Патент USA US2112343код для вставки
Marc'h 29, 1933. N. LES-naa»` ET AL 2,112,343 `> PRESSURE CASTING MACHINE Filed July :5, 1935 2 sheets-sheet 1 28 29 Y INVENTORß fía' Íáaw feáíeff fw ¿mikem/17( (655er H7 @ÚM/¿uk v 9 ATTORNE 6. ` March 29, 1938. N_ LESTER ET AL 2,112,343 PRESSURE CASTING MACHIN. Filed July 3, 1935 % m... xx., Y5 .4` 2 Sheets-Sheet 2 _ _=‘|»=Í\¿d/. =/`|> 4 95 e o 8 R» ,à z. 4 / ‘ „ „,„fß.„w«amy_ fà A\ _\ \/m %/\ÍW f_//,\/7\/\ _MM A. oJ I „uf INVENTORJ Waffle” £65 17er 414 @wát Mal/¿L4 «a @auf ' ATTORNEYÖ 2,112,343 Patented Mar. 29, 1938- UNITED STATE s - PATENT , 2,112,343 OFFICE d vPRESSUREcastano. MACHINE ` » Nathan Lester, Cleveland Heights, Ohio, and‘Wil `liam M. Lester, Leominster, Mass.,- assignors to Lester Engineering Company, Cleveland, Ohio, a corporation of Ohio Application Julyïa', 1935, serial Navzassa 1c claims. (ci. .c2-ss) The present invention relates to an apparatus l Now referring more particularly to Fig. 1, the for casting metal under relatively high pressure pressure casting 1machine shown therein consists wherein a charge of metal is forced from a pres- of a supporting base I carrying the horizontal tie sure chamber into a permanent mold cavity de- rods 2, the end tie plate 3„and the upper tie rods fined by a pair of separable die blocks. The general object andnature of theinvention is to transfer a measured charge of metal, sufli- l (only one each of the tie rods 2 and l being shown). A die plate 5 is carried by the right hand end of the tie rods 2 and l, or upon the cient to completely fill the mold cavity and gate, -from a melting pot, to a pressure chamber, and ` to eject a quantity of metal therefrom into the mold cavity without exposing such metal to the atmosphere and without entrapping any air or end opposite to that of the tie plate 3. A movable die plate 6 is also carried upon the intermediate portion of the tie rods 2 and `I. The die plates 5 and 6 are adapted to carry the die blocks 1 and 8 respectively, whose opposed faces define a mold 5 air bubbles in the casting charge. cavity 9. chamber. Another object of the invention is to provide a measuring plunger adapted to vary the volume capacity of the pressure chamber and to maintain the casting charge in a compact mass until it is in position to enter4 the mold cavity. A further object is to provide means for auto- carried upon the movable Plate l2 by means 0f a screw ‘jack mechanism I3 whereby the position of the die plate 6 with respect to the movable plate I2 may be variably regulated. The last described mechanism for actuating the die plate 6 is not claimed as novel in the present invention, matically‘regulating the position and movement of such measuring plunger. since it is embodied in the subject matter and explained in detail in the copending application 25 Still another object of the invention is to provide a melting pot and furnace structure which can be quickly and` easily removed and replaced from the casting machine assembly. Additional of William M. Lester, Serial No. 5,438, flied Febru ary 7. 1935 , A pressure Casting Chamber 0r Cylinder l5 1S mounted in the> die plate 5. A pressure plunger A further -object of the invention is to provide means for ejectlng `surplus metal or solidified 15 g“slugs” from the charging chutethrough which the molten metal isv transferred into thev pressure i25 , v objects and advantages shall become apparent I6 enters the right hand end of the casting cyl during the following description. lnder I5 and is connected to the piston rod I1 o To the accomplishment of the foregoing and related ends, said invention, then, >consists of the means hereinafter fully described and par35 . Toggle link mechanism indicated generally-by the numeral I0, together with the hydraulic ac 15 tuatlng cylinder II, connects the end tie plate 3 to the movable die plate 6. The die plate 6 is 0 leading to the hydraulic pressure cylinder I8. Flexible connections I9 and 20 communicate with the interior of the pressure plunger I6, which yis ticularly pointed out in the claims. ¢ hollow and are for the purpose of circulating a The annexed drawings and the following de- cooling medium Such as water or oil within scription set forth in detail certain mechanism embodying the invention, .such disclosed means the interior of the plunger I6. The hydraulic cylinder I8 is mounted upon the base I by means constituting, however, but one ofk various ‘me- of a supporting bracket 2|. ’ A charging Chute 24 