JP2004249513A - Method and apparatus for extrusion molding of ceramic sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To precisely mold an extremely thin pipe-shaped molded object for use in the highly precise molding of an extremely thin sheet. <P>SOLUTION: A ceramic body is extruded in a pipe shape by an extrusion molding method and the formed pipe-shaped extrudate is cut open axially to be molded into a sheetlike shape. This ceramic sheet extrusion molding method is controlled so as to uniformize the flow rate of the ceramic body flowing to the annular molding region of a die for forming a ceramic molded object in extruding the ceramic body in the pipe shape from the die to extrude the ceramic body. By this constitution, the pipe-shaped ceramic molded object is molded. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for extruding a ceramic sheet, and more particularly to a method and an apparatus for manufacturing an ultra-thin, high-precision ceramic sheet used for, for example, an electrolyte or a separator of a fuel cell by the extrusion method. It is.
[0002]
[Prior art]
2. Description of the Related Art In recent years, research and development and commercialization of fuel cells have been actively carried out. Thin and high-precision ceramic sheets have been used for electrolytes and separators.
[0003]
Patent Document 1 discloses, as a method for producing fiber-reinforced cement, a technique in which cement is extruded into a pipe shape by an extrusion molding method, and at the same time, is cut in the axial direction and spread in a sheet shape.
[0004]
[Patent Document 1]
JP-A-62-90204
[Problems to be solved by the invention]
However, the technique disclosed in Patent Literature 1 is a sheet-like molding method of extremely thick cement having a thickness of about 20 mm. In the sheet-like molding method disclosed in Patent Literature 1, for example, an electrolyte or a separator of a fuel cell is used. While maintaining high precision enough to satisfy the standard of 0.1 to 1.5 mm ± 0.05 mm for lanthanum-based materials and zirconia-based materials, etc., required when using such as swelling, cutting, bending It was difficult to obtain a ceramic sheet free from defects.
[0006]
In other words, the technique disclosed in Patent Document 1 in which the cement is extruded into a pipe shape and simultaneously cut in the axial direction and spread in a sheet shape is applied to an extremely thin ceramic sheet having a thickness of 0.1 to 1.5 mm ± 0.05 mm. Even if it is diverted and manufactured, as shown in FIG. 16, undulations 53 occur in a pipe-shaped ceramic molded body 52 extruded from a pipe-forming die 51 in a stage before being spread into a sheet shape, and as shown in FIG. However, the ceramic sheet was cut or bent, and it was not possible to form a high-precision ceramic sheet required for use in electrolytes and separators of fuel cells.
[0007]
In pursuit of the cause of undulation, breakage, and bending in the ceramic sheet, it was found that the extrusion pressure distribution was not uniform.The cause of undulation, breakage, and bending was due to variation in the extrusion flow rate. It was revealed to do.
[0008]
The present invention has been made in view of the above points, and has a technical improvement to a technique of extruding a cement disclosed in Patent Literature 1 in a pipe shape and simultaneously incising in the axial direction to spread the cement in a sheet shape. Although it cannot be considered when forming a sheet as thick as about 20 mm, it overcomes various technical defects such as undulation, cutting, and bending that occur when manufacturing an extremely thin ceramic sheet. Extrusion molding method of ceramic sheet that can continuously form ceramic sheet without undulation, cut and bend while maintaining high accuracy of thickness required for use of 0.1 to 1.5 mm ± 0.05 mm And an apparatus therefor.
[0009]
[Means for Solving the Problems]
For this purpose, the method for extruding a ceramic sheet according to the present invention is characterized in that, in the method for extruding a ceramic sheet into a pipe by extruding the ceramic clay into a pipe shape by the extrusion molding method and cutting the ceramic clay into an axial direction, the ceramic clay is extruded. In extruding the soil into a pipe shape with a mouthpiece, the flow rate of the ceramic clay flowing into the annular forming portion of the mouthpiece forming the ceramic body is controlled to be uniform and extruded, thereby forming a pipe-shaped ceramic body. It is characterized by doing so.
