A method for preparing a helmet built-in Kevlar skeleton original mold

Abstract

The invention relates to a method for preparing a helmet built-in Kevlar skeleton original mold, comprising: step S1, drawing a three-dimensional model of a helmet structure; step S2, drawing a three-dimensional model of a Kevlar skeleton according to design data of the three-dimensional model of the helmet structure; step S3, adapting and revising the three-dimensional model of the Kevlar skeleton and the three-dimensional model of the helmet structure, if the adaptation is unqualified, drawing a revised three-dimensional model of the Kevlar skeleton, if the adaptation is qualified, using the three-dimensional model of the Kevlar skeleton as basic data for drawing a three-dimensional model of a Kevlar skeleton original mold, for making a Kevlar skeleton original mold and synchronously designing and making a silicone mold, which can shorten the development cycle, enable the Kevlar skeleton to be used in the first EPS molding trial mold of the helmet mold, and confirm the coordination of the Kevlar skeleton 3D modeling and the helmet 3D modeling data, thereby eliminating the risk of manual design and uncertainty in making the original mold, and improving the first-time qualified rate of the trial mold and the qualified rate of mass production.

Description

Technical Field

[0001] The invention relates to the technical field of helmets, and in particular to a method for preparing a helmet built-in Kevlar skeleton original mold. Background Art

[0002] Kevlar skeleton helmet is a kind of helmet with Kevlar fiber as reinforcement material, which has the characteristics of high strength, light weight, heat resistance, easy processing and molding, etc. Kevlar helmet can provide secondary protection, can effectively prevent the penetration of bullets of a certain speed and mass, has a good protection area and protection level, and because of its excellent protection performance, it is widely used in occasions that require high-intensity protection, such as military, police, outdoor sports and other fields;

[0003] The production method of the Kevlar skeleton original mold of the traditional helmet is as follows: on the basis of the necessary 3D modeling of the helmet structure, the blister, EPS molding and other molds required for the production of the helmet are first produced through mold 3D modeling, CNC programming and processing, mold matching and other processes, and then the EPS foamed helmet model is obtained through the T0 trial mold of the EPS molding mold, and then a groove is made on the surface of the EPS helmet model, and the model of the helmet Kevlar skeleton can be taken out by filling the groove and the surrounding with mud. This model is called the Kevlar skeleton original mold. After that, the first set of silicone molds is made through the original mold, and then the Kevlar skeleton is made from the silicone mold for the T1 trial mold. The problems are fed back through the trial mold and the original mold is further optimized, and then the second set of silicone molds and Kevlar skeletons are remade for the T2 trial mold. The final original mold is obtained in this way. We can use the final original mold to repeatedly produce a sufficient number of silicone molds for mass production of Kevlar skeletons. The original mold acquisition process in the above technology is cumbersome and complicated, with low precision, low efficiency, poor consistency of replication, and extremely high technical requirements for the production personnel;

[0004] In order to solve the above problems, the present invention proposes a method for preparing a helmet built-in Kevlar skeleton prototype. Summary of the invention

[0005] (1) Technical issues to be solved

[0006] The purpose of the present invention is to overcome the technical problems in the traditional Kevlar skeleton production that the original mold obtaining process is cumbersome and complicated, the precision is low, the efficiency is low, the consistency of replication is poor, and the technical requirements for the production personnel are extremely high. To this end, the present invention provides a method for preparing a helmet built-in Kevlar skeleton original mold.

