阅读说明：本技术 铸钢铸造物制造系统 (Cast steel casting manufacturing system ) 是由 西田理 保裕之 兵藤利幸 于 2019-06-28 设计创作，主要内容包括：本发明提供一种适于通过比较简单的设备,连续且大量地制造小型的铸钢铸造物的铸钢铸造物制造系统。铸钢铸造物制造系统(1)具备：多个炉(10),存积铸钢用熔融金属,并排列为一列；浇注机(20),具有从炉(10)接受熔融金属的浇包(30),该浇注机向与多个炉(10)排列的列平行的方向移动,使浇包(30)倾动,由此将熔融金属浇注于铸模(70)；以及铸模输送线(60),间歇地输送与浇注机(20)移动的方向平行地排列的多个铸模(70),隔着浇注机(20)而配设于与炉(10)相反的一侧,该铸钢铸造物制造系统(1)进一步具有测定浇包(30)内的熔融金属的温度的温度传感器(38),在测定出的温度低于规定的温度时产生警报。(The invention provides a cast steel casting manufacturing system which is suitable for continuously manufacturing a large amount of small cast steel castings through relatively simple equipment. A cast steel casting manufacturing system (1) is provided with: a plurality of furnaces (10) for storing molten metal for casting steel and arranged in a row; a pouring machine (20) having a ladle (30) that receives molten metal from the furnaces (10), and that moves in a direction parallel to the row in which the plurality of furnaces (10) are arranged, and pours the molten metal into the mold (70) by tilting the ladle (30); and a mold transfer line (60) for intermittently transferring a plurality of molds (70) arranged in parallel to the direction in which the casting machine (20) moves, the mold transfer line being disposed on the opposite side of the furnace (10) with the casting machine (20) therebetween, wherein the cast steel casting manufacturing system (1) further comprises a temperature sensor (38) for measuring the temperature of the molten metal in the ladle (30), and generates an alarm when the measured temperature is lower than a predetermined temperature.)

1. A cast steel casting manufacturing system is characterized by comprising:

a plurality of furnaces for storing molten metal for casting steel and arranged in a row;

a pouring machine having a ladle that receives the molten metal from the furnaces, the pouring machine moving in a direction parallel to the row in which the plurality of furnaces are arranged, and pouring the molten metal into a mold by tilting the ladle; and

a mold conveying line for intermittently conveying a plurality of molds arranged in parallel to a direction in which the casting machine moves, the mold conveying line being disposed on a side opposite to the furnace with the casting machine interposed therebetween,

the cast steel casting manufacturing system further has a temperature sensor that measures the temperature of the molten metal in the ladle,

an alarm is generated when the measured temperature is below a prescribed temperature.

2. The cast steel casting manufacturing system of claim 1,

when the alarm is given, the pouring is stopped and the molten steel is reheated.

3. The cast steel casting manufacturing system of claim 1 or 2,

the casting machine includes a ladle moving device for moving the ladle to the furnace side and the mold side.

4. The cast steel casting manufacturing system of claim 3,

the ladle moving device is a roller conveyor that moves the ladle from a molten metal receiving position where the molten metal is received from the furnace to a pouring position where the molten metal is poured into the casting mold.

5. The cast steel casting manufacturing system of claim 4,

the casting machine has: a movable trolley for moving the casting machine; a lifting device for lifting the roller conveyor; a forward and backward moving device for moving the roller conveyor in the direction of the molten metal receiving position and the pouring position; and a tilting device for tilting the roller conveyor and pouring from the ladle.

6. The cast steel casting manufacturing system of claim 1 or 2,

the casting machine has a cover mounting device for covering the ladle with a cover and removing the covered cover.

7. The cast steel casting manufacturing system of claim 5,

the casting machine has a cover mounting device for covering the ladle with a cover and removing the covered cover.

8. The cast steel casting manufacturing system of claim 1 or 2,

the mold is a mold with a molding box, a through hole is formed in the molding box,

the cast steel casting manufacturing system further includes a decompression device that has a plurality of connection ports connected to the through-holes along the mold transfer line, and that connects the connection ports to the through-holes of the molding boxes of the cast molds to decompress the molds.

9. The cast steel casting manufacturing system of claim 7,

the mold is a mold with a molding box, a through hole is formed in the molding box,

the cast steel casting manufacturing system further includes a decompression device that has a plurality of connection ports connected to the through-holes along the mold transfer line, and that connects the connection ports to the through-holes of the molding boxes of the cast molds to decompress the molds.

10. The cast steel casting manufacturing system of claim 1 or 2,

further comprises an oxidation preventing gas supply device for filling the ladle with oxidation preventing gas.

11. The cast steel casting manufacturing system of claim 9,

further comprises an oxidation preventing gas supply device for filling the ladle with oxidation preventing gas.

