A low-cost bulletproof helmet laminate mold and manufacturing method

Abstract

The present invention relates to a low-cost bulletproof helmet laying die and a manufacturing method thereof. The die includes a head mold mounting base, a head mold gypsum body fixedly mounted on the head mold mounting base, a fiberglass reinforced plastic (FRP) shell fixedly mounted on the top of the head mold gypsum body and matching the shape of the bulletproof helmet, and a laying die base rotatably mounted at the top within the head mold mounting base, as well as the steps for manufacturing the die. The FRP shell of the die of the present invention is simple to manufacture and has a fast molding speed. Using the method of the present invention to manufacture the die has a short cycle. 30 bulletproof helmet laying dies can be completed by 3 people in 4 days, and they can also be manufactured in batches and put into use in batches for better effects. Since the materials used are low-cost and easy to obtain, the manufacturing cost is low. The manufacturing process of the die is simple, saving manufacturing time and reducing costs, and is suitable for popularization and application in the industry.

Description

Technical Field

[0001] The present invention relates to a low-cost bulletproof helmet laying die and a manufacturing method thereof, belonging to the technical field of the production of bulletproof products in the category of equipment. Background Art

[0002] Non-metallic bulletproof helmets are protective equipment used to prevent projectiles or fragments from penetrating and effectively protect the human head. They must be worn by the People's Liberation Army, public security police officers, and security personnel when performing special tasks to protect the human head from being injured by projectiles fired by firearms or fragments generated during the explosion of explosives.

[0003] Currently, the non-metallic bulletproof helmets in use adopt aramid materials. Under appropriate manufacturing processes, their bulletproof performance and dent depth are superior to those of helmets made of ultra-high molecular weight polyethylene materials, and the aramid materials have a high melting point and are resistant to high temperatures. Aramid helmets are mainly formed by stacking multiple layers of aramid woven fabric sheets under high temperature and high pressure. The stacking structure of the aramid sheets in the aramid helmet is closely related to the bulletproof performance and anti-fragment performance of the finished helmet shell. The stacking uniformity and number of layers of the aramid sheets in the helmet shell determine the relative number of layers at a random point on the helmet shell, which directly determines the bulletproof performance and anti-fragment performance of the bulletproof helmet.

[0004] Currently, most non-metallic bulletproof helmets adopt aramid materials, and the commonly used laying dies are mostly made of metal materials. Their manufacturing cycle is long and the cost is high, which is not suitable for the processing of products with urgent small-batch tasks. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a fast and low-cost manufacturing method for a bulletproof helmet laying die.

[0006] The present invention adopts the following technical solutions:

[0007] The low-cost bulletproof helmet laying die of the present invention includes a head mold mounting base, a head mold gypsum body fixedly installed on the head mold mounting base, a fiberglass shell fixedly installed on the top of the head mold gypsum body and matching the shape of the bulletproof helmet, and a laying die base rotatably installed at the top in the head mold mounting base.

[0008] The laying die base of the die of the present invention includes a circular chassis, a support column tube fixedly installed in the middle of the circular chassis, a support shaft fixed on the top of the support column tube, and a pressure bearing installed on the top of the support shaft; the top of the support shaft passes through the pressure bearing; a cylindrical pit is provided in the middle of the bottom surface of the head mold gypsum body, and the height and diameter of the cylindrical pit are both larger than the length and diameter of the support shaft above the pressure bearing; a shoulder for preventing the pressure bearing from sliding down is provided on the outside of the support shaft between the pressure bearing and the top of the support column tube, and the pressure bearing is sleeved in the head mold mounting base.

[0009] The head mold mounting base of the mold of the present invention includes a circular ring, an upper cover fixedly installed on the top of the circular ring, and a lower disc fixedly installed at the bottom of the circular ring; an upper circular hole is arranged in the middle of the upper cover, and the diameter of the upper circular hole is at least 10 mm larger than the shaft diameter at the upper end of the support shaft; a lower circular hole is arranged in the middle of the lower disc, the bottom of the circular ring is fixedly sleeved in the lower circular hole, and the inner diameter of the lower circular hole is larger than the outer diameter of the pressure bearing; the outer diameter of the lower disc is smaller than the inner diameter of the opening of the fiberglass shell; the pressure bearing is sleeved in the circular ring and contacts the upper cover, and the top of the support shaft passes through the upper circular hole and is arranged in the cylindrical pit.

