Autoclave forming method for large-curvature variable-thickness rear edge strip

Abstract

The autoclave forming method for the large-curvature variable-thickness rear edge strip comprises the following steps that raw materials are prepared; preparing a forming male mold; blanking prepreg strips with different sizes; prepreg is laid on the laying surface of the forming male mold according to the laying layer design, laying layers are laid in the direction from the large head end to the small head end during laying, and the thickness of the laying layers is gradually reduced; arranging a vacuum system; the forming male mold is transferred into an autoclave for pre-compaction; a lateral baffle is installed on the forming male mold, the contact face of the lateral baffle and the prepreg blank is coated with a release agent, and a vacuum system is arranged; the forming male mold is transferred into an autoclave for final curing; demolding is conducted; by means of the method, the large-curvature variable-thickness rear edge strip can be prepared, the preparation cost is low, and a complex mold structure is not needed.

Description

Technical Field

[0001] The invention relates to the technical field of composite material blade preparation, in particular to a hot-pressing tank forming method for a trailing edge strip with large curvature and variable thickness. Background Art

[0002] The trailing edge strip is one of the key components of the wing composite material structure. In the prior art, an invention patent entitled "A method for manufacturing a solid composite material edge strip preform" is disclosed, with a publication date of 2019.04.12 and a publication number of CN 109605777 A. The method for making the edge strip preform is to divide it into two parts, that is, to divide it into an upper part of the edge strip preform and a lower part of the edge strip preform by the midline of the cross section of the edge strip preform. When forming the edge strip parts, the upper part of the edge strip preform and the lower part of the edge strip preform are spliced, placed in a corresponding forming mold, and matched with the skin preform in place. The forming method is: integrally forming by RTM process, or co-curing by autoclave process, or co-gluing forming. It is only suitable for the forming of trailing edge strips with small curvature changes and relatively straight baffles. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above and / or existing problems in the preparation of existing ship cabin outer plates, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a hot press forming method for a trailing edge strip with large curvature and variable thickness. The present invention has a simple forming process, reduces the preparation cost, and does not require the use of large-scale equipment for hot press forming.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a hot-pressing tank forming method of a trailing edge strip with large curvature and variable thickness, comprising the following steps: 1. Raw materials preparation; 2. Preparation of the male mold; 3. Cutting prepreg strips of different sizes; 4. Lay the prepreg on the paving surface of the forming male mold according to the ply design. Lay the layers from the large end to the small end, and the ply thickness gradually decreases. The direction from the large end to the small end is the length direction of the paving surface. 5. Arrange a vacuum system on the forming male mold; 6. Transfer the formed male mold into the autoclave for pre-compaction; 7. Install a lateral baffle on the forming male mold, apply a release agent on the contact surface between the lateral baffle and the prepreg blank, and arrange a vacuum system on the forming male mold; 8. Transfer the formed male mold to the autoclave for final curing; 9. Demoulding.

[0007] As a preferred solution of the hot-pressing tank forming method of the trailing edge strip with large curvature and variable thickness in the present invention, wherein: in step 6, the specific process of pre-compacting is to heat at a rate of 0.5℃ / min-2.0℃ / min, and after the fastest heating thermocouple is heated to 40℃, the part begins to be pressurized, and when the pressure rises to 0.6±0.02MPa, the pressure is constant; the medium temperature is set to 90℃, and when the slowest heating thermocouple is heated to 85℃, it is kept warm for 1h; the pressure is released after cooling to below 50℃ at a rate of no more than 1.5℃ / min, and the can can be opened after the temperature of the fastest cooling thermocouple drops to below 45℃.

[0008] As a preferred solution of the autoclave forming method of the trailing edge strip with large curvature and variable thickness in the present invention, wherein: in step 8, during paving, the specific process of final curing is to heat at a rate of 0.5°C / min-2.0°C / min, and after the fastest heating thermocouple is heated to 40°C, the parts begin to be pressurized, and when the pressure rises to 0.6±0.02MPa, the pressure is constant; the medium temperature is set to 90°C, and when the slowest heating thermocouple is heated to 85°C, it is kept warm for 1h; after the pressure is raised to 0.8±0.02MPa, the pressure is constant; the medium temperature is set to 135°C, and when the slowest heating thermocouple is heated to 130°C, it is kept warm for 2h; the pressure is released after cooling to below 50°C at a rate of no more than 1.5°C / min, and the can can be opened after the temperature of the fastest cooling thermocouple drops to below 45°C.

[0009] As a preferred solution of the autoclave forming method of the trailing edge strip with large curvature and variable thickness in the present invention, the specific process of arranging the vacuum system is to first evenly place the adhesive tape, isolation film and breathable felt on the surface of the prepreg blank in sequence, and then use the sealing tape and vacuum bag film to seal the mold as a whole, and test the air tightness of the vacuum bag film: the vacuum degree is required to be less than -0.095MPa.

[0010] As a preferred solution of the autoclave forming method of the trailing edge strip with large curvature and variable thickness in the present invention, the direction from the large head end to the small head end is from left to right, the paving surface of the forming male mold is divided into 5 sections, the section where the large head end is located is the AA section, and the BB section, CC section, DD section and EE section are arranged in sequence between the AA and the small head end sections.

