US1407130A - bowman - Google Patents

Description

G. H. DAVIS AND C. T. BOWMAN.

. WATER COOLED DIE.

APPLICATION msn APRA. 1921.

1,407,130, Patented Feb. 21, 1922.

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UNITED STATESv PATENT OFFIC.

GEORGE Hownnrr DAvIs AND CHARLES r. BowMAN, or oRANGE, NEW JERSEY AssIGNoRs 'ro SAID DAvrs.

WATER-COOLED DIE.

' Application med April 4,

To all whom z't may concern:

IBe it known that we, GEORGE HowLn'rr DAVIS and CHARLES T. BowMAN, citizens of the United States, and residents of Orange,

`molding records are often provided with coolingy means for chilling the matrices after a record has been molded. It .is important that this cooling process be carried on as evenly as possible for if one part of the record is cooled more slowly than the remainder, the process is either delayed until the tardy portion is adequately cooled, or else the record is subject to distortion while being removed from the press.

It is common practice to employ water jackets for chilling the bed plates; but those heretofore used have failed to chill the records as evenly as is desirable. `This is due to the diiliculty yin regulating the ow of water through the jacket. If the jacket passages are too large, the water will short-circuit, {iowing directly from inlet to outlet and leaving relatively stagnant eddies which rapidly hea-tup and lose their cooling properties. lf the water is conducted through a single confined channel extending throughout the plate surface, it will become so hot before leaving the j jacket that the portion of the matrix yabove the end of the channel will be cooled much more slowly than the remainder. On

Qthe other hand, jackets in which water passes through a plurality of passages connected to a common supply and discharge have not Vheretofore functioned properly, since the The result has been that the rate of flow in! the various passages varied materially, re-y sulting in uneven cooling of the record. lny seme eases, there may even be a return aow' la Specification of Letters Patent. Patented' Feb 21, 1922.

1921. Serial No. 458,604.

some passages, owing to a Siphon action by the water lowingralong other passages where the resistance is less or the initial pressure greater. The inevitable result of vunequal flow in the various passages is obviously un even cooling of the record.

A primary'object of our invention is to produce a water jacket for the purpose indicated with a plurality of water passages c011- nected to a common source, so arranged that a relatively even flow in all of the passages may be obtained.

A further object is to provide'a construction in which the flow in each passage may be accurately predetermined, so as to be commensurate to the length and area. of the passage, producing equal cooling efl'ect in all the passages. i

Another object is to shorten the time necessary for cooling records, by increasing the amount of water passing through the entire jacket in a given time without sacrificing evenness of distribution.

@ther objects and advantages will be apparent from the following description, taken in connection with the accompanying drawings, in which:

Figure 1 is a plan view of a bed plate, parts being broken away,

Figure 2 is a section on line 2-2 of. lFiofure 1, and.

Figure `3 is a Section on line 3-3`of Figure 1. l j

The bed plate l() is of a common type, being a substantially integral structure adapted to be mounted on the press head,

as by screws passing through the holes 11. The central portion of the face orupper side of the bed plate is formed with the usual table 12 upon which the matrix is mounted, and may have the usual annular seat 13 for the matrix clamping ring. However, any type of bed plate face may be employed without substantially .j affecting our invention. Beneath the table 12 we form a number of channels in the bed plate running generally from the inlet 14 to the outlet 15. In order to obtain a maximum flow of water beneath table 12, we provide channels which branch laterally from the inlet 14. the branches traveling preferably in an vapproximately semi-circular path at op posite sides of the center of the table, and meeting again adjacent outlet 15. Evidently the exact conteur of these paths may be passage located adjacent the plug...

varied substantially; but we have found it both convenient for construction purposes and eliicient in operation to.y employ complementary semi-circular passages 16 having opposed inlets and outlets.

In this construction, however, difficultyhas been experienced in obtaining an even How of water in allof the paths. n particular, the water has a very strong tendency to short-circuit through the shorter paths near the center of the jacket, a tendency which may either reduce the flow in thev outer passages, or in eXtreme cases actually produce a return flow in those passages through thesiphon action heretofore alluded to. This is the case where all of the passages are connected more or less directly to the inlet 14.

We have found that this defect is eliminated, and anaccurately regulated how of water may be obtained, by employing what may be termed a distributor, here shown in the form of a pipe 17 connected o inlet 14 and'having, int'urn separate discharge connectionsy with the entrance ends of each of the passages 16. In this way the watei ispositivelyY introduced to each of the passages at a pressure which can be regulated byvarying the size of the discharge apertures inV pipe 17, and any opportunity for back'flow or variation in rate of flow has been found in practice to be substantially eliminated. Obviously the construction of pipe 17, its arrangement and the method of connection to inlet ends of the passages may be varied-quite materially.

