US2575162A

US2575162A - Molten metal supplying device for pressure die-casting machines

Info

Publication number: US2575162A
Authority: US
Inventors: Sternberg Jaime De
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-06-28
Filing date: 1949-07-19
Publication date: 1951-11-13
Anticipated expiration: 1968-11-13
Also published as: US2564884A; DE834432C; US2564885A; FR993480A

Description

New. 13, 195] J 35 STERNBERG 2,575,162

MOLTEN METAL SUPPLYING DEVICE FOR PRESSURE DIE CASTING MACHINES Flled July 19, 1949 1O Sheets-Sheet 1 Nmr. 13, 1951' J. DE STERNBERG 2,575,162

} MOLTEN METAL SUPPLYING DEVICE FOR PRESSURE DIE CASTING MACHINES Filed July 1.9, 1949 10 Sheets-Sheet 2 ,-9 CrEN rs 10 Sheets-Sheet 5 1951 J. DE STERNBERG MOLTEN METAL SUPPLYING DEVICE FOR PRESSURE DIE CASTING MACHINES Filed July 19, 1949 v il /he 26 N 1951 J. DE STERNBERG 2, 75, 2

MOLTEN METALSUPPLYING DEVICE FOR PRESSURE on: CASTING MACHINES Filed July 19, 1949 l0 Sheet's-Sheet4 v .v 4w:

Nov. 13, 1951 J. DE STERNBERG 2,575,162

MOLTEN METAL SUPPLYING DEVICE FOR PRESSURE DIE CASTING MACHINES Filed July 19, 1949 10 Sheets-Sheet 5 N ,1 .1. DE STERNBERG MOLTEN METAL SUPPLYING DEVICE FOR PRESSURE DIE CASTING MACHINES Filed July 19, 1949 10 Sheets-Sheet 6 Nov. 13, 1951 DE STERNBERG MOLTEN METAL SUPPLYING DEVICE FOR PRESSURE DIE CASTING MACHINES l0 Sheets-Sheet '7 Filed July 19, 1949 M? N E 1951 J. DE STERNBERG MOLTEN MET 2,575,162 AL SUPPLYING DEVICE FOR PRESSURE DIE CASTING MACH Filed July 19, 1949 INES 10 Sheets-Sheet 8 109 i 115 4 V I 111 47 1J5 WM, 4.4... v6

AGE/yrs Nov. 13, 1951 Q STERNBERG 2,575,162

MOLTEN MET SUPPLYING DEV E FOR PRESSURE E CASTING MA NES Filed July 19, 1949 10 Sheets-Sheet 9 1 1/6 zvrvza (793 016 9: 5644 65 6- J. DE STERNBE 2,575,162 N METAL SUPPLYING D CE FOR SSURE DIE CASTING MACHINES lO Sheets-Sheet-ld MOLTE PRE Nov. 13, 1951 Filed July 19, 1949 10 76 M7012 {ME )5 Save V1964 Patented Nov. 13, 1951 MOLTEN METAL SUPPLYING DEVICE FOR PRESSURE DIE-CASTING MACHINES Jaime de Sternberg, Courbevoie, France Application July 19, 1949, Serial No. 105,627 In France June 28, 1949 Machines are already known for the diecasting of metals and more particularly of steel. These machines involve, for the operation of their elements, considerable powers, since the quality of the products obtained depends essentially on the pressure under which they are casted. During casting, in the last stage of this operation, it is necessary to apply to the metal when stiff soft, a very high dieing pressure which, properly speaking, constitutes an actual forging operation.

Such machines, with a hydraulic drive, have been built and they operate perfectly when the amounts of steel to be handled in one operation do not exceed a few pounds. The present invention relates to pressure diecasting machines capable of casting, in one operation, steel parts, for instance, weighing several hundred pounds.

