A composite material multi-cavity shell integrated forming die structure and forming method

Abstract

The application discloses a kind of composite material multi-cavity shell integrated forming die structure and forming method, belong to composite material forming technical field.The application adopts split rigid mandrel combined die structure, including mutually matched upper die, lower die, radial adjusting clamping plate and fixed end positioning baffle, and multiple round rib mandrels are arranged in circle staggered with square rib mandrel.The application realizes accurate limiting of mandrel end portion by fixed end positioning baffle, provides radial fine adjustment allowance using the waist-shaped adjusting hole of radial adjusting clamping plate, and realizes automatic centering locking of multiple mandrels in die closing process by cooperating with the arc-shaped protrusion of upper die and lower die end portion.The application is matched with fine forming process of mold preheating, mandrel pre-paved reinforcement, low-temperature resin infiltration, staged exhaust pressurization curing and low-temperature controllable demolding.The application can realize high-precision integrated forming of multi-cavity composite material magazine, effectively improve product inner cavity size precision and mechanical uniformity, and is suitable for industrialized batch production of high-precision composite material magazine.

Description

Technical Field

[0001] This invention belongs to the technical field of multi-cavity shell molding molds and molding methods, and specifically relates to a composite material multi-cavity shell integrated molding mold structure and molding method. Background Technology

[0002] Composite material magazines, with their lightweight, high specific strength, corrosion resistance, and excellent fatigue resistance, are gradually replacing traditional metal magazines and are widely used in the field of light weapons and equipment, serving as the core load-bearing structural component of firearm feeding systems. Multi-cavity composite material magazines have multiple independent ballistic cavities inside, requiring extremely high precision in cavity dimensions, cylindricity, smoothness, and overall structural consistency, directly affecting the stability and reliability of firearm feeding.

[0003] Currently, the integrated molding technology for composite magazines has significant technical shortcomings. Existing molding solutions are mainly divided into two categories: integral elastic core mold molding and integral rigid core mold molding. While integral elastic core molds can solve the demolding problem, the elastic material is prone to elastic deformation under high temperature and high pressure molding conditions, making it difficult to guarantee the dimensional accuracy and consistency of the multi-course internal cavities. It is also difficult to form sharp edges and regular internal cavity structures, resulting in large product dispersion. On the other hand, although integral rigid core molds have high molding accuracy, after curing, the core mold and the composite material shell are tightly fitted, resulting in serious demolding jamming problems and making it impossible to achieve smooth demolding, thus lacking the feasibility of mass production. Summary of the Invention

[0004] The purpose of this invention is to provide a composite material multi-cavity shell integral molding mold structure and molding method to solve the technical problems of low molding accuracy, large multi-core shaft alignment deviation, difficult demolding, many pore defects, and poor product consistency of existing composite material multi-cavity magazines, thereby achieving high-precision molding of multi-ballistic inner cavities, defect-free curing, convenient demolding, and adaptability to mass industrial production.

[0005] To solve the above technical problems, the present invention provides a composite material multi-cavity shell integral molding mold structure, including an upper mold and a lower mold. The upper mold and the lower mold cooperate with each other to form an outer cavity, which is used to form the magazine body.

[0006] Multiple independent mandrels are arranged along the length of the outer cavity, and each mandrel is used to form the ballistic inner cavity corresponding to the magazine.

[0007] One end of the outer cavity is equipped with a radial adjustment plate, and the other end is equipped with a fixed end positioning baffle. The radial adjustment plate and the fixed end positioning baffle respectively limit the two ends of the multiple mandrels to achieve end positioning constraint of the mandrels.

[0008] Preferably, the upper mold has an upper mold slot at one end and an upper mold positioning slot at the other end.

[0009] Preferably, the lower mold has a lower mold locking groove at one end and a lower mold positioning groove at the other end; when the upper mold and the lower mold are closed, the upper mold locking groove and the lower mold locking groove simultaneously engage the radial adjustment plate; and the upper mold positioning groove and the lower mold positioning groove simultaneously engage the fixed end positioning baffle.

[0010] Preferably, both the radial adjustment plate and the fixed end positioning baffle are provided with a tapered assembly structure. The tapered assembly structure is locked with the corresponding lower mold slot and lower mold positioning slot to achieve detachable and precise assembly and positioning.

