Diffusion section oblique winding method

Abstract

The invention provides an oblique winding method for a diffusion section. The oblique winding method comprises the following steps: preparing carbon fiber cloth or glass fiber cloth into prepreg cloth; according to the size required by the product, the oblique winding process of the product is simulated, the width and profile of the cloth belt in the winding process are calculated, and the length, width and curved surface deformation parameters of the cloth belt are confirmed as required; the prepreg cloth is cut and spliced according to the length, the width and the curved surface deformation of a designed cloth belt; winding the prepreg tape in a special winding device according to the shape characteristics of the prepreg tape to obtain a prepreg tape reel; the prepared prepreg tape reel is put into an oblique winding device to be obliquely wound on the surface of the corresponding core mold; and the installed prepreg tape chuck penetrates through a tension control device special for oblique winding, and winding is conducted on the fixed core mold through a pressing roller. The problems that oblique winding tension of the diffusion section is not evenly applied, cloth tape winding is not compact, and the number of wrinkles of the diffusion section is large are solved.

Description

Technical Field

[0001] The invention relates to the field of manufacturing composite material diffusion sections, and in particular to a diffusion section oblique winding method. Background Art

[0002] At present, the main methods for forming the diffusion section are overlapping tape winding, oblique tape winding and petal laying. The overlapping tape winding process is convenient for tape making, the winding process is simple and efficient, but the prepared diffusion section has low ablation resistance; the oblique winding process parameters are difficult to optimize, and the tape preparation is difficult, which will directly increase the cost, but winding at a certain angle will reduce the thermal conductivity of the composite material and increase the anti-scouring and anti-ablation properties; the petal laying is heavy and the process is very complicated, which is not conducive to large-scale production and the cost is also high. At present, the oblique tape winding technology has not been widely used in related fields in China, mainly because the tape making technology is immature and the winding process is slow. Therefore, in the stage of rapid development of high-performance rocket engines, it is of utmost importance to achieve uniform and stable oblique winding molding technology.

[0003] For the obliquely wound diffusion section, there are currently problems such as uneven tension application, loose tape winding, and many wrinkles in the diffusion section, which is not conducive to improving the comprehensive performance of the diffusion section. The obliquely wound tape is cut into segments from plain cloth at 45°, and the tapes are spliced ​​and rolled up. The spliced ​​parts of the tapes are connected by sewing, which is cumbersome to operate. Then the rolled tape is put into the winding machine, and the tape is spread into a fan shape by the conical roller. During the winding process, due to the different linear speeds of the inner and outer conical rollers, the part of the tape with a larger linear speed is stretched, and the tape may break. At the same time, the wrinkles in the winding process cannot be further controlled, the winding is difficult, and the quality of the prepared diffusion section is difficult to guarantee. This field urgently needs the development of new processes and new winding methods. Summary of the invention

[0004] The present invention provides a method for oblique winding of a diffusion section, which solves the problems of uneven application of oblique winding tension of a nozzle diffusion section, loose winding of a cloth belt, and many wrinkles in the diffusion section, which is not conducive to improving the comprehensive performance of the diffusion section.

[0005] Based on this, the present invention provides a diffusion section oblique winding method, comprising the following steps:

[0006] S1: preparing carbon fiber cloth or glass fiber cloth into prepreg cloth;

[0007] S2: According to the required size of the product, simulate the oblique winding process of the product, expand and calculate the width and profile of the tape during the winding process, and confirm the tape length, width and surface deformation parameters as needed;

[0008] S3: cutting and splicing the prepreg in S1 according to the length, width and curved surface deformation of the designed fabric tape in S2;

[0009] S4: The prepreg tape in S3 is rolled up in a special winding device according to its shape characteristics to obtain a prepreg tape reel;

[0010] S5: placing the prepreg tape reel prepared in step S4 into an oblique winding device and performing oblique winding on the surface of the corresponding mandrel;

[0011] S6: During the winding process, the prepreg tape cartridge installed in step S5 is passed through a special tension control device for oblique winding, and is wound on a fixed core mold using a clamping roller.

[0012] Furthermore, the carbon fiber cloth in S1 is 1K carbon fiber cloth, 3K carbon fiber cloth, 6K carbon fiber cloth, 12K carbon fiber cloth, 24K and above large tow carbon fiber cloth; the glass fiber cloth is plain weave fabric or satin weave fabric.

[0013] Furthermore, the length of the cloth tape in S2 is 1-100 mm, and the width is 10-100 mm.

[0014] Furthermore, the special-shaped surface tape in S3 is cut to a corresponding length as required according to the width of the fiber cloth, so that each section of the tape is made as long as possible within the limited width of the cloth, thereby reducing the number of splicing times.

[0015] Furthermore, the oblique winding tension control device in S5 is a deformable roller with variable inner and outer diameters, which adjusts the inner and outer diameters of the tension roller in real time according to the deformation of the cloth belt, so that the cloth belt and the tension roller have a larger contact area, so that the oblique winding tension can be accurately controlled.

