JPH0536297U - Cross current melting device - Google Patents

Abstract

(57) [Summary] [Purpose] An electric current flows in the material to be melted in the cross direction or in the cross direction and the advancing direction, and the material is heated uniformly and continuously by its direct heat generation. [Constitution] In a facility for supplying a molten metal such as an aluminum alloy to a die casting die or the like, an induction coil for flowing an electric current to a material to be melted 8 having a relatively narrow cross section at right angles to its traveling direction is provided. The cross-sectional direction heating means 6 and the advancing direction heating means 7 for passing an electric current along the traveling direction of the material to be melted and having electrode terminals at both ends of the induction coil, and the material to be melted provided subsequent to the means. It comprises a cross-section heating means 16 for passing an electric current in a direction perpendicular to the above, and a molten metal accumulating means 4 provided subsequent to each of the above means and having an induction coil for passing an electric current in a horizontal direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cross current melting device for instantaneously supplying a molten metal of the alloy to be distributed to the die in the production of a die cast product made of an aluminum alloy or the like.

[0002]

[Prior Art]

 Conventionally, the production of die-cast products using aluminum alloy or the like has been carried out as follows. The first method is to install a holding furnace in the vicinity of the die casting machine, and to install a large master furnace or melting furnace away from the holding furnace, and to install a commercially available ingot and other return material in the master furnace. Was appropriately added to prepare a molten metal. The molten metal was distributed to the holding furnace, and then the molten metal was pressed into the cavity of the die of the die casting machine from the holding furnace. The second method is to install a relatively small melting furnace near the die-casting machine, and directly put commercially available ingots, billets and other return materials into the melting furnace to reduce the molten metal It is replenished and then this molten metal is supplied to the die.

[0003]

[Problems to be solved by the device]

 However, each of the above methods has the following problems. Since the former operates the holding furnace and the melting furnace separately from the die casting machine, this method is relatively easy to control the temperature of the molten metal, but requires a great deal of human power to distribute and pour the molten metal. And it needed a lot of space for its workshop location. On the other hand, the latter is good in that the work space is kept as small as possible, but it requires human power as in the former, and in addition, as described above, when reducing the molten metal, the billet at room temperature is directly charged into the small melting furnace. Therefore, the temperature of the molten metal drastically drops and fluctuates each time it is charged, and this work tends to be an intermittent operation, which requires complicated control to manufacture continuous and stable quality die-cast products. Since the melting furnace at a temperature higher than this was installed in the vicinity of the die casting machine instead of the holding furnace, the environmental temperature rose and the work efficiency dropped significantly.

In view of the above problems, the present invention can save space and provide a suitable working environment, and can supply molten metal having a constant temperature to a die of a die casting machine instantaneously with a small amount of manpower. A cross current melting apparatus is provided.

[0005]

[Means for Solving the Problems]

 The cross current melting apparatus of the present invention is a facility for supplying a molten metal such as an aluminum alloy to a die casting mold, etc. And a cross-section heating means having an induction coil for flowing a current, a cross-section heating means for passing a current along the direction of travel of the material to be melted and having electrode terminals at both ends of the induction coil, and a means provided subsequent to the means. It is characterized in that it is provided with a cross-sectional direction heating means for flowing an electric current in a direction perpendicular to the material to be melted, and a molten metal accumulating means which is provided subsequent to each of the means and has an induction coil for flowing an electric current in a horizontal direction. It is a thing.

[0006]

[Action]

 The material to be melted, such as an aluminum alloy, descends sequentially through the pull-down rolls and is first processed by the first cross-section heating means. This first cross-section heating means has a first induction coil. An alternating magnetic flux is formed by the current flowing therethrough, and a horizontal eddy current flows in the material to be melted, so that the material to be melted is heated relatively uniformly in the circumferential direction and the horizontal direction. On the other hand, at the same time, the material to be melted is also processed by the heating means in the traveling direction. That is, the material to be melted is in contact with the first electrode terminal provided above the first induction coil and the second electrode terminal provided below the first induction coil, and a voltage is applied between these first and second electrode terminals. As a result, a current flows through the material to be melted along the axial direction or the vertical direction, whereby the material to be melted is heated relatively uniformly in the above-mentioned direction. As a result of the above, an electric current flows through the material to be melted in the cross direction or in the cross direction, and the resistance heat generated directly causes the material to be heated almost uniformly.

