CN112549378A - Integrated forming die and method for composite material corrugated interlayer cylinder - Google Patents

Abstract

The invention discloses an integrated molding die of a composite material corrugated sandwich cylinder and a method thereof. The invention adopts the inner cylindrical mold, the cell mold and the positioning plate, and after three solidifications, the composite material corrugated interlayer cylinder is prepared, the inner panel, the trapezoidal corrugated interlayer structure and the outer panel are integrally formed, the panel and the trapezoidal corrugated interlayer structure are continuous, and the composite material is improved. The overall mechanical properties of the material corrugated sandwich cylinder; the mold design is reasonable, the structure is simple, the assembly and disassembly are convenient, and the reusability is strong. The cell mold and the positioning plate cooperate with each other to ensure the accurate positioning of the cell mold; the positioning plate can be reused First, two semi-curings are used to ensure the compactness of the composite corrugated interlayer cylinder and improve the mechanical properties of the structure; the process method of the invention is simple to implement, convenient to process, and has strong flexibility, and only one set of inner cylinders is used. The mold and the positioning plate mold can prepare composite corrugated sandwich cylinders with different thicknesses and different numbers of trapezoidal cells.

Description

A kind of integrated molding die of composite material corrugated sandwich cylinder and method thereof

technical field

The invention relates to a technology for preparing a composite material corrugated interlayer cylinder, in particular to an integrated molding die for a composite material corrugated interlayer cylinder and a molding method thereof.

Background technique

With the vigorous development of aerospace and aviation industry, it is very important to further improve the carrying capacity and carrying efficiency of spacecraft. The sandwich structure is the structure with the highest bearing efficiency under axial compression, while the trapezoidal corrugated sandwich structure has higher bearing efficiency and lower manufacturing cost than structures such as honeycomb sandwiches and foam sandwiches. The sandwich structure of materials has higher bearing efficiency, and under the premise of ensuring the mechanical properties of the structure, the lightweight design of the structure is imperative.

At present, most of the composite corrugated sandwich cylinders are prepared by separating the inner and outer panels from the corrugated core layer, each structure is prepared independently, and then glued together.

SUMMARY OF THE INVENTION

In order to solve the problem that the core layer is mostly bonded in sections, and the core layer and the panel are also bonded together, which leads to poor structural mechanical properties, lack of special molds, and cumbersome preparation process, which cannot be mass-produced. To solve the problem, the present invention proposes an integrated molding die for a composite corrugated sandwich cylinder and a molding method thereof.

The composite material corrugated sandwich cylinder includes an inner panel, a trapezoidal corrugated core layer and an outer panel. Center-symmetric closely distributed cells, each cell includes two sub-cells, the cross-section of the internal space of each sub-cell is a trapezoid, the upper and lower bases of the trapezoid are arcs, and the upper base of the trapezoid of a sub-cell is greater than The lower base, the lower base of the trapezoid of another sub-cell is larger than the upper base.

An object of the present invention is to provide an integrated molding die for a composite corrugated sandwich cylinder.

The integrated molding die of the composite material corrugated sandwich cylinder body of the present invention comprises: an inner cylindrical die, an inner die positioning structure, a positioning hoisting shaft, a detachable structure of the inner die, a positioning plate, a positioning plate positioning structure, a positioning plate detachable structure, a positioning plate Cell mold structure, cell mold, mold release groove, cell mold positioning structure, mold release rod and mold release base; among them,

The outer surface of the inner cylindrical mold is cylindrical, and the diameter of the cylinder is the inner diameter of the inner panel of the composite material corrugated sandwich cylinder; the center of the two end faces of the inner cylindrical mold is respectively provided with an inner mold positioning structure; the center of the inner mold positioning structure is set There is a positioning and hoisting shaft; on the two end faces of the inner cylindrical mold and around the positioning structure of the inner mold, there are a plurality of detachable structures of the inner mold that are symmetrically distributed in the center;

The two positioning discs are of the same structure, and the positioning discs are flat; a positioning disc positioning structure is arranged in the center of the positioning disc, and the positioning disc positioning structure is complementary to the shape of the inner mold positioning structure; corresponding to the detachable structure of each inner mold , on the positioning plate and around the positioning structure of the positioning plate, there are a plurality of detachable structures of the positioning plate which are distributed symmetrically in the center; Distributed positioning cell mold structure;

