Isostatic pressing forming die for porous long ceramic green body and using method of isostatic pressing forming die

Abstract

The invention discloses an isostatic pressing forming die for a porous long ceramic body and a using method of the isostatic pressing forming die, and belongs to the field of ceramic body isostatic pressing forming. The isostatic pressing forming die comprises a die rubber sleeve, a positioning rubber disc, a positioning ring, a pipeline positioning hole, a raw powder feeding opening, a granulation powder feeding opening and a steel pipe. Compared with the traditional technology that a steel core is pre-embedded or a solid blank is pressed by a mold and then is punched by machine equipment, the method has the advantages that the problems that the steel core is bent, deformed and difficult to pull out and the like possibly occurring in the traditional steel core pre-embedding mode are solved, the operation process is simplified, the production efficiency is improved, and the production cost is reduced. Meanwhile, the process that the raw powder is poked and loosened through a long rod to form the through hole is much simpler than the process that holes are directly punched in a solid body, the operation convenience is further improved, complex punching equipment is not needed, and the equipment investment cost is reduced; and meanwhile, the risk of damage to the green body is reduced, so that the cost of material waste is indirectly reduced.

Description

Technical Field

[0001] The invention relates to the field of isostatic pressing of ceramic green bodies, in particular to an isostatic pressing mold for porous long ceramic green bodies and a use method thereof. Background Art

[0002] It is difficult to perform isostatic pressing on porous ceramic bodies with long lengths. The isostatic pressing of porous ceramic bodies usually involves pre-embedding a steel core inside the mold, and then pulling out the steel core to form a hole after isostatic pressing. This method is simple and easy for single holes with the hole in the center, but it is more difficult to form porous and offset holes by pre-embedded steel cores. The steel core is easily bent due to uneven force, and is difficult to pull out after deformation. Pulling it out with force will cause the body to crack. It is also difficult to punch holes in a solid body after pressing it with a mold. Since the body is long, it is difficult to make a porous long body ceramic body without suitable punching equipment. Summary of the invention

[0003] The purpose of the present invention is to solve the problems raised in the background technology, and to design an isostatic pressing mold for a porous long ceramic body and a method for using the same.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is an isostatic pressing mold for porous long ceramic green bodies, comprising a mold rubber sleeve, a positioning rubber disc, a positioning ring, a pipeline positioning hole, a raw powder feeding port, a granulation powder feeding port, and a steel pipe. A positioning rubber disc is installed at one end of the mold rubber sleeve, and a positioning ring is installed at the other end of the mold rubber sleeve. The inner diameter of the mold rubber sleeve is consistent with the outer diameter of the positioning rubber disc. The positioning rubber disc is provided with a pipeline positioning hole, the positioning ring is provided with a raw powder feeding port, and the positioning ring is provided with a granulation powder feeding port. The shape and position of the pipeline positioning hole are consistent with the shape and position of the raw powder feeding port. The steel pipe passes through the raw powder feeding port and the end is inserted into the pipeline positioning hole. The size of the pipeline positioning hole is consistent with the size of the steel pipe.

[0005] Furthermore, a hanger is provided on the positioning ring, and the hanger is located at the edge of the positioning ring and fixedly connected to the positioning ring.

[0006] Furthermore, a plastic film is provided on the steel pipe, and the plastic film is sleeved on the steel pipe after a layer of lubricating oil is applied on the outer side of the steel pipe.

[0007] Furthermore, the cross-sectional dimension of the steel tube is the same as the cross-sectional dimension of the powder hole of the ceramic body.

[0008] A method for using an isostatic pressing mold for a porous long ceramic body comprises the following steps:

[0009] Step 1: Make a positioning ring according to the size and position of the powder hole and install it on one side of the mold rubber sleeve as the upper end. Make a steel pipe with stainless steel skin, and use the raw material powder adding port to position the upper end of the steel pipe. A positioning rubber disc is installed on the other end of the mold rubber sleeve, and a pipeline positioning hole is punched on the positioning rubber disc. Use the pipeline positioning hole to position the lower end of the steel pipe.

[0010] Step 2: After the mold is assembled, start adding materials. Use the granulation powder feeding port to fill the gap in the mold rubber sleeve with granulation powder, and fill the steel pipe with the same raw material powder as the granulation powder.

[0011] Step 3: Vibrate the mold on a vibration platform. After the powder is vibrated and compacted, quickly lift out the steel pipe while keeping it in the vibration state, and then seal the mold and put it into the isostatic press.

[0012] Step 4: Use a long rod with a metal tip to locate the original powder, poke and stir it to form multiple through holes on the ceramic blank.

