A method for improving the regularity of cold isostatic pressed graphite products using a mold

Abstract

The application relates to a method for improving the regularity of a cold isostatic pressing graphite product mold, two panels, two side plates, a top cover plate and a bottom cover plate are prepared according to the size of the isostatic pressing graphite product to be prepared, transparent adhesive tape is used to paste the connecting positions of the two panels, the two side plates and the bottom cover plate, a square cavity structure with an opening at the top is formed after pasting, then filler for preparing the isostatic pressing graphite product is filled into the square cavity structure, finally, the top cover plate is pasted to the top of the square cavity structure filled with the filler through the transparent adhesive tape, and the inner mold is completed; the outer shell is used in cooperation with the disposable inner mold to replace traditional upper leather sleeve inner molds and lower leather sleeve inner molds, a preset blank shape can be obtained through one-time forming without needing to be cut again, raw materials are saved, the overall finished product has high regularity, and the product appearance is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of isostatic graphite manufacturing, in particular to a method for using a cold isostatic pressing graphite product mold to improve regularity. BACKGROUND

[0002] Graphite is an irreplaceable material for manufacturing single crystal furnace, metal continuous casting graphite crystallizer, graphite electrode for electric spark machining, etc., and is an excellent material for manufacturing rocket nozzle, graphite reactor moderator and reflector material. Isostatic graphite is pressed from high-purity graphite. Isostatic graphite is a new product developed internationally in the past 50 years, closely related to today's high technology. Isostatic graphite is a new type of graphite material, a fine product in graphite materials. With economic development, the domestic and international market capacity of isostatic graphite is increasing day by day, and the development potential is huge. There are many production methods and modes for isostatic pressing, one of which is to use a cold isostatic pressing machine to implement production.

[0003] A cold isostatic pressing machine is a machine that puts the material loaded in a sealed and elastic mold into a container filled with liquid or gas, applies a certain pressure to the material with the liquid or gas, presses the material into a solid, and obtains a raw-shaped blank. After the pressure is released, the mold is taken out of the container, and the blank is further shaped according to needs. Cold isostatic pressing machines can be divided into two types according to the pressing method: wet bag method cold isostatic pressing machine and dry bag method cold isostatic pressing machine. The wet bag method cold isostatic pressing machine is composed of an elastic mold, a high-pressure container, a top cover and a frame, etc. This method suspends the mold in the liquid, also known as the floating mold method. Several molds can be placed in the high-pressure container at the same time. The dry bag method cold isostatic pressing machine is composed of a pressure punch, a high-pressure container, an elastic mold, a position limiter, a top brick device, etc. This method fixes the elastic mold in the high-pressure container and positions it with the position limiter, so it is also called the fixed mold method. When operating, the punch is lifted to load the powder into the mold, and after loading, the pressure punch is used to close the upper opening. When pressurizing, the liquid medium is injected between the cylinder inner wall and the mold outer surface to uniformly press the mold in all directions. The blank is pushed out of the mold by the top brick device.

[0004] In the process of using a cold isostatic pressing machine to implement isostatic graphite products, the traditional production method is to install an upper leather sleeve inner mold and a lower leather sleeve inner mold in an outer mold, then implement external connection sleeve connection and fixing operation at the connection position of the upper leather sleeve inner mold and the lower leather sleeve inner mold, finally fill the filler in the upper leather sleeve inner mold and the lower leather sleeve inner mold, set the lifting lug on the outer side of the outer mold, and open the liquid medium inlet hole on the side of the outer mold. After sealing the top of the upper leather sleeve inner mold, the hoist is used in cooperation with the lifting lug to place the outer mold with the upper leather sleeve inner mold and the lower leather sleeve inner mold in the loading container of the cold isostatic pressing machine and immerse it in the liquid medium, and then implement pressurization production operation.