[0011] As a preferred solution of the autoclave forming method of the trailing edge strip with large curvature and variable thickness in the present invention, wherein: in step 4, the specific process of layering is as follows: 401. Perform 16 cycles of paving, each cycle of paving is to lay 5 strips of material from the back to the front, the starting position of the 5 strips of material in the left-right direction is the AA section, and the end position is the small end face, lay the 6th strip of material behind the 5 strips of material, the starting position of the 6th strip of material in the left-right direction is the AA section, and the end position of the 6th strip of material in the left-right direction is the EE section, lay the 7th strip of material behind the 6th strip of material, the starting position of the 7th strip of material in the left-right direction is the AA section, and the end position of the 7th strip of material in the left-right direction is the DD section, lay the 8th strip of material behind the 7th strip of material, the starting position of the 8th strip of material in the left-right direction is the AA section, and the end position of the 8th strip of material in the left-right direction is the CC section, lay the 9th strip of material behind the 8th strip of material, the starting position of the 9th strip of material in the left-right direction is the AA section, and the end position of the 9th strip of material in the left-right direction is the BB section; 402. 24 cycles of laying are performed on the upper side of the 16-layer prepreg. The process of each cycle of laying is to lay 3 strips of material from the back to the front in sequence. The starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the small head end. The fourth strip of material is laid on the back side of the 3 strips of material. The starting position of the fourth strip of material in the left-right direction is the AA section, and the end position of the fourth strip of material in the left-right direction is the EE section. The fifth strip of material is laid on the back side of the fourth strip of material. The fifth strip of material is laid. The starting position of the strip in the left-right direction is the AA section, the end position of the 5th strip in the left-right direction is the DD section, the 6th strip is laid behind the 5th strip, the starting position of the 6th strip in the left-right direction is the AA section, the end position of the 6th strip in the left-right direction is the CC section, 3 strips are laid in sequence from the back to the front behind the 6th strip, when laying the last 3 strips, the starting position in the left-right direction is the AA section, and the end position in the left-right direction is the BB section; 403. 3 cycles of laying are performed on the upper side of the 40 layers of laid prepreg. The process of each cycle of laying is to lay 4 strips of material in sequence from the back to the front, the starting position of the 4 strips of material in the left-right direction is the AA section, and the end position is the EE section. The 5th strip of material is laid behind the 4 strips of material, the starting position of the 5th strip of material in the left-right direction is the AA section, and the end position of the 4th strip of material in the left-right direction is the DD section. The 6th strip of material is laid behind the 5th strip of material, the starting position of the 6th strip of material in the left-right direction is the AA section, and the end position of the 6th strip of material in the left-right direction is the CC section. 3 strips of material are laid in sequence from the back to the front behind the 6th strip of material, the starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the BB section. 404. Perform 2 cycles of paving on the upper side of the 43-layer prepreg, each cycle of paving is to lay 5 strips of material from the back to the front, the starting position of the 5 strips of material in the left-right direction is the AA section, and the end position is the DD section, lay the 6th strip of material behind the 5 strips of material, the starting position of the 6th strip of material in the left-right direction is the AA section, and the end position of the 4th strip of material in the left-right direction is the CC section, lay 3 strips of material behind the 6th strip of material from the back to the front, the starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the BB section; 405. Lay the 46th layer of prepreg on the upper side of the 45th layer of prepreg, lay 6 strips of material in sequence from back to front, the starting position of the 6 strips of material in the left-right direction is the AA section, and the end position is the CC section, lay the 7th strip of material behind the 6th strip of material, the starting position of the 7th strip of material in the left-right direction is the AA section, and the end position is the BB section; 406. Perform 3 cycles of laying on the upper side of the 47th layer of prepreg, wherein each cycle of laying is to lay 9 strips of material in sequence from the rear side of the baffle bar to the rear, and the starting position of the 9 strips of material in the left-right direction is the AA section, and the ending position is the BB section; 407. Perform three cycles of laying on the upper side of the 50th layer of prepreg, and the process of each cycle of laying is as follows: lay the first strip of material from the rear side of the baffle to the rear, the starting position of the first strip of material in the left-right direction is the AA section, and the end position is the small head end; lay the second strip of material on the rear side of the first strip of material, the starting position of the second strip of material in the left-right direction is the AA section, and the end position is the EE section; lay the third strip of material on the rear side of the second strip of material, the starting position of the third strip of material in the left-right direction is the AA section, and the end position is the DD section; lay two strips of material in sequence from the rear to the front on the rear side of the third strip of material, the starting position of the two strips of material in the left-right direction is the AA section, and the end position is the CC section; lay three strips of material in sequence from the rear side of the fifth strip of material from the rear to the front, the starting position of the three strips of material in the left-right direction is the AA section, and the end position is the BB section; 408. Perform 7 cycles of laying on the upper side of the 53rd layer of prepreg; 409. 19 cycles of laying are performed on the upper side of the 60th layer of prepreg; 410. Perform 6 cycles of laying on the upper side of the 79th layer of prepreg; 411. Lay a layer of prepreg on the upper side of the 85th layer of prepreg; 412. 13 cycles of laying are performed on the upper side of the 86th layer of prepreg; 413. Perform 12 cycles of laying on the upper side of the 98th layer of prepreg; 414. Perform 5 cycles of laying on the upper side of the 110th layer of prepreg; 415. Lay a layer of prepreg on the upper side of the 115th layer of prepreg; 416. Perform 20 cycles of laying on the upper side of the 116th layer of prepreg; 417. Perform 12 cycles of laying on the upper side of the 136th layer of prepreg; 418. Perform 5 cycles of laying on the upper side of the 148th layer of prepreg; 419. Lay a layer of prepreg on the upper side of the 153rd layer of prepreg; 420. Perform 45 cycles of laying on the upper side of the 154th layer of prepreg; 421. 169 cycles of laying are performed on the upper side of the 199th layer of prepreg; 422. Perform 7 cycles of laying on the upper side of the 368th layer of prepreg to complete the laying of the prepreg; In the above steps, the front side of the first material strip of each layer is attached to the rear side of the stop strip of the forming male mold.

[0012] As a preferred solution of the autoclave forming method of the trailing edge strip with large curvature and variable thickness in the present invention, wherein: in step 4, the prepreg thickness is pre-compacted in the autoclave once every time it increases by 9 to 10 mm; and a vacuum compaction treatment is performed once every 6 layers are laid.

