JPH0268485A - Continuous melting-feeding furnace - Google Patents

Abstract

PURPOSE:To continuously feed an accurate volume of molten metal at an adequate temperature from a crucible by tilting a gutter-like furnace with a melting coil so that its end is opened above the crucible with heating coil and a feed nozzle, free to open and close, on its bottom. CONSTITUTION:A molten metal feed nozzle 3 is furnished on the bottom of a crucible 1, and is opened and closed by a stopper 2 that moves up and down. A heating coil 4 installed around the periphery of the crucible 1 heats molten metal 5 up to a suitable temperature for feeding. A cylindrical furnace 6 is diagonally located above the crucible 1, and the end of the furnace 6 is opened above the crucible 6. A melting coil 7 is installed around the periphery of the furnace 6. The metal in the furnace 6 is heated up to a certain temperature to turn it into semi-molten metal 8 and dripped down without much fluctuation in the flow rate. The molten metal received by the crucible 1 is continuously fed into molds each by each at an accurate volume of molten metal through the nozzle 3 that is opened and closed by the stopper 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is a continuous melting method in which a cold material is melted by induction heating, and the resulting molten metal is cut into small pieces and continuously poured into, for example, a casting machine. Regarding pouring furnaces.

[Conventional technology]

For melting furnaces or pouring furnaces that dispense molten metal,
- Pressurized pouring furnace shown in No. 43153, JP-A-62-
Tilting crucible furnace shown in No. 190691, Utility Model No. 6
There is a stopper type crucible furnace shown in No. 2-76895.

The above-mentioned pressurized pouring furnace is equipped with an inductor for induction heating in the hot water storage chamber that receives pre-melted molten metal from the outside, and raises or maintains the temperature of the molten metal to a temperature suitable for pouring. Gas pressure is applied to the chamber, and a controlled amount of molten metal is cut into small pieces and poured from a nozzle at the tip of a conduit rising from the bottom of the hot water storage chamber.

The above-mentioned tilting crucible furnace is equipped with an induction heating coil around the outer periphery of the crucible, and after a cold material such as an ingot is put into the crucible and melted, the crucible is tilted to release the required amount from the gutter-shaped outlet at the top of the crucible. Tap out the molten metal.

The stopper-type crucible furnace described above has a nozzle at the bottom of the crucible having an induction heating coil on its outer periphery, and the required amount of molten metal is dispensed by opening and closing the nozzle.

These crucible furnaces include those that melt and tap cold materials, and those that receive pre-melted molten metal from the outside, keep the molten metal warm, and function exclusively for pouring.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, the pressurized pouring furnace allows easy control of the pouring amount and is suitable for, for example, continuously pouring small pieces of metal into molds, etc.; It is difficult to melt cypress wood, and in order to continuously cut more than the entire volume of the hot water storage chamber into small pieces, the molten metal must be received externally.

In addition, since the tilting type pours the melt by tilting the crucible, the accuracy of the amount of poured metal is relatively low, and it is not suitable for pouring into molds, etc. Therefore, for such applications, the pressurized pouring furnace or the stopper type is recommended. Molten metal must be poured through a crucible furnace.

The stopper type allows you to control the melting from the cypress material and the amount of molten metal poured into the crucible, but if you add the cypress material after pouring the entire amount of molten metal into the crucible or during the process, the temperature of the molten metal will rise until melting or reach a temperature suitable for pouring. You have to wait until it warms up before pouring water.

The purpose of this invention is to create a continuous melt pouring metal that can receive and melt cypress materials such as ingots, maintain the temperature of the molten metal suitable for pouring at all times, and control the amount of poured metal to continuously cut out small pieces. The purpose is to obtain a furnace.

[Failure to solve the problem]

This invention has a melt pouring nozzle that can be opened and closed with a stopper at the bottom of the furnace of a crucible equipped with a heating coil for temperature raising on the outer periphery, and a gutter-shaped furnace body equipped with a heating coil for melting on the outer periphery is tilted. The lower end of the crucible is opened at the upper part of the crucible.

[Effect]

The metal in the inclined furnace body equipped with heating coils for melting is heated and becomes fluid as it changes from a solid phase to a liquid phase and flows down the inclined surface. Therefore, semi-molten material at a constant temperature always drips from the furnace body, and its flow rate continues without major fluctuations. A crucible that receives a substantially constant flow rate of molten metal at a constant temperature will theoretically never become empty for an infinite period of time, and the molten metal temperature can be easily maintained and controlled with high accuracy. Then, by opening and closing the stopper, a precise amount of molten metal is cut into small pieces from the nozzle and continuously poured into the mold or the like.

