JPH03199316A - Method for controlling supply of coolant to melting furnace - Google Patents

Abstract

PURPOSE:To prevent the generation of the lump of a molten metal in a coolant charging guide and to smooth charging by charging a fresh coolant after the coolant charged into a melting furnace begins to melt at the rear end part of the coolant at the time of supplying the coolants, such Al ingots, to an instantaneous melting device. CONSTITUTION:The coolant A1 sent to the position above the coolant charging guide 1 by a coolant supplying device 2 is supplied to the guide 1 and the supplied coolant A2 is charged by its own weight into the melting furnace 3. The charged coolant A3 is heated by the effect of an induction coil 32 to the molten metal which is allowed to flow out of an outflow port 33 to the heating up furnace. The fresh coolant is charged into the guide 1 after the rear end part of the supplied coolant A2 begins to melt. The existence of the coolant in the cold state in the guide 1 is obviated by this method and, the coolant A2 is smoothly charged by its own weight into the melting furnace without generating the lump of the molten metal.

Description

Detailed Description of the Invention "Industrial Application Field 1 This invention relates to a method for controlling the supply of cold material to a melting furnace suitable for use in an instant melting apparatus for aluminum-based metal ingots (hereinafter referred to as cold material)". Regarding the method.

"Traditional technology" When molding molten aluminum metal into parts for machines, electrical equipment, etc. by die-casting,
There is an instant melting device as a device that rapidly and continuously melts the cold material, raises the temperature of the molten metal to an appropriate temperature, and taps the molten metal.This instant melting device will be explained using FIG. 2.

Figure 2 shows the entire instant melting device, and in this figure, 1 is a cold material feeding guide that serves as a guide for feeding cold material, and the cold material A sent from the cold material supply device 1ff2 is held in an upright position. It guides the metal into the melting furnace 3 and prevents the molten metal melted in the melting furnace 3 from scattering outside. The melting furnace 3 includes a furnace body 31 that is made of a refractory material and has an upright hollow cylindrical shape with a bottom and can store cold material in an upright state, and a furnace body 31 that heats and melts the cold material from its surface. An induction coil 32 provided on the outer periphery,
It consists of an outlet 33 opened in the bottom wall of the furnace body 31.

Reference numeral 4 denotes a heating furnace disposed coaxially below the melting furnace 3, which includes an upright hollow cylindrical furnace body 41 with a bottom made of refractory material, and an outer periphery of the furnace body 41 that raises the temperature of the molten metal 42 inside to an appropriate temperature. It consists of an induction coil 43 provided in the furnace body 41 and an outlet 44 opened in the bottom wall of the furnace body 41. 5 is a hollow tubular tapping pipe that surrounds the outlet 44 from the outside, extends downward, and communicates with the heating furnace 4;
A tap hole 51 is provided below. Reference numeral 6 denotes an electromagnetic pump disposed on the outer periphery of the tap pipe 5 above the tap 51 to adjustably tap the molten metal 42 from the tap 5.

Next, the operation of the instant melting device as a whole will be explained.

The cold material A sent above the cypress material charging guide 1 by the cold material supply device 2 is supplied to the cypress material charging guide 1, and the supplied cold material A2 is charged into the furnace body 31 of the melting furnace 3 by its own weight. is,
The introduced cold material A is heated by the action of the induction coil 32 and melted from its surface to become molten metal. This molten metal flows out from the outlet 33 to the heating furnace 4, and further passes through the outlet 44 to be tapped. It flows into tube 5. Here, if the electromagnetic pump 6 is adjusted so that the molten metal 42 does not flow out from the tap outlet 51, and the induction coil 43 is energized, the molten metal will reach y? I,
7. It is pooled in the cage 4 and kept at the appropriate temperature. Then, adjust the electromagnetic pump 6 to pump an appropriate amount of molten metal 42
From S-yu 1151 to Guicast machine, etc. (not shown)
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In the method for controlling the supply of cold material A to the melting furnace 3 since +21, as shown in FIG. Since the time from supplying the cypress material to the cypress material input guide 1 until the next supply of the cold material A1 is controlled, the cold material A3 in the furnace body 31 of the melting furnace 3 is melted and its height is lowered. According to
, descended into the furnace body 31 of the melting furnace 3, and the cold material A3 was always present in the melting furnace 3.

[Problem to be Solved by the Invention] During the melting of the cold material A3 in the furnace body 3 of the melting furnace 3 on the P roller, the passage of the outlet 33 becomes difficult and the molten metal cannot flow out from the outlet 33. , may be scattered inside the furnace body 31. At this time, the rear end of the cold material A3 in the furnace body 31 and the cold material supply device? Since the front end of the cold material A2 on standby at I11 is electrically disconnected, the eddy current of the induction coil 32 does not flow into the cold material A2 on standby, and this cold material A2 is not heated by induction and is in a cold state. Therefore, the scattered molten metal would stick to this cold material A2 and harden, and the gap between the cypress material input guide 1 and this cold material A2 would sometimes disappear. and,
This means that the cold material A in the furnace body 31.

Even if the cold material A2 is completely melted, a problem arises in that the cold material A2 does not descend into the furnace body 31.

