A method of autoclave forming a large-curvature variable-thickness trailing edge strip

Abstract

The application discloses a hot press tank forming method of a large-curvature variable-thickness trailing edge strip, and comprises the following steps: raw material preparation; forming male die preparation; blanking of pre-impregnated material strips with different sizes; pre-impregnated material is laid on the laying surface of the forming male die according to a laying design, and the laying direction is from the large-end end to the small-end end, and the laying thickness gradually decreases; a vacuum system is arranged; the forming male die is transferred into a hot press tank to perform pre-compaction; a lateral baffle is installed on the forming male die, a release agent is applied to the contact surface of the lateral baffle and the pre-impregnated material blank, and a vacuum system is arranged; the forming male die is transferred into the hot press tank to perform final solidification; and demolding is performed; the large-curvature variable-thickness trailing edge strip can be prepared by using the application, and the preparation cost is low, and a complex die structure is not needed.

Description

Technical Field

[0001] This invention relates to the field of composite material blade manufacturing technology, and in particular to a hot autoclave forming method for trailing edge strips with large curvature and variable thickness. Background Technology

[0002] The trailing edge strip is one of the key components of the composite material structure of the wing. In the prior art, an invention patent entitled "A Manufacturing Method of a Solid Composite Material Edge Strip Preform" was disclosed, with a publication date of April 12, 2019 and publication number CN 109605777 A. The manufacturing method of the edge strip preform is to divide it into two parts, namely, dividing it into an upper edge strip preform and a lower edge strip preform along the centerline of the edge strip preform cross section. When molding the edge strip part, the upper edge strip preform and the lower edge strip preform are spliced ​​together and placed into the corresponding molding mold to fit with the skin preform. The molding method is: integral molding by RTM process, or co-curing by autoclave process, or co-bonding. It is only suitable for the molding of trailing edge strips with small curvature changes and relatively straight strips. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

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

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

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for forming a hot autoclave strip with a large curvature and variable thickness, comprising the following steps:

[0007] 1. Raw material preparation;

[0008] 2. Preparation of the male mold;

[0009] 3. Cut prepreg strips of different sizes;

[0010] 4. Lay the prepreg on the surface of the molded male mold according to the layup design. When laying, lay the layers from the large end to the small end, and the thickness of the layers gradually decreases. The direction from the large end to the small end is the length direction of the layup surface.

[0011] 5. Arranging a vacuum system on the forming male mold;

[0012] 6. Transferring the forming male mold into a hot press tank to perform pre-compaction;

[0013] 7. Installing a lateral baffle on the forming male mold, coating a contact surface of the lateral baffle with the prepreg blank with a release agent, and arranging a vacuum system on the forming male mold;

[0014] 8. Transferring the forming male mold into a hot press tank to perform final curing;

[0015] 9. Demolding.

[0016] As a preferred scheme of the hot press tank forming method of the large-curvature variable-thickness trailing edge strip in the present application, in step 6, the specific process of pre-compaction is as follows: heating at a rate of 0.5-2.0°C / min, after the fastest heating thermocouple is heated to 40°C, the part starts to be pressurized, and when the pressure rises to 0.6±0.02 MPa, constant pressure is maintained; the medium temperature is set to 90°C, and when the slowest heating thermocouple is heated to 85°C, it is kept for 1 h; after cooling to below 50°C at a speed of not more than 1.5°C / min, the pressure is removed, and when the fastest cooling thermocouple temperature decreases to below 45°C, the tank can be opened.

[0017] As a preferred scheme of the hot press tank forming method of the large-curvature variable-thickness trailing edge strip in the present application, in step 8, during laying, the specific process of final curing is as follows: heating at a rate of 0.5-2.0°C / min, after the fastest heating thermocouple is heated to 40°C, the part starts to be pressurized, and when the pressure rises to 0.6±0.02 MPa, constant pressure is maintained; the medium temperature is set to 90°C, and when the slowest heating thermocouple is heated to 85°C, it is kept for 1 h; after the pressure is raised to 0.8±0.02 MPa, constant pressure is maintained; the medium temperature is set to 135°C, and when the slowest heating thermocouple is heated to 130°C, it is kept for 2 h; after cooling to below 50°C at a speed of not more than 1.5°C / min, the pressure is removed, and when the fastest cooling thermocouple temperature decreases to below 45°C, the tank can be opened.

