US1776542A - Cooling system - Google Patents

Description

A Sept. 23, 1930. F. G. ARRlNGTQN COOLING SYSTEM Filed March 5,- 1927 2 Sh'ets-Sheet 1 n attain/aq! sept. z3, 1930.

F. G. CARRINGTQN COOLING' SYSTEM Filed Maren 3, 1927 2 Sheets-Shoot 2 Patented Sept. 23, 1930- UNITED STATES PATENT OFFICE FRANK G. CARRINGTON, OF ANNISTON, ALABAMA, ASSIGNOR TO FERRIC ENGINEER- INGIl COMPANY, F ANNISTON, ALABAMA, A CORPORATION OF DELAWARE COOLING Application filedl March 3,

This invention relates in general to a cooling system and more particularly relates to a cooling system for a centrifugal casting apparatus.

Any annular object may be cast by a centrifugal, or rotary, casting process, and, while I shall illustrate and describe this 'invention with particular reference to a pipe casting operation, it is to be understood that the extent of this invention in no Way limited to its application to the casting of pipe. The

` cooling system may be employed wherever pouring trough metal is deposited longitudinally -in a mold, quite regardless of the object cast.

The rotary process, in general, comprises depositing molten metal in a revolving mold. The rotation of the mold generates centrifugal force Which serves to distribute and maintain the metal upon the interior surface of the mold. This forms a tubular shell which, after hardening, may be removed from the mold.

The fluidity or solidity of the metal is largely dependent upon its heat.- As proper distribution of the metal 'in the mold is impossible if the metal is not in a fiuid state, and inasmuch Yas .an excess of heat injures the metal, the importance of adequate heat control in this process is apparent.

Three general types. of mold are employed, each type requiring a different cooling treatment.

In the first type of mold, metal is poured just Within one end and distributed longitudinally by manipulation of the mold.

lIn the second type the metal is distributed substantially the length of the mold by pouring it over the side of a so-called dump trough, which is rotated upon its longitudinal axis.

In the third type of mold a so-called end is employed over which the mold telescopes. They rotation of the mold and relative movement of the trough and mold cause the metal to build up within the mold in successive spiral columns. These columns coalesce, formi-ng a tube of substantiallyuniform thickness.

While this invention maybe adapted for use in connection with any of the above types,

SYSTEM 1927. seriai No. 172,355.

it particularly relates to the third type of tei-nal heat of the metal is absorbed at a rapld .ilate by the mold, rendingthe metal less The metal is cooled to such an extent lthat on boing poured in the-metal mold it becomes viscous almost immediately upon touching the mold, and rapidly solidifies. The smooth and even tubular formation cannot therefore be obtained merely by reason of the generated centrifugal force, as is the case in the employment ofthe other types of molds, but the metal must be so deposited that a minimum flow of the metal is necessary to obtain a perfect tube.

One of the advantages of the third type of molds over the others is that the mold may be used for a larger number of operations. But in order to achieve this longevity it is necessary to counteract the excessive heat absorbed by the mold, heretofore mentioned.

Various methods have been adopted to effect this cooling, most of which have taken the form of Water jackets surrounding the mold. Also some have consisted in sprinkling the exterior surface of the mold With a cooling medium. But regardless of the form of this cooling, there has resulted a sudden chilling of the metal upon its being poured in the mold. In the system previously employed, in order to accomplish any effective cooling it has been necessary to cool the mold before the metal is poured. Even if the cooling is commenced at the moment the metal begins to pour, there is a portion of the mold which Ais prematurely cooled. The pouring is usually started at the bell end of the pipe and if the commencement ofthe pourmg is concomitant, it will be noted that the spigot end will be exposed to the cooling during the whole time that the metal is being poured longitudinally of the mold and without any counteraction, such as molten metal on its interior surface.

Quite aside from the chilling at the spigot end Which results from such a\ process, there is a difference in texture along the length of the pipe, for variance plunger is operated by a rod 22, which is attached to a support 23 on a truck 24., This truck also contains a ladle 25 which discharges molten metal into a pouring trough 26. This trough is supported on the truck 24 and extends within the mold, pouring from its spout 27 the molten metal 28'longitudinally on the interior wall of the mold. As the truck 24 rolls, by means of Wheels 29, on a track 31, the trough moves axially in the mold. At the Sametime the plunger will be moved by the rod 22 in the dispersing pipe 14, and in doing so the length of the pipe which is in operation varies.

'Ihe trough 26 is Withdrawn from the mold during the pouring operation, effectingV a spiral deposition of the molten metal. It will be observed that in Fig. 1 the length of the rod 22 is such that'the plunger 21 isV maintained directly above the spout 27 of the trough. Consequently only that portion of the mold which contains Within its shell oured metal is cooled, and the cooling efect, because of the special relationship of 25 the plunger 21 and the end of the pouring trough, is exactly coincidental. The mold is not sprayed or sprinkled with the cooling medium until there has molten metal, yet all tains metal is cooled. on the exterior of the the moment metal is mold, and the cooling valve 19 cuts olf the dium. In Fig. 2 there is shown the arcuate formation of the support member l2, but it is of course not necessary that the member be of this particular shape. An enlarged portion at its free end forms an eye 28 in Which the pipe is held. While only one dispersing pipe is shown, there may be a plurality employed, each Working upon the same principle applied to the single pipe described.

