JPS617061A - Melting and casting system of metallic material - Google Patents

Abstract

PURPOSE:To reduce the charging time of a metallic material and to lessen the manpower for operation by heating and melting base metals in a cylindrical melting chamber, melting the same together with the remaining metallic materials into a molten metal in a main melting furnace and casting the molten metal to an ingot by a continuous casting device. CONSTITUTION:Bundles 28 consisting of the base metals 24 preheated in a preheating flue 8 are charged into the cylindrical melting chamber 4 and are heated and melted continuously by a combustion heater such as burner provided in the lower part of the chamber. The molten metal 42 formed therein is stored in a holding chamber 6. A prescribed amt. of the molten metal 42 is then fed through a feed spout 12 into a main melting furnace 10 and is made into the molten metal together with the remaining metallic materials 26. The molten metal is introduced through a feed spout 14 into the holding furnace 16 where the molten metal is subjected to treatments such as degassing and slag removal. The molten metal is then supplied vai a casting spout 18 into the continuous casting device 20, by which the ingot 22 is continuously formed. The material charging time and melting time are reduced by the above-mentioned operation and the oxidation loss is effectively suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for melting and casting metal materials, and in particular, melts a predetermined metal material including metal ingots and scraps to form a molten metal, and supplies the molten metal to a casting device. The present invention relates to a system for performing desired casting.

Conventionally, in order to obtain metal ingots such as aluminum or its alloys that are subjected to various processing such as rolling and extrusion, in addition to metal ingots, scraps such as rotating waste, and even intermediate alloys have been used as melting materials. After charging the metals into the melting furnace all at once and melting them, the resulting molten metal is led to a predetermined casting device to perform the desired casting. For this reason, it takes time and man-hours to charge the melted material (metallic material) into such a melting furnace, and especially in large melting furnaces, a side charge method is used in which the metal material to be melted is charged from the side. It is typically recognized in Further, in such a melting furnace, since increasing the melting rate promotes oxidation loss, the melting temperature is suppressed, which has the inherent problem that the melting time becomes longer.

Due to these circumstances, a melting furnace for melting metal materials, a holding system that accommodates and holds the molten metal formed in such a melting furnace, and supplies the molten metal to a casting device when necessary. In a large duplex furnace equipped with a furnace,
There were problems such as the melting cycle being longer than the holding furnace cycle, resulting in imbalance and poor equipment efficiency. Furthermore, in such a furnace, since the charging and melting processes are carried out in a hatched manner, the thermal efficiency is poor, and it is difficult to preheat the material with the combustion exhaust gas of the melting furnace.

The present invention has been made against the background of the above circumstances, and its purpose is to convert a predetermined metal material including metal ingots and scraps, particularly aluminum or its alloy material into a combustion method. When melting and casting metal materials in the melting furnace of It is an object of the present invention to provide a metal material melting/casting system that is matched with a holding furnace cycle to improve production capacity.

In order to achieve such an object, the present invention melts a predetermined metal material including the metal base metal and the scrap described above to form a molten metal, and supplies the molten metal to a casting device. In a melting/casting system that performs desired casting using a method, (a) a predetermined proportion of the metal ingot is charged into a cylindrical melting chamber, and a combustion heating device is provided at the bottom of the melting chamber. (b) a vertical melting means configured to continuously and gradually melt the metal base metal by heating; Contains molten metal,
(C) receiving a predetermined amount of the molten metal held in the first holding means, and removing the metal ingot melted by the vertical melting means; a main melting means for melting the remaining metal material; (d) a second holding means connected to the main melting means and containing and storing the molten metal guided therefrom; and (e) a second holding means. The casting device is configured to include a casting device that receives the molten metal guided from the means and casts a predetermined metal ingot from the molten metal.

In this way, in the present invention, a predetermined proportion of the base metal constituting the metal material to be melted is separately continuously and intensively preheated and melted, while the other materials are heated as before.
It is designed to be charged and melted in bulk by the main melting means, and by adding this central metal melting means, it is possible to automate the charging of metal materials in the relevant part, and the combustion exhaust gas during melting can be Preheating can be performed automatically, making it possible to melt continuously, and furthermore, when necessary, the obtained molten metal can be sent to the main melting means in a predetermined amount at the required time. As a result, the melting furnace as a whole can shorten charging time, save labor, improve overall thermal efficiency through preheating and continuous melting, and shorten the melting cycle to match the holding furnace cycle. This resulted in excellent effects such as improved production capacity.

) Hereinafter, the present invention will be explained in more detail with reference to the drawings.

