SU923737A1 - Apparatus for forming liquid metal - Google Patents

Description

The invention relates to foundry and can be used in devices for stamping liquid metal.

Closest to the proposed of the known is a device for stamping liquid metal containing a pressing chamber, a mold installed therein and a pressing piston mounted on a movable plate and mounted coaxially with the pressing chamber [1}.

The drawbacks of the device are as follows; the device does not provide a constant volume closed by the pressing piston in the pressing chamber; the pressing piston acts directly on the casting, which causes the damping effect of the pressing piston to quickly form a crust in the contact zone and requires considerable effort to affect

2

solidified metal casting on the other side of the crust.

The purpose of the invention is to provide in the pressing chamber a constant volume closed by the pressing piston.

This goal is achieved by the fact that a device containing a pressing chamber, a mold with a pusher installed in it and a pressing piston mounted on a movable plate and mounted coaxially with the pressing chamber are provided with stops of equal length symmetrically located on both sides of the pressing piston and mounted on a movable plate, and the pressing piston is equipped with sealing rings. . '

FIG. 1 shows a device

general form; in fig. 2 - the same after

pouring liquid metal into the chamber

pressing; in fig. 3 * the same at the end of the pressing stroke; in fig. 4 3 923737 4

the same, at the time of ejection of the casting from the pressing chamber.

The device for stamping liquid metal contains a pressing chamber 1, a mold 2 installed therein with an ejector 3, a pressing piston 4 with sealing rings 5 "mounted coaxially with the pressing chamber 1 and mounted on a movable plate 6 with two stops 7 of lengths located symmetrically along both rtorons from the pressing piston 4.

The device works as follows.

After pouring the liquid metal 8 (metered portion) into the pressing chamber 1 with the mold 2, piston pressing is produced, resulting in a pressing piston

4 with sealing rings

5 enters the pressing chamber 1. The air or gas enclosed in the pressing chamber 1, due to the sealing rings 5, is compressed by the pressing piston 4, acting on the liquid metal 8 and forming a gas / air cushion 9 · The downward movement of the pressing piston 4 is limited by two stops 7 · After the liquid metal is solidified, the pressing piston 4 is retracted upwards , the ejector 3 with the mold 2 produces the extrusion of the finished casting 10 from the pressing chamber 1. After removal of the casting 10 from the mold 2, the latter ones vmese ^x ejector 3 is lowered to the lower position. Setup is ready for recycle operation.

The magnitude of the gas pressure in the gas cushion 9 mainly depends on the degree of air (gas) compression, on the initial air (gas) temperature in the pressing chamber 1, and the temperature of the liquid metal poured into the pressing chamber.

In addition to heating the air (gas) due to its compression in the pressing chamber, it is heated by the liquid metal.

Since the stroke of the pressing piston is limited by stops, a constant closed piston pressing volume is provided in the pressing chamber, in which the liquid metal poured into the mold is under pressure from the gas cushion, and the pressing piston itself turns into a locking device at the end of the pressing stroke.

With a constant volume of air (gas) pressure in a closed volume

5 gas cushion increases in direct proportion to the absolute temperature. Thus, in the gas cushion there is an additional pressure due to the heating of the air.

Yu (gas) liquid metal, which is transmitted to the casting.

The gas cushion acts as an elastic diaphragm, deformable

15 following the liquid metal, which provides directional solidification of the casting and eliminating the formation of shrink holes in the casting body.

^{20 The} pressure is transmitted through the gas cushion evenly over the entire cross section of the casting during the solidification period, as a result of which it is not necessary to deform the solid or the ^25- th crust directly by the pressing piston.

The proposed device allows to reduce the rate of formation

Casting skin ³⁰ side of the pressing piston and _ζ promote directional solidification of the casting, to improve 'effectiveness piston impacts due to the lower thickness of the casting

35 peel pressure application point, to increase resistance of the pressing piston ', and adjust the pressure on the molten metal by varying the degree of compression of air (gas) into ⁴⁰ Single least pressing or by adjusting the air pressure (gas) or oboyh specified parameters.

⁴ 5

Claims (1)

Claim A device for stamping a liquid metal, comprising a pressing chamber, a mold installed therein 50 with a pusher and a pressing piston and mounted on a movable plate and mounted coaxially with a pressing chamber, characterized in that, in order to ensure a constant volume closed by the pressing piston in the pressing chamber, it is equipped with two stops of equal length located symmetr923737 It is normal on both sides of the pressing piston and mounted on the movable plate, and the pressing piston is provided with sealing rings.