US1394561A - Die-casting machine - Google Patents

Description

1. c. KOPF.

' DIE CASTING MACHINE.

APPLICATION FILED OCT. 14. 1920.

1,394,561 Patented Oct. 25, 1921.

5 SHEETS-SHEET I.

f igj.

INVENT R 0. 74/

I ATTORNEY l. C. KOPF.

DIE CASTING MACHINE.

APPLICATION man OCT. 14, 1920.

1,394,561, Patented Oct. 25, 1921.

5 SHEETS-SHEET 2.

L I I 20 Y- x i J. C. KOPF.

DIE CASTING MACHINE- APPLICATION FILED on. 14. 1920.

Patented Oct. 25, 1921.

5 SHEETS-SHEET 3.

J. C. KOPF.

DIE CASTING MACHINE.

APPLICATION FILED 001. I4, 1920.

1,394,561, Patented Oct. 25, 1921.

5 SHEETS-SHEET 4.

ARA/Y I I. c. KOPF.

DIE CASTING MACHINE.

7 APPLICATION FILED OCT. I4, I920. 1,394,561, Patented Oct. 25, 19 21,

5 SHEETS-SHEET 5.

1 ATTORNEY JOHN C. KOPF, OF BELLEVUE BOROUGH, PENNSYLVANIA.

mn-cns'rme MACHINE.

Specification of Letters Patent.

Application filed 0ctober'1 4, 1920. Serial No. 416,876.

.T 0 all whom it may concern:

Be it known that I, JoHN' C. KOPI: a citizen of the United States, and a resident of the borough of Bellevue, in the county'of Allegheny and State of Pennsylvania, haveinvented a new and useful Die-CastingMachine, of which the following is a specification.

The object of the invention is to provide an efiicient machine for die-casting. To this end the invention may be said to (30115181? in the parts, improvements and combinations,

hereinafter described and more particularly pointed out in the claims.

In the accompanying drawings, forming part hereof:

Figure 1 is a central vertical side sectional elevation through the machine and cup containing the charge of molten metal, parts being shown in the early part of the downward stroke with the receptacle sustained somewhat above the die 'and noattempt being made to represent the die cavities; Fig. 2 is a similar view on a larger scale omitting the upper portion of the machine, showing the receptacle forced down tight upon the die and the metal in the act of being expelled from the receptacle; Fig. 3 is a front elevation showing the plunger slightly above the receptacle and the latter seated upon the die, and illustrating the catch for the two-part receptacle in locking position in full lines and in unlocked position in dotted lines; Fig. 4

is a horizontal section, taken directly above the receptacle; Figs. 5 and 7 are plan views of the rear and front halves of the receptacle, respectively; and Figs. 6 and 8 are elevations of the same.

The machine has a frame 1 including a table portion 2 and a rear standard portion 3 rising above the table. The table supports the die 4, the form of which will vary according to the articles to be cast, and which in the illustrated instance may be understood to contain cavities for casting two arti: cles simultaneously. The die has a handle 5 upon its front and can be drawn forward and pushed back along a, key 6 in the table engaging a notch in the bottom of the die. Its working position is determined by an adjustable screw 7 which is held in the rear portion of the frame and abuts the back of the die.

On the upper end of the standard 3 is a 7 power cylinder 8,, containing a piston 9. By

table.

10 and not requiring particular explanation, pressure fluid is admitted and exhausted alternately at opposite sides of the piston to force it downward and upward.

The piston rod 11 extends downward through a stuffin -box 12 in the bottom of the cylinder, an on its lower end is the plunger 13 adapted to enter the cylindrical cavity 14 of a receptacle 15. This receptacle Patented (Oct. 25, 1921.

mally sustained somewhat above the die, and

whereby it is automatically forced down tight upon the die when the plunger descends, and tends to rise automatically when the plunger ascends. In the particular construction illustrated the ends of the receptacle are connected to a pair, of vertical rods 18 which pass downward, vertically guided, through openings in the frame, and are connected beneath the table by a cross-bar 19 resting on adjustment nuts 20. Encircling the upper portions of these rods, between the top of the table and the receptacle, are springs 21, adapted to lift arid sustain the receptacle a distance above the die and break the sprue. The upward movement of the receptacle under the action of these springs is limited by" the contact of the bar with the under part of the table, and" need be slight.

