US1688728A - Means for supporting cores in molds in the manufacture of tubular castings - Google Patents

Description

- Oct. 23, 1928. 1,688,728

J. R. MCWANE MEANS FOR SUPPORTING comss IN moms IN THE mnumc'runm OF TUBULAR CASTINGS Filed Dec. 12, 1924 2 SheetsSheet 1 Hamil I 73 WW- T 53555 0 WI NE a iapwfi ATTORNEY Oct. 23, 1928.

U M WANE MEANS FOR SUPPORTING CORES IN MOLDS IN THE MANUFACTURE OF TUBULAR CASTINGS Filed Dec. 12, 1924 2 Sheets-Sheet 2 mvem-on mas-i5. jfdnkizd,

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ATTORNEY Cir Patented on. as, was.

UNITED STATES means PATENT ewes.

JAMES MG'W'ANE, OF BIRMINGHAM, ALABAMA.

CASTINGS. 1

MEANS FOR SUPPORTING CUR ES IN MOLDS IN THE MANUFACTURE OF TUB'UI il-lfi Application filed December 12, 19:24. Serial No. 755,511.

This invention relates to means for supporting cores in molds for elongated tubular castings."

An object is to provide supports tor cores otelongated form, such as are used in the manufacture of cast iron pipe or other tubular castings,so as to prevent the core from sanging at the intermediate portion thereof, due to the weight of the core bar, or from. moving upwardly or laterally under the influence of the molten metal flowing into the mold, during the step of pouring.

Another object to provide supporting means for this purpose which may be readily applied in position. I

A further object is to provide support ng means which will not interfere w th the separation of the cope from the drag, atter casting, and which may readily hedrawn from the sand of the drag section together with the finished pipe or other casting.

A full and complete understanding of the invention may be obtained from a consideration of the following detailed description, taken in connection with tl accon'ipanying drawings forming a part of this specification,

it being understood that while the drawil'igs show a practical term of the invention, the latter is not to he confined to strict COfltOiHilt] with the showing thereot, but may be ch anged or modified, so long as such changes or modifications mark no material departure iron the salient features of the invention, as pointed out in the appended claims.

In the drawings, in which similar reference (irlraracters designate corresponding parts throughout the several figures 2" Figure 1 is a plan view of a low section of a double pipe flash, the stone hav in the cores in position, the improved means for preventing: lateral movement of the cores being shown in plan;

Figure 2 is a side elevation of the complete flask and showing portions of the means for preventing vertical movement of the cores;

Figure 3 is an enlarged, transverse sectional view through the flask;

Figure l is a fragmentary vertical, longitudinal section, drawn on the samescale as Figure 3; v Figures 5, 6 and 7 are detail views ofthe bracket for surmortinp; the means for preventing lateral movement of the cores;

Figure 8 is a detail perspective view o'f'one ot the pins used for preventing vertical movement;

Figure 9 is a transverse sectional view oil the cast pipe or the like, after-the several supporting pins have been rei'noved there-- from, shown ready for reweldin Figure 10 is a view illustrative or the 1X1Zt11-- lar castings, in the horizontal method of casting the same, it is rdina rily necessary to insert Chaplets around the core, at intermediate point-s along its length to prevent the same from sagging 'or moving in any direction, and such. Chaplets, whichare merely pieces of metal, are necessarily left embedded in the pipe and are impossible to ren1ove,,often causing leakage especially in the case of high pressure ater pipe. Reference is made in this connection to my prior Patents, Nos. 1. 186578 and 1,491.,517. v l"'hc improved means for supporting; the core herein shown and described act in the same manneras the chaplets, to prevent vertical or lateral movement of the intermediate portions of the core, but said means may be withdrawn from contact with the finished pipe andthe resultant holes may be readily welded to maltethe pipe water-tight, even underhighpressure. v I

in the drawingsthere is shown a flash tor the manufacture of cast iron pipe according tothe horizontal method or"; casting, and comprising a lower or drag section 1, and an upper or cope section 2 adapted to be superimposed thereon; the two sections having complemen tary lugs 2 tor the reception of suitable clampinp means to lock the sections together.

