SE458017B

SE458017B - Chill or other container for horizontal extrusion casting

Info

Publication number: SE458017B
Application number: SE8602487A
Authority: SE
Inventors: J E Eriksson
Original assignee: Asea Ab
Priority date: 1986-06-02
Filing date: 1986-06-02
Publication date: 1989-02-20
Also published as: SE8602487D0; SE8602487L

Abstract

This device prevents solidification of material for casting by inductively heating the feed pipe. The molten material is led from an oven or container through the pipe. The pipe is enclosed by one or more heating elements, which prevent solidification of the material. Break rings prevent the metal from setting in the pipe. The heater element may be driven at 50-200 Hz, or may also have a second frequency of 10-60 Hz which causes an inductive mixing and therefore improved warning. Alternatively, the heater may be a two- or three-phase device.

Description

458 017 I fig 1 visas en tundish l med tappningsrör 2 till en kokill 3 för kontinuerlig, horisontell gjutning. Det gjutna ämnet synes vid Ä. 458 017 Fig. 1 shows a tundish 1 with tapping pipe 2 to a mold 3 for continuous, horizontal casting. The cast substance is visible at Ä.

I fig 2 visas tappningsröret 2, lämpligen keramiskt, med omgivande värm- ningsspole 5. eventuellt även omrörarspole. 7 är en s k breakring, avsedd att förbättra strukturen och förhindra fastsvetsning av metallen vid kokillen, utförd i bor och/eller kiselnitrid.Fig. 2 shows the tapping pipe 2, suitably ceramic, with surrounding heating coil 5. possibly also agitator coil. 7 is a so-called break ring, intended to improve the structure and prevent welding of the metal to the mold, made of boron and / or silicon nitride.

Värmningsspolen matas med en frekvens av 50~2OO Hz, och inducerar därvid tillräcklig effekt för att smälta en propp av stelnat material, bildad mellan tundish 1 och kokill 3, och som synes är spolen 5 placerad i eller vid röret 2 mellan kokill 3 och tundish 1.The heating coil is fed at a frequency of 50 ~ 200 Hz, thereby inducing sufficient power to melt a plug of solidified material, formed between tundish 1 and mold 3, and apparently the coil 5 is placed in or near the tube 2 between mold 3 and tundish 1.

Alternativt kan spolen matas med normal omrörarfrekvens (10-60 Hz) och nyss nämnd värmarfrekvens, varvid värmningsförloppet påskyndas genom den induktiva omröringen, vilken kan ske i en gemensam spole eller i separata spolar, en- eller flerfasiga, och omröringen kan även ske flerfasigt i bägge fallen. Omröringsrörelserna visas vid 6 i fig 2.Alternatively, the coil can be fed with a normal stirrer frequency (10-60 Hz) and just mentioned heating frequency, whereby the heating process is accelerated by the inductive stirring, which can take place in a common coil or in separate coils, single or multiphase, and the stirring can also take place in multi-phase both cases. The stirring motions are shown at 6 in Fig. 2.

En annan utformning av värmnings-/omrörarspolen 8 visas i fig 3. Här är spolen (eller spelarna) utformad som dubbelfrekvensvärmare, och omröringen är så ordnad, att ett axiellt magnetiskt vandringsfält bildas och omröring helt eller delvis i axiell led erhålles.Another design of the heating / stirring coil 8 is shown in Fig. 3. Here the coil (or players) is designed as a dual frequency heater, and the stirring is arranged so that an axial magnetic migration field is formed and stirring is obtained in whole or in part in the axial direction.

Spolen kan utformas såsom ett antal delspolar, kopplade enligt fig Q. I den övre delen av fig U är delspolarna tvåfasmatade S1-S3, S2 -S4 i och för omröring. och i den nedre delen av fig 4 enfaskopplade för induktiv om- röring. Beträffande frekvenserna, se ovan, där omröringsfrekvensen är 10-60 Hz. och värmningsfrekvensen 50-200 Hz. I omröringsfallet kan även trefaskoppling tänkas, och omrörings- och värmningsströmmar.kan flyta i samma spollindningar, exempelvis enligt SE 99 713. eller i skilda lind- ningar. Även enfasomröring kan ske.The coil can be designed as a number of sub-coils, connected according to Fig. Q. In the upper part of Fig. U, the sub-coils are two-phase fed S1-S3, S2-S4 for stirring. and in the lower part of Fig. 4 single-phase coupled for inductive stirring. Regarding the frequencies, see above, where the stirring frequency is 10-60 Hz. and the heating frequency 50-200 Hz. In the case of agitation, three-phase connection is also conceivable, and agitation and heating currents can flow in the same coil windings, for example according to SE 99 713. or in different windings. Single-phase agitation can also take place.

Vid horisontell stränggjutning vill man röra om nära breakringen (se 7 i fig 2). Vid denna ring finns ett litet utrymme för omröraren och dessutom en skärmande kopparplåt i de vanliga konstruktionerna. Man kan förlänga tundishen med ett rör av keramiskt material eller en kombination av kera-In the case of horizontal continuous casting, it is desired to stir close to the break ring (see 7 in Fig. 2). At this ring there is a small space for the stirrer and also a shielding copper plate in the usual constructions. You can extend the tundish with a tube of ceramic material or a combination of ceramic

Claims

3 458 017 mixed and non-magnetic material (see 2 in Fig. 2 or 9 in Fig. 3) and place a stirrer around this tube as shown at 8 in Fig. 3. The stirrer can either be placed directly against the tube with little play or, if there is a lack of space, placed with significant air gap and iron poles. The device as above can be varied in many ways within the scope of the following claims. PATENT REQUIREMENTS

Sideboard, tundish, oven or other metallurgical container (1) for horizontal continuous casting, provided with a tubular outlet part (2, 9), around which at least one inductive heater coil (5, 8) is arranged, characterized - drawn from the fact that the coil is arranged to be fed partly two- or three-phase in order to stir, and partly single-phase in order to heat.

Sideboard according to claim 1, characterized in that the stirrer frequency is arranged to be 10-60 Hz, and the heater frequency 50-200 Hz.

Sideboard according to Claim 1 or 2, characterized in that the heater is designed as a so-called double-frequency heater, among other things so that an axial magnetic migration field is formed and agitation in the axial direction is obtained.