CN112902762A - Tail wing stable unshelling armor-piercing bullet holder and preparation method thereof - Google Patents
Tail wing stable unshelling armor-piercing bullet holder and preparation method thereof Download PDFInfo
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- CN112902762A CN112902762A CN202110259766.1A CN202110259766A CN112902762A CN 112902762 A CN112902762 A CN 112902762A CN 202110259766 A CN202110259766 A CN 202110259766A CN 112902762 A CN112902762 A CN 112902762A
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- carbon fiber
- tooth bud
- fiber prepreg
- tooth
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
- F42B12/04—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
- F42B10/02—Stabilising arrangements
- F42B10/04—Stabilising arrangements using fixed fins
- F42B10/06—Tail fins
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
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- Combustion & Propulsion (AREA)
- Fluid Mechanics (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Moulding By Coating Moulds (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an empennage stable unshelling armor-piercing bullet holder and a preparation method thereof, wherein the bullet holder is formed by combining 3 carbon fiber composite material clamping flaps with the angle of 120 degrees through a hoop, tooth buds of the bullet holder are formed by processing and combining a plurality of carbon fiber mould pressing plates with different layer laying angles and layer laying thicknesses, and an outer shell is formed by compression molding of short carbon fiber prepreg yarns; the preparation method comprises the steps of bullet holder design, tooth bud preforming, clamping flap forming and the like. The preparation method provided by the invention has simple process, and the prepared bullet holder has light weight and small inertia mass, and compared with the bullet holder made of metal materials, the bullet holder has higher initial speed and longer firing range under the same working condition; in addition, the tooth buds of the bullet holder are formed by continuous carbon fibers in advance, the tooth buds are high in strength and good in consistency, the bullet core can be better supported when the bullet holder is launched in a chamber, and the bullet holder has the advantage of being high in reliability.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a stable tail wing shelling armor piercing bullet holder and a preparation method thereof.
Background
The projectile support is an important component of a stable tail wing shelling armor-piercing projectile, most of the projectile supports used at present are saddle-shaped structures which are uniformly divided into three or four clamping flaps along the longitudinal axis of the projectile support, and when the armor-piercing projectile is launched, the three or four clamping flaps can well hold the projectile body tightly, so that the projectile body can obtain the optimal initial speed, support and guide the flight. After the bullet is taken out of the chamber, the bullet holder is under the resistance of the head-on airflow and the after-effect action of gunpowder gas, the combined valve is opened to be separated from the bullet body, and in the process, the tooth bud is the main bearing part.
The existing bullet holder material of unshelling armor-piercing bullet is metal material, light composite material etc. and metal material's bullet holder accounts for a great part negative weight, influences armor-piercing bullet's initial velocity and leads to certain influence to the projectile body flight. Although the weight of the bullet holder is greatly reduced by the prior bullet holder formed by adopting the light composite material, the fiber direction is messy during injection molding or compression molding, the strength of the formed tooth bud is low, and the tooth bud is easy to damage during discharging, thereby causing influence on the launching of the bullet.
Therefore, the unshelling armor-piercing bullet holder with light weight and high tooth bud strength is urgently needed.
Disclosure of Invention
The invention provides a stable tail wing shelling armor piercing bullet holder and a preparation method thereof, which are used for overcoming the defects of heavy weight, insufficient tooth bud strength and the like of the bullet holder in the prior art.
In order to achieve the purpose, the invention provides an empennage stable shelling armor piercing bullet holder which is formed by combining 3 carbon fiber composite material clamping flaps with 120 degrees through a hoop, wherein each clamping flap comprises a tooth bud and an outer shell, and the outer shell is coated on the outer surface of the tooth bud; the shell body is formed by compression molding of short carbon fiber prepreg yarns.