12. The cast steel casting manufacturing system of claim 10,

the ladle has a layer of porous refractory material between the sheet iron and the refractory material.

13. The cast steel casting manufacturing system of claim 11,

the ladle has a layer of porous refractory material between the sheet iron and the refractory material.

Technical Field

The present invention relates to a cast steel casting manufacturing system for casting a cast steel casting.

Background

There is known a casting manufacturing apparatus in which a molten metal is transferred from a furnace to a treatment ladle, an alloy material and the molten metal are reacted in the treatment ladle, the reacted molten metal is transferred to a casting ladle, and a casting machine pours the molten metal from the casting ladle to a mold on a casting line (see, for example, patent document 1).

On the other hand, cast steel castings produced by pouring molten metal into a mold in the same manner as the castings are known, but have a lower carbon content than the castings and excellent strength. Cast steel castings have a carbon content of 2% or less, and are distinguished from so-called castings (also called cast irons) that generally have a carbon content of 2.5 to 4.5%. Compared with cast iron, cast steel has superior characteristics of uniform structure, high strength, uniform quality and the like.

However, cast steel castings have disadvantages that melting and casting temperatures are high, and fluidity is largely reduced by lowering the temperature. Therefore, it takes time to melt in a melting furnace, and in order to pour a high-temperature molten metal into a mold at once, it has been used mainly for large-sized products having a simple shape such as a screw.

In recent years, there has been an increasing demand for cast steel products to be applied to small and complex shapes. Therefore, a method has been proposed in which a porous portion is provided in a breathable mold, and a molten metal is poured from a tundish by reducing the pressure (see patent document 2). However, it is not suitable for producing large quantities of small cast steel castings continuously by using consumable sand molds or the like solidified by gas as the outlet of the molten metal at the bottom of the tundish.

In order to overcome the above-described drawbacks of cast steel castings, an invention has also been proposed in which a furnace body having a heat source is used instead of a ladle (see, for example, patent document 3). The casting temperature can be increased by casting from the furnace, but the equipment becomes complicated and the cost is also increased.

Patent document 1: japanese patent No. 5934451

Patent document 2: japanese laid-open patent publication No. 8-290254

Patent document 3: japanese patent No. 5492129

Disclosure of Invention

Accordingly, an object of the present invention is to provide a cast steel casting production system suitable for continuously producing large quantities of small cast steel castings by relatively simple facilities.

In order to solve the above problems, a cast steel casting production system 1 according to embodiment 1 of the present invention includes, for example, as shown in fig. 1 and 2: a plurality of furnaces 10 for storing molten metal for casting steel and arranged in a row; a pouring machine 20 having a ladle 30 receiving the molten metal from the furnaces 10, the pouring machine moving in a direction parallel to the row in which the plurality of furnaces 10 are arranged, and pouring the molten metal into the mold 70 by tilting the ladle 30; and a mold transfer line 60 for intermittently transferring a plurality of molds 70 arranged in parallel to the direction in which the casting machine 20 moves, and disposed on the opposite side of the furnace 10 with the casting machine 20 interposed therebetween, and the cast steel casting manufacturing system 1 further includes a temperature sensor 38 for measuring the temperature of the molten metal in the ladle 30, and generates an alarm when the measured temperature is lower than a predetermined temperature.

With this configuration, the pouring machine moves in parallel to the plurality of furnaces arranged in a row, and can receive the molten metal from the plurality of furnaces, so that the molten metal can be appropriately supplied to the ladle even if it takes time to melt the molten metal for cast steel. Further, since the molten metal is received by the ladle of the pouring machine and poured into the mold of the mold transfer line parallel to the furnace on the opposite side across the pouring machine, pouring can be performed immediately after the molten metal is received by the ladle. That is, since the casting can be performed before the temperature of the molten metal for cast steel is substantially reduced, the cast steel is not affected by the reduction in fluidity due to the reduction in temperature. Further, since the temperature of the molten metal in the ladle is measured and an alarm is generated when the temperature is lower than a predetermined temperature, it is possible to prevent a cast steel having defects from being produced by pouring the molten metal whose fluidity has been reduced by the temperature reduction.

The cast steel casting manufacturing system 1 according to the 2 nd aspect of the present invention is configured to stop pouring and to reheat to melt when an alarm is issued. With this configuration, the molten metal having a reduced temperature is not poured into the mold, and the molten metal is not wasted.

In the cast steel casting production system 1 according to embodiment 3 of the present invention, the casting machine 20 includes a ladle moving device 40 that moves the ladle 30 toward the furnace 10 and the mold 70, as shown in fig. 5, for example. With this configuration, the molten metal is transferred from the furnace to the ladle by the pouring machine, and the molten metal can be poured into the mold by moving the ladle by the ladle moving device.

