JPH05277710A - Apparatus for automatically pouring molten metal in casting equipment - Google Patents

Abstract

PURPOSE:To control the quantity and the temp. of molten metal at high accuray at the time of pouring the molten metal by arranging a temp. raising furnace device, in which the molten metal from a ladle device is received to raise the temp. and also the prescribed quantity of the molten metal raising the temp. is charged and poured into a casting device. CONSTITUTION:The molten metal of prescribed temp. and quantity is poured into the ladle device 7 from a holding furnace 2. Successively, the prescribed quantity of the molten metal is poured into the temp. raising furance device 8 from the ladle device 7. In this temp. raising furnace device 8, the molten metal is raised to the temp. at the time of pouring and held. Successively, when the casting device 3 becomes the capable condition of pouring the molten metal, the prescribed quantity of the molten metal is poured into the casting device 3 from the temp. raising furnace device 8. Therefore, as the temp. raising furance device 8 is arranged between the ladle device 7 and the casting device 3, even in the case the pouring quantity according to kind of the product or the time from the holding furnace 2 to the pouring into the casting device 3, are changed, the temp. of the molten metal at the time of pouring is always kept to the constant. Therefore, the viscosity of the molten metal at the time of pouring becomes constant and the molten metal pouring quantity can accurately be controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic pouring device for casting equipment.

[0002]

2. Description of the Related Art A conventional pouring device has a ladle device that receives the molten metal from a holding furnace that holds the molten metal in a predetermined state and pours the molten metal into a casting machine in a predetermined amount. It was
To cast using this pouring device, first take out the molten metal from the holding furnace into the ladle, tilt the ladle with the tilting device provided in the ladle, and centrifugally cast a predetermined amount of the molten metal in the ladle. It was to pour the molten metal into a casting machine such as a machine.

[0003]

In order to manufacture a highly accurate casting product, it is important to control the temperature of the molten metal during pouring and the pouring amount with high accuracy during casting. For example, when a pipe material is cast using a centrifugal casting machine as a casting device, how the wall thickness of the pipe material is approximated to the product size depends on how accurately the pouring amount is controlled. That is, if the pouring amount is too large, the wall thickness becomes thicker, and machining is required in the subsequent process, resulting in deterioration of yield and increase in the number of processes. On the other hand, if the pouring amount is too small, the wall thickness becomes thin, resulting in a defective product.

In the above conventional pouring device, an operator manually operates the tilting device of the ladle device to pour a predetermined amount of molten metal from the ladle into the metal frame of the casting device. The operation of the tilting device has to be changed every time the type of product to be cast changes. Therefore, in the conventional pouring work, it is extremely difficult and precise to pour a predetermined amount of molten metal.

The temperature control at the time of pouring has an important relationship with the structure of the product and the cooling time after that, and is indispensable for obtaining a high quality product. Further, the temperature of the molten metal is related to the viscosity of the molten metal, and this viscosity is also related to the management of the pouring amount. That is, when the viscosity of the molten metal is large and when it is small, the amount of molten metal discharged differs even if the ladle tilt angle is the same. Therefore, temperature control of the molten metal during pouring is extremely important.

However, in the conventional method, the temperature control in the holding furnace is automatically performed, but there is a variation in the time from the exit of the holding furnace until the molten metal is poured into the casting apparatus. The temperature could not be controlled accurately. In addition, when pouring the molten metal in the ladle to the casting equipment, the entire molten metal may be poured into the casting equipment, or a part of it may be poured and the molten metal may remain in the ladle. The amount of molten metal in the ladle was not always constant. Therefore, when the molten metal is poured into the ladle from the holding furnace next time, the temperature of the molten metal in the ladle may change depending on the remaining amount, the elapsed time, and the amount and temperature of the poured molten metal. Therefore, it is extremely difficult to control the temperature of the molten metal in the ladle when pouring it into the casting device with high accuracy.

Therefore, an object of the present invention is to provide an automatic pouring device capable of controlling the amount of molten metal and its temperature during pouring with high accuracy.