In order to achieve the above object, the present invention further provides a method for preparing the stable tail peeling armor-piercing projectile holder, which comprises:
s1: dividing the bullet support into a tooth bud and an outer shell according to the bullet support stress analysis result, and designing the layering angle and the layering thickness of the tooth bud;
according to the limitation of the process conditions, the tooth bud is divided into a plurality of sections along the axial direction of the tooth bud for preparation;
s2: selecting carbon fiber prepreg as a layering raw material of the tooth buds, preparing the carbon fiber prepreg according to the layering thickness of the tooth buds, layering the carbon fiber prepreg on a flat plate mould according to the layering angle and the layering thickness of the tooth buds, heating, pressurizing, curing, demoulding, and processing to obtain tooth bud-shaped blocks;
s3: repeating the step S2 to obtain a plurality of tooth bud-shaped blocks;
pretreating the tooth bud-shaped blocks, then coating epoxy resin adhesive glue on the adhesive surface of the tooth bud-shaped blocks, sequentially and correspondingly placing a plurality of tooth bud-shaped blocks on a mandrel of a lower die of a tooth bud die, closing an upper die and the lower die of the tooth bud die, and heating and curing to obtain preformed tooth buds;
s4: selecting short carbon fiber prepreg yarns as raw materials of a shell, putting a pre-processed preformed tooth bud into a lower die of a bullet holder forming die, weighing the short carbon fiber prepreg yarns, laying the short carbon fiber prepreg yarns on the outer surface of the preformed tooth bud and in a gap between an insert block and an upper die of the bullet holder forming die, closing the lower die and the upper die of the bullet holder forming die, heating, pressurizing and curing to obtain a 120-degree composite material clamping flap;
s5: repeating the steps S2-S4 three times to obtain 3 blocks of composite material clamping flaps with the angle of 120 degrees.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a stable tail wing unshelling armor-piercing bullet holder which is formed by combining 3 carbon fiber composite material clamping flaps with the angle of 120 degrees through a hoop, wherein tooth buds of the bullet holder are formed by processing and combining a plurality of carbon fiber mould pressing plates with different layer laying angles and layer laying thicknesses, and a shell is formed by carrying out mould pressing on short carbon fiber prepreg yarns. The bullet holder provided by the invention has light weight and small inertia mass, and compared with the bullet holder made of metal materials, under the same working condition, the ammunition has higher initial speed and longer firing range; in addition, the tooth buds of the bullet holder are formed by continuous carbon fibers in advance, the tooth buds are high in strength and good in consistency, the bullet core can be better supported when the bullet holder is launched in a chamber, and the bullet holder has the advantage of being high in reliability.
2. The method for preparing the stable tail wing unshelling armor-piercing projectile support comprises the steps of projectile support design, tooth bud preforming, cartridge flap forming and the like, the process is simple, the prepared projectile support is light in weight and small in inertia weight, and compared with the projectile support made of metal materials, the projectile support is higher in initial velocity and longer in firing range under the same working condition; in addition, the tooth buds of the bullet holder are formed by continuous carbon fibers in advance, the tooth buds are high in strength and good in consistency, the bullet core can be better supported when the bullet holder is launched in a chamber, and the bullet holder has the advantage of being high in reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a structural diagram of a stable tail-fin shelling armor-piercing projectile holder provided by the invention;
FIG. 2 is a view showing the structure of a preformed tooth bud according to the present invention;
FIG. 3 is an assembly view of the upper mold of the tooth bud mold in example 1;
FIG. 4 is an assembly view of a lower die of a tooth bud mold in example 1;
FIG. 5 is an assembled view of an upper mold of the spring retainer molding die in example 1;
FIG. 6 is a structural view of a lower die of the spring support molding die in example 1;
fig. 7 is a structural view of an insert in the spring bearing molding die in example 1.
The reference numbers illustrate: 1: an outer housing; 2: tooth bud; 3: a jacking block; 4: an upper mold of the tooth bud mold; 5: a lower die of the tooth bud die; 6: a mandrel; 7: the mandrel fixes the supporting piece; 8: a compression block; 9: a left insert; 10: a middle embedded block; 11: a right insert block; 12: and the elastic support forming die is provided with an upper die.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The drugs/reagents used are all commercially available without specific mention.
