CN115847866A - Nonmetal bulletproof helmet and preparation device and preparation method thereof - Google Patents
Nonmetal bulletproof helmet and preparation device and preparation method thereof Download PDFInfo
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- CN115847866A CN115847866A CN202211626051.6A CN202211626051A CN115847866A CN 115847866 A CN115847866 A CN 115847866A CN 202211626051 A CN202211626051 A CN 202211626051A CN 115847866 A CN115847866 A CN 115847866A
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Abstract
The invention provides a non-metal bulletproof helmet and a preparation device and a preparation method thereof, aiming at the requirements of continuous weight reduction and prevention increase of the bulletproof helmet and the problems of insufficient exertion of the bulletproof performance and poor stability of high-strength fiber in the existing composite helmet preparation process, the invention provides a novel helmet preparation device based on the current performance situation of the existing high-strength and high-modulus fiber, and the bulletproof helmet meeting the optimized requirement of the bulletproof performance is prepared through a special traction process; the invention realizes the continuity of fibers in the helmet, the same layer number of each point of the helmet shell and uniform thickness, thereby realizing the minimum attenuation of the bulletproof performance, and avoiding the defect of unsustainable quality of manual layering; the problem of wrinkles among helmet shells is avoided, the notch structure process design is abandoned, the overall bulletproof performance of the bulletproof helmet can be obviously improved, the weight reduction and the prevention increase of the bulletproof helmet are realized, and the qualitative leap of the bulletproof effect brought by the traction process is further optimized by combining the staggering of the tensile force extension line angles and the mirror symmetry adjustment.
Description
Technical Field
The invention relates to the technical field of non-metal protection, in particular to a non-metal bulletproof helmet and a preparation device and a preparation method thereof.
Background
The shell of the nonmetal bulletproof helmet is mainly made by adopting high-strength and high-modulus fibers as basic raw materials, layering the fabric resin matrix prepreg in a form and then carrying out high-temperature mould pressing; high strength, high modulus fibers include, but are not limited to, aramid II, aramid III, ultra high molecular weight polyethylene, carbon fibers, polyimide fibers, PBO fibers, and the like; fabric structures include, but are not limited to, woven fabrics such as plain, square plain, twill, satin, and the like, and laid fabrics and the like; the prepreg resin comprises but is not limited to modified phenolic aldehyde, modified epoxy, polyurethane, polyolefin, acrylic acid and the like, and the forming process takes cutting, layering and molding as main process technical routes.
In the prior art, the preparation methods of the non-metal bulletproof helmet mainly include two methods:
(1) cutting the prepreg of the bulletproof material according to the shape and size of the required helmet, crossing, neatly overlapping and flatly paving, respectively using a hot-pressing die and a cold-pressing die, and manufacturing the helmet through a preforming process and a forming process.
The helmet prepared by the method is easy to generate a large amount of interlayer wrinkles, and the wrinkles not only affect the overall bulletproof performance of the helmet, but also cause the overall overweight of the helmet and increase the load of fighters.
(2) In order to overcome the problem of the wrinkles, the prior art provides a method for cutting a protective sheet prepreg into notch structures with different shapes, then laying the notch stacks with different shapes into the bulletproof helmet, and finally laying and hot-press forming.
According to the preparation method, each layer of prepreg is cut into petal, strip, star-shaped and other gap symmetrical shapes according to the shape and size of the helmet, so that interlayer wrinkles of the subsequent process are reduced, bulletproof fibers are inevitably required to be cut, areas which may generate wrinkles are removed in advance, the integrity of the fabric prepreg is damaged, and the bulletproof performance of the helmet is affected.
In addition, in order to ensure good protection performance in the gap area, a large amount of edge folding operation is required to be carried out at each gap, and the whole weight of the helmet is increased due to the multi-process overlapping structure.
Meanwhile, the whole consistency of the cut prepreg hemispherical laying layer is poor, the stability of the bulletproof performance of the helmet is further influenced, and the performance of the bulletproof helmet pressed by the high-strength and high-modulus fiber prepreg is far lower than the bulletproof performance of a laminated board with the same surface density and the same process parameters (the integral of each piece of fiber is damaged by cutting, so that the whole bulletproof effect is greatly reduced).
