JP2005121278A - Induction heating melting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating melting furnace for adding a melting material stably with supply power in a melted state without reducing the supply power to an induction heating coil. <P>SOLUTION: In the induction heating melting furnace 10, having a melting crucible 20 and an induction coil 30 wound at the periphery of the melting crucible 20, a short-circuiting plate 40 having a hollow section 40a for transmitting a melting material 160 is mounted to a melting material addition port 22 in the melting crucible 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an induction heating melting furnace that melts a melting material by the principle of induction heating, and more particularly, an induction that can stably add a melting material to a molten metal without reducing power supply even during melting. The present invention relates to improvement of a heating and melting furnace.

  First, regarding a conventional induction heating melting furnace, a cold crucible induction heating melting furnace having a melting crucible divided into a plurality of segments will be described with reference to FIG.

FIG. 3 is a longitudinal side view showing the configuration of a conventional cold-crucible induction heating melting furnace disclosed in Patent Document 1. As shown in FIG.
A conventional induction heating melting furnace 100 includes, as a main structure, a container-shaped melting crucible 110 formed by arranging vertically-divided conductive segments 112 that are electrically insulated from each other in the circumferential direction, and this melting crucible. And an induction heating coil 120 disposed around the crucible 110.

  The melting crucible 110 is formed of pure copper having a large thermal conductivity and a cooling water channel (not shown) is formed inside the conductive segment 112 so as to be efficiently cooled by the cooling water. .

  A molten material that is a metal to be melted such as a lump or powder is put into a melting crucible 110, and then AC power is supplied to the induction heating coil 120, whereby the molten material in the melting crucible 110 is induction-heated and melted by an alternating magnetic field. .

  In the molten state, as shown in FIG. 3, the molten metal 130 is formed in a raised dome shape, and the melting crucible 110 is cooled with cooling water, so that the melting crucible 110 has an inner bottom portion and a melting crucible 110 inner wall bottom side. A molten metal solidified body (skull) 140 is formed.

JP 2002-62054 A

By the way, in the conventional induction heating melting furnace mentioned above, the alloy of arbitrary compositions may be melted other than the case where a single metal is melted and cast.
At this time, an additive for making an alloy may be charged in the melting crucible before starting melting or may be added during melting.

  Further, when the additive is in a small amount, an addition operation is performed during melting in order to avoid a small amount of additive being taken into the skull and changing the composition of the alloy during skull formation at the initial stage of melting.

A problem that occurs when an additive is added after the start of melting will be described with reference to FIGS.
4 and 5 are side views for explaining the problems of the conventional induction heating melting furnace.

  As shown in FIG. 4, when the additive 160, which is a melting material, is introduced from the shooter 150 during melting, the additive 160 scatters due to the influence of the magnetic field from the induction heating coil 120. As shown, the melting power is lowered to prevent the additive 160 from being scattered by electromagnetic force.

However, lowering the power supplied to the induction heating coil 120 causes a new problem that the skull 140 increases or solidifies as shown in FIG.
Usually, after completion of the addition operation, an operation of increasing the supplied power is performed to bring the molten state into a molten state again, and the original molten state is obtained. However, in some cases, the increased skull 140 may be left as it is.

  This invention solves the said subject (problem), and provides the induction heating melting furnace which can add a melting material stably with the supply power of a molten state, without lowering the supply power to an induction heating coil. Objective.

  In the induction heating melting furnace according to the first aspect of the present invention, in the induction heating melting furnace including a melting crucible and an induction coil wound around the melting crucible, the melting material addition of the melting crucible The mouth is structured to shield the magnetic field from the induction coil.

  The induction heating melting furnace according to claim 2, comprising a melting crucible divided into a plurality of segments, an induction coil wound around the melting crucible, and adding a melting material from above the melting crucible In the induction heating melting furnace, the melting material addition port above the melting crucible is structured to shield the magnetic field from the induction coil.

