US2000488A - Die casting machine - Google Patents

Description

May 7, 1935. T. CKORSMO 2,000,488

` DIE CASTING MACHINE Filed April 16, 1954 65 62 EEZ-J 7 l l 78 67 5673 49 72 7i 57 48 67 '154 yq 27 54 Q6 4j l a E537; 2 55 F2 a27 26 29 7557L f 53 69 /5 l f 24 51 68 89 4@ mlemtllre Changes thelellcharge portion 29. In order to support the oppo- DIE CSTWG MAG itllilx 'ilorbjorn 6. Korsmo, Madison, Wis., assigner to Madison-Kipp iCorptrations Madison, Wis., a corporation oi Wisconsin Application April iti, lg3d, Serial No. 720,995 i2 einen. (ci. aal-vo) This invention relates to the art of metal Fig. 4i, a perspective of the end oi the melting casting and more particularly, to machines for pot which supports the discharge end of the pres manufacturing die castings. sure chamber.

in the type of die casting machine to which the In the drawing, the frame of the machine is i present improvements are directed, a melting pot represented at t and carries a hot plate i on 5 is provided in which is mounted a pressure chamwhich is removably secured the stationary part er or goose neck. Molten metal in the melting d of a center-gated die. The movable half oi pot is permitted to ow into the pressure chamthe die is shown at 9, and li (Fig. l) indicates ber, preferably through a suitablevport or ports the operating means therefor. These means may lo therein. Following this, ejecting means, genbe either of the manual or power type and are not erally in the form of a plunger located in the shown since they do not comprise a part of the metal receiving end oi the pressure chamber and present invention. controlling the metal inlet port, are brought into At i2 there is shown the furnace in which is action to eject the metal from the discharge end supported the melting pot I3. The furnace l2 l5 oi the pressure chamber into a die associated omns at its under side into a housing ifi in 35 therewith. which is located any suitable heating means (not Heretofore, in the center-gated type of mashown) for the metal in the melting pot. Houschine with stationary pressure chamber and die ing lil is formed with a flange it through which arranged for horizontal movement, the pressure project bolts il having nuts il', for securing the 2@ chamber has been arranged so that the discharge housingto furnace l2. A bracket It secured 2@ portion thereof is above the level of the metal to main frame t carries adjustable supporting in the melting pot. This leaves considerable means it which serve in part to support the furspace between the metal in the pressure charnnace and burner-housing assembly described. ber and the die from which air is forced into the Melting pot i3 is supported in furnace i2 by 25 die each time a casting is made. Obviously, means of a horizontal flange 2l around the up-1l 25 entry of this large quantity of air into the die per edge of the melting pot which rests upon with the molten metal results in the production the upper edge 22 of the furnace. Furnace i2 oi defective castings. Frequently also, freezing is out away at 23 (Fig. l) to accommodate the ci the molten metal in the pressure chamber is extension 2t forming the end of the melting pot.

30 caused by chilling of the discharge end thereof. Mounted in melting pot I3 is a pressure cham- An important object of this invention is to ber 0r goose neck 26 which, preferably, is of the provide for reducing to va minimum the amount type having an upright, metal-receiving portion of air forced into the die from the pressure cham- 2l, an inclined portion 28, and a substantially ber. horizontal, metal discharge portion 29. Melting 35 A further important object is to provide for pot i3 has a notch 3i in its upper edge through 35 mounting the pressure chamber in the melting which extends the metal outlet portion 29 of pot so as to permit such free movement of the the goose neck. Notch 3i has an arc-shaped, pressure chamber as is desirable because of variatapering groove 32 in which rests a correspondtions in the size of the pressure chamber due to ingly shaped rib 33 formed on goose neck disn DOhel important Objeft iS t0 DIOVide d10 SS site end of the goose neck, the metal-receiving excluding means for the Inlet Port 01' PONS m portion 2l thereof is formed at each side with the pressure chamber' an inclined arm 34, the outer end portion 3S @ther objects and advantages of the invention @i5 wl appear from the following detailed descripg1g-12; nrif; g2g rests upon the upper 45 tion and accompanying drawing, in whichz- Figf l is a front elevation of a. portion of e Gose neck 26 has a' contmuous Passage e?" die casting machine with the present improvetendmg threurough n? the pqrtlon offhls ments applied theretn; passage which 1s located m the metal-receiving 5@ Fig. 2, a central longitudinal section through Section 27 0f the 005@ neck there i5 fitted a w the 'melting pot, the pressure chamber, and the Sleeve 38 provided near its IGWSI End With 5 die; port 39 opening into the inclined portion di of Fig. 3, a transverse section through the meltthe goose neck passage. Sleeve 38 and the goose ing pot and the plunger end of the pressure neck are provided with registering openings which to provide a pair oi diametrically opposed mem inlet ports 42, 43 near the top of the metal-receiving portion 21 of the goose neck.