[0011] Preferably, the mandrel comes in two types: a round-edged mandrel and a square-edged mandrel.

[0012] Preferably, there are 12 mandrels in total, namely 6 round-edged mandrels and 6 square-edged mandrels; and the 6 round-edged mandrels and the 6 square-edged mandrels are arranged in a staggered circular pattern around the same central axis.

[0013] Preferably, the fixed end positioning baffle has 12 circular positioning holes, the diameter of which is 0.05mm larger than the outer diameter of the mandrel end, so as to achieve precise positioning of the mandrel end.

[0014] Preferably, the radial adjustment plate has 12 waist-shaped adjustment holes. The width of the waist-shaped adjustment holes is 0.05 mm larger than the outer diameter of the mandrel end, and the length of the waist-shaped holes is 1.5 times the outer diameter of the mandrel end, forming a quantitative radial fine-tuning gap.

[0015] Preferably, the upper mold and the lower mold are provided with 12 arc-shaped protrusions at the ends near the radial adjustment plate, each corresponding to one end of the mandrel; during the mold closing process, each arc-shaped protrusion fits against the corresponding end of the mandrel and applies a centripetal force pointing towards the center of the cavity, which, together with the radial fine adjustment allowance of the waist-shaped adjustment hole, realizes automatic radial alignment and locking positioning of all mandrels.

[0016] The present invention also provides a method for integral molding of a multi-cavity shell made of composite materials, comprising the following steps:

[0017] S1. Mold preheating treatment: Preheat the upper mold, lower mold, radial adjustment plate and fixed end positioning baffle to 40±5℃ to ensure uniform temperature of all parts of the mold and improve the prepreg laying adhesion and molding stability.

[0018] S2. Preparation of Split Mandrel Preforms: 2mm thick carbon fiber prepreg is evenly laid on the surfaces of 6 round-edged mandrels and 6 square-edged mandrels to form independent mandrel preforms; one end of each mandrel is inserted into the circular positioning hole of the fixed end positioning baffle to complete the fixing and limiting; 10mm long short-cut carbon fiber reinforcement material is filled into the intersecting gaps between adjacent round-edged and square-edged mandrels; after filling, the mandrel bundle consisting of 12 mandrels is wrapped with a whole sheet of prepreg to form an integrated magazine preform;

[0019] S3. Mold pre-assembly and alignment: The fixed end positioning baffle with the mandrel preform is snapped into the upper mold positioning groove and the lower mold positioning groove; the radial adjustment plate is pre-assembled into the upper mold positioning groove and the lower mold positioning groove, so that the other end of each mandrel extends into the waist-shaped adjustment hole of the radial adjustment plate, thus completing the overall mold positioning of the preform.

[0020] S4. Adaptive Mold Closure and Alignment Locking: The hot press drives the upper mold to slowly descend. During the mold closing process, the arc-shaped protrusions at the ends of the upper and lower molds successively fit the ends of each mandrel. With the help of the quantitative radial fine-tuning gap of the waist-shaped adjustment hole, a centripetal force pointing towards the center of the cavity is applied to all mandrels, so that the staggered round-edged mandrels and square-edged mandrels are synchronously radially fine-tuned to the standard design position, achieving precise alignment and positioning throughout the entire area; finally, the mold closing gap between the upper and lower molds is controlled to be stably maintained at 1mm.

[0021] S5. Low-temperature resin softening and impregnation: Keep the upper and lower molds locked together, raise the overall temperature of the mold to 70-90℃, and keep it at a constant temperature for 5-15 minutes to allow the prepreg resin to soften and flow fully, completely impregnate the short-cut carbon fiber reinforcement material in the mandrel gap, fill the micro-voids in the molding, and effectively eliminate molding pores and delamination defects.

