JPH06218532A - Automatic continuous melting/casting apparatus - Google Patents

Abstract

PURPOSE:To efficiently obtain molten metal having good quality in good working environment by inserting a bar in the inner part of a stopper, cleaning a nozzle, connecting the inner part of a preheating device to the inner part of a melting furnace and holding these devices in the inert gas atmosphere. CONSTITUTION:A round bar of Al, etc., is charged into a heat resistant tube 2 of the preheating device 3. A preheating burner 7 and a heating burner 9 are ignited and the inert gas of argon gas, etc., is blown from a gas feeding pipe 20. When the preheating device 3 reaches a preset temp., a rotation driving source in the supplying device is automatically worked, and the material is charged into the melting furnace 13. A mold 21 is transported and when a temp. sensor 14 detects that the molten metal reaches the preset temp., a stopper 12 is raised and the molten metal is tapped off. when the tapping-off of the molten metal is completed, a cylinder 17 for vertical moving is worked and the bar 19 for inserting in the nozzle hole is vertically moved, and by removing the freign matter in the nozzle 18, the mixture of the foreign matter into the mold is prevented and also, the flow of the molten metal is smoothened. On the other hand, by command of a level sensor 16, the material in the preheating device 3 is charged into the melting furnace 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic continuous melting and casting apparatus suitable for melting and casting high purity metal.

[0002]

2. Description of the Related Art When casting various metals and alloys, the raw materials are first melted by heating in a cupola, induction furnace, electric resistance furnace, or combustion furnace using gas or heavy oil as fuel to adjust the components, deoxidize and degas. A general method is to perform a molten metal treatment such as an improvement treatment and a slag removal, and then transfer the material kept at an appropriate temperature to a ladle and inject it into a mold.

[0003]

Many problems remain in such a conventional dissolution method, and they are listed below. It takes a lot of time to dissolve and is inefficient. 2. Depending on the type of raw material, it is difficult to adjust the components and misadjustment is likely to occur. 3. Various molten metal treatments are generally time-consuming and easily cause processing defects. 4. The surroundings of the melting furnace are often extremely hot, and the working environment is generally unfavorable due to the presence of various odorous and toxic gases generated from combustion gases and molten metal treatment agents. 5. Entrapment of oxides due to oxidation during dissolution and component fluctuations due to combustion and volatilization of active ingredients are likely to occur. 6. Impurities from combustion gas, crucible, various refractories, processing equipment and ladle are often mixed. These are the major obstacles to improving and improving the casting quality and working environment, and the development of new technology has been strongly desired in the industry. The present invention is
It was made in view of the above-mentioned problems, and its purpose is to provide a stable molten metal of extremely good quality.
(EN) An automatic continuous melting and casting apparatus that can be obtained efficiently and under a good working environment.

[0004]

The present invention uses a rod-shaped or coil-shaped raw material produced in large quantities by continuous casting, extruding, drawing, etc., which has been subjected to a preliminary component adjustment, a molten metal treatment, and a shielding container filled with an inert gas. Among them, it relates to an automatic continuous melting and casting device that can melt a required amount in a short time by a heat source such as an induction coil and an electric discharge arc furnace, and immediately inject it into a mold without adjusting the components and treating the molten metal. is there. In manufacturing the raw materials used in this invention,
Since a large number of products with the same simple shape are manufactured, it is possible to manufacture them in a good working environment with a mass production method, unlike the process of manufacturing various general castings. It is not necessary to consider the derivation of such problems.

[0005]

An automatic continuous melting and casting apparatus according to the present invention comprises a feeding apparatus for feeding a material, a preheating apparatus for heating the material, and a melting apparatus for melting the material to keep it warm and to discharge hot water. , The preheating device is provided with a heating device, the melting device is provided with a heating device, a melting furnace provided with a stopper that is moved up and down by a lifting cylinder, a temperature sensor for detecting the temperature of the molten metal, and a level of the molten metal A level sensor is provided, and a nozzle hole passing bar connected to the upper and lower cylinders for cleaning the nozzle is inserted inside the stopper, and the inside of the preheating device and the inside of the melting furnace are continuously maintained in an inert gas atmosphere. It is characterized by that.