[0010]
The apparatus for extruding a ceramic sheet of the present invention includes a die for forming the ceramic clay into a pipe shape having a predetermined thickness, and extruding the ceramic clay to the die by an extrusion mechanism provided in a cylinder. In a ceramic sheet extruder that cuts out a pipe-shaped ceramic molded body that is injected from a die in the axial direction and forms it into a sheet shape, the ceramic is extruded by an extruding mechanism provided in a cylinder at an annular molding portion. A plurality of extrusion flow rate adjusting mechanisms for equalizing the extrusion flow rate of the kneaded clay are provided in the die, and are characterized in that a pipe-shaped ceramic molded body is formed.
[0011]
In addition, the ceramic sheet extrusion forming apparatus of the present invention includes a die for forming the ceramic clay into a pipe shape having a predetermined thickness, and extrudes the ceramic clay to the die by an extrusion mechanism provided in a cylinder. In a ceramic sheet extruder that cuts out a pipe-shaped ceramic molded body that is injected from a die in the axial direction and forms it into a sheet shape, the ceramic is extruded by an extruding mechanism provided in a cylinder at an annular molding portion. A plurality of extrusion flow rate adjusting mechanisms for equalizing the extrusion flow rate of the kneaded clay are provided in the die, and the extrusion of the ceramic kneading clay into a molding flow path for forming the ceramic kneading into a pipe-like shape having a predetermined thickness. A reservoir for equalizing the pressure is provided on the base to form a pipe-shaped ceramic molded body. It is characterized in that there was Unishi.
[0012]
When the extrusion molding of the ceramic sheet is performed in the horizontal direction, the die has a support jig for holding the ceramic molded body to be extruded at an injection portion thereof.
[0013]
In addition, the supporting jig is formed of a porous material whose cylindrical end is closed, and is sent through an air hole provided in a base and blown out from the surface of the porous material to form a ceramic material. The frictional resistance between the body and the support jig may be reduced, and a plurality of holes for blowing air are formed on the surface thereof, and the air blown out from the holes causes friction between the ceramic molded body and the support jig. The resistance may be reduced.
[0014]
When the extrusion of the ceramic sheet is performed in the horizontal direction, the supporting jig has an opening device at its tip end for continuously incising the ceramic molded body and spreading the ceramic molded body into a sheet.
[0015]
When the extrusion of the ceramic sheet is performed in the direction of gravity, a direction changing jig for changing the direction of extruding the ceramic clay from the horizontal direction to the direction of gravity is provided between the horizontal cylinder and the die.
[0016]
At this time, that is, when the extrusion of the ceramic sheet is performed in the direction of gravity, the die is provided with an opening device for continuously incising the ceramic molded body and spreading it in a sheet shape at the injection portion.
[0017]
By adjustment by the extrusion flow rate adjustment mechanism provided in the die, the extrusion flow rate of the ceramic clay is controlled so as to be uniform and extruded at the annular molding portion, and the pipe-shaped ceramic molded body at the stage before being spread into a sheet shape is formed. It is possible to suppress the occurrence of undulation, breakage, bending, and the like. Since the apparatus has the opening device, it is possible to continuously manufacture highly accurate ultra-thin ceramic sheets.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a sectional view showing an embodiment of a main part of an apparatus for extruding a ceramic sheet according to the present invention.
[0019]
In the figure, a screw 4 is provided inside a cylinder 4 which constitutes a tip portion of a flushing mechanism 3 for flushing a ceramic clay 1 into a die 2, and the rotation of the screw 5 causes the ceramic clay 1 to move into the die 2. Is washed away to the side.
[0020]
The conical body 8 is formed in the base 2 in such a manner that a cylindrical portion 7 having a flange 6 is recessed at the center of the tip of the shaft. At the base of the cone 8, a plurality of back holes 9 are formed on the same circle around the axis of the cone 8, and the ceramic clay 1 is connected to each of the back holes 9 to form a ceramic body in a pipe shape. An annular slit 11 of an annular forming portion formed in the body 10 is provided. Extrusion material reservoirs 12 are provided at connecting portions between the plurality of back holes 9 and the annular slits 11 so as to make the extrusion pressure uniform during molding. This reservoir 12 is not necessarily provided. The connection between the plurality of back holes 9 and the annular slit 11 and the reservoir 12 will be described later in detail.
