US1469073A - Diecasting machine - Google Patents

Description

Sept. 25, 1923.

N. DOLLIN DIECASTING MACHINE Filed June 29 1921 4 Sheets-Sheet 1 Sept 25 1923.,

E. @& EJCDLLJFQ DIECASTING MACHINE Filed June 29 1921 4 sheets sheet 2 Sept. 25,1923. A 1,469,073

E. N. DOLLIN DIE-CASTING MACHINE Filed June 29. 1921 4 Sheets-Sheet 5 I Mb fir.

Sept. 25 1923.

E. N. DOLLIN DIECASTING MACHINE Filed June 29. 1921 4 Sheets-Sheet TTORNEY connection with the accompanying drawinto and out of registration with the dis-v Patented Sept. 25, 1923..

unit fsrAT s r TENT-p FHCE.

EDGAR N. DOLLIN, 0F SYRACUSE, NEW YORK.

DIECASTING MACHINE. V

To all whom it may concern:

Be it known that I, EDGAR N. Douala, of -g Syracuse, in the county of Onondaga,'in the State of New York, have invented new and useful Improvements in a Diecasting Machine, of which the following, taken in charge nozzle of a conduit containing molten metal which is' forced into the dies by air pressures plied to one end of the conduit.

' ,ent means for counter-balancing and assist--' The mam object is to rovide a more facile, economical and efiiclent apparatus for producing diecastings whereby to greatly increase the output with a minimum 'expenditure of time and labor.

One of the specific objects is to combine the container and' delivery conduit for the. molten metal as a unitary article of manufacture and to install the same in the fire box in such manner that both will be exposed to the more intense heat of the burner or burners for the purpose of not only reducin the material to be molded to a molten state 1n the container but also maintaining and increasing the fluidity of the molten metal which ma be placed in the conduit for delivery to t e dies under pressure.

Another specific object is toprovide means whereb one of the die sections may be auto matical y closed and open upon and from the other die as the carriage is moved to. and from its closed position.

- A further object is to construct the carriage operating means in such manner-as to automatically lock the carriage in its extreme closed and open positions.

A still further object is to provide resili ing in the operation of the carriage particularly in shifting the same from its open to its closed position and to automatically render the counter-balancing means efiective by the storage of power therein during the opening movement of the carriage.

Other objects and uses relating to specific parts of the machine will be brought out in the following description:

its closed position.

molten metalinto the dies.

Application filed June 29, 1921. fierial No. 481,254. 1 I

In the drawings:

Fig. 1 is a top plan of a diecasting machlne embodying 1 invention, the e-carriage {being shown in Fig. 2 is a sideelevation partly: inlsection of the samexmachme as shown in Fig.1, the dotted lines indicating the open posltion of the carriage audits operating means. Fig. 3 is an enlarged transverse vertical sectional view taken online 3-3, Fig; 2.

li lig. 4 is an end view of the same machine omitting the die carriage.

"Fig. 5 is a detail vertical sectional view taken on line 55, Fig.4. As illustrated, this machine comprises a supportlng base or frame 1, a fire box or heating chamber --,2, a combined melting pot and conduit for the moltenv metal mainly within the heating chamber the various features of my 2--, a die supporting carriage -4- and,

operating means therefor for moving the dies into and out of registration"with one,

end of the conduit, and means for supplying and controlling compressed air to-the. other end of the conduit" for forcing the.

. H eater.

The fire box or heating chamber 2. is supported upon the upper face of the base or main frame '-1 .and is provided vvitlri one or more openings .5- for the recep-i tion of gas, oil or other suitable burners (not shown) as the means for supplying heat to I Y the fire box or heating chamber ----2 for:

reducing and maintaining the metal in the combined melting pot and conduit -3 to and in a molten state. This fire box is preferably circular in top plan and is capped by a suitable ring --6 having a downturned marginal flange -7- surrounding the adjacent upper end of the fire box for holding the ring against lateral displacement and permitting it to be removed by vertical displacement.

i i 4 Melting chambers.