[0005] Traditional cold isostatic pressing (COP) processes for preparing isostatic graphite products have the following drawbacks: The traditional method of filling material using upper and lower sleeve inner molds, employing a splicing method, is primarily used for preparing larger volumes of graphite batches. This lining method is widely used both domestically and internationally in manufacturing isostatic graphite blanks. The sleeves not only effectively isolate the material from the liquid medium but also create a relatively smooth interface on the graphite blank surface, hence its continued use. Although improvements have been made to the sleeve shape, and some manufacturers have produced larger-volume sleeves with top covers to reduce unevenness at the splicing points on the blank surface during preparation, these methods fail to address a crucial issue: the flatness of the edge angles and corners of the finished graphite blank. Due to limitations in the material of the sleeve, producing right-angled blanks with neat and even corners requires traditional sleeve manufacturing methods that involve shaping the sleeve to fit the blank's shape. However, during use, the corners of the sleeve liner cannot form right angles or acute angles; they are mostly curved transitions. Furthermore, an external shaping and fixing frame is needed for fixation, requiring multiple fixing and shaping operations within the outer mold. Even so, the final finished blank, such as a square block-shaped blank, will still have curved corners. This necessitates cutting these curved corners during later use, a laborious and time-consuming process that results in significant resource waste. Additionally, the overall regularity of the finished blank is poor, affecting the product's appearance. During use, the inner wall of the sleeve and the outer wall of the billet are subjected to the pressure of the liquid medium in the cold isostatic press, which reduces the service life of the inner wall of the sleeve. Under high pressure, the inner wall of the sleeve may stick to the outer wall of the billet. During the removal of the sleeve, part of the inner wall of the sleeve sticks to the outer wall of the billet. In order to ensure the smoothness of the outer surface of the billet in the next use, the sleeve needs to be repaired due to its high cost. Although this repair method can make the sleeve usable again, the surface smoothness of the billet will be affected by the repaired sleeve.

[0006] Therefore, a method for using a cold isostatic pressing graphite product mold that is simple in structure, easy to operate, highly efficient in work and operation, produces high regularity of finished products, accurately controls overall flatness, has distinct corners, saves resources, improves the appearance quality of blanks, reduces repeated repair work, reduces tedious shaping steps, reduces tedious installation of molding liners, and reduces installation difficulty, has broad market prospects. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the application provides a method for using a cold isostatic pressing graphite product mold with simple structure, convenient operation, high work and operation efficiency, high finished product regularity, accurate overall flatness control, clear corner position, saved resources, improved blank appearance quality, reduced repeated repair work, reduced tedious shaping steps, reduced tedious installation of the formed lining, reduced installation difficulty, and improved regularity, which is used to overcome the defects in the prior art.

[0008] The technical scheme of the application is as follows: a method for using a cold isostatic pressing graphite product mold with improved regularity, comprising an external shell of a square cavity structure with an upper cover plate and a lower cover plate movably installed above and below respectively, an upper limiting bolt installed above the upper cover plate, a lower limiting bolt installed below the lower cover plate, a plastic cloth layer provided on the inner wall of the external shell between the upper cover plate and the lower cover plate, the plastic cloth layer wrapping an inner mold of a square cavity structure composed of two panels, two side plates, a top cover plate, and a bottom cover plate, the panels, side plates, top cover plate, and bottom cover plate being square plate structures made of pearl cotton board, KT board, Longka board, or EPS board, an upper fastening nut sleeved on the inner end of the upper limiting bolt, a lower fastening nut sleeved on the inner end of the lower limiting bolt, two hanger connecting blocks symmetrically fixedly installed on the top of the upper cover plate, a lifting eye fixedly installed on the hanger connecting block, and the panels, side plates, top cover plate, and bottom cover plate being connected by transparent adhesive tape, and the method for using the mold being as follows:

