JPH0792336B2 - Metal continuous melting and holding furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous metal melting and holding furnace having a melting chamber, a holding chamber, a processing chamber and a pumping chamber.

[0002]

2. Description of the Related Art As a conventional technique, there is one shown in FIG. 5 or FIG. First, as shown in FIG. 5, a main body 1 having a rectangular shape in plan view is formed from a furnace material, and the inside of the main body 1 is divided by the first partition wall 2 to the fourth partition wall 5. The holding chamber 7 and a processing chamber 8 and a pumping chamber 9 that are adjacent to each other on the left and right sides are formed on the front side of the holding chamber 7, and each of the first partition wall 2 to the third partition wall 4 has a first communication hole 2a to
The third communication hole 4a is formed so that the dissolution chamber 6 and the holding chamber 7, the holding chamber 7 and the processing chamber 8, and the processing chamber 8 and the pumping-out chamber 9 communicate with each other.

Further, as shown in FIG. 6, a main body 1 having a rectangular shape in a plan view having a narrow front portion is formed of a furnace material, and the inside of the main body 1 is partitioned by first partition wall 2 to third partition wall 4. The melting chamber 6, the holding chamber 7, the processing chamber 8, and the pumping chamber 9 are formed in series in the front-rear direction, and the first partition wall 2 to the third partition wall 4 are respectively connected to the first communication holes 2a to 3rd. The communication hole 4a is formed so that the melting chamber 6 and the holding chamber 7, the holding chamber 7 and the processing chamber 8, and the processing chamber 8 and the pumping chamber 9 are connected to each other.

Then, the aluminum alloy is sequentially melted in the melting chamber 6, the molten metal is flowed from the first communicating hole 2a to the holding chamber 7 and is primarily held, and the molten metal held in the holding chamber 7 is held. It is made to flow from the 2nd communicating hole 3a to the process chamber 8, and a flux is added here or nitrogen gas and argon gas are blown in, and oxides, hydrogen gas, etc. in molten metal are removed and it cleans. Further, the melt became cleaned with the process chamber 8 to flow from the third communication hole 4a in pumping and chamber 9, caster out 汲 a melt of該汲up compartment 9 pouring to transport the (not shown) To do.

[0005]

In the above-mentioned conventional apparatus, as shown in FIG. 5, the pumping-out chamber 9 is partitioned from the holding chamber 7 by the fourth partition wall 5, or as shown in FIG. Since the chamber 9 is separated by the processing chamber 8, the temperature difference between the molten metal in the holding chamber 7 and the molten metal in the pumping chamber 9 is 8
In order to obtain the temperature of the molten metal required for casting in the pumping chamber 9, the temperature of the molten metal increases from 0 ° C. to 120 ° C., or the temperature of the molten metal in the holding chamber 7 is raised more than necessary, or the lowered temperature of the molten metal is burned or the like. It was supposed to be reheated by the heating device of.

Therefore, the former, that is, the one in which the temperature of the molten metal in the holding chamber 7 is raised, increases the generation of oxides in the molten metal, increases the absorption of hydrogen gas, and shortens the life of various members constituting the furnace. There are drawbacks such as a decrease, an increase in the fuel cost required for melting, and an increase in the degree of depletion when the aluminum alloy contains active ingredients such as magnesium, phosphorus and sodium which are easily oxidized. The latter, that is, the one for reheating the lowered temperature of the molten metal, has a drawback that equipment and fuel necessary for the reheating are required, and extra cost is added. It is an object of the present invention to obtain a novel metal continuous melting and holding furnace which solves the above drawbacks.