leads from the pressure 40 casting cylinder I5 to the metal melting pot 26. The melting pot 26 is in turn mounted in a. heating furnace `structure 21. The melting pot 26, the heating furnace 21 and its housing 2B is mounted upon the supporting rollers 29 whereby the melt ing pot and furnace can be rolled laterally, that is, in a direction normal to the plane of Fig.v 1, from under the casting machine, merely by re moving the charging chute 24. In this manner, a melting pot and furnace which needs repair 50 may be very easily removed and replaced in posi tion with respect to the casting machine, or the melting pot and furnace containing a different composition of metal may be conveniently sub tion betweenl the measuring plunger shaft and 55 stituted when desired. chanical forms in which the principle of the in1 In said annexed drawings:-.Fig. 1 is an elevational view in section of the assembly of the machine embodying the principle of our invention; Fig. 2 is an enlarged sectional 45 view ofthe charging chute and pressure chamber taken upon a plane normal to that of Fig. 1 and substantially «along the -line v2--2 thereof; Fig. 3 illustrates an alternative form of construction for the parts shown in Fig. 2; Fig. 4 is an enlarged fragmentary sectional view taken upon `a plane normal to that of Fig. 1 and substantially along the line 4-4 thereof, showing the connec 40 vention may be used. the auxiliary resistance shaft. 2 »guasta ' The upper- portion SII of the charging chute 2| has a recess for the reception of the rectangular exterior wall II of the pressure cylinder Il.- A transverse shaft l2 meshes with a gear rack II removable cap_32à holds the charging chute por tion 3l in position with respect to the'ca'sting ingbosses Il and Il extending from the die plate i and themovable plate I2 respectively. y cylinder Il. Suitable studs 33, Il fasten the cap 22 to the face of the charging chute portion Il. The upper end of the cha?giug‘chute' pamage 2l intersects and' communicates with the interior ol 10 the casting -cylinder II, as indicated at Il. Fior-the purposesvof convenient fabrication, and machine practice, the rectangular cylinder housing 3i may be made into two-.pieces Joined together> along the lparting line Il in the same 15 plane as the arial center of the charging chute passage. ~ A vacuum passage ß leads from >the upper end of the charging chute passage 2l ~to the port 21 which in turn is connected to the vacuum on the end of the auxiliary shaft I4. Theaux iliary shaft Il is carried by downwardly project ' It will thus be seen that the measuring plung er shaft II and the- auxiliary shaft Il are so connected'by the cross shaft l2 that movement of either one in a given direction will be transmitted into movement of the other in an opposite direc tion. For‘example, when the measuring plunger Il and its shaft il are moved in a left hand direction with respect to Fig. 1,- the cross con necting .shaft I2 will be rotated in such a direc tion'. as to transmit the left-hand movement of the shaft II into a right-hand movement of the is shaft M. f The _left hand end of the shaft I4 is connected to the,adJustable,_ threaded spindle or shaft Il' 20 conduit 38. The vacuum conduit 3l leads to a. “hy-means of the sleeve `Il and a friction pack-4 vacuum pump or motorV (not shown). l`The vac ing gland composed of the bushing I2 and the uum passage 33 is of cylindrical form and 'a friction packing material Il.y 'I‘he shaft l0 plunger or piston il is mounted therein. The upper end of the piston 39 carries a gear rack III adapted to be engaged by the gear segment 4I on the end of the lever 42. Thevlever l2 is pivoted at the point 43 and carried by the hous threadably engages an internally threaded sleeve I4, the latter being fixed to the base I. The outer _end oi' the shaft il is squared as at Il for the’ reception of a suitable rotating tool or wrench whereby 4the position of the shaft l0 ing‘ Il which in turn is threadably mounted as may be adiustably regulated with respect to the at“` to the upper end of the charging chute 24. fixed base I. " ' The housing Il alsoserves as a guide for the The operation'` of the -automatic measuring. reciprocal movement of the enlarged upper end plunger Il4 ' and' its i above describedf connectingy 46 of the piston II. A connecting rod 41 connects ` the >outer end of the lever 42 to the movable tie',` when the v«casting cynnder- unis nues with plate I2. Thus movement of the die plate