[0021]
The flange 6 of the base 2 is fixed to a flange 13 provided on the cylinder 4 of the flushing mechanism 3. On the side of the base 2 opposite to the flushing mechanism 3, the shape of the pipe-shaped ceramic molded body 10 extruded from the annular slit 11 is prevented from being collapsed by its own weight, that is, the undulation or cutting caused by the shape deformation of the ceramic molded body 10. A cylindrical support jig 14 is attached so as not to bend.
[0022]
At the entrance of the back hole 9, that is, at the base of the cone 8, an extrusion flow rate adjusting mechanism 15 for adjusting the amount of the ceramic clay 1 flowing into the back hole 9 is arranged corresponding to each back hole 9. Is established. A screw 16 that is screwed into the screw hole formed at the entrance of the back hole 9, that is, at the root position of the cone 8, is used as the extrusion flow rate adjusting mechanism 15. Of the ceramic clay 1 flowing into the back hole 9 can be finely adjusted.
[0023]
By providing each of the extrusion flow rate adjusting mechanisms 15 corresponding to the plurality of back holes 9, even if the fluidity of the extruded material is partially changed, the clay of the ceramic clay 1 flowing into the back holes 9 is formed. By rotating the screw 16 for adjusting the amount, the extruding speed of the extruded material ejected from the annular slit 11 can be made uniform over the entire annular slit 11, for example, a pipe having an extremely thin thickness of 0.5 to 1.5 mm. In the molding of the ceramic molded body 10 described above, it is possible to perform molding without undulation, bending, and cutting occurring due to uneven extrusion speed.
[0024]
FIG. 2 is an assembly view of an embodiment of a base provided with the extrusion flow rate adjusting mechanism of the present invention.
[0025]
In the figure, the base 2 includes a flange member 17, a flow rate adjusting member 18, an outer diameter forming member 19 and an inner diameter forming member 20, a screw 16 screwed to the flow rate adjusting member 18 and rotatably provided, and a cylinder. The four flanges 13 are provided with screws for integrally attaching the four flange members 17, the flow rate adjusting member 18, the outer diameter forming member 19, and the inner diameter forming member 20, and the like.
[0026]
The flange member 17 has a substantially annular shape to form the flange 6 shown in FIG.
[0027]
As shown in the cross-sectional view of the AOB in FIG. 4, the front view in FIG. 4, and the rear view in FIG. It has a shape including a body 8 and a disk portion 22 connected to the cone 8. At the base of the cone 8, a plurality of, in this embodiment, 18 back holes 9 are formed on the same circle around the axis of the cone 8, and correspond to each of these back holes 9, and Screw holes 23 are provided in each of the disk portions 22 radially from the center of the circular portion of the disk portion 22 so as to be located at the base position of the cone 8 formed in the center portion. The circular disk portion 22 opposite to the cone 8 is provided with a circular connecting groove 24 having a trapezoidal cross section which is connected to the plurality of back holes 9 provided on the same circle. The position where the circular connection groove 24 and each back hole 9 are connected and communicate with each other is called a connection portion. A fitting recess 25 is provided in the disk portion 22 and a screw hole 26 is cut in the center thereof. 27 is a mounting screw hole.
[0028]
The outer diameter forming member 19 has a ring shape as shown in a front sectional view of FIG. 6 and a right side view of FIG. In a hole 28 having a diameter D1 provided at the center of the outer diameter forming member 19, a tapered portion 29 is formed over the entire circumference of the hole 28 as shown in FIG. Reference numeral 30 denotes a mounting screw hole.
[0029]
As shown in the front sectional view of FIG. 8 and the right side view of FIG. 9, the inner diameter forming member 20 has a circular shape having a diameter D2, and is provided with a mounting screw hole 31 at a central portion. 3 has a fitting convex portion 32 which engages with the fitting concave portion 25 to form the annular slit 11, and two screw holes 33, and a tapered portion 34 is formed over the entire outer peripheral surface as shown in FIG. Have been.
