Патент USA US2408912код для вставки
" Oct. s, 1946. A. A. BURRY ‘ 2,408,911 PLASTIC MOLDING MACHINE Filed Nov. 11', 1943 5 Sheets-Sheet l ‘D 0 Infeh I01: Oct. 8, 1946. A. A. BURRY 2,408,91 1 ‘PLASTIC MOLDING MACHINE _ Filed Nov. 11, 1943 SYSheetS-Sheet 2 0ct..8, 1946. A. A. BURRY 2,408,911 PLASTIC MOLDING MACHINE Filed Nov. 11, 1943 5 Sheets-Sheet 3 26 4 14A 16’24 i5 J6 J6 \ W .22 / £75" cf» 3, 1943 A. A. BURRY _ 2,408,911 PLASTIC MOLDING MACHINE Filed Nov. 11, 194: 1 5 Sheets-Sheet 4 1 _ Inr/én for. i?- 16 . . / 1%‘ 0a. s, 1946. I A. A. BURRY PLASTIC MOLDING MACHINE 2,408,911 2,408,911 Patented Oct. 8, 1946 UNITED STATES PATENT ‘OFFICE 1 2,408,911 PLASTIC MOLDING MACHINE Arthur A. Burry, Toronto, Ontario, Canada, as signor to Cyril Fuller Application November 11, 1943, Serial No. 509,936 ' 5 Claims. (01. 18-16) 1 section taken on the line 4-—4 of Figure 3 or the This invention relates to machines for moldiner articles from plastic materials under extremely heavy hydraulic pressure and the principal ob toggle operating mechanism. _ Figure 5 is a horizontal sectional view of the abutment end of the machine taken on the line 5—5 of Figure 3. Figure 6 is an enlarged longitudinal sectional jects of the invention are to provide a machine in which the faces of the molding die blocks will be held in contact during the molding operation under hydraulic pressure, overbalancing the view of the injection plunger cylinder and heater taken on the line 6-6 of Figure 1. The machine herein shown and described com that the articles produced will be perfectly formed and free from ?ns caused by leakage of 10 prises a base I having a horizontal bed plate 2 at one end thereof on which is rigidly mounted an the plastic between the mold faces. abutment 3 through which extends a pair of hor A further important object is to devise a mech izontal tie rods 4, the inner ends» of which are anism in which the dies will be separated instan anchored in a ?ange 5 extending transversely of taneously following the completion of the injec tion operation so that the molded articles may be 15 the base intermediate of its length. A pair of horizontal tie rods 6 arranged above cleared from the dies with great rapidity and be the rods 4 and parallel therewith are secured at fore the material has become chilled. pressure of the plastic injection mechanism so A still further object is to devise a machine in which the stresses are uniformly distributed be tween the several moving elements, thereby re one end in the abutment 3 and the inner ends extend through a die block holder ‘I whichv is 20 slidably mounted on the tie rods 4 adjacent to the flange 5. lieving excess stresses at any particular point in A die block holder 8 is slidably mounted on the , the structure. tie rods 4 and 6 between the member 1 and the One of the principal features of the invention abutment 3. The holder 8 is formed with a cen consists in the novel construction and arrange ment of a locking toggle between a movable die 25 trally arranged lug projection 9 which is provided with a transverse horizontal slot ID in which is holder and a ?xed abutment whereby the die holder may be operated to close the die carried ' mounted a hardened steel block II which has an thereby against the opposing die and to be moved upwardly bevelled curved face I2 terminating in a bottom lip l3. . away from same with a rapid reciprocating move ment free from endwise pressure, a hydraulically 30 The abutment 3 is formed with a cylindrical ori?ce l4 having an annular shoulder l5 at the operated member being interposed between the inner end, and threaded into the outer end of said said toggle and the ?xed abutment to apply a ori?ce is a ?anged block 16. ?nal closing pressure between the dies. Slidably mounted in the cylinder ori?ce I4 is a l A further feature of importance consists in the novel construction and arrangement of hydraulic ' piston block H which has a reduced end extend ing beyond the shoulder l5 and spiral compres means for breaking the toggle and moving the sion springs l8 housed in recesses in the piston dies apart and for returning the movable die engage the shoulder and urge the piston inwardly holder and toggle into closed position. toward the end block