SU1291281A1 - Metal-pressing device for die-casting machine - Google Patents

Description

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The invention relates to foundry, in particular to injection molding.

The aim of the invention is to improve the quality of castings.

The drawing shows the proposed device, the cut.

A device for pressing the metal of an injection molding machine includes a ram cylinder I, in which a piston rod 2 with piston 3 is placed. On piston rod 2 there is a piston 4 that moves freely on it, forming a cavity 5 with piston 3, which is connected through radial 6 and 7 and axial 8 channels in rod 2, bore in sleeve 9 with bore 10 in the cylinder body 1. The bore 10 through channel 11 in the body of the cylinder 1 is connected to the control valve 12 connected to the gas pressure source and the atmosphere. The sleeve 9 is mounted on the rod 2 and interacts with the seal 13 installed in the bore 10 of the body of the power cylinder 1. The rod 2 is connected with a pressing piston installed in the pressing chamber (not shown). The piston cavity 14 of the power cylinder 1 is connected to the control distributor, the hydraulic accumulator and the multiplier, and the rod 15 is connected through the control distributor to a source of fluid pressure and a drainage reservoir (not shown).

The device works as follows.

After the piston 3 is retracted to the extreme right position, the rod cavity 15 of the power cylinder 1 is connected through a control distributor to a drainage reservoir. Control valve I2 switches and gas flows through channel 11, bore 10, channels 7, 8 and 6 in the rod

2c cavity 5 formed by pistons

3 and 4. Piston 4, moving left ,. displaces the working fluid from the rod cavity of the power cylinder 1 into the drainage tank. After reaching a predetermined gas pressure in the cavity between the pistons 3 and 4, which is controlled, for example, by a pressure switch (not shown), the valve 12 switches and connects the cavity between the pistons 3 and A with the atmosphere.

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The molten metal is poured into the pressing chamber, the working fluid under pressure is fed into the piston cavity 14 of the power cylinder 1 — the filling chamber of the pressing chamber is closed by the pressing piston. The cavity 14 is connected to the hydraulic accumulator, the mold cavity is filled with molten metal, the gas from the cavity 5 between the pistons 3 and 4 through the channels 6, 8 and 7 and the bore in the sleeve 9 is forced out into the atmosphere. The cavity 14 is connected to the multiplier and the metal is pressed into the mold. It is possible to work without a multiplier. The casting is crystallized, the mold is opened and the press residue with the casting is pushed out by a pressing piston mounted on the rod 2 from the pressing chamber.

The working fluid is supplied to the rod end of the cavity 15, the rod 2 with the piston 3 e and the pressing piston, as well as the piston 4 are moved to the extreme right position, since the cavity 14 through the control distributor is connected to the drain tank. The rod cavity 15 through the control valve is connected to the drain tank.

The device is prepared for repeat0

0

35

40

rhenium cycle.

The invention allows increasing the pressing speed, increasing the pressing force of the metal into the mold cavity, increasing the stability of the pressing conditions.

Claims (1)

Invention Formula A device for pressing in the metal of an injection molding machine, containing a pressing cylinder with a piston and a rod, a control system and pressure sources of gas and gas, characterized in that, in order to improve the quality of castings, it 50 is equipped with a floating piston located in the rod cavity of the pressing cylinder and a two-position distributor, wherein a cavity is made in the cylinder of the training, which is connected to one another through a two-position distributor with a source of gas pressure with rod end between pistons.