[0030]
When the four flange members 17 having such a shape, the flow rate adjusting member 18, the outer diameter forming member 19, and the inner diameter forming member 20 are attached to the flange 13 of the cylinder 4 with screws for integrally attaching, the four integrated flanges The member 17, the flow rate adjusting member 18, the outer diameter forming member 19, and the inner diameter forming member 20 constitute the base 2 shown in FIG. However, the circular connecting groove of the disk portion 22 is formed by the connecting groove 24 having a trapezoidal cross section, the tapered portion 29 formed on the outer diameter forming member 19, and the tapered portion 34 formed on the inner diameter forming member 20 of the flow rate adjusting member 18. A spindle-shaped reservoir 12 is formed at a connection portion where the back hole 24 and each back hole 9 are connected to communicate with each other, and a hole 28 having a diameter D1 provided at the center of the outer diameter forming member 19 is formed as shown in FIG. The outer peripheral surface of the inner diameter forming member 20 having the diameter D2 forms an annular slit 11 that determines the thickness of the ceramic molded body 10. As is apparent from this description, the thickness of the ceramic molded body 10 can be freely set by changing the diameter D2 of the inner diameter forming member 20.
[0031]
FIG. 10 is an explanatory view of an embodiment of an opening jig for spreading a pipe-shaped ceramic molded body into a sheet.
[0032]
The opening jig 35 has a shape shown in FIG. 10, and one end 36 of the opening jig is connected to the supporting jig 14. A streamline-shaped portion 37 that expands in a tapered shape from one end 36 to the other end of the opening jig 35 is formed. When the ceramic molded body 10 formed into a pipe shape is extruded by the opening jig 35 and is continuously cut open by the cutter 38, the ceramic molded body 10 is gradually expanded by the streamline shape portion 37 expanding in a tapered shape, and expanded into a sheet shape. It has become.
[0033]
Since the blade of the cutter 38 cuts through an extremely thin ceramic molded body, the angle of the blade edge and the installation angle with respect to the ceramic molded body 10 are limited. That is, the angle of the cutting edge is desirably 0.1 to 0.3 degrees, and the installation angle with respect to the ceramic molded body 10 is desirably 10 to 20 degrees. Instead of the blade of the cutter 38, a piano wire can be set and cut.
[0034]
As described above, when cutting from a pipe shape to a sheet shape, the ceramic molded body 10 is always supported along the streamlined portion 37 that spreads in a tapered shape, and undulations that may occur when the shape is cut into the sheet. And bends can also be prevented.
[0035]
FIG. 11 briefly explains a process in which the ceramic clay 1 is formed into a sheet via a pipe-shaped ceramic molded body, using a main configuration diagram of a ceramic sheet extrusion forming apparatus according to the present invention.
[0036]
The ceramic clay 1 in the cylinder 4 is swept toward the base 2 by the rotation of the screw 5. The ceramic clay 1 introduced into the base 2 enters the corresponding back hole 9 through each flushing mechanism 3 and is temporarily stored in the reservoir 12, and then enters the annular slit 11, and then enters the pipe-shaped ceramic molded body. 10 is formed. The ceramic molded body 10 formed in a pipe shape by the annular slit 11 is extruded from the base 2 and further extruded while being supported by the cylindrical support jig 14. When the support jig 14 is cut open by a cutter 38 disposed at an appropriate position, the support jig 14 reaches the opening jig 35 provided in the next stage, and is gradually formed by the streamline-shaped portion 37 of the opening jig 35 that expands in a tapered shape. It can be spread and spread into sheets.
[0037]
Since these steps can be performed continuously, a continuous ceramic sheet can be manufactured, and a square or rectangular sheet can also be manufactured by automatically cutting to a desired size as needed.
[0038]
As can be understood from this description, the ceramic molded body 10 injected from the base 2 is held by the supporting jig 14 and the opening jig 35 so that the shape thereof is not lost.