Corresponding to each group of cells of the composite corrugated sandwich cylinder, multiple groups of cell molds are provided, each group of cell molds includes two sub-cell molds, and the shapes of the two sub-cell molds are respectively the same as those of the two sub-cell molds. The shape of the inner space of each sub-cell is the same; in the center of the two end faces of each sub-cell mold, there are demolding grooves respectively; corresponding to the multiple positioning cell mold structures on the positioning plate, in the corresponding multiple The centers of both ends of each sub-cell mold are respectively provided with a cell mold positioning structure, and for the sub-cell mold provided with the cell mold positioning structure, the mold release groove is arranged on the center of the cell mold positioning structure;

The shape of the demoulding rod is a cylinder, and the end face of the top is provided with a demoulding boss, which matches with the demoulding groove of the sub-cell mold, and a positioning groove is processed on the side wall of the bottom end, which is matched with the demoulding base; The upper surface of the demoulding base is complementary to the shape of the positioning slot, and is placed on the installation position of the demoulding machine, and the bottom end of the demoulding rod is fixed on the demoulding base through the positioning slot;

Lay fiber prepreg on the outer sidewall of the inner cylindrical mold and the outer sidewall of each sub-cell mold, wrap two layers of biaxially oriented polypropylene film on the laid fiber prepreg for semi-curing; after semi-curing , remove the biaxially oriented polypropylene film wrapped on the fiber prepreg; the inner mold positioning structure on one end face of the inner cylindrical mold is relatively installed with the positioning disk positioning structure of a positioning disk, and the inner mold detachable structure and the positioning disk are installed. The positions of the detachable structures are aligned, and the mounting pieces pass through the detachable structure of the positioning plate and the corresponding detachable structure of the inner mold in turn, and install a positioning plate on one end face of the inner cylindrical mold with the semi-cured fiber prepreg; The sub-cell molds whose ends are respectively provided with the cell mold positioning structure are respectively installed on the positioning plate through the positioning cell mold structure; another positioning plate is installed; the remaining sub-cell molds with fiber prepreg are correspondingly It is installed on the outer side wall of the inner cylindrical mold with semi-cured fiber prepreg, and the multi-group cell molds with semi-cured fiber prepreg are closely attached to the outer side wall of the inner cylindrical mold to form an annular shape. Two layers of biaxially oriented polypropylene film are wound on the outer side wall of the outer wall for the second semi-curing; after semi-curing, the wrapped biaxially oriented polypropylene film is removed; after the second semi-curing, there are multiple groups of cells of the fiber prepreg Fiber prepreg is laid on the outer side wall of the mold, and then two layers of biaxially oriented polypropylene film are wrapped on the outer surface of the fiber prepreg for curing; after curing, the inner cylindrical mold is removed, and the bottom end of the demoulding rod is passed through the positioning clip The groove is fixed on the demoulding base, and the demoulding boss at the top of the demolding rod matches the demolding groove of the sub-cell mold. Each sub-cell mold is pulled out, and finally the biaxially oriented polypropylene film is removed to obtain an integrated molding. composite corrugated sandwich cylinder.

The inner cylinder mold, positioning plate and cell mold are all made of steel.

The positioning plate positioning structure corresponds to the inner mold positioning structure, the positioning plate positioning structure is a through hole, and the inner mold positioning structure is a boss; or, the positioning plate positioning structure is a boss, and the inner mold positioning structure is a corresponding groove.

The detachable structure of the inner mold is an installation slot with internal threads; the detachable structure of the positioning plate is a mounting hole with internal threads; the mounting parts are screws; the detachable structure of the inner mold has the same aperture as the detachable structure of the positioning plate. Align with the corresponding installation groove, and install the positioning plate on the end face of the inner cylindrical mold by passing the screws through the installation hole and the corresponding installation groove in sequence.

The cell mold positioning structure matches the shape of the positioning cell mold structure; if the positioning cell mold structure is a through hole, the cell mold positioning structure is a protrusion; if the positioning cell mold structure is a protrusion, the cell mold positioning structure for grooves.

The radial length of the positioning cell mold structure on the positioning plate is greater than the length of the positioning structure on the end face of the sub-cell mold, which enables the sub-cell mold to ensure the positioning accuracy. The axial movement ensures the internal compactness of the structure.

