JP2853134B2 - Equipment for dissolving aluminum metal chips - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a melting device used for remelting cutting metal (commonly known as Dalai powder) of aluminum or aluminum alloy into molten metal.

More specifically, it is cut with a machine tool such as a lathe and is slender and thin, and it is in a state of being shrunk like permanent set hair, has a very large surface area per unit weight, and is easy to oxidize. The present invention relates to a melting apparatus for melting cutting chips called low aluminum or aluminum alloy chips ("shavings" in JISH 2119) with high melting efficiency to obtain high quality molten metal.

[Prior art] In order to remelt aluminum or aluminum alloy cuttings (commonly known as Dalai powder) into molten metal, a low-frequency induction melting furnace, a reflection type melting furnace, a reflection furnace using an electromagnetic gutter, and the like are used. ing.

Aluminum has a very small specific gravity of about 2.7, as is known as a representative of light metals.

In addition, except for brittle materials to be cut such as cast iron, general metal materials including aluminum have a certain degree of viscosity and toughness. It shrinks into an elongated and thin ribbon.

Aluminum has a low specific gravity of about 2.7 or less, has a low melting point of about 660 ° C., and has a strong bonding force with oxygen, so it is easily oxidized.

Therefore, aluminum-based metal chips called chippings or dust powder are supplied in a state of having a very large volume per unit weight and a large number of voids, and have all the bad conditions that they are easily oxidized.

The cutting surface of aluminum-diameter metal is covered with an oxide film even at room temperature, and it has undergone preliminary treatment such as degreasing and drying to separate cutting oil and other foreign matter adhering to the surface. Covered with membrane.

In order to dissolve such aluminum-based metal chips, it is necessary to put the chips in a molten metal, called the so-called hot water, which has already been formed in as short a time as possible to avoid contact with oxygen in the air and to make the molten metal. There is.

In addition, when the aluminum-based metal chips are charged into a melting furnace that has been heated to a high temperature, they burn and become ash, which significantly reduces the product yield.

Thus, thin chips are directly burned by oxidation, while somewhat thick chips are melted inside, but oxidation is prevented while the melted portion is prevented from flowing away by the presence of the outer skin of the oxide film. It is easy to result in a very small amount that proceeds and is collected as molten metal.

Thus, depending on the type of melting furnace, extremely difficult conditions are encountered to melt the aluminum-based metal chips, and special attention must be paid to melting in a reflective furnace in which a flame is directly blown by a burner.

Hereinafter, such melting points of various furnaces currently used will be briefly described.

(1) Crucible melting furnace The melting yield is good, but the electric energy is high because of the batch type and small capacity.

(2) Iron pan with stirrer Since it is small and small in volume, it requires human labor and the melting yield is low and fuel consumption is high.

(3) Rotor stirrer This is a type in which cutting chips are continuously fed from the upper part of the rotor.
The melting ability is limited and the wear of the ceramic rotor is large.

(4) Reverberatory furnace In a conventional reverberatory furnace, when chips are melted by a burner, the chips rapidly rise in temperature and burn, or when the surface is thickly covered with oxide, the surface melts even if the inside melts. Without dissolution, the dissolution loss due to oxidation increases.

For this reason, when feeding cutting chips, a batch method in which the burner is stopped, the cutting chips are put into the original molten metal that has already been melted, and mixed with a forklift or the like is repeated.

In a reverberatory furnace with an open well part, cutting chips are put into the open well part, and lightly bulky cutting chips are pushed into the molten metal in the open well part using an indentation plate from the top, but the melting yield is low and the Wear is fast.

(5) Melting furnace using a melt pump A melting furnace as shown in FIGS. 6 (A) and 6 (B) has been proposed and partially used in order to address the various problems described above. ing.

To describe the outline of this apparatus, a reverberatory furnace 60 is provided with a vortex chamber 63 below a chip conveyor 62 at a charging port 61, and a melt suction port 64 or a nozzle N is provided at a lower end of the vortex chamber 63, and a furnace body is provided. A melt pump 66 is disposed on the side 65 opposite to the loading port 61, and the melt pump 66 and the melt suction port 64 or the nozzle N are connected by a tunnel-like melt passage 67 extending substantially horizontally. .

When the molten metal is charged into the reverberatory furnace and the molten metal pump 66 is operated, the molten metal in the vortex chamber 63 is sucked and rapidly passes through the suction port, so that a vortex is generated above the molten metal.

