US1008478A - Process of casting steam-turbine wheels, &c. - Google Patents

Description

'w. T. HOPSON & o. B. REARIGK. PROCESS 0F CASTING STEAM TUBBINE WHEELSrh APPLIOATIOI FILED IAB. 11, 1911.

'Panentel Nov.1'4, 1911.

wlmfssfs 'd TTORNE VS UNITED STATES PATENT o union.

WILLIAM T. HOPSON, 0F NEW LONDON, CONNECTICUT, AND CHARL ES BEMIS REARIK, 0F NEW YORK, N. Y.

V:PROCESS 0F CASTING SEAM-TURBINE WHEELS, icc.

specification bf Letters Patent.

Patent ed Nov. 14, 1.911.

Application filed March 11, 1911. Serial No. 613,904.

fl'o ali whom tt may concern:

Be it known that we, WILLIAM T. HOPSON, of New London, Connecticut, and CHARLES BEMIs REARICK, .of New Yorkcity, New York, citizens of the United States, have made certain new and useful Inventions Re, lating to Processes of Casting Steam-Tun bine VWheels, &c., of'which the following is a specification, taken in connection with the accompanying drawing, which forms part of the same.

This invention relates to processes of casting steam turbine wheels having thin bucket vanes or other objects having thin partitions, lugsor teeth which consist in pouring the metal into aV suitable distributing basin which communicates through sprues in the mold With a heavy flow ring adjacent said partitions 'or with a relatively heavier portion 4of the casting itself adjacent the partitions and in flowlng the molten metal thus supplied through `such thin partitions and connected runners communicating with the iiow ring so as to prevent chilling'the metal entering the partitions,l and` thereby secure strong sound partitions of unusual thinness. `In the Vaccompanying drawings showing in. a somewhat diagrammatic manner an illustrative Inode of carrying `out this inven tion, Figure 1 is a Vvertical central section through the mold and casting. Fig. 2 is a partialA horizontal section thereof; an'd Fig. 3 is a partial vertical section taken outside the casting. 4

According to the illustrative manner-of i carrying out this invention shown in the y drawing, the'sectionsofthe iiask 1 conta1n ing the ,upper and lower sections 3, et of the green sand or baked sand lmold may be mounted on the usual Inold board 2. The

t casting Which may be any vobject having thin partitions on its peripheryfor instance, such l for example, as thin lugs, teeth, or bucket vanes, such as 17, in thefcase of the steam turbine. Wheel illustrated, may have a rela'v tivelythiclrer rim 18 substantially inclosing or shrouding thesepartitions and c on-A i necting them Withv vthe web'G Whichmay extend inward to connect with the enlarged -hub 15. As is specially desirable in steam turbinewheels these partitions may by the present method be cast of the extreme .thinness ofone-,tenth of an inch or less in s ome cases 'and stlll secure strongsound castings when bronze orother suitable metal is used.v l

The mold ,may be for] Jed in the usual Way and the wheel bucket: or recesses 1G on either side of the parti ,ion 17, fornistance be formed by the use of sectional or integral cores 5 arranged in the r lold as indicated. .i heavy o r relatively larg e sectioned flow ring or gate 1s provided locai ed at any convenient point adjaceiigitgbepart tions so that during the casting cess the: `e may be a relative- HOW off'metal through the partitions and runners connecting the] 1 with the flow ring so that the molten inet al passing in either direction between the ieavy gate and the parts of the casting ad acentcthe partitions prevents chilling of me `al entering the partitions and insures tin strongr and sound characterof these thin partitions. For example, the heavy gate may be in the forni of the flow ring 9 exten ling around the turbine wheel adjacent thi partitions and `for convenience formed in t ontact with any side of the ring of'cores 5, for instance on top of these cores, as illustl ited in the drawing. A series of tapering ru mers 7 maybe used to connect this 'flow rin g to each of the nartitions, as indicated in Figs. 1 and 3 of the drawing anda series o sPrlTs 11 serves to connect this 'heavy gat( with a distributing basin 10 .which 'may be i1 the form of a circular-ring around the top the mold in case a turbine wheel is being n ast'. It is also desirable to have another cistributingabasin 13 which may be in simil: r circular form connected by a series of sp `ues/12 with the, part of the casting adjacent )tte partitions,-'such, for example', as the rel. v1 and also Vif desired e orY 4more separate sprues 21 may supp In etal to the other portions of the ca sti suci as' the hub 15 from one or more basins la i l the top of the cast;

