US3043317A - Wheel hub cooling arrangement - Google Patents

Description

July l0, 1962 H. H. HuRsEN WHEEL HUB COOLING ARRANGEMENT 4 Sheets-Sheet 1 Filed DeC. l0, 1959 2Q NVENTOR. ace Mzfuzsef. BY Ja f July 10, 1962 H. H. HURSEN 3,043,317

WHEEL HUB COOLING ARRANGEMENT Filed Dec. 1o, 1959 4 sheets-sheet 2 i@ if @5512.

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July 10, 1962 H. H. HuRsl-:N

WHEEL HUB COOLING ARRANGEMENT 4 Sheets-Sheet 3 Filed Dec. l0, 1959 :lig

IN V EN TOR. goma@ #man July 10, 1962 H. H. HURsEN 3,043,317

WHEEL HUB COOLING ARRANGEMENT Filed Dec. lO, 1959 4 Sheets-Sheet. 4

90 IN V EN TOR. %LJz@5s fo/ace M 525025622/ United States Patent O Filed Dec. 10, 1959, Ser. No. 853,635 13 Claims. (Cl. 134-45) This invention relates to the production of annular castings such as cast steel railway car wheels and more particularly to an apparatus for and method of treating such castings to obtain the benets of normalizing without developing undesirable stresses.

According to the invention, it has been discovered that cast ferrous metal wheels, for example, steel wheels haw ing a carbon content not substantially in excess of .75% by weight are imparted with certain desirable physical characteristics, such as resistance to impact and abrasion by a novel heat treatment similar to that commonly known as normalizing. The novel process has proved to be particularly advantageous in connection with cast steel wheels having a carbon content of about .75%. However, it will be understood that the process may be used in connection with other annular ferrous metal castings having any desired metal analyses. In the normalizing treatment the article to be treated is heated above its upper critical temperature range (approximately l400 F. to l500 F.) and then allowed to cool in air at a relatively rapid rate. V

Of course in the case of an annular casting having unequal sections, such as a railway car wheel, this type of heat treatment creates problems of undesirable residual stress conditions in the relatively thin plate sections of the wheel. If the plate section cools more rapidly than the thicker or heavier hub section, the plate section is placed in a condition of radial tension, while if the hub section cools more rapidly than the plate section, the plate section is placed in a condition of radial compression.

In order to insure a relatively uniform rate of contraction of all sections of the wheel, it is essential that all portions of the wheel be cooled at approximately the same rate, at least until the temperature f all of the sections of the wheel are approximately the same and far enough below the critical temperature of the metal so that the crystalline structure and/or contraction of the metal is not materially effected. Thus, because the hub section is heavier and contains a considerably greater quantity of material than the plate section, to effect a uniform or equal cooling rate for the entire wheel it is necessary to remove greater quantities of heat from the hub section than from the remainder of the wheel. In other words, initially lmore units of heat must be removed from the hub section than from the plate section in the early stages of cooling until the temperatures of all portions of the article are approximately equal and far enough below the critical temperature of the metal so that, even though the separate sections will cool further at varying rates depending upon their thickness, the eifect upon contraction of the metal or upon the crystalline structure of the metal will be minimal.

At one ti-me it was thought that the best results were obtained by commencing to subject the hub section of the wheel to a forced cooling before the temperature of the wheel passed below its critical temperature range in order to obtain the desired stress pattern. However, it has been discovered that when the hub forced cooling is started too early, or before the temperature of the wheel has passed below its critical temperature range, the metal 3,043,317 Patented July l0, 1962 develops other undesirable thermostructures such as undue hardening.

This can be eliminated and the same stress patterns produced by waiting to commence the hub forced cooling until after the temperature has passed below the critical temperature range.

Of course to do this creates yet another problem, namely that of speeding up the hub cooling to insure that the plate section will not cool at a faster rate than the hub section.

I have found a way to overcome this problem and thereby obtain the benefits of a delayed forced hub section cooling that is not started until the temperature of the metal has passed below the critical temperature range.

My solution to the problem resides in the provision of a novel hub cooling apparatus which is capable of automatically subjecting the wheel hub to both air and combined air and water spray cooling treatments in sequential stages so as to greatly expedite the nal forced hub cooling operation.

Accordingly, vit is a primary object of the invention to provide an apparatus for and means of equalizing the cooling rate of the hub section to that o'f the plate section of an annular casting by effecting the initial removal of greater quantities of heat from the hub section than 'from the plate section.

