US1525700A - Casting machine - Google Patents

Description

Feb. 10. 1925.

W. B. SULLIVAN ETAL CASTING MACHINE Filed April 192;

5 Sheets-Sheet .ffzywetonst- 762 Z z'amji daih'uarz Feb. 10. 1925.

1,525,700 w. B. SULLIVAN ET AL CASTING MACHINE Filed April 12, 1.925 5 Sheets-Sheet 3 'll'll W. B. SULLIVAN ET AL CASTING MACHINE Filed April 12, 1923 as a 2 62 a 74 64 Z3 :1 CI 15' 26 26 67 q 1- r l 5 Sheets-Sheet 4.

Inventors.-

f liokrt Jarda'ne Feb. 10. 1925.

W. B. SULLIVAN ET AL CASTING MACHINE Filed April 1923 s Sheets-Sheet 5 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 0 Z fwmmm 1 h% Patented Feb. 10,' 1925 11,525,700 PATENT OFFICE.

WILLIAM B. sULLIvAN AND Rosana JARDINE, or CHICAGO, ILLINOIS, AssIGNoas To men TOOL COMPANY, or CHICAGO, ILLINoIs, a CORPORATION or ILLINoIs.

CASTING MAeIIINE.

Application fi led April 12, 1923. Serial No. 831,567.

To all whom it may concern.

Be it known that we, WILLIAM B. SU LI- VAN and Roman 'JARDINE, citizens of the United States, and, residents of Chicago county of Cook, and State of Illinois, have invented certain new and useful Improvements in Casting Machines, of which the following is a specification, and which are. illustrated in the accompanying drawings, forming a part thereof.

The invention relates to machines for producing cast forms, and especially, though not necessaril as to some of its features, to the casting 0 'forms upon an existing solid rod or element.

The embodiment of the invention herein disclosed is designed for the manufacture of puppet valves, such as are used in internal combustion engines.

The objects of the invention are the organiz'ation of a machine which will be automatic in its operations, in that it brings the elements of the mold into-assembled relation, heats the valve stem or other previously formed partto a proper temperature forsecuring an intimate union with the head or cast form, pours the metal when and only when the stem or other (part is properly heated, separates the mol casting operation and immediately assembles mold elements for a succeeding operation.

These objects are secured in the machine as hereinafter described and as illustrated line 3-3' of Fig. 2;

in the accompanying drawings inwhich Fig. 1 is a plan view of the device, the electric wiring system being shown diagrammatically:

Fig. 2 is a View partly in elevation and mainly in vertical section on the line 2-2' of Fig. 1;

Fig. 3 is a detail sectional view on the Fig. 4 a detail sectionalview on the line 44 of Fig. 2;

Fig. 5 is an inverted detail plan view on the line 5-5 of Fig. 2;

Fig. 6 is a detail section of all the mold elements and associated parts;

Fig. 7 is a detail sectional 'e w of 'a part of the operating mechanism;

Fig. 8 is a detail sectional view of a'circuit breaker;

Fig. 9 is a detail face view of the drag element of one of the molds;

elements after the Fig. 10 is a detail in perspective of the end portion of a valve stem ready for the casting operation; and

Figs. 11, 12 and 13 are details of stein cams and cooperating levers used in the ap- I paratus.

The apparatus organizedas shown in they drawings, for the manufacture of valves, comprises a suitable base plate 15 from which rise a number of standards, as 16, 17

and 18, for supporting various parts of the mechanism.

Upon suitable frame work 19, carried by the standard 18 is mounted the cope element, generally dsi ated by the numeral 20, (Figs. 2 and 3 of the mold, and the crucible 21 for carrying the molten metal.

A revolving table 22 is loosely mounted upon the upper end of a shaft .23 v(Fig. 4) fixed in the standard 17. The table 22 carries a plurality ofseats, shown as four. in number and designated generally in 1 and 5 as A, B, C and D, these seats bei'lg adapted to receive and properly carry the successively cope element.

Each ofthe seats A,.B, C and D com prises a pair of parallel bars 24, 25, having their inner faces under-cut, as shown in Fig.

. 6. Eachof-the drag elements 26 of the mold is a cast/metal block having along one of its sides ribs complementary of and adapted to slidably engage the under-cut faces of the bars 24, 25. 'In its end face each of the drag elements is recessed as shown at 27 in Fig.

