US1872085A - Die casting machine - Google Patents

Description

Aug. 16, 1932. T. c. KORSMO DIE CASTING MACHINE 2 Sheets-Sheet l Filed Sept. 9. 193D blzboma, Q. chf@ am m0 MQQ@ All@ 16, 1932. T. c. KoRsMo DIE CASTING MACHINE Filed Sept. 9, 1950 2 Sheets-Sheet 2 casting machines of the Patented ug. 16, 1932' UNITED' ySTATESv PATIEN'I" ori-ICE TORBJORN CrKORSMO, 0F MADISON, WISCONSIN, ASSIGNOB TO MADISON-KIP? COB- PORATION, 0F MADISON, WISCONSIN,

A `CORPORATION OF WISCONSIN Dm cAsrrNG MACHINE Application led September 9, 1930. 4.Serial No. 480,728.

by which the movable die part is operated to open and close the die. The particular object in view is to provide means which insure that the die parts are brought tightly together at all points and locked in this condition, when the die is closed. The importance of this in preventing leakage of molten metal from the die cavity and the formation of burrs on the castings will readily be appreciated.

A further objectis locking means of the type the provision of die described which are adapted for use with dies of different sizes, including the largest commercial forms now in use.

Since the features of the device herein described are applicable particularly to die type disclosed in my earlier Patents Nos. 1,607,677 of November 23, 1926, and 1,627,784 of May 27, 1927, especial reference is madcthereto. The invention, it will be understood however, is in noWise limited to this type of machine.

The accompanying drawings, which disclose a practical embodiment of the invention now in successful commercial use, comprise Fig. 1, a fragmentary side elevation view of a die casting machine embodying the invention, the machine illustrated being of the type shown in my two earlier patents, supra. In this view, the die is open and therefore the locking device is in its inoperative position;

Fig. 2, a similar, plan view which also shows the parts in the same position;

Fig. 3, a fragmentary side elevation of the die locking device `when the die is closed, but not locked, the locked position of the parts, ready for a casting to be shot, being indicated in dotted lines;

Fig. 4, a similar, plan view of the same;

Fig. 5. a perspective of a detail;

Fig. 6, a side elevation. partly in section, of a modified form of the locking device i adapted to take care of large sized dies;

. ing at the right in Figs.

to die carriage 8, which 1s slidably mounted 80 Fig. 7, a plan of the same; and

Fig. 8, a side elevation, partly in section, of a modied form of the locking device.

In order to disclose the invention i'ully,l

it is not necessary to illustrate the complete die casting machine; nor to describein de-l l tail the construction and operation of the die charging means and the means for opening and closing the die. However, such reference will be made to these parts and their mode of operation as is essential to a complete understanding of the present invention. Details lof construction and operation of the devices referred to are fully set fort-h in my earlier patents, 1,627,784, supra, to which reference is made for this purpose.

The machine, as shown in the drawings,

`includes a frame member 1, carrying a gear housing 2. The ends of a series of guide rods ' l0 3, 3, 3', 3 are secured in the right hand wall of housing 2 and their opposite ends find support in hot plate 4. The hot plate, which carries the stationary die part 5, is supportedbntop of a second frame member 6. Both ' I5 members 1 and 6 are mounted on the bed of the machine (not shown) as is alsothe combined melting pot andfurnace 7 appear- 1 and 2. Attached on guide rods 3, 3, 3', 3', is the movable die part 9. Y

The usual goose neck or pressure chamber 10, having an outlet nozzle 10', is shown pivotally mounted on lthe frame ward end o the goose neck is pivotally supported at 12 in a vertically movable yoke 13, whereby the goose neck may be swung up and down about its iXed pivot 11. As it appears in Figs. 1 and 2, the goose neck is sub- 90 merged in the molten metal in melting pot 7, whereby it may receive a quantity of the metal preparatory to charging the die.

The mechanism for opening and closing the die and for raising the goose neck into 95 die charging position will now be described. A drive shaft 14 in the sides of housing 2. vided for the housing and conceals the gearing for driving shaft 14.

Nos. 1,607,677 and 35 at 11. The oris journaled at its ends A cover 15 is pro- The die operating parts about to be described being duplicated on either side of the machine, only the forward set will be referred to in detail. The corresponding parts at the rear are indicated by primed numbers.

A crank 16 fixed to the front end of shaft 14 has a cam 17' secured fast thereto. This cam carries a roller 18 engaging a slot 19 in the end .of connecting rod 20. A rollerv 21 mounted for rotation on the inner face of connecting rod engages at all times with the edge of cam 17.