IS. A still further feature of importance consists in the ?exible coupling of the stationary die 40 The inner end of the piston I‘! is spaced from the inner end of the block I B and both the piston holder with the cylinder of the injection ram and block are provided with ?anged washers l-9 whereby hydraulic pressure is applied to pull the cylinder into operative contact with the station ary die in opposition to the pressure exerted by 45 the injection plunger. ‘ In the accompanying drawings: Figure 1 is a plan view of my improved molding machine. held in position by centre plates 20 secured by suitable countersunk screws. A port 2| extends through the base of the abutment 3 midway between the inner ends of the piston I1 and block l6 and is connected to a suitable valve-controlled source of hydraulic pres sure supply. Figure ,2 is a side elevational view of the ma The piston‘ block I‘! is formed with a part-cy 50 chine. lindrical recess .22 in the end projecting from the Figure 3 is an enlarged vertical longitudinal cylindrical ori?ce and in this recess is secured mid-sectional view of the abutment end of the machine and the movable die holder and toggle mechanism taken on the line 3-3 of Figure 1. Figure 4’ is a part vertical elevation and half by transverse bolts 23 a cylindrical member 24 which is provided with reduced trunnion ends 25. Rotatably mounted on~the...trunn.ion ends 25 2,408,911 3 4 are a pair of side plates 26 which are formed ticles out of the die. with outwardly extending bearing trunnions 27 arranged intermediate of their length. release position by coil compression springs 43. The ends of the bar 42 project beyond the block 8, as illustrated particularly in Figure 5, and are adapted to engage the ends of rod members 44 A plate 28, preferably of hardened steel, is se cured between the side plates 26 with one end snugly abutting the cylindrical member 24 se cured to the piston, and the other end thereof threaded in lugs 45 extending from the abut ment 3. is curved to correspond to the curvature of the face I 2 of the block I I, said curvature,being1prefe The threaded rods 44 may be adjusted to any desired position v.so that-the free ends, thereof wilt. engagegthe;j‘knock-outt?bar 42 as; the block 8 is moved by the upward operation of the toggle, and by the manipulation of a suitable valve mechanism, which may be controlled by the erably theuarc of a circle, the centreof which ,is ., located above the axial centre of the member 24 on which the side plates swing so that the plate; 28 will swing up and clear the curyedwface of the block I I. Mounted on the'trunnions v2'I are .apai‘niof upward-swinging of the plate 28 or the longitudi nalinovement of the die block holder 8, ?uid ppressure'to the cylinder 35 may be reversed, that is to say, the port 39 leading to the bottom of thecylinder will be-connected to exhaust and the port. 40~will be connected to the pressure side of a suitable hydraulic ?uid supply. links 29 which extend, alongside the plate_s_,;;28.gg and are pivotally connectedto trunnion ,exten- _ sions 30 on the sides of the lug'~9-of the die‘bl'ock holder 8. The link members 29 pivotally mounted on the sidelplatesjli form‘ a toggle ,connecting the pis ton Il'with the movable die. block slidably'mount ed Q11 thelongitudinal tiebars? and 6. " Fluid thusv enterstheltop of the cylinder and forcesthe piston 34‘ downwardly, thereby swing ing the' plate 28; and through the toggle, return ‘ The ,plate28mounted on and‘swinging with the‘ side plates of the toggle'when‘in its lowered positipnlgas‘illustrated in Figure 3; forms a lock or‘ rigid istrut between the piston and the block 8. The plate 28"‘haswsegcuredhto its'underside a bracket, 3I.__which' is‘ formed with'a downward extending jawhandgbetweenrthe side lugs (32 of the jaw is -_pivo_tally fmounteda plunger rod 33." The bar 42 is held in the 25 ing the die-holding block 8 to its original posi tion," the’ plate 28 ‘having its arc-shaped face brought into- snug’ engaging contact with the curved‘face I 2- of the block II. This movement of the block 8 brings the die faces-into close engagement and through the manipulation of —a suitable control switch 45' pivotally mounted intermediate of its length on hollowedv gudgeons ‘36~suppo_rted in brackets 31 ‘engaged by, the plate 28; or any other part of the toggle mechanism; the valve controlling the inlet of hydraulic-pressure ?uid to the port 2I is‘ open,-~and the pressure ?uid ?owing in be tween‘ the block- IBand piston ll applies endwise pressureto the piston which is transmitted along secured to- the underside of the bed plate 2 either thelhorizontalcentre line through the block 24, A piston. 