US2609575A

US2609575A - Apparatus for pressure injecting casting material by diaphragm pumps

Info

Publication number: US2609575A
Application number: US92752A
Authority: US
Inventors: Louis H Morin
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-05-12
Filing date: 1949-05-12
Publication date: 1952-09-09
Anticipated expiration: 1969-09-09
Also published as: DE816126C; FR1001057A

Description

Sept. 9, 1952 H. MORIN APPARATUS FOR PRESSURE INJECTING CASTING MATERIAL BY DIAPHRAGM PUMPS Filed May 12, 1949 INVENTOR.

LOUIS H. MORIN' ATTO E) Patented Sept. 9, 1952 I NITED; stares ears-N orrice APPARATUS FOR PRESSURE INJECTI NG CASTING; MATERIAL BY DIAPHRAGM PUMPS 7 Louis H; Morin, Bronx, N. Y.

Application May 12, 1949, Serial No. 92,752 v 1% Claims. (Cl. 22- 70) 1 l invention relatesto die casting machines The member l4 forms a cyclinder in which is wherein molten metal is forced, under iiressure, mounted a pistonn, havin 'araisee central porthrough a gopsenck into the cavities ofdies in tion 25 from which extends "a 'rod' 25;"the1a'tter I i Yr ivior 'particularly', the inpassing throughthe head 260i the cylinder; The

veng n deals with casting machines of the char- 5 annular chamber '21 isdesigned' to receive air acterd n d and c'apab ejoi use for the high under pressure, from port 28;as later described. speed iormation of has gs of: aluminum and Mounted onthe rod" 25 is a spring '2 tfth'e ten alurninumallovsl g 1 sion of which is adjusted by nuts 30, "Depending l'henjovel features 0,1 the invention will be best from the head of 'piston 23 is a forlged bearing understood from thejjollowing description when portionti'with which is pivotally coupledja link taken together'with the accompanying drawing 32. Another link '33 is coupled with the 1ink 3'2 in which certain embodiments of the invention and the latter with a link 34 pivoted'to theupper are disclosed, and in which the separate parts are forked end 3;"; of the enlargeddis'c headf'ii'u of a designated by Suitable. reierence characters in plunger 31 each'of the views,andin which: 5 C p w t t l wer d p rti nf "the Fig. 1 is a schematic perspective view eta plunger rod 31' is aspaceror'coupling38 which gooseneck diagrammatically illustrating the coup s .thdplunger 3". with h? pp disc par mounting and Operation of parts thereof, partof tion 39 of a bellows-type pump Q01" The bellows t e 'construetionf' bei g i ger; wai em t itt'eeepum at is iorrned from a" series or ring like tiqn. plates 4| having their-inner and outer edges Fig. 2 v is a vertical sectiorithrorigh the goosewelded togethenth'e'top disc being welded tothe heels, tttd ctt e ttt F 1 and, h n th te t te plate 39, d he o o t 'w te t e disiased in pa of a pot containing molten p1ug' i2; The plug QZ-h'asa drive fit in'a tapered metal; and I v socket 513 in the lower eiid of the goosenec1: bodi' Fig. 3 is a view similar to 2-, showing only llj 'i 1 a part oi the construction andflshowing ariiodilThedisc 39 also includes centrally thereof, a fication. rod extens'io'ri' i lwhichbasses downwardlyand In Fig. 1 (if the drawing, I have illustrated freely through the b'eilows'du'and has arounded schematically; a perspective view' of a goose neck end '45 which operates in a bore 46 iii the plug 42. t associated therewith tomount'and The plug 42 has an'inlet port or ifia'ssage t! in firises a main 19W '.t bu1 ar body "I I having an a ball check valve'lB is emnloyed which controls unwlardl y and outwardly directed discharge spout communication between the'port 4 and bore 45. hef'u p g discharge end of which is The plug 42 has a transverse bore 49 which inmounteda diseha'rge n oazle [3; note Fig. :2. On terseqts the vertical bore 4Q=and which opens inthaunpe i end of the body H is mounted an t to an annular groovefifl in the periphery of the inverte qnshtI @F ee ttee. tt h n m we e ite, h letter t eei t t th t t et sent (and it adapted to be clamped ubon the 119- of the gooseneck extension'or'arm 12. Also comper enjdof the dy l I, as by'means'of the bolt it. municating with the transverse bore 491s a'pair The r permit dft t ember' m has atone qr'verttc t rts 5 2 which open into the interior side a pair i outwardly j extending arms'il 'of the bellows. The plate 39 has an air vent 53 itllmi l a pivotal mounting for the gooseneck to opening into the interior of the bellows, the'air gwtngfgin 'ivot this indicated at iii, in Fig. i of ve e ng Controlled by a hall-valve 54 "seated in the drawing *ljhis: pivotal mounting is provided the lower end of a rod The rod 55 hast, ttt tqvem nt of e. ozz it owar t5 te e tm' tt ie t 56 e' e a a the 'dies' in the operation of injecting adjustable screw 51 is emit-loved to" maintain "the casting material into the cavity of the die. .Beball valve 54 in seated pq'sit iom 'ihus', theqpe'rtweenthe arms ll, the member l4 haste, boss It atin Piston 23 and theconnections to" and' inin which is mounted a screw 20, the lower flanged eluding bellows 49', and associated parts are all end 2! of which engages a forked portion 22 on housed within the tubu1argooseneck body Lil.

