DE1957953C - Approach head for the continuous casting of refractory metals - Google Patents

Description

The invention enters a starting head for that

Gfeßgeiß dependent mold engages. Under pouring ^ - ^^^^^^ ', ogrande. each vessel is a barrel in this context _w to comparable ^ _a ^ S _U N7E _iner gießgefäßabhängigen food marriages, the "off over a mouthpiece to a mold J" ^ 2ff5. | _b he can avoid the disadvantages of being resolved, for example ^ e ^ em ^ O en ₅₅ ^^^ Jj ^ Si ,, «, but also a so-called intermediate vessel, which knew about the written ^^ ηκ ^ f ^ head of the one pouring ladle is charged with liquid MetaU. This task_is with an f

One of the great difficulties with the _{Stranggiegangs ■ named genus ^^ f Elü {} f ^ _öff

There was a sudden increase in this confused air; DeUüftungsjohr auh <e, »t

VSSSSSSSS · B ^ fe

n a gas-tight on the approach head is provided that the liquid medium

_{prevents penetration} into the gap between the approach and ^ ₁₁₁₀₁

Α «ta block the mold. Preferably formed by a filter package St, steel mesh or steel wool. But chicanes can also be provided that consist of kech and are arranged in such a way that “you; Prevent v-> m GassUom mitgenssenen part of liquid metal from escaping together with escaping gases. Ventilation tube.isi zxvecklich detachably connected ear head. The inlet opening Sffi is preferably from the pouring mouth S so that the ventilation _{pipe does not come out of the mouth}

opening 6 m
melts the

contains wool,
those on the lower Jm
ien end of the approach head mn
Connection is _rrfhniMBas liquid medium

Flows at the beginning of the casting process

tall, ^ B steel, ^a ^. ^d ^ SSl0 a and expan-J ^ S3S »» thaltene air _{ώ expansion} without aenhoblraurn dadasEntlüftungsgM in the AtmolokUlenhohlraum _metal ^ _{111 and} this ^^ ηηΐ, combustion gases 6 id

i. essential
by taking place,
tube 24 and the
Sphareentweic
10 gradually with

at the ^Ko ^ S
Air as well as any .

e combustion _{valve opening} 26 into the

- - ^A - -

e become metal droplets torn against the escape of liquid metal collected within the ventilation pipe »5

^ge ; .., "the inlet opening of the vent pipe is arranged at the level which is reached by the flushing Me-3 ^ when the coke cavity 'ic:,; is completely filled, then the expansionary V> can almost completely escape dScnden gases; Fan £ in the strand can thus ^ «^^ But there is also a risk of explosion in the cavity
26 reached so

_a liquid metal. _It is fluid _{in the relatively} narrow ^

run

TSunii clogs the end of the FuUvorgan-Leslo automatically; the gas that is still present in the sum can _no longer be significantly reduced because the gas pressure is practically the static aa _cntspnch t.

-ssr

lead

of the start-up head according to the invention

ΐΑ ^^ ^ it starting

pfest of a vertical mold,.

i g. 2 a second exemplary embodiment in the emer ontalen, reciprocating mold, _g . 3 to 5 three variants of ventilation pipes ^ SfJSS ^ ζ £? hSontale

KokJfe 36 efn dt over a mouthpiece 38 with a KoWIe 36 em ^^ _ht . _The start-up

SiUt in turn one with its end 42 detachable besjUt every ^ ^ Ä

S further embodiment of an A * - ^^^^ T ^ Äfes in a horizontally arranged, hm and

_he , ewegHchen ^: _d ^^ S ^ Ä ^

vertically arranged mouthpiece 4 attaches ₅ o 44 «" 8 ^ "of _{the A} ^B _nfahrstra nges am

wmss

see the approach head 44 and the inner wall of the mold. Since the inlet opening 56 of the ventilation pipe 50 is at a level which corresponds approximately to the complete filling of the mold cavity 46 with liquid metal, the expanding air displaced by the filling process can flow out practically until the end of the filling process. If the level of the liquid metal has reached the inlet opening 56, the ventilation pipe 50 is clogged by the inflowing, liquid metal, which cools down relatively quickly, before the liquid metal has reached the ventilation channels 58 and 60 . If desired, a filter insert corresponding to the filter insert 28 in the exemplary embodiment according to FIG. 1 are provided.

