Method for manufacturing a panel, front mask and vehicle

Abstract

The application relates to a preparation method of a plate, a front cover and a vehicle. The preparation method of the plate comprises uniformly mixing degradable epoxy resin, reinforcing material, glass microbeads, fillers, initiators, cross-linking agents, thickening agents, low-shrinkage additives, internal release agents and diluents to obtain a resin paste; forming a glass fiber mat on a polyester film; after the resin paste is impregnated in the glass fiber mat, the polyester film is laid on the surface of the resin paste, and a sheet is pressed and formed; and the sheet is used as the basis for die forming to obtain the plate. The degradable epoxy resin is combined with the introduced glass microbeads, initiators and cross-linking agents, and the like, so that the compatibility between the degradable epoxy resin and various materials can be improved, the product is light in weight compared with a traditional SMC product, the apparent quality of the product is high, defects such as shrinkage and bubbles are few, the tensile strength meets the design requirement, carbon emission can be reduced, and the environment is protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a plate preparation method, a front cover and a vehicle. BACKGROUND

[0002] Based on the excellent mechanical properties of SMC (Sheet molding compound) material and the advantages of automatic production, it is widely developed and applied on commercial vehicles. With the enhancement of environmental protection consciousness in various countries, reducing environmental pollution, the products that cannot be effectively controlled or recycled will be restricted, therefore, developing degradable and recyclable thermosetting resin-based composite materials will be one of the researches. SUMMARY

[0003] The present application provides a plate preparation method, 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, a plate preparation method is provided, comprising:

[0005] uniformly mixing degradable epoxy resin, reinforcing material, glass microbeads, filler, initiator, crosslinking agent, thickening agent, low shrinkage additive, internal release agent and diluent to obtain a resin paste;

[0006] forming a glass fiber mat on a polyester film;

[0007] after impregnating the resin paste in the glass fiber mat, laying a polyester film on the surface of the resin paste and pressing to form a sheet;

[0008] molding the sheet to obtain the plate.

[0009] Optionally, it further comprises:

[0010] The degradable epoxy resin is prepared by using terephthaldehyde, 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 terephthaldehyde and 20-30 parts of L-phenylglycine amide;

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

[0015] The low-shrinkage additive includes polystyrene (PS) and polymethyl methacrylate (PMMA), and the content of the low-shrinkage additive is about 30 parts by weight;

[0016] The initiator includes one or both of t-butyl peroxybenzoate 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 release agent includes 2-3 parts by weight of zinc stearate;

[0019] The thickening agent includes 3-5 parts by weight of magnesium oxide;

[0020] The content of the glass microbeads is 10-15 parts by weight

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

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

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

[0024] The mold cavity of the upper mold and the mold cavity of the lower mold are respectively coated with a release agent;

[0025] The upper mold and the lower mold are respectively preheated to respective molding temperatures;

[0026] The sheet is added to 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 closed, first pressure is applied according to a first molding pressure;

[0028] After pressure relief, second pressure is applied according to a second molding pressure;

[0029] The plate is obtained by demolding.

[0030] According to a second aspect of the embodiments of the present disclosure, a front cover is provided, including:

[0031] An inner plate;

[0032] An outer plate, a first side of the outer plate forming at least part of an appearance surface of the front cover, the inner plate being connected to a second side of the outer plate away from the first side, the inner plate and / or the outer plate being formed by the preparation method of any one of the preceding embodiments.

[0033] Optionally, the outer plate comprises a first arc-shaped area, a second arc-shaped area and a third arc-shaped area, the second arc-shaped area is connected with 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 plate further comprises a plurality of first reinforcing ribs arranged side by side and parallel to each other, each first reinforcing rib extends from the top edge of the outer plate to the opposite side in the height direction.

[0035] Optionally, the plurality of first reinforcing ribs are divided into a first area rib, a second area rib and a third area rib, the second area rib is located between the first area rib and the third area rib, 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 plate further comprises a second reinforcing rib, the second reinforcing rib extends along the side-by-side direction of the first reinforcing rib, and the second reinforcing rib is connected with each first reinforcing rib respectively.

[0037] Optionally, the inner plate comprises a first polygonal boss and a second polygonal boss protruding away from the outer plate, 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 arranged close to the corresponding side edge of the inner plate, and at least one side edge of the second polygonal boss is arranged 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 middle recess and a second weight-reducing opening arranged in the middle recess, and the inner plate further comprises at least one second reinforcing boss arranged in the middle recess area; or,

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

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

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

[0043] Optionally, in the height direction of the front cover, the inner plate comprises a protruding portion arranged protruding from the outer plate, and a plurality of inclined ribs are arranged on the side of the protruding portion away from the outer plate and inclined relative to the height direction of the inner plate.

