Isostatic pressing forming die and system for ceramic tube and forming method of ceramic tube

Abstract

The embodiment of the invention discloses a ceramic tube isostatic pressing forming mold and system and a forming method of a ceramic tube. The mold comprises a rigid shell with an inner cavity, wherein the top and the bottom of the rigid shell are open; the rigid inner mold is arranged in an inner cavity of the rigid shell; the flexible sleeve is arranged between the rigid shell and the rigid inner mold; an accommodating cavity for accommodating ceramic powder can be formed between the flexible sleeve and the rigid inner mold; and the sealing element is used for blocking the bottom of the accommodating cavity. According to the forming system, the rigid shell, the flexible sleeve and the rigid inner mold are coaxial, ceramic powder filled into the containing cavity in a vibration mode is more uniform and compact, and therefore the straightness and wall thickness consistency of the ceramic tube blank are improved, meanwhile, after the ceramic tube is demolded, the rigid inner mold is easy to demold after isostatic pressing forming, and the forming quality is improved. The ratio of the length to the outer diameter of the manufactured ceramic tube can exceed 50, and the inner diameter of the manufactured ceramic tube can reach 3mm.

Description

Technical Field

[0001] The present application relates to the technical field of ceramic tube preparation, and more specifically, to a ceramic tube isostatic pressing mold, a system and a ceramic tube forming method. Background Art

[0002] The corona pre-ionization electrode in the gas excimer laser usually uses a ceramic tube as an insulating medium. The ratio of the length of the ceramic tube to its diameter is relatively large, and its length reaches 600-700mm. The ratio of the length of the ceramic tube to the outer diameter exceeds 50. In the prior art, for this type of ceramic tube, an extrusion molding method is usually adopted for its production, that is, firstly, ceramic powder is mixed with a large amount of liquid adhesive to form a ceramic mud material, and then the ceramic mud material is put into a mold, and extruded from the mold under a certain pressure to obtain a ceramic tube blank. However, due to the special application environment of this type of ceramic tube, particularly high requirements are placed on the purity of the ceramic tube itself and the content of certain impurities. In addition, the extrusion molding method requires the use of a large amount of binder, and it is not easy to control the impurity content of the ceramic tube product. At the same time, a large number of pores are likely to remain inside the formed ceramic tube blank, which affects the plasma and chemical corrosion resistance of the ceramic tube, and thus affects the service life. Summary of the invention

[0003] The object of the present invention is to provide a ceramic tube isostatic pressing mold, system and ceramic tube forming method to solve at least one of the above technical problems.

[0004] In order to achieve at least one of the above purposes, the present application adopts the following technical solutions:

[0005] The first aspect of the present application provides a ceramic tube isostatic pressing mold, comprising:

[0006] A rigid housing having an interior cavity and being open at the top and bottom;

[0007] a rigid inner mold for being disposed in the inner cavity of the rigid outer shell;

[0008] A flexible sleeve for being disposed between the rigid outer shell and the rigid inner mold;

[0009] The flexible sleeve and the rigid inner mold may form a receiving cavity for receiving ceramic powder; and

[0010] A sealing member is used to seal the bottom of the accommodating cavity.

[0011] Optionally, the top of the flexible sleeve may extend to the outside of the top of the rigid shell;

[0012] The length of the rigid inner mold is greater than the length of the rigid outer shell.

[0013] Optionally, the mold further comprises a filler member provided with a material passing through hole, the outer diameter of which is configured to be in close contact with the inner wall of the rigid shell through the flexible sleeve.

[0014] Optionally, the sealing member includes a slot at a center position for inserting the rigid inner mold.

[0015] Optionally, the rigid shell includes a shell body; and

[0016] A shell connecting portion located at the bottom side of the shell main body and connected to the main body;

[0017] The radial dimension of the shell connecting portion is greater than the radial dimension of the shell main body portion.

[0018] Optionally, the flexible sleeve comprises a flexible main body portion; and

[0019] a flexible connection portion located at the bottom side of the flexible main body portion and communicating with the flexible main body portion;

[0020] The radial dimension of the flexible connection portion is greater than the radial dimension of the flexible main body portion.

