Carbon fiber paper hot-pressing die

Abstract

The utility model relates to a carbon fiber paper hot-pressing mold, and relates to the field of carbon paper processing technology, the carbon fiber paper hot-pressing mold comprises a forming mold, the forming mold is integrally provided with a mold cavity, the mold cavity is used for placing a carbon paper sample, the shape of the mold cavity is matched with that of the carbon paper sample, and the carbon fiber paper hot-pressing mold has the effect of better fixing the sample.

Description

Technical Field

[0001] The present application relates to the field of carbon paper processing technology, and in particular to a carbon fiber paper hot pressing mold. Background Art

[0002] At present, the industrialization of hydrogen fuel cells is a key task in China. Carbon paper is the most widely used material for the gas diffusion layer of hydrogen fuel cells. The preparation process of carbon paper mainly involves mixing short-cut carbon fibers of the same or different lengths, dispersants, and binders to make paper, impregnating the liquid phase with resin and hot pressing and curing, and finally carbonizing and graphitizing at high temperatures. In the preparation process of carbon paper, hot pressing and curing is the key step for uniform distribution of resin and uniform thickness of carbon paper.

[0003] In the related art, the application document with publication number CN101277912A discloses a porous carbon sheet and a method for manufacturing the same, providing a separator for controlling the thickness of carbon paper, placing carbon paper thickness control separators on both sides of the hot press during the hot pressing process, the separator thickness is the thickness of the carbon paper pressed, the porous carbon sheet is formed by bonding dispersed carbon short fibers with resin carbide, the micropores of the sheet have a micropore diameter of 45 to 90 μm, and the average fiber diameter of the carbon short fibers is 5 to 20 μm. The porous carbon sheet is manufactured by heat-forming a precursor fiber sheet containing carbon short fibers with a unit area weight of 15 to 30 g / m2 and a thermosetting resin with a unit area weight of 30 to 80 g / m2 using a hot plate set at a certain interval, and carbonizing the thermosetting resin contained in the precursor fiber sheet that has been heat-formed.

[0004] With regard to the above-mentioned related technologies, the precursor fiber sheet is placed between partitions, and the thermosetting resin contained in the precursor fiber sheet is carbonized by a hot press. However, the thickness of the partition used is 100~250μm. The plate is too thin and easily deformed under pressure. The partition is only placed at both ends of the hot press, which places high requirements on the parallelism of the hot press itself. In the part of the hot press where there is no and far away from the spacer, the parallelism is difficult to guarantee. The parallelism of the large-area hot presses currently on the market will have a greater impact on the final carbon paper, resulting in an inability to better fix the sample. Utility Model Content

[0005] In order to improve the problem of being unable to better fix the sample, the present application provides a carbon fiber paper hot pressing mold.

[0006] The carbon fiber paper hot pressing mold provided in this application adopts the following technical solution:

[0007] A carbon fiber paper hot pressing mold comprises a forming mold, wherein the forming mold is integrally provided with a mold cavity, the mold cavity is used to place a carbon paper sample, and the shape of the mold cavity is adapted to the carbon paper sample.

[0008] By adopting the above technical scheme, when it is necessary to hot press the carbon fiber paper, the molding mold is prefabricated in the factory in advance according to the design requirements. Subsequently, the molding mold is moved to a suitable position, the carbon paper sample is taken out, the molding mold is opened, the carbon paper sample is placed in the mold cavity, the carbon paper sample is adjusted to a suitable position, and then the molding mold is closed. Thereafter, the molding mold with the carbon paper sample is moved to the hot press, the molding mold is placed on the hot press as required, the mold is hot pressed by the hot press to form carbon paper, and after the hot pressing is completed, the molding mold is removed and the carbon paper is taken out. Compared with the related art, the present application places the carbon paper sample in the mold cavity and hot presses the molding mold by the hot press. The molding mold will not be offset, which is convenient for fixing the carbon paper sample. The integrated mold cavity has better pressure-bearing capacity and will not deform under high pressure to affect the size and uniformity of the sample, which is conducive to improving the problem of not being able to better fix the sample.