[0013] As a preferred solution of the autoclave forming method of the trailing edge strip with large curvature and variable thickness in the present invention, wherein: in step 408, the process of each paving cycle is to pave 2 strips of material from the rear side of the baffle strip to the rear in sequence, the starting positions of the 2 strips of material in the left and right directions are both AA sections, and the end positions are EE sections, 1 strip of material is pave behind the 2nd strip of material, the starting position of the 3rd strip of material in the left and right directions is AA section, and the end position is DD section, 2 strips of material are pave behind the 3rd strip of material, the starting positions of the 2 strips of material in the left and right directions are both AA sections, and the end positions are CC sections, 3 strips of material are pave forward in sequence behind the 5th strip of material, and the 3 strips of material are pave forward in sequence on the left and right directions The upward starting position is the AA section, and the end position extends in the direction of the BB section; in step 409, the process of each paving cycle is to pave 3 strips of material from the back of the baffle bar to the back in sequence, and the starting positions of the 3 strips of material in the left and right directions are all the AA section, and the end positions extend in the direction of the EE section, and 2 strips of material are pave on the back of the 3rd strip of material, and the starting positions of the 2 strips of material in the left and right directions are the AA section, and the end positions are the CC section, and 3 strips of material are pave on the back of the 5th strip of material, and the starting positions of the 3 strips of material in the left and right directions are all the AA section, and the end positions are the BB section; in step 410, the process of each paving cycle is to pave 3 strips of material from the back of the baffle bar to the back in sequence, and the end positions are all the AA section. 8 strips of material are laid, and the starting positions of the 8 strips of material in the left-right direction are all AA sections, and the end positions extend in the direction of the BB section. In step 411, the process of laying a layer of prepreg is to lay 1 strip of material from the rear side of the baffle to the rear, and the starting position of the strip of material in the left-right direction is AA section, and the end position is EE section. 1 strip of material is laid forward from the rear side of the first strip of material, and the starting position of the second strip of material in the left-right direction is AA section, and the end position is DD section. 2 strips of material are laid forward in sequence from the rear side of the second strip of material, and the starting position of the 2 strips of material in the left-right direction is AA section, and the end position is CC section. 3 strips of material are laid forward in sequence from the rear side of the fourth strip of material. Lay 3 strips of material, the starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the BB section; in step 412, the process of each layer of cyclic paving is to lay 2 strips of material in sequence from the rear side of the baffle bar to the rear, the starting position of the 2 strips of material in the left-right direction is the AA section, and the end position extends in the direction of the DD section, and lay 2 strips of material in sequence from the rear side of the second strip of material to the front, the starting position of the 3rd and 4th strips of material in the left-right direction is the AA section, and the end position is the CC section, and lay 3 strips of material in sequence from the rear side of the 4th strip of material to the front, the starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the BB section;In step 413, the process of each layer of cyclic paving is to lay 4 strips of material in sequence from the back side of the baffle bar to the back, the starting position of the 4 strips of material in the left-right direction is the AA section, and the end position extends in the direction of the CC section, and 3 strips of material are laid in sequence from the back side of the 4th strip of material to the front, the starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the CC section; in step 414, the process of each layer of cyclic paving is to lay 7 strips of material in sequence from the back side of the baffle bar to the back, the starting position of the 7 strips of material in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 415, the paving process is to lay 1 strip of material from the back side of the baffle bar to the back, and 1 strip of material in the left-right direction is The starting position upward is the AA section, and the end position is the DD section. Two strips of material are laid in sequence from the rear side of the first strip of material to the front. The starting position of the two strips of material in the left and right directions is the AA section, and the end position is the CC section. Three strips of material are laid in sequence from the rear side of the third strip of material to the front. The starting position of the three strips of material in the left and right directions is the AA section, and the end position is the BB section. In step 416, the process of paving each layer in a cycle is to lay three strips of material in sequence from the rear side of the baffle bar to the rear. The starting position of the three strips of material in the left and right directions is the AA section, and the end position extends in the direction of the CC section. Three strips of material are laid in sequence from the rear side of the third strip of material to the front. The starting position of the paving of the 4th to 6th strips of material in the left and right directions is The AA section is the AA section, and the end position extends in the direction of the BB section; in step 417, the process of each layer of cyclic paving is to lay 6 strips of material in sequence from the back side of the baffle bar to the back, and the starting position of the 6 strips of material in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 418, the process of each layer of cyclic paving is to lay 6 strips of material in sequence from the back side of the baffle bar to the back, and the starting position of the 6 strips of material in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 419, the paving process is to lay 2 strips of material in sequence from the back side of the baffle bar to the back, and the starting position of the 2 strips of material in the left-right direction is the AA section, and the end position is the CC section, Three strips of material are laid in sequence from the rear side of the second strip of material to the front side, and the starting position of the three strips of material in the left-right direction is the AA section, and the end position is the BB section; in step 420, five strips of material are laid in sequence from the rear side of the baffle to the rear side, and the starting position of the five strips of material in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 421, five strips of material are laid in sequence from the rear side of the baffle to the rear side, and the starting position of the five strips of material in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 422, five strips of material are laid in sequence from the rear side of the baffle to the rear side, and the starting position of the five strips of material in the left-right direction is the AA section, and the end position is the BB section.;

[0014] As a preferred embodiment of the autoclave forming method of the trailing edge strip with large curvature and variable thickness in the present invention, wherein: in step 408, when laying the last three strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a first set distance; in step 409, when laying the first three strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a second set distance; in step 410, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a third set distance; in step 412, when laying the first two strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a fourth set distance; in step 413, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a fourth set distance In step 414, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the sixth set distance; in step 416, when the first three material strips are laid, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the seventh set distance; in step 417, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the eighth set distance; in step 418, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the ninth set distance; in step 420, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the tenth set distance; in step 421, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a set distance.

[0015] Compared with the prior art, the present invention has the following technical effects: the rear edge strip prepared in the present invention is a fully composite material part, the thickness of the large head end is much greater than the thickness of the small head end, the front side of the baffle of the molding male mold is relatively curved, and the prepreg is laid along the front side of the baffle, and the layer laying design and autoclave compaction process of the present invention are combined to prepare a rear edge strip with large curvature, variable thickness and relatively curved; the technical problems of weak bonding, debonding and the like that occur during the segmentation and curing of the composite material edge strip structure in the prior art are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 It is a schematic diagram of the structure divided into several sections for paving in the present invention.

[0017] Figure 2 The figure is a structural diagram of a trailing edge strip prepared using the present invention.

[0018] Figure 3 It is a three-dimensional structural diagram of the forming male mold in the present invention.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the trailing edge strip prepared by using the present invention.

[0020] In the figure: 100 is a forming male mold, and 101 is a stop bar. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0024] Example 1 Reference Figure 3 and Figure 4 , which is the first embodiment of the present invention, provides a method for hot-pressing a trailing edge strip with a large curvature and variable thickness, which can realize the preparation of a trailing edge strip with a large curvature and variable thickness and is relatively curved without the aid of a complex mold.

