US1578580A - Die-casting machine - Google Patents

Description

1 H a 0 S a mn wn h No N m M ml zm w NW 7 A E CARLSON DIE CASTING MACHINE Original Filed Sept. 11, .1922

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E. CARLSON DIE CASTING MACHINE Original Filed Sept. 11, 1922 6 sheets-Sheet 5 I AWE/V702 Eric C'arZson Win/E55.

March 30 1926.

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ATTORNEYS.

EfcARLsoN ,DIE CASTING MACHINE March 30 1926.

Original Fild Sept. 11, 1922 6 Sheets-Sheet 6 [NVE/VTUH. Eric Carlson fix QM; 13w;

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Patented Mar. 30,1926. 1

v UNITED STATE-S,

PATENT OFFICE.

ERIC CARLSO'N, OF CHIGAGO, ILLINOIS, -ASSIGNOB TO STEWART MANUFACTURING CORPOM'IIQH, OF CHICAGQ, ILLINOIS, A CORPORATION DELAWARE.

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" I Application filed September 11, 1922, Serial No. 587,264. Renewed December 7, 1925.

To all whom it may concern: Be it known that. I, Emo-CAnLsoN, a citizen" of the United States, residing in the city of Chicago, in the county of Cook anded for as rapid operation as the size of the.

castings and the time necessarily required for their cooling in the mold will permlt; and also adapted to be operated by a single operator controlling all the movements of the machine which are not entirely automatic. It consists in the elements and features of construction shown and described as indicated in the claims.

In the drawings:- 1 I I Figure 1 is a front side elevation of a machine embodying this invention, the parts being in the position occupied when thedie is open-and the machine at 'rest, certain parts being broken away as shown-indotted line for disclosing operating parts otherwise incompletely visible. 7

Figure 2 is a. top planviewpf thesarne with the parts in the same position as F1g ure 1, certain. parts broken away-shown n dotted line fordisclosing parts underneath them.

Figure 3 is a* vertical section at theline 3-3 on Figures 2 and 4, but with the parts in the position occupied when the die is closed for casting. I

' Figure 4 is a left hand end elevationofthe machine with certain parts removedto in order to understand the movements.

Figure 5is a partlysectional plan View] 'sectio'ns' beingv made at the lineh-aon Figure/i, axial withrespect to the power shaft and at 55' on Figure 1, the metal J pots and supports and operating connections being removed.

disclose others which are required to be seen the; latter about t p position'is reached and the die is-ready to no Figure 6 is a detail section at the line' 6-6 on Figure 1. v

Figure 7 is a section at the line 7-7 on Figure 4. j Figure 8 is a top plan view of the die- .carrie'r frame and moving parts thereon without the fluid pressure cylinders and their supports.

Figure 9 is a side elevation of saidframe including the cylinder supports stripped of mechanism.

-Figure 10 is on Figure 5. v Figure 11 is a section at the line 11 11 on Figure 4:.

a section at the line 10-10 Figure 12 is a detail plan view of the lever-locking device. I

Figure 13 is a detail section at the line 13-13 on Figure 1 on an enlarged scale.

Figure 14 is a section on Figure 13. a

In the machine shown inthe metal pot is fixed and the die is'advanced and withdrawn for receiving the metal and discharging the casting. The 0t is eleat the linel-l 'vated and discharges downward y into the die The latter with'all its parts and cores and operating connections is mounted for moving horizontally by positioningthe die under the pot,"to he then upiifted to register its inlet with the pot discharge nipple.

The two parts of the die are moved rela tively for opening and cioeing in the same direction'in which the die as a whole and all'its parts and operating connections move for entering under and withdrawing from under the pot; and the closirfif and openin oi: the die occurs inethe sai enterin an withdrawing movement, "by virtue o different speed of movement of the two die members; that is, the two die members bein positioned one behind the other in the path of advance ,for. entering under the pot, the rear or follower member moves more rapid- 15* than the leadingi -member. and overtakes e time the registering e uplifted in 'order to'register- "with the pot nipple.

