US1771114A - Ladle - Google Patents

Description

July 22, 1930.

A. FRY

LADLE Fil-ed ay .3,

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The object of the invention is a heatable ladle intended to cast metals and ymetal alloys, more particularly steels and steel alloys. The invention therefore primarily consists in the fact that the ladle is equipped with means for heating it by alternating current of high frequency.

In order that the invention can be more easily understood, a preferred embodiment of the samel is illustrated by way of example in the accompanying drawin 1n which Figure 1 is a view of a la le intended to cast steel and steel alloys, and p Figure 2 is a section on line l2-2 of Fig-v ure 1.

Referring to these fi ures, the ladle 1s composed of an inner bo y A and ashell surrounding itand composed of annular sections A1 and a bottom piece A. The inner body A is made of an electrically non-conductive material, e. concrete. A spirall wound electric coil is embedded in the 1nner body A at the ends of which coil can be connected to an electric main of alternating current of high frequency, e. g. 8000 cycles. The coil B consists e. g. of a copper ipe which can be cooled by a water current owing through it. The annular sections A1 and the bottom piece A2 of the shell advanta ously are made of a non-magnetic steel al oy, e. g. of austenite chromium-nickel steel 'and separated from one another by electrically insulating intermediate pieces a. The annular sections are further provided with holes or depressions a* the obect of which isLto reduce the I'generation of e dy currents in the sections A1.

In the bottom of the inner body A is provided a tap hole a that passes alsothrough the bottom piecelA and can be closed by a plu (not shown). l,

Vhen to be used the described ladle is filled from the furnace with the steel alloy to be cast. Thereupon the coil B is connected to the valternating current main and a cooling' water current sent through it. Under the action of the electric current passing through the coil B an induction current is enerated' in the steel alloywhich ypowerfuy heats the latter. This heating ofthe plu is withdrawn as usual, whereupon the scribed ladle consists in the fact that the 860,262, and 1n Germany my 1s, 192s.-

alloy enables to quiet it in the ladle and to obtain thereby a very satisfying separation of the slag constituents therein which rise to the surface. In case of need the usual additions, such as deoxidizin means can be added to the alloy while in t e ladle.l The formation of edd1es occurring owing to the Ainduction heating then produces a quick and uniform distribution of these materials with in the steel bath. In tapping'the ladle, the

sleel alloy flows out of the ladle into the c 1 The chief advantage offered by the deforeign bodies contained in the steel alloy d easily have the opportunity, as indicated above, to separate from the steel alloy bath that remains thinly liquid due to its being heated. The steel cast 'in this manner is therefore remarkable over known steels for a (uite particularly high urity of foreign bo ies. The described lad e further enables to perform the heating of the steel alloy also in vacuo and to further increase thereby the purit of the steel. Y

I c aim 4 1. A ladle composed of an inner bodyfof refractory material carrying a coil adapted to be fed by alternating current of high frequency, and of a shell made of a non-magnetic iron alloy and composed of annularA sections electrically insulated from one another, and of a bottom piece.

2. A ladle composed of an inner body of refractory material carrying a coil adapted to be fed by alternating current of high fre# quency, and of a shellmade of a chromiumnickel-iron alloy and )composed of annular sections electrically insulated from one anmother, and of a bottom piece.

3. A ladle composed of an inner body of refractory material carrying a coil adapted to be fed by alternating current of high frequency, and ofV a metal shell composed of annular sections electrically insulated from one another, and of a bottom piece, said sections having holes passing through them from outside. l y

4. A ladle comprising an inner body, a coil 10e in mid body, said coil being adapted u', be

fed by alternating current, a shell com of annular sections, electrically insu ated from one another, each of said sections ooms prising a plurality of arcuate strips electrically insulated rom one another, and of a bottom ieee.

The oregoing specification signed at Cologne Germany this 19 da of A Y 'DOLLP ril, 1929.

FRY.

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