[0025] A method for forming a hot-pressed tank with a trailing edge strip having a large curvature and variable thickness, comprising the following steps: 1. Raw material preparation, mainly T700 grade unidirectional carbon fiber prepreg; 2. Prepare the male mold and degrease the mold; inspect the shape and size accuracy of the mold. Before paving, use absorbent cotton (or wiping paper) dipped in an appropriate amount of acetone to clean the surface of the mold until the gauze has no different color. Let it dry at room temperature for more than 15 minutes, then treat the paving surface with a release agent for at least 3 times, and then it can be paved after drying; 3. Cut prepreg strips of different sizes according to the cutting sheet design; 4. Lay the prepreg on the paving surface of the forming male mold according to the ply design. Lay the layers from the large end to the small end, and the ply thickness gradually decreases. The direction from the large end to the small end is the length direction of the paving surface. 5. Arrange the vacuum system on the forming male mold. Specifically, first place the adhesive tape, isolation film and breathable felt evenly on the surface of the prepreg blank, then use the sealing tape and vacuum bag film to seal the mold as a whole, and test the air tightness of the vacuum bag film: the vacuum degree is required to be less than -0.095MPa; 6. Transfer the forming positive mold to the autoclave for pre-compaction. The specific process is to heat up at a rate of 0.5℃ / min-2.0℃ / min. After the fastest heating thermocouple is heated to 40℃, the parts begin to be pressurized. When the pressure rises to 0.6±0.02MPa, the pressure is constant. The medium temperature is set to 90℃. When the slowest heating thermocouple is heated to 85℃, it is kept warm for 1h. After cooling to below 50℃ at a rate of no more than 1.5℃ / min, the pressure is released. When the temperature of the fastest cooling thermocouple drops below 45℃, the can can be opened. 7. Install lateral baffles on the forming male mold, apply release agent on the contact surface between the lateral baffles and the prepreg blank, and arrange a vacuum system on the forming male mold. Specifically, first place adhesive tape, isolation film and breathable felt evenly on the surface of the prepreg blank, and then use sealing tape and vacuum bag film to seal the mold as a whole, and test the air tightness of the vacuum bag film: the vacuum degree is required to be less than -0.095MPa; 8. Transfer the molded male mold to the autoclave for final curing. The specific process is: heat up at a rate of 0.5℃ / min-2.0℃ / min. After the fastest heating thermocouple is heated to 40℃, the parts begin to be pressurized. When the pressure rises to 0.6±0.02MPa, the pressure is constant; the medium temperature is set to 90℃, and when the slowest heating thermocouple is heated to 85℃, it is kept warm for 1h; after the pressure is raised to 0.8±0.02MPa, the pressure is constant; the medium temperature is set to 135℃, and when the slowest heating thermocouple is heated to 130℃, it is kept warm for 2h; cool to below 50℃ at a rate of no more than 1.5℃ / min, and then release the pressure. When the temperature of the fastest cooling thermocouple drops below 45℃, the can can be opened; 9. Demolding: remove the removable cloth, isolation film and breathable felt on the surface, and then use auxiliary materials such as sealing tape and vacuum bag film to remove all bolts fixing the lateral baffles; then use the demoulding pry bar to loosen the rear edge strip from the contact gap between the ends of the lateral baffles, and then slowly remove the lateral baffles from both ends to the middle, and finally use the demoulding pry bar and other tools to loosen the rear edge strip from the contact gap between the ends of the rear edge strip mold, and completely loosen the rear edge strip from the contact gap between the rear edge strip and the side of the rear edge strip mold; 10. Appearance inspection: Visually inspect the surface quality of composite rods to check whether there are pits, wrinkles, deformations, bumps, glue accumulation and stains on the surface of composite rods.

[0026] 11. Nondestructive testing: Ultrasonic testing is performed on composite rods to inspect the types and distribution of defects such as porosity, delamination, debonding, inclusions and looseness, and the area and scale of debonding defects on the trailing edge of the composite material. 12. Profile trimming: trim the length margin and forming burrs of the trailing edge strip as required; 13. Appearance inspection: weigh and record the blades, and inspect the three-dimensional forming of the trailing edge strips.

[0027] The direction from the big head end to the small head end is from left to right, and the forming male mold paving surface is divided into 5 sections. The section where the big head end is located is the AA section, and there are BB section, CC section, DD section and EE section between the AA section and the small head end section.

