JP6997738B2 - Circulating non-ferrous metal melting furnace and non-ferrous metal melting method - Google Patents

Description

The present invention relates to a circulating non-ferrous metal melting furnace and a non-ferrous metal melting method for melting a non-ferrous metal such as an aluminum alloy while circulating it for the purpose of using it for manufacturing various cast products such as die casting.

Conventionally, for melting non-ferrous metals such as aluminum alloys, a melting furnace using a radiant flame from a gas burner using fossil fuels such as petroleum has been mainly adopted. However, radiant flames from gas burners using fossil fuels have problems in terms of thermal efficiency and the environment, so improvement measures have been sought.

As a remedy for this, a non-ferrous metal melting furnace having a structure in which an electric heater is immersed in a molten metal is disclosed (see, for example, Patent Document 1).
As shown in FIG. 3, the non-ferrous metal melting furnace 50 described in Patent Document 1 is provided with a plurality of chambers including a melting chamber 51, a heating chamber 52, and a scavenging chamber 53, and the non-ferrous metal material charged into the melting chamber 50. Is melted by an electric heater 56 provided in the temperature rising chamber 52 to raise the temperature to a predetermined temperature, and is supplied from there to the hot water outlet chamber 55 via the sedation chamber 54. The molten metal circulates from the slag removal chamber 53 to the temperature rise chamber 52, but the slag removal chamber 53 is not provided with an electric heater.

Since the non-ferrous metal melting furnace 50 melts and heats the non-ferrous metal material using an electric heater, it has a great advantage in terms of thermal efficiency and environment as compared with the conventional melting furnace using a gas burner. be.

Japanese Unexamined Patent Publication No. 2010-96401

However, the present inventors are not satisfied with this situation and proceed with further research and development, and a circulating non-ferrous metal capable of more efficiently melting and raising the temperature of non-ferrous metal materials by a novel configuration that has not existed so far. We have developed a melting furnace and a method for melting non-ferrous metals.

Therefore, an object of the present invention is to provide a circulating non-ferrous metal melting furnace and a non-ferrous metal melting method capable of efficiently melting and raising the temperature of a non-ferrous metal material.

In order to achieve the above object, the circulating non-ferrous metal melting furnace (1) of the present invention is a circulating non-ferrous metal melting furnace for melting a non-ferrous metal material using an electric heater.
A first heating chamber (12) and the first heating chamber (12) are arranged side by side via an intermediate wall (15), and the first heating chamber (12) forms a circulation path for circulating molten metal. (Ii ) Input of the non-ferrous metal material provided between the temperature rise chamber (13), the first temperature rise chamber (12) and the second temperature rise chamber (13), and on the upstream side of the first temperature rise chamber (12). The first temperature riser chamber (12) communicates with the mouth (11), between the first temperature riser chamber (12) and the second temperature riser chamber (13), and on the downstream side of the first temperature riser chamber (12). A furnace body (10) having a hot water discharge chamber (14) capable of receiving a part of the molten metal heated to a predetermined temperature and taking out the molten metal.
A circulation pump (20) provided in the first heating chamber (12), the second heating chamber (13), or both of them to circulate the molten metal, and
A plurality of first electric heaters (30) provided in the first temperature rising chamber (12) to raise the temperature of the molten metal to a predetermined first temperature, and
A plurality of second electricity provided in the second heating chamber (13) and heated to the first temperature in the first heating chamber (12) to a second temperature exceeding the first temperature. Equipped with a heater (40),
The molten metal heated to the second temperature in the second temperature rising chamber (13) is circulated in the first temperature rising chamber (12), and the heat is transferred from the charging port (11) to the non-ferrous metal. It is characterized by giving it to the material.

Further, the circulating non-ferrous metal melting furnace (1) of the present invention is characterized in that the first temperature is set to 600 ° C. to 750 ° C. and the second temperature is set to 10 ° C. to 100 ° C. higher than the first temperature. ..