[0039]
At the entrance of the back hole 9, that is, at the base of the cone 8, an extrusion flow rate adjusting mechanism 15 for adjusting the amount of the ceramic clay 1 flowing into the back hole 9 corresponding to each back hole 9 is provided. Since it is disposed, the entrance of the back hole 9 can be opened and closed by rotating the screw 16, and the amount of the ceramic clay 1 flowing into the back hole 9 can be finely adjusted. Even if the fluidity of the material is partially changed, the extrusion speed of the extruded material injected from the annular slit 11 is made uniform throughout the annular slit 11, that is, the difference in the extrusion pressure distribution of the ceramic clay 1 is eliminated. This makes it possible to form the pipe-shaped ceramic molded body 10 injected from the base 2 without undulation, bending, or cutting.
[0040]
FIG. 12 shows a main configuration diagram of another embodiment of a ceramic sheet extrusion forming apparatus according to the present invention.
[0041]
In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and the difference from FIG. 1 is that the material and the shape of the support jig 40 and the vent hole 41 is provided in the base 2. .
[0042]
The support jig 40 has a cylindrical shape with a closed end, and is made of a porous material having a large number of minute holes. When the air sent through the vent hole 41 provided in the base 2 is introduced into the support jig 40 of the porous material having many fine holes, the air of the porous material having many fine holes is removed. With the air blown from the surface, the frictional resistance between the ceramic molded body 10 and the support jig 40 is reduced, and the ceramic molded body 10 can be smoothly extruded without sticking to the surface of the support jig 40. The smooth extrusion without sticking to the surface of the support jig 40 can prevent the ceramic molded body 10 from undulating and bending.
[0043]
FIG. 13 is an explanatory view of another embodiment of the support jig.
[0044]
In the figure, the support jig 42 may be provided with a hole 43 to reduce frictional resistance. Further, the air blown out from the holes 43 reduces the frictional resistance between the ceramic molded body 10 and the support jig 42, and the ceramic molded body 10 can be smoothly extruded without sticking to the surface of the support jig 42. . The shape of the support jig 42 is, like the support jig 40 of FIG. 12, a cylindrical shape having a closed end. The support jig 42 having the holes 43 may be made of the same porous material as that of the support jig 40 of FIG. 12, or may be made of a general material. The same effect can be obtained if the shape of the hole 43 is not only a round hole but also an elongated square hole or a lattice.
[0045]
FIG. 14 is a main structural view of another embodiment of the ceramic sheet extrusion molding apparatus according to the present invention.
[0046]
In the figure, the same components as those in FIGS. 1 and 11 are denoted by the same reference numerals.
[0047]
14 is used when the extrusion of the ceramic sheet is performed in the direction of gravity. In FIGS. 1 and 11, the extrusion of the ceramic sheet is performed in the horizontal direction. Between them, there is provided a direction changing jig 44 for changing the extrusion direction of the ceramic clay 1 from the horizontal direction to the vertical direction, that is, the direction of gravity.
[0048]
In this case where the extrusion molding of the ceramic sheet is performed in the direction of gravity, the deformation due to its own weight is small, so that it is effective for forming an extremely thin thickness. The support jigs 14 and 40 shown in FIGS. 1 and 12 are omitted, and the opening jig 35 is directly attached to the base 2.
[0049]
FIG. 15 is a comparative explanatory view of one example with respect to the sheet thickness of a sheet formed by using the present invention.
[0050]
In the same figure, the result is an experiment performed on a lanthanum-based material or a zirconia-based material, and the circle indicates good, that is, a ceramic sheet without undulation, breakage, and bending can be formed. This indicates molding of a ceramic sheet in which at least one of defects, that is, undulation, breakage, and bending occurs.
[0051]
From FIG. 15, it was found that a sheet using the conventional technique without any limitation was limited to obtaining a sheet having a thickness of 5 mm. However, by using various apparatuses and jigs of the present invention, a sheet having a thickness of 0.2 mm was obtained. Could be realized.