3, to provide the proper mold form for the valve head. The body of the drag element is longitudinally and centrally bored to receive'a valve stem 28. The rearward end of this bore is counterbored to accommodates. spring supported seat 29, for a-valve stem, this seat being normally so positioned as to cause the head of the stem to project somewhat beyond the face of the drag. The body of the drag element is also aterally recessed, as shown at 30, to ermit the entry of a contact element 31 and with the valve stem. A table 32, carried by the standard 16 is provided for carrying newly prepared drag elements and to receive these elements as they are successively removed from the machine as the casting operations proceed. i

its engagement The table 22 is advanced by steps, corresponding in number for each rotation to the number of drag seats with which it is provided. After each casting operation the drag is separated from the cope by the turning movement of the table, a new drag being brought into casting position. As the table is turned the operator removes the drag in which a valve has been cast and replaces 1t Valve stem 28 comes into engagement as the mold elements are brought into casting relation, this aperture being bushed with an i insulating material, as shown in Fig. 3. 20

The cope 20 is supported by a block 35, mounted upon, but insulated from the frame member 19. The attachment between the cope and this block is by means of a plurality of pins as 36, 36, fixed to the back plate 37 of the cope, and sliding within suitable recesses in the block, springs as 39. reacting between the plate 37 and the block to hold the cope normally in advanced position. Preferably theplate 37 is insulated from the body of the cope 20 and the recesses in the block 35' for receiving the pins 36 may also be bushed with insulating material, .as

shown in Fig.

When a drag is brought opposite the cope.

' it is moved forwardly in its seat and pressed against the face plate of the cope, forcing the entire cope backwardly somewhat against the resistance of the spring 38, and bringing the end of the valve stem 28 into contact with the terminal 34, the seat 29-fo1r the stem being moved backwardly and its spring insuring a close engagement of the stem with the .terminal. A sprue hole is provided by forming a groove 39 in the face of the drag and leading to the casting chamber.

Vhen the mold elements have thus been brought into proper relation, the terminal 31, preferably of laminated structure. is advanced into the aperture 30 in the drag and into intimate contact with the valve the block'35 is water cooled, being chambia fiom its outer end as shown at 41, a

leading-in tube'42, extending approximately to the bottom of the chamber and a discharge nipple 43 being provided-for carrying off the heated water.

The crucible 21 is located directly above the cope 20 and is provided with a valve. controlled outlet nipple 44, positioned to discharge into the sprue hole 39. A suitable time interval being allowed for the heating of the valve stem, the valve 455 which closes the nipple 44 is raised to permit the out-flow of the necessary quantity of molten metal to form the valve head.

The crucible 21 is replenished with molten metal from time to time and this metal is kept'at proper temperature by means of a suitable gas furnace. For this purpose the crucible is'housed within a casing 46, into which gas is introduced through one or more nipples at 47 (Fig. 1). At 48 there is shown a vent opening in the casing i6 for the escape of the products of con'ibustion.

-The .table 22 is in frictional engagement with a drum49, mounted upon the shaft 23. and which is constantly driven from a motor through atrain of gears, com n'ising a pinion 51 mounted on the shaft of the. motor 50, a gear 52 mount'ed on a countershaft 5'13, a gear H mounted on a shaft 55 journaled in the standard 17 and a bracket 1'7 secured thereto, a beveled pinion 56 carried by the shaft and meshing with a similar pinion 57 fixed to a drum or mementum wheel 58, mounted on the shaft 23 and rigidly attached to the drum 49.

The table 22 is provided with an annular flange 59, fitting upon the periphery of the drum 4.9, and in this flange is formed a series of teeth or indentations 60, which cooperate with a spring advanced holding pawl 61, mounted in a bracket carried by the standard 16. The teeth 60 are so posi- -tioned as to be engaged by the pawl 6L engaged.- The retraction of the pawl 61 is accomplished by means of a slide-rod 62, carried at one end by a bracket 63 formed on the-table 32. and at its opposite end by v the upper end of a lever 64, fulcruined on a shaft 65 carried by brackets 66, supported on the standard 18. The lower end of the lever 64 is in engagement with a cam-slot 67, formed in the disk face of a cant-6S. mounted on the shaft the slot 67 being so shaped, as shown at 69, as to provide for a quick swing of the lever 6% to retract the pawl 61 at the proper time.