Further, the circulating non-ferrous metal melting furnace (1) of the present invention is characterized in that the non-ferrous metal material is aluminum or an aluminum alloy.

In the non-ferrous metal melting method of the present invention, a first heating chamber (12) provided with a plurality of first electric heaters (30) and a second heating chamber (13) provided with a plurality of second electric heaters (40) are provided. A circulation path for the molten metal is formed by arranging them side by side with an intermediate wall (15) sandwiched between them, and is located between the first heating chamber (12) and the second heating chamber (13) and in the first heating chamber (12). The non-ferrous metal material is provided by using a circulating non-ferrous metal melting furnace (1) in which a non-ferrous metal material inlet (11) is provided on the upstream side and the downstream side is communicated with a hot water outlet chamber (14) from which molten metal can be taken out. Is a method of dissolving
The non-ferrous metal material is charged from the charging port (11) to prepare a molten metal whose temperature has been raised to a predetermined first temperature in the first heating chamber (12).
A part of the molten metal that has been heated to the first temperature is received in the hot water discharge chamber (14).
The rest of the molten metal is received in the second heating chamber (13), heated to a second temperature exceeding the first temperature by the second electric heater (40), and then circulated to the first heating chamber (12). ,
It is characterized in that the heat of the molten metal circulated to the first temperature rising chamber (12) is applied to the non-ferrous metal material newly charged from the charging port (11).

Further, the non-ferrous metal melting method of the present invention is characterized in that the non-ferrous metal material is aluminum or an aluminum alloy.

Here, the symbols in parentheses indicate the corresponding elements or corresponding items described in the drawings and the embodiment for carrying out the invention described later.

According to the circulation type non-ferrous metal melting furnace of the present invention, the molten metal is circulated by the circulation pump in the circulation path formed by the first temperature riser chamber and the second temperature riser chamber, and the predetermined temperature is determined by the first electric heater in the first temperature riser chamber. A part of the molten metal that has been heated to (first temperature) is accepted in the hot water outlet chamber, and the molten metal from the first heating chamber is received by the second electric heater in the second heating chamber (second temperature). Since the temperature is raised to the temperature) and then circulated in the first temperature rising chamber, the non-ferrous metal material charged into the first temperature rising chamber from the charging port can be effectively melted and heated.

That is, the molten metal (which has a temperature higher than the first temperature) heated to the second temperature is used to melt the non-ferrous metal material charged into the first temperature raising chamber and raise the temperature to the first temperature. This non-ferrous metal material can be efficiently melted in a short time, and the temperature can be raised to a molten metal having a predetermined temperature.

Further, according to the circulating non-ferrous metal melting furnace of the present invention, the first temperature was set to 600 ° C to 750 ° C, and the second temperature was raised by 10 ° C to 100 ° C higher than the first temperature. The charged non-ferrous metal material can be melted and heated more efficiently.

Further, according to the circulating non-ferrous metal melting furnace of the present invention, since the non-ferrous metal material is aluminum or an aluminum alloy, various cast products using aluminum can be satisfactorily manufactured.

In the non-ferrous metal melting method of the present invention, a part of the molten metal heated to the first temperature in the first heating chamber is received in the hot water outlet chamber, and the rest of the molten metal is accepted in the second heating chamber to exceed the first temperature. After the temperature is raised to two temperatures, it is circulated to the first temperature riser chamber and the heat is given to the non-ferrous metal material newly input to the first temperature riser chamber, so that the non-ferrous metal is efficiently melted and heated in a shorter time. can do.

Further, in the non-ferrous metal melting method of the present invention, since the non-ferrous metal material is aluminum or an aluminum alloy, various cast products made of aluminum can be satisfactorily manufactured.

It is a schematic plan view which shows the embodiment of the circulation type non-ferrous metal melting furnace by this invention. It is a graph which shows the flow and the temperature change of the molten metal in the circulation type non-ferrous metal melting furnace shown in FIG. It is a schematic plan view which shows the circulation type non-ferrous metal melting furnace by a conventional example. It is a graph which shows the flow and the temperature change of the molten metal in the circulation type non-ferrous metal melting furnace by the conventional example.

