A double-sided isostatic pressing tool and forming method

Abstract

This invention discloses a double-sided isostatic pressing fixture and forming method, relating to the field of ceramic tube shell preparation technology. It includes a supporting base plate, a first isostatic pressing steel sheet, multiple adhesive frames, a second isostatic pressing steel sheet, and silicone pads. The first isostatic pressing steel sheet is stacked on the supporting base plate, the multiple adhesive frames are stacked sequentially on the first isostatic pressing steel sheet, and the second isostatic pressing steel sheet is stacked on the topmost adhesive frame. Silicone pads cover both the bottom of the supporting base plate and the top of the second isostatic pressing steel sheet. The supporting base plate has a hollow area, and the adhesive frames have through holes for placing cast sheets. The first isostatic pressing steel sheet has first glue-passing holes corresponding to the inner cavities on the back side of the product after the cast sheets are stacked, and the second isostatic pressing steel sheet has second glue-passing holes corresponding to the inner cavities on the front side of the product after the cast sheets are stacked. This invention solves the problem of manufacturing ceramic tube shells with complex front and back structures, and can be used to isostatically press ceramic green bodies of acceptable quality.

Description

Technical Field

[0001] This invention relates to the field of ceramic tube shell preparation technology, and in particular to a double-sided isostatic pressing tool and forming method. Background Technology

[0002] In the production and processing of ceramic tube shells, there are numerous structural machining processes. The back-side steps require isostatic pressing during processing, a seemingly simple step that plays a crucial role in product quality and assembly. The precision of the machining process and the reliability of the production process significantly impact a company's production costs and time. With advancements in technology, customers are demanding more multi-layered ceramic tube shells with increasingly complex shapes and structures; single-sided hollow tube shells can no longer meet their needs. To address this, a ceramic tube shell was designed with two square cavities on the front and two stepped structures on the back. This structure cannot be fabricated using normal processes. Therefore, we propose a double-sided isostatic pressing technique to solve the problem of manufacturing tube shells with complex front and back structures. Summary of the Invention

[0003] The purpose of this invention is to provide a double-sided isostatic pressing fixture and forming method to solve the problem of manufacturing ceramic tube shells with complex front and back structures, and to produce qualified ceramic green bodies by isostatic pressing.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a double-sided isostatic pressing fixture, including a bearing base plate, a first isostatic pressing steel sheet, multiple adhesive frames, a second isostatic pressing steel sheet, and a silicone pad. The first isostatic pressing steel sheet is stacked on the bearing base plate, the multiple adhesive frames are stacked sequentially on the first isostatic pressing steel sheet, and the second isostatic pressing steel sheet is stacked on the uppermost adhesive frame. The silicone pad covers both the area below the bearing base plate and the area above the second isostatic pressing steel sheet.

[0006] The supporting base plate has a hollow area, and the adhesive frame has a through hole for placing the cast film. The through hole is provided corresponding to the hollow area. The adhesive frame is bonded and fixed to the cast film by adhesive tape.

[0007] The bearing base plate is fixedly provided with positioning pins, and the first isostatic steel sheet, each of the adhesive sheet frames and the second isostatic steel sheet are provided with positioning holes corresponding to the positioning pins.

[0008] The first isostatic pressing steel sheet is provided with a first glue passage hole corresponding to each inner cavity on the back side of the product after the cast film is stacked, and the second isostatic pressing steel sheet is provided with a second glue passage hole corresponding to each inner cavity on the front side of the product after the cast film is stacked. After the first isostatic pressing steel sheet, each of the adhesive frames and the second isostatic pressing steel sheet are positioned and stacked on the bearing base plate through the positioning holes and the positioning pins, each of the first glue passage holes corresponds to each inner cavity on the back side of the product, and each of the second glue passage holes corresponds to each inner cavity on the front side of the product.

[0009] Preferably, the supporting base plate is a square plate, the hollow area is a square hollow area, and the hollow area is located in the middle of the supporting base plate.

[0010] Preferably, four positioning pins are spaced apart on the supporting base plate surrounding the hollow area.

