DK141838B - Apparatus for continuous or semi-continuous metal casting with a hollow, annular, water-cooled inductor, an annular electromagnetic shield and an annular cooling device. - Google Patents
Apparatus for continuous or semi-continuous metal casting with a hollow, annular, water-cooled inductor, an annular electromagnetic shield and an annular cooling device. Download PDFInfo
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- DK141838B DK141838B DK555277A DK555277A DK141838B DK 141838 B DK141838 B DK 141838B DK 555277 A DK555277 A DK 555277A DK 555277 A DK555277 A DK 555277A DK 141838 B DK141838 B DK 141838B
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Description
141838141838
Opfindelsen angår et apparat til kontinuerlig eller halvkontinuerlig støbning af jern- og ikke-jernmetaller og disses legeringer omfettendeen hul, ringformet, vandkølet induktor med tilsluttede strømtilførsels-5 skinner, en ringformet elektromagnetisk skærm i induk-torens indgangsåbning og en ringformet køleindretning på induktorens yderside.The invention relates to an apparatus for continuous or semi-continuous casting of iron and non-ferrous metals and their alloys comprising a hollow, annular, water-cooled inductor with connected current supply rails, an annular electromagnetic shield in the inlet opening of the inductor and an annular cooling device's inductor device.
Fra beskrivelsen til britisk patent nr. 1.157.977 kendes et apparat til kontinuerlig eller halvkontinuer-10 lig støbning af metal, hvilket apparat omfatter en ringformet induktor, der ved hjælp af sit elektromagnetiske felt påvirker det smeltede metal og former dette til en støbeblok, en elektromagnetisk skærm, der tilvejebringer en nødvendig aksial fordeling af magnetfeltet samt en 15 ringformet køleindretning til jævn tilførsel af et kølemiddel på overfladen af den under formning værende støbeblok. Induktoren består af en enkelt vinding af et kobberrør med rektangulært tværsnit. En kølevæske tilføres det indre af induktoren. Til induktoren er der 20 sluttet strømforsyningsskinner, der er isoleret fra hinanden ved hjælp af et dielektrisk mellemlæg.From the specification of British Patent No. 1,157,977 an apparatus for continuous or semi-continuous casting of metal is known, which apparatus comprises an annular inductor which, by means of its electromagnetic field, influences the molten metal and forms it into a casting block, a an electromagnetic screen providing a necessary axial distribution of the magnetic field and an annular cooling device for smooth application of a refrigerant to the surface of the molding block being formed. The inductor consists of a single winding of a copper tube of rectangular cross section. A coolant is supplied to the interior of the inductor. To the inductor are connected 20 power supply rails which are insulated from each other by means of a dielectric shim.
Når en sådan induktor er i funktion, forekommer der imidlertid en svækkelse af det magnetiske felt på det sted, hvor strømforsyningsskinnerne er sluttet til 25 induktoren. Denne effekt medfører en deformation af støbeblokken, hvis cirkulære form forstyrres, og der kan på støbeblokkens overflade dannes op til 4 mm brede blærer.However, when such an inductor is in operation, a weakening of the magnetic field occurs at the location where the power supply rails are connected to the inductor. This effect causes a deformation of the molding block whose circular shape is disturbed and up to 4 mm wide blisters can be formed on the surface of the molding block.
Opfindelsen har til formål at tilvejebringe et 30 apparat til kontinuerlig eller halvkontinuerlig støbning af metal, hvilket apparat er udformet på en sådan måde, at støbeblokkes overfladekvalitet forbedres, og tværsnitsf ormei bliver næsten nøjagtigt cirkulær.The invention has for its object to provide an apparatus for continuous or semi-continuous casting of metal, which apparatus is designed in such a way that the surface quality of the casting blocks is improved and the cross-sectional shape becomes almost exactly circular.
