JP2819711B2 - Control method of supply of cold material to melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an aluminum-based metal ingot (hereinafter, referred to as an ingot).
Called cold material. The present invention relates to a method for controlling the supply of a cold material to a melting furnace suitable for use in the instantaneous melting apparatus of (1).

[Prior art] Melting of aluminum-based metal by die casting
When molding by casting as a member of electric equipment, etc., there is an instant melting device as a device that continuously and quickly melts a cold material, raises the temperature of a molten metal to an appropriate temperature, and taps the molten metal. Will be described with reference to FIG.

FIG. 2 shows the entire instantaneous melting apparatus. In this figure, reference numeral 1 denotes a cold material feeding guide serving as a guide for cold material feeding, and the cold material A ₁ sent from the cold material feeding device 2 is placed in an upright state. The molten metal is guided into the melting furnace 3 and is prevented from being scattered outside. The melting furnace 3 is composed of a furnace body 31 made of a refractory material and having an upright hollow cylindrical shape with a bottom and capable of storing therein a cold material in an upright state, and a furnace body 31 for heating and melting the cold material from its surface. It comprises an induction coil 32 provided on the outer periphery and an outlet 33 opened on the bottom wall of the furnace body 31. Reference numeral 4 denotes a heating furnace which is coaxially arranged below the melting furnace 3 and has a hollow cylindrical furnace body 41 made of a refractory material and having an upright bottom, and an outer periphery of a furnace body 41 for heating a molten metal 42 to an appropriate temperature. , And an outlet 44 opened in the bottom wall of the furnace body 41. Reference numeral 5 denotes a hollow tubular tapping pipe which extends downward from the outside around the outlet 44 and communicates with the heating furnace 4, and below which a tap 51 is provided. Reference numeral 6 denotes an outer periphery of the tapping pipe 5, which is an electromagnetic pump disposed above the tap 51, and discharges the molten metal 42 from the tap 51 so as to be adjustable.

Next, the operation of the entire instantaneous melting apparatus will be described.

Cold material A ₁ sent to the cold material chute guide 1 above the cold material feeder 2 is supplied to the cold material chute guide 1, the supplied cold material A ₂ is a furnace body 31 of the melting furnace 3 by its own weight The injected cold material A ₃ is heated by the action of the induction coil 32 and melted from its surface to become molten metal, which flows out of the outlet 33 into the heating furnace 4 and further passes through the outlet 44. And flows into the tapping pipe 5. Here, the electromagnetic pump 6 is adjusted to
The molten metal is pooled in the heating furnace 4 and kept at an appropriate temperature if the induction coil 43 is energized by keeping the 42 from flowing out of the tap 51. Then, the electromagnetic pump 6 is adjusted to discharge an appropriate amount of molten metal 42 from the tap hole 51 to a die casting machine (not shown) or the like.

Then, the supply control method of a cold material A in the conventional melting furnace 3, so that a new cold material A ₂ always to the cold material chute guide 1 as shown in FIG. 2 is waiting, the cold material A ₁ since controlled the time until the next supply Hiyazai a ₁ from the supply to the cold material chute guide 1, cold material a ₃ of the furnace body 31 of the melting furnace 3 is dissolved is low in height accordance become cold material a ₂ is descend into the furnace body 31 of the melting furnace 3, in the melting furnace 3 was always present Hiyazai a _3.

[Problems to be solved by the invention]

By the way, during the melting of the cold material A ₃ in the furnace body 31 of the melting furnace 3, the flow of the outlet 33 becomes poor, and the molten metal cannot flow out of the outlet 33, and may scatter in the furnace body 31. . At this time, since the front end portion of the cold material A ₂ waiting in the rear end portion and a cold material supply device 1 of the cold material A ₃ in the furnace body 31 is electrically disconnected, the vortex of the induction coil 32 no current flows to the cold material a ₂ waiting, since the cold material a ₂ is present in a cold state without being inductively heated, scattered molten metal talks stick to the cold material a _2, cold material there is a gap between the chute guide 1 and the cold material a ₂ is eliminated. And this means that the cold material A ₃ in the furnace body 31
Is be completely dissolved, cold material A ₂ had caused a problem that no longer come down to the furnace body 31.

The present invention has been made to solve this problem, and controls the supply of cold material to the melting furnace such that the scattered molten metal does not stick to the cold material waiting in the cold material input guide and hardens. The aim is to provide a method.

[Means for solving the problem]

In order to achieve the above object, a method for controlling the supply of a cold material to a melting furnace according to the present invention is a method for controlling the supply of a cold material to a melting furnace through a cold material charging guide, after the rear end of the cold material started to be melted by an induction coil. There is a method in which cold material is supplied to the cold material introduction guide.