34 is" mounted on the rod .33‘ and op erateswithina cylinder '35 arranged in substan tially?right angular relationto the'plate 28,-and the plate 28 and the block, II to the block 8 car ryingthedie, thus applying hydraulic pressure to withl'a port 33:1eadingto the bottom end of the 40 force the‘ contact faces of the dies together with a pressure that willprevent leakage of the plas cylinder ‘35,"and the ‘other of said gudgeons is tic .materialwhich will then be forcedv into the connected to a port 40 leading to the top of the die. cylinder. j Suitable'lt'ubular- connections are pro The die-holding ‘block '1, which is mounted on vided with/‘each of they gudgeons to conduct hy draulic' pressure respectively-to the bottom and ‘ the. lowergtie ‘rod 4, engages the flange 5 to resist side of a3s1ot_38. ; Oneor the hollow‘ gudgeons 36 is connected top-of; thecylinder and to provide alternately for the exhaust of pressurefluid. ‘ It‘will be understood, that by the application of ?uid-‘pressure within the cylinder 35? against the bottom end of the piston 34, the piston and plunger-rod 33 are forced upwardly; the pressure ?uidiexhaustingthrough the port 40'. The upwardr’movement; of the rod‘ 33' lifts the plate‘ 28 swinging it on ‘its; trunnion bearing supports on the'gends of themember 24. i ' ' It will be understoodthat there is ‘no binding pressure between the face I2 of the block II and the'plate 28>duevto>the pressure of the springs I 8‘ against! the piston, forcing» it inwardly toward the end block I6, there being-~no-_?uid pressure between the said block I6 and piston. ' ‘ As the vplate 28 is swung upwardly through the raising-of the piston 34 the side links 28 exert a longitudinal pullupon the trunnions of they the'Iendwise pressure exerted thereagainst by the hydraulic ?uidwdirected against the piston I1. Theiupper side of the block 11 also engages the limitinginutof-the upper tie rods 6. ThehaseLI is provided with'a bed plate 48 on which?'s. mounted, for limited endwise displace merit, a frame 4.‘! which has longitudinally spaced vertioal?angesnn and 49... A cylinder 50 is se cured to the .outward. face of the ?ange 48 and operatingin said. cylinder. is a piston 5|, the plunger..52.-of which .extends through a suitable packing .boxin the ?ange 48. A ram-i 53.:is. secured in_the.end of the plunger‘ and extends through‘ an ori?ce in the ?ange 49 andslidablyengages .a tubular liner 54 mounted 'ina cylindrical?anged spacing member 55 se curedi tdthe. flange .49.. A chute i?gextending. ,-_from ‘a suitable hopper‘ containingethe, powdered plastic material, enters‘. ,‘ltheggspacer;and;_;liner;intermediate/poi its length . ‘and feeds the material into thellinenin frontof thereby-pulling the die momma-ma by the block- I ‘ the ram 53. block 8, thereby sliding the block, and the die block carried thereby} toward: the abutment,_ 8 away-from the (die lblocklc'alrried by the block a ‘I, so that the faces of the dies are separated a ' su?lcient distance to allow the articles molded with thedies to be moved clear ‘or the‘ dies_.l The slidable block 8 is provided with a trans Abylinder. 51, .surroundedby a heating mem ber 58, is coupled to the end of the cylindrical “spacer member‘ 55~by a grooved clamping ring 58; 'a bushing 58 being interposed between the end of lthe=_lfinery~§4‘ and the cylinder.’ verse slot _4I in which is mountedQaf‘knock-out” ~ The construction _of the heater cylinder “does bar. 42 which is provided with suitable. pins extend- ~ not form‘p'art‘of this_..,invention but the surround- ’ inglthrough theblock 8' to push‘the molded'ar 75. ing heater i‘proyides ‘a temperature ‘which’ serves 2,408,911: ' 6 5 to plasticize the material forced through the bore thereof by the operation of the ram 53, and the- ' more-or-less ?uid plasticized material ?ows through the central opening of a nozzle 60 which is bedded into sealing contact with a recess 1 the die mounted on the block ‘I. v - It will'be noted that the hydraulic pressure ings and joints are not operated- under pressure, but ‘after the toggle has been 'closedpressure is applied hydraulically by the introduction of the hydraulic-?uid through the port 2| to iorcethe piston 11 andits connected parts‘ to apply the pressure directly through the locked toggle to the die block. - It will be noted that the cylinder 35 is mounted applied to the outward end of the piston 5| on horizontal pivots so that the cylinder swings through the port 6| in the end ?ange of the cyl inder 50, is directly opposed to the hydraulic 10 freely in a vertical plane in raising and lowering pressure applied to the die block through the piston ll arranged in the abutment 3. the toggle. ‘ the die blocks, and in order to obviate this and as indicated in Figure 3, and by the operation of ' The plungers 62 of these cylinders 61 are con nected to lugs 63 formed at either side of the trolled valve is opened to admit hydraulic pres- ' It will be readily understood that contact mak The operation of the plunger piston for inject- » ing and breaking'devices may be arranged at vari ous parts of this mechanism to operate relays ing the plastic material into the mold will be controlled by suitable switches to follow im 15 'for the control of suitable time-controlled valves so that the sequence of operation will follow in mediately after the application of pressure to the the proper order and with the proper timing. ' dies through the piston l1. Assuming that the desired dies are properly With the endwise pressure exerted against the secured in position on the die holders 1 and 8 plastic by the plunger. it has the tendency to force the cylinder, the spacer member and the 20 and the dies have been brought together face-to face, the plate 28 will be in a horizontal position, heating cylinder 51 away from its contact with a valve hydraulic pressure is'admitted through the consequent leakage of the plastic around the the port 2! to apply pressure back of the piston nozzle end of the injection cylinder, I provide a pair of hydraulic cylinders 6] arranged at either 25 H and thereby force the die blocks together. Immediately following the application of this side of the spacer member and connected to the hydraulic pressure against the dies a suitable vcon ?ange 49 of the frame 41. sure through the ports 6| to the cylinder 50. A block ‘I. ' 30 quantity of plastic material will have been de-' posited in front of the plunger 53 through the 'Hydraulic pressure is directed into the ends of hopper chute 56, and the movement of the plung the cylinders 61 closest to the block ‘I through er forces the charge of plastic material longitudi conduits 54, and the pressure directed thereinto nally into the cylinder 51 of the heater, forcing operates against pistons carried by said plungers within the cylinders 6| to create a direct pull 35 a charge of the plastic material previously fed into the heater out through the nozzle 60 to ?ll upon the plungers 62 and the block 1, holding the die cavities. ' ' the block ‘I and its die in close engaging contact Hydraulic pressure is constantly applied to the ' with the end of the heater cylinder nozzle.‘ cylinders 6| so that the die block carried by the Suitable switches and levers are arranged in a panel 65 on the side of the base‘ | to effect the 40 holder 1 will be held tightly against the nozzle 66 to prevent leakage of the plastic material. " necessary control for starting and stopping, and At the completion of the stroke of the piston 5| suitable valves and other devices are arranged and its plunger 53 suitable valves will be auto within the :base I for controlling the time period of movement of the different elements. ' matically operated to connect the ports 66 at the i A machine constructed as described is found ~ — inner end of the cylinder 50 with the hydraulic to be extremely e?icient in operation. A very high pressure is exerted by the main injection plunger 53 and this pressure is expended in one direction centrally against the die blocks but the pressure in the cylinder