Dette formål opnås ved hjælp af et apparat af 35 den indledningsvis angivne art ved, at et afsnit på den bort fra den under støbning værende blok vendende side af induktoren på begge sider af tilslutningen til strømforsyningsskinnerne har form af indskud af metal 2 141838 med 40-60 gange større specifik elektrisk modstand end induktoren, f.eks. rustfrit stål, at hvert af disse afsnit er kasseformede med en længde, der er mindst tre gange induktorens tykkelse, og at dets langsgående 5 vægge begge ligger an med kanten mod en mod den under støbning værende blok vendende massiv sidevæg af induktoren .This object is achieved by means of an apparatus of the kind set out in the preamble, in that a section on the side of the inductive block of the inductor on both sides of the connection to the power supply rails takes the form of insertion of metal with 40-40 mm. 60 times greater specific electrical resistance than the inductor, e.g. stainless steel, that each of these sections is box-shaped with a length at least three times the thickness of the inductor, and that its longitudinal walls both abut the edge against a solid sidewall facing the molded block.
Anvendelsen af indskud med den angivne høje specifikke elektriske modstand får den elektriske strøm til 10 at gå fra strømforsyningsskinnerne til den sidevæg af induktoren, der vender mod den under støbning værende blok, således at der praktisk taget ikke passerer strøm igennem indskudene. Strømmen bliver således koncentreret på det sted, hvor strømforsyningsskinnerne er slut-15 tet til, og skaber et jævnt elektromagnetisk felt, som påvirker det smeltede metal langs hele dettes omkreds. Deraf følger, at der ikke opstår nogen svækkelse af det magnetiske fel på det sted, hvor strømforsyningsskinnerne er sluttet til, hvorfor der ikke sker 20 nogen forstyrrelse af støbeblokkens cirkulære form. De fundne forhold imellem indskudenes dimensioner og deres form forbedrer kvaliteten af støbeblokke ved at eliminere overfladedefekter og forstyrrelser af det cirkulære tværsnit.The use of inserts with the specified high specific electrical resistance causes the electrical current to extend from the power supply rails to the sidewall of the inductor facing the casting block so that power does not pass through the deposits. Thus, the current is concentrated at the point where the power supply rails are connected, creating a smooth electromagnetic field which affects the molten metal along its entire circumference. It follows that there is no weakening of the magnetic field at the place where the power supply rails are connected, so that there is no disturbance of the circular shape of the molding block. The found relationships between the dimensions of the inserts and their shape improve the quality of molding blocks by eliminating surface defects and disturbances of the circular cross section.
25 Disse og andre træk ved opfindelsen forklares nær mere nedenfor på grundlag af en udførelsesform af appa-ratet, idet der under beskrivelsen henvises til tegningen , hvor fig. 1 viser et lodret snit gennem et apparat 30 ifølge"opfindelsen, fig. 2 et vandret billede af en induktor, og fig. 3 et snit langs linien III-III i fig. 2.These and other features of the invention are explained in more detail below on the basis of one embodiment of the apparatus, with reference being made to the drawing, in which: FIG. Figure 1 shows a vertical section through an apparatus 30 according to the invention, Figure 2 is a horizontal view of an inductor, and Figure 3 is a section along line III-III of Figure 2.
Et apparat til kontinuerlig eller halvkontinuerlig støbning af metal har en ringformet køleindret-35 ning 3 med hulrum 4 og 5, som.gennemstrømmes af et væskeformet kølemiddel (vand), hvilket aggregat er monteret på et underlag 1, jfr. fig. 1, ved hjælp af stilleskruer 2. Hvert af de nævnte hulrum har gennem- 141838 3 gående kanaler 6, gennem hvilke kølemiddel kan strømme ud på overfladen af en under støbning værende støbeblok 7. Ved bunden modtager en rund åbning 8 af den ringformede køleindretning 3 en bundplade, som ikke er 5 vist på tegningen. På den ringformede køleindretning 3's indervæg er der fastgjort en ringformet induktor 9, jfr. fig. 2, som består af et kobberrør med et rektangulært tværsnit. Til induktoren 9 er der sluttet strømforsyningsskinner 10, som er adskilt indbyrdes 10 ved hjælp af et mellemlæg 11 af et elektrisk isolerende materiale. Induktoren er bestemt til at tilvejebringe et elektromagnetisk felt, der holder det smeltede metal i form af en søjle, som størkner til en støbeblok.An apparatus for continuous or semi-continuous casting of metal has an annular cooling device 3 with cavities 4 and 5 which is flowed through a liquid coolant (water), which assembly is mounted on a substrate 1, cf. FIG. 1, by means of adjusting screws 2. Each of said cavities has through passages 6 through which coolant can flow out onto the surface of a casting block 7. At the bottom, a round opening 8 of the annular cooling device 3 receives a bottom plate not shown in the drawing. An annular inductor 9 is mounted on the inner wall of the annular cooling device 3, cf. FIG. 2, which consists of a copper tube with a rectangular cross section. To the inductor 9 are connected power supply rails 10, which are separated from each other 10 by means of an intermediate sheath 11 of an electrically insulating material. The inductor is intended to provide an electromagnetic field which holds the molten metal in the form of a column which solidifies into a molding block.