This invention was made to solve this problem.
To provide a method for controlling the supply of cold material to a melting furnace so that scattered molten metal does not stick to the cold material waiting in a cypress material feeding guide and harden.

"Means for Solving the Problems" In order to achieve the above object, a method for controlling the supply of cold material to a melting furnace according to the present invention provides a method for controlling the supply of cold material to a melting furnace through a cypress material feeding guide. 1. In this method, new cold material is supplied to the cypress material input guide after the part starts to melt by the induction coil.

Then, when the rear end of the cold material in the melting furnace comes to a plane including the vertical center circumference line of the induction coil, new cold material is supplied to the cypress material feeding guide. This is effective because the optimum melting state can be obtained at the front end of the cold material immediately after it is introduced into the melting furnace.

1 Effect 1 If the method for controlling the supply of cold material to the melting furnace of the present invention is used,
A portion of the cold material supplied to the cypress material feeding guide is always fed to the point where the eddy current of the induction coil in the melting furnace flows, so the cold material waiting in the cypress material feeding guide remains cold. The scattered molten metal will not stick to this waiting cold material and harden.

[Example 1] Next, this invention will be specifically explained based on FIGS. 1(a) and 1(b). Note that in these figures, the same symbols as those in FIG. 2 have the same configurations as those in FIG. 2.

To carry out the method of this invention, the following conditions should be satisfied in advance.

■Keep the size of the cypress wood supplied constant.

- Keep the power supplied to the induction coil 32 constant.

■Cold material supply system v! I2 supplies the cypress material to the cypress material input guide 1 at a feeding interval such that the cypress material is melted and its rear end is placed in the vertical direction of the induction coil 32. Set to the time required to reach the surface including the center circumference line H.

Note that, if the size of the cypress wood and the power supplied to the induction coil 32 are constant, the above-mentioned required time is always constant and can be easily calculated.

When the above conditions are satisfied, as shown in FIG. 1(a), the rear end of the cypress material A3 in the melting furnace 3
There is no cypress material in the cypress material input guide 1 when the cypress material input guide 1 is above the plane including the vertical center circumferential line of 2 (line B in this figure). As this cypress material A3 is melted, its height gradually decreases until its rear end reaches a point that includes the vertical center circumference line (line B in this figure) of the induction coil 32. At this time, the cold material supply device VI12 supplies new cypress material At to the cypress material input guide 1, so this cypress material is charged into the melting furnace 3 by its own weight,
As shown in Fig. 1 (portion), the front end of the inserted cypress wood A? reaches the surface including the vertical center circumference line (line B in this figure) of the induction coil 32, and immediately It is melted by the action of the induction coil 31.

Therefore, there is no cypress material in the cypress material input guide 1 in a cold state, and there is always cypress material in the area including the vertical center circumference line 8 of the induction coil 32, which is the position with the highest melting efficiency. exists, and the front end of the newly introduced cypress material A can be in an optimal melted state.

[Effects of the Invention] As explained above, the method for controlling the supply of cypress material to the melting furnace of the present invention is to control the supply of cypress material to the melting furnace after the rear end portion of the cypress material that was first introduced into the melting furnace begins to melt. Since the cypress material is supplied to the cypress material input guide, the cypress material is not present in a cold state in the cypress material input guide.Therefore, the molten metal does not solidify on the cypress material input guide, and the cypress material is fed into the cypress material input guide. The cypress material supplied to the guide has the excellent advantage of being able to be smoothly introduced into the melting furnace under its own weight.

Also, if you feed new cypress material to the cypress material input guide when the rear end of the cypress material that was previously introduced into the melting furnace comes to the surface that includes the vertical center circumference line of the induction coil, the new cypress material will be fed into the melting furnace. The front end of Japanese cypress wood has the excellent advantage of achieving optimal melting conditions immediately after being introduced into the melting furnace.

[Brief explanation of drawings]

Figures 1 (a) and 1(b) show an embodiment of the present invention; FIG. ) is a vertical side view when two cypress materials are present in the melting furnace, and Figure 2 is a vertical side view of the instant melting device. 1 ・ 2 ・ 3 ・ 31 ・ 32 ・ 3-A, t・Hinoki material input guide・・Cold material supply device・・Melting furnace・・Furnace body・・Induction coil・・Outlet A2, A3 ・・・Hinoki wood

Claims (1)

[Scope of Claims] 1. A cold material input guide that guides a cold material such as an aluminum ingot in an upright state, and a hollow cylindrical shape with a bottom that can store the cold material guided from this cold material input guide in an upright state. A melting device consisting of a furnace body, an induction coil provided around the outer periphery of the furnace body for rapidly melting the cold material, and an outlet opened in the bottom wall of the furnace body for flowing out the melted molten metal. A method for controlling the supply of cold material to a furnace, the method comprising: introducing new cold material into the furnace body after the rear end portion of the cold material introduced into the furnace body via the cold material introduction guide begins to melt due to the induction coil. A method of controlling the supply of cold material to a melting furnace, characterized in that the supply of cold material is supplied to a guide. 2. The new coolant is supplied to the coolant injection guide when the rear end of the coolant in the furnace comes to a plane including the vertical center circumference of the induction coil. A method for controlling the supply of cold material to a melting furnace.