A very simpley and` eliicient construction of. this type is disclosed in the drawings, including the pipe 17 tapped at one end into the inlet 14 and extending through the partitionslSbetween passages 16, and fitting snugly into the partitions to prevent material flow between the passageentrances along pipe 17. The discharge holes 19 are tapped atA opposite sides of pipe 17 at the entrance ends of all the passages, so that V'the water is discharged into each passage fromfpip'eY 17 through at least one hole. The inner endof pipe 17 maybe closed as by plug 20, with discharge holes for the inner It will be apparent' that the exact foi-m p of pipe 17 andits method of connection to migljit be oo nsidered'as necessarily requiringV a piercedVV pipe .to feed the passages. v

the passages, particularly its arrangement relative to partitions 18, may be varied. considerably, the important. feature being the'prc'ivision of a separate distribution aperture' for Aeach passage. Furthermore, while the passage entrance ends are shown as directlyffjuxtaposed, our invention is not limited g to this specific construction, which A' simple formof.v common outlet for the V" passages 1'6 is disclosed, consisting of a radial passage 21 through partitions 18, which may be formed by kerfing or boring the Walls, preferably in line with outlet 15. ln the form shown the outlet passage tapers inwardly, so that the resistance to the exit of the water from the various passagesl decreases as the passages grow longer, thereby tending to force more water through the outer long passages than will flow through the short inner passages. This arrangement may be employed independently of the size of the discharge holes 19 in pipe 17, and has been found in actual use to be highly elicient in regulating the rate of flow in the various passages proportionately to their length.

Vhile the construction above described may be embodied in a bed plate in various ways, We have disclosed one type of construction which may be readily manufactured and assembled. With the arrangement shown the under side of the bed plate l() is cut away to form a single deep annularrecess with a central boss 22, the outer and inner walls of the recess being undercut at 23 to assist in for-ming the outer and inner channels y16 respectively. To form the remaininglchannels, We employ an annular channelplate24 uponthe inner face of'which are formed the partitions 18, plate 24beingadaptedto fit snugly against the walls of the annular recess in the bed plate 10, with'the upper faces of the partitions 18 restingagainst the bottom of the recess. Plate 24 may conveniently be held in place by Welding, as indicated at 25, the adjacent walls of the parti' place are well within the. skill ofthe ordi-v nary mechanic. We claim: f 1. In a fluid-cooled press table having a plurality of` separate fluid passages symmetrically arranged at opposite sides vof the table center, said passages having radially aligned opposed entrances adjacent a fluid inlet, a distributing tube extending radially acroy said entrances and having a separate port for dischargingl fluid from the conduit into each passage. Y

2. A fluid-cooled press table having a uid chamber, a plurality of annular partitions dividingsaid chamber into arcuate passages each connected at one side of thechamber to a discharge opening, and a fluid distributinr tube extending across said partitions and provided with a central chamber having a separate discharge port communicating with each passage.

3.' A press table vof the class described, comprisingI a hollow body havingl fluid/ inlet and outlet openings, the hollowinterior'being provided with substantially annularparthe partitions being apertured in line with said inlet opening, a distributing tube connected With said inlet opening and fitting closely in said partition apertures and provided With discharge perforations in line with the channels intersected by said tube, said partitions also being provided with apertures defining a fluid discharge passage in line with said discharge opening.

4. A press table of the class described, comprising a hollow body having fluid inlet and outlet openings, the hollow interior being provided with substantially annular partitions defining a plurality of fluid channels, the partit-ions being apertured in line with said inlet opening, a distributing tube connected with said inlet opening and fitting closely in said partition apertures and provided With discharge perforations in line with the channels intersected by said tube, said partitions also being provided With apertures defining an outwardly expanding fluid discharge passage leading to said discharge opening.

5. A fluid-cooled press table comprising a body portion having a recess in one slde communicating With an inlet and an outlet aperture therein, an inset section adapted to be mounted tightly in said recess and provided With a lurality of flanges fitting snugly against t e Walls of the recess to d1- vide it into a plurality of separate passages extending from the inlet to the outlet, and a fluid distributing element extending across said flanges, said element having a central chamber connected to the inlet and communicating with each passage through a separate discharge port.

Signed at Orange, in the county of Essex and State of New Jersey, this 31st day of March, A. D. 1921.

GEORGE HOWLETT DAVIS. CHARLES T. BOWMAN.

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