CN217671214U - RTM (resin transfer molding) mold capable of preparing ultrahigh-fiber-content 3D (three-dimensional) woven bulletproof composite material - Google Patents

Abstract

The utility model discloses a RTM mould which can prepare 3D woven bulletproof composite material with ultra-high fiber content, and consists of a piston block, an adhesive tape pressing plate, a frame, a bottom plate and a limiting block; the piston block is embedded in the frame, and the size of the die cavity can be adjusted through up-and-down movement; the adhesive tape pressing plate is locked with the frame through screws, so that the sealing strip is pressed tightly; the frame is of an integrated structure, and the upper surface and the lower surface of the frame are respectively provided with a groove for additionally arranging a sealing strip; the bottom plate is provided with a feeding hole and a discharging hole, and the bottom plate and the frame are locked by bolts; the height of the limiting blocks is designed according to the thickness of the composite material, and different thicknesses correspond to different heights of the limiting blocks. The utility model discloses a mould system of adjustable die cavity size, maneuverability is strong, can realize the accurate control of combined material thickness, and control range can reach 2-6mm to 65% -90% super high fiber content 3D machine weaving RTM combined material can be prepared, the problem of high fiber volume content 3D machine weaving bulletproof combined material RTM shaping difficulty has been solved.

Description

RTM (resin transfer molding) mold capable of preparing ultrahigh-fiber-content 3D (three-dimensional) woven bulletproof composite material

Technical Field

The utility model relates to a combined material preparation, mechanical design processing field, concretely relates to can prepare shellproof combined material's of super high fiber content 3D machine RTM mould can be used for preparing the shellproof combined material of the 3D machine weaving prefabricated part reinforcing of super high fiber volume content RTM, provides the preparation technique for the application of high fiber content 3D machine weaving combined material in shellproof field.

Background

Unlike decomposition energy type materials such as metals, ceramics, etc., the ballistic composite is an energy absorbing type material. When the high-performance fiber-reinforced bulletproof composite material is impacted by external high speed such as bullets or fragments, the high-performance fiber-reinforced bulletproof composite material can be deformed and damaged by the material, and the energy of the bullets or fragments is dissipated, so that the secondary damage of the bullets or fragments to a human body is reduced. Because the mechanical property of the high-performance fiber is far higher than that of the resin matrix, the bulletproof composite material puts high requirements on the fiber content. However, 3D prefabricated bodies, particularly 3D woven prefabricated bodies, have larger difference of fiber volume content than UD and 2D materials with the same warp and weft density due to the special structure of the prefabricated bodies.

In the preparation process of the RTM composite material, if the fiber volume content of a preform is too high, adverse effects can be caused on glue injection, on one hand, insufficient glue injection can be caused, on the other hand, the glue injection time can be prolonged, and the production efficiency is greatly reduced; if the fiber volume content is too low, the composite material has too high weight and poor mechanical properties.

In the preparation process of the RTM composite material, the higher the glue injection pressure is, the higher the requirement on the sealing performance of the die is. The sealing of the mould is not high, local air leakage is possible, a resin channel is formed, partial areas are rich in resin, partial areas have dry spots, and the performance of the composite material is greatly reduced.

The precision of the composite material preparation comprises the size parameters of the product, the fiber content of the product and the like. Due to temperature change and chemical change in the preparation process of the composite material, the material can be subjected to stretching deformation in different degrees, so that actual products and design parameters come in and go out, the precision of products needs to be improved, and the parameters of the products are accurately controlled.

SUMMERY OF THE UTILITY MODEL

To in the shellproof combined material of current 3D machine weaving, the problem that fibre volume content is low, production efficiency low scheduling problem, the utility model aims to solve the problem that exists among the above-mentioned technique to a RTM mould that can prepare the shellproof combined material of super high fiber content 3D machine weaving is proposed. The die is convenient to operate, and can realize the preparation of the 3D woven composite material with the fiber volume content of 65-90%.

In order to achieve the above purpose, the utility model provides a technical scheme does: a RTM (resin transfer molding) mold capable of preparing a 3D (three-dimensional) woven bulletproof composite material with ultrahigh fiber content is characterized in that a hot-pressing table of 100-500 tons comprises a piston block, an adhesive tape pressing plate, a frame, a bottom plate and a limiting block, and a mold cavity size regulating module consists of the piston block and the limiting block.