the'upper end portion of the body II. The screw At 58 I haveishown a melting pot in 20 serves'to hold the parts or members H and Hi which the lower end "of the goosene ck ll} is ar in adjusted position with respect to each other ranged, suitable meg, is roviddfnpt hown, and this adjusted position 'is defin tely fixed by theclamp bolt is. I

tte .tttettttett't t ete e aid 'gooseneck. The 'goos'enecl' comits lower end which registers with the bore ifi'and aeoaevs which is indicated at 59, at a desired temperature for injection into the cavity of the dies. It will also be noted that the level of the metal in the pot is maintained at a point above the top of the disc 39 and preferably below the lower end of the plunger 31.

To withstand attack, as by molten aluminum, theworking and related parts of the pump, such as disc 39, bellows 40, rod 44 and plug 42, are made of a suitably resistant material, it having been found that tungsten is particularly desirable for this purpose. However, to avoid oxidation on exposure to atmosphere, its use is confined to those parts which are kept submerged; and the intermediate parts, such as spacer 38 and rod 55 are desirably formed of ceramic material, which, at the same time, is able to withstand the high temperatures involved.

Returning now to Fig. 1 of the drawing, I have diagrammatically shown at 60, a cam shaft having a cam 6| for actuating a rocker arm 62 mounted in a suitable bearing 53. At the other end of the bearing is an arm 64 actuated by the rocker arm 62, the arm 64 supporting an'adjustable pin 65 engaging one of the arms I! and by this means the gooseneck is swung on its pivots I8 to the slight extent necessary to move the nozzle [3 into and out of engagement with the dies. On the shaft 60 is another cam 66 for actuating an air valve 61 to control the admission of air under pressure, from inlet 10 and any suitable source of supply, to pipe 68 and inlet 28. Valve 61 is channeled, as at 61', so that when the high point of cam 66 moves on and permits the valve to move to the left (as viewed in Fig. 1) to close off the air supply by way of'inlet 10, pipe 68 will be vented by way of channel 61 and outlet 1 I.

In Fig. 3 of the drawing, I have shown a modified form of pump and in said figure, I 2' represents part of a gooseneck spout similar to the gooseneck spout [2. In this instance the lower end of the tubular body of the gooseneck is closed by a plug 42', which has a short center vertical bore 13 communicating with a horizontal bore 14, the latter opening into an annular groove 15 in the periphery of the plug 42. The groove 15 registers with the port or passage of the gooseneck spout. The plug 42' also has vertical passages 16 placing the horizontal bore 14 in communication with a recess 11 formed in the upper end of the plug and serving as a pump chamber. Cooperating with chamber 11 is'a flexible diaphragm or disc 18, The disc is fixedly supported on a flanged post 19 having a rounded plunger end 80 which operates in the bore I3. At 31' is shown a plunger rod similar to the rod 31 and at 38' is shown a ceramic coupling between the rod 31 and the post I9. As in the previously described construction, the

parts

42', 18 and 19 are composed of tungsten or similar material. r p

In Fig. 3, I have shown a part of the molten metal pct 58', showing-the relationship of the gooseneck spout I2 therewith, as in Fig. 2 of the drawing; It will be apparent from a consideration of Fig. 2, that'the cylinder ll of the gooseneck is open, as seen at 8!, at one side thereof, a similar opening 8| being employed in Fig. 3. This opening allows free-admission of the molten metal into the gooseneck and also renders the parts in the cylinder of the gooseneck accessible,

as will be apparent. With the structure in Fig. 3, it will be apparent that no air valve or bleeder, as at 53 and 54, is necessary and that in the action of the diaphragm pump 18, the diaphragm raises sufiiciently to admit molten metal into the chamber 71 in the various bores and passages and up through the bore 5|, and this metal is pressure injected into the die in the downward movement of the diaphragm or in flexing the same into the dotted line position shown in Fig. 3.

