JPH038942Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement in the structure of a holding chamber of a melting and holding furnace for various metals including aluminum.

(Conventional technology and its problems) In a melting and holding furnace, aluminum raw materials are input from a material preheating tower, heated and melted in a melting chamber following the tower, then transferred to a holding chamber connected to the melting chamber, and heated with a holding burner. The process involves keeping molten aluminum at a predetermined temperature and pumping it out little by little from a well communicating with a holding chamber to perform casting.

Now, because the bottom of the holding chamber of the conventional melting and holding furnace used for such aluminum melting work is flat, low-temperature molten metal flows from the melting chamber into the holding chamber and directly enters the well, causing the temperature of the molten metal in the well to rise. The problem is that it causes the melting to drop, and that if low-temperature molten metal flows from the melting chamber into the holding chamber,
Precipitates such as Fe and Si can be seen, and these can flow into the well and mix into the product, causing product defects such as hard spots.The molten metal immediately after leaving the melting chamber contains a large amount of gas such as hydrogen. However, when molten metal that has absorbed gas is cast, there are various problems such as a high rate of product failure due to oxides.

(Purpose of the invention) The present invention was devised in view of the drawbacks of the conventional examples, and its purpose is to prevent the temperature of the molten metal in the well from decreasing, and to significantly reduce product defects due to the contamination of precipitates and oxides. The objective is to provide a revolutionary melting furnace with a submerged embankment that has been improved.

(Means for solving the problem) In order to achieve the above object, the present invention has a line connecting the dissolution chamber 8 and the well 2 at the bottom of the holding chamber 9 provided between the dissolution chamber 8 and the well 2. A plurality of submerged embankments 4 are protruded across the area.

; is adopted as a technical means.

(Function) First, the aluminum raw material is heated to the material preheating tower 7.
It is heated and melted in the melting chamber 8 following the tower 7.

The molten metal melted in the melting chamber 8 has a low temperature just above the melting point, and flows into the holding chamber 9.

In the holding chamber 9, the temperature is raised to a predetermined temperature by the holding burner 10, and the low-temperature molten metal that has flowed into the holding chamber 9 snakes along the submerged bank 4 and heads toward the well 2 while being heated.

During this time, the precipitates settle along the submerged bank 4, the absorbed gas is released, and the settled molten metal is supplied to the well 2.

The sedated molten metal in the well 2 is pumped out little by little and used for casting.

(Example) Hereinafter, the present invention will be described in detail according to the illustrated example.
The melting and holding furnace includes a material preheating tower 7, a melting chamber 8 connected to the lower part of the tower 7, a holding chamber 9 communicating with the melting chamber 8 at the bottom, and a well communicating with the holding chamber 9 at the bottom. It is composed of 2. A holding burner 10 is disposed in the holding chamber 9 so as to blow flame obliquely into the holding chamber 9 so that the flame circulates within the holding chamber 9 and flows into the melting chamber 8. A melting burner 11 is arranged substantially straight with respect to the chamber 8. The well 2 is provided with a molten metal level detection device 12, a temperature sensor 13, and the like. A plurality of (two in this embodiment) submerged banks 4 are protruded from the bottom of the holding chamber 9 so as to cross the line connecting the dissolution chamber 8 and the well 2. The first submerged bank 4a is provided with a first notch 3a on the side opposite to the molten metal inlet 5 that connects the melting chamber 8 and the holding chamber 9, and the second submerged bank 4b located next is provided with a first notch 3a on the opposite side. A second notch 3b is provided so that the molten metal flows in a meandering manner within the holding chamber 9.
Further, a hot air port 14 is provided above the molten metal inlet 5, and a partition wall 6 is provided between the hot air port 14 and the molten metal inlet 5.