The invention provides an empennage stable shelling armor piercing bullet holder which is formed by combining 3 carbon fiber composite material clamping flaps with the angle of 120 degrees through a hoop, wherein each clamping flap comprises a tooth bud and an outer shell, and the outer shell is coated on the outer surface of the tooth bud; the shell body is formed by compression molding of short carbon fiber prepreg yarns.
The invention also provides a preparation method of the stable tail wing shelling armor-piercing projectile support, which comprises the following steps:
s1: dividing the bullet support into a tooth bud and an outer shell according to the bullet support stress analysis result, and designing the layering angle and the layering thickness of the tooth bud;
according to the limitation of the process conditions, the tooth bud is divided into a plurality of sections along the axial direction of the tooth bud for preparation;
s2: selecting carbon fiber prepreg as a layering raw material of the tooth buds, preparing the carbon fiber prepreg according to the layering thickness of the tooth buds, layering the carbon fiber prepreg (the mass content of resin is 25-35%) on a flat plate mould according to the layering angle and the layering thickness of the tooth buds, heating, pressurizing, curing, demoulding, and processing to obtain a tooth bud-shaped block;
s3: repeating the step S2 to obtain a plurality of tooth bud-shaped blocks;
pretreating the tooth bud-shaped blocks, then coating epoxy resin adhesive glue on the adhesive surface of the tooth bud-shaped blocks, sequentially and correspondingly placing a plurality of tooth bud-shaped blocks on a mandrel of a lower die of a tooth bud die, closing an upper die and the lower die of the tooth bud die, and heating and curing to obtain preformed tooth buds;
s4: selecting short-cut carbon fiber prepreg yarns as raw materials of a shell, putting a pre-processed preformed tooth bud into a lower die of a bullet holder forming die, weighing the short-cut carbon fiber prepreg yarns (the mass content of resin is 25-35%) and paving the short-cut carbon fiber prepreg yarns on the outer surface of the preformed tooth bud and in a gap between an insert block and an upper die of the bullet holder forming die, closing the lower die and the upper die of the bullet holder forming die, heating, pressurizing and curing to obtain a 120-degree composite material clamping flap;
s5: repeating the steps S2-S4 three times to obtain 3 blocks of composite material clamping flaps with the angle of 120 degrees.
Preferably, in step S2, the carbon fiber prepreg is one of a T700 carbon fiber prepreg, a T800 carbon fiber prepreg, a T1000 carbon fiber prepreg, an M30 carbon fiber prepreg, and an M40 carbon fiber prepreg.
In step S4, the chopped carbon fiber prepreg yarn is one of a T700 carbon fiber prepreg yarn, a T800 carbon fiber prepreg yarn, a T1000 carbon fiber prepreg yarn, an M30 carbon fiber prepreg yarn, and an M40 carbon fiber prepreg yarn; the length of the short carbon fiber prepreg yarn is 20-30 mm.
The tooth bud is mainly used for bearing acting force when the tooth bud is taken out of the chamber, and the required strength is high, so that continuous carbon fiber cloth is used as a raw material, and meanwhile, the carbon fiber cloth is combined with a layer laying process (a layer laying angle and a layer laying thickness) to improve the strength of the tooth bud.
The acting force of the outer shell body which needs to bear is small, so the chopped carbon fiber is selected.
Preferably, the ply angle is at least one of 0 °, ± 10 °, ± 30 °, ± 45 ° and ± 90 °.
Preferably, the prepregs of the carbon fiber prepreg cloth and the chopped carbon fiber prepreg yarns in the steps S2 to S4 are resins, and the resins are epoxy resins or phenolic resins.
Preferably, the epoxy adhesive glue includes: 85-110 parts by mass of epoxy resin, 70-85 parts by mass of curing agent and 0.8-1.2 parts by mass of accelerator.
