Plate preparation method, radiator grille and vehicle

Abstract

The invention relates to a preparation method of a plate, a radiator grille and a vehicle. The preparation method of the plate comprises the following steps: uniformly mixing the degradable epoxy resin, the reinforcing material, the glass beads, the filler, the initiator, the cross-linking agent, the thickening agent, the low-shrinkage additive, the internal release agent and the diluent to obtain resin paste; forming a glass fiber mat on the polyester film; impregnating a glass fiber mat with the resin paste, laying a polyester film on the surface of the resin paste, and pressing to form a sheet; and carrying out compression molding on the basis of the sheet to obtain the plate. The degradable epoxy resin is combined with the introduced glass beads, the initiator, the cross-linking agent and the like, so that the compatibility between the degradable epoxy resin and all the materials can be improved, compared with a traditional SMC product, the light weight of the product is facilitated, the appearance quality of the product is high, the defects such as shrinkage marks and bubbles are few, the tensile strength meets the design requirement, and the service life of the product is prolonged. Carbon emission can be reduced, and environmental protection is facilitated.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method for preparing a plate, a front cover and a vehicle. Background Art

[0002] SMC (Sheet molding compound) has been widely developed and applied in commercial vehicles due to its excellent mechanical properties and advantages of automated production. As countries become more aware of environmental protection and reduce environmental pollution, products that cannot be effectively controlled or recycled will inevitably be restricted. Therefore, the development of degradable and recyclable thermosetting resin-based composite materials will be one of the research areas. Summary of the invention

[0003] The present application provides a method for preparing a plate, a front cover and a vehicle to solve the deficiencies in the related art.

[0004] According to a first aspect of an embodiment of the present application, there is provided a method for preparing a plate, comprising:

[0005] uniformly mixing a degradable epoxy resin, a reinforcing material, glass microspheres, a filler, an initiator, a cross-linking agent, a thickener, a low shrinkage additive, an internal mold release agent and a diluent to obtain a resin paste;

[0006] forming a fiberglass mat on a polyester film;

[0007] After the resin paste is impregnated into the glass fiber mat, a polyester film is laid flat on the surface of the resin paste to form a sheet by pressing;

[0008] The sheet material is compression molded to obtain the plate material.

[0009] Optionally, also include:

[0010] The degradable epoxy resin is prepared by using terephthalaldehyde, L-phenylglycine amide and epoxy resin E51.

[0011] Optionally, the resin paste satisfies at least one of the following conditions:

[0012] 100-120 parts by weight of degradable epoxy resin;

[0013] The degradable epoxy resin comprises 100 parts of epoxy resin E51, 30-40 parts of phthalaldehyde and 20-30 parts of L-phenylglycine amide;

[0014] The filler includes carbon calcium, and the content of the carbon calcium is 50-70 parts by weight;

[0015] The low shrinkage additive comprises polystyrene PS and polymethacrylic acid PMMA, and the content of the low shrinkage additive is about 30 parts by weight;

[0016] The initiator comprises one or both of tert-butyl perbenzoate and benzoyl peroxide, and the content of the initiator is 20 parts by weight;

[0017] The diluent includes 10-20 parts by weight of styrene;

[0018] The internal mold release agent includes 2-3 parts by weight of zinc stearate;

[0019] The thickener comprises 3-5 parts by weight of magnesium oxide;

[0020] The glass microsphere content is 10-15 parts by weight

[0021] The content of other additives is 0.2-0.5 parts by weight;

[0022] The glass fiber mat includes glass fibers, and the glass fibers are about 70-80 parts by weight.

[0023] Optionally, the sheet material is subjected to compression molding to obtain a plate material, comprising:

[0024] Applying a release agent to the mold cavity of the upper mold and the mold cavity of the lower mold respectively;

[0025] Preheating the upper mold and the lower mold to respective molding temperatures;

[0026] Adding the sheet into the mold cavity of the upper mold and the mold cavity of the lower mold;

[0027] After the upper mold and the lower mold are molded together, a first pressurization is performed according to a first molding pressure;

[0028] After the pressure is released, pressurizing is performed for the second time according to the second molding pressure;

[0029] The plate is demoulded to obtain the plate.

[0030] According to a second aspect of an embodiment of the present disclosure, there is provided a front mask, comprising:

[0031] Inner panels;

[0032] An outer panel, a first side of which forms at least a portion of the appearance of the front mask, and an inner panel is connected to a second side of the outer panel facing away from the first side. The inner panel and / or the outer panel are prepared by the preparation method described in any of the aforementioned embodiments.

[0033] Optionally, the outer panel includes a first arc-shaped area, a second arc-shaped area and a third arc-shaped area, the second arc-shaped area is connected to the first arc-shaped area and the third arc-shaped area respectively, and the second arc-shaped area is located between the first arc-shaped area and the third arc-shaped area.

[0034] Optionally, the outer panel further comprises a plurality of first reinforcing ribs arranged side by side and in parallel, each first reinforcing rib extending from a top edge of the outer panel in the height direction to the other opposite side.

[0035] Optionally, multiple first reinforcing ribs are divided into first area ribs, second area ribs and third area ribs, the second area ribs are located between the first area ribs and the third area ribs, and the length of the first reinforcing rib of the first area rib is greater than the length of the first reinforcing rib of the second area rib, and the length of the first reinforcing rib of the third area rib is greater than the length of the first reinforcing rib of the second area rib.

[0036] Optionally, the outer panel further includes a second reinforcing rib, wherein the second reinforcing rib extends along a parallel direction of the first reinforcing ribs, and the second reinforcing rib is respectively connected to each of the first reinforcing ribs.

[0037] Optionally, the inner plate comprises a first polygonal boss and a second polygonal boss protruding away from the outer plate, and the first polygonal boss and the second polygonal boss are arranged side by side on both sides of the inner plate;

[0038] At least one side edge of the first polygonal boss is disposed close to the corresponding side edge of the inner plate, and at least one side edge of the second polygonal boss is disposed close to the corresponding side edge of the inner plate.