På begge sider af tilslutningen til strømforsy-15 ningsskinnerne 10 er afsnit af induktoren 9 forsynet med indskud 12 af rustfrit stål, der har en forholdsvis stor specifik elektrisk modstand. Indskuddet 12 kan være fremstillet af andre materialer end rustfrit stål, når blot den specifikke elektriske modstand 20 som nævnt er 40 - 60 gange den specifikke modstand af det kobber, den ringformede induktor 9 er fremstillet af. Indskuddene 12 har en længde 1, som er mere end tre gange induktoren 9's tykkelse a.On both sides of the connection to the power supply rails 10, sections of the inductor 9 are provided with stainless steel inserts 12 having a relatively large specific electrical resistance. The insert 12 may be made of materials other than stainless steel when only the specific electrical resistance 20, as mentioned, is 40-60 times the specific resistance of the copper of which the annular inductor 9 is made. The inserts 12 have a length 1 which is more than three times the thickness a of the inductor 9.
Indskuddene 12 er kasseformede, jfr. fig. 3, 25 og kanten af deres langsgående vægge er sluttet til en massiv sidevæg 13 af induktoren 9, som vender mod den under støbning værende blok 7, medens deres ender er sluttet til de respektive ender af de andre vægge af induktoren 9, jfr. fig. 2, og sammen med disse danner 30 et ringformet hulrum 14 for kølemidlet, hvilket hulrum kommunikerer med hulrum 15 i strømforsyningsskinnerne 10.The deposits 12 are box-shaped, cf. FIG. 3, 25 and the edge of their longitudinal walls are connected to a solid sidewall 13 of the inductor 9 facing the casting block 7, while their ends are connected to the respective ends of the other walls of the inductor 9, cf. FIG. 2, and together with these 30 form an annular cavity 14 for the refrigerant, which cavity communicates with cavity 15 in the power supply rails 10.
En elektromagnetisk skærm 16 er anbragt i den øverste del af den ringformede induktor 9's runde åb-35 ning. Indskuddene 12 kan være arrangeret enten på ydersiden af induktoren 9’s sidevæg, (når induktoren omslutter støbeblokken) eller på indersiden af induktoren 9, når der skal støbes en hul blok, men i alle tilfælde 141838 4 er den væg af induktoren 9f der vender imod støbeblokken, massiv og af det samme materiale som induktoren, dvs. et materiale med en ringe specifik modstand, hvorimod indskuddene 12 som nævnt er fremstillet af 5 et materiale med en høj specifik modstand. Denne forudsætning gælder også ved samtidig støbning af flere støbeblokke i et hold serieforbundne apparater ifølge opfindelsen.An electromagnetic shield 16 is located in the upper portion of the circular aperture of the annular inductor 9. The inserts 12 may be arranged either on the outside of the side wall of the inductor 9 (when the inductor encloses the molding block) or on the inside of the inductor 9 when molding a hollow block, but in all cases the wall of the inductor 9f faces the molding block , solid and of the same material as the inductor, viz. a material with a low specific resistance, whereas the inserts 12, as mentioned, are made of 5 a material with a high specific resistance. This premise also applies to the simultaneous casting of multiple casting blocks in a team of series-connected apparatus according to the invention.