t and - molten metal by -the- action of the vvacuum ¿mechanismlisas'follov'o's:-` 435 40 ' ' l " l so` Í ' of the movable plate I2 operates `to oscillate the vthrough the passage irland through the charging lever 42 about its 'pivot point vß and to thereby chute passage 2l, the pressure -plunger Il is raise and lower the piston 39. `When the piston then moved in a left hand or dischargingv direc 39 reaches its uppermost position, fas’ shown in ` tion. Compression of the metal charge in the Fig. 2, the vacuum passage port 31- will be opened cylinder Il tends to force the measuring _plunger andthe vacuum placed in communication withthe 50 in- a left hand direction, or outwardly with re charging chute passage 25 and the interior of the spect to the cylinder II. Such left hand move 40 casting cylinder I5.- On the, downward movement ment of the measuring plunger Il and its shaft of the piston 4*39,„the vacuum passage port l1 II is transmitted through thefcross connecting will be closed and?> continued downward move shaft 52 to the auxiliary shaft 5I. tending to ment will extendï'the piston 38 into the vacuum..v draw the latter in a right hand direction. But passage> ,3Q and the> upper end of the charging the right hand movement of the shaft M is re 45 `chute passage „2B-whereby excess- metal which sisted by virtue of the friction packing Il in the might have‘frozen out in the upper end of the ` sleeve 6I. In this manner, the left hand or 'out 50 passageßïjand in the passage 36 will be forcibly ejected and dropped back into the melting pot 26. For the Vpurpose of conveniently removing and replacing the charging chute, the alternative form of construction as shown in Fig. 3 may be 4ward movement of the measuring plunger 80 with respect -to the lcasting cylinder Il is resisted, but the pressure exerted ybythe pressure plunger Il is suñlcient‘to overcome such’resistance until thev shoulder“ on the >measuring plunger Il employed. In Fig. 3,'the charging chute ismade _. abuts against the >face of> the die plate 6. At 55 in the form of a separableelement 24' .which threadably engages the housing 30’ as at Il. A hexagonal portion 49 on the outer surface of-the charging I chute 24' is for the reception of a wrench whereby the chute 24’ may be conven iently screwed on or unscrewed from the hous ing 3U' Y - Directingl attention to Fig. I, a measuring plunger B0 extends- >through the die blocks 1 and l and is adapted to enter the left hand or discharge end >of thecasting cylinder I5. The end oi.' themeasuring plunger 50 and the end -of the pressure plunger Il thus define end walls in the pressure cylinder I5. The left hand or outer end II of the measuring plunger 50 is 70 journalled in the movable die plate 6 and has a gear rack which meshes with the‘gear teeth on the transverse shaft 52. The shaft 52, as will be best seen in Fig. l, is lournalled in a re cess in the die plate 6 and held therein by 75 means of the cap screw 53. -The lower end of the this point the right Íhand-.end of the measuring 55 plunger.“ cleare'dit‘he sprue opening B‘I'to the'moldcavity ‘9, as indicated by the dotted line 08 and, further movement of the pressure plung er Ilforces the metal charge into the mold cavity 9. At the next stage of operations, when 60 the movable die plate 6 is moved in a left hand direction in order to open the die >blocks 1 and 8. such movement _will tend to rotate the cross connecting shaft l2 inra counterclockwise direction as viewed in Fig; 1; but since the shoulder 65 I6 abuts against the face of the die plate i, such counterclockwise rotation will not be possibleand the shaft 52 will therefore become locked, with,the result that the position of the shaft Il' with respect to the movable die plate l is 70 also locked. Hence left hand movement of the ydie ~,plate I, due to the locking of the cross shaft 52 will be transmitted into left hand move ment of the shaft 54, into the space 69 between its left hand end and the end of the threaded shaft 1 9,119,848 i , , p ì ì 3 l‘l. On closing movement of the die blocks 1 and having a meltingpot. 'a pressure'chalnber. for re-- ’0, the resistance exerted by the Afriction packing sure,'and a pressure connectedto said4 chamber for transferring jiluid metal thereinto‘` l, or on right-hand movement of the die plate ceiving and "u will tend to hold the shaft u in place with the shaft Il and measuring plunger Il in a right hand direction.