The length of each sub-cell mold is slightly less than the length of the cylindrical mold, so that the upper and lower end surfaces of the sub-cell mold do not contact the surface of the positioning plate, and do not hinder the axial movement of the sub-cell mold inward after being pressed. The length of each sub-cell mold is 1-2 mm smaller than the length of the inner cylindrical mold.

The demolding groove of the sub-cell mold is machined with internal threads, and the outer surface of the demolding boss on the demolding rod is machined with external threads, which are matched and connected with the demolding groove of the sub-cell mold.

Composite corrugated interlayer cylinders with different numbers and sizes of cells can be positioned using the same number and position of positioning cell mold structures, which improves the reusability of positioning discs and saves costs.

Another object of the present invention is to provide an integrated molding method for a composite material corrugated sandwich cylinder.

The integrated molding method of the composite material corrugated sandwich cylinder body of the present invention comprises the following steps:

1) Clean the outer surface of the inner cylindrical mold and the outer surface of each sub-cell mold, and then evenly apply the release agent on the outer surface in turn, and apply the sealing agent to the release groove of the sub-cell mold to seal the holes;

2) Cut the fiber prepreg according to the required size;

3) Lay the cut fiber prepreg on the outer side wall of the cleaned inner cylindrical mold and the outer side wall of each sub-cell mold, and wrap two layers of biaxially oriented polypropylene on the laid fiber prepreg film;

4) placing the inner cylindrical mold wrapped with the biaxially oriented polypropylene film and each sub-cell mold in an autoclave for semi-curing;

5) After semi-curing, take out the semi-cured inner cylindrical mold and each sub-cell mold from the autoclave, cool down to room temperature, and remove the biaxially oriented polypropylene film wrapped on the fiber prepreg;

6) Mold installation:

a) Install the inner mold positioning structure on one end face of the inner cylindrical mold with the positioning disk positioning structure of a positioning plate relatively positive, and align the positions of the inner mold detachable structure and the positioning disk detachable structure, and pass the mounting parts in turn. The detachable structure of the positioning plate and the detachable structure of the inner mold, a positioning disk is installed on one end face of the inner cylindrical mold with the semi-cured fiber prepreg;

b) installing the sub-cell molds with the cell mold positioning structures at both ends respectively on the positioning plate through the positioning cell mold structures;

c) According to the method of step a), install another positioning plate at the other end of the inner cylindrical mold;

d) Place the remaining sub-cell molds with fiber prepreg on the outer sidewall of the inner cylindrical mold with fiber prepreg, and the multi-group cell molds with fiber prepreg are used. The viscosity of the fiber prepreg surface is close to the outer side wall of the inner cylindrical mold, forming a circular ring;

e) winding two layers of biaxially oriented polypropylene film on the outer surface of the cell mold;

7) Put the installed mold in step 6) into the autoclave again, and carry out the second semi-curing;

8) After the second semi-curing, the structure after the second semi-curing in step 7) is taken out from the autoclave, cooled to room temperature, and the wrapped biaxially oriented polypropylene film is removed;

9) laying fiber prepreg on the outer side wall of the multi-group cell mold with the fiber prepreg secondary semi-cured, and then wrapping two layers of biaxially oriented polypropylene film on the outer surface of the fiber prepreg;

10) Place in an autoclave for final curing;

11) After curing, take it out from the autoclave, bring it down to room temperature, remove the sealing agent in the demolding grooves of all sub-cell moulds, remove the inner cylindrical mould, and fix the bottom end of the demoulding rod on the On the demolding base, the demoulding boss at the top of the demolding rod matches the demolding groove of the sub-cell mold, pull out each sub-cell mold, remove the biaxially oriented polypropylene film, and then grind the end face to obtain an integrated Formed composite corrugated sandwich cylinder.

Wherein, in step 4), the curing pressure inside the autoclave is 1-2 MPa, the curing temperature is 80-90° C., and the curing time is 1-2 hours.

In step 6), the detachable structure of the inner mold and the detachable structure of the positioning plate respectively have internal threads, and the mounting parts use screws with external threads.

In step 7), in the second semi-curing, the curing pressure inside the autoclave is 1-2 MPa, the curing temperature is 80-90° C., and the curing time is 1-2 hours.

In step 10), the curing pressure inside the autoclave is 2-3 MPa, the curing temperature is 120-130° C., and the curing time is 1.5-2 hours.