[0007] (2) Technical solution

[0008] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0009] A method for preparing a helmet built-in Kevlar skeleton prototype, comprising:

[0010] Step S1, drawing a three-dimensional model of the helmet structure, and the drawing software can be any one of Rhino, SOLIDWORKS, Maya, ZBrush, 3ds Max, KeyShot and SketchUp;

[0011] Step S2, drawing a three-dimensional model of the Kevlar frame according to the design data of the three-dimensional model of the helmet structure, ensuring that the Kevlar frame can accurately fit the helmet structure and meet the design requirements;

[0012] Step S3, adapting and revising the three-dimensional model of the Kevlar skeleton and the three-dimensional model of the helmet structure. If the adaptation is unqualified, drawing a revised three-dimensional model of the Kevlar skeleton. If the adaptation is qualified, using the three-dimensional model of the Kevlar skeleton as basic data for drawing the three-dimensional model of the Kevlar skeleton original mold, ensuring that the three-dimensional model of the Kevlar skeleton is completely matched with the three-dimensional model of the helmet structure in size, shape and position, so as to ensure the structural integrity and functionality of the final product;

[0013] Step S4, forming the three-dimensional model of the Kevlar skeleton original mold according to the design data to obtain the original mold of the Kevlar skeleton, and making the original mold of the Kevlar skeleton lays a solid foundation for subsequent production and application;

[0014] Step S5, using a liquid forming process to prepare a silicone mold test mold for producing a Kevlar skeleton on the basis of the convex mold of the original mold of the Kevlar skeleton, the process is as follows: first, the through holes set on the Kevlar skeleton original mold are blocked with materials such as plasticine, and then a release agent is sprayed on the original mold for subsequent demolding, and then the mixed silicone rubber is slowly poured into the mold to ensure that the silicone uniformly covers all parts of the Kevlar skeleton original mold model and retains at least 2 mm of silicone covering layer, and then a certain amount of time is required for the silicone to cure, and the curing time varies according to the type and brand of silicone. After the silicone is cured, a layer of oil mud of not less than 6 mm is covered on the silicone. Finally, after the oil mud is cured, it is blown and ejected through the through holes set on the original mold to peel the silicone mold from the Kevlar skeleton original mold;

[0015] Step S6, using a winding molding process to shape the aramid fiber material on the silicone mold test model to obtain a Kevlar test skeleton, and impregnating the aramid fiber material in a suitable resin to enhance the adhesion of the fiber and the overall performance of the skeleton. According to the requirements of the winding molding process, different winding methods can be used, such as hoop winding, plane winding or spiral winding, etc. During the winding process, it is necessary to control the winding tension and speed to ensure that the fiber is evenly and tightly wound on the model. During the winding process or after the winding is completed, heating and curing are performed. After the resin is hardened, a solid Kevlar test skeleton can be formed. After the curing is completed, the Kevlar test skeleton can be taken out from the silicone mold test mold;

[0016] Step S7, revising the Kevlar test skeleton and the EPS molding mold test mold for making the helmet structure. If the mold test fails, the EPS molding mold for making the helmet structure is revised. If the mold test passes, the silicone mold test mold corresponding to the Kevlar test skeleton is used as the silicone mold for mass production of the Kevlar skeleton. If the mold test result shows that the Kevlar test skeleton does not match the EPS molding mold or there are other problems, the EPS molding mold needs to be revised to ensure that the next mold test can obtain better results. If the mold test result is qualified, that is, the Kevlar test skeleton and the EPS molding mold match well and no problems are found, then the silicone mold test mold corresponding to the Kevlar test skeleton can be confirmed as the silicone mold for mass production of the Kevlar skeleton;

[0017] Step S8, using the original mold of the Kevlar skeleton to replicate the silicone mold to achieve mass production of the Kevlar skeleton. According to the above method, more original molds of the Kevlar skeleton can be obtained to replicate the silicone mold to obtain a Kevlar skeleton of standard size.

[0018] Preferably, the preparation steps of the EPS forming mold include:

[0019] A1, drawing a three-dimensional model of the helmet mold according to the design data based on the three-dimensional model of the helmet structure, and machining the model of the accessories of the helmet mold after programming in a CNC machining center to obtain the model of the accessories of the helmet mold. The preparation of the accessories of the helmet mold is a CNC processing method;

[0020] A2, making an accessory model adapted to the helmet mold and assembling the accessories to form an EPS molding mold for making a helmet structure. The EPS molding mold includes multiple accessories, which can be a punch, a die, a circle, a slider and other parts, so as to facilitate the demolding process of the helmet structure.