[0011] Preferably, the supporting base plate is an aluminum alloy plate.

[0012] This invention also provides a double-sided isostatic pressing method, which uses the double-sided isostatic pressing tooling described above and includes the following steps:

[0013] Place the prepared casting sheets into the through holes in each of the aforementioned adhesive frames, and fix the casting sheets to the adhesive frames around their perimeter using adhesive tape.

[0014] The first isostatic steel sheet is stacked on the bearing base plate, and each of the adhesive frames is stacked on the first isostatic steel sheet in sequence. The second isostatic steel sheet is stacked on the topmost adhesive frame. When the first isostatic steel sheet, each of the adhesive frames and the second isostatic steel sheet are stacked, they are positioned by the positioning holes and the positioning pins.

[0015] The silicone pad is placed under the bearing base plate and above the second isostatic steel sheet, and then the whole thing is put into a vacuum bag that has been destaticated and vacuum-sealed.

[0016] The sealed vacuum bag is placed into an isostatic press for isostatic pressing. After the process is complete, the vacuum bag is removed and opened to press the ceramic green body.

[0017] Preferably, the vacuum sealing time is 20 seconds.

[0018] Preferably, the isostatic pressure treatment is performed at a pressure of 8-20 MPa for 20-40 min.

[0019] The present invention achieves the following technical effects compared to the prior art:

[0020] This invention provides a double-sided isostatic pressing fixture and forming method. Positioning pins and holes are used to position and stack the first isostatic pressing steel sheet, each adhesive frame, and the second isostatic pressing steel sheet, ensuring accuracy during stacking. First glue-passing holes corresponding to the inner cavities on the back of the product after the casting sheets are stacked are provided on the first isostatic pressing steel sheet, and second glue-passing holes corresponding to the inner cavities on the front of the product after the casting sheets are stacked are provided on the second isostatic pressing steel sheet. Silicone pads are placed under the supporting base plate and above the second isostatic pressing steel sheet. During isostatic pressing, the first and second isostatic pressing steel sheets ensure uniform pressure on the stacked product, and the silicone can fill the inner cavities of the product, preventing the collapse of the inner cavity structure and ensuring product quality. This allows for the isostatic pressing of high-quality ceramic green bodies, solving the problem of manufacturing ceramic tube shells with complex front and back structures. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A side view of the structure of the double-sided isostatic pressing tooling stacked according to the present invention;

[0023] Figure 2 This is a plan view of the supporting base plate in this invention;

[0024] Figure 3 This is a planar schematic diagram of the first isostatically pressed steel sheet in this invention;

[0025] Figure 4 This is a planar schematic diagram of the bonding and fixing of the adhesive frame and the casting sheet in this invention;

[0026] Figure 5 This is a planar schematic diagram of the second isostatically pressed steel sheet in this invention;

[0027] Figure 6 This is a planar schematic diagram of the silicone pad in this invention;

[0028] Figure 7 for Figure 1 A magnified view of part A in the diagram.

[0029] In the figure: 1-Bearing base plate, 2-First isostatic pressure steel sheet, 3-Adhesive frame, 4-Second isostatic pressure steel sheet, 5-Silicone pad, 6-Clearing area, 7-Cast sheet, 8-Through hole, 9-Adhesive tape, 10-Positioning pin, 11-Positioning hole, 12-First glue passage hole, 13-Second glue passage hole. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The purpose of this invention is to provide a double-sided isostatic pressing fixture and forming method to solve the problem of manufacturing ceramic tube shells with complex front and back structures, and to produce qualified ceramic green bodies by isostatic pressing.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-7 As shown, this embodiment provides a double-sided isostatic pressing fixture, including a bearing base plate 1, a first isostatic pressing steel sheet 2, multiple adhesive frames 3, a second isostatic pressing steel sheet 4, and a silicone pad 5. The first isostatic pressing steel sheet 2 is used to be stacked on the bearing base plate 1, the multiple adhesive frames 3 are used to be stacked sequentially on the first isostatic pressing steel sheet 2, and the second isostatic pressing steel sheet 4 is used to be stacked on the topmost adhesive frame 3. The silicone pad 5 covers both the bottom of the bearing base plate 1 and the top of the second isostatic pressing steel sheet 4.