The combined melting pot'and delivery conduit 3. is supported: on the cap ring --6 within the openingthereln and mainly within the fire box" 1 also that practically the entire area ofjjfthe melting relatively which is therefor external to the melting pot so as to extend circumferentiallygroup the lower side thereof to expose the ma or portion of its bottom and side Walls toithe heat within the chamber 2-, said conduit bein relatively narrow transversely as oompare with the width of the melting pot or chamber -8.

The melting pot is preferably open at the top to permitthe insertion of the material to be melted therein while the conduit is cut oil from communication therewith by the interposed partition -10-- and has its opposite ends extended above the level pf the melting pot for connection with the dies and with a suitable conduit leading from the source of air pressure supply, which latter is employed to force the molten metal in said conduit through the discharge nozzle when the dies are registered therewith.

The combined melting pot -8- and conduit -9 constitute a-closure for the openingin the cap-ring 6-, the air inlet end of said conduit being provided with an an nular'flange 11-- having a vent opening I2 for the escape of gases from the heating chamber -2 and is provided with. a

seat for the reception of a coupling member 13- by which the air supply pipe as -14 may be firmlyl clamped {by bolts 15 to the adjacent end of said conduit.

Any suitable construction of valve as 16 may be interposedin the connection between the source of air supply and pipe --1 1- to control the pressure in the conduit 9 so that when open, the molten metal in said conduit will be forced by the pressure of the air therefrom into. the

dies when the latter are registered with the delivery end of the conduit.

The molten metal is-taken from the melting pot -8- by means of a ladle or equivalent device and poured into the conduit -9 through its delivery end as -17 avhich constitutes a nozzle having a rounding upper face adapted to fit snugly into and against a corresponding socket in the under side of the fixed section of the dies when the die-carriage is closed to allow the molten metal to be delivered directly into said dies by the pressure of the air in the air inlet end of the conduit, the object in extending the nozzle upwardly beyond the level of the melting pot being to permit the stationary die-section to' be brought into close contact therewith.

The passageway through the conduit '-9- is tapered from the air inlet end to mean-ye the discharge nozzle -17- in order that the inlet opening in the mold may be relatively small and the force of expulsion of the molten metal from the conduit rela-.

tively high.

Die-carriage.

[The die-carriage --4- preferably comprises a vertically oscillating platform --18-'-- and a series of, in this instance four,

posts 19- secured at one end to one end of the platform in spaced relation preferablyat the corners of a rectangle and extending in the same direction from said platform in parallel relation so as to become a unitary\ part of the carriage to move therewith?" This platfornif ends at 20- to'upstanding brackets -21 on the main supporting frame -1- to swing about a horizontal axis some distance to one side of the fire-box 2 and meltpivoted intermediate its ing-pot -8- and in a plane just below the 1 upper face of the cap-ring -6-- to allow the end of the plate 18 carrying the posts 19 to assume a substantially horizontal position when the carriage is closed and also to enable the plate to assume a substantially vertical positionwhen open.

Garm'aage operating means.

on or pivoted to a pair of brackets -27' on the main supporting frame 1 to establish a longitudinally resilient toggle connection between the oscillating carriage and frame of the machine and thereby to assist the opening and closing movements of said carriage.

That is, the flexing joint -92 between the'platform --18-- and tubular members -23- assumes a position some distance above a direct line between theaxes ofthe pivots -20-- and -26- when the carriage is closed, and is moved to a positionsome distance below said direct line when the carriage is open, said tubular members ---23- being slidable lengthwise of and Ill! upon the rods -25 with and against the action of the coil sprlngs -24-.- which are in terposed between the outer end walls -28.

of the tubular members 23-- and suitable shoulders -29 on the inner ends of the rods -25 as shown in Fig. 5. These springs are placed under compression in both the closed and open positions of the carriage to partially counter-balande the weight thereof and to assist in opening the carriage from its closed position and also to assist in closing the carriage from its extreme open position thus greatly reducing the power required for the positive operation of the carriage from each extreme position to the other.

The outer end of the platform -18 is provided with a stud projecting downwardly from the longitudinal center thereof near the pivot --22- for receiving and supporting a cross-arm -'-31-- to which are attached one end of a pair of longitudi nally extending guide-rods -32- in transversely spaced relation and having their other ends secured to suitable bearings 33 on the ..pivotal shaft --20 to swing vertically with the platform 18 as a substantially integral part thereof.