[0022] S6. Staged pressure venting and curing: First, perform low-pressure venting treatment, apply 4-6MPa pressure to the upper mold, hold the pressure for 5-15s and then quickly release the pressure, repeat 1-3 times to completely remove the gas and excess resin inside the mold cavity; then gradually increase the pressure and temperature, raising the mold pressure to 8-12MPa and the temperature to 140-160℃, and hold the pressure at a constant temperature for 20-40 minutes to complete the overall curing and molding of the magazine body;

[0023] S7. Low-temperature controllable demolding: After curing, stop heating and wait for the upper and lower molds to cool naturally to below 60°C. Release the mold forming pressure, disassemble the radial adjustment plate and the fixed end positioning baffle in sequence, and pull out the round-edged mandrel and the square-edged mandrel one by one along the axial direction to finally obtain a high-precision, low-porosity one-piece composite magazine.

[0024] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include:

[0025] 1. The molding die of the present invention adopts multiple independent rigid split mandrels to replace the traditional integral elastic mandrel and integral rigid mandrel. It not only utilizes the high-precision molding advantage of rigid mandrels to ensure the dimensional accuracy, cylindricity and smoothness of multi-ballistic inner cavities and effectively molds complex ridge structures, but also completely solves the problem of integral rigid mandrel jamming during demolding through the split axial extraction structure, thus balancing molding accuracy and demolding convenience.

[0026] 2. The molding die of the present invention has a double-end positioning structure with a fixed end for precise positioning and a radial fine-tuning end for adaptive adjustment. Combined with the centripetal force guiding structure of the mold closing arc protrusion, it can automatically complete the synchronous and precise centering and locking of 12 staggered mandrels during the mold closing process, which completely solves the problems of multi-mandrel molding offset, misalignment and uneven gap, and greatly improves the consistency of the inner cavity size of multi-cavity magazine.

[0027] 3. The molding method of the present invention adopts a preform preparation method of split laying, gap short-cut fiber reinforcement and overall wrapping, which eliminates the weak connection interface of multi-core split splicing, ensures the continuity and mechanical uniformity of the overall structure of the magazine, and avoids local cracking and delamination problems.

[0028] 4. The molding method of the present invention adopts a refined process system of low-temperature resin pre-impregnation, graded pressurization and degassing, and gradient temperature curing, which can fully promote resin impregnation of fibers, completely remove gas from the mold cavity, significantly reduce product porosity, improve the density and mechanical property consistency of composite materials, and produce molded products without pores, dry spots, or delamination defects. Attached Figure Description

[0029] Figure 1 A first-view structural schematic diagram of the integrated composite magazine provided by the present invention;

[0030] Figure 2 A second-view structural schematic diagram of the integrated composite magazine provided by the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the composite material multi-cavity shell integral molding mold provided by the present invention;

[0032] Figure 4 This is a schematic diagram of the internal structure of the composite material multi-cavity shell integral molding mold provided by the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of the upper mold provided by the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the lower mold provided by the present invention;

[0035] Figure 7This is a schematic diagram of the installation of the radial adjustment plate and the fixed end positioning baffle provided by the present invention;

[0036] Figure 8 This is a schematic diagram of the structure of the rounded mandrel provided by the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of the square-edged mandrel provided by the present invention;

[0038] Figure 10 This is a schematic diagram of the structure of the fixed-end positioning baffle provided by the present invention;

[0039] Figure 11 This is a schematic diagram of the radial adjustment plate provided by the present invention;

[0040] Figure 12 This is a layout diagram of the mandrel during the molding process of this invention;

[0041] Figure 13 This is a diagram showing the filling of carbon fiber prepreg and chopped carbon fiber reinforcement during the molding process of this invention.

[0042] The meanings of the markings in the attached diagram are as follows:

[0043] In the diagram: 1. Upper mold; 2. Lower mold; 3. Mandrel; 301. Rounded mandrel; 302. Square mandrel; 4. Radial adjustment plate; 5. Fixed end positioning baffle; 6. Arc-shaped protrusion; 101. Upper mold slot; 102. Upper mold positioning slot; 201. Lower mold slot; 202. Lower mold positioning slot; 401. Waist-shaped adjustment hole; 501. Circular positioning hole; 100. Magazine body; 200. Ballistic cavity. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0045] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Example

[0048] This invention provides a composite material multi-cavity shell integral molding mold structure, please refer to [link / reference]. Figure 1-4 It includes an upper mold 1, a lower mold 2, 12 separate rigid mandrels 3, a radial adjustment plate 4, and a fixed end positioning baffle 5. The 12 mandrels include 6 rounded mandrels 301, such as... Figure 8 As shown; and 6 square-edged mandrels 302, as Figure 9 As shown; the magazine is arranged in an alternating circular pattern around the central axis, matching the multi-cavity magazine with a multi-trajectory inner cavity of 200.

