WO2002040203A1

WO2002040203A1 - Molten metal feeder and member made of aluminum titanate ceramic with improved unwettability

Info

Publication number: WO2002040203A1
Application number: PCT/JP2001/005571
Authority: WO
Inventors: Satoshi Kitaoka; Kazumi Kashiwagi; Fusayuki Nanjo; Hiroshi Kawamoto; Katsutoshi Noda; Toshio Kume; Masane Kimura; Masaharu Kimura; Yuji Kawasaki; Itsuo Suzuki; Sadahiko Suzuki
Original assignee: Japan Fine Ceramics Center; Kmc Co., Ltd.; Root Co., Ltd.; Kimura Co., Ltd.; Yushin Kosan Co., Ltd.; Marusu Glaze Co., Ltd.
Priority date: 2000-11-20
Filing date: 2001-06-28
Publication date: 2002-05-23
Also published as: US20050035504A1; JPWO2002040203A1; CA2429344A1

Abstract

A solenoid pump type molten metal feeder with high feeding accuracy of molten metal, comprising rotary blades rotating with the movement of molten metal in a molten metal transport pipe, wherein the rpm of the rotary blades is detected, thereby making it possible to measure the transport rate of molten metal.

Description

Description molten metal supply device and

Aluminum titanate ceramics members with improved non-wetting properties

〔Technical field〕

The present invention relates to a molten metal supply device that conveys and supplies, for example, molten metal aluminum and molten metal sodium. The present invention also relates to a technique for imparting and maintaining non-wetting properties of a ceramic member that comes into contact with a molten metal such as a molten aluminum alloy.

(Background technology)

For example, a linear induction electromagnetic pump that applies thrust to molten metal by electromagnetic induction is used to transport molten metal such as molten aluminum in a molten metal storage facility in a fast breeder reactor. .

In a molten metal supply device, particularly in a molten metal supply device in a manufacturing facility, it is important to supply a fixed amount of molten metal to a manufacturing cavity in order to ensure manufacturing accuracy.

In the case of a molten metal supply device equipped with an electromagnetic pump, the transfer speed and transfer time of the molten metal are adjusted by various current controls such as the frequency of the current supplied to the electromagnetic pump, the current density, and the current supply time. Molten metal was supplied to the cylinder.

However, since the electromagnetic pump applies thrust to the molten metal as a fluid, it was difficult to accurately control the transfer amount by current control.

When supplying to the cavity, even if a discharge cylinder is provided, the supply accuracy of the molten metal by the electromagnetic pump eventually becomes a problem. Even if an orifice or valve is provided in the supply path to the cavity, the supply amount of the molten metal depends on the supply accuracy of the molten metal.

In addition, the members of the molten metal supply device, particularly those that come into contact with the molten metal, need to be formed of ceramics having low thermal expansion and excellent thermal shock resistance. For example, in aluminum alloy production facilities, a fixed amount of aluminum alloy Ladles made of aluminum titanate ceramics are often used as measuring devices to transfer to molding machines. Such a ladle is made of aluminum titanate ceramics having excellent low thermal expansion and thermal shock resistance.

Here, it is known that aluminum titanate ceramics have low thermal expansion properties and are excellent in thermal shock resistance. However, the low thermal expansion of aluminum titanate ceramics is apparent due to cracks at the grain boundaries. Therefore, there was a problem that the mechanical strength was remarkably weak due to the grain boundary crack.

Therefore, in order to increase the mechanical strength while maintaining the apparent low thermal expansion property, silica of several wt% to 1 O wt% is generally added. As a result, grain growth during the sintering process of aluminum titanate is suppressed, and as a result, the grain boundary stress generated in the cooling process after sintering is reduced, and the generation of cracks is suppressed. The mechanical strength of Lamix is improved.

However, with aluminum titanate ceramics ladles, the non-wettability is greatly reduced due to continuous use of the molten metal with about 1000 times, and aluminum remains in the ladles and in the spouts. As a result, it becomes difficult to supply a constant amount to the molding machine, and the rejection rate increases due to fluctuations in the weight of the manufactured parts.

In addition, the solidified aluminum alloy mass attached to the spout of the ladle comes into contact with the forging system equipment, causing the destruction of the ladle itself or damage to the ladle machine.

At present, a method is used in which the molten metal supply ladder device is stopped after the non-wetting property is reduced, and the aluminum alloy attached to the ladle is mechanically peeled off. In order to improve productivity, it is required that non-wetting be maintained at least at 100,000 times of pumping.

In view of the above, there has been a demand for a molten metal supply device with good molten metal supply accuracy. In particular, there has been a demand for a molten metal contact member having good supply accuracy of the molten metal by imparting non-wettability to the molten aluminum alloy and its durability.

The present inventors have created the following inventions as means for solving the above problems. The present inventors have developed an electromagnetic pump type molten metal supply device with a high supply accuracy. That is, the present invention relates to a molten metal supply device,

A conduit for conveying the molten metal with an electromagnetic pump,

A rotating blade that is provided in the transport pipeline and rotates with the movement of the molten metal; and a detector that detects the number of rotations of the rotating blade,

A molten metal supply device comprising:

According to this device, it is possible to measure the transport amount of the molten metal transported in the transport pipeline by electromagnetic induction based on the rotation speed of the rotating blades detected by the detector. Alternatively, the transport amount can be adjusted based on the number of rotations. For this reason, the supply amount of the molten metal can be accurately controlled. In this apparatus, it is a preferable embodiment that the transport conduit includes a means for detecting the amount of molten metal in the transport conduit. According to this aspect, it is possible to compensate for the accuracy and precision in detecting and controlling the transport amount caused by a change in the amount of molten metal in the transport pipeline.

According to one aspect of the present invention,

A method of manufacturing molten metal by supplying molten metal using an electromagnetic pump, comprising a rotating blade in a transport pipeline for transporting the molten metal to a manufacturing cavity, wherein the rotating blade is moved during transport of the molten metal. Detect the rotation speed,

A method for controlling the supply amount of the molten metal by the rotation speed is also provided.

According to this method, it is possible to easily obtain a high-precision animal.

Further, according to another aspect of the present invention,

A measuring device for an electromagnetic pump type molten metal supply device,

Rotating blades provided in a molten metal conveying pipe and rotated with the movement of the molten metal;

A detector for detecting the number of rotations of the rotating blades,

An apparatus having: In a preferred embodiment, the weighing device further includes a means for detecting the amount of molten metal in the transport line provided in the transport line.

According to this device, the transport amount of the molten metal can be accurately measured. In addition, the present inventors examined the reduction of non-wettability of aluminum titanate ceramics to molten aluminum alloy, and found that silica added to aluminum titanate ceramics depends on A 1 and Mg in the aluminum alloy molten metal. It was found that Si particles were generated on the surface of the aluminum titanate ceramics after the reduction, and that the presence of the Si particles reduced the non-wetting property. Further, with the reduction of the silica, the surface of the aluminum titanate ceramics, to generate the M g O and A 1 ₂ 〇 _3, further from these, M g A 1 ₂ 〇 ₄ on the surface of the aluminum titanate ceramic produced I knew I was doing it.

That is, the present inventors have found that the presence of Si on the surface of aluminum titanate ceramics in contact with the molten aluminum alloy is necessary to suppress or avoid a decrease in non-wetting and to impart or maintain non-wetting. Alternatively, it has been found that this can be achieved by avoiding generation.

Therefore, according to the present invention, the following means are provided based on the above findings.