[0016] Furthermore, the oblique winding pressure roller in S6 is a pressure roller with variable inner and outer diameters. According to the oblique winding angle and the profile change of the wound product during the winding process, the pressure degree between the pressure roller and the oblique winding product is ensured to achieve the winding process of the densely wound product.

[0017] The above one or more technical solutions of the present invention have at least one or more of the following technical effects:

[0018] The diagonal winding method of the diffusion section provided by the present invention greatly improves the winding quality of the diagonally wound product, reduces the formation of wrinkle defects in the diagonally wound product, realizes controllable tension during the diagonal winding process, increases the molding quality of the wound product, and improves the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 , diffusion section oblique winding flow chart. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments obtained. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention. Figure 1 shown.

[0021] A method for diagonally winding a diffusion section comprises the following steps:

[0022] S1: preparing carbon fiber cloth or glass fiber cloth into prepreg cloth, wherein the carbon fiber cloth is 1K carbon fiber cloth, 3K carbon fiber cloth, 6K carbon fiber cloth, 12K carbon fiber cloth, 24K and above large tow carbon fiber cloth; the glass fiber cloth is plain weave fabric or satin weave fabric;

[0023] S2: According to the required size of the product, simulate the oblique winding process of the product, expand and calculate the width and profile of the tape during the winding process, and confirm the tape length, width and surface deformation parameters as needed. The tape length is 1-100mm and the width is 10-100mm;

[0024] S3: The prepreg in S1 is cut and spliced ​​according to the length, width and curved deformation of the tape designed in S2. The special-shaped tape is cut to the corresponding length according to the width of the fiber cloth. Within the limited width of the fabric, each tape section is made as long as possible to reduce the number of splicing times;

[0025] S4: The prepreg tape in S3 is rolled up in a special winding device according to its shape characteristics to obtain a prepreg tape reel;

[0026] S5: placing the prepreg reel prepared in step S4 into an oblique winding device and winding it obliquely on the surface of the corresponding mandrel. The oblique winding tension control device is a variable inner and outer diameter deformation roller. The inner and outer diameters of the tension roller are adjusted in real time according to the deformation amount of the fabric tape, so that the fabric tape and the tension roller have a larger contact area, so that the oblique winding tension can be accurately controlled.

[0027] S6: During the winding process, the prepreg tape chuck installed in step S5 is passed through a special tension control device for oblique winding, and is wound on a fixed core mold using a pressure roller. The oblique winding pressure roller is a pressure roller with variable inner and outer diameters. The degree of pressure between the pressure roller and the oblique winding product is ensured according to the oblique winding angle and the surface changes of the wound product during the winding process, so as to achieve a winding process of a densely wound product.

Claims

1. A diffusing section oblique winding method, characterized in that: The steps include: S1: preparing carbon fiber cloth or glass fiber cloth into prepreg cloth; S2: According to the required size of the product, simulate the oblique winding process of the product, expand and calculate the width and profile of the tape during the winding process, and confirm the tape length, width and surface deformation parameters as needed; S3: cutting and splicing the prepreg in S1 according to the length, width and curved surface deformation of the designed fabric tape in S2; S4: The prepreg tape in S3 is rolled up in a special winding device according to its shape characteristics to obtain a prepreg tape reel; S5: placing the prepreg tape reel prepared in step S4 into an oblique winding device and performing oblique winding on the surface of the corresponding mandrel; S6: During the winding process, the prepreg tape cartridge installed in step S5 is passed through a special tension control device for oblique winding, and is wound on a fixed core mold using a clamping roller.

2. The diagonal winding method of the diffusion section according to claim 1, characterized in that: The carbon fiber cloth in S1 is 1K carbon fiber cloth, 3K carbon fiber cloth, 6K carbon fiber cloth, 12K carbon fiber cloth, 24K and above large tow carbon fiber cloth; the glass fiber cloth is plain weave fabric or satin weave fabric.

3. The diffusing section oblique winding method according to claim 1, characterized in that: The length of the cloth tape in S2 is 1-100 mm, and the width is 10-100 mm.

4. The diagonal winding method of the diffusion section according to claim 1, characterized in that: The special-shaped surface tape in S3 is cut to a corresponding length as required according to the width of the fiber cloth, and each section of the tape is made as long as possible within the limited width of the cloth to reduce the number of splicing times.

5. The diagonal winding method of the diffusion section according to claim 1, characterized in that: The oblique winding tension control device in S5 is a variable inner and outer diameter deformation roller, which adjusts the inner and outer diameters of the tension roller in real time according to the deformation of the fabric tape, so that the fabric tape and the tension roller have a larger contact area, so that the oblique winding tension can be accurately controlled.

6. The diagonal winding method of the diffusion section according to claim 1, characterized in that: The oblique winding pressure roller in S6 is a pressure roller with variable inner and outer diameters. According to the oblique winding angle and the profile change of the wound product during the winding process, the pressure degree between the pressure roller and the oblique winding product is ensured to achieve a winding process of a densely wound product.

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