[0039] Optionally, the first polygonal boss and / or the second polygonal boss is provided with a central recess and a second weight-reducing opening provided in the central recess, and the inner panel further comprises at least one second reinforcing boss provided in the central recess area; or,

[0040] The inner plate further includes a third reinforcing boss provided on the surface of the first polygonal boss and / or the surface of the second polygonal boss; or,

[0041] The inner plate further includes a third polygonal boss and a fourth polygonal boss disposed between the first polygonal boss and the second polygonal boss, and the third polygonal boss is located between the fourth polygonal boss and the first polygonal boss; or

[0042] The inner plate further includes a convex rib protruding away from the outer plate, wherein the extending direction of the convex rib is substantially parallel to the parallel direction of the first polygonal boss and the second polygonal boss, and the convex rib is arranged close to the bottom edge of the inner plate.

[0043] Optionally, in the height direction of the front mask, the inner panel includes a protruding portion protruding from the outer panel, and a side of the protruding portion facing away from the outer panel is provided with a plurality of oblique ribs inclined relative to the height direction of the inner panel.

[0044] Optionally, the plurality of oblique ribs are divided into a first row of oblique ribs and a second row of oblique ribs, the inclination direction of the first row of oblique ribs is opposite to the inclination direction of the second row of oblique ribs, and the first row of oblique ribs and the second row of oblique ribs are arranged to intersect each other;

[0045] Alternatively, the inner panel further includes a strip rib provided on the protruding portion, the strip rib extending from one side of the protruding portion to the other side, the oblique ribs being provided on both sides of the strip rib respectively, and the multiple oblique ribs located on either side of the strip rib include a first oblique rib and a second oblique rib having opposite inclination directions, and the first oblique rib and the second oblique rib are alternately arranged.

[0046] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising a front cover as described in any one of the above embodiments.

[0047] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0048] The present application improves the compatibility between the degradable epoxy resin and various materials by combining the glass beads, initiator and cross-linking agent introduced by the degradable epoxy resin. Compared with traditional SMC products, it is beneficial to the lightweight of the products. The products have high apparent quality, less defects such as shrinkage and bubbles, and the tensile strength meets the design requirements. It can also reduce carbon emissions and is beneficial to environmental protection.

[0049] It can be seen from the above embodiments that in the technical solution of the present application, it should be understood that the above general description and the following detailed description are only exemplary and explanatory and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0051] Figure 1 The present invention is a flow chart of a method for preparing a plate according to an exemplary embodiment.

[0052] Figure 2 is based on Figure 1 A product appearance diagram of an embodiment obtained by the preparation method.

[0053] Figure 3 is based on Figure 1 A product appearance diagram of another embodiment obtained by the preparation method.

[0054] Figure 4 The figure is a schematic structural diagram of a front mask according to an exemplary embodiment.

[0055] Figure 5 It is a schematic structural diagram of an outer panel according to an exemplary embodiment.

[0056] Figure 6 yes Figure 5 Partial schematic diagram of the middle and outer panels.

[0057] Figure 7 It is a schematic structural diagram of an inner panel according to an exemplary embodiment.

[0058] Figure 8 yes Figure 7 Schematic diagram of the structure of the middle inner panel from another angle.

[0059] Fig. 9 yes Figure 7 Partial schematic diagram of the middle inner panel.

[0060] Fig.10 is a schematic diagram of a bending mode simulation of a front mask according to an exemplary embodiment.

[0061] Fig.11 is a schematic diagram of a torsional mode simulation of a front mask according to an exemplary embodiment.

[0062] Fig.12 is a schematic diagram showing the displacement of the front mask stiffness according to an exemplary embodiment.

[0063] Fig.13 is a strength diagram showing the stiffness of the front mask according to an exemplary embodiment.

[0064] Fig.14 It is a schematic diagram showing stress variation of a front mask in a vertical bending condition according to an exemplary embodiment.

[0065] Fig.15 It is a schematic diagram showing stress variation of a front mask under a lateral bending condition according to an exemplary embodiment.

[0066] Fig.16 The figure is a schematic diagram showing stress changes of a front cover under emergency braking conditions according to an exemplary embodiment.

[0067] Description of Reference Numerals

[0068] 1. Inner plate; 11. First polygonal boss; 12. Second polygonal boss; 13. Middle depression; 14. Second weight-reducing opening; 15. Second reinforcing boss; 16. Third reinforcing boss; 17. Third polygonal boss; 18. Fourth polygonal boss; 19. Symmetrical boss; 101. Convex rib; 102. Protruding portion; 103. Oblique rib; 104. Strip rib; 2. Outer plate; 21. First arc-shaped area; 22. Second arc-shaped area; 23. Third arc-shaped area; 24. Depressed groove; 25. First weight-reducing opening; 26. First reinforcing rib; 261. First rib area; 262. Second rib area; 263. Third rib area. DETAILED DESCRIPTION

[0069] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0070] The front mask and the method for making the same are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0071] Figure 1 is a flow chart of a method for preparing a plate according to an exemplary embodiment, such as Figure 1 As shown, the preparation method may include the following steps:

[0072] In step 101, a degradable epoxy resin, a reinforcing material, glass microspheres, a filler, an initiator, a cross-linking agent, a thickener, a low shrinkage additive, an internal mold release agent, and a diluent are uniformly mixed to obtain a resin paste.

[0073] In this embodiment, the degradable epoxy resin may include terephthalaldehyde, L-phenylglycine amide and epoxy resin E51. For example, terephthalaldehyde, L-phenylglycine amide and epoxy resin E51 may be used as main components for synthesis in advance to generate the degradable epoxy resin. For example, in the formula material of the resin paste, the content of the degradable epoxy resin may be between 100 and 200 parts by weight. The degradable epoxy resin may include 100 parts of epoxy resin E51, 30-40 parts of terephthalaldehyde and 20-30 parts of L-phenylglycine amide. Of course, in addition to terephthalaldehyde, L-phenylglycine amide and epoxy resin E51, the degradable epoxy resin may also include some other components in small amounts.