The filling of the injection cylinder or cylinders requires the presence of a ladle into which the melted metal can easily be introduced and dosed. The main object of the present invention is to provide a pressure diecasting machine wherein the ladle assumes the shape of a cylindrical sector, rockin about a hollow trunnion; a fixed draining piston may enter, in a tight manner, the ladle. The bottom of said ladle is gone through by an additional draining piston which drives away the amounts of metal between said fixed piston and the bottom of'said pocket when the latter is at its higher position. The hollow trunnion for rocking the pocket is preferably in line with one of the injection cylinders and within said trunnion is reciprocably mounted the corresponding injection piston which is capable of moving back beyond the inlet aperture communicating with the ladle. Thus one is assured that no part of the melted metal introduced is liable to stagnate at any point of the injection mechanism and to solidify, which would make the operation of the machine impossible.

Another object of the present invention is to provide, in a pressure diecasting machine, a.

molten metal supplying device of the character described wherein the assembly comprisin the ladle, its hollow trunnion and the corresponding injection piston with its driving cylinder is mounted on a frame movable in the direction of 1 the axis of the injection piston. Thus the ladle can easily be removed from under its fixed pis- 5 Claims. (CI. 22-79) ton for cleaning it and, if necessary, for chang- 2 through sets of double action pistons and cylinders. It is. obvious, however, that such hydraulic means could be replaced by mechanical, electrical or other means.

The thus built machine makes it possible to handle quantities of steel amounting to several hundred pounds at a production rate of approximately one closing of the moulds every two minutes. The various operations can, of course, be effected by manual control but they could be adjusted by an automatic-control capable of causing the various operating elements to eifect the functions necessary for the performance of the operating cycle in a strictly sequentially timed order.

According to the present invention, the supplyin device in molten metal may be associated in the same pressure diecasting machine with a mould section locking device of the kind described in my co-pending application Serial No. 105,626 filed July 19, 1949, now matured into Patent No. 2,564,884, and/or an injection mechanism of the kind described in my co-pending application Serial No. 105,628 filed July 19, 1949, now matured into Patent No. 2,564,885.

The following description, taken in connection with the appended drawings given by way. of example will show clearly how the invention may be put in application.

Figures 1 and 2, placed together, show a profile view of a diecasting machine according to the invention, with part of said machine torn off at the level of the lock.

Figure 1a shows, schematically, the supply cir-.

cuit for the fluid locks.

Figure 3 shows, partlyin section taken along line III-III of Fig. 6, the machine on the side of the piston operating the opening of the mould,

said mould being open.

Figure 4, complementary to Figure 3, shows a machine, the various portions of the mould being adjacent.

Fig. 6 is a plan view of the machine with a partial cross-section. through the line VIVI of Fig.

3 which shows one of the locksin inoperative position Fig. 7 is a partial view correspondin to Fig.

6, the lock being in operative position.

Figure 8 shows a partial section of the machinealong line VIIIVIII of Figure 6. Figure 9 shows, on alargei'. scale, a profile view of the machine with a section. effected along line IX-IX of Figure 6.

Figure shows in partial section the ladle shown on Figure 9 in the raising position.

Figure 11 is a view similar to Figure 10, showing the positions of the elements at the end of the filling period.

Figure 12 shows, one. largerscale, the positions of the elements in the injection chambers at the end of the injection cylinder filling period.

Figure 13 shows, similarly to Figure 12, the positions of the elements at the end of the mould filling.

The machine comprises (Figures 1 to 4), a frame formed by a lower slide i and anupper slide 2, slides which are anchored on end cross pieces 3, 4 by castellated assemblies 5, tightened by threaded rods 6 which receive tightening. nuts 1. The crosspiece 3 supports a hydraulic cylinder 8 associated with a control piston 9 secured to aframe lll,*movin on sliding surfaces H and I2 formed on slidesl and "2. Frame Ill carries protruding parts 13 for the fixation of the drag it. This frame is to be brought in the neighbourhood of a frame 14, supporting thecope i5 complementary to drag l6 carried by the frame [3. drag and cope are brought together under the action of the hydraulicpiston 9. This piston is double acting and ensuresthe uniting of the cope 1'5 and the drag it along their jointing plane, as well'astheir-separation.

In addition to the piston rod 9, the frame It carries two 'ramplungers "ll which traverse the Said end cross piece 3 through bores provided for that purpose.

- On the two opposite-side's of the crosspiece 3 housings l8 are provided, for receiving sliding locks 19 (Figs. '6 and?) which become interposed behind the ends 20 of the ram-plungers I! when the component elements of the complete mould are united, is. when the frame lll is pushed all the way against the frame l4.