[0010] In the mold of the present invention, the inner diameter of the circular ring is 3-5 mm larger than the outer diameter of the pressure bearing; the height of the circular ring is 3-5 mm larger than the thickness of the pressure bearing.

[0011] In the mold of the present invention, the outer diameter of the pressure bearing is slightly larger than the outer diameter of the shaft shoulder.

[0012] The manufacturing method of the low-cost bulletproof helmet laying mold of the present invention adopts the following steps:

[0013] Step S1, manufacturing the fiberglass shell: Clean the inner surface of the finished helmet shell, smooth the edges, then evenly apply lubricating grease on the inner wall surface and edges of the helmet shell, lay two strip-shaped glass cloths in a cross shape on the inner wall of the helmet in sequence, and both ends of each glass cloth are arranged outside the helmet shell. Then evenly brush epoxy resin on the glass cloth, so that the glass cloth soaked with epoxy resin fits smoothly on the inner wall of the helmet, and at the same time scrape out the excess epoxy resin; then rotate the helmet shell 45°, lay the second group of two glass cloths in a cross shape into the helmet, evenly brush epoxy resin, so that the glass cloth adheres smoothly to the first group of glass cloths and scrape out the excess epoxy resin; complete the pasting of six groups of glass cloths in sequence; slightly arrange and trim the glass cloth exposed outside the helmet edge outwards and downwards, then fill the helmet with sand, level and tamp it. Wait until the epoxy resin is completely cured, pour out the sand, take out the manufactured fiberglass shell, mark and cut and trim it according to the helmet size, clean the outer surface and polish it smoothly with fine sandpaper;

[0014] Step S2, manufacturing the head mold mounting base: Make a circular ring with an iron plate with a thickness of 1.5 mm. The inner diameter of the circular ring is 3-5 mm larger than the pressure bearing, and the thickness is 3-5 mm thicker than the pressure bearing. Weld the upper cover on the top of the circular ring, and the outer diameter of the upper cover is 8-10 mm larger than the outer diameter of the circular ring. Sleeve and weld the bottom of the circular ring in the lower circular hole of the lower disc;

[0015] Step S3, making a head mold gypsum body: placing the glass fiber reinforced plastic shell with the opening facing upward on the upper end of the paper tube A with a diameter of 150 mm, cutting the paper tube B with a height of 200 mm and a diameter of 100 mm longitudinally along the axis and fastening it with a rubber band and vertically placing it in the middle of the glass fiber reinforced plastic shell, stirring the gypsum powder with water and pouring it into the paper tube B, filling the inner cavity of the paper tube B, smoothing the upper end to form a gypsum column, digging a cylindrical pit with a diameter similar to that of the upper circular hole in the middle of the top surface of the gypsum column for accommodating the support shaft passing through the top surface of the pressure bearing, removing the paper tube B after the gypsum column solidifies, placing the upper cover of the head mold mounting base in the middle of the top surface of the gypsum column, setting the lower disc on the top, filling the space between the inner cavity of the glass fiber reinforced plastic shell and the lower disc with gypsum slurry to form a gypsum cone with a small top and a large bottom, and smoothing the outer wall of the gypsum cone to form a head mold gypsum body; the top surface of the head mold gypsum body does not exceed the outer edge of the lower disc;

[0016] Step S4, turn the head mold gypsum body bonded to the fiberglass shell made in step 3 180° and place it on a rotating platform, then continue to stick the outer surface of the head mold gypsum body with gypsum slurry and smooth it, and polish the head mold gypsum body after the gypsum is dry, so that its overall outer surface is uniform and smooth and extends outward and downward in a cone shape, the top outer wall of the head mold gypsum body is smoothly connected to the fiberglass shell, and the lower end size of the head mold gypsum body is 3-5mm larger than the edge of the fiberglass shell, and the head mold gypsum body is mounted on the base of the paving mold.

[0017] Step 4 of the method of the present invention is to brush epoxy resin on the outer surface of the polished and smooth head mold gypsum body.