Furthermore, the piston block, the frame and the bottom plate are matched in size, the piston block is embedded in the frame, and the raised part of the bottom plate is embedded in the frame; the bottom surface of the piston block, the inner side surface of the frame and the convex surface of the bottom plate enclose a closed die cavity; a sealing strip is additionally arranged between the frame and the bottom plate and is locked by an inner hexagon bolt, and a nut is sunk in the bottom plate; a sealing strip is additionally arranged between the piston block and the frame, and sliding sealing is realized between the piston block and the frame; the sealing strip between the piston block and the frame is locked with the frame through screws by the rubber strip pressing plate, the size of the inner ring of the rubber strip pressing plate is matched with that of the inner ring of the frame, and the outer side of the rubber strip pressing plate is matched with the reserved size of the frame and the size width of the limiting block. The mould injects glue under a large-size limiting block, and the 3D textile composite material with required parameters is finally prepared by matching the mould cavity size regulating and controlling module with the small-size limiting block by means of a hot-pressing platform after the glue injection is finished. The mould can realize glue injection under low fiber content, the glue injection is quicker and more sufficient, and the production efficiency is greatly improved.

For realizing the accurate regulation and control of die cavity size and RTM method injecting glue, the utility model provides a can prepare the RTM mould of super high fiber content 3D machine weaving bulletproof composite, realized high pressure dynamic seal, withstand voltage degree can reach 3MPa. The die cavity height of the die can be adjusted, the accurate control of the thickness of the composite material can be realized by selecting the corresponding limiting blocks, and the control range can reach 2-6mm.

The upper surface of the die cavity is provided with a piston block in the die cavity size regulating module, and the cross section size of the piston is consistent with the size of a workpiece.

In order to improve the precision of the finished piece and the durability of the die, the side surface of the die cavity is of an integral structure.

A square sealing strip is added between a piston block and a frame of the die cavity size regulating module for sealing, and the sealing strip is locked by an adhesive tape pressing plate, so that the high-pressure dynamic sealing function of the piston block is realized.

The lower surface of the die cavity is a bottom plate, a square sealing strip is added between the bottom plate and the frame for sealing, the edge is connected with the frame and the bottom plate through screws, and the sealing strip is tightly pressed. In order to facilitate pressurization, a sinking screw is adopted. In order to facilitate the removal of the mold, the bottom plate is provided with a plurality of jackscrew holes.

In order to enlarge the movable range of the piston block, the feed inlet and the discharge outlet are arranged on the bottom plate. After the resin is injected from the feed inlet, the diversion groove is filled with the resin, and then the prefabricated body is soaked. The discharge hole and the feed inlet are basically designed in the same way, and the feed inlet and the discharge hole are distributed in the middle along the length direction of the die.

The limiting block is set according to the parameters of the required workpiece, and in the preparation process, the upper surface of the limiting block is flush with the upper surface of the piston block or is simultaneously compressed to be considered that the material is pressed in place.

In order to facilitate the carrying of the crown block, symmetrical hoisting holes are designed at all parts of the die.

Compared with the prior art, the utility model has the advantages that: the mould can realize quick glue injection of resin at low fiber content, and extrude redundant resin under high pressure by virtue of a press or a hot-pressing platform, so that the resin is cured and formed after set parameters are reached, and the production efficiency is high; the sealing strip with the sectional area larger than 100mm < 2 > is used, high-pressure dynamic sealing is realized, so that the accurate regulation and control of the thickness of the composite material are realized, and the regulation and control range is 2-6mm; the fiber volume content of the 3D woven preform prepared usually is lower than 50%, while in the field of bulletproof materials, the fiber volume content directly determines the bulletproof performance of the material to a certain extent, the fiber volume content of the composite material prepared by the mold can reach 65-90%, and the design of the mold provides help for preparing the ultrahigh-fiber-content 3D woven preform reinforced composite material for bulletproof. Further, the composite material which can be prepared by the mould comprises a two-dimensional flat plate, a curved plate with equal thickness and an equal-thickness plate with variable curvature.

Drawings

The invention will be explained in more detail below with reference to an exemplary embodiment illustrated in the six drawings. Wherein:

fig. 1 is an isometric view of a RTM mold that can produce a super high fiber content 3D woven ballistic composite of the present invention;

FIG. 2 is an isometric view of the frame of the mold of the present invention;

fig. 3 is a top view of the frame of the mold of the present invention;

FIG. 4 is an isometric view of the die base plate of the present invention;

FIG. 5 is a top view of the mold bottom plate of the present invention;

FIG. 6 isbase:Sub>A sectional view of the mold of the present invention taken along line A-A;

reference numbers in the figures: piston block 1, adhesive tape clamp plate 2, frame 3, bottom plate 4, limiting block 5, die cavity side 301, upper adhesive tape groove 302, adhesive tape clamp plate and frame locking hole 303, frame hoisting hole 304, lower adhesive tape groove 305, frame and bottom plate locking hole 306, bottom plate top thread hole 401, bottom plate and frame locking hole 402, feed inlet 403, bottom plate hoisting hole 404, discharge outlet extension hole 405, feed inlet extension hole 406, discharge outlet diversion trench 407, feed inlet diversion trench 408, discharge outlet 409.

Detailed Description

The technical solution in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are only some embodiments, not all embodiments, and should not be construed as limiting the present invention.