[0009] 1) Making the inner mold

[0010] Two panels, two side plates, a top cover plate, and a bottom cover plate are cut and made according to the size of the isostatic pressing graphite product to be made, the connection positions of the two panels, two side plates, and a bottom cover plate are pasted with transparent adhesive tape, an open square cavity structure with an opening at the top is formed after pasting, then a filler for making the isostatic pressing graphite product is filled into the square cavity structure, and finally a top cover plate is pasted to the top of the square cavity structure filled with the filler by transparent adhesive tape, and the inner mold is completed;

[0011] 2) Making the external shell

[0012] According to the size of the inner mold in step 1), the outer shell is welded, which is a square cavity structure made by welding the front side plate, the right side plate, the rear side plate and the left side plate in sequence, and the welding between the front side plate and the right side plate, the right side plate and the rear side plate, and the rear side plate and the left side plate is carried out in a segmented manner during the welding operation. After welding, the level position between the front side plate and the right side plate, the right side plate and the rear side plate, and the rear side plate and the left side plate is provided with a side liquid inlet gap. Then the lower cover plate is installed at the bottom of the outer shell, and the lower limiting bolt is inserted into the bottom of the lower cover plate. The lower fastening nut is installed at the lower limiting bolt end inside the outer shell. The bottom liquid inlet gap is also provided between the lower cover plate and the inner wall of the outer shell. Then the plastic cloth layer is laid in the outer shell above the lower cover plate, and the inner mold made in step 1) is placed in the plastic cloth layer. Finally, the top of the plastic cloth layer is sealed, and the inner mold is completely sealed in the plastic cloth layer. Then the upper cover plate is placed above the plastic cloth layer, and the upper limiting bolt is inserted into the top of the upper cover plate. The upper fastening nut is installed at the upper cover plate end inside the outer shell. The top liquid inlet gap is also provided between the upper cover plate and the inner wall of the outer shell. The outer shell is completed.

[0013] 3) The outer shell made in step 2) is connected to the lifting ring on the lifting lug through the external lifting lug and the lifting lug connection block, and then transferred to the cold isostatic pressure preparation container containing liquid medium. Then the isostatic pressing module is made according to the requirements. During the manufacturing process, the liquid medium enters the inner cavity of the outer shell through the side liquid inlet gap, the bottom liquid inlet gap and the top liquid inlet gap. Under the balanced pressure of the cold isostatic pressing machine, the liquid medium applies balanced pressure to the plastic cloth layer around the outer side of the inner mold. The two panels, two side plates, one top cover plate and one bottom cover plate are shrunk under the balanced pressure, and the filling material inside is compressed and formed at the same time.

[0014] The thickness of the panel, the side plate, the top cover plate and the bottom cover plate is equal, the inner diameter length of the outer shell is not less than the length of the upper cover plate, the inner diameter width of the outer shell is not less than the width of the upper cover plate, the length of the upper cover plate is equal to the length of the lower cover plate, the width of the upper cover plate is equal to the width of the lower cover plate, the upper limiting bolt is at least two, the two upper limiting bolts are symmetrically distributed on the two surfaces of the upper part of the outer shell, the spacing between the two upper limiting bolts is not greater than the length or width of the upper cover plate, the lower limiting bolt is at least two, the two lower limiting bolts are symmetrically distributed on the two surfaces of the lower part of the outer shell, the spacing between the two lower limiting bolts is not greater than the length or width of the lower cover plate, the adjacent two panels and the side plate are at least pasted and connected by two transparent adhesive tapes, the adjacent two panels and the top cover plate are at least pasted and connected by two transparent adhesive tapes, the adjacent two panels and the bottom cover plate are at least pasted and connected by two transparent adhesive tapes, the adjacent two side plates and the top cover plate are at least pasted and connected by one transparent adhesive tape, and the adjacent two side plates and the bottom cover plate are at least pasted and connected by one transparent adhesive tape.

[0015] In the step 1), the internal length of the square cavity structure is equal to the length of the isostatic pressing graphite product to be made, the internal width of the square cavity structure is equal to the width of the isostatic pressing graphite product to be made, and the internal height of the square cavity structure is equal to the height of the isostatic pressing graphite product to be made.