[0018] The positive effects of the present invention are as follows: the glass fiber reinforced plastic shell of the mold of the present invention is simple to make and can be formed quickly. The outer diameter of the upper cover is larger than the outer diameter of the circular ring, which is convenient for welding and processing; the diameter of the upper circular hole is at least 10mm larger than the shaft diameter at the upper end of the support shaft, so that sufficient margin is left to prevent mutual interference during installation. The outer diameter of the pressure bearing is slightly larger than the outer diameter of the shaft shoulder, and the shaft shoulder can support the pressure bearing to prevent it from sliding downward; the size of the lower end of the head mold gypsum body is 3-5mm larger than the outer edge of the glass fiber reinforced plastic shell, and the overall outer surface is uniformly smooth and extends outward and downward, so that a certain draft angle can be formed, making it easy to remove the paved helmet. The mold making cycle of the present invention method is short, and 30 bulletproof helmet paving molds can be completed by 3 people in 4 days. It can also be made in batches, and the effect of putting them into use in batches is better; because the materials used are low-priced and easy to find, the production cost is low; the mold making process is simple, saving production time and reducing costs, and it is suitable for popularization and application in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is a schematic diagram of the mold structure of the present invention;

[0020] Attached Figure 2 This is a schematic diagram of the assembly structure of the head mold mounting base parts of the mold of the present invention;

[0021] AttachedFigure 3 Schematic diagram of the installation of the pressure bearing structure on the laying die base of the mold of the present invention;

[0022] Appendix Figure 4 Schematic diagram of the assembly structure of the laying die base and the pressure bearing part of the mold of the present invention;

[0023] Appendix Figure 5 Schematic diagram of the manufacturing process structure of the method of the present invention. Specific embodiments

[0024] As shown in the appendix Figure 1 As shown, the mold of the present invention includes a head mold installation base 2, a head mold gypsum body 3 fixedly installed on the head mold installation base 2, a fiberglass shell 1 fixedly installed on the top of the head mold gypsum body 3 and matching the shape of the bulletproof helmet, and a laying die base 4 rotatably installed at the top in the head mold installation base 2; the head mold gypsum body 3 is in an irregular conical shape with a smaller top and a larger bottom.

[0025] As shown in the appendix Figure 1 , 3 , 4, the laying die base 4 of the mold of the present invention includes a circular chassis 43, a support column tube 42 fixedly installed in the middle of the circular chassis 43, a support shaft 41 fixed on the top of the support column tube 42, and a pressure bearing 5 installed on the top of the support shaft 41; the top of the support shaft 41 passes through the pressure bearing 5; a cylindrical pit 31 is provided in the middle of the bottom surface of the head mold gypsum body 3, and the height and diameter of the cylindrical pit 31 are both larger than the length and diameter of the support shaft 41 above the pressure bearing 5; a shoulder 44 for preventing the pressure bearing 5 from sliding down is provided on the outside of the support shaft 41 between the pressure bearing 5 and the top of the support column tube 42, and the pressure bearing 5 is sleeved in the head mold installation base 2.

[0026] As shown in the appendix Figure 1 , 2As shown in the figure, the head mold mounting base 2 of the mold of the present invention includes a circular ring 22, an upper cover 21 fixedly installed on the top of the circular ring 22, and a lower disc 23 fixed to the bottom of the circular ring 22. The outer diameter of the upper cover 21 is 8 - 10 mm larger than the outer diameter of the circular ring 22, which is convenient for welding and processing. An upper circular hole 24 is provided in the middle of the upper cover 21, and the diameter of the upper circular hole 24 is at least 10 mm larger than the shaft diameter at the upper end of the support shaft 41, leaving enough margin to prevent interference during installation. A lower circular hole 25 is provided in the middle of the lower disc 23, and the inner diameter of the lower circular hole 25 is larger than the outer diameter of the pressure bearing 5. The outer diameter of the lower disc 23 is smaller than the inner diameter of the opening of the fiberglass shell 1. The pressure bearing 5 is sleeved in the circular ring 22 and contacts the upper cover 21. The top of the support shaft 41 passes through the upper circular hole 24 and is arranged in the cylindrical pit 31 to prevent the support shaft 41 from contacting and rubbing against the head mold gypsum body 3 to generate debris and fall into the pressure bearing 5. The head mold gypsum body 3 rotates with the pressure bearing 5. The inner diameter of the circular ring 22 is 3 - 5 mm larger than the outer diameter of the pressure bearing 5. The height of the circular ring 22 is 3 - 5 mm larger than the thickness of the pressure bearing 5.