' The locks 19 are driven by double acting hydraulic cylinders'2 I, which are associated through plates 22 with the bodies-of the locks. Each lock iiisoperated by an assembly-of two cylinders 21! respectively arranged above and underneath the lock and each cylinder contains a piston the rod 23 of which is secured at one of its ends to the'side face 0f the crosspiece 3. The driving fluid is brought into the cylinders Ziby rigid pipes 24 reaching each end of the cylinder and capable of sliding in a telescopic manner inside the distributing pipes 25 (Figure 6) with interposition of tightness seals such as 26. Undersuchconditions, the piston is fixed and the cylinder 2| moves with respect to the piston, driving the lock 19-. The lock 19 is a hollow body capable of withstanding very high pressures and the chamber 21 provided therein opens on theside througha cylinder 28 which contains a piston element 29. The piston element 29 is guided inside the cylinder 28 and the tightness is ensured by apacking 30 acting as a gland, completed "by a retaining groove, 31 (Figuresl and, 6).

The displacement axis of each piston 29 is parallel with the displacement axis of the ram plungers l1 andthe housing 18 of the lock comprises a relief 32 for the passage of the foot of the piston 29. This housinglB comprises, further, a bearing face '33 for receiving the corresponding bearing face 34 of the lock, this bearing face 33 also containing the opening in which the ram plunger 11 moves.

The chamber 21 of the lock is placed in communication through

telescopic pipings

35 and 33 with a mercury tank 31b located inside the crcsspiece 3. This mercury tank is provided with a refrigerating device. A pump 31a, driven by a motor 31 is capable of drawing the mercury from the above tank to bring it, under a high pressure, into chamber 2! through the piping '38. This piping 36 opens into ducts formed in the mass of the lock I9 and opening through a perforation 38 into the chamber 21 at the upper portion of the latter. Similarly, at the lower portion of the chamber 27 open ducts 39 formed in the mass of the lock l9, and placed into communication with the telescopic pipe 35 to ensure, through gravity, the return of the mercury contained in the chamber 2! to the refrigerated tank. The retaining groove 3! communicates through a duct 40 with the return duct 35.

In the inlet and return ducts for mercury, machined in the mass of the lock l9, there are interposed stop valves operated by hydraulic cylinders 41 :and '42. These double action cylinders 4i and d2 play the part of closure cylinders for the mercury valves and said cylinders are connected with the hydraulic circuit of cylinders 21 through

telescopic pipes

43 and 45, the ends of which only have been shown and which are similar to the pipes .24. These hydraulic connections are effected in such a manner that when the cylinders 2| are operated to drive the locks l9 into the receiving cavities, the valves 42 are closed and the valves 4| are open; at the end of the driving in of the locks IS, the valves 41! also close, thus enclosing in hermet ically sealed spaces the mercury contained inside chambers 21. When the cylinders 2! cause the locks 19 to come out of their housings the valves 4| and the valves 42 open, allowing the return of the mercury contained in the cavities 21 to therefrigerating tank, the mercury pump 3111 being stopped.

Further, inside the space 21 an incased heating element '44 .is arranged, strongly armoured so as to be able to withstandvery high pressures. Thisselectric heating element, the external connections of which have not been shown, acts to heat the mercury contained in the chamber 2'2 when s'aidcham'ber is hermetically sealed by the

valves

41 and 42. Under these conditions, the mercury tends to expand with a considerable expansion power. Now when this expansion tends to occur, the lock I9 is completely pushed inside the cavity l8 and the piston element 29.

is'applied against the :rear edge 20 of the corresponding'ram plunger 11, said ram plunger having been carried completely forward by the hydraulic piston 9. The expansion of the mercury thus brings into action considerable pressures which "are transmitted alongthe jointing plane of the cope l5 and the drag l6, ensuring 'the olosing'of the mould with a very high energy.