Then, if chips are thrown into the vortex portion from the chip conveyor 62, the chips are swirled into the vortex, rapidly melted in the molten metal, sent from the discharge port of the molten metal pump 66 to the heating chamber, and then again vortexed. It flows and circulates in the chamber 63.

In this way, the problem of oxidative wear when dissolving aluminum chips is considerably solved.

[Problem to be Solved by the Invention] The problem that the above-described melt pump 66 and the reverberatory furnace having the vortex chamber prevent the abrasion of the aluminum-based metal due to the oxidization of the cutting chips and rapidly melt the aluminum-based metal can be achieved quite effectively. You.

However, in the above-described reverberatory furnace on the assumption that the molten metal pump 66 is used, in actual operation, roughly the following two types are used.
Two problems occur.

(1) Due to the necessity of using the molten metal pump 66, a tunnel-shaped molten metal passage arranged substantially horizontally and made fluid-tight is provided between the molten metal suction port 64 at the lower end of the vortex chamber 63 and the molten metal pump 66, In other words, they must be connected by the molten metal tunnel 67.

For the melt pump 66, it is necessary that the melt temperature is high (700 ° C or more) and that the depth of the melt at the pump insertion part is large (250mm or more). This condition must be satisfied before use. In addition, it is necessary to sufficiently preheat before use, and to sufficiently heat before use.

If the operation of the furnace is suddenly stopped for some reason, the molten metal in the furnace stays in the molten metal tunnel 67 at the bottom of the furnace. However, there is a disadvantage that it is easily solidified.

Once the molten metal has solidified in the molten metal tunnel 67, it must be melted by some means or removed mechanically before the next melting can be resumed. In addition, the man-hour for the removal is required and the cost is increased.

(2) Due to the structure of the molten metal pump 66, its operating part such as a blade comes into direct contact with a high-viscosity molten aluminum containing foreign matter such as dross.

The blades and other parts that are the operating part of the melt pump 66
Although it is made of ceramic material such as silicon nitride (SiN) and silicon carbide (SiC), which has considerably high corrosion resistance and wear resistance, the fact that the molten aluminum itself has corrosiveness,
Since it rotates at a considerable speed in contact with the molten metal, it is unavoidable that it will be worn out due to corrosion or erosion.These members are expensive, so the cost of the members themselves, the loss due to rest, and the cost increase due to the man-hours for replacing members Invite.

[Means for Solving the Problems] (1) In order to solve the above-mentioned problems caused by using the melt pump, the present invention employs an electromagnetic stirrer (also called a stirrer) instead of the melt pump. According to the premise of 1, the structure, arrangement, dimensional relationship with other members, and the like of the related members described below are rationally set to solve the above-described problems of the reverberatory furnace employing the molten metal pump. Not only that, but also for other issues, functions and effects that cannot be achieved by the melt pump are realized.

(2) Overall Structure of the Furnace In the following description, the direction from the chip entry of the reverberatory furnace to the opposite side is referred to as the longitudinal direction.
In FIG. 3 (A) and FIG. 3, a stirrer, a vortex chamber, and a passage for the molten metal whose temperature has been reduced by melting the cutting chips are arranged on the lower side.
The electromagnetic stirrer, the vortex chamber, and the path of the molten metal that melts the cutting chips and lowers the temperature are arranged on the opposite side of this longitudinal direction in the plan view, and in the lower side in FIGS. 1 (A) and 3, In FIG. 1 (A) and FIG. 3 on the opposite side of the longitudinal direction, the upper side is a melting chamber (heating chamber) in which the molten metal is heated by the burner B and heated.
As shown in FIG. 1, the two chambers are partitioned by a partition 16 which does not reach the ceiling of the furnace. As shown in FIG. 1 (B), the passage of the molten metal is inclined upward from the charging inlet side to the opposite side at a position between the vortex chamber and the stirrer.

This is to raise the level of the molten metal in the vortex generation chamber within an effective range, and is closely related to the structure of the next vortex chamber.

Further, the inner periphery of the furnace wall, particularly the corner portion of the vortex chamber, and the corner portion of the furnace wall corresponding to the end of the molten metal passage other than the vortex chamber,
It is built with a large radius so that the circumference is large in cross section.

(3) Vortex generation chamber (hereinafter abbreviated as vortex chamber) As the vortex chamber, in order to prevent wear of aluminum-based metal chips by oxidation, the chips are rapidly wound into the molten metal in the vortex chamber. In this way, the amount of the swarf that is oxidized by contact with the oxygen in the atmosphere is reduced as much as possible, and a structure that generates a vortex having a sufficient entanglement action to melt into the molten metal is provided.