Since the ventilation pipe 50 also serves as a starting bolt, the starting head can be unscrewed a removed from the vent pipe 50 cast in the beginning of the strand and after renewal of the sealing washer 48 and can be reused after inserting a new vent pipe 50.

Instead of the in FIGS. 1 and 2 shown ventilation pipes can also those according to F i g. 3 to 5 can be used. The in Fig. Vent tube 62 shown has two 3 with respect to its longitudinal axis at an angle disposed inlet nozzles 64 and 66 with inlet openings 68 and 70, which lie in a plane parallel to the tube axis. In the case of a direction of the ventilation pipe 62 parallel to the mold axis, the inlet openings 68 and 70 therefore face the mold inner wall

In the case of the ventilation pipe 72 according to FIG. 1 , its free end 74 is closed; the ventilation pipe is connected to the mold cavity via a plurality of bores 76 provided in its circumferential surface.

The in Fig. 5 shown ventilation pipe 78, which is particularly for use in a vertical mold is suitable, has two inlet stubs 80, the inlet openings 82 in one to the pipe axis cherish vertical plane. The free end 84 of the vent pipe 78 is blocked to prevent the entry of the To prevent pouring stream into the pipe interior.

The in F i g. The approach head 90 shown in FIG. 6, possibly rigidly connected to the approach line, is particularly suitable for use in a horizontal mold 36 according to FIG. 2, which is displaceable on a pouring mouthpiece 38 or is rigidly connected to the pouring vessel. At its end facing the mold cavity, the approach head has a cylindrical recess 92 which merges via a cone 94 into a vent opening 96 of reduced cross section. The ventilation opening 96 is in communication with the atmosphere outside the mold via a bore 98. A filter package 100 is connected upstream of the starting head 90,

ίο which is partially embedded in the cylindrical recess 92, while the part lying outside the starting head is surrounded by a sleeve 102. The filter package 100 is in its in the cylindri-. See recess 92 lying part penetrated by a diametrically extending tube 104 through which a bolt 106 secured in the approach head extends. The tube 104 is encompassed by a V-shaped steel armature 108 , the legs of which are bent at liö and protrude into the mold cavity 46.

If, during casting, liquid metal flows through the mouthpiece 38 into the mold cavity 46, the expanding air contained in the mold cavity escapes through the filter pack 100, the mold.

»5 nus94, the channel 96 and the bore 98 from the mold. With increasing filling of the mold cavity 46, liquid metal also flows into the filter pack 100 , but settles in the spaces between the filter pack, which is made of steel, for example

wool can be formed, solid, so that these spaces grow closed and prevent the further passage of liquid metal. On the other hand, the cuff 102 prevents the liquid metal from penetrating into the gap between the approach head 90 and

the mold. By using the sleeve 102 , an exact adaptation of the approach head to the clear cross section of the mold can be avoided.

The in Fig. 6 illustrated exemplary embodiment

has the advantage that the mold cavity 46 can be vented practically without increasing the internal pressure above the static pressure of the liquid metal, since a large-area connection via the filter pack 100 to the venting channel 96 in each

The filling stage of the Kokulenhohlraüines is guaranteed. The approach head 90 can be pulled off the filter pack 100 for reuse after the bolt 106 has been removed

1 sheet of drawings

Claims (8)