[0052]
Further, the quality of sheet forming depending on the presence or absence of the extrusion flow rate adjusting mechanism is uneven in the extrusion flow rate described above. By providing the extrusion flow rate adjusting mechanism 15, the extrusion flow rate of the ceramic clay 1 is made uniform, This indicates that in the formation of the pipe-shaped ceramic molded body 10 injected from Step 2, molding without undulation, bending, and cutting is realized.
[0053]
The extruding flow rate adjusting mechanism 15 increases or decreases the area for blocking the inlet of the back hole 9 with the screw 16. However, the extruding flow rate adjusting mechanism 15 is not limited to the mechanism using the screw 16. Any mechanism may be used as long as it increases or decreases the area for closing the entrance.
[0054]
Although the description has been given of the lanthanum-based material and the zirconia-based ceramic as the extruding raw material, in addition to the lanthanum-based material and the zirconia-based material, general ceramics such as silicon nitride, silicon carbide, and alumina, and fuel cells are used. Nickel oxide, metallic nickel, nickel oxide / yttria stabilized zirconia (NiO-YSZ), nickel oxide / cerium samarium oxide (NiO-SDC), nickel oxide / cerium cadmium oxide (NiO-GDC), lanthanum strontium magnesium oxide, lanthanum Stronmanganite, lanthanum strontium cobaltite, lanthanum strontium gallium oxide, lanthanum strontium gallium magnesium cobaltite oxide, and samarium cobaltite are preferably used. That is, these are those selected appropriately in the embodiment of the present invention, but is not limited thereto.
[0055]
【The invention's effect】
As described above, according to the present invention, since the extrusion flow rate adjusting mechanism is provided so as to make the extrusion flow rate at the die uniform, the pipe-shaped ceramic molding injected from the die as a whole stage of spreading the sheet shape is provided. In the shaping of the body, undulation, bending, and cutting can be performed without interruption, and therefore, an ultrathin sheet without undulation, bending, and cutting can be formed with high precision.
[0056]
Since the supporting jig is provided at the injection portion of the die, the shape of the pipe-shaped ceramic molded body due to its own weight can be eliminated, and therefore, an extremely thin sheet without undulation, bending, and cutting can be formed with high precision. .
[0057]
Since a porous material was used for the support jig and air was blown out from the porous material, or a plurality of holes were provided on the surface of the support jig in contact with the pipe-shaped ceramic molded body, and air was blown out from the holes. Therefore, the pipe-shaped ceramic molded body does not stick to the support jig, the frictional resistance between the support jig and the pipe-shaped ceramic molded body is reduced, and the pipe-shaped ceramic molded body can be extruded smoothly. Therefore, an extremely thin sheet without undulation, bending, or cutting can be formed with high precision.
[0058]
When processing in the horizontal direction, by setting a cutter and opening jig at the end of the support jig, it is possible to cut open the pipe-shaped ceramic molded body continuously and spread it into a sheet shape, and continuous production of sheets can be performed. it can.
[0059]
On the other hand, when a direction changing jig is provided and the forming process in the gravitational direction is performed in which the ceramic clay which is flushed from the horizontal direction to the gravitational direction in the vertical direction flows into the die, the pipe-shaped ceramic molded body is deformed by its own weight. Therefore, the opening jig can be provided directly at the injection portion of the die without using a supporting jig, and a thinner sheet can be manufactured accurately and continuously.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of one embodiment of a main part of an apparatus for extruding a ceramic sheet according to the present invention.
FIG. 2 is an assembly drawing of an embodiment of a base provided with the extrusion flow rate adjusting mechanism of the present invention.
FIG. 3 is an AOB sectional view in FIG. 4;
FIG. 4 is a front view of a flow rate adjusting member.
FIG. 5 is a rear view of FIG.
FIG. 6 is a front sectional view of an outer diameter forming member.
FIG. 7 is a right side view of the outer diameter forming member.
FIG. 8 is a front sectional view of an inner diameter forming member.
FIG. 9 is a right side view of the inner diameter forming member.
FIG. 10 is an explanatory view of one embodiment of an opening jig for spreading a pipe-shaped ceramic molded body into a sheet shape.