That is, a contact material for an aluminum alloy melt made of aluminum titanate ceramics,

At least a portion in contact with the molten aluminum alloy, containing _{_{A 1 2 0 3, M g}} O, and M g A 1 ₂ 0 1 kind or 2 or more components selected from the group consisting of _4, the A member provided with a layer having a low Si content is also provided for the substrate made of aluminum titanate ceramics.

In addition, the contact member is an aluminum alloy molten metal contact member made of aluminum titanate ceramics,

There is provided a member provided with an aluminum titanate layer having a lower Si content than the aluminum titanate ceramics base material at least in a portion in contact with the aluminum alloy melt.

Also, a molten metal supply device provided with these contact members is provided.

A method for producing an aluminum alloy molten metal contact member made of aluminum titanate ceramics,

At least a portion in contact with the molten aluminum alloy, A 1 ₂ 〇 ,, M g O and A 1 ₂ T i 0 is selected from the group consisting of ₅ aluminum titanate ceramic member Forming a layer containing one or more of the above-mentioned materials and having a lower Si content than the aluminum titanate ceramics base material;

_{_{A 1 2 0 3, M g}} O and or A 1 ₂ Τ ϊ 0 ₅ reacted with beauty Z or aluminum Oyo magnesium layer containing by step of generating a M g A 1 ₂ 0 _4, comprises a capital, A method is provided.

Also, the method for manufacturing a contact member for molten aluminum alloy,

Shall apply at the site where two or more members made of aluminum titanate ceramics are joined, in a zone that is in contact with at least the molten aluminum alloy, consisting of _{_{A 1 2 0 3, M g}} O and A 1 ₂ T i 0 ₅ Forming a layer containing one or more selected from the group and having a lower Si content than the aluminum titanate ceramics base material;

How comprising the step, to generate M g A 1 ₂ 0 ₄ by the action of magnesium and Z or aluminum layer containing the A 1 ₂ 0 _3, M G_〇 and / or A 1 ₂ T i 0 ₅ Is also provided.

Also, a method for producing aluminum alloys, comprising:

A portion in contact with at least the molten aluminum alloy, A 1 ₂ 0 _3, M g O and A 1 contains ₂ T I_〇 one or more members selected from the group consisting of _5, the titanium aluminum ceramics The aluminum alloy melt contacting member made of aluminum titanate ceramic having a layer having a lower Si content than the base material is contacted with the aluminum alloy melt containing Mg in at least a part of the fabrication process. , the step of generating a M g a 〇 ₄ in the layer containing the _{_{a 1 2 0 3, M g}} O , and Z or a 1 ₂ T i 0 _5,

And a method comprising:

Furthermore, according to the present invention, a manufacturing method of an aluminum alloy melt contact member, in a zone that is in contact with at least the molten aluminum alloy, A l ₂ 〇 _3, M g O and A 1 ₂ T i 0 the group consisting of ₅ A contact member made of aluminum titanate ceramics aluminum alloy, comprising one or more selected from the group consisting of: and a layer having a lower Si content than the aluminum titanate ceramics base material; In at least a part of the fabrication process, it is brought into contact with molten aluminum alloy containing Mg. _{_{Te, A 1 2 0 3, M}} g O and / or A 1 step of generating a M g A 1 ₂ 0 ₄ in the layer containing the ₂ T i 0 _5,

And a method comprising:

[Brief description of drawings]

Figure 1

It is a figure showing the whole molten metal supply device composition concerning the present invention.

Figure 2

FIG. 4 is a diagram when the transfer pipeline and the electromagnetic pump are viewed from above.

Fig. 3

FIGS. 4A and 4B are cross-sectional views illustrating a preferred arrangement of an electromagnetic pump with respect to a transport pipeline.

Fig. 4

It is sectional drawing which shows the whole measuring device in a molten metal supply apparatus.

Fig 5

It is a figure which shows an example of the structure of a rotating blade.

Fig. 6

FIG. 6A is a cross-sectional view of the arrangement state of the rotating blades in the transfer pipeline in a direction along the flow path of the molten metal. FIG. 6 (b) is a cross-sectional view of the arrangement state of the rotating blades in the transport pipeline in a direction crossing the flow path. FIG. 6 (c) is a diagram showing the arrangement state of the rotating blades in the transport pipeline as viewed from above. FIG. 7 is a diagram showing a means for detecting the amount of molten metal in a transport pipeline.

Fig. 8

It is sectional drawing which shows an example of the mounting structure of a rotating blade in a conveyance pipe.

Fig. 9

FIG. 4 is a perspective view showing a structure of a fitting hole and a cap for mounting a rotating blade to a transport pipeline.

Fig. 10

It is sectional drawing which shows an example of the fixing structure with respect to the conveyance pipe of a cap. It is a figure showing an example of a backflow prevention device.

Fig. 12

It is a figure which shows the control method of the electromagnetic pump at the time of the conveyance start of a molten metal.

Fig. 13

FIGS. 13 (a) and 13 (b) show the form of the ceramic ladle produced in the example. FIG. 13 (a) is a plan view, and FIG. 13 (b) is a cross-sectional view taken along line A_A of FIG. 13 (a).

Fig. 14

(A) and (b) showing the form of the joined body set made of ceramics produced in the example. FIG. 14 (a) is a longitudinal sectional view showing a state where the joined body set is vertically separated, and FIG. 14 (b) is a plan view of a lower member.

(Best mode for carrying out the invention)

Hereinafter, embodiments of the present invention will be described in detail.

An electromagnetic pump-type molten metal supply device according to the present invention includes: a rotating blade that rotates with the movement of the molten metal; and a rotating blade that rotates with the movement of the molten metal. A detector for detecting the number. The rotating blade and the detector constitute a weighing device according to the present invention.

In addition, in the method for producing a food according to the present invention, it is a preferable aspect to use the present supply device.

Hereinafter, an embodiment of the present invention will be specifically described with reference to a molten metal supply device according to the present invention.

FIG. 1 shows the overall configuration of the present molten metal supply device 2. As the molten metal supply device (hereinafter, also referred to as the present supply device) in the present invention, a device for supplying a molten metal (molten metal) for production (a production device), or a molten metal sodium supplied to a fast breeder reactor. Although it may be a device for supplying, it is preferably a molten metal supply device for production.

The supply device 2 is a device for supplying a molten metal for production, and includes a transfer pipe 4, an electromagnetic pump 10 arranged along the pipe, and a measuring device 20.

(Transport pipeline)

The shape of the transport line 4 for transporting the molten metal provided in the supply device 2 is particularly limited. However, it is preferably flat. In the case of a flat shape, an electromagnetic pump is efficiently constructed by arranging an inductor along the long side surface. In other words, a sufficient driving torque for the molten metal can be obtained without providing a core in the pipeline. Specifically, a flat rectangular tube or an elliptical cylinder can be used as the transfer conduit 4.

The material of the transfer conduit 4 may be a non-magnetic material through which a magnetic flux passes, and ceramics can be used. Preferably, the ceramic is a low thermal expansion ceramic having a thermal expansion coefficient of 1 × 1 o −: (room temperature to 100 000) or less. If the coefficient of thermal expansion exceeds this value, there is a high possibility that the molten metal will be broken by thermal shock during transportation. An example of such a material is aluminum titanate.