[0016] In the step 2), the length, width and height of the front side plate and the rear side plate are equal, the length, width and height of the right side plate and the left side plate are equal, the length of the front side plate is not less than the length of the panel, the width of the front side plate is not less than the width of the panel, the height of the front side plate is not less than the height of the panel, the length of the left side plate is not less than the length of the side plate, the width of the left side plate is not less than the width of the side plate, and the height of the left side plate is not less than the height of the side plate.

[0017] The present application has the following positive effects:

[0018] Firstly, the present application adopts an external shell matched with a disposable inner mold to replace traditional upper and lower leather sleeve inner molds, under the premise of adopting a plastic cloth layer to ensure that external liquid cannot enter the inner mold, the inner mold with obvious inner corner structure is used to realize the flatness of the edge corner angle and the corner position of the formed blank. The defects of the inner side of the corner position being in an arc structure after the traditional leather sleeve folding and bending are avoided, and the installation operation of a separate external shaping frame is not needed, the steps of mold setting are saved, the shape of the inner mold can be preset according to the shape of the graphite blank to be made, and the inner mold is directly opened and filled in use, sealed by the plastic cloth layer after covering, and directly used, so that the defects of the later-stage blank being irregular and the right-angle position being in an arc structure are avoided, the preset blank shape can be formed at one time without the need of re-cutting, the raw materials are saved, the overall finished product has high regularity, and the product appearance is good.

[0019] Secondly, the inner mold of the present application is a consumable part, which is made of a special material with low price. The material is a raw material in the prior art, which is widely used in the market and has low price. Even if it is used as a disposable consumable, the production cost is not high. The inner mold adopts a plate structure such as pearl cotton board, KT board, dragon card board or EPS board, compared with the traditional leather sleeve which can be used repeatedly, the overall cost is saved. Even if the disposable inner forming assembly needs to be replaced every time it is produced, the cost is still lower than the price of the traditional leather sleeve which is scrapped multiple times. More importantly, the inner mold of the present application can be randomly spliced in real time during use, and is not limited by the toughness of the leather sleeve. After use, it can be directly discarded without the need for repair, drying and leveling before reuse. The flatness of the inner wall of the inner mold can be ensured every time it is used, and the surface finish and flatness of the overall product blank are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a front view structural schematic diagram of the external shell of the present application.

[0021] Figure 2 It is a front view structural schematic diagram of the external shell of the present application. Figure 1

[0022] Figure 3 It is a front view structural schematic diagram of the inner mold of the present application. Figure 1

[0023] Figure 4 It is a front view structural schematic diagram of the inner mold of the present application.

[0024] Figure 5 It is a front view structural schematic diagram of the inner mold of the present application.

[0025] Figure 6 It is a front view structural schematic diagram of the inner mold of the present application.​​

[0026] Figure 7 This is a schematic diagram of the inner mold filling structure of the present invention. Detailed Implementation

[0027] like Figure 1 , 2 As shown in Figures 3, 4, 5, 6, and 7, a method for using a cold isostatic pressing graphite product mold to improve regularity includes an outer shell 7 with a square cavity structure on which an upper cover plate 12 and a lower cover plate 13 are respectively movably installed. An upper limiting bolt 8 is installed above the upper cover plate 12, and a lower limiting bolt 14 is installed below the lower cover plate 13. A plastic cloth layer is provided on the inner wall of the outer shell 7 between the upper cover plate 12 and the lower cover plate 13. The square cavity structure composed of two front panels 17, two side panels 19, a top cover plate 16, and a bottom cover plate 18 is wrapped inside the plastic cloth layer. The inner mold, panel 17, side panel 19, top cover 16, and bottom cover 18 are all square plate structures made of pearl cotton board, KT board, duct board, or EPS board. The upper limiting bolt 8 has an upper fastening nut 9 fitted inside, and the lower limiting bolt 14 has a lower fastening nut 15 fitted inside. Two lifting connection blocks 10 are symmetrically fixedly installed on the top of the upper cover 12, and lifting rings 11 are fixedly installed on the lifting connection blocks 10. Panel 17, side panel 19, top cover 16, and bottom cover 18 are all connected by transparent tape. Its characteristic is that its usage method is as follows:

[0028] 1) Making the inner mold

[0029] According to the required size of the isostatic graphite product, cut and make two panels 17, two side panels 19, one top cover 16 and one bottom cover 18. Use transparent tape to stick the connection positions of the two panels 17, two side panels 19 and one bottom cover 18 to form a square cavity structure with an opening at the top. Then fill the square cavity structure with the filler material for making the isostatic graphite product. Finally, stick the top cover 16 to the top of the square cavity structure filled with filler material with transparent tape. The inner mold is now complete.

[0030] 2) Fabrication of the outer casing

[0031] According to the size of the inner mold in step 1), the outer shell 7 is welded, which is a square cavity structure made by welding the front side plate, the right side plate, the rear side plate and the left side plate in sequence. During the welding operation, the welding between the front side plate and the right side plate, the right side plate and the rear side plate, and the rear side plate and the left side plate adopts a segmented welding structure. After welding, the level position between the front side plate and the right side plate, the right side plate and the rear side plate, and the rear side plate and the left side plate is provided with a side liquid inlet gap. Then the lower cover plate 13 is installed at the bottom of the outer shell 7, and the lower limiting bolt 14 is inserted into the bottom of the lower cover plate 13. The lower end of the limiting bolt 14 inside the outer shell 7 is provided with a lower fastening nut 15. The lower cover plate 13 and the inner wall of the outer shell 7 are also provided with a bottom liquid inlet gap. Then the plastic cloth layer is laid in the outer shell 7 above the lower cover plate 13, and the inner mold made in step 1) is placed in the plastic cloth layer. Finally, the top of the plastic cloth layer is sealed, and the inner mold is completely sealed in the plastic cloth layer. Then the upper cover plate 12 is placed above the plastic cloth layer, and the upper limiting bolt 8 is inserted into the top of the upper cover plate 12. The upper end of the upper cover plate 12 inside the outer shell 7 is provided with an upper fastening nut 9. The upper cover plate 12 and the inner wall of the outer shell 7 are also provided with a top liquid inlet gap. The outer shell is completed.

[0032] 3) The outer shell made in step 2) is connected to the lifting ring 11 on the lifting lug connection block 10 by the external lifting lug, and then transferred to the cold isostatic pressure preparation container containing liquid medium. Then the isostatic pressure module is made according to the requirements. During the manufacturing process, the liquid medium enters the inner cavity of the outer shell 7 through the side liquid inlet gap, the bottom liquid inlet gap and the top liquid inlet gap. Under the balanced pressure of the cold isostatic pressing machine, the liquid medium applies balanced pressure to the plastic cloth layer around the outer side of the inner mold. The two panels 17, the two side plates 19, the top cover plate 16 and the bottom cover plate 18 are shrunk under the balanced pressure, and the filling material inside is compressed and formed at the same time.

[0033] The thickness of the panel 17, the side plate 19, the top cover plate 16 and the bottom cover plate 18 is equal, the inner diameter length of the outer shell 7 is not less than the length of the upper cover plate 12, the inner diameter width of the outer shell 7 is not less than the width of the upper cover plate 12, the length of the upper cover plate 12 is equal to the length of the lower cover plate 13, the width of the upper cover plate 12 is equal to the width of the lower cover plate 13, the upper limiting bolt 8 is at least two, the two upper limiting bolts 8 are symmetrically distributed on the two surfaces of the upper part of the outer shell 7, the spacing between the two upper limiting bolts 8 is not greater than the length or width of the upper cover plate 12, the lower limiting bolt 14 is at least two, the two lower limiting bolts 14 are symmetrically distributed on the two surfaces of the lower part of the outer shell 7, the spacing between the two lower limiting bolts 14 is not greater than the length or width of the lower cover plate 13, the adjacent two panels 17 and the side plate 19 are at least connected by two transparent adhesive tapes 20, the adjacent two panels 17 and the top cover plate 16 are at least connected by two transparent adhesive tapes 20, the adjacent two panels 17 and the bottom cover plate 18 are at least connected by two transparent adhesive tapes 20, the adjacent two side plates 19 and the top cover plate 16 are at least connected by one transparent adhesive tape 20, and the adjacent two side plates 19 and the bottom cover plate 18 are at least connected by one transparent adhesive tape 20.