[0006]

Embodiments of the present invention will now be described in more detail with reference to the drawings. FIG. 1 is a side view of the feeding device, and FIG. 2 is a cross-sectional side view of the preheating device and the melting device. It has a supply device 1 for feeding a material that can be cut to an appropriate length, a preheating device 3 for heating a material to be loaded into the heat-resistant pipe 2, and a melting device 4 for melting the material to keep it warm and to discharge hot water. The supply device 1 includes an endless feeding chain 6 connected to a rotary drive source 5, the preheating device 3 includes a preheating burner 7 for heating and an exhaust port 8, and the melting device 4 includes a heating burner 9 A melting furnace 13 provided with an exhaust port 10 and provided with a stopper 12 that moves up and down by a lifting cylinder 11, a temperature sensor 14 for detecting the temperature of the molten metal, and a level sensor 16 for detecting the level of the molten metal 15 are provided. Inside the stopper 12, a nozzle hole passing bar 19 connected to the upper and lower cylinders 17 and for cleaning the nozzle 18 is inserted, and the inside of the preheating device 3 and the inside of the melting furnace 13 are continuously maintained in an inert gas atmosphere. In which was formed. Reference numeral 20 is a gas supply pipe for supplying an inert gas, 21 is a mold, and 22 is a carriage on which the mold 21 is placed.

Next, the operation of melting aluminum (hereinafter simply referred to as "Al") with the above structure and casting will be described. First, the rotary drive source 5 of the supply device 1 is operated and the aluminum rod is charged into the heat resistant tube 2 of the preheating device 3 by the feeding chain 6. Here, the preheating burner 7 and the heating burner 9 are ignited and the argon gas is blown from the gas feed pipe 20. When the preheating set temperature of the preheating device 3 reaches 500 to 700 ° C., the rotary drive source 5 of the supply device 1 automatically operates and 3
0 kg of material is sent out and put into the melting furnace 13.

When the temperature sensor 14 detects that the mold 21 placed on the carriage 22 has been fed and the melt has reached the set temperature of 750 to 800 ° C., the lift cylinder 1
1 operates and the stopper 12 rises to discharge hot water. The tapping speed is controlled in several stages. When the pouring of the set amount is completed, the stopper 12 descends and the tapping is completed. When the tapping is completed, the upper and lower cylinders 17 are operated and the nozzle hole passing bar 19 is moved up and down to clean the holes of the nozzle 18 to remove foreign substances and prevent the foreign substances from being mixed into the mold, and to smoothly flow the molten metal. To do. On the other hand, the rotation drive source 5 of the supply device 1 is operated by the command of the level sensor 16 that detects the level of the molten metal 15, and the material in the preheating device 3 is charged into the melting furnace 13. By repeating the above operation, continuous melting and casting are automatically performed.

In this embodiment, Al was used as the melting material, but it is not limited to this, and the same purpose can be achieved even if it is used for continuous melting and casting of various metals and alloys. . Further, in the present embodiment, the motor is used as the drive source of the supply device 1, but a reciprocating cylinder can be used, and the conveying means is not limited to the endless chain, and many known techniques can be used. Further, although a gas burner is used as the heating device, it is possible to use an electric heating means, and in this case, the exhaust port can be omitted.
Further, the energy discharged from the exhaust port 10 of the melting device 4 can be used as the preheating energy of the preheating device 3.

[0010]

As is apparent from the above description, the automatic continuous melting and casting apparatus of the present invention is capable of obtaining a stable and extremely good quality molten metal in an efficient and good working environment. It has many excellent effects industrially.

[Brief description of drawings]

FIG. 1 is a side view of a supply device.

FIG. 2 is a sectional side view of a preheating device and a melting device.

[Explanation of symbols]

 1 Supply Device 2 Heat-Resistant Pipe 3 Preheating Device 4 Melting Device 5 Rotational Drive Source 6 Feed Chain 7 Preheating Burner 8 Exhaust Port 9 Heating Burner 10 Exhaust Port 11 Elevating Cylinder 12 Stopper 13 Melting Furnace 14 Temperature Sensor 15 Melting Metal 16 Level Sensor 17 Up and Down Cylinder 18 Nozzle 19 Nozzle hole through bar 20 Gas feed pipe 21 Mold 22 Truck

Front page continued (72) Inventor Yasuhiro Utsu 35 Nagahamacho, Kanda-cho, Kyoto-gun, Fukuoka Prefecture Hitachi Metals Kyushu Engineering Co., Ltd.

Claims (1)

[Claims] 1. A supply device for feeding a material, a preheating device for heating the material, and a melting device for melting the material, keeping it warm, and discharging hot water. The preheating device includes a heating device, and the melting device is A melting furnace equipped with a heating device and equipped with a stopper that moves up and down by an elevating cylinder, a temperature sensor for detecting the temperature of the molten metal, and a level sensor for detecting the level of the molten metal, and the upper and lower cylinders inside the stopper. An automatic continuous melting and casting apparatus, characterized in that a nozzle hole passing bar for cleaning the nozzle connected to the above is inserted and the preheating device and the melting furnace are continuously maintained in an inert gas atmosphere.