At their opposite ends, the two connecting rods 20, 20 are joined together by a cross member 22. This cross member is fxedly secured on die carriage pusher rods 23, 23 intermediate their ends, the rods being extended on either side of the cross member to pass through suitable guideways provided for this purpose in hot plate 4 and the end of housing 2 (see Fig. 2). Split bearings 24, 24 on die carriage 8 slidably support the carriagel on pusher rods 23, 23 for a purpose explained ater.

On each side of die carriage 8, pushergrod 23 is threaded to receive a pair of nuts 25 to the right and a pair of nuts 26 tothe left of the die carriage. A spring 27 located between nuts 26 and the die carriage serves to urge the carriage towards the right and against nuts 25. o,

Also pivotally connected at one end to cross member 22 is an elevator pusher rod 28. The right hand end of this rod has a pin-and-slot connection at 29 with the upper arm of a bell crank 30. The other arm of the bell crank and the corresponding arm of the rear bell crank 30 serve, when the machine is operating, to eect the necessary raising or lowering of yoke 13 to actuate the goose neck 10.

No claim is made herein to the mechanisms so far described, since these are fully covered by my prior Patents Nos. 1,607,677 `and 1,627,784, supra, and No. 1,590,246 of June 29,

1926, and No. 1,631,686 of June 7, 1927. Reference may be had to these for further details.

Referring particularly now to Figs. 1 and 2,

it will be seen that interposed between cross member 22 and movable die carriage 8 is a set of four turn-buckle type, struts or braces 31, 31, 31', 31', one pair at the front edge of the die carriage, and the other at the rear edge. These struts are identical in construc- Y tion, and each extends to a corner of the die carriage 8. At the opposite end, the strut is pivotally connected with cross member 22. As will appear presently, the purpose of these struts is to assist in forcing die carriage 8 to the right, when the die is closed, so as to insure full contact between the faces of die parts 5 and 9, and to positively lock the die parts in this position until the casting has been shot and frozen.

The details of construction of struts 31, 31,

31', 31' appear clearly in Figs. 3 and 4. Each strut, which is in the nature of a turn-buckle assembly to permit adjustment for different sized dies, is made up of a short rod 32 and a longer rod 33. Rod 33 is pivotally mounted by means of apin 34 between a pair of perforated lugs 35 formed on cross member 22. The opposite end of rod 33 isthreaded into a cylindrical adjusting member 36. Into the other end of member 36, rod 32 is threaded. The threads in the ends of adjusting member 36 are disposed reversely, as also are the corresporiding threads on rods 32, 33. Hence, rotation of member 36 will serve to draw rods 32 and 33 together, or to spread them apart, depending upon the direction of rotation.

The right end of rod 32 is in the form of a U-shaped fork 37, the slot 38 of which receives the central portion of a stud member 39 `on the die carriage. This `is shown in Figs. 3 and 4 with the parts assembled. The details are clearer in Fig. 5, wherein`the same parts are shown disassembled. Stud 39 may be Amounted in any suitable manner on die carriage 8. As shown, it is provided with ,a cylindrical portion 40 having a force fit with a e corresponding opening 41 uin the die carriage.

Since fork 37 is intended to slide back and forth on the central portion 42 of stud 39, the length of the arms of fork 37 and the depth of central portion 42 are made suicient to prevent disengagement of these parts during normal operation of the machine. Guide walls 43, 43 on stud 39 likewise are made suiciently long to prevent sidewise disengagement between the parts.

In order that sleeve 36 may be secured fast in properly adjusted position, lock nuts 44, 45 are provided for this purpose on rods 32, 33.

In operation, assuming the parts are in the position of Figs. 1 and 2 with the die open and power is applied to drive shaft 14, conneeting rods 20, 20 will move to the right and impart a corresponding movement to cross member 22, die carriage pusher rods 23, 23', and elevator pusher rods 28, 28. As a result, die carriage 8 will be moved to the right on guide rods 3, 3, 3', 3 until movable die part 9 engages fixed die part 5. Simultaneously, goose neck nozzle 10 is raised by the connections described into contact with aperforated nipple plate 46 pivoted on the frame (see solid line position of Fig. 3). Following this, the goose neck, as will appear shortly, has a final upward movement which carries it into registry with the die throughwill act simultaneously f brought together,

'member 22 travels to the right after closing the die. Hence, when the die parts are cross member 22 continuing its movement to the right causes coil springs y27, 27 to be compressed against thedie carriage 8, pusher rods 23, 23' sliding freely x through the diecarrige to permit this action. During this short relative ivement between crossmember 22 and die carriage 8, goose neck 1() moves to the die charging position shown in full lines in Fig. 3. Simultaneously, thegap-between the base of slot 38 of the turn-buckle fork andthe outer end of stud 39. is closed up, and the parts brought` into firm contact, (see dotted line position 0f Fig. 3). In other words` until the strut parts just mentioned come into engagement, the die parts 5, 9 are only held 'together resiliently.