[0021] A second aspect of the present application provides a ceramic tube isostatic pressing system, comprising:

[0022] The ceramic tube isostatic pressing die provided in the first aspect above;

[0023] A vibration table, comprising a table surface for fixing and supporting the isostatic pressing mold of the ceramic tube; and

[0024] An eccentric motor for vibrating the vibration table.

[0025] Optionally, the bottom edge of the rigid shell extends outward to form an extension plate;

[0026] The extension plate may be fixedly connected to the vibration table via a fixing member.

[0027] A third aspect of the present application provides a method for forming a ceramic tube, comprising:

[0028] The bottom of the accommodating cavity of the flexible sleeve is sealed with a sealing member, and the rigid inner mold is inserted into the sealing member to obtain an inner mold assembly;

[0029] Inserting the inner mold assembly into the inner cavity of the rigid outer shell, with the top of the rigid inner mold exceeding the top of the rigid outer shell;

[0030] The rigid shell is fixed on the table surface of the vibration table. The vibration table vibrates under the action of the eccentric motor. When the vibration table vibrates, ceramic powder is filled into the accommodating cavity formed between the flexible sleeve and the rigid inner mold to form a ceramic tube blank.

[0031] Optionally, the method further comprises

[0032] The bottom of the accommodating cavity of the flexible sleeve is sealed with a sealing member, the rigid inner mold is inserted into the sealing member, and a filler member is installed between the rigid inner film and the top of the flexible sleeve to obtain the inner mold assembly.

[0033] The beneficial effects of this application are as follows:

[0034] 1. The ceramic tube isostatic pressing mold of the present application is designed such that the flexible sleeve is located between the rigid outer shell and the rigid inner mold, so that the ceramic powder can be buffered in the process of being placed in the accommodating cavity; the use of the rigid outer shell supports the flexible sleeve and does not deform the flexible sleeve, and the straightness of the ceramic tube blank can be ensured in the process of filling the accommodating cavity with ceramic powder to form a ceramic tube blank. The sealing member blocks the bottom of the accommodating cavity so that the ceramic powder does not leak out.

[0035] In the forming mold provided by the present application, both the flexible sleeve and the rigid outer shell provide a connection portion with a diameter greater than the diameter of the ceramic tube, so that the ceramic powder entering the mold at the beginning of filling can be evenly distributed along the circumference, avoiding the accumulation of ceramic powder at different positions when forming a small-diameter ceramic tube, and introducing defects such as micropores. At the same time, the ceramic tube blank obtained by homogenization filling can be evenly distributed along the axial stress. The rigid outer shell, flexible sleeve and rigid inner mold of the forming mold of the present application are coaxial, and are filled into the accommodating cavity by vibration. The ceramic powder is more uniform and dense, thereby improving the straightness and wall thickness consistency of the ceramic tube blank. After isostatic pressing, the rigid inner mold is easy to come out, and the ratio of the length to the outer diameter of the produced ceramic tube can exceed 50, and the inner diameter can reach 3mm.

[0036] 2. In the ceramic tube isostatic pressing system of the present application, the vibration table vibrates while the ceramic powder is put into the accommodating cavity, which can reduce the gaps between the ceramic powders and the density of the formed ceramic tube blank will be greater.

[0037] 3. In the ceramic tube forming method of the present application, a small amount of organic binder is doped into the ceramic powder, and the purity and density of the finally prepared ceramic tube are relatively high, and it is easy to control the impurity content of the ceramic tube product. At the same time, there are almost no pores inside the formed ceramic tube blank, which greatly improves the plasma and chemical corrosion resistance of the ceramic tube and increases the service life of the ceramic tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0039] Figure 1 A schematic diagram showing the overall structure of an isostatic pressing mold for a ceramic tube in one embodiment of the present application is shown.

[0040] Figure 2 Show Figure 1Enlarged view of part A.

[0041] Figure 3 A top view of a filler member of an isostatic pressing die for a ceramic tube in one embodiment of the present application is shown.