` and back 4 and thereby `move into-its original starting position,v asäf'shown m. `10v Fig. 1. i 4 « , ' . ` i i ' `In order to variably regulate the initial start ing position of the measuring plunger Il, and . incidentally, of course, to vary'the volume capac ` ity of the cylinder Il, the position ofthe thread iluid metal >under _pres from the melting- pot', the combination of means the result’that the cross shaft „will be rotated ina clockwise direction with respect‘to Pig. l'. , A for electing excess metal from said passage back ' . luto #sid Bie-111118 90h» r l 2.,In a pressure. castingmachineof the'type having a melting pot, ia' pressure vchamber' for „receiving and discharging fluid metal-under pres Vsure, and a pressure 4passage connected Lto. said ’ ' chamber . for transferring fluid metall thereinto` - from the melting pot. the combination of means - for ‘opening‘and closing saidv passage and also. edshaft I0 withrœpecttothenxedbase I is vfor electing excess mctalfromsaidpassage back , 15 ` . varied. Thus, if the threaded shaft IU is moved in a left hand-direction. such movement will _be transmitted through the shaft Il. the cross 'shaft l2 to the :measuring plunger Y“,_withf the 20 result that the latter will move further into the into »said melting „ lmapressurecasting „ „ . i ' ofthe-tm; having ameltlng potpapressure“ 'reim " berfor‘re». ceiving land discharging fluid under pres sure. ‘and a vacuum-passage'connectedto .said ' `castingcylinder Il and >thereby reduce the vol ume- capacity of `the latter. " Gouversely,l right . 25, ` ’ the meltingpot, the combination of means for measuring thel amount of metal discharged from hand'` movement of the threaded shaft “_ lwill move the measuring plimger llin aleft -`hand said chamber, and 4means >for electing excess direction or outwardly _with respect >to the' cyl , metal from said passage back into ’said melting inder il resulting inagreater' volume-'capacity ` of the latter. In4 this manner, the, metal cast \ `ling charge `received and delivered bythe cast 4,'1na pressure casting machine of _the type , ' having'a melting pot.' a pressure for receiving and dischargingv ?uid'metal under ,pres Asure.,an¢,i a passage connectedto said' quired and demanded. ' ' ' It should be noted that the lower end of the chamber for drawing iiuid thereinto from said/_ ing cylinder I 5 may be adlustably varied fas frei. , charging chute 24 extends below4 thelevel 1I of melting pot, the combination .ofmeans'movable `the metal in the melting pot 2l. `An inert mate Vwenn; ¿the interior orma enamberfrer redsun: » ^ rial yspread over thetop ofthe metal in the the discharge of metal `therefroin‘fand also for " melting pot 2l serves to seal -the metal from lvarying the volume capacityof l‘said chamber, ,35 . for, electing excessmetal fromsaidf j _v ‘ atmospheric contact. Thus, it will'be seen that-l Á and means 4 , the above described pressurev casting machine passage backiniaosaid'meltingpot~` ' 5.'In a pressure'` casting Au_ia'chine of 'the type:` ' `accomplishes the functions and results of receiv having a meltingpot, aj pressure chamber for re-' « ` ing a measured quantity of molten metal from ce'iving and discharging fluid vmetal under 'pres-~_ the `melting pot without exposing the metal to 40 sure, .and a »vacuum passage' connected -to said oxidation by contact with the atmosphere, trans chamber forl drawing ‘fluid thereinto lfrom said fers such measured charge of metal `in la Vcom 'pact body to the opening into the mold cavity. melting pot, the combination of means movable and also elects any solidified or frozen out slug withl the ‘interior of said chamber’ for resisting` into the casting cylinder the discharge of metal therefrom» and also forl 45 45 from thefeed back into the melting pot. Theabove described varying thel volume `capacity of said chamber, and means for opening> and closing saidpassage machine also effects a convenient means for ad and also for electing excess metalìfrom said pas# ' lustably varying the capacity of the casting cyl inder, and correspondingly, the amount of the sage back into said melting pot. 50 , measured metal charge. ` , 6. In a pressure casting machine of the type The above described preferred >embodiment: of ' having a melting pot. separable die blocks vdefin ing a mold cavity, means for openingand clos our invention of course discloses the use of 'vac uum pressure for transferring the molten metal ing said blocks, and a pressure _cylinderand from the melting pot 28, through