In the transfer pipeline 4, it is necessary to prevent the molten metal from being cooled and solidified. For this reason, it is preferable that the transfer pipeline 4 be kept warm so that the melting temperature is maintained. In particular, it is preferable to form a concave groove on the surface of the transfer pipe 4 to improve the thermal conductivity and wind the tubular heater around the transfer pipe 4. On the other hand, the electromagnetic pump 10 disposed around the transfer line 4 must be cooled in order to maintain its operation. For this reason, it is preferable that a heat insulating layer is formed on the outer periphery of the transport pipe that is heated and kept warm. The heat insulation layer is preferably composed of a heat insulation material and a gas (air) layer. Ceramics, glass, etc. can be used as the heat insulating material. Further, the gas layer can be formed by forcibly passing air through the ventilation path. It is preferable that such a heat insulating structure is provided in the entirety of the transport pipeline 4.

(Electromagnetic pump)

Various structures can be adopted as the structure of the electromagnetic pump 10 in the supply device 2. Any of an external type, an immersion type, and the like may be used, and modified ones thereof may be used.

In the electromagnetic pump 10, the inductor 12 is arranged so that a moving torque is generated in the molten metal in the transfer pipeline 4. The inductor 12 includes at least a steel core 14 and a coil 16 as components.

FIG. 2 shows a diagram of the transfer pipeline 4 and the electromagnetic pump 10 as viewed from above. Depending on the shape of the transfer line 4, a sufficient drive torque is generated in the molten metal in the transfer line only by the stay core 14 and the coil 16; The core may be provided inside the transport pipeline 4.

The case where only the stay core 14 and the coil 16 are provided means that the stay core 14 and the coil 16 are provided on the outside of the transfer pipe 4 via the transfer pipe 4 so as to face each other. In this case, the conductor 12 does not require a separate core inside the transfer pipe 4 because the width of the transfer pipe 4 is sufficiently small.

Further, the inductor 12 composed of the stay core 14 and the coil 16 can be provided inside the transfer pipeline 4. For example, the transfer pipe 4 has a double structure of an outer pipe and an inner pipe, and the inner pipe is provided with a stay core 14 and a coil 16, and the outer pipe itself is formed of a magnetic material to form a core. It can also be.

In addition, the inductor 12 can be arranged in various forms with respect to the transport pipeline 4, but is preferably arranged as shown in FIG. In other words, when the stay core 14 and the coil 16 are provided outside the transfer pipe 4, the transfer pipe 4 is placed on both sides of the vertically long transfer pipe 4 in a horizontal state (same height). It is preferable that they are arranged at an angle of 15 degrees from horizontal. If the temperature exceeds 15 degrees, there is a high possibility that the components of the electromagnetic pump 10 will be damaged when the molten metal leaks from the transfer pipeline 4. More preferably, it is inclined horizontally or in an angle range from horizontal to 6 degrees. As shown in FIGS. 3 (a) and (b), the transfer line 4 and the inductors 12 on both sides of the transfer line 4 are viewed from a cross section perpendicular to the axial direction of the transfer line 4. It is preferable that the horizontal center line and the horizontal centers of the inductors 12 on both sides coincide.

The present supply device 2 may also include a melting and holding furnace 18 for maintaining the molten metal in a molten state. In this case, it is preferable to provide the transfer pipeline 4 connected upward from the vicinity of the bottom of the melting and holding furnace 18. Further, in the case of the manufacturing apparatus, the tip of the transfer pipeline is connected to the manufacturing cavity 5.

(Measuring mechanism)

The supply device 2 includes a measuring mechanism (equipment) for the molten metal conveyed by the electromagnetic pump 10. The rotating blades 22 rotate with the movement of the molten metal, and the detector 32 detects the number of rotations of the rotating blades. FIG. 4 shows a detailed structure of the weighing device 20.

(Rotating blade)

FIG. 5 shows an embodiment of the rotating blade 22. The rotating blades 22 are formed in a shape and structure that can be rotated by molten metal that moves in the transport pipeline 4. The shape of the blade is not particularly limited, but may be a screw type, an impeller, or the like. Preferably, it is an impeller type.

In the present device 2, the rotating blade 22 is constituted by a shaft 24 and a blade 26 provided on the shaft 24. Pressure is applied to the blade 26 due to the movement of the molten metal, whereby the blade 26 and the shaft 24 are rotated.

It is preferable that the constituent material of the rotary blade 22 has a non-wetting property, a contact resistance, a thermal shock resistance, and the like with respect to the molten metal applied to the supply device 2. In particular, when applied to the molten metal § Rumi two © beam, it is preferable thermal expansion coefficient is less than 1 X 10- ⁶ Z ° C (room temperature ~ 100 0 ° C). If the coefficient of thermal expansion is exceeded, the risk of breakage of the rotating blades 22 increases significantly. The nonmagnetic material having such a thermal expansion coefficient such as a ceramic, in particular, mention may be made of ceramic mainly composed of aluminum titanate _{_{(T i A 1 2 0 5}} ) or sialon. Sialon is a kind of solid solution of Si ₃ N ₄ ). There are two types of sialon: 3′-sialon and α-sialon. Sialon is a compound represented by S i _{6 —} _Ζ Α l _z O _z N _{6 —} _z , where ζ is greater than 0 and can take a value up to 4.2. Further, α-sialon is a compound represented by M _x (S i, Al) ₁₂ (N, O) ₁₆ , and X is larger than 0 and equal to or smaller than 2.0. M is at least one selected from the group consisting of Li, Mg, Ca, and rare earth elements (including Y, Nd, Yb, etc.).

The rotating blades 22 are preferably arranged in the transport pipeline 4 such that a rotating shaft (shaft) 24 is orthogonal to the moving direction of the molten metal. More preferably, the rotation axis 24 is vertical. In particular, this is preferable when the inductors 12 are arranged on both sides of the transfer pipeline 4. FIG. 6 shows a state of the rotating blades 22 arranged in the transport pipeline 4. As shown in FIGS. 6 (a) and 6 (b), when the rotating shaft 24 of the rotating blade 22 is arranged orthogonally and perpendicularly to the moving direction of the molten metal, FIG. ), It is preferable that the rotary shaft 24 is disposed eccentrically with respect to the longitudinal center of the transport pipeline 4, that is, the rotary shaft 22 and the side wall of the transport pipeline 4 It is preferable to arrange the molten metal channels formed therebetween so that the width of the channels is not uniform. With such a configuration, the uneven movement of the molten metal causes an uneven pressure difference to be applied to the rotating blades 22, so that the rotation of the rotating blades 22 is smoothly started and continued. In this case, a greater pressure is applied to the blade 26 on the side where the width of the flow path of the molten metal becomes large, and the rotating blade 22 is rotated so that the blade 26 on the side moves downstream. Become.

In addition, it is preferable that the inductor 12 is also disposed at the position where the rotary blade 22 is disposed. In this case, it is preferable that the inductor 12 is disposed so as to sandwich both sides of the rotary shaft 24 of the rotary blade 22, and more preferably, the inductor 12 is transported between the inductors 12 facing the rotary blade 22. It is eccentric in line 4. With this arrangement, the molten metal is driven by the inductor 12, and the rotating blades 22 are effectively rotated.

Furthermore, in order to facilitate the rotation of the rotating blades 22, it can be directly driven by an external motor 40 (see FIG. 4). As a result, a sufficient rotational force is supplied to the rotating blades 22, and the rotating blades can be reliably rotated to transport the molten metal. In particular, driving by the external motor 40 is preferable for starting rotation of the rotary blade 22.

(Rotation detector)

The rotation number detector is configured to directly or indirectly detect the rotation transmitted to the shaft 24 of the rotary blade 22. As the detection mechanism, various conventionally known methods can be adopted.