A more specic object of the invention is the provision of an improved hub cooling apparatus for automatically subjecting a plurality of annular castings to a sequential treatment of air and water cooling baths.

These and other objects of the invention will be apparent from an examination of the following description and drawings, wherein:

FIGURE l is a perspective view of a wheel hub cooling arrangement embodying features of the invention;

FIGURE 2. is a fragmentary top plan view of a wheel hub cooling arrangement embodying features of the invention;

FIGURES 3 and 4 are front and end elevational views of the structure illustrated in FIGURE 2, taken on lines 3 3 and 4 4, respectively;

FIGURES 5 and 6 are detail end elevational views of portions of the structure illustrated in FIGURE 2, taken on lines 5 5 and 6 6, respectively;

FIGURE 7 is a top plan View of the structure ill-ustrated in FIGURE 6, and

FIGURE 8 is a schematic diagram of an electrical circuit employed in the automatic operation of the device illustrated in the other views.

It will be understood that certain elements have been intentionally omitted from certain views where they are better illustrated in other views.

Referring now to the drawings for a better understanding of the invention, and particularly to FIGURE 2, it will be seen that an endless conveyor of any desired type, indicated generally at l0, may be employed to transport the annular castings 12 (in this case cast steel railway car wheels) from the heat treating `furnaces (not shown) through the hub cooling area.

Wheels l2 each comprise hub and rim sections 14- and i6, respectively, interconnected by a light plate section l which is of relatively thin cross-sectional area compared to that of the heavier hub section. The hub section of each wheel includes an axle hole 19 extending axially through its center.

The wheels are preferably lying on their sides so as to be disposed in a horizontal plane as they pass along conveyor 10 to and through the hub cooling area of the plant. The temperature of the metal in the wheels when they reach the hub cooling area point has preferably passed below the critical temperature range of the metal (approximately l280 F. to l350 E.) and is approximately 100G" F-ll()0 F.

The novel hub cooling device of my invention is indicated generally at 28 and includes a frame 22 which preferably comprises a pair of longitudinally extending horizontal front and rear base members 24 and 26, respectively, interconnected at their ends by a pair of end base horizontal members 27. Extending upwardly from the rear base member 26 at its ends and intermediate its ends are three rear vertical members 28. Extending upwardly from the front base member 24 and in alignment with rear members 28 are three front vertical members 29 which are approximately one half the height of the rear vertical members 28. The upper ends of the front vertical members 29 may be connected to their related rear vertical members 28 intermediate the ends of the latter by three horizontally extending center cross members Sil. Extending upwardly from the upper ends of front vertical members 29 are three inclined members 32 which slope upwardly and rearwardly toward the upper ends of rear vertical members 28. The upper ends of the inclined members 32 may be connected to the upper ends of their related rear vertical members 28 by three horizontally extending relatively short upper cross members 34. Additionally, the upper ends of the rear vertical members 28 may be interconnected by an upper rear longitudinal extending horizontal member 35 while the upper ends of the front vertical members may be interconnected by a pair of longitudinally extending horizontal left and right, as seen from the front, front members 36 and 37, respectively, as best seen in FIGURE 3. On each of the upper cross members there may be mounted a pillow block 38, the purpose of which is hereinafter explained.

Pivotally mounted on the frame 22 is a sprayer assembly, indicated generally at 40, having three tubes 42 which, as best seen in FIGURE 4, are each generally in the form of an inverted U. The tubes are spaced from each other longitudinally of the frame and are rigidly connected to a shaft 43 extending longitudinally of the frame 22 and journalled in the pillow blocks 38. If desired the shaft may be formed of two separate co-axial sections.

As best seen in FIGURE 4, each tube 42 includes a pair of front and rear vertical portions 44 and 45, respectively, interconnected by a horizontal portion 46. The rear portions 45 of the tubes are disposed to extend rearwardly of the `frame 22 so `as to be in vertical alignment with the axle holes 19 of the wheels 12 on the conveyor 10 when the sprayer assemblyris' in its lowered or operating position, and each is provided at its lower or free end with a sprayer nozzle 47 adapted for insertion into wheel axle hole I9. The front vertical portion 44 of the tube 42 may have extending forwardly and downwardly therefrom at a slight angle an inclined connecting section 48 which is provided at its extremity with a connecting lip or ilange 49.