[0049] Specifically, such as Figure 5-7 The upper mold 1 is provided with an upper mold locking groove 101 and an upper mold positioning groove 102 at both ends, and the lower mold 2 is provided with a lower mold locking groove 201 and a lower mold positioning groove 202 at both ends, respectively, and a radial adjustment plate 4 and a fixed end positioning baffle 5 are respectively installed. Both baffles are provided with a tapered assembly structure to achieve precise locking and positioning.

[0050] Furthermore, such as Figure 10 and Figure 11 As shown, the fixed end positioning baffle 5 has 12 circular positioning holes 501 with a diameter 0.05 mm larger than the end of the mandrel, so as to achieve precise positioning of one end of the mandrel; the radial adjustment plate 4 has 12 waist-shaped adjustment holes 401 with a hole width 0.05 mm larger than the end of the mandrel and a hole length 1.5 times the outer diameter of the end of the mandrel, so as to provide a quantitative radial fine adjustment gap.

[0051] In this embodiment, 12 sets of arc-shaped protrusions 6 are provided at the ends of the upper and lower molds respectively. During the mold closing process, each arc-shaped protrusion 6 fits against the end of the corresponding mandrel 3 and applies a centripetal force pointing towards the center of the cavity. With the radial fine adjustment allowance of the waist-shaped adjustment hole 401, the automatic radial alignment and locking positioning of all mandrels 3 are realized.

[0052] The present invention also provides a method for integral molding of a multi-cavity shell made of composite materials, comprising the following steps:

[0053] S1. Mold preheating treatment: Preheat the upper mold 1, lower mold 2, radial adjustment plate 4 and fixed end positioning baffle 5 to 40±5℃ to ensure uniform temperature of all parts of the mold and improve the prepreg laying adhesion and molding stability.

[0054] S2. Preparation of Split Mandrel Preforms: 2mm thick carbon fiber prepreg is evenly laid on the surfaces of 6 rounded mandrels 301 and 6 squared mandrels 302 respectively, forming independent mandrel preforms; For example... Figure 12 As shown, one end of each mandrel 3 is inserted into the circular positioning hole 501 of the fixed end positioning baffle 5 to complete the fixing and limiting; 10mm long short-cut carbon fiber reinforcement material is filled into the intersecting gaps between adjacent round-edged mandrels 301 and square-edged mandrels 302. After filling, the mandrel bundle composed of 12 mandrels 3 is completely wrapped with a whole sheet of prepreg to form an integrated magazine preform, as shown. Figure 13 As shown;

[0055] S3. Mold pre-assembly and alignment: The fixed end positioning baffle 5 with the mandrel 3 preform is snapped into the upper mold positioning groove 102 and the lower mold positioning groove 202; the radial adjustment plate 4 is pre-assembled into the upper mold positioning groove 101 and the lower mold positioning groove 201, so that the other end of each mandrel 3 extends into the waist-shaped adjustment hole 401 of the radial adjustment plate 4, thus completing the overall mold assembly and positioning of the preform.

[0056] S4. Adaptive Alignment and Locking of Mold Closure: The hot press drives the upper mold 1 to slowly descend. During the mold closing process, the arc-shaped protrusions 6 at the ends of the upper mold 1 and the lower mold 2 successively fit the ends of each mandrel 3. With the help of the quantitative radial fine-tuning gap of the waist-shaped adjustment hole 401, a centripetal force pointing towards the center of the cavity is applied to all mandrels 3, so that the staggered round-edged mandrels 301 and square-edged mandrels 302 are synchronously radially fine-tuned to the standard design position, achieving precise alignment and positioning throughout the entire area; finally, the mold closing gap between the upper mold 1 and the lower mold 2 is stably maintained at 1mm.

[0057] S5. Low-temperature resin softening and impregnation: Keep the upper mold 1 and lower mold 2 locked together, raise the overall temperature of the mold to 70-90℃, and keep it at a constant temperature for 5-15 minutes to allow the prepreg resin to soften and flow fully, completely impregnate the short-cut carbon fiber reinforcement material in the gap of the mandrel 3, fill the micro-voids in the molding, and effectively eliminate molding pores and delamination defects.