[0034] In step 1, the internal length of the square cavity structure is equal to the length of the isostatic pressing graphite product to be made, the internal width of the square cavity structure is equal to the width of the isostatic pressing graphite product to be made, and the internal height of the square cavity structure is equal to the height of the isostatic pressing graphite product to be made.

[0035] In step 2, the length, width and height of the front side plate and the rear side plate are equal, the length, width and height of the right side plate and the left side plate are equal, the length of the front side plate is not less than the length of the panel 17, the width of the front side plate is not less than the width of the panel 17, the height of the front side plate is not less than the height of the panel 17, the length of the left side plate is not less than the length of the side plate 19, the width of the left side plate is not less than the width of the side plate 19, and the height of the left side plate is not less than the height of the side plate 19.

[0036] The material of the inner mold in the application is determined through tests and practices. First, the pearl cotton board, also known as polyethylene foam, is a non-crosslinked closed-cell structure, which has unique characteristics. Under the pressure of external liquid medium in a cold isostatic pressing machine, it can uniformly shrink and implement isostatic pressing and densification on the powdery additive inside. The pearl cotton is a new type of environmentally friendly packaging material. In the patent, the material plate for the inner mold has a relatively low overall density, is convenient to cut when used, and is composed of a large number of independent bubbles generated by physical foaming of low-density polyethylene. As can be seen, it has bubbles inside, which is an important factor for the application to adopt this material structure to implement isostatic pressing of graphite blanks. It overcomes the shortcomings of ordinary foaming glue, such as fragility, deformation, and poor recovery. It has many advantages, such as water and moisture resistance, shock resistance, sound insulation, heat preservation, good plasticity, high toughness, recycling, environmental protection, and strong impact resistance. It also has good chemical resistance. The KT board is a new type of material composed of polystyrene particles foamed into a board core and then coated with a film and pressed together. The board is straight, light, not easy to deteriorate, and easy to process. As can be seen, the KT board has the advantages of strong foaming and plasticity of the pearl cotton board, and can also meet the application requirements in the cold isostatic pressing machine. The Longka board is an improved KT board composed of two KT boards. The board surface has good adhesion, high hardness, and good tension, and can meet the application requirements in the cold isostatic pressing machine. The foam board is an EPS board, which has the advantages of light weight, low cost, low thermal conductivity, low water absorption, good electrical insulation performance, sound insulation, shock resistance, moisture resistance, and simple forming process. It is a polystyrene foam plastic board material with a closed-cell structure made by heating and forming the pre-foamed polystyrene beads in a mold. Thus, it can meet the application requirements in the cold isostatic pressing machine.

[0037] The application uses the plastic cloth layer to implement liquid isolation of the disposable inner mold, which is convenient to implement in the cold isostatic pressing machine. The plastic cloth layer combined with the inner mold replaces the traditional leather cover, which is difficult to shape and set, and the overall operation difficulty is greatly reduced. More importantly, while the operation difficulty is reduced, the regularity of the isostatic pressing graphite blank product is greatly improved. The traditional method solves the defect of the arc structure of the blank, and instead produces a blank product with a clear corner structure with a right angle or an acute angle or an obtuse angle. Only the outer shell and the inner mold need to be designed to implement the forming of the isostatic pressing graphite blank product with different angles. The corner position will no longer have an arc defect, and the regularity is very high. The surface of the blank is flat, and the face plate 17, the side plate 19, the top cover plate 16, and the bottom cover plate 18 can uniformly shrink in the pressure cavity of the cold isostatic pressing machine, ensuring the flatness of the blank surface.