[0042] Figure 4 Show Figure 3 Longitudinal cross-section of AA. DETAILED DESCRIPTION

[0043] In the following description, for the purpose of explanation, in order to provide a thorough understanding of one or more embodiments, numerous specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details.

[0044] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0045] It should also be noted that, in the description of the present application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0046] In order to solve the problems existing in the prior art, an embodiment of the present application provides a ceramic tube isostatic pressing mold, such as Figure 1-4As shown, it includes a rigid shell 1 with an inner cavity and open top and bottom; its inner diameter can be 32mm, outer diameter can be 38mm, length can be 930mm, and the material is stainless steel; a rigid inner mold 3 is used to be set in the inner cavity of the rigid shell 1; the rigid inner mold 3 can be an inner steel film, made of one of tungsten steel, ceramic, and high-rigidity metal alloy, the diameter of the rigid inner mold 3 is 3-8mm, preferably 7mm, and the length can be 1000mm; a flexible sleeve is used to be set between the rigid shell 1 and the rigid inner mold 3; the flexible sleeve is made of rubber, the outer diameter can be 30-31mm, the inner diameter can be 26-28mm, and the length can be 950mm; the flexible sleeve can form a receiving cavity 4 for receiving ceramic powder between the flexible sleeve and the rigid inner mold 3, and a sealing member 6 for blocking the bottom of the receiving cavity 4. The material of the sealing member 6 is vacuum rubber; the ceramic powder is integrally formed in the receiving cavity 4 by cold isostatic pressing. The formed ceramic tube can form a tubular structure with a length to outer diameter ratio greater than or equal to 50. Of course, a tubular structure with a length to outer diameter ratio less than 50 can also be made. In practical applications, a small amount of organic binder is doped in the ceramic powder. Compared with the prior art, the amount of doped binder is greatly reduced, and the density of the formed ceramic tube is higher, and the impurity content of the ceramic tube is easy to control.

[0047] In the above-mentioned embodiment provided by the present application, the design of the flexible sleeve between the rigid outer shell 1 and the rigid inner mold 3 can play a buffering role for the ceramic powder in the process of placing the ceramic powder in the accommodating cavity 4; the use of the rigid outer shell 1 plays a supporting role for the flexible sleeve, and will not deform the flexible sleeve, and can ensure the straightness of the ceramic tube blank formed in the process of filling the ceramic powder into the accommodating cavity 4 to form a ceramic tube blank. The seal 6 blocks the bottom of the accommodating cavity 4 so that the ceramic powder will not leak out. In the ceramic tube isostatic pressing mold provided by the present application, the rigid outer shell 1, the flexible sleeve and the rigid inner mold 3 are coaxial, and are filled into the accommodating cavity 4 by vibration. The ceramic powder is more uniform and dense, thereby improving the straightness and wall thickness consistency of the ceramic tube blank. After isostatic pressing, the rigid inner mold 3 is easy to come out, and the ratio of the length to the outer diameter of the produced ceramic tube can exceed 50, and the inner diameter can reach 3mm.

[0048] In a specific embodiment, the rigid shell 1 includes a shell body 11; and a shell connection part 12 located at the bottom side of the shell body 11 and connected to the shell body 11; the radial dimension of the shell connection part 12 is greater than the radial dimension of the shell body 11. In order to enable the flexible sleeve to adapt to the rigid shell 1, the flexible sleeve includes a flexible body 21; and a flexible connection part 22 located at the bottom side of the flexible body 21 and connected to the flexible body 21; the radial dimension of the flexible connection part 22 is greater than the radial dimension of the flexible body 21. Since the formed ceramic tube needs to be sintered, the radial dimension of the shell connection part 12 is greater than the radial dimension of the shell body 11, and the radial dimension of the flexible connection part 22 is greater than the radial dimension of the flexible body 21, so that the finally formed ceramic tube also has a tube body main part and a tube body connection part located at the bottom side of the tube body main part and connected to the tube body main part. The tube body connection part can make the ceramic powder entering the mold at the beginning of filling evenly distributed along the circumference, avoid the accumulation of ceramic powder at different positions when forming a small-diameter ceramic tube and introduce defects such as micropores, and at the same time can make the ceramic tube blank obtained by homogenization and filling evenly distributed along the axial stress. When the finally formed ceramic tube is sintered, the connection between the main body of the tube body and the tube body connection part can be hung by a hanging rope so that the main body of the tube body is downward relative to the main body connection part, which is convenient for sintering.