Mounted on the frame 22 is an air manifold 50 comprising a longitudinally extending main tube 52 closed at one end, as Iat 54, and having the other end 56 connected to a source of air, not shown. Tube 52 is disposed to extend ylongitudinally of the frame and may be secured to the front side -of the frame in any manner such as by a plurality of U-bolts 58. Tube 52 has extending upwardly and rearwardly therefrom three connecting tubes 60 which are spaced from each other a predetermined distance so that they are in longitudinal alignment with the three connecting sections 48 of the respective tubes 42. The axes of the manifold connecting tubes are disposed Aat a predetermined angle so that they are in axial alignment with the connecting sections 48 of the tubes 42 when the sprayer assembly 40 is in operating position. Each of the air manifold connecting tubes has at its upper or free end a flange 62 adapted to abuttably engage the flange 49 of the connecting section 48 of the related tube 42 when the sprayer assembly is in a lowered or operating position. The flanges of either or both the tube connecting section 48 and the manifold connecting tube 60 may be provided with a rubber gasket 63 in order to insure a fluid-fit therebetween when they are in abutting engagement.

Shaft 43 may be maintained in proper position relative to pillow blocks 38, so as to insure perfect alignment between the connecting sections 48 of the tubes 42 and the air manifold connecting tubes 60, by means of a pair of collars 64 located inwardly adjacent opposite ends of the shaft.

Movement of the sprayer assembly 40 into and out of operative position may be accomplished by means of a pneumatic cylinder device 66 which includes a housing or cylinder 67 pivotally connected at its lower end as at 68 to a bracket 69 secured to frame upper front member 37. Extending upwardly yfrom housing 68 is a piston rod 7i? which is pivotally connected at '72 to the forward end of an arm 73 the rearward end of which is rigidly secured to shaft 43. Thus, as the cylinder is energized piston rod 7l! moves upwardly causing the forward end of arm 73 to move upwardly and thereby rotate the sprayer assembly 40 in a counterclockwise direction, as seen in FIGURE 4, `to operative position with the nozzles of the tubes being inserted into the axle holes of the hub sections of wheels on the conveyor.

Air may be forced into the main pipe 52 of the air manifold by means of a blower mechanism indicated generally at 7 6, disposed in any convenient location.

In order to automatically stop the ow of air through the air manifold 5G and its connecting tubes 60, when they are not connected to their related tubes 42, as when the sprayer assembly 40 is in non-operative position, main tube 52 of the manifold may be provided near open end 56 with a butterfly valve 78, FIGURE 5, which is actuated by an arm 79A disposed without the main tube andhaving therein a slot 8l) within which is disposed a pin 8l pivotally connecting the arm to the lower end of a control rod 82, the upper end of which is pivotally connected to a bracket 8&5 rigidly secured to and extending outwardly from the connecting section 48 of the `blower tube 42 which is located at the right end of the frame, as seen in FIGURE 2.

Thus, as the tube assembly is moved to its inoperative position with the nozzles withdrawn from the axle holes of the wheels, rod 82 moves downwardly and toward the manifold so that control arm 79 is rotated to close butterfly valve 78 and thereby prevent air from entering the main tube 52 of the manifold.

As an added protection to avoid any possibility of air being blown from the manifold connecting tubes 60` directly onto the wheels an insulating shield 84 may be secured to the rear side of the frame in any desired manner, FIGURE 4, between the frame and the conveyor.

As previously mentioned, because the forced cooling process is not commenced until after the temperature of the wheels has passed below the critical temperature range, it is necessary to hasten the cooling process, so i the cooling device is adapted to spray the axle holes of the wheel hub sections with water as well as with air.

In the apparatus illustrated in the drawings, only two of the tube nozzles, the center and left hand as seen in FIGURES 1 and 2, are equipped to spray water.

The water may be supplied'to the nozzles of these tubes, respectively, by means of a pair of water pipes 86 secured to the tubes in any desired manner (not shown in detail) which have exible connectors 87 connecting them to a main water pipe or water manifold 88 mounted on the frame 22 in any desired manner (not shown in detail) which in turn communicates with a water source (not shown) located nearby.

Although the primary control of water will be described later in the, specification in connection with the operation of the device, as best seen in FIGURES 6 and 7, the tubes supplied with water may be supplied with additional water cut-olf valve arrangements to insure that no water is ejected from the nozzles when the tubes are not in operating position with the nozzles disposed within the axle holes of their related wheels.