In the cast steel casting production system 1 according to the 4 th aspect of the present invention, the ladle moving device is a roller conveyor 40 that moves the ladle 30 from a molten metal receiving position that receives molten metal from the furnace 10 to a pouring position that pours the molten metal into the mold 70, as shown in fig. 5 and 6, for example. With this configuration, the ladle can be moved from the molten metal receiving position to the pouring position by the roller conveyor, and therefore the ladle can be moved quickly by relatively simple equipment.

In the cast-steel casting production system 1 according to the 5 th aspect of the present invention, for example, as shown in fig. 7, the casting machine 20 includes: a movable carriage 22 for moving the casting machine 20; an elevating device 46 for elevating the roller conveyor 40; a forward and backward moving device 48 for moving the roller conveyor 40 in the direction of the molten metal receiving position and the pouring position; and a tilting device 42 for tilting the roller conveyor 40 and pouring from the ladle 30. With this configuration, the molten metal can be transferred from the plurality of furnaces to the ladle, moved to the front of the casting mold where casting is performed, and the ladle can be simultaneously controlled to perform 3 operations of lifting, forward and backward movement, and tilting by the lifting device, the forward and backward movement device, and the tilting device via the roller conveyor, thereby performing casting while maintaining the position of the ladle at a position suitable for casting.

In the cast steel casting production system 1 according to the 6 th aspect of the present invention, the casting machine 20 includes a lid attachment device 50 that covers the ladle 30 with the lid 52 and removes the covered lid 52, as shown in fig. 5, for example. With this configuration, the cover can be covered on the ladle that receives the molten metal, and the cover can be removed when receiving the molten metal, so that the temperature of the molten metal can be prevented from being lowered by the flow of air in the ladle.

As shown in fig. 4, for example, in the cast-steel casting production system 2 according to the 7 th aspect of the present invention, the mold 70 is a flask-attached mold, the flask 72 has a through hole 74, and the cast-steel casting production system 2 further includes a pressure reducing device 80 having a plurality of connecting ports 82 connected to the through hole 74 along the mold line 60, the connecting ports 82 being connected to the through hole 74 of the flask 72 of the cast mold 70 to be poured, and the mold 70 is reduced in pressure. With this configuration, the mold of the mold transfer line can be poured in a reduced-pressure manner by the pressure reducing device, and therefore the molten metal can be poured quickly.

The cast steel casting production system 1 according to the 8 th aspect of the present invention further includes an oxidation preventing gas supply device 90 for filling the ladle 30 with an oxidation preventing gas, as shown in fig. 8, for example. With this configuration, since the ladle can be filled with the oxidation-preventing gas, oxidation of the high-temperature molten steel for casting can be prevented.

In the cast-steel casting production system 1 according to the 9 th aspect of the present invention, the ladle 30 has a layer of porous refractory 34 between the shell 32 and the refractory 36, as shown in fig. 8, for example. With this configuration, since the oxidation-preventing gas is filled into the ladle through the porous refractory, oxidation of the high-temperature molten steel for casting can be prevented.

According to the present invention, since molten metal can be appropriately supplied to a ladle and pouring can be performed immediately after the molten metal is received by the ladle, a drop in the temperature of the molten metal can be prevented, and further, since molten metal having reduced fluidity due to a drop in temperature can be prevented from being poured, a cast steel casting manufacturing system suitable for continuously and quantitatively manufacturing small cast steel castings by relatively simple equipment can be provided.

Drawings

Fig. 1 is a plan view of a cast steel casting manufacturing system according to an embodiment of the present invention.

Fig. 2 is a front view of the cast steel casting manufacturing system shown in fig. 1. In addition, a part of the mold conveying line is omitted.

Fig. 3 is a plan view of a cast steel casting production system according to an embodiment different from the embodiment shown in fig. 1.

Fig. 4 is an enlarged side view showing the mold and the pressure reducing device.

FIG. 5 is a side view of the furnace, the caster, and the mold delivery line showing the ladle receiving molten metal from the furnace.

Fig. 6 is a side view of the furnace, the casting machine, and the mold transfer line, showing when casting is performed from the ladle to the mold.

Fig. 7 is an enlarged front view showing the casting machine.

FIG. 8 is a schematic view of a ladle and an anti-oxidizing gas supply apparatus.

Description of the figures

Hereinafter, main reference numerals used in the present specification and drawings are listed.