The circulation type non-ferrous metal melting furnace 1 according to the embodiment of the present invention will be described with reference to FIG.

In the circulation type non-ferrous metal melting furnace 1 according to the present embodiment, while circulating the molten metal, an electric heater is immersed in the molten metal except for the upper end portion thereof, and the heat thereof is used to melt the non-ferrous metal material. It also has a furnace body 10, a circulation pump 20, a first electric heater 30, and a second electric heater 40.

The furnace body 10 has a substantially rectangular shape in a plane in which an outer shell is formed by a furnace wall 10a, and includes an input port 11 for a non-ferrous metal material, a first temperature rising chamber 12, a second temperature rising chamber 13, and a hot water outlet chamber 14. The planar shape of the furnace body 10 is not limited to the rectangular shape.

The input port 11 is provided on the upstream side of the circulation path (described later). The first temperature rising chamber 12 is provided so as to communicate with the charging port 11 and receives the non-ferrous metal material charged from the charging port 11.
The second temperature rise chamber 13 is arranged side by side in the first temperature rise chamber 12 via the intermediate wall 15, and forms a circulation path through which the molten metal circulates with the first temperature rise chamber 12.
The intermediate wall 15 forms a gap path 16 (first gap path 16a and second gap path 16b) between both ends thereof and the furnace wall 10a facing each other.
Therefore, the circulation path is formed in the order of the first temperature rising chamber 12, the second temperature rising chamber 13, the first gap path 16a, and the second gap path 16b from the upstream side (input port 11).

The hot water outlet chamber 14 is provided between the first temperature riser chamber 12 and the second temperature riser chamber 13, communicates with the downstream side of the first temperature riser chamber 12, and has a predetermined temperature (first temperature) in the first temperature riser chamber 12. ) Accepts a part of the molten metal that has been heated up to. A partition wall 17 is provided between the first temperature riser chamber 12 and the hot water outlet chamber 14, a communication passage 17a is formed in the partition wall 17, and the first temperature riser chamber 12 is communicated with the second temperature riser chamber 13. The hot water discharge chamber 14 is provided with a mechanism (not shown) for taking out the received molten metal to the outside.

The circulation pump 20 is provided on the downstream side of the second temperature rise chamber 13 and circulates the molten metal along the circulation path. The location and number of circulation pumps 20 are not limited. Therefore, it can be provided in the first heating chamber 12, and can also be provided in both the first heating chamber 12 and the second heating chamber 13.

The first electric heater 30 is provided in the first temperature rising chamber 12 and raises the temperature of the molten metal to a predetermined first temperature. A total of 10 first electric heaters 30 are provided in the present embodiment, but the number is not limited.
The second electric heater 40 is provided in the second heating chamber 13, and the molten metal heated to the first temperature in the first heating chamber 12 is heated to a second temperature exceeding the first temperature. A total of 10 second electric heaters 40 in the present embodiment are also provided, but the number is not limited.

The non-ferrous metal in this embodiment is an aluminum alloy. Further, the first temperature is set to 700 ° C. to 720 ° C., which is suitable for casting a cast product, from the molten aluminum alloy. Further, the second temperature is set to 800 ° C., and the heat of the molten metal, which is about 100 ° C. higher than the first temperature, is used to efficiently melt and raise the temperature of the non-ferrous metal charged from the charging port 11 in a short time. Is set to.
The first temperature and the second temperature can be changed depending on the type of non-ferrous metal that melts and raises the temperature.

The operation of the circulation type non-ferrous metal melting furnace 1 according to the present embodiment will be described with reference to FIGS. 1 and 2 as a non-ferrous metal melting method according to the present embodiment. As described above, FIG. 1 is a schematic plan view of the circulating non-ferrous metal melting furnace 1 according to the present embodiment, and FIG. 2 is a graph showing the flow and temperature change of the molten metal in the circulating non-ferrous metal melting furnace 1.