Each of the spray nozzles 47 includes an annular flange 89 surrounding a cylindrical downwardly extending spray head 90 which has a plurality of vertically extending slots 92 through which the air and/ or water passes onto the interior surface of the wheel axle holes. The downwardly facing surface of the nozzle ange 89 may be provided with a gasket 94 adapted to eifect a generally fluidtight seal between the nozzle and the upper surface of the wheel hub section which immediately surrounds the axle hole.

The tubes 42 which are equipped for Water supply are each provided with a limit switch 96 mounted on the side of the front vertical portion 44 for mechanical actuation by a lever 98 which is fulcrumed intermediate its ends to a bracket 99 mounted on the horizontal portion 46 of the tube 42. The front end of the lever is abuttably engageable with the switch while the rearward end of the lever is connected to a vertically disposed rod 100 which is slidably mounted in a guide bracket mounted on the rear vertical portion 45 of the tube at a place just above the nozzle. The rod 100l is disposed to extend down through the nozzle ange S9 and gasket 94 so that when the nozzle is inserted into the axle hole of the wheel the upper surface of the wheel will engage the bottom end of the rod moving the rod upwardly. As the rod moves upwardly it causes the lever 98 to rotate in a clockwise direction, as seen in FIGURE 6, and thereby operate the limit switch which in turn opens a valve (not shown) to permit the flow of water into the nozzle. When the sprayer tube assembly is moved out of operating position a spring mechanism (not shown), reverses the switch to close the valve and prevent the ow of water to the nozzle.

.The sequence of operations can best be understood by reference to FIGURE 8 of the drawings which is a schematic diagram of the electrical circuit which controls the automatic operation of the cooling device.

Electric current is supplied through lines 110 from a 440 or 550 volt power source to a three phase induction motor 112 which is used to operate the air blower fan mechanism 76, shown on FIGURE 2 of the drawings. The lines 110 may each include a disconnect switch l10n, a fuse 113, an overload thermal 114, and motor starter contacts 11651. The 440 or 550 volt current of lines 110 may be converted to 110 volts by transformer 1212. Lines L1 and L2 lead from transformer 122 to form the parallel circuit which controls the automatic operation of the cooling device and these lines lnay include fuses 11361.

In order to begin the sequence of operations of the hub cooling device the disconnect switch 11G@ is closed manually and then start button 115 is pushed. This energizes coil 116, in level 3 of the parallel control circuit, which in turn closes the three sets of con-tacts 11641 of the motor circuit to start motor 112. Also it closes contacts 116b in level 3a of the control circuit so as to maintain a circuit to coil 116, after completion of the cycle, until the second push button is pushed to interrupt the circuit continuity,

As a wheel on the conveyor approaches the hub cooling area it trips a limit switch (not shown) which energizes a relay coil (not shown) which in turn closes contacts 126 in level 4 to energize timer clutch solenoids 12S and 130 in levels 4a and 4b, respectively.

As timer clutch solenoid 12S is energized, it, through a mechanical linkage (not shown), closes contacts 128e and 1285 in levels 5 and 7; also as timer clutch solenoid 13? is energized it, through a similar mechanical linkage (not shown), closes contacts 13051 `and 13% in levels 6 and 8, respectively.

The closing of contacts 128a energizes timer motor 134, in level 5, which runs for la pre-determined time. Simultaneously, the closing of contacts 128b will energize an electrically operated air valve 132, which supplies air to the air cylinder device 66, to move the sprayer assembly into operating position with the sprayk nozzle disposed within the axle holes of the related wheels on the conveyor.

The closing of contacts 136e energizes a `similar timer motor 142 which also runs for a pre-determined period of time, of shorter duration than the air cycle of timer motor 134. The closing of contacts 13tlb energizes electrically operated water valves 138 to allow the nozzles in the center and left tubes of FIGURE 3 to function so long as there are wheels in place on the conveyor. If there are wheels in position they will engage rods 196 which will cause levers 98 to pivot land thereby trip limit switches 96 to permit the ow of water through the nozzles. The length of water spray Will be determined by the time setting on timer motor 142.

Also, it will be understood that as lthe sprayer assembly is moved down into operating position or moved up out of operating position, butterfly valve 78 controls the ow of air into main pipe 52 of air manifold 50 as the valve is opened or closed by the previously described action of rod 82 vand control arm 79.