. When the engagement mentioned takes place,

a rigid bracing or locking of the movable die part againstl the fixed die part is effected. This provides for maintenance of the die faces in `lirm engagement with each other, and vsecurely locks the parts in this `condition, until the die operating mechanism is re versed, as will appear shortly. I

Each of the turn- buckle assemblies 31, 31, 31', 31' having been similarly adjusted, they on the entire die carto force all parts of the carriage and the attached die part into engagement with the fixed die part. It is to be noted that the several strut devices are so` located and attached t0 the die carriage, that is, substantially at the corners thereof, that the most effective bracing is accomplished. 0f course, other arrangements of the struts could readily be provided for to accommodate special conditions, such for instance as where die carriages or die parts of peculiar shapes or unusual sizes are used.

After the charge of metal from goose neck 10 has been forced into theclosed die )and permitted to freeze, the die actuating mechanism operates in the opposite direction, carrying connecting rods 20, 20' to the left, t0- gether'with crossV member 22. At a result, adjustable struts 31, 31, 31', 31' start movin to the left away from the die, and goose nec 10 starts to descend towards the position of Fig. 1. kAs crossmember 22 and pusher rods 23, 23' continue their movement to the left, nut 25, 25' engage die carriage 8 and move riage 48 in order it to the left, so as to separate the die lparts -5 and 9. The shortmovement between the completelyclosed position of the die parts and the point at which'nuts 25 engage die carriagefS relieves most of the compression on springs 27, 27', and permits the fork 37 of each of the turn-buckle devices to return to the full line position of Fig. 3. The parts continue their movement to the left, untilthe full-open position of Fig. 1 is reached. The lmachine is now ready or the nextcastiiig operation.

` As explained above, the purposev of the turn- buckle devices 36, 36, 36', 36' is to take care of dies of different thicknesses. In order to accommodate'dies of even greater thicknesses, and to provide for increased range of operation, the arrangement shown in Figs. 6 and 7 has been devised. Here, the lugs 5 on cross member 22 are made wider and are .provided with two sets of pivot pin openings, instead of one. The forward. openings 46 serve for ordinary usage, that is, where dies of 'the more common thicknesses are used; while'ithe rear set of openings 47 may be used to receive the pivot pins 34, when even thicker dies are used. A

A modified forni of the turn-buckle or die locking device 31 is shown in Fig. 8.- With this arrangement, the right hand'portion ofl the adjusting member 36 is 'noty changed in construction, nor is that of the parts between this member and cross member 22. Between adjusting member 36 and die carriage 8, however, the construct-ion is slightly different.. A bracket 48 is threaded into die carriage 8 and is provided with a pair of perforated ears 49 to receive a pivot pin 50. The left end of a rod 51 .is pivotally mounted on pin 50, while the opposite end of the rod is arranged for sliding engagement with an elongated opening 52 in the left end of the adjusting member 36.

In operation, this modified construction functions, to all intents and purposes, 'the same as does the preferred form'of the device. However, instead of providing for the spring take-upto take place adjacent die carriage 8, this is effected between the right hand end of rod 51 and the inner end of opening.52 in .dottedlines at 53. This is the position of the rod both when the die is open and just los before the relative movement between crossf member 22 and die carriage 8 begins during the die closing operation. i

In adjusting the modified form of device, it is merely necessary to back up lock nut 45. Adjusting member 36 may then be manipulated to lengthen orfshorten thel strut, as required. Tlie slidable and rotatablefconnection between member 36 androd 51 permits rotation of member 36, after which it may be secured by lock nut 45.

What is claimed is: .e v 1.- The combination in a die casting machine of a fixeddie part; a movable die part; means for yieldably part into closed position against said fixed die part; and means, adapted to functionafter a predetermined yielding of saidv forcing forcing .said movable die j lmeans, to positively maintain the movable die part in closed position.

2. In a die casting machine, the combination of a separable die, comprising a plurality of die parts; operating means having a yieldable connection with one ofy saidY die parts to move the part between open and closed positions; and means, in addition to said yieldable connection, for positively securing said die part in closed position.

