Forming method of composite helmet shell and forming mold thereof

Abstract

The invention belongs to the technical field of composite helmet shell production, and particularly relates to a forming method and a forming mold of a composite helmet shell. The forming method of the composite helmet shell comprises the following steps that S1, material selection is conducted, specifically, needed materials are selected according to the requirements of the helmet shell; s2, cutting: cutting a material sheet according to the expanded drawing of the helmet shell; s3, paving and pasting: paving and pasting the cut material sheets in a helmet shell forming cavity of a mold to form a plurality of paving layers, sealing the mold through a vacuum auxiliary material, vacuumizing, and compacting the paving layers; s4, curing is conducted, specifically, after all the laying layers are laid, the steps are treated, then the mold is sealed through vacuum auxiliary materials and then vacuumized, and the mold is put into curing equipment to be cured; and S5, taking out, wherein the mold is taken out of the curing equipment and placed on a workbench, and the formed helmet shell is taken out after the vacuum auxiliary materials are removed. The prepared composite helmet shell can meet the requirements for shape, specification, light weight and functionality.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material helmet shell production, and in particular relates to a molding method of a composite material helmet shell and a molding mold thereof. Background Art

[0002] With the development of the composite materials industry and the increasing demand for lightweight products, more and more parts in fire rescue, police protective helmets and civilian helmets are required to be replaced by composite materials. The helmet should be able to protect the head, face, neck and other parts from injury and needs to have good impact strength performance.

[0003] The existing helmet shells are required to meet the functions while ensuring the accuracy of the outer surface dimensions, which brings difficulties to the selection of raw materials for the helmet shells, the selection of molding processes, and the design of molds.

[0004] There is currently a lack of mature molding methods for composite helmet shells in China. Therefore, a molding method for composite helmet shells and a molding die thereof are provided. Summary of the invention

[0005] The purpose of the present invention is to provide a molding method of a composite material helmet shell and a molding die thereof to solve the above-mentioned problem.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The molding method of the composite material helmet shell comprises the following steps:

[0008] S1. Material selection: Select the required materials according to the requirements of the helmet shell;

[0009] S2, cutting: cutting the material pieces according to the unfolded view of the helmet shell;

[0010] S3, paving: paving the cut pieces in the helmet shell forming cavity of the mold to form multiple layers, sealing the mold with vacuum auxiliary materials and then evacuating the vacuum to compact the layers;

[0011] S4, curing: After all the layers are laid, the steps are processed, and then the mold is sealed with vacuum auxiliary materials and vacuumed, and then placed in the curing equipment for curing;

[0012] S5. Take out: Take out the mold from the curing equipment and place it on the workbench, remove the vacuum auxiliary material and then take out the molded helmet shell.

[0013] Preferably, in S1, the materials include aramid fabric prepreg, carbon fiber prepreg and glass fiber, and the aramid fabric prepreg, carbon fiber prepreg and glass fiber are mixed for use, wherein the aramid fabric prepreg accounts for 50%-80%, the carbon fiber prepreg accounts for 10%-30%, and the glass fiber accounts for 10%-20%.

[0014] Preferably, in S3, after the first layer of the laminate is laid, the mold is sealed with a vacuum auxiliary material and then vacuumed to compact the first layer of the laminate;

[0015] Remove the vacuum auxiliary material and proceed to lay other layers. After every 2-3 layers, seal the mold with the vacuum auxiliary material and then evacuate and perform a compaction operation.

[0016] Preferably, in S3, during the laying process of the ply, the ply covers the margin line;

[0017] The laying temperature of the pavement is 18℃-26℃, and the relative humidity is ≤65%.

[0018] A composite material helmet shell molding die for implementing the composite material helmet shell molding method comprises: a first mold block and a second mold block, a positioning assembly is arranged between the first mold block and the second mold block, a connecting structure is arranged between the first mold block and the second mold block, a first mold cavity is opened on the first mold block, a second mold cavity is opened on the second mold block, and the first mold cavity and the second mold cavity are matched to form a helmet shell molding cavity.