[0049] In a specific embodiment, the top of the flexible sleeve extends to the outside of the top of the rigid shell 1, exceeding the rigid shell by 10 to 20 mm, so that after the ceramic tube blank is formed, the flexible sleeve can be easily removed from the rigid shell 1; the bottom of the flexible sleeve is located inside the rigid shell 1, and the seal 6 can be flush with the bottom of the rigid shell 1, so that the rigid shell 1 can be easily installed on the table of the vibration table 5. The length of the rigid inner mold 3 is greater than the length of the rigid shell 1. Furthermore, the top of the rigid inner mold 3 extends to the outside of the top of the flexible sleeve to facilitate the separation of the rigid inner mold 3 from the ceramic tube after the ceramic tube is formed.

[0050] In a specific example, the mold further includes a filler 7 provided with a material passing through hole 72, and its outer diameter is set to be in close contact with the inner wall of the rigid shell 1 through the flexible sleeve. The material of the filler 7 is polytetrafluoroethylene. Since the flexible sleeve is relatively flexible, it is not convenient to directly fill the ceramic powder in the accommodating cavity 4. The use of the filler 7 can make the top of the flexible sleeve relatively fixed. In order to reduce the gap between the ceramic powders, the density of the formed ceramic tube blank is higher. In the process of filling the accommodating cavity 4 with ceramic powder, the entire mold is vibrated at the same time. During the vibration process, the use of the filler 7 prevents the top of the flexible sleeve from being deformed, and the filling is more convenient.

[0051] Furthermore, the filler 7 includes a through hole 71 located at the center thereof for the rigid inner mold 3 to pass through; at least two through holes 72 for passing materials are formed around the through hole 71. The design of the through hole 71 can fix the rigid inner mold 3 to ensure the uniformity and consistency of the formed ceramic tube blank. The partition 73 between two adjacent through holes 72 is connected to the arm body of the through hole 71, and can support the entire through hole 71.

[0052] In a specific embodiment, the seal 6 is provided at the bottom opening of the flexible sleeve; the center of the seal 6 includes a slot for inserting the rigid inner mold 3. The provision of the slot enables the rigid inner mold 3 to be fixed at the center of the flexible sleeve, further ensuring the uniformity and consistency of the formed ceramic tube blank.

[0053] Another embodiment of the present application also provides a ceramic tube isostatic pressing system, including the ceramic tube isostatic pressing mold as described above; a vibration table 5, including a table for fixing and supporting the ceramic tube isostatic pressing mold; and an eccentric motor 92 for vibrating the vibration table 5, specifically, the eccentric motor 92 is arranged between the base 91 and the vibration table 5, and the vibration frequency can be 50Hz. The top of the eccentric motor 92 is connected to the bottom surface of the vibration table 5. The vibration table 5 is driven to vibrate under the action of the eccentric motor 92.

[0054] In this embodiment, the vibration table 5 vibrates while the ceramic powder is put into the accommodating cavity 4, so that the gaps between the ceramic powders can be reduced and the density of the formed ceramic tube blank will be higher.

[0055] In a specific embodiment, the bottom edge of the rigid housing 1 extends outward to form an extension plate 13; the extension plate 13 can be fixedly connected to the vibration table 5 through a fixing member 14. Specifically, the fixing member 14 passes through the extension plate 13 and the vibration table 5 in sequence to connect the two to form a whole, so that the vibration table 5 can drive the ceramic powder in the accommodating cavity 4 to vibrate during the vibration process, and the formed ceramic tube blank is more uniform and dense. The fixing member 14 can be a bolt.