Next, the second cross-section heating means is also induction-heated, and the material to be melted becomes a semi-molten state through the third cross-section heating means, which drops or flows into the molten metal accumulating means. The material to be melted is additionally heated and held and heated by the fourth sectional direction heating means provided in the molten metal accumulating means to become a molten metal having desirable workability. In this way, the molten metal supplied to the die of the die-casting machine can produce high-quality die-cast products with a constant temperature with high precision, and at the same time, its yield is high and its production speed is high, so it can be produced at low cost. Is possible. Since the melting furnace, which requires a large space to maintain a large amount of molten metal at an appropriate temperature, is not used, the working environment near the die casting machine is comfortable because it does not reach high temperatures, and its heating operation is the same as in the prior art. Moreover, since the process proceeds without a large amount of stagnation of part or all of the material to be melted, the use of energy is highly rationalized.

[0008]

【Example】

 An embodiment of the cross current melting apparatus of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic elevational sectional view showing an embodiment of the cross current melting apparatus of the present invention, and FIG. 2 is a block diagram showing an outline of an electric system of the cross current melting apparatus of the present invention. As shown in the drawing, a cross current melting apparatus 1 of the present invention comprises a cross current heating unit 2, an induction heating unit 3, a molten metal accumulating unit 4, a transmitter unit 5, and the like.

The cross current heating unit 2 has a first cross-section heating means 6 and a traveling direction heating means 7. The first cross-section heating means 6 is formed so as to surround the material 8 to be melted. It has an induction coil 9. A low-frequency or medium-frequency current, for example, is passed through the first induction coil, which causes an alternating magnetic flux to flow a horizontal current through the material to be melted 8 to make it relatively uniform in the horizontal direction. Be heated. A heat insulating layer 10, for example, is provided between the first induction coil 9 and the melted material 8, and the first induction coil 9 and the heat insulating layer 10 are fixed to the first support frame 11, for example. The traveling direction heating means 7 is provided with, for example, a first electrode terminal 12 provided above the first cross-section heating means 6 and a second electrode terminal 13 provided below the first electrode terminal 12, which are provided, for example, with a second support. It is attached to the frame 14. The first and second electrode terminals 12 and 13 are formed of, for example, carbon or metal brushes arranged and divided in the circumferential direction of the melted material 8. When electricity is applied between the first electrode terminal 12 and the first electrode terminal 13, uniform resistance heating is performed in the length direction of the melted material 8. A pull-down roll 15 is provided above the heating means 7 in the traveling direction, and the melted material 8 is sequentially fed downward continuously or intermittently by the rotation thereof. As a result of the above, a current flows in the melted material in the cross direction or the cross direction, and the resistance heat directly causes the current to be heated almost completely.

In the induction heating section 3, the second cross-section heating means 16 is provided with a second induction coil 17 and is provided with a heat insulating layer similar to the above, and an electric current flows through the second induction coil 17. As a result, an electric current flows horizontally in the material to be melted 8 to heat it, but preheating of the material to be melted 8 is further promoted at this stage. The third cross-section heating means 18 has a third induction coil 19, which is provided in the material injection section 20 above the molten metal accumulation means. By flowing an electric current through the third induction coil 19, the material to be melted 8 is resistance-heated, and at this stage, the material to be melted is in a semi-molten state, and is in a state of flowing downward or dropping from the surface side thereof. The material charging unit 20 is prepared from, for example, graphite.

The molten metal accumulating means 4 is provided below the material charging section 20. The molten metal accumulating means 4 is provided with a fourth cross-section heating means 21, that is, the crucible 22 of the molten metal accumulating means 4 is made of, for example, graphite, and the crucible 22 is provided with a heat insulator 23 through A 4-induction coil 24 is provided. For example, an aluminum alloy that has flowed down from the material charging section 20 enters the crucible 21 of the molten metal accumulating means 4. When a current flows through the fourth induction coil 24 in this manner, the material to be melted in a semi-molten state at the initial stage or during the final flow is finally additionally heated or held and heated by the fourth cross-section heating means 21 to obtain desired workability and The molten metal 25 has a temperature. The molten aluminum alloy 25 prepared as described above is sequentially taken out through the outlet 26 by another hot water distributing means (not shown) and injected into, for example, a die of a die casting machine.

The material to be melted, which is charged or transferred from the material charging section 20 to the crucible 22 of the molten metal accumulating means 4 is in relatively small amounts and is substantially continuous, so that the molten metal accumulating means 4 has a small capacity. However, the molten metal 25 having a constant temperature can be stably supplied. As shown in FIG. 2, the transmitter unit 5 is composed of an inverter 27, a matching unit 28, etc. The inverter 27 is a frequency converter that receives power from a commercial power supply 29 via a power switch 30, and for example, a low converter. Alternatively, the medium frequency or the like is selected. The matching unit 28 includes a matching transformer and a power factor improving capacitor.