For example, as shown in FIG. 4, the rotation number detector is a pulse generator provided to detect the rotation of the shaft 24 inside the conveying pipeline 4 when the rotation is transmitted and generate a pulse. 3 can be 2. The pulse generated by the pulse generator 32 is further transmitted to a device having a pulse counter mechanism, so that the pulse is generated. The number of turns can be easily detected.

The transport amount of the molten metal when the rotating blades 22 provided as described above makes one rotation can be calculated by calculation. However, the transport amount may fluctuate due to structural errors and operational conditions. Therefore, it is preferable to set the parameters based on the fluctuation factors based on the actual measurement, and to be able to display the supply amount based on the parameters at the time of actual weighing.

Further, as shown in FIG. 4, by transmitting the driving force of the external motor 40 to the shaft 24, the rotary blade 22 can be formed to be rotatable from the outside. Thereby, sufficient rotational force can be applied to the rotating blade.

When the rotary blades 22 are driven to rotate by an external motor 40 or the like, a rotating body 34 (preferably a plate-like body) that rotates with the rotation of the shaft 24 outside the conveying pipeline 4 is provided; A sensor 36 for remotely detecting the rotation of the rotating body 34. In this case, the rotation (number) can be detected by the photoelectric sensor 36 by providing the rotation detecting hole in the rotating body 34. When such a rotating body 34 and the sensor 36 are provided, the rotating blades 22 in the transport pipeline 4 and the rotating body 34 are integrally formed, so that the rotating blades 22 can rotate. When an abnormality occurs, an abnormality also occurs in the rotation of the external rotating body 34. At this time, an abnormality of the rotary blade 22 can be detected by comparing the number of rotations by the sensor 36 with the number of rotations to be generated in the evening. Therefore, when the rotating blades 22 are driven by an external motor or the like, the rotating body 34 and the sensor 36 effectively function as an abnormality detector in the rotating blades 22 and Z or the transport pipeline 4.

Even when the rotating blades are not driven by the external motor 40, the rotating body 34 and the sensor 36 function as a mechanism for checking the rotating state of the rotating blades 22. The rotating body 34 can also be used as a heat insulating material. In this case, it is preferable that the rotating body 34 is formed of a material having high heat insulating properties and has a large surface area. Further, by forming an outlet 38 of a cooling means such as air supplied from a gas supply source to the rotating body 34 so as to blow the cooling means such as air, a more effective effect can be obtained. Thermal insulation is possible.

(Detection of the amount of molten metal in the transport pipeline) When measuring the amount of molten metal conveyed in the conveying line 4 from the number of rotations of the rotary blades 22, the amount of molten metal conveyed per number of rotations changes depending on the amount of molten metal in the conveying line 4 . In order to compensate for the change in the transport amount caused by the molten metal amount, a means for detecting the molten metal amount in the transport pipeline 4 is provided. The means is not particularly limited, but is preferably a means for detecting the level of the molten metal by detecting the liquid level of the molten metal in the transport pipeline 4. For example, a float having buoyancy with respect to the molten metal can be provided in the transfer conduit 4, and the displacement of the float can be provided so as to be detectable from outside. In order to detect the variation of the float from outside, the float may be provided with a detecting member that is linked to the displacement of the float.

A preferred configuration is illustrated in FIG. FIG. 7 shows a state in which the float 28 is attached to the transport pipeline 4 via the attachment portion 30. In this example, the float 28 has a locking portion 28 a that is locked to the upper edge of the mounting portion 30, and a contact portion 28 b that comes into contact with the molten metal in the transport pipeline 4. The locking portion 28a has an indicating portion 29 for indicating the displacement of the float 28. The mounting portion 30 is configured to hold the float 32 in a swingable manner by locking the locking portion 28a of the float 28 to the upper end edge thereof, and to swing the float 28. It has a hollow section 30a that can handle the maximum displacement without hindering movement. In this example, the float 28 itself also serves as a detection member, and the displacement generated at the contact portion 28b is transmitted to the locking portion 28a and the indication portion 29 as it is, and It is easily grasped from. It should be noted that the displacement of the float can be transmitted to the outside by a separate detection member.

The amount of displacement of the float transmitted to the outside can be detected by various conventionally known detecting means, converting means, and the like, and can be detected as the amount of molten metal. For example, it can be detected by a differential transformer, a magnetic sensor, or the like. Further, the transported amount of the molten metal, which is determined from the rotation speed of the rotary blades 22, is corrected based on the obtained molten metal amount. Float and the mounting portion, and the detection member are both non-wettable, excellent heat shock resistance, it is preferred thermal expansion coefficient (room temperature to 1 0 0 0) is less than in 1 X 1 0- ^6. Specifically, it is preferable that the composition be mainly composed of aluminum titanate.

(Rotating blade fixed structure) The rotary blades 22 need to be disposed in the transport pipeline 4 with good sealing properties, and are preferably mounted so that they can be easily removed from the transport pipeline 4 for maintenance and replacement. In addition, it is preferable that the device is mounted so that the influence of thermal expansion can be avoided as much as possible.

For this reason, as shown in FIGS. 8 and 9, it is preferable that the mounting of the transfer pipeline 4 and the rotary blades 22 is mainly performed by fitting with the tapered uneven portion. More specifically, a tapered fitting hole 42 having a smaller diameter is provided in the transfer pipe 4 on the inner side of the pipe, and a taper-shaped fitting corresponding to the fitting hole 42 is provided. A cap 44 having a convex portion 46 is used, and a through hole 48 in which the shaft 24 can be mounted is provided in the convex portion 46. By this, the fitting of the fitting hole 42 and the cap 44 allows the rotating blades 22 to be mounted in the transport pipeline 4, and the hermeticity of the pipeline 4 is improved by mechanical fitting. Can be secured.

Considering the thermal expansion, the transport conduit 4 and the cap 4 4 is preferably composed of a material ^{1 X 1 0 _ 6 Z °} C ( Atsushi Muro ~ 1 0 0 0) The following thermal expansion coefficient More specifically, it is preferable that the composition be mainly composed of aluminum titanate. The rotating blades are also preferably made of a material having a thermal expansion coefficient of 1 × 10 ^→ / (room temperature to 1000) or less, and are preferably made of aluminum titanate ceramics. The means for fixing the cap 44 to the transfer conduit 4 is not particularly limited. It can be fixed with a heat-resistant material, for example, a fastening member (stainless steel band or the like) such as stainless steel or a screw member. For example, as shown in FIG. 10, one end of an endless belt-shaped stainless steel band 50 is placed over the edge of the cap 44, and the other end of the band 50 is fixed to a predetermined portion. It can be fixed by locking to the band locking portion 52.

The fastening member preferably has a coefficient of thermal expansion of 2 X 10 " ^VoC (room temperature to 800V) or less.However, in order to prevent the fastening member from loosening due to thermal expansion of the fastening member. It is preferable that a fixed tension is applied to the fastening member, for example, in the band locking portion 52, the fastening member 50 locked by the locking portion 52 is fixed. The band can be attached so that the pressed state can be maintained irrespective of thermal expansion.Specifically, the band locking portion 52 is arranged at a predetermined position via the elastic body 54 in the stretched state. So that In this case, the band locking portion 52 is always urged by the restoring force of the elastic body 54 in the direction in which the elastic body 54 tries to restore. Here, the direction in which the node locking portion 52 is urged matches the direction in which the tightening state by the fastening member 50 can be strengthened. By locking the fastening member 50 to the band locking portion 52, the fastening member 50 is constantly urged in the pressing direction. As a result, even if the fastening member 50 thermally expands, the influence thereof is avoided, and a stable pressure-tight state is secured.