1. 2 … cast steel casting manufacturing system; 10 … furnace (melter); 20 … casting machine; 22 … moving trolley; 24 … control panel; 28 … guide rails; 30 … casting ladle; 31 … solution outlet; 32 … iron sheet; 34 … layer of porous refractory material; 36 … (conventional) refractory; 38 … temperature sensor; 39 … temperature sensor arm; 40 … roller conveyor (ladle moving device); 42 … tilting device; 46 … lifting device; 48 … fore-and-aft movement means; 50 … cover mounting means; a 52 … cover; 54 … (of the lid); 56 … dividing the board; 60 … mold transfer lines; a 62 … pusher; a 64 … buffer; 66 … dolly; 70 … casting mould; 72 … model box; 74 … through holes; 80 … pressure relief device; 82 … connection port; 84 … pressure reducing piping; a 86 … pressure reducing valve (opening and closing valve); 88 … decompressor cylinder; 90 … means for supplying anti-oxidizing gas; 92 … anti-oxidation gas bottle; 93 … solenoid valve; 94 … flow regulating valve; 95 … buffer tank; 96 … pressure sensor; 97 … oxidation preventing gas supply port; 98 … piping for oxidation-preventing gas; m … molten metal; v … prevents the oxidizing gas from being trapped in the part.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding devices are denoted by the same reference numerals, and redundant description thereof is omitted. In the drawings, parts are omitted for clarity of explanation. First, the structure of a cast steel casting production system 1 will be described with reference to fig. 1 and 2. Fig. 1 is a plan view showing a furnace 10, a casting machine 20, and a mold line 60 in the vicinity thereof in a cast steel casting production system 1, and fig. 2 is a front view of the cast steel casting production system 1 shown in fig. 1, with the cast steel casting production system 1 partially omitted, and is depicted so that the furnace 10 and the casting machine 20 can be seen.

The cast steel casting production system 1 includes a plurality of furnaces 10 that melt and accumulate molten metal for cast steel. In fig. 1, 2 melting furnaces 10 are shown, but 3 or more melting furnaces 10 may be provided. Since the cast steel solidifies at 1540 ℃, the molten metal for cast steel is melted in the furnace 10 and maintained at 1600 ℃ or higher. Further, when the melting furnace 10 is formed to be large, it takes time to melt, and therefore, a relatively small melting furnace 10 is used. Since it takes time to reach a high temperature, the cast steel casting production system 1 includes a plurality of furnaces 10. A plurality of furnaces 10 are arranged in a line. The molten metal for casting steel is poured from the melting furnace 10 into the ladle 30 of the pouring machine 20 by tilting the melting furnace 10.

The cast steel casting production system 1 includes a casting machine 20 having a ladle 30. The casting machine 20 has a traveling carriage 22 that travels on rails 28. The rails 28 run parallel to the furnaces 10 arranged in a row. The moving carriage 22 moves on the guide rail 28, whereby the molten metal for casting can be transferred from an appropriate one of the plurality of melting furnaces 10 to the ladle. That is, the melting furnace 10 in which the molten metal for cast steel is melted at a high temperature can be selected and the molten metal can be transferred. As will be described later, the pouring machine 20 can pour the ladle 30 into the mold 70 by tilting the ladle by the tilting device 42.

The cast steel casting manufacturing system 1 includes a mold transfer line 60 that intermittently transfers a plurality of molds 70. Basically, the mold conveying line 60 is arranged in parallel to the direction in which the casting machine 20 moves, that is, in parallel to the plurality of furnaces 10 arranged in a row. Here, "basically" is because, as shown in fig. 1, the mold conveying line 60 includes a plurality of parallel rows in which a plurality of molds 70 are arranged, and also includes a transfer table 66 for moving the molds 70 between the plurality of rows. In the mold conveying line 60, a pusher 62 and a buffer 64 are provided at an end portion where a plurality of molds 70 are arranged in a row. The mold 70 is pushed out by a length of 1 mold size by the pusher 62, and the conveyed mold 70 is pressed by the buffer 64, so that the mold 70 is stably conveyed. In fig. 1 and 2, only a mold conveying line 60 is shown in a portion close to the furnace 10 and the casting machine 20, and the pusher 62 are provided at opposite end portions to the pusher 62 and the pusher 64 shown in the figure, and a transfer table 66 and a mold take-out device (not shown) for moving the molds 70 at the end portion of one row to the adjacent row are provided. In the figure, the molds 70 are shown in 2 rows, but may be 3 rows or more. The mold 70 may or may not be provided with a molding box.

The cast steel casting production system 1 includes a temperature sensor 38 that measures the temperature of the molten steel for cast steel in the ladle 30. Typically, the temperature sensor 38 is a non-contact temperature sensor using radiation such as infrared rays, and measures the temperature of the liquid surface (in the case where a lid 52 described later is attached, a pouring portion without the lid 52) in the ladle 30. The temperature sensor 38 may be an optical fiber type two-color thermometer measuring unit. The temperature sensor 38 is supported by a temperature sensor arm 39 so that the temperature measurement position changes in accordance with the movement of the ladle 30. The measured temperature is transmitted to a control device (not shown) for controlling the operation of the cast steel casting production systems 1 and 2 via a temperature cable. Here, the control device may be a control device (for example, the control panel 24 of the casting machine 20) that controls not only the operation of the cast steel production systems 1 and 2 but also the operation of another system, and may be provided separately from the cast steel production systems 1 and 2. Alternatively, the information may be transmitted to the control device via another device such as the control panel 24 of the casting machine 20. The measured temperature may be transmitted via other lines or wirelessly, not via a temperature cable.