' A two-armed lever 22 fulcrumed at 23 on the standard 3 has a forked slotted end 24 which engagesa pin 25 on the plunger or piston rod, while to its other end is plvoted a rod 26 extending downward below the On the lower part of this rod, supported onan adjustable screw abutment 27, 1s a depressing spring 28. A second twoarmed lever 29 fulcrumed at 30 beneath the table carries a roller 31 at its forward end to bear upon the top of the cross-bar 19, and at its rear end is bifurcated to receive the pressure of the depressing spring through a Ca i 32 thereon. I

he back half 15 of the receptacle is provided on its front, at opposite ends, with pairs of vertically spaced lugs 33 and 33 to receive the upper portions of the rods 18, the ends of which are screw-threaded to engage internal threads in the top lugs. The back half is thus held against swinging movement. The front half 15 has a rear hinge lug 34 at one end, with a circular hole whereby it pivots on one of the rods, between the lugs 33 of the back half. At the opposite end the rear face of the front half has a portion 35, which fits between the lugs 33 and,

which has a notch 36 on its rear face to clear the portion of the rod between. said lugs. The catch 16 comprises an arm, bearing the same numeral in the drawings, pivoted at 37 upon a pin on the front of the part 15 of the receptacle, with its major portion offset forwardly to constitute a handle, and a nose 38 adapted for cam engagement with the notch or hook 39 of a keeper bar 40 screwed to the end face of the rear part 15*.

It will thus be seen that when the piston and plunger are up, the receptacle is sustained somewhat above the die. The charge of molten metal. is introduced into the receptacle atthis time, being retained by an asbestos cup 41, which will presently be described; and the power cylinder is then operated to cause the plunger to descend.

The parts are so proportioned and adjusted that, before the plunger commences to act upon the metal, the rocking of the lever 22 by the piston rod, pulling up on the rod 26,

- shorter springs applies pressure through the spring 28 to the lever 29, so as to cause the latter to draw the receptacle down tight upon the die, against the action of the lifting springs 21. After the receptacle has become seated the depressing spring 28 yields as a cushion during further downward movement of the plunger. The metal having been driven into the die cavities, the cylinder is operated to cause the plunger to travel upward. B

reversal of the operation of the linkage which has been described, this relieves the pressure upon the spring 28, and permits the springs 21 to act upward on the receptacle. These springs are of substantial strength, and their pressure is or may be sufficient to break the sprue. If the sprue is too heavy to be broken in this way, the front of the receptacle is opened, and the die is drawn forward from beneath the receptacle carrying the sprue and heel of the charge with it, after which the sprue is broken with a chisel. When thus withdrawing the die the springs ease up on the receptacle sufficiently to enable the die to be pulled forward easily. When the die is out, the springs hold the receptacle up so that the same or a fresh die can be re-introduced conveniently. By varying the adjustment of the nuts 20 and substituting longer or 21, dies of different heights can be accommodated.

It will be understood that other forms of interconnections between the plunger means and the movable receptacle may be em ployed, and that numerous other changes In. 1y be made without departing from essentia s.

The asbestos cup 41 referred to lines the sides and bottom of the cavity of the receptacle, and serves as a temporary retainer for the molten metal. When ressure is applied by the plunger, it is col apsed and ruptured and the metal is forced out through the gate 16. As the plunger moves downward in the die the lining performs the important function of acting as a acking. It is preferably a complete pre-f drmed cup,

though in some instances an asbestos disk plunger into the die, vertical guides and lifting springs for the receptacle, and means whereby descent of the plunger overcomes said springs and causes the receptacle to seat on the die.

3. A die-casting machine, comprising a frame, a plunger, and, means for operating the same, in combina on with a receptacle from which the metal is forced by the plunger into the die, vertical guides and lifting springs for the receptacle, and conn-errions including a depressing spring whereby descent of the plunger overcomes the lifting springs and causes the receptacle to seat on the die.

4. In a die-casting machine, the combination of a frame, a plunger, a receptacle from which the metal is forced by the plunger into the die, rods connected to the receptacle and passing downward in guided relation in the frame, springs tending to lift the receptacle, and connections between the plunger and said rods, whereby the receptacle is forced downward against its lifting springs when the plunger descends and permitted to rise when the plunger ascends.