In addition, for example, the fastening member 50 can be urged in the pressing direction by using a compressed elastic body. In this case, the restoring force of the elastic body to expand and contract is used to bias the fastening member. Specifically, an elastic body is fixed in a compressed state inside the wedge-shaped fastening member, and the fastening member is mounted in piles on the restoring force of the elastic body. In this case, even if the fastening member thermally expands, the looseness of the pressed state can be offset by the restoring force of the elastic body. As the elastic body, an elastomer can be used in addition to springs of various shapes. However, it is preferable to have heat resistance and low thermal expansion property. It should be noted that such a fixing structure is particularly preferable when the shaft 24 is inserted from above the transport pipeline 4.

The position of the rotary blade 22 can be adjusted by height adjusting means provided above the shaft 4 outside the conduit 4. For example, the adjusting means may be a screw mechanism or a structure in which roller bearings having different heights are formed to be exchangeable.

Further, it is preferable that the rotary blade 22 be provided with a heat insulating material on the shaft 24 in order to prevent the heat of the rotary blade 22 from being transmitted outside the transfer pipeline 4.

(Backflow prevention device)

In order to prevent the backflow of the molten metal due to the rotation of the rotating blades 22, a backflow prevention device may be provided. The backflow prevention device is located on the downstream side of the rotating blades, on the rear side in the rotational direction of the rotating blades, that is, on the downstream side of the rotating blades 22 as shown in FIG. A wall-like body 60 may be provided at a location corresponding to about a quarter turn that rotates in a reverse direction, so as to approximately follow the rotation locus of the tip of the blade 26. According to such a wall-like body 60, between the rotating blades 26 The held molten metal is prevented from moving in the reverse direction as it is with the rotation of the rotary blades 22, and is moved downstream along the original flow of the molten metal.

The form of the wall-like body 60 is not particularly limited, but it is sufficient that the wall-like body 60 has a wall at least approximately along the rotation locus of the tip of the blade 26.

Next, a method of manufacturing a product by supplying a molten metal to a fabrication cavity or the like using the molten metal supply device 2 will be described.

First, the molten metal in the melting and holding furnace 18 is supplied to the manufacturing cavity by operating the electromagnetic pump 10. With the transport of the molten metal, the rotating blades 22 provided in the transport pipeline 4 rotate, and the number of rotations is detected by the detector 32. If the rotation speed and the supply amount of molten metal are linked, the operating time and supply current of the electromagnetic pump 10 are adjusted based on this rotation speed so that a certain amount of molten metal is supplied to the cavity. Then, a desired rotation time and / or number of rotations of the rotary blade 22 can be obtained. As a result, an accurate amount of molten metal can always be supplied to the fabrication cavity, and a highly accurate product can be manufactured.

Further, when a means for detecting the amount of molten metal (molten metal level) flowing in the transport pipeline 4 is provided, the molten metal obtained from the rotation speed of the rotary blades 22 based on the detected amount of molten metal is provided. Fluctuations in the supply amount (caused by the amount of molten metal (molten metal level)) are compensated, and more accurate and more accurate supply amount control becomes possible.

At the start of driving of the electromagnetic pump 10, the pressure caused by the uneven movement of the molten metal is applied to the rotating blades 22 so that the rotating blades 22 in the transfer pipeline 4 rotate smoothly. Preferably, the operation of the electromagnetic pump 10 is controlled. That is, it is preferable that the thrust of the same pressure is not applied to the blade 26 provided in the rotary blade 22 by the movement of the molten metal. Specifically, the inductors 12 arranged opposite to the shaft 24 of the rotary blade 22 are not operated simultaneously. In particular, as shown in FIG. 12, when the shaft 24 is eccentrically arranged in the transport pipeline, the inductor 1 2 on the side where the clearance between the rotary blade 22 and the inner wall of the transport pipeline 4 is large is 1 2 First, the rotation of the rotating blades 22 caused by the operation of the inductors 12 is checked by the detector 32. Here, after confirming the stable rotation of the rotating blades 22, for example, after confirming the rotation of 10 rotations (10 pulses) or more, the inductor 12 on the opposite side is also operated, and the electromagnetic pump 1 is turned on. 0 is the normal operating state. Such a differential method is particularly effective when the thrust by electromagnetic induction is small.

The components of the present invention described above can be applied individually or in combination to the molten metal supply device, the weighing device, the method of manufacturing a solid product, and the manufacturing device according to the present invention.

As described above, the present invention can adopt the following aspects.

(1) An electromagnetic pump type molten metal supply device,

A conduit for conveying the molten metal with an electromagnetic pump,

With

The molten metal supply device, wherein a rotating shaft of the rotating blade is eccentrically arranged in the transport pipeline.

(2) An electromagnetic pump type molten metal supply device,

A conduit for conveying the molten metal with an electromagnetic pump,

With

The rotating blade has a shaft and a blade provided on the shaft, and the jsci shaft

A convex portion fitted into a tapered fitting hole provided in the transport conduit; a through hole which penetrates the convex portion and into which the shaft can be fitted;

And a molten metal supply device attached to the transport conduit via a cap member having the following. In this apparatus, the shaft, the rotating blades, the transport conduit, and the cap member are each mainly made of aluminum titanate. This is a preferred form.

(3) An electromagnetic pump type molten metal supply device,

A conduit for conveying the molten metal with an electromagnetic pump, A rotating blade that is provided in the transport pipeline and rotates with the movement of the molten metal; and a detector that detects the number of rotations of the rotating blade,

With

The molten metal supply device, wherein the cap member is press-fastened to the transfer conduit by a fastening member.

In this embodiment, it is preferable that the fastening member is a low thermal expansion metal such as stainless steel.

(4) An electromagnetic pump type molten metal supply device,

A conduit for conveying the molten metal with an electromagnetic pump,

With

A molten metal supply device, wherein the cap member is clamped to the transfer conduit by a clamping member, and a tension is applied to the clamping member to a degree that can offset thermal expansion of the clamping member. . In this embodiment, the tension is preferably applied by an elastic body such as a spring member.

(5) An electromagnetic pump type molten metal supply device,

A conduit for conveying the molten metal with an electromagnetic pump,

With

The molten metal supply device, wherein the rotating blades are mainly made of a low thermal expansion ceramic such as aluminum titanate or silicon porcelain.

ADVANTAGE OF THE INVENTION According to this invention, the supply precision of molten metal can be improved in the electromagnetic pump type molten metal supply apparatus. In addition, it is possible to provide a manufacturing apparatus having a high molten metal supply accuracy.

Further, according to the apparatus of the present invention, it is possible to produce a highly accurate animal.

(6) The device according to any one of (1) to (5) above,

A molten metal supply device, comprising: means for detecting an amount of molten metal in a transport pipeline. According to. Device, it is possible to supply control high melting metal precision _c

(Aluminum alloy molten metal contact member)

Next, the aluminum alloy molten metal contact member will be described.

The aluminum alloy in the present invention means an alloy containing aluminum as a main component. Specifically, in addition to aluminum, it contains at least one or more metals that can form an alloy with aluminum, such as Cu, Si, Mg, Zn, Fe, Mn, Ni, and Ti. Just do it. Preferably, it contains Mg. Mg is preferably contained in an amount of not more than 20%.

Examples of the aluminum alloy that can be used in the present invention include those listed in Table 1 (unit: wt%).

【table 1】

The molten alloy contact member of the present invention is preferably applied to a molten metal member having a portion that may come into contact with the molten alloy. Specific examples include a ladle, a molten metal conveying pipeline, a stirrer, and the like. Maintenance of such a portion is facilitated, and the accuracy of drawing the molten metal is improved. In particular, it is preferable to apply to a ladle.

