US1758463A - Furnace for casting iron and other difficult fusible metals under pressure - Google Patents

Description

May 13, 1930. E. PETERssoN 1,758,463 FURNACE FOR CASTING IRON AND OTHER DIFFICULT FUSIBLE METALS UNDERA PRESSURE Filed Nov. 5, 1925 /n ren an Patented May 13, 1930 man3 ERNST PETERSSON, OF OREBRO, SWEDEN FURNACE Foa casTiNG :non ANDCTHER :DIFFICULT FUsIBLE METALSAUNDER PRESSURE v i i Application inea Novembertfieae, serial 116,146,449, and m s weeen January 9,1925.

This inventi n relates to furnaces forrcasting ironl and other difficult fusible metals under pressure, particularly when producing the pressure by vacuum, in which there is provided, between the molten metal in the v furnace or in a Crucible located in the furnaceJ and an opening made in the wall of the furnace, a Casting pipe consisting o-f fire-proof material and having a nozzle against which a mold is adapted to be pressed at the Casting instant. n

The object of the invention is, for one thing, to prevent cooling and solidifying of the molten metal, before it reaches the mold,

and for the other to effect a. vacuum-tight connection between the molten metal in the furnace or in the Crucible, respectively, and the mold.l

The invention consists essentially in this that the Casting nozzle is located within the furnace at a place, where it is exposed to the furnace heat, so as to prevent solidifying of the molten metal, the surface of the said nozzle, against which the mold is adapted to be pressed, having such a shape andthe Casting pipe carrying the nozzle being adjustably Connected to the zle is pressed against a correspondingly shaped surface of the mold, the said sur-V faces will automatically adjust themselves with relation to each other, so that anairtight connection will be obtained between the nozzle and themold. The said surfaces may v plane, and the Casting pipe may tion through a vice according to the invention. Fig. 2 is a partial sectional end view showing the suspensio-n device for the casting pipe.

In the drawing, l designates the melting i furnace which may be heated in electrical way or in any other known manner and in which there is placed a Crucible 2 for the metal. Ar-

lheight above therim of the Crucible is a ing the shape of a Y body of the furnace in such a manner that when the said surface of the nozannexed drawing one form of em' bodiment of an arrangement according to theV 1 invention is shown. Fig. 1 isa vertical sec-f* meltingfurnace having a de` rang-ed in the wall of `the furnaceat a suitable preferably circular vopening 3, the outereXtended part 4 of which is provided with a metal lining forming right before the openingY 3 a '5 sleeve 6 fitting closely to the opening 3.

`'-Pl-aced in the crucible 2l is an angularly bent lCasting pipe 7 co-nsisting of 4fire-proof material andextending about tothe bottom ofthe Crucible and at the upper freeend of 6e which there is rigidly secured a cup y"8, consist ing also,y of fire-proof material. Inserted in the bottom ofthesaid Cup Sisa nozzle 9 hav- Circular plate, the forefreey y side of which is plane-ground and'located so` 65 far within the furnace thatthe temperature at the opening of the nozzle liesiabove the temperature.v of solidiiication of 'the metal. The casting Vpipe 7 and the nozzle vk9jma`y beVK connected' to the cup'8 by means of fire-lute. 70 r-Jhe cup 3 is surrounded atits fore openfend i ar'ing 10` consisting preferablyof steel and is pivotally connected to" said ringA by Vmeans of 'twodiametricall'y opposite gudgeons 11 screwed into thering 10. rPhe ring l()Y is in 75 turn pivotally connected to the stationary sleeve 6 by means of two likewise diametrically opposite gudgeons 1Q screwed into the sleeve Gand lying in an `axial plane forming rightl angles .with the axial plane containing"80 the gudgeon, 11, so that there will beformed a Cardansuspension device for the Cup 8 with the nozzle 9 and the casting pipe 7 The nozzle 9 willconsequently, upon pressing the plane-ground foreend of the mold 13 againsti*"585 it, automatically Vadjust itself with its planeground end in an exact alignment with the plane endfoffthe mold, so that an air-tighty connectionV will be obtained between the moldu andthe nozzle.- i f Y f Y f 9 VThe opening 14 of thenozzle 9,7which communicates with the casting pipe 7 through' a' channel 15 in the bottom of the Cup 8, is, as apparent from Fig. 1, preferably conical and inclined, so that, when the mold 13 is removed 95 and the vacuum ceases,thef molten metal can easilyiiow back to the Crucible 2. Y c The .desired self-adjustment of the Casting pipe with the nozzle, resulting in a tightcon-` nection between the latter and the mold,'rnayf4 100 material,V iv

