US1466826A - Centrifugal mold - Google Patents

Description

Sept. 4, 1923.

W. A. GORDON GENTRIFUGAL MOLD 2 Shet s-Sheet 1 Filed Aug. 31. 1922 v LU w. A. GORDON CENTRIFUGAL MOLD Filed Aug. 31. 1922 Patented Sept; T4, 1923.

WILLIAM A. eonnon, or snm'rorr, comc'rrcur, ASSIGNOR' 'ro ammnenam mow rounnnr, or DERBY, commcrrcur, A conrona'rron or CoImECrICu'r.

Curran-near; mom).

Application filed. August 31, 1922. Serial No. 585,393.

To all whom it Be it known that Lwmnmm A. Gonnon, a citizen of the United States, residing at Shelton, in the county of Fairfield andfor casting metal having molds which are capable of being rapidly rotated when the molten metal is poured and while it is cooling in order to ensure homogeneity and density of the metal and freedom from gas holes, surface cracks and unequal internal shrinkage stresses. 7 The object of the invention'is to provide a simple apparatus having a, construction that can be readily adapted to cast solid or hollow bodies ofdifierent sizes and shapes and which will operate with a minimum amount of powerand will compact the metalinto a desired eonditiom- This object is attained by providing a frame with rotating means arranged in such a manner that molds or flasks of various sizes maybe substituted one for the other on the-rotating means;,in so constructing the molds that dilierent plugs of refractory material having chambers'of difierent sizes and shapes may be inserted into the'ch-illing and supporting body, and. in so designing the mold intake that the metal on entering is directed toward the chilling wall of the mold chamber and when it reaches there it whirling with the rotating mold.

Figure 1 of the accompanymgdrawmgs shows a plan of an a paratus which embodies the invention. ig. 2 shows a vertical longitudinal segtion of the same. Fig. '3'is a view looking toward the intake'end with the feed kettle or trough removed-.

Fig. 4 shows a transverse section of the mold taken on the plane indicated by the'dotted line 4 on Fig. 2." 5 is asimila-r section pith a mold gate or intake plug'of modified orm.

The mold or flask has a substantial metal hollow cylinder 1, preferably cast iron.

cylinder forms t ing part of the apparatus and also acts to conduct heat rapidly from the molten metal, that is, to chill the metal cast therein. The {ends of the cylinder are counterbored to sfilfienlarge the chambertherein. In the counfastened to the end of the cylinder.

e body of the rotat-.

of sand, fire clay or other suitable refrac torymaterial, with an axial gas vent 3. This plug is held in place by a plate 5 that is detachably fastened to the end of the cylinder. In the coimterbore at the other end is a metallic shell 6 that is detachably in this shell and held by a detachable plate 7 1s a chambered plug 8 of sand, fire cla or other suitable refractory material. his plug has an axial inlet or gate opening 9 and leading inward and branching outward from'which to the inner wall of the-chamber in the cylinder are 'assag'es 10, these passagelsi and the moat forming a Y-shaped mta e.

The body is mounted near the intake and on a pair of rolls 11 that-are spaced some distance apart,-and near the other end on a pair of spaced rolls 12, the latter rolls preferably having annular ribs 13 that fit into an annular groove 14 in the periphery of the cylinder.

or bed. One ofth'e shafts is extended and provided with a pulley 18 which may be driven from any convenient source. of power. 'When the pulley is rotated the mold is given a rotation by the rolls which support it,.and the ribs on the rolls-at one end 7 revent endwise movement .of the mold. ounted on the frame and extending about the intake and of the mold is a guard 19 and mounted on the frame and extending abo1it,

the other end is a guard 20.

' On each side of the mold near the middle are a pair of upright posts 21 and extending across the cylinder and. held. by these posts is'a'beam 22,-.on one side of which is an angle iron 23. This beam or the angle iron is designed to prevent the mold from jumpingoutof lace when it is rotated. The elevation of t beam may be altered, to permit molds of different diameters to be placed on the rolls.

' The feedkettle or trou h arranged adjacent to the intake end 0 the mold has a metallic Easing '24 in which is placed a lin-. ing 25 of san ,fire clay! or other refracto material. This casing has a nose 26 that is fitted into an'opening in the center of the plate 7 about the intake opening throu h the plug 8. A throat 27 leads through t e refractory linin from the opening in this kettle to the inta e opening-in the plug.

. Molten metal poured into the kettle flows through the throat and is thrown outward through the Y-shaped gate opening in the entrance plug so that it is whirling at about the same speed that the mold isrotated when it reaches the chamber in the mold cylinder. Plugs having different shaped openings may be substituted for those shown.

Instead of having the gate opening for admittin metalto the mold Y- aped, the preferre form, a triangular gate opening which accomplishes practically the same result, may be made by simply removing the refractory material 28 between thebranches of the Y. This would leave the intake passage in the form illustrated in Fig. 5 rather *andonl a relatively slight axial opening,

as'a r0 er with trunnions is to be cast no core need be used. When the apparatus is in operation the metal is thrown to the exterior of the chamber in the metal cylinder and is compacted solidly as it is chilled, by

- casting without surface cracks,

the centrifugal'action which fpredominates over gravity and which is acilitated by the form of the intake opening that directs.

the metal to the outside of the chamber and whirls it rapidly before it reaches thechamher. This ensures a dense homogeneous blow holes, and irregular shrinkage stresses.

The invention claimed is:

1. A centrifu l casting apparatus comprising a rotata 1e but longitudinally fixed cylindrical mold, means forrotating the mold,.and means for feeding molten metalto the axis of the mold, said mold having a rotatable intake that extends obli uely outward in opposite directions from t 0 axis to the inner wall of the molding chamber whereby the molten metal is caused to whir by being carried in said oblique intake at the same rate of s eed as the rotating inner wall 8: the mold w en it reaches the mold cham- 2. A centrifugal casting apparatus hav-j ing a rotatable mold, means for rotating the mold, and means for feeding molten metal to the axis of the mold, said mold having a Y-shapedintake opening that extends ohliquelx from the axis of the mold. a

3. centrifugal casting apparatus having a rotatable'mold, means for. rotating the mold,and means for feeding molten metal to the axis of the mold, said moldcomprising a cast metal cylinder with counter-bored ends and refractory plugs inserted into said counterbored ends, one of said plugs having a Y-shaped intake 0 WEE A.

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