According to the cast steel casting manufacturing system 1 configured as described above, since the mold 70 is arranged in parallel to the direction in which the casting machine 20 moves by the mold transfer line 60, casting can be performed to the mold 70 in order from the casting machine 20. In addition, when it takes more time to convey the mold 70 than to perform pouring, pouring can be performed while moving the pouring machine 20. In the cast steel casting production system 1, a plurality of furnaces 10 and mold lines 60 are provided with a pouring machine 20 interposed therebetween, and the molten metal can be received in the ladle 30 and then poured into the mold 70 while moving the ladle in the shortest distance, that is, in a short time.

Since the molten metal for cast steel can be poured from the melting furnace 10 into the mold 70 quickly, the temperature drop of the molten metal for cast steel is small, the reduction of the fluidity is small, and casting can be performed even in a small-sized mold 70. Since the molten metal for casting steel is stored in the plurality of melting furnaces 10, the ladle 30 can appropriately receive the molten metal from the melting furnaces 10. Further, since the casting machine 20 that has handed over the molten metal to the ladle 30 can perform casting to the molds 70 arranged on the opposite side of the furnace 10 so as to tilt the ladle 30 and the casting machine 20 can move along the mold transfer line 60, it is possible to perform casting to a large number of molds 70, and it is also suitable for manufacturing cast steel castings in large quantities. Further, since the temperature of the molten metal for cast steel is measured and transmitted to the control device, when the temperature of the molten metal for cast steel becomes lower than a predetermined temperature, an alarm is issued, and it is possible to prevent the molten metal for cast steel from being poured, which has reduced fluidity due to a reduction in temperature, and to produce a defective cast steel.

Fig. 3 is a plan view of a cast steel casting production system 2 provided with a pressure reducing device 80 for improving the molten metal casting. As in fig. 1, a furnace 10, a casting machine 20, and a mold line 60 in the vicinity thereof in a cast steel casting production system 1 are shown. The cast steel casting production system 2 differs from the cast steel casting production system 1 only in that the decompression device 80 is provided, and therefore, redundant description is omitted, and only the decompression device 80 will be described here.

Fig. 4 shows the pressure reducing device 80 in an enlarged manner. The decompression device 80 is a device for decompressing the mold 70. Here, the mold 70 is a mold with a molding box 72. The molding box 72 has a through hole 74. The decompression device 80 includes a plurality of connecting ports 82 connected to the through holes 74, and the molds 70 arranged adjacent to the casting machine 20 along the mold conveying line 60. The connection port 82 is connected to the through hole 74 of the flask 72 by moving forward through the decompressor cylinder 88 when decompressing the mold 70. The pressure reducing device 80 includes a pressure reducing pipe 84 that communicates with a pressure reducing source, such as a vacuum pump, not shown. The pressure reducing device 80 may be reduced in pressure during the pouring process, and may not be reduced in pressure during the mold transfer process of the mold 70 on the mold transfer line 60. The pressure reducing device 80 includes a pressure reducing valve 86 as an on-off valve, and can quickly switch the connection port 82 for reducing pressure. When the pressure reducing valve 86 is opened, the pressure reducing cylinder 88 is extended to press the connection port 82 against the through hole 74, and the mold 70 is sucked and reduced in pressure by the pressure reducing pipe 84. A seal head (not shown) biased to a closed state by a spring is provided at the connection port 82, and when the decompression cylinder 88 contracts, the connection port 82 is sealed. Since a technique for reducing the pressure of the mold 70 is well known, a detailed description thereof will be omitted here.

The mold 70 is depressurized, and thereby molten steel for casting, which is poured from the ladle 30 into a gate (not shown) of the mold 70, is quickly and reliably cast. Namely, the molten metal casting becomes good. In particular, in the cast steel casting production system 2, since the plurality of connecting ports 82 are provided, and are rapidly connected to the mold 70 that is depressurized, and the mold 70 that is poured is depressurized by depressurizing the pressure reducing valve 86, the mold 70 can be depressurized in response to rapid pouring from the pouring machine 20. In the decompression of the mold 70, the decompression is performed during pouring into the mold 70, whereby the insufficient pouring of the molten metal can be prevented. In addition, the mold 70 is depressurized, thereby preventing gas defects.