The drag section is adapted to have the halt ot a mold 3 formed in sand therein, and the other h all otthe mold t is formed in theupper or cope section, suitable, transv rsely disposed gates 5 formed in the sand in the drag communicating with a. central longitudinal channel 5 therem to pass the molten metal at different points along; the length or" they ,mold into the same. The sand in the cope section is also formed in a series of sprue holes 6, communicating; with I said channel 5, and adapted to pass the molten metal ladle capable of carrying sufficient metal for pouring several flasks and of pouring the exposed ends of the core bars serving to sup port the same but, because of the elongated nature of the cores for forming pipe, especial- .15 of the smaller diameters of pipe, the same tend to sag of their own weight at the intermediate portion thereof, and also tend to be floated by the inflowing molten metal, or to be forced outwardly, as in a double flask for forming two pipes at once, by reason of the course of the metal through the lateral gates 5; and it becomes necessary to guard against such movement of the core by some such means as Chaplets or the more advantageous means herein employed. v

At a central point of the lengths thereof, the cope and drag sections 1 and 2 are provided with openings 9 formed in the walls of the same, and in vertical alininent with the longitudinal axes of the cores 7. Flanking each of these openings are side walls or flanges 10 arranged flush with the top and bottom edges of the cope and drag respectively and having alined openings constituting wedge seats 11, for the reception of wedges 12 of ordinary tapered form. See Fig. 4.

Pins 13' (Fig. 8) formed of suitable metal, and having their outer portionssubstantially square in cross section to slidably fit the said openings 9, are adapted to be inserted therein and held by said wedges 12. The inner end portions 14 of the pins are somewhat reduced and round in cross section, the same having a slight taper towards their inner ends, where they are provided with more abruptly tapered terminals 15.

The outer ends of the square portion of each pin is reduced to form a shoulder 16, which is slightly inclined, as shown in Figures 4 and 8, so that by gently driving the wedge in the proper direction a longitudinal movement will be imparted to the pin to cause the same to move inwardly toward the core 7.

Each core bar 8 is provided throughout its length with the usual vent holes and at the center thereof each is equipped with an upper, lower and outer retaining lug 15 of tapered and dove-tailed form as shown in Figures 3 and 4, said taper extending longitudinally of the core bar. ton or block 16", having a sutable tapered and dove-tailed seat on its underside, is adapted to be slipped onto the lug 15 to detachably hold the same in place so that when the core is being pulled from the finished pipe, after the latter is allowed to cool the buttons or A metallic butblocks 16 will be freed from the lugs, and the core bar will slip more readily through the hardened and burned sand within the pipe and become freed. therefrom, the blocks falling out of the pipe along with the sand when the said pipe.is tilted and shaken to loosen the sand. This is substantially the same as disclosed in my former Patent No. 1,486,778.

The inner ends of the upper and lower pins 13 are adapted to bear against the outer faces of the blocks 16 which are exactly flush with the outer surface of the sand core 7, so that the continuity thereof is not broken,

smaller diameter than the pins 13. It has been found in practice that an ordinary wire nail of proper dimensions to give t e required strength is a practical and economical form of such a pin, for the purpose of preventing outward movement of the core when the molten metal is poured.

Attached to each side of the lower or drag section is a bracket 19 (Fig. 3) held in position by bolts 20 at the center of the flask, and adapted to be overhung by the outer ends or heads of the pins or nails 18, the said bracket having a shelf or horizontal outwardly-extending plate 21. As best shown in Figs. 5, 6 and 7, lug 22 is formed on the upper face of the shelf 21, and adjacent to the in ner edge of the same, said lug having a trans verse groove 23 for the exposed end of the 7 pin or nail to rest in, in addition to the aforesaid groove 17 in the edge of the drag sec tion. The shelf is further provided at its outer or free'edge with spaced lugs 24, ar ranged at either side of the end of the pin or nail and having their inner faces undercut, as at 25 to provide a seat for a tapered wedge 26, having a correspondingly beveled edge and an inner straight edge to abut against the head of the pin or nail 18, and force the same inwardly against the outer blocks 16*. Each pin or nail 18 also has its inner end tapered where traversing the casting space, similarly to the pins 13 so that they may be readily withdrawn from their embedded connections with the finished pipe, after the latter is partially cool.