[0021] Preferably, the Kevlar test skeleton in step S7 needs to be bonded to the inner wall of the helmet blister shell in the EPS molding mold by adhesive strips according to design requirements, so that the Kevlar test skeleton is suspended relative to the EPS molding mold, and the Kevlar test skeleton is bonded to the inner wall of the EPS molding mold using adhesive strips according to design requirements to ensure that the skeleton does not directly contact the bottom or other parts of the mold. During bonding, ensure that the adhesive strips are evenly distributed and the bonding strength is moderate to avoid excessive stretching or compression of the adhesive strips to avoid affecting the shape and position of the skeleton.

[0022] Preferably, a through hole is provided on the original mold of the Kevlar skeleton, and the silicone mold test mold can be ejected by blowing, so as to facilitate demoulding of the silicone mold test mold and the original mold of the Kevlar skeleton.

[0023] Preferably, the original mold of the Kevlar skeleton is made by machining technology. The process is to first program the CNC machining center using programming software such as MasterCAM, generate a machining path based on the design data of the three-dimensional model of the Kevlar skeleton, and then upload the program to the CNC machining center, select suitable tools and materials (such as metal, plastic, oil clay, etc.), and perform precision cutting. After the processing is completed, an accurate original mold of the Kevlar skeleton is obtained.

[0024] Preferably, the Kevlar skeleton original mold is made by 3D printing technology, and the three-dimensional model of the Kevlar skeleton original mold is a solid structure or a hollow structure. The 3D printing process is to first select suitable 3D printing materials (such as printing materials with a heat deformation temperature ≥ 80°C) according to the three-dimensional model of the Kevlar skeleton original mold, and then use a 3D printer, such as Carbon's DLS technology, to quickly produce high-quality end-use products from the resin pool. After printing is completed, an accurate Kevlar skeleton original mold is obtained.

[0025] Beneficial effects:

[0026] (1) The present invention provides a method for preparing a helmet built-in Kevlar skeleton original mold, which is used to simultaneously design and manufacture the Kevlar skeleton original mold and the silicone mold, which can shorten the development cycle and enable the Kevlar skeleton to be used in the first EPS molding trial of the helmet mold;

[0027] (2) The present invention provides a method for preparing a helmet built-in Kevlar skeleton original mold, which eliminates the risk of manual design and uncertainty in making the original mold by coordinating and confirming the 3D modeling of the Kevlar skeleton and the 3D modeling data of the helmet, improves the first-time qualified rate of the mold trial and the qualified rate of mass production, and can improve the preparation accuracy of the Kevlar skeleton;

[0028] (3) The present invention provides a method for preparing a helmet built-in Kevlar skeleton original mold. Since the original mold for making the Kevlar skeleton is designed by 3D modeling, accurate data of the Kevlar skeleton original mold can be obtained, so that when the original mold is damaged, it can be copied or multiple original molds can be used for production, thereby improving the production efficiency of the silicone mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a process for preparing a conventional helmet built-in Kevlar skeleton prototype;

[0030] Figure 2 It is a schematic flow chart of a method for preparing a helmet built-in Kevlar skeleton original mold according to the present invention;

[0031] Figure 3 A three-dimensional diagram of an original mold of a Kevlar skeleton in a method for preparing an original mold of a helmet with a built-in Kevlar skeleton according to the present invention;

[0032] Figure 4 The present invention is a structural cross-sectional view of an original mold of a Kevlar skeleton in a method for preparing an original mold of a helmet with a built-in Kevlar skeleton. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] The following is combined with Figure 1-4 The present invention is further described with examples:

[0035] Embodiment 1, as Figure 1-3 As shown, a method for preparing a helmet with a built-in Kevlar skeleton prototype comprises:

[0036] Step S1, drawing a three-dimensional model of the helmet structure;

[0037] Step S2, drawing a three-dimensional model of the Kevlar frame according to the design data of the three-dimensional model of the helmet structure;

[0038] Step S3, adapting and revising the three-dimensional model of the Kevlar skeleton and the three-dimensional model of the helmet structure. If the adaptation is unqualified, drawing a revised three-dimensional model of the Kevlar skeleton. If the adaptation is qualified, using the three-dimensional model of the Kevlar skeleton as basic data for drawing the three-dimensional model of the Kevlar skeleton original model;

[0039] Step S4, forming the three-dimensional model of the Kevlar skeleton original mold according to the design data to obtain the Kevlar skeleton original mold 100;

[0040] The three-dimensional model of the Kevlar skeleton original mold is manufactured by machining technology;

[0041] Step S5, using a liquid forming process to prepare a silicone mold test mold for producing a Kevlar frame based on the convex mold 101 of the original mold 100 of the Kevlar frame;

[0042] Wherein, the original mold 100 of the Kevlar skeleton is provided with a through hole 102;

[0043] Step S6, shaping the aramid fiber material on the silicone mold test mold by a winding molding process to obtain a Kevlar test frame;

[0044] Step S7, revising the Kevlar test frame and the EPS molding mold trial mold for making the helmet structure. If the trial mold fails, the EPS molding mold for making the helmet structure is revised. If the trial mold passes, the silicone mold test model corresponding to the Kevlar test frame is used as the silicone mold model for mass production of the Kevlar frame;

[0045] Among them, the Kevlar test frame needs to be bonded to the inner wall of the helmet blister shell in the EPS molding mold by adhesive strips according to the design requirements, so that the Kevlar test frame is suspended relative to the EPS molding mold;

[0046] The preparation steps of the EPS forming mold include:

[0047] A1, drawing a three-dimensional model of the helmet mold according to the three-dimensional model of the helmet structure according to the design data, and machining it using a CNC machining center after programming to obtain an accessory model of the helmet mold;

[0048] A2, making an accessory model adapted to the helmet mold and assembling the accessories to form an EPS molding mold for making a helmet structure;

[0049] Step S8, using the original mold 100 of the Kevlar skeleton to replicate the silicone mold to achieve mass production of the Kevlar skeleton.

[0050] Embodiment 2, as Figure 1-4 As shown, a method for preparing a helmet with a built-in Kevlar skeleton prototype comprises:

[0051] Step S1, drawing a three-dimensional model of the helmet structure;

[0052] Step S2, drawing a three-dimensional model of the Kevlar frame according to the design data of the three-dimensional model of the helmet structure;

[0053] Step S3, adapting and revising the three-dimensional model of the Kevlar skeleton and the three-dimensional model of the helmet structure. If the adaptation is unqualified, drawing a revised three-dimensional model of the Kevlar skeleton. If the adaptation is qualified, using the three-dimensional model of the Kevlar skeleton as basic data for drawing the three-dimensional model of the Kevlar skeleton original model;

[0054] Step S4, forming the three-dimensional model of the Kevlar skeleton original mold according to the design data to obtain the Kevlar skeleton original mold 100;

[0055] The three-dimensional model of the Kevlar skeleton original mold is made by 3D printing technology, and the three-dimensional model of the Kevlar skeleton original mold is a hollow structure;

[0056] Step S5, using a liquid forming process to prepare a silicone mold test mold for producing a Kevlar frame based on the convex mold 101 of the original mold 100 of the Kevlar frame;

[0057] The original mold 100 of the Kevlar skeleton is provided with a through hole 102. Figure 4 As shown, the original mold 100 of the Kevlar skeleton is composed of a hollow inner core 103 and a solid surface layer 104 wrapped around the outer wall of the hollow inner core 103. The hollow structure can reduce the amount of 3D printing materials used and reduce the weight of the original mold 100 of the Kevlar skeleton;