[0044] Optionally, the plurality of inclined ribs are divided into a first row of inclined ribs and a second row of inclined ribs, the inclined direction of the first row of inclined ribs is opposite to the inclined direction of the second row of inclined ribs, and the first row of inclined ribs and the second row of inclined ribs are arranged alternately.

[0045] Alternatively, the inner plate further comprises a strip-shaped rib arranged on the protruding portion, the strip-shaped rib extends from one side of the protruding portion to the other side, the two sides of the strip-shaped rib are respectively provided with the inclined ribs, and the plurality of inclined ribs on either side of the strip-shaped rib comprises first inclined ribs and second inclined ribs with opposite inclined directions, and the first inclined ribs and the second inclined ribs are arranged alternately.

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

[0047] The technical solutions provided by the embodiments of the present application can include the following beneficial effects:

[0048] The degradable epoxy resin combined with the introduced glass beads, initiators and crosslinking agents can improve the compatibility between the degradable epoxy resin and various materials, compared with traditional SMC products, which is beneficial to the lightweight of the product, and the product has high apparent quality, few defects such as shrinkage and bubbles, and meets the design requirements of tensile strength, and can also reduce carbon emissions and be beneficial to environmental protection.

[0049] From the above embodiments, 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 DRAWINGS

[0050] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0051] Figure 1 is a flow chart of a preparation method of a plate material according to an exemplary embodiment.

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

[0053] Figure 3 is an appearance diagram of a product of another embodiment based on the preparation method of Figure 1 .

[0054] Figure 4 is a structural schematic diagram of a front cover according to an example embodiment.

[0055] Figure 5 is a structural schematic diagram of an outer plate according to an example embodiment.

[0056] Figure 6 is Figure 5 is a partial schematic diagram of the outer plate.

[0057] Figure 7 is a structural schematic diagram of an inner plate according to an example embodiment.

[0058] Figure 8 is Figure 7 is another angle structural schematic diagram of the inner plate.

[0059] Figure 9 is Figure 7 is a partial schematic diagram of the inner plate.

[0060] Figure 10 is a bending modal simulation schematic diagram of the front cover according to an example embodiment.

[0061] Figure 11 is a torsional modal simulation schematic diagram of the front cover according to an example embodiment.

[0062] Figure 12 is a displacement schematic diagram of the front cover stiffness according to an example embodiment.

[0063] Figure 13 is a strength schematic diagram of the front cover stiffness according to an example embodiment.

[0064] Figure 14 is a stress change schematic diagram of the front cover under a vertical bending working condition according to an example embodiment.

[0065] Figure 15 is a stress change schematic diagram of the front cover under a lateral bending working condition according to an example embodiment.

[0066] Figure 16 is a stress change schematic diagram of the front cover under an emergency braking working condition according to an example embodiment.

[0067] BRIEF DESCRIPTION OF DRAWINGS

[0068] 1, inner plate; 11, first polygonal boss; 12, second polygonal boss; 13, middle recess; 14, second lightening hole; 15, second reinforcing boss; 16, third reinforcing boss; 17, third polygonal boss; 18, fourth polygonal boss; 19, symmetrical boss; 101, convex rib; 102, convex part; 103, inclined rib; 104, strip rib; 2, outer plate; 21, first arc-shaped area; 22, second arc-shaped area; 23, third arc-shaped area; 24, recessed groove; 25, first lightening hole; 26, first reinforcing rib; 261, first rib area; 262, second rib area; 263, third rib area. DETAILED DESCRIPTION

[0069] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, same numbers refer to same elements in all figures unless otherwise described. The following exemplary embodiments described in the examples do not represent all the embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with some aspects of the present application as detailed in the appended claims.

[0070] The front cover of the present application and the method for manufacturing the same will be described in detail below with reference to the accompanying drawings. The features in the following examples and embodiments can be combined with each other without conflict.

[0071] Figure 1 A flow chart of a method for manufacturing a plate according to an exemplary embodiment is shown in FIG. 1. As shown in FIG. 1, the method for manufacturing the plate can include the following steps: Figure 1

[0072] In step 101, a resin paste is obtained by uniformly mixing a degradable epoxy resin, a reinforcing material, glass beads, a filler, an initiator, a crosslinking agent, a thickening agent, a low shrinkage additive, an internal release agent, and a diluent.

[0073] In this example, the degradable epoxy resin can include terephthaldehyde, L-phenylglycine amide, and epoxy resin E51. For example, the degradable epoxy resin can be synthesized in advance using terephthaldehyde, L-phenylglycine amide, and epoxy resin E51 as main components. For example, the content of the degradable epoxy resin in the formulation of the resin paste can be between 100 parts and 200 parts by weight. The degradable epoxy resin can include 100 parts of epoxy resin E51, 30-40 parts of terephthaldehyde, and 20-30 parts of L-phenylglycine amide, and of course, in addition to terephthaldehyde, L-phenylglycine amide, and epoxy resin E51, the degradable epoxy resin can also include some small amounts of other components.

