US1500428A - Centrifugal casting - Google Patents

Description

July 8 1924. 1,500,428

w. w. WElTLlNG CENTRIFUGAL CASTING Filed March 31, 1922 T5. g. l

Fig- 3 .Ezug- 4L- Flg 5 IN VEN TOR Patented July 8, 1924.

UNITED STATES v 1.500. 28 PATENT OFFICE.

WILLIAM w. WEITLING, or COLLEGE 201m, IDNG ISLAND, NEW YORK.

CENTRIFUGAL CASTING.

Application filed March 31, 1922. Serial No. 548,894.

To all whom it may concern.

Be it known that I, WILLIAM W. WEIT- LING, a citizen of the United States, and a resident of College Point, Long Island, in the county of Queensv and State of New York, have invented certain new and useful Improvements in Centrifugal Castings,

to de Lavaud, thereby to minimize mould I breakage due to too long an interval between the contact of hot metal against one end of the mould and the contact of hot metal against the other end of the mould; while at the same time permitting, for the carrying out of such process, the provision of a rotary casting machine also accordingto the present invention, say for the making of elongated tubular articles such as pipe, in which no relative longitudinal movement occurs between mould and distributor during the transfer of the molten 'metal from distributor to mould; and while, further, avoiding any necessity for providing a distributor of the type in which is included, in addition to a trough part extended into the mould, a reservoir attached to said trough. At this point, in passing, the statement should be made that the present invention, as to the material to be formed into an article by rotary action, is notintended to be limited to the use of molten metal; although in places in the above language reference is made, for the purpose of convenience of description, to metal or molten metal; in this respect, as in other respects, the appended claims of course, indicating the scope of the invention. 7

The present process involves introducing such char e in toto into a chamber bounded by the inside walls of the mould while there confining the charge in an elongated mass completely spaced from the mould but substantially co-extensive with the length of the mould, and then breaking up such mass by transferring the molten metal from the confines of the mass and against the inside surfaces of the mould in a rapidly sweeping flow beginning near one endof the mould and thence running along the length of the mould and terminating near the other end of the mould. Preferably, said flow of metal is set up as a sheet-of a width equal at least to the inside diameter of the mould, the molten metal being thus transferred from said 'mass to the mold while the sheet isfurther controlled, after an initial spill from the mass, so that at least approximately-eighty per cent (80%) of the molten metal .is transferred from the mass to the .mould as the result of a rapid sweeping of .such sheet, along the major portion of the length of the mass from a pointnear one end of the mould to a point near the other end of the mould. I

The above process is preferably carried out by providing a distributor which is merely a tilting trough, of. the type well known in the art except, that in addition to having within it an elongated compartment for holding, without spill in a certain position of the distributor, the entire pre-determined charge of .material for making the desired article, the distributor has a wall in continuation of a longitudinal wall of said compartment, said first mentioned wall having an edge extending from a point near one end of the distributor to a point near the other end of the distributor and over which edge the material in the distributor is to be discharged into the mould when the distributor is angularl moved about its said center line, .sai substantially a, straight line and gradually edge being preferably diverging more and more away from the center line of the distributor from a point near one end of the distributor to a point near the other end of the distributor.

The invention will be more clearly understood from the'following description, when taken in connection with the accompanying drawing, in which- Fig. 1 is a vertical axial section through mould and distributor, the showing being essentially dia ammatic only;

Fig. 2 is a si e elevation of the distributor of Fig. 1 as it is viewed in Fig. 1;

Fig. 3 is a transverse section taken on the line 3-3 of Fig. 2;

Fig. 4 is a transverse section taken on the line 4-4 of Fig. 2; and

Fig. 5 is a transverse section taken on the line 5-5 of Fig. 2.

In the drawings, the mould is indicated at 6, mounted for rotation on suitable bearings as indicated at 7. No attempt is made in the drawing to show a bell at one end of the mould as would be'useful were the mould used for making cast iron pipe, but, of course, the interior formation of the mould is unimportant. The distributor or trough is indicated at 8, and the same may be mounted at either or both ends for tilt to discharge its load of metal into the mould by a suitable hand-wheel or the like not shown; in the present instance a bearing at one end i of the trough being indicated at 9, to hold the axis of the same constant during tilting.

As will be readily seen from the drawing, the trough includes first an elongated compartment 10 for holding the entire predetermined charge of metal before starting a casting operation. a

The trough is also provided with a wall 11 in continuation of the elongated wall 12 of the compartment. The wall 11 has a longitudinal edge 13 extending from apoint near one end of the trough to a point near the other end of the trough. Over this edge 13 the entire molten metal contents of the trough is discharged into the mould when the trough is tilted; and according to the present design a'fractional rotation for such is, of course, substantially parallel to or coincident with the axis of rotation of the mould) from one end of the trough to the other.