[0058] Step S6, shaping the aramid fiber material on the silicone mold test mold by a winding molding process to obtain a Kevlar test frame;

[0059] Step S7, revising the Kevlar test frame and the EPS molding mold trial mold for making the helmet structure. If the trial mold fails, the EPS molding mold for making the helmet structure is revised. If the trial mold passes, the silicone mold test model corresponding to the Kevlar test frame is used as the silicone mold model for mass production of the Kevlar frame;

[0060] Among them, the Kevlar test frame needs to be bonded to the inner wall of the helmet blister shell in the EPS molding mold by adhesive strips according to the design requirements, so that the Kevlar test frame is suspended relative to the EPS molding mold;

[0061] The preparation steps of the EPS forming mold include:

[0062] A1, drawing a three-dimensional model of the helmet mold according to the three-dimensional model of the helmet structure according to the design data, and machining it using a CNC machining center after programming to obtain an accessory model of the helmet mold;

[0063] A2, making an accessory model adapted to the helmet mold and assembling the accessories to form an EPS molding mold for making a helmet structure;

[0064] Step S8, using the original mold 100 of the Kevlar skeleton to replicate the silicone mold to achieve mass production of the Kevlar skeleton.

[0065] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A method for preparing a helmet with a built-in Kevlar skeleton original mold, characterized in that: include: Step S1, drawing a three-dimensional model of the helmet structure; Step S2, drawing a three-dimensional model of the Kevlar skeleton according to the design data of the three-dimensional model of the helmet structure; Step S3, adapting and revising the three-dimensional model of the Kevlar skeleton and the three-dimensional model of the helmet structure. If the adaptation is unqualified, drawing a revised three-dimensional model of the Kevlar skeleton. If the adaptation is qualified, using the three-dimensional model of the Kevlar skeleton as basic data for drawing the three-dimensional model of the Kevlar skeleton original model; Step S4, forming the three-dimensional model of the Kevlar skeleton original mold according to the design data to obtain the original mold of the Kevlar skeleton; Step S5, preparing a silicone mold test mold for producing a Kevlar skeleton based on the convex mold of the original mold of the Kevlar skeleton by using a liquid forming process; Step S6, shaping the aramid fiber material on the silicone test mold by a winding molding process to obtain a Kevlar test frame; Step S7, revising the Kevlar test frame and the EPS molding mold trial mold for making the helmet structure. If the trial mold fails, the EPS molding mold for making the helmet structure is revised. If the trial mold passes, the silicone mold trial mold corresponding to the Kevlar test frame is used as a silicone mold for mass production of the Kevlar frame; Step S8, using the original mold of the Kevlar skeleton to replicate the silicone mold to achieve mass production of the Kevlar skeleton; The Kevlar test frame in step S7 needs to be bonded to the inner wall of the helmet blister shell in the EPS molding mold by adhesive strips according to design requirements, so that the Kevlar test frame is suspended relative to the EPS molding mold; Wherein, a through hole is arranged on the original mold of the Kevlar frame.

2. The method for preparing a helmet with a built-in Kevlar skeleton original mold according to claim 1, characterized in that: The preparation steps of the EPS forming mold include: A1, drawing a three-dimensional model of the helmet mold according to the three-dimensional model of the helmet structure according to the design data, and machining it using a CNC machining center after programming to obtain an accessory model of the helmet mold; A2, making an accessory model adapted to the helmet mold and assembling the accessories to form an EPS molding mold for making a helmet structure.

3. A method for preparing a helmet built-in Kevlar skeleton original mold according to any one of claims 1-2, characterized in that: The original mold of the Kevlar frame is manufactured by machining technology.

4. A method for preparing a helmet with a built-in Kevlar skeleton original mold according to any one of claims 1-2, characterized in that: The original mold of the Kevlar skeleton is made by 3D printing technology, and the original mold of the Kevlar skeleton is a solid structure or a hollow structure.

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