[0027] As shown in the attached Figure 5 figure, the manufacturing method of the low - cost bulletproof helmet lay - up mold of the present invention adopts the following steps:

[0028] Step S1, manufacturing the fiberglass shell 1: Clean the inner surface of the finished helmet shell, smooth the edges by grinding, then evenly apply lubricating grease on the inner wall surface and edges of the helmet shell. Lay two strip - shaped glass cloths in a cross - shaped pattern on the inner wall of the helmet in sequence, with both ends of each glass cloth set outside the helmet shell. Then evenly brush epoxy resin on the glass cloth, so that the glass cloth soaked with epoxy resin fits smoothly on the inner wall of the helmet, and at the same time scrape out the excess epoxy resin. Then rotate the helmet shell by 45°, lay the second group of two glass cloths in a cross - shaped pattern into the helmet, evenly brush epoxy resin, make the glass cloth smoothly adhere to the first group of glass cloths and scrape out the excess epoxy resin. Complete the pasting of six groups of glass cloths in sequence. Slightly tidy and trim the glass cloth exposed outside the helmet edge outwards and downwards, then fill the helmet with sand, level and tamp it to make the glass cloth fully fit the helmet shell to ensure the quality of the reverse mold. After eight hours, the epoxy resin is completely cured, pour out the sand, take out the made fiberglass shell, mark and cut and trim it according to the helmet shell size, clean the outer surface and polish it smooth with fine sandpaper.

[0029] Step S2, manufacturing the head mold mounting base: Make the circular ring 22 with an iron plate with a thickness of 1.5 mm. The inner diameter of the circular ring 22 is 3 - 5 mm larger than the pressure bearing 5, and the thickness is 3 - 5 mm thicker than the pressure bearing 5. Weld the upper cover 21 on the top of the circular ring 22, the outer diameter of the upper cover 21 is 8 - 10 mm larger than the outer diameter of the circular ring 22 - 2, and weld the lower disc 23 to the bottom of the circular ring 22.

[0030] Step S3, manufacturing the head mold plaster body 3: Place the fiberglass shell 1 with its opening facing upwards on the upper port of a paper tube A6 with a diameter of 150 mm. Vertically cut a paper tube B7 with a height of 200 mm and a diameter of 100 mm along its axis, secure it with a rubber band, and vertically place it in the middle of the fiberglass shell 1. After evenly stirring the gypsum powder with water, pour it into the paper tube B7. When the inner cavity of the paper tube B7 is filled, level the upper port to make a gypsum column 8. Dig a cylindrical pit 31 in the middle of the top surface of the gypsum column 8 with a diameter close to that of the upper round hole 24 for accommodating the support shaft 41 on the top surface of the pressure bearing 5. The height of the cylindrical pit 31 is 10 - 15 mm. After the gypsum column 8 solidifies, remove the paper tube B7. Place the upper cover 21 of the head mold mounting base 2 on the middle of the top surface of the gypsum column 8, and set the lower disc 23 above. Fill the space between the inner cavity of the fiberglass shell 1 and the lower disc 23 with gypsum slurry to form a gypsum cone with a smaller upper part and a larger lower part. Trim the outer wall of the gypsum cone to be smooth to make the head mold plaster body 3; the top surface of the head mold plaster body 3 does not exceed the outer edge of the lower disc 23.

[0031] Step S4, place the head mold plaster body 3 bonded to the fiberglass shell 1 made in step three on the rotating platform after flipping it 180°. Then, continue to paste the outer surface of the head mold plaster body 3 with gypsum slurry. During the process of pasting the gypsum slurry, rotate the rotating platform to make the gypsum slurry evenly distributed, and then smooth it with a scraper. After the gypsum dries, polish the head mold plaster body 3 to make its overall outer surface evenly smooth and extend outwards and downwards, and smoothly connect with the fiberglass shell 1, so that the size of the lowermost end of the head mold plaster body 3 is 3 - 5 mm larger than the edge of the fiberglass shell 1. Set the head mold plaster body 3 on the laying die base 4; brush the outer surface of the polished head mold plaster body 3 with epoxy resin; the epoxy resin can make the surface of the fiberglass shell 1 smooth and easy to demold; second, it can improve the surface hardness of the whole mold and make the mold durable.

