JPH09159365A - Metal melting and holding furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a tap hole from being contaminated with metal oxides as much as possible to improve quality of a melt by guiding combustion gas of a melting burner through interiors of a first holding chamber and a second holding chamber via a melting chamber to an exhaust gas outlet made in a furnace wall in the vicinity of a surface of the melt in the second holding chamber. SOLUTION: A melting chamber 20 provided in communication with a lower portion of a charging chamber 10 and having a horizontally disposed melting burner B1 is formed and a temperature-keeping burner B2 for keeping temperature of a melt in the melting chamber 20 is provided in a holding chamber 30. The holding chamber 30 is partitioned into a first holding chamber 33 and a second holding chamber 34 by means of a bank 32 formed in a direction crossing a flowing direction of the melt. Combustion gas of the melting burner B1 is made to pass through the first holding chamber 33 and the second holding chamber 34 via the melting chamber 20 before being guided to an exhaust gas outlet 35 formed in a wall in a vicinity of a surface of the melt in the second holding chamber 34. Thus, a tap hole 40 can be prevented from being contaminated with metal oxides as much as possible to plan an improvement of quality of the melt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal melting and holding furnace that melts a metal material and keeps the resulting molten metal at a constant temperature.

[0002]

2. Description of the Related Art A metal melting and holding furnace of this kind is disclosed in Japanese Patent Publication No.
It is disclosed in Japanese Patent No. 319933 or the like. This furnace is provided with a tower-shaped elevated preheating chamber, and the combustion exhaust gas of the melting burner heats the material placed in the preheating chamber and then discharges it outside the furnace. Further, the holding chamber for keeping the molten metal warm and storing it is partitioned by a pumping chamber having a tap hole and one partition wall so that metal oxides and the like generated on the upper surface of the molten metal in the holding chamber hardly flow into the pumping chamber side. It is considered as a structure.

[0003]

In the above-described conventional metal melting and holding furnace, the metal material is preheated by the combustion exhaust gas of the melting burner, but the combustion exhaust gas is almost discharged to the outside of the furnace. It wasn't always good in terms of thermal efficiency. Rita materials such as sprues generated during casting are put back into the furnace and used.
Since the inlet provided above the preheating chamber is located at a height of about 2 to 3 m from the ground, when using the Ritanium material immediately after casting, the heat of about 100 to 200 ° C held by the Ritanium material is used. Will be dissipated while waiting to be thrown in. Further, since the metal oxide generated during melting flows into a large holding chamber and covers the entire molten metal surface, the heat of the holding burner may be difficult to transfer to the molten metal. Therefore, the atmospheric temperature in the holding chamber must be raised, and as a result, there is a disadvantage that metal loss is likely to occur during high temperature oxidation.

Therefore, an object of the present invention is to send the combustion exhaust gas of the melting burner into the holding chamber to effectively utilize it as a part of the holding heat of the molten metal, and to mix the metal oxide into the tap hole as much as possible. It is to prevent it and improve the quality of the molten metal.

[0005]

In order to achieve the above-mentioned object, the present invention is formed so as to communicate with a charging port for charging a metal material such as an ingot or a return material and a lower part of the charging port.
A melting chamber having a melting burner provided in a lateral direction, a holding chamber having a holding burner for keeping the temperature of the molten metal in the room, which has an inflow port into which the metal material heated and melted in the melting chamber flows, and the holding chamber In a metal melting and holding furnace having a tap hole formed so as to be communicated by being divided by a weir plate, the holding chamber is a first holding chamber defined by a weir formed in a direction transverse to the direction of travel of the molten metal. An exhaust port, which is partitioned into a second holding chamber, in which the combustion gas of the melting burner passes through the melting chamber, passes through the first holding chamber and the second holding chamber, and is formed in a wall portion near the molten metal surface of the second holding chamber. It is characterized in that it is configured to be guided to.

[0006]

According to the metal melting and holding furnace configured as described above, the metal material such as the ingot and the return material charged by the combustion gas of the melting burner is heated and melted, and the first material passes through the inflow port. Enter the second holding chamber from the holding chamber.
The molten metal in each chamber is maintained at a constant temperature by a holding burner provided in the holding chamber. The combustion gas of the melting burner is introduced into the first holding chamber and the second holding chamber via the melting chamber to heat the molten metal. However, the heating energy of the holding burner may be supplemented by about 20 to 30%, which is the shortage of the heating energy of the melting burner, so that the effect that the heating energy can be effectively utilized as a whole is produced.