[0009] Optionally, the molding mold includes an upper mold and a lower mold, the upper mold and the lower mold have the same length and thickness, the lower mold is provided with a placement groove at the center thereof for forming a cavity, the shape of the cavity is adapted to the shape of the carbon paper sample, and the placement groove is used to prevent the carbon paper sample, the upper mold and the lower mold from fitting together.

[0010] By adopting the above technical solution, when it is necessary to place a carbon paper sample, first, place the lower mold in a suitable position, take out the carbon paper sample, place the carbon paper sample in the placement slot, and adjust the carbon paper sample to a suitable position. Then, take out the upper mold, fit the upper mold and the lower mold together, and the carbon paper is placed. Then, place the installed upper mold and lower mold on a hot press for hot pressing. By setting the upper mold, the lower mold and the placement slot, it is convenient to place the carbon paper sample. The shape of the cavity is adapted to the shape of the carbon paper sample, which is convenient for fixing the carbon paper sample and helps to improve the problem of not being able to better fix the sample.

[0011] Optionally, at least one upper air guide groove is opened on the side of the upper mold close to the lower mold, and at least one lower air guide groove is opened on the side of the lower mold close to the upper mold. The upper air guide groove and the lower air guide groove are arranged in a mirror image, and the upper air guide groove and the lower air guide groove form an air guide groove.

[0012] By adopting the above technical solution and setting up air guide grooves, when the hot press is hot pressing the carbonized sample, the gas generated during the hot pressing and curing process of the resin can be quickly discharged, thereby improving the fluidity of the resin and further improving the uniformity of the pressed carbon paper, so that the carbon paper has better conductivity, porosity and mechanical properties.

[0013] Optionally, the length and depth of the upper air guiding groove and the lower air guiding groove should not be too large, and the depth of the lower air guiding groove is greater than the depth of the placement groove.

[0014] By adopting the above technical solution, on the one hand, the length and depth of the upper and lower air guide grooves should not be too large, otherwise it will affect the pressure bearing of the mold; on the other hand, the depth of the lower air guide groove is greater than the depth of the placement groove, which facilitates better gas discharge.

[0015] Optionally, the molding mold also includes a receiving plate and a cover plate, the receiving plate is located below the cover plate, the receiving plate includes a base plate and an enclosure frame, the enclosure frame is connected to the base plate close to the cover plate, the base plate and the enclosure frame form a receiving cavity for placing the carbon paper sample, the hollow portion of the enclosure frame has a shape adapted to the carbon paper sample, and the cover plate is fitted with the enclosure frame.

[0016] By adopting the above technical solution, when it is necessary to place a carbon paper sample, first, place the substrate in a suitable position, place the enclosing frame on the substrate, take out the carbon paper sample so that the carbon paper sample is located in the receiving cavity, and adjust the carbon paper sample to a suitable position. Subsequently, take out the cover plate, cover the cover plate to the side of the enclosing frame away from the substrate, so that the cover plate and the enclosing frame fit together. After the carbon paper is placed, the installed cover plate and substrate are placed on a hot press for hot pressing. By setting the receiving plate and the cover plate, it is convenient to place the carbon paper sample. The shape of the receiving cavity is adapted to the shape of the carbon paper sample, which is convenient for fixing the carbon paper sample, and is conducive to improving the problem of not being able to better fix the sample.

[0017] Optionally, the side wall of the enclosure frame is evenly provided with a plurality of air holes along the circumferential direction.

[0018] By adopting the above technical solution and providing air holes, when the hot press is hot pressing the carbonized sample, the gas generated during the hot pressing and curing process of the resin can be quickly discharged from the air holes, thereby improving the fluidity of the resin and further improving the uniformity of the pressed carbon paper.

[0019] Optionally, two fixing components are further included, one of which is connected to the upper mold, and the other of which is connected to the lower mold;

[0020] Or one of the fixing components is connected to the cover plate, and the other fixing component is connected to the base plate.

[0021] By adopting the above technical solution, when the upper mold needs to be moved, the personnel only need to move the fixed component, and the fixed component drives the upper mold to move. Similarly, the fixed component can drive the lower mold, the cover plate and the substrate to move. By setting the fixed component, it is easy to move the molding mold and prevent burns from high-temperature molds.