First, FIG. 1 shows one system diagram according to the present invention, in which 2 is a continuous melting device,
A cylindrical melting chamber 4 as a vertical melting means, and this melting chamber 4
a holding chamber 6 as a first holding means connected to the lower part of the melting chamber 4; and a horizontal preheating flue 8 provided at the upper part of the melting chamber 4.
It has Further, 10 is a main melting furnace as a main melting means equipped with a combustion heating device such as a burner, and the metal/8 hot water obtained by melting in the continuous melting device W2 is introduced through a hot water supply gutter 12. Furthermore, in addition to this molten metal, the molten metal obtained by melting in the melting furnace 10 is led to a holding furnace 16 as a second holding means through a water supply gutter 14. There, after being subjected to conventional treatments such as degassing and slag removal, it is supplied to a continuous casting device 20 through a pouring trough 18, and a target ingot 22 is continuously formed according to a conventional method. I'm starting to get it.

By the way, in such melting/casting operations, the breakdown of the metal materials melted is, on average, metal base metal: 40-70%, intermediate alloy 20-10%, and rotating scrap: 30-50%. , and the other 20 to 10%, so in the spirit of the present invention, a predetermined proportion of the bullion, for example, 20 to 50% of the bullion, is melted into continuous melting device 2.
The material was continuously and intensively preheated and melted.

On the other hand, other metal materials 2G except for the 24 g of metal melted in the continuous melting device 2, that is, the remaining metal materials, intermediate alloys, rotating scraps, etc., are melted in the continuous melting device 2. Excluding the raw metal portion melted in the main melting furnace, the amount is 80 to 50%, which not only reduces the time required to charge materials into the main melting furnace, but also effectively reduces the melting time. In addition, oxidation loss occurs during melting in the above-mentioned continuous melting equipment due to low-temperature melting due to material heat using exhaust gas, and in the main melting furnace, metal supplied from the continuous melting equipment By immersing materials in the main melting furnace that are easily oxidized at high temperatures into the molten metal, it was possible to effectively suppress the oxidation of the entire melting furnace.

In addition, in the continuous melting device 2 that melts the predetermined ratio of the metal ingot 24 to /8, one to three handles 28 made of the gold ingot 24 are charged into the melting chamber 4 in a packed layer. The material is continuously melted from the bottom by heating with a combustion heating device such as a burner provided at the bottom. Therefore, the amount of burner firing can be kept almost constant, and the combustion exhaust gas is guided upward through the gap between the packed layers of the metal base metal 24, which further heats and melts the metal base metal 24. This leaves them vulnerable to being punished. The hearth of the melting chamber 4 is
In general, it is a dry hearth, and the bare metal 24, which has already been preheated to a high temperature, is melted at a relatively low melting temperature, in a small hearth area, at high speed, with high efficiency, and with high efficiency using devices such as high-speed convection burners. It can be melted continuously at a yield, and the melting capacity can be, for example, about 2 to 6 tons/hour.

A preheating flue 8 extending horizontally is usually provided in the second part of the melting chamber 4, and a handle 28 of the metal base metal 24 is sequentially moved within this preheating flue 8. The combustion exhaust gas during melting that has passed through the packed bed of the metal ingot 24 in the melting chamber 4 is introduced into the preheating flue 8, thereby automatically preheating the metal ingot 24. As a result, the thermal efficiency can be further improved.

A more specific structure of such a continuous melting device 2 is shown in FIGS. 2 and 3, and such an exemplary structure is preferably adopted in the present invention. It is.

That is, in those figures, the rapid melting device 2 has a preheating flue 8 located above and extending in the horizontal direction, and a vertical direction opening at the front end of the preheating flue 8 into its floor. It has a cylindrical melting chamber 4 extending downward and a holding chamber 6 connected to the lower end of the melting chamber 4 and extending horizontally. - A charge door 30 is provided at the entrance of the preheating flue 8 so that it can be raised and lowered, and the entrance of the preheating flue 8 is opened and closed by the raising and lowering operation of the cylinder 32. Close to the entrance [] part,
An exhaust port 34 for exhausting exhaust gas is provided at the lower part of the side wall of the preheating flue 8.

Further, as clearly shown in FIG. 3, the dissolving chamber 4 has a shaft portion 36 having an elongated opening (cross-sectional shape), and a lower portion of the shaft portion 36 is provided with a shaft portion 36 for dropping. Burner devices 38, such as high-speed convection burners, for melting the laminated block-shaped handle 28 of the metal base metal 24 are provided on opposite side wall portions, and from the burner ports 40 slanted downwardly, The combustion flame or combustion exhaust gas of the burner device 38 is dropped into the bundle 2.
The base metal 24 constituting the base metal 8 is brought into contact with the base metal 24 .