Advantages of the present invention:

The invention adopts the inner cylindrical mold, the cell mold and the positioning plate, and after three solidifications, the composite material corrugated interlayer cylinder is prepared, the inner panel, the trapezoidal corrugated interlayer structure and the outer panel are integrally formed, the panel and the trapezoidal corrugated interlayer structure are continuous, and the composite material is improved. The overall mechanical properties of the material corrugated sandwich cylinder provide a guarantee for the further study of the mechanical properties of the structure; the mold design is reasonable, the structure is simple, the assembly and disassembly are convenient, and the reusability is strong. Accurate positioning of the original mold; reusability of the positioning plate, cost saving; the present invention adopts two semi-curing first to ensure the compactness of the corrugated interlayer cylinder of the composite material and improve the mechanical properties of the structure; the process method of the present invention is simple to realize , The processing is convenient and the flexibility is strong. Only one set of inner cylindrical mold and positioning plate mold can be used to prepare composite material corrugated sandwich cylinders with different thicknesses and different trapezoidal cell numbers.

Description of drawings

Fig. 1 is the schematic diagram of the composite material corrugated sandwich cylinder;

2 is a schematic diagram of the overall structure of an embodiment of an integrated molding die for a composite corrugated sandwich cylinder of the present invention;

3 is a schematic diagram of an inner cylindrical mold of an embodiment of the integrated molding mold of the composite corrugated sandwich cylinder of the present invention;

4 is a schematic diagram of a positioning plate of an embodiment of the integrated molding die of the composite corrugated sandwich cylinder of the present invention;

5 is a schematic diagram of a sub-cell mold of an embodiment of the integrated molding mold of the composite corrugated sandwich cylinder of the present invention;

6 is a schematic diagram showing that the end face of the sub-cell mold of an embodiment of the integrated molding mold of the composite corrugated sandwich cylinder body is provided with a cell mold positioning structure;

7 is a schematic diagram of a demolding rod and a demolding base of an embodiment of the integrated molding die of the composite corrugated sandwich cylinder of the present invention;

8 is a schematic diagram of laying fiber prepreg in the inner cylindrical mold of an embodiment of the integrated molding mold of the composite corrugated sandwich cylinder of the present invention;

9 is a schematic diagram of laying fiber prepreg in a sub-cell mold of an embodiment of the integrated molding mold of the composite corrugated sandwich cylinder of the present invention;

10 is a schematic diagram of laying fiber prepreg after the mold is installed in an embodiment of the integrated molding mold of the composite corrugated sandwich cylinder of the present invention.

Detailed ways

Below in conjunction with the accompanying drawings, the present invention will be further described through specific embodiments.

As shown in Figure 1, the composite material corrugated sandwich cylinder includes an inner panel 01, a trapezoidal corrugated core layer 02 and an outer panel 03. The cylindrical outer panel 03 is coaxially sleeved outside the inner panel 01, with trapezoidal corrugations between them. The core layer 02, the trapezoidal corrugated core layer 02 includes a plurality of cells 021 that are symmetrically and closely distributed in the center, each cell includes two sub-cells, the cross-section of the inner space of each sub-cell is a trapezoid, and the upper and lower bottoms of the trapezoid are both. is arc-shaped, in which the upper base of the trapezoid of one sub-cell is larger than the lower base, and the lower base of the trapezoid of the other sub-cell is larger than the upper base. The left picture is a three-dimensional view, and the right picture is a cross-sectional view.

As shown in FIG. 2 , the integrated molding die of the composite corrugated sandwich cylinder body of this embodiment includes: an inner cylindrical die 1, an inner die positioning structure 1-1, an inner die detachable structure 1-2, and a positioning and hoisting shaft 1- 3. Positioning plate 2, positioning cell mold structure 2-1, positioning plate positioning structure 2-2, positioning plate removable structure, cell mold 3, demoulding groove, cell mold cell mold positioning structure 4, demoulding rod 5 and demoulding base 6; wherein,

As shown in Figure 3, the outer surface of the inner cylindrical mold 1 is cylindrical, and the diameter of the cylinder is the inner diameter of the inner panel of the composite material corrugated sandwich cylinder; the centers of the two end faces of the inner cylindrical mold 1 are respectively provided with inner mold positioning structures 1-1, the inner mold positioning structure 1-1 is a boss; the center of the inner mold positioning structure 1-1 is provided with a positioning and hoisting shaft 1-3 to carry the inner cylindrical mold; On the end surface and around the inner mold positioning structure 1-1, there are four inner mold detachable structures 1-2 distributed symmetrically in the center, and the inner mold detachable structure 1-2 is an installation groove and has an inner thread;