Apparatet ifølge opfindelsen fungerer på følgende 10 måde.The apparatus of the invention operates in the following manner.
I den ringformede induktor 9's runde åbning 8 indføres der en bundplade. Igennem strømforsyningsskinneme 10 påtrykkes der tværs over induktoren 9 en spænding, og et kølemiddel cirkuleres igennem induk-15 toren 9's hulrum 14 og strømforsyningsskinnerne 10's hulrum 15. På bundpladen hældes der smeltet metal, der af det magnetiske felt, der er induceret ved hjælp af den ringformede induktor 9, formes til en søjle, der dernæst størkner under dannelse af en ydre skorpe.In the round opening 8 of the annular inductor 9, a base plate is inserted. Through the power supply rails 10, a voltage is applied across the inductor 9 and a refrigerant is circulated through the cavity 14 of the inductor 9 and the cavity 15. The power supply rails 10 are poured on the base plate of molten metal which is induced by the magnetic field induced by it. annular inductor 9 is formed into a column which then solidifies to form an outer crust.
20 Fra den ringformede køleindretnings hulrum 4 og 5 sprøjtes der igennem kanalerne 6 vand på støbeblokken 7's størknede sideflade med henblik på at fremskynde dens størkning. Efterhånden som støbeblokken 7 størkner, sænkes bundpladen, medens der samtidig oven-25 fra kontinuerligt hældes smeltet metal, indtil der er opnået en støbeblok med de krævede dimensioner.20 From the annular cooling device cavities 4 and 5, water is sprayed through the channels 6 on the solidified side surface of the molding block 7 to accelerate its solidification. As the casting block 7 solidifies, the base plate is lowered while simultaneously pouring molten metal continuously from above until a casting block of the required dimensions is obtained.
Elektrisk strøm fra strømforsyningsskinnen 10 strømmer til den ringformede induktor 9's indre langsgående væg 13 uden at spredes der, hvor strømforsy-30 ningsskinnerne 10 er sluttet til, fordi indsatsene 12 som nævnt har en 40-60 gange større specifik elektrisk modstand end det kobberrør, som udgør den ringformede induktor 9. Dette giver en mere jævn fordeling af magnetfeltet langs omkredsen af den induktorvæg 13, 35 der vender imod den under støbning værende støbeblok 7, som følge af at strømmen ikke er spredt. I det betragtede eksempel anbringes det smeltede metal inde i den ringformede induktor 9's runde åbning 8, medensElectric current from the power supply rail 10 flows to the inner longitudinal wall 13 of the annular inductor 9 without dissipating there, where the power supply rails 10 are connected because the inserts 12 have a 40-60 times greater specific electrical resistance than the copper pipe which constitutes the annular inductor 9. This provides a more even distribution of the magnetic field along the circumference of the inductor wall 13, 35 facing the casting block 7 during casting, as the current is not dispersed. In the considered example, the molten metal is placed inside the circular aperture 8 of the annular inductor 9, while
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK555277A DK141838B (en) | 1977-12-13 | 1977-12-13 | Apparatus for continuous or semi-continuous metal casting with a hollow, annular, water-cooled inductor, an annular electromagnetic shield and an annular cooling device. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK555277A DK141838B (en) | 1977-12-13 | 1977-12-13 | Apparatus for continuous or semi-continuous metal casting with a hollow, annular, water-cooled inductor, an annular electromagnetic shield and an annular cooling device. |
DK555277 | 1977-12-13 |
Publications (3)
Publication Number | Publication Date |
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DK555277A DK555277A (en) | 1979-06-14 |
DK141838B true DK141838B (en) | 1980-06-30 |
DK141838C DK141838C (en) | 1980-12-15 |
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Application Number | Title | Priority Date | Filing Date |
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DK555277A DK141838B (en) | 1977-12-13 | 1977-12-13 | Apparatus for continuous or semi-continuous metal casting with a hollow, annular, water-cooled inductor, an annular electromagnetic shield and an annular cooling device. |
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DK (1) | DK141838B (en) |
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1977
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DK141838C (en) | 1980-12-15 |
DK555277A (en) | 1979-06-14 |
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