Preferably, the curing agent is an ester cyclic anhydride curing agent which is methyl tetrahydrophthalic anhydride (MNA);
the accelerant is 2,4, 6-tri (dimethylaminomethyl) phenol or N, N-dimethylbenzylamine. Preferably, in steps S2 and S4, the specific procedures of the heat-pressure curing are as follows:
heating from room temperature to 120 ℃ at the speed of 1-1.5 ℃/min, preserving heat at 120 ℃ for 1h, and then pressurizing to 5-10 MPa;
heating from 120 ℃ to 140 ℃ at the speed of 1-1.5 ℃/min, preserving heat at 140 ℃ for 1.5h, and then pressurizing to 10-15 MPa;
heating from 140 ℃ to 160 ℃ at the speed of 1-1.5 ℃/min, and preserving heat for 3h at 160 ℃.
Preferably, in step S2, the carbon fiber cloth prepreg includes a carbon fiber plain cloth/epoxy resin prepreg and a carbon fiber unidirectional/epoxy resin prepreg, and the thickness ratio of the carbon fiber plain cloth/epoxy resin prepreg to the carbon fiber unidirectional/epoxy resin prepreg is 5: 1; the thickness of the carbon fiber prepreg is 0.2-0.5 mm;
in step S4, the pre-processing of the preformed tooth bud specifically includes:
wiping the surface of the preformed tooth bud with a volatile solvent, and drying in an oven at 60 ℃ for 2h to remove surface impurities.
Preferably, in step S3, the tooth bud shaped block is preprocessed, specifically:
polishing the tooth bud-shaped blocks roughly by using 80-240-mesh abrasive paper, wiping the tooth bud-shaped blocks clean by using a volatile solvent, and drying the tooth bud-shaped blocks in an oven at 60 ℃ for 2-4 hours;
the heating and curing specifically comprises the following steps:
heating from room temperature to 120 ℃ at the speed of 1-1.5 ℃/min, and preserving heat at 120 ℃ for 1 h;
heating from 120 ℃ to 140 ℃ at the speed of 1-1.5 ℃/min, and preserving heat for 1.5h at 140 ℃;
heating from 140 ℃ to 160 ℃ at the speed of 1-1.5 ℃/min, and preserving heat for 3h at 160 ℃.
Example 1
The invention provides an empennage stable shelling armor piercing bullet holder which is formed by combining 3 carbon fiber composite material clamping flaps with 120 degrees through a hoop, wherein each clamping flap comprises a tooth bud 2 and an outer shell 1 (shown in figures 1 and 2), the outer shell 1 is coated on the outer surface of the tooth bud 2, and the tooth bud 2 is formed by processing and combining a plurality of carbon fiber mould pressing plates with different layer laying angles and layer laying thicknesses; the outer shell 1 is molded from chopped carbon fiber prepreg yarns.
The invention also provides a preparation method of the stable tail wing shelling armor piercing bullet holder, which comprises the following steps:
s1: dividing the bullet support into a tooth bud and an outer shell according to the bullet support stress analysis result, and designing the layering angle and the layering thickness of the tooth bud;
the tooth bud is divided into 3 sections along the axial direction according to the limitation of the process conditions, and the tooth bud is prepared separately.