A yielding engagement with the rod 62 is provided, and for this purpose the end of the rodis formed into a loop 70 through which extends a pin carof the lever 6a ried by the lever, and a spring advanced head 71 housed within the loop'receives the pressure of the lever for shifting the rod to retract the pawl 61. The spring supporting the head 71 is of greater strength than the spring for advancing the pawl 61. Y

To insure the positive movement of the rod 62 in the opposite direction, a cam wheel 7 2 is mounted upon the shaft 23 between the drums 49-and 58, and pinned to both, this cam having four swells, as 73, for succes sively engaging an arm 74 projecting laterally from the rod 62. The operator may arrest the pawl releasing action of the rod 62 by means of a manually controlled eccentric 75, mounted. on the standard 16 and the drag against the cope an movable into a position to engage the end of the rod. When movement of the rod is thus arrested the swinging of the lever 64 will merely move backwardly the head 71 against the resistance of the supporting spring.

Each of the drag members 26 is provided with a pair of depending lugs 76, 76, which are spaced apart longitudinally as to the member 26. As the drag reaches the position in line with the cope these lugs receive between them the end of a lever 77, which isfulcrumed on the shaft 65, its lower end 00- operating with a race 7 8 formed in the disk face of a cam 79 mounted on the shaft 53. The cam race 78 is so configured that as soon as the drag 26 comes into line with the cope the lever 77 is rocked on its pivot, forcing pushing the latter back against the resistance of'the springs 38, bringing the meeting faces of the drag and cope into line with the end of the valve stem 28.

The contact element 31 preferably takes the form of a long flexible laminated bar, its

rearward end being secured as at 80 to one of the terminals of the secondary coil of a transformer, 80. The forward end of the element 31 is secured within a sleeve 81 which is pivotally carried by an arm 82 fixed on a vertical rock shaft 83 journaled in the frame members. A spring 87 wound helical about the shaft 83 and having one end attached thereto and its opposite end attached to the frame of the machine urges the shaft in the direction to advance the contact element. A crank arm 84 fixed to the shaft carries a roller 85 adaptodfor engagcment by the swell of a cam 68 mounted enclosed, supports and controls the valve 45' tions provides for tiltin this cam being provided with a short swell 96 for rocking the lever. In order that the crucible valve may be open only a sufficient time to permit the discharge of the requisite amount of metal to'just fill the mold cavity, an adjustment is provided in the operating mechanism. As shown, for this purpose, the lever 93 is jointed at its pivotal point and a bolt 97 engageable with a pair of lugs projecting laterally from the two lever secthe/ outer section to permit some lost motion" between it and the hook. By this arrangement the crucible valve may be open during the whole or only a part of the stroke of the lever 93.

The hook 92 is normally positioned beyond the end of the lever 93, a spring 98 reacting between the upper end of the rod 91 and the lever 89 swinging the rod outwardly. As the cam swell 96 approaches the end of the lever 93 an electromagnet 99,

cooperating with an armature 100, mounted machine, diagrammatically shown, comprises the wires 104, 105, connected with the same switch-box and with the terminals of the primary. circuit of thetransformer 80. A normally open switch 106 forms a part of ,this primary circuit, being shown as introduced' into the line This switch isv mounted upon a suitable bracket-107 throu h which the stem of the switch slides. e end of this switch stem is engageable by the swell portion of a cam 108 mounted on the shaft 53. A shunt circuit 109, 110 from'the primary local circuit 104, 105 actuate/s a suitably wound relay 111, controlling the magnet 99. I

The various camsareso timed withreference to the other mechanism of the machine that the following operations occur in order:

Upon the release of the pawl 61 the table 22 is turned through 90, bringing a drag 26 into alignment with the cope 20, the table being then arrested by the engagement of the pawl 61 .with the next tooth 60 in the table flange 59; the lever 77, being 'now' entered between the lugs depending from the positioned drag," moves a; the right (Fig. 2) advancing the drag and forcing the cope baclrwardly against the resistance of the springs38; the shaft 83 is turned to rent through the primary coil of the transbring the 'contact element 31 into engage- -ment withthe valve stem 28 carried by the drag; the switch 106 is closed, sending ourformer 80* and inducing a current of high "amperage in the secondary coil, this current passing through the contact element 31, the valve stem 28, the contact element 34 and the line 40 to the opposite terminal of the secondary'coil of the transformer; the end portion of the valve stem 28 is heated and under the influenceof the spring supporting the seat 29 is caused to bulge laterally,