[0056] In a specific embodiment, the molding system further includes a base 91, and the base 91 is connected to the vibration table 5 through an elastic member 8. The base 91 can place the entire molding system on the ground, and the use of the elastic member 8 can make the vibration frequency of the vibration table 5 higher, and the elastic member 8 can be a spring.

[0057] Another embodiment of the present application also provides a method for forming a ceramic tube, comprising:

[0058] Step S1, using a seal 6 to seal the bottom of the accommodating cavity 4 of the flexible sleeve, inserting the rigid inner mold 3 into the seal 6 to obtain an inner mold assembly; the rigid inner mold 3 is located at the center of the flexible sleeve;

[0059] Step S2, insert the inner mold assembly into the inner cavity of the rigid outer shell 1, and the top of the rigid inner mold 3 exceeds the top of the rigid outer shell 1; use a seal 6 to seal the bottom of the accommodating cavity 4 of the flexible sleeve, insert the rigid inner mold 3 into the seal 6, and install a filler 7 between the rigid inner film 3 and the top of the flexible sleeve to obtain the inner mold assembly.

[0060] Step S3, fix the rigid shell 1 on the table surface of the vibration table 5, and the vibration table 5 vibrates under the action of the eccentric motor 92. When the vibration table 5 vibrates, ceramic powder is filled into the accommodating cavity formed between the flexible sleeve 3 and the rigid inner mold 3 to form a ceramic tube blank.

[0061] In the specific use process, first install the ceramic tube isostatic pressing mold on the vibration table 5, and then put ceramic powder into the accommodating cavity 4 formed between the flexible sleeve and the rigid inner mold 3 while the vibration table 5 is vibrating. When the ceramic powder fills the entire accommodating cavity 4, the vibration table 5 stops vibrating; replace the filler 7 with the seal 6, and then extract the inner mold assembly from the bottom of the rigid shell 1, and then insert it into the inner cavity of the rigid shell 1 from the top of the rigid shell 1. At this time, the part of the rigid inner mold 3 that exceeds the flexible outer sleeve is located in the inner cavity of the connecting part 12 of the rigid shell 1, and the part of the flexible sleeve located at the connecting part with a large diameter is located on the outside of the top of the rigid shell 1. After the installation is completed, continue to vibrate through the vibration table 5 to finally form a ceramic tube blank. In this way, the density of the formed ceramic tube blank in the length direction can be ensured to be more uniform, and the wall thickness consistency of the ceramic tube is further improved. It should be noted that since the ceramic powder is always in a vibrating state during the process of putting the ceramic powder into the accommodating cavity 4, the ceramic powder located at the connecting part 12 is relatively dense and hard at this time, so it will not be loose even if it is located on the outside of the top of the rigid shell 1.

[0062] Step S4, take out the inner mold assembly and the ceramic tube blank, and put them into a cold isostatic press to form a ceramic tube from the ceramic tube blank. Specifically, after forming, the flexible sleeve, the rigid inner mold 3 and the ceramic tube blank are taken out, and then the PVC sleeve is sleeved on the flexible sleeve and put into a cold isostatic press to form the ceramic tube. The pressure of the cold isostatic press can be 150MPa, and the pressure is maintained for 5min. After forming, the rigid inner mold 3, the flexible sleeve and the formed ceramic tube are separated, and then sintered. After sintering is completed, the main body of the ceramic tube and the connecting part of the tube body are separated, and finally the main body of the ceramic tube is formed. The aperture of the main body of the ceramic tube is 5 to 7mm. Here, when the ceramic tube blank is cold isostatically pressed in the cold isostatic press, the flexible sleeve can ensure that the rigid inner mold 3 is in the center of the flexible outer sleeve, and the rigid inner mold 3 will not bend. The wall thickness uniformity of the ceramic tube prepared in this way is better, the inner hole of the formed ceramic tube has a high straightness, and the rigid inner mold 3 will not bend and deform, which is convenient for demolding.

[0063] Isostatic pressing is to place the sample to be pressed in a high-pressure container, and use the incompressible nature of the liquid medium and the property of uniformly transmitting pressure to uniformly pressurize the sample from all directions. When the liquid medium is injected into the pressure container through a pressure pump, according to the principles of fluid mechanics, its pressure remains unchanged and is evenly transmitted in all directions. At this time, the pressure on the powder in the high-pressure container in all directions is uniform and consistent.