[0008]

In order to achieve the above object, the present invention takes the following means. That is, the feature of the present invention is that a ladle device that receives a predetermined amount of molten metal from a holding furnace that holds the molten metal in a predetermined state and cuts out a predetermined amount of the received molten metal, and the molten metal from the ladle device And a temperature rising furnace apparatus for cutting out a predetermined amount of the heated molten metal and pouring the molten metal into a casting apparatus.

Further, according to the present invention, the temperature raising furnace device comprises a furnace body for storing and raising the temperature of the molten metal, a tilting device for tilting the furnace body to cut out the stored molten metal, and the tilting device. The control device controls the movement of the device, and the control device is configured to control the tilting speed so as to keep the flow rate of the molten metal for cutting out constant before the end of cutting.

[0010]

According to the present invention having the above-mentioned structure, the molten metal having a predetermined temperature and a predetermined amount is poured from the holding furnace to the ladle device. Next, a predetermined amount of molten metal is poured from the ladle device to the temperature raising furnace device.
In this temperature raising furnace apparatus, the molten metal is heated to and maintained at the temperature at which it was poured. Next, when the casting apparatus is ready for pouring, a predetermined amount of molten metal is poured into the casting apparatus from the temperature raising furnace apparatus.

According to the present invention, since the temperature raising furnace device is provided between the ladle device and the casting device, even if the pouring amount changes depending on the type of the product, the holding furnace pours the molten metal into the casting device. The temperature at the time of pouring the molten metal is always kept constant, even if the time until it changes is different. Therefore, the viscosity of the molten metal at the time of pouring becomes constant, and it becomes easy to accurately control the pouring amount.

Further, when the molten metal is cut out by the temperature raising furnace apparatus, the furnace body is tilted by a tilting device. A control device for controlling the tilting device controls the flow rate of the molten metal (per unit time) before the completion of cutting. Since the tilting speed is controlled so as to keep the amount) constant, the cutting flow rate becomes constant before the end of cutting. Therefore, it becomes easier to detect and confirm that the pouring amount has reached a predetermined amount, as compared with the case where the cutout flow rate changes with time, the pouring can be stopped immediately, and the pouring amount can be controlled accurately.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall structure of an automatic casting facility for manufacturing cast iron pipes used for drainage pipes and the like. FIG. 2 is a plan layout view thereof. In the figure, 1 is an automatic pouring device of the present invention, and the pouring device 1 is provided between an 80 ton holding furnace 2 and a casting device 3.

The 80-ton holding furnace 2 is a furnace for holding the molten metal, which is a casting material, in a predetermined state. The casting device 3
Consists of a triangular ladle 4, a spout 5 and a casting machine 6. The casting machine 6 is composed of a centrifugal casting machine, and casts cast iron pipes such as drainage pipes by centrifugal force. The molten metal is poured from the triangular ladle 4 through the spout 5 into the casting machine 6.

The automatic pouring device 1 has a ladle device 7 and a temperature raising furnace device 8. The ladle device 7 receives a predetermined amount of molten metal from the holding furnace 2 and cuts out a predetermined amount of the molten metal into a temperature raising furnace device 8. The 1 ton ladle 9 and the ladle 9 are tilted. It has a tilting device 10. This 1-ton ladle 9 can be moved by a crane or other moving device. The tilting device 10 is provided at a fixed position, and the 1-ton ladle 9 can be detachably mounted thereon. The tilting device 10 tilts the placed 1 ton ladle 9 with a hydraulic device 11 or the like so that the molten metal stored therein can be discharged. The tilting device 10 is provided with an encoder 12 that detects a tilting angle.

The temperature raising furnace device 8 receives the molten metal from the ladle device 7, raises and holds it at a predetermined temperature, and cuts out a predetermined amount of the molten metal into the triangular ladle 4. The temperature raising furnace device 8 includes a furnace body 13, a tilting device 14 for tilting the furnace body 13, a control device 15 for controlling the tilting device 14, and a weight of the molten metal stored in the furnace body 13. And a weighing device 16 for measuring.