[0022] Optionally, the fixing assembly includes two handles, wherein the two handles in one of the fixing assemblies are respectively located on two sides directly facing the upper mold, and the handles are connected to the upper mold, and the two handles in the other fixing assembly are respectively located on two sides directly facing the lower mold, and the handles are connected to the lower mold;

[0023] Or the two handles in one of the fixing components are respectively connected to two opposite sides of the cover plate, and the two handles in the other fixing component are respectively connected to two opposite sides of the base plate.

[0024] By adopting the above technical solution and providing a handle, a person only needs to hold the handle and pull the handle to drive the mold to move, which is convenient for operation.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. Compared with the related art, the present application places the carbon paper sample in the mold cavity and heat-presses the molding mold by a hot press. The molding mold will not be offset, which is convenient for fixing the carbon paper sample. The integrated mold cavity has better pressure bearing capacity and will not deform under high pressure to affect the size and uniformity of the sample, which is conducive to improving the problem of not being able to better fix the sample;

[0027] 2. By setting the upper mold, the lower mold and the placement groove, it is convenient to place the carbon paper sample. The shape of the cavity is adapted to the shape of the carbon paper sample, which is convenient for fixing the carbon paper sample and helps to improve the problem of not being able to better fix the sample;

[0028] 3. By providing a receiving plate and a cover plate, it is convenient to place the carbon paper sample. The shape of the receiving cavity is adapted to the shape of the carbon paper sample, which is convenient for fixing the carbon paper sample and helps to improve the problem of not being able to better fix the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of Example 1;

[0030] Figure 2 is an exploded view in Example 1;

[0031] Figure 3 It is an exploded view in Example 2.

[0032] Explanation of the reference numerals: 1. Molding mold; 11. Upper mold; 111. Upper air guide groove; 12. Lower mold; 121. Lower air guide groove; 122. Placement groove; 13. Receiving plate; 131. Base plate; 132. Enclosing frame; 1321. Air vent; 14. Cover plate; 2. Fixing assembly; 21. Handle. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-3 This application is described in further detail.

[0034] The embodiment of the present application discloses a carbon fiber paper hot pressing mold.

[0035] Example 1

[0036] Reference Figure 1 A carbon fiber paper hot pressing mold comprises a forming mold 1 and two fixing components 2, wherein the fixing components 2 are arranged on the forming mold 1.

[0037] Reference Figure 1 The molding mold 1 includes an upper mold 11 and a lower mold 12. In this embodiment, the upper mold 11 and the lower mold 12 are both rectangular plates, and the length and thickness of the upper mold 11 and the lower mold 12 are the same. The size of the upper mold 11 and the lower mold 12 can be adjusted according to the size of the sample and the pressure. In this embodiment, the length of the upper mold 11 and the lower mold 12 is selected from 300mm-400mm, the width is selected from 300mm-400mm, and the thickness is selected from 15mm-25mm. The surface of the upper mold 11 close to the lower mold 12 and the surface of the upper mold 11 away from the lower mold 12 are both smoothed, and the upper mold 11 and the lower mold 12 fit each other.

[0038] Reference Figure 1 and Figure 2At least one upper air guide groove 111 is provided on one side of the upper mold 11 close to the lower mold 12. In the present embodiment, the number of the upper air guide grooves 111 is four, and the four upper air guide grooves 111 are evenly distributed along the circumference of the upper mold 11, and one upper air guide groove 111 corresponds to one side of the upper mold 11. In the present embodiment, the longitudinal section of the upper air guide groove 111 is inverted L-shaped, and the opening of the upper air guide groove 111 faces one side of the upper mold 11. The length and depth of the upper air guide groove 111 should not be too large, otherwise It will affect the pressure of the mold. In this embodiment, the depth of the upper air guide groove 111 is 0.3mm-0.7mm and the length is 50mm-80mm. The lower mold 12 is provided with at least one lower air guide groove 121 on the side close to the upper mold 11. In this embodiment, the number of the lower air guide grooves 121 is four, one upper air guide groove 111 corresponds to one lower air guide groove 121, and the width of the lower air guide groove 121 is the length of the placement groove 122 from the side of the lower mold 12. The upper mold 11 and the lower mold 12 are arranged in a mirror image, with the same size and position. When the upper mold 11 and the lower mold 12 are fitted, the upper air guide groove 111 and the lower air guide groove 121 form an air guide groove, so that the gas generated during the hot pressing and curing process of the resin can be quickly discharged, thereby improving the fluidity of the resin; the lower mold 12 is provided with a placement groove 122 at its center to form a cavity, the shape of the cavity is adapted to the shape of the carbon paper sample, the placement groove 122 can be used to place the carbon paper sample to form an integrated mold, and will not deform under the high pressure of the hot press; the depth of the placement groove 122 is 0.1mm-0.3mm, and the depth of the placement groove 122 is processed according to the thickness of the carbon paper sample. The depth of the lower air guide groove 121 is greater than the depth of the placement groove 122, so as to better discharge the gas on the surface of the carbon paper sample, the cavity surface of the lower mold 12 and the mirror position of the upper mold 11 are polished, and other areas are finely processed, so as to facilitate the processing of the carbon paper sample; the material of the molding mold 1 is SKD61, quenched, and the hardness is 48-52HRC.

