US1618245A - Pipe-molding machine - Google Patents

Description

' 1,618,245 Feb. 22, 1927. S. M UDALE PIPE MOLDING MACHINE Fil F 28, 1925 2 Sheets-Sheet 2 I N VEN TOR on the plane 3-3 of Figure Patented Feb. 22, 1927.

UNITED. STATES 1,618,245 PATENT OFFICE.

STANLEY M. UDALE, OF DETROIT, MICHIGAN, ASSIGNOR TO EARL HOLLEY, F DETROIT, MICHIGAN.

PIPE-momma macnmn.

Application filed February 28, 1925. Serial No. 12,221.

3 This invention relates to means for casting iron pipes in metal molds. The specific objectof this invention is to provide means whereby pipes may be cast in stationary metal molds, the molds being held in a horizontal position, and'the center being formed by a core.

.Figu're 1 shows a plan view oi the machine. v

Figure 2 shows a cross sectional elevation on the plane 2-2 of Figure 1.

Figure 3 shows a cross sectional elevation 1. I Figure ishows across sectional on the plane 4-4 of Figure 1.

In the'figures, A and'B arefthe two halves of the stationary metal mold, split on the vertical plane and located in the horizontal position. i C G C are thesupports for the part A of the mold. Thesesupports are bolted to the floor. D,D D are the bars which apply ressure to'the right hand half vB of the mol The bars D D are threaded and pinned to the bosses E E E projecting from the mold B. The D 'D' D are operated by the cylinders FF F through the pistons G G G reciprocating therein, as shown in'Figure 2. i

Compressed air connections HH H are provided together with suitable port connections LL and M M M andtwo-way valves J J a J. A core W is shown supported on bearings V V, which are integral with the core supports T T. These core supports Tare adapted to move through a small arc of a circle, being pivoted at U. The compressed air which is admitted through the pipes H H H is controlled by two-way valves J J J which in its turn are controlled by levers K K K; Compressed air admitted through H'H H passes the valves J J J and communicates with the cylinders F F F through the elbows L L L, 5 where it acts on the side of the pistons G G G and causes the mold B to separate from the mold A. i

When the lever K is 'depressed compressed air is admittted through H, past the twoway valves J J J and through the elbows M M M to the back of the pistons G G G, thus causing the mold B to close onto the mold half A. By connecting the pipes H H H to the same source of compressed air uniformity'in pressure is assured.

' The entrance of the'iron t0 the'mold 15 elevation pressed air is admitted through L so as to provided through a plurality of gates S S. These gates are preferably of the diamond shape as shown, for the purpose to be de scribed later. Small vents Y Y are provided for the escape of the air between the gates.

In order to support the core when it is placed in position, and also to support the casting when it is'ejected from the mold, core supports T T are provided. These are hinged at U and provided with a bearing V in whichthe core W is supported. In order to center the mold in positiondowel pins X X X are provided, see Figure 2. These dowel pins, which are threaded and are made from hexagon stock, also bolt the mold A to the moldsupports C C C.

The molds are preferably coated with a dilute solution of sodium silicate in water containing a considerable quantity of fire cla in suspension, as set forth in the patent to eloche, #1,453,593. The molds are also preferably provided with a relatively thick coating of lampblack, as described in the patent to Meloche, $21,492,694. The molds are also raised to a temperature of about 700 or 800 F., as also described in the above patent, the object beingto eliminate as far as possible the need for prolon ed annealing;;the casting as ejected from t e mold being substantially gray iron, free from white iron.

Operation.A core W is placed in the bearings V V of the core sup orts T T. Air pressure is then admitted b hind the piston G and the core pushed into place in the mold A, carried by the rocking supports T T, and the mold half D closing upon the mold half A, guided by the dowel pins X X X. Pressure is then admitted to the rear of the piston G,.so that separate pressure is exerted between the two halves of the molds A B to prevent iron leaking when it is oured in,

olten iron is then poured in through the gatesS S and the mold filled up, the air escaping through the vents Y Y Y. When the iron has set in the mold the valves K K- are moved into the position shown and com-j forcibly o n the mold. If the castin remains in this mold half A it is ejected t erefrom by hand by means of the mechanism Q .R, see FigureB, If,on the other hand, as casting is carried by the mold B'it will he released therefrom by the impact of the knockouts O 0 against the adjustable-stops P 1. Meanwhile the core supports T T will rock back on the pivots U U into the horizontal position and the pipe will be sup ported upon the core, which is re-enforeed with a metal center.

The casting is ejected as soon as it has set suliioientl to' be handled, and while it is still red hot (1600 F.). For this reason the problem of shrinkage is practically eliminated. However, by making the gates S S in the elongated diamonds, as shown, the only effect of contraction is to slightly Wedge the molds apart. However, gray iron has the well-known property of expanding immediately after it freezes, due to the precipitation out of solution of the graphite which has a. relatively low density, so that the problem of shrinkage is not at all serious. A more diflicult problem is to preve'nt'tlie iron leaking on the parting line, and to prevent this a substantial pressure must be applied (over 1,000 pounds per foot).

What I claim is A pi holding machine, comprising a substantia 1y horizontal two-part metal mold split in the vertical plane, means for supportin one half, means for translating the other alf in a substantially horizontal plane, a movable core support adapted to guide the core into place upon the" closure of the mold, and to support the casting when it is ejected from the mold.

In testimony whereof I affix my signature.

STANLEY M. UDALE.

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