The operation of the above. described device,

consequently; is as follows:

The piston 9 ensures theclosure of the mould and when the two half sections are in contact alongtheir jointing plane, the locks I9, operated by the hydraulic cylinders-2 I, enter the housings I8 and insert themselves behind the ram plungers ll. The cavities '2'! are filled with mercury by the mercury pump driven by the motor 37, said mercury-being relatively cold. The pistons 29 are applied against the ram plungers i1 and at- When the mould is to be opened, the action of "the heating element 44 is discontinued or not.

The valve 42 is opened thus allowing return of hotmercury to refrigerated tank. The pistons '29 move back. The cylinders 2|, driven in the opposite direction, cause the locks I 9 tocome out and free the passage for the ram plungers H.

The mould is opened 'by the slip caused by the piston 9. The mercury is refrigerated inside its tank and is prepared for'the next locking opera- -tion.

' The volume of chambers 27 and the thermal energy developed by the heating elements 44 are {determined so as to obtain the required pressure on the jointing plane of the half-moulds. The hydraulic energy to be brought into action is thus reduced to that which is necessary for obtaining "the operations and the hydraulic pressures can thus be reduced in a very large proportion, which brings about a substantial saving in motive forces. Further, the forces necessary for the putting under pressure of the jointing plane of the sections of the mould are also obtained very economically, since there is no need to provide any pressure accumulator or any pump developing said pressure. The total cost of the installation will be favorably affected since the dimensions of the pressure pr'oducing mechanisms will be very much reduced.

The above described mechanism are for the purposes of opening and closing the moulds, wherein a molten metal is injected under pressure, this metal being generally steel. The device allows the construction of moulds having very large dimensions, wherein considerable pressures will be developed at the time of dieing. These large dimensions of the moulds thus make it possible to mould bulky parts, such as example parts weighing about 900 to 1350 pounds. The filling of the mould, under such conditions with such a large amount of steel, makes it impossible to use a single filling cylinder. Such a cylinder would have such diameter and length that seizing of the thrust piston would inevitably occur.

' To obviate such drawbacks, the machine comprises a plurality of cylinders for filling the mould,

wherein pistons move, said cylinders being capable of being opened after each injection operation.

Under such conditions, as clearly shown in Figure 4, the frame I4 carrying the cope I5 is also mounted so as to be movable along the slides H and I 2 and it is tied to the frame H) by assemblies of sliding rods 50 attached to frame l4 and going through the frame l in corresponding bores where the rods 55 can move freely. Stops are provided on the rods 50 in such a manner that the backward motion of the frame In causes first the separating of the half sections l5 and I6 before causing the backward motion of the frame l4.

Opposite the face carrying the cope 15, the frame I4 is formed with a face 53 on which are mounted half-cylinders 54 for injection pistons 55. The conjugate half-cylinders 56 are formed in fittings 51, secured to the crosspiece 4. Similarly the half-cylinders 54 are formed in fittings 58 secured to the frame M.

The pistons 55, four in number in the machine more precisely described, are op osite in pairs and at right angles to each other. Their axes are contained in a plane perpendicular to the the mandrel 12.

movement axis of the frames I0 and [4. The axes of said

cylinders

54, 56 are concurrent and, perpendicularly directed to their plane a converging tuyere 59 for the injection of metal opens into the frame l4, said tuyere being formed in a socket 60 secured to the frame Hi. This injection tuyere opens into a pouring hole 5| formed in cope i5 and which follows it, said pouring hole being used for the formation of the runner-stick of the metal introduced into the stamps of the mould and having a neck 62 which constitutes, in said runner-stick, the breaking throttle upon opening the mould.

The pistons 55 (Figure 5), are set in motion by rods 63 which are connected with pistons 54 moving inside double action hydraulic cylinders 65. Said cylinders 65 make it possible to obtain synchronous reciprocating motions of pistons 55, for example.

The introduction of the molten metal in the injection half-

cylinders

54, 56 is effected through one of the cylinders 65 of this series of cylinders. To this effect the half cylinder 56 comprises a lateral aperture which communicates with a ladle 6?. cylinder 66 in front' of the corresponding piston 55 when the latter is at the end of its back stroke.