Further, since the metal oxide generated during melting flows into the first holding chamber together with the molten metal and mainly stays in the first holding chamber, the heat of the holding burner is directly transferred to the molten metal in the second holding chamber, so that the atmosphere The temperature can be suppressed as compared with the conventional one, and the metal loss and heat loss due to high temperature oxidation are reduced. Further, since the metal oxide is almost prevented from flowing into the tap hole side from the second holding chamber, it is possible to always obtain a molten metal of excellent quality and at a stable temperature.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of the metal melting and holding furnace, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is BB of FIG.
FIG. 4 is a sectional view taken along the line CC of FIG.

The metal melting and holding furnace F shown in the figure is for melting a metal material such as aluminum and maintaining the molten metal produced by the melting at a constant temperature. In the furnace body 1, an upper furnace body 3 constructed of refractory bricks is placed on a lower furnace body 2 constructed of refractory bricks with a sealing material 4 made of ceramic fibers or the like interposed therebetween. The outside of the body 3 is appropriately covered with a heat insulating material, an iron plate, or the like, and is tightened by a frame (not shown) to be integrally formed. As shown in FIG. 2, the furnace body 1 is formed so as to communicate with a charging port 10 for charging a metal material such as an ingot or a return material, and the melting burner B ₁ is directed sideways and slightly downward. And a holding burner B ₂ for heating and holding the molten metal M in the chamber at a constant temperature. It is divided into a holding chamber 30 and a hot water outlet 40 formed so as to be communicated with the holding chamber 30 by a dam plate 41.

Although the charging port 10 is formed in the top portion 3a of the upper furnace body 3, since the heat retained by the retan material is effectively used, it is as low as possible so that the retan material can be promptly charged. Provide at the position.

The melting burner B ₁ provided in the melting chamber 20 is arranged so as to face the side wall 3b of the upper furnace body 3 as seen in a plane as shown in FIG. 1, and the combustion gas flame of the burner B ₁ is Once it hits the side wall 3b, it advances toward the holding chamber 30.

In the holding chamber 30, a weir 32 is formed near the inflow port 31 in a direction transverse to the traveling direction of the molten metal M,
Due to the weir 32, the first holding chamber 33 and the second holding chamber 3 on the front side
It is divided into 4 and. 35 is the molten metal surface L of the second holding chamber 34
An exhaust port for discharging the combustion exhaust gas formed on the nearby wall portion 3c, and 36 is a chimney attached to the outlet of the exhaust port 35.

The above-mentioned holding burner B ₂ is arranged substantially parallel to the molten metal surface L and slightly above the molten metal surface L.
Then, as shown by the arrow x in FIG. 1, the combustion gas of the melting burner B ₁ passes through the melting chamber 20 and passes through the first holding chamber 3
3. It is configured so as to pass through the inside of the second holding chamber 34 and be guided to the exhaust port 35 together with the combustion gas of the holding burner B ₂ . As a result, the molten metal M in the first holding chamber 33 and the second holding chamber 34 is heated by the combustion exhaust gas of the melting burner B ₁ . Therefore, the heating energy of the holding burner is
Approximately 2 which is the shortage of heating energy by the melting burner
Since it is sufficient to supplement about 0 to 30%, it is possible to save energy as a whole.

A communication port 42 through which the molten metal M in the second holding chamber 34 flows is provided below the dam plate 41 of the tap hole 40. The weir plate 41, in combination with the action of the weir 32,
The metal oxide in the holding chamber 34 is prevented as much as possible from entering the tap hole 40 side, and it is possible to always obtain high quality molten metal at the tap hole 40.

[Brief description of the drawings]

FIG. 1 is a plan view of a metal melting and holding furnace.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG.

[Explanation of symbols]

F → Metal melting and holding furnace B ₁ → Melting burner B ₂ → Holding burner L → Melting surface M → Melting metal 10 → Inlet port 20 → Melting chamber 30 → Holding chamber 31 → Inflow port 32 → Weir 33 → First holding chamber 34 → Second holding chamber 35 → exhaust port
40-> tap 41-> weir plate

Claims (1)

[Claims] 1. A charging port for charging a metal material such as an ingot or a return material, a melting chamber formed in communication with a lower portion of the charging port and provided with a melting burner in a horizontal direction, and heated and melted in the melting chamber. Has an inflow port through which the metal material
A holding chamber with a holding burner to keep the molten metal in the room warm,
In a metal melting and holding furnace having a tap hole formed so as to be communicated with the holding chamber by being divided by a weir plate, the holding chamber is provided with a weir formed transversely to the traveling direction of the molten metal. It is divided into a first holding chamber and a second holding chamber, and the combustion gas of the melting burner is formed on the wall portion of the second holding chamber near the molten metal surface through the melting chamber, the first holding chamber and the second holding chamber. A metal melting and holding furnace characterized by being configured so as to be guided to the exhaust port.