US2183112A - Die casting machine - Google Patents

Description

DIE CASTING MACHINE Filed July 7, 195? 2 Sheets-Sheet 1 we a r Dec.'12, 1939. VONTQBEL 2,183,112

DIE CASTING MACHINE Filed July 7, 1937 2 Sheets-Sheet 2 IV va v 5% P Patented Dec. 1 2, 1939 I 9 DIE CASTING MACHINE akob Vontobel, Teufenthal, Switzerland, assignor to the firm Injecta Aktiengesellschaft, Teufenthal, Canton of Aargan, Switzerland, a

, joint-stock company of Switzerland Application July 7, 1937, Serial No. 152,406 In Germany August 7, 1936 '3 Claims. (01. 22-68) v The present invent-ion relates to die casting maestal and carrying bolted thereto one half 4 of chines for manufacturing dense castings from the mould and further comprises a movable plate alloys having a high melting point. 6 slidably held on four rods secured to said With such metals the hitherto known methods standard. The other half 1 of the mould is fast of die casting cannot be easily employed. The to plate 5. The mould, a chill, has, besides the 5 use of such metals in a liquid state proved to be mould l0 and the holes l9 for the pilot pins, also wasteful on account of the corroding and wearguides 8 for the cores 9 and an inlet conduit II ining away of the moulds. Therefore machines t nd d as a storage an pressure chamber. This were proposed having a cold chamber into which inlet conduit includes also an intermediate cham- 10 the metal was introduced by hand in a pasty state. ber or enlarg 3 S parated from the inlet 10 But then with this half liquid metal also slag and the mould by two restricted passage ways 33 would be filled in. Moreover, the metal would 501- and 35, the latter branching oif Sidew y and idify at the gate, for the gate is necessarily highly forming the direct inlet of the mould. The inlet constricted to facilitate breaking'the waste from orifice I2 is conically e ed. The mould and 5 the casting. This fact and the tenacity of the the inlet passages are provided with holes l3 for metal had a bad influence on the forming of the the ejector pins. surfaces and the texture of the castings. The movable mould P ate 6 is connected by castings were characterized by porosity and even means Stays With a Pusher pl te "5 and belarge' holes and cavities. tween these two plates are slidably arranged, on It has already been proposed for die castings o e d e Core P t H and 011 the Other d 9 made of low melting alloys to act with several the ejector p a e 8- e pe ati f the pusher pressures of different amount upon the metal p at '6 n e y e pe n and closing of while solidifying in the mould in order to imthe mould is effected by means 'of a knee joint prove the texture of the same. Difierentpresmovement 22. sures were employed for the introducing and af- A median red 20 Carries d bly mounted terwards for the compressing. But for high thereon a cross bar 2| to which are linked two melting alloys this method wont do, because it links 22 which-are linked with their free ends to is hardly possible to conceive control apparatus the joints of two joi ted pairs f t0ggle arms 4 which can exactly follow the solidifying process linked to the pusher Plate l6 and t the station- Within the mould. ary guide block 23. If the crossbar is moved' With the method according to the present intoward the right from the position shown, the two vention the effect of two successive different prestoggle pairs of arms 24 Will bend d pen the sures is obtained with only a single source of mould- If t e Cross bar moves ma Contrary ipressure by a contrivance by which, although the rection the mould will be closed, as shown in the metal is employed in a very liquid state, resistdrawing. The mould c s be Opened a d 35 ances to flow are used which retard the filling closed by other e s n e o e echaof the form up to the beginning of the pressure of nism here illustrated. The guide block 23 is the piston, with the purpose to carry the pressure bolted to the bedplate l. on the liquid metal by the piston only to a pres- The pressure cylinder 25 with the piston 26 is sure adapted to overcome the static pressure of carried by the pedestal 2. The pressure cylinder 40 the metal filling the mould. Thus after having may be displaced in two directions by means of filled the mould softly and with an even speed the the slides 3|, 32 and the screw spindles 29 (Fig. high pressure of the piston becomes then efiective 2), 30 (Fig. 3). Thus the piston 26 may be adand compresses the metal in the mould by utilizjusted to be co-axial with the inlet pipe or presing part of the metal in the inlet. sure chamber II in the case of difierently sized 45 The annexed drawings represents schematically moulds. The piston is withdrawn so far from as an example a casting machine for a T pipe the inlet conduit duringthe introducing of the fitting. metal, that the metal may be easily poured in Fig. 1 is a vertical section of the mould and by means of a ladle or otherwise. Figs. 2 and 3 are side and end elevation on a The machineis operated as follows: 50 smaller scale of a casting machine. When the machine is at rest the mould is open According to the drawings the mould box is atand the piston 26 withdrawn from the inlet ll tached toapedestal 2 mounted upon a bedplate l. The cores 9 are inserted into the movable half The mould box is. in two parts and comprises a of the chill. In this condition the mould will be stationary plate 3 cast in one piece with the pedclosed by operating the piston rod 20 and a so- 55 ciated toggle mechanism, whereupon the metal in a very liquid state is filled into the inlet conduit II by means of a ladle. Immediately after this the piston 26-will be introduced into the inlet conduit and the still liquid metal, which has been checked from the immediate admission into themould by the restricted passage ways 33, and the intermediate chamber 34, will be pressed into the mould by a pressure of the piston which pressure will be maintained unto the complete solidifying of the metal. During this operation all air will escape through the vents 28 while impurities slag and the like, are retained by the restricted passage ways of the inlet.