The injection mechanism described below is completed by a mechanism for closing the tuyere 59 and for dieing the metal introduced into the stamps and which shall now be described:

The crosspiece 4 comprises, at its center, a cylindrical bore 10 formed in a socket and wherein moves a sleeve H. The sleeve 'll itself is provided with a bore where a cylindrical mandrel 12 can move. The sleeve H has such a diameter that it can be applied in the tuyere 59 to obturate it in the vicinity of its wider portion and in a zone facing the crosspiece 4 whilethe diameter of the mandrel I2 is such that it slides inside the tuyere 59 in its narrower portion and obturates the aperture thereof facing that of the pouring hole 6|. The tuyere 59 can thus be closed in two different manners, either by the sleeve H or by The mechanism operating the sleeve and mandrel comprises a hydraulic piston I3 tied to the mandrel through a rod 74, the piston and said rod being associated with a yoke 15; said yoke 15 is connected to return rods 16. The piston I3 is operated by a hydraulic cylinder 71 carried by a pillar 18, said cylinder being further tied to the crosspiece 4 through rods 19. Said rods 19 are also tied to a yoke associated with the cylinder Ti. The yoke 15 is capable of sliding on rods 8| which, through corresponding bores, go through the yoke 3!] and which are associated with a movable yoke 82, itself associated with the sleeve ll.

In line with the rods 8|, on. the yoke 15 and on the yoke 8t, stopping locks are provided, acting by the entrances of latches in apertures provided in said rods 8|, these wedging latches being operated by auxiliary hydraulic cylinders, 83 and 84 and not being shown for greater clearness in the drawings. j

The rods 16 go through the frame of the cylinder l1 and are tied to a movable yoke 85 acted upon by the rods 85 of auxiliary hydraulic return pistons contained in the frame of the cylinder Tl.

The cylinder H comprises an inner piston l3, tied to the yoke 15 and which enters a, second piston 88 moving inside the cylinder H. hollow piston 88 is supplied by a pipe 89 going through the yoke of the cylinder 71 in a tight slid-f This aperture 63 is effected in the half anglepiecesfi, the p'i'pe'SQ is put in communication wvith a cylinder ,9! sliding in a "tight "and 'tele'scopicmanner on 'a supply pipe 'Q2.

"The operation cycle of the apparatusthus described is as follows:

As'will be seen clearly on Figure 5, the empty mould is closed. The

cylinders

54,56 are empty. "Thesle'eve H and the mandrel l2 are at their rear positions. By means of "the ladle 51 which will 'be described later, the

cylinder

54, 56 is filled with molten metal and -the latter enters the cylinders '55. Previous to the filling (Figure '12), the mandrel 12 is pushed forward completely :unti'l'itcloses the tuyere 59. The molten metal fills only said cylinders 5'5, '56. The mandrel "'52 "has beenpushed all the way by means of the pistons "53, '58, the locks 83 having released the :yoke from therods 8| and the locks 84 having been put in action for wedging said rods 8| and keeping the yoke 82 in its rear position. The :sleeve H has been left behind.

The locks 83 and '84 remaining in'the position indicated above, the return pistons acting on the rods 85 are put in action said rods 86 in turn acting on movable yoke 85, rods 16, yoke [5, rod 14 and mandrel 12. The mandrel 12 moves back completely (Figure 13) and the cylinders 65 are placed under load. The pistons move closer to the point 'of convergence of their axes and the metal is'driven into the stamps of the mould through the injection tuyere 59 and the pouring hole 6|. At that time, the locks M are released and the locks 83 are wedged. The piston 88, acting as a cylinder is put under load by the

pipes

89, 90, 9!, '92, and the assembly of the mandrel '12 and of the sleeve H passes between the pistons 55 which are closer together and drives the liquid metal which was in this space, into the tuyere 59. When the sleeve H comes in contact with the wall of the tuyre 59, said tuyere is closed. At that time (Figure 5), the locks 84 are wedged and the locks 83 are released. The pipe 92 is then stopped and only the piston 1'! is supplied, causing an important thrust on the mandrel '12, the only one which is free. The mandrel l2 enters the tuyre 59 (Fig. 12) and causes the dieing of the metal contained in the stamps of the closed mould. Under such conditions, the metal undergoes an actual forging operation which gives it a great strength.