S2: the upper and lower dies of the tooth bud die are shown in fig. 3 and 4. Cleaning the surfaces of an upper die and a lower die of a tooth bud die, coating a high-efficiency release agent for 3-5 times (each time interval is 10-15 min), selecting carbon fiber prepreg cloth as a reinforcing material of the tooth bud, preparing the carbon fiber prepreg cloth (T800) according to the layering thickness of the tooth bud, and layering the carbon fiber prepreg cloth on a flat die according to the layering angle and the layering thickness of the tooth bud; wherein the carbon fiber prepreg comprises carbon fiber plain weave/epoxyResin prepreg (gram weight 240 g/m)2Resin content 30%) and carbon fiber unidirectional/epoxy resin prepreg (gram weight 200 g/m)2Resin content of 30%), the thickness ratio of the carbon fiber plain weave/epoxy resin prepreg cloth to the carbon fiber unidirectional/epoxy resin prepreg cloth is 5: 1; the ply angle is 0 ° (90 °), 0 ° (90 °), 0 ° (90 °), +10 °, -10 °, 0 ° (90 °), 0 ° (90 °), and 0 ° (90 °), in this order. Compacting the interlayer by a roller to remove bubbles; closing the upper die and the lower die, putting the upper die and the lower die into a press, heating, pressurizing and curing, and performing compression molding to obtain a thickness of 50 mm; the specific procedures of heating and pressurizing curing are as follows:
heating from room temperature to 120 ℃ at the speed of 1.2 ℃/min, preserving heat at 120 ℃ for 1h, and then pressurizing to 7 MPa; heating from 120 ℃ to 140 ℃ at the speed of 1.2 ℃/min, preserving the heat at 140 ℃ for 1.5h, and then pressurizing to 12 MPa; the temperature was raised from 140 ℃ to 160 ℃ at a rate of 1.2 ℃/min and held at 160 ℃ for 3 h.
Naturally cooling to below 50 ℃, taking out, demolding and mechanically processing to obtain tooth bud-shaped blocks;
s3: repeating the step S2 to obtain a plurality of tooth bud-shaped blocks;
coating the inner surfaces of contact surfaces of a lower tooth bud mold 5, a mandrel 6, a mandrel fixing support 7, a pressing block 8, a jacking block 3, an upper tooth bud mold 4 and the like with an efficient mold release agent for 3-5 times, wherein the coating time interval is 10-15 min each time; assembling a mandrel 6 and a mandrel fixing support 7 with the lower tooth bud mold die 5 through screws (shown in figure 4); grinding the tooth bud-shaped blocks roughly by using 240-mesh abrasive paper, wiping the tooth bud-shaped blocks clean by using a volatile solvent (one of alcohol, ethyl acetate, acetone and the like), putting the tooth bud-shaped blocks into an oven to be dried for 3 hours at the temperature of 60 ℃, then coating epoxy resin adhesive on the adhesive surfaces of the tooth bud-shaped blocks, sequentially and correspondingly putting a plurality of tooth bud-shaped blocks on a mandrel 6 of a lower die 5 of a tooth bud die, putting a pressing block 8, putting an upper die 4 of the tooth bud die in alignment with a screw hole, screwing down screws, and enabling the die joint to be less than or equal to 0.03 mm; screw up the screw from the side and drive tight piece 3 and push up tight tooth bud shape piece, put into curing oven heating curing wholly, specifically do:
heating from room temperature to 120 ℃ at the speed of 1 ℃/min, and preserving heat for 1h at 120 ℃; heating from 120 ℃ to 140 ℃ at the speed of 1.3 ℃/min, and preserving the heat for 1.5h at 140 ℃; the temperature was raised from 140 ℃ to 160 ℃ at a rate of 1.5 ℃/min and held at 160 ℃ for 3 h.
And sequentially removing the parts such as the screws and the like, removing the preformed tooth buds (as shown in figure 2), cleaning burrs after demoulding, and polishing or milling out the irregular grooves on the outer arc surface of the preformed tooth buds by using 80-240-mesh sand paper.
S4: wiping the surface of the preformed tooth bud with volatile solvent (one of alcohol, ethyl acetate, acetone, etc.), and oven drying at 60 deg.C for 2 hr.
Coating the molding surfaces of the insert (comprising a left insert 9, a middle insert 10 and a right insert 11, as shown in figure 7), an upper mold 12 of a spring support molding mold, a lower mold of the spring support molding mold and the like with an efficient mold release agent for 3-5 times (the time interval of each coating is 10-15 min); the matching surface of the insert and the upper die of the bullet holder forming die, the surface of the bolt and the fixing pin are coated with high-temperature silicone grease, and the left insert 9, the middle insert 10, the right insert 11 and the upper die 12 of the bullet holder forming die are fixed by the bolt and the pin according to the specified positions, as shown in fig. 5.