[0038] During the entering process of the liquid medium, gaps are arranged between the outer side of the upper cover plate 12 and the lower cover plate 13 arranged at the top and bottom of the outer shell and the inner wall of the outer shell 7, and gaps are also arranged between the corner welding point positions of the outer shell 7, so that no defect of liquid medium unable to enter occurs during use, and the liquid medium is isolated outside the plastic cloth layer after entering and cannot enter the inner cavity of the inner mold inside the plastic cloth layer.

[0039] The present application overcomes the defects in the production of traditional isostatic pressing graphite blanks, has good social value and economic value in improving the angle structure of the blank, the overall regularity of the blank and the surface flatness of the blank, and most of the production of isostatic pressing graphite blanks using cold isostatic pressing machines in the world currently uses leather as the lining. The present application can change the many defects of the leather lining, and through repeated tests and verification, technical innovation is realized, and the present application has strong popularization value.

Claims

1. A method for improving the regularity of a cold isostatic pressing graphite product mold, comprising an external shell (7) of square cavity structure with an upper cover plate (12) and a lower cover plate (13) movably installed above and below respectively, an upper limiting bolt (8) installed above the upper cover plate (12), a lower limiting bolt (14) installed below the lower cover plate (13), a plastic cloth layer provided on the inner wall of the external shell (7) between the upper cover plate (12) and the lower cover plate (13), the plastic cloth layer wrapping an inner mold of square cavity structure composed of two panels (17), two side plates (19), a top cover plate (16) and a bottom cover plate (18), the panels (17), the side plates (19), the top cover plate (16) and the bottom cover plate (18) are all square plate structures made of pearl cotton board, KT board, dragon card board or EPS board, an upper fastening nut (9) is sleeved on the inner end of the upper limiting bolt (8), a lower fastening nut (15) is sleeved on the inner end of the lower limiting bolt (14), two lifting lug connecting blocks (10) are symmetrically fixedly installed on the top of the upper cover plate (12), a lifting eye (11) is fixedly installed on the lifting lug connecting block (10), the panels (17), the side plates (19), the top cover plate (16) and the bottom cover plate (18) are all connected by transparent adhesive tape, characterized in that, The method of use is: Make the inner mold According to the size of the isostatic graphite product to be made, two panels (17), two side plates (19), a top cover plate (16) and a bottom cover plate (18) are cut and made, the connecting positions of the two panels (17), the two side plates (19) and the bottom cover plate (18) are pasted with transparent tape, and after pasting, a square cavity structure with an opening at the top is formed, then the filler for making the isostatic graphite product is filled into the square cavity structure, and finally the top cover plate (16) is pasted to the top of the square cavity structure filled with the filler by transparent tape, and the inner mold is completed; Make the outer shell According to the size of the inner mold in step 1), the outer shell (7) is welded, which is a square cavity structure made by welding the front side plate, the right side plate, the rear side plate and the left side plate in order. During the welding operation, the welding between the front side plate and the right side plate, the right side plate and the rear side plate, and the rear side plate and the left side plate adopts a segmented welding structure. After welding, the connecting positions between the front side plate and the right side plate, the right side plate and the rear side plate, and the rear side plate and the left side plate are provided with side liquid inlet gaps. Then the lower cover plate (13) is installed at the bottom of the outer shell (7), and the lower limiting bolt (14) is inserted into the bottom of the lower cover plate (13). The lower fastening nut (15) is installed at the end of the lower limiting bolt (14) inside the outer shell (7). The bottom liquid inlet gap is also provided between the lower cover plate (13) and the inner wall of the outer shell (7). Then a plastic cloth layer is laid on the outer shell (7) above the lower cover plate (13), and the inner mold made in step 1) is placed in the plastic cloth layer. Finally, the top of the plastic cloth layer is sealed, and the inner mold is completely isolated and sealed in the plastic cloth layer. Then the upper cover plate (12) is placed above the plastic cloth layer, and the upper limiting bolt (8) is inserted into the top of the upper cover plate (12). The upper fastening nut (9) is installed at the end of the upper cover plate (12) inside the outer shell (7). The top liquid inlet gap is also provided between the upper cover plate (12) and the inner wall of the outer shell (7). The outer shell is completed; 3) Connect the lifting lugs (11) on the lifting lug connecting block (10) through the external lifting lugs, and transfer the outer shell made in step 2) to the cold isostatic pressure preparation container containing the liquid medium, then perform the isostatic pressing operation as required. During the manufacturing process, the liquid medium enters the inner cavity of the outer shell (7) through the side liquid inlet gap, the bottom liquid inlet gap and the top liquid inlet gap, and under the balanced pressure of the cold isostatic pressing machine, the liquid medium performs balanced pressure operation on the plastic cloth layer around the outside of the inner mold. The two panels (17), the two side plates (19), the top cover plate (16) and the bottom cover plate (18) realize shrinkage under the balanced pressure, and at the same time, the filler inside is compressed and formed.

