Isostatic pressing forming die for disc-shaped ceramic blank

Abstract

The utility model discloses an isostatic pressing forming die for a disc-shaped ceramic blank, relates to the technical field of disc-shaped ceramic forming, and aims to solve the problems of non-uniform filling and gaps in the ceramic powder filling process due to the material characteristics of the powder, so that blank finished products are non-uniformly densely distributed, and the production efficiency is improved. And in part of the machining process, a worker continuously and slightly knocks or shakes the mold body, and part of powder is splashed out of the interior of the forming cavity. The powder pressing mold comprises a mold body, a sealing piece and a powder pressing piece, the powder pressing piece comprises a rotating disc arranged in the sealing piece, a threaded notch is formed in the center of the interior of the rotating disc, a one-way threaded rod is connected to the inner side of the threaded notch in a threaded and sleeved mode, and a plurality of sets of fixing plates are arranged on the periphery of the outer side wall of the rotating disc at equal intervals; the powder pressing structure capable of moving up and down is formed in the sealing piece, so that the problems of powder splashing and raw material part waste are reduced.

Description

Technical Field

[0001] This utility model relates to the field of disc-shaped ceramic forming technology, specifically to an isostatic pressing mold for disc-shaped ceramic blanks. Background Technology

[0002] Isostatic pressing (ISP) molds for disc-shaped ceramic blanks refer to specialized mold systems used to prepare disc-shaped ceramic blanks. Their structural design can meet the process requirements of powder filling, ISP molding, and demolding. ISP is a molding technology that uses fluids such as liquids and gases to transmit pressure, so that the material is uniformly pressurized in all directions. Its core principle is to use a fluid medium in a closed environment to uniformly transmit the externally applied high pressure to all surfaces of the material, thereby achieving material densification and shape formation. Due to the uniform pressure distribution, ISP can effectively reduce internal defects in the blank and significantly improve the density and uniformity of the material. Therefore, disc-shaped ceramics produced by ISP generally have advantages such as high purity, high density, excellent mechanical properties, and thermal stability, and are therefore frequently used in the semiconductor manufacturing industry.

[0003] Existing isostatic pressing molds for disc-shaped ceramic blanks mainly consist of a mold body, a forming cavity, and a top mold. During processing, ceramic powder is first placed into the forming cavity, then the top mold is installed on top of the mold body to seal the interior of the mold body. Finally, the mold body is placed into the corresponding pressurizing machine. However, due to the material characteristics of the powder, uneven filling and voids may occur during the filling process, resulting in uneven distribution of the finished blank. Some workers will continuously tap or shake the mold body slightly to improve the uniformity of powder filling. However, during this operation, some powder will splash out of the forming cavity, causing waste of raw materials and respiratory health problems for workers. Utility Model Content

[0004] The purpose of this utility model is to provide a disc-shaped ceramic blank isostatic pressing mold to solve the problem mentioned in the background art where uneven filling and voids occur during the filling process of ceramic powder due to the material characteristics of the powder, resulting in uneven distribution of the finished blank. In some processing, workers will continuously tap or shake the mold body slightly to improve the uniformity of powder filling. However, during this operation, some powder will splash out of the molding cavity, causing waste of raw materials and respiratory health problems for workers.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a disc-shaped ceramic blank isostatic pressing mold, which is used to fill ceramic powder for isostatic pressing, including a mold body, a sealing element, and a powder pressing element. The sealing element is located above the mold body, and part of the powder pressing element is located inside the sealing element, while the other part of the powder pressing element is located outside the sealing element. The powder pressing element includes a turntable located inside the sealing element. A threaded groove is opened at the center of the turntable, and a one-way threaded rod is threaded onto the inner side of the threaded groove. Several sets of fixing plates are equidistantly arranged around the outer wall of the turntable. A lower pressure plate is fixedly connected to the end of each set of fixing plates away from the turntable. A sealing ring is provided on the side of the lower pressure plate away from the fixing plate. A control block is rotatably connected to the center of the outer top surface of the sealing element. Rotating the control block drives the one-way threaded rod to rotate, thereby pushing the sealing ring to move downward or upward.