' The cores and the immediate-mechanical" drawings the for eratm rather than the other; may be regarded as the main die member. The cores are thrust in and withdrawn by-fiuid pressure, separate before starting the machine for the other the metal therein, the pot being tightly movements and operations The dischar e of the metal from the die is controlled y a valve at the discharge nipple; and said discharge is forced by fluid pressure admitting to the pot above closed except as to the fluid pressure admisthe opening of the metal dischai sion and metal discharge 'port. The valve which controls the admission offluid'pressure to the "ot is operated by another, cam on said sha t, so that the time relation of i e valve and the admimion of pressure to causing discharge is predetermined absolutel and as desired by the adjustment of the cams on theshaft. The power shaft has-cams which operate the connections for giving, the two die members their movements -\respec tively, for closing in advancing under the t and opening or withdrawing fronLnn er the pot; and it has also other cams for lifting the die structure bodily to register the die inlet with the pot discharge nipple at the limit of the closing and advancing movement of the die.

The adjustment of the several cams on the'shaft provides for proper relative time ing of the several operations to cause them to occur in the following order ened the manual valve for admitting pressure to the cylinders for operating the cores, operates t e control lever for supporting the ma chine. JThe rotation of the power shaft then causes it to perform the several functions in the following order a First :-The die moving cam starts both the die members moving toward the pot,

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the follower 'moving more rapidly than theleader and overtaking the latter when .the metal inlet of the die, which is in the leadeir, is in position directly. under the pot mp e. v v

econd:-The' lifting cam lifts the die v bodily to re ister its inlet with the pot nip- Third :--The pTe and hol s it snugly t'hereagainst; pot-valveoperating cam opensthe discharge valve 0 the pot; and next at a very brief interval or simultaneously, the fluid-pressure controlling cam which controls admission of pressure to the pot for discharge of the metal to the die,

opens the pressure controlling valve andv almost immediately passes the dwell of the ammo cam and Changsha valve opens the exhaustport relieving the pressure of the pot.

Fourth :The pressure being ofi the pot,

Fifth :-The die-lifting cam-has at this time, passed its dwell, and is in its return course causing the die to be lowered away from the pot. 1

Sixth :-The cams which operatethe die connections for moving the die members toward and from the pot and for opening and closing have now passed their dwell for holding. the die in registration with the pot,

the continued rotation of the power shaft causes them to retract both die members, the follower more rapidly than leader, thereby opening the die by, the time the parts have reached initial position; and the cast is now removed by suitable manual The machine'shown. in'the drawings for operating as above described comprises -a supporting structure consisting of. a base mounted upon said base. Upon the bed member at the rear end the metal furnace and metal pot'are mounted bein upheld by uprights, 5, 5, projecting rigidy up from thebed and carrying at their upper end the furnace or heater, 6, in which the metal pot, 7, is suspended, being supported by a marginal flange, W, at the top of said pot. engaging the'margin of the aperture, 6, in

the top web of the heater. '8 is a gas con- V I duit extending in annular form around the top of the heater having a connection at 8,

with the gas suprply pipe and having, leading downward om the underside and inward through the heater wall, gas burner connections, 8", 8 The metal. vpot has a dischar e nipple, 7", at the bottom controlled y the valve, 9, whose stem extends out through, a suitable stufling box, 10,-

mounted'onthe top web of the pot, and is connected for operation by a lever, 11, fulcrumed on a bracket, 7, which projects upwardly iirom the top of the pot. The lever is operated by a downwardly extending pull v rod or connecting link, 11 which comprises an adjusting turn-buckle, 11 and extends through a guide lug, 4 which projects from the bed, 4, and is provided above said lug with a spring, 11, coiled around the rod and reacting at its upper end against a tensionadjusting nut, 11, whereby the spring'reacts for thrusting the link upward and thereby thrusting down the valve-carrying end of the lever, 11, for closing the valve when. relieved from the action of the valve operating cam hereinafter described.