(3) In order to overcome the technical defects of the prior art and the prior art, a brand-new bulletproof helmet processing method is provided in the prior art, the fiber is treated by dipping, and the dipped fiber is laid on the surface of a helmet forming mold or the surface of a laid previous fiber layer according to a preset direction; and curing and forming the bulletproof helmet after the preset number of fiber layers are paved.
The winding and laying mode of the mode avoids the problems of cutting fibers and damaging integrity, ensures that the fibers in the helmet are not broken, but has very complicated fiber bundle laying process, relatively low production efficiency and unsuitability for industrialized popularization, and the fibers laid in multiple layers lack a structure bound mutually between layers, so that the whole stability of a pressed finished product structure is poor, and the consistency of the bulletproof performance is influenced.
The existing nonmetal bulletproof helmet is used as protective equipment, the continuous weight reduction and the lasting defense enhancement are the unchanged trend, the fiber performance, the resin and the process are main factors influencing the bulletproof performance, and the process is a necessary way for improving the bulletproof performance of the helmet by fully playing the high-strength and high-modulus fiber performance under the condition that the fiber performance and the resin cannot be greatly improved in a short time.
Disclosure of Invention
Aiming at the requirements of continuous weight reduction and prevention enhancement of the bulletproof helmet and the problems of insufficient exertion of high-strength fiber bulletproof performance and poor stability of the existing composite helmet preparation process, the invention provides a novel helmet preparation device based on the current performance situation of the existing high-strength and high-modulus fibers, and the bulletproof helmet meeting the requirement of optimizing the bulletproof performance is prepared by a special process method; the continuity of fibers in the helmet and the same layer number and uniform thickness of each point of the helmet shell are realized, so that the minimum attenuation of the bulletproof performance is realized.
A nonmetal bulletproof helmet and a preparation device and a preparation method thereof are provided, wherein:
a non-metallic ballistic helmet comprising: the helmet comprises a helmet shell, a helmet edge sealing ring, a coating and a suspension system;
the helmet shell is a main body of the bulletproof helmet, high-strength and high-modulus chemical fibers are used as basic raw materials, prepreg resin is used as a direct raw material, the high-strength and high-modulus chemical fibers and the prepreg resin are compounded into a sheet by coating, and the sheet is compounded after being pulled by tensile force;
as an illustration, the high strength, high modulus chemical fiber requires a denier in the range of: the breaking strength between 550dtex and 3360dtex is more than: 21.5cN/dtex, tensile modulus greater than: a fiber filament of 80 Gpa.
By way of illustration, the high strength, high modulus chemical fibers include, but are not limited to: aramid fiber II, aramid fiber III, ultra-high molecular weight polyethylene, carbon fiber, polyimide fiber or PBO fiber.
By way of illustration, the fabric structure of the high strength, high modulus chemical fibers includes, but is not limited to: plain, square plain, twill or satin woven or laid fabrics; the fabric surface density should be between 70 grams per square meter and 500 grams per square meter.
By way of illustration, the prepreg resin is an adhesive resin for interlayer bonding, including but not limited to: modified phenolic, modified epoxy, polyurethane, polyolefin or acrylic; the content of the prepreg resin is between: 10-30% (weight ratio of resin to the whole prepreg).
By way of illustration, the coating composition includes, but is not limited to: knife coating, dip coating or film transfer coating.
The coating is sprayed on the outer side of the helmet shell, and the suspension system is arranged on the inner side of the helmet shell; the helmet edge sealing ring is arranged along the periphery of the bottom of the helmet shell;
a device for making a non-metallic ballistic helmet comprising: the device comprises a press, a convex die, a concave die and a fixed clamp unit;
the press is used for driving the male die to complete pressing operation, and the female die is fixedly arranged; the fixed clamp unit is arranged between the male die and the female die; the fixing clamp unit comprises a plurality of groups of fixing clamp structures arranged in the horizontal direction; each group of fixing clamp structures comprises 4 groups of fixing clamps which are used for clamping four corners of a group of laminated sheets and applying a tensile force in a horizontal plane;
by way of illustration, the press is a down-press hydraulic press.