Next, the casting machine 20 of the cast steel casting production systems 1 and 2 will be described in detail with reference to fig. 5, 6, and 7. In fig. 5 and 6, the casting machine 20 of the cast steel casting production system 2 including the decompression device 80 is shown, but as described above, the casting machine 20 is the same in the cast steel casting production system 1. In the casting machine 20, the ladle 30 is placed on a roller conveyor 40 as a ladle moving device. The roller conveyor 40 moves the ladle 30 between a molten metal receiving position (see fig. 5) for receiving the molten metal from the melting furnace 10 and a pouring position (see fig. 6) for pouring the molten metal into the mold 70. The device for moving the ladle 30 to the furnace 10 side and the mold 70 side may be a known device other than the roller conveyor 40, such as a rail and a carriage. When receiving the molten metal from the furnace 10, the ladle 30 is moved to the furnace 10 side by the roller conveyor 40, and when performing casting, the ladle 30 is moved to the mold 70 side by the roller conveyor 40, whereby the ladle 30 can be quickly moved.

In the casting machine 20, the roller conveyor 40 is tilted by the tilting device 42 (see fig. 7). The tilting device 42 may have the same configuration as a known tilting device for tilting a ladle, but differs from the tilting device in that the roller conveyor 40 is tilted. In the cast steel casting production systems 1 and 2, as described later, if the ladle 30 is small and light, it is also easy to tilt together with the roller conveyor 40. The 3 operations of tilting, lifting and forward-backward movement of the ladle 30 are controlled simultaneously by the tilting device 42, the lifting device 46 and the forward-backward movement device 48, and tilting and pouring are performed around the solution outlet 31 of the ladle 30. The casting machine 20 further includes a lid attachment device 50 that removes the lid 52 from the ladle 30 when receiving the molten metal, and attaches the lid 52 after receiving the molten metal. For example, the cap attaching device 50 may be a cylinder having a claw that engages with a hanger 54 (described later) of the cap 52, or may be a cylinder suspended from above the ladle 30. In a state where the cylinder is extended and the claws are lowered, the ladle 30 is moved by the roller conveyor 40 directly below the lid attachment device 50, whereby the claws engage with the hangers 54 of the lid 52, and thereafter the cylinder is contracted, whereby the lid 52 is picked up and removed from the ladle 30. Conversely, the cylinder is extended to cover the ladle 30 with the lid 52, and the ladle 30 is moved by the roller conveyor 40 from directly below the lid attachment device 50, whereby the state in which the lid 52 is covered on the ladle 30 can be maintained. The cover 52 may be attached and detached by other known methods. By covering the ladle 30 with the cover 52, it is possible to suppress a decrease in the temperature of the molten steel for casting stored in the ladle 30.

In the casting machine 20, the tilting device 42, the lifting device 46, and the forward-backward moving device 48 control 3 operations of tilting, lifting, and forward-backward moving of the ladle 30 at the same time, and perform tilting and casting around the solution outlet 31 of the ladle 30, whereby the pouring position can be maintained at a constant position regardless of the remaining amount of the molten metal for cast steel in the ladle 30, that is, regardless of the inclination of the ladle 30. Since the position of the molten metal for cast steel that flows out from the ladle 30 is kept constant, the position of the molten metal for cast steel that flows into the mold 70 from the ladle 30 can be kept constant, and appropriate pouring control can be performed, and a predetermined amount of molten metal for cast steel can be reliably poured. Since the ladle 30 is moved up and down together with the roller conveyor 40 and the tilting device 42 to approach the mold 70 or move away from the mold 70, it is possible to perform casting in a short time after receiving the molten metal without requiring a time for transferring the ladle 30 from the roller conveyor 40 to the tilting device 42.

Next, the ladle 30 will be described in detail with reference to fig. 8. The ladle 30 is attached with a refractory 36 on the inside of a steel shell 32 as an outer vessel. The refractory 36 is made of known materials such as refractory bricks, borax, and a ramming material, and is similar to the refractory of a conventional cast iron ladle. In the ladle 30, a layer 34 of porous refractory material is formed between the iron sheet 32 and the refractory material 36. The layer 34 of the porous refractory material is formed of, for example, wet felt, but the material is not particularly limited. A through hole is formed in the side surface of the ladle 30, and an oxidation preventing gas supply port 97 of the oxidation preventing gas supply device 90 is connected thereto. The porous refractory 34 is filled with the oxidation preventing gas from the oxidation preventing gas supply port 97 into the ladle 30. That is, the oxidation preventing gas enclosing portion V is filled with the oxidation preventing gas. The oxidation preventing gas may be inert gas such as nitrogen gas, or may be other gas as long as it prevents oxidation of the high-temperature molten steel M for cast steel. The oxidation of the high-temperature molten steel M for casting can be prevented by filling the ladle 30 with the oxidation preventing gas.