[0028] In step 4, the specific process of laying the layers is as follows: 401. Perform 16 layers of circular paving, and the process of circular paving of each layer is as follows: paving 5 strips of material from back to front in sequence, the starting position of the 5 strips of material in the left-right direction is the AA section, and the end position is the small end face; paving the 6th strip of material behind the 5 strips of material, the starting position of the 6th strip of material in the left-right direction is the AA section, and the end position of the 6th strip of material in the left-right direction is the EE section; paving the 7th strip of material behind the 6th strip of material, the starting position of the 7th strip of material in the left-right direction is the AA section, and the end position of the 7th strip of material in the left-right direction is the DD section; paving the 8th strip of material behind the 7th strip of material, the starting position of the 8th strip of material in the left-right direction is the AA section, and the end position of the 8th strip of material in the left-right direction is the CC section; paving the 9th strip of material behind the 8th strip of material, the starting position of the 9th strip of material in the left-right direction is the AA section, and the end position of the 9th strip of material in the left-right direction is the BB section; 402. On the upper side of the 16th layer of prepreg, 24 layers of cyclic paving are performed in sequence. The process of cyclic paving of each layer is to lay 3 strips of material from back to front in sequence. The starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the small head end. The 4th strip of material is laid on the back side of the 3 strips of material. The starting position of the 4th strip of material in the left-right direction is the AA section, and the end position of the 4th strip of material in the left-right direction is the EE section. The 5th strip of material is laid on the back side of the 4th strip of material. The 5th strip of material is laid. The starting position of the 5th strip in the left-right direction is the AA section, and the end position of the 5th strip in the left-right direction is the DD section. The 6th strip is laid behind the 5th strip. The starting position of the 6th strip in the left-right direction is the AA section, and the end position of the 6th strip in the left-right direction is the CC section. Three strips are laid in sequence from the back to the front behind the 6th strip. When laying the last three strips, the starting position in the left-right direction is the AA section, and the end position in the left-right direction is the BB section. 403. Perform 3 layers of cyclic paving in sequence on the upper side of the 40th layer of prepreg material. The process of cyclic paving of each layer is as follows: 4 strips are laid in sequence from back to front, the starting position of the 4 strips in the left-right direction is the AA section, and the end position is the EE section; the fifth strip is laid behind the 4 strips, the starting position of the fifth strip in the left-right direction is the AA section, and the end position of the fourth strip in the left-right direction is the DD section; the sixth strip is laid behind the fifth strip, the starting position of the sixth strip in the left-right direction is the AA section, and the end position of the sixth strip in the left-right direction is the CC section; 3 strips are laid in sequence from back to front behind the sixth strip, the starting position of the 3 strips in the left-right direction is the AA section, and the end position is the BB section; 404. Perform 2 layers of cyclic paving on the upper side of the 43rd layer of prepreg material. The process of each layer of cyclic paving is to lay 5 strips of material from back to front in sequence, the starting position of the 5 strips of material in the left-right direction is the AA section, and the end position is the DD section. Lay the 6th strip of material behind the 5 strips of material, the starting position of the 6th strip of material in the left-right direction is the AA section, and the end position of the 4th strip of material in the left-right direction is the CC section. Lay 3 strips of material behind the 6th strip of material from back to front in sequence, the starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the BB section. 405. Lay the 46th layer of prepreg on the upper side of the 45th layer of prepreg, lay 6 strips of material in sequence from back to front, the starting position of the 6 strips of material in the left-right direction is the AA section, and the end position is the CC section, lay the 7th strip of material behind the 6th strip of material, the starting position of the 7th strip of material in the left-right direction is the AA section, and the end position is the BB section; 406. Perform three cycles of laying on the upper side of the 47th layer of prepreg, and the process of each cycle of laying is to lay 9 strips of material in sequence from the rear side of the baffle bar to the back, and the starting position of the 9 strips of material in the left-right direction is the AA section, and the end position is the BB section; 407. Perform three cycles of laying in sequence on the upper side of the 50th layer of prepreg, and the process of each cycle of laying is as follows: lay the first strip of material from the rear side of the baffle to the rear, the starting position of the first strip of material in the left-right direction is the AA section, and the end position is the small head end; lay the second strip of material on the rear side of the first strip of material, the starting position of the second strip of material in the left-right direction is the AA section, and the end position is the EE section; lay the third strip of material on the rear side of the second strip of material, the starting position of the third strip of material in the left-right direction is the AA section, and the end position is the DD section; lay two strips of material in sequence from the rear to the front on the rear side of the third strip of material, the starting position of the two strips of material in the left-right direction is the AA section, and the end position is the CC section; lay three strips of material in sequence from the rear side of the fifth strip of material from the rear to the front, the starting position of the three strips of material in the left-right direction is the AA section, and the end position is the BB section; 408. Perform 7 cycles of laying on the upper side of the 53rd layer of prepreg; 409. 19 cycles of laying are performed on the upper side of the 60th layer of prepreg; 410. Perform 6 cycles of laying on the upper side of the 79th layer of prepreg; 411. Lay a layer of prepreg on the upper side of the 85th layer of prepreg; 412. 13 cycles of laying are performed on the upper side of the 86th layer of prepreg; 413. Perform 12 cycles of laying on the upper side of the 98th layer of prepreg; 414. Perform 5 cycles of laying on the upper side of the 110th layer of prepreg; 415. Lay a layer of prepreg on the upper side of the 115th layer of prepreg; 416. Perform 20 cycles of laying on the upper side of the 116th layer of prepreg; 417. Perform 12 cycles of laying on the upper side of the 136th layer of prepreg; 418. Perform 5 cycles of laying on the upper side of the 148th layer of prepreg; 419. Lay a layer of prepreg on the upper side of the 153rd layer of prepreg; 420. Perform 45 cycles of laying on the upper side of the 154th layer of prepreg; 421. 169 cycles of laying are performed on the upper side of the 199th layer of prepreg; 422. Perform 7 cycles of laying on the upper side of the 368th layer of prepreg to complete the laying of the prepreg; In step 408, the process of each paving cycle is to pave 2 strips of material from the back of the baffle bar to the back in sequence, the starting positions of the 2 strips of material in the left and right directions are both AA sections, and the end positions are EE sections, and 1 strip of material is pave behind the 2nd strip of material, the starting position of the 3rd strip of material in the left and right directions is AA section, and the end position is DD section, and 2 strips of material are pave behind the 3rd strip of material, the starting positions of the 2 strips of material in the left and right directions are both AA sections, and the end positions are CC sections, and 3 strips of material are pave forward in sequence behind the 5th strip of material, the starting positions of the 3 strips of material in the left and right directions are all AA sections, and the end positions extend in the direction of BB section; in step 409, the process of each paving cycle is to pave 2 strips of material from the back of the baffle bar to the back in sequence, the starting positions of the 3 strips of material in the left and right directions are all AA sections, and the end positions extend in the direction of BB section. Lay 3 strips of material, the starting positions of the 3 strips of material in the left-right direction are all AA sections, and the end positions extend in the direction of the EE section; lay 2 strips of material on the back side of the 3rd strip of material, the starting positions of the 2 strips of material in the left-right direction are AA sections, and the end positions are CC sections; lay 3 strips of material on the back side of the 5th strip of material, the starting positions of the 3 strips of material in the left-right direction are all AA sections, and the end positions are BB sections; in step 410, the process of each paving cycle is to lay 8 strips of material in sequence from the back side of the baffle bar to the back, the starting positions of the 8 strips of material in the left-right direction are all AA sections, and the end positions extend in the direction of the BB section; in step 411, the process of laying a layer of prepreg is to lay 1 strip of material from the back side of the baffle bar to the back, and ... The starting position of the strips of material in the left-right direction is the AA section, and the end is the EE section. A strip of material is laid forward from the rear side of the first strip of material. The starting position of the second strip of material in the left-right direction is the AA section, and the end is the DD section. Two strips of material are laid forward in sequence behind the second strip of material. The starting position of the two strips of material in the left-right direction is the AA section, and the end is the CC section. Three strips of material are laid forward in sequence behind the fourth strip of material. The starting position of the three strips of material in the left-right direction is the AA section, and the end is the BB section. In step 412, the process of each layer of cyclic paving is to lay two strips of material in sequence from the rear side of the baffle bar to the rear. The starting position of the two strips of material in the left-right direction is the AA section, and the end position is toward the D section. D section direction, 2 strips of material are laid in sequence from the rear side of the 2nd strip of material to the front side, the starting position of the 3rd and 4th strips of material in the left and right directions is the AA section, and the end position is the CC section, 3 strips of material are laid in sequence from the rear side of the 4th strip of material to the front side, the starting position of the 3 strips of material in the left and right directions is the AA section, and the end position is the BB section; in step 413, the process of paving each layer in a cycle is to lay 4 strips of material in sequence from the rear side of the baffle bar to the rear side, the starting position of the 4 strips of material in the left and right directions is the AA section, and the end position extends in the direction of the CC section, and 3 strips of material are laid in sequence from the rear side of the 4th strip of material to the front side, the starting position of the 3 strips of material in the left and right directions is the AA section, and the end position is CC section;In step 414, the process of each layer of cyclic paving is to lay 7 strips of material in sequence from the rear side of the baffle bar to the rear, the starting position of the 7 strips of material in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 415, the paving process is to lay 1 strip of material in sequence from the rear side of the baffle bar to the rear, the starting position of the 1 strip of material in the left-right direction is the AA section, and the end position is the DD section, and 2 strips of material are laid in sequence from the rear side of the first strip of material to the front, the starting position of the 2 strips of material in the left-right direction is the AA section, and the end position is the CC section, and 3 strips of material are laid in sequence from the rear side of the third strip of material to the front, and 3 strips of material are laid in sequence. The starting position of the material strip in the left-right direction is the AA section, and the end position is the BB section; in step 416, the process of each layer of cyclic paving is to lay 3 material strips in sequence from the back side of the baffle to the back, the starting position of the 3 material strips in the left-right direction is the AA section, and the end position extends in the direction of the CC section, and 3 material strips are laid in sequence from the back side of the 3rd material strip to the front, and the starting position of the 4th to 6th material strips in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 417, the process of each layer of cyclic paving is to lay 6 material strips in sequence from the back side of the baffle to the back, and the 6 material strips The starting position of paving in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 418, the process of each layer of cyclic paving is to lay 6 strips of material in sequence from the back side of the baffle bar to the back, and the starting position of the 6 strips of material in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 419, the paving process is to lay 2 strips of material in sequence from the back side of the baffle bar to the back, and the starting position of the 2 strips of material in the left-right direction is the AA section, and the end position is the CC section, and 3 strips of material are laid in sequence from the back side of the second strip of material to the front, and the 3 strips of material are laid in the left-right direction. The starting position of pasting is the AA section, and the end position is the BB section; in step 420, 5 strips of material are pasted in sequence from the back side of the baffle bar, and the starting position of the 5 strips of material in the left and right direction is the AA section, and the end position extends in the direction of the BB section; in step 421, 5 strips of material are pasted in sequence from the back side of the baffle bar, and the starting position of the 5 strips of material in the left and right direction is the AA section, and the end position extends in the direction of the BB section; in step 422, 5 strips of material are pasted in sequence from the back side of the baffle bar, and the starting position of the 5 strips of material in the left and right direction is the AA section, and the end position is the BB section. ;

