Spherical carbon fiber plate batch forming structure

Abstract

The utility model relates to a spherical carbon fiber plate batch forming structure which comprises an upper die plate and a lower die plate, the upper die plate protrudes outwards to form a spherical protrusion, the lower die plate sinks inwards to form a spherical groove, the spherical protrusion and the spherical groove are oppositely arranged, and a plurality of thickness limiting frames and a plurality of thin steel plates are arranged between the upper die plate and the lower die plate. A thin steel plate is arranged between every two adjacent thickness limiting frames, or a thin steel plate is arranged on the side, close to the lower die plate, of each thickness limiting frame. The prepreg is arranged in the thickness limiting frame and is positioned on the thin steel plate; and the upper mold plate is pressed downwards, and the spherical protrusions enable all the thin steel plates to stretch out so as to form a spherical surface on the prepreg. A plurality of products can be formed through one set of mold and one-time heating and curing; products with different thicknesses can be formed through one-time processing; the investment of molds can be reduced through batch production, and the production efficiency is improved; the surface smoothness of the product can be ensured by adopting thin steel plates; profiling paving in a forming cavity is not needed, and only paving on a thin steel plate is needed, so that the paving time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of production and manufacturing of carbon fiber plates, in particular to a spherical carbon fiber plate batch molding structure. Background Art

[0002] Carbon fiber board is a high-performance material made by compounding carbon fiber and resin matrix through a special processing technology. It has broad application prospects in aerospace, automobile manufacturing, sporting goods and building reinforcement.

[0003] The shape of the spherical carbon fiber plate product is the highest in the middle and the lowest at the four corners. It is usually used in the fields of medical, automotive, aerospace, etc. The existing technology requires laying the prepreg layer by layer on the mold, laying 3-4 layers of prepreg each time, pre-pressing once, and laying until the required thickness of the product, and then transporting it to the press for heating and pressurization curing. This method relies on the mold laying, and only one can be produced at a time. If batch production is required, many sub-molds need to be manufactured and energy consumption is high. Laying on the mold also wastes time. The hemispherical carbon plate manufactured in this way is very expensive and the manufacturing efficiency is also very low, and large-scale production cannot be achieved. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a spherical carbon fiber plate batch molding structure which can realize batch production and has low cost.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a spherical carbon fiber plate batch molding structure, comprising an upper template and a lower template, the upper template protrudes outward to form a spherical protrusion, the lower template is recessed inward to form a spherical groove, the spherical protrusion and the spherical groove are arranged opposite to each other, a plurality of thickness limiting frames and a plurality of thin steel plates are arranged between the upper template and the lower template, a thin steel plate is arranged between two adjacent thickness limiting frames or a thin steel plate is arranged on the side of each thickness limiting frame close to the lower template; the prepreg is arranged in the thickness limiting frame and on the thin steel plate; the upper template is pressed downward, and the spherical protrusion makes all the thin steel plates extend toward the spherical groove to form a spherical surface on the prepreg.

[0006] More specifically, the thicknesses of the plurality of thickness limiting frames are the same, or the thickness of at least one thickness limiting frame is different from the thicknesses of the other thickness limiting frames.

[0007] More specifically, the thickness of the thickness limiting frame is 0.5 mm-5 mm.

[0008] More specifically, the thickness of the thickness limiting frame is the same as 2 mm.

[0009] More specifically, the thickness of the thin steel plate is 0.2 mm to 0.8 mm.

[0010] More specifically, the thickness of the thin steel plate is 0.5 mm.

[0011] More specifically, relative positioning holes are arranged around the upper template, the lower template, the thickness limiting frame and the thin steel plate, and a positioning rod is inserted into the relative positioning hole.

[0012] More specifically, the thickness limiting frame is made of carbon plate or glass fiber material.

[0013] More specifically, the prepreg is formed by stacking a plurality of layers of carbon fiber prepreg cloths, and two adjacent layers of the carbon fiber prepreg cloths are laid with a rotation of 90 degrees.

[0014] More specifically, the number of the thickness limiting frames is ten, and the number of the thin steel plates is nine.

[0015] The beneficial effects of the utility model are as follows: adopting the above structure, a set of molds can be used for batch production, and multiple products can be formed by one heating and curing; at the same time, products of different thicknesses can also be formed by one processing; batch production can reduce the investment in molds and improve production efficiency; the use of thin steel plates can ensure a smooth product surface; there is no need to lay the product in a contoured manner in the molding cavity, but only need to lay it on the thin steel plate, which greatly reduces the laying time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the thickness limiting frame of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the thin steel plate of the utility model.

[0019] In the figure: 1. upper template; 2. lower template; 3. thickness limit frame; 4. thin steel plate; 5. positioning hole. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figure 1 , Figure 2 and Figure 3 A spherical carbon fiber plate batch molding structure is shown, comprising an upper template 1 and a lower template 2, wherein one side of the upper template 1 protrudes outward to form a spherical protrusion, and one side of the lower template 2 is recessed inward to form a spherical groove. In use, the spherical protrusion and the spherical groove are arranged opposite to each other, and at the same time, a cavity is formed between the spherical protrusion and the spherical groove, and the cavity is used to mold products; here, although the cavity is designed for a spherical surface, some anisotropic cavities can also be realized by setting different protrusions and grooves, and the two are similar designs. For example, the cavity can be spherical, hemispherical, trapezoidal, triangular, wavy, etc.