Operation: It will be seen that the process and ap aratus of the present invention delivers t 1e metal in a rapidly sweeping flow beginning at the end .14 of the trough, thence advances along the edge 13 toward the other end of the trough and to such end, when the trough is tilted, as rapidly as may be desired, one-half turn or more; the metal being delivered along the greater length of the mould in such manner that it is laid in the mould in over-lapping, successively deposited, s irally related subdivisions, minimizing tlie mould breakage as above, and further preventing the trapping of gases and the formation of articles having a orous wall.

efore closing this specification, one particular point should be expressly emphasized,-the idea in back of which is indicated by the language of claim 3 in so far as the nature of edge 13 is concerned. That is to say, edge 13 need not be a single line,

time.

-to the making of a single article of annular cross-section-and an article of comparatively great length axially, as a pipe, but that the process may be applied of course to the making of articles of annular cross-section of any length, one or several thereof at a In that case, however, the process will be carried out as herein described, except that where a lurality of metallic articles of the kind ust stated are to be made simultaneously on each spill of the distributer, the metal discharged from the distributer is additionally confined and guided for congelation against inner surfaces of the mould forming the bounding walls of-annular grooves arranged side by side in the mould interior. In a word, the present invention may be applied in any useful relation and'quite aside from any particular design for the mould interior.

I claim:

1. In the art of makin metallic articles of annular cross-section 0% a length at least as great as the inside diameter thereof, the process of distributing a pre-determined charge of molten metal in the rotary mould of a rotary casting machine, which involves introducing such charge in toto into the chamber bounded by the inside walls of the mould while there confining the charge in an elongated mass completely spaced from the mould but substantially co-extensive with the length of the mould, and then breaking up such mass by transferring the molten metal from the confines of the mass and against the inside surfaces of the mould in a rapidly sweeping flow beginning near one end of the mould and thence running along the length of the mould and terminating near the other end of the mould.

2. In the art of making metallic articles of annular cross-section of a length at least asgreat as the inside diameter thereof, the process of distributing a predetermined charge of molten metal in the rotary mould metal from the confines of the mass and against the inside surfaces of the mould in a sheet of a width equal at least to the inside diameter of the mould, the moltenmetal being thus transferred from said mass to the mould while the sheet is 'further controlled, after an initial spill from the mass, so that at least approximately eighty per cent (80% of the molten metal is transferred from t e mass to themould as the result of a rapid sweepingl of such sheet along the major portion of t e length of the mass from-a point near one end of the mould to a point near the other end of the mould.

3. In a rotary casting machine for making tubular articles having a length at least as great as the inside diameter thereof, in combination with the rotary mould, a distributor for the material of which the centrifugally cast article is to be formed, said distributor being substantiall as long as the'mould and being mounte for disposition within the mould with the center line of the distributor substantially co-incident with the axis of rotation of the mould and for rotation about such center line, there being contained within the distributor an elongated compartment for holding, without spill in a certain position of the distributor, the entire re-determined charge of material for makingthe desired article, the distributor having a wall in continuation of a lon itudinal wall of said compartment, saidfirst mentioned wall having an edge extending from a point near one end of the distributor to a point near the other end of the distributor and'over which edge the material in the distributor is to be discharged into the mould when the distributor is angularly moved about its said center line, said edge being so located that, with the distributor angularly disposed to contain said pre-determined charge without spill, the area defined by said edge, .the line of intersection between the distributor and a'plane parallel to the center line of the distributor and intersecting the latter near a point on said edge near one end of said edge, and a line running from a point near the other end of said edge to the line of intersection of said plane with the distributor, defines a substantially triangular figure.

4. In a rotary casting machine for mak:

ing tubular articles having a length at least as great as the inside diameter thereof, in combination with the rotary mould, a distributor for the material of which the centrifugally cast article is to be formed, said distributor being substantially as long as the mould and'bein mounted for disposition within the mou d with the center line of the distributor substantially co-incident' with the axis of rotation of the mould and for rotation about such center line, there being contained within the distributor an elongated compartment for holding, without spill in a certain position of the distributor, the entire pre-determi'ned charge of material for making the desired article, the distributor havin a wall in continuation of a longitudinal wa l of saidcompartment, said first mentioned wall having an edge extending from a point near one end of the distributor to a point near'the other end of the distributor and over which edge the material in the distributor is to be discharged into the mould when the distributor is angularly moved about its said center line, said edge being substantially a straight line. and gradually diverging more and more away from the center line of the distributor from a pointnear one end of the distributor toa point near the other end of the, distributor.

5.- In the art of making metallic articles I of annular cross-section of a length at least as great as the inside diameter thereof, the

process of distributing a predetermined charge of molten metal in the rotary mould of a rotary casting machine, which involves introducing at least the major part of such charge into the chamber bounded by the inside walls of the mould whilethere confining such part of the charge in an elongated mass completely spaced from the mouldbut substantially co-extensive with the length of the mould, and then breaking up such mass by transferring the molten-.metal from the confines of the mass and against the inside surfaces of the mould in a rapidly sweepin I flow beginning near one end of the moul and thence running along the length of the mould and terminating near the other end of the mould.

Signed at New York, in the county of New York and State of New York this 30th day of March A. D. 1922. I

. WILLIAM W. WEITLING.

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