When the metal is sufficiently cooled inside the closed mould, the hydraulic suppl es of the injection mechanism are cut off and the pistons 64 are simultaneously moved u wards towards the dead points remotest from the axis of their assembly. The piston 9 is put inaction forseparating cope l5 and drag H5. The moulded parts are retained on the drag Hi. When the stops 5! of the rods 58 (Figure i) come in contact with the frame It), the frame It is driven with the frame 10, causing the opening of the injection cylinders. The mass of metal contained in the pouring hole 6| breaks at the level of the neck 62 and there remains a runner stick associated'with the moulded parts, on one hand, andagate pit surrounding the mandrel 12, on the other hand. The backward motion of the mandrel :l2 and of the sleeve H will causesaid gate pit to fall. .Ejectors 33 on step rods go through the frame 10 and, pushing against the crosspiece 3, will cause the extraction of the moulded parts out of the drag l6 and the moulded part will be capable of beingseized by -a suitable conveyor. Thecomplete opening of the moulds and injection mechplace in a controlled atmosphere.

anisms will allow a complete cleaning of said mechanisms and their covering, for example by spraying .of a suitable liquid.

It is to be noticed that the frames wand 14 and the crosspiece '4 comprise refrigeration ducts =95 forkeeping them at-a sufiicientlylow temperature whatever be the rhythm adopted for the casting operations. It is also to .be noticed that the frames l0 and M are made in the shapeof cups containing the mould sections .15 and IS. The

cup of the frame 1'0 is edged by a packing =98 which Offers a plastic ring '9? for hearing on the edges of the cup formed in the frame It so that the moving closer together of these two frames creates a sealed enclosure around the closed mould sections. The moulding can thus take Similarly, the rear face 53 of the frame 14 comprises a sealing ring '98 which, applied on a ring99 of the front face of the crosspiece 4 will make it possible to insulate the injection mechanisms and to also operate said injection in a controlled atmos- Dhere.

When the mould sections-and injection mechanism are suitablycleaned, the piston 9 causes the joinings and closures and the operation cycle can be repeated. v

To operate at a, fast rhythm, the moulding .machine must be supplied with molten metal :by means of a ladle '61 which makes it possible to accurately determinate the amounts -of metal for the injection and said ladle must be capable of being easily cleaned andreplaced. To this effeet the ladle B7 is mounted on one of the-sides of the crosspiece 4 and, 'in profile, it assumes the shape of a circular sector (Figures 9 .to 1-1). The metal wall of said ladle constitutes .a pivot .100 whose bearing surface l0| encloses the cylinder 66. Said pivot 1.00 is pivotally .mounted in a bearing member loud. The aperture 68 provided radially inside the cylinder 66, inside the .pivot It opens throughanaperture .I'BZ in said .ladle. This ladle is keyed bya cotter-pin Mon the-cylinder 56 which ,pivots inside asocket and is (connected tightly at the end of the corresponding cylinder 56. The circular wall [03 of the ladle is formed with a gear 35 coming into engagemerit with a pinion 106 the-shaft of which is driven by a raising motor lfifia (Fig. 6). This raising makes it possible to cause the metal introduced into the ladle at the level of the .receiving spout Ifll to flow through the aperture I92 and the aperture 68 into the cylinder '66. The walls of the ladle are provided with a refractory lining I98, said wall offering a cylindrical portion, a plane bottom lllfiand sides in the Shapes of circular sectors H0 (Figure 8).

The cylindrical wall of the ladle is formed with an aperture HI wherein a draining piston H2 is introduced. The cylinder H1 is tangent to the plane bottom Hi9 and the aperture I02 .as wellas the aperture 68 are located on thegeometrical extension of the cylinder It]. .Above vthe'ladle .81 there is attached, on the crosspiece A, .as'upport H3 associated with a plate 41M .formingadriv: ing out piston. To this effect the contour of this driving out piston Ht issuch that it enters .exactl-y the space between the walls of .theladle during the raising of the latter. This ,piston- I'Ul bears against the pivot I06. The piston -.|l2 is provided with a tail piece .5 which comprises a half thickness assembling element 1 l6 .and a perforation Hi. This half thickness assembling and this perforation are .for the purpose .of .com-

ing into engagement with a stud '8 and a cor? responding assembly H9 provided on a thrust rod I20 (Figure 9) having an invariable-direction with respect to the machine.