[0024] Based on this, in order to realize batch processing, a plurality of thickness limiting frames 3 are arranged between the upper template 1 and the lower template 2, and a thin steel plate 4 is arranged between each adjacent thickness limiting frame 3, that is, the arrangement form from top to bottom is upper template 1, thickness limiting frame 3, thin steel plate 4, thickness limiting frame 3, thin steel plate 4, ..., thickness limiting frame 3, thin steel plate 4, limiting frame 3, lower template 2; or, a thin steel plate 4 is arranged on the side of each thickness limiting frame 3 close to the lower template 2, that is, the arrangement form from top to bottom is upper template 1, thickness limiting frame 3, thin steel plate 4, thickness limiting frame 3, thin steel plate 4, ..., thickness limiting frame 3, thin steel plate 4, lower template 2.

[0025] A chamber is formed between the thickness limiting frame 3 and the thin steel plate 4. During production, the prepreg is arranged in the chamber, that is, the prepreg is located in the thickness limiting frame 3 and on the thin steel plate 4. The thin steel plate 4 has the function of supporting the prepreg, and the thickness limiting frame 3 has the function of ensuring the thickness of the product. After the setting is completed, the upper template 1 is pressed downward, and the spherical protrusion makes all the thin steel plates 4 extend toward the spherical groove to form a spherical surface on the prepreg.

[0026] For the thickness limiting frame 3, the model of the thickness limiting frame 3 can be replaced according to actual needs, and different models correspond to different thicknesses; in a one-time molding process, thickness limiting frames 3 of the same thickness can be used, or thickness limiting frames 3 of different thicknesses can be used; some models of the thickness limiting frames 3 can be the same, and the remaining models can be different, or the model of each thickness limiting frame 3 can be different; according to actual usage requirements, the thickness of the thickness limiting frame 3 can be controlled within 0.5mm-5mm, and the preferred thickness according to the present embodiment is 2mm.

[0027] Here, if a thickness limiting frame 3 made of metal is used, due to the low molding pressure, the thickness limiting frame 3 cannot be attached to the mold in shape, which will lead to insufficient product pressure, surface defects, and uneven thickness. Therefore, the thickness limiting frame 3 is made of carbon fiber board or glass fiber. During use, it is necessary to apply a layer of release agent on the surface of the thickness limiting frame 3 and the thin steel plate 4 to prevent sticking to the mold; the thickness limiting frame 3 will soften after heating and fit more closely to the mold, thereby ensuring the thickness of the product. When the prepreg is placed in the thickness limiting frame 3, the prepreg will be 10 mm away from the inner wall of the thickness limiting frame 3 to facilitate the deformation of the thickness limiting frame 3; when cooled to room temperature, the thickness limiting frame 3 will return to its original state, thereby achieving repeated recycling.

[0028] For the thin steel plate 4, the thickness of the thin steel plate 4 can be selected according to the deformation degree of the actual cavity. The thickness of the thin steel plate 4 ranges from 0.2mm to 0.8mm. When the cavity is more complicated, a thinner thin steel plate 4 can be selected to obtain a better quality of the formed product. When the cavity is not complicated, a slightly thicker thin steel plate 4 can be selected to ensure the supporting force. In this embodiment, a thin steel plate 4 with a thickness of 0.5mm is preferred. The material of the thin steel plate 4 can also be selected according to the actual situation, and some materials that are convenient for deformation can be selected.

[0029] There are two situations in which the thin steel plate 4 can be used. In the first situation, the thin steel plate 4 can be used repeatedly, that is, after the thin steel plate 4 is formed into a product for the first time, a contoured structure will be formed on its surface, and the thin steel plate 4 can continue to be used to process the same product; in the second situation, the thin steel plate 4 is used once, that is, the thin steel plate 4 is replaced after one forming, and each time it is used, it is a flat structure, which can have a better supporting effect when laying prepreg and improve the laying efficiency.

[0030] In order to further ensure that the various components can be aligned during use, relative positioning holes 5 are provided around the upper template 1, the lower template 2, the thickness limit frame 3 and the thin steel plate 4, and a positioning rod (not shown) is inserted into the relative positioning hole 5 to ensure the relative positions of the various components, thereby ensuring the processing quality of the product.

[0031] In this embodiment, the number of the limiting frames 3 is ten, and the number of the thin steel plates 4 is nine.