To this end, the wall of the refractory material that defines the vortex chamber in a plan view is projected into the ridge 13a, and the cut-out tip 1a is formed.
A gap S is defined between the 3 'and the front wall 21 so that the molten metal in front passes through the gap S and flows into the vortex chamber, and the position of the axis of the suction port provided at the bottom is selected. The molten metal flowing into the vortex chamber was caused to flow along the inner periphery of the furnace wall.

The inner diameter of the entire vortex chamber was set to a range suitable for vortex generation, such as the inner diameter of the inlet of the suction nozzle at the bottom of the vortex chamber and the inner diameter of the discharge port of the suction nozzle of the vortex chamber.

(4) Provide a lid on the molten metal passage A lid 41 that covers the molten metal is provided above the molten metal passage where the electromagnetic stirrer is installed. As a result, all the thrust given to the molten metal by the electromagnetic stirrer is concentrated in the traveling direction of the molten metal,
The level of the molten liquid in the melting chamber is higher than the level of the molten liquid in the molten metal passage in the bottom surface of the lid, that is, the level of the molten metal, thereby promoting the generation of vortices in the vortex chamber.

(5) Provide an electromagnetic stirrer mainly at the lower part of the molten metal passage In addition to providing an electromagnetic stirrer below the molten metal passage, an electromagnetic stirrer is also provided above the molten metal passage. In this case, the member supporting the electromagnetic stirrer on the molten metal passage also functions as the lid described in (4) above, and the upper and lower stirrers and the lid cooperate to concentrate the thrust applied to the molten metal in the traveling direction of the molten metal. .

[Operation] By using an electromagnetic stirrer instead of the melt pump, the melt passage can be inclined upward in the flow direction of the melt, and first, the melt level can be raised by the height of the inclined surface.

By using the thrust of the electromagnetic stirrer, the level of the molten metal in the melting chamber is higher than the level of the molten metal in the molten metal passage. To increase the level of molten metal in the vortex chamber and increase vortex generation.

In addition, the thrust applied to the molten metal can be enhanced by covering the surface of the molten metal in the molten metal passage or installing an electromagnetic stirrer above the surface of the molten metal in the molten metal passage.

On the other hand, a jetty-shaped guide portion at the entrance of the vortex chamber causes the molten metal to flow from the open well portion to the outer periphery of the vortex chamber along the inner wall of the furnace. The dimensional ratio of the inner diameter of the entire vortex chamber, the inner diameter of the inlet of the suction nozzle at the bottom of the vortex chamber, the inner diameter of the discharge port of the suction nozzle of the vortex chamber, and the like are set to a range suitable for vortex generation. A swirl-type vortex is generated which is effective for swirling the aluminum cuttings by the co-operation with the above.

When the original hot water to be used initially is supplied to the melting apparatus of the present invention, an ingot or a large scrap is charged into the melting chamber 12 and melted using the burner B to obtain the hot water.
Alternatively, the molten metal may be generated in a separate melting furnace and supplied to the melting chamber 12, but such a method is rarely used.

In this way, when the amount of generated hot water increases, the hot water flows into the melting chamber 12, the open well section 14, the vortex generating chamber 13, the molten metal passage,
Distributed to 11. When the electromagnetic stirrer 15 is driven in this state, the molten metal flows into the molten metal passage 11 → the melting chamber 12 → the open well 14 →
It circulates from the vortex generation chamber 13 to the molten metal passage 11. In this case, the level of the molten metal in the open well portion 14 and the vortex generating chamber 13 increases until the amount of molten metal per unit time sent out by the electromagnetic stirrer 15 and the amount of molten metal per unit time passing through the nozzle N are balanced. In generating the vortex in the vortex generation chamber 13,
Although the molten metal surface immediately above the nozzle N has a mortar shape, there is no room for an air layer.

The aluminum-based metal chips (so-called aluminum chips) introduced into the vortex generation chamber 13 are caught in the generated vortex, and the surroundings are efficiently covered with molten metal, and are dissolved and oxidized without air coming into contact with the surface. Never.

The degree of oxidation when dissolving aluminum ingots and the like into the original hot water is negligible and negligible compared to dissolving aluminum-based metal cuttings by exposing the surroundings to air, and is considered as a target. Not in.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 (A) and 1 (B) are a plan view and a side view showing an embodiment in which the present invention is applied to an open well type reverberatory furnace.
In the drawing, reference numeral 10 denotes the entire furnace body, and reference numerals 11, 12, 13 and 14 denote a molten metal passage, a melting chamber, a vortex chamber, and an open well portion, respectively.