The furnace body 13 is composed of a high-frequency furnace having a capacity of 150 kg, and a thyristor board 17 is connected to it.
The tilting device 14 of the furnace main body 13 is operated by a hydraulic device 18 to tilt the furnace main body 13 and discharge the molten metal stored therein to the triangular ladle 4. Furthermore, this tilting device 14 includes
An encoder 19 for detecting the tilt angle is provided.

The control unit 15 is a terminal unit including a central processing unit 20, a setting panel 21 installed on the machine side, a personal computer and the like.
22, a printer 23, a loader 24, and the like. The control device
Reference numeral 15 controls the tilting angle and the tilting speed of the tilting device 14 of the temperature raising furnace device 8, and the tilting device of the ladle device 8
10 is also configured to control. Furthermore, this control device
15 has various functions described below.

That is, the time when the molten metal is poured from the holding furnace 2 to the 1-ton ladle 9, the amount of molten metal (weight) at that time, and the temperature of the molten metal at that time are input, and It is configured to be stored in the central processing unit 20. These data are recorded by the setting panel 21. Further, from this setting board 21, the temperature raising target temperature in the temperature raising furnace device 8,
Also, data such as the amount of molten metal poured into the casting device 3 is centrally processed.
Input to 20.

The control device 15 is also configured to input and store the data of the weight of the molten metal in the furnace body 13 measured by the measuring device 16. Further, the central processing unit 20 of the control unit 15 has means 25 for predicting the temperature drop of the molten metal in the ladle 9, as shown in FIG. The temperature drop predicting means 25 measures the temperature of the molten metal poured into the 1-ton ladle 9, the weight of the molten metal at that time, and the time from when the molten metal is poured into the 1-ton ladle 9 until it is taken out to the temperature raising furnace body 13. The temperature when the molten metal is poured into the temperature raising furnace main body 13 is calculated by the calculation means from each data of the time and the temperature drop characteristic registered in advance.

The data of the temperature drop characteristics is 1 ton ladle
It is stored in the storage means for each temperature and weight of the molten metal in 9. Then, a desired pattern is calculated from the stored temperature pattern by weight proportional calculation using the weight as a parameter. Then, the calculation pattern is configured to display the temperature change on the time axis on the CRT screen of the terminal device 22. Further, a setting screen for registering / correcting the temperature drop characteristic data is provided, and the data maintenance can be performed from the terminal device 22.

Further, the central processing unit 20 has an electric power instructing means 26 to the heating furnace device. This power instruction means 26 is
The thyristor panel 17 of the temperature raising furnace device 8 is controlled based on the calculation of the power supply required to raise the temperature of the molten metal in the temperature raising furnace main body 13 to a predetermined temperature, the temperature raising time, etc. To do. That is, the electric power instructing means 26 calculates the electric power necessary for raising the temperature to the furnace body 13 from the predicted calculation value in the temperature drop predicting means 25, the molten metal amount put in the furnace body 13 and the target temperature. The calculation of electric power required for holding after reaching the target temperature is performed, and the input electric power command to the furnace main body 13 is given.

Further, the central processing unit 20 of the control device 15 is
As shown in FIG. 4, the heating furnace tilting device control means 27 is provided. The tilting device control means 27 performs tilting angle position control for taking out a certain amount of molten metal from the temperature raising furnace main body 12. That is, the control means 27 stores the data of the tilt angle-remaining hot water amount calculated in advance from the shape of the furnace body 13, calculates the necessary tilt angle from this data, and controls the tilt angular velocity. As a result, a constant pouring amount is obtained.

The calculation of the tilt angle is obtained from the residual hot water amount and the tilt angle pattern curve input in advance. That is, the amount of molten metal in the furnace body 13 is measured by the metering device 16 and the amount of molten metal required to cast the desired product is known. It is asked if it should be left in 13. When the amount of remaining hot water is obtained, how much the furnace body 13 should be tilted is obtained from the pattern curve.