As shown in FIG. 4 , the two positioning disks 2 are of the same structure, and the positioning disk 2 is a flat plate; a positioning disk positioning structure 2-2 is arranged in the center of the positioning disk 2, and the positioning disk positioning structure 2-2 is a through hole, The positioning disk positioning structure 2-2 and the inner mold positioning structure 1-1 are complementary in shape; corresponding to each inner mold detachable structure 1-2, on the positioning disk 2 and located at the position of the positioning disk positioning structure 2-2. Around, there are four detachable structures of positioning discs distributed symmetrically in the center. The detachable structures of the positioning discs are mounting holes and have internal threads; The installation holes are aligned with the corresponding installation grooves, and the installation parts 2-3 pass through the installation holes and the corresponding installation grooves in turn. The installation parts use screws to install a positioning plate 2 on one end face of the inner cylindrical mold 1; On the plate 2 and around the detachable structure of the positioning plate, there are four positioning cell mold structures 2-1 distributed symmetrically in the center, and the positioning cell mold structures are through holes;

As shown in FIG. 5 , corresponding to each group of cells of the composite corrugated sandwich cylinder, ten groups of cell molds 3 are provided, and each group of cell molds 3 includes two sub-cell molds. The shape is the same as the shape of the inner space of the two sub-cells in a group of cells; in the center of the two end faces of each sub-cell mold, there are demolding grooves; The cell mold structures 2-1 correspond to each other, and the center of the two ends of the corresponding four sub-cell molds are respectively provided with cell mold positioning structures 4, and the cell mold positioning structures are matched with the shape of the through holes of the positioning cell mold structure. For the sub-cell mold provided with the cell mold positioning structure 4, the mold release groove is set on the center of the cell mold positioning structure, and the mold release groove of the sub-cell mold is processed with internal threads, as shown in Figure 6 Show;

As shown in FIG. 7 , the shape of the stripping rod 5 is a cylinder, and the end face of the top end is provided with a stripping boss and an external thread is machined on the outer surface of the boss, which matches the thread of the stripping groove of the sub-cell mold. , the side wall of the bottom end is processed with an upper positioning slot, which is connected with the demoulding base 6; the shape of the upper surface of the demoulding base 6 is complementary to the positioning slot, and is placed on the installation position of the demoulding machine;

In this embodiment, the inner cylindrical mold 1, the positioning plate 2 and the cell mold 3 are all made of high-strength mold steel.

The integrated molding method of the composite corrugated sandwich cylinder of the present embodiment includes the following steps:

1) Use the acetone solution to clean the outer surface of the inner cylindrical mold 1 and the outer surface of each sub-cell mold, and then evenly apply the release agent on the outer surface in turn, and apply the sealing agent to the release groove of the sub-cell mold to seal the holes. ;

2) Cut the carbon fiber prepreg according to the required size;

3) On the outer sidewall of the cleaned inner cylindrical mold 1 and the outer sidewall of each sub-cell mold, respectively, as shown in Figures 8 and 9, in the figure, 7 represents the carbon fiber prepreg, and lay the cut carbon fiber prepreg. Two layers of biaxially oriented polypropylene film are wrapped on the laid carbon fiber prepreg;

4) The inner cylindrical mold 1 wrapped with the biaxially oriented polypropylene film and each sub-cell mold are placed in the autoclave, and semi-curing is carried out, the curing pressure is 2MPa, the curing temperature is 85 ° C, and the curing time is 1 hour;

5) After semi-curing, take out the semi-cured inner cylindrical mold 1 and each sub-cell mold from the autoclave, cool down to room temperature, and remove the biaxially oriented polypropylene film wrapped on the carbon fiber prepreg;