[0064] In practical applications, in order to make the rigid inner mold 3 easily detachable from the formed ceramic tube, a layer of oil can be applied on the outer wall of the rigid inner mold 3 before the rigid inner mold 3 is placed in the flexible sleeve to reduce the friction between the rigid inner mold 3 and the ceramic tube after forming.

[0065] Compared with the prior art, by using the ceramic tube forming method provided in the present application, a small amount of organic binder will be doped into the ceramic powder, and the purity and density of the finally prepared ceramic tube are relatively high, and it is easy to control the impurity content of the ceramic tube product. At the same time, there are almost no pores inside the formed ceramic tube blank, which greatly improves the plasma and chemical corrosion resistance of the ceramic tube and increases the service life of the ceramic tube.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A ceramic tube isostatic pressing die, characterized in that: include A rigid housing having an interior cavity and being open at the top and bottom; a rigid inner mold for being disposed in the inner cavity of the rigid outer shell; A flexible sleeve for being disposed between the rigid outer shell and the rigid inner mold; The flexible sleeve and the rigid inner mold may form a receiving cavity for receiving ceramic powder; as well as A sealing member is used to seal the bottom of the accommodating cavity.

2. The ceramic tube isostatic pressing mold according to claim 1, characterized in that: The top of the flexible sleeve may extend to the outside of the top of the rigid shell; The length of the rigid inner mold is greater than the length of the rigid outer shell.

3. The ceramic tube isostatic pressing mold according to claim 1, characterized in that: The mold further comprises a filler member provided with a material passing through hole, the outer diameter of which is configured to be in close contact with the inner wall of the rigid shell through the flexible sleeve.

4. The ceramic tube isostatic pressing mold according to claim 1, characterized in that: The sealing member comprises a slot at the center thereof for the rigid inner mold to be inserted.

5. The ceramic tube isostatic pressing mold according to claim 1, characterized in that: The rigid housing comprises a housing body; and A shell connecting portion located at the bottom side of the shell main body and connected to the main body; The radial dimension of the shell connecting portion is greater than the radial dimension of the shell main body portion.

6. The ceramic tube isostatic pressing die according to claim 5, characterized in that: The flexible sleeve includes a flexible main body portion; and a flexible connection portion located at the bottom side of the flexible main body portion and communicating with the flexible main body portion; The radial dimension of the flexible connection portion is greater than the radial dimension of the flexible main body portion.

7. A ceramic tube isostatic pressing system, characterized in that: include The isostatic pressing mold for ceramic tubes according to any one of claims 1 to 6; A vibration table, comprising a table surface for fixing and supporting the isostatic pressing mold of the ceramic tube; as well as An eccentric motor for vibrating the vibration table.

8. The ceramic tube isostatic pressing system according to claim 7, characterized in that: The bottom edge of the rigid shell extends outward to form an extension plate; The extension plate may be fixedly connected to the vibration table via a fixing member.

9. A method for forming a ceramic tube, characterized in that: include: The bottom of the accommodating cavity of the flexible sleeve is sealed with a sealing member, and the rigid inner mold is inserted into the sealing member to obtain an inner mold assembly; Inserting the inner mold assembly into the inner cavity of the rigid outer shell, with the top of the rigid inner mold exceeding the top of the rigid outer shell; The rigid shell is fixed on the table surface of the vibration table. The vibration table vibrates under the action of the eccentric motor. When the vibration table vibrates, ceramic powder is filled into the accommodating cavity formed between the flexible sleeve and the rigid inner mold to form a ceramic tube blank.

10. The method for forming a ceramic tube according to claim 9, characterized in that: The method also includes The bottom of the accommodating cavity of the flexible sleeve is sealed with a sealing member, the rigid inner mold is inserted into the sealing member, and a filler member is installed between the rigid inner film and the top of the flexible sleeve to obtain the inner mold assembly.

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