US1583248A - Process for bottom casting - Google Patents

Description

May 4 ,1926.

P. H. G. DURVILLE PROCESS FOR BOTTOM CASTING Filed March 14. 1922 8e feeding orifice of PatentedMayk 4, 1926.

UNITED STATES PATENT orr ca.

PIEBRE HENRI GASTON DURVILIZE, OF PARIS, FRANCE.

PROCESS FOR BOTTOM CASTING.

Application filed March 14, 1922. Serial. No. 543,731.

To all "who mrit may] concern: i

Be it k n that I, PIERRE HENRI GASTON DURVILLE, citizen of the Republic of France,

Rue 'dAmsterdam,' Paris,

residing at 65 5 Seine, France, have mvented certain new and useful Improvements in or Relating to a Proc ssfor Bottom Casting, of which'theof sand mouldsis .efi'fected while causing during the operation the least possible agitation of the molten metal.

' This condition is not at all events attained by a direct pouring into the molds, where considerable agitation of the metal flowing 0 into the metal already cast inevitably occurs and causes a very large amount of oxide,

flows, slag, dross and pellicular-folds a considerable portionof which elements remain.

imprisoned in the castineven after a portion has risen in the dea headsreserved for the purpose. This condition, moreover, is

not attained in current operations as hitherto practised in bottom casting by providing a a lateral duct to the mould or by reservin an analogous conduit in the sand of the san mould;

- a v In fact, if the section of the metal inlet orifice at the bottom of the mould is reduced in comparison with that oi the charging or manner to maintain the latter full immediately after the commencement of the pouring, the hydrostatic pressurecorresponding to the height oi the conduit causes a gushing 40 at the bottom of -a jet of wateras like a fountain which oocasions a'prejudi'cial agitation and disturbance of the li uid.

But if, on he contra at the base ofthe mould 1s greater than that 3f the charging orifice'of the lateral conl uit,

level during the whole fieriod of the casting and the height of the fa of the molten metal into the condu't, a'height at the commencement equal to that of the mould, necessarily induces a. prejudicial agitation. 4 7 Within the limits of this dilemma, not been possible to find-an ap 58 dle course, although the or inary bottom casting device never gives results sufiiciently it has GGSS ized by maintaining the lateral conduit in aheight that it the mould. much more like .i

, the inlet section "portionally with the operation of filling the assembling, during the several elements consti-' elements which are- I mould, by; successively the latter cannot be keptto the full tuting the conduit,

ropriate midj satisfactory to compensate the complication which it involves, Also, in spite of the wellknown advantages appertaining to top casting of objectsof large dimensions,the actua insufficiency of the casting processes always limits the adoption of this means.

Various processes of filling by rotating and tipping have occur in the two current modes of casting by maintaining during the continuance of the operation to a tranquil-filling of the moulds, avoiding. disturbances and the consequent defects, but owing to the tipping these lattergiethods, by at least necessitating the hanng of large masses, are particularly convenlent only for thproduction of small and medium sized units.

'" The present invention has for its object i and its particularcharacteristic to provide anabsolutely tranquil bottom casting process without tipping, that is to say the ingot or other mould may remain stationary, and to attain simultaneouslythe two physical conditions which are incompatible with the ordinary bottom casting methods namely f obtaining throughout the casting operation] 'a sluggish flow ofthe'liquid current both from the point where the feeding or charging conduit joins as well as to the point where the feeding duct receives the poured metal, which is realthe level of the molten metal poured into is constantly and substantially the same inv the interior of the mould and in the feedin duct, although at each instant the height of the fall between the vessehor the molten metal is poured ladle from which and the surface of the metal already poured into the duct may be much reduced.

- The arrangement employed has also a particular characteristic feature,- feeding conduit, or conduits, is formed prothat operation,

placed one above another as the'level ofythe poured-in metal rises imthe mould. The

height of the equal to that tipping is thus at the most of one of the e stituting a conduit.

In the accompanyi g drawings: V

been employed with sue-. for remedying the inconveniences that the mould at' such a and that is the i the lower part of the mould lements con- Figs. 1 to ,3'are vertical sections of an T example of the device for carrying mto a effect the process according to the invention,

I showing three different saccessive states of the casting operation.

, Fig. 4 shows, in vertical section, a device;

Fig. 5 is a'verticaI sectionof one of theelements that constitutethe lateral conduit st-ituting the vertical or conduits for to the mold. r

Fig. 6 shows, in vertical-section, another example 9f the device for carrying into efl'ect the process according tothe Invention,-

supplying the molten metal such a devicehaving two lateral supply .con'

dmts. I

' Figs. 7 and 8 represent two =1iiodified i take" place simultaneously or 1n turn by forms of the device with two lateral con-' duits.

y In Figs. l'to 3, is a. mould, is 'theorifice where the feeding or char ing conduit opens into the mould; 3 is the horizontal portion of this conduit, 4 is part which serves for the initial tipping, 5 is one part of the feeding conduit, the element being moment when the level of the poured-in and iig. 3

height of the free fall metal approaches the upper portion of the part 4; other analogous elements subsequently added in the same manner are shown at 6, 7. and 8. In the pile thus formed the filling terminates, that is at the level 10.

j Each element is set in ceding element has been filled, so that the maximum, equal to the represents the final phase of the operation,

after which the final filling of the mould can the several elements 'form the feeding condu t as expansion of .a refractory substance or with sand be-completed without inconvenience by di-.

rect pouring in at the top 11. Fig. 4 shows, also by way of example, a

similar arrangement for filling a sand mould.

It is evident without departing from the characteristics of the successively added to the metal in the mould occurs may be entirely or partly of metal, and be lined with may have any form and more removable parts, may be socketed or be simply placed one upon another, be free or be fixed and or by means of any appropriatedevice.

jto'the same level of the elements con added at the the last added element of' place after the pre of the metal is, at a height of an element. an intermediate phasev present invention that ,be' arranged in position by hand conduits such as 12 in .Ifig. 4' may be'interposed as auxiliary elements between the 'or-,

dmaryelements, toj permit of filling very high account the condition of the metal already a cast'at the bottom. A mould can be group of elements, ments constituting fed by means of a single or several groups of'eleseveral feeding conduits or be united to form bne as in Figs. 7 and 8.

e elements of the several conduits may Th be put an place simultaneously or in turn,

or. to different levels (Fig. The tipping into the several conduits/may means of a single vessel or several vessels. single supply conduit or several conduits may be common to several moulds, Y The ascending course be employed known ingot or other mould-casting processes.

The invention is independent of the appa-' ratus which serves as the molten metal receptacle during the pouring, which receptacle may be a ladle witheeveral spouts or lips or a ladle with several cral ladles used.

What I claim is:

1..An apparatusfor molding metals or of any suitable. form may be stoppers, or scvmoulds without having to takeinto casting device may of incombination with any B0 alloys comprising a vertical mold and a substantlaly vertical conduit communicating being formed of a plurality of separable sections, whereby said-conduit is adapted to be built up step by step, for the purpose described. g Q

2. An apparatus for "molding metals or alloys, comprising a mold imd a conduit communicating with the bottom thereof and a plurality of-conduitsections adapted to be placed in communication with said conduit one above the other, for the purpose described.

3. The process of castingmetals or allo'ys by introducing the molten material into the' mold through a conduit communicating with the bottom thereof, which comprises pouring section appropriate tl to the desired end, may consist of one or PIERRE HENRI GASTON DURVILLE.

afiix my signature.

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