12 is a fluid pressure pipe. This pipe leads from the fluid pressure controlling valve, 13,

hereinaftef described I with its operating connections. .4 I v The die carrying structure, B,-so indi? cated as a whole,is mounted on the bed, 4, at the forward end portion thereof. It comprises a carrier, C, for the leader-die holder; This carrier comprises a base, 16, havlng wheels or rollers, 17'and 18,,for 'ridingarespectively upon tracks,- l and 4, mounted upon the top of the bed, 4. The track, 4, as

shown comprises both an upper and lowertrack member. so that the" rollers, 4, are checked againstuptilting ofthe carrier as well as supported on the bed. This carrier" comprises also standards, 19 and 20, at the end respectively toward and remote from the .7 pot, and an intermediate standard,20", and

' 21, respectively, of the carrier, C. On the rock shaft, 26, extending between the standards; 19 and 20*, the-re are sleeves, 30, 30,

follower die member; The holder-for the follower die is seen at23. The carrier comprises a traveler, 24, mounted for sllding on the rods, .21 and 22, and having projecting Y horizontally from its opposite sides downwardly facing racks, 25, '25, and ournal bearings, 24*324 for horizontally, extending,

rocks shafts, 26, 26, which are j ournaled also in bearings, 29, 29 on the standards, 20 and having each a longitudinal slot, 31,, into i which a stud-and-roll, '32, projects from the shaft, 26, for driving engagement of the shaft by the sleeveto rock the shaft in the rocking of the sleeve which Is caused by the fact that said sleeve is in effect the wrist or hub of a terminal, 33, which is secured to a.

radial lever arm, 33, of the sleeve at one end of the latter, said lever, 33, being pivotally connected at the other end to the outer end of the stem, 34, of the piston, 35, playingin the cylinder, 37, mountedpivotally in the standards, 36, as above described; The above description it will be understood applies to the similar and substantially identical 'oon-' nections from the two cylinders,37, to the two rock shafts, 26, respectively.

The rock shafts, 26, have at their end toward the 'leader-die-holder segment gears,

27, meshing with the racks, 25, respectively,

for reciprocating the core carriers to-thrust the cores into and withdraw them from the follower die member carried on the holder, 23. The movements described and ndlcated the foregoing general description of op.-

er ation are derived from the power shaft,

j 57, journaled in bearings, 2*, 2?, provided upon' the outer or forward end of the front standard, 2, a third bearing being provided at 2' in the bracket, 58, which is mounted by means of a base flange, 58, on the rear side of the standard, 2, for the coaxial driving shaft, '57", which communicates reduced speedto the shaft, 57, through theplanetary gear system shown at D and hereinafter des wheel and the bearings, 2 a clutch wheel, 60, keyed fast to the shaft. The power wheel is engaged with the clutch. wheel, and thereby with the shaft by means of the clutch dog, 61", pivoted at- 59 on theclutch wheel comprising at the inner end of its journal a 85' short clutch head, 61", which is adapted to make a cramping engagement with the inner scribed, Power is communicated by means of a band wheel, 59, loose on the shaft, 58,-- v having adjacent thereto between said band surface of the annular flange,59", on the power wheel, 59, the outer end of the dog having a lever arm, 61, which projects in obhquely,that is non-radially with respect to the wheel and shaft,in, position to .be encountered and deflected for rocking the dog into'cramping position by the conetapered end of a shipping collar, 62,, mount ed for sliding on the shaft and having a poripheral groove, 62*, engaged by the fork, 63 of the shipping arm, 63, whichis-carried on a shaft, 64, mounted in lugs, 58" and 58, on the bracket, 58.- A spring, 65,- coiled around the shaft, 64, stopped at one end against the bearing lug, 58, and at the.

other reacting against the hub of the ship ping arm, 63, holds the shipping collar, 62,

out of engagement with the dog, leaving-the shaft disengaged from the power wheel.

