is also in accordance with the invention to assign to these tracking systems, extreme, upper and lower conditions which, when they are reached, cause either a reduction (upper condition) or an increase (lower condition) of the intermediate container in year 5 *! liquid metal.

i, i According to a particularly advantageous variant i! / of the process of the invention, an element cons- / is immersed in the metal; made of a material whose density is lower than that of the m-y ~ / /: // tal, we measure the buoyancy applied to this element u ^ r // 4.- / "* · * ' liquid metal and the level reached by the liquid metal i is deduced therefrom in the intermediate container.

! * j '* This element preferably has a density equal to. that of the slag, so as not to undergo an Archimedes push from the latter.

j j As a preferred embodiment of the process of 1 j invention, there is in the intermediate container a rod of the kind of a stopper rod, dipping into the metal li-! quide, we connect the said bar to a suitable sensor which provides. a signal representative of the Archimedes thrust undergone by the said bar and the said signal is used to modulate the metal feed rate and to ensure the control of the continuous casting operation.

It is particularly advantageous to use this signal to vary the metal feed rate and a continuous casting parameter, in particular the ingot extraction speed, in order to minimize variations in the level of the metal in the basket.

The process of the invention will be better understood in 1 with reference to the appended drawing, which represents, in a dry manner! matic, and not limiting, an example of implementation.

In this drawing, there is shown at 1 a basket for distributing continuous casting, provided with a refractory lining 1 ′ and a cover 1 ″. The metal bath 2 covered with a layer of slag 3 flows through the nozzle 2 ', in the open ingot mold 12. In the metal, immerses a stopper 4, supported by an arm * 5 which is connected to a support 8 via a force measurement cell 6. Under l action of Archimedes' push on • the stopper 4, the cell 6 provides the indicator 7 with an electrical signal representative of the level reached by the metal in the basket 1. The signal picked up at 7 is introduced into a module as-, servissement 14, which allows on the one hand, to control the speed / extraction of the ingot via the regulator 13, ej / 7 ^

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Claims (9)

1. Process for the continuous casting of metals, in particular steel, in which the liquid metal is poured from a ladle into an intermediate container from which the metal is poured into a continuous casting mold, characterized in that l 'there is disposed in said intermediate container an element made of a material whose density is lower than that of said liquid metal I, in that the said element is equipped with means making it possible to identify its position, in that, thanks to these means, the position of said element is detected and in that the level reached by said liquid metal in the said intermediate container is deduced therefrom. ‘ 2. Method according to claim 1, characterized in that the position of said element is continuously identified and in that the level reached by the liquid metal in the intermediate container is continuously deduced therefrom. 3. Method according to either of claims 1 and 2, characterized in that said element is made up of a float whose density is between that of the liquid metal L and that of the slag supernatant liquid metal. 4. Method according to either of claims 1 to 3, characterized in that the means for locating, the position of the float are constituted by a substance emitting / both radiation, for example a radioactive substance lo inside the float. See v /. ~ 6.- *! ” 5. Method according to either of claims 1 to 3, characterized in that the means for locating • the position of the float are constituted by an index moving in front of a series of fixed marks. 6. Method according to either of claims 1 to 5, characterized in that one assigns to said locating element extreme conditions which, when reached, cause an adequate variation of the feed rate - * state of and / or emptying of the metal in the intermediate container. * 7. Method according to either of Claims 1 and 2, characterized in that a bar of the type of a stopper rod which is at least partially immersed in said liquid metal is used as the locating element. , in that the Archimedes thrust applied to this element by the liquid metal is measured and in that, by appropriate means, the level reached by the liquid metal in the intermediate container is deduced therefrom. 8. Method according to either of claims 1,2 and 7, characterized in that a bar is used whose density is equal to or substantially equal to that of the slag. 9. Method according to one or other of Claims 1, 2, 7 and 8, characterized in that the said rod is connected to an appropriate sensor which provides a signal representing the pushing force. Archimedes undergone by the said bar and in that the said signal is used to modulate the rate of supply of the metal in the intermediate container and / or to ensure the control of the continuous casting operation. Drawings: _______ d— plates ______C_pages including .................... cover page .......... 9L. description pages .. ......... p-jo ^ s of claims .................... short description Luxembouj ^ -He ûA-Le agent ?:. / Jr ,.