[0007]

The present invention is configured as follows to achieve the above object. That is, a partitioning wall that partitions the interior of the main body to form a melting chamber, a holding chamber, a processing chamber, and a pumping chamber which are adjacent to each other, and also partitions the melting chamber and the holding chamber, the holding chamber and the processing chamber, and the processing chamber and the pumping chamber. In a continuous metal melting and holding furnace in which first to third communicating holes are formed to connect the holding chamber and the pumping chamber, the holding chamber and the pumping chamber are adjacent to each other, and a partition wall for partitioning the holding chamber and the pumping chamber is provided. A fourth communication hole that connects the two is formed, and the fourth communication hole is located below the surface of the molten metal in the holding chamber and the pumping chamber to allow the molten metal in the processing chamber to flow toward the pumping chamber.
It is obtained by a structure in which Ru provided flow generating apparatus. The flow
The generator consists of a rotary degasser with rotating blades.
The molten metal in the processing chamber by the rotary blades of the rotary degassing device.
It is advisable to adopt a configuration in which the fluid flows in the direction of the pumping chamber. Also before
At the bottom of the processing chamber, there is an adjustment that slopes upward toward the third communication hole.
It is advisable to provide a flow wall.

It is preferable that the processing chamber is provided with a flow generator for flowing the molten metal in the processing chamber toward the pumping chamber.
The flow generator may be a rotary degasser having rotary blades, and the rotary blades of the rotary degasser may cause the molten metal in the processing chamber to flow toward the pumping chamber.
Further, it is preferable that a rectifying wall that slopes upward toward the third communication hole is provided at the bottom of the processing chamber.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a plan view corresponding to II-II thereof, and FIG. 3 is III-I of FIG.
II sectional view, and FIG. 4 is a sectional view corresponding to IV-IV in FIG. In FIGS. 1 and 2, reference numeral 10 denotes a main body formed in a rectangular parallelepiped shape by a furnace material. The main body 10 is partitioned by first partition wall 11 to fourth partition wall 14 to adjoin left and right melting chambers 1.
5, a holding chamber 16, and a processing chamber 17 and a pumping chamber 18 that are adjacent to each other in the width direction on the left side of the holding chamber 16 are formed. The melting chamber 15 is designed to sequentially melt the aluminum alloy in this example.

The first partition wall 11 to the fourth partition wall 14 are formed with the first communication hole 11a to the fourth communication hole 14a, respectively, so that the dissolution chamber 15 and the holding chamber 16 and the holding chamber 16 and the processing chamber 1 are formed.
7, the processing chamber 17 and the pumping chamber 18, and the pumping chamber 18 and the holding chamber 16 are connected to each other. As shown in FIGS. 1 and 4, the second communication hole 12a, the third communication hole 13a, and the fourth communication hole 14a have the molten metal level of the holding chamber 16, the processing chamber 17, and the pumping chamber 18, respectively. ) Below.

The third communication hole 13 is provided at the bottom of the processing chamber 17.
A straightening wall 17a that slopes upward toward a is formed, and the molten metal in the processing chamber 17 is pumped out into the processing chamber 17.
A flow generating device 19 for flowing in the direction is provided. The flow generating device 19 is composed of a rotary degassing device. As shown in FIGS. 3 and 4, a hollow rotary shaft 19a is erected at a corner of the processing chamber 17, and a rotary blade is provided at the lower end of the rotary shaft 19a. 1
9b is attached, and an inert gas such as nitrogen gas or argon gas is supplied to the lower portion of the processing chamber 17 from the axial center portion of the rotary shaft 19a, and the rotary blade 19b is connected to the rotary blade 19b via the rotary shaft 19a.
Turn right at. As a result, the inert gas removes and cleans oxides, hydrogen gas, and the like from the molten metal in the processing chamber 17, and causes the purified molten metal in the processing chamber 17 to flow toward the pumping chamber 18 by the rotary vanes 19b.