Also, the present invention can be preferably applied to a member having a joint portion of aluminum titanate ceramics, such as a pipe and a forming die. This is because the non-wetting property of the interface at the joint portion is improved, so that the intrusion of the molten metal by the capillary force into the gap at the joint portion can be effectively suppressed. This facilitates maintenance of the joint.

The molten alloy contact member of the present invention is preferably applied to an electromagnetic pump type molten metal supply device. In particular, the present invention is preferably applied to the rotating blade, the blade, the shaft, the cap member, the float, and the float mounting portion in the molten metal supply device of the present invention. The aluminum titanate ceramic serving as the base material of the contact member of the present invention is a ceramic mainly composed of aluminum titanate (Al ₂ Ti 0 ₅ ) and contains Si. S i is typically contained in the form of silica (S i 0 ₂ ). However, the present invention is not limited to this mode. The metal element may also be in the form of a double oxide with another metal. The content of silica in the present aluminum titanate ceramics is not particularly limited, but is usually about 1 to 10% by weight. Preferably, it is 4 to 8 wt%. The aluminum titanate ceramics may contain Fe ₂ 〇 ₃ , MgO and the like.

Aluminum titanate ceramic of the contact member, the site come in contact with at least the molten alloy, A 1 ₂ 0 _3, MgO and Mg A 1 ₂ 〇 one or more kinds of components selected from the group consisting of ₄ Is provided. Providing such a layer effectively suppresses the diffusion of Si in the aluminum titanate ceramics to the contact side with the molten alloy in the case of contact with the molten aluminum alloy.

Further, when Si is contained in the molten alloy, contact between the Si and the aluminum titanate ceramic can be avoided.

A 1 ₂ 0 _3, MgO and MGA 1 ₂ 0 layer containing one or two or more _{components 4} is selected from the group consisting consists essentially of layers of these single component, Oh Rui A layer substantially composed of a combination of these components can also be formed. In any case, it is preferable that these components are substantially constituted or consist only of these components. More preferably, it is a single phase of one type of ceramic component substantially free of other ceramic components. Further, the layer may have a laminated structure including a plurality of layers.

A 1 ₂ 0 ₃ is preferably is preferably a- A 1 ₂ 0 _3. Non _A 1 ₂ 0 ₃ layer, after forming the alumina film by sol dip coating, etc., calcined in the atmosphere (preferably 1 100 to 1500) obtained by.

The MgO layer can be obtained by dissolving a magnesium salt in water, dip-coating, and firing in air (preferably at 1100 to 1500). Preferably, it is obtained by dip-coating an aqueous solution of magnesium nitrate, followed by baking in air (preferably at 1100 to 1500).

The MGA l ₂ 〇 ₄ layer, after the formation of the A 1 ₂ 0 ₃ layer and Z or MgO layer, obtained by the Mg or MgO to be membrane, and Z or, exert A 1 or A 1 ₂ 〇 ₃ Can be Further, the raw material of the film prepared so as to obtain the MGA 0 ₄ And spinel is produced by firing. Preferably, after forming the α_Α 1 ₂ 〇 _three layers or MgO layer, magnesium melt, the molten metal (e.g. aluminum alloy melt) containing Mg, it is possible to in situ by dipping the member fixed time. Most preferably, alpha-A 1 ₂ 0 after ₃ layer formed, is in situ a MgA 1 ₂ 0 ₄ layer.

Contains one or more components selected from the group consisting of A 1 ₂ 0 _3, MgO and MGA 1 ₂ 0 ₄ layers, summer low S i content than titanate ceramic which is a base material ing. It is preferably at most 3 wt%, more preferably at most lwt%. Further, it is preferable that Si is not substantially contained. Here, “substantially free of Si” means that the content of Si is 0.1 wt% or less, and more preferably 0.01% or less.

A 1 ₂ 0 _3, 1 ^^ 0 and 8 eight 1 ₂ 0 ₄ containing layer to have the following (1) any one of the diffusion suppression function of the three kinds of - (3) preferable.

_{_{(1) A 1 2 0 3}} , MgO and MGA 1 ₂ 0 ₄ containing layer (other S i, silica (S I_〇 ₂₎ is force typical) S i in aluminum titanate ceramics diffusion Can be suppressed. More specifically, it is required to have a denseness and / or a film thickness enough to exert the diffusion suppressing function.

The diffusion of Si in the aluminum titanate ceramics means the diffusion of Si in the outward direction (the molten metal side) of the aluminum titanate ceramics.

(2) The layer can suppress the diffusion of A1 and Mg in the molten aluminum alloy toward the aluminum titanate ceramics. More specifically, the density and Z or film thickness are set to such an extent that the diffusion suppressing function can be exhibited.

(3) When Si is contained in the aluminum alloy melt, the diffusion of this Si to the titanate ceramics side can be suppressed. More specifically, it is required to have a denseness and / or a film thickness that can exert the diffusion suppressing function.

Among them, more preferably, two or more types are provided. In particular, it is preferable to have (1) and (2). Further, when Si is contained in the aluminum alloy, it is preferable to provide (3). Most preferably, it has any diffusion suppression function. In order to exhibit such a diffusion suppressing function, the film thickness is preferably from 0.1 lm to 1000 zm. If the thickness is less than 0.1 ^ m, the coating is worn away early due to the flow of the molten metal in repeated contact with the molten alloy, and the diffusion inhibiting effect and the substantially non-wetting property cannot be realized. If the thickness exceeds l OOO zm, cracks and peeling occur in the cooling process after coating baking due to the difference in the coefficient of thermal expansion between the aluminum titanate ceramics and the coating, and the diffusion prevention effect cannot be exhibited. It is. More preferably, it is 1 m to 500 m. Further, it is preferably from 10 m to 100 m.

Further, from the viewpoint of denseness, A 1 ₂ 0 _3, MgO and MgA 1 ₂ 0 ₄ containing layer, have shifted also preferably 30% or less porosity. If the porosity exceeds 30%, it becomes difficult to suppress the diffusion of A, Mg, and Si in the aluminum alloy melt and the diffusion of Si in the aluminum titanate ceramics.

The protective layer may be an aluminum titanate (Al ₂ Ti ₅ ) layer having a lower Si content than the base titanate ceramics. By forming the layer, the surface of the layer, by contact with the molten alloy, shed - A 1 ₂ 0 ₃ and MgO, MgA 1 ₂ 0 ₄ protective layer which can impart and maintain the generated non-wettability Is generated on the fly. Preferably, the content of Si is 3 wt% or less, more preferably, 1 wt% or less, and further preferably, Si is substantially not contained. Also in such an aluminum titanate layer, it is necessary to have a density and a Z or film thickness that can suppress the diffusion of A, Mg, or Si in the molten aluminum alloy and the diffusion of Si in the aluminum titanate ceramics. It is preferably formed. That is, the thickness is preferably 0.1 to 1000 / m, more preferably 1 to 500 111, and the porosity is preferably 30% or less. Even in the aluminum titanate layer, Si "Substantially does not contain" is preferably 0.1 wt% or less, more preferably 0.01 wt% or less. Note that contain one or more components selected from the group consisting essentially it is preferable that a single phase of aluminum titanate force A 1 ₂ 0 _3, MgO and MGA 1 ₂ 0 ₄ May be.