[0074] The filler comprises calcium carbon, and the content of the calcium carbon is 50-70 parts by weight; the low shrinkage additive is polystyrene PS and polymethacrylate PMMA, and the mixed liquid obtained by mixing the polystyrene PS and polymethacrylate PMMA is used as the low shrinkage additive, and the low shrinkage additive is about 30 parts by weight; the initiator comprises one or both of tert-butyl perbenzoate and benzoyl peroxide, and the content of the initiator is about 20 parts by weight; the diluent comprises 10-20 parts by weight of styrene; the release agent comprises 2-3 parts by weight of zinc stearate; the thickening agent comprises 3-5 parts by weight of magnesium oxide; the glass fiber mat comprises glass fiber, and the content of the glass fiber is 70-80 parts by weight; the content of glass microbeads is 10-15 parts by weight, and the content of other additives is 0.2-0.5 parts by weight.

[0075] During the mixing process, the raw materials can be weighed according to the above content, and then a certain proportion of the formula weight of the degradable epoxy resin is added into the barrel, and then the formula weight of the low shrinkage agent is added into the barrel, and stirred for 5-10 minutes; then the formula weight of the initiator is added and stirred for 3-5 minutes; then the formula weight of the internal release agent is added and stirred for 4-7 minutes; then the proportion of the weight of the filler is added and stirred for 15-20 minutes; then the formula weight of the diluent and other additives are added and stirred for 3-5 minutes; then the proportion of the weight of the thickener is added and stirred for 5-7 minutes to form a resin paste. The above stirring operations can all be stirred by a stirrer at a certain stirring frequency, and the stirring frequencies of each step can be the same or different.

[0076] In step 102, a glass fiber mat is formed on a polyester film.

[0077] In step 103, after the resin paste is impregnated into the fiberglass mat, a polyester film is laid flat on the surface of the resin paste to form a sheet by pressing.

[0078] In this embodiment, a polyester film may be laid flat first, and then dry glass fibers may be laid on the polyester film, thereby obtaining a glass fiber mat formed on the polyester film. Then, a scraper may be used to evenly apply resin paste on the glass fiber mat, so that the glass fiber mat is impregnated with the resin paste. The resin paste may be applied in multiple layers, for example, about 15 to 18 layers. Then, a polyester film may be laid flat on the surface of the applied resin paste and pressed to form a sheet.

[0079] In step 104, compression molding is performed based on the sheet material to obtain the plate material.

[0080] In this embodiment, the formed sheet can be molded to obtain a plate of a target shape. Taking the front cover of a vehicle as an example, the preparation method has a great influence on the product performance, and it is necessary to adopt optimized and reasonable process conditions and equipment process parameters to obtain high-quality product effects.

[0081] Therefore, in the process of preparing the front mask, the mold release agent can be first applied to the mold cavity of the upper mold and the mold cavity of the lower mold respectively, and the mold release agent can be evenly applied to the mold cavity surface of the upper mold and the lower mold, and then the upper mold and the lower mold coated with the mold release agent are preheated to their respective molding temperatures, such as the molding temperature of the upper mold is set to 140℃~145℃, and the molding temperature of the lower mold is set to 135℃-140℃. After that, the sheet is added to the mold cavity of the upper mold and the mold cavity of the lower mold, and the feeding area is about 80% of the mold cavity area; then after the upper mold and the lower mold are closed, the sheet solid is turned into a volume, and then the first pressurization is performed according to the first molding pressure. As the cross-linking reaction proceeds, the curing time is continuously optimized to increase the molecular weight of the resin, and the degree of curing is increased accordingly, and finally a solid state is formed; after the first pressurization is completed, the second pressurization can be performed according to the second molding pressure after the pressure is released, and the solid state becomes a melt again. After the second pressurization is completed, the plate can be demolded to obtain the plate.

[0082] Among them, the first molding pressure is in the range of 15MPa-25MPa, and the second molding pressure is in the range of 10MPa-20MPa; and / or, the sum of the duration of the first pressurization and the second pressurization is in the range of 180s-200s. During the demolding process, the mold can be cooled to 50℃-70℃ inside and outside before demolding. Forming the sheet by secondary pressurization can improve product quality. The structure required to be formed on the front mask can be obtained by designing the mold cavities of the upper mold and the lower mold respectively.

[0083] According to the above preparation method, by specifically adjusting the primary product process parameters and components, 5 kinds of example plates were prepared, and plates prepared with traditional SMC composite materials were used as a resistance comparison example. The specific process preparation parameters are shown in Table 1 below:

[0084] Process parameters Comparative Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Upper mold forming temperature 150℃ 150℃ 145℃ 145℃ 145℃ 140℃ Lower mold molding temperature 148℃ 148℃ 140℃ 140℃ 140℃ 135℃ First molding pressure 22MPa 22MPa 22MPa 22MPa 22MPa 22MPa Second molding pressure 0MPa 0MPa 0MPa 18MPa 18MPa 18MPa Molding time 200s 200s 200s 200s 180s 180s

[0085] Table 1

[0086] The performance results of the above comparative examples are shown in Table 2 below:

[0087]

[0088] Table 2

[0089] Example 2 and Comparative Example 1 only change the material formula, and other process parameters do not change. It is found that after the parts are prepared, a large number of bubbles and gel defects appear on the surface quality of the board in Example 2, and the strength of the obtained board product is also greatly reduced. Therefore, it is suitable for the process parameters of traditional SMC, but not suitable for a biodegradable epoxy resin-based composite material combined with glass fiber.