With the construction shown in Fig. l, the interior of bellows pump 40 is completely filled with molten metal by relieving the pressure of rod 55 on ball 54 and permitting any trapped air to escape. The ball 54 is then clamped down tight to sealthe vent 53. Upon admitting air, under pressure, into the chamber 21, by actuation of the valve 61 by the cam 66, the piston 23 is forced downwardly, which motion is transmitted to the bellows unit 40 through the linkage and plunger rod described, and downward movement of the bellows unit will operate to seat the valve 48 and thus force the molten metal, under pressure, through the discharge nozzle [3 into the cavity of the dies. In other words, in each cycle of operation of the casting machine, a charge of the molten metal is introduced, into the die cavity to form a casting. As will be understood, the nozzle 13 is moved toward the face of the die in readiness for the injection of the charge and thereafter is withdrawn from contact with the die. While the movement is slight, the repeated removal of the nozzle from the die between injections minimizes the transfer of heat from the nozzle to the die.

In the Fig. 3 construction, no preliminary venting of the pump chamber is necessary. Otherwise, the operation is substantially as above described.

In both forms, the injection pressure is ap-' plied positively'to the molten metal itself; that is, without any intervening air cushion at the pressure-receiving surface of the metal. And the compressed air used for actuating the pump is applied to a piston operating in a separate cylinder. which latter can be relieved or vented quickly without creating any suction effect on the molten casting metal.

In the formation of aluminum die castings, and here reference to aluminum is to be' interpreted to mean aluminum or aluminum alloys, difficulty has been experienced between relatively movable parts due to the formation of aluminum iron oxide on the parts. The formation of this oxide produces what might be termed an abrasive, which would result in relatively quickwear between the parts, or on the other hand, might also seize or freeze the parts against normal action.

To overcome these objectionable features, I employ a metal, such as tungsten, which when operated in submersion in the molten aluminum, avoids the objectionable features above mentioned, or in other words, is not susceptible to attack. From this standpoint and in a descriptive fashion, the expression of a material capable of withstanding the attack of molten aluminum will characterize materials of the kind under consideration. With my present construction, no real close fitting of parts is essential, but relatively movable parts are employed, and it is desirable to maintain constant and free action or functioning of such parts one with respect to the other.

Having fully described my invention, what I claim as new and desire to secure by Letters Patentis:

1. In a gooseneck for die casting machines capable of casting aluminum, a pump unit mounted in the lower portion of the gooseneck ndsubmergecl inm lt i metal t b is harged from he ecoscnec c y; said. u it mova e m nsv ating the pump unit, said unit having a resilient,

deformable, sheet material memberas the effective pumping element for the molten metal, said member being flexible in the direction of movement of said movable actuating means, said member being in continuous contact with the molten metal and being resistant to the action of moltenv aluminum, and said member being engageable and periodically flexed by said movable actuating means to force molten metal through they gooseneclr;v to be discharged therefrom.

2. In a casting. machine capable of casting aluminum and wherein a gcoseneck is employed mounted for swingin movement in a reservoir of molten metal, the lower portion of said gooseneck being immersed in and in communication with said reservoir, said goosenecl; having a disarcane charge nozzle movable into and out of casting position and spaced from and in communica= tion with the lower portion of the gooseneclc, the

improvement comprising a, sealing member; for

said lower portion of the gooseneck, a yieldable sheet material member supported on the sealing member, means for actuating the yieldable member including a post memberextending substantially centrally of the yieldable member and engageable with the sealing member, each of said members being immersedin the molten metal and being resistant to the action of molten aluminum, said sealing member having a passage- Way connecting the yieldable member with the nozzle so that said yieldable member upon actuation by the actuating means may force molten metal through the passageway to the nozzle, said sealing member also having means for receiving molten metal from said reservoir after each actuation of the yieldable member, and said actuating means also including a ceramic coupling member for connecting the post member with that portion of the actuating means not immersed in the molten metal.