〔Example〕

FIG. 1 is a sectional view of the embodiment. At the bottom of the furnace of the crucible 1 is a nozzle 3 that can be opened and closed with a stopper 2 that moves up and down.
is open. A heating coil 4 for heating is provided around the outer periphery of the crucible 1, and the molten metal 5 in the crucible 1 is heated by induction to raise the temperature of the molten metal 5 to a temperature suitable for pouring and keep it warm.

A cylindrical furnace body 6 made of a refractory material is arranged at an angle above the crucible 1, and the lower end of the furnace body 6 is open to the upper part of the crucible 1. A heating coil 7 for melting is installed on the outer periphery of the furnace body 6.
is provided, and this heating coil 7 inductively heats the metal inside the furnace body 6. Since the furnace body 6 is inclined, when the metal therein melts into a semi-molten state, the semi-molten material 8 drips down the inner wall of the furnace body 6 into the crucible 1.

Although it is easier to manufacture the furnace body 6 if it is formed into a cylindrical shape, in principle it may be formed into a gutter shape, and the upper part of the furnace body 6 is covered with a heat insulating material made of a material different from that of the furnace body in order to insulate the heating coil 7. It may be made into a shape.

A furnace body 11 equipped with a heating coil 10 for preheating a block-shaped melting material 9 such as a billet is connected to an opening at the upper end of the furnace body 6. There is a rail (not shown) near the bottom inside the furnace body 11 to hold the melted material 9, and the melted material 9 is carried on the rail by a conveying means (not shown) to the furnace body 6.
It is preheated while being conveyed towards.

The heating coil 10 and the furnace body 11 are not essential, and the melting material 9 made of cypress wood may be directly conveyed to the furnace body 6 equipped with the heating coil 7 for melting. At this time, the capacity of the heating coil 7 increases by the amount of preheating. Furthermore, since there will be more unmelted molten material near the upper end of the furnace body 6, the furnace body should be Make the angle of inclination in step 6 a little smoother.

According to the embodiment described above, by moving the stopper 2 up and down to open and close the nozzle 3, a controlled amount of molten metal can be poured into a mold or the like in a small opening. Even if the capacity of the crucible 1 is not large, molten metal is always received from the furnace body 1, so the crucible 1 never becomes empty.
Molten metal can be cut into small pieces continuously for a long time, theoretically an infinite amount of time. In particular, since the semi-molten material 8 has a constant temperature determined by the material, the crucible 1 receives molten metal at a constant temperature almost continuously, and the temperature of the molten metal in the crucible 1 can be changed suddenly like when a solid material is introduced. I have nothing to do. Therefore, the crucible 1 can always maintain a temperature suitable for pouring metal into a mold, etc., and small pieces can be continuously cut in this respect. At the same time, the temperature control by the heating coil 4 becomes narrower, further making it easier to maintain the appropriate pouring temperature.

When changing the mold and changing the required pouring amount, or when changing the pouring takt time, the time average of the pouring amount from the nozzle 3 of the crucible 1 changes. At this time, the amount of molten material 9 transported to the furnace body 6 per hour is adjusted, and this can be easily adjusted based on the level of the molten metal 5 in the crucible 1. At that time, inside the crucible? The amount of molten metal 5 and the remaining amount of solid and semi-molten material 8 in the furnace body 6 serve as cushions, and the adjustment is extremely easy.

〔Effect of the invention〕

In this invention, a pouring nozzle that can be opened and closed with a stopper is provided at the bottom of a crucible equipped with a heating coil for temperature raising on the outer periphery, and a gutter-shaped furnace body equipped with a heating coil for melting on the outer periphery is tilted. Since the bottom end of the crucible is opened at the top of the crucible, a constant flow of molten metal at a constant temperature drips into the crucible from the inclined furnace body, melting from cypress materials such as ingots. The effect is that a precise amount of molten metal can be poured continuously from a crucible at a temperature suitable for pouring, theoretically for an infinite amount of time, by cutting out small pieces.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the embodiment. 1... Crucible, 4,7.10... Heating coil, 6°11... Furnace body.

Claims (1)

[Claims] 1) A pouring nozzle that can be opened and closed with a stopper is provided at the bottom of the furnace of a crucible equipped with a heating coil for temperature raising on the outer periphery, and the gutter-shaped furnace body equipped with a heating coil for melting on the outer periphery is tilted. A continuous melting and pouring furnace characterized in that its lower end is opened at the upper part of the crucible.