For operating the clutching means described, f to cause the shaftto be driven, there is pro- 1 vided a bell crank, 77,- fulcrumed on the un d'er side of the beohd, having one arm forked and engaged between two collars, 66, 66, on

the shaft, 64, the other arm being connected by a connecting rod, 78, with a' hand lever, B

79, fulcrumed on a bracket, 1", mounted on its the outer side of the standard, 1, andextending up at the forward end of said standand terminating in a handle, 7 9, for man-' ual operation. 80 is a'locking device pivoted on the bed and havlnga catch hook, 80, for

ngaging the lever,"79, p d d n-1 0 spring, 81, for-tending to swing and hold it' in looking position; so that; the-,operator swinging the lever,',79, into position when the operator swings the lever, 79, into position' for throwing on the power, immediately upon the starting of the movements which comprise the withdrawal of thecanrierbase, 16, away from raised p'osltion seen 111" Figure 5, to the position seen in Figure 12. the lever is locked and remains held in that position until released by the disengagement of the 1 lock, such rel ease occurring automatically upon completion of the cycle of the move ments of the machine which comprise one complete revolution of the power shaft and the return ofjthe carrier base to raised position, as in Figure 5. For dlsengagementlof .the lever, 79, thus automatically'upo-n the completion of the cycle, there is provided a projection, 6 from the base, 16, of the die carrier, B, which encountersa lug, 80, on a lock, ,80, at the limit of the die-retracting m'ovementof said carrier, which is the concluding movement of the cycle, and by such encounter disengages the look from the lever, 78, which thereupon permits the spring, 65 to disengage the clutch leavlng all parts ofthe machine at rest in normal initial position. I

The planetary gear speed reducing system, D, consists of three epicyclic gear pinions, each double,'that is composed of two gears, 100 and 100*, carried on a rotor, 101, having a sleeve hub, 102, by which it is mounted fast-on the shaft, 57*, the power wheel, 59, being journaled loose on said sleeve hub. The epicyclic pinions have their smaller gear, 100,-meshing with an internal gear, 103, which is fixed being secured at its peripheryto the periphery of a easing,.1 04, for the planetary system, saldcas ng bemg mounted' fast 'in'the standard, 2 The larger gear member of the epicyclic pinions, 100 meshes with a second internal gear or sun wheel, 105. .The ratio of the number of teeth of the gear, 105, to the number of teeth of the pinion, 100, is less than the ratio of the number of teeth of the internal gear,

103, to the number of the teeth of the pinion,

100. As designed inthe present machine the internal gears, 100 and 101, differ 1n the number of their teeth by one (1) and the epicyclic pinions have each the same number of teeth; so that the internal gear, 101, makes ,one revolution for as many revolutions of the rotor as the number of teeth in the fixed gear, 100, which is about fifty.

On the power shaft, 57, there are cams for ,controllingf-and in respect to certain of them, producing,--the movements indicated in the foregoing description of operation of of the cam is operating against said lever.

At the end of the shaft, 57, remote fromthe power wheel it carries a cam, 42, which in the rotation ofthe shaft actuates a lever, 43, for opening the valve, 44, which controls re iance admission of pressure fluid to the pot for haust, 44,1 at the same time closing the inlet port, 44, and relieving the metal in the pot fromgpressilre fluid. y I

45, 45, are reciprocally formed face cams mounted on the shaft, v57, with their faces having the" cam grooves, 45, toward each other. 46' is a duplex link or thrust bar which is forked asseen at 47 for striding the shaft, 57, said thrust bar having at the head of the fork stud-and-roll,abutments, 48, 48, projecting oppositely for engaging the grooves-of the two cams, 45, 45. The other end of the thrust bar "is pivotally connected to a rocker, 49, fulcrumed on a brack: et, 4 depending from the bed, 4. The rotation of the shaft causes the cams, 45, to reciprocate the'thrust bar, 46, with a dwell at the limit of the pulling stroke,-at the position shown in Figure 3. The rocker, 49, is connected for giving the reciprocating movement described to the two parts of the die, referred to respectively as the leader and follower. For this purpose said rocker has two link connections, one by the link, 51, connected to the upper forward.