[0058] S6. Staged pressure venting and curing: First, perform low-pressure venting treatment, apply 4-6MPa pressure to the upper mold 1, hold the pressure for 5-15s and then quickly release the pressure, repeat 1-3 times to completely remove the gas and excess resin inside the mold cavity; then gradually increase the pressure and temperature, raise the mold pressure to 8-12MPa, and at the same time raise the temperature to 140-160℃, hold the pressure and temperature at a constant pressure for 20-40 minutes to complete the overall curing and molding of the magazine body 100;

[0059] S7. Low-temperature controllable demolding: After curing, stop heating and wait for the upper mold 1 and lower mold 2 to cool naturally to below 60°C. Release the mold forming pressure, and disassemble the radial adjustment plate 4 and the fixed end positioning baffle 5 in sequence. Pull out the round prism mandrel 301 and the square prism mandrel 302 one by one along the axial direction. Finally, a high-precision, low-porosity one-piece composite magazine is obtained.

[0060] Testing revealed that the magazine cavity formed in this embodiment has high dimensional accuracy, no porosity or delamination defects, uniform fiber impregnation, and excellent batch consistency, meeting the high precision and high reliability requirements of light weapons and suitable for industrial mass production.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite material multi-cavity shell integral molding mold structure, characterized in that, It includes an upper mold (1) and a lower mold (2). The upper mold (1) and the lower mold (2) cooperate with each other to form an outer cavity. The outer cavity is used to form the magazine body (100). Multiple independent mandrels (3) are arranged along the length direction inside the outer cavity, and each mandrel (3) is used to form the ballistic inner cavity (200) corresponding to the magazine. One end of the outer cavity is equipped with a radial adjustment plate (4), and the other end is equipped with a fixed end positioning baffle (5). The radial adjustment plate (4) and the fixed end positioning baffle (5) respectively limit the ends of the multiple mandrels (3) to achieve end positioning constraint of the mandrels (3).

2. The composite multi-cavity shell integral molding mold structure according to claim 1, characterized in that, The upper mold (1) has an upper mold slot (101) at one end and an upper mold positioning slot (102) at the other end.

3. The composite multi-cavity shell integral molding mold structure according to claim 2, characterized in that, The lower mold (2) has a lower mold slot (201) at one end and a lower mold positioning slot (202) at the other end; when the upper mold (1) and the lower mold (2) are closed, the upper mold slot (101) and the lower mold slot (201) simultaneously engage the radial adjustment plate (4); while the upper mold positioning slot (102) and the lower mold positioning slot (202) simultaneously engage the fixed end positioning baffle (5).

4. The composite multi-cavity shell integral molding mold structure according to claim 3, characterized in that, Both the radial adjustment plate (4) and the fixed end positioning baffle (5) are provided with tapered assembly structures. The tapered assembly structures are locked with the corresponding lower mold slot (201) and lower mold positioning slot (202) respectively to achieve detachable and precise assembly positioning.

5. The composite multi-cavity shell integral molding mold structure according to claim 1, characterized in that, There are two types of mandrels (3): round-edged mandrels (301) and square-edged mandrels (302).

6. The composite multi-cavity shell integral molding mold structure according to claim 5, characterized in that, There are 12 spindles (3), namely 6 rounded spindles (301) and 6 square spindles (302); and the 6 rounded spindles (301) and the 6 square spindles (302) are arranged in a staggered circular pattern around the same central axis.

7. The composite multi-cavity shell integral molding mold structure according to claim 6, characterized in that, The fixed end positioning baffle (5) has 12 circular positioning holes (501). The diameter of the circular positioning holes (501) is 0.05 mm larger than the outer diameter of the mandrel end, so as to achieve precise positioning of the mandrel end.

8. The composite multi-cavity shell integral molding mold structure according to claim 6, characterized in that, The radial adjustment plate (4) has 12 waist-shaped adjustment holes (401). The width of the waist-shaped adjustment hole (401) is 0.05 mm larger than the outer diameter of the mandrel end. The length of the waist-shaped hole is 1.5 times the outer diameter of the mandrel end, forming a quantitative radial fine-tuning gap.