Selecting short carbon fiber prepreg yarns as a reinforcing material of a shell, putting a pre-processed preformed tooth bud into a lower die (shown in figure 6) of a bullet holder forming die, weighing the short carbon fiber prepreg yarns (the length of the short carbon fiber prepreg yarns is 20-30 mm, T800) and laying the short carbon fiber prepreg yarns on the outer surface of the preformed tooth bud and in the gap between an insert block and an upper die of the bullet holder forming die, closing the upper die and the lower die by a positioning pin and a screw, wherein the closing gap is less than or equal to 0.03mm, detaching the screw, putting the die on a press, and heating, pressurizing and integrally curing, wherein the specific procedures are as follows: heating from room temperature to 120 ℃ at the speed of 1 ℃/min, preserving heat at 120 ℃ for 1h, and then pressurizing to 5 MPa; heating from 120 ℃ to 140 ℃ at the speed of 1.5 ℃/min, preserving the heat at 140 ℃ for 1.5h, and then pressurizing to 15 MPa; the temperature was raised from 140 ℃ to 160 ℃ at a rate of 1.4 ℃/min and held at 160 ℃ for 3 h.
Naturally cooling to below 50 ℃, taking out and demoulding, wherein the demoulding process comprises the following steps: the positioning pins of the upper die and the lower die of the bullet holder forming die are taken out, the upper die and the lower die of the bullet holder forming die are ejected by bolts, a product is left on the upper die of the bullet holder forming die, the left insert 9, the middle insert 10, the right insert 11 and the fixing bolts and pins of the upper die of the bullet holder forming die are taken out, the three inserts and the bullet holder are ejected by the bolts, the bullet holder is separated from the upper die 12 of the bullet holder forming die, and the three inserts are sequentially screwed out of the product to obtain 120-degree composite material clamping flaps.
S5: repeating the steps S2-S4 three times to obtain 3 blocks of composite material clamping flaps with the angle of 120 degrees.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The stable unshelling armor-piercing bullet holder for the empennage is formed by combining 3 carbon fiber composite material clamping flaps with the angle of 120 degrees through a hoop, each clamping flap comprises a tooth bud and an outer shell, and the outer shell is coated on the outer surface of the tooth bud; the shell body is formed by compression molding of short carbon fiber prepreg yarns.
2. A method of making a tail stabilized peel armour piercing projectile as claimed in claim 1, comprising:
s1: dividing the bullet support into a tooth bud and an outer shell according to the bullet support stress analysis result, and designing the layering angle and the layering thickness of the tooth bud;
according to the limitation of the process conditions, the tooth bud is divided into a plurality of sections along the axial direction of the tooth bud for preparation;
s2: selecting carbon fiber prepreg as a layering raw material of the tooth buds, preparing the carbon fiber prepreg according to the layering thickness of the tooth buds, layering the carbon fiber prepreg on a flat plate mould according to the layering angle and the layering thickness of the tooth buds, heating, pressurizing, curing, demoulding, and processing to obtain tooth bud-shaped blocks;
s3: repeating the step S2 to obtain a plurality of tooth bud-shaped blocks;
pretreating the tooth bud-shaped blocks, then coating epoxy resin adhesive glue on the adhesive surface of the tooth bud-shaped blocks, sequentially and correspondingly placing a plurality of tooth bud-shaped blocks on a mandrel of a lower die of a tooth bud die, closing an upper die and the lower die of the tooth bud die, and heating and curing to obtain preformed tooth buds;
s4: selecting short carbon fiber prepreg yarns as raw materials of a shell, putting a pre-processed preformed tooth bud into a lower die of a bullet holder forming die, weighing the short carbon fiber prepreg yarns, laying the short carbon fiber prepreg yarns on the outer surface of the preformed tooth bud and in a gap between an insert block and an upper die of the bullet holder forming die, closing the lower die and the upper die of the bullet holder forming die, heating, pressurizing and curing to obtain a 120-degree composite material clamping flap;
s5: repeating the steps S2-S4 three times to obtain 3 blocks of composite material clamping flaps with the angle of 120 degrees.