In assembling the mold and the core supporting means, the drag section 1 is first placed upon the molding machine in an inverted position, or similarly to-the normal position of the cope section, that is to say, with law the normal bottom of the drag uppermost.

The lower 13 are then placed in position through the openings 9 in the drag section,

with the tapered ends 15 fitting in seats or depressions formed in thetubular pattern of the molding machine, and the lower wedges 12 are loosely placed in position to hold sa1d pins. The sand is now rammed in around the pattern and around the pins 13, after which the patterns are lowered from the sand through the usual stripping plate, leaving the halt 3 of the mold and the gates 5 and channel 5 formed therein, the sand serving to hold the pins 13 in proper position. The drag is then inverted and placed upon the casting floor, as shown in Figure 3. with the tapered ends 15 of the pins extending substantially the proper distance into the halt-round mold. lVhile the upper or cope section 2 is being operated on in the same manner to storm the half at of the mold, and the sprue holes 6 therein, the cores 7 with the blocks 16 in place are positioned in the drag section, the lowermost block 16 contacting with the tapered endof thelower pin Now the outer or side pins or nails 18 are placed in the grooves 17 and 9-3 of the drag section, the sand being carefully removed or depressed for the purpose so that none may fall in the casting space, the inner tapered end of Sll ltl pin or nail. abutting against the outer blocirs 16 and the wedges 26 are then loosely intro duced in their seats. The cope, with the pins 13 in position therein, is now brought and placed carefully over the core and the drag, with the edges thereof in exact alinement with the drag, and the groove 17 therein fitting over and receiving the-upper portion of the side pins or nails, and the upper pins 13 resting on the upper pass 16, whereupon the aforesaid clamping means are applied to the several pairs of complementary lugs 2 to hold the flask together. he wedges 1F and 26 are then carefully driven. in to tighten the contact between the several pins and blocks on the corebar, and it will be seen that neither sagging nor the action of the intlowingn'ietal will act to depress, float or force the core bars to move outwardly.

' After the pouring of the metal, the casting is allowed to partially cool, when the said clamps are knocked off and the cope section is lifted oil, the upper pins 13 reaoily passing down through the openings 9 thereoi' and.

through the sand of the Cops, while being held by their connections with the pipe where the tapered ends 15 traverse the same. T he pipe, with the core and core bar therein, is then lifted off of the drag, carrying therewith the upper pins 13 the lower pins 13 which readily pass through the openings 9 in the drag, and through the sand of the drag, and also carrying the pins or nails 18, the wedges 26 having been loosened. The several pins may easily be removed by hand "from their attachments to the pipe, thus leaving the pipe as shown at 28 in Figure 9, with the several 29 therein at the center onlyioi preheat, to the proper temperature, the area to be welded,.to prevent undue strains in the pipe when cooling after the welding, ithaving been learned from experience that welding the pipe, without pre-hcating the same at the area to'he welded, results in a weakening of the pipe, when shrinkage takes placel The pro-heating obviates this disadvantage by giving a more uniform temperature throughout the body of the pipe, and consequently more uniform cooling. After passing over the tire, the preheated pipes are rolled along to an. operator standing between. the tracks of the runway and in an advantageous position to weld the holes at the centers thereof. After a pipe is welded, the operator may sit in a seat or swing 31 supported from overhead, and by raising his legs, the welded pipe may pass beneath him to be tested and coated, the operator immediately standing again to treat the next pipe. 1 V

From the foregoingit willv be seen that a simple, cheap and etlicient means has been provided for supporting the core bars of molds for making elongated castings without the necessity for using chaplets, said means eillcctually preventing any movement of the core within the mold during the pouring of the metal.

What is claimed is r 1. The combination of a pipe mold having a core bar, and means for preventing deflec' tion of the core bar in the pipe mold, comprising a pin having a reduced inner end, said pin being adapted to be inserted through the flash to bear on the core bar,-the said re duced end traversing the mold. space to be removably embedded in the pipe but not to enter the bore of the pipe and means for locking the pin to maintain its contact with the core bar.