[0013] Beneficial effects:

[0014] The present invention provides an isostatic pressing mold for porous long ceramic blanks and a method for using the same, which has the following beneficial effects. The device is designed to firstly make a positioning ring according to the size and position of the powder hole and install it on one side of the mold rubber sleeve as the upper end, make a steel pipe with stainless steel skin, and use the raw material powder feeding port to position the upper end of the steel pipe. A positioning rubber disc is installed at the other end of the mold rubber sleeve, and a pipeline positioning hole is punched on the positioning rubber disc. The lower end of the steel pipe is positioned using the pipeline positioning hole. Then, after the mold is assembled, the material is added. The granulation powder feeding port is used to fill the gap in the mold rubber sleeve with granulation powder, and the raw material powder same as the granulation powder is filled in the steel pipe. The mold is vibrated on a vibration platform. After the powder is vibrated and compacted, the steel pipe is quickly lifted out while maintaining the vibration state, and then the mold is sealed and placed in an isostatic press. Finally, the position of the original powder is accurately found with a long rod with a metal tip, and it is stirred while being poked to form multiple through holes on the ceramic blank. The through holes are polished to complete the forming of the porous long ceramic blank. Compared with the traditional technology of pre-embedded steel core or pressing a solid blank with a mold and then punching holes with a machine, the present invention avoids the problems of bending and deformation of the steel core that may occur in the traditional pre-embedded steel core method, which makes it difficult to extract the steel core, simplifies the operation process, and improves production efficiency. At the same time, the process of poking the original powder with a long rod to form through holes is much simpler than directly punching holes on the entity, which further improves the convenience of operation, does not require complicated punching equipment, and reduces the equipment investment cost; at the same time, since the risk of blank damage is reduced, the cost of material waste is also indirectly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an isostatic pressing mold for a porous long ceramic body according to the present invention;

[0016] Figure 2 It is an exploded structural diagram of an isostatic pressing mold for a porous long ceramic body according to the present invention;

[0017] Figure 3 It is a schematic diagram of forming the porous long ceramic body of the present invention.

[0018] In the figure, 1. mold rubber sleeve; 2. positioning rubber disc; 3. positioning ring; 4. pipeline positioning hole; 5. raw powder feeding port; 6. granulation powder feeding port; 7. steel pipe; 8. hanger; 9. plastic film. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "upper / lower end", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting / sleeving", "sleeve connection", "connection", etc. should be understood in a broad sense. For example, "connection" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See also Figure 1-2The present invention provides a technical solution: an isostatic pressing mold for a porous long ceramic body, comprising a mold rubber sleeve 1, a positioning rubber disc 2, a positioning ring 3, a pipeline positioning hole 4, a raw powder feeding port 5, a granulation powder feeding port 6, and a steel pipe 7. The mold rubber sleeve 1 is provided with a positioning rubber disc 2 at one end, and a positioning ring 3 is provided at the other end of the mold rubber sleeve 1. The inner diameter of the mold rubber sleeve 1 is consistent with the outer diameter of the positioning rubber disc 2. The positioning rubber disc 2 is provided with a pipeline positioning hole 4, the positioning ring 3 is provided with a raw powder feeding port 5, and the positioning ring 3 is provided with a granulation powder feeding port 6. The shape and position of the pipeline positioning hole 4 are consistent with the shape and position of the raw powder feeding port 5. The steel pipe 7 runs through the raw powder feeding port 5 and the end is inserted into the pipeline positioning hole 4. The size of the pipeline positioning hole 4 is consistent with the size of the steel pipe 7.

[0023] In the present invention, a hanger 8 is provided on the positioning ring 3, and the hanger 8 is located at the edge of the positioning ring 3 and is fixedly connected to the positioning ring 3. The hanger 8 on the positioning ring 3 can make it more convenient for the staff to hang the mold and move the mold.

[0024] In the present invention, a plastic film 9 is provided on the steel pipe 7. The plastic film 9 is sleeved on the steel pipe 7 after a layer of lubricating oil is applied on the outer side of the steel pipe 7. By applying a layer of lubricating oil on the outer side of the steel pipe 7 and then sleeved with a layer of plastic film 9, it is possible to prevent the steel pipe 7 from being pulled out for too long to cause mixing, and the steel pipe 7 can be lifted out as soon as possible without mixing.

[0025] In the present invention, the cross-sectional size of the steel tube 7 is the same as the cross-sectional size of the powder hole of the ceramic body, and the cross-sectional size of the steel tube 7 is used to control the size of the through hole of the ceramic body after forming.