In the present _{_{invention, A 1 2 0 3, MgO}} , MgA 1 2 0 4 and Z or A 1 ₂ T i 0 ₅ by providing a surface layer portion containing, in either case of the coating, thereby suppressing the diffusion of the aluminum titanate ceramic surface S i by contact with the secondary aluminum © beam molten alloy, ensure non-wetting can, furthermore, subsequently, by Mg a 1 ₂ 0 ₄ film finally obtained by contact or the like with the molten aluminum alloy, the non get wet Re resistance of the contact portion can be efficiently ensured. Therefore, the non-wetting property can be maintained for a long time.

Further, MgA 1 ₂ 0 ₄ layer finally obtained is also for suppressing the penetration diffusion of S i, can maintain a stable non-wettable.

Therefore, when an aluminum alloy material is manufactured using a member that provides any one of these layers at a contact portion with the aluminum alloy melt, a highly accurate structure can be efficiently achieved.

Further, the aluminum titanate ceramics member comprising MGA 1 ₂ 〇 _four layers according to the present invention, forms the shape of the A 1 ₂ 0 _3, MgO and Z or A 1 ₂ T i 0 ₅ containing layer in a predetermined region, use in铸造process of actual aluminum alloy, these sites by contacting the molten aluminum alloy containing Mg and Z or Mg_〇, can be obtained by forming a MgA 1 ₂ 0 ₄ layer. Thus, in particular, without forming a MgA 1 ₂ 0 ₄ layer, only form a A 1 ₂ 0 ₃ layer and the like, can easily be obtained M gA 1 ₂ 0 ₄ layer.

Further, during錶造process, initially, A 1 ₂ 0 Although non-wettable by the _third layer or the like Ru is secured, with increasing contact time, subsequently, MgA 1 ₂ 0 ₄ layer is generated in situ, this since the non-wetting by MgA 1 ₂ 0 ₄ layer is ensured, it is possible to extend the non-wetting life of aluminum titanate ceramics member made efficiently.

〔Example〕

Example 1: Preparation of aluminum titanate ceramics

As raw material powder of aluminum titanate (A l ₂ T I_〇 _5), it was used Mars glaze joint stock company manufactured _TA-2 (S i 0 2 amount 5w t%). Water and alumina balls were mixed with the raw material powder in a ball mill for 63 hours by adjusting the weight ratio of the raw material: alumina ball: water (1: 1: 0.7). Then, this Al ₂ Ti 0 ₅ slurry After passing one sieve (200 mesh) to obtain a press cake of A 1 ₂ T I_〇 ₅ performs dehydration by a filter press.

To this press cake, add appropriate amounts of water, a deflocculant (manufactured by Chukyo Yushi, trade name: D-305) and a binder (manufactured by Chukyo Yushi, trade name: WE-518), and the specific gravity of the slurry is 2.:! 2.2.3 g / cm ³ .

Thereafter, the slurry was poured into a gypsum mold, molded and formed, and then dried at room temperature to obtain a green molded body. The green compacts were of two types: a ladle-shaped one as shown in Fig. 13 and a container-like bonded body set (two members) having the joints shown in Fig. 14. The ladle-shaped body 102 is a hemispherical container provided with one gate as shown in FIGS. 13 (a) and (b), and the joined body set is vertically arranged as shown in FIG. 14 (a). As shown in FIG. 14 (b), the container 106 is made up of two members. The opening of the lower member 108 has a tapered inner peripheral surface 110, and the upper member 112 is the inner peripheral surface. It is formed in a substantially annular body having an outer peripheral surface portion 114 fitted to 110. The upper and lower two members 1 12 and 108 are fitted together to form an integral container.

Moreover, the green molded body, by baking 1 hour in a 1600 air, to obtain a A 1 ₂ T i 0 ₅ ceramic sintered body. Example 2: Formation of A 1 ₂ 0 ₃ layer and MGA 1 ₂ 〇 _four layers

The resulting A 1 ₂ T i 0 ₅ ceramics sintered body (a total of three) to alumina sol (Nissan Chemical Industries, Ltd., trade name: Alumina Sol 200 or Alumina Sol 520) after was dip coated and dried at room temperature. Thereafter, by baking 1 hour at 1 100 in air to form a alpha-A 1 ₂ 0 ₃ layers of whole 5 PI thickness surface of each A 1 ₂ T i 0 ₅ ceramic sintered body.

Then, it is immersed in a molten aluminum alloy containing a trace amount of Mg (0.5wt%) (A4C: composition is shown in Table 1) at 700 ° C for 1 hour. _{_{Thus, A 1 2 T i 0 5}} α- A 1 2 0 3 layers of ceramic surface reacts with Mg in A4 C molten, MGA 1 ₂ 〇 _four layers of a single phase A 1 ₂ T i 0 _{5 In-} situ formation on ceramic surface. The thickness of M g A 1 ₂ 0 ₄ layer, A 4 C melt impregnation before Fei - filed by the same and A 1 ₂ 0 ₃ layer 5 m Was.

Incidentally, A 4 C the surface of the molten metal before and after immersion of the A 1 ₂ T I_〇 ₅ ceramic sintered body, by X-ray diffraction analysis, single A l ₂ 〇 ₃ (molten metal before immersion) shed or MGA l ₂ 〇 ₄ (After immersion in the molten metal) was confirmed. The thickness of each layer was measured by energy dispersive X-ray diffraction analysis. Example 3: Evaluation of non-wetting property

(1) Wetting angle

For molten aluminum alloy (A4C) was measured wetting angle as non-wetting Evaluation of A 1 ₂ T i 0 ₅ ceramic sintered body.

The A 1 ₂ T I_〇 ₅ ceramic test piece used are the following three types. That is, i) After cutting the surface of the sintered body prepared in Example 1 into 25mmX25mmX6mm, the surface was finished with 25mmX25mm surface with a # 800 diamond grinding stone (thickness 5mm), and the surface roughness (center line) that the average roughness) of about 3 m, ii) the example 2 using the sintered body the surface finish, Fei thickness of 5 m on the surface - that to form a 1 ₂ 0 ₃ layer , iii) further a- a 1 ₂ 0 ₃ layer a 1 having formed a ₂ T i 0 ₅ ceramic sintered body in the aluminum alloy melt (A4C, 720 ° C) to be immersed for 50 hours, the surface of the α- It was used with varying a 1 ₂ 0 ₃ layers of MgA 1 ₂ 0 ₄ layer.

For the measurement of the wetting angle, an MH-type induction-linked observation machine manufactured by Union Optics Co., Ltd. was used. After placing the above test piece on the heating part of this equipment with the final treated surface (25 _mm x 25 _mm surface) facing up, a cylindrical aluminum alloy block (A4C) with a diameter of 10 mm and a length of 10 mm is placed on that surface. . Then, in an argon gas atmosphere (flow rate 2500 cc / min), the temperature is raised from room temperature to 700 at a rate of 5 / min, and then maintained for 30 seconds. Thereafter, at 700 ° C, a lamp beam was applied to the aluminum alloy and the test piece to project a shadow on the screen, and the contact angle between the test piece surface and the aluminum alloy was measured from the image.

The wetting angles at 700 are as follows: A 1 ₂ T i 0 ₅ sintered _{= 120 °, a- A 1 2} 0 3 coating A 1 ₂ T i 0 ₅ sintered _{= 135 °, MgA l 2 0} 4 Kotin grayed A 1 ₂ T i 0 ₅ sintered = 128 °, and the by α-Α 1 ₂ 0 ₃ coating and MGA 1 ₂ 0 co one coating, non to aluminum alloys a 1 ₂ T i 0 ₅ sintered body It was found that the wettability was improved.