[0090] In Example 3, the upper mold forming temperature and the lower mold forming temperature are lowered on the basis of Comparative Example 1. When the forming temperatures of the upper mold and the lower mold are lowered, the surface glossiness of the sheet product of Example 3 is significantly increased, indicating that the higher the temperature of the degradable epoxy resin-based composite material combined with glass fiber under the condition of complete curing, the larger the gap formed between the epoxy resin and the low shrinkage agent interface after curing and cooling, and thus the more obvious the anti-shrinkage effect. However, in addition to reducing the shrinkage rate of the sheet product, too high a molding temperature is also likely to cause spots and bubbles on the surface of the product, and lose gloss. However, if the upper mold forming temperature and the lower mold forming temperature are too low, the cross-linking and curing of the material is incomplete, the strength is affected, and defects will also occur on the surface of the product. Selecting appropriate upper mold forming temperature and lower mold forming temperature can improve the surface defects such as corrugation and gel of the product.

[0091] Example 4 adds a second pressurizing operation on the basis of Comparative Example 1. Through the adjustment of multiple pressures, it is found that the apparent quality of the sheet product of Example 4 is significantly improved. The role of increasing the molding pressure is to overcome the vapor pressure generated by the volatiles generated by the molded material due to the increase in temperature, avoid defects such as bubbles, delamination, and loose structure of the product, close the mold so that the product has a fixed size, shape and minimum flash, and prevent the product from deformation due to shrinkage.

[0092] Example 5 reduces the molding time based on Example 4. The main reason is that appropriately extending the curing time of the resin system will slightly improve the surface gloss of the product. At the same time, the cross-linking degree of the resin system is increased, which can inhibit the warping and deformation of the product.

[0093] Example 6 reduces the upper mold molding temperature and the lower mold molding temperature based on Example 5. The main purpose is to appropriately reduce the molding temperature, which can not only reduce the shrinkage rate of the product and improve the product appearance quality, but also reduce energy waste and increase the mold life value. Figure 2 This is the product appearance picture of Example 2. Figure 3 This is the product appearance picture of Example 6, compared with Figure 2 and Figure 3 It can be seen that by changing the process parameters, the product appearance can be greatly improved.

[0094] It can be seen from the performance results of the embodiment and the appearance of the product that: through the actual molding trial production process, when preparing the board for the composite material of the degradable epoxy resin-based glass fiber, the key factors for improving the quality start-up effect mainly include the upper mold molding temperature, the lower mold molding temperature, the segmented molding pressure and the significant influence of the molding time on the bubbles and gel. Of course, the molding time mainly affects the production rhythm of the product. Therefore, in order to improve the molding efficiency and reduce the molding rhythm, it is also crucial to reasonably control and optimize the molding time, thereby improving the molding production efficiency and shortening the molding time. Moreover, by combining the glass microbeads, initiators and cross-linking agents introduced by the degradable epoxy resin, the compatibility between the degradable epoxy resin and each material can be improved, and the lightweight of the product can be achieved. Compared with traditional SMC products, it can reduce weight by more than 18%, and the product has high apparent quality, no shrinkage, no defects such as bubbles, and tensile strength ≥ 75MPa. Moreover, the use of degradable epoxy resin can reduce carbon emissions by more than 40%.

[0095] Based on the above preparation method, the present disclosure also provides a front mask, for example, Figure 4 As shown, the front mask includes an inner panel 1 and an outer panel 2, a first side of the outer panel 2 forms at least a part of the appearance surface of the front mask, and the inner panel 1 is connected to a second side of the outer panel 2 away from the first side. At least one of the inner panel 1 and the outer panel 2 can be prepared by the preparation method described in any of the above embodiments, and after the inner panel 1 and the outer panel 2 are formed, the two are fixedly connected to obtain a front mask structure. The front mask formed by connecting the inner panel 1 and the outer panel 2 is conducive to improving the overall rigidity and strength compared to the front mask structure of a single-plate structure.

[0096] In some embodiments, considering the fit between the front mask and the vehicle body, such as Figure 5 As shown, the outer panel 2 may include a first arcuate area 21, a second arcuate area 22 and a third arcuate area 23, wherein the second arcuate area 22 is connected to the first arcuate area 21 and the third arcuate area 23 respectively, and the second arcuate area 22 is located between the first arcuate area 21 and the third arcuate area 23; the height of the first arcuate area 21 is substantially the same as the height of the outer panel 2, and the height may be substantially understood as the length of the first arcuate area 21 and the outer panel 2 in the height direction of the vehicle; similarly, the height of the second arcuate area 22 and the height of the third arcuate area 23 are substantially equal to the height of the first arcuate area 21, and as shown in FIG. Figure 3 In the direction from left to right, the first arc-shaped area 21, the second arc-shaped area 22 and the third arc-shaped area 23 cover the entire area of ​​the outer plate 2 in this direction.

[0097] Based on the equal radius condition, the first arc zone 21 and the third arc zone 23 have the same curvature, which can also be understood as the center angle formed by the arc segments of the first arc zone 21 and the center angle formed by the arc segments of the third arc zone 23 can be equal or unequal. For example, the center angle formed by the second arc zone 22 can be in the range of 130°-150°, and the center angle formed by the first arc zone 21 and the third arc zone 23 can be in the range of 100°-120°, that is, the first arc zone 21 and the third arc zone 23 can be more "steeper" than the second arc zone 22.

[0098] In order to install the car logo, the outer panel 2 is provided with a recessed groove 24 which is recessed inward from the side away from the inner panel 1. The recessed depth of the recessed groove 24 can be about 25mm-40mm, and a plurality of mounting holes are arranged in the recessed groove for assembling the car logo. At the same time, in order to reduce the weight of the front mask, the outer panel 2 also includes a first weight reduction opening 25 which runs through the bottom of the recessed groove 24. The shape of the first weight reduction opening 25 can be adaptively designed according to the shape of the recessed groove 24 and the requirements for installing the car logo, such as Figure 3 As shown in , the first weight-reducing opening 25 may be similar to a conical structure. Of course, in other embodiments, the first weight-reducing opening 25 may also be circular or polygonal or other irregular shapes, and the present disclosure does not limit this.