Inlet ports 42, 43 are located immediately below goose neck supporting arms 34, 34, which latter are of inverted U-shape in cross section (see Fig. 1) so as to provide depending flanges 44, 46 extended downwardly at their lower ends on either side of the ports. There is thus provided by each supporting arm 34 an inclined channel 41 into which the corresponding metal inlet port opens and which channel extends upwardly to a point above the top of the melting pot. Each arm 34 also has a horizontal groove 41 to facilitate flow of the metal into the inlet port from the under side of the arm. With this arrangement, adequate means are provided for excluding entry of dross into the goose neck through metal inlet ports 42, 43. Even though the metal level in the potl should drop considerably below the point at which it is normally maintained, i. e., substantially at the upper edge of the melting pot, the means described would function effectively to perform their purpose.

Arranged for reciprocation in sleeve 38 is a metal ejeeting plunger 48, shown in Figs. 2 and 3 in its elevated position. At this time ports 42, 43 are open to permit metal from the melting pot to ll the goose neck. Following this the plunger descends to close ports 42, 43 and force the metal from the goose neck into the closed die. The mechanism for operating plunger 48 is adapted to be mounted in a. supporting member 49 attached to the top of melting .pot |3. This operating mechanism, which may be of the manual or power type, forms no part of the present invention and, therefore, is not shown, nor, for sake Vof clearness, is the plunger 48 shown in Fig. 1. Member 49 is provided with front and rear flanges 5|, only one of which is shown. These flanges and flange 2|l on the melting pot are correspondingly perforated to receive bolts 52 extending from furnace |2 and having nuts 5|', whereby all of these parts are rigidly secured together. Bolt and nut means 53 also serve further to secure the melting pot to the furnace.

Supporting member 49 has a notch 54 at the die end thereof to accommodate the outlet portion 29 of the goose neck. A set screw and lock nut device 56 mounted in supporting member 49 at this point engages the upper side of outlet portion 29 of the goose neck so as to securely maintain sealing engagement between groove 32 in the melting pot and rib 33 on the goose neck. In this manner, any possible leakage of molten metal from the melting pot at this point is prevented.

Supporting member 49 has notches 51 to accommodate the supporting portions 36 of arms 34. A set screw and lock nut device 58 is mounted in member 49 at each of these notches and engages arm portion 36 to prevent vertical movement thereof. However, each notch 51 is Wider than arm portion 36, so that said arm portion is free to move horizontally, provided set screw 58 is not set too tightly. With the described arrangement, it will be noted that the metal discharge portion of the goose neck is anchored to the melting pot, but the supporting arms 34 of the goose neck may move horizontally to compensate for variations in the length of the goose neck due to temperature changes therein.

As shown in Figs. l and 2, front and back plates 59, 60 extend from hot plate 1. Projecting inwardly from each of plates 59, 60 is a stub shaft 6| upon which is pivotally mounted a lever 62` intermediate its ends. The upper end of each lever 62 carries a set screw/and lock nut device 63, the inner end of which engages hot plate 1. The lower end of lever 62 has a hook 64 which engages a notch 65 in a lug 66 formed on supporting member 49 at one side of the discharge portion of the goose neck. Hook 64 on the other lever 62 engages a similar lug 66 (not shown) on the other side of the goose neck outlet. In this manner, the combined furnace, melting pot, and goose neck assembly is supported in proper relation to hot plate 1 and the die.

Inclined portion 4| of the passage through the goose neck communicates at its upper end with a horizontal connecting portion 61' which extends to the exterior of the melting pot. Here portion 61 communicates through an upwardly inclined portion 66 with a horizontal metal outlet portion 69. Mounted in stationary die part 8 is a nozzle 1| having a reduced portion projecting through an opening 12 in hot plate 1 and formed with a tapered end 13 having sealing engagement with the outlet portion 69 of the goose neck. A passage 14, having a restricted portion 15, extends through nozzle 1| and opens at its outer end centrally of the discharge portion 69 of the goose neck passage. At its opposite end, passage 14 feeds into the die cavity 16. It will be clear that the set screw devices 63, 63 may be adjusted in order to insure sealing engagement between the goose neck outlet and nozzle 1|.