Next, the operation of the cross current melting apparatus of the present invention will be described. First, when the power switch 30 is turned on, the first section direction heating means 6, the traveling direction heating means 7, the second section direction heating means 16, the third section direction heating means 18, and the fourth section direction heating means. An electric current flows through 21. On the other hand, the material to be melted, such as an aluminum alloy, is sequentially lowered by the pull-down rolls and is first processed by the first cross-section heating means 6, but a current is applied to the first induction coil 9 of the first cross-section heating means 6. By flowing, an alternating magnetic flux is formed, and a horizontal eddy current flows in the melted material 8 to uniformly heat the melted material 8 in its circumferential direction and horizontal direction.

At the same time, the melted material 8 is processed by the advancing direction heating means 7. A voltage is applied between the first and second electrode terminals 12 and 13, which causes a current to flow in the material to be melted 8 along its axial direction or in the vertical direction, whereby the material to be melted 8 is directed in the above direction. Is heated comparatively uniformly. As a result of the above, an electric current flows in the material to be melted in the cross direction or in the cross direction, and the resistance heat generated directly causes the material to be heated almost completely uniformly. Next, the material to be melted 8 is semi-molten by being heated by induction by the second cross-section heating means 16 and passing through the third cross-section heating means 18. The semi-molten material 8 to be melted drops or flows into the crucible 22 of the molten metal accumulating means 4. The material to be melted is additionally heated and held and heated by the fourth sectional direction heating means 21 provided in the molten metal accumulating means 4 to become a molten metal having desired workability.

[0015]

[Effect of the Invention] The cross current melting apparatus of the present invention is a facility for supplying a molten metal such as an aluminum alloy to a die casting die or the like, and the progress is made with respect to a material to be melted which is sequentially descended and has a relatively narrow cross section. A cross-sectional direction heating means having an induction coil for passing an electric current at right angles to the direction, and a traveling direction heating means for passing an electric current along the advancing direction of the material to be melted and having electrode terminals at both ends of the induction coil; And a cross-section heating means for supplying an electric current in a direction perpendicular to the material to be melted, and a melt storage means having an induction coil for supplying an electric current in a horizontal direction following the above-mentioned means. Therefore, the molten metal supplied to the die of the die-casting machine is highly precise and the temperature is constant, so that high-quality die-casting products can be manufactured, and at the same time, the yield is good and Since the production rate is high, it can be manufactured at low cost.

Since cross current heating is performed before the preheating and induction heating is performed after the preheating, remarkably excellent preheating operation can be performed. That is, in the preceding stage, there is little oxidative consumption due to the temperature of the electrode terminals and the temperature is relatively low, so the material to be melted also has a low electrical resistance and therefore can be heated with high efficiency. Since a large-scale melting furnace and holding furnace that require a large space and a high temperature are not used, and a relatively small capacity of molten metal storage means is used, the working environment in the vicinity of the die casting machine does not reach a relatively high temperature. It is quite comfortable, and its heating operation proceeds in sequence without going back or accumulating some or all of the objects to be heated as in the prior art, so that the use of energy is highly rationalized. It has a remarkable effect.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of a cross current melting device according to the present invention.

FIG. 2 is a block diagram showing an outline of an electric system of a cross current melting device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cross current melting device 2 Cross current heating part 3 Induction heating part 4 Molten metal storage means 5 Transmitter part 6 First cross-section direction heating means 7 Traveling direction heating means 8 Molten material 9 First induction coil 10 Heat insulation layer 11 First support Frame 12 1st electrode terminal 13 2nd electrode terminal 14 2nd support frame 15 Pulling down roll 16 2nd cross-section direction heating means 17 2nd induction coil 18 3rd cross-section direction heating means 19 3rd induction coil 20 Material input part 21 4th Sectional direction heating means 22 crucible 23 heat insulator 24 fourth induction coil 25 molten metal 26 discharge port 27 inverter 28 matching unit 29 commercial power source 30 power switch

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F27D 11/04 8825-4K 11/06 A 8825-4K

Claims (1)

[Scope of utility model registration request] 1. An induction coil in a facility for supplying a molten metal such as an aluminum alloy to a die casting die or the like, in which an electric current is applied to a material to be melted having a relatively narrow cross-section in a direction perpendicular to its traveling direction. A cross-sectional direction heating means having, a traveling direction heating means for passing an electric current along the traveling direction of the material to be melted and having electrode terminals at both ends of the induction coil, and a material to be melted provided following the means. A cross current melting apparatus comprising: a cross-section heating means for passing a current in a right angle direction; and a molten metal accumulating means provided after each of the means and having an induction coil for passing a current in a horizontal direction.