[0029] In step 408, when laying the last three strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a first set distance; in step 409, when laying the first three strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a second set distance; in step 410, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a third set distance; in step 412, when laying the first two strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a fourth set distance; in step 413, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a fifth set distance; in step 414 , the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the sixth set distance; in step 416, when laying the first three strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the seventh set distance; in step 417, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the eighth set distance; in step 418, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the ninth set distance; in step 420, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the tenth set distance; in step 421, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the set distance.

[0030] In the above laying steps, the front side of the first material strip of each layer is attached to the rear side of the baffle strip of the forming male mold; the prepreg material is pre-compacted in an autoclave once every 9 to 10 mm increase in thickness; and a vacuum compaction treatment is performed once every 6 layers are laid.

[0031] The left and right directions in this application are parallel to Figure 3 The x direction in the figure is to the right, and the front-back direction is parallel to Figure 3 The y direction in the figure is the backward direction.

[0032] The rear edge strip of the all-composite component in this application is made of all-composite materials, ensuring high specific strength and light weight. The variable thickness design in which the thickness of the large end is much greater than that of the small end can better adapt to the stress distribution and enhance the overall strength of the structure. The front side of the baffle of the molding male mold is relatively curved, so that the prepreg is more in line with the curvature requirements of the part when it is laid, ensuring the quality of the ply. The ply design is combined with the autoclave process: the precise ply design and autoclave compaction process are used to ensure the uniformity and density of the composite material during the curing process, avoiding problems such as loose bonding and debonding. Through the above method, the structural integrity and reliability of the rear edge strip are ensured, and the potential problems caused by segmented curing are reduced. The continuity of the carbon fiber is maximized, unnecessary material waste is reduced, the utilization rate of raw materials is improved, and the manufacturing cost is reduced.

[0033] Example 2 like Figure 1 , Figure 2 and Figure 4 , which is the second embodiment of the present invention, and this embodiment provides a method for hot-pressing a trailing edge strip with large curvature and variable thickness, which further realizes the forming of a trailing edge strip of a specific size.

[0034] The trailing edge strip required to be prepared in this application is about 5040 mm long, with the thinnest thickness at the small end, which is about 5.03 mm, and the thickest thickness at the end is 46.02 mm.

[0035] In step 408, when laying the last three strips, the length of the prepreg of the next layer is 80mm shorter than the length of the prepreg of the previous layer; in step 409, when laying the first three strips, the length of the prepreg of the next layer is 50mm shorter than the length of the prepreg of the previous layer; in step 410, the length of the prepreg of the next layer is 300mm shorter than the length of the prepreg of the previous layer; in step 412, when laying the first two strips, the length of the prepreg of the next layer is 100mm shorter than the length of the prepreg of the previous layer; in step 413, the length of the prepreg of the next layer is 50mm shorter than the length of the prepreg of the previous layer; in step 414, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer. 420mm; in step 416, when laying the first three strips, the length of the prepreg of the next layer is 40mm shorter than that of the previous layer; in step 417, the length of the prepreg of the next layer is 70mm shorter than that of the previous layer; in step 418, the length of the prepreg of the next layer is 300mm shorter than that of the previous layer; in step 420, the length of the prepreg of the next layer is 10mm shorter than that of the previous layer; in step 421, the length of the prepreg of the next layer is 5mm shorter than that of the previous layer; when laying the last 6 layers of strips, with the help of the lateral pressing plate, fill the small gaps with 5mm wide flat and continuous prepreg strips.

[0036] The distance between section AA and section BB is 2000mm, the distance between section AA and section CC is 2600mm, the distance between section AA and section DD is 3400mm, and the distance between section AA and section EB is 4550mm.

[0037] This embodiment can realize hot-tank forming of a trailing edge strip having a longer size, a large curvature, a variable thickness and a relatively curved shape through a specific layer design and the compaction setting of the hot-tank.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A hot-pressing tank forming method for a trailing edge strip with large curvature and variable thickness, characterized in that: The following steps are included:

1. Raw materials preparation; 2. Preparation of the male mold; 3. Cutting prepreg strips of different sizes; 4. Lay the prepreg on the paving surface of the forming male mold according to the ply design. Lay the layers from the large end to the small end, and the ply thickness gradually decreases. The direction from the large end to the small end is the length direction of the paving surface.

5. Arrange a vacuum system on the forming male mold; 6. Transfer the formed male mold into the autoclave for pre-compaction; 7. Install a lateral baffle on the forming male mold, apply a release agent on the contact surface between the lateral baffle and the prepreg blank, and arrange a vacuum system on the forming male mold; 8. Transfer the formed male mold to the autoclave for final curing; 9. Demoulding.

2. The autoclave forming method of the trailing edge strip with large curvature and variable thickness according to claim 1, characterized in that: In step 6, the specific process of pre-compaction is to heat up at a rate of 0.5℃ / min-2.0℃ / min. After the fastest heating thermocouple is heated to 40℃, the parts begin to be pressurized. When the pressure rises to 0.6±0.02MPa, the pressure is constant; the medium temperature is set to 90℃, and when the slowest heating thermocouple is heated to 85℃, it is kept warm for 1h; the pressure is released after cooling to below 50℃ at a rate of no more than 1.5℃ / min, and the can can be opened after the temperature of the fastest cooling thermocouple drops below 45℃.

3. The autoclave forming method of the trailing edge strip with large curvature and variable thickness according to claim 1, characterized in that: During paving in step 8, the specific process of final curing is as follows: heating at a rate of 0.5℃ / min-2.0℃ / min. After the fastest heating thermocouple is heated to 40℃, the parts begin to be pressurized. When the pressure rises to 0.6±0.02MPa, the pressure is maintained constant. The medium temperature is set to 90℃. When the slowest heating thermocouple is heated to 85℃, it is kept warm for 1h. After the pressure is increased to 0.8±0.02MPa, the pressure is maintained constant. The medium temperature is set to 135℃. When the slowest heating thermocouple is heated to 130℃, it is kept warm for 2h. After cooling to below 50℃ at a rate of no more than 1.5℃ / min, the pressure is released. When the temperature of the fastest cooling thermocouple drops below 45℃, the can can be opened.

