CN114770973A - Bending and torsion-resistant composite molding method and production line for polygonal composite cylinder with long inner ribs - Google Patents

Abstract

The invention provides a bending and twisting resistant composite molding method for a polygonal composite material cylinder. The invention provides a bending-torsion-resistant composite forming production line for a polygonal composite material cylinder, which is characterized by comprising the following steps of: a core mold pulling system; a fiber cloth guide device; a middle layer yarn guiding plate device; a winding device; a ply yarn guiding plate device; a first weaving mechanism; a layer laying mechanism; a second weaving mechanism; a grease injection and curing system; a molded composite product traction device; and a cutting device. In the invention, the polygonal cylinder and the rib plate are formed by pultrusion at one time, so that the production efficiency is high and the labor cost is low; the polygonal barrel adopts a composite molding process of mixed weaving, layer yarn layering, winding yarn and fiber cloth layering, so that the mechanical properties of the barrel, such as axial strength, ring stiffness, bending resistance, torsion resistance, shear resistance and the like, are greatly improved; the transition area between adjacent rib plates adopts the pultrusion process of fiber cloth and ply yarn, so that the connection strength of the rib plates and the cylinder body is increased.

Description

Bending-torsion-resistant composite molding method and production line for polygonal composite cylinder with long inner ribs

technical field

The invention relates to a bending and torsion-resistant composite molding method for a polygonal composite cylinder with long inner ribs and a bending-torsion-resistant composite molding production line for a polygonal composite cylinder with long inner ribs based on the composite molding method. Among them, the long inner rib means that the cylinder has a long protruding reinforcing rib shape on the inner side of the cross section, and the size of the reinforcing rib is on the same order of magnitude as the cross-sectional size of the cylinder; polygon refers to quadrilateral, pentagon, hexagon, octagon, etc. Geometric shape; composite material refers to a composite material formed by compounding carbon fiber/glass fiber as reinforcing fiber and resin as matrix.

Background technique

For special needs, polygonal cylinders are often used in municipal engineering, power communication, building water supply and drainage and other industries. In order to strengthen the structure and improve the bending and torsion resistance, long strip-shaped rib plates are often designed on the inner wall of the cylinder. In the national defense industry, the long rib plate on the inner wall of the cylinder can also be used as a guide rail, and materials or devices can be transported through the guide rail inside the cylinder. The polygonal cylinder is very important.

At present, most of the polygonal cylinders are made of metal materials. The metal materials are of high quality, the internal structure of the cylinder is complex, and the processing is difficult. With the rapid development of high-performance fibers such as carbon fiber and glass fiber, their advantages of high strength and light weight have been gradually applied to the preparation of cylinders in recent years. The preparation process of high-performance fiber composite materials is diverse and complex, and many products are still at the stage that requires a lot of manpower.

At present, when using high-performance fibers to prepare a cylinder with a guide rail, the cylinder and the long rib are usually formed separately. The cylinder adopts the carbon fiber shaft yarn pultrusion process, and the long rib adopts the carbon fiber prepreg hand lay-up layer. process, the two are connected by glue after forming. The above-mentioned process has the following shortcomings: 1. The method of forming and reassembling the cylinder body and the elongated rib plate separately is low in production efficiency, and the labor cost of the carbon fiber prepreg hand lay-up process is high; 2. The cylinder body adopts the carbon fiber shaft yarn pultrusion process, The parts are easy to be delaminated and not shear resistant; 3. The shape and position error of the long rib plate and the cylinder cannot be guaranteed by the gluing process, and sometimes it needs to be reprocessed after gluing.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a molding process and a molding production line for a polygonal composite material cylinder with elongated inner ribs, which can ensure the connection strength between the cylinder and the elongated inner ribs and has high production efficiency.

In order to achieve the above purpose, a technical solution of the present invention is to provide a method for forming a polygonal composite material cylinder with anti-bending and torsion. A polygonal core mold is used, and a plurality of corners of the polygonal core mold are respectively used for forming long strips. The long groove of the inner rib is characterized in that, the composite molding method comprises the following steps:

The outer surface of the polygon core mold is covered with fiber cloth to form a fiber cloth layer;

Lay layup yarns on the outside of the fiber cloth layer to form an inner fiber layup;

Rotate the winding yarn to the outside of the inner fiber layer to form a winding layer;

Lay layup yarns on the outside of the winding layer to form an intermediate fiber layup;

Weaving on the outside of the intermediate fiber layup to form an inner braided layer;

Lay layup yarns on the outside of the inner braid to form an outside fiber layup;

Weaving on the outside of the outer fiber layup to form an outer braided layer;

A seven-layer hybrid structure preform consisting of fiber cloth layer, inner fiber layup, winding layer, middle fiber layup, inner braided layer, outer fiber layup and outer braided layer is formed outside the side core mold. In the seven-layer hybrid structure preform, only the fiber cloth layer and the inner layer fiber layup are located at the position of the long strip; the polygonal core mold covered with the seven-layer hybrid structure preform is sent to the outer mold. , carry out high pressure grease injection and curing molding, the molded product is continuously pulled out, and after each pull out for a certain distance, the molded product is obtained by cutting.