As indicated by the dot and dash line A in Fig. 2, the goose neck A26 is so designed and mounted in the melting pot that the longitudinal axis of goose neck outlet 69 and also that of passage 14 in nozzle 1| are substantially on the same level as the upper edge of melting pot I3. Since the melting pot in operation is substantially full, the surface of the metal in goose neck outlet 69 is Substantially at the level of the axis thereof, but not sufficiently high to overfiow past the restricted portion 15 of passage 14 in nozzle 1|. In this manner, substantially half the volume of goose neck outlet 69 is lled with molten metal. Horizontal portion 61 of the goose neck passage is arranged at a lower level, so that it is almost entirely filled with metal. Thus, the air space normally present in the outlet end of the goose neck, and consequently the volume of air forced into the die at each casting operation, is materially reduced. As a result, much better castings have been produced with the described arrangement than has been possible heretofore. Also, by reason of the presence of the molten metal in the outlet portion of the goose neck, the objectionable freezing .of the goose neck at this point is eliminated.

What is claimed is:-

1. The combination in a die casting machine of a melting pot; and a pressure chamber in the melting pot, said pressure chamber having a metal discharge end fixedly supported by the melting pot, the opposite end of the pressure chamber being supported by the melting pot so as to permit variations in the size of the pressure chamber due to temperature changes therein.

2. The combination in a die casting machine of a melting pot; and a horizontally disposed pressure chamber in the melting pot, said pressure chamber having a plurality of connections to the metal pot, one of which is fixed and the remainder of which are adapted only for substantially horizontal automatic adjustment to compensate for variations in the size of the pressure chamber due to temperature changes therein.

3. The combination in a die casting machine of a melting pot; a pressure chamber in the melting pot, said pressure chamber having a metal discharge end supported by the melting pot; supporting arms extending from the opposite end of the pressure chamber to the melting pot; releasable means for xedly securing the discharge end of the pressure chamber to the melting pot; and releasable means for securing said arms to the melting pot so as to permit only horizontal movement of the arms.

d. The combination in a die casting machine of a melting pot having a notch in its upper edge provided with a groove; a pressure chamber mounted in the melting pot, said pressure chamber having a, metal discharge end provided with a rib, the discharge end of the pressure chamber resting in said notch with the rib in said groove; releasable means for securing said rib and groove in sealing engagement; supporting arms extending from the opposite end of the pressure chamber and having their outer ends slidably supported on the upper edge of the melting pot; and releasable means for preventing vertical movement of said arms.

5. The combination in a die casting machine of a melting pot; a pressure chamber mounted in the melting pot and having a metal inlet port; and a supporting member extending to the melting pot from the pressure chamber at a point above said port, whereby said member serves to prevent entry of dross into the port.

6. `The combination of claim further characterized in that said supporting member is provided with depending, dross-excluding portions located at the sides of said port.

7. The combination of claim 5 further characterized in that said supporting member is formed with a channel on its under side into which said port opens, said channel being inclined upwardly and away from said port.

8. A pressure chamber for use in a die casting machine melting pot, comprising a body including a metal discharge portion and anupright metal-receiving portion havingY a metal inlet port in the upper part of the side wall thereof, said pressure chamber being provided with drossexcluding means constructed and arranged adjacent the inlet port so that said port may have substantially horizontal, -free communication vdirectly with the interior of the melting pot.

9. The pressure chamber structure of claim 8 further characterized in that said dross-excluding means are in the form of `a hood surrounding the top and sides of the inlet port.

10. The combination in a die casting machine of a stationary melting pot; and a pressure chamber provided with a passage therein having an upwardly inclined portion, a horizontal connecting portion, a vsecond upwardly inclined portion and a horizontal discharge portion, all adjoin ing and arranged in the order recited, said pressure chamber being mounted in the melting pot so. that the longitudinal axis of the discharge portion of said passage is. substantially at the level of the top of the melting pot.

11. The combination in a die casting machine of a melting pot; a removable pressure chamber located in the melting pot and having a metal discharge portion 'projecting through the melting pot below its upper edge; and releasable means for eiecting sealing engagement between the melting pot and the discharge portion of the pressure chamber.

12. The combination in a die casting machine of a stationary melting pot; and a pressure chamber in the melting pot having a discharge end projecting outwardly through a wall of the melting pot and provided with a passage having a horizontal portion extending to the exterior of the melting pot, substantially all of said horizontal portion being below the level of the top of the melting pot, said passage outside of the melting pot forming a horizontal discharge portion located with its longitudinal axis substantially at the level of the top of the melting pot.

TORBJORN C. KORSMO.

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