[0019] Preferably, the positioning assembly includes at least two first mounting grooves, and the plurality of first mounting grooves are all provided on the side wall where the first mold block and the second mold block are in contact, and there is an angle between the plurality of first mounting grooves, and a first positioning block is fixedly installed in the first mounting groove by a first short bolt, and a positioning groove is provided on one side of the first positioning block facing the opening of the first mounting groove;

[0020] At least two second mounting grooves, multiple second mounting grooves are all opened on the side wall where the second mold block and the first mold block are in contact, there is an angle between the multiple second mounting grooves, the multiple second mounting grooves are arranged one-to-one with the multiple first mounting grooves, a second positioning block is fixedly installed in the second mounting groove by a second short bolt, and the second positioning block is provided with a protrusion that is adapted to and corresponding to the positioning groove.

[0021] Preferably, the connection structure comprises a plurality of stepped through holes, the plurality of stepped through holes are all opened on the first mold block, the plurality of stepped through holes are arranged in parallel, and long bolts are passed through the stepped through holes;

[0022] A plurality of first threaded holes are all formed on the side wall of the second mold block, and the plurality of first threaded holes are arranged in one-to-one correspondence with the plurality of step through holes, and one end of the long bolt is threadedly connected in the first threaded hole.

[0023] Preferably, two first lifting rings are threadedly connected to the first mold block, and two second lifting rings are threadedly connected to the second mold block.

[0024] Preferably, grooves are formed on the side walls of the first mold block and the second mold block opposite to each other.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects:

[0026] The composite helmet shell prepared by the present invention can meet the requirements of shape and specification, and has a flat and smooth outer surface, which is beautiful and practical; the composite helmet shell is light in weight, meeting the lightweight requirements; and can withstand greater impact, meeting the functional requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0028] Figure 1 A top view of the mold of the present invention;

[0029] Figure 2 It is a front view of the first mold block in the present invention;

[0030] Figure 3 It is a back view of the first mold block in the present invention;

[0031] Figure 4 It is a back view of the second mold block in the present invention;

[0032] Figure 5 It is a back view of the second mold block in the present invention;

[0033] Figure 6 It is a structural schematic diagram of the positioning component in the present invention;

[0034] Figure 7 It is a structural schematic diagram of the helmet shell in the present invention;

[0035] Among them, 1. the first mold block; 2. the second mold block; 3. the first lifting ring; 4. the second lifting ring; 5. the first cavity; 6. the second cavity; 7. the stepped through hole; 8. the long bolt; 9. the first mounting groove; 10. the second positioning block; 11. the second short bolt; 12. the groove; 13. the second mounting groove; 14. the first short bolt; 15. the first threaded hole; 16. the first positioning block. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] The invention discloses a molding method of a composite material helmet shell, comprising the following steps:

[0039] S1. Material selection: Select the required materials according to the requirements of the helmet shell;

[0040] S2, cutting: cutting the material pieces according to the unfolded view of the helmet shell;

[0041] S3, paving: paving the cut pieces in the helmet shell forming cavity of the mold to form multiple layers, sealing the mold with vacuum auxiliary materials and then evacuating the vacuum to compact the layers;

[0042] S4, curing: After all the layers are laid, the steps are processed, and then the mold is sealed with vacuum auxiliary materials and vacuumed, and then placed in the curing equipment for curing;

[0043] The curing equipment is preferably an autoclave.

[0044] S5. Take out: Take out the mold from the curing equipment and place it on the workbench, remove the vacuum auxiliary material and then take out the molded helmet shell.

[0045] To further optimize the solution, in S1, the materials include aramid fabric prepreg, carbon fiber prepreg and glass fiber. Aramid fabric prepreg, carbon fiber prepreg and glass fiber are mixed and used, of which aramid fabric prepreg accounts for 50%-80%, carbon fiber prepreg accounts for 10%-30%, and glass fiber accounts for 10%-20%.

[0046] Aramid fabric prepreg accounts for 50%-80%, which can ensure that the wear resistance of the helmet shell meets the use requirements. Carbon fiber prepreg accounts for 10%-30%, which enhances the strength of the helmet shell and reduces its weight. Glass fiber accounts for 10%-20%, which protects the helmet shell.

[0047] In one specific example, aramid fabric prepreg accounts for 50%, carbon fiber prepreg accounts for 35%, and glass fiber accounts for 15%.

[0048] To further optimize the solution, in S3, after the first layer of ply is laid, the mold is sealed with vacuum auxiliary materials and then vacuumed to compact the first layer of ply;

[0049] Remove the vacuum auxiliary material and proceed to lay other layers. After every 2-3 layers, seal the mold with the vacuum auxiliary material and then evacuate and perform a compaction operation.