First, the non-ferrous metal material (solid material) is charged into the upstream side (upstream side region A) of the first temperature rising chamber 12 through the charging port 11 (the temperature of the molten metal in the upstream side region A is shown by A in FIG. 2).
The non-ferrous metal material charged into the upstream region A flows through the first temperature riser chamber 12 along the circulation path, and the heat of the first electric heater 30 and the second temperature circulated from the second temperature riser chamber 13, which will be described later. The temperature of the molten metal in the downstream region B is increased to the first temperature by the time it reaches the downstream side (downstream region B) of the first heating chamber 12 (the temperature of the molten metal in the downstream region B is shown in FIG. 2B). show).

Here, since the molten metal circulated from the second heating chamber 13 to the first heating chamber 12 has a second temperature that is up to about 100 ° C. higher than the first temperature, the non-ferrous metal material charged into the upstream region A. Also receives that heat. Therefore, it is possible to melt and raise the temperature to the first temperature in a shorter time and more efficiently than in the case of melting and raising the temperature only with the first electric heater 30.

A part of the molten metal that has been heated to the first temperature in the first temperature rising chamber 12 is sent to the hot water outlet chamber 14 through the communication passage 17a formed in the partition wall 17, and then used as a manufacturing material for a casting product. Will be done. It should be noted that the first heating chamber 12 can be sent to the hot water outlet chamber 14 via, for example, a tunnel-shaped or concave communication passage 17a formed in the partition wall 17.

The remaining molten metal that was not sent to the hot water outlet chamber 14 is circulated to the second temperature rise chamber 13, where it is heated by the second electric heater 40 and reaches the second temperature by the time it reaches the downstream region C of the second temperature rise chamber 13. The temperature is raised (the temperature of the molten metal in the downstream region C is shown by C in FIG. 2).
As described above, the molten metal whose temperature has been raised to the second temperature circulates in the first temperature raising chamber 12 and is used for melting and raising the temperature of the non-ferrous metal material charged from the charging port 11. By continuously repeating these steps, the newly introduced non-ferrous metal material can be efficiently melted and heated in a short time.

Incidentally, in the conventional circulation type non-ferrous metal melting furnace 50 shown in FIG. 3, the molten metal is sent from the slag removal chamber 53 to the upstream region A'of the heating chamber 52 (upstream region A'). The temperature of the molten metal is shown by A'in FIG. 4), and the slag removal chamber 53 is not provided with an electric heater.
Therefore, the molten metal is heated to a predetermined temperature (for example, 700 ° C. to 720 ° C.) by the time it reaches the downstream side region B'of the temperature rising chamber 52 (downstream side region) only by the heat of the electric heater 56 provided in the temperature rising chamber 52. The temperature of the molten metal of B'is shown by B'in FIG. 4), and then sent to the sedation room 54 and the hot water outlet room 55.

In this respect, in the circulation type non-ferrous metal melting furnace 1 and the non-ferrous metal melting method according to the embodiment of the present invention, the first temperature sent to the hot water discharge chamber 14 by using the second electric heater 40 in the second temperature rising chamber 13. Since the molten metal heated to a higher second temperature is circulated in the first heating chamber 12, efficient melting and temperature raising can be performed in an extremely short time.

Further, since the temperature of the molten metal is raised in both the first heating chamber 12 and the second heating chamber 13, not only the circulating molten metal but also the entire furnace body 10 (furnace wall 10a) is maintained at a high temperature suitable for heating. This also makes it possible to efficiently raise the temperature in a shorter time.
Along with this, the load on the first electric heater 30 and the second electric heater 40 can be reduced.

In the above embodiment of the present invention, the aluminum alloy is targeted for melting and raising the temperature, but aluminum or other non-iron alloys can also be targeted. Further, the first temperature and the second temperature can be appropriately changed depending on the target non-ferrous metal and the like.