When the sprayer assembly is lowered into operating position limit switch 95 is opened, by the engagement of the arm of air cylinder device 66, and serves to deenergize another circuit (not shown) which in turn controls the wheel conveyor so as to prevent the conveyor from indexing and damaging the cooling device.

After a pre-determined time, yclock motor 142 times out and opens contacts 130a to stop the timer motor 142,

and also opens contacts 13% to stop the Water spray.

Sometime later timer 134 times out and opens contacts 128e: to stop timer motor 134, and also opens controls 128th to de-energize air valve 132 (or reverse the direction of the ow of air therethrough) so as to move the sprayer `assembly back out of operating position.

As the sprayer assembly moves back out of operating position it mechanically closes limit switch 95 which completes the circuit (not shown) to the conveyor control system indicating that the wheels may -be indexed to the next position on the conveyor.

When the lconveyor indexes, another limit switch (not shown) is operated in the conveyor control circuit (not shown) to open contacts 126 in level 4 and de-energize I timer clutch solenoids 128 and 130, thereby permitting the timers to automatically reset to complete the hub cooling cycle.

[l claim:

1. In an larrangement for spraying cooling fluids into the axle holes of the hubs of a plurality of railway car Wheels, the combination of: a frame; a sprayer assembly icomprising a plurality of parallel tubes spaced from each other and secured intermediate their ends to a shaft, said shaft being journalled in the frame for limited pivotal movement about a horizontal axis, each of said tubes having at one end a nozzle for spraying said fluids and at the other end `a substantially radial ilange; a liuid source; a manifold for transmitting said fluid from said liuid source to the respective tubes of said assembly, said manifold including a main tube rigidly secured to said frame and having extending therefrom a plur-ality of spaced manifold tubes disposed in alignment with the tubes of said sprayer assembly; a substantially radial tlange lat the end of each manifold tube, the respective llanges of the sprayer assembly tubes and fluid manifold being adapted to mate and form -abutting iluid tight connections therebetween when the sprayer assembly is pivoted to a certain predetermined position; means `on the frame for pivoting said sprayer assembly; and means for controlling the `supply of tluid to said sprayer assembly.

2. I n an automatic wheel hub cooling arrangement the comblnation of: a frame; a sprayer assembly movably mounted on the frame and including a conduit having at one end thereof a spray nozzle for delivering a cooling fluid to said wheel hub; means to move the sprayer assembly into and out of operative position; conduit means for delivering a cooling fluid to the other end o-f said conduit; said conduit means and the other end of said conduit being releasably abuttable for communication with each other only when said sprayer assembly is in operative position; `and means for controlling the :iiow of tluid through said conduit means responsive to a predetermined movement of said sprayer assembly.

3. An arrangement according to claim 2, wherein said iluid ilow control means includes: a butteriiy type valve disposed within said conduit means and having a control arm disposed without said conduit means; a rod having one end pivotally connected to said conduit and having the other end pivotally connected to said control arm.

4. In a wheel hub cooling arrangement the combination of: a frame; a sprayer assembly pivoted to said frame and including a plurality of conduits each having a spray nozzle carried at one end thereof; conduit means fixed to said frame; a fluid source connected to said conduit means; said sprayer assembly being pivotable into an operative position wherein the spray nozzles are engaged with ,the wheel hub while the ends of the conduits opposite the spray nozzles are engaged with respected conduit means; means for moving said sprayer assembly into and out of operative position; and means responsive to movement of said sprayer assembly into and out of said operative position for automatically controlling the ow of uid into said conduit means and out of said spray nozzle.

5. In an automatic wheel hub cooling arrangement the combination of: la frame; a sprayer assembly moveably mounted on the frame and including a conduit having at one end thereof nozzle means vfor delivering a cooling fluid to said wheel hub; means to move the sprayer assembly into and out of operative position; conduit means for delivering a cooling lluid to said conduit from a fluid source; and means responsive to the movement to the sprayer assembly for controlling the ow of llluid, said flow control means including valve means, a rod slidably mounted in said nozzle means for movement upon contact with said wheel hub, a lever fulcrumed intermediate its ends to said conduit, said lever having one end connected to said valve means and the other end connected to said rod so that upon contact between the nozzle means and the wheel hub, the rod rotates the lever and thereby causes it to operate said valve means.