3. The method according to claim 2, wherein in step S2, the carbon fiber prepreg is one of a T700 carbon fiber prepreg, a T800 carbon fiber prepreg, a T1000 carbon fiber prepreg, an M30 carbon fiber prepreg, and an M40 carbon fiber prepreg;
in step S4, the chopped carbon fiber prepreg yarn is one of a T700 carbon fiber prepreg yarn, a T800 carbon fiber prepreg yarn, a T1000 carbon fiber prepreg yarn, an M30 carbon fiber prepreg yarn, and an M40 carbon fiber prepreg yarn; the length of the short carbon fiber prepreg yarn is 20-30 mm.
4. The method of claim 2, wherein the ply angle is at least one of 0 °, ± 10 °, ± 30 °, ± 45 ° and ± 90 °.
5. The method according to claim 2, wherein the prepregs of the carbon fiber prepreg cloth and the chopped carbon fiber prepreg yarn in steps S2 to S4 are resins, and the resins are epoxy resins or phenolic resins.
6. The method of claim 2, wherein the epoxy adhesive glue comprises: 85-110 parts by mass of epoxy resin, 70-85 parts by mass of curing agent and 0.8-1.2 parts by mass of accelerator.
7. The method of claim 6, wherein the curing agent is an ester cyclic anhydride curing agent which is methyl tetrahydrophthalic anhydride;
the accelerant is 2,4, 6-tri (dimethylaminomethyl) phenol or N, N-dimethylbenzylamine.
8. The method of claim 2, wherein the specific procedures of the heat-pressure curing in steps S2 and S4 are as follows:
heating from room temperature to 120 ℃ at the speed of 1-1.5 ℃/min, preserving heat at 120 ℃ for 1h, and then pressurizing to 5-10 MPa;
heating from 120 ℃ to 140 ℃ at the speed of 1-1.5 ℃/min, preserving heat at 140 ℃ for 1.5h, and then pressurizing to 10-15 MPa;
heating from 140 ℃ to 160 ℃ at the speed of 1-1.5 ℃/min, and preserving heat for 3h at 160 ℃.
9. The production method according to claim 2 or 8, wherein in step S2, the carbon fiber prepreg includes a carbon fiber plain weave/epoxy resin prepreg and a carbon fiber unidirectional/epoxy resin prepreg, and a thickness ratio of the carbon fiber plain weave/epoxy resin prepreg and the carbon fiber unidirectional/epoxy resin prepreg is 5: 1;
in step S4, the pre-processing of the preformed tooth bud specifically includes:
wiping the surface of the preformed tooth bud with a volatile solvent, and drying in an oven at 60 ℃ for 2 h.
10. The method according to claim 2, wherein in step S3, the tooth bud shaped pieces are pre-treated, specifically:
polishing the tooth bud-shaped blocks roughly by using 80-240-mesh abrasive paper, wiping the tooth bud-shaped blocks clean by using a volatile solvent, and drying the tooth bud-shaped blocks in an oven at 60 ℃ for 2-4 hours;
the heating and curing specifically comprises the following steps:
heating from room temperature to 120 ℃ at the speed of 1-1.5 ℃/min, and preserving heat at 120 ℃ for 1 h;
heating from 120 ℃ to 140 ℃ at the speed of 1-1.5 ℃/min, and preserving heat for 1.5h at 140 ℃;
heating from 140 ℃ to 160 ℃ at the speed of 1-1.5 ℃/min, and preserving heat for 3h at 160 ℃.
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