[0026] See also Figure 1-3 The method for isostatically pressing a porous long ceramic body using the above mold comprises the following steps:

[0027] Step 1: Calculate the size of the powder hole according to the bulk density of the granulated powder of the porous long ceramic body to be produced, the size of the green body and the size of the inner hole, use stainless steel to make a thin-walled steel pipe 7 with the same cross-section as the hole and the same length as the mold, and weld a positioning ring 3 with steel parts according to the specific position of the powder hole as the upper end and install it on the upper end of the mold rubber sleeve 1. The raw powder feeding port 5 on the positioning ring 3 plays a positioning role on the upper end of the steel pipe 7. The positioning ring 3 is provided with a granulated powder feeding port 6 for subsequently feeding the granulated powder into the mold rubber sleeve 1. The other end of the mold rubber sleeve 1 is made of thick rubber to make a positioning rubber disc 2 and a pipeline positioning hole 4 is punched on the positioning rubber disc 2. The position of the pipeline positioning hole 4 is aligned with the raw powder feeding port 5 on the upper end positioning ring 3, which plays a positioning role on the lower end of the steel pipe 7.

[0028] Step 2: After the mold is assembled, start adding materials into the mold. Fill the gap in the mold rubber sleeve 1 with granulation powder from the granulation powder feeding port 6, and fill the steel pipe 7 with the same raw material powder as the granulation powder (the raw material powder without glue granulation is a lean material, and there will be no bonding effect between the particles after pressurization, which is easy to pick out later) to prevent contamination of the blank.

[0029] Step 3: Vibrate the mold on a vibration platform, and determine the vibration time according to different granulation powders. After the powder is vibrated and compacted, the steel tube 7 is quickly lifted out in a vibrating state, so that the granulation powder and the original powder filling the steel tube 7 are integrated. Because the lifting process of the steel tube 7 is short, the granulation powder and the original powder have similar particle sizes, and deep fusion will not occur in a short time, and there is a relatively clear interface. Then the mold is sealed and placed in an isostatic press.

[0030] Step 4: Make a long rod with a diameter smaller than the cross-sectional area of ​​the steel pipe 7, with a metal tip at the end for easy use. Place the pressed green blank on a flat plate and tilt it at a certain angle. Use the long rod with a metal tip to find the position of the raw powder, poke and stir it. After the raw powder is loosened, it can be easily taken out, and multiple through holes are formed on the ceramic blank. Since the force is not absolutely uniform, the shape and size of the through holes on the ceramic blank are not particularly regular. Due to the short-term mixing, some raw powder will also be stained on the hole wall. If manual hole repair is required, some common tools can be used, such as a long-pole electric drill, etc. Fix a wire brush or grinding wheel at the front section to simply grind the hole wall. After grinding, a porous long ceramic blank can be obtained.

[0031] In this embodiment: First, the size of the powder hole is calculated according to the bulk density of the granulated powder of the porous long ceramic body to be produced, the size of the green body and the size of the inner hole, and a thin-walled steel pipe 7 with the same cross-section as the hole and the same length as the mold is made of stainless steel. The stainless steel pipe has good corrosion resistance and can resist the erosion of the powder during the molding process, thereby ensuring the service life of the mold. The stainless steel surface is smooth and not easy to adhere to the powder, and it is easy to clean after molding. According to the specific position of the powder hole, a positioning ring 3 is welded with steel parts as the upper end and installed on the upper end of the mold rubber sleeve 1. The raw powder on the positioning ring 3 is added The port 5 plays a positioning role for the upper end of the steel pipe 7. The positioning ring 3 is provided with a granulation powder feeding port 6 for subsequently feeding the granulation powder into the mold rubber sleeve 1. The other end of the mold rubber sleeve 1 is made of thick rubber to make a positioning rubber disc 2 and a pipeline positioning hole 4 is punched on the positioning rubber disc 2. The position of the pipeline positioning hole 4 is aligned with the original powder feeding port 5 on the upper end positioning ring 3, which plays a positioning role for the lower end of the steel pipe 7. The positioning rubber disc 2 made of thick rubber has good flexibility and elasticity, can fit tightly against the lower end of the mold rubber sleeve 1, and form an effective seal to prevent the granulation powder from leaking from the bottom during the feeding process, thereby ensuring a smooth filling process.