' taking the shape shown in Fig. current flowing through the shunt circuit 109,110 closes the relay 111, causing the energizing of the magnet 99 which draws the hook 92 underthe end of the lever 93; the lever 93 being rocked opens the valve 45 permitting 'molten metal to flow into the mold cavity to form the valve head; the lever 93 isreleased from the cam swell 96, permitting the I ting the table 22 to turn through 909,;m0v-

ing the drag within which the valve head has been cast and; commencing a new cycle of operation.

While the table 22 is at rest the operator.

removes the used drag and inserts a new one in its place.

The details of the electric circuits are not shown and described as common pratice is followed, it bein necessary only to select a'transforme'rwh ch will provide in the secondary coil the necessary current for heating the valve stem,v and a relay at 111 which will be actuated only when the current'in the secondary circuit is. ample for the urpose named." By the cooperation otsuc properly selected electrical elements the casting operation occurs only when the valve stem is heated sufliciently to insure a perfect union of the cast and wrought metals,

The relay 111 is shown as in 'shu'nt from the local primary circuit. It iiswell known that a relay associated with a transformer f 'urging the stem against the dra with sufmay be connected with either of its circuits,

- its winding being correspondingly varied.

' In the arrangement shown, as the currentbuilds jup'v in the secondary circuit the resistance. in the primary circuit s increased until sufiicient current is diverted to the.

relayito cause its actuation.

' Preferably'tlie machine when organized for the manufacture of valvescomprises the various parts as, and in the forms or equivalent forms, hereinbefore described, though some of theautomatic operations may be provided for n connection with means not strictly automatic. in their actions for performing other steps in. the casting opera-' tion. While a preferred form of construction for a valve casting machine is shown and described, variouschanges in the details may be made without departing from its scope and for the purpose of manufacturing articles other than valves it may be found desirable to organize the apparatus difierently while still including the invention as a whole or as to some of its parts.

We claim as our lnvention: v 1. An automatic valve casting machine com risin in combination a cope a valve stem carrying dra cooperating with the cope to form a mol a container'for molten metal having a valve-closed outlet delivering to the mold cavity, an electric circuit including the cope and a movable terminal for making contact with the carried valve stem of the following elements arranged to act successively in the order named, means for bringing the cope and drag into assembled relation, means for moving the named terminal into engagement with the carried stem, means-for closing the circuit, means controlled by the electric circuit for opening the container valve, and means for separating'the drag and cope.

2. An, automatic valve casting machine comprising, in combination, a cope, a plurality of drags, each adapted to carry a said drags into cooperative relation with "said cope, and means for pouring molten f metal into each of the molds while in said cooperative relation; r

3. An automatic valve casting machme COmPIISIII rality of d rags each adapted to carry a valve stem, means for successively bringing saiddrags into coo e'rative relation with said cope, means for eating the valve stem while the drag is in contact with said cope, and 'means for pouring molten metal into the cavity and a stem-carrying bore leading into the cavityQan electric circuit including the drag and a terminal engageable withthe stem heldwithin the bore, and means for ficient pressure to distort the en portion of the stem laterally.

vvalve stem, means for successively bringing in combination, a cope, a plu- Q 5.- An automatic valve casting machine,

comprisingfln combination, a cope, a drag adapted to carry a valve stem, means for bringing the cope and drag-into cooperative relation whereby one end of the valve stem engages the cope, an electric circuit including a movable electrode and'the cope,

means for moving the electrode into con-- tact with the valve stem within the drag for closing the circuit whereby said'valve stem, means for pouring molten metal uponthe end of the heated stem, and automatic means for preventing the pouring operation before the stem is heated to a predetermined degree.

7. An automatic valve casting machine comprising, 1n combination, a cope, a revoluble table, a plurality of drags slidably mounted upon said table and each adapted to carry a valve stem, means for successively presenting the drags to the cope,

' means for heating one end of the valve stem, a melting furnace having a valx e opening directly above the heated end, means for o ening the valve when the stem has been su ciently heated whereby molten metal is poured upon the heated stem.