Preferably, the thickness of the seven-layer hybrid structure preform can be adjusted as required.

Another technical solution of the present invention is to provide a polygonal composite material cylinder body bending and torsion-resistant composite molding production line, which is characterized in that, comprising:

Mandrel pulling system for pushing the polygonal mandrel into the outer mold;

Fiber cloth guiding device, used to wrap the fiber cloth on the outer surface of the polygonal core mold to form a fiber cloth layer;

The middle layer yarn guide plate device is used to lay the layer yarn on the outside of the fiber cloth layer to form the inner layer fiber layer;

Winding device, used to rotate the winding yarn to the outside of the inner fiber layer to form a winding layer;

The layered yarn guide plate device is used to lay the layered yarn on the outside of the winding layer to form an intermediate fiber layer;

The first weaving mechanism is used to weave the outer side of the intermediate fiber layup to form the inner braided layer;

The layering mechanism is used to lay the layered yarn on the outside of the inner braid to form the outer fiber layer;

The second weaving mechanism is used to weave the outer layer of the outer fiber layer to form an outer layer of braided layer;

Grease injection curing system, used for high pressure grease injection and curing molding;

The forming composite material product pulling device is used to continuously pull out the formed product obtained by the grease injection curing system;

The cutting device is used to cut a shaped product after pulling out a certain distance.

Preferably, a mandrel support frame is also included for supporting the polygonal mandrel during the pushing process.

Preferably, the knitting mechanism 1, the laying mechanism and the knitting mechanism 2 are independent mechanisms; or the knitting mechanism 1, the laying mechanism and the knitting mechanism 2 are integrated in the belt-laying hybrid In the knitting machine; or the knitting mechanism 1 and the knitting mechanism 2 are integrated in the three-dimensional knitting machine.

Preferably, the fiber cloth guiding device is composed of four special-shaped plates with gradual shrinkage, and the special-shaped plates are evenly arranged along the circumferential direction;

Each gradient-shrinking special-shaped sheet is a thin space curved body, one end of the thin space curved body is a plurality of circumferentially evenly distributed thin straight plates, and the other end is a plurality of separate and final fiber cloth layers. Consistent thin curved plate; the middle of the thin space curved body is a smooth transition area, and the two ends of the thin space curved body realize a smooth transition through the smooth transition area; the thin straight plate at one end of the thin space curved body and the thin curved plate at the other end have the same length ;

The fiber cloth is divided into multiple rolls according to the polygonal shape, which are respectively laid on the thin straight plate. With the feeding of the pultrusion, the fiber cloth gradually changes from the thin straight plate end through the smooth transition area and is fully spread to the thin curved plate end surface, so that the fiber Spread the cloth into the desired shape.

The present invention has the following beneficial effects:

(1) One-time pultrusion molding of polygonal cylinder and ribs, with high production efficiency and low labor cost.

(2) The polygonal cylinder body adopts the composite molding process of mixed weaving + laying yarn + winding yarn + fiber cloth laying, which greatly improves the mechanical properties of the cylinder body such as axial strength, ring stiffness, bending resistance, torsion resistance, shear resistance, etc. .

(3) The transition area between adjacent ribs adopts the pultrusion process of fiber cloth + layered yarn, which increases the connection strength between the ribs and the cylinder body.

