US2012548A - Die casting machine - Google Patents

Description

4 sheets-sheet 1 Original Filed March 5, 1932 Tm 1a e. U 0 Q. rl L Z I@ Il. r O O 0 G \\H|.|||.|w. Q. C n g5 ww y |l/ NN n j \m\- @l WSN Rm. Q QQN h. @w oo. .v @N www mv m II 1: o o uw EN NQN um, iw Sm-. NW f@ um. rum wm, m mw w r H 1 im nu hm 1% l1- Aug. 27, 1935. c. ROEHRI DIE CASTING MACHINE Original Filed March 5, 1952 4 Sheets-Sheet 2 MNHN. KNMG men?" Carl, oeri fa/myd! Aug-27, 1935. C ROEHR. 2,012,548

DIE CASTING MACHINE Original Filed March 5, 1932 4 Sheets-Sheet 3 Aug. 27, 1935. c. RoEHRl DIE CASTING MACHINE Original Filed March 5, 1932 4 Sheets-Sheet 4 fzz/enzr CcarZ 06f/,721

Patented ug.V `2 7,v 1.9.35

the action of the die closingA mechanismb iswsno timed as to close the` dies with"a-relativelygsmall amount or" strainupon anyiport'ion of the mecha-v nism thus enabling it to be made of muchlighter weight thanr has heretofore-.been possible,V I

Itis also the purpose of this invention toprofv vide in a machine of this character avnove'l means for operatingl the receiverfor' the. molten mate:

rial -whichi'llls the die. 1 n n A further object oi 'thefinventionis' to provide a novel timing mechanism fwhereby. thei'mfovable' section' of the die andthe core parts of the die are moved into position and retracted and the"` material ...which is being `cast is suppliedinj a denite'timed sequence that maybe varied over a wide rangeto adapt the device tofdiierent kinds of castings.

Another object ofthe invention is toprovide a. novel stop mechanism whereby to lbiingall of .the moving partsto definite stops in the proper'r positions during the'oycle of operationgi Other objects and advantages of this'inventioriA will appear as the `description proceeds in conneotion with the accompanying'drawingswhere-- in thepreferred form of theiinventionisshown; It is to be understood, however, that -1 the de'- scription and drawings areillustrative only and are not to be taken as limiting th-efinvention ex cept in so far as it is limited bythe ol'aim'sj i In the drawings- Fig.. 1 isa side View partly in, section -of- 'a' die castingmachine; `i v.

Fig. 2 is a plan view partly in section of- Athe machine;l Y .f i

. Fig. 3 is a section onthe line 3-3 ofFig. 2;`

Fig..4 is a sectionon the line. 4-4fof Fig. 1; Fig. 5 is a section on the line 5 5v of Fig'. 1;` Fig. 6 is a section on the lineb-l'of` Fig.y3;" Fig.A 'lis a section on the line k'1 -l ofFig.` 3; Fig.'8 is a side view of a lportion ofthe core operating mechanism, this view being taken substantially in the direction indicated at i-ron Fig.r 2; and

Figs. 9, 10, 11, and 12 are diagrammatic` views illustratingy thelvarious positionsof the '.*tirning mechanism during a cycle of operation.

vReferring now inv detail tothe drawings. the machine `:includes heating meansindicated gen-g erally at lil beneath-ay vator receptacle l I which contains the material-tol be. used in casting', this'. receptacle ll being normally kept substantially filled with the molten material. The receiver.

aan Marhs, 1932, serial Nov;- 596,919 'Renewed Ma1ch"15, 1935 f (oiga-93)* v Y* y I2 extendsdownlintofthe receptacle il landinas( an inlet at I3 closed bythe stopper I4 when" there-y ceiver is in uppermost position andl opengw'he'n the receiver is lowered into the receptacle to peri Amit the material to iow into thechamber l5 of the receiver. The outlet from thefreceivelr tothe.

dies consists of a passage "I6 starting fromV the bottom of the chamber I 5 andcurvng upwardly to annozzlerat, I] which nozzlegwhen` the receiver is raised,4 ispositioned as shown'in Fig. 1 tofdisf. r

charge the material between the dies ,I8 andll?. By asuitable mechanism rto be hereinafter described, Vthe Ynozzle |1 is always held above the levelotheliquidin thelreceptacle Il.A