The oxidation preventing gas supply device 90 is a device for supplying oxidation preventing gas into the ladle 30. The oxidation preventing gas supply device 90 includes an oxidation preventing gas bottle 92, an oxidation preventing gas supply port 97, and an oxidation preventing gas pipe 98 connecting the oxidation preventing gas bottle 92 and the oxidation preventing gas supply port 97. The oxidation preventing gas pipe 98 is provided with a solenoid valve 93, a flow rate adjusting valve 94, a buffer tank 95, and a pressure sensor 96. The electromagnetic valve 93 is a valve for cutting off the connection between the oxidation preventing gas bottle 92 and the ladle 30 when the oxidation preventing gas supply device 90 is stopped or when there is an abnormality. The flow rate adjustment valve 94 is a valve that adjusts the supply amount of the oxidation preventing gas based on the pressure measured by the pressure sensor 96. The buffer tank 95 is a tank for suppressing a sudden change in the pressure of the oxidation-preventing gas, i.e., the pressure in the ladle 30. The pressure sensor 96 measures the sealing pressure of the oxidation preventing gas. By measuring the sealing pressure, it is possible to adjust the amount of the oxidation preventing gas supplied, and to detect, for example, a case where the refractory 36 is broken and the oxidation preventing gas is injected into the molten metal M for cast steel, and a case where the oxidation preventing gas sealing portion V is not sealed by the lid 52. The oxidation preventing gas supply device 90 is typically provided in the casting machine 20 (see fig. 1 and 3), but may be provided in another place.

A cover 52 covers the ladle 30. The cover 52 is provided with a hanger 54 for removing and covering the cover 52 by the cover attachment device 50 (see fig. 5 and 6). Further, a partition plate 56 for partitioning the oxidation-preventing gas-sealed portion V in the ladle 30, that is, a partition plate 56 which is not communicated with the pouring portion of the ladle 30 is provided. The partition plate 56 extends from the lid 52 into the molten metal M in the ladle 30, and the oxidation-preventing gas-sealed portion V is surrounded by the ladle 30, the lid 52, the partition plate 56, and the molten metal M for cast steel.

Next, the operation of the cast steel casting production systems 1 and 2 will be described. The operation operations described below may be performed simultaneously if possible. The casting machine 20 moves to a place before the molten steel for casting becomes a sufficiently high temperature in the melting furnace 10 among the plurality of melting furnaces 10 arranged in a row. In this way, the pouring machine 20 can be moved to and receive the molten metal before the melting furnace 10 in which the preparation of the molten metal for casting steel is completed, and therefore, the pouring machine is efficient. The casting machine 20 moves the ladle 30 to a molten metal receiving position (see fig. 5) by the roller conveyor 40, and removes the lid 52 from the ladle 30 by the lid attaching device 50. The ladle 30 can be moved to a position where it is easy to receive molten metal by the elevating device 46 and the forward/backward moving device 48, and can also be moved to a position where molten metal for casting is poured together with the inclination of the melting furnace 10. The melting furnace 10 is tilted to pour a predetermined amount of molten steel for casting into the ladle 30. The ladle 30 is preferably a small-sized apparatus that stores about 200kg to 500kg of molten steel for casting. The molten metal for cast steel that has received the molten metal through the small ladle 30 can be poured into the mold 70 in a short time, that is, in a process in which the temperature of the molten metal for cast steel does not decrease, and can be completed.

When the molten steel for casting is transferred to the ladle 30, the lid 52 is attached to the ladle 30 by the lid attachment device 50. If the lid 52 is attached to the ladle 30, the ladle 30 may be filled with the oxidation preventing gas by the oxidation preventing gas supply device 90. The oxidation of the molten steel for casting in the ladle 30 is prevented by the oxidation-preventing gas. Since the layer of the porous refractory material 34 is formed in the ladle 30, the ladle 30 is easily filled with the oxidation preventing gas. Further, the steel may not be filled with the anti-oxidizing gas depending on the type of the cast steel, the temperature, the time required for pouring the received molten steel for casting, and the like. Thereafter, the temperature sensor 38 periodically measures the temperature of the molten metal for casting, and transmits temperature information to a control device (not shown). The ladle 30 is moved to the pouring position (see fig. 6) by the roller conveyor 40. The casting machine 20 moves in front of the casting mold 70 where casting is performed.

The ladle 30 is tilted by the tilting device 42 to pour into the mold 70. During casting, the tilting device 42, the lifting device 46, and the forward-backward moving device 48 simultaneously control 3 operations of tilting, lifting, and forward-backward moving of the ladle 30, so that the molten metal for cast steel is tilted about the solution outlet 31 of the ladle 30, and the position where the molten metal for cast steel flows out from the ladle 30 is kept constant. When the casting into one mold 70 is completed, the mold 70 is transferred to a size of 1 mold by the mold transfer line 60, and the casting machine 20 performs the casting into the next mold 70. When the mold transfer of the mold transfer line 60 takes time, the casting machine 20 may move and cast the next mold 70, and the casting machine 20 may move and cast the mold 70 while the movement is met.

