US1776546A - Cooling system - Google Patents

Description

@ p 0- I F. G. CARRINCIETON 1,776,546

' COOLING SYSTEM Filed May 11, 1927 2 Sheets-Sheet 1 Sept 1930- F. G; QARRINGTCN 1,776,546

COOLI NG SYSTEM Filed May 11, 1927 2 Sheets-Sheet 2 gwwwtoo mold depends to a'large extent upon Patented Sept. 23, 1930' rash e. on

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,l ananams, assronon nnnrsron, ALABAMA, A coaroaarron or DELAWARE T0 manic ENGINEER coonme srsrmr 7 Application filed Hayll,

This invention relates to a cooling system and more particularly to a cooling system for a centrifugal casting mold.

The rotary or centrifugal casting process is used (Elite extensively in the'manufacture of 'pi e an annular object may be process. While I tion by a pipe casting process, it is of course to be understood that its use is notconfined thereto. I I

Heretofore, molds have been cooled either by surrounding the'mold with a Water jacket or sprinkling upon theexterior ofthe mold a cooling medium. But regardless: of the method employed there have ensued certain undesirable results.

The cooling of the entire mold is commenced at the same time. But, in the case of the last-mentioned mold, the metal is poured progressively along the length of the mold, and difierent portions of the mold along its length receive the poured metal at difierent moments. Inasmuch as the temperature ofha length of'timeit has been subjected to a-coolrmed by this I ing effect, this means that there is a variance spigot end, as is usually the case,

in the temperature of the mold along its length at the time metal is poured, for certain portions, prior to receiving molten metal, have been subjected to the cooling action for longer periods than other portions. For instance, assuming that the pouring is commenced at the bell end and terminated at the that portionof the mold at the spigot end, ment the metal is poured there, has been exposed to a continuous cooling, uncounteracted by the heat of molten metal, for a longer period than the bell and of the mold. As the texture of a casting operation is dependent to alcertaineextentupon its cooling, there has resulted a variancein the texture between the two ends of the pipe.

But 'a mbre serious problem confrontedwhen the; previous systems are employed resides "iii-a case-chilling of the cast object. This is due tothe sudden cooling of theexterior of the "object. In order to render a pipe-Which is chilled ,inthis manner. usable in ut is not limited to pifpe casting, forshall illustrate my invenat the mo- 1927. Serial No. 190,624.

'ordinary'comznercialoperations, it is neceserable time.

Asidefrom the deleterious efl'ects on the casting resulting from the use of theprior cooling" systems, uneven stresses are set up along. the length of the mold, and it has been found that after relatively short use, the mold fails at thespigot end. i To overcome these difiiculties is one of the objects of this invention. Another object is to provide a cooling system for use in a centrifugal casting apparatus.

Still another object is to provide a cooling system whereby a mold in a centrifugal casting apparatus may be gradually cooled.

A still further object is to provide a cooling system for progressively cooling a rotary mold along its longitudinal axis.

, And yet another object is a cooling system whereby the cooling of the mold is effected at a predetermined relationship to the cooling of the mold. I

To accomplish these and other objects, as willmore fully appear hereinafter, my invention comprises a cooling member and meanstoso regulate said member that the coolingefiect is gradual.

Reference'is made to the accompanying ,drawingafwhich set forth one embodiment ofadevice-by the use of which the advantages "of my; invention may be obtained. It is of course obvious that many modifications of the apparatusherein set forth may be made without exceeding the 'scope of the invention.

Figure 1 isa side view of a mold and cooling system partly in elevation and partly in section;

2 is an end elevational view of the mold and cpoling apparatus shown in Fig, 1;

Fig. 3 is a cross sectional view of the. valve along the line 33 of Fig. 1, looking in the direction of the arrows; I I v Fig. 4' is a partial sectional view of the valye, in detailalong the line 44 of looking in the direction of the arrows,-

Ibo

dium. An intake pipe 16 supplies Fig. 7 is a cross sectionaliview of another modified form of valve.

Referring more particularly to Fig. 1, there is shown a mold 1 with an enlargement 2 at one end for the formation of a bell of the cast pipe. The mold is rotatably mounted upon trunnions 3, which are supported It}.

roller boxes-4 suitably affixed to a base 5. T e mold is rotated by suitable driving means, not shown. The. mold is also partiallysupported by a bearing member dhaving grooves therein, into which fits a corresponding feather 7 on the exterior of the mold. This arrangement prevents axial movement of the mold, but permits of its rotation. The bearing may be either of the splittype or have a split bushing. Supported in the bearing member 6 and also by a standard 8, suitably mounted on the base, is a chamber9 with apertures 11. Bafiies 12 are spaced within the chamber 9 forming fluid tight-sections.