6. In an automatic hub cooling arrangement for spraying cooling fluids into the axle holes of a plurality of wheels disposed on a conveyor, the combination of: a frame disposed adjacent the conveyor; a sprayer assembly movably mounted on said frame and including a plurality of tubes secured lat spaced interv-als to a shaft which is pivotally mounted on the frame, said tubes each having at one end thereof `a spray nozzle adapted for insertion into said holes; a manifold rigidly mounted on the frame and including a main tube connected to a fluid source and having extending from said main tube a plurality of connecting tubes, said connecting tubes being axially aligned with and abuttably engageable with the other ends of the tubes of said sprayer assembly when the latter is in operative position; means to move said sprayer assembly into and out of operative position; and means to control the ow of fluid through said manifold and said nozzles responsive to said movement.

7. In an lautomatic hub cooling arrangement for spraying cooling fluids into the axle holes of the hubs of a plurality of railway car wheels, the combination of: conveyor means for transporting the wheels in horizontal position; a frame; spray nozzle means mounted on the frame for movement into and out of said axle holes; means for moving said nozzle means into and out of said wheels responsive to the movement of the wheels on the conveyor; conduit means connecting an air source to the nozzle means; conduit means connecting a water source to certain of the nozzle means; means for controlling the ilow of air into said nozzle means responsive to the movement of said nozzle means relative to said wheels; and means responsive to a predetermined movement of said certain nozzle means toward and away from said Wheels for controlling the flow of water into said certain nozzle means.

8. In a wheel hub cooling arrangement the combination of: a sprayer assembly including a plurality of conduits each having a spray nozzle carried at one end thereof; conduit means; a iluid source connected to said conduit means; said sprayer assembly being pivotable into anv operative position wherein the spray nozzles are engaged with `the wheel hub While the ends of the conduits opposite the spray nozzles are engaged with respected conduit means; means for moving said sprayer assembly into and out of operative position; and means responsive to movement of said sprayer assembly into and out of said operative position for `automatically controlling the flow of fluid into said conduit means and out of 'said spray nozzle.

9. In a hub cooling arrangement the combination of: a frame; a sprayer assembly including a plurality of lluid conduits rigidly mounted at spaced intervals on a shaft and having spray nozzles at corresponding ends thereof; means for rotatably mounting the shaft on the frame; a fluid manifold rigidly mounted on the frame, said manifold -having a main conduit closed at one end and having the other end connected to a fluid source, said manifold also including a plurality of connecting conduits extending from said main conduit and `disposed for releasably abuttable connection to the respective conduits of said sprayer assembly when the latter is rotatably moved to operative position;'means to move said sprayer assembly into vand out of operative position; and means for controlling the ow of uid through said manifold and said nozzles responsive to the movement of said sprayer assembly into and out of operative position.

10. Ina device for cooling a plurality of metal castings the combination of: a conveyor line for moving castings which are to be cooled along a given path; a frame alongside and in relatively `close proximity to said conveyor; a cooling lluid sprayer assembly movably mounted on the frame for movement into and out of operative position with said metal castings carried by said conveyor; conduit means carried by the frame for delivering cooling fluid to the sprayer assembly; means for moving the sprayer assembly into and out of operative position; and a releasably abuttable connection means between the conduit means and the sprayer assembly accommodating relative movement therebetween.

ll. A device according to claim l0, land including valve means responsive to movement of the sprayer assembly for preventing the flow of cooling lluid into the conduit means when the sprayer assembly. is not inoperative position.

12. A ldevice according to claim 10, wherein the sprayer assembly includes a plurality of tubes rigidly secured to a shaft which is rotatably mounted on the frame, and wherein the conduit means includes a manifold rigidly secured to the frame `and having a plurality of connections to the respective tubes of the sprayer assembly.

13. An apparatus for cooling a heated casting, comprising a base, a cooling head, means for mounting said cooling head to said base lfor general reciprocal movement into and out of operative engagement with said casting in order to deliver a spray of cooling iluid to said casting, conduit means for delivering said cooling iluid to said cooling head, a plurality of valve means for controlling the flow of cooling uid through said conduit means, `and additional means operatively connected to said valve means -and responsive to predetermined movements of said cooling head toward said heated casting for sequentially actuating said valve means in order to provide a first flow of cooling air yand ya second flow of cooling Water t-o said cooling head for spraying said casting.

References Cited in the tile of this patent UNITED STATES PATENTS 1,858,860 Kurz May 17, 1932 FOREIGN PATENTS 323,598 Switzerland Sept. 30, 1957

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