tends to force the cylinder and the injection nozzle away from the die blocks. This tendency is overcome by an opposing pull exerted by'the plungers in the ~ cylinders 65! which are attached to the frame carrying the main cylinder and their plungers are connected to the block ‘I as described. Thus a pull is exerted in one direction on the block 1 to counteract the pressure against the block. ex erted through the injection plunger. ' This equalization of pressures eliminates the necessity of. ?ne adjustment in the setting of ‘the main plunger cylinder and its connected parts and also avoids the necessity of providing ex tremely heavy main frame structures. The ‘pressure applied to the meeting die blocks through the operation of the piston ll arranged in the abutment 3 is transmitted from the abut ment 3 to the ?ange 5 and substantial equaliza tion occurs through the pull in the opposite direc tion exerted upon the block 1 by the plungers in pressure supply and to open the port 6| to ex haust, thereby reversing the travel of the piston 5| and the plunger 53. Following the operation of the valve to e?ect the return movement of the plunger 53 the valve controlling the pressure through the port 2| against the piston I‘! will be closed and the pres sure allowed to exhaust. Immediately following the release of pressure . against the piston ll hydraulic pressure is di rected through the port 39 to the bottom end of the cylinder 35 to force the piston 34 therein in an upward direction, operating the hinged plung er 33 to swing the plate 28 upwardly, and simul taneously operate the toggle links 29 to pull upon the block 8, sliding it on the longitudinal tie rods and separating the die blocks. The movement of the block 8 effected by the operation of the toggle brings the “knock-out” bar 42 into contact with the adjustable rods 44, and the movement of the bar 42 is arrested while the block 8 continues to move, thereby forcing suitable “knock-out” pins connected to the bar 42' or engaged thereby to push the molded arti cles out of the die cavities from where they will fall into a suitable receptacle. the cylinders 6|. Upon the completion of the upward stroke of The arrangement of toggle mechanisms herein the plunger 33 and the operation of the toggle and described is extremely important. As the toggle the block 8 the flow of pressure ?uid through the operates freely through the manipulation of the vertical plunger 33 in the cylinder 35 the bear 75 port 39 is closed and the port is open to exhaust, 2,408,811. while1,-simu1taneo.usly the 7 8 , port 40 leading to the, a top of thecylinder is open to the inlet ‘of a pres suret?uidand 1the;plu,nger'33“is ~moved :dOWl'lm _. draulicmeanspivotally connected to and extend-, lug-substantially right angularlylrom- said strut ' = platejor raising» andv lowering. said toggle to move”. wardly, ‘ therebynswinging theeplate' "28s- and the». thatoggle-connectednie from» and‘ to themating ' ~ toggle‘links downwardly: so that-the block ,8 is: in moved ‘horizontally ;to I bring-the - .1 dies- carried. -> thereby back into face contact with the dies ,carr- - ried ‘bythe block 1. to swing; in- a vertical‘plane havinghollow trun-i , Inthe meantime. the ?ow of pressure ?uid to the, vplunger cylinder 50 ' has been automatically discontinued on the completion of the return 3. In a machine asnclaimed in claimv.2,va ~hy-a draulic, ,cylinder .-mounted on\ horizontal - pivots '10 strokelpf the plunger, and when the plate 28v has beenswung downwardly. into ‘contact with the, faceJZ of the block _II the pressure is again an-. tomatically-applied to the piston I‘! while pressure. is discontinuedthrough theportAUto the plunger. . 33. It will be readily appreciated that numerous formsof-control devicesin the formof relays, nion-pivot'supportaa port leading from onehof.‘ saidwhollow trunnions’to the bottom end of said, cylinder-,e porteleadinggfrom the other of said trunnions to the?topiof ‘said cylinder, gandoa. plungerv ‘mountedtin said cylinder . and . pivotally connected atits upper end with thelockingstrut ‘ plate-‘piyotally connected with the hydraulically operatedsmember in said abutment. 