incits Wal1,a casting pipe against which the mold is adaptedto be having such a shape that,

. the mold the said r molten metall in the furnace evidently also be effected for instance by this that the casting pipe or the cup S connected thereto is made exteriorly spherical and applied in a spherical seat in the Wall of the furnace. 7 l Vfhat l claimisJ-fl. In a device for casting iron andi other diflicultly fusible metals byV forcing the molten metal into the mold by means vof a vacuum, the combination of a furnacevhaving an open-- inginits vvall, a ,casting pipe located between the molten metal in the furnace and saidlopent ing in the furnace wall and made of fire-proof a nozzle. .on the outer end of said pressed in the,casting,operation and a selfadjustingE suspension device carrying said pipei andthe nozzle, said nozzle, being loca-ted Withinwthe furnace at a place Wher'e'it is eX- posed to.` thefurnace heat, the-surface of the nozzle adapted to be pressed against the mold when press-ing it Within the furnace at a place Where it is eX- posed to the furnace heat, a surface of the nozzle adapted to be pressed against the mold having such a shape that, when pressing it against a correspondingly shaped surface of the mold, the said surfaces vvill,y due to said self-adjustingsuspensiondevice automatically adjust themselves With relation to each other, so as to perform an air-tight connection between the nozzle and the mold, the channel of the nozzle taking up an inclined position andI having` the outlet located at the top: 4. A device according to claim ,3, characterized by the channel of the nozzle being conical. In testimony whereof I afx my signature. ERNST PETERSSVN.

againstva correspondingly shaped surface of .i

surfaces will, due to said self-*adjusting suspension device, automatically adjnstthemselves with relation to each `otherns.olas to. perform an air-tight Connection between` the nozzle and the mold;

'2. In afidevice for casting iron andother diiicultly vfusible metals by forcing the molten metalintothe mold by'means ofa vacuum, the

pipe located betvveen'the Said Opening inyithe furnace Wall Vand madeof fire-proof materiahf anozzle on the outerl end .of said pipe-.against Whichthe mold` is adapted to be pressed at tliecasting operation, and a self- .adjlisting suspension t device carrying said pipe. and 4the nozzle, said nozzle being located `Within thefurnace at aplace vvhere it is eX- posed to thefurnace heatya surface of the fnozlzleadapted to be pressediagainst the mold having such a` rshapethat, when rpressing it the mold, j the AVsaid surfaces wil against ya correspondingly shaped surface of l, due to said `self.adjusting suspension device, automati- ,callyfadjustthemselves vvithrelation to each other, A.so `as to perforrnqan` lair-tigight connection between.y the nozzle and the mold, said y casting pipebeing providedatvits,freeend pipe against with a cup-shaped part, the nozzle being located at the bottoni of said cup-shaped part.`

3. `-In a devicefor casting Iiron and other diliicultly fusible metals by foi-zcingthernolten 1 combination ofa-r furnace .having an opening metal into the mold by vaelium the @Ombnationof a furnace `havingan opening in .its Wall,` p l i 1A molten metal in the furnace andk saidopening v6oY a casting pipeA located between thek inthe furnace Wall andinade of fire-,proof material, a nozzle onk the outer end of said Whichtheinoldfis adapted to be pressed latlthecasting operation, and., a selft adgustinglyjsuspension device carrying'said ripe an@ the 1192.21.91, .said nozzle-being located

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