Reference numeral 15 indicated by a dashed line in the molten metal passage 11 is an electromagnetic stirrer, 16 is an intermediate partition partitioning between the molten metal passage 11 and the melting chamber 12, and rises upward from a furnace bottom wall 19 to a ceiling 17 of the furnace. Although it does not reach, it is slightly higher than the front wall 21 of the open well part. A gap is provided between the intermediate partition 16 and the rear wall 20 of the furnace, and serves as a passage 22 through which the molten metal flows from the molten metal passage 11 into the melting chamber 12.

16a is a partition wall that separates the lysis chamber 12 and the open well section 14 and is moved vertically up and down.
12 and the molten metal in the open well portion 14 communicate with each other.

As is apparent from FIG. 1B, which is a side view, the furnace bottom wall 19 has a slope 19 ′ inclined upward from the lower portion 19 a of the vortex chamber 13 toward the front 22 in the longitudinal direction of the furnace body 10. And 19 ″ is a horizontal transport path downstream of the slope 19 ′.

The molten metal given a thrust by the electromagnetic stirrer 15 rises along the slope 19 ′, flows along a horizontal flow path, and flows into the melting chamber 12.

The open well 14 and the melting chamber 12 are separated from each other by a lower end of a partition wall 16a that moves vertically up and down, with the upper part of the molten metal surface inside, and the molten metal in both parts communicates with each other.

The vortex chamber 13 is constructed so as to extend from an upper end on one side of the furnace wall (lower side in FIG. 1 (A)) surrounding the open well portion 14 and a position approximately halfway between the furnace walls to constitute a bath kettle. Intermediate bulkhead 16
The part corresponding to the extension of the vortex chamber 13 constitutes a part 13a of the wall surrounding the vortex chamber 13, and a part thereof is cut away to form a gap between the front wall 21 and the molten metal flowing from the open well part 14. Orifice S

The molten metal in the open well portion 14 flows from the gap between the notch tip 13 ′ and the front wall 21, that is, from the orifice S to the vortex chamber 13.
And passes through the axis of the suction nozzle N opened at the bottom of the vortex chamber in a plan view, extends on a line parallel to the front wall 21 or further to a position closer to the front wall 21 than that position, and flows in. The molten metal is guided to flow along the front wall 21.

Reference numeral B in the drawing denotes a burner using heavy oil or the like as a fuel, which raises the temperature of the molten metal in the melting chamber 12.

In the operation of the melting furnace, first, a necessary amount of hot water is charged into the furnace and the electromagnetic stirrer 15 is started.

After rising along the slope 19 ′, the molten metal flows into the melting chamber 12 from the passage 22 almost horizontally in the molten metal passage 11.

1A is an upper limit line of the molten metal level in the open well portion 14, b is a bottom line of the vortex chamber 13, and c is a molten metal storage tank below the vortex chamber 13. Is the bottom line.

In the code shown on the right side of FIG. 1 (B), e is the upper limit line of the level of the molten metal in the vortex chamber 13 and coincides with a, and f denotes the melting operation at the liquid level of the molten metal necessary for giving thrust to the molten metal. To be continuous, the melt must be kept at least to this level in the furnace.

Code g in the bottom surface of the horizontal portion of the downstream side of the molten metal passage 11 of the flow path than the slopes 19 'of the molten metal passage 11, head h ₁ between c and g is lifted by the electromagnetic stirrer, h ₂ electromagnetic stirrer 15 The level of the molten metal required to give a thrust, h ₃ indicates a level difference that can occur between the molten metal in the open well section 14 and the molten metal in the melting chamber 12, and within the range of this level difference, the open well section The level of the molten metal in 14, that is, the level of the molten metal in the vortex chamber 13 communicating with this at the upper portion is increased to promote the generation of vortices.

Next, the relationship between the shape and the internal dimensions of the vortex chamber 13 will be described with reference to FIGS.

The cut-out end 13 'of the intermediate partition 16 has already been described, and a description thereof will be omitted.

Assuming that the entire inner diameter of the tip 13 ′ is D ₁ , the inner diameter of the outlet of the suction nozzle is D ₂ , the diameter of the inlet of the suction nozzle is D _3, and the notch width of the orifice is S, the molten metal in the vortex chamber 13. In order for a swirl type vortex to be generated, it is desirable that the following relationship be established between these dimensions.