The die i8 is the stationar'ydie and forms a part oi a ysecond section of the machine. lThis section consists ofthe frame member 20 whichv as lshown more clearlyin AFig-,2,A is connected to the casing 2l housing the receptacle IlA and its heating means I `This member 20 has the exso thatfthe member. `20.1.nay bez-adjusted.er'idwisev along the top of the-casing 2 l. The movingmech'- anism'ior adjusting .the member 20 consists of' 20* tensions 22v and123 `which are slotted as indicated at 2li; and 25 soazsyto slideon the bolts 26"and21;

the rods 28 and 2,9 each rod being.;screwthreaded y into a suitable` lug :30 such as shownon the lmemf f n ber22. The-rod28 is adjusted by screwing the"v two nuts'll, and 32 on opposite sides oftheclug `33 attheback-end of the'oasingi, the rod-'projecting' through thislug as indicated in,.Fig.2. The member 20 isconnected by 'four rods 34,35;

- 36,andi'lfto.thegearahousingBB wherein the A i timing".` and driving gears v are mountedapf'his y' housingis supported by a leg 39.

Y .The lsectionof the machine just described includes substantially all of Vthemechanismkwhere-l by the movablediexl is caused to moveinto and, out of closed position and .whereby the core mem'- bers are inserted and withdrawn. .The amovable die I9 is supported onfa frame piece-4B. 4wl'iichis connected with another. frame 1piec'e4'|v by means;v f

ofthe bolts such Aas 42 and-43.andithisentire` framework is linkedbyjmeans of the four con necting rods-'such las 4ll ,45,f 46,*iand141'to. the cranks 48, 49.15B; vand 5|, thesev cranks beinggears are connected byqthe idlel gear softhat they turn inthe same direction atthefpsame ratel mounted upon the shapftsZ and 53 whichshafts;l i areinturn drivenrby'the gears54 and-55. Theseof lspeed thus moving all four of-.thekli'nks'M tolA Altogether to movetheframework Datothus ad-fg in connection with thfeinuts such'asy indicated at 51 and 58, provide means for ample adjustment of ,N ,fi 2,012,54

theframe piece 40 totakecare of larger or smaller dies I9.v The gear 55 is driven from a main kas an electricjm'otor. .The shaft 60 hasgears 59 and 6| thereonl and also a third gear 6&5 which A third gear meshes with a small spurgear'gri'l, mounted 'on the shaft 08 which shaft is journal-11.8151 in the frame andhas at its outer ends. the twoy cranks 69and 10. e,

The shaft 53 through the cranks 69 and 10 and 4the links 1| and 12 operates 'themechanism vfor pushing inand retracting the core rods shown at Y 13 and 14 in Fig. 2. Through the links ll and 1,2', p this shaft also'operatesthe mechanism for low-v eringand raising vthe receiver `I2 as Vwill be hereinafter more4 clearly described. i vLinks il and '|-2 are-connected tothe vracks 15 and 'lr6 at opposite sides of thefmember 20, and theseraek's in'turn mesh withy thepinlons on the lower ends of the` members 11 and 18 sothat as the racks are moved the two members and 1 8 are causedto turn'in opposite directions as indicated bythe arrowsV in Fig. 2. These members l1 vand'li! have gears meshingwith the racks 19 and ,nllwhich are'suitably guided by'means of the plates8| and 82 and which carry the core pins 'i3 and 'I4 rat their innerends.I Membersjil and 18 are merely elongated gears. The top ofthemember 11 engages another rack 83'which rides on top of the member v10 (see particularly Fig. 4) andk i meshes with the gear 84.0n the shaft 85 which shaft/is mounted at one end in the housing 85 carriedby the member 20 andatlthe other end in the standard 8l rising from the receptacle 2 I. Gear 84 has'V a pinat 88jon'which the curved link 89v is secured, this link-being connected to another ,link 90 that carries the forward end of the 'receptacle `|2`,.the link 90 being engaged'with the web guidingV` the `link 90.

Y 9| as shown mosticlearlyfin Figs. l and 4; 1A suitable guide 92, is. mountedon the member 20 for The vback :end 'of' the ref ceptacle I2is movedup and down by the shaft 05 through the medium of the crank arms thef'link. 95, and the link 9 6.