ing. 4

In pouring theniold the molten 1 etal is supplied to4 either one or bothof he dis-v tributing basins, so tl at forV instance the metal entersgandfills trie flow ring or gate 9 4and passing through the series of runnersy 7 flows rapidly througi the thin partitions 17 to supply the adjaci nttpartsof the casting and in thus `fiowin gfthrough the partii vely heavy rim 18 vpendently supplie to t' le casting as through y the basins 13 or 14 in wi tic-h/t/hganoltefmnetal 8 would in any vevent rise during the cast ing-loperation.

avingdescribed this invention inconnection with illustrative methods, devices and arrangements of steps, to the details ofv which disclosure the invention is not of course limited, what is claimed 'as new and What is desired to be secured by Letters Patent'is set forth in the appended claims.

1. The process of casting 1n sand molds steam turbine Wheels or the'like having thin cored peripheralpartitions which consists in pourin the metal into a continuous distributing asin communicating with apheavy flow ring above andadjacent said partitions,`

.in supplying the'molten metal from said flow ring throughrunners to each of said 'thinpartitions adjacent the middle portion of its edge to allowthe metal to flow through said partitions during the casting operation to prevent chilling 'the metal entering said partitions and to'supply the ad'acent portions of the-casting and 1n indepen ently supplying additionalmetal to the casting.

2. The proces of casting in sand-molds steam turbine vwheels or the like having thin peripheral partitions which consists in pour ing the inet-al -into -a circular distributing basin communicating through sprues with a heavy flow ring adjacent said partitions, in supplying the molten metal from said flow ring through runners to each of said thin partitions to allow the metal to How through said partitions during the casting operation to prevent chilling the metal entering said partitionsand to supply the adjacent portionsof the cast-ing and `in independently supplying additional metal tothe casting.

3. The process of casting in sand molds steam turbine Wheels or the like having thin cored peripheral partitions, which consists in pouring the metal into a circular distributing basin communicating-through sprues with a heavy iioW ring adjacent said partitions, in supplying the molten metal `from said oW ring through runners to each of said thin partitions adjacent themiddle portion of its edge to allowthe metalto flow tlirouglisaid'p'artitions during the casting operationto prevent chilling the metal entering said partitions and to supply the adjacent portions of the casting and in independently supply-v ing metal to the casting.

4. rIhe process of casting steam turbine Wheels or -the' like having'thin peripheral Apartitions which consists in pouring the metal into a continuous, distributing basin communicating with a flow ring adjacent Gopies of this patent may be obtained for .wheels or the like havin partitions which consists Ainforming a flow 4,

80 throughrunners to each ofsaid artitions ve cents each, by Washington, D. C.

municating through runners with each of said thinj partitions and in flowing the molten metal through said runners and' parti tions during the casting operation to pre# vent chilling the'metal entering said partitions.' j

6. The process ofcasting steamturbine thin peripheral ring adjacent said partit-ionsfand connected and in flowing the molten meta through said partitions and runners during the casting operation to prevent chillin'gthe met-al entering ,said partitions.

7. The process of making in sand molds castings having thin partitions whichcon sists 4in forming 'a flow gate adjacentA vsaid partitions and connected through runners with a plurality-of; said partitionsand in. io'wing` the molten metal through said runners and partitions during the-.castingpoperation to prevent chilling the metal entering said partitions. vi

8. The process of making in sand molds castings having thin edge partitions which.

consists in forming a heavy flow gate adjacent said partitions and connected through runners with said partitions and in flowing the metal through said runners and partitions during the casting operation toprevent chilling the metal entering'said `par' 9. The process of'making in sand molds castings having'thin edge partitions which consists in forming above and adjacent said partitions a heavy flow gate connected through runners with a plurality of -said partitions and in owingthemolt'en metal throughsaid runners and partitions during the casting operation to prevent chilling theinetal entering said partitions.-

'WILIJIAM- T. HOPSON.

CHAS. BEMIS REAR-IGK.

Witnesses: I

HARRY L. DUNCAN, i Jnssin B. KAY.l

addressing the Commissioner of Patents,

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