[0006] By adopting the above technical solution, the lower pressure plate and sealing ring can move downward to compact the powder.

[0007] Preferably, the sealing element includes a top film disposed above the mold body, the top film having an installation cavity inside, the top film having a pressure plate moving cavity inside, the pressure plate moving cavity being disposed outside the installation cavity, and the pressure plate moving cavity communicating with the interior of the installation cavity.

[0008] By adopting the above technical solution, it is convenient to install the various parts of the powder pressing component into the inside or outside of the seal.

[0009] Preferably, both the one-way threaded rod and the turntable are disposed inside the mounting cavity. The bottom end of the one-way threaded rod is rotatably connected to the bottom surface inside the mounting cavity, and the top end of the one-way threaded rod extends to the outside of the top membrane and is fixedly connected to the bottom end of the control block.

[0010] By adopting the above technical solution, the unidirectional threaded rod can push the turntable to move downwards or upwards when it rotates.

[0011] Preferably, a number of connecting plates are fixedly connected at equal intervals around the outer wall of the control block, and the ends of the connecting plates away from the control block extend to the outer side of the mold body. An insert block is fixedly connected to the end of the connecting plate away from the control block.

[0012] By adopting the above technical solution, when the insert block is moved, the connecting plate can be driven to rotate.

[0013] Preferably, the bottom support is located below the mold body, and the bottom support is used to provide support and reinforcement for the bottom of the mold body.

[0014] By adopting the above technical solution, the bottom support components are all made of stainless steel, which plays a certain role in resisting deformation at the bottom of the mold body.

[0015] Preferably, the bottom support includes a bottom mold disposed on the bottom surface of the mold body, a reinforcing insert plate fixedly connected to the top surface of the bottom mold near the mold body, and several sets of insert connecting plates rotatably connected at equal intervals around the outer side wall of the bottom mold.

[0016] By adopting the above technical solutions, the stability and sealing performance of the installation between the mold body and the sealing components can be increased.

[0017] Preferably, the positions and number of the several sets of plug-in connecting plates correspond to the connecting plate, and the end of the plug block away from the connecting plate is inserted into the interior of the plug-in connecting plate and is in close contact with the inner sidewall of the plug-in connecting plate.

[0018] By adopting the above technical solution, the position of the moving connecting plate can be fixed.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] (1) By holding the control block and starting to rotate, the control block drives the one-way threaded rod to rotate. When the one-way threaded rod rotates, it pushes the turntable to move downward. When the turntable moves, it drives the fixed plate to move downward. The fixed plate drives the lower pressure plate to move downward to compact the ceramic powder. The sealing ring compacts the powder at the edge of the molding cavity. Then, the control block is rotated in the opposite direction to slightly adjust the height of the lower pressure plate. The sealing part is moved upward to open the inside of the molding cavity and fill the gaps with ceramic powder. Thus, a powder pressing structure that can move up and down is formed inside the sealing part. The ceramic powder is repeatedly compacted, reducing the gaps between the powders, improving the uniformity of the density distribution when filling the ceramic powder, and reducing the problems of powder splashing and waste of raw materials.

[0021] (2) By setting up a structure with sealing rubber ring, connecting plate, insert block and plug-in connecting plate, when the plug-in connecting plate moves upward and inserts into the insert block, the position of the connecting plate can be fixed, thereby improving the sealing effect between the sealing element and the mold body. The sealing rubber ring can reduce the overflow of powder. At the same time, the connection between the plug-in connecting plate and the insert block increases the stability of the installation between the mold body and the sealing element. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the installation state structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;

[0024] Figure 3This is a schematic cross-sectional view of the top surface of the sealing element of this utility model;

[0025] Figure 4 This is a side cross-sectional view of the sealing element of this utility model;

[0026] Figure 5 This is a schematic diagram of the bottom support structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the lower pressure plate structure of this utility model.