FIG. 11 is a main configuration diagram of an apparatus for extruding a ceramic sheet according to the present invention.
FIG. 12 is a main configuration diagram of another embodiment of a ceramic sheet extrusion forming apparatus according to the present invention.
FIG. 13 is an explanatory view of another embodiment of the support jig.
FIG. 14 is a main configuration diagram of another embodiment of a ceramic sheet extrusion molding apparatus according to the present invention.
FIG. 15 is a diagram illustrating a comparative example of the sheet thickness of a sheet formed using the present invention.
FIG. 16 is an explanatory diagram of a sheet forming state by a conventional apparatus.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 ceramic clay 2 base 3 flushing mechanism 4 cylinder 5 screw 9 back hole 10 ceramic formed body 11 annular slit 12 reservoir 14 support jig 15 extrusion flow rate adjusting mechanism 16 screw

Claims (9)

In a method of extruding a ceramic sheet, the ceramic clay is extruded into a pipe shape by an extrusion method and cut in the axial direction, and the sheet is formed into a sheet shape.
In extruding the ceramic clay into a pipe shape with a die, the flow rate of the ceramic clay flowing through the annular forming portion of the die forming the ceramic molded body is controlled to be uniform and extruded,
A method for extruding a ceramic sheet, comprising forming a pipe-shaped ceramic molded body. Equipped with a die for molding the ceramic clay into a pipe-like shape having a predetermined thickness, and while extruding the ceramic clay to the die by an extrusion mechanism provided in a cylinder, a pipe-shaped ceramic molded body injected from the die is formed. In a ceramic sheet extrusion molding device that cuts in the axial direction and forms it into a sheet shape,
A plurality of extrusion flow rate adjustment mechanisms for equalizing the extrusion flow rate of the ceramic clay in the annular forming portion extruded by the extrusion mechanism provided in the cylinder are provided on the die,
An apparatus for extruding a ceramic sheet, wherein a pipe-shaped ceramic body is formed. Equipped with a die for molding the ceramic clay into a pipe-like shape having a predetermined thickness, and while extruding the ceramic clay to the die by an extrusion mechanism provided in a cylinder, a pipe-shaped ceramic molded body injected from the die is formed. In a ceramic sheet extrusion molding device that cuts in the axial direction and forms it into a sheet shape,
A plurality of extrusion flow rate adjustment mechanisms for equalizing the extrusion flow rate of the ceramic clay in the annular forming portion extruded by the extrusion mechanism provided in the cylinder are provided on the die,
A reservoir for equalizing the extrusion pressure of the ceramic clay is provided in the die in a molding flow path for molding the ceramic clay into a pipe shape having a predetermined thickness,
An apparatus for extruding a ceramic sheet, wherein a pipe-shaped ceramic body is formed. 4. The apparatus for extruding a ceramic sheet according to claim 2, wherein the die is provided with a support jig at an injection portion thereof for holding a ceramic molded body to be extruded. The support jig is a porous material whose cylindrical end is closed and made of a porous material, sent through a ventilation hole provided in a base, and blown out from the surface of the porous material with a ceramic molded body. The apparatus for extruding a ceramic sheet according to claim 4, wherein the frictional resistance with the supporting jig is reduced. The support jig is characterized in that a plurality of holes for blowing air are formed on the surface thereof, and the air blown out from the holes reduces frictional resistance between the ceramic molded body and the support jig. An apparatus for extruding a ceramic sheet according to claim 5. The ceramic sheet according to any one of claims 4 to 6, wherein the supporting jig is provided with an opening device at its tip end for continuously incising the ceramic molded body and spreading the sheet into a sheet shape. Extrusion molding equipment. The extrusion forming of the ceramic sheet according to claim 2 or 3, further comprising a direction changing jig between the cylinder and the die, the direction changing jig changing an extrusion direction of the ceramic clay from a horizontal direction to a gravity direction. apparatus. 9. The extrusion molding apparatus for a ceramic sheet according to claim 8, wherein the die is provided with an opening device for continuously incising a ceramic molded body and spreading the sheet into a sheet at an injection portion thereof.

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