SU425723A1 - MECHANISM OF PRESSING FOR THE CASTING MACHINE BY PRESSURE - Google Patents

Description

one

The invention relates to the field of foundry, in particular to press-casting machines.

The known press mechanism of the machine is molded under pressure, soda, rzhash; its hydraulic cylinder of the drive, on the stem of which the telescopic external and internal pressing pistons and the auxiliary cylinder are mounted, prevents the pressing of the metal at the right moment.

In order to regulate the moment of insertion of the pressing in the proposed mechanism, the working cavity of the auxiliary cylinder is connected through a channel made in the rod to the rod of the hydraulic cylinder of the drive connected to the drain line via a pressure regulator.

FIG. Figure 1 shows the proposed pressing mechanism in the initial position; in fig. 2 - the same at the time of pressing; in fig. 3 - the same at the time of pressing; in fig. 4 - the same, at the moment of extraction of the internal press-piston from the press-residue; in fig. 5 - the same, at the moment of pushing out the press residue; in fig. 6 - the same at the time of lubrication.

The pressing mechanism comprises a hydraulic cylinder of the drive 1 and an auxiliary cylinder 2 with a housing 3 mounted on the end face of the rod 4.

To piston 5 of auxiliary cylinder 2

by means of a hollow rod 6 an external press-piston 7 is attached, in which an internal press-piston 8 mounted on a rod 4 is telescopically mounted.

The cavity A of the auxiliary cylinder and the cavity B of the main cylinder are connected by a channel a, made in the rod 4.

To limit the stroke of the piston 9, an adjustable stop 10 is installed to the right, which allows the outer press piston 7 and the inner press piston 8 to be extended from the pressing chamber 11 for assembly and disassembly when they are replaced.

The stroke of the rod 4 to the left is limited by the stop 12. The control of the main hydraulic cylinder is carried out by the distributors 13 and 14.

A pressure regulator 15 is installed at the moment of repressing to create a backpressure of the fluid when draining from cavities A and B.

In the initial position, i.e. with the press-piston retracted, the working fluid is supplied to cavities A and B via distributor 13, and cavity C is connected to the drain through distributor 14.

After a portion of the metal is poured into the pressing chamber 11, the working fluid through the distributor 14 is fed into the cavity B. The cavities A and B remain connected to the flow line through the distributor 13.

When the stem 4 is moved to the left, it moves the inner press lorshen 8 together with the outer press piston 7. The ends of these pistons are in the same plane and are filled with the molten metal cavity of the mold (not shown). At the same time, the working fluid from cavity B is displaced into the pressure line. After the cavity of the mold is filled with metal, the external press piston 7 and the internal press piston 8 are stopped. The pressure of the liquid in the cavity B and the pressure line is equalized. This position of the press pistons is retained for some time (until a hard crust appears on the casting). Cavities A and B are then connected to the drain via distributor 13 and pressure regulator 15.

When the working fluid is discharged through the pressure regulator 15 in cavities A and B, they create a support that provides sufficient force on the external press bale 7, which prevents it from moving to the right. At this time, the scraper 4 moves to the left, inserting the inner press piston 8 into the press balance (not shown). The process of repressing.

After crystallization of the press residue, the fluid from the cavities A and B is stopped through the distributor 13 and the pressure regulator 15, and the working fluid is supplied to the cavities A and B through the distributor 13.

Since the total working area of the auxiliary cylinder 2 and the hydraulic cylinder 1 on the side of the rod 4 is larger than the working area of the piston 9, the rod 4 will move to the right by the amount of internal press piston 8 inserted into the press balance. In this case, the working fluid from the cavity B is forced out into the pressure line 16.

During the opening of the mold, the external press piston 7 and the internal press bushing

8 is moved to the left until the piston 5 stops against the stop 12 and the press residue is pushed out of the mold. Cavities A and B are then connected to the drain via distributor 13 and pressure regulator 15. Stem 4 will move to the left by the stroke of piston 5 and slide the inner press piston 8 out of the outer press piston 7. They can be lubricated in this position.

After the completion of the lubrication operation, the liquid enters the cavities A and B through the distributor 13, and the cavity B through the distributor 14 is connected to the drain. The rod 4 moves to the right until the adjustable stop 10, and the outer

press piston 7 and internal press piston

8 will occupy the original position in which they

The ends are located in the same plane. After

this cycle of operation is repeated.

To assemble and disassemble the outer press 7 and the inner press piston 8, the adjustable stop 10 is moved to the right and the outer 7 and 8 inner press pistons are removed from the press chamber.

Subject invention

Pressing mechanism for die casting machine containing hydraulic cylinder

an actuator with a drain line, on the stem of which there are telescopic external and internal pressing pistons and an auxiliary cylinder with a working cavity, characterized in that, in order to regulate the moment of pressing in, the working cavity of the auxiliary cylinder is connected through a channel made in the rod, with a rod cavity drive cylinders connected to a drain line

through pressure regulator.

23

five

ten

FIG. 2

(Rig.

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