[0034] The base plate 1 has a hollow area 6, and the adhesive frame 3 has a through hole 8 for placing the cast film 7. The through hole 8 is set in a corresponding manner to the hollow area 6. The adhesive frame 3 is bonded and fixed to the cast film 7 by adhesive tape 9.

[0035] A positioning pin 10 is fixedly provided on the bearing base plate 1. The first isostatic steel sheet 2, each adhesive frame 3 and the second isostatic steel sheet 4 are all provided with positioning holes 11 corresponding to the positioning pin 10.

[0036] The first isostatic pressing steel sheet 2 is provided with first glue passage holes 12 corresponding to each inner cavity on the back of the product after the casting sheet 7 is stacked, and the second isostatic pressing steel sheet 4 is provided with second glue passage holes 13 corresponding to each inner cavity on the front of the product after the casting sheet 7 is stacked. After the first isostatic pressing steel sheet 2, each adhesive frame 3 and the second isostatic pressing steel sheet 4 are positioned and stacked on the bearing base plate 1 through positioning holes 11 and positioning pins 10, each first glue passage hole 12 corresponds to each inner cavity on the back of the product, and each second glue passage hole 13 corresponds to each inner cavity on the front of the product.

[0037] In use, the first isostatic pressing steel sheet 2, each adhesive frame 3, and the second isostatic pressing steel sheet 4 are positioned and stacked using positioning pins 10 and positioning holes 11 to ensure the accuracy of stacking. First glue-passing holes 12 are set on the first isostatic pressing steel sheet 2, corresponding to the inner cavities on the back of the product after the casting sheet 7 is stacked. Second glue-passing holes 13 are set on the second isostatic pressing steel sheet 4, corresponding to the inner cavities on the front of the product after the casting sheet 7 is stacked. Silicone pads 5 are placed under the supporting base plate 1 and above the second isostatic pressing steel sheet 4. During isostatic pressing, the first and second isostatic pressing steel sheets 2 and 4 ensure uniform pressure on the stacked product. The silicone on the silicone pads 5 can fill the inner cavities on the front and back of the product through the first and second glue-passing holes 12 and 13 respectively, preventing the collapse of the product's inner cavity structure during isostatic pressing and ensuring product quality. This allows for the isostatic pressing of qualified ceramic green bodies, solving the problem of manufacturing ceramic tube shells with complex front and back structures.

[0038] In this embodiment, the supporting base plate 1 is a square aluminum alloy plate, and the hollow area 6 is a square hollow area located in the center of the supporting base plate 1. Four positioning pins 10 are spaced apart on the supporting base plate 1 around the hollow area 6. The supporting base plate 1 is made of a square aluminum alloy plate, which is lightweight and has high strength. The hollow area 6, the same size as the product area, is cut from the aluminum alloy plate using a slow wire EDM method. The edges of the hollow area 6 are burr-free to prevent interference with the product area.

[0039] A double-sided isostatic pressing method, using the double-sided isostatic pressing fixture described above, includes the following steps:

[0040] Place the prepared casting sheets 7 into the through holes 8 in each of the adhesive frames 3, and fix the casting sheets 7 to the adhesive frames 3 around the perimeter with adhesive tape 9.

[0041] The first isostatic steel sheet 2 is stacked on the bearing base plate 1, and each adhesive frame 3 is stacked on the first isostatic steel sheet 2 in sequence. The second isostatic steel sheet 4 is stacked on the topmost adhesive frame 3. When the first isostatic steel sheet 2, each adhesive frame 3 and the second isostatic steel sheet 4 are stacked, they are positioned by positioning holes 11 and positioning pins 10.

[0042] Cover the bottom plate 1 with a silicone pad 5 and the second isostatic steel sheet 4, then put the whole thing into a vacuum bag that has been destaticated and vacuum-sealed for 20 seconds.