the charging plunger therein for discharging fluid- metal .into 55 said cavity, the combination'of a secondïphmger chute 24 and to the pressure cylinder II. How ever, it should be equallyvwell understood that carried by one of said blocksy and movable, into an' equivalent pressure means can be utilized and out of the discharge end- of said. cylinder, without transcending-the spirit of the invention. the> pressure generated by said „mst-named plunger being ,adapted to movey said ’second For lexample, instead of a vacuum communicat plunger outward with respect to said cylinder, 60‘ ing with the >upper end of the charging chute l passage 25, the top of the vmelting potfi" could I ` the> closing movement of said blocks being adaptlf be hermetically sealed and a'greater thangatmos-- ved‘to move said second plunger inwardly with pheric pressure introduced therein whereby the‘ lrespect to said cylinder,I and means> for-adjust molten metal would be forced up through the » ably regulating the extent of such inwardmove 65 charging chute 2l and' into the interior ofthe "1. In al pressure casting machine of the type ` pressure casting cylinder i5. . Other modes of applying the principle of our having a melting pot, separable die blocks de ment. . ` l » « fining a' mold cavity, means ‘forïopening and clos ing said blocks, anda pressure cylinder and plunger therein for discharging fluid metal into 70 stated by any of `the following claims or the said cavity, the combination of a second plungercarried by one of said blocks‘and movable into equivalent of such stated means‘be employed. and out of the discharge end of said cylinder, We therefore particularly point `out and' dis l>means for stopping the outward movement of tinctlyclai‘m as our inventionz--said secondplunger at a point where dts end 75 75 >1. vIn a pressure casting machine oi' the type invention may beV employed instead of the one ` explained, change being made as> regards the 70 mechanism herein disclosed, provided the 'means 4 2,112,343 has cleared the entrance lto said cavity, the pres sure generated by said mst-named plunger being ment _of said blocks being adapted to move said second plunger inwardly with respect to said cyl ` adapted to move said second plunger outwardly with respect to said cylinder, the closing move inder, a melting pot, a vacuum passage termi nating adjacent 'the juncture of said chute and ment of said blocks being adapted to move said second plunger inwardly with respect to said cyl of said cylinder, and means for ejecting excess 5 metal from said chute back into said melting pot. inder, and meansfor adjustably regulating the 13. In a pressure casting machine of the _type having a melting pot, separable die blocks defin extent of such inward movement. 8. In apressure casting machine of thetype 10 having a melting pot, separable die blocks deñn ing a mold cavity, means for opening and closing said blocks, and a pressure, cylinder and plunger therein for discharging fluid metal into said cav ity, the combination of a second plunger car 15 ried by one of said blocks and movable into and out of the discharge end of said cylinder, means for stopping the outward movement of said sec ond plunger at a point where its end has cleared the entrance of said cavity, means for resisting 20 the outward movement 'of said second plunger with respect to said cylinder, the pressure gen erated by said first-named plunger being adapt , ed to move said’second plunger outwardly with respect to said cylinder, the closing movement of 25 said blocks being adapted to move said second plunger inwardly with respect to said cylinder, ` and means for adjustably regulating the extent of such inward movement. 9. In a pressure casting machine of the type 30 .having a melting pot, a pressure cylinder and a plunger therein, and a charging chute commu nicatingv between said pot and said cylinder, the ing a mold cavity, means for opening and clos ing said blocks, a melting pot, a pressure cylinder 10 and a plunger therein, and a charging chute com municating between said melting pot and said cylinder, the combination of a secondy plunger carried by one of said blocks and movable into and out of the discharge end vof said cylinder, 15 the pressure generated by said first-named plung er being adapted to move said second plunger outwardly with respect to said cylinder,‘and the closing movement of said blocks being adapted to move said second plunger at a point where 20 its