Upon the raising of the ladle, once it has been filled with metal brought by the spout I01, through the space which separates this spout from the contour of the piston I I4, said piston II4 enters the ladle and drives out the metal contained therein into the cylinder 66. This operating' phase is shown in Figure 10. At this moment, the tail piece II5 of the piston I'I2 guided by the wall II 2a is associated with the rod I20 and the metal included between the bottom I09 and the piston H4 is ready for being completely driven out of the ladle by the thrust of the rod I20. The piston I I2, the head of which is slightly hollowed is driven until it comes in line with the transverse bore of the cylinder 66. At this time the corresponding piston 55 (Figure 8) will drive out the metal remaining inside the pivot.

The operating oi the rod I20 is caused by a hydraulic piston moving inside a double action cylinder I2I provided on the side of the crosspiece 80.

Construction and operation of this type make it possible to obtain an easy filling of the ladle and a total ejection of the metal it contains. The return of the piston H2 and the lowering in rotation of the empty ladle is eifected by operations in the reverse direction to those described and when it reaches its lower position, the ladle is again ready to be filled. Suitable stops are provided for preventing the piston I I2 from escaping from the bore I I I.

i The ladle 5? which receives the extremely hot metal is subjected to a rapid wear. Further, to effect the cleaning of said ladle, which must be fairly frequent; the latter must be easily accessible from the outside.

.As can be seen from Figures 6 and 8, the corresponding piston 55 is driven by a hydraulic, double action cylinder I30, carried by a yoke I3I; this yoke I3I comprises two bores I32, I33 which allow its motion on cylindrical guides I 34, I35, one end of which is attached on the crosspiece 4 and the other end of which is carried by a stand I36 arranged laterally with respect to the machine. The front portion of the yoke is associated with two control rods I 31 which, themselves, are double acting hydraulic piston rods moving inside cylinders I38 associated with the stand I36. The stand I36 is provided with a perforation I39 which allows a free passage to the cylinder I33 with a view to save space and, for the same purpose, the rods I31 are attached to the bottom of blind bores I40, which come and cover the cylinder I33 when the yoke I3I is at its withdrawn position.

The rear portion I4I of the yoke I3I is associated with a socket I 42 within which is housed a socket I43 perforated with cooling ducts I43a; said duct I43 contains a cylinder I44 cooled by means of said cooling ducts and which serves as a guide for the piston 55 of the injection cylinder 56 when it is compelled to move back at the same time as the yoke I3I. The pivot I00 of the ladle 51 rotates on the notched extension of the socket I43 and is stopped axially by a shoulder of the socket I42 and a second shoulder added on the end of the socket I43. The socket I43 itself is keyed on the end of the cylinder 66.

To relieve the pivot I00 and bearing member I001; from'the Weight of the ladle loaded with liquid metal, this ladle is provided with a stand I45 resting through an anti-friction bearing I48 on the lower rod 135, said stand being thus" follows:

. The rods I3-Ipull on the yoke I'3I which can drive the ladle Ii'I laterally with respect to the machine and release it from the piston I I4. The

ladle is easily accessible. It may be cleaned and its refractory lining can be changed. The reverse operation of the pistons contained within the cylinders I38 makes it possible to bring back the ladle in position and, at that time, the end of the cylinder 56 enters a housing for the corresponding end of the cylinder 56 facing it.

It is obvious that, within the scope of the invention, modifications may be made to the types of embodiment just described.

In particular, the operations may be controlled by hand and separately or they may be controlled by automatic relays which will efiect the operating cycle for pressure diecasting.