[0050] Vacuum auxiliary materials include vacuum bag film, non-porous isolation film, breathable felt, and sealing tape. The specific usage method can be selected by technical personnel in this field according to their own needs.

[0051] To further optimize the solution, in S3, during the laying process of the ply, the ply covers the margin line;

[0052] The laying temperature of the pavement is 18℃-26℃, and the relative humidity is ≤65%.

[0053] Reference Figures 1 to 6 A composite material helmet shell molding die for realizing a composite material helmet shell molding method comprises: a first mold block 1 and a second mold block 2, a positioning assembly is arranged between the first mold block 1 and the second mold block 2, a connecting structure is arranged between the first mold block 1 and the second mold block 2, a first mold cavity 5 is opened on the first mold block 1, a second mold cavity 6 is opened on the second mold block 2, and the first mold cavity 5 and the second mold cavity 6 are matched to form a helmet shell molding cavity.

[0054] Further optimized, the positioning assembly includes at least two first mounting grooves 9, and the plurality of first mounting grooves 9 are all provided on the side wall where the first mold block 1 and the second mold block 2 are in contact, and there is an angle between the plurality of first mounting grooves 9, and the angle of the angle is 10-170°, and a first positioning block 16 is fixedly installed in the first mounting groove 9 by a first short bolt 14, and the first positioning block 16 is provided with a positioning groove on one side of the opening of the first mounting groove 9;

[0055] The number of the first installation grooves 9 is preferably two, and there is an angle of 90° between the axes of the two first installation grooves 9 .

[0056] At least two second mounting grooves 13, multiple second mounting grooves 13 are all opened on the side wall where the second mold block 2 and the first mold block 1 are fitted, there is an angle between the multiple second mounting grooves 13, the multiple second mounting grooves 13 are arranged one by one with the multiple first mounting grooves 9, and a second positioning block 10 is fixedly installed in the second mounting groove 13 by a second short bolt 11, and the second positioning block 10 is provided with a protrusion that is adapted to and corresponding to the positioning groove.

[0057] The angle of the included angle is 10-170°, and the number is at least two, so as to ensure that the first mold block 1 and the second mold block 2 will not move relative to each other after being matched, thereby ensuring the accuracy of positioning.

[0058] Further optimizing the scheme, the connection structure includes a plurality of step through holes 7, the plurality of step through holes 7 are all opened on the first mold block 1, the plurality of step through holes 7 are arranged in parallel, and long bolts 8 are inserted into the step through holes 7;

[0059] The plurality of first threaded holes 15 are all formed on the side wall of the second mold block 2 . The plurality of first threaded holes 15 are arranged in one-to-one correspondence with the plurality of stepped through holes 7 . One end of the long bolt 8 is threadedly connected in the first threaded hole 15 .

[0060] According to a further optimized solution, two first lifting rings 3 are threadedly connected to the first mold block 1 , and two second lifting rings 4 are threadedly connected to the second mold block 2 .

[0061] According to a further optimized solution, grooves 12 are provided on the side walls opposite to each other of the first mold block 1 and the second mold block 2 .

[0062] The function of the groove 12 is to reduce the weight of the first mold block 1 and the second mold block 2 .

[0063] The helmet shell after molding Figure 7 .

[0064] Helmet shell forming process:

[0065] Mold splicing: align the first mold block 1 and the second mold block 2, connect the protrusion of the second positioning block 10 with the positioning groove of the first positioning block 16, and position the first mold block 1 and the second mold block 2. At this time, the first cavity 5 and the second cavity 6 are aligned to form a helmet shell molding cavity. The first mold block 1 and the second mold block 2 are fixed by long bolts 8, and then 3-5 layers of mold release agent are applied in the helmet shell molding cavity. Each layer of mold release agent is applied at an interval of 15-20 minutes, and then the mold is hoisted onto the workbench through the first lifting ring 3 and the second lifting ring 4;

[0066] Select materials according to needs, cut the materials into pieces according to the unfolded diagram of the helmet shell, lay the pieces in the helmet shell molding cavity to form multiple layers, and after the first layer is laid, use vacuum auxiliary materials to seal the mold and then evacuate, compact the first layer to make it more compact, remove the vacuum auxiliary materials and lay the remaining layers, and perform vacuum compaction every 2-3 layers;

[0067] After all the layers are laid, the steps of the mold are processed in detail to prevent bridging. The mold is then sealed with vacuum auxiliary materials and vacuumed. The mold is then hoisted into the curing equipment for curing. After the curing is completed, the mold is hoisted out of the curing equipment and placed on the workbench. The vacuum auxiliary materials on the surface of the mold are removed, and the composite helmet shell is taken out. The helmet shell is completed.