[0099] In order to ensure the installation strength between the outer panel 2 and the inner panel 1, the recessed groove 24 can usually be arranged close to the top edge of the outer panel 2, that is, the outer panel 2 is arranged closer to the edge of the roof. At the top edge of the outer panel 2, a plurality of screw columns can also be arranged. For example, ten screw columns can be arranged, and the inner panel 1 and the outer panel 2 are subsequently connected and fixed by connecting bolts in the screw columns. In addition, during the vehicle manufacturing process, the front mask needs to have the function of rotating relative to the vehicle body, and is usually flipped based on the top design axis of the front mask closer to the roof. Therefore, based on this functional design requirement, a higher strength requirement is put forward for the top edge of the outer panel 2, and the arrangement of multiple screw columns can be considered to be, to a certain extent, adding a reinforcement structure to the top edge of the outer panel 2 to improve the strength of the top edge of the outer panel 2.

[0100] Of course, in order to further enhance the strength of the top edge of the outer plate 2, as Figure 6As shown, the outer panel 2 also includes a plurality of first reinforcing ribs 26 arranged in parallel side by side, and each first reinforcing rib 26 extends from the top edge of the outer panel 2 in the height direction to the other opposite side, so as to improve the strength of the top edge of the outer panel 2 to ensure the strength requirement of the front mask. The plurality of first reinforcing ribs 26 can be divided into first area ribs 261, second area ribs 262 and third area ribs 263, and the second area ribs 262 are located between the first area ribs and the third area ribs 263, and the length of the first reinforcing rib 26 of the first area rib 261 is greater than the length of the first reinforcing rib 26 of the second area rib 262, and the length of the first reinforcing rib 26 of the third area rib 263 is greater than the length of the first reinforcing rib 26 of the second area rib 262. That is, Figure 4 As shown, the plurality of first reinforcing ribs 26 can form a "concave" structure, thereby providing an escape space for assembling other structures on the outer panel 2 through the avoidance of the second area ribs 262, while ensuring the strength of the top edge of the outer panel 2.

[0101] Among them, the length of the first reinforcing rib 26 of the first area rib 261 and the length of the first reinforcing rib 26 of the third area rib 263 can be equal or unequal; the lengths of the first reinforcing ribs 26 included in the first area rib 261 can be equal or unequal; the lengths of the first reinforcing ribs 26 included in the second area rib 262 can be equal or unequal; the lengths of the first reinforcing ribs 26 included in the third area rib 263 can be equal or unequal, and the present disclosure does not limit this.

[0102] Among them, the total length of the first area rib 261, the second area rib 262 and the third area rib 263 can be 1200mm-1300mm, and a screw column can be set near the left and right end points of the total area; the length of the first area rib 261 is designed to be 400mm-450mm, the height of the first reinforcing rib 26 of the first area rib 261 is designed to be in the range of 60mm-75mm, and the interval between adjacent first reinforcing ribs 26 is 8mm-12mm; the length of the third area rib 263 is designed to be 400mm-450mm, the height of the first reinforcing rib 26 of the third area rib 263 is designed to be in the range of 60mm-75mm, and the interval between adjacent first reinforcing ribs 26 is 8mm-12mm; the height of the first reinforcing rib 26 of the second area rib 262 is designed to be in the range of 20mm-25mm, and the interval between adjacent first reinforcing ribs 26 is 10mm-15mm.

[0103] A screw column may be provided near the starting point of the first region rib 261, and a screw column may also be provided near the end point. The length of the first region rib 261 is , the height of the first reinforcing rib 26 of the first region rib 261 is 20-25 mm, and the interval between adjacent first reinforcing ribs 26 is 10 mm-15 mm;

[0104] Furthermore, the outer panel 2 also includes a second reinforcing rib 27, which extends in the parallel direction of the first reinforcing rib 26, and the second reinforcing rib 27 is respectively connected to each first reinforcing rib 26, so that the strength of the first reinforcing rib 26 can be improved by the second reinforcing rib 27, thereby further improving the top edge strength of the outer panel 2 and reducing the probability of deformation during the flipping process.

[0105] In some embodiments, the outer panel 2 further includes at least one first reinforcing boss 28, and the first reinforcing boss 28 can be disposed near one or more first reinforcing ribs 26, such as Figure 4 As shown in , the outer panel 2 includes four first reinforcing bosses 28, wherein two first reinforcing bosses 28 are arranged near the first reinforcing ribs 26 of the first region ribs 261, and two first reinforcing bosses 28 are arranged near the first reinforcing ribs 26 of the third region ribs 263, thereby improving the overall strength of the outer panel 2. The first reinforcing bosses 28 may be circular bosses, with a diameter in the range of 8 mm to 10 mm and a height in the range of 1 mm to 2 mm.

[0106] In some embodiments, Figure 7-Figure 9 As shown, the inner plate 1 includes a first polygonal boss 11 and a second polygonal boss 12 that are protruded away from the outer plate 2. The first polygonal boss 11 and the second polygonal boss 12 are arranged side by side on both sides of the inner plate 1; at least one side edge of the first polygonal boss 11 is arranged close to the corresponding side edge of the inner plate 1, and at least one side edge of the second polygonal boss 12 is arranged close to the corresponding side edge of the inner plate 1. Figure 5-Figure 7 As shown, the parallel direction of the first polygonal boss 11 and the second polygonal boss 12 is substantially perpendicular to the height direction of the inner panel 1, and since the parallel direction is a direction in which the inner panel 1 is relatively long, the relative strength is relatively weak. Therefore, the first polygonal boss 11 and the second polygonal boss 12 arranged side by side can strengthen the strength in a direction in which the inner panel 1 is relatively weak, thereby improving the overall strength of the inner panel 1. Moreover, the first polygonal boss 11 and the second polygonal boss 12 are respectively arranged close to the respective edges of the inner panel 1, which is conducive to increasing the support size and improving the strength.