What I claim is:

1. A molten metal supplying device for the injection cylinders of a pressure diecasting machine, one of said cylinders acting as molten metal supplying cylinder for the other cylinders, comprising, in combination, a ladle having longitudinally theshape of a hollow circular cylindrical sector, pivotally mounted about an axis coinciding with the axis of said supplying cylinder. and formed with an upper rectangular filling opening contained in a horizontal plane when the ladle is at rest, said ladle comprising a wall formed of a part of a cylinder, two longitudinal parallel plane walls in the shape of circular sectors, and a rec tangular plane bottom wall, the part of which directed towards the pivotal axis forms a hollow cylindrical pivot centered on said axis and having an aperture opening from said axis into the interior of said ladle along its total transverse inner thickness, dismountable refractory linings of uniform thickness mounted on said walls inside said ladle, the free surface of the lining corresponding to the plane bottom wall registering the lower edge of said radial aperture, a hollow pivoting trunnion housed in said hollow pivot one end of which is tightly and pivotally mounted on one end of said supplying cylinder, said hollow trunnion having an inner diameter equal to that of said supplying cylinder and being formed with a radial aperture registering with the radial aperture of said pivot whereby a tight communication between the ladle and the supplying cylinder is obtained, a driving out piston vertically secured on the machine above said filling opening for extending to substantially the horizontal plane containing said filling opening when the ladle is at rest, the cross-section of said driving out piston being equal to the radial inner cross-section of said ladle, means for pivoting upwardly said ladle when filled with molten metal up to an angle at which said emptying piston registers the upper edge of said radial apertures,

whereby said molten metal is ejected from said ladle into said supplying cylinder, said pivoting means acting after emptying of the ladle for returning said ladle to rest position by a downwards pivoting movement, means for draining the part of said ladle located below said fixed piston when said ladle has reached its raised position, means for ejecting the molten metal thus contained in.

the hollow trunnion and the supplying cylinder .75 to the other injection cylinders, and means for 1 1 releasing,ofi'saidladle trom said fi-xed piston with a'view toclean the-same and replacesaid refractory linings when necessary;

,2..A, supplying device according ta claim 1, wherein the means for ejecting the molten metal contained in thehollow trunnion andthe supplygngcylinder comprises a cylindrical extension;

inrline withthe supplyingcy-linder, secured onthe ladle oppositely to said cylinder andhaving aninner diameter equal to. that of said cylinder, cooling means. for said extension, an injection housed in said extension during. the emptying ofsaid ladle, means for reciprocating said injection piston. through. the. hollow trunnion and the supplying cylinder when the draining operation oi the, ladle is'ended, whereby all the molten metal. contained. in the ladlelis. ejected. into the other injection cylinders.

'3 A, supplying, device according, to claim 1, wherein the. cylindrical wall and the corresponding. refractory lining are formed with a rectangular channel opening in the ladle perpendicular to the plane bottom wall oi said ladle and having. dimensions equal to those of the radial apertures and wherein the means for draining the part of the ladle. located below the fixed piston when said ladle has reached its raised position comprises a draining piston housed in said channel. andithe operative face of which is flush at rest with'the free face of said lining and means for reciprocating said" draining piston between the'planebottom wall of said ladle and the operative face of-the fixed piston when the ladle-is-initsraised position; whereby said draining" pistonejects into the hollow trunnion" the molten metal" cont'ainedin said ladle" after raising-underneath said fixed piston.

42' A supplying device according to claim 3; wherein the draining piston has arod extending out of the ladle and formed with a perforation and wherein the reciprocating means comprises a: thrust rod" having at rest such a.- position that;

it registersv with; said piston rod. when: the ladlereaches its position of maximum; raising,. al-stud" fixed on said thrust rod. for engaging the perforation: of said piston rod, means for maintain ing, said draining piston flush with the cylindriw calinner' wall of said ladle during the; raising;

of the latter, and means for reciprocating. said thrust rod tied to said draining piston towards the radial aperture of the ladlewhen the ladleis at its position of maximum raising;

5; A. supplying. deviceaccording to claim: 1,

wherein the means for releasing of; theladle fromthe fixed piston comprises a movable support carrying the assembly formed by the ladle. he

hollow trunnion, the injection piston and the operating means for the'1atter, saidsupport be! ing. displaceable parallelly to; pivoting axis of saidladle, means for guiding. said-support; during such displacements, and means for moving. said movable support farther away fronrthe supplying. cylinder when a cleaning of said ladle or re'- placement of the refractory linings is required-- and closer to said cylinder when such operations: have been performed.

JAIME or STERNBERG.

REFERENCES CITED The tollowing references are: of record in the