Description of drawings

Fig. 1 is the production line schematic diagram disclosed in the embodiment;

Fig. 2 is the structural representation of the polygon core mold used;

Figure 3 is a sectional view of the final product obtained;

Fig. 4 is the enlarged schematic diagram of part I in Fig. 3;

Fig. 5 is the enlarged schematic diagram of part II in Fig. 3;

Fig. 6 is the front structure schematic diagram of the space special-shaped guide structure;

FIG. 7 is a schematic side view of the spatial special-shaped guide structure.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

This embodiment discloses a method for bending and torsion-resistant composite molding of a polygonal composite material cylinder with elongated inner ribs. A polygonal core mold 2 is used, and multiple corners of the polygonal core mold 2 are respectively used for forming long strips. If the long groove of the inner rib is formed, the composite molding method specifically includes the following steps:

The polygonal mandrel 2 is pushed into the outer mold by the mandrel pulling system 1. During the pushing process:

Step 1. The fiber cloth 3 is wrapped on the outer surface of the polygonal core mold 2 through the fiber cloth guide device 4 to form a fiber cloth layer A, which is the first layer;

Step 2, laying the first part of the layup yarn placed on the layup creel 6 on the outer side of the fiber cloth layer A through the intermediate layup yarn guide plate device 5 to form the inner layer fiber layup layer B, which is the second layer;

Step 3, the winding device 7 rotates the winding yarn to the outside of the inner fiber layer B to form the winding layer C, which is the third layer;

Step 4, laying the second part of the layup yarn placed on the layup creel 6 on the outside of the winding layer C through the layup yarn guide plate device 8 to form an intermediate fiber layup D, which is the fourth layer;

Step 5, using the inner ring spindle of the hybrid braiding machine 9 with a layer to weave on the outer side of the intermediate fiber layer D to form an inner layer braid E, which is the fifth layer;

Step 6. Use the middle layer of the hybrid braiding machine 9 with the layer to lay the second part of the lay-up yarn placed on the lay-up creel 6 on the outside of the inner woven layer E to form the outer fiber lay-up layer F, which is the first six layers;

Step 7, using the outer ring spindle of the hybrid braiding machine 9 with a layer to weave on the outer side of the outer fiber layer F to form an outer braid G, which is the seventh layer;

As a result, a fiber cloth layer A, an inner fiber layer B, a winding layer C, an intermediate fiber layer D, an inner woven layer E, an outer fiber layer F, and an outer woven layer G are formed outside the polygonal core mold 2. The seven-layer hybrid structure preform is composed, in the seven-layer hybrid structure preform, only the fiber cloth layer A and the inner layer fiber laying layer B are located at the position of the long strip; After the polygonal core mold 2 of the molded body is sent into the outer mold, the grease injection and curing system 10 is used to perform high-pressure grease injection and curing molding. Then, the shaped product is obtained by cutting by the cutting device 13, so as to obtain the final product with a certain length.

In the above method, the thickness of the seven-layer hybrid structure preform can be adjusted as required; the hybrid braiding machine 9 with layers can also be a three-dimensional braiding machine or a common single-layer braiding machine. In the final product obtained, the innermost fiber cloth forms a complete reinforcing layer at the root of the rib plate and the inner surface of the polygonal cylinder, which can significantly enhance the bending resistance and overall torsion resistance of the long strip inner rib in the cylinder. sex.

The present invention provides a production line for bending and torsion-resistant composite molding of polygonal composite material cylinders with long inner ribs. The composite molding method described above is adopted, except that it includes a core mold traction system 1, a polygonal core mold 2, a fiber cloth guide device 4, Middle layup yarn guide plate device 5, layup creel 6, winding device 7, layup yarn guide plate device 8, belt layup hybrid braiding machine 9, grease injection curing system 10, forming composite material product pulling device 12 and cutting In addition to device 13, it also includes:

The mandrel support frame 14 is used to support the polygonal mandrel 2 during the pushing process.

In this embodiment, due to the complex structure of the cylinder body, the laying of the innermost carbon cloth layer is relatively difficult. The fiber cloth guide device 4 is designed to adopt a special spatial special-shaped guide structure, which is composed of four gradient-shrinking special-shaped plates 4-1. , the special-shaped plates 4-1 are evenly arranged along the circumferential direction. The gradient-shrinking special-shaped plate 4-1 is a thin space curved body formed by stamping/bending a thin plate. The cross-sectional shape of one end of the thin space curved body is a plurality of thin straight plates uniformly distributed in the circumferential direction, and the cross-sectional shape of the other end is a plurality of separated thin curved plates consistent with the final forming shape of the fiber cloth layer A. The middle of the thin space curved body is a smooth transition area, and the two ends of the thin space curved body realize smooth transition through the smooth transition area. The length of the thin straight plate at one end of the thin space curved body and the thin curved plate at the other end is equal. The fiber cloth 3 is divided into multiple rolls according to the polygonal shape, which are respectively laid on the thin straight plate. With the feeding of the pultrusion, the end of the thin straight plate gradually changes through the smooth transition area and is fully spread to the surface of the thin curved plate end. Through such a guide area, the fiber cloth 3 can be smoothly laid into a desired shape.