A bell crank lever -34 is pivoted at 35- to the bracket -21 to swing about a horizontal axis parallel with that of the platform pivot 20 and is provided at one side with a pair of arms -36 carrying at the upper ends pivoted heads 36- which are slidable lengthwise of and upon the rods -32- the other side of said bell crank being provided with -a single arm -37- which is pivotally connected at 38-- to one end of a piston rod -39, the other end of said piston rod being movable in a gland 40- in one. end of a cylinder 41- and is provided with a piston 42-'- movable lengthwise of and within said cylinder.

The cylinder 41- extends lengthwise of the machine and is provided with opposite trunnions --43 journaled in bearings 44. in opposite sides of a supplemental support 45 on the main frame 1- to permit said cylinder to swing vertically about a horizontal axis and thereby to conform to the arc of movement of the pivotal connection between the piston rod and lower arm 37 of the bell crank lever -34-.

The piston 42 may be operated in reverse directions by any suitable fluid, such as air under pressure admitted to and ex- 1 to opposite ends of the cylinder, -said branchpipes being flexible to permit the oscilla tion of the cylinder as the carriage is open and closed.

The valve is also provided with an exhaust pipe and an operating lever -51 by which the airi to and from the cylinder is controlled at will tocause' the operation oft-he piston '-42 in reverse directions. 1

Dz'e-opemting-meaxrw.

nected by 'bars 54- to a cross-head 55 1 which in turn is slidable lengthwise of and upon the posts 19-. This cross-head -55- is connected by a pair of toggles --56 to a cross-plate 57-- which is ad-.

justably mounted upon the posts 19 to I regulate the movement of the cross-head -55- and its movable die 53- and is held in its adjusted position by lock nuts 58, each toggle comprising a link 59- and-a crank arm -60- the latter being 5 keyed or otherwise secured to parallel shafts 61- on the cross-plate --5T-. That is. each crank shaft is provided with "a-pair of crankarms --60- on opposite ends 'thereofand each crank arm is provided with a plurality of apertures -'-62- at different distances from the axis of its shaft ,-61- for receiving pivotal bolts 63 and permitting the length of the toggles to be extendedor shortened for varying the amount of movement of the movable die through the medium of its cross-head --55. Each crank shaft is also provided with a pair of gears -62-, those on one shaft meshing with those on the other shaf-t to transmit motion one from the-other.

' An additional crank shaft 63-- is journaled in suitable "brackets on the crossplate '--57- parallel 'with the crank shafts '61- and is provided with apair of pinions -64 meshing with the gears on one of the'shafts 61-. said additional shaft being provided at one end with a hand crank -65- secure-d thereto and having; its free end provided with a handle -66, and a catch 67, which latter is normally engaged with one edge of an arm 68. This arm is journaled at one end upon the shaft --6? in close proximity to the hand crankv65 and has its other end slida'ble in a hub --69- which in turn is pivoted to a stationary brarket -70- on the under side of an I beam -'7 1- or equivalent stationary over-head support.

A clutch member'--72 is secured to one of the gears 62- and is provided with ratchet teeth on oneend face for engagement with-similar ratchet teeth on the adf jacent face of a coaxial clutch member =73-.-, which latter is loose on the adja. cent shaft --'61- and is attached to one end of a coil spring --74- surrounding said shaft and having its other end bearing upon the opposite shaft 61-, said spring being tensioned to'interlock the teeth of the v a loose clutch member -73-- with the opposed clutch member 72 to'exert a rotatmg force upon the adjacent shaft and through the gears -62 to the opposite shaft "v61 and thence through the pina -69 as shown in Fig. 2.

ions 64-- to the hand crank -65- tending to hold the catch 67, in engagement with the arm -68- at a point between the shaft -6? and journal. bearing of the hub 7 closed. the catch -67 is normally engaged with the upper edge of the arm -68- so that when the carriage is open by the operation of the piston '42- and its connections with the carriage 18, the end of thearm 68 carried by the shaft 63- will be rocked downwardly and outwardly and by reason of its engagement with the cat h 67 will cause a corresponding turning movement of the hand crank and shaft 63- toimpart similar rotary motion to the gears --62 through the medium of the pinions -6et thereby rocking the crank arms --60 in opposite directions to open the movable die supporting plate through the medium of the links 69 as shown by dotted lines in Fig. 2.