[0043] The sealed vacuum bag is placed into an isostatic press for isostatic pressing. The pressure of the isostatic pressing is 8-20 MPa, and the time is 20-40 minutes. After the process is completed, the vacuum bag is removed and opened, and the ceramic green body is pressed into shape.

[0044] As shown in Table 1, there are multiple sets of experiments using different isostatic pressure parameters. The experimental results in Table 1 show that when the isostatic pressure is 8-20 MPa and the isostatic pressure time is 20-40 min, the result is OK, that is, a qualified product is obtained; when the isostatic pressure is 25 MPa and the isostatic pressure time is 10 min, and when the isostatic pressure is 5 MPa and the isostatic pressure time is 50 min, the result is NG, that is, the process is defective and the product quality is unqualified.

[0045] Table 1 Isostatic Pressure Treatment Tests

[0046]

[0047]

[0048] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A double-sided isostatic pressing fixture, characterized in that: The device includes a bearing base plate, a first isostatic pressing steel sheet, multiple adhesive frames, a second isostatic pressing steel sheet, and a silicone pad. The first isostatic pressing steel sheet is stacked on the bearing base plate, the multiple adhesive frames are stacked sequentially on the first isostatic pressing steel sheet, and the second isostatic pressing steel sheet is stacked on the topmost adhesive frame. The silicone pad covers both the area below the bearing base plate and the area above the second isostatic pressing steel sheet. The supporting base plate has a hollow area, and the adhesive frame has a through hole for placing the cast film. The through hole is provided corresponding to the hollow area. The adhesive frame is bonded and fixed to the cast film by adhesive tape. The bearing base plate is fixedly provided with positioning pins, and the first isostatic steel sheet, each of the adhesive sheet frames and the second isostatic steel sheet are provided with positioning holes corresponding to the positioning pins. The first isostatic pressing steel sheet is provided with a first glue passage hole corresponding to each inner cavity on the back side of the product after the cast film is stacked, and the second isostatic pressing steel sheet is provided with a second glue passage hole corresponding to each inner cavity on the front side of the product after the cast film is stacked. After the first isostatic pressing steel sheet, each of the adhesive frames and the second isostatic pressing steel sheet are positioned and stacked on the bearing base plate through the positioning holes and the positioning pins, each of the first glue passage holes corresponds to each inner cavity on the back side of the product, and each of the second glue passage holes corresponds to each inner cavity on the front side of the product.

2. The double-sided isostatic pressing fixture according to claim 1, characterized in that: The supporting base plate is a square plate, and the hollow area is a square hollow area, which is located in the middle of the supporting base plate.

3. The double-sided isostatic pressing fixture according to claim 2, characterized in that: The supporting base plate surrounding the hollow area is provided with four positioning pins spaced apart.

4. The double-sided isostatic pressing fixture according to claim 1, characterized in that: The supporting base plate is an aluminum alloy plate.

5. A double-sided isostatic pressing method, characterized by, The double-sided isostatic pressing fixture according to any one of claims 1 to 4 includes the following steps: Place the prepared casting sheets into the through holes in each of the aforementioned adhesive frames, and fix the casting sheets to the adhesive frames around their perimeter using adhesive tape. The first isostatic steel sheet is stacked on the bearing base plate, and each of the adhesive frames is stacked on the first isostatic steel sheet in sequence. The second isostatic steel sheet is stacked on the topmost adhesive frame. When the first isostatic steel sheet, each of the adhesive frames and the second isostatic steel sheet are stacked, they are positioned by the positioning holes and the positioning pins. The silicone pad is placed under the bearing base plate and above the second isostatic steel sheet, and then the whole thing is put into a vacuum bag that has been destaticated and vacuum-sealed. The sealed vacuum bag is placed into an isostatic press for isostatic pressing. After the process is complete, the vacuum bag is removed and opened to press the ceramic green body.

6. The double-sided isostatic pressing method according to claim 5, characterized in that: The vacuum sealing time is 20 seconds.

7. The double-sided isostatic pressing method according to claim 5, characterized in that: The isostatic pressure treatment is performed at a pressure of 8-20 MPa for 20-40 minutes.

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