[0039] Reference Figure 1 and Figure 2 , one fixed component 2 corresponds to the upper mold 11, and the other fixed component 2 corresponds to the lower mold 12. The fixed component 2 can be a connecting rod, a connecting plate, or a handle. For the convenience of description, in this embodiment, the upper mold 11 is selected for description. In this embodiment, the fixed component 2 includes two handles 21, and the two handles 21 are respectively located on the two sides opposite to the upper mold 11. The handles 21 can be fixedly connected to the upper mold 11 by welding, or fixedly connected to the upper mold 11 by screws. Specifically, the handles 21 are fixedly connected to the upper mold 11 by screws. People hold the handles 21 to facilitate moving the mold and prevent burns from high-temperature molds. The connection method of the other fixed component 2 and the lower mold 12 is consistent with the connection method of the above-mentioned fixed component 2 and the upper mold 11.

[0040] The implementation principle of Example 1 is as follows: when hot pressing of carbon fiber paper is required, the upper mold 11 and the lower mold 12 are prefabricated in the factory in advance according to the design requirements. The upper mold 11 and the lower mold 12 can be prefabricated according to the thickness of the carbon paper sample. Subsequently, the carbon paper sample is placed in the cavity on the lower mold 12, and then the upper mold 11 and the lower mold 12 are installed. The mold with the carbon paper sample is moved to the hot press, and the mold is placed on the hot press as required. The mold is hot pressed by the hot press to form carbon paper. After the hot pressing is completed, the personnel hold the handle 21 and move the upper mold 11 to the side away from the lower mold 12 to take out the carbon paper.

[0041] When the carbon paper sample needs to be placed, first, place the lower mold 12 in a suitable position, take out the carbon paper sample, place the carbon paper sample in the placement groove 122, and adjust the carbon paper sample to a suitable position. Then, take out the upper mold 11, and the person holds the handle 21 to fit the upper mold 11 and the lower mold 12. At this time, the upper air guide groove 111 and the lower air guide groove 121 correspond to each other, and the carbon paper sample is placed.

[0042] Example 2

[0043] Reference Figure 3 The present embodiment is different from the embodiment 1 in that the molding mold 1 further comprises a containing plate 13 and a cover plate 14, the containing plate 13 comprises a substrate 131 and an enclosure frame 132, in the present embodiment, the substrate 131 is a rectangular plate, the enclosure frame 132 is located above the substrate 131, when the enclosure frame 132 is placed on the substrate 131, the side wall of the enclosure frame 132 is aligned with the side wall of the substrate 131, the enclosure frame 132 is in contact with the substrate 131, the surface of the substrate 131 is smoothed, the hollow portion of the enclosure frame 132 has a shape adapted to the carbon paper, the enclosure frame 132 and the substrate 131 form a containing cavity, the depth of the enclosure frame 132 is processed according to the thickness of the carbon paper sample, the size of the enclosure frame 132 is processed according to the size of the carbon paper sample, and a plurality of air holes 1321 are evenly opened on the side wall of the enclosure frame 132 along the circumferential direction.