Next, explanation will be given using aluminum melting work as an example. Of course, melting operations are not limited to aluminum only. Now, in the holding chamber 9, a flame is emitted from the holding burner 10 so as to swirl inside the holding chamber 9, and the molten aluminum in the holding chamber 9 is maintained at a predetermined temperature. The flame radiated into the holding chamber 9 swirls inside the holding chamber 9 and then becomes high-temperature exhaust gas and enters the melting chamber 8 through the hot air port 14 provided in the partition wall 6 between the holding chamber 9 and the melting chamber 8. , the aluminum raw material in the melting chamber 8 is preheated or melted. Aluminum raw materials are timely charged into the material preheating tower 7 in accordance with the pumping of molten aluminum, and are preheated or melted by the high-temperature exhaust gas that passes through the melting chamber 8 and exits the material preheating tower 7. In the melting chamber 8, the aluminum raw material is melted as described above, but the melting burner 11 is turned on as necessary when there is insufficient heat or when melting must be carried out quickly. The aluminum thus melted flows into the holding chamber 9 through the molten metal inlet 5 at the bottom of the partition wall 6, meandering inside the holding chamber 9 along the submerged bank 4, and flows into the well 2. The molten metal immediately after melting, regardless of direct flame melting or immersion melting, stores a large amount of gas such as hydrogen gas, but due to the long residence time in the holding chamber 9, the release of the stored gas is observed, and the inflow into the well 2. By this time, the molten metal has calmed down. In addition, since the molten metal immediately after melting is at a low temperature just above the melting point, precipitates such as Fe and Si can be seen on the hearth of the holding chamber 9, but they are blocked by the submerged bank 4 and do not flow into the well 2. There is no. Furthermore, the low-temperature molten metal that has just been melted does not flow into the well 2 immediately, but meanderes along the submerged bank 4, which increases the temperature to a predetermined temperature and causes a situation in which the temperature of the molten metal in the well 2 decreases. It's something that doesn't happen.

In addition, due to the presence of the submerged bank 4, the weight of the molten metal in the holding chamber 9 is reduced by that amount, and the heat receiving area can be reduced.

(Effects) As described above, the present invention has a plurality of submerged banks protruding from the bottom of the holding chamber provided between the dissolution chamber and the well so as to cross the line connecting the dissolution chamber and the well. Therefore, the metal that is melted in the melting chamber and flows into the holding chamber snakes inside the holding chamber along the submerged bank and flows into the well, but during this time, occluded gas is released, and the molten metal settles down by the time it flows into the well. is being implemented, and
It is possible to prevent contamination of oxides such as Ai ₂ O ₃ , and the precipitates from the low-temperature molten metal immediately after melting settle along the submerged bank and do not flow into the well. The low-temperature molten metal is blocked by the submerged dike and does not flow directly into the well, but rather meander along the submerged dike, raising the temperature to a predetermined temperature and causing a situation in which the temperature of the molten metal in the well decreases. All of them are highly effective in improving product quality. In addition, the presence of the submerged embankment reduces the weight of the molten metal in the holding chamber, reducing the heat receiving area.
As a result, the holding chamber can be made compact, and the entire melting and holding furnace can be constructed more compactly.

[Brief explanation of the drawing]

Fig. 1...A plan sectional view of the melting and holding furnace of the present invention, Fig. 2...A sectional view taken along the line Y-Y in Fig. 1, Fig. 3...A sectional view taken along the line X-X in Fig. 1, 1... ...Melting furnace, 2... Well, 3a... First notch, 3b... Second notch, 4... Submerged levee, 4a... First submerged levee, 4b... Second submerged levee, 5... Molten metal inlet, 6... Partition wall, 7...
... Material preheating tower, 8 ... Melting chamber, 9 ... Holding chamber, 10 ... Holding burner, 11 ... Melting burner,
12... Molten metal level detection device, 13... Temperature sensor, 14... Hot air port.

Claims (1)

[Scope of utility model registration request] A melting furnace with a submerged embankment, characterized in that a plurality of submerged embankments are protruded from the bottom of a holding chamber provided between the melting chamber and the well so as to cross a line connecting the melting chamber and the well.