[0032] After the mold is assembled, you can start to add materials to the inside of the mold. Fill the gap in the mold rubber sleeve 1 with granulation powder from the granulation powder feeding port 6, and fill the steel pipe 7 with the same raw material powder as the granulation powder (the raw material powder without glue granulation is a lean material, and there will be no bonding effect between the particles after pressurization, and it is easy to pick out later) to prevent contamination of the blank. Vibrate the mold on a vibration platform, and determine the vibration time according to different granulation powders. After the powder is vibrated and compacted, keep the steel pipe 7 in a vibrating state and quickly hang it out, so that the granulation powder and the original powder filling the inside of the steel pipe 7 are integrated. Because the steel pipe 7 is hung out for a short time, the granulation powder and the original powder are similar in particle size, and no deep fusion will occur in a short time, and there is a relatively clear interface. If the length of the blank is too large or the gap between the holes is too small, in order to prevent the steel pipe 7 from being pulled out for too long and causing mixing, a layer of lubricating oil can be applied to the outside of the steel pipe 7 and then a layer of plastic film 9 can be put on to facilitate the steel pipe 7 to be hung out as soon as possible without mixing. The mold is then sealed and placed in an isostatic press. The hanger 8 on the positioning ring 3 can make it more convenient for workers to hang the mold and move the mold.

[0033] Finally, make a long rod with a diameter smaller than the cross-sectional area of ​​the steel pipe 7 and a metal tip at the end for easy use. Place the pressed green blank on a flat plate and tilt it at a certain angle. Use the prepared long rod with a metal tip to find the position of the raw powder, poke and stir it at the same time. After the raw powder is loosened, it can be easily taken out, and multiple through holes are formed on the ceramic blank. Since the force is not absolutely uniform, the shape and size of the through holes on the ceramic blank are not particularly regular. Due to the short-term mixing, some raw powder will also be stained on the hole wall. If manual hole repair is required, some common tools can be used, such as a long-pole electric drill, etc., and a wire brush or grinding wheel can be fixed at the front section to simply grind the hole wall. Compared with the traditional technology, it is much easier to use machinery and equipment to punch holes after pressing into a solid blank.

[0034] Through the above operations, we can get Figure 3 The porous ceramic long blank is shown.

[0035] It should be noted that, in this article, 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 a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An isostatic pressing mold for a porous long ceramic body, comprising a mold rubber sleeve (1), a positioning rubber disc (2), a positioning ring (3), a pipeline positioning hole (4), a raw powder feeding port (5), a granulation powder feeding port (6), and a steel pipe (7), characterized in that: A positioning rubber disc (2) is installed at one end of the mold rubber sleeve (1), and a positioning ring (3) is installed at the other end of the mold rubber sleeve (1). The inner diameter of the mold rubber sleeve (1) is consistent with the outer diameter of the positioning rubber disc (2). The positioning rubber disc (2) is provided with a pipeline positioning hole (4), the positioning ring (3) is provided with a raw powder feeding port (5), and the positioning ring (3) is provided with a granulated powder feeding port (6). The shape and position of the pipeline positioning hole (4) are consistent with the shape and position of the raw powder feeding port (5). The steel pipe (7) passes through the raw powder feeding port (5) and the end thereof is inserted into the pipeline positioning hole (4). The size of the pipeline positioning hole (4) is consistent with the size of the steel pipe (7).

2. The isostatic pressing mold for a porous long ceramic body according to claim 1, characterized in that: A sling (8) is provided on the positioning ring (3); the sling (8) is located at the edge of the positioning ring (3) and is fixedly connected to the positioning ring (3).

3. The isostatic pressing mold for a porous long ceramic body according to claim 1, characterized in that: The steel pipe (7) is provided with a plastic film (9), and the plastic film (9) is sleeved on the steel pipe (7) after a layer of lubricating oil is applied to the outer side of the steel pipe (7).

4. The isostatic pressing mold for a porous long ceramic body according to claim 1, characterized in that: The cross-sectional dimensions of the steel tube (7) are the same as the cross-sectional dimensions of the powder holes of the ceramic body.

5. A method for using the isostatic pressing mold for a porous long ceramic body as claimed in any one of claims 1 to 4, characterized in that: The method of use comprises the following steps: Step 1: A positioning ring (3) is made according to the size and position of the powder hole and installed on one side of the mold rubber sleeve (1) as the upper end, a steel pipe (7) is made of stainless steel, and the upper end of the steel pipe (7) is positioned using the raw material powder feeding port. A positioning rubber disc (2) is installed on the other end of the mold rubber sleeve (1), and a pipeline positioning hole (4) is drilled on the positioning rubber disc (2). The lower end of the steel pipe (7) is positioned using the pipeline positioning hole (4); Step 2: After the mold is assembled, start adding materials, use the granulation powder feeding port (6) to fill the gap in the mold rubber sleeve (1) with granulation powder, and fill the steel pipe (7) with raw material powder that is the same as the granulation powder; Step 3: Vibrate the mold on a vibration platform. After the powder is vibrated and compacted, the steel pipe (7) is quickly lifted out while maintaining the vibration state, and then the mold is sealed and placed in an isostatic press; Step 4: Use a long rod with a metal tip to locate the original powder, poke and stir it to form multiple through holes on the ceramic blank.

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