JPH035267B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide a pouring method and a casting apparatus therefor, which are particularly useful when casting thin, large-area plate-like long products such as curtain walls and reliefs. has.

Specifically, when pouring molten metal into a mold space formed by molding sand in a sand mold flask, a method is generally adopted in which the molten metal is poured into the sprue of the mold flask at normal pressure. However, this caused the following problems.

In other words, the fluidity of molten metal is determined not only by the mounting angle, shape, and gate design of the mold, but also by the thermal properties of the molten metal and mold (the amount of heat retained by the molten metal, superheating, latent heat of solidification, specific heat, and density, and the cooling capacity of the mold). As mentioned above, simply pouring molten metal at normal pressure will result in a short flow length, resulting in thinner and longer casting products. There were naturally limits to scale.

In addition, as a means to improve such problems, a method is known in which the molten metal is poured under pressure, but in this case, the flow rate of the molten metal at the sprue side becomes extremely high. As a result, severe turbulence in the mold space can easily cause troubles that can lead to defective products, such as dross being entrained inside the casting, gas inhalation, or deformation due to damage to the surface layer or surface oxide film. There is.

The feature of the pouring method for casting according to the first invention is that an electromagnetic induction device provided on the outer periphery of the mold flask for non-magnetic sand allows the sprue to flow into the mold space formed by the mold sand in the mold flask. Applying an electromagnetic force to the cast molten metal to force it to flow toward the deep part of the mold space, and apply an electromagnetic force to the forced flowing molten metal that has reached the deep part of the mold space or near it in the opposite direction to the above. The point is to apply an electromagnetic force to cast molten metal into the mold space.

The functions and effects of the above characteristic method are as follows.

While pouring molten metal into the sprue of the mold flask at normal pressure, the molten metal poured into the mold space is controlled at a predetermined flow rate using electromagnetic force generated by an electromagnetic induction device. The fluid can be forced to flow reliably and smoothly deep into the mold space. In addition, it is possible to apply a braking force to the forced flow molten metal that has reached the deep part of the mold space or near it by using electromagnetic force in the opposite direction to that described above, so that the forced flow molten metal reaches the deep part of the mold space or near it. It is possible to prevent deformation caused by impactful collision with sand.

Therefore, while using molding sand that has excellent moldability and is inexpensive as a mold material, the flow length of the molten metal can be increased as much as possible while avoiding problems that can lead to defective products such as deformation. It is possible to reliably handle thin, large-area, long plate-like products such as curtain walls.
Good casting was achieved.

The characteristic structure of the casting apparatus for casting according to the second invention is that the machine frame has a passageway through which a mold flask for non-magnetic sand can be freely inserted and removed; To provide electromagnetic force to force the molten metal poured from the sprue to flow toward the deep part of the mold space, and to apply braking force to the forced flowing molten metal that has reached the deep part of the mold space or near it. An electromagnetic induction device that generates an electromagnetic force, and a device that guides the insertion and removal movement of the mold flask are provided.

The effects of the above characteristic configuration are as follows.

For example, when assembling the electromagnetic induction device one by one on the outer periphery of the mold flask, it is only necessary to sequentially replace the mold flask filled with molds in a wide area outside the machine frame in the passage of the machine frame equipped with the electromagnetic induction device. The work efficiency is higher than that of the mold flask, and since the machine frame is provided with a device for guiding the insertion and removal movement of the mold flask, the work of replacing the mold flask can be done quickly and with less effort.

Therefore, it has been possible to provide an apparatus that can efficiently and easily carry out the method having excellent effects as described above.

Embodiments of the present invention will be described below based on the drawings.

To configure a casting device for casting, a mold flask 1 for non-magnetic sand is inserted into a machine frame 3 having a passage 2 that can be freely inserted and removed.
A first generator that generates an electromagnetic force for forcing the molten metal poured from the sprue 6 into the mold space 5 formed by the mold sand 4 in the mold flask 1 toward the inner part of the mold space 5. An electromagnetic induction device 7 comprising a mechanism 7A and a second mechanism 7B that generates an electromagnetic force for applying a braking force to the forced flow molten metal that has reached the deep part of the mold space 5 or the vicinity thereof, and the mold. A device 8 for guiding the insertion and removal movement of the frame 1 is provided.

The first mechanism 7A of the electromagnetic induction device 7 includes primary iron cores 9 and 10 arranged with a gap of a certain length between them on the upper and lower surfaces of the mold flask 1, and grooves 9a of the primary iron cores 9 and 10. Three-phase windings 11, 12 and frequency converter 1 provided in 10a
3, and the second mechanism 7
Similar to the first mechanism 7A, B includes the primary cores 9, 10 and the grooves 9a, 10 of the primary cores 9, 10.
It is composed of three-phase windings 14, 15 and a frequency converter 16 provided within a.

By using the molten metal cast into the mold space 5 as a secondary conductor, electromagnetic force generated between the primary and secondary cores in a direction parallel to the primary cores 9 and 10 is used to conduct the molten metal. mold space 5 at a predetermined flow rate.
At the same time, at or near the deep part of the mold space 5, a braking force is applied to the forced flowing molten metal to prevent the molten metal from shockingly colliding with the molding sand 4. .

Furthermore, by changing the frequency of the alternating current that is applied to the three-phase windings 11, 12 and 14, 15 by the frequency converters 13, 16, the forced flow speed and braking force of the molten metal can be freely controlled. be able to.

The movement guide device 8 includes a plurality of wheels 8a for rollingly guiding the mold flask 1 in a mounted state.
It consists of

Incidentally, the mold flask 1 may be placed inclined so that the sprue 6 side is located upward.

Further, in the above embodiment, the electromagnetic induction device 7 is provided over almost the entire mold space 5, but it may be provided only in a portion where the molten metal needs to be forced to flow.

[Brief explanation of the drawing]

The drawings show an embodiment of the casting method and the casting apparatus according to the present invention, and FIG. 1 is a longitudinal sectional front view;
FIG. 2 is an electrical circuit diagram. 1...Mold flask, 2...Passway, 3...Machine frame, 4...
...Molding sand, 5...Mold space, 6...Gate, 7...
Electromagnetic induction device, 8...Movement guide device, 13, 16
...Frequency converter.

Claims (1)

[Claims] 1. The molding sand 4 in the molding flask 1 is controlled by an electromagnetic induction device 7 provided on the outer periphery of the molding flask 1 for non-magnetic sand.
Electromagnetic force is applied to force the molten metal poured from the sprue 6 into the mold space 5 formed by the sprue to flow toward the deep part of the mold space 5, and the molten metal reaches the deep part of the mold space 5 or near it. A pouring method for casting, characterized in that the molten metal is poured into the mold space 5 by applying an electromagnetic force in the opposite direction to the above-mentioned forced flow molten metal. 2 Passage 2 through which the non-magnetic sand mold flask 1 can be freely inserted and removed
In order to forcefully flow the molten metal poured from the sprue 6 toward the inner part of the mold space 5 in the mold space 5 formed by the molding sand 4 in the mold flask 1, An electromagnetic induction device 7 that generates an electromagnetic force and an electromagnetic force for applying a braking force to the forced flow molten metal that has reached the deep part of the mold space 5 or the vicinity thereof, and an electromagnetic induction device 7 that controls the insertion and removal movement of the mold flask 1. A casting device for casting equipped with a guiding device 8. 3. The casting device according to claim 2, wherein the electromagnetic induction device 7 is equipped with means capable of changing the forced flow speed and braking force of the molten metal. 4 The changing means is a frequency converter 13, 16
A casting device for casting according to claim 3.