Claims (6)

1. a polygonal composite material cylinder anti-bending torsion composite molding method, adopts a polygonal core mold, and a plurality of corners of the polygonal core mold respectively have a plurality of long grooves for forming elongated inner ribs, it is characterized in that, The composite molding method includes the following steps: The outer surface of the polygon core mold is covered with fiber cloth to form a fiber cloth layer; Lay layup yarns on the outside of the fiber cloth layer to form an inner fiber layup; Rotate the winding yarn to the outside of the inner fiber layer to form a winding layer; Lay layup yarns on the outside of the winding layer to form an intermediate fiber layup; Weaving on the outside of the intermediate fiber layup to form an inner braided layer; Lay layup yarns on the outside of the inner braid to form an outside fiber layup; Weaving on the outside of the outer fiber layup to form an outer braided layer; A seven-layer hybrid structure preform consisting of fiber cloth layer, inner fiber layup, winding layer, middle fiber layup, inner braided layer, outer fiber layup and outer braided layer is formed outside the side core mold. In the seven-layer hybrid structure preform, only the fiber cloth layer and the inner layer fiber layup are located at the position of the long strip; the polygonal core mold covered with the seven-layer hybrid structure preform is sent to the outer mold. , carry out high pressure grease injection and curing molding, the molded product is continuously pulled out, and after each pull out for a certain distance, the molded product is obtained by cutting. 2 . The bending and torsion-resistant composite molding method for a polygonal composite material cylinder according to claim 1 , wherein the thickness of the seven-layer hybrid structure preform can be adjusted as required. 3 . 3. A polygonal composite material cylinder body bending and torsion-resistant composite molding production line is characterized in that, comprising: Mandrel pulling system for pushing the polygonal mandrel into the outer mold; Fiber cloth guiding device, used to wrap the fiber cloth on the outer surface of the polygonal core mold to form a fiber cloth layer; The middle layer yarn guide plate device is used to lay the layer yarn on the outside of the fiber cloth layer to form the inner layer fiber layer; Winding device, used to rotate the winding yarn to the outside of the inner fiber layer to form a winding layer; The layered yarn guide plate device is used to lay the layered yarn on the outside of the winding layer to form an intermediate fiber layer; The first weaving mechanism is used to weave the outer side of the intermediate fiber layup to form the inner braided layer; The layering mechanism is used to lay the layered yarn on the outside of the inner braid to form the outer fiber layer; The second weaving mechanism is used to weave the outer layer of the outer fiber layer to form an outer layer of braided layer; Grease injection curing system, used for high pressure grease injection and curing molding; The forming composite material product pulling device is used to continuously pull out the formed product obtained by the grease injection curing system; The cutting device is used to cut a shaped product after pulling out a certain distance. 4 . The bending and torsion-resistant composite molding production line for a polygonal composite material cylinder according to claim 3 , further comprising a core mold support frame for supporting the polygonal core mold during the pushing process. 5 . 5. The anti-bending and torsion-resistant composite molding production line for a polygonal composite cylinder body according to claim 3, wherein the first weaving mechanism, the layering mechanism and the second weaving mechanism are independent mechanisms; Alternatively, the first knitting mechanism, the layering mechanism, and the second knitting mechanism are integrated into a hybrid knitting machine with layering; or the first knitting mechanism and the second knitting mechanism are integrated into a three-dimensional knitting machine. 6 . The anti-bending and torsion composite molding production line for a polygonal composite cylinder body according to claim 3 , wherein the fiber cloth guiding device is composed of four special-shaped plates with gradual shrinkage, and the special-shaped plates are along the circumferential direction. 7 . evenly arranged; Each gradient-shrinking special-shaped sheet is a thin space curved body, one end of the thin space curved body is a plurality of circumferentially evenly distributed thin straight plates, and the other end is a plurality of separate and final fiber cloth layers. Consistent thin curved plate; the middle of the thin space curved body is a smooth transition area, and the two ends of the thin space curved body realize a smooth transition through the smooth transition area; the thin straight plate at one end of the thin space curved body and the thin curved plate at the other end have the same length ; The fiber cloth is divided into multiple rolls according to the polygonal shape, which are respectively laid on the thin straight plate. With the feeding of the pultrusion, the fiber cloth gradually changes from the thin straight plate end through the smooth transition area and is fully spread to the thin curved plate end surface, so that the fiber Spread the cloth into the desired shape.

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