2. The method of using a cold isostatic pressing graphite article mold of increased rigidity of claim 1, wherein: The thickness of the panel (17), the side plate (19), the top cover plate (16) and the bottom cover plate (18) is equal, the inner diameter length of the outer shell (7) is not less than the length of the upper cover plate (12), the inner diameter width of the outer shell (7) is not less than the width of the upper cover plate (12), the length of the upper cover plate (12) is equal to the length of the lower cover plate (13), the width of the upper cover plate (12) is equal to the width of the lower cover plate (13), the upper limiting bolt (8) is at least two, two upper limiting bolts (8) are symmetrically distributed on the two surfaces of the upper part of the outer shell (7), the spacing between the two upper limiting bolts (8) is not greater than the length or width of the upper cover plate (12), the lower limiting bolt (14) is at least two, two lower limiting bolts (14) are symmetrically distributed on the two surfaces of the lower part of the outer shell (7), the spacing between the two lower limiting bolts (14) is not greater than the length or width of the lower cover plate (13), the adjacent two panels (17) and the side plate (19) are connected by at least two transparent adhesive tapes (20), the adjacent two panels (17) and the top cover plate (16) are connected by at least two transparent adhesive tapes (20), the adjacent two panels (17) and the bottom cover plate (18) are connected by at least two transparent adhesive tapes (20), the adjacent two side plates (19) and the top cover plate (16) are connected by at least one transparent adhesive tape (20), and the adjacent two side plates (19) and the bottom cover plate (18) are connected by at least one transparent adhesive tape (20).

3. The method of using a cold isostatic pressing graphite product mold of increased rigidity of claim 1, wherein: In the step 1), the internal length of the square cavity structure is equal to the length of the isostatic pressing graphite product to be made, the internal width of the square cavity structure is equal to the width of the isostatic pressing graphite product to be made, and the internal height of the square cavity structure is equal to the height of the isostatic pressing graphite product to be made.

4. The method of using a cold isostatic pressing graphite product mold of increased rigidity of claim 1, wherein: In the step 2), the length, width and height of the front side plate and the rear side plate are equal, the length, width and height of the right side plate and the left side plate are equal, the length of the front side plate is not less than the length of the panel (17), the width of the front side plate is not less than the width of the panel (17), the height of the front side plate is not less than the height of the panel (17), the length of the left side plate is not less than the length of the side plate (19), the width of the left side plate is not less than the width of the side plate (19), and the height of the left side plate is not less than the height of the side plate (19).

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