9. The composite material multi-cavity shell integral molding mold structure according to claim 8, characterized in that, The upper mold (1) and the lower mold (2) are provided with 12 arc-shaped protrusions (6) that correspond one-to-one with the ends of the mandrels (3) at the ends of the radial adjustment plate (4). During the mold closing process, each arc-shaped protrusion (6) fits against the end of the corresponding mandrel (3) and applies a centripetal force pointing towards the center of the cavity. With the radial fine adjustment allowance of the waist-shaped adjustment hole (401), the automatic radial alignment and locking positioning of all mandrels (3) are achieved.

10. A method for integrally molding a multi-cavity shell of composite materials, characterized in that, Includes the following steps: S1. Mold preheating treatment: Preheat the upper mold (1), lower mold (2), radial adjustment plate (4) and fixed end positioning baffle (5) to 40±5℃ to ensure uniform temperature of all parts of the mold and improve the prepreg bonding and molding stability. S2. Preparation of split mandrel preforms: 2mm thick carbon fiber prepreg is evenly laid on the surfaces of 6 round-edged mandrels (301) and 6 square-edged mandrels (302) to form independent mandrel preforms; one end of each mandrel (3) is inserted into the circular positioning hole (501) of the fixed end positioning baffle (5) to complete the fixed positioning; 10mm long short-cut carbon fiber reinforcement material is filled into the intersecting gaps between adjacent round-edged mandrels (301) and square-edged mandrels (302). After filling, the entire mandrel bundle composed of 12 mandrels (3) is wrapped with a whole sheet of prepreg to form an integrated magazine preform. S3. Mold pre-assembly and alignment: The fixed end positioning baffle (5) of the preform with mandrel (3) is snapped into the upper mold positioning groove (102) and the lower mold positioning groove (202); the radial adjustment plate (4) is pre-assembled into the upper mold positioning groove (101) and the lower mold positioning groove (201), so that the other end of each mandrel (3) extends into the waist-shaped adjustment hole (401) of the radial adjustment plate (4) to complete the overall mold positioning of the preform; S4. Adaptive centering and locking of mold closing: The hot press drives the upper mold (1) to slowly descend. During the mold closing process, the arc-shaped protrusions (6) at the ends of the upper mold (1) and the lower mold (2) fit into the ends of each mandrel (3) one by one. With the help of the quantitative radial fine-tuning gap of the waist-shaped adjustment hole (401), a centripetal force pointing towards the center of the cavity is applied to all mandrels (3), so that the staggered round-edged mandrels (301) and square-edged mandrels (302) are synchronously radially fine-tuned to the standard design position, so as to achieve precise centering and positioning throughout the entire area; finally, the mold closing gap between the upper mold (1) and the lower mold (2) is stably maintained at 1mm. S5. Low temperature resin softening and impregnation: Keep the upper mold (1) and lower mold (2) locked together, raise the overall temperature of the mold to 70-90℃, keep it at a constant temperature for 5-15 minutes, so that the prepreg resin can soften and flow fully, completely impregnate the short carbon fiber reinforcement material in the gap of the mandrel (3), fill the micro gaps in the molding, and effectively eliminate molding pores and delamination defects. S6. Graded pressure venting and curing: First, perform low-pressure venting treatment, apply 4-6MPa pressure to the upper mold (1), hold the pressure for 5-15s and then quickly release the pressure, repeat 1-3 times to completely remove the gas and excess resin inside the mold cavity; then gradually increase the pressure and temperature, raise the mold pressure to 8-12MPa, and at the same time raise the temperature to 140-160℃, and keep the temperature and pressure constant for 20-40min to complete the overall curing and molding of the magazine body (100); S7. Low-temperature controllable demolding: After curing, stop heating and wait for the upper mold (1) and lower mold (2) to cool naturally to below 60°C. Release the mold forming pressure, disassemble the radial adjustment plate (4) and the fixed end positioning baffle (5) in sequence, and pull out the round prism mandrel (301) and square prism mandrel (302) one by one along the axial direction. Finally, a high-precision, low-porosity integrated composite magazine is obtained.

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