3. In a die casting machine, the combination of a ixed die part; a movable die part; guides for said movable die part; pusher rods for reciprocating said movable die part be- 8. In a die casting machine, the combination of a fixed die part; a die lpart adapted for movement between open and closed positions;

operating means connected directly to said movable die part and including a slidin condie part upon compression of the yieldable 40: connection.

tween open and closed positions; yieldable movement between open and closed positions; connectlons between said pusher rods and the operating means connected directly to said movable die part and means, associated with movable die part and including a sliding con- ,the pusher rods, for engaging the movable nection; and adjustable, bracing means, in

die part and locking it in closed position upon addition to said sliding connection, extending compression of the yieldable connections. between the operating means and the movable 4. In a ldiecastin machine, the combinadie part, for positive engagement with the tion of a.movable i* ie part; guide rods for movable die part only following operation of sald die part; pusher rods for operating said said sliding connect1on when the die closes. die part between open and closed positions; y10. In a die casting machine, the combina- \springs interposed between the pusher rods tion of a fixed die part; a die part adapted for and the die part; and a 'strut movable with movementbetween open and closed positions; the pusherrods and slidablyconnected to the Operating means connected directly to said die part. e movable die part an@ including a yield'able 5. In a` die casting machine, the combina- COHIfeCtOIl with the mOVable die Part; and tion of a fixed die part; a movable die part; a multi-part strut extending between said guides for said movable die part; actuating operating means and the movable die part, means for operating said movable die part said parts having a turn-buckle connection between open" and closed positions; a *yieldwith each other, the` strut being arranged to `able connection between the actuating means engagepthe movable die part positively only and the movable die part adapted for comupon yielding of said connection when the pression immediately following closing of die closes.w

the die; and a strut mounted on said actuat- 11. The combination in a die'casting maing means for rigidly engaging the movable y chine of a movable die part; means connected directly to said die part for operating the die 6. The combination in a machine -ofy the means including a slidable connection with character described of a frame; a xed die the die part; and a multi-part strut extendpart; a reciprocable die part; means for eop- Kingbetwe'en the operating means and the die erating said movable die part between open part, said strut arts being connected together and closed positions; connections between for relatively`7 e adjustment; and a pluralsaid operating means and the movable die ity of spaced connections for the struton part adapted to yield upon closing of the die said operating means, said strut and lthe die t0 permit predetermined independent movepart having normally separated portions ar.

ment of the operating means; and aplurality ranged for positive enga ement with each of struts on the operatingPmeans for rigidly Vother when said'die part 1s moved'to closed securing the movable die part in closed posiposition. f tion at the end of said predetermined movev f 12. In a die casting machine, the combinament of the operating means. ytion of afmovable die part; means connected 7. In a die ca sting machine, the combinadirectly to said die Ipart for operating the die tion of a fixed die part; a dief part adapted part.4 between open and closed positions, said for movement between open and closed posimeans including a yieldable connection; a

part between open and closed positions, said tions; operating means slidably connected to multi-part strut slidably connected to the die said movable die part; and rigid, bracing part and pivotally connected to the operating means for the, movable die part located ony means; and an adjustable connection between said operating means and in addition to said strut parts, said strut being arranged to said slidable connection, said bracing means engage the die part positively only followand the movable die part. having normally ing operation of said yieldable connection separated portions adapted to be brought when the die part is moved to`closed position. into positive engagement with each other 13. The combination in a die casting mawhen the die is closed. chine of a fixed die part; a movable die part;

guide rods on which the movable die part iS mountedmea'ns for operating the movable etween open and closed positions,

said operating with the movable die part adapted to yield following closing ofthe die; and a plurality of adjustable struts extending between the operating means and the movable die, part for engagement when said yieldable connectionsare actuated. 14. The .combination of a movable die part; operating means connected directly to sald die part for moving the die part between.

open and closed positions, said means ineluding a yieldable-conneotion with the die part; a multi-part strut extending between the operating means and the die parte; and an adjusting member having a threaded engagement with one of said strut parts and a sliding connection with the other, said last-mentioned strut part and the adjusting member being arranged to engage positively with each other only upon yielding of said connection when the die is closed.

15. In a die casting machine, the combination of a fixed die part; a movable die part;

with the movable die part f means for operating the movable die part between open and closed positions and adapted to over-travel after the die has fbeen closed; yieldable connections between the operating ,means and the movable die part to permit such over-travel; and locking-means for enaging the movable die part at the end of the over-travel of the operating means.

In .testimony whereof I have signed my name to this specification.`

TORBJ ORN C. KORSMO.

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