To each section there is connected a feed pipe 13. Each feed pipe is independent, although all are enclosed for a portion of their lengths Within a casing 14. It will thus be seen that each of the sections may be individually operated. All of the feed pipes are supplied with a ooolingmedium through a valve 15. The valve herein shown is of the rotary multiple type, although any other suitable valve may be employed. This valve cuts into operation successive feed pipes, which in turn fill successive sections of the dispersing chamber 9 with the cooling methe necessar cooling medium. s

he'valve is operated by a shaft 17. A fluid tight gland 18 is provided on the valve where the shaft 17 enters. A roller or gear 19 is provided on the shaft, and operative means, shown in Fig. 5, rotate the shaft 17 at a desired rate. I r In Fig. 2 is shown the shape of the standard 8, although it is not necessary that. it be arcuate as shown in the drawings. The casing 14 extends throughout the upright portion of the supply pipes, acting both as a protective device for the pipes and aiding in their support. The dispersing member 9 is the valve 22, is provided with an arcuate aperture 23. Ports 24 located in the valve and connected to the feed pipes by screwthreading or othersuitable means, terminate Except for the aperture 23, the disk 21 prevents the entrance of a cooling medium into the ports. The arrangement of the ports 24 is partially circular and the aperture 23 is 10- cated in the disk 21 so that it describes in its rotation the are formed by the ports. As the disk 21 is rotated, the aperture 23 passes over the ports of the pipes in succession, un-

covering successi'vesupply pipes; which in turn feed correspondlng' sectlons 1n the dispersing chamber 9. In order to obtain apro- I gression of adjacent sections of .thekdispers ing chamber9, ports for successive sections should be adjacent one another. The disk 21 is integral with the shaft 17, and its speed therefore may be regulated (and the rate at which successive sections ,are brought into operation) by the rotative regulation of the shaft 17. v In Fig. 4there is shown a chamber'25' in which the cooling medium. is held prior to its entrance in theports. The disk 21 is held in close contact with the body 22 by suitable means, shown in this figure as a helical spring 26. A collar 27 on theshaft 17 fits in a proper Well 28 on a plate '29 of the valve. The plate 29 may be detached for repairing, and is held in fluid-tight contact with the body of the valve by bolts 31. By means of; the spring 26, both the disk 21 is held against the body 22 and the collar-27 is maintained. in a non-leaking contact in the well 28. At points of contact between the various parts washe'rs or packing may be employed.

In Fig. 5, I have shown diagrammatically means for synchronizing the-cooling of the mold and pouring of the metal, in order toinsure cooling at a definite rate with respect to the pouring of the metal. 1

A carriage 32, provided with wheels 33,

' {carriesa cooling trough 34. A ladle 35 is also mounted upon the carriage 32. The

carriage runs on a track 36.

There is an arm 37 on the carriage 32, which supports a sl'eeve38. This sleeve takes in a worm shaft 39. Rotation ofthe shaft, therefore, causes the carriage 32 'to be moved along the track 36. e s A motor 41 is providedto drive the worm shaft 39. One end of the Worm shaft ter-- Inmates in a gear reducing apparatus .42, which also houses and joins the gear 19 with the worm shaft 39. The proper gearin'gin this rotating apparatus must be determlned for each machine depending upon the rate of cooling desired. Rotation of the worm shaft -therefore not only causes movement of the carriage 32,- but operates the rotary. valve 15 which governs the cooling.

The arrangemer-it of thi apparatu'sjssus- .ceptible of many modifications. It may be desirable to have a coolingof any portion-of the mold coincidental-wit the deposition of molten metal within that portion. Again it in 'theface of the body portion 22 of the valve. may be desirable to cool the portions-prior 1 with respect thereto, it is -to be understood that the cooling system may be adapted tea casting apparatus wherein the mo d moves while the trough remains stationary,

which both the'trough and mold move.