[0044] Reference Figure 3 One fixing component 2 corresponds to the cover plate 14, and the other fixing component 2 corresponds to the substrate 131. The cover plate 14 is located on the side of the enclosure frame 132 away from the substrate 131. The surface of the cover plate 14 is smoothly set. When the carbon paper sample is placed in the containing cavity, the person holds the handle 21 and places the cover plate 14 on the side of the enclosure frame 132 away from the substrate 131. The cover plate 14 fits with the enclosure frame 132.

[0045] The implementation principle of Example 2 is as follows: when hot pressing of carbon fiber paper is required, the substrate 131, the enclosure frame 132 and the cover plate 14 are prefabricated in the factory in advance according to the design requirements. The thickness of the enclosure frame 132 can be prefabricated according to the thickness of the carbon paper sample. Subsequently, the enclosure frame 132 is placed on the substrate 131, and the carbon paper sample is placed in the accommodating cavity. A person holds the handle 21 and covers the cover plate 14 to the side of the enclosure frame 132 away from the substrate 131 so that the cover plate 14 and the enclosure frame 132 fit together. The mold with the carbon paper sample is moved to the hot press, and the mold is placed on the hot press as required. The mold is hot pressed by the hot press to form carbon paper. After the hot pressing is completed, the person holds the handle 21 and moves the cover plate 14 to the side away from the enclosure frame 132 to take out the carbon paper.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A carbon fiber paper hot pressing mold, characterized in that: The molding die (1) is provided with a mold cavity integrally therewith, the mold cavity is used to place the carbon paper sample, and the shape of the mold cavity is adapted to the carbon paper sample; The molding die (1) comprises an upper die (11) and a lower die (12); the upper die (11) and the lower die (12) have the same length and thickness; the lower die (12) is provided with a placement groove (122) at its center for forming a cavity; the shape of the cavity is adapted to the shape of the carbon paper sample; the placement groove (122) is used to prevent the carbon paper sample, the upper die (11) and the lower die (12) from being attached; The molding die (1) further comprises a receiving plate (13) and a cover plate (14); the receiving plate (13) is located below the cover plate (14); the receiving plate (13) comprises a base plate (131) and an enclosure frame (132); the enclosure frame (132) is connected to a side of the base plate (131) close to the cover plate (14); the base plate (131) and the enclosure frame (132) form a receiving cavity for placing a carbon paper sample; the hollow portion of the enclosure frame (132) has a shape adapted to the carbon paper sample; and the cover plate (14) is fitted with the enclosure frame (132).

2. The carbon fiber paper hot pressing mold according to claim 1, characterized in that: At least one upper air guide groove (111) is provided on a side of the upper mold (11) close to the lower mold (12), and at least one lower air guide groove (121) is provided on a side of the lower mold (12) close to the upper mold (11). The upper air guide groove (111) and the lower air guide groove (121) are arranged in a mirror image, and the upper air guide groove (111) and the lower air guide groove (121) form an air guide groove.

3. The carbon fiber paper hot pressing mold according to claim 2, characterized in that: The length and depth of the upper air guide groove (111) and the lower air guide groove (121) should not be too large, and the depth of the lower air guide groove (121) is greater than the depth of the placement groove (122).

4. The carbon fiber paper hot pressing mold according to claim 1, characterized in that: The side wall of the enclosure frame (132) is evenly provided with a plurality of air holes (1321) along the circumferential direction.

5. The carbon fiber paper hot pressing mold according to claim 1, characterized in that: It also comprises two fixing components (2), one of the fixing components (2) is connected to the upper mold (11), and the other of the fixing components (2) is connected to the lower mold (12); Or one of the fixing components (2) is connected to the cover plate (14), and the other of the fixing components (2) is connected to the base plate (131).

6. The carbon fiber paper hot pressing mold according to claim 5, characterized in that: The fixing assembly (2) comprises two handles (21), wherein the two handles (21) in one of the fixing assemblies (2) are respectively located on two sides directly opposite to the upper mold (11), and the handles (21) are connected to the upper mold (11), and the two handles (21) in the other fixing assembly (2) are respectively located on two sides directly opposite to the lower mold (12), and the handles (21) are connected to the lower mold (12); Or the two handles (21) in one of the fixing components (2) are respectively connected to two opposite sides of the cover plate (14), and the two handles (21) in the other fixing component (2) are respectively connected to two opposite sides of the base plate (131).

Images