The tilting angular velocity control is a control at what speed the furnace body 13 is tilted to the obtained tilting position. This speed control is performed by controlling the speed of the cylinder of the hydraulic device 18 of the tilting device 14. That is,
As shown by the APC (auto position control) curve, this speed control is initially moved at high speed and is switched to low speed movement when approaching a predetermined tilt angle position. Then, at this control end position, the speed is controlled so that the flow rate of the molten metal flow to be poured becomes constant. Then, whether or not a predetermined amount of molten metal has been poured is detected by a feedback signal from the measuring device 16, and when the predetermined amount of molten metal has been poured, tilting is stopped and the furnace body 13 is immediately returned to its original position. Return to.

The tilting control means 27 is similarly configured to control the hydraulic device 11 of the tilting device 10 of the ladle device 7. According to the embodiment of the present invention having the above configuration,
The target product type is input to the controller 15. The controller 15 stores various data in advance for each product, the amount of pouring and the pouring temperature necessary for casting are automatically set according to the type of the input product, and the terminal Displayed on the display screen of machine 22.

Based on these data, the operator cuts out a predetermined amount of molten metal from the 80-ton holding furnace 2 into a 1-ton ladle 9. At this time, the molten metal amount and the molten metal temperature are controlled by the control device.
Input to 15. Next, the 1-ton ladle 9 is moved to the 1-ton ladle tilting device 10 and placed on the tilting device 10. Then, the tilting device 10 is operated to incline the 1-ton ladle 9, and the molten metal in the ladle 9 is cut into the holding furnace body 13 by a predetermined amount.

At this time, in the control device 15, the temperature drop predicting means 25 and the electric power instructing means 26 operate to keep the temperature of the molten metal in the holding furnace main body 13 at a predetermined temperature. Next, the tilting device 14 of the temperature raising furnace device 8 is actuated to cut a predetermined amount of the molten metal in the furnace body 13, and the cut molten metal is a triangular ladle.
It is supplied to the casting machine 6 through the 4 and the spout 5 and cast into a predetermined product.

At this time, the tilting device 14 is controlled by the control device 15
As a result, speed control is performed, so that accurate pouring amount control is performed. The present invention is not limited to the above embodiment.

[0030]

According to the present invention, since the temperature raising furnace device is provided between the ladle device and the casting device, even if the pouring amount changes depending on the type of the product, the pouring from the holding furnace to the casting device is performed. The temperature at the time of pouring is always kept constant even if the time until the water is poured varies.

Therefore, the viscosity of the molten metal at the time of pouring becomes constant, and it becomes easy to accurately control the pouring amount. Further, since the tilting device of the temperature raising furnace device is controlled by the control device, it is possible to accurately control the pouring amount.

[Brief description of drawings]

FIG. 1 is a layout view of casting equipment showing an embodiment of the present invention.

FIG. 2 is a plan layout view of the casting equipment of FIG.

FIG. 3 is a conceptual diagram of temperature drop prediction means.

FIG. 4 is a conceptual diagram of a heating furnace tilting device control means.

[Explanation of symbols]

 1 Automatic pouring device 2 Holding furnace 3 Casting device 7 Ladle device 8 Temperature rising furnace device 13 Furnace body 14 Tilt device 15 Control device

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kozo Taniguchi 7-22, Minamionkajima, Taisho-ku, Osaka City, Osaka Prefecture Kubota Enkajima Plant (72) Inventor Enao et al. Tanabe, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Nitta No. 1-1 Fuji Electric Co., Ltd. (72) Inventor Toshiyuki Kano No. 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd.

Claims (2)

[Claims] 1. A ladle device that receives a predetermined amount of molten metal from a holding furnace that holds the molten metal in a predetermined state and cuts out a predetermined amount of the received molten metal, and receives the molten metal from the ladle device and raises the temperature. An automatic pouring device in a casting facility, further comprising: a heating furnace device for cutting out a predetermined amount of the heated molten metal and pouring the molten metal into a casting device. 2. The automatic pouring device according to claim 1, wherein the temperature raising furnace device is a furnace body that stores the molten metal and raises the temperature, and a tilting device that tilts the furnace body to cut out the stored molten metal. And a control device for controlling the movement of the tilting device,
The automatic pouring device in a casting facility, wherein the control device is configured to control the tilting speed so as to keep the flow rate of the molten metal for cutting constant before the completion of the cutting.