It is sometimes desirable to vary the coolor in ing eifect in the sections during the time they are in operation. For instance,

it may be desirable to cool the mold at a greater rate at the moment metal is being poured in 'a section and then to have the cooling decrease. Or again, it may be desirable to gradually increase the cooling of a section of the mold. Such variations may. be accomplished by changing the shape of the slot 23 in the dis 21 In'Fig. 6 I have shown a slot 43 in the disk 5 V 21 whereby the amohnt of cooling medium entering the ports 24 decreases as the disk rotates. There is shown a port 24 fully opened, but it will be observed that as the disk 21 rotates in the direction of the arrow,

- the slot 43 diminishes in size and consequently closes progressively the port 24'. As above stated, many variations may be desired in the coolin of a section of the mold, and such modified orms of cooling may be effected by altering the shapeof the .slot. For instance, if the left side of the slot is smaller than the right end therewould be' an increase in the amount of cooling medium admitted to the ports 24 as the disk is rotated.

Where I have referred'to a cooling medium,

any cooling fluid, either liquid or gas, is

meant.

'It will be'noted that each section of the.

dispersing pipe 9 is connected with an individual ,feed pipe which is'joined to ports 24 in the valve 15. The baflles 12'prevent any leakage of a cooling medium from one seetion to another, and the introduction of a cooling medium into one ofthe sugpl pipes means that only that section will e ispersing the medium. I

The apertures 23 or 43 on the disk 21 in rotating over the ports of the supply pipes open progressively additional pipes, and in so doing permit the entry of the cooling medium into the pipes. Thus chamber 25 is kept filled by a cooling fluid entering the chamber through the feed pipe 16.

In operation, the trough shown in Fig. 5,

extending within themold 1, commences the pouring operation, usually at the bell end,

and, while continuing to pour-metal, is grad- I ually withdrawnr towand the opposite end.

The shaft 17 may be rotated atsuch a rate that anew section of the dispersing member '9 will be cut into operation as the metal is oured within that portion of the mold cooled y the section. This rotation may be effectedby independent means such as a motor, cylinder, or other timing device, synchronized with the relative movement of the trough in the mold, or it may coact directly with the trough, as above described.

The cooling systems described above comprehend an incremental cooling. In these systems additional cooling segments are add.-

I aperture 44, which uncovers only one port 24 at a time, in contradistinction to the slot 23 or 43 which on opening a port does not-close the receding port. T e disk 21 shown in Figure 7 rotates, as in the case of the other disks, but the aperture 44 uncovers only one ort. As an additional port is opened the 'ace of the disk 21 covers up the preceding port. With this arrangement the sections in the cooling memher 9 are progressively brought into oper ation. As each compartment commences to disperse a cooling medium, the preceding section ceases to function. In this way there will be a spray of cooling medium dispersed on the mold, the length of the spray being that of the sections in member 9, and the cooling progresses by steps along the length of the mold 1. I

Marry modifications may be made in the disk 21 to give varied cooling to the mold, and I have set forth only a few such modifications in this application. It is to be understood that variations made in the shape and size of the slot or aperture in the disk 21. do not exceed the scope of this invention.

It may be desirable to position on the pipe 16 a pressure regulating valve so that the amount of cooling medium dispersed from "the member 9 will remain constant, regard:

by steps, metal is the deposition of metal, and while it is prefperforated portion of the valve mechanism erable that the area of cooling be practically v and means-for rotating said disk to selec co-extensive with the deposited metal, 'the cooling may be so arranged as to precede or succeed the depositioii,depending upon the extent of cooling demanded. If a section is brought into operation before metal is poured Within the area of the mold cooled by'that section, a greater cooling would be effected.

The reverseof this is equally true. But regardless 'ofthe exact time relationship, there will be a gradual and longitudinally progressive cooling of'the mold at a determined relationship to the pouring of metal, which will obviate to a great extent, if not altogether, the necessity of an annealing process subsequent to the casting operation.

While I have shown and described the preferred embodiment of my invention, I wish it to be understood that I do not contine'myself to the precisedetails' of construction herein set forth, by wayof illustration, as it is ap-,

' parent 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: i i

1. A centrifugal casting apparatus comprising a rotary mold, a trough for depositing molten metal in said mold, means for -moving said trough axiallof said mold, a

fluid dispersing member apted to disperse a cooling medium on said mold, means dividing said member into a plurality of sections,

a rotary valve mechanism, a conduit connecting each'of'said sections with said valve mechanism and means for-supplying a cooling medium to said valve mechanism.

- 2. A centrifugal casting apparatus comprising a-rotarymold, a trough for depositmgmolten metal in said mold, means for movin said troughaxially of said mold, a

fluid dispersing member arranged to disperse a cooling medium on said mold, means divid ing said member into a plurality of sections, a rotary valve mechanism, a conduit connect-v ing each of said sections with said. valve mechanism and means for suppl a cooling medium to said valve mec anism and means associated with said trough 'moving means for operating said valve mechanism.