[0074] ​The filler includes calcium carbide, and the content of the calcium carbide is 50-70 parts by weight; the low shrinkage additive is polystyrene PS and polymethyl methacrylate PMMA, the mixed solution obtained after mixing the polystyrene PS and the polymethyl methacrylate PMMA is used as the low shrinkage additive, and the content of the low shrinkage additive is about 30 parts by weight; the initiator includes one or both of t-butyl peroxy benzoate and benzoyl peroxide, and the content of the initiator is about 20 parts by weight; the diluent includes 10-20 parts by weight of styrene; the release agent includes 2-3 parts by weight of zinc stearate; the thickening agent includes 3-5 parts by weight of magnesium oxide; the glass fiber felt includes glass fiber, and the content of the glass fiber is 70-80 parts by weight; the content of the glass microbeads is 10-15 parts by weight, and the content of other additives is 0.2-0.5 parts by weight.

[0075] In the mixing process, the raw materials can be weighed according to the above content first, then a certain proportion of the formula weight parts of the degradable epoxy resin is added to the barrel, then the formula weight parts of the low shrinkage agent is added to the barrel and stirred for 5-10 min; then the formula weight parts of the initiator is added and stirred for 3-5 min; then the formula weight parts of the internal release agent is added and stirred for 4-7 min; then the proportion weight parts of the filler is added and stirred for 15-20 min; then the formula weight parts of the diluent and other additives is added and stirred for 3-5 min; then the proportion weight parts of the thickening agent is added and stirred for 5-7 min to form the resin paste. The above stirring operations can be carried out by a stirrer at a certain stirring frequency, and the stirring frequencies of the respective steps can be the same or different.

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

[0077] In step 103, after the resin paste is impregnated in the glass fiber felt, a polyester film is laid on the surface of the resin paste, and a sheet material is formed by pressing.

[0078] In this embodiment, a polyester film can be laid first, and then dry glass fiber is laid on the polyester film to obtain a glass fiber felt formed on the polyester film. Then the resin paste is uniformly coated on the glass fiber felt by using a doctor blade, so that the resin paste is impregnated in the glass fiber felt, and the coating of the resin paste can be multiple layers, for example, about 15-18 layers, and then a polyester film is laid on the surface of the coated resin paste and pressed to form a sheet material.

[0079] In step 104, a mold pressing is performed based on the sheet material to obtain the plate material.

[0080] In this embodiment, the molded sheet can be based on the molding, and the plate with the target shape is obtained. For example, for the front cover of the vehicle, the preparation method has a great influence on the performance of the product, and reasonable process conditions and equipment process parameters need to be used to obtain high-quality product effects.

[0081] Therefore, in the process of preparing the front cover, the mold cavity of the upper mold and the mold cavity of the lower mold can be coated with a release agent respectively, and the release agent is uniformly coated on the surface of the mold cavity of the upper mold and the lower mold. Then the upper mold and the lower mold coated with the release agent are preheated to the respective molding temperature, for example, the molding temperature of the upper mold is set to 140-145°C, and the molding temperature of the lower mold is set to 135-140°C. Then, 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 area of the mold cavity. Then, after the upper mold and the lower mold are closed, the sheet solid becomes a container, and then the first pressure is applied for the first time. With the progress of cross-linking reaction, the curing time is continuously optimized to increase the molecular weight of the resin, and the curing degree is improved, and finally a solid state is formed. After the first pressure is applied, the second pressure can be applied after pressure relief, and the solid state becomes a melt again. After the second pressure is applied, the plate can be demolded.

[0082] The first molding pressure is in the range of 15-25 MPa, and the second molding pressure is in the range of 10-20 MPa; and / or the sum of the time of the first pressure and the second pressure is in the range of 180-200 s. The mold can be cooled to 50-70°C inside and outside before demolding. By means of twice pressure, the plate can be molded to improve the quality of the product. The mold cavity of the upper mold and the lower mold can be designed respectively for the structure required to be molded on the front cover.

[0083] According to the above preparation method, five kinds of plate materials are prepared by adjusting the process parameters and components of the primary product, and the plate material prepared by traditional SMC composite material is used as a 1th negative control. The specific process preparation parameters are shown in Table 1:

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

[0085] Table 1

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

[0087]

[0088] Table 2

[0089] Example 2 only changes the material formula, other process parameters are not changed, it is found that after the part is prepared, the surface quality of the plate material of Example 2 appears a large number of bubbles and gel defects, and the strength of the plate product obtained is also greatly reduced, so the process parameters suitable for traditional SMC are not suitable for the degradable epoxy resin-based glass fiber composite material.