4. A plastic molding "machine, comprising ,a , base; an abutment-mountedat one end voil-said base, ,a ?ange rigid-with-said base spaced from switches and .valves may .be-utilized to accomplish 20 saidrabutment, horizontal tie rods extending‘ from;v the sequence of operations of‘ the various elements.’ 'said;abutment to ‘said-‘?ange, a die block holder, > of’, this. machine, as has been herein described.‘ mounted on. said, tie ,rodsadjacent to said ?ange. , In the operation of a machine-such as described it is sometimes found necessary to clear the in: jection nozzle of plastic material which may flow 25 therefrom. during the periods when the pressure ‘ maybe relieved and in orderto accomplishthis resultthe hydraulic pressure to the cylinders 6| may be reversed, sothat the-plungers will be forced a die blochholdenslidably mounted on-said tie, _ rods‘between- the aforesaid holder and said abut-g. ment,‘ a horizontally movable-hydraulically oper_- I atedimemberr mounted in said abutment, toggle - links connecting said hydraulically operated _ member, with said slidable: die block- holder,- a rigidlmember extending _from the toggle member.‘ outwardly to move the die holder 1 in the direc-v 30 connected to said hydraulically operated member; ,1 tion of the die holderB, while thetoggle is raised, and adapted to engage in looking contact with thereby. moving the block _1 andits‘die clear of v said slidable die-block holder toform a, rigidstrut the ‘injection nozzle 6 and. permitting access therebetween,- and mansion operetinesaid rigid. . thereto for cleaning‘ or repair. . What ,Iclaim as my invention is;v locking ,imeinberito - ?rst clear- the rigid member - > 35 ‘from-Flocking contact‘with‘ the die block holden; 1. In a plastic molding machine, the combina- 7 thenrnoving said; dierblockl holder’ longitudinally > tion with a pair of separable dies, of, toggle links: on-saidltielrod, and then returningthe die block connected with one of said dies to move same to holder andjlocking sameprior to the application ward and fromthe other of said dies, a strut plate . of, compression pressure by, said hydraulically separate from said toggle links’ adaptedto be '40 Operated. members ~ moved without compressive pressure .to engage-v and lock the toggle operated die, hydraulic means 5.,Aplastic molding injection machine, com» prisinga base, an injection cylinder plunger and a arrangeduin angular relationtosaidstrut plate a to move same into- and out of. lockingposition,v heating,cylindenconnected, therewith mounted on pressure directly to said. strutrplaterand die fol- V. lowing thecompletion. of therclosingamovement . of said strut plate and toggle links. . and arranged-one at either-side of said injection cylinder, .plungersmounted in saidpair of hy said base, a diehqlder movably mounted on said and hydraulic means’ for-applying- compressive. 45 base; a pair of ‘hydraulic cylinders mounted upon draulic. cylinders rigidly connected to said mov 2. In a plastic molding machine, v‘the combina ableidie vholder, means for directinghydraulic tion with a pair of separable dies, of togglelinks '50 ?uidpressure into said pair of cylinders to oper pivotally connected to one of said dies, an abut ate, said plungers to exert, a pulling force between; ment arranged in ‘opposed relation to the latter,‘ saiddnJ'ectionCyhnder andsaid die block'in op die, a hydraulically operated member mounted in position to the vpressure exerted against the! die saidabutment, toggle links pivotally connected to bloclgby the ram of the injection-cylinder, a die said hydraulically .operated member and.piv_-,_ . 55 block movably'mounted to and from engagement , otally connected to the aforesaid toggle?links' with,.the aforesaid .die block, means for moving a rigid, strut plate carried by the togglelinkcon- .. the latter die block toand from engagement with nected to the hydraulically operated memberar the. aforesaid dieblock, .and ‘means for exerting, ranged to engagein locking .contactfree from. hydraulic pressure against said movable die block endwise pressure _ between the .die, connected to 00 in oppositionto the pressure exerted thereagainst said‘toggle and said hydraulically operatedmeml-y- . ‘by the-‘operationof the injection plunger. ber-to form a rigid strut therebetween, and hy: ARTHUR A. BURRY.