US2078611A - Die casting machine - Google Patents

Description

April 27, 1937. v. J. SEBEK 2,078,611

DIE CASTING MACHINE Filed July 29, 1955 l ATTORNEY:

Patented Apr. Z7, 1937 UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to die casting machines and has particular reference to improved mechanism for feeding molten metal from a melting pot or other heated container to a suitable die or mold with the aid of compressed air.

One of the objects of my invention is to provide a swingingly mounted ladle and manually operable means for dipping the ladle into the molten metal in the melting pot for charging the ladle with the molten metal and counter-weighted means for moving and returning the ladle to operative position with its mouth accurately aligned with the gate or opening of a die or mold whereby compressed air may then be forced into the ladle to deliver the charge of molten metal into the die.

Another object of my invention is found in the provision of an adjustable counter-Weight for regulatingthe pressure with which the mouth or nozzle of the ladle is brought into contact with the gate or die opening.

A further object of the invention is found in the'provision of adjustable means for accurately and positively controlling the vertical alignment of the discharge mouth of the ladle with the gate or die opening.

A still further object of my invention resides in the construction and arrangement of a mechanism embodying a single manually operable lever for moving the charging ladle into filling position and counter-Weighted means operable upon the release of said lever for raising the ladle and positively locking same in aligned position with the opening of the die or mold. Y

A further object of the invention is found in the arrangement of adjustable means for accurately controlling the lateral adjustment of the toggle locking means for the ladle so that the discharge mouth or nozzle of the ladle may be squarely and tightly held against the opening into the die. Y

vWith the above and other objects in view, my invention consistsiin the novel combination, construction'and arrangement of the parts and members shown in preferred embodiment in the attaohed drawing, described in the following specifications and particularly pointed out in the appended claims.

Referring to the illustrations:

Fig. l is a plan view of a portion of a die casting apparatus embodying my invention.

Fig. 2 is a vertical section taken on line 2--2 of Fig. 1, showing the discharging position of the ladle and also showing by dot and dash lines, the charging or lling position of the ladle and mechanism therefor.

Fig. 3 is a sectional plan view on line 3-3 of Fig. 2.

Referring now to the illustrations in more detail, a molten metal pot I is provided which is suitably held into position within the furnace I having a lining l2 of re brick, or the like.

The gate-opening for the die or mold is indicated by I3.

The ladle or molten metal carrier |4 is provided with an inlet connection |4A for compressed air and with a mouth or nozzle I4B.

The upper part of the ladle I4 is also provided with an upwardly and forwardly disposed integrally cast arm HlC having a connection on the shaft I 5 which is provided with enlarged ends or rollers ISA which are securely held and guidedV laterally in the recesses I6A of an adjustably mounted U-shaped yoke I6 when the ladle is in discharging position at the die opening I3.

The yoke |6 is vertically adjustable by means of a screw IBB which is mounted in the support IGC and a lock nut IED is provided for the screw IEB. The rear end of the yoke is slidably mounted on the guide |613.

At its upper and rear end, the ladle I4 is cast with a pair of hook-like ears HID which open on their lower sides for hook-support upon the lateral pin II which is pivotally carried within the lower ends of the links I8. The upper ends of the links I 8 are rigidly fixed to the cross shaft I9 which is supported upon the cast-iron stands 20.

Supported iny bearings 2| on the rear end of the furnace II is a shaft 22 which is operatively connected to the pin l1 by means of a toggle which comprises a crank 23, one end of which is rigidly fixed to the shaft 22 and the other end of which pivotally embraces the pin 24. The pin 24 is pivotally connected to the pin Il by means of a pair of links 25.

The bearings 2| for the shaft 22 and toggle are laterally adjustable by means of a screw 26 and stud bolts 21 to insure a tight and accurate engagement of the ladle mouth or nozzle I4B with the die opening i3.

The ladle I4 is held in positive discharge position, as shown by the full lines of the illustrations by means of counter-weights 28 which are adjustably slidably mounted upon the outer ends of the bars 25, the inner ends of which are provided with recesses 2$A and adapted to receive in such recesses the rollers or ends I5A at the upper end of the arm I4C when the ladle I4 is moved to lling position.

The bars 29 are pivotally mounted on a shaft 3G which is supported at the upper ends of the stands 20. The bars 29 are also formed with upwardly extended portions 29B having hook-like ends 29C constituting stops which limit the downward movement of the ladle when such stops engage upon the top of the yoke I6.

The shaft 22 is extended on one side to provide a connection for the operating lever 3| which is rigidly fixed thereto.

In the illustrations, the ladle I4 is shown in operative position to discharge its contents of molten metal through its nozzle MB into the die opening I3 and as above pointed out, the nozzle IABis held tightly against the die opening I3 by means 5 of the toggle at its rear end.