[0018] As a preferred scheme of the hot press tank forming method of the large-curvature variable-thickness trailing edge strip in the present application, the specific process of arranging a vacuum system is as follows: first, place the glue absorbing cloth, the isolation film and the air permeable felt on the surface of the prepreg blank in sequence and uniformly, and then seal the whole mold using the sealing tape and the vacuum bag film, and detect the air tightness of the vacuum bag film: the vacuum degree is required to be less than -0.095 MPa.

[0019] As a preferred scheme of the hot press tank forming method of the large-curvature variable-thickness trailing edge strip in the present application, wherein: from the large end to the small end is from left to right, the forming male die laying surface is divided into five sections, the section at the large end is A-A section, and B-B section, C-C section, D-D section and E-E section are sequentially arranged between A-A section and the section at the small end.

[0020] As a preferred scheme of the hot press tank forming method of the large-curvature variable-thickness trailing edge strip in the present application, wherein: in step 4, the specific process of laying is that,

[0021] 401, 16 cycles of laying are performed, and the process of each cycle of laying is that, 5 strips are laid from back to front, the starting position of the 5 strips in the left-right direction is A-A section, and the end position is the small end surface, the 6th strip is laid behind the 5 strips, the starting position of the 6th strip in the left-right direction is A-A section, and the end position of the 6th strip in the left-right direction is E-E section, the 7th strip is laid behind the 6th strip, the starting position of the 7th strip in the left-right direction is A-A section, and the end position of the 7th strip in the left-right direction is D-D section, the 8th strip is laid behind the 7th strip, the starting position of the 8th strip in the left-right direction is A-A section, and the end position of the 8th strip in the left-right direction is C-C section, and the 9th strip is laid behind the 8th strip, the starting position of the 9th strip in the left-right direction is A-A section, and the end position of the 9th strip in the left-right direction is B-B section;

[0022] 402, 24 cycles of laying are performed on the upper side of the 16-layer laid prepreg, and the process of each cycle of laying is that, 3 strips are laid from back to front, the starting position of the 3 strips in the left-right direction is A-A section, and the end position is the small end, the 4th strip is laid behind the 3 strips, the starting position of the 4th strip in the left-right direction is A-A section, and the end position of the 4th strip in the left-right direction is E-E section, the 5th strip is laid behind the 4th strip, the starting position of the 5th strip in the left-right direction is A-A section, and the end position of the 5th strip in the left-right direction is D-D section, the 6th strip is laid behind the 5th strip, the starting position of the 6th strip in the left-right direction is A-A section, and the end position of the 6th strip in the left-right direction is C-C section, and the last 3 strips are laid from back to front, the starting position of the last 3 strips in the left-right direction is A-A section, and the end position of the last 3 strips in the left-right direction is B-B section;

[0023] 403. On the top of the 40 layers of prepreg, perform 3 cycles of laying. Each cycle is as follows: lay 4 strips from back to front, with the starting position of the 4 strips being AA section and the ending position being EE section. Lay the 5th strip behind the 4 strips, with the starting position of the 5th strip being AA section and the ending position of the 4th strip being DD section. Lay the 6th strip behind the 5th strip, with the starting position of the 6th strip being AA section and the ending position of the 6th strip being CC section. Lay 3 strips from back to front behind the 6th strip, with the starting position of the 3 strips being AA section and the ending position being BB section.

[0024] 404. On the top of the 43 layers of prepreg, perform two cycles of paving. Each cycle is as follows: 5 strips are laid from back to front, with the starting position of the 5 strips being AA section and the ending position being DD section. The 6th strip is laid behind the 5 strips, with the starting position of the 6th strip being AA section and the ending position of the 4th strip being CC section. 3 strips are laid from back to front behind the 6th strip, with the starting position of the 3 strips being AA section and the ending position being BB section.

[0025] 405. Lay the 46th layer of prepreg on the top side of the 45th layer of prepreg. Lay 6 strips from back to front. The starting position of the 6 strips in the left and right direction is AA section and the ending position is CC section. Lay the 7th strip behind the 6th strip. The starting position of the 7th strip in the left and right direction is AA section and the ending position is BB section.

[0026] 406. Three cycles of laying are performed on the upper side of the 47th layer of prepreg. Each cycle of laying is as follows: nine strips are laid sequentially from the back of the retaining strip to the back. The starting position of the nine strips in the left and right direction is the AA section, and the ending position is the BB section.