6) Mold installation:

a) Install the protrusion of the inner mold positioning structure 1-1 at one end of the inner cylindrical mold 1 opposite to the through hole of the positioning disk positioning structure 2-2 of a positioning disk 2, and install the inner mold detachable structure 1-2 with the positioning The position of the detachable structure of the plate is aligned, and the screws are sequentially passed through the installation holes of the detachable structure of the positioning plate and the installation groove of the detachable structure 1-2 of the inner mold, and a positioning plate 2 is installed in the semi-cured carbon fiber prepreg. One end face of the cylindrical mold 1;

b) the sub-cell molds with the cell mold positioning structures 4 at both ends are respectively installed on the positioning plate 2 through the positioning cell mold structures 2-1;

c) According to the method of step a), install another positioning plate 2 on the other end of the inner cylindrical mold 1;

d) The remaining sub-cell molds are placed on the outer sidewall of the inner cylindrical mold 1 semi-cured with carbon fiber prepreg accordingly, and the multi-group cell molds 3 are closely attached to the inner cylindrical mold 1 by using the viscosity of the carbon fiber prepreg surface. The outer side wall of , forms a circular ring;

e) winding two layers of biaxially oriented polypropylene film on the outer surface of the cell mold 3;

7) Put the installed mold in step 6) into the autoclave again, and carry out the second semi-curing, the pressure is 2MPa and the curing temperature is 85 ° C, and the curing time is 1 hour;

8) After semi-curing, the structure after the second semi-curing in step 7) is taken out from the autoclave, cooled to room temperature, and the wrapped biaxially oriented polypropylene film is removed;

9) Lay carbon fiber prepreg on the outer wall of the multi-group cell mold 3, and then wrap two layers of biaxially oriented polypropylene film on the outer surface of the carbon fiber prepreg, as shown in Figure 10;

10) Place in an autoclave for final curing, the curing pressure is 3MPa, the curing temperature is 125°C, and the curing time is 2 hours;

11) After curing, take it out from the autoclave, lower it to room temperature, remove the sealing agent in the demolding grooves of all sub-cell moulds, remove the inner cylindrical mould 1, and use the demoulding rod 5 to cooperate with the demoulding base 6 to pull out each mold. A sub-cell mold, removing the biaxially oriented polypropylene film, and then grinding the end face to obtain an integrally formed composite material corrugated sandwich cylinder.

Finally, it should be noted that the purpose of publishing the embodiments is to help further understanding of the present invention, but those skilled in the art can understand that various replacements and modifications can be made without departing from the spirit and scope of the present invention and the appended claims. It is possible. Therefore, the present invention should not be limited to the contents disclosed in the embodiments, and the scope of protection of the present invention shall be subject to the scope defined by the claims.

Claims (10)

