US2829409A

US2829409A - Die casting apparatus

Info

Publication number: US2829409A
Application number: US552799A
Authority: US
Inventors: William C Frommer
Original assignee: Star Expansion Industries Corp
Current assignee: Star Expansion Industries Corp
Priority date: 1955-12-13
Filing date: 1955-12-13
Publication date: 1958-04-08
Anticipated expiration: 1975-04-08

Description

Ap 8, 1953 w. c. FROMMER DIE CASTING APPARATUS- 4 Sheets-Sheet 1 Filed Dec. 15, 1955 INVENTOR. v #44 1/4 4. Fran/v5? BY April 1958 w. c. FROMMER 2,829,409

DIE CASTING APPARATUS Filed Dec. 15, 1955 4 Sheets-Sheet 2 otmwfv April 8, 1958 I w. c. FROMMER 2,829,409

DIE CASTING APPARATUS Filed Dec. 13, 1955 4 sh ets-sheet s INVENTOR. fizz/4w dfF M/VER April 1953 w. c. FROMMER 2,829,409

DIE CASTING APPARATUS Filed Dec. 15, 1955 4 Sheets-Sheet 4 W 35 "LEE P I v k INVEN TOR. a #24149 {7900/4677 DIE CASTING APPARATUS William C. Frommer, Elizabeth, N. J., assignor to Star Expansion Industries Corporation, New York, N. Y., a corporation of Delaware Application December 13, 1955, Serial No. 552,799

1 Claim. v(Cl. 22-93) Ihis invention relates to die casting apparatus and particularly to apparatus for casting a plurality of groups of multiple units of articles having internal threads therein.

The die casting unit comprises a movable die and a closure or stationary die, the die member in which the threaded articles are to be cast having threaded cores therein, and means for rotating the cores when the dies have been separated whereby the castings will be ejected from the mold cavities in the die.

The invention has for its salient object to provide apparatus of the character described in which the mold cavities are disposed in the movable-die and the threaded cores can be rotated to eject the castings when the movable die is opened or moved away from the stationary die or closure.

Another object of the invention is to provide apparatus of the character described so constructed that a plurality of groups of units can be cast simultaneously.

Another object of the invention is to provide apparatus of the character described so constructed that a plurality of groups of units can be cast simultaneously and can thereafter be ejected simultaneously.

Further objects of the invention will appear from the following specification taken in connection with the drawings which form a part of this application, and which Fig. 1 is a plan view of apparatus constructed in accordance with the invention;

Fig. 2 is a plan view of the apparatus showing the movable die in open position and illustrating diagrammatically the means whereby the driving connections between the core driving mechanism and the threaded cores will be set in operation when the movable die is opened;

Fig. 3 is a view, partly in plan and partly in section, showing the movable die and the driving connections for the threaded cores therein;

Fig. 4 is a face view of the movable die, parts being omitted for the sake of clearness, and illustrating the driving connections for the threaded cores;

Fig. 5 is a plan view of the multiple unit casting made in the apparatus;

Fig. 6 is an elevational view of one of the units cast; and

Fig. 7 is a sectional elevation of the casting shown in Fig. 6.

The invention, briefly described, consists of die casting apparatus comprising a die casting unit and mechanism connected thereto for rotating the threaded cores in the die to eject the castings from the mold cavities. The die casting unit comprises a movable die which is movable toward and away from a stationary die, the mold cavities being formed in the movable die and the molten metal being introduced through a gate in the stationary die into the mold cavities under pressure when the movable die is closed upon the stationary die or closure. The gate is disposed centrally in the movable die and the mold cavi- 2 ties and passages thereto for forming the groups ofunit are disposed laterally of the gate.

The apparatus further comprises core driving mechanism which is so operated and so connected to the threaded cores in the movable die that when the movable die is opened the connections to the core driving mechanism are closed, thereby operating the driving connections and rotating the cores in a direction to eject the groups of cast units from the movable die.

Further details of the invention will appear from the following description.

In the particular embodiment of the invention illustrated in the drawings, the die casting apparatus is shown at A and the core driving mechanism is shown at B,

these parts of the apparatus being disposed side by side.

The die casting apparatus A is mounted on .a base 10' and comprises a movable die 11 carried by a block 12 slidably mounted on

rods

13 and 14. The die casting apparatus further comprises a stationary die 15 which is carried by astationary block 16 mounted on the

rods

13 and 14.

The block 12 and the movable die 11 are moved toward and away from the stationary die by means of a rod 20 which is connected by suitable toggle mechanism, not

shown, to a plunger rod 21 which extends into a pneumatic cylinder 22. This cylinder has a piston therein which-is operated pneumatically in the usual manner and moves alternately in opposite directions by a suitable control mechanism to close and open the movable die. It will be understood that the rod 20 and piston rod 21 are slidable through suitable bearings.