As an example, the plurality of sets of horizontally arranged fixing clamp structures is 3 sets.
Each group of fixing clamps is movably arranged, and the tensile force applied by the fixing clamps in one horizontal plane can be adjusted in the direction of the force in the same horizontal plane;
by way of illustration, each set of mounting clip structures may be 3 sets of mounting clips.
By way of illustration, each set of mounting clip structures may be 2 sets of mounting clips.
A method of making a non-metallic ballistic resistant helmet comprising:
step one, a cutting process;
cutting fabric prepreg of the coiled material into sheets;
by way of illustration, the sheet material is: one of square, circular, or elliptical.
As an illustration, the cutting refers to: and (3) determining the size of a sheet by using the fabric prepreg of the coiled material according to the size of the helmet, and performing cutting operation.
Step two, a lamination process;
the lamination refers to: the sheets are arranged in parallel among layers or laminated at different angles among the layers according to the horizontal direction;
by way of illustration, the stacking at different angles between the layers is: the warp threads of each layer of the sheet material rotate clockwise by an angle of 20 degrees according to the direction of the warp threads of the previous layer.
Step three, preheating;
the preheating refers to raising the temperature of the laminated sheet to a set temperature and softening the laminated sheet in a heating environment;
as an illustration, the set temperature is: 50-120 ℃, and the preheating time is as follows: 5-30 minutes;
step four, a traction process;
dividing the laminated sheets into a plurality of groups on average, wherein the number of the laminated sheets is the same as that of the fixing clamp structures; each group of fixing clamp structures correspondingly clamps the periphery of a group of laminated sheets through 4 groups of fixing clamps, and outwards stretches the laminated sheets by a force in a plane in a direction away from the center of the laminated sheets; by parity of reasoning, each group of fixing clamp structures is ensured to stretch one group of laminated sheets;
as an illustration, a group of laminated sheets are sandwiched around, the four sides being:
when the laminated sheet is square, four corners of the square are arranged on the periphery of the laminated sheet;
when the laminated sheet is rectangular, the periphery of the laminated sheet is four corners of a maximum internally tangent square by taking the center of the rectangle as a central point O;
when the laminated sheet is circular, four corners of a square which is internally tangent to the periphery are formed at the maximum by taking the center of a circle as a central point O;
when the laminated sheet is in an oval shape, the periphery of the laminated sheet is four corners of a square which is inscribed maximally and takes the center of the oval as a central point O;
further, from bottom to top:
the first layer of laminated sheet material ensures that extension lines of tension applied by the fixing clamps around the first layer of laminated sheet material are intersected on the central point O of the laminated sheet material D;
the extension lines of the tension applied by the fixing clamps on the periphery of the second laminated sheet material are ensured, the extension lines of the two groups of tension on the left side of the second laminated sheet material are intersected at a left side position A of a central point O of the laminated sheet material, the extension lines of the two groups of tension on the right side of the second laminated sheet material are intersected at a right side position B of the central point O of the laminated sheet material, the intersection point A on the left side and the intersection point B on the right side are in mirror symmetry relative to the central point O of the laminated sheet material, the distances between OA and OB are equal, and meanwhile, the points A, B and O are on the same straight line;
as an illustration, the left and right sides refer to: with reference to the vertical line at the center point O.
The third layer of laminated sheet material ensures the extension lines of the pulling forces applied by the fixing clamps on the periphery of the third layer of laminated sheet material, the extension lines of the two groups of pulling forces on the left side of the third layer of laminated sheet material are intersected at the right side position B of the center point O of the laminated sheet material, and the extension lines of the two groups of pulling forces on the right side of the third layer of laminated sheet material are intersected at the left side position A of the center point O of the laminated sheet material;
an nth layer of laminated sheets, which is repeatedly cycled in a second and third layer manner, and so on;
as an example of a principle, the reason for thus setting the angle of the extension of the tensile force exerted by the surrounding fixing clip is that:
when the first layer of tensile force extension lines are intersected on the center O of the laminated sheet, the position stress of the tensile force extension lines is the largest, the stretching length is the largest when hot pressing is carried out, and compared with other positions, the bulletproof effect is slightly lost;
the positions of the tensile extension lines of the second layer are staggered, so that the maximum tensile length area of the first layer is compensated while the uniform tensile force on the laminated sheet is ensured, and the slight loss of the overlarge tensile length of the first layer is compensated through staggered superposition;
the positions of the tension extension lines of the third layer are staggered, so that the tension on the laminated sheet is uniform, the maximum stretching length area of the second layer is compensated, and slight loss of the overlarge stretching length of the second layer is compensated through mirror image staggered equidistant superposition;
analogizing in proper order, recycling has effectively promoted the protective effect of whole bulletproof helmet, and the protective effect that fold and breach structure that has avoided traditional suppression to produce again is not enough, and weight gain is not enough.