It is sometimes necessary to close the movable die against the stationary die when the carriage i-s in its extreme open positlon to retain in place an extra loose die member during the closing operation of the carriage and in order that this may be conveniently accomplished,-the' hand crank -65-is made sufiiciently resilient to permit its free end to be withdrawn laterally a sufficient distance to disengage the catch -67 from the arm -(58, whereupon said hand crank may be rocked in the properdirection for rotating the pinions 64:- and gears -62? assisted by the unwinding tension of the coil spring 'M to close the movabledie against the fixed die through themedium of the toggles 56 while the carriage still remains in its full open position, as shown by dotted lines in Fig. 2v at which time the piston 42- will be at the extreme right hand end of the cylinder 41,Fig. 5; the guide-rod 32 will be in a substantially vertical position below the shaft --20-- with the slid eeaovs-l: a I

inghub 37- on the lever-34 at the lower end of the guide-rod-v -'32 and opposed to the pivot -35- to lock the carriage in its open os ition, while the coil spring: 24- will placed under relatively hig compression.

Then by adjusting the valve controlling lever 51 tothe proper position, compressed air will be admitted to the right hand end of the cylnder -41 Fig. 5 to force the piston -42- to the left, thereby rocking the lever -34- and causing the .hub 37- on the lever arm --36-- to s ide -32-- and carriage -18 to assume a sub-- stantially horizontal position with the relatively fixed die plate in contact with the nozzle -17- in which position, the carriage will be locked by the substantially vertical position of the lever arm 36 directly over the pivot -35'.

Duringthis closing movement of the car: riage, the pivotal connection 22 between said carriage and the tubular member -23'is moved through an are about the axis of the pivot --20 from a position some distance below to a position some distance above adirect line between the pivots 20-. and

',26', thereby allowing the springs -24- to expand and to exert, their expansive force in assisting the closing operation of the carriage, while at the same time, the arm '-68-- which was previously in a substantially vertical position will be caused to slide through the hub -69 and to rock about the axis 'of the pivot of said hub which in turn will cause the pivotal connection 63 between the arm -68 and cross-plate -57--- to swing'from a position some distance to one side of a direct line between the pivots 20 and -69'-- to a position. some distance to the opposite side of said direct line.

lhe ratio of the gears -62- and 64- is such as to cause the opening and closing movement of the movable die by approximately a quarter revolution of the gear 82 and substantially a half revolution of the hand crank -65, and when the carriage is being moved from its extreme open position to its extreme closed position with the movable die substantially closed by the operation of the hand crank 65 in the manner previously described, the latter will of course, remain in that position during the closing operation of the carriage with the catch --67-- in the path of movement of a cam face 67 on the, arm 68 so that as the carriage continues to close, the catch --67 will ride across the cam face 67 and assume a position at the opposite side of the arm --68, as shown by full' lines in Fig. Qready for the opening movement of the carriage, the toggle levers 56- being adjusted to straighten when the carria e is closed to lock the movable die in its 0 osed position against the fixed die.

The tension of the coil spring 74-- may be increased at any time b theapplication of a spanner-wrench to t e clutch section -73--.

What I claim is:

1. In a casting machine, of the character described, the combination with a delivery nozzle for the molten metal, a die supporting carriage pivoted to swing to and from said nozzle and means including a spring adapted to be. placed under tension during the closing movement of the carriage to exert its power in assisting the opening movement of the carriage.

2. In a casting machine of the character described, the combination of a delivery nozzle for molten metal, a die supporting carriage pivoted to swing to and from said nozzle and means including aspring placed under tension when the carriage is moved to its open position for exerting its power to assist in closing the carriage.

3. In a die casting machine of the character described, the combination ofa delivery nozzle for the molten metal, a carriage movable into and out of registration with said nozzle, sectional die mounted on the carriage and movable "therewith into and out of operative connection with said nozzle, means for operating the carriage, additional means for moving one of the die sections away from the other as the carriage is open, and including means whereby the relatively movable die section may be closed at will upon its companion section.