As shown in fig. 1, the RTM mold capable of preparing the ultrahigh fiber content 3D woven bulletproof composite material includes a piston block 1, an adhesive tape pressing plate 2, a frame 3, a base plate 4, and a limiting block 5, wherein the piston block 1 and the limiting block 5 collectively form a mold cavity size regulating module. High-pressure dynamic sealing is realized between the piston block 1 and the frame 3 through an upper sealing strip, and the upper sealing strip is locked with the frame 3 through an adhesive tape pressing plate 2. The bottom end of the frame 3 is provided with a lower sealing strip which is locked by the edge of the bottom surface of the frame 3 and the bottom plate 4. The double square sealing strips are sealed up and down, and the pressure resistance degree can reach 3MPa.

As fig. 2 is the utility model discloses the frame orthographic view of mould, when laying the preform, the preform side will closely paste die cavity side 301. After the prefabricated body is laid, the piston block 1 is placed. An upper sealing strip is placed in the upper sealing strip groove 302 in a manner of clinging to the piston block, and then is locked by the adhesive tape pressing plate 2, and the adhesive tape pressing plate corresponds to the frame locking hole 303. The handling process is via the rim lifting holes 304.

If fig. 3 is the utility model discloses the top view of frame 3 of mould, before laying the preform, put into square sealing strip in the lower adhesive tape groove 305 of frame bottom earlier for the first step, the frame bottom locking hole 306 that will pack into the lower sealing strip again corresponds with bottom plate locking hole 402 for link locking, then begin to lay the preform again.

Fig. 4 and 5 are an isometric view of the bottom plate 4 and a top view of the bottom plate 4, respectively, and the feed port 403 and the discharge port 409 are opened on the bottom plate 4 in order to enlarge the range of the stroke of the piston block 1. Because the upper surface of the bottom plate is raised to form the lower surface of the die cavity, the positions of the feed port and the discharge port are lower, and in order to facilitate the die removal, a feed port extension hole 406 and a discharge port extension hole 405 are respectively designed at the feed port 403 and the discharge port 409. During glue injection, resin enters from the feed inlet 403, is dispersed through the feed inlet extension hole 406 and the feed inlet diversion trench 408 respectively, and finally is discharged from the discharge port 409 through the discharge port diversion trench 407 and the discharge port extension hole 405 respectively. For the convenience of carrying, the bottom plate is provided with symmetrically distributed hoisting holes 404, and for the convenience of mould removal, the bottom plate is provided with symmetrical jackscrew holes 401.

Fig. 6 isbase:Sub>A cross-sectional view taken along linebase:Sub>A-base:Sub>A of the mold of the present invention, showing the complete dimension adjustable mold cavity side 301, and the design details of the feed and discharge ports and seal grooves.

The above embodiments are only used for illustration and not for limiting the technical solution of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify or equivalently replace the present invention. Any modification, partial replacement, or improvement made within the spirit and principles of the present invention should be included in the scope of the claims of the present invention.

Claims (4)

1. An RTM mould capable of preparing a 3D woven bulletproof composite material with ultrahigh fiber content is characterized in that: the mold mainly comprises a piston block, an adhesive tape pressing plate, a frame, a bottom plate and a limiting block, wherein the piston block and the limiting block are matched to form a mold cavity size regulating module; the piston block, the frame and the bottom plate are matched in size, the piston block is embedded in the frame, and the raised part of the bottom plate is embedded in the frame; the bottom surface of the piston block, the inner side surface of the frame and the convex surface of the bottom plate enclose a closed die cavity; a sealing strip is additionally arranged between the frame and the bottom plate and is locked by an inner hexagon bolt, and a nut is sunk in the bottom plate; the sealing strip between the piston block and the frame is locked with the frame through screws by the rubber strip pressing plate, the size of the inner ring of the rubber strip pressing plate is matched with that of the inner ring of the frame, and the outer side of the rubber strip pressing plate is matched with the reserved size of the frame and the size width of the limiting block.

2. The RTM mold for making an ultra-high fiber content 3D woven ballistic composite of claim 1, wherein: the sectional area of the piston block and the frame is more than 100mm ² The sealing strip, the piston block and the frame realize sliding sealing, and the pressure resistance degree can reach 3MPa.

3. The RTM mold for making an ultra-high fiber content 3D woven ballistic composite of claim 1, wherein: the die cavity size regulating module of the die regulates the height of the piston block by selecting the corresponding limiting block, so that the die cavity height is regulated and controlled, the accurate control of the thickness of the composite material is realized, and the control range can reach 2-6mm.

4. The RTM mold for making an ultra-high fiber content 3D woven ballistic composite of claim 1, wherein: when the mould is used for preparing the RTM composite material with the ultrahigh fiber content, a hot-pressing table of 100-500 tons is needed, and the volume content of the 3D woven fabric reinforced bulletproof composite material can reach 65-90 percent.

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