DE2304257B2 - Low pressure casting machine with electromagnetic submersible pump - Google Patents

Description

3 4

an electromagnetic submersible power line pump filling a single furnace at the same time

known design or an induction immersion specific number of shapes are carried out so that the

pump to use. Casting economy increased considerably

The invention relates to a method and, particularly in cases in which the liquid a Gießvorrich- 5 metal working under low pressure is very corrosive and with the known Vertung for liquid metals that drive a casting furnace and do not produce such a simple system a crucible in which the liquid metal is located.

as well as at least one feed line for the fluid

sigmetalls to the shape and at least one mechanical part of the examples and the drawing

cal centering system of the form in relation to the attributes.

management includes; the invention is thereby Fig. 1 shows schematically in section a plant

characterized in that the pressure change of the liquid with a tight crucible for pouring a metal,

metal in the supply line to the mold by being in contact with the air in a hot state

Change in the electrical supply voltage one in reacts strongly;

the crucible immersed electromagnetic 15 Fig.2 shows schematically in section a system, pump is achieved. at least part of the crucible with the environment. Thanks to the simple pressure control, the training air can be connected.
Supply pressure by simply changing the span In Fig. 1, the carrier of a crucible 2 is marked with the secondary winding of a transformer, in which up to level 3 liquid metal entangen, so that an automation of the casting is to keep ao. Liquid is possible via a supply device 4. , .ges metal passed into the mold 6, namely into the

Thanks to the wide pressure area associated with this space 5, which is closed by a cover 7.

Method is achieved, the pressure during casting. The feed device 4 can be perpendicular, as shown in FIG

without any risk to the strength of the crucible he is shown in the figure, or advantageously at an angle

be raised. Therefore, a printing cycle will be arranged in the crucible 35. In this case the

by simple automatic change of the chip shape not above the crucible 2, but in a

voltage attached to the secondary winding of a transfer- correct distance from this. As above

mator of a power line pump is applied, as indicated, it is possible to run several pumps at the same time.

that a high casting pressure is used. small crucible or in the same basin.

An open crucible can be used, 30 Two pumps are arranged so that their feed

without the pressure occurring in the crucible, guide devices diametrically opposed to each other.

changes. It can therefore, if necessary, gene in the crucible. An electromagnetic submersible pump 8 ent-

Refining products without further addition is taken by the liquid metal from the crucible 2 and conducted

will. By using an open crucible it can be transferred to room S.

is the installation of a ventilation system for cooling 35 In certain cases it is advantageous to use the crucible

the windings of the electromagnetic pump can be closed by a removable cover 9,

simple. Two cables are passed through this

In certain cases, especially when that leads. The ventilation line of the windings of the liquid metal in the presence of atmospheric oxygen very pump 10 and its seal 11 as well as the gas is active, the upper part of the crucible must be protected by a 40 pump line 12 are through the lid over a thick cover 9. Passed through the seal 13. The line arrives at pumps for the liquid metal contained in the crucible of a high-throughput forevacuum pump 14, the pressure in the liquid metal is reduced and, thanks to this arrangement, its degassing is very thorough. In other cases it is advantageous to clean the metal immediately before casting, to create a preliminary vacuum in the crucible, 45 achieved. With this for the first time used Vorum a more intensive degassing of the metal before the direction of the casting of aluminum are cast-casting, the advantage that the parts are made that no cracks or bubbles are heated metal in the liquid state and before .
Pour is cleaned thoroughly. By using the electromagnetic

In other cases, however, a large container is used

ter used whose one or more basins corresponds to the required value. To this

The ambient air. In this case, workpieces can be cast entirely

if the electromagnetic pump is not used whether the crucible is leak-proof or with the

housed heated part of the container. is connected to the training air, whereby the small-

On the other hand, it is very advantageous that the 55 most details are better formed than this

Feed system of the crucible with an electromechanical was previously possible. In this example

magnetic pump, the crucible as well as the following are the control cables

is arranged laterally above the feed basin. the electromagnetic, not shown in the figure

Due to this arrangement, several elec- pumps can be led to a central control panel that controls the

Magnetic pumps are provided over a basin. The form displays 60 pressure values. That way you can

and at the same time several forms are controlled by the pressure prevailing in the form at any one time.

ges supply basin are supplied. be regulated without the in the crucible above the

Due to this technical advantage, it is possible to change the pressure prevailing in the liquid metal level,

borrowed, one and the same casting furnace several feed F i g. 2 shows schematically in section a system,

basin, of which a part with the ambient air in which a part of the metal with the ambient air in

Ambient air is in communication and the one or touch is and the pouring of liquid has multiple electromagnetic pumps. Every aluminum thanks to the immediate formation of an aluminum

these pumps feed a mold. It can also be used with a nium oxide protective layer; these

remains as long as the furnace is not filled below a certain level.

This ensures that the printing cycle is automated when the liquid metal is fed in. At the end of this cycle, the pressure is at least twice as high as with conventional ones Procedure.