_{D 1 / D 2: 2~3 S} : D 1 / 2~D 1/4 D 3 / D 2: 1.5~1.0 Figure 3 is applied to the present invention the normal closed type reverberatory furnace without opening the well portion It is a plan view in the case where it is performed, and the description is omitted.

FIG. 4 is a front view taken along the line IV-IV in FIG. 3 or FIG. 1 (A), in which a lid 41 capable of moving up and down is arranged on the molten metal passage 11 and thrust by the electromagnetic stirrer 15 is applied to the molten metal. By directing only in the traveling direction, the level of the molten metal in the molten metal chamber 12, that is, the level e of the molten metal in the vortex chamber can be made higher than the bottom surface of the lid 41. It is particularly effective when doing so.

FIG. 5 shows that the level of the molten metal in the vortex chamber is further increased by applying a thrust to the molten metal in the molten metal passage 11 from above and below by mounting an electromagnetic stirrer 15 'also on the lid of FIG. Things.

[Effect] When the present invention is applied to a reverberatory furnace having an open well portion, a vortex chamber is provided at one corner of the open well portion, and in a normal reverberatory furnace, at one corner on the charging inlet side in the melting chamber. Properly select the inner diameter of the vortex chamber, the diameter of the molten metal discharge nozzle provided at the bottom of the vortex chamber, etc., and create an upwardly sloped portion from the vortex chamber to the opposite side from the bottom of the vortex chamber to the melting chamber. By communicating with the molten metal passage having, and by pressing the molten metal by the thrust of the stirrer provided on the lower side of the molten metal passage, or on both the upper and lower sides,
Raise the level of molten metal in the vortex chamber and increase the generation of vortices,
Aluminum cutting chips can be put into it to enable rapid melting.

In addition, since the molten metal passes through the molten metal passage having the inclined portion and is conveyed, even if the furnace is stopped, the occurrence of an accident such as the molten metal being stagnated in the molten metal passage and solidifying is eliminated, so that aluminum cutting chips can be removed. Conventional problems in dissolution are solved.

[Brief description of the drawings]

1 (A) and 1 (B) are a plan view and a side view showing a preferred embodiment of the present invention, and FIGS. 2 (A) and (B) are a plan view and a side view of a vortex generating chamber of the present invention. FIG. 3 is a plan view showing an embodiment in which the present invention is applied to a closed type reverberatory furnace, FIG. 4 is a front view showing an embodiment in which a lid is arranged on a molten metal supply path, and FIG. Front view of the embodiment arranged above and below the supply path,
6 (A) and 6 (B) are a side view and a plan view of a conventional reverberatory furnace using a molten metal pump. Reference numerals 10 and 10 'in the drawing: furnace body of reverberatory furnace, 11: molten metal passage, 11a: upper partition, 12: melting chamber, 13: vortex generation chamber, 13': notch tip, 13a:
Inner side wall, 14: open well, 15, 15 ': electromagnetic stirrer (stirrer), 16: intermediate partition, 16a: partition moving up and down, 17: furnace ceiling, 19, 19a: furnace wall, 19': slope , 1
9 ″: horizontal part, 20: rear wall of furnace, 21: front wall of furnace, 22: passage, 4
1: lid, a, b, c, e, f, g: liquid level, N: nozzle, R: radius of the corner of the furnace, S: between the front end of the notch of the middle partition wall and the front wall of the furnace Gap.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-44580 (JP, A) JP-A 64-22997 (JP, U) JP-B-62-27139 (JP, B2) (58) Field (Int.Cl. ⁶ , DB name) C22B 1/00-61/00 F27B 3/00-3/28

Claims (6)