[0032] The fiberglass shell 1 of the mold of the present invention is simple to manufacture and has a fast forming speed. The outer diameter of the upper cover 21 is larger than the outer diameter of the ring 22, which is convenient for welding and processing; the diameter of the upper round hole 24 is at least 10 mm larger than the shaft diameter at the upper end of the support shaft 41, so as to leave enough margin to prevent interference during installation. The outer diameter of the pressure bearing 5 is slightly larger than the outer diameter of the shaft shoulder 44, and the shaft shoulder 44 can support the pressure bearing 5 to prevent it from sliding downwards; the lower end size of the head mold plaster body 3 is 3 - 5 mm larger than the outer edge of the fiberglass shell, and the overall outer surface is evenly smooth and extends outwards and downwards, so that a certain draft angle can be formed, making it easy to remove the laid helmet. Using the method of the present invention to manufacture the mold has a short cycle. 30 bulletproof helmet laying molds can be completed by 3 people in 4 days, and can also be manufactured in batches. The effect is better when put into use in batches; because the materials used are low-cost and easy to find, the manufacturing cost is low; the manufacturing process is simple, saving manufacturing time and reducing costs, and is suitable for popularization and application in the industry.

[0033] At present, the technical solution of this application has been pilot-tested, that is, small-scale experiments before large-scale mass production; after the pilot test, user usage research has been carried out on a small scale, and the research results show that the user satisfaction is relatively high; now preparations are underway for the formal production and industrialization of the product.