4. The autoclave forming method of a trailing edge strip with large curvature and variable thickness according to any one of claims 1 to 3, characterized in that: The specific process of arranging the vacuum system is to first evenly place the adhesive tape, isolation film and breathable felt on the surface of the prepreg blank in sequence, then use sealing tape and vacuum bag film to seal the entire mold, and test the air tightness of the vacuum bag film: the vacuum degree is required to be less than -0.095MPa.

5. The autoclave forming method of a trailing edge strip with large curvature and variable thickness according to any one of claims 1 to 3, characterized in that: The direction from the big head end to the small head end is from left to right, and the forming male mold paving surface is divided into 5 sections. The section where the big head end is located is the AA section, and there are BB section, CC section, DD section and EE section between AA and the small head end section.

6. The autoclave forming method of the trailing edge strip with large curvature and variable thickness according to claim 5, characterized in that: In step 4, the specific process of laying the layers is as follows:

401. Perform 16 cycles of paving, each cycle of paving is to lay 5 strips of material from the back to the front, the starting position of the 5 strips of material in the left-right direction is the AA section, and the end position is the small end face, lay the 6th strip of material behind the 5 strips of material, the starting position of the 6th strip of material in the left-right direction is the AA section, and the end position of the 6th strip of material in the left-right direction is the EE section, lay the 7th strip of material behind the 6th strip of material, the starting position of the 7th strip of material in the left-right direction is the AA section, and the end position of the 7th strip of material in the left-right direction is the DD section, lay the 8th strip of material behind the 7th strip of material, the starting position of the 8th strip of material in the left-right direction is the AA section, and the end position of the 8th strip of material in the left-right direction is the CC section, lay the 9th strip of material behind the 8th strip of material, the starting position of the 9th strip of material in the left-right direction is the AA section, and the end position of the 9th strip of material in the left-right direction is the BB section; 402. 24 cycles of laying are performed on the upper side of the 16-layer prepreg. The process of each cycle of laying is to lay 3 strips of material from the back to the front in sequence. The starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the small head end. The fourth strip of material is laid on the back side of the 3 strips of material. The starting position of the fourth strip of material in the left-right direction is the AA section, and the end position of the fourth strip of material in the left-right direction is the EE section. The fifth strip of material is laid on the back side of the fourth strip of material. The fifth strip of material is laid. The starting position of the strip in the left-right direction is the AA section, the end position of the 5th strip in the left-right direction is the DD section, the 6th strip is laid behind the 5th strip, the starting position of the 6th strip in the left-right direction is the AA section, the end position of the 6th strip in the left-right direction is the CC section, 3 strips are laid in sequence from the back to the front behind the 6th strip, when laying the last 3 strips, the starting position in the left-right direction is the AA section, and the end position in the left-right direction is the BB section; 403. 3 cycles of laying are performed on the upper side of the 40 layers of laid prepreg. The process of each cycle of laying is to lay 4 strips of material in sequence from the back to the front, the starting position of the 4 strips of material in the left-right direction is the AA section, and the end position is the EE section. The 5th strip of material is laid behind the 4 strips of material, the starting position of the 5th strip of material in the left-right direction is the AA section, and the end position of the 4th strip of material in the left-right direction is the DD section. The 6th strip of material is laid behind the 5th strip of material, the starting position of the 6th strip of material in the left-right direction is the AA section, and the end position of the 6th strip of material in the left-right direction is the CC section. 3 strips of material are laid in sequence from the back to the front behind the 6th strip of material, the starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the BB section.

404. Perform 2 cycles of paving on the upper side of the 43-layer prepreg, each cycle of paving is to lay 5 strips of material from the back to the front, the starting position of the 5 strips of material in the left-right direction is the AA section, and the end position is the DD section, lay the 6th strip of material behind the 5 strips of material, the starting position of the 6th strip of material in the left-right direction is the AA section, and the end position of the 4th strip of material in the left-right direction is the CC section, lay 3 strips of material behind the 6th strip of material from the back to the front, the starting position of the 3 strips of material in the left-right direction is the AA section, and the end position is the BB section; 405. Lay the 46th layer of prepreg on the upper side of the 45th layer of prepreg, lay 6 strips of material in sequence from back to front, the starting position of the 6 strips of material in the left-right direction is the AA section, and the end position is the CC section, lay the 7th strip of material behind the 6th strip of material, the starting position of the 7th strip of material in the left-right direction is the AA section, and the end position is the BB section; 406. Perform 3 cycles of laying on the upper side of the 47th layer of prepreg, wherein each cycle of laying is to lay 9 strips of material in sequence from the rear side of the baffle bar to the rear, and the starting position of the 9 strips of material in the left-right direction is the AA section, and the ending position is the BB section; 407. Perform three cycles of laying on the upper side of the 50th layer of prepreg, and the process of each cycle of laying is as follows: lay the first strip of material from the rear side of the baffle to the rear, the starting position of the first strip of material in the left-right direction is the AA section, and the end position is the small head end; lay the second strip of material on the rear side of the first strip of material, the starting position of the second strip of material in the left-right direction is the AA section, and the end position is the EE section; lay the third strip of material on the rear side of the second strip of material, the starting position of the third strip of material in the left-right direction is the AA section, and the end position is the DD section; lay two strips of material in sequence from the rear to the front on the rear side of the third strip of material, the starting position of the two strips of material in the left-right direction is the AA section, and the end position is the CC section; lay three strips of material in sequence from the rear side of the fifth strip of material from the rear to the front, the starting position of the three strips of material in the left-right direction is the AA section, and the end position is the BB section; 408. Perform 7 cycles of laying on the upper side of the 53rd layer of prepreg; 409. 19 cycles of laying are performed on the upper side of the 60th layer of prepreg; 410. Perform 6 cycles of laying on the upper side of the 79th layer of prepreg; 411. Lay a layer of prepreg on the upper side of the 85th layer of prepreg; 412. 13 cycles of laying are performed on the upper side of the 86th layer of prepreg; 413. Perform 12 cycles of laying on the upper side of the 98th layer of prepreg; 414. Perform 5 cycles of laying on the upper side of the 110th layer of prepreg; 415. Lay a layer of prepreg on the upper side of the 115th layer of prepreg; 416. Perform 20 cycles of laying on the upper side of the 116th layer of prepreg; 417. Perform 12 cycles of laying on the upper side of the 136th layer of prepreg; 418. Perform 5 cycles of laying on the upper side of the 148th layer of prepreg; 419. Lay a layer of prepreg on the upper side of the 153rd layer of prepreg; 420. Perform 45 cycles of laying on the upper side of the 154th layer of prepreg; 421. 169 cycles of laying are performed on the upper side of the 199th layer of prepreg; 422. Perform 7 cycles of laying on the upper side of the 368th layer of prepreg to complete the laying of the prepreg; In the above steps, the front side of the first material strip of each layer is attached to the rear side of the stop strip of the forming male mold.