[0107] The first polygonal boss 11 and the second polygonal boss 12 can be bosses of the same shape and size, or of the same shape but different sizes, and can be designed as required. The first polygonal boss 11 and the second polygonal boss 12 can be equilateral polygonal bosses or non-equilateral polygonal bosses, and can be regular polygonal shapes or irregular polygonal shapes.

[0108] In some embodiments, the first polygonal boss 11 is provided with a central recess 13 and a second weight-reducing opening 14 provided in the central recess 13. The second weight-reducing opening 14 may penetrate the bottom of the central recess 13, or may be partially hollowed out for weight reduction. The shape of the second weight-reducing opening 14 may be adaptively designed according to the area of ​​the central recess 13 and the structural strength of the inner panel 1. For example, the second weight-reducing opening 14 may be a runway-type weight-reducing opening, the length of which may be within the range of 150 mm to 200 mm, and the width of which may be within the range of 80 mm to 100 mm. Taking the first polygonal boss 11 as an example, the second polygonal boss 12 may also be designed with a central recess 13 and a second weight-reducing opening 14, and the specific dimensions may be designed as required.

[0109] The arrangement of the middle recess 13 has a certain influence on the width of the second polygonal boss 12. Figure 8 As shown, taking the second polygonal boss 12 as an example, considering that the second polygonal boss 12 may need to be provided with a boss to embed the screw hole, the second polygonal boss 12 is Figure 8 The red triangle marked area is basically a triangular structure, thereby increasing a physical area to set the boss. The two long sides of the area marked by the red triangle are respectively within the range of 500mm-550mm and 450mm-500mm, and the short side is within the range of 80mm-90mm. At the same time, the second polygonal boss 12 also includes a rib area connected to the red triangle marking area. The width of the horizontal rib of the first red mark in the counterclockwise direction can be within the range of 10mm-15mm, and the length can be within the range of 70mm-80mm. The width of the hypotenuse rib of the second red mark can be within the range of 15mm-25mm, and the length can be within the range of 400mm-50mm. The width of the rib of the long hypotenuse of the third red mark can be within the range of 100mm-120mm, and the length can be within the range of 450mmm-550mm. The width of the horizontal rib of the fourth red mark can be within the range of 70mm-80mm, and the length can be adaptively designed based on the aforementioned red triangle marking area, the horizontal side of the first red mark, the hypotenuse of the second red mark and the long hypotenuse of the third red mark.

[0110] Since the front mask needs to have a flipping function, more screw columns need to be designed on the inner panel 1 to meet the flipping requirement. For example, the inner panel 1 may also include at least one second reinforcing boss 15 provided in the middle recess 13, and screw holes may be pre-embedded on the second reinforcing boss 15, so as to achieve the assembly requirement and improve the strength of the inner panel 1 at the same time. For example, the second reinforcing boss 15 may include an L-shaped structural boss 151 and a square structural boss 152, and one or more screw holes may be pre-embedded in the L-shaped structural boss 151. The length of the L-shaped structural boss 151 is within the range of 300mm-350mm, and the width is within the range of 60mm-80mm. Taking the example of two screw holes pre-embedded in the L-shaped structural boss 151, the spacing between the two screw holes on the length square of the L-shaped structural boss 151 is within the range of 200mm-250mm. The square structure boss 152 may also be pre-buried with one or more screw holes, and the side length of the square structure boss 152 may be within the range of 60 mm-70 mm.

[0111] For another example, the inner panel 1 also includes a third reinforcing boss 16 disposed on the surface of the first polygonal boss 11, and screw holes can be pre-buried in the third reinforcing boss 16 to achieve reinforcement while meeting installation requirements. The third reinforcing boss 16 can be a boss of any structural shape, which can be set at a suitable position according to structural requirements. For example, the third reinforcing boss 16 can be set relatively close to the bottom edge of the inner panel 1. For another example, the third reinforcing boss 16 can be similar to an oblique pyramid structure, with an inclined plane length in the range of 100mm-110mm, an inclined plane width in the range of 40mm-50mm; a cone height in the range of 50mm-70mm; and a taper in the range of 50°-60°. A third reinforcing boss 16 can also be set on the surface of the second polygonal boss 12, and the size and structural shape of the third reinforcing boss 16 can be implemented with reference to the third reinforcing boss 16 on the surface of the first polygonal boss 11.

[0112] In some embodiments, the inner panel 1 further includes a third polygonal boss 17 and a fourth polygonal boss 18, which are arranged between the first polygonal boss 11 and the second polygonal boss 12, and the third polygonal boss 17 is located between the first polygonal boss 11 and the fourth polygonal boss 18, that is, they can be arranged in the order of the first polygonal boss 11-the third polygonal boss 17-the fourth polygonal boss 18-the second polygonal boss 12, so that the strong structural strength of the inner panel 1 can be further enhanced by the arrangement of the third polygonal boss 17 and the fourth polygonal boss 18. The structural shape and size of the third polygonal boss 17 and the fourth polygonal boss 18 can be designed according to the spacing between the first polygonal boss 11 and the second polygonal boss 12 and the blank size.

[0113] For example, the third polygonal boss 17 and the fourth polygonal boss 18 may be a conical structure, the length of the conical structure is within the range of 400mm-500mm, the upper width is within the range of 200mm-250mm, and the lower width is within the range of 100mm-150mm. At least one of the third polygonal boss 17 and the fourth polygonal boss 18 may be provided with a third weight-reducing opening, and the shape of the third weight-reducing opening may be designed as required.

[0114] In some embodiments, the inner panel 1 may further include a symmetrical boss 19 disposed between the third polygonal boss 17 and the fourth polygonal boss 18, wherein the third polygonal boss 17 and the fourth polygonal boss 18 are symmetrically disposed about the symmetry axis of the symmetrical boss 19. The symmetrical boss 19 may be located below a position on the inner panel 1 corresponding to the recessed groove 24 of the outer panel 2. The height of the symmetrical boss 19 is less than the height of the third polygonal boss 17, and the height of the symmetrical boss 19 is also less than the height of the third polygonal boss 17.