[0028] In the diagram: 1. Mold body; 2. Sealing element; 201. Top mold; 202. Mounting cavity; 203. Pressure plate moving cavity; 3. Powder pressing element; 301. Turntable; 302. Threaded groove; 303. One-way threaded rod; 304. Fixing plate; 305. Lower pressure plate; 306. Sealing ring; 307. Control block; 308. Connecting plate; 309. Insert block; 4. Bottom support element; 401. Bottom mold; 402. Reinforcing insert plate; 403. Insert connecting plate. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] The following is in conjunction with the appendix Figure 1-6 The present invention will be described in further detail below.

[0031] Example 1

[0032] Please see Figure 1-6This embodiment provides a technical solution for an isostatic pressing mold for disc-shaped ceramic blanks: an isostatic pressing mold for disc-shaped ceramic blanks, used for filling ceramic powder for isostatic pressing, including a mold body 1, a sealing element 2, and a powder pressing element 3. The mold body 1 has a forming cavity inside, the forming cavity being disc-shaped with its top end connected to the outside, facilitating the filling of ceramic powder into the cavity. The sealing element 2 includes a top film 201 positioned above the mold body 1; when the top film 201 is installed at the top of the mold body 1, it can seal the forming cavity. As a result, it is convenient to place the mold body 1 inside the pressurizing machine for isostatic pressing. The top mold 201 has an installation cavity 202 inside and a pressure plate moving cavity 203 inside. The pressure plate moving cavity 203 is arranged around the outside of the installation cavity 202 and is connected to the inside of the installation cavity 202. The pressure plate moving cavity 203 is in a ring structure around the installation cavity 202, and a square slot is also provided inside the pressure plate moving cavity 203 to facilitate the adjustment and movement of the fixing plate 304. Therefore, the installation cavity 202, the pressure plate moving cavity 203 and the square slot are connected.

[0033] The bottom support 4 is located below the mold body 1. The bottom support 4 provides support and reinforcement for the bottom of the mold body 1. The entire bottom support 4 is made of stainless steel. The bottom support 4 includes a bottom mold 401 located on the bottom surface of the mold body 1. A reinforcing insert 402 is welded to the top surface of the bottom mold 401 near the mold body 1. A "protrusion" is provided around the outer wall of the reinforcing insert 402. An installation port adapted to the reinforcing insert 402 is opened on the bottom surface of the mold body 1 near the reinforcing insert 402, so that the reinforcing insert 402 can be inserted into the installation port and connected to the mold body 1 to provide support for the bottom of the mold body 1. At the same time, since the mold body 1 is made of rubber, it will deform under pressure. The reinforcing insert 402 and the bottom mold 401 can play a certain role in resisting deformation at the bottom of the mold body 1.

[0034] Example 2

[0035] Please see Figure 1-6The powder pressing component 3 is partially disposed inside the sealing component 2, and another part of the powder pressing component 3 is disposed outside the sealing component 2. The powder pressing component 3 includes a turntable 301 disposed inside the sealing component 2. Both the one-way threaded rod 303 and the turntable 301 are disposed inside the mounting cavity 202. The turntable 301 can move up and down inside the mounting cavity 202. A threaded groove 302 is opened at the center position inside the turntable 301. The bottom end of the one-way threaded rod 303 is rotatably connected to the center position of the bottom surface inside the mounting cavity 202 through a bearing. The top end of the one-way threaded rod 303 extends to the outside of the top film 201 and is connected to the bottom of the control block 307. The end is connected by screws, and a one-way threaded rod 303 is threaded on the inner side of the threaded slot 302. Therefore, when the control block 307 is held and rotated, the one-way threaded rod 303 can be driven to rotate continuously. When the one-way threaded rod 303 rotates, it pushes the turntable 301 to move vertically downward. When the control block 307 is held and rotated in the opposite direction, the one-way threaded rod 303 pushes the turntable 301 to move vertically upward. Several sets of fixing plates 304 are connected at equal intervals around the outer wall of the turntable 301 by screws. The end of each set of fixing plates 304 away from the turntable 301 passes through the interior of the mounting cavity 202 and extends into the interior of the pressure plate moving cavity 203.