In addition, the molten metal 42 obtained by melting in the melting chamber 4 is led to the holding chamber 6, where it is accommodated and held. A burner device 44 is provided to keep the metal melt @42 warm.

On the other hand, a material charging device 46 is provided close to the inlet side of the preheating flue 8 of such a continuous melting device 2. This material charging device 46 includes a slat conveyor 48, an alignment device 50, a lifting device 52, a truck 56 that can be guided by a rail 54 and can approach the entrance of the preheating flue 8, and a butcher 58. ing.

In such a material charging device 46, the material to be charged into the continuous melting device 2, that is, the handle 28 on which the predetermined metal ingots 24 are laminated, is transported by a forklift or other suitable method. is placed on the slat conveyor 48, and transported by the slat conveyor 48 to a lifting position by a lifting device 52. The bundles 28 stopped at this lifting position are aligned by an alignment device 50 in order to correct any collapse of the bundle that may have occurred during transportation. The aligned bundles 28 are then lifted up by the lowered lifting device 52 and placed on a trolley 56, after which the trolley 56 is brought close to the entrance of the preheating flue 8 and the chimney is opened. When the middle door 30 is open, the bushing 58
By ejecting the bundle 28, the stacked bundle 28 of metal ingots 24 is inserted into the preheating flue 8.

The metal ingot 24 is a long block-like object made of aluminum or its alloy, and generally has a substantially trapezoidal cross section in most of its longitudinal direction, and is a so-called big (pig). Such metal base metals 24 are arranged horizontally and stacked in multiple stages to form one bundle 28. In addition, such metal bullion 24
The shape of the metal and the laminated structure of the bundle 28 are disclosed in the applicant's earlier publication S (Japanese Patent Application No. 51-88984). A bundle laminated structure is preferably employed.

- and a bundle 2 of such predetermined metal ingots 24;
8 is pushed into the preheating flue 8 by the protruding action of the bushing 58 in FIG. The surface is slid forward, and the button 58 is moved forward by the pushing amount due to the protrusion action. Note that the injection by pushing the bundle 28 using the pusher 58 is automatically performed, and the injection timing is determined according to the required dissolution rate. And in this way, the preheating flue 8
The bundles 28 are automatically loaded one after the other, so that the most forward bundle 28 reaches the front end of the preheating flue 8 .

Furthermore, while the bundle 28 is moved through the preheating flue 8 from its inlet to the front end where the melting chamber 4 opens, the bundle 28 is effectively You can now preheat it.

In this embodiment, the floor surface 60 of the preheating flue 8 is inclined downward toward the opening of the melting chamber 4 provided at the front end thereof, so that the bundle 28
In addition, the cross section of the preheating flue 8 has a substantially rectangular inner shape, so that the exhaust gas is distributed evenly around the hand knob 28, which has a rectangular outer shape. The exhaust gas is constructed such that it can pass therethrough, and the existence of the outlet 34 provided at the lower part of the inlet section allows the thermal energy of the hot exhaust gas to be effectively used for preheating the handle 28.

The bundle 28, which has been preheated while being pushed forward in the preheating flue 8, is moved from its front end to the melting chamber 4.
, specifically an elongated rectangular or elliptical opening 62
The handle 28 that is dropped is pushed forward from the end of the preheating flue 8 by the pushing action of the handle 28 located behind it. This causes the vehicle to fall in an essentially overturned position.

The handle 28 in this overturned state
By falling, the metal base metal 24 constituting the metal base metal 24 is dispersed and positioned in the melting chamber 4 in a separate state, so that the melting operation by the lower burner device 38 can be carried out suitably.

The molten metal 42 obtained by melting the metal ingot 24 in the melting chamber 4 flows through the sloping hearth 2 of the melting chamber 4 and immediately flows into the holding chamber 6. A predetermined amount of the data will be pooled.

In this holding chamber 6, a pooled molten metal 42
is heated by a burner device 44, adjusted to a predetermined temperature, and is supplied to the main melting furnace 10 through a feed rate 12 in accordance with the timing of the main melting furnace 10.

The holding chamber 6 fulfills the function of adjusting the amount of hot water fed to the main melting furnace 10 and the timing of hot water feeding.