7. The autoclave forming method of the trailing edge strip with large curvature and variable thickness as claimed in claim 6, characterized in that: In step 4, the prepreg thickness is pre-compacted in an autoclave once every 9 to 10 mm increase; and vacuum compaction is performed once every 6 layers.

8. The autoclave forming method of the trailing edge strip with large curvature and variable thickness according to claim 6, characterized in that: In step 408, the process of each paving cycle is to pave 2 strips of material from the back of the baffle bar to the back in sequence, the starting positions of the 2 strips of material in the left and right directions are both AA sections, and the end positions are EE sections, and 1 strip of material is pave behind the 2nd strip of material, the starting position of the 3rd strip of material in the left and right directions is AA section, and the end position is DD section, and 2 strips of material are pave behind the 3rd strip of material, the starting positions of the 2 strips of material in the left and right directions are both AA sections, and the end positions are CC sections, and 3 strips of material are pave forward in sequence behind the 5th strip of material, the starting positions of the 3 strips of material in the left and right directions are all AA sections, and the end positions extend in the direction of BB section; in step 409, the process of each paving cycle is to pave 2 strips of material from the back of the baffle bar to the back in sequence, the starting positions of the 3 strips of material in the left and right directions are all AA sections, and the end positions extend in the direction of BB section. Lay 3 strips of material, the starting positions of the 3 strips of material in the left-right direction are all AA sections, and the end positions extend in the direction of the EE section; lay 2 strips of material on the back side of the 3rd strip of material, the starting positions of the 2 strips of material in the left-right direction are AA sections, and the end positions are CC sections; lay 3 strips of material on the back side of the 5th strip of material, the starting positions of the 3 strips of material in the left-right direction are all AA sections, and the end positions are BB sections; in step 410, the process of each paving cycle is to lay 8 strips of material in sequence from the back side of the baffle bar to the back, the starting positions of the 8 strips of material in the left-right direction are all AA sections, and the end positions extend in the direction of the BB section; in step 411, the process of laying a layer of prepreg is to lay 1 strip of material from the back side of the baffle bar to the back, and ... The starting position of the strips of material in the left-right direction is the AA section, and the end is the EE section. A strip of material is laid forward from the rear side of the first strip of material. The starting position of the second strip of material in the left-right direction is the AA section, and the end is the DD section. Two strips of material are laid forward in sequence behind the second strip of material. The starting position of the two strips of material in the left-right direction is the AA section, and the end is the CC section. Three strips of material are laid forward in sequence behind the fourth strip of material. The starting position of the three strips of material in the left-right direction is the AA section, and the end is the BB section. In step 412, the process of each layer of cyclic paving is to lay two strips of material in sequence from the rear side of the baffle bar to the rear. The starting position of the two strips of material in the left-right direction is the AA section, and the end position is toward the D section. D section direction, 2 strips of material are laid in sequence from the rear side of the 2nd strip of material to the front side, the starting position of the 3rd and 4th strips of material in the left and right directions is the AA section, and the end position is the CC section, 3 strips of material are laid in sequence from the rear side of the 4th strip of material to the front side, the starting position of the 3 strips of material in the left and right directions is the AA section, and the end position is the BB section; in step 413, the process of paving each layer in a cycle is to lay 4 strips of material in sequence from the rear side of the baffle bar to the rear side, the starting position of the 4 strips of material in the left and right directions is the AA section, and the end position extends in the direction of the CC section, and 3 strips of material are laid in sequence from the rear side of the 4th strip of material to the front side, the starting position of the 3 strips of material in the left and right directions is the AA section, and the end position is CC section;In step 414, the process of each layer of cyclic paving is to lay 7 strips of material in sequence from the rear side of the baffle bar to the rear, the starting position of the 7 strips of material in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 415, the paving process is to lay 1 strip of material in sequence from the rear side of the baffle bar to the rear, the starting position of the 1 strip of material in the left-right direction is the AA section, and the end position is the DD section, and 2 strips of material are laid in sequence from the rear side of the first strip of material to the front, the starting position of the 2 strips of material in the left-right direction is the AA section, and the end position is the CC section, and 3 strips of material are laid in sequence from the rear side of the third strip of material to the front, and 3 strips of material are laid in sequence. The starting position of the material strip in the left-right direction is the AA section, and the end position is the BB section; in step 416, the process of each layer of cyclic paving is to lay 3 material strips in sequence from the back side of the baffle to the back, the starting position of the 3 material strips in the left-right direction is the AA section, and the end position extends in the direction of the CC section, and 3 material strips are laid in sequence from the back side of the 3rd material strip to the front, and the starting position of the 4th to 6th material strips in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 417, the process of each layer of cyclic paving is to lay 6 material strips in sequence from the back side of the baffle to the back, and the 6 material strips The starting position of paving in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 418, the process of each layer of cyclic paving is to lay 6 strips of material in sequence from the back side of the baffle bar to the back, and the starting position of the 6 strips of material in the left-right direction is the AA section, and the end position extends in the direction of the BB section; in step 419, the paving process is to lay 2 strips of material in sequence from the back side of the baffle bar to the back, and the starting position of the 2 strips of material in the left-right direction is the AA section, and the end position is the CC section, and 3 strips of material are laid in sequence from the back side of the second strip of material to the front, and the 3 strips of material are laid in the left-right direction. The starting position of pasting is the AA section, and the end position is the BB section; in step 420, 5 strips of material are pasted in sequence from the back side of the baffle bar, and the starting position of the 5 strips of material in the left and right direction is the AA section, and the end position extends in the direction of the BB section; in step 421, 5 strips of material are pasted in sequence from the back side of the baffle bar, and the starting position of the 5 strips of material in the left and right direction is the AA section, and the end position extends in the direction of the BB section; in step 422, 5 strips of material are pasted in sequence from the back side of the baffle bar, and the starting position of the 5 strips of material in the left and right direction is the AA section, and the end position is the BB section. ; 9. The autoclave forming method of the trailing edge strip with large curvature and variable thickness according to claim 8, characterized in that: In step 408, when laying the last three strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a first set distance; in step 409, when laying the first three strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a second set distance; in step 410, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a third set distance; in step 412, when laying the first two strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a fourth set distance; in step 413, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by a fifth set distance; in step 414 , the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the sixth set distance; in step 416, when laying the first three strips, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the seventh set distance; in step 417, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the eighth set distance; in step 418, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the ninth set distance; in step 420, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the tenth set distance; in step 421, the length of the prepreg of the next layer is shorter than the length of the prepreg of the previous layer by the set distance.

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