[0036] Several sets of fixed plates 304 are connected to a lower pressure plate 305 by screws at the ends away from the turntable 301. The lower pressure plate 305 is made of stainless steel and can provide support for the interior of the molding cavity and reduce deformation. The lower pressure plate 305 is located inside the pressure plate moving cavity 203, and the structure and shape of the lower pressure plate 305 are adapted to the internal structure of the molding cavity to facilitate the compaction of ceramic powder. When the turntable 301 moves, it drives the fixed plate 304 to move downward. The fixed plate 304 drives the lower pressure plate 305 and the sealing ring 306 to move downward to compact the ceramic powder. The lower pressure plate 305 is provided with a sealing ring 306 around the outer side wall away from the fixed plate 304. The sealing ring 306 is bonded to the lower pressure plate 305 with adhesive. The sealing ring 306 can improve the sealing effect of the edge of the molding cavity and reduce the situation of powder splashing. The center of the outer top surface of the sealing element 2 is rotatably connected to the control block 307 through a bearing.

[0037] Example 3

[0038] Please see Figure 1-6A number of sets of plug-in connecting plates 403 are rotatably connected around the outer wall of the bottom mold 401 via bearings. A number of sets of connecting plates 308 are welded at equal intervals around the outer wall of the control block 307. The ends of the connecting plates 308 away from the control block 307 extend to the outside of the mold body 1. The structural shape of the connecting plates 308 is set as "L". An insert block 309 is welded to the end of each connecting plate 308 away from the control block 307. The insert block 309 is set as an arc-shaped square. The plug-in connecting plate 403 has a corresponding square groove inside. When the top of the plug-in connecting plate 403 is held and moved towards the insert block 309, the insert block 309 can be inserted into the square groove to limit and fix the end of the connecting plate 308 away from the control block 307, thereby limiting the connecting plate 308 and preventing the control block 307 from rotating during the movement of the sealing component 2.

[0039] The positions and number of several sets of plug-in connecting plates 403 correspond to the connecting plate 308. The end of the plug block 309 away from the connecting plate 308 is inserted into the interior of the plug-in connecting plate 403 and is in close contact with the inner side wall of the plug-in connecting plate 403. When the plug-in connecting plate 403 is plugged into the connecting plate 308, it is used to lock the mold body 1 and the sealing element 2 together, and complete the fixing work of the sealing element 2. When the plug-in connecting plate 403 is moved outward to release the plugging state with the connecting plate 308, the fixing state between the mold body 1 and the sealing element 2 is released, making it easier to take out the isostatically pressed disc ceramic. At the same time, when the plug-in connecting plate 403 is plugged into the plug block 309, it can also improve the stability and sealing of the installation between the mold body 1 and the sealing element 2.

[0040] Working principle: First, grasp the top of the plug-in connecting plate 403 and move it outward to release the plug-in state between the plug-in connecting plate 403 and the plug block 309, thereby releasing the limiting measures on the connecting plate 308 and the control block 307. Grasp the control block 307 to drive the sealing element 2 to move upward, open the molding cavity inside the mold body 1, and take out the prepared ceramic powder and pour it into the molding cavity.

