JPH091322A - Holding furnace - Google Patents

Abstract

PURPOSE: To provide a holding furnace, in which the oxide is removed and further, the flow of molten metal is smooth without damaging the thermal conductivity. CONSTITUTION: In the holding furnace 1, the molten metal received from a receiving part 3 is heated with a heater 4 of heating part 5 and discharged from a discharge part 6. A trapping wall 7 is arranged at the intermediate part of the heating part 5 between the receiving part 3 and the discharge part 6, and only molten aluminum on the upper layer near the molten metal surface (a) is passed by this trapping wall 7. Further, a part of this trapping wall 7 may be a window-like filter 8 or arranged in a horizontally zig-zag state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a hand-held furnace for molten aluminum or aluminum alloy, which is arranged in the vicinity of, for example, a casting machine.

[0002]

2. Description of the Related Art Conventionally, for example, in order to supply molten aluminum or aluminum alloy to a casting machine, a hand-held furnace is arranged close to the casting machine. As shown in FIG. 5, for example, as shown in FIG. 5, the hand furnace 50 has a structure in which aluminum molten metal is temporarily stocked so that a required amount can be taken out by a ladle or the like and melted in a melting furnace or the like. It is provided with a receiving section 51 that receives the molten aluminum, a heating section 52 that heats the received molten aluminum to keep it warm, and a pumping section 53 that pumps out the molten aluminum with a ladle or the like.

By the way, the receiving part 5 of such a hand-held furnace
When the molten aluminum is replenished from No. 1, the molten metal directly flows into the pumping section 53 with a vigorous force, and the molten metal in the pumping section 53 causes up and down convection, and impurities such as hard oxides having a large specific gravity move upward from below. There is a problem of rolling up. And
When the impurities rolled up are pumped out by a ladle or the like and cast, the cutting tool is likely to be damaged when cutting the cast product, and also causes defective molding. Therefore, for example, in Japanese Utility Model Publication No. 60-5977, the pumping section 53
A container-shaped filtering device, a part of which has a filter structure, is provided at the pumping outlet of the pump so as to pump out the filtered molten aluminum from the container.

[0004]

However, in the above technique, since the filtering device is made into a container shape and the filtered molten metal is introduced into the container, for example, if the filter is clogged, it cannot be filtered and clogging occurs. It was not possible to pump out the molten metal without solving the problem. In addition, since the filtration device is provided in the pumping part far from the heating part and in the container, the thermal conductivity is deteriorated and the temperature of the molten metal poured into the casting machine tends to be lowered. There was also a problem.

Therefore, even if the filter is clogged, the molten metal can be smoothly moved, and the molten metal can be pumped out without impairing the heat conduction of the heating portion and with the impurities such as oxides being surely removed. There was a desire for a hand reactor that could

[0006]

In order to solve the above problems, the present invention is directed to a receiving furnace in which a molten metal received from a receiving section is heated by a heating section to keep it warm and to be pumped out from a pumping section. And a trap wall between the pumping section and
The trap wall prevents the molten metal in the pumping section from convection in the vertical direction. In the second aspect, the trap wall is arranged so as to allow only the molten metal in the upper layer near the liquid surface to pass through. Further, as in claim 3, the trap walls may be arranged in a staggered manner in a plan view. Further, in claim 4, the trap wall is provided in the middle portion of the heating portion. Further, in claim 5, at least a part of the trap wall has a filter structure.

[0007]

[Function] Since impurities such as oxides have a large specific gravity and sink in the molten aluminum, if the upper layer molten metal is cleaned in the pumping section, a clear molten metal can be pumped out. For this reason, the trap wall impedes the force of the molten metal received in the receiving section to flow into the pumping section, prevents convection in the pumping section, and prevents the oxide in the receiving section from flowing into the pumping section. The trap wall may be of a type allowing only the upper layer of the molten metal to pass therethrough as in claim 2, or may be staggered in a plan view as in claim 3. The trap wall weakens the force of the molten metal flowing in toward the pumping-out portion, and gently causes the molten metal to flow in to prevent convection in the vertical direction. At this time, if the trap wall is provided in the intermediate portion of the heating portion as in the fourth aspect, the thermal conductivity of the pumping portion to the molten metal is not impaired. Further, if at least a part of the trap wall has a filter structure as in the fifth aspect, the molten metal can smoothly flow into the pumping section. Further, even if the filter is clogged, the molten metal can pass through.

[0008]

An embodiment of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a cross-sectional view showing the internal structure of the hand-held furnace of the present invention seen from the front, and FIG. 2 is a cross-sectional view seen from the side. The hand furnace 1 of the present invention is arranged close to a casting machine that casts aluminum or aluminum alloy, and temporarily holds the molten aluminum melted in the melting furnace.
When casting, the required amount is pumped out by a ladle etc. and poured into the casting machine.

Therefore, as shown in FIG. 1, the hand furnace 1 is provided with a reservoir 2 for temporarily stocking the molten aluminum, and the reservoir 2 receives the molten aluminum supplied from the melting furnace. It comprises a receiving section 3, a heating section 5 in which a heater 4 such as a sheath heater is arranged, and a pumping section 6 which is pumped out by a ladle or the like. The molten aluminum replenished from the receiving unit 3 receives heat from the heater 4 in the heating unit 5 and is maintained at a predetermined temperature, and the molten aluminum kept at the predetermined temperature is pumped out from the pumping unit 6.