[0068] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0069] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for forming a composite material helmet shell, characterized in that: The following steps are involved: S1. Material selection: Select the required materials according to the requirements of the helmet shell; S2, cutting: cutting the material pieces according to the unfolded view of the helmet shell; S3, paving: paving the cut pieces in the helmet shell forming cavity of the mold to form multiple layers, sealing the mold with vacuum auxiliary materials and then evacuating the vacuum to compact the layers; S4, curing: After all the layers are laid, the steps are processed, and then the mold is sealed with vacuum auxiliary materials and vacuumed, and then placed in the curing equipment for curing; S5. Take out: Take out the mold from the curing equipment and place it on the workbench, remove the vacuum auxiliary material and then take out the molded helmet shell.

2. The method for forming a composite material helmet shell according to claim 1, characterized in that: In S1, the materials include aramid fabric prepreg, carbon fiber prepreg and glass fiber. Aramid fabric prepreg, carbon fiber prepreg and glass fiber are mixed and used, among which aramid fabric prepreg accounts for 50%-80%, carbon fiber prepreg accounts for 10%-30%, and glass fiber accounts for 10%-20%.

3. The method for forming a composite material helmet shell according to claim 1, characterized in that: In S3, after the first layer of ply is laid, the mold is sealed with vacuum auxiliary materials and then vacuumed to compact the first layer of ply; Remove the vacuum auxiliary material and proceed to lay other layers. After every 2-3 layers, seal the mold with the vacuum auxiliary material and then evacuate and perform a compaction operation.

4. The method for forming a composite material helmet shell according to claim 1, characterized in that: In S3, during the laying process of the ply, the ply covers the allowance line; The laying temperature of the pavement is 18℃-26℃, and the relative humidity is ≤65%.

5. A forming die for a composite material helmet shell used to implement the forming method for a composite material helmet shell according to any one of claims 1 to 4, characterized in that: include: A first mold block (1) and a second mold block (2), a positioning assembly is provided between the first mold block (1) and the second mold block (2), a connecting structure is provided between the first mold block (1) and the second mold block (2), a first mold cavity (5) is provided on the first mold block (1), a second mold cavity (6) is provided on the second mold block (2), and the first mold cavity (5) and the second mold cavity (6) are matched to form a helmet shell molding cavity.

6. The forming die of the composite material helmet shell according to claim 5, characterized in that: The positioning assembly comprises at least two first installation grooves (9), and the plurality of first installation grooves (9) are all arranged on the side wall where the first mold block (1) and the second mold block (2) are in contact, and there is an angle between the plurality of first installation grooves (9), and a first positioning block (16) is fixedly installed in the first installation groove (9) by a first short bolt (14), and the first positioning block (16) is provided with a positioning groove on one side of the opening of the first installation groove (9); At least two second mounting grooves (13), a plurality of the second mounting grooves (13) are all provided on the side wall where the second mold block (2) and the first mold block (1) are in contact, an angle exists between the plurality of the second mounting grooves (13), the plurality of the second mounting grooves (13) are arranged in one-to-one correspondence with the plurality of the first mounting grooves (9), a second positioning block (10) is fixedly installed in the second mounting groove (13) by a second short bolt (11), and the second positioning block (10) is provided with a protrusion adapted to and corresponding to the positioning groove.

7. The forming die of the composite material helmet shell according to claim 5, characterized in that: The connection structure comprises a plurality of stepped through holes (7), the plurality of stepped through holes (7) are all opened on the first mold block (1), the plurality of stepped through holes (7) are arranged in parallel, and long bolts (8) are inserted into the stepped through holes (7); A plurality of first threaded holes (15) are provided on the side wall of the second mold block (2), the plurality of first threaded holes (15) are arranged in one-to-one correspondence with the plurality of step through holes (7), and one end of the long bolt (8) is threadedly connected in the first threaded hole (15).

8. The forming die of the composite material helmet shell according to claim 5, characterized in that: Two first suspension rings (3) are threadedly connected to the first mold block (1), and two second suspension rings (4) are threadedly connected to the second mold block (2).

9. The forming die of the composite material helmet shell according to claim 5, characterized in that: A molding groove (12) is provided on the side walls of the first mold block (1) and the second mold block (2) facing away from each other.

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