  The induction heating coil according to claim 3 has a structure in which a magnetic field at the melting material addition port of the melting crucible is shielded, and a short-circuit portion is provided at the melting material addition port, or a melting material is added to the melting material addition port. A short-circuit ring or a short-circuit plate having a transparent hollow portion was attached.

Since the induction heating melting furnace of the present invention is configured as described above, it has the following excellent effects.
(1) Since it can shield the magnetic field from an induction coil if comprised as described in Claim 1, it can melt | dissolve a melted material stably with the supply power of a molten state, without reducing the supply power to an induction heating coil. Can be added.

(2) Since the magnetic field from the induction coil can be shielded when configured as described in claim 2, the magnetic flux density above the melting crucible can be reduced, and the molten state can be reduced without lowering the power supplied to the induction heating coil. The dissolved material can be added stably with the supplied power.

(3) With the configuration as described in claim 3, the magnetic field from the induction coil can be shielded with a simple structure, and the molten power can be stably supplied without lowering the power supplied to the induction heating coil. Dissolved material can be added.

An embodiment of the induction heating melting furnace of the present invention will be described with reference to FIG.
FIG. 1 (a) is a schematic side view showing an embodiment of the induction heating melting furnace of the present invention, and FIG. 1 (b) is a perspective view showing the shape of a short-circuit plate used in this embodiment. .

  As shown in FIG. 1 (a), an induction heating melting furnace 10 of the present embodiment is similar to the conventional induction heating melting furnace 100 shown in FIG. And an induction heating coil 30 disposed around the melting crucible 20.

  On the other hand, the induction heating melting furnace 10 of the present embodiment shields the magnetic field from the induction heating coil 30 shown in FIG. 1B at the upper opening of the melting furnace crucible 20 which is the melting material addition port 22. An electromagnetic short-circuit ring or short-circuit plate (shown is a short-circuit plate) 40 provided with a hollow portion 40a that transmits the material is attached.

  With this configuration, as shown in FIG. 1, even if the melting material 160 is added from the shooter 150 during melting in the induction heating melting furnace 10, the magnetic field from the induction heating coil 30 is near the melting material addition port 22. Is shielded or greatly attenuated, and the influence of electromagnetic force is almost eliminated, so that the melting material 160 is not scattered and the material can be stably added to the melting crucible 20 without lowering the power supply. It becomes like this.

  As a modification of the present embodiment, as shown in FIG. 2, a short-circuit portion 50 that shields the magnetic field from the induction heating coil 30 is provided at the upper opening of the melting furnace body that is the melting material addition port 22. Even if it provides, the same effect is acquired.

FIG. 4A is a schematic side view showing an embodiment of the induction heating melting furnace of the present invention, and FIG. 4B is a perspective view showing the shape of a short-circuit plate used in the present embodiment. . It is a schematic structure side view which shows other embodiment of the induction heating melting furnace of this invention. It is a vertical side view which shows the structure of the conventional cold crucible induction heating melting furnace. It is a side view for demonstrating the problem of the conventional induction heating melting furnace. It is a side view for demonstrating the problem of the conventional induction heating melting furnace.

Explanation of symbols

10: induction heating melting furnace 20: melting crucible 22: melting material addition port 30: induction coil 40a: hollow part 40: short-circuit plate 50: short-circuit part

Claims (3)

In an induction heating melting furnace comprising a melting crucible and an induction coil wound around the melting crucible,
An induction heating melting furnace characterized in that the melting material addition port of the melting crucible is structured to shield a magnetic field from the induction coil. In an induction heating melting furnace comprising a melting crucible divided into a plurality of segments and an induction coil wound around the melting crucible and adding a melting material from above the melting crucible,
An induction heating melting furnace characterized in that a melting material addition port above the melting crucible is structured to shield a magnetic field from the induction coil. As a structure that shields the magnetic field of the melting material addition port of the melting crucible, a short-circuit portion is provided in the melting material addition port, or a short-circuit ring having a hollow portion that transmits the dissolving material to the melting material addition port, or The induction heating melting furnace according to claim 1 or 2, wherein a short-circuit plate is attached.

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