The construction of the movable die is shown particularly in Figs. 3 and 4. As shown in Fig. 3, the stationary die 15 has a central opening or gate 25 theretbrough, and the molten metal under pressure is introduced into the gate 25 through a suitable conduit or nipple 28. As shown in Fig. 4, the gate 25 communicates with conduits 26 and 27 extending laterally from the gate and each of these conduits has a series of

branch conduits

30, 31, 32, 33 and 34 which extend laterally from the conduits 26 and 27 and communicate with mold cavities 35. In each of the mold cavities there is disposed a threaded core pin 36 which is carried by a spindle 37. On each of the spindles 37 on one side of the gate there are mounted gears 38 which mesh with a gear 39 mounted on a spindle 40, which also has mounted thereon a gear 41 which meshes with a gear 42 carried by a spindle 43. The spindle 43 has a sprocket 44 which is driven by a chain 45, which is also mounted on a sprocket 46 splined to a shaft 47 of the core driving mechanism B.

The gear 42 also meshes with a gear 50 mounted on a spindle 51, which has also mounted thereon a gear 52 which corresponds to the gear 39 on the spindle 40. Gear 52 meshes with gears 53 on spindles 54 which carry the threaded core pins in the unit at the other side of the gate 25.

After the movable die has been closed by being moved to position against the stationary die, the molten metal is introduced through the conduit or nipple 28 into the gate 25 and is forced laterally through the conduits or grooves 26 and 27 and into the branch conduits from which the metal passes into the mold cavities. After this operation has been completed, the movable die is moved away from the stationary die and, in a manner hereinafter described, the driving connections for the core rotating mechanism are closed and the cores are rotated in a direction to eject the castings from the mold cavities.

The core driving mechanism will now be described. The shaft 47 is mounted in suitable bearings 60, 61 and 62 on a base 63. The sprocket 46 on the shaft 47 is mounted on or carried by a grooved collar 65. A forked thereon a pulley 72 driven from any suitable source of.

power. Shaft 47 also has mounted thereon a brake 73.

The driving connections for operating the clutch and the brake are shown diagrammatically in Fig. 2. A switch 80, has a switch operating "pin 81- disposed in the path of movement of an abutment 82 carried by the block 12. As the movable die 11 moves: to open position, as shown in Fig. 2, the abutment 82 will cause the pin 81 to close the switch 80, thereby connecting the power line shownat 83 and 84 toleads 85 and 86 which are con nected to a solenoid valve 87. This valve is connected to an air pressure conduit 88 and when the switch 80 is closed the solenoid is operated to cause the valve to open, permitting, the air from the air pre sure line 88 to enter a conduit 89 from which air is conducted through a branch conduit 90 to the clutch 70. Moreover, the conduit 89 is connected to the brake 73.

Thus, when the movable die opens, the switch S9 is closed,.energizing the solenoid valve 87 and causing this valve to connect the air pressure line 88 to the conduit 89 and branch conduit 90, closing the clutch 70 which is normally open, and releasing the brake 73 which is normally closed. Since the chain45 which drives the connections for the threaded core pins is mounted on a sprocket 46 which is splined to the shaft 47, and since this sprocket is carried by the collar 65 which in turn moves with the movable die, the chain 45 can drive the core pins to eject the castings when the movable die is opened.

Although one specific embodiment of the invention has been particularly shown and described, it will be understood that the invention is capable of modification and unit comprising a movable die having mold cavities there.

in, rotatable threaded core pins in the mold cavities, and a stationary die closure, said operating unit having a splined drive shaft and being positioned alongside said die casting unit, a sprocket splined to said shaft, means on said movable die for connection by a chain to said sprocket for rotating said core pins, and bracket'means connected to the movable die for moving said sprocket along the splined shaft on the operating unit as the movable die moves away from the die closure to maintain the driving connection between said units in any position of said movable die.

References Cited in the file of this patent UNITED STATES PATENTS McIntosh Nov. 22, 1938 2,137,539 2,154,745 Hedgpcth Apr. 18, 1939 2,217,661 Anderson Oct. 15, 1.940 2,327,665 Peat Aug. 24, 1943 2,384,809 Bullard et al Sept. 18, 1945 2,391,527 Tracy Dec. 25,-1945 2,441,525 Zesbaugh May 11, 1948 2,454,561 Lester Nov. 23, 1948 2,483,094 Harvey Sept. 27, 1949 2,513,216 Sullivan et a1. June 27, 1950 2,579,952 Morin Dec. 25, 1951 2,583,093 Emmert et al. Jan. 22, 1952 FOREIGN PATENTS 510,668 Great Britain Aug. 4, 1939 979,960 France a- Dec. 20, 1950