As an example, in order to ensure a good tension effect, the clamping force, i.e. the release pressure, of each set of clamps must not be less than 500N.
Step five, hot pressing technology;
the hot pressing process comprises the following steps: setting the temperature of the convex die and the concave die to be 120-165 ℃, and performing die closing operation, namely pressing the laminated sheet subjected to the traction process into the concave die through the convex die for hot pressing, releasing all fixing clamps simultaneously after the die is closed, keeping the pressure at 15-25 Mpa for 10-30 minutes, and preparing a hot-pressed blank;
step six, a shaping process;
the shaping process comprises the following steps: and (3) in a shaping mold at the temperature of 40-60 ℃, carrying out re-pressing on the hot-pressed blank under the pressure of 15-25 Mpa for 1-10 minutes to obtain the helmet shell.
The invention has the beneficial effects that:
(1) the problem of poor consistency caused by manual layering preforming operation on finished helmet products is avoided, and the sustainable stability of quality is guaranteed.
(2) The problem of wrinkles between helmet shells is obviously solved, the overall bulletproof performance of the helmet is greatly improved, and the defect of overall weight gain of the helmet caused by excessive wrinkles is reduced.
(3) The technical design of the notch structure is abandoned, the overall bulletproof performance of the bulletproof helmet can be obviously improved, meanwhile, through the technical approach, the defect that the notch structure needs to be subjected to edge folding operation is reduced, the additional overlapping load caused by the edge folding is reduced, and the weight reduction and the prevention increase of the bulletproof helmet are also realized.
(4) The traction design concept is creatively introduced, and the qualitative leap of the bulletproof effect brought by the traction process is further optimized by combining the staggering of the extension line angle of the tensile force and the mirror symmetry adjustment.
Drawings
Fig. 1 is a perspective view showing the structure of a manufacturing apparatus of a non-metallic bulletproof helmet of the present invention.
Fig. 2 is a front view of the structure of a manufacturing apparatus of a non-metallic bulletproof helmet of the present invention.
Fig. 3 is a schematic view of a fixing clamp structure of a manufacturing apparatus of a non-metallic bulletproof helmet of the present invention.
Fig. 4 is a schematic view illustrating an example of a parallel arrangement of laminations of the lamination process of a method of making a non-metallic ballistic helmet of the present invention.
Fig. 5 is a schematic view illustrating an example of lamination at different angles between layers in a lamination process of a method for manufacturing a non-metallic bulletproof helmet according to the present invention.
Fig. 6 is an exemplary schematic diagram of four corners of a maximum inscribed square formed by taking the center of a circle as a center point O as the periphery when the laminated sheet is circular in the method for manufacturing the non-metallic bulletproof helmet of the present invention.
Fig. 7 is a schematic diagram of the intersection of tensile extension lines of the first laminated sheet in the drawing process of the method for manufacturing a non-metallic bulletproof helmet according to the present invention.
Fig. 8 is a schematic diagram of the intersection of extension lines of tensile forces of the second laminated sheets in the drawing process of the method for manufacturing a non-metallic bulletproof helmet of the present invention.