2. Means for supporting an elongated core bar, comprising at least three pins adapted to pass through lateral openings in the flash sections and to bear on the core bar, and

means for locking the pins in such engagement to hold the core bar against upward, downward or lateral movement due to the effects of the inflowin metal or to sagging 01" the core.

3. Means for supporting core bars, comprising upper pins adapted to be passed downwardly through the cope section of the flask to bear on the core bar, means for locking said pins to prevent said bar from floating on the inflowing metal, lower pins adapted to be passed upwardly through the drag section to hear beneath the core bar, and means for locking said lower pins to prevent said bar from sagging under its own Weight;

4. Means for supporting core bars, comprising upper pins adapted to be passed downwardly through the cope section of the flask to bear on the core bar, means for look ing said pins to prevent said bar from floating on the inflowing metal, lower pins adapted to be passed upwardly through the drag section to bear beneath the core bar, means for locking said pins to prevent said bar from sagging under its own weight, side pins adapted to be passed inwardly between the cope and drag sections to bear on the outer sides of the core bar, and means for locking said pins to prevent outward movement of the core bar caused by the metal flowing from the inner sides.

5. A flask for making cast iron pipe and other tubular articles comprising, in combination, a cope; a drag; a core including a core bar mounted on the flask coaXia-lly with the mold provided on the cope and drag; and means to prevent side deflection of the core arising during pouring of the metal, said means comprising a metallic member which enters the flask laterally thereof and is in contact at its inner end with the core bar; and a locking device to hold said member securely in such contact; said metallic member being of relatively small diameter where traversing the molding space so that it may be removed from the casting before it cools without leaving a large hole in the casting.

6. Means for supporting cores for tubular castings in flasks having cope and drag sections provided with openings above and below the core and with registering grooves in their longitudinal meeting edges, wedge seats carried by the sections at the openings and grooves, vertical, oppositely disposed pins passing through the openings and bearing on the core bar to prevent vertical movement thereof, horizontally disposed pins passing through the grooves and bearing on the core bar to prevent outward movement thereof, and wedges adapted to be driven into the seats against the pins to lock the same in position.

7. Means for supporting cores for tubular castings in flasks having cope and drag sections provided with openings above and below the core and with registering grooves in their longitudinal meeting edges, wedge seats carried by the sections at the openings'and grooves, vertical, oppositely dis osed pins passing through the openings and earing on the core bar to prevent vertical movement thereof, horizontally disposed pins passing through the grooves and bearing on the core bar to prevent outward movement thereof, and wedges adapted to be driven into the seats against the pins to lock the same in position, said vertical and horizontal pins having tapered inner ends where traversing the casting space to be removably embedded in the casting.

8. Means for preventing upward, down ward or lateral movement of the intermediate portions of elongated cores in molds, comprising vertical and horizontal pins having shoulders adapted to passthrough openings in the flask sections and hear on blocks removably carried by the core bar, said blocks having their outer faces flush with the outer surface of the core sand, the outer ends of said pins being exposed exterior of the flask sections, wedge seats provided on the flask sections adjacent to the openings, wedges adapted to be driven into the seats and against the shoulders of the pins to hold the same against the flask, said pins having their inner ends tapered where traversing the cast ing space and bearing on said blocks so as'to be readily removed from the casting for finall welding the holes.

9. cans for preventing transverse movement of the intermediate portions of cores in cast iron pipe molds, comprising pins adapt ed to pass through openings in the flask sections and to hear on the top, bottom and side of the core bar, said pins having tapered inner ends where traversing the space for the molten metal and bearing on the core bar and having exposed outer ends, wedges for holding the top and bottom pins in engagement, a bracket adapted to be bolted to the drag section of the flask and having spaced lugs provided with undercut faces opposite the exposed end of the side pin, and a wedge having a beveled edge and adapted to be driven in between the lugs and said pin to hold the same against the core bar.

In testimony, that I claim the foregoing as my own, I have hereto aflixed my signature;

JAMES R. MolVANE.

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