3.;A' centrifugal casting apparatus comprising a rotary mold, altrough for tlepositing molten metal in said mold, means for moving said trough axially ofsaid mold, a

fluid. dispersing member positioned toilcool said .mold, means dividing said member'into a plurality of sections, a rotary. valve mechanism, means for supplying afcoohng a um to said valve mec anism, said valve mechanism comprisinga' perforated body member, conduits connectln each of saidperforations with a section of t e dispersing memberyan apertured disk positioned to move ovensaud.

tively supply a cooling medium to the sec tions of said member. s

.4. A centrifugal casting apparatus com prising a rotary mold, a trough for depositi'ng molten metal in said mold, means for movin said trough axially of said mold, a fluid said mold, means dividing said member into a plurality of sections, a rotary valve mechispersingmember positioned to cool.

anism, means for supplying a cooling medium to said valve mechanism, said valve mecha'nism comprising a perforated body member,

conduits connecting each of said perforations with a section of the dispersing member, an

' apertured disk positioned to-move over said perforated portion of the valve mechanism and means for rotating said disk to selective- 1y supply a cooling medium to the sections of said member, the aperture in the disk bemg V-shaped so that the flow of cooling medium to any section may be gradually terminated. v I Y V =5. Acentrifugal casting apparatus comprising a rotatable mold, a pouring trough, a cooling system for said mold, comprising asectional cooling member, conduit means" for supplying a cooling medium to said memher, and a valve positioned in'said conduits, nieans adapted to be operated for successive- 1y admitting a codlingmedium to adjacent sections of the cooling member at a predetermined relationship to the deposition. of molten. metal within the mold.

' 6. A-cooling system for a rotatable mold, I

comprising a sectional cooling member, individual feed pipes for the sections, a rotary [IIllltlplQ valve communicating with a .cooling medium supply and with each of the feed and means for actuating the valve.

centrifugal casting apparatus com- RIlSlIlg a rotary mold, a pouring trough assocltated therewith, a cooling system for'said. mold includin a fluid dispersing'member,

bafiles mounte therein forming sections, an

independent feed pipe for each section and a;

Valve for progressively supplying successive a.d acent.sectionswith a cooling medium.

A centrifugal casting apparatus comprising alrotary mold, a pourmg trough, a cooling system for the mold comprising a fluid dispersingmember, bafiles therein .mounted forming fluid tight sections, feed pipes for each section, a valve associated with the feed pipes for controlling the flow of fluid therethrough and adapted to be operated for progressively supplying a cooling medium to alhacent sections in a'predetermined relation to'the deposition of molten metal within the mold, and means associated with the trough actuating means for operating the valve.

prising a rotary mold, means for pouring molten'metal in the mold, a cooling system '9. Aflcentrifugal casting apparatus comfor said mold, comprising a sectional cooling member a rotary multiple valve, a feed pipe for eac section communicating with the valve and regulating means for the valve operated by an element actuating the pouring means so that a cooling medium is introduced into the feed pipes progressively at a predetermined rate, and at a certain relationship to the pouring of molten metal within the mold.

10. A centrifugal casting apparatus comprising a rotary mold, a pouring trough, a sectional cooling member adjacent said mold and valve means adapted to be actuated inde pendent of said trough for operating independent sections of the cooling member at a predetermined relationship. 7

11. A centrifugal casting apparatus comprising a rotary mold, a pouring trough, said mold and trough being movable relatively to each other, a cooling member extending the length of the mold, said member having a plurality of cooling sections, valve controlled feed lines for supplying a cooling medium to said sections and means independent of said trough for progressively operating the valves to supply cooling medium to adjacent sections of said member relative to the deposition of metal in said mold.

12. A centrifugal casting apparatus com- Y prising a rotary mold, a pouring trough, a sectional cooling member adjacent said mold, conduits for supplying a cooling medium thereto, a valve for regulating the flow through the conduits, means independent of but synchronized with movement of said trough for progressively operating the valve for cooling. successive adjacent sections of said member, and actuating means for said operating means. r

13. A centrifugal casting apparatus comprising a rotary mold, a pouring trough as-' sociated therewith, a fluiddispersing member positioned above said mold, a plurality of partitions in said member dividing the latter into a plurality of dispersing sections, a cooling medium supplying conduit, a valve having a plurality of individual compartments in communication with the dispersing sections'and means for selectively establishing communication between said conduits and said compartments. I

In testimon whereof I afiix my signature.

F ANK G. OARRINGTON.

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