Further, in the embodiment of the present invention, an example in which the first temperature is set to 700 ° C to 720 ° C and the second temperature is set to 800 ° C is shown, but the first temperature is set to 600 ° C to 750 ° C and the second temperature is set. May be 10 ° C to 100 ° C higher than the first temperature.

1 Circulating non-ferrous metal melting furnace 10 Furnace body 10a Greenhouse 11 Input port 12 First temperature rise chamber 13 Second temperature rise chamber 14 Hot water outlet room 15 Intermediate wall 16 Gap road 16a First gap road 16b Second gap road 17 Partition wall 17a Continuous passage 20 Circulation pump 30 1st electric heater 40 2nd electric heater 50 Circulation type non-ferrous metal melting furnace 51 Melting room 52 Heating room 53 Cleaning room 54 Quiet room 55 Hot water discharge room 56 Electric heater A Upstream area of 1st heating room B No. (1) Downstream region of the heating chamber C Downstream region of the second heating chamber A'Upstream region of the heating chamber B'Downstream region of the heating chamber

Claims (5)

It is a circulation type non-ferrous metal melting furnace that melts non-ferrous metal materials using an electric heater.
The first temperature riser chamber, the second temperature riser chamber which is juxtaposed with the first temperature riser chamber via an intermediate wall and forms a circulation path in which the molten metal circulates in the first temperature riser chamber, the first temperature riser chamber and the above. Between the second temperature rise chamber and the inlet for the non-ferrous metal material provided on the upstream side of the first temperature rise chamber, and between the first temperature rise chamber and the second temperature rise chamber and in the first temperature rise chamber. A furnace body having a hot water discharge chamber that communicates with the downstream side and receives a part of the molten metal that has been heated to a predetermined temperature in the first heating chamber and can take out the molten metal.
A circulation pump provided in the first temperature riser chamber, the second temperature riser chamber, or both to circulate the molten metal,
A plurality of first electric heaters provided in the first heating chamber to raise the temperature of the molten metal to a predetermined first temperature, and
A plurality of second electric heaters provided in the second heating chamber and heated to the first temperature in the first heating chamber to a second temperature exceeding the first temperature are provided.
The molten metal heated to the second temperature in the second temperature rising chamber is circulated in the first temperature rising chamber, and the heat is applied to the non-ferrous metal material charged from the charging port. Circulation type non-ferrous metal melting furnace. The circulating non-ferrous metal melting furnace according to claim 1, wherein the first temperature is 600 ° C. to 750 ° C., and the second temperature is 10 ° C. to 100 ° C. higher than the first temperature. The circulating non-ferrous metal melting furnace according to claim 1 or 2, wherein the non-ferrous metal material is aluminum or an aluminum alloy. A first temperature rise chamber provided with a plurality of first electric heaters and a second temperature rise chamber provided with a plurality of second electric heaters are arranged side by side with an intermediate wall interposed therebetween to form a circulation path for molten metal. A circulating non-ferrous metal melting furnace in which a non-ferrous metal material input port is provided between the greenhouse and the second heating chamber and on the upstream side of the first heating chamber, and the downstream side is communicated with a hot water discharge chamber from which molten metal can be taken out. Is a method of melting the non-ferrous metal material using
The non-ferrous metal material is charged from the charging port to prepare a molten metal whose temperature has been raised to a predetermined first temperature in the first temperature rising chamber.
A part of the molten metal that has been heated to the first temperature is received in the hot water outlet chamber.
The rest of the molten metal is received in the second heating chamber, heated to a second temperature exceeding the first temperature by the second electric heater, and then circulated to the first heating chamber.
A method for melting a non-ferrous metal, which comprises applying the heat of the molten metal circulated to the first temperature rising chamber to the non-ferrous metal material newly charged from the charging port. The non-ferrous metal melting method according to claim 4, wherein the non-ferrous metal material is aluminum or an aluminum alloy.

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