US1492017A - Means for cooling permanent metal molds - Google Patents

Description

April 29, 1924. 1,492,017

DE FOREST W. CANDLER MEANS FOR COOLING PERMANENT METAL MOLDS 2 Sheets-Sheef] -v Filed May 4. 1922 INVEOR.

A rifl 29 1924, 1,492,017

DE FOREST W. CANDLER MEANS FOR COOLING PERMANENT METAL MOLDS Filed May 4 1,922

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eaTsnr-Y DE FOREST W. CANDLER, F DETROIT, MICHIGAN, ASSIG'NOR. 'I'O GEORGE HOLLEY, OI DETROIT, MICHIGAN.

MEANS FOR. COOLING PERMANENT METAL HOLDS.

Application filed may 4,

To all whom it may concern:

Be it known that I, Dr. FoREs'r W. CAND- LER, a citizen of the United States, residing at 2932 West Grand Boulevard, Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Means for Cooling Permanent Metal Molds, of which the following is a s ecification.

he object of this invention is to rovide meansfor cooling permanent meta molds when used for the continuous production of iron castin s. The novel feature is the means EIOVldBd whereby the cooling fluid, prefera ly air, is intermittently admitted to the hollow molds, the advantages of which are that the cooling fluid is used economically, and, what is more important, should a crack develop in the face of the permanent mold there will be no pressure of the cooling fluid within the mold during the casting o eration so that the castin will not be spoi t by the escape of the coo in fluid through the crack as the escape of 000 mg fluid would cause a depression in the surface of the casting.

An additional object of this invention is to produce soft gray iron castings by avoiding increasing the cooling rate of the molten iron (which produces hard castings) during the period the molten iron is solidifying in the mold.

Figure I shows a sectional elevation of a molding machine to which the air cooling device has been applied.

Figure II shows diagrammatically in plan the means whereby the cooling fluid is distributed to the various hollow molds. In Figure II, A and A" are the legs for supportmg the base, B is the base, C is the driving shaft which rotates the turret D,- E is a horizontal rod projecting from the turret which supports the hollow molds F and G, H is a rojection of the driving shaft C. The shafli I-I carries a casting K, to which itis connected, whereby the piece K is rotated with the turret D, Z is a pipe entering K and supplies the cooling fluid. The piipe Z is supported by the stationary elbow which in itsturn is supported by any convenient means. The pipe Z fits inside the casting K and leakage of the cooling fluid is, prevented by means of the gland Y. The pipe Z, which is stationary, is provided with a port J through which the cooling fluid is 1922. Serial N0. 558,896.

distributed. The casting K is provided with outlets L and M into which are threaded 4 Operation.

Theoperation of the molding machine itself is described in my co-pending application, Ser. No. 504,988, filed October 3, 1921, which discloses the manner in which the molds F and G are separated and the casting, ejected, which is not the subject of the present invention. Immediately after the casti is ejected the cooling fluid is ad'- mitte to the hollow cast iron permanent molds F and G from the elbow X through the valve K and the ipe O and its outlets P and Q. The pipe is so adjusted in the elbow X that t e outlet J comes opposite the openin leading to the pipe 0 in the casting K ust after the casting is ejected from the molds F and G.. Immediate y before the molten iron is poured into the molds F and G, after they have come together once more, the opening J ceases to connect with the passa e 0, so that the air no longer flows through t e mold. By thus cutti ofi the flow of cooling fluid just rior to t e pouring of the iron in the mo d it appears that the quantity of air used is conserved. However, what I have found is ofmore importance is that in the event there are any small cracks or leakages dueto porosity in the mold, then if the air pressure is allowed to remain in the mold during the casting operation itself, the esca e of the cooling air or other cooling fluid t rough the cracks in the mold will s oil the casting and cause'other trouble Wl'llCll will be obvious to any one familiar with the molding art.

I have found that compressed air, at 15 to 25 pounds persquare inch, is the most convenient cooling medium to use, as comparatively small pipes .will supply suflicient cooling fluid so that the escaping air will not exceed 700 F., under which condition the cast iron molds will stand up indefinitely even with molten iron at 27 00 F.

- G slide back and forth as the molds are opened and closed during the casting operation, as described in my co-pending application, Serial No. 504,988, referred to above, and hollow passages 1 and 2 are provided through the center of the guides E and E. These hollow passages connect with the hollow bosses 3 and 4, which support the guides E and E Into the hollow bosses 3 and I Y pipe fittings 5 and 6 are connected by pipeconnections, as shown in Figure II. This pipe 5 isconnected by a pipe fitting 6 to the rotating valve K and an inclined passage 7 connects thispipe 5 with the interior of the air entrance pipe Z. In'Figure I a corresponding pipe is shown leading to the.

opposite set of mold guides. The air flowing through the guides E and E prevents the lubricating oil caking and reduces the power necessary to drive the machine.

What is more important, however, is the fact that there is a considerable quantity of heat dissipated durin the casting operation. This heat causes t e guides to distort and in order to get continuous operation cooling is not only desirable but necessary.

By admitting the cooling air after the casting has solidified the cooling rate of the iron is not increased and therefore the tendency for the cast iron to solidify as white iron is minimized. and the tendency for gray iron to form is assisted.

What I claim is:

1. In arotating casting machine having a permanent hollow iron mold, a pipesupplying cooling fluid under pressure to $2.1 hollow mold, a rotating valve associated with said pipe, an outlet from said valve leading to said hollow mold whereby the flow of the cooling fluid is automatically cut oil during the pouring period.

2. In a rotating casting machine in which castings are successivel poured and ejected at each revolution of he casting machine,

a hollow metal mold, a, stationary pipe supplying cooling fluid under pressure to said hollow mold, a rotating valve associated with said pipe, an outlet from said valve leading to said hollow mold whereby the flow of cooling fluid is -automatically out off during the pouring period.

3. In a rotating casting machine in which castings are successively poured and ejected at each revolution of the casting machine,

a plurality of hollow metal molds, a stationary pipe supplying cooling fluid under pressure to said hollow molds, a rotating valve associated with said pipe, a pluralityof outlets from said valve leading to saidhollow metal molds whereby the flow of cooling fluid is successively cut ofl from each hollow mold during the pouring period.

4. In a rotating castingmachine havin a permanent hollow iron mold, a pi e suppying air under pressure'to said ho ow mold, rotating valve associated with said pipe, an outlet from said valve leading to said hollow mold, whereb the flow of air is .automatically out 0 during the pouring period.

5. In a rotating casting'machine in which castings are successively poured and ejeqted ,at each revolution of the casting machine, a,

hollow metal mold, a stationary pipe supplying air under pressure to said hollow mold, a rotating valve associated with said pipe, anoutlet from said valve leading to said hollow mold whereby the flow of air is automatically out 01f during the pouring period.

6. In a rotating casting machine in which castings are successively poured and ejected at each revolution of the casting machine, a plurality of hollow metal molds, a stationary pipe supplying air under pressure to said hollow molds, arotating valve associated with said pipe, a plurality of outlets from said valve leading to said hollow metal molds whereby the flow of air is successively cut off from each hollow mold during the pouring period.

7. Ina rotating casting machine having a plurality of permanent metal molds, slidably mounted upon rotating guides, hollow passages within said guides, and a plurality of pipes conveying cooling fluid to said passages within said hollowguides, for the purpose described.

In testimony whereof I aflix my signature.

ns r-onns'r w. OANDLER.

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