The basin 21 is extended by a part 22 which is in communication with the open air. The metal level is indicated by 23. This level can be kept constant between two specific values by periodically refilling the basin, namely the part protected from contact with the ambient air. The metal is fed via the inclined supply line 24 into the mold 26, the part 25 of which is filled with liquid metal. The cover of the mold 27 is removable. The electromagnetic pump is denoted by 28 and the cooling line of the pump winding 30 is denoted by 30. The knee-shaped outlet connection 31 of the pump is connected to the supply line 24 via a part 32; with the aid of a device 33 known per se, the mold can be detached from the feed system.
The system according to FIG. 1 or 2 is operated with an induction pump of known type; however, submersible power line pumps can also be used. The results obtained are extremely satisfactory.

Various changes are within the scope of the invention possible; in particular, a larger number of feed basins can be arranged around a furnace each basin with an electromagnetic pump, a supply system and

is equipped with a form. In the embodiment of FIG. 2, several basins 22, the are in communication with the Urogebungsluft, each provided with a pump 28, which with a Form 26 communicates.

1 sheet of drawings

Claims (8)

four parts, namely a sealed furnace, Jer a patent claims: contains crucible and withstands pressures of 1 to 1.5 bar, a system that is operated by air or a neutral 1. Low-pressure casting system with electromagnet! - Gas creates a pressure and the metal upwards shear submersible pump for very corrosive liquids 5 in the mold, a feed device that tals, such as aluminum, are equipped with a pressure under pressure to transfer the liquid metal from the crucible into the holder, which at least periodically conducts with a liquid arranged over the metal bath form and Sigmetall is supplied, consisting of at least one device, which consists of the actual shape and a shape which exists at a greater height than any mechanical device which the nigen of the container is arranged, an upward io shape on the feeder and leading supply line of the liquid metal evacuated into it as soon as it is filled with metal the form of at least one device for the preparation of such a system is known direction of the mold towards the liquid metal supply - casting under pressure in three phases. While line and at least one pump, which in a first phase is a pressure of about one The liquid metal located in the container is immersed, 15 0.5 bar on the liquid metal located in the sealed furnace marked that the sugar applied metal. The air or the neutral driving pressure of the liquid metal in the form (6; 26) gas that is in the above the liquid metal by changing the electrical supply voltage, it pushes into the supply path electromagnetic submersible pump (8; 28) and the metal fills the mold. While is regulated. In a second phase, the pressure in the furnace is increased 2. System according to claim 1, characterized thereby, a lower value is reduced, and it is shows that the supply pressure of the liquid metal gradually let the air out of the mold the mold (6; 26) presses according to a pressure cycle. Finally, during a third phase klus takes place, which is automatically regulated and supplied to gas under high pressure, so that the Meseinem At the end of a pressure of a high value and exposed to the highest possible operating pressure shows. wu-d, the one with the resilience of the crucible 3. System according to claim 1, characterized in that it is compatible. This pressure must not be 1 to 1.5 bar indicates that at least part (22) of the Bek- exceed. kens (21) periodically with a liquid metal. Since the metal does not rotate, it solidifies in the is provided and with the ambient air in Beruh- 30 for the provided device and can from the tion stands. Crucible are removed. 4. Installation according to claim 3, characterized in that such a structure and the characteristics required for this purpose, that at least one of the electromagnetic processes have certain disadvantages.
table submersible pumps (28) in the part of the Bek- The first disadvantage is that in one of the kens is housed, the air is in contact with the surrounding environment of the liquid metal level in the crucible. drops during filling, so that as a result of the 5. Plant according to claim 4, characterized in that the characteristic line is a gas under constant pressure draws that several electromagnetic submersible pumps are under decreasing pressure in the furnace (28) in each case a mold (26) with liquid is supplied to the molds of metal. This disadvantage supply metal and laterally in one and the same 40 is eliminated by having a furnace with two smoke Basins (21) are housed, little use is made of them separately is at least periodically supplied with liquid metal. are; however, their separation creates more 6. Plant according to claim 4, characterized marked difficulties. draws that several liquid metal feed plates Another disadvantage is that the flow (21), which in combination with the ambient air 45 absorbs the pressurized gas, standing, each with at least one electrode that generates the pressure on its surface. As a result Magnetic submersible pump (28) are equipped, of which occur slightly in the cast workpiece one form (26) is supplied in each case. gige gas inclusions, through which the resistance 7. Plant according to claim 1, in which the fluidity of the casting is reduced in an undesirable manner metal is in a crucible, thereby becoming 50. indicates that the crucible (2) at its top, on the other hand, the casting pressure cannot be increased Ren end is closed by a lid (9). without destroying the crucible. Through the 8. Plant according to claim 7, characterized by this pressure is at least partially the height draws that a vacuum pump (14), the dimensional accuracy of certain details of the cast Suction line (12) determined above the highest level (3) of the 55 part. Liquid metal ends, a constant degassing of the aim of the invention is to provide a system for indu- Metal ensures strial use in manufacturing the shape pressure has three phases, without the amount of remaining metal playing a significant role, 60 gas inclusions are completely excluded and in the finally the operating pressure can be increased to a higher value. The disadvantages mentioned are achieved by using an electromagnetic The subject of the invention is to see a low-pressure submersible pump eliminated in the furnace,
casting plant, in particular one in which an electromagnetic submersible pump is used. with which several forms are filled at the same time One currently used in the industry.
Low-pressure casting system consists essentially of another goal in this system