Under certain circumstances it may be desirable to cool the mold before molten metal is deposited Within it, as shown in Fig. 3. In this case the rod 22 is shorter than the trough, Which causes the plunger 21 to precede the spout in the longitudinal movement along the mold. The extent should precede the trough'depends upon the conditions of the casting operation. With the arrangement set forth in Fig. 3, each portion of the mold is cooled before metal is deposited on its interior surface.

Or it may be desirable under peculiar conditions to have the molten metal poured in a mold that has not been subjected to any artificial cooling and then, after t-he metal has been imposed on the interior, to subject the mold to additional cooling. rl"he apparatus shown in Fig. 4 elfects such a cooling. It Will be observed that the spout of the trough precedes the plunger 21 along the length of the mold.

been deposited within it of the mold which con- 30 mold is commenced at deposited Within the is continued until the supply of cooling me- Cooling of any point to which the plunger The extent of this precedence will be governed by the conditions of the casting operation.

From the foregoing, yit can be seen how this invention overcomes theV diculties inherent in .cooling systems heretofore used. Each portion of the mold is subjected to cooling at a predetermined relation to the pouring of metal Within that portion. The diiiiculty heretofore experienced has resulted from the lack of a uniform temperature of the mold along its length at the time it receives the metal. By my invention the desired uniform heat is obtained, the degree of .heat being susceptible to regulation, but always uniform longitudinally. The chilling of the outervshell of the casted object is therefore to a large extent non-existent in this type of cooling and the pipe may be removed from the mold and, without the annealing process now necessary, is capable of immediate commercial use.

-While I have shown and described the :preferred embodiment of my invention. Iv

wish it to be understood that I do not confine myself to the precise details of construction herein set forth, by way of illustration, as it is apparent that many changes and variations may be made therein, by those skilled in the art, Without departing from the spirit of the invention, or exceeding the scope of the appended claims.

I claim:

1. A rotary casting apparatus comprising a rotatable mold, a sprinkling member for the mold, and means for varying the operative length of said member.

2. In combination with a revolving mold and a pouring trough, a cooling system comprising a cooling member and means coactmg with the trough to vary the operatlve length of said member.

3. A casting apparatus comprising a rotatable mold, a cooling member for the mold and means to continuously extend the cooling at a predetermined rate With respect. to a deposition of molten metal Within the mold.

4. In combination with a revolving mold and a pouring trough, a cooling system for the mold comprising'a sprinkling member and means within said member and courting with the trough to vary the operative length of said sprinkling member.

5. In combination with avrotatable mold and a pouring trough, a cooling system comprising a member adapted to sprinkle a cooling medium upon the mold, and a plunger slidable in said member as molten metal is deposited Within the mol A 6. In combination with a -rot-atable mold and a trough adapted to pour molten metal ylong ,lfitudinally Within the mold, a cooling system comprising a sprinkling member` a plunger slidably mounted in said member and y means coacting with the said trough for Sliding the plunger.

7. In1 a centrifugal casting apparatus, a mold cooling system comprising a cooling member, means for varying the operative length `of the coolingmember, and actuating means for the last mentioned means whereby the cooling coincideswith the deposition of molten metal within the mold. j

8. In combination with a rotatable mold having a pouringtrough movable relative t0 the mold, an apertured pipe positioned to disperse a coolin medium on said mold, a movable plunger 1n said pipe and means for introducing a cooling medium in said pipe.

, 9 In combination with a rotatable 4mold having a pouring trough movable relatively to the mold, a pipe positioned to disperse a cooling medium on said mold, a movable plunger in said pipe coacting with the trough and means for introducing a cooling medium in said pipe. j

10. In combination with a centrifugal casting apparatus which comprises a -rotary mold horizontally mounted, and a vpouring trough, a perforated pipe mounted stationary with respect to the mold, means for supporting the pipe horizontally adjacent said mold,

and adapted to disperse a cooling medium thereon, means for introducing a cooling trough that the portion of the' mold cooled` by the medium dis ersed from said apertured -pipe coincides wit the deposition of molten metal within the mold.

13. A cooling system for a centrifugal casting apparatus comprising a cooling member, and means for varying the operative length of the member, said means comprising a plunger slidable in the cooling member and operatively associated with a metal pouring device.

In testimon whereof I affix m .si nature.

F ANKG. CARR NG ON.

medium into said pipe adjacent one end A thereof, a plunger s'lidably mounted in said pipe' and means stationary with respectto the trough forsliding said plunger to vary the portion of said pipe to which said medium isadmitted. y

11. A centrifugal casting apparatus comprising a. rotatable mold, a bearin member pipe being supported by a bearing member, A

or rotatably supporting one en of said mold, means for supportlng the other end ofy said mold, a pouring trough mechanism associated with `said rotatable mold, said mold and pouring trough being movable relatively to each other, an apertured pipe positioned above said rotatable mold, one end of said the other end of said pipe .being supported by a member associated with the base of said casting apparatus, means for introducing a cooling medium into one end of said apertured pipe, .a plunger slidably mounted in' said plpe, a rod connecting said plunger with a portion of saidA pouring trough mechanism for varying the cooling capacity of said apertured pipe as metal from said pouring trough is deposited in said mold. A 12. In combination with a centrifugal casting apparatus having arevolving mold and a pouring trough associated therewith, a cooling system comprising an apertured pipe positioned adjacent the mold and adapted todispcrse a cooling medium thereon, means slidable within said apertured pipe to vary the eectiveness of said apertured pipe, said means being so associated with the pouring

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