[0090] Example 3 is based on the reduction of the upper mold forming temperature and the lower mold forming temperature of Comparative Example 1. When the forming temperature of the upper mold and the lower mold is reduced, the surface gloss of the plate product of Example 3 is obviously increased, which shows that the higher the temperature of the degradable epoxy resin-based glass fiber composite material under the condition of complete curing, the larger the gap formed between the epoxy resin and the low shrinkage agent after curing and cooling, and the more obvious the anti-shrinkage effect. However, too high forming temperature not only makes the shrinkage rate of the plate product small, but also easily causes the product surface to produce mottling, bubbles and lose gloss. However, if the upper mold forming temperature and the lower mold forming temperature are too low, the material cross-linking and curing is not complete, the strength is affected, and the surface of the part will also produce defects. 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 is based on the increase of the second pressure operation on the basis of Comparative Example 1. Through the adjustment of multiple pressures, it is found that the apparent quality of the plate product of Example 4 is obviously improved. The effect of increasing the forming pressure is to overcome the vapor pressure generated by the volatile matter produced by the temperature rise of the mold pressing material, to avoid the defects such as bubbles, delamination and loose structure of the product, to make the mold closed so that the product has fixed size, shape and minimum flash, and to prevent the product from deforming due to shrinkage.

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

[0093] Example 6 is based on the reduction of the upper mold forming temperature and the lower mold forming temperature of Example 5. The main reason is that appropriately reducing the forming temperature can not only reduce the shrinkage rate of the product and improve the apparent quality of the product, but also reduce energy waste and improve the service life of the mold. See Figure 2 The product appearance picture of Example 2 is Figure 3 The product appearance picture of Example 6 is Figure 2 And Figure 3 It can be seen that through the change of process parameters, the appearance of the product is greatly improved.

[0094] It can be seen from the performance results and product appearance of the embodiments that, in the actual molding production process, the key factors for improving the quality of the starting material include the effects of the upper mold forming temperature, the lower mold forming temperature, the segmented forming pressure, and the forming time on bubbles and gels when preparing a plate made of a degradable epoxy resin-based composite material combined with glass fibers. Of course, the forming time mainly affects the production rhythm of the product, so in order to improve the molding efficiency and reduce the molding rhythm, it is also very important to reasonably control and optimize the forming time, thereby improving the molding production efficiency and shortening the forming time. Moreover, by introducing glass beads, initiators, and crosslinking agents into the degradable epoxy resin, the compatibility between the degradable epoxy resin and various materials can be improved, and the product can be lightweighted. Compared with traditional SMC products, the weight can be reduced by more than 18%, and the product has high appearance quality, no shrinkage, no bubbles, and other defects, and the tensile strength is ≥75 MPa. Moreover, by using degradable epoxy resin, carbon emissions can be reduced by more than 40%.

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

[0096] In some embodiments, considering the fit between the front mask and the vehicle body, as shown in Figure 5 , the outer plate 2 can include a first arc-shaped area 21, a second arc-shaped area 22, and a third arc-shaped area 23. The second arc-shaped area 22 is connected to the first arc-shaped area 21 and the third arc-shaped area 23, respectively, and is located between the first arc-shaped area 21 and the third arc-shaped area 23. The height of the first arc-shaped area 21 is substantially the height of the outer plate 2, which can be understood as the length of the first arc-shaped area 21 and the outer plate 2 in the height direction of the vehicle. Similarly, the height of the second arc-shaped area 22 and the height of the third arc-shaped area 23 are both substantially equal to the height of the first arc-shaped area 21, and as shown in Figure 3 , 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 arc of the first arc-shaped area 21 and the third arc-shaped area 23 are equal, which can also be understood as the central angle of the arc segment of the first arc-shaped area 21 and the central angle of the arc segment of the third arc-shaped area 23 can be equal or not equal. For example, the central angle of the second arc-shaped area 22 can be within the range of 130°-150°, and the central angle of the first arc-shaped area 21 and the third arc-shaped area 23 can be within the range of 100°-120°, that is, the first arc-shaped area 21 and the third arc-shaped area 23 can be more "steep" than the second arc-shaped area 22.

[0098] In order to install the car logo, the outer plate 2 is provided with a recessed groove 24 recessed inward from the side away from the inner plate 1, and the recessed depth of the recessed groove 24 can be about 25mm-40mm, and in order to assemble the car logo, a plurality of mounting holes are arranged in the recess. At the same time, in order to reduce the weight of the front cover, the outer plate 2 further comprises a first weight-reducing port 25 penetrating through the bottom of the recessed groove 24. The shape of the first weight-reducing port 25 can be adaptively designed according to the shape of the recessed groove 24 and the installation requirements of the car logo, such as Figure 3 As shown in FIG. 13, the first weight-reducing port 25 can be similar to a conical structure, of course, in other embodiments, the first weight-reducing port 25 can 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 plate 2 and the inner plate 1, the recessed groove 24 can be generally arranged close to the top edge of the outer plate 2, that is, the outer plate 2 is arranged closer to the edge of the roof, and a plurality of screw columns can also be arranged at the top edge position of the outer plate 2, such as ten screw columns, which are connected and fixed by the inner plate 1 and the outer plate 2 through the screw column. Moreover, since the front cover needs to have the function of rotating relative to the vehicle body during vehicle manufacturing, and the rotating shaft is usually designed to be flipped based on the top of the front cover closer to the roof. Therefore, based on this functional design requirement, higher strength requirements are put forward for the top edge of the outer plate 2, and the arrangement of multiple screw columns can be considered to some extent as adding a reinforcing structure to the top edge position of the outer plate 2, thereby improving the strength of the top edge of the outer plate 2.