8. In an automatic valve casting machine, in combinatlon, a cope, a revoluble table,

a plurality of drags slidably mounted up-.

on said table means for intermittently turningthe table whereby the drags are successively brought into alignment with the cope, means for advancing the aligned drag into contact with the cope, a melting furnace having a valved outlet directly above the contacting drag, and means-for opening the valve for pouring molten metal into the mold.

9. In an automatic valve casting machine, in combination, a metallic cope having afront and rear ortion insulated from each other, an extension of the rear portion projecting through an aperture in the front portion,- a drag adapted to carry a valve stem and having a side aperture therein to permit access to the stem, means for normally advancing the stern beyond the end of the drag, means for advancing the drag into contact with the cope whereby the projecting end of the valve stem engages the extension of rear cope portion, an electric circuit including the rear cope portion,

means for completing the circuit through the valve stemv for heating the same, and means for pouring molten metal upon the end of the heated valve stem.

I throu h an aperture in the front portion,a drag aving a longitudinal bore a'dapted'to contain a valve stem and a lateral opening] with the cope, a cam operated lever for adto permit access to such stem and a pouring groove 'at its front end, resilient means adapted to normally project the end of said valve stem beyond the grooved end of the drag, means for advancing the drag into contact with the cope whereby the valve ed end of said valve stem.

11. In an automatic 'valve casting machine, in combination, a metallic cope iorming one terminal of an electric circuit, a drag slidably supported in alignment therewith, and having a bore adapted to receive a valvestem, a lateral opening topermit access to said stem, a hollowed out portion and a groove communicating therewith at its forward end; means for advancing said drag into cooperative relation with the cope, means for completing the electric circuit through the valve stem for heating the same, a metal container having an outlet communicating with the groove, a valve in such outlet, a revolving cam anda lever actuated thereby for operating said outlet valve.

12. In an automatic valve casting machine, in combination, a metallic cope forming one terminal of an electric circuit, a drag slidably supported in alignment therewith and having a bore adapted to receive a valve stem, a lateral opening in said mold adapted to allow access to said stem, a recessed front end and a pouring groove communicating with the recess at the forward end of the drag, means for advancing the drag into cooperative relation with the cope, means for completing said electric circuit through the valve stem for heating the same, a metal container having an outlet directly above the pouring groove, a valve in the outlet, a revolving cam, a lever operated thereby, a swinging bar operatively associatedwith-said outlet valve and having a hooked end adapted to be swung into enagement with the end of the cam operated ever, and means actuated by the closing of the electric circuit for swinging the bar into cooperative relation with said cam operated lever, e

13. In an automatic valve casting machine, in combination, a rotating power operated shaft carrying a plurality of cams, a revoluble table having slidably mounted thereon aplurality of drags each adapted to carry a valve stem, a metallic cope forming one terminal of an electric circuit, means for intermittently rotating the table to bring the drags successively into alignment vancing one of the drags into contact With the cope, a reclprocable electrode carried upon a spindle, a cam carried by the shaft adapted to intermittently oscillate the spindle for advancing the electrode into contact with the valve stem carried by the contacting drag, thereby closing theelectric circuit and heating the stem, a metal container having an outlet, and an outlet valve,

- a swinging rod operatively associated with the outlet valve and having a hooked end, a second cam .operated pivoted lever and an electromagnet actuated on the closing of the stem heating circuit adapted to attract theswinging rod whereby its hooked end is engaged bythe end of the lastnamed lever.

' 14. An automatic valve casting machine, incombination, a mold comprising a stationary cope and a: movable valve stem carrying drag, an electric circuit including the carrier stem and the cope. a valve controlled metal container for delivering metal to the mold, and automatic means for assembling the mold elements, for closing the circuit, and for opening the container valve.

last mentioned means being operative only upon the 'closing of the circuit through the v valve stem. 7

16. A casting machine comprising in com- .bination, a suitable frame, a cope mounted.

on the frame, a drag adapted to carry an element upon which a casting is to be formed, ways upon which the drag may be moved -intoassembled relation with the cope, an

electric circuit adapted to include the drag carried element, a. molten metal container delivering to the mold cavity, and means controlled by the named circuit for regulat:

ing the discharge of the molten metal.

. WILLIAM B. SULLIVAN.

ROBERT JARDINE.

Images