When the metal has been completely solidified the mould is opened and the casting expelled by the ejector pins. In this way a rapid delivery of castings may be obtained. In consideration, that the mechanism for the timed moving of piston 26, pusher plate I6, core plate I! and ejector plate 18 and core screws 21 may be supposed to be well known and may be arranged in different ways, such mechanism has not been shown in detail.

What I claim as new is:

1. Apparatus for single shot die-casting of manually ladled high temperature alloys in liquid condition, said apparatus comprising a die having a mold cavity, a generally upright pressure chamber communicating ,with a conventional highly constricted gate formed at the mold cavity, the communication between the pressure chamber and the gate including alternate constrictions and enlargements suitably dimensioned to retard the initial flow of metal from the pressure chamber to the gate, there being two constrictions with an abrupt and substantial enlargement therebetween, all in addition to the aforesaid constricted gate, a plunger, means to reciprocate the same into and out of the pressure chamber, said plunger being fully retractable from the pressure chamber in order to facilitate manual ladling of a quantity of the liquid metal into the pressure chamber, and means to eject the solidifled residue from the pressure chamber, the enlargement, and the die cavity, said pressure chamber being higher than the gate, whereby the metal when first ladled therein would, if unobstructed, quickly flow to the gate, the arrange- 11192121 acting to retard the initial flow of the me 2. Apparatus for single 'shot die-casting of manually l'adled high temperature alloys in liquid condition, said apparatus comprising a die having a mold cavity, a generally uprightpressure' chamber communicating at its lower end with a conventional highly constricted gate formed at the bottom of the mold cavity, whereby the metal being cast flows downwardly, sidewardly, and then upwardly into the mold cavity, the communication between the pressure chamber and the gate including alternate constrictions and enlargements suitably dimensioned to retard the initial flow of metal from the pressure chamber to the gate, there being two constrictions and two enlargements, all in addition to the aforesaid constricted gate, a plunger, means to reciprocate the same into and out of the pressure chamber, said plunger being fully retractable from the pressure chamber in order to facilitate manual ladling of a quantity of the liquid metal into the pressure chamber, and means to eject the solidifled residue from the pressure chamber, the enlargements, and the die cavity, said pressure chamber being higher than the gate, whereby the metal when first ladled therein would, if unobstructed, quickly flow to the gate.

3. Apparatus for single shot die-casting of manually ladled high temperature alloys in liquid condition, said apparatus comprising a die having a mold cavity at the parting face, a generally upright pressure chamber also formed in the die at the parting face and communicating at its lower end with a conventional highly constricted gate formed at the bottom of the mold cavity, whereby the metal being cast flows downwardly, sidewardly, and then upwardly into the mold cavity, the communication between the pressure chamber and the gate including alternate constriations and enlargements formed in the die at the parting face and suitably dimensioned to retard the initial flow of metal from the pressure chamber to the gate, there being two constrictions and two enlargements all in addition to the aforesaid constricted gate, a plunger,- means to reciprocate the same into and out of the pressure chamber, said plunger being fully retractable from the pressure chamber in order to facilitate manualladling of a quantity of the liquid metal into the pressure chamber, and means to eject the solidified residue from the pressure chamber, the enlargements, andthe die cavity, said pressure chamber being higher than the gate, the arrangement being devoid of mechanical valves or the like to obstruct the flow of metal.

, JAKOB VONTOBEL.

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