Fig. 9 is a schematic diagram of the intersection of extension lines of the tensile force of the third laminated sheet in the drawing process of the method for manufacturing the non-metallic bulletproof helmet of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 9, a non-metal bulletproof helmet and a manufacturing apparatus and a manufacturing method thereof are disclosed, wherein:
a non-metallic ballistic helmet comprising: the helmet comprises a helmet shell, a helmet edge sealing ring, a coating and a suspension system;
the helmet shell is a main body of the bulletproof helmet, high-strength and high-modulus chemical fibers are used as basic raw materials, prepreg resin is used as a direct raw material, the high-strength and high-modulus chemical fibers and the prepreg resin are compounded into a sheet by coating, and the sheet is compounded after being pulled by tensile force;
as an illustration, the high strength, high modulus chemical fiber requires a denier in the range of: the breaking strength between 550dtex and 3360dtex is more than: 21.5cN/dtex, tensile modulus greater than: a fiber filament of 80 Gpa.
By way of illustration, the high strength, high modulus chemical fibers include, but are not limited to: aramid fiber II, aramid fiber III, ultra-high molecular weight polyethylene, carbon fiber, polyimide fiber or PBO fiber.
By way of illustration, the fabric structure of the high strength, high modulus chemical fibers includes, but is not limited to: plain, square plain, twill or satin woven or laid fabrics; the fabric surface density should be between 70 grams per square meter and 500 grams per square meter.
By way of illustration, the prepreg resin is an adhesive resin for interlayer bonding, including but not limited to: modified phenolic, modified epoxy, polyurethane, polyolefin or acrylic; the content of the prepreg resin is between: 10-30% (weight ratio of resin to the whole prepreg).
By way of illustration, the coating composition includes, but is not limited to: knife coating, dip coating or film transfer coating.
The coating is sprayed on the outer side of the helmet shell, and the suspension system is arranged on the inner side of the helmet shell; the helmet edge sealing ring is arranged along the periphery of the bottom of the helmet shell;
a device for making a non-metallic ballistic helmet comprising: the device comprises a press 101, a male die 102, a female die 103 and a fixing clamp unit;
the press 101 is used for driving the male die 102 to complete pressing operation, and the female die 103 is fixedly arranged; the fixing clamp unit is arranged between the male die 102 and the female die 103; the fixing clamp unit comprises a plurality of groups of fixing clamp structures arranged in the horizontal direction; each set of fixing clamp structure comprises 4 sets of fixing clamps 104 for clamping four corners of a set of laminated sheets 105 and applying a tensile force in a horizontal plane;
by way of illustration, the press 101 is a down-press hydraulic press.
As an example, the plurality of sets of horizontally arranged fixing clamp structures are 3 sets.
Each group of fixing clamps 104 is movably arranged, and the direction of a tensile force applied in one horizontal plane can be adjusted in the same horizontal plane;
by way of illustration, each set of mounting clip structures may also be 3 sets of mounting clips 104.
By way of illustration, each set of mounting clip structures may also be 2 sets of mounting clips 104.
A method of making a non-metallic ballistic resistant helmet comprising:
step one, a cutting process;
cutting fabric prepreg of the coiled material into sheets;
by way of illustration, the sheet is: one of square, circular, or elliptical.
As an illustration, the cutting refers to: and (3) determining the size of a sheet by using the fabric prepreg of the coiled material according to the size of the helmet, and performing cutting operation.
Step two, a lamination process;
the lamination refers to: the sheets are horizontally arranged and laminated in parallel among layers 201 or laminated at different angles among layers 202;
by way of illustration, the stacking of layers 202 at different angles between layers is: the warp threads of each layer of sheet material rotate clockwise by an angle of 20 degrees according to the direction of the warp threads of the previous layer.