1 S57 953 patent claims: β «.. * f.S ^ S Äokillenhohlraum defecant quickly from ^ KoKUeilhohlraum bininra- 1. Start-up head for the continuous casting of high- ^^^ start-up strand blocks the KoIdI-melting metals, especially steel, the 5 gende ^Κο Ρ ^ι . ° ^. ^ 2 _Rege i except for emen relabv rtcÄn a ventable, pouring vessel-dependent ^ St & ^ £ Ά gap so wide that air mold engages could, characterized by narrow GWT _{flow out,} then a by the dummy bar (18; 90; 44), "jJ ^ m ^ Jk entrained through _the gap, which m the extending ventilation opening (30; 58 60; 92 S ^ ^ E "an immediate clamping of the 94,96,98) with a lock (24; 50; 62; 72; 78 io g ™ _{stens would lead to the Kokme} . Is the or 28; 100) against the Leakage of liquid Agert, with one at the pouring vessel MetaU and one at least at a vertical KoM> moving ^ g ^ b _d ^ _{± e K} ^ The mold Enüüftungsöffnung upstream ^^^ Λ _cov ies the danger that LIQUID Vent pipe (24; 50; 62; 72; 78). Also in the gap between the mouthpiece and 2. Start-up head according to claim 1, characterized & - 15 SenwSd ekidringt while the mold indicates that the lock veiSmt by em Fdterpa- ^ J ^ ck ket (28; 100) made of steel wire, steel mesh or ^^^ horizontal mold steel wool depending on the vessel. i ^ Snnt / deuS Auslegeschrift 1136 796J ₁ m de- 3. An approach head according to claim 1 or 2, da- W ™ jj ™ gaö with a vertical, characterized in that the venting tube ao rm JdjEm ^ venting hole (24; 50-62; 72; 78) releasable with the approach head jf <ta ^ ¹ «^ points at its lower end (18; 44; 90) is connected. ^ "R! Wind up and is with a Gewmdemur.cr 4. Starting head according to one of claims 1 em thread aut una _{m the} inside to 3, characterized in that the entry ^ve 7 ^ch ^ H ^ _nwa ^ _{d sit} zt. d £ upper end of the Emöfinung (26; 56 68,70; 76; 82?) of the vent * - »5 side ^{d 'r K} ^^ ° Be _h older enclosed in the tube (24; 50; 62; 72; 78) from the pouring mouthpiece "-" ^^ SSTeSute "interior the Entluf · (4; 38) is turned away ... Γη JShrun ^ ündet the upper opening of the container 5. approach head according to one of claims 1 processing bore m.on ^d ^ _kbar ^ container edge to 4, characterized in that the Entlüf- * «« ™ <™ Z * üSrück, through which a, service pipe (50; 62; 78) as Anfahrbolzen trained 30 ^^ "KrEntluftungsbohrung angeordn ■" ^{dt it} S ^ k di Gindespindel drüo pipe (50; 62; 78) arranged as a g ^^ ventilation hole ^{det is} · _JA -κι newindSp ^ ndel extends; the threaded spindle drüo .; 6. Start-up head according to one of the claims: 1 ^ g ¹ ^ _which lies on the meta-chips, ·., to 5, characterized in that the Entluf- ^ ^η . ^ Χ ' _{επιηιεη of} the metal chips with eim processing tube (24) contains the lock (28) ^ SL tl ie the Entlüftungsbo to 5, characterized in that the Entluf ^. ^ Χ _{επιηιεη} the metal chips with eim processing pipe (24) contains the lock (28) A ^ tSL of the stilt through the vent hole 7. Start-up head according to euiem of claims 1 35 escaping ^ ocr to 6, characterized in that the filtering ^v ; ^rh ^ ert "t. . ^ ^. ^ package (100) formed lock on the front side ^The * ^e J * Jt ^ _e rd £ nut and the threaded 5 Afhkpfes (90) arranged and detachable A " ^s fl ¹ « ^ ^ hliß d ö package (100) molded lock on the front face ^D JJt ^ _e rd £ nut and the threaded 5es approach head (90) arranged and detachable A " ^s fl ¹ « ^, ^ _n , wear and malfunction (by bolt 106) with this is connected the end of the sowing ^ suzen _{all emein} , - 8. Start-up head according to claim 7, characterized in that 40 initial ak 1Kokü en mn ^ ^. ^ ^^ indicates that at the beginning of the 2 ^ _h 'Ä ^ S ₅ g _ie ß process of the solidified head (90) a the filter package (100) umsch- that ^^ _e ^S * £ g £ expanded and through a ßende sealing sleeve (102) arranged, st. ^ rtaU ver ^ pfte wnsa ^ J ^ ^^ _{am Qhnehm} ♦ 5 required work on the approach head, on which at least the one included in the frozen strand Start-up bolts must be renewed, also aut, agile work carried out on the mold itself