corner of the rocker and extending forward,that is in the direction of movement of the die for'registering with the pot,and connected to a lug, 16", projecting from the base, 16, of the carrier for the leader die member. From the ot-her,lower rear cornor-of the rocker,-it is connected by a thrust link, 52, to a linkage systemwvhich connects the carrier for the leader die with the carrier for the follower die. This link age is duplex, that is, comprises duplicate members respectively parallel operating in parallel planes at opposite sides of-a longitudinal'vertieal medial plane of the carrier as may be seen in Figure 9': Describing this linkage by reference to one set of said links only, it being understood that the description applies equally to the other set, it consists of the bell crank lever, 53, whose lower end is connectedto the upper end of the thrust link, 52, a radius link, 54, connected at one end to a pivot fixed with respect to the carrierv for the leader die,

and atthe other end to the bell crank.v

lever at its angle. Thefirst mentioned pivtained on a longitudinal member, 90,- which is mounted in the rear standard. 20, of the carrier and extends at the mid vertical longitudinal plane of the carrier through the standard. 20*. The bell crank lever, is pivoted midway between its angle, and the end remote tt'rom the connection with the- I thrust link, 52, to a sleeve, on, which is" l mounted for sliding on the member, 90; and the end of the hell crank lever is pivotally connected to one end of the thrust link, 56, whose other end is pivotally connected to the carrier for the follower die.

The operation of this linkage upon consideration will be seen to be, that the rock'- ing of the rocker, 49, primarily operating- \Fhich is folded at the initial position is.

straightened out at the final position thereby increasing the distance between the fulcrum of the radius link which is fixed on the carrier, B, and the final pivotal connection of the thrust link, 56, on the carrier, 24. The operation of thus straightening and thereby lengthening of the. linkage is to advance the follower die into engagement with the leader die during the movement of the .entire die and operating parts bodily, .to

a position for registering the die with the pot nipple. The dwell of the earns, 15, occurs at the stage at which the follower die has overtaken the leader die and the latterhas its inlet immediately under the pot nipple. While the parts stand in this relative position the die is uplifted to regis ter the inlet snugly with the pot nipple. This movement is produced by thecams, 120, on the shaft, 57, said cams having each the slight upraises, 1.20, which at this stage encounter the vertical arms of the bell-crank levers, 121, fulcrumed at 122 on the standard, 2, and having their horizontal arms connected with the lower ends of the thrust rods or die lifters, 123, guided in lugs, 124, on the bed, their heads being overhung at this stage by the die' which has been thrust in above them in the die movements above described. In the up thrust of the 'die lifters the die carrier pivots over the wheels, 18, at its right hand end for the very short uplift of the die carrier and over the wheels, 17 at its left hand end which is necessary to bring its inlet into snug registration with the pot nipple. Springs, 126, reacting between the lugs, 124, and the ends of the horizontal arms of the bell-crank levers, 121, retract the die lifters when the dwell of the cams, 120, is passed. The dwell of said cams is coincident with the latter part of the dwell of the cams, 45, and during the overlap of their dwell the die is filled with the metal from the pot; whereupon, due to the relative position of the several cams on the shaft, 57, the pot-discharge-valve is closed and the fluid pressure is cut oil therefrom, these operations being followed by the re-. traction of the two dieparts and their respective carriers in the reverse order of'the movementsabove described for the advance and closing of the die, While the thrust bar, 58, is retracted to initial position and the parts come to rest with the die opened and the cast accessible for removal,

The member, 90, is utilized or may be said to be primarily, provided, for the purpose of a tiuid-pressure-operated knockout, said member being tubular and connected at the outer end with a pipe, 91, leading from a source of compressed air, a rod, 92, operating as a piston in the tubular member, 90, being actuated by the admission and exhaust of compressed air for tapping the die to loosen the casting, according to well understood practice; for which reason the connections and mechanism for causing the tapping action are not shown.