Step three, preheating;
the preheating refers to raising the temperature of the laminated sheet to a set temperature and softening the laminated sheet in a heating environment;
as an illustration, the set temperature is: 50-120 ℃, and the preheating time is as follows: 5-30 minutes;
step four, a traction process;
evenly dividing the laminated sheets into a plurality of groups, wherein the number of the groups is the same as that of the structures of the fixing clamp; each group of fixing clamp structures correspondingly clamps the periphery of a group of laminated sheets 105 through 4 groups of fixing clamps, and outwards stretches the laminated sheets by a force in a plane in the direction far away from the center of the laminated sheets; by analogy, each group of fixing clamp structures is ensured to stretch one group of laminated sheets 105;
as an illustration, a group of laminated sheets 105 is clamped around the perimeter of:
when the laminated sheet is square, four corners of the square are arranged on the periphery of the laminated sheet;
when the laminated sheet is rectangular, the periphery of the laminated sheet is four corners of a maximum internally tangent square by taking the center of the rectangle as a central point O;
when the laminated sheet is circular, the four sides are four corners of a square which is inscribed maximally by taking the center of a circle as a center point O, for example, as shown in fig. 6 in detail;
when the laminated sheet is in an oval shape, the periphery of the laminated sheet is four corners of a square which is inscribed maximally and takes the center of the oval as a central point O;
further, from bottom to top:
the first layer of laminated sheet material ensures that extension lines of tension applied by the fixing clamps around the first layer of laminated sheet material are intersected on the central point O of the laminated sheet material D;
the extension lines of the tension applied by the fixing clamps on the periphery of the second laminated sheet material are ensured, the extension lines of the two groups of tension on the left side of the second laminated sheet material are intersected at a left side position A of a central point O of the laminated sheet material, the extension lines of the two groups of tension on the right side of the second laminated sheet material are intersected at a right side position B of the central point O of the laminated sheet material, the intersection point A on the left side and the intersection point B on the right side are in mirror symmetry relative to the central point O of the laminated sheet material, the distances between OA and OB are equal, and meanwhile, the points A, B and O are on the same straight line;
as an illustration, the left and right sides refer to: with reference to the vertical line at the center point O.
The third layer of laminated sheet material ensures the extension lines of the pulling forces applied by the fixing clamps on the periphery of the third layer of laminated sheet material, the extension lines of the two groups of pulling forces on the left side of the third layer of laminated sheet material are intersected at the right side position B of the center point O of the laminated sheet material, and the extension lines of the two groups of pulling forces on the right side of the third layer of laminated sheet material are intersected at the left side position A of the center point O of the laminated sheet material;
an nth layer of laminated sheets, which is repeatedly cycled in a second and third layer manner, and so on;
as an example of a principle, the reason for thus setting the angle of the extension of the tensile force exerted by the surrounding fixing clip is that:
when the first layer of tension extension lines are intersected on the center O of the laminated sheet, the position of the tension extension line is stressed maximally, the stretching length is maximal when hot pressing is carried out, and compared with other positions, the bulletproof effect is slightly lost;
the positions of the tensile extension lines of the second layer are staggered, so that the maximum tensile length area of the first layer is compensated while the uniform tensile force on the laminated sheet is ensured, and the slight loss of the overlarge tensile length of the first layer is compensated through staggered superposition;
the positions of the tension extension lines of the third layer are staggered, so that the tension on the laminated sheet is uniform, the maximum stretching length area of the second layer is compensated, and slight loss of the overlarge stretching length of the second layer is compensated through mirror image staggered equidistant superposition;
analogize in proper order, repeated circulation has effectively promoted the protective effect of whole bulletproof helmet, has avoided the protective effect that fold and the breach structure that traditional suppression produced brought not enough again, and weight gain is not enough.
As an example, in order to ensure a good tension effect, the clamping force, i.e. the release pressure, of each set of clamps must not be less than 500N.
Step five, hot pressing technology;
the hot pressing process comprises the following steps: setting the temperature of the convex die and the concave die to be 120-165 ℃, and performing die closing operation, namely pressing the laminated sheet subjected to the traction process into the concave die through the convex die for hot pressing, releasing all fixing clamps simultaneously after the die is closed, keeping the pressure at 15-25 Mpa for 10-30 minutes, and preparing a hot-pressed blank;
step six, a sizing process;
the shaping process comprises the following steps: and (3) in a shaping mold at the temperature of 40-60 ℃, carrying out re-pressing on the hot-pressed blank under the pressure of 15-25 Mpa for 1-10 minutes to obtain the helmet shell.