(2) Non-wetting life

A 1 ₂ T i 0 ₅ sintered ceramic ladle form - on the inside (non-A 1 ₂ 0 ₃ Layers comprising one), and 2 kg injected 700 aluminum alloy (A4C) melt was held for 50 seconds Thereafter, the process of discharging the molten metal in the ladle was repeated until the molten metal adhered to the inner wall of the ladle and remained when the molten metal was discharged. As a result, according to the ladle produced in the example, no adhesion of the molten metal was observed until this step was completed 12,000 times. This indicated that the ladle could retain and maintain good non-wetting properties. Further, at the time of termination 1 2,000 times, the rads Le inner wall, generation of MGA 1 ₂ 〇 _four layers was confirmed.

As a control, it was subjected to a similar injection discharge step at A 1 ₂ 0 ₃ layer formed prior to the A 1 ₂ T i 0 ₅ ceramic ladle, adhesion of the melt was observed at about 2000 times.

(3) Sealability of the joined body with the joint

Hiichi Each member of the joined body set of A 1 ₂ Ti 0 ₅ ceramics with A 1 0 ₂ ₃ layers is fitted together at the joining portion to form a joined body, and the outer periphery of the joined portion is an alumina fiber sheet (Mitsui Mining) It was tightened with a stainless steel band (width 2 Omm) via Material Co., Ltd., trade name: ALMAX). After the aluminum alloy lump (A4C) was put inside the joined body, the temperature was increased to 720 (20 ° C / min) and melted in an argon atmosphere (flow rate 100 cZmin). After dissolution, the temperature was kept at 720 for 1 hour, and the process of lowering the temperature (20ΤΖηίη) was repeated 50 times.

As a result, during this repetition process, no molten metal leak was observed from the joint site. In addition, no adhesion of the molten metal was found at the molten metal contact site on the inner wall of the joined body, and it was confirmed that good non-wetting property was maintained. Note that the molten metal contact portion of the joint body part, it was confirmed that MgA 1 ₂ 0 ₄ layer is formed on the surface.

ADVANTAGE OF THE INVENTION According to this invention, provision and maintenance of the non-wetting property with respect to a molten aluminum alloy of aluminum titanate ceramics are easily achieved.

[Industrial applicability]

INDUSTRIAL APPLICATION This invention can be utilized in the industrial field which manufactures the process or apparatus which conveys and measures a molten metal, or produces a solid with a molten metal.

Claims

The scope of the claims

1. An electromagnetic pump type molten metal supply device,

A conduit for conveying the molten metal with an electromagnetic pump,

A molten metal supply device comprising:

2. The molten metal supply device according to the item 1, wherein a rotation axis of the rotary blade is eccentrically arranged in the transport pipeline.

3. The rotating blade has a shaft and a blade provided on the shaft.

A convex portion fitted in a tapered fitting hole provided in the transport conduit; a through hole which penetrates the convex portion and into which the shaft can be fitted;

3. The molten metal supply device according to 1 or 2, which is attached to the transport conduit via a cap member having:

4. The molten metal supply device according to 3, wherein the cap member is clamped to the transfer conduit by a fastening member.

5. The molten metal supply device according to 4, wherein a tension is applied to the fastening member so that thermal expansion of the fastening member can be offset.

6. The molten metal supply device according to any one of 1 to 5, wherein the transport conduit includes a means for detecting the amount of molten metal in the transport conduit.

7. The molten metal supply device according to any one of 1 to 6, wherein the rotary blade is mainly made of aluminum titanate.

8. A method for producing molten material by supplying molten metal using an electromagnetic pump, comprising a rotating blade in a conveying pipe for transporting the molten metal to a manufacturing cavity, and detecting a rotation speed of the rotating blade. And

A method of controlling the supply amount of the molten metal by the rotation speed.

9. A metering device for an electromagnetic pump type molten metal supply device,

Rotating blades provided in a molten metal conveying pipe and rotated with the movement of the molten metal; A detector for detecting the number of rotations of the rotating blades,

An apparatus comprising:

10. The weighing device according to 9, wherein the weighing device is provided in the transport pipeline, and further includes means for detecting an amount of molten metal in the transport pipeline.

1 1. A manufacturing apparatus comprising the molten metal supply apparatus according to any one of! To 7.

12. An aluminum alloy molten metal contact member made of aluminum titanate ceramics,

A portion in contact with at least the molten aluminum alloy, A 1 ₂ 0 _3, containing one or more kinds of components selected from the group consisting of Mg_〇 and MGA 1 ₂ 0 _4, wherein the aluminum titanate ceramics group A member with a layer containing less Si than the material.

13. A contact member for molten aluminum alloy made of aluminum titanate ceramics,

A member comprising an aluminum titanate layer having a Si content lower than that of the aluminum titanate ceramics base material at least in a portion in contact with the aluminum alloy melt.

14. An aluminum alloy 錶 apparatus equipped with the alloy melt contact member according to 12 or 13.

15. A method for producing an aluminum alloy molten metal contact member made of aluminum titanate ceramics,

A portion in contact with at least an aluminum alloy melt of aluminum titanate ceramic member, contain one or more members selected from the group consisting of A 1 ₂ 0 _3, MgO and A 1 ₂ T i 0 _5, wherein Forming a layer having a lower Si content than a substrate made of aluminum titanate ceramics;

A 1 ₂ 0 _3, MgO Oyopin or A 1 ₂ T i 0 ₅ is for work magnesium and or aluminum titanium Sana Le mini © arm ceramic member comprising a layer containing by MgA 1 ₂ 0 ₄ Generating a,

A method comprising:

16. A method for manufacturing an aluminum alloy molten metal contact member, A portion in contact with at least the molten aluminum alloy, A l ₂ 〇 _3, MgO and A 1 contains ₂ T I_〇 one or more members selected from the group consisting of _5, the titanium aluminum ceramics group An aluminum alloy contact member made of aluminum titanate ceramic having a layer having a lower Si content than a material is brought into contact with a magnesium-containing aluminum alloy melt in at least a part of the aluminum alloy fabrication process. the a 1 ₂ 0 _3, step of generating a MgA 1 ₂ 0 ₄ in the MgO and Z or a 1 ₂ T i 0 ₅ a layer having free,

A method comprising:

17. A method for manufacturing an aluminum alloy molten metal contact member,

Shall apply at the site where two or more members made of titanate Arumini © beam ceramics are joined, in a zone that is in contact with at least the molten aluminum alloy, consisting of A 1 ₂ 0 _3, MgO and A 1 ₂ T i 0 ₅ The aluminum titanate ceramics base material made of one or more selected from the group, and the aluminum titanate ceramic base material also includes a layer having a low Si content. in at least some of銬造process of aluminum alloy, in contact with the molten aluminum alloy containing Mg, MGA 1 ₂ 〇 ₄ in a 1 ₂ 0 _3, MgO and or containing layers a 1 ₂ T i 0 ₅ Generating a,

A method comprising:

18. A method of manufacturing aluminum alloy products,

A portion in contact with at least the molten aluminum alloy, A 1 ₂ 0 _3, MgO and A 1 ₂ T i 0 1 kind selected from the group consisting of ₅ or comprise two or more, the titanium aluminum ceramics group The aluminum titanium alloy melt contact member made of aluminum titanate ceramics, which has a layer with a lower Si content than the aluminum alloy, is used in at least a part of the aluminum alloy fabrication process to convert the Mg-containing aluminum alloy melt. in contact, wherein a 1 ₂ 0 _3, ^ [8_Rei Oyobi or eight 1 ₂ T I_〇 ₅ step of generating a MgA 1 ₂ 0 ₄ in the containing layer,

And having a method.