3. In a casting machine capable of casting aluminum and wherein a gooseneck is employed mounted in a reservoir of molten metal, the lower portion of said goose-neck; being immersed in said molten metal, and said gooseneck having a discharge nozzle movable into and out of casting position, the improvement comprising a sealing member in said lower portion of the gooseneck, a flexible sheet material member supported on the sealing member, means for actuating the flexible member, said flexible member and sealing member being immersed in the molten metal and being resistant to the attack thereof, said sealing member having a passageway connecting the flexible member with the nozzle so that said flexible member upon actuation by the actuating means may force molten metal through the passageway to the nozzle, and said actuating means including a ceramic portion partly immersed in the molten metal.

4. In a casting machine employing a goosencck mounted in a reservoir of molten metal, the lower portion of said gooseneok being immersed in said molten metal, and said gooseneck having a discharge nozzle movable into and out of casting position, the improvement comprising a sealing member in said lower portion of the gooseneck, a flexible sheet material member supported on the sealing member, means for actuating the flexible member including a post member exten i g; t u h, the fifiti lanl ni sr and as ble h seal ng member, each of aid l fimb di bfil d, mme sed; 1} 2 163 Q i n, et and b i g res t nt, to; h tt k the Sa d sealing member having a passageway connecting the flexiblemembec \viththe nozzleso that said fiexiblemember upon actuation by the actuating means may forcemolten metal through thepassageway to thenozzle.

5.- n. a t st m chi e e p yi a gooseneck; mounted in a reservoir of molten metal, the lower portionot saidgoosenfik being immersed n molten meta said-" oose ck h vin a d r h rge zzle mo a e, nt n ou o tin position, the improvement comprising a flexible resilient sheet material member supported in the lower portion of the gooseneck, means for actuating said i' lexiblev member to force'molten metal from the reservoir to said nozzle, said flexible member being submergediin themolten metal and being resistant to the attack thereof, and said, actuating means including a ceramic coupling portion atten ing from a point below to a point above thesurface of the molten metal.

6,. In. a tastin ma ne of the, cha a e scribed, the combination of a goosenecl; mounted a for swinging movement-in a reservoirof molten metal comprising aluminum,. the lower portion ofv said g oosfeneck beingimme rsed in and in communication with said molten metal, saidgooseneck having a discharge nozzle movable into and out offcasting position and" spaced. from and in communication with the lower portion oi the gocseneck, a flexible sheet material meme ber supported in said lower portion of the gooseneck, means for actuating the flexible member to force molten metal from the reservoir to said nozzle, said flexiblemember and a portion or" said actuating means in engagementtherewith being immersed, in the molten metal and being formed of tungsten, and said actuating means including a ceramic coupling element for connecting said portion of the actuating means with a portion of the actuating means not immersed in the molten metal.

7. A casting machine according to claim 6 in which the flexible member is a diaphragm.

8. A casting machine according to claim Gin which the flexible member is a bellows.

9. In a casting machine of the character described for castingmetals of relatively high melting point such as aluminum, the combination of a gooseneck the lower; end of which is adapted to be submerged in a reservoir of molten metal, a discharge nozzle on the gooseneclz, a cylinder adjustably coupled with the upper portion of the gooseneck, a piston in said cylinder, a pump unit the lower portion or the gooseneck and normally submerged in the molten metal, said pump uni h ng a flex le e ili n she t m t r me b as the efiec v um n l m n for pumping molten metal to said nozzle, a'plunger rod r ci g h p ton in o er ive n men w h sa d unit the P is. of sa d-u i bein r sistan t molten alumi um, an a eram coup ing lem n to c n e tin s id u it with s i ung r r d t a P int d cent he level of molten metal in said reservoir.