5. In a die-casting machine, the combination of a frame, a plunger, a receptacle from which the metal is forced by the plunger into the die, rods connected to the receptacle and passing downward in guided relation in the frame, springs tending to lift the receptacle, a lever connected with the plunger, a rod connected to said lever, a depressing spring on said rod, and a lever arranged to be acted upon by said depressing spring to depress the receptacle rods.

6. In a die-casting machine, the'combination of a frame, a plunger, a receptacle from which the metal is forced by the plunger into the die, rods connected to the receptacle and passing downward in guided relation in the frame, springs tending 'to lift the receptac1e,.a cross-bar on the lower part of said rods, a lever connected with the plunger, a-rod connected to said lever, a depressing spring on said rod, and a lever arranged to be acted on by said depressin spring and having a roller to bear on said cross-bar.

7. In a die-casting machine, the combination of a frame, a plunger, a vertically movable receptacle from which the metal is forced by the plunger into the die, and means comprising springs for lifting" and' depressing and linkage connected with the plunger whereby the receptacle is depressed I when. the plunger descends and rises when the plunger is up.

8. In a die-casting machine, the combination with a die, a receptacle and a plunger, of means for automatically lifting the receptacle to breakthe sprue when the plunger rises.

9. In a die-casting machine, the combination with a'plunger and means for operating the same, of a;vertically guided recep-- tacle from which the metal is forced by the plunger into the die, said receptacle being constructed so as to be opened-and closed,

and spring means and linkage operated by the plun er for urging upward and sustaining t e receptacle and for forcing itthe die when the plunger down tight upon descends.

10. In a die-casting machine, having a die, a plunger, and means-for operatingtth'e same: a split receptacle from which the; metal, is forced by the plunger into the die,

means for vertically guidingpne-half of the receptacle,'the other half belng hinged and having a catch forlocking ,it closed, and

' means for lifting and means for depressing die, a plunger; [and means for operating the receptacle; P

11. In a. die-casting machine, having a the samez a split receptacle frqm whi'ch the I metal is forcedb the plunge'r'into'the die,

vertrcal guide ro s 'ponnecte at their upper .ends to one-half of the receptacle, the other half of the receptaclebeing hinged on one of said rods and having a latch for locking it i closed, springs encircling saidrods to lift the receptacle, and means for depressing the re- .ceptacl upon thedi'ej when the? plunger deiscends. l

12. In a'di e-casting machin are conhbina tion with a plunger and a receptacle from which the metal is forced by the plunger into the die, of means whereby the receptacle is automatically depressed upon the die when the plungerdescends and urged 'up-. ward when the plunger rises.

13. In a die-casting machine, the combination with a plunger and a receptacle from which the metal is forced by .the

plunger into the die, of linkage operated by the "plungevand spring means, whereby the a receptacle is automatically depressed when the plunger descends and urged upward when the plunger rises.

14. In a die-casting machine, a supporting frame, a die,.a plunger, and a vertically movable guided receptacle, from which the plunger forces the metal into the die.

15. Im a die-casting machine, a supporting frame, a die, a plunger, a vertically mov- I able receptacle from which the plunger forces the metal into the die, and means for raising said receptacle from the die to break the sprue. I

16. In a die-casting machine, a supporting frame, a die, a plunger, a vertically movable receptacle from which the plunger forces the metal into the die, and means for raising and lowering the receptacle.

'17. In a die-casting machine, a supporting frame, a,die, a plunger, "a, vertically movrable receptacle from which the plunger forces the metal into the die, and a fluidpressure cylinder operatively connected with said receptacle.

" 18. In adie-casting machine, having a diet and plunger, a vertically movable re ceptacle from which the metal isforced by the plungerinto the die, and means for lifting the receptacle to break the for seating the same again upon 19. In a die-casting machine, a table, a die thereon, a plunger, a vertically movable re: 'c'eptacle between the die' and plunger, and guide rods for the receptacle passing down- Wigid at opposite sides of the die below the t3, e. i

20. In a die-casting machine, a table, a

die lthereon, a plunger, a vertically movable receptacle between the dieand plunger,

rue and :iie die.

Images