93 and 94,

attention is directed `atth'is time to vthe Yfact that arms 93 and'94 are considerably longer than the distance between the center of Althefshaft 185' i and the pin88 on the gear 8.4.' The reason for this difference is to provide meanswherebythe back end of the receptacle SI2 may beloweredE well below the forward end'sothat thexinlet .13, may ibe submerged within-the` metal inthe vat: H while the nozzle |.1 is retained abovethelevel of the i, molten metal. v

fThe-metalfrmthe chamber I5"v isforcedinto j theY die by fluid-'pressure from some exterior force entering into the valve from =.the conduit 91; 'Ijhe valve98- is an ordinary threeway valve which in the position shown in-Fig.y 1 connects theY pipe 99 with the exhaustV pipe so that any air-iri chamber |fmay escape by passing out through? f the passage |0|, movable conduit |02-, conduit |03, pipe 99; the` valve to the exhaust pipe |00; However, when the link |04 connected to the valve'is ymoved'to theleftlrom the vposition shown' in Fig. 1 it, shifts ythe valve solas to conneet pipes-91V and 99 together andthus pass the air under pressure through pipes Iliaarmir n|112 and means of the worm passagev|0| into the chamber I5. Link |04 is controlledby means of the link |05, cam |06 on shaft 60, and spring |01. lThat is to say, normally thecam |06 holds the valve in the position shown in Fig. 1 against the tension of the spring |01. When, however, the roller on thel link |95 drops into therec'ess |08 of the cam, spring l0? shifts link |04 to the left'to direct the air into the chamber I5 and forces the metal down in this chamberand'upv through the passage I6 into the dies. f

A distinct feature of this device lies in the fact that the arrangement of the receiver |21and the outlet passage I6 in combination with the inlet v|3 and-the'air inlet |0| always causes the molten material to Venter at the `back and top of the chamber l5 while thev material entering the die Hisforcerl from the bottom of the chamber I5 up through the passage I6 thus any dross or light impurities which may be on the metal and which may get into the chamber |5'cannot find its way into the casting. The material for the casting is always drawn from the bottom-ofthe chamber 'I5 while the lighter dross is always near the top ofthe chamber. i Y

.Referring now particularly to Figs. 1 1 and 2, I

provide means forknocking the casting out of' 3 the die I9 atthe end of the opening stroke therevof.This means yconsists ofthe. pins ||0 and Hi which pins` are connected by the plate `i i2 and normally held back in the position shown in Fig.

1 by suitable springs about the pin or by the pressure o f the air or uid material within the casting chamber.-A set of pins. |.|3, IM, H5, and H5 are carried upon aback plate it? to. which are connected the racks ||8 and |l9 which racks engage a` commongear |20 carried on the backof the framemember 4|. One of these racks is adapted at the` end ofA the-retractilemotion of the frame carrying thedie i9 to engage a stop |20 and thus force-the racksfforward to in turn force the pins ||0-and Hl'against -the casting and knock it out .of the die. Y

In order to insure the proper stopping of the core pins and the die moving mechanism in proper positionsatall times, I employ cams and lock mechanisms in connection with the gears and 59 and the gears 66 and 61. i This mechanism is brought out more clearly in Figs. 3, 6, and 7.

Referringnow to Figs. 3 and 6, the gear 59 has l acam I2| xed on the face thereof and a lock member |22: mOuntedupon a block as |23 that surrounds the shaft 53 upon which the gear 55 iskeyed. ABlockIZ-, however, is xed against rotation by being formed on the bearing for the l' shaftf53 so that the action of the cam is merely to raise orlower the member |22. The member |22 carries on the, side next to the gear 55 alocking pin |24l which, when the cam |2| rpermits the .member |22 to. drop, engages inthe teeth of thel gear and securely locks 'this gear against further rotation until the gear 59 shall have roand 67, the gear |55 is cu-t awayin two portionsnamely; the portion |2'l' and the portion |28`and the cam l2 9v thereon'is similarly cut away.` This cam-like member |2| is a separate cam securedon'the gear so as to rotatetherewith. The locke ing mechanism consists'ofthemember |30 which member isaperturedatglBll with a slightly `,oblong apertureto receive the shaft and is apertured` at |32 withv another oblongaper-ture to re'- ceive the shaft 6B upon which the gear 51 i's'xed.