end has cleared the entrance to said cavity, means for resisting the outward movement of said second plunger with respect to said cylinder, means for adjustably regulating the extent of such inward movement, a vacuum passage ter of said cylinder, and a piston movable Lin said passage for opening and closingl the latter, said pistonV being also adapted to eject excess metal from said chute back into said melting pot. 30 4l‘i. In a pressure casting machine of the type combination of a vacuum passage terminating at having separable die blocks defining a mold cav ity, means for opening and closing said blocks, a‘point in alignment with the upper end of said a supporting base, and a pressure cylinder i'or 35 chute and adjacent the juncture of said chutev and of said cylinder, and means for ejecting ex cess metal from said chute back into said melt ing pot. , 10. In a pressure casting machine of the type 40 having a melting pot, a pressure cylinder and a plunger therein, and a charging chute commu nicating between said pot and said cylinder, the combination of a vacuum passage terminating at l the juncture oi' said chute and of said cylinder, 45 and a piston movable in said passage for open ing and closing the latter, said piston being also -adapted to eject excess metal from said chute back into said melting pct. 1l. In a pressure casting machine of the type 50 having a melting pot, separable die blocks de fining a mold cavity, means for opening and clos ing said blocks, a melting pot,_a pressure cylin der and a plunger therein, and a. charging chute communicating between said pot and said cyl 55 inder, the combination of a vacuum passage ter minating adjacent the juncture of said chute and of `said cylinder, a piston movable in said passage for opening and closing the latter, said piston being also adapted to eject excess metal from said chute back into said melting pot, and means operable by .the movement of said die blocks for actuating said piston. l2. In ya pressure casting machine of the type having a melting pot, separable die blocks de 65 ñning a mold cavity, means for opening and clos ing said die blocks, a pressure cylinder and plung er therein for discharging fluid metal into said cavity, and a charging chute communicating be tween said pot and said cylinder, the combina 70 tion of a sec-end plunger carried-by one of said blocks and movable into and out of the dis _ charge end of said cylinder, the pressure gen erated by said first-named plunger being adapt ed to move said second plunger outwardly with respect to said cylinder, and the closing move 25 minating adjacent the juncture of said chute and receiving and discharging iiuid metal into said cavity, the‘combination of a plunger movable into and out of the discharge end of said cyl ‘inder for varying the volume capacity thereof, the outer end of said plunger being slidably sup ported by one of said blocks, a shaft parallel to 40 said plunger, a second shaft having its axis nor mal to said plunger and said first-named shaft, rack and gear means connecting said second named shaft to said plunger and said ñrst-narned shaft whereby movement in one direction of said plunger is- transmitted to movement in an oppo site direction of said ñrst-named shaft, and fric tion detent means slidably connecting said first named shaft to said supporting base, and means for adjustably regulating the position of said fric tion detent means. ' 15, In a pressure casting machine of the class wherein iluid metal is fed through one of a pair of separable die blocks from a pressure chamber carried bysaid one of the pair of die blocks, and a _plunger in said chamber for discharging fluid metal from said chamber under pressure, the combination of means independent of said plung er and carried by the other of said pair of die blocks for varying the volume capacity of said 60 chamber. ` t 16. In a, pressure casting machine of the class wherein ñuid metal is fed through one of a pair of separable die blocks from a pressure cham ber carried by said one of the pair of die blocks, and a` plunger in said chamber for discharging ñuid metal frcmy said chamber under pressure, the combination of means independent of said Yplunger and movable Within the interior of said chamber for resisting the discharge of metal 70 therefrom and also for varying the volume ca pacity of said chamber, said means being car ried by the other of said pair of 'die blocks. NATHAN LESTER. WILLIAM M. LESTER.