It may be understood that means arepro- *vided for cooling water circulation through the die holders as indicated by several hose connectionsseen at 110. These are not different from common constructions and require no further showing or description.

I claim 1. In a die casting machine in combination with a supporting structure and a metal pot carried in fixed position thereon, a guideway on said structure for support and movement of the die to and from position for registering with the metal pot, a carrier mounted for movement along said guideway; holders for two die members to be closed together for receiving the metal and, separated for removing the casting, said holders being mounted for movement ta'n dem,one leading and the other following,from open to closed position of the die, the leader being mounted on said carrier, said carrier extending from a point in front of to behind the follower; linkage connecting the follower with a rear point on the carrier, said linkage adapted to be collapsed or folded by the retraction of the follower from the leader, and to project the follower toward the leader when straightened; a rocker having a fulcrum fixed with respect to the metal pot; link connections from said rocker to the carrier for reciprocating it along the guideway and a thrust link from the rocker to the linkage between the follower and the leader carrier, for straightening said linkage in the rocking movement which advances the carrier and folding the linkagein the opposite rocking movement. I

2. In the construction defined in claim 1 foregoing, the chord of the arc of movement of the pivotal connection to the rocker of the link which reciprocates the carrier being approximately parallel to the path of rethe . ciplocation of thecarrier; whereby the link thrusts and pulls nearly horizontally and nection of the, rocker to the lin which opcrates the follower die holder being in general upward and the thrust link extending.

upward for connection with the linkage to be straightened.

3. In the constructiondefined in claim l forego1ng,-the linkage comprising two paralcran member pivoted at its an le to one end of a link whose other end is ivoted on the carrier, said bell crank memlder being pivoted midwa in the len th of its actuating arm at a pivot mounte the carrier, and the extremity of said, arm

position thereon overhanging the bed, a die being pivoted to one end of a linktwho'se other end is pivoted to the holder of the follower-die member.

5. In the construction defined in claim 1 fore oing, the linkage comprising a bell cran lever operatively connected at one end to the thrust link from the rocker, a radius link from the angle of the bell crank to a fixed pivot on the carrier; a pivot mounted "for sliding along the carrier, thesecond or actuatingarmof the (bell crank being pivoted at its middle ointto said sliding pivot and a thrust link rom the extremity of the bell crank lever to the holder for the follower die; a 6. In a die casting machmeincomb'ination w th a frame. structure comprislng a sub stantially. horizontal bed, a downwardly discharging metal pot' mounted at elevated carrier mounted for movement longitudinally of the bed from a position clear of the pot to a: position under the same; .means foroperating-the carrier to so move the ath of movement of the ivotal confor sliding along (lie; means for elevating and upholding the die for registration of the die inlet with the pot discharge nipple; means for shutting off and for forcing dischargeof themetal from the pot; a power shaft and cams thereon for operating in predetermined time relation the die-advancing. and uplifting movements and the metal shut-ofl' and the metal discharge means.

7. In the construction defined in claim 6,

foregoing, the die carrier comprising holdem"; for two die members adapted to be closed together for receiving" the metal and separated for delivering the cast and means for relatively moving saidholders to open and close the die, said means ,being connected for operation by the means for moving the die into and out of position for registration withthe 0t. i

8. In t e construction defined inclaim 6, foregoing, the die carrier comprising corecarrying members, fluid pressure means for operating the core-carrying members, said fluid pressure means comprising a piston'and cylinder carried by the die-carrying structure in the movement toward and from the pot and manually operable valve means on the supporting structure for controllin access of the fluld pressure to'said cylinder,

9. In the construction defined in claim 6,

foregoing, the means for forcing the dis chargeof metal from the pot to the die being fluid pressure means, 'a valve mounted on the supporting structure for controlling.

the access and exhaust offi'uid-pressure to the pot, the cam on the ower shaft for operating said valve being formed and positioned for admitting and cutting off the vfluid pressure coincidently with the openand closing of the metal discharge valve;

in In testimony whereof, I have hereunto hand at Chicago, Illinois this. "7th set In dayo Sept.,1922.

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