1. An integrated molding die of a composite material corrugated interlayer cylinder, the composite material corrugated interlayer barrel comprises an inner panel, a trapezoidal corrugated core layer and an outer panel, and the cylindrical outer panel is coaxially sleeved outside the inner panel, Between the two is a trapezoidal corrugated core layer. The trapezoidal corrugated core layer includes a plurality of cells that are closely distributed in the center of symmetry. Each cell includes two sub-cells. The upper and lower bottoms are arc-shaped, the upper bottom of the trapezoid of one sub-cell is larger than the lower bottom, and the lower bottom of the trapezoid of the other sub-cell is larger than the upper bottom. It is characterized in that the integration of the composite material corrugated sandwich cylinder The forming mold includes: inner cylindrical mold, inner mold positioning structure, positioning hoisting shaft, inner mold detachable structure, positioning plate, positioning plate positioning structure, positioning plate detachable structure, positioning cell mold structure, cell mold, mold release groove , Cell mold positioning structure, demoulding rod and demoulding base; among them, The outer surface of the inner cylindrical mold is cylindrical, and the diameter of the cylinder is the inner diameter of the inner panel of the composite material corrugated sandwich cylinder; the center of the two end faces of the inner cylindrical mold is respectively provided with an inner mold positioning structure; the center of the inner mold positioning structure is set There is a positioning and hoisting shaft; on the two end faces of the inner cylindrical mold and around the positioning structure of the inner mold, there are a plurality of detachable structures of the inner mold that are symmetrically distributed in the center; The two positioning discs are of the same structure, and the positioning disc is flat; a positioning disc positioning structure is arranged in the center of the positioning disc, and the positioning disc positioning structure is complementary to the shape of the inner mold positioning structure; corresponding to the detachable structure of each inner mold , on the positioning plate and around the positioning structure of the positioning plate, there are a plurality of detachable structures of the positioning plate which are distributed symmetrically in the center; Distributed positioning cell mold structure; Corresponding to each group of cells of the composite corrugated sandwich cylinder, multiple groups of cell molds are provided, each group of cell molds includes two sub-cell molds, and the shapes of the two sub-cell molds are respectively the same as those of the two sub-cell molds. The shape of the inner space of each sub-cell is the same; in the center of the two end faces of each sub-cell mold, there are demolding grooves respectively; corresponding to the multiple positioning cell mold structures on the positioning plate, in the corresponding multiple The centers of both ends of each sub-cell mold are respectively provided with a cell mold positioning structure, and for the sub-cell mold provided with the cell mold positioning structure, the mold release groove is arranged on the center of the cell mold positioning structure; The shape of the demoulding rod is a cylinder, and the end face of the top is provided with a demoulding boss, which matches with the demoulding groove of the sub-cell mold, and a positioning groove is processed on the side wall of the bottom end, which is matched with the demoulding base; The upper surface of the demoulding base is complementary to the shape of the positioning slot, and is placed on the installation position of the demoulding machine, and the bottom end of the demoulding rod is fixed on the demoulding base through the positioning slot; Lay fiber prepreg on the outer sidewall of the inner cylindrical mold and the outer sidewall of each sub-cell mold, wrap two layers of biaxially oriented polypropylene film on the laid fiber prepreg for semi-curing; after semi-curing , remove the biaxially oriented polypropylene film wrapped on the fiber prepreg; the inner mold positioning structure on one end face of the inner cylindrical mold is relatively installed with the positioning disk positioning structure of a positioning disk, and the inner mold detachable structure and the positioning disk are installed. The positions of the detachable structures are aligned, and the mounting pieces pass through the detachable structure of the positioning plate and the corresponding detachable structure of the inner mold in turn, and install a positioning plate on one end face of the inner cylindrical mold with the semi-cured fiber prepreg; The sub-cell molds whose ends are respectively provided with the cell mold positioning structure are respectively installed on the positioning plate through the positioning cell mold structure; another positioning plate is installed; the remaining sub-cell molds with fiber prepreg are correspondingly It is installed on the outer side wall of the inner cylindrical mold with semi-cured fiber prepreg, and the multi-group cell molds with semi-cured fiber prepreg are closely attached to the outer side wall of the inner cylindrical mold to form an annular shape. Two layers of biaxially oriented polypropylene film are wound on the outer side wall of the outer wall for the second semi-curing; after semi-curing, the wrapped biaxially oriented polypropylene film is removed; after the second semi-curing, there are multiple groups of cells with fiber prepreg Fiber prepreg is laid on the outer side wall of the mold, and then two layers of biaxially oriented polypropylene film are wrapped on the outer surface of the fiber prepreg for curing; after curing, the inner cylindrical mold is removed, and the bottom end of the demoulding rod is passed through the positioning clip The groove is fixed on the demoulding base, and the demoulding boss at the top of the demolding rod matches the demolding groove of the sub-cell mold. Each sub-cell mold is drawn out, and finally the biaxially oriented polypropylene film is removed to obtain an integrated molding. composite corrugated sandwich cylinder. 2 . The integrated molding die of the composite corrugated sandwich cylinder according to claim 1 , wherein the inner cylindrical die, the positioning plate and the cell die are all made of steel. 3 . 