4. In a casting machine of the character described, the combination of a delivery nozzle for molten material, a die-supporting-carriage pivoted to swing to and from said nozzle, means for operating said carriage, a stationary bearing and resilient tog gle-connections between said bearing and carriage.

5. In a casting. machine of the character described, the combination of a delivery nozzle for molten material,- a die-supportingcarriage pivoted to swing to and from said nozzle, means for operating said carria e, a stationary bearing and resilient togg econnections between said bearing and carriage having a flexing joint movable across and beyond a direct line between the carriage-pivot and said bearing.

6. In a casting machine of the character described, the combination of a delivery nozzle for molten metal, a pivoted die-carriage movable toward and from said nozzle, a sectiona-l die mounted on said carriage, means for operating said carriage, a die-supportingplate mounted on the carriage and movable toward and from the axis of movement thereof, a relatively stationary bearing, and connections between said stationary bearing and carriage for moving said plate in reverse directions as the carriage is open and closed.

7. A casting machine comprising in combination a pressure chamber, a nozzle, a sectional die, a pivoted die carriage in which said sectional die is mounted, having at one end a guideway slidably engaged by a crank member mounted on a rigid bearing, means for reciprocating said crank member on said bearing whereby said crank member is moved back and forth along said guideway, causing saiddie carriage to swing in and out of engagement with said nozzle and holding the same in rigid engagement with said nozzle during the casting operation.

8. A casting machine comprising in combination, a pressure chamber, a nozzle, a

die, a pivoted die carriage in which said die is mounted, having at one end a guideway engaged by a, pivoted crank, which when reciprocated causes the die carriage to swing from the casting position in engagement with said nozzle to a position out of engagement with said nozzle, said crank also acting as a means of locking the die carriage into engagement with said nozzle.

9. A castingmachine comprising in combination a pressure chamber, a nozzle, a sectional die, a pivoted die carriage havin a stationary die plate to which is attache one part of said die and a'movable die I 'plate to which is attached another part of said die, means for moving said movable die plate nd a stationary bearing eo-operative therewith, so that when said die carriage is swung to and from the nozzle the movable die late is moved to and from the stationary .die plate.

10. A casting machine comprising in combination a pressure chamber, a nozzle, a

sectional die, a pivoted die carriage havin a stationary die plate to which a part 0 said die is attached and movable die plate to which is attached anotherpart of said die, means for moving said movable die plate, a stationary bearing eo-operative with said movable die plate so that when said die carriage is swung to and from the nozzle, the movable die plate is moved to and from the stationary die plate, means for storing power co-operative with said swinging die carriage and movable die plate whereby power is stored when said movable die plate moves from said stationary die plate nd released when said movable die plate moves to said stationary die plate and means for operatively releasing said power to movesaid movable die plate independent of the movement of said die earriage on its pivot.

11. A casting machine comprising in combination a pressure chamber, a nozzle, a sectional die, a pivoting die carriage having a stationary die plate on which is mounted one part of said die and a movable die plate on which is mounted another part of said die, a guideway rigidly attached to the die carriage, a crank (or member) slidably engaging said guideway and mounted on a stationary bearing, so that when said crank is reciprocated on said bearing it moves along said guideway causing said die carriage to swmg in and out of engagement with said nozzle, means for moving said movable die plate on said die carriage, a stationary bearing pivotally mounted eooperative with said means for moving said reeaoas movable die plate so that when said die carriage is swung in and out of engagement with the nozzle, said movable die plate is moved to and from said stationary die plate.

12. In a casting machine, a fire box, a melting pot, a pressure conduit below said melting pot terminating in a nozzle above said melting pot, the other end of said conduit being larger in diameter than said nozzle and being jacketed so as to receive the heat from the fire box and being connected with means to supply fluid pressure to the contents of said pressure conduit.

In witness whereof I have hereunto set.

my hand this 24th day of June, 1921.

EDGAR N. DOLLIN. Witnesses:

H. E. CHASE, M. R. CooKE.

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