The invention avoids the problem of poor consistency of finished helmet products caused by manual layering preforming operation, and ensures the sustainable stability of quality; the problem of wrinkles among helmet shells is solved, the overall bulletproof performance of the helmet is greatly improved, and the defect of overall weight gain of the helmet caused by excessive wrinkles is reduced; the technical design of the notch structure is abandoned, the overall bulletproof performance of the bulletproof helmet can be obviously improved, meanwhile, through the technical approach, the defect that the notch structure needs to be subjected to edge folding operation is reduced, the extra overlapping load caused by the edge folding is reduced, and the weight reduction and the prevention increase of the bulletproof helmet are also realized; the traction design concept is creatively introduced, and the qualitative leap of the bulletproof effect brought by the traction process is further optimized by combining the staggering of the extension line angle of the tensile force and the mirror symmetry adjustment.
The target range experiment proves that: the preparation method not only solves the problem that the sheet can be independently formed without a notch structure, but also greatly improves the bulletproof performance by directly preparing raw materials while reducing the weight of the helmet shell, and comprises two indexes of bullet mark height of a pistol bullet and V50 value of a breakage-proof piece, wherein the former is reduced, and the latter is increased.
The above embodiments are only preferred embodiments of the present invention, and it should be understood that the above embodiments are only for assisting understanding of the method and the core idea of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A non-metallic ballistic helmet, comprising: the helmet comprises a helmet shell, a helmet edge sealing ring, a coating and a suspension system;
the helmet shell is a main body of the bulletproof helmet, high-strength and high-modulus chemical fibers are used as basic raw materials, prepreg resin is used as a direct raw material, the high-strength and high-modulus chemical fibers and the prepreg resin are compounded into a sheet by coating, and the sheet is compounded after being pulled by tensile force; the coating is sprayed on the outer side of the helmet shell, and the suspension system is arranged on the inner side of the helmet shell; the helmet is arranged along the periphery of the bottom of the helmet shell along the sealing ring.
2. A non-metallic ballistic resistant helmet according to claim 1,
the high-strength and high-modulus chemical fiber requires the titer to be as follows: the breaking strength between 550dtex and 3360dtex is more than: 21.5cN/dtex, tensile modulus greater than: a fiber filament of 80 Gpa.
3. A non-metallic ballistic resistant helmet according to claim 1,
the high strength, high modulus chemical fiber comprises: one of aramid fiber II, aramid fiber III, ultra-high molecular weight polyethylene, carbon fiber, polyimide fiber or PBO fiber;
the fabric structure of the high-strength, high-modulus chemical fiber comprises: plain, square plain, twill or satin woven or laid fabrics; the fabric surface density needs to be between 70 and 500 grams per square meter.
4. A non-metallic ballistic resistant helmet according to claim 1,
the adhesive resin for interlayer bonding of the prepreg resin comprises: modified phenolic, modified epoxy, polyurethane, polyolefin or acrylic; the coating composition includes but is not limited to: blade coating, dip coating or film transfer coating, the content of the prepreg resin should be between: 10-30%, namely the weight ratio of the resin to the whole prepreg.
5. A device for making a non-metallic ballistic helmet, comprising: the device comprises a press, a convex die, a concave die and a fixed clamp unit;
the press is used for driving the male die to complete pressing operation, and the female die is fixedly arranged; the fixed clamp unit is arranged between the male die and the female die; the fixing clamp unit comprises a plurality of groups of fixing clamp structures arranged in the horizontal direction; each group of fixing clamp structures comprises 4 groups of fixing clamps which are used for clamping four corners of a group of laminated sheets and applying a tensile force in a horizontal plane;
each group of fixing clamps is movably arranged, and the tensile force applied in one horizontal plane can be adjusted in the direction of the force in the same horizontal plane.
6. The apparatus of claim 5, wherein the press is a hydraulic press.
7. The apparatus of claim 5, wherein the plurality of sets of horizontally disposed fastening clip structures are 3 sets.