[0115] In some embodiments, the inner panel 1 also includes a convex rib 101 extending away from the outer panel 2, and the extension direction of the convex rib 101 is basically parallel to the side-by-side direction of the first polygonal boss 11 and the second polygonal boss 12. The convex rib 101 is arranged close to the bottom edge of the inner panel 1, so as to strengthen the bottom edge of the inner panel 1.

[0116] Considering the rigidity of the whole front mask and the convenience of flipping, in the height direction of the front mask, the inner panel 1 includes a protruding portion 102 protruding from the outer panel 2, and the side of the protruding portion 102 away from the outer panel 2 is provided with a plurality of oblique ribs 103 inclined relative to the height direction of the inner panel 1, and the strength of the protruding portion 102 is improved by the plurality of oblique ribs 103. For example, the plurality of oblique ribs 103 can be divided into a first row of oblique ribs and a second row of oblique ribs, the inclination direction of the first row of oblique ribs is opposite to the inclination direction, and the first row of oblique ribs and the second row of oblique ribs are arranged to intersect each other, thereby forming two rows of upper and lower triangular structures, the inner angles of the triangular structures can be 60°, and the Centennial City can be within the range of 45mm-55mm; or in other embodiments, the first row of oblique ribs and the second row of oblique ribs are arranged to intersect each other, so as to form a row of triangular structures, which can be specifically designed as needed.

[0117] In other embodiments, the inner panel 1 also includes a strip rib 104 provided on the protruding portion 102, and the strip rib 104 extends from one side of the protruding portion 102 to the other side; oblique ribs 103 are respectively provided on both sides of the strip rib 104, and the multiple oblique ribs 103 located on any side of the strip rib 104 include a first oblique rib and a second oblique rib with opposite inclination directions, the first oblique rib and the second oblique rib are alternately arranged, and adjacent first oblique ribs and second oblique ribs are connected to the same position of the strip rib 104, so that a triangular structure surrounded by the first oblique rib and the second oblique rib can be formed on both sides of the strip rib 104.

[0118] According to the structural design of the inner panel 1 and the outer panel 2, the following conclusions are obtained through comprehensive analysis of the modal, stiffness, strength stress, etc. of the front mask:

[0119] First, the constrained modes of the front mask structure are analyzed based on Fig.10 The front mask bending mode simulation diagram and Fig.11 The simulation diagram of the torsional mode of the front mask is shown, and the vibration shapes and frequency results of the torsional mode of the front mask and the bending mode of the front mask are obtained, see Table 3:

[0120]

[0121] Table 3

[0122] Through analysis, it was found that the torsional modal frequency value of the front mask assembly was 41.1Hz, and the bending modal frequency value of the front mask was 70.3Hz, both of which met the design requirement of ≥35Hz.

[0123] Then constrain all six degrees of freedom of the hinge mounting point of the front mask, and constrain the three degrees of freedom of movement of the lock mounting point. Fig.12 and Fig.13 In the simulation analysis shown, a load of 980N is applied to the middle area outside the front mask through a rigid disk with a diameter of 80mm. The loading direction is the normal direction of the plane where the rigid disk is located. A contact setting is made between the rigid disk and the outer plate of the front mask, and the following table is obtained:

[0124]

[0125]

[0126] Table 4

[0127] When evaluating the stiffness of the front mask, the design requires a deformation of ≤6mm and a strength of less than 60MPa. The stiffness analysis results show that the maximum deformation of the front mask is 4.66mm, which is less than the design requirement of 6mm. The maximum strength of the front mask is 56.1MPa, which is less than the design requirement of 60MPa, meeting the requirements.

[0128] Then the strength of the front mask assembly is analyzed, as follows: Figure 14-16 As shown, under vertical bending conditions, lateral bending conditions, and emergency braking conditions, the accelerations are loaded in the Z direction at -2.5g, Z direction 1.5g / Y direction 0.4g, Z direction 1.5g / X direction -0.7g, and the parameters of the front mask are as follows:

[0129]

[0130] Table 5

[0131] See Table 5, the maximum strength of the front mask under vertical bending conditions is 1.2Pa, the maximum strength under lateral bending conditions is 1MPa under turning conditions, and the maximum strength under emergency braking conditions is 1MPa; the average value is much less than 0.8 times the tensile strength of the material. Through analysis, it can be concluded that the selection of structural materials and structural optimization meet the design requirements.

[0132] Through optimization of material selection, structural design, etc., as shown in Table 6:

[0133]

[0134]

[0135] When the structure meets the design requirements, the mass of the front mask can achieve a 21.2% weight reduction compared to traditional SMC composite materials; at the same time, the carbon emissions are reduced from the original 5.5 to 2.891, achieving a carbon reduction of more than 47.4%.

[0136] From the above analysis, it can be seen that the composite material of degradable epoxy resin combined with glass fiber in this application is used to replace the traditional SMC composite material. Through material improvement, structural optimization and process manufacturing optimization, it can meet the design and product manufacturing, achieve the goals of weight reduction and performance, and also reduce product carbon emissions. It provides direct technical support for the lightweight and environmental protection of commercial vehicles, and can be widely used in the current commercial vehicle market.

[0137] It can be understood that the above descriptions are only some illustrative embodiments of the front mask of the present application. Without departing from the creative essence of the present application, some structures of the front mask of the present application can be subjected to equivalent or similar changes, which will be included in the protection scope defined by the claims attached to the present application.

[0138] The present application also provides a vehicle, which may include the front cover described in any one of the above embodiments, or include a plate prepared by the method described in any one of the above embodiments.

[0139] The vehicle of the present application can have similar beneficial technical effects as the front cover described above, so it will not be described in detail here.

[0140] The battery management system and electric vehicle provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the battery management system and electric vehicle in the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application and is not intended to limit the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit and principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the scope of protection of the claims attached to the present application.