Claims

1. A manufacturing method of a low-cost bulletproof helmet lay-up mold, characterized in that, The mold includes a head mold mounting base (2), a head mold gypsum body (3) fixedly mounted on the head mold mounting base (2), a fiberglass shell (1) fixedly mounted on the top of the head mold gypsum body (3) and matching the shape of the bulletproof helmet, and a lay-up mold base (4) rotatably mounted on the top in the head mold mounting base (2); The lay-up mold base (4) includes a circular chassis (43), a support column tube (42) fixedly mounted in the middle of the circular chassis (43), a support shaft (41) fixed on the top of the support column tube (42), and a pressure bearing (5) mounted on the top of the support shaft (41); the top of the support shaft (41) passes through the pressure bearing (5); a cylindrical pit (31) is provided in the middle of the bottom surface of the head mold gypsum body (3), and the height and diameter of the cylindrical pit (31) are both larger than the length and diameter of the support shaft (41) above the pressure bearing (5); a shoulder (44) for preventing the pressure bearing (5) from sliding down is provided on the outside of the support shaft (41) between the pressure bearing (5) and the top of the support column tube (42), and the pressure bearing (5) is sleeved in the head mold mounting base (2); The head mold mounting base (2) includes a ring (22), an upper cover (21) fixedly mounted on the top of the ring (22), and a lower disc (23) fixed on the bottom of the ring (22); an upper circular hole (24) is provided in the middle of the upper cover (21), and the diameter of the upper circular hole (24) is at least 10 mm larger than the shaft diameter at the upper end of the support shaft (41); a lower circular hole (25) is provided in the middle of the lower disc (23), the bottom of the ring (22) is fixedly sleeved in the lower circular hole (25), and the inner diameter of the lower circular hole (25) is larger than the outer diameter of the pressure bearing (5); the outer diameter of the lower disc (23) is smaller than the inner diameter of the opening of the fiberglass shell (1); the pressure bearing (5) is sleeved in the ring (22) and contacts the upper cover (21), and the top of the support shaft (41) passes through the upper circular hole (24) and is arranged in the cylindrical pit (31); The manufacturing method adopts the following steps: Step S1, manufacturing the fiberglass shell (1): Clean the inner surface of the finished helmet shell, polish the edges smoothly, then evenly apply lubricating grease on the inner wall surface and edges of the helmet shell, lay two strip-shaped glass cloths in a cross shape on the inner wall of the helmet in turn, and both ends of each glass cloth are arranged outside the helmet shell. Then evenly brush epoxy resin on the glass cloth, so that the glass cloth soaked with epoxy resin fits smoothly on the inner wall of the helmet, and at the same time scrape out the excess epoxy resin; then rotate the helmet shell by 45°, lay the second group of two glass cloths in a cross shape into the helmet shell, evenly brush epoxy resin, make the glass cloth fit smoothly on the first group of glass cloths and scrape out the excess epoxy resin; complete the pasting of six groups of glass cloths in turn; slightly trim and tidy up the glass cloth exposed outside the helmet edge outwards and downwards, then fill the helmet with sand, level it and tamp it. Wait until the epoxy resin is completely cured, pour out the sand, take out the made fiberglass shell and cut and trim it according to the helmet size, clean the outer surface and polish it smoothly with fine sandpaper; Step S2, making a head mold mounting base: using an iron plate with a thickness of 1.5 mm to make a circular ring (22), the inner diameter of the circular ring (22) is 3-5 mm larger than the pressure bearing (5), and the thickness is 3-5 mm thicker than the pressure bearing (5), welding the upper cover (21) on the top of the circular ring (22), the outer diameter of the upper cover (21) is 8-10 mm larger than the outer diameter of the circular ring (22), and the bottom of the circular ring (22) is welded in the lower circular hole (25) of the lower disc (23); Step S3, making a head mold plaster body (3): placing the glass fiber reinforced plastic shell (1) with the opening facing upward on the upper end of a paper tube A (6) with a diameter of 150 mm, cutting a paper tube B (7) with a height of 200 mm and a diameter of 100 mm longitudinally along the axis and fastening it with a rubber band and vertically placing it in the middle of the glass fiber reinforced plastic shell (1), stirring the gypsum powder with water and pouring it into the paper tube B (7), filling the inner cavity of the paper tube B (7) and smoothing the upper end to form a gypsum column (8), digging a hole with a diameter similar to that of the upper circular hole (24) in the middle of the top surface of the gypsum column (8) to accommodate the passage of The cylindrical recess (31) of the support shaft (41) on the top surface of the pressure bearing (5) is removed. After the gypsum column (8) solidifies, the paper tube B (7) is removed. The upper cover (21) of the head mold mounting base (2) is placed in the middle of the top surface of the gypsum column (8), and the lower disc (23) is arranged on the top. The space between the inner cavity of the glass fiber reinforced plastic shell (1) and the lower disc (23) is filled with gypsum slurry to form a gypsum cone with a small top and a large bottom. The outer wall of the gypsum cone is smoothed to form a head mold gypsum body (3); the top surface of the head mold gypsum body (3) does not exceed the outer edge of the lower disc (23); Step S4, the head mold gypsum body (3) bonded to the glass fiber reinforced plastic shell (1) prepared in step 3 is turned over 180 degrees and placed on a rotating platform, and then the outer surface of the head mold gypsum body (3) is continued to be bonded with gypsum slurry and smoothed. After the gypsum is dried, the head mold gypsum body (3) is polished so that its overall outer surface is uniform and smooth and extends outward and downward in a cone shape. The top outer wall of the head mold gypsum body (3) is smoothly connected to the glass fiber reinforced plastic shell (1), and the lower end size of the head mold gypsum body (3) is 3-5 mm larger than the edge of the glass fiber reinforced plastic shell (1). The head mold gypsum body (3) is mounted on the paving mold base (4).

2. The manufacturing method of a low-cost bulletproof helmet lay-up mold according to claim 1, characterized in that, The inner diameter of the circular ring (22) is 3-5 mm larger than the outer diameter of the pressure bearing (5); and the height of the circular ring (22) is 3-5 mm larger than the thickness of the pressure bearing (5).

3. The manufacturing method of a low-cost bulletproof helmet lay-up mold according to claim 2, characterized in that, The outer diameter of the pressure bearing (5) is slightly larger than the outer diameter of the shaft shoulder (44).

4. The manufacturing method of a low-cost bulletproof helmet lay-up mold according to claim 1, characterized in that, The outer surface of the head mold plaster body (3) polished smooth in step 4 is coated with epoxy resin.

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