US2018566A - Casting machine - Google Patents

Description

Oct. 22, 1935. G. NYSELIUS CASTING MACHINE Filed Oct-21. 1932 2 Sheets-Sheet 1 IN VEN TOR.

a ATTORNEY 00L 1935- G. NYSELIUS CASTING MACHINE Filed Oct. 21, 19.32

2 SheetsSheet 2 INVENTOR. uATow \mxull BY a JW\NN m ATTORNEY Patented Oct. 22, 1935 UNiTED STATES "PATENT OFFICE CASTING MACHINE Gustav Nyselius, New York, N. Y.

J Application October 21, 1932, Serial No. 638,885

4 Claims.

This invention relates to press casting wherein molten metal is forced under pressure into the casting mold.

In accordance with present press casting prac- 5 tice, a cylindrical compartment is usually provided for receiving the molten metal and this compartment communicates near one end with one or more passages leading to the molds. The molten metal is introduced into the compartment and is forced out through the passages by a piston. Upon completion of the casting stroke there generally remains in the compartment a small quantity of metal which has not been forced out and one important object of the present invention is the provision of an improved means for removing this superfluous metal.

For this purpose in the present embodiment of my invention, I provide a vertical cylinder or compartment having lateral passages communieating with the molds and the plunger for forcing the metal into the molds enters the cylinder through the top of the compartment. The bottom of the compartment is movable, being preferably formed by a piston which extends into the cylinder from the bottom. This piston during the casting stroke is positioned immediately below the lateral passages leading to the molds. After completion of this stroke the plunger and piston with the intervening disc of superfluous metal that remains in the compartment after the casting operation move downwardly together through the cylinder and the disc of metal is brought to a point in the cylinder where it is i ejected laterally by a pusher bar, or preferably by air pressure, the disc falling out of the machine through a suitable discharge opening.

In this form of my invention both piston and cylinder are hydraulically operated and, if desired, the operating means for the piston may be automatically controlled in response to the movements of the plunger.

Other objects of my invention will appear from the following description taken in connection with the accompanying drawings wherein:

of a press casting machine embodying one form of my invention;

Figure 2 is a side elevation partly in section of the structure shown in Figure 1;

Figure 3 is a horizontal sectional view taken on the line 3-3 of Figure l; and

Figure 4 is a view similar to Figure 3 but showing a modification.

Refen'ing to the drawings, the machine-has a frame l0 comprising a base casting H, which carries 2. depending cylinder casing i2, an intermedi ate casting l3 having pillars it upon which is mounted an upper cylinder casing IS. The intermediate casting I3 is formed with a central upwardly extending portion l'l having a vertical Figure 1 is a front elevation partly in section bore or opening 18 therethrough which is continued down through the base casting II. This opening is closed at the bottom by a piston 20 which is adapted to be moved by hydraulic pressure in the cylinder l2.

The bore it above the piston 20 in the position of parts shown in Figure 1 forms a cylindrical compartment 26 into which the molten metal to be cast is poured prior to the casting operation. Extending through the side walls of the compartment 26 at its bot-tom are one or more bushings 28 having central openings 29 which communicate with similar openings in the nipples 30 forming part of the casting molds. I have shown conveniently in Figure 2 at 32 one of the molds which is carried by. a plate 33 adapted to slide on bars 34 forming part of the frame of the machine. It will be understood that the mold is moved into the position shown in Figure 2 when the casting operation is to be performed and after casting the mold is withdrawn, opened and the casting extracted. A plunger 38 is adapted to be forced downwardly into compartment 26 by hydraulic pressure in the upper cylinder l5 and this forces the molten metal contained in the compartment 26 through the openings 29 into the molds.

Communicating with the bore [8 at a point some distance below the opening 29 is a disc discharge opening 40 which extends downwardly through the casting l3 and also through the casting i I to the outside of the machine. At a point diametrically opposite the opening 40 the casting I3 is formed with an opening 42 in which slides a pusher bar 43 having formed thereon at one side a rack 44 adapted to be actuated by a pinion 45 secured to a vertical shaft 41 mounted in bearings 48 on the casting l3. Shaft 41 is provided with a handle 46 for turning the same.

In Figure 4 I show a modified means for ejecting the disc wherein air under pressure, from a suitable source, passes through pipe I0 into a lateral passage ll through the upwardly extending portion I1 and discharges against the disc thus blowing it into the discharge opening 40.

While various controlling means may be employed for actuating the pistons I5 and 28 I show in Figure 2 a convenient arrangement of valves and passages to the cylinders of these respective pistons. Theinterior of the cylinder l2 communicates at its bottom with a supply and discharge passage 50 and a lock valve 52 normally in its lower or closed position and adapted to be raised by a lever 53 to open the passage 50.