10. In a casting machine of the character described, the combination of a gooseneck mounted for swinging movement in a reservoir of molten metal such as aluminum or aluminum alloys, the lower portion of said gooseneck being immersed in and in communication with said reservoir, said gooseneck having a discharge nozzle movable into and out of casting position, a tung-v aeoatvt sten sealing member in the lower portion of the gooseneck, a tungsten flexible, resilient member supported on the sealing member, said flexible member being deformable to enable it: to be periodically flexed, means including a'tungsten post member for actuating the flexible member by periodically flexing the same, saidsealing, flexible, and post members being'immersed in the molten metal, said sealingmember'having a passageway connecting the flexible member with the nozzle so that said flexible member upon actuation by the flexure means may force molten metal through the passageway to the nozzle, and said actuating means also including a ceramic coupling member for connecting the post member with a portion of the actuating means not immersed in themolten metal 11. In a casting machine of the character described, the combination of a, gooseneck mounted for swinging movement in a reservoirof molten metal such as aluminum or aluminum alloys, the lower portion of said gocseneck being immersed in and in communication with said reservoir, said gooseneck having a discharge nozzle movable into and out ofcasting position, a sealing member in the lower portion of the gooseneck, a flexible bellows member supported on the sealing member, means including a post member for actuating the bellows member, said sealing, bellows, and post members being immersed in the molten metal and being resistant to the action thereof, said sealing member having a passageway connecting the bellows meniher with the nozzle so that said bellows member upon actuation by the actuating means may force molten metal through the passageway to the nozzle, said sealing member having a second passageway connecting the bellows member with said reservoir, means in said sealing member for closing and opening the second passageway during and after actuation of the bellows member, respectively, and said actuating means also ineluding a ceramic coupling member for connecting the post member with a portion of the actuating means not immersed in the molten metal.

12. In a casting machine of the character described, the combination of a gooseneck mounted for swinging movement in a reservoir of molten metal such as aluminum or aluminum alloys, the

lower portion of said gooseneck being immersed in and in communication with said reservoir, said gooseneck having a discharge nozzle movable into and out of casting position, a sealing member in the lower portion of the gooseneck having a chamber in the upper portion thereof, a flexible diaphragm member supported on the sealing member, said diaphragm being disposed over and flexible into said chamber, means including a post member for actuating the diaphragm member, said sealing, diaphragm, and post members being immersed in the molten metal and being resistant to the action thereof, said sealing member having a passageway connecting the chamber with the nozzle so that said diaphragm member upon actuation by the actuating means may force molten metal through the passageway to the nozzle, and said actuating 13. In a casting machine of the character described, the combination of a gooseneck mounted for swinging movement in a reservoir of molten metal, the lower portion of said gooseneck being immersed in and in communication with said reservoir, said gooseneclr having a discharge nozzle movable into and out of casting position, a sealing member in the lower portion of the gooseneck, a bellows member supported on the sealing member, said bellows member being provided with a closed upper end having a vent therein, means for actuating the bellows member, means adjustably secured to said actuating means for closing said vent, said sealing and bellows members being immersed in the molten metal and being resistant to the action thereof, and said sealing member having a passageway connecting the bellows member with the nozzle so that said bellows member upon actuation by the actuating means may force molten metal through the passageway to the nozzle.

14. In a casting machine of the character described for casting metals such as aluminum and aluminum alloys, the combination of a goose? neck the lower end of which is adapted to be submerged in a reservoir of molten metal, a discharge nozzle on the gooseneck, a cylinder adjustably coupled with the upper portion of the gooseneck, a piston in said cylinder, a pump unit in the lower portion of the gooseneck and normally submerged in the molten metal, said pump unit including a flexible, resilient sheet material member actuatable to pump molten metal to the discharge nozzle, said unit being resistant to molten aluminum, a plunger rod for placing the piston in operative engagement with said unit, a plurality of movable links connecting said plunger rod with said piston, and a ceramic coupling element comiecting said unit with said plunger rod at a point adjacent the level of molten metal in said reservoir.

LOUIS H. MORIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATEN'IS Number Name Date 268,513 McKinley Dec, 5, 1882 1,580,479 Frankenfleld Apr. 13, 1926 1,964,324 Korsmo June 26, 1934 2,145,553 Morin Jan. 31, 1939 2,179,960 Schwarzkopf Nov. 14, 1939 2,195,360 Daesen Mar. 26, 1940 2,224,977 Morin Dec. 17, 1940 2,224,979 Morin Dec. 17, 1940 2,273,896 Simms et al. Feb. 24, 1942 2,367,303 Morin Jan. 16, 1945 FOREIGN PATENTS Number Country Date 588,780 Great Britain June 3, 1947