AA -spring |33 `normallytends to pull the member v |30r down so as to bring the locking pin |34 into engagement with the teeth of the gear 57. A lug l|35 on the member |30, however, rides on'the cam |29 and prevents this engagement except when this lug can drop intothe'cutfaway'portions |27 and |28 of the cam.'V `When the lug E35 drops into ,one of thesecut-,away portions, it is clear that the pin |35 will drop into engagement with the gear GTI and look thisfgear against further motionuntil it is released. In this way gears 65 and, 6l'A are prevented fromrotating in anydirection during theV time that the smooth portions -ofr the vend an inwardly extending pin ilwhich pin is adapted to be .pressed outwardly so'as to'release the clutch Bil by another pin |30 carried on .the worm gear 6 i.' 'Ihis pin is so related to the other mechanism that at theend of the retractile movement of the frame carrying the die I9, pin- |39 forces pin |38 outlto release the clutch $4 and then, owing to the momentum of the machine,V

cani |2| is attached. The shaft A.ii continues to passes slightly beyond this pin so as to permit the clutch to be again closed.' f l Referring nowparticularly to Figs@ 9vto 12, I have shown here the various cams and :their associated gearing in several positions which they take during the cycle of operations that involves i the closingof the dies and the raising of the receiver nozzle,` the opening of the valve, `the subsequent :withdrawal of the core pins, and thenthe opening of the die and the kicking out of thecornpleted;casting.r n y As shown in Fig. 9, the cam |2`I has'thecutaway portion substantially directly opposite the gear 55. This is at, the starting or stopping point Vas indicated by the positionsv of-crank arms 49 and 5| which control the-withdrawal'ofthe die i0 and the crank arm i0 which controlsv the' withdrawal of the core vpins and theA lowering and raising of the metal at the receiver |2. The direction of rotationr of the shaft 'andV the refspective cams is `indicated inall yilguresl bythe Asthe rotation begins, cam |29 has just re,- leased its lock for the gear lil'and the action taking place during the rst part of the revolution of shaft 60 is to simultaneously.V swing the y cranks 40, 5|, and |0'so as to advance the kmovable die l0 and at the saine time by advancing the links li and 'i2 to advance the core pins I3 and le. During this period, the gear is moving the rack 83 to turn shaft 85in a clockwise direction asV indicated by the arrow in Fig. 4,

thus raising the receiver |2out of the receptacle The back end of the receiver waslowered the lock pini |34 `to drop into engagement with` the gear 61 and thus stop the gear 61 with rthe'mechanism inthe position shown in Fig, l;

that is with 'thereceiver raised,the. die' closed,l and -thefcore pins moved into place." Thus'all. of the closing action preparatory toforcingij the molten materialinto the die is accomplished at The gears 55 andA 54 are alsojlocked' at l' this time due to the fact that the locking device Y |22 has droppedfdown'foif the cam at the'pointl |265. Shaft continues to` rotate, and .at this Vtime the cam |06 allows the pin lonithej'lever me to drop intorthersiotted section ses .thus

beri and force the material into the die. 'Dur'-v ing the' period` required for this action whichis `indicated at .the` `period expiring between the position shown in Fig. l0 and that shown in Fig. l1,"the die is.fi1led,andgthen the valve Vis f operating thevalve 98 to force air into thercharnig j f closed, the other yparts remaining locked Vstationary.

The next actionv taking place is''tofpull;out20` the cores and drop Vthe receiver back 'into the receptacle This 4is done by the camyl-ZS arriving at theposition yshown in Fig; 11 kwhich releases gear 61 fromits lock and' again rotates 25 thisgear `to pull the links 'H `and 12 back'vv and therebyfreversingthe rotation ofshaft 8,5' andr e n yalso reversing the -movement of Y the racks 19 y and to withdraw'the cores. v` During all of-this time, howeventhe dieremains closed `owing to the fact that gear 55 is*'stillridinggasshown by Fig. `l1, ona bare section of theggear to which.

move thereafter guntil the cores are completely withdrawn at which time the ygear 61 is, again :y

locked by the :locking mechanism associated with camil|29g VCam, |2| releases the-gear 55 and it againengages teeth on gear-5S ltocontinue the rotation of gears 54 and 55v and thus withdrawY the die' I9 bymeans of the links 44, 45, etc.'- Gear 1S?. at this time has been-.locked against' rotation so the receiver .l5 is stationary in its to thus knock `the casting out ofv the` dier|9, andV simultaneously. `therewith the pin |39... on thel worm wheel H engages with pin |38 to throw vout v the clutch'an'd yto stop the machine bringing allofl the Yparts back to the position represented `in Fig. 9.' i

f As an example veftlie angularmovements of the shaft 60 during thisncycle, the rstmove.-

ment as shownfconsistsjof any angular move,- Y

ment of 103 tov close `the dieandinover the cores ,into position as well as to raise thev receiver up to the position where' it may ll the dies; The

valve is then opened and closed during the next 51 degrees of rotation of the shaft 60. The core tuv opens, and the receiver goes down yduring the next 103 of lrotation of the shaft, andr then the final 103 .of rotation opens' thedie [and 1"* stops the machine. g There is considerable range of movement possible with the same mechanism just by changing 'the time gears. and cams. I`

lowered position, and the cores are stationary in their withdrawnpositionwhile thek die is beingopened. Further rotation of'shaft 6G AOpens the die and brings the rack ||8 vagainst the 'stopQIZD' 655. nd that I may vary the closing betweeny 80.

and 118 angular movement for the drive shaft between l80 and 118.