Then, when the rear end of the cold material in the melting furnace comes to the surface including the vertical center circumferential line of the induction coil, the new cold material is supplied to the cold material charging guide. The front end portion of the cold material is effective because the optimum melting state can be obtained immediately after being put into the melting furnace.

[Operation] According to the method for controlling the supply of the cold material to the melting furnace of the present invention, a part of the cold material supplied to the cold material feeding guide is always fed to the position where the eddy current of the induction coil in the melting furnace flows. Therefore, the waiting cold material does not exist in the cold material charging guide in a cold state, and the scattered molten metal does not adhere to the waiting cold material and harden.

Embodiment Next, the present invention will be specifically described with reference to FIGS. 1 (a) and 1 (b). In these figures, those having the same symbols as those in FIG. 2 have the same constructions as those in FIG.

In order to carry out the method of the present invention, the following conditions must be satisfied in advance.

Keep the size of cold material supplied constant.

The power supplied to the induction coil 32 is made constant.

The supply interval at which the cooling material supply device 2 supplies the cooling material to the cooling material introduction guide 1 is changed.
Is set to the time required to reach the plane including the center line B in the vertical direction.

If the size of the cold material and the power supplied to the induction coil 32 are constant, the required time is always constant and can be easily calculated.

In a case where it is satisfied above conditions, as shown in FIG. 1 (b), induction rear end of the cold material A ₃ in the melting furnace 3 coils 32
Above the plane including the vertical center line (line B in the figure), no cold material is present in the cold material introduction guide 1. Then, the cold material A ₃ becomes gradually lower in height by being dissolved, eventually, B of the rear end portion of the vertical center circumferential line of the induction coil 32 (in FIG.
Line). At this time, since cooling material supply device 2 supplies a new cold material A ₁ in the cold material chute guide 1, the cold material is put into the melting furnace 3 by its own weight, as shown in FIG. 1 (b) in the vertical direction of the center circumferential line of the front end portion of the thrown-in cold material a ₂ induction coil 32 (B line in this figure)
Is immediately melted by the action of the induction coil 31. Therefore, the cold material does not exist in the cold material introduction guide 1 in a cold state, and the cold material is always present on the surface including the vertical center circumferential line B of the induction coil 32, which is the position where the melting efficiency is highest. exist, a front end portion of the newly thrown-in cold material a ₃ is optimal in solution is obtained.

[Effects of the Invention] As described above, the method for controlling the supply of the cold material to the melting furnace according to the present invention provides a method for cooling the next cold material after the rear end portion of the cold material charged into the melting furnace starts to melt. Since the material is supplied to the cold material input guide, the cold material does not exist in the cold material input guide in a cold state. Therefore, the molten material does not agglomerate in the cold material input guide and is supplied to the cold material input guide. The obtained cold material has an excellent advantage that it can be smoothly introduced into the melting furnace by its own weight.

Also, when the rear end portion of the cold material previously introduced into the melting furnace comes to the surface including the vertical center circumferential line of the induction coil, if new cold material is supplied to the cold material introduction guide, the new material is newly introduced. The front end of the cold material has an excellent advantage that an optimum melting state can be obtained immediately after being put into the melting furnace.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) show an embodiment of the present invention. FIG. 1 (a) is a vertical sectional side view when one cold material is present in a melting furnace. 2) is a vertical side view when two cold materials are present in the melting furnace, and FIG. 2 is a vertical side view of the instantaneous melting apparatus. 1 ... Cold material charging guide 2 ... Cold material supply device 3 ... Melting furnace 31 ... Furnace body 32 ... Induction coil 33 ... Outlets A ₁ , A ₂ , A ₃ ... Cold material

Claims (2)

(57) [Claims] A cold material introduction guide for guiding a cold material such as an aluminum ingot in an upright state, and a hollow cylindrical furnace body with a bottom capable of storing the cold material guided from the cold material introduction guide in an upright state. And an induction coil provided on the outer periphery of the furnace body for rapidly melting the cold material, and an outlet for opening the bottom wall of the furnace body and allowing the melt to flow out. A method for controlling the supply of cold material, wherein a new cold material is supplied to the cold material charging guide after a rear end portion of the cold material charged into the furnace via the cold material charging guide starts to be melted by the induction coil. A method for controlling the supply of cold material to a melting furnace, characterized in that the method comprises: 2. A cooling material is supplied to the cooling material introduction guide when a rear end of the cooling material in the furnace comes to a plane including a vertical center circumferential line of the induction coil. 2. The method for controlling the supply of cold material to a melting furnace according to 1.