As a result, a predetermined proportion of the metal base metal (for example, 20 to 50% of the total metal material) of the metal material to be melted in the continuous melting device 2 is melted. The remaining metal material 26 charged into the main melting furnace 10 will be reduced accordingly (eg, to 50-80%). The melting operation in the main melting furnace 10 is a hatch-type operation, and the material of the melting material (26) varies, but by reducing the amount of metal base metal 24 that requires large heat input, In addition to saving labor in material charging work and shortening charging time, melting time can be effectively shortened, and oxidation loss caused by large heat input over a long period of time can also be effectively suppressed. It can be done. In the continuous melting apparatus 2 where the metal ingot 24 is melted in a concentrated manner, melting is carried out continuously and automatically, regardless of the batch-type melting operation of the main melting furnace 1o.

In this way, in the continuous melting bag W2, a predetermined ratio of 24 metals out of the charging material is intensively melted, so that the melting furnace as a whole achieves (1) labor saving in charging work; (2) Material preheating with exhaust gas improves thermal efficiency; (3) Material preheating with exhaust gas enables low temperature melting and improves melting yield; (4)
) Increased melting capacity and shortened melting time, and (5) matching with the holding furnace cycle made it possible to effectively achieve improvements in production capacity and productivity.

Incidentally, such an effect can be obtained by comparing the conventional melting/casting cycle for metal materials shown in FIG. 4 with the melting/casting cycle according to the present invention shown in FIG.
It will become obvious by itself. In addition, in the cycle according to the present invention shown in FIG. 5, the base metal corresponding to 30% of the metal material to be melted is intensively melted in the continuous melting device 2, and in both methods Also, the amount dissolved is said to be 60 tons.

As can be easily understood by comparing FIG. 4 and FIG. 5, according to the method according to the present invention, the material charging time and melting time in the main melting furnace 10 are significantly shortened.
As a result, the idle time of the holding furnace 16 is shortened, and the overall melting powder casting cycle is about 20% shorter in the method according to the present invention, compared to 6 to 8 hours/charge in the conventional method. Regarding thermal efficiency, the method of the present invention was improved by about 7 to 10% compared to the conventional method.

Although the present invention has been described in detail with respect to one specific example, the present invention is not to be construed as being limited only to the specific example and the accompanying explanation, and the gist of the present invention is not to be construed. It goes without saying that various changes, modifications, improvements, etc. can be made to the present invention based on the knowledge of those skilled in the art without departing from the scope of the present invention, and the present invention also includes such embodiments. is intended.

Furthermore, although the present invention was developed specifically for melting metal materials including base metals made of aluminum minilum or its alloys, it can also be used for melting and melting materials made of other metals.
It is also possible to apply it to casting operations.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an example of an integrated system of the present invention, FIG. 2 is a schematic cross-sectional front view of main parts showing a continuous melting device suitably used in the present invention, and FIG. 3 is a schematic cross-sectional front view of the device of FIG. m-
4 and 5 are explanatory diagrams of a melting/casting cycle showing an example of the conventional method and the method of the present invention, respectively. 2: Continuous melting device 4: Melting chamber 6: Holding chamber 8: Preheating flue 10: Main melting furnace 12, 14: Feed @ gutter 16: Holding furnace
18: & l gutter 20: Continuous casting device 22: Ingot 24: Metal ingot 26: Remaining metal material 28: Handle 38: Harna device 42: Molten metal 46: Material charging device 48: Thrust conveyor 50: Aligning device 52 : Lifting device 54: Rail 56: Trolley 58: Bubble 60: Floor 62: Opening -

Claims (2)

[Claims] (1) A melting/casting system that melts a specified metal material including a metal base metal and scrap to form a molten metal, and supplies this to a casting device to perform desired casting; A vertical melting system in which a predetermined proportion of gold is poured into a cylindrical melting chamber, and the metal is continuously and gradually melted by heating with a combustion heating device installed at the bottom of the melting chamber. means; a first holding means for accommodating and holding the molten metal obtained by melting the metal ingot taken out from the lower part of the melting chamber of the vertical melting means; a main melting means that receives a predetermined amount of molten metal and melts the remaining metal material other than the metal base metal melted by the vertical melting means; A casting device that receives the molten metal guided from the second holding means and casts a predetermined metal ingot from the molten metal. A system for melting and casting metal materials. (2) The vertical melting means has a preheating flue connected to the upper part of the melting chamber and extending in the horizontal direction, and the exhaust gas guided from the melting chamber is introduced into the preheating flue into the upper part of the melting chamber. 2. A system for melting and casting metal materials according to claim 1, wherein said metal base metal being moved toward a part is preheated.