I can Vary the Valve, Opening and closing .l between 120 and 6, and the core opening andi..1

Lil)

lightness ofthe structure Without 'the "sacrifice,

` of lany needed strength.

.The pressure onthe material Within the die is always vunder control regardless of .the 'size of casting made as this pressure depends Wholly upon. thev pressure supplied behind ther moltenY material inthe chamber i5. The dies are closed and ,locked in closedpo'sition'before the material is allowed to enter them. vMoreoven they are re tained in this locked position during the removal of the core' pins vso that no difficulty can be encountered at this'point. The receiver l24 is submergedrduring all of the vcycleexc'ept that at Whichit must be raisedin position to fill the die and this is only a' short portion ofthe cycle. This in itself aids tin vpreventing the light impurities in the molten "material from ,getting into the chamber i5 inV excess quantities as they` have av chance to adjustthernselves While' the inletV 3/ is submerged and thu'sfescape from the chamber I5 orr at .leastrpermit suncient good'v material to reach the bottom of the chamber l5 to supply the necessary'amount for each casting. y i

From the above description, yit is'believed that the construction and operationv of this device will be clear to those skilled inthis art and the ad-V 'i vantages thereofv readily apparent.

` 'Having thus described one specific form of my invention,l What I claim `as new and' desire, to secure byLetters Patent is: f 1. rIn ja 'diefcasting vmachine having in combination a stationary die, a'movable: die, a core pin movable into an'dout-ofthe dies, a Vcrank and means connecting itto said1 movable die to advanceand retract it, 'a second crank and means connecting it tothe core 'pin tomove 'the corel `pin in rand outffsep'arate gears driving said cranks; a ,drivesh'afh and means connecting both said gears to said shaft at thesame time 'to canse closing ofthe dies and insertion of the core pin,

and successively connecting said gears to said shaft'to canse withdrawal of the corejpin-.fand

opening of thedie's.

2. In ai die casting machinehaving in'V com# bination a stationary'die, -a movable die, accre pin movable into and out of the dies, a crank and Vmeans connecting it to said movable die to iad- VVBJIiCe and retractit, a second crank and means connecting it'to the core pin to movepthef core pin in and out, a shaft for each crank, a drive shaft, means connecting each crank shaft with the drive shafttransmitting power to each crank shaft during a portion of each rotation ofthe e drive shaftand releasing thegcrankshafts from the drive shaftduring 'other portions of'each rotation of theA drive shaft, and locking means holding said crank shafts stationary WhileV they are releasedfrom the drive shaft".

3. In a die casting vmachine having 'in' combination a stationary -die,[a movable die,` a core pin movable into and out of the dies, a crank and means connecting it to said movable die to ad-y Vance and retract it, a second crank and means connecting itgto the cor'e pinto movethe core 1 bination a .stationary die, a movable die, a core pin movable into and out of the dies, a crank.

andmeans connecting it to said Vmovable die to advance and retract it, a second crank and means connecting it to thevcore'pin to move the'core pin'in and ont, a shaft foreach crank, a drive l shaft, means connecting keach crank shaft with the driveshaft transmitting power to each crank shaft during' aportion of each rotation of the drive shaft andreleasing the crank shafts from the drive shaft during other portions of each rotationof the drive shaft, and locking means holding said crank shafts stationary While they arereleased -fromthe drive shaft, said drive shaft havingcontrol cams thereonfor actuating said l locking means. Y

5. In avdie casting machine having in combination-"a stationary die, a movable die, a core pin movable into and out ofthe dies, a crank and means connecting itto said movabledie to advance andretract it, a second crank and -means connecting Vit to the core pin to move the core pinin and out, separategears driving said cranks, a drive shaft,`and means connecting both said gears `to said shaft at the same time to cause clos-` ing of the dies and insertion of the vcore pin and successively connecting saidV gears yto said shaft to cause Withdrawal of the core pin and opening ofthe dies, said last named means comprising mutilated gears on the drive shaft.

CARL ROEHRI.

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