Claims

1. A method for preparing a plate, characterized in that: include: uniformly mixing a degradable epoxy resin, a reinforcing material, glass microspheres, a filler, an initiator, a cross-linking agent, a thickener, a low shrinkage additive, an internal mold release agent and a diluent to obtain a resin paste; forming a fiberglass mat on a polyester film; After the resin paste is impregnated into the glass fiber mat, a polyester film is laid flat on the surface of the resin paste to form a sheet by pressing; The sheet material is compression molded to obtain the plate material.

2. The preparation method according to claim 1, characterized in that: Also includes: The degradable epoxy resin is prepared by using terephthalaldehyde, L-phenylglycine amide and epoxy resin E51.

3. The preparation method according to claim 1, characterized in that: The resin paste meets at least one of the following conditions: 100-120 parts by weight of degradable epoxy resin; The degradable epoxy resin comprises 100 parts of epoxy resin E51, 30-40 parts of phthalaldehyde and 20-30 parts of L-phenylglycine amide; The filler includes carbon calcium, and the content of the carbon calcium is 50-70 parts by weight; The low shrinkage additive comprises polystyrene PS and polymethacrylic acid PMMA, and the content of the low shrinkage additive is about 30 parts by weight; The initiator comprises one or both of tert-butyl perbenzoate and benzoyl peroxide, and the content of the initiator is 20 parts by weight; The diluent includes 10-20 parts by weight of styrene; The internal mold release agent includes 2-3 parts by weight of zinc stearate; The thickener comprises 3-5 parts by weight of magnesium oxide; The glass microsphere content is 10-15 parts by weight; The content of other additives is 0.2-0.5 parts by weight; The glass fiber mat includes glass fibers, and the glass fibers are about 70-80 parts by weight.

4. The preparation method according to claim 1, characterized in that: The method of performing compression molding based on the sheet material to obtain a plate material comprises: Applying a release agent to the mold cavity of the upper mold and the mold cavity of the lower mold respectively; Preheating the upper mold and the lower mold to respective molding temperatures; Adding the sheet into the mold cavity of the upper mold and the mold cavity of the lower mold; After the upper mold and the lower mold are molded together, a first pressurization is performed according to a first molding pressure; After the pressure is released, pressurizing is performed for the second time according to the second molding pressure; The plate is demoulded to obtain the plate.

5. A front mask, characterized in that: include: Inner panels; An outer panel, a first side of which forms at least a portion of the appearance of the front mask, and an inner panel is connected to a second side of the outer panel facing away from the first side. The inner panel and / or the outer panel are prepared by the preparation method according to any one of claims 1 to 4.

6. The front mask according to claim 5, characterized in that: The outer plate includes a first arc-shaped area, a second arc-shaped area and a third arc-shaped area, the second arc-shaped area is connected to the first arc-shaped area and the third arc-shaped area respectively, and the second arc-shaped area is located between the first arc-shaped area and the third arc-shaped area.

7. The front mask according to claim 5, characterized in that: The outer plate further comprises a plurality of first reinforcing ribs arranged side by side and in parallel, each of the first reinforcing ribs extending from the top edge of the outer plate in the height direction to the other opposite side.

8. The front mask according to claim 7, characterized in that: The plurality of first reinforcing ribs are divided into first area ribs, second area ribs and third area ribs, the second area ribs are located between the first area ribs and the third area ribs, and the length of the first reinforcing rib of the first area rib is greater than the length of the first reinforcing rib of the second area rib, and the length of the first reinforcing rib of the third area rib is greater than the length of the first reinforcing rib of the second area rib.

9. The front mask according to claim 7, characterized in that: The outer plate further includes second reinforcing ribs, the second reinforcing ribs extending along the parallel direction of the first reinforcing ribs, and the second reinforcing ribs are respectively connected to each of the first reinforcing ribs.

10. The front mask according to claim 5, characterized in that: The inner plate comprises a first polygonal boss and a second polygonal boss which are raised away from the outer plate, wherein the first polygonal boss and the second polygonal boss are arranged side by side on both sides of the inner plate; At least one side edge of the first polygonal boss is disposed close to the corresponding side edge of the inner plate, and at least one side edge of the second polygonal boss is disposed close to the corresponding side edge of the inner plate.

11. The front mask according to claim 10, characterized in that: The first polygonal boss and / or the second polygonal boss is provided with a central recess and a second weight-reducing opening provided in the central recess, and the inner panel further comprises at least one second reinforcing boss provided in the central recess area; or, The inner plate further includes a third reinforcing boss provided on the surface of the first polygonal boss and / or the surface of the second polygonal boss; or, The inner plate further includes a third polygonal boss and a fourth polygonal boss disposed between the first polygonal boss and the second polygonal boss, and the third polygonal boss is located between the fourth polygonal boss and the first polygonal boss; or The inner plate further includes a convex rib protruding away from the outer plate, wherein the extending direction of the convex rib is substantially parallel to the parallel direction of the first polygonal boss and the second polygonal boss, and the convex rib is arranged close to the bottom edge of the inner plate.

12. The front mask according to claim 5, characterized in that: In the height direction of the front mask, the inner plate includes a protruding portion protruding from the outer plate, and a side of the protruding portion away from the outer plate is provided with a plurality of oblique ribs inclined relative to the height direction of the inner plate.

13. The front mask according to claim 12, characterized in that: The plurality of oblique ribs are divided into a first row of oblique ribs and a second row of oblique ribs, the oblique direction of the first row of oblique ribs is opposite to the oblique direction of the second row of oblique ribs, and the first row of oblique ribs and the second row of oblique ribs are arranged to intersect each other; Alternatively, the inner panel further includes a strip rib provided on the protruding portion, the strip rib extending from one side of the protruding portion to the other side, the oblique ribs being provided on both sides of the strip rib respectively, and the multiple oblique ribs located on either side of the strip rib include a first oblique rib and a second oblique rib having opposite inclination directions, and the first oblique rib and the second oblique rib are alternately arranged.

14. A vehicle, characterized in that: Comprising a front mask as claimed in any one of claims 5-13.

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