By the way, in the storage part 2, an oxide having a higher specific gravity and a harder hardness than the molten aluminum precipitates in the lower layer, and in particular, when the oxide precipitated in the lower part of the pumping part 6 winds up by convection, it is cast. Sometimes it gets into the machine and is cast together. And when the oxide is cast together like this,
Usually, there is a problem that it cannot be found by appearance, and the cutting tool is damaged in the cutting process in the next process.

Therefore, in the present invention, as shown in FIG. 1 or 2, a trap wall 7 is provided in the middle portion of the heating portion 5 to prevent vertical convection of the molten aluminum in the pumping portion 6. That is, the trap wall 7 is configured such that the width thereof is the full width of the storage portion 2 and the height of the upper end b is the liquid level a.
It is arranged so as to be located at a predetermined depth from the above, and only the passage of the upper layer aluminum melt near the liquid level a is allowed. The trap wall 7 is made of a material such as a fire-resistant steel surface coated with a fire-resistant material.
Incidentally, the clearance between the liquid level a and the upper end b of the trap wall 7 is 130 mm in the embodiment.

A window-shaped filter 8 is provided in a part of the intermediate portion of the trap wall 7. The filter 8 is, for example, a ceramic porous body, and can be attached to and detached from the trap wall 7 as needed.

The operation of the above-mentioned hand furnace 1 will be described. The molten aluminum melted in the melting furnace is replenished from the receiving section 3. Then, the oxide that precipitates in the lower layer of the molten aluminum tries to flow into the pumping section 6 together with the molten aluminum, but the oxide is blocked by the filter 8 and only the filtered molten aluminum flows in. Further, when the liquid level a exceeds the upper end b of the trap wall 7, the relatively clean aluminum melt in the upper layer also flows in. By the action of the filter 8 of the trap wall 7 and the trap wall 7 itself, not only the amount of oxide flowing into the pumping-out portion 6 can be reduced, but also the momentum of the inflowing molten aluminum can be attenuated. Thus, the convection of the molten metal in the pumping section 6 in the vertical direction can be suppressed.

Further, even if the filter 8 is clogged, the molten aluminum flows from the upper part of the trap wall 7, and therefore the inflow does not stop at all. Further, since the trap wall 7 is arranged in the middle of the heating unit 5, the heat transfer action of the heater 4 is not obstructed with respect to the molten aluminum in the pumping unit 6, and the molten aluminum having an appropriate temperature is poured into the casting machine. You can make hot water.

Next, FIG. 3 is a diagram of another embodiment using the trap wall 10 which is not partly formed into a filter structure. That is, the trap wall 7 has the same structure except for the filter 8 so that only the upper layer of the molten aluminum flows into the pumping section 6. In this case as well, by dampening the momentum of the molten aluminum which flows into the pumping part 6 from the receiving part 3 and blocking the inflowing oxide, the oxide in the molten aluminum pumped out from the pumping part 6 is reduced. Can be suppressed.

Further, FIG. 4 shows the trap walls 11, 12, 1
FIG. 3 is a plan view of yet another embodiment in which 3 are arranged in a staggered manner in a plan view. In this case as well, the momentum of the molten aluminum flowing into the pumping section 6 from the receiving section 3 can be attenuated, and convection of the molten aluminum in the pumping section 6 in the vertical direction can be suppressed.
It should be noted that the trap walls 10, 11 to 13 are also used in these other embodiments.
Is preferably provided in the middle of the heating unit 5 from the viewpoint of thermal conductivity.

[0017]

As described above, in the hand-held furnace of the present invention, when the molten metal received in the receiving section is flowed into the pumping section, the momentum is attenuated by the trap wall and the vertical convection in the pumping section is prevented. In addition, since the oxide that flows in directly is blocked, it is possible to prevent the oxide in the lower layer from mixing in when pumping out the molten metal with a ladle, etc., and to prevent the cutting tool from being damaged in the cutting process in the next process etc. You can do it. On this occasion,
If the trap wall is provided in the middle part of the heating part, the casting quality can be improved without impairing the thermal conductivity of the pumping part to the molten metal. If at least a part of the trap wall has a filter structure, the molten metal can be more smoothly introduced into the pumping section.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the internal structure of a hand-held furnace of the present invention as seen from the front.

FIG. 2 is a sectional view as viewed from the side.

FIG. 3 is a diagram of another embodiment using a trap wall having no filter structure.

FIG. 4 is a diagram of another embodiment in which the trap walls are arranged in a staggered manner.

FIG. 5 is a conventional explanatory view.

[Explanation of symbols]

1 ... Hand furnace, 3 ... Receiving part, 4 ... Heater, 5 ... Heating part,
6 ... Pumping unit, 7 ... Trap wall, 8 ... Filter.

Claims (5)

[Claims] 1. In a hand-held furnace in which the molten metal received from the receiving section is heated by a heating section to keep it warm and to be pumped out from the pumping section, a trap wall is provided between the receiving section and the pumping section. A manual furnace characterized by a trap wall that prevents the molten metal in the pumping section from convection in the vertical direction. 2. The manual furnace according to claim 1, wherein the trap wall is arranged so as to allow only the molten metal in the upper layer near the liquid surface to pass therethrough. 3. The manual reactor according to claim 1, wherein the trap walls are arranged in a staggered pattern in a plan view. 4. The manual furnace according to claim 2 or claim 3, wherein the trap wall is provided in an intermediate portion of the heating section. 5. The manual reactor according to claim 2, wherein at least a part of the trap wall has a filter structure.