According to the above-described embodiment, the molten metal in the pumping chamber 18 directly contacts the molten metal in the holding chamber 16 at the fourth communicating hole 14a, and heat is supplied at this portion to retain the molten metal in the pumping chamber 18 The temperature difference from the molten metal in the chamber 16 will be reduced. In this example, the temperature difference could be reduced to within 10 ° C. Moreover, since the molten metal in the processing chamber 17 is made to flow toward the pumping chamber 18, the replenishment of the molten metal pumped in the pumping chamber 18 is supplied from the processing chamber 17 side by the rotary flow, and is pumped out in the same manner as in the conventional case. The clean molten metal can be taken out from the chamber 18. Since the fourth communication hole 14a is located below the molten metal surface (a) of the holding chamber 16, impurities floating above the molten metal of the holding chamber 16 flow into the pumping chamber 18. In addition, the flame of the combustion burner in the holding chamber 16 does not blow out into the pumping chamber 18.

The molten metal processed in the processing chamber 17 is supplied by the flow generator 19 to the pumping chamber 18 and the fourth communicating hole 14.
a, the holding chamber 16 and the processing chamber 17 are gently circulated, and the entire molten metal in the furnace including the holding chamber 16 is cleaned. Furthermore, it prevents the temperature of the molten metal in the pumping chamber 18 from decreasing,
This will make the temperature of the molten metal in the furnace uniform. Further, by providing a straightening wall 17a that is inclined upward toward the third communication passage 13a at the bottom of the processing chamber 17, the molten metal in the processing chamber 17 is guided by the straightening wall 17a and directed toward the upper surface of the center of the pumping chamber 18. And flows and the impurities generated in the pumping chamber 18 are pushed away to the peripheral wall surface of the pumping chamber 18. This allows
A clean molten metal is constantly present on the central upper surface of the pumping chamber 18, and the clean molten metal can always be pumped out in the pumping chamber 18.

[0014]

As is apparent from the above description, according to the present invention, the temperature difference between the holding chamber and the pumping chamber is reduced,
The temperature of the molten metal in the pumping chamber can be adjusted to the temperature required for casting without raising the temperature of the molten metal in the holding chamber excessively, reducing fuel consumption and reducing the generation of oxides in the molten metal. It is possible to obtain high quality molten metal. In addition, since the temperature of the molten metal in the holding chamber can be reduced, the life of various members forming the furnace can be extended.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view taken along line II-II of FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a cross-sectional view corresponding to IV-IV in FIG.

FIG. 5 is a plan view showing a first conventional example.

FIG. 6 is a plan view showing a second conventional example.

[Explanation of symbols]

 10 Main body 11 1st partition wall 11a 1st communicating hole 12 2nd partition wall 12a 2nd communicating hole 13 3rd partition wall 13a 3rd communicating hole 14 4th partition wall 14a 4th communicating hole 15 Melting chamber 16 Holding chamber 17 Processing Chamber 17a Flow straightening wall 18 Pumping chamber 19 Flow generator (rotary degassing device) 19a Rotating shaft 19b Rotating blade (a) Metal surface

Claims (3)

[Claims] 1. A main chamber is partitioned to form a melting chamber, a holding chamber, a processing chamber, and a pumping chamber which are adjacent to each other, and a melting chamber and a holding chamber, a holding chamber and a processing chamber, and a processing chamber and a pumping chamber are partitioned. In a continuous metal melting and holding furnace in which first to third communicating holes are formed in each partition wall for communicating the two, the holding chamber and the pumping chamber are adjacent to each other, and the holding chamber and the pumping chamber are separated from each other. A fourth communication hole is formed in the partition wall for communicating the both with each other, and the fourth communication hole is located below the surface of the molten metal in the holding chamber and the pumping chamber to pump out the molten metal in the processing chamber.
A continuous metal melting and holding furnace which is provided with a flow generating device for flowing in a direction . 2. The flow generating device has rotating blades.
A rotary degassing device, and rotary blades of the rotary degassing device
That the molten metal in the processing chamber was pumped out and made to flow toward the chamber.
The continuous metal melting and holding furnace according to claim 1, which is characterized in that. 3. The bottom of the processing chamber faces the third communication hole.
A straightening wall which is inclined upwardly is provided.
The continuous metal melting and holding furnace according to 1 or 2.