[0027] 407、On the upper side of the 50th layer of prepreg, 3 cycles of laying-up are carried out, and the process of each cycle of laying-up is as follows: the first strip is laid from the back side to the front side, the starting position of the first strip in the left-right direction is the A-A section, and the terminal position is the small end, the second strip is laid behind the first strip, the starting position of the second strip in the left-right direction is the A-A section, and the terminal position is the E-E section, the third strip is laid behind the second strip, the starting position of the third strip in the left-right direction is the A-A section, and the terminal position is the D-D section, two strips are laid from the back to the front in turn behind the third strip, the starting position of the two strips in the left-right direction is the A-A section, and the terminal position is the C-C section, and three strips are laid from the back to the front in turn behind the fifth strip, the starting position of the three strips in the left-right direction is the A-A section, and the terminal position is the B-B section;

[0028] 408、On the upper side of the 53rd layer of prepreg, 7 cycles of laying-up are carried out;

[0029] 409、On the upper side of the 60th layer of prepreg, 19 cycles of laying-up are carried out;

[0030] 410、On the upper side of the 79th layer of prepreg, 6 cycles of laying-up are carried out;

[0031] 411、On the upper side of the 85th layer of prepreg, one layer of prepreg is laid;

[0032] 412、On the upper side of the 86th layer of prepreg, 13 cycles of laying-up are carried out;

[0033] 413、On the upper side of the 98th layer of prepreg, 12 cycles of laying-up are carried out;

[0034] 414、On the upper side of the 110th layer of prepreg, 5 cycles of laying-up are carried out;

[0035] 415、On the upper side of the 115th layer of prepreg, one layer of prepreg is laid;

[0036] 416、On the upper side of the 116th layer of prepreg, 20 cycles of laying-up are carried out;

[0037] 417、On the upper side of the 136th layer of prepreg, 12 cycles of laying-up are carried out;

[0038] 418、On the upper side of the 148th layer of prepreg, 5 cycles of laying-up are carried out;

[0039] 419、On the upper side of the 153rd layer of prepreg, one layer of prepreg is laid;

[0040] 420、On the upper side of the 154th layer of prepreg, 45 cycles of laying-up are carried out;

[0041] 421、On the upper side of the 199th layer of prepreg, 169 cycles of laying-up are carried out;

[0042] 422、In the first 368 layer pre-preg on the side of 7 cycles of laying, the completion of the laying of the pre-preg;

[0043] In the above steps, the first material strip of each layer is attached to the back side of the blocking strip of the forming male mold.

[0044] As a preferred scheme of the autoclave forming method of the large-curvature variable-thickness trailing edge strip in the application, wherein: in step 4, the pre-preg is pre-pressed by the autoclave every time the thickness increases by 9-10 mm; and every 6 layers are laid, 1 vacuum compaction treatment is performed.

[0045] As a preferred scheme of the autoclave forming method of the large-curvature variable-thickness trailing edge strip in the present application, in step 408, the process of laying each cycle is as follows: two strips are laid from the back side of the blocking strip to the back side in turn, the starting positions of the two strips in the left-right direction are both A-A sections, and the terminal positions are E-E sections, one strip is laid at the back side of the second strip, the starting position of the third strip in the left-right direction is A-A section, and the terminal position is D-D section, two strips are laid at the back side of the third strip, the starting positions of the two strips in the left-right direction are both A-A sections, and the terminal positions are C-C sections, three strips are laid from the back side of the fifth strip to the front side in turn, the starting positions of the three strips in the left-right direction are all A-A sections, and the terminal positions extend towards the direction of B-B section; in step 409, the process of laying each cycle is as follows: three strips are laid from the back side of the blocking strip to the back side in turn, the starting positions of the three strips in the left-right direction are all A-A sections, and the terminal positions extend towards the direction of E-E section, two strips are laid at the back side of the third strip, the starting positions of the two strips in the left-right direction are A-A sections, and the terminal positions are C-C sections, three strips are laid at the back side of the fifth strip, the starting positions of the three strips in the left-right direction are all A-A sections, and the terminal positions are B-B sections; in step 410, the process of laying each cycle is as follows: eight strips are laid from the back side of the blocking strip to the back side in turn, the starting positions of the eight strips in the left-right direction are all A-A sections, and the terminal positions extend towards the direction of B-B section; in step 411, the process of laying one layer of prepreg is as follows: one strip is laid from the back side of the blocking strip to the back side, the starting position of the strip in the left-right direction is A-A section, and the terminal position is E-E section, one strip is laid from the back side of the first strip to the front side, the starting position of the second strip in the left-right direction is A-A section, and the terminal position is D-D section, two strips are laid from the back side of the second strip to the front side in turn, the starting positions of the two strips in the left-right direction are both A-A sections, and