(57) [Claims] 1. An open well portion (1) disposed on an upstream side.
4) and the molten metal supplied from the open well portion (14) is caused to flow through the gap (S) between the notched tip (13 ') of the intermediate partition (16) and the front wall (21). Vortex generation chamber (13) that melts while replenishing aluminum-based metal chips to the part
Receiving the aluminum-based metal chips from the nozzle (N) provided at the bottom of the vortex generation chamber (13), covering the periphery thereof with a molten metal efficiently and melting without contact with air. A horizontal bottom portion (19a) of the generation chamber (13), an inclined surface (19 ') following the bottom portion and inclined upward in the traveling direction of the molten metal, and a horizontal portion (19 ") downstream of the inclined surface (19'). ), And the temperature of the molten metal which is disposed continuously with the molten metal passage (11) and which has been lowered due to the melting of the aluminum-based metal cutting chips is heated by a burner (B) to increase the temperature. Melting chamber (1
2) and the lower end of a partition (16a) which is arranged in the middle of the melting chamber (12) and vertically moved up and down so as to allow communication between the melting chamber (12) and the melt in the open well (14). 16d), and a melting device (10) having an electromagnetic stirrer (15) disposed below a horizontal portion of the molten metal passage (11) downstream of the inclined surface (19 ′). In the state, the liquid level of the molten metal in the vortex generating chamber (13) is raised from the liquid level (f) of the molten metal in the molten metal passage (11) by the thrust given to the molten metal from the electromagnetic stirrer (15). The partition (16a) at the tip of the melting chamber (12)
At the lower end of the liquid level is raised to the upper limit (e),
The reduction in dissolution efficiency due to the amount of the aluminum-based metal chips oxidized outside of the furnace due to contact with oxygen increases the level of molten metal in the vortex chamber to an upper limit (e), thereby increasing the generation of vortices. An aluminum-based metal chip melting device characterized in that aluminum-based metal chips are entrained in the molten metal to prevent contact with an upper oxidizing atmosphere as much as possible. 2. A melting chamber (12) heated by a burner (B) arranged on the upstream side, and a chamber (13) for receiving molten metal supplied from the melting chamber (12).
d) and the molten metal in this chamber (13d) is caused to flow through the gap (S) between the notched tip (13 ') of the intermediate partition (16) and the front wall (21) to cut the aluminum-based metal. A vortex generation chamber (13e) that dissolves while supplying debris, and a nozzle (N) provided at a corner of the vortex generation chamber (13e)
After receiving the aluminum-based metal shavings entrained in the swarf, the molten metal efficiently covers the surroundings and is melted without contact with air, and is melted following the horizontal bottom (19a) of the vortex generating chamber (13e). Inclined surface (1
9 '), a melt passage (11) having a horizontal portion (19 ") downstream thereof, and a melting device (10') having an electromagnetic stirrer (15) disposed below the horizontal portion (19"). In a normal operation state, the liquid level of the molten metal in the vortex generating chamber (13e) is changed by the thrust given to the molten metal from the electromagnetic stirrer (15). From the position (f), and the molten metal in the molten metal passage (11) is moved by the electromagnetic stirrer (15).
At the junction of the melting chamber (12) and the vortex generation chamber (13d), the liquid level is raised to the upper limit (e), and the aluminum-based metal chips are removed from the outside of the furnace by oxygen. The lowering of the melting efficiency due to the amount oxidized by the contact with the whirlpool increases the level of the molten metal in the vortex chamber to the upper limit (e) to increase the generation of vortices, thereby causing aluminum-based metal chips to be entrained in the molten metal. An aluminum-based metal cutting chip melting device, wherein contact with an upper oxidizing atmosphere is prevented as much as possible. 3. A molten metal discharge nozzle (N) provided at the bottom of said vortex generating chamber (13, 13e) in the apparatus (10, 10 ') for melting aluminum-based metal chips according to claim 1 or 2. ) Has a diameter (D ₃ ) at the discharge end of the vortex generation chamber (13, 13).
e) It is smaller than 1/2 of the inner diameter (D ₁ ), smaller than the diameter (D ₃ ) of the inlet part of the discharge nozzle (N), and further has a molten metal inlet having a notch (13 ′). The width (S) between the notch (13 ') and the front wall (21) is equal to the vortex generation chamber (1).
3. An apparatus for melting aluminum-based metal chips, wherein the diameter is set to be not more than 1/2 of the inner diameter (D ₁ ) of 3, 13e). 4. The melting apparatus (10, 10 ') according to any one of claims 1 to 3, wherein the melting chamber (12) and the furnace wall corners of the other chambers have a large arc shape. An apparatus for melting aluminum-based metal cuttings, which is constructed with (R). 5. A melting apparatus according to claim 1, wherein said molten metal passage (1) is provided with a molten metal passage (1).
1) An apparatus for melting aluminum-based metal chips, wherein the upper surface (f) of the molten metal is covered with a lid (41) that can be raised and lowered. 6. A melting apparatus according to claim 1, wherein said molten metal passage is provided in said molten metal passage.
A separate electrode stirrer (1) is placed on top of the upper partition (11a).
5 ') is a melting device for aluminum-based metal cuttings, which is provided.