[0041] Next, place the seal 2 back on the top of the mold body 1, hold the connecting plate 308 and start rotating. When the connecting plate 308 rotates, it drives the one-way threaded rod 303 to rotate. At this time, using the thread structure relationship between the one-way threaded rod 303 and the threaded groove 302, the one-way threaded rod 303 rotates and pushes the turntable 301 to move downward. When the turntable 301 moves, it drives the fixing plate 304 to move downward. The fixing plate 304 drives the lower pressure plate 305 and the sealing ring 306 to move downward to compact the ceramic powder. The sealing ring 306 compacts the powder at the edge of the molding cavity. Then, rotate the control block 307 in the opposite direction to slightly adjust the height of the lower pressure plate 305, move the seal 2 upward to open the inside of the molding cavity, and refill the gaps with ceramic powder.

[0042] Finally, repeat the above operations to fill the ceramic powder evenly, then put the sealing element 2 back on the top of the mold body 1, hold the top of the plug-in connecting plate 403 and move it upward until the plug 309 is inserted into the interior of the plug-in connecting plate 403, thus completing the fixing of the connecting plate 308. This also improves the stability and sealing of the installation between the sealing element 2 and the mold body 1. Then, place the mold body 1 inside the pressurizing machine to perform isostatic pressing on the ceramic powder, thus completing the work.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A disc-shaped ceramic blank isostatic pressing mold, the mold being used for filling ceramic powder for isostatic pressing, characterized in that, The molding die includes: Mold body; A seal is positioned above the mold body; A powder pressing component, wherein a portion of the powder pressing component is disposed inside a sealing component and another portion of the powder pressing component is disposed outside the sealing component, the powder pressing component including a turntable disposed inside the sealing component; A threaded groove is provided at the center of the turntable. A one-way threaded rod is threaded into the inner side of the threaded groove. Several sets of fixing plates are equidistantly arranged around the outer wall of the turntable. A lower pressure plate is fixedly connected to the end of each set of fixing plates away from the turntable. A sealing ring is provided on the side of the lower pressure plate away from the fixing plate. A control block is rotatably connected to the center of the outer top surface of the sealing element. Rotating the control block drives the one-way threaded rod to rotate, thereby pushing the lower pressure plate to move downward or upward.

2. The isostatic pressing mold for disc-shaped ceramic blanks according to claim 1, characterized in that: The sealing element includes a top film positioned above the mold body. The top film has an installation cavity inside and a pressure plate moving cavity inside. The pressure plate moving cavity is located outside the installation cavity and communicates with the interior of the installation cavity.

3. The isostatic pressing mold for disc-shaped ceramic blanks according to claim 2, characterized in that: Both the one-way threaded rod and the turntable are located inside the mounting cavity. The bottom end of the one-way threaded rod is rotatably connected to the bottom surface inside the mounting cavity, and the top end of the one-way threaded rod extends to the outside of the top membrane and is fixedly connected to the bottom end of the control block.

4. The isostatic pressing mold for disc-shaped ceramic blanks according to claim 1, characterized in that: Several sets of connecting plates are fixedly connected at equal intervals around the outer wall of the control block. The ends of the connecting plates away from the control block extend to the outer side of the mold body. Insert blocks are fixedly connected to the ends of the connecting plates away from the control block.

5. The isostatic pressing mold for disc-shaped ceramic blanks according to claim 4, characterized in that, The molding die also includes: A bottom support component is located below the mold body and is used to provide support and reinforcement for the bottom of the mold body.

6. The isostatic pressing mold for disc-shaped ceramic blanks according to claim 5, characterized in that: The bottom support includes a bottom mold set on the bottom surface of the mold body. A reinforcing insert plate is fixedly connected to the top surface of the bottom mold near the mold body. Several sets of insert connecting plates are equidistantly rotatably connected to the outer side wall of the bottom mold.

7. The isostatic pressing mold for disc-shaped ceramic blanks according to claim 6, characterized in that: The positions and number of the several sets of plug-in connecting plates correspond to the connecting plates. The end of the plug block away from the connecting plate is inserted into the interior of the plug-in connecting plate and is in close contact with the inner sidewall of the plug-in connecting plate.

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