The nozzle IilB is also held in proper or accurate vertical alignment with the die opening I through the instrumentality of the ladle arm IIC.`

and its cooperating supporting yoke IS. It is readily apparent that the vertical adjustment of the nozzle HiB may be controlled by the adjustment screw ISB which controls the position of yoke I6.

The operation of lling the ladle I4 with the molten metal in the Apot Iii may be described as follows:

An upward movement of the free end of the operating lever 3| into the position shown by dotted lines in Fig. 2, will cause a break in the toggle by reason of the upward movement of the crank 23 which is rigid with the operating shaft 22 and through the links 25 will cause a rearward movement of the ladle Ill. In such initial rear- Ward movement, the ladle nozzle IB will be 25 moved substantially laterally and downwardly away from the die opening I3. During such movement, the ladle I will be supported at its rear end upon the pivotally mounted links I8 and the upper end of the rear of the ladle will oi course move in a slight arcuate path about the pivot pin I9. The upward movement of the oper ating lever 3l will support the front end of the ladle in recesses 23A of the bars 29 and will lift the counter-weights 28 on the opposite ends of the bars 2d to the position shown in dotted lines in Fig. 2, and will cause a downwardly and rearwardly movement of the ladle I d to the lling position shown by the dotted lines wherein the greater portion of the ladle Ill will be submerged in the molten metal in the pot l@ to permit a flow of the molten metal into the ladle I l through its nozzle IflB. The toggle links 25 and crank arm 23 will assume the positions shown by the dotted lines when the ladle I4 is in its filling position.

When the ladle I4 has been 'filled with the molten metal, the raised operating lever 3i may be gradually allowed to lower under the downward pressure of the counter-weight 28 and the several parts and members will again be brought into the positions shown by the full lines in the drawing wherein the mouth or nozzle IB will be brought into accurate position against the die opening I3. The .contents of the ladle I 4 :may 55 then be discharged through the nozzle IAB into the die by compressed air passed through the ladle opening IIIA.

I claim:

1. In die-casting apparatus, the combination 60 of a molten metal container, a ladle having a discharge nozzle and adapted to be lled with molten metal from said container through said nozzle, a support mounted on said container and extending above said container, a pair of links 55 pivotally mounted on said support for pivotally supporting the rear end of said ladle, means pivotally mounted on said support above said container having a recess at one end thereof and a counter-weight at the other end thereof, an 70 extension on the front end of said ladle, operable means on said container connected to said ladle and adapted upon movement in one direction to resist the pressure of said Counter-Weight and to cause a rearwardly and downwardly movement of said ladle into iilling position within said container, the extension on the front end of the ladle being supported within the recessed end of said counter-weighted means during the iilling of said ladle, and a vertically adjustable stationary support mounted on one end of said container adapted to receive and support said ladle front extension during the discharging operation of the ladle, said counter-weighted means tending to retain said ladle in raised position.

2. In ,die-casting apparatus as embodied in claim 1, and including an extension on said counter-weighted means adapted to en-gage said vertically adjustable stationary support on said container for limiting the uppermost movement and position of the said nozzle to thus accurately align the discharge mouthof the nozzle with the inlet opening of the die. Y

3. In die-casting apparatusl as embodied in claim 1, and including a pair of spaced abutments on one end of said counter-weighted means cooperating with said vertically adjustable stationary support on said container for limiting the uppermost and lowermost movements and positions of the said nozzle.

4. In die-casting apparatus, and in combination, a molten metal container, a ladle having a discharge nozzle, a pair of supports, one on each side of said container extending above the f3 top of said container, pivotal means supported on said supports for pivotally supporting the rear end of said ladle, a counter-weighted pair of arms pivotally supported on said supports above said ladle, a counter-weight adjustably mounted on fsaid counter-weighted arms, said counter-weighted arms being adapted to retain the forward or front end of said ladle in raised discharging position, an operating lever operatively connected to said ladle and adapted to be moved to resist the pressure of said counter-weight to cause a rearwardly and downwardly movement of said ladle into lling position within said container, an extension rigidly connected to said ladle arranged to cooperate with said arms to support the front end of said ladle on said arms during the filling operation thereof, and stationary means mounted on one end of said container adapted to receive said extension to thereby support said ladle in discharging position.

5. In die-casting apparatus, and in combination, a molten metal container, a ladle having a discharge nozzle, a support on said container, pivotally mounted means supported on said support for supporting the rear end of said ladle, a pair of counter-weighted arms pivotally mounted on said support above said ladle and arranged to support the front end of said ladle during its movement into and out of filling position, a lever operatively connected with said ladle and adapted upon movement in one direction to resist the pressure of said counter-Weighted arms during the rearward movement and tilting of said ladle into filling position, a stationary seat mounted above said ladle on the structure of the apapratus, an extension on the front end of said ladle adapted for support on said seat, and integral extensions of said arms having spaced abutments adapted to alternately engage opposite portions of said stationary seat for limiting the uppermost and lowermost positions of the ladle.

VLADIMIR J. SEBEK.

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