[0032] Based on the above structure, the method for preparing the spherical carbon fiber plate is as follows:

[0033] 1. Prepare prepreg, which is composed of several layers of carbon fiber prepreg cloth, and the two adjacent layers of carbon fiber prepreg cloth are rotated 90° for laying; place the first piece of carbon fiber prepreg cloth flat on a clean table platform along the 90° direction, and tear off the plastic film on the upper surface, lay the second piece of carbon fiber prepreg cloth along the 0° direction on the upper surface of the first piece of carbon fiber prepreg cloth and tear off the plastic film, fit it tightly with the first layer according to the outer dimensions, and then alternately lay symmetrically at 90° / 0° / 90° / 0° / 90° / 0° / 90° / 0° / 90° / 0° / 90° / 0° / 90° in sequence, for a total of 14 layers, each layer is 0.15 mm, and the total thickness is 2.1 mm.

[0034] 2. Pre-press the prepreg, lay 10 pieces of the same prepreg at one time, this process can be completed on the work surface, without the aid of the forming structure of the utility model, and then use the roller machine to compact the prepreg for standby use.

[0035] 3. Mold assembly: first clean the upper template 1, thickness limit frame 3, thin steel plate 4 and lower template 2, ensure that the surface is clean and free of foreign matter, and apply release agent. Place the lower template 2 first, then the thin steel plate 4, prepreg, and thickness limit frame 3 in sequence for 10 times, then place the upper template 1. Finally, insert the positioning rod into the positioning hole 5 to complete the assembly.

[0036] 4. To cure the product, set the heating temperature of the molded product to 150°C, the pressure to 0.8Mpa, and the time to 20min. Install the mold on the press for heating and pressurizing for curing and molding. The curing pressure should not be too large or too small. Too large a pressure will cause the product to twist and deform, while too small a pressure will cause surface defects and poor compaction. Therefore, the molding pressure of the press is controlled at around 0.8Mpa.

[0037] 5. After the product is formed and solidified, wait until the internal temperature of the mold cools down to below 100°C, then disassemble the mold and take out the product.

[0038] In summary, the present structure can realize that one set of molds can be used to form 10 products through one heating and curing process; different thickness limit frames 3 can be selected as needed, so as to form products of different thicknesses at one time; the investment in molds can be reduced while improving production efficiency; the use of thin steel plates 4 can ensure that the product surface is smooth and has a certain supporting force, and it only needs to be laid on the thin steel plates 4, which greatly reduces the laying time and improves the laying efficiency; the thickness limit frame 3 uses carbon fiber plates or glass fiber materials, which will soften during the processing and stick to the mold to ensure better uniformity of the thickness of the same product.

[0039] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A spherical carbon fiber plate batch molding structure, comprising an upper template (1) and a lower template (2), wherein the upper template (1) protrudes outward to form a spherical protrusion, and the lower template (2) is recessed inward to form a spherical groove, and the spherical protrusion and the spherical groove are arranged opposite to each other, characterized in that: A plurality of thickness limiting frames (3) and a plurality of thin steel plates (4) are arranged between the upper template (1) and the lower template (2); a thin steel plate (4) is arranged between two adjacent thickness limiting frames (3) or a thin steel plate (4) is arranged on a side of each thickness limiting frame (3) close to the lower template (2); the prepreg is arranged in the thickness limiting frame (3) and on the thin steel plates (4); the upper template (1) is pressed downward, and the spherical protrusion makes all the thin steel plates (4) extend toward the spherical groove to form a spherical surface on the prepreg.

2. The spherical carbon fiber plate batch molding structure according to claim 1, characterized in that: The thicknesses of several thickness limiting frames (3) are the same, or the thickness of at least one thickness limiting frame (3) is different from the thicknesses of the other thickness limiting frames (3).

3. The spherical carbon fiber plate batch molding structure according to claim 1, characterized in that: The thickness of the thickness limiting frame (3) is 0.5 mm to 5 mm.

4. The spherical carbon fiber plate batch molding structure according to claim 3, characterized in that: The thickness of the thickness limiting frame (3) is the same as 2 mm.

5. The spherical carbon fiber plate batch molding structure according to claim 1, characterized in that: The thickness of the thin steel plate (4) is 0.2 mm to 0.8 mm.

6. The spherical carbon fiber plate batch molding structure according to claim 5, characterized in that: The thickness of the thin steel plate (4) is 0.5 mm.

7. The spherical carbon fiber plate batch molding structure according to claim 1, characterized in that: Relative positioning holes (5) are arranged around the upper template (1), the lower template (2), the thickness limiting frame (3) and the thin steel plate (4), and a positioning rod is inserted into the relative positioning hole (5).

8. The spherical carbon fiber plate batch molding structure according to claim 1, characterized in that: The thickness limiting frame (3) is made of carbon fiber plate or glass fiber material.

9. The spherical carbon fiber plate batch molding structure according to claim 1, characterized in that: The prepreg is formed by stacking a plurality of layers of carbon fiber prepreg cloths, and two adjacent layers of the carbon fiber prepreg cloths are laid with a rotation of 90 degrees.

10. The spherical carbon fiber plate batch molding structure according to claim 1, characterized in that: The number of the thickness limiting frames (3) is ten, and the number of the thin steel plates (4) is nine.

Images