For example, the ladle 30 has a capacity of 500kg, and 50kg of molten steel for casting is poured into the mold 70. In the mold 70 for casting steel, a shell mold having strength is used for heat resistance. The shell mold is formed by fixing a mold fired with a resin with an adhesive. The shell mold is accommodated in a molding box 72, and a spare sand mold is put in, and a weight for preventing floating is placed thereon. Thus, it takes 30 to 40 seconds to install a mold. On the other hand, the pouring into one mold 70 is completed within 3 to 5 seconds. Therefore, while the mold transfer of the mold 70 is performed 1 time by the mold transfer line 60, the casting is performed on 2 molds 70. That is, the casting machine 20 moves by 1 mold size and performs casting to 2 casting molds 70. Further, the casting may be performed on 3 or more molds 70 while moving upstream. The operation of moving the 1 die size upstream and pouring into 2 molds 70 was repeated 5 times. That is, the casting machine 20 moves to the upstream side by the size of 5 molds. Thereafter, the pouring machine 20 moves forward of the melting furnace 10, transfers the molten metal to the ladle 30, and returns to the position where pouring is started. Thus, the waiting time of the casting machine 20 is eliminated, and the casting machine 20 can use the time for which the mold transfer line 60 intermittently transfers the mold corresponding to the modulus moving upstream as the molten metal receiving time, so that the temperature of the molten metal for casting can be prevented from being lowered, and an efficient operation can be realized.

In this way, in the cast steel casting manufacturing systems 1 and 2, the ladle that receives the molten metal from the melting furnace 10 is not transported to the casting machine by the ladle transport carriage, but the molten metal is received by the ladle 30 of the casting machine 20. When the molten metal is transferred to the ladle 30, the cover 52 is attached, and the ladle 30 is moved from the molten metal receiving position to the pouring position by the roller conveyor 40. Then, the 3 operations of tilting, lifting, and forward-backward movement of the ladle 30 are simultaneously controlled by the tilting device 42, the lifting device 46, and the forward-backward movement device 48, and the ladle 30 is tilted about the solution outlet 31 of the ladle 30, thereby performing pouring. After the end of casting, the casting machine 20 moves to a position where the next mold 70 is cast. In this way, the time from receiving the molten metal to pouring is significantly shortened to prevent the temperature from decreasing, whereby even a molten metal that is high in temperature and is likely to have a reduced fluidity due to a temperature decrease can be poured into a mold before the temperature decreases, and even a mold having a small and complicated shape can be appropriately poured.

The temperature of the molten steel for casting in the ladle 30 is measured by the temperature sensor 38, and the measured information is transmitted to the control device. The control device (including other devices such as a control panel of the casting machine 20) generates an alarm when the temperature becomes lower than a predetermined temperature. The alarm may be transmitted to the operator by sound or light, or may be transmitted to a control device as a signal. The operator can also control the operation of the cast steel casting manufacturing system 1, 2 by means of an alarm. Alternatively, when the alarm is given, the controller may stop pouring from the pouring machine 20 to the mold 70, and the molten steel for cast steel remaining in the ladle 30 may be reheated and melted (returned to the melting furnace 10). That is, the molten metal for cast steel having a reduced temperature is not poured and appropriately cast, thereby preventing the production of a defective cast steel casting. In addition, the steel is reheated to be molten, so that the molten metal for casting steel is not wasted.

In the cast steel casting production system 2, the pressure of the cast mold 70 to be poured is further reduced. The mold 70 is depressurized, whereby the molten metal can be well cast, and gas defects can be prevented. In this case, since the plurality of connecting ports 82 are also provided, and the connecting ports 82 connected to the cast or poured mold 70 can be appropriately switched and the pressure can be reduced, it is efficient.

Further, the mold 70 for pouring the molten metal for cast steel moves the mold line 60, whereby the molten metal for cast steel therein is cooled and solidified to become a cast steel cast product. Thereafter, the cast steel casting is taken out from the mold by a mold taking-out device (not shown) or the like and is transported as a product to the next step. The mold is dispersed as sand, and the dispersed sand is reused for molding the mold via a sand processing facility or the like (not shown).

In the description so far, the molten metal for pouring is poured from the melting furnace 10 into the ladle 30, but the holding furnace may be used instead of the melting furnace 10.

In the above example, the case support type mold 70 is used, but the present invention is not limited to this, and for example, a case mold in which a spare sand mold is not used when the strength of the case mold is high may be used, or another mold may be used.