8. A method of making a non-metallic ballistic helmet comprising:
step one, a cutting process;
cutting fabric prepreg of the coiled material into sheets;
step two, a lamination process;
the lamination refers to: the sheets are stacked in parallel among layers or at different angles among layers in the horizontal direction;
step three, preheating;
the preheating refers to raising the temperature of the laminated sheet to a set temperature and softening the laminated sheet in a heating environment;
step four, a traction process;
dividing the laminated sheets into a plurality of groups on average, wherein the number of the laminated sheets is the same as that of the fixing clamp structures; each group of fixing clamp structures correspondingly clamps the periphery of a group of laminated sheets through 4 groups of fixing clamps, and outwards stretches the laminated sheets by a force in a plane in a direction away from the center of the laminated sheets; by analogy, each group of fixing clamp structures is ensured to stretch one group of laminated sheets;
sandwiching a group of laminated sheets around:
when the laminated sheet is square, four corners of the square are arranged on the periphery of the laminated sheet;
when the laminated sheet is rectangular, the periphery of the laminated sheet is four corners of a maximum internally tangent square by taking the center of the rectangle as a central point O;
when the laminated sheet is circular, four corners of a square which is internally tangent to the periphery are formed at the maximum by taking the center of a circle as a central point O;
when the laminated sheet is in an oval shape, the periphery of the laminated sheet is four corners of a square which is inscribed maximally and takes the center of the oval as a central point O;
counting from bottom to top:
the first layer of laminated sheet material ensures that extension lines of tension applied by the fixing clamps around the first layer of laminated sheet material are intersected on the central point O of the laminated sheet material D;
the extension lines of the tension applied by the fixing clamps on the periphery of the second laminated sheet material are ensured, the extension lines of the two groups of tension on the left side of the second laminated sheet material are intersected at a left side position A of a central point O of the laminated sheet material, the extension lines of the two groups of tension on the right side of the second laminated sheet material are intersected at a right side position B of the central point O of the laminated sheet material, the intersection point A on the left side and the intersection point B on the right side are in mirror symmetry relative to the central point O of the laminated sheet material, the distances between OA and OB are equal, and meanwhile, the points A, B and O are on the same straight line;
the third layer of laminated sheet material ensures the extension lines of the pulling forces applied by the fixing clamps on the periphery of the third layer of laminated sheet material, the extension lines of the two groups of pulling forces on the left side of the third layer of laminated sheet material are intersected on the right side position B of the central point O of the laminated sheet material, and the extension lines of the two groups of pulling forces on the right side of the third layer of laminated sheet material are intersected on the left side position A of the central point O of the laminated sheet material;
an nth layer of laminated sheets, which is repeatedly cycled in a second and third layer manner, and so on;
step five, hot pressing technology;
the hot pressing process comprises the following steps: setting the temperature of the convex die and the concave die to be 120-165 ℃, performing die closing operation, namely pressing the laminated sheet subjected to the traction process into the concave die through the convex die, performing hot pressing, simultaneously releasing all fixing clamps after the die is closed, keeping the pressure at 15-25 Mpa for 10-30 minutes, and preparing a hot-pressed blank;
step six, a shaping process;
the shaping process comprises the following steps: and (3) in a shaping mould at 40-60 ℃, carrying out repressing on the hot-pressed blank under the pressure of 15-25 Mpa for 1-10 minutes to obtain the helmet shell.
9. The method of claim 8, wherein the stacking of layers at different angles is: the warp of each layer of sheet material rotates clockwise by an angle of 20 degrees according to the direction of the warp of the previous layer;
the set temperature is as follows: 50-120 ℃, and the preheating time is as follows: 5-30 minutes.
10. The method of claim 8 wherein the clamp force, i.e., the release pressure, of each set of clamps is not less than 500N.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211626051.6A CN115847866A (en) | 2022-12-15 | 2022-12-15 | Nonmetal bulletproof helmet and preparation device and preparation method thereof |
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| CN202211626051.6A CN115847866A (en) | 2022-12-15 | 2022-12-15 | Nonmetal bulletproof helmet and preparation device and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728939A (en) * | 2023-06-14 | 2023-09-12 | 河北安泰富源安全设备制造有限公司 | Construction process of head protection equipment for lamination pressing |
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- 2022-12-15 CN CN202211626051.6A patent/CN115847866A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728939A (en) * | 2023-06-14 | 2023-09-12 | 河北安泰富源安全设备制造有限公司 | Construction process of head protection equipment for lamination pressing |
| CN116728939B (en) * | 2023-06-14 | 2024-02-02 | 河北安泰富源安全设备制造有限公司 | Construction process of head protection equipment for lamination pressing |
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