[0100] Of course, in order to further improve the strength of the top edge of the outer plate 2, as Figure 6As shown, the outer plate 2 further comprises a plurality of first reinforcing ribs 26 arranged in parallel side by side, each of the first reinforcing ribs 26 extending from the top edge of the outer plate 2 in the height direction to the opposite side, so as to improve the strength of the top edge of the outer plate 2, so as to ensure the strength requirement of the front cover. The plurality of first reinforcing ribs 26 can be divided into a first area rib 261, a second area rib 262 and a third area rib 263, the second area rib 262 being located between the first area rib 261 and the third area rib 263, and the length of the first reinforcing rib 26 of the first area rib 261 being 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 being greater than the length of the first reinforcing rib 26 of the second area rib 262. That is, as shown in the figure Figure 4 As shown, the plurality of first reinforcing ribs 26 can form a "concave" structure, so as to provide a space for the assembly of other structures on the outer plate 2 by avoiding the second area rib 262, while ensuring the strength of the top edge of the outer plate 2.

[0101] 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, and the lengths of the first reinforcing ribs 26 included in the third area rib 263 can be equal or unequal, which are not limited by the present disclosure.

[0102] 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 arranged near the left and right ends 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 within the range of 60mm-75mm, and the adjacent first reinforcing ribs 26 are spaced apart by 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 within the range of 60mm-75mm, and the adjacent first reinforcing ribs 26 are spaced apart by 8mm-12mm; the height of the first reinforcing rib 26 of the second area rib 262 is designed to be within the range of 20mm-25mm, and the adjacent first reinforcing ribs 26 are spaced apart by 10mm-15mm.

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

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

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

[0106] In some embodiments, such as Figures 7-9 As shown, the inner plate 1 includes a first polygonal boss 11 and a second polygonal boss 12 protruding 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 edge of the first polygonal boss 11 is located close to the corresponding side of the inner plate 1, and at least one edge of the second polygonal boss 12 is located close to the corresponding side of the inner plate 1. For example... Figures 5-7 As shown, the parallel direction of the first polygonal boss 11 and the second polygonal boss 12 is basically perpendicular to the height direction of the inner plate 1. Since this parallel direction is the direction in which the inner plate 1 is relatively long, its relative strength is also relatively weak. Therefore, by arranging the first polygonal boss 11 and the second polygonal boss 12 side-by-side, the strength of the inner plate 1 in its weaker direction can be strengthened, thereby improving the overall strength of the inner plate 1. Furthermore, the first polygonal boss 11 and the second polygonal boss 12 are respectively located close to their respective edges of the inner plate 1, which helps to increase the support dimensions and improve strength.

[0107] The first polygonal boss 11 and the second polygonal boss 12 can be bosses of the same shape and size, or can be bosses of the same shape but different sizes, and can be designed as needed. 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 middle recess 13 and a second weight-reducing opening 14 arranged in the middle recess 13. The second weight-reducing opening 14 can penetrate the bottom of the middle recess 13, or can be partially hollowed out for weight reduction. The shape of the second weight-reducing opening 14 can be adaptively designed according to the area of the middle recess 13 and the structural strength of the inner plate 1. For example, the second weight-reducing opening 14 can be a runway-type weight-reducing opening, with a length in the range of 150-200 mm and a width in the range of 80-100 mm. In this case, the first polygonal boss 11 is taken as an example, and the second polygonal boss 12 can also be designed with a middle recess 13 and a second weight-reducing opening 14, and the specific dimensions can be designed as needed.

[0109] Based on the arrangement of the middle recess 13, the width of the second polygonal boss 12 is affected to a certain extent. For example 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 pre-bury a screw hole, the second polygonal boss 12 in the red triangular identification area in Figure 8 is basically in a triangular structure, thereby increasing a solid area to set a boss. The two long sides of the red triangular identification area have lengths in the range of 500-550 mm and 450-500 mm, respectively, and the short side has a length in the range of 80-90 mm. Meanwhile, the second polygonal boss 12 also includes a rib area connected to the red triangular identification area. The width of the first red identification horizontal rib in the counterclockwise direction can be in the range of 10-15 mm, and the length can be in the range of 70-80 mm. The width of the second red identification diagonal rib can be in the range of 15-25 mm, and the length can be in the range of 400-50 mm. The width of the third red identification long diagonal rib can be in the range of 100-120 mm, and the length can be in the range of 450-550 mm. The width of the fourth red identification horizontal rib can be in the range of 70-80 mm, and the length can be adaptively designed based on the red triangular identification area, the first red identification horizontal rib, the second red identification diagonal rib, and the third red identification long diagonal rib.