3. The integrated molding die of the composite corrugated sandwich cylinder body as claimed in claim 1, wherein the positioning plate positioning structure corresponds to the inner mold positioning structure, and the positioning plate positioning structure is a through hole, and the inner mold positioning The structure is a boss; or, the positioning plate positioning structure is a boss, and the inner mold positioning structure is a corresponding groove; the inner mold detachable structure is an installation groove with an internal thread; the positioning plate detachable structure is a mounting hole, which has Internal thread; the mounting part is a screw; the detachable structure of the inner mold has the same aperture as the detachable structure of the positioning plate, each mounting hole is aligned with the corresponding mounting slot, and the screws pass through the mounting hole and the corresponding mounting slot in turn to locate the The plate is installed on the end face of the inner cylindrical mold; the cell mold positioning structure matches the shape of the positioning cell mold structure positioning cell mold structure; the positioning cell mold structure is a through hole, and the cell mold positioning structure is convex. If the positioning cell mold structure is a protrusion, the cell mold positioning structure is a groove. 4. the integrated molding die of composite material corrugated sandwich cylinder body as claimed in claim 1 is characterized in that, the length of each sub-cell mold is less than the length of cylindrical mold, so that the upper and lower end faces of sub-cell mold are not aligned with the positioning plate The surfaces are in contact and do not hinder the axial movement of the sub-cell mold to the inner cylindrical mold after being pressed. 5 . The integrated molding die for composite corrugated sandwich cylinder according to claim 4 , wherein the length of each sub-cell die is 1-2 mm smaller than the length of the inner cylindrical die. 6 . 6. The integrated molding die of the composite corrugated sandwich cylinder body according to claim 1, wherein the demolding groove of the sub-cell die is processed with an internal thread, and the demolding boss on the demolding rod has an inner thread. The outer surface is processed with external threads, which are matched and connected with the demoulding groove of the sub-cell mold. 7. The molding method of the integrated molding die of the composite corrugated sandwich cylinder body as claimed in claim 1, wherein the molding method comprises the following steps: 1) Clean the outer surface of the inner cylindrical mold and the outer surface of each sub-cell mold, and then evenly apply the release agent on the outer surface in turn, and apply the sealing agent to the release groove of the sub-cell mold to seal the holes; 2) Cut the fiber prepreg according to the required size; 3) Lay the cut fiber prepreg on the outer side wall of the cleaned inner cylinder mold and the outer side wall of each sub-cell mold, and wrap two layers of biaxially oriented polypropylene on the laid fiber prepreg film; 4) placing the inner cylindrical mold wrapped with the biaxially oriented polypropylene film and each sub-cell mold in an autoclave for semi-curing; 5) After semi-curing, take out the semi-cured inner cylindrical mold and each sub-cell mold from the autoclave, cool down to room temperature, and remove the biaxially oriented polypropylene film wrapped on the fiber prepreg; 6) Mold installation: a) Install the inner mold positioning structure on one end face of the inner cylindrical mold and the positioning disk positioning structure of a positioning disk relatively, and align the positions of the inner mold detachable structure and the positioning disk detachable structure, and pass the mounting parts in turn. The detachable structure of the positioning plate and the detachable structure of the inner mold, a positioning disk is installed on one end face of the inner cylindrical mold with the semi-cured fiber prepreg; b) installing the sub-cell molds with the cell mold positioning structures at both ends respectively on the positioning plate through the positioning cell mold structures; c) According to the method of step a), install another positioning plate at the other end of the inner cylindrical mold; d) Place the remaining sub-cell molds with fiber prepreg on the outer sidewall of the inner cylindrical mold with fiber prepreg, and the multi-group cell molds with fiber prepreg are used. The viscosity of the fiber prepreg surface is close to the outer side wall of the inner cylindrical mold, forming a circular ring; e) winding two layers of biaxially oriented polypropylene film on the outer surface of the cell mold; 7) Put the installed mold in step 6) into the autoclave again, and carry out the second semi-curing; 8) After the second semi-curing, the structure after the second semi-curing in step 7) is taken out from the autoclave, cooled to room temperature, and the wrapped biaxially oriented polypropylene film is removed; 9) laying fiber prepreg on the outer side wall of the multi-group cell mold with the fiber prepreg secondary semi-cured, and then wrapping two layers of biaxially oriented polypropylene film on the outer surface of the fiber prepreg; 10) Place in an autoclave for final curing; 11) After curing, take it out from the autoclave, bring it down to room temperature, remove the sealing agent in the demolding grooves of all sub-cell molds, remove the inner cylindrical mold, and fix the bottom end of the demoulding rod through the positioning grooves. On the demolding base, the demoulding boss at the top of the demolding rod matches the demolding groove of the sub-cell mold, pull out each sub-cell mold, remove the biaxially oriented polypropylene film, and then perform end face grinding to obtain an integrated Formed composite corrugated sandwich cylinder. 8 . The molding method according to claim 7 , wherein in step 4), the curing pressure inside the autoclave is 1-2 MPa, the curing temperature is 80-90° C., and the curing time is 1-2 hours. 9 . 9 . The molding method according to claim 7 , wherein in step 7), the curing pressure inside the autoclave is 1-2 MPa, the curing temperature is 80-90° C., and the curing time is 1-2 hours. 10 . 10. The molding method of claim 7, wherein in step 10), the curing pressure inside the autoclave is 2-3 MPa, the curing temperature is 120-130°C, and the curing time is 1.5-2 hours.

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