Communicating with the passage 50 is a pipe 13 which leads to a valve designated generally by the reference character 14. Valve 14 comprises a casing 15 having four openings arranged at right angles to one another. These openings communicate respectively with the pipe 13, pipes 16 and 11 which are discharge or return pipes and pipe 18 which is a supply pipe. Inside the casing 15 is a rotary valve member 19 which is provided with a straight bore extending diametrically therethrough and on opposite sides of the bore, with cutaway portions iii. In the position of the valve shown in Figure 2 one of the cutaway portions forms a communication between pipe 13 and return pipe 16 and the other a communication between supply pipe 18 and return pipe 11. By rotating the valve member 19 in a clockwise direction bore 80 is brought into alignment with pipes 13 and 18 and communication between these pipes established.

Pipe 18 leads to a source of hydraulic pressure, such as a pump and the valve construction shown in Figure 2 is particularly adapted for use with a pump which requires a constant flow or circulation of the liquid. 7

Cylinder l5 has at each end, a supply passage 60 and a discharge passage SI and flow Irom these passages is controlled by a valve 62 which in its lowered position shown in Figure 2 opens the supply passage at the top of the cylinder and opens the discharge passage at the bottom of the cylinder and in its lowered position opens the.

supply passage at the bottom of the cylinder and the discharge passage at the top with the result, in the later case, that the piston 38 is raised.

In operation, molten metal to be cast is poured into the compartment 26, piston 38 being raised out of compartment 26. Piston 20 also occupies its raised position, as shown in Figure 1, its top being immediately below the lateral passage 29. Lock valve 52 is closed and valve 14 is in the position shown in Figure 2. Fluid pressure is then admitted through the upper passage 60 to the cylinder IS with the result that piston 38 moves downwardly into the cylindrical compartment 26 and forces the molten metal through the passage 29 into the mold. During the casting stroke, the lower end of piston 38 moves down to approximately the level of the opening 29 and on completion of this stroke, the discharge passage 50 of the lower cylinder I2 is opened by raising lock valve 52 with the result that piston 20 is forced downwardly by the downward movement of piston 38, which pressing down on the small disc of metal remaining in the compartment 26 after the casting stroke, breaks the disc from the runner of metal in the opening 29 and moves the disc downwardly through the bore Hi to the point 65 (Figure 2). In this position of the disc it will be noted that both pistons are in their lowermost position and the disc is positioned between the pusher bar 43 on the one side and the opening 40 on the other. Piston 38 is then raised to free the disc which is pushed out into the discharge opening 40 by movement of the bar 42 or blown out by compressed air through the passage 1 I. I have shown in dotted lines in Figure 1 the pusher bar in its advanced position and a disc of metal falling through the opening 40. Piston 20 is then raised to the position shown in Figure 1 preparatory to a new casting operation, this being accomplished by raising the lock valve 52 and turning member 19 of the valve 14 in a clock wise direction to open communication between the supply pipe 18 and pipe 13. A safety valve 84 in the pipe 13 prevents excessive back pressure on the hydraulic pump during the short time after the piston 20 is raised and before the valve 14 is returned to the position shown in Figure 2.

I claim:

1. A casting machine comprising a cylinder adapted to receive molten metal to be cast and 4 having a lateral opening in the wall thereot a plunger movable into one end. of said cylinder for forcing the molten metal through said opening to the mold, a piston closing the opposite end of said cylinder. a pusher rod slidable laterally into and out oi said cylinder and located at a point removed, along said cylinder, from said lateral opening, means forming a discharge passage communicating with said cylinder opposite said pusher rod, means for moving said.15 plunger into and out of said cylinder, means for moving said piston between a position in which it closes said discharge passage and in which its end is adjacent said lateral opening and in a position in whichsaid discharge opening is uncovered and means for operating said pusher rod.

2. A casting machine comprising means forming a vertical cylindrical compartment for receiving molten metal to be cast, and a passage communicating with said compartment, means for forcing molten metal from said compartment through said passage to a mold with a small quantity of metal remaining in said compartment and passage, means for separating the metal remaining in said compartment from that remaining in said passage and for removing it vertically from said compartment and fluid pressure means for laterally ejecting the said remaining metal.

3. A casting machine comprising a cylinder adapted to receive molten metal to be cast, and having a lateral opening in the wall thereof and a second opening spaced from said first named opening longitudinally of said cylinder, a plunger movable into one end of said cylinder for forcing molten metal contained in said compartment through said first named opening into a mold, means for forming a discharge passage, communicating with said cylinder opposite said sec- 45 0nd named opening, means for moving! said plunger into and out of said cylindenmeans for moving said piston between a position in which it closes said discharge passage and in which its. end is adjacent said first named lateral opening and in a position in which said discharge passage is uncovered and means for forcing air through said second named opening to blow said disc into said discharge passage.

4. A method or casting through a passage extending laterally from the interior of a cylinder, said cylinder having pistons extending into opposite ends, which method consists in pouring the material to be cast into said cylinder while maintaining one of said pistons in a position at one side of and closely adjacent to saidpassage, moving said other piston inwardly from the opposite side of said passage to force the material through said passage, continuing the motion of said other piston, while moving the one piston in the same direction, to break the surplus material in said cylinder from the material in said passage and removing said surplus metal from between said pistons, said one piston at no time covering said passage. to

GUSTAV NYSELIUS.

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