[0110] Based on the fact that the front cover needs to have a turnover function, a plurality of screw posts need to be designed on the inner plate 1 to meet the turnover requirement. For example, the inner plate 1 can further include at least one second reinforcing boss 15 arranged on the middle recess 13, and a screw hole can be pre-buried in the second reinforcing boss 15 to achieve assembly requirements while improving the strength of the inner plate 1. For example, the second reinforcing boss 15 can include an L-shaped structure boss 151 and a square structure boss 152. One or more screw holes can be pre-buried in the L-shaped structure boss 151. The length of the L-shaped structure boss 151 is within the range of 300-350 mm, and the width is within the range of 60-80 mm. Taking the example of pre-buried two screw holes in the L-shaped structure boss 151, the distance between the two screw holes on the length side of the L-shaped structure boss 151 is within the range of 200-250 mm. One or more screw holes can also be pre-buried in the square structure boss 152. The side length of the square structure boss 152 can be within the range of 60-70 mm.

[0111] For another example, the inner plate 1 further includes a third reinforcing boss 16 arranged on the surface of the first polygonal boss 11. A screw hole 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 structure shape, which can be arranged at a suitable position according to structural requirements. For example, the third reinforcing boss 16 can be arranged relatively close to the bottom edge position of the inner plate 1. For another example, the third reinforcing boss 16 can be similar to an oblique pyramid structure, with an oblique surface length within the range of 100-110 mm, an oblique surface width within the range of 40-50 mm, a taper height within the range of 50-70 mm, and a taper within the range of 50°-60°. The third reinforcing boss 16 can also be arranged on the surface of the second polygonal boss 12. The size and structure shape of the third reinforcing boss 16 can refer to the implementation of the third reinforcing boss 16 on the surface of the first polygonal boss 11.

[0112] In some embodiments, the inner plate 1 further includes a third polygonal boss 17 and a fourth polygonal boss 18. The third polygonal boss 17 and the fourth polygonal boss 18 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, the order can be first polygonal boss 11-third polygonal boss 17-fourth polygonal boss 18-second polygonal boss 12. In this way, by arranging the third polygonal boss 17 and the fourth polygonal boss 18, the structural strength of the inner plate 1 can be further enhanced. The structure shape and size of the third polygonal boss 17 and the fourth polygonal boss 18 can be designed according to the spacing and blank size between the first polygonal boss 11 and the second polygonal boss 12.

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

[0114] In some embodiments, the inner plate 1 can further include a symmetrical boss 19 disposed between the third polygonal boss 17 and the fourth polygonal boss 18, the third polygonal boss 17 and the fourth polygonal boss 18 being symmetrically disposed about the symmetry axis of the symmetrical boss 19. The symmetrical boss 19 can be located below the position on the inner plate 1 corresponding to the recessed groove 24 of the outer plate 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 plate 1 further includes a rib 101 protruding away from the outer plate 2, the extension direction of the rib 101 being substantially parallel to the side-by-side direction of the first polygonal boss 11 and the second polygonal boss 12, and the rib 101 being disposed close to the bottom edge of the inner plate 1, so as to strengthen the bottom edge of the inner plate 1.

[0116] Due to the rigidity of the overall front cover and the convenience of turning over, in the height direction of the front cover, the inner plate 1 includes a protruding portion 102 protruding from the outer plate 2, and a plurality of inclined ribs 103 inclined with respect to the height direction of the inner plate 1 are provided on the side of the protruding portion 102 away from the outer plate 2, so as to improve the strength of the protruding portion 102. For example, the plurality of inclined ribs 103 can be divided into a first row of inclined ribs and a second row of inclined ribs, the inclination direction of the first row of inclined ribs being opposite to the inclination direction of the second row of inclined ribs, and the first row of inclined ribs and the second row of inclined ribs are disposed in pairs to form two rows of triangular structures, the internal angles of the triangular structures can be 60°, and the internal angles can be in the range of 45-55 mm. In other embodiments, by disposing the first row of inclined ribs and the second row of inclined ribs in pairs, a row of triangular structures can be formed, which can be designed as needed.

[0117] In some other embodiments, the inner plate 1 further includes a strip rib 104 provided on the protrusion 102, the strip rib 104 extending from one side of the protrusion 102 to the other side; the two sides of the strip rib 104 are respectively provided with diagonal ribs 103, and the multiple diagonal ribs 103 located on either side of the strip rib 104 include a first diagonal rib and a second diagonal rib with opposite inclination directions, the first diagonal rib and the second diagonal rib are alternately arranged, and adjacent first diagonal ribs and second diagonal ribs are connected at the same position of the strip rib 104, so that a triangular structure enclosed by the first diagonal rib and the second diagonal rib can be formed on both sides of the strip rib 104.

[0118] Based on the structural design of the inner panel 1 and outer panel 2, and through comprehensive analysis of the modal, stiffness, strength, and stress of the front cover, the following conclusions are drawn:

[0119] First, the constraint modes of the front hood structure are analyzed, based on... Figure 10 The simulation diagram of the front hood bending mode shown and Figure 11 The simulation diagram of the front hood torsional mode is shown in Table 3. The mode shapes and frequencies of the front hood torsional mode and the front hood bending mode are obtained.

[0120]

[0121] Table 3

[0122] Analysis revealed that the torsional modal frequency of the front hood assembly was 41.1 Hz, and the bending modal frequency of the front hood was 70.3 Hz, both meeting the design requirement of ≥35 Hz.

[0123] Next, constrain all six degrees of freedom of the hinge mounting points on the front cover, and simultaneously constrain the three degrees of freedom of movement of the latch mounting points, through... Figure 12 and Figure 13 The simulation analysis shown illustrates the application of a 980N load to the central region of the front cover using an 80mm diameter rigid disk. The loading direction is the normal to the plane containing the rigid disk, and the rigid disk is set to contact the outer panel of the front cover. The results are shown in the table below:

[0124]

[0125]

[0126] Table 4

[0127] The stiffness of the front cover was evaluated. The design requirements were that the deformation amount should be ≤6mm and the strength should be less than 60MPa. The stiffness analysis results showed that the maximum deformation amount of the front cover was 4.66mm, which was less than the design requirement of 6mm. The maximum strength of the front cover was 56.1MPa, which was less than the design requirement of 60MPa, thus meeting the requirements.

[0128] Then the strength of the front mask assembly is analyzed, respectively as shown in Figures 14-16

[0129]

[0130] Table 5

[0131] Referring to Table 5, the maximum strength of the front mask under the vertical bending condition is 1.2 Pa, the maximum strength under the lateral bending condition is 1 MPa, and the maximum strength under the emergency braking condition is 1 MPa; the average is much smaller 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, structure design and the like, as shown in Table 6:

[0133]

[0134]

[0135] Under the condition that the structure meets the design requirements, the mass of the front mask can be reduced by 21.2% compared with the traditional SMC composite material; at the same time, the carbon emission is reduced from the original 5.5 to 2.891, realizing a reduction of more than 47.4%.

[0136] From the above analysis, it can be seen that by using the degradable epoxy resin combined with glass fiber composite material in the present application to replace the traditional SMC composite material, through material improvement, structure optimization and process manufacturing optimization, the design and product manufacturing can be met, the weight reduction and performance targets are achieved, and the product carbon emission reduction can also be achieved. It provides direct technical support for commercial vehicle lightweighting and environmental protection, and can be widely applied to the current commercial vehicle market.

[0137] It can be understood that the above only describes some illustrative embodiments of the front mask of the present application, and without departing from the essence of the present application, some structures of the front mask of the present application can be transformed equivalently or similarly, which will be covered in the protection scope defined by the claims attached to the present application.

[0138] The present application also provides a vehicle. The vehicle can include the front mask described in any one of the preceding embodiments, or include a plate prepared by the method described in any one of the preceding embodiments.

[0139] The vehicle of the present application can have similar beneficial technical effects as the front mask described above, and therefore will not be described here.​

[0140] The battery management system and the electric vehicle provided by the embodiments of the present application are described in detail above. The battery management system and the electric vehicle of the embodiments of the present application are described by applying specific examples in this paper, and the above embodiment description is only used to help understand the core idea of the present application and does not limit the present application. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the spirit and principles of the present application, and these improvements and modifications should also fall within the protection scope of the appended claims of the present application.

Claims

1. A method of producing a board, characterized in that, The method comprises the following steps: Mixing the degradable epoxy resin, reinforcing material, glass microbeads, filler, initiator, crosslinking agent, thickening agent, low shrinkage additive, internal release agent and diluent to obtain a resin paste; Forming a glass fiber mat on a polyester film; Impregnating the resin paste into the glass fiber mat, and then laying a polyester film on the surface of the resin paste to press a sheet; Molding the sheet to obtain the plate; The method further comprises the following steps: The degradable epoxy resin is prepared by using terephthaldehyde, L-phenylglycine amide and epoxy resin E51.

2. The production method according to claim 1, characterized by, The resin paste satisfies at least one of the following conditions: The degradable epoxy resin is 100-120 parts by weight; The degradable epoxy resin comprises 100 parts of epoxy resin E51, 30-40 parts of terephthaldehyde and 20-30 parts of L-phenylglycine amide; The filler comprises carbon calcium, and the content of the carbon calcium is 50-70 parts by weight; The low shrinkage additive comprises polystyrene PS and polymethyl methacrylate PMMA, and the content of the low shrinkage additive is about 30 parts by weight; The initiator comprises one or both of t-butyl peroxy benzoate and benzoyl peroxide, and the content of the initiator is 20 parts by weight; The diluent comprises 10-20 parts by weight of styrene; The internal release agent comprises 2-3 parts by weight of zinc stearate; The thickening agent comprises 3-5 parts by weight of magnesium oxide; The content of the glass microbeads is 10-15 parts by weight; The content of other auxiliary agents is 0.2-0.5 parts by weight; The glass fiber mat comprises glass fibers, and the content of the glass fibers is about 70-80 parts by weight.

3. The preparation method according to claim 1, characterized in that, The molding of the sheet to obtain the plate comprises the following steps: Coating a release agent on the cavities of the upper mold and the lower mold respectively; Preheating the upper mold and the lower mold to respective molding temperatures respectively; Adding the sheet into the cavities of the upper mold and the lower mold respectively; After the upper mold and the lower mold are closed, first pressurization is performed according to a first molding pressure; After pressure relief, second pressurization is performed according to a second molding pressure; The plate is obtained after demolding.

4. A front cover characterized by, The plate comprises: An inner plate; An outer plate, a first side of the outer plate forms at least part of an appearance surface of the front cover, the inner plate is connected to a second side of the outer plate away from the first side, and the inner plate and / or the outer plate are prepared by the preparation method in any one of claims 1-3.

5. The headgear of claim 4, wherein, The outer plate comprises 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.

6. The face mask of claim 4, wherein, The outer plate further comprises a plurality of first reinforcing ribs arranged side by side and parallel to each other, and each first reinforcing rib extends from a top edge of the outer plate in a height direction to the other side.

7. The headgear of claim 6, wherein, The plurality of first reinforcing ribs are divided into first area rib strips, second area rib strips and third area rib strips, the second area rib strips are located between the first area rib strips and the third area rib strips, the length of the first reinforcing ribs of the first area rib strips is greater than the length of the first reinforcing ribs of the second area rib strips, and the length of the first reinforcing ribs of the third area rib strips is greater than the length of the first reinforcing ribs of the second area rib strips.

8. The face mask of claim 6, wherein, The outer plate further comprises second reinforcing ribs, the second reinforcing ribs extend along the side-by-side direction of the first reinforcing ribs, and each of the second reinforcing ribs is connected with each of the first reinforcing ribs.

9. The headgear of claim 4, wherein, The inner plate comprises first and second polygonal bosses protruding away from the outer plate, and the first and second polygonal bosses are arranged side by side on both sides of the inner plate. At least one side edge of the first polygonal boss is arranged close to the corresponding side edge of the inner plate, and at least one side edge of the second polygonal boss is arranged close to the corresponding side edge of the inner plate.

10. The headgear of claim 9, wherein, The first and / or second polygonal boss is provided with a middle recess and a second weight-reducing opening arranged in the middle recess, and the inner plate further comprises at least one second reinforcing boss arranged in the middle recess area; or The inner plate further comprises a third reinforcing boss arranged on the surface of the first polygonal boss and / or the surface of the second polygonal boss; or The inner plate further comprises third and fourth polygonal bosses arranged between the first and second polygonal bosses, and the third polygonal boss is located between the fourth polygonal boss and the first polygonal boss; or The inner plate further comprises a protruding rib protruding away from the outer plate, the extending direction of the protruding rib is substantially parallel to the side-by-side direction of the first and second polygonal bosses, and the protruding rib is arranged close to the bottom edge of the inner plate.

11. The headgear of claim 4, wherein, In the height direction of the front cover, the inner plate comprises a protruding portion protruding from the outer plate, and the side of the protruding portion away from the outer plate is provided with a plurality of inclined ribs inclined relative to the height direction of the inner plate.

12. The face mask of claim 11, wherein, The plurality of inclined ribs are divided into first and second rows of inclined ribs, the inclination direction of the first row of inclined ribs is opposite to the inclination direction of the second row of inclined ribs, and the first and second rows of inclined ribs are arranged alternately. Alternatively, the inner plate further comprises a strip-shaped rib arranged in the protruding portion, the strip-shaped rib extends from one side of the protruding portion to the other side, the two sides of the strip-shaped rib are respectively provided with the inclined ribs, and the plurality of inclined ribs on either side of the strip-shaped rib comprise first and second inclined ribs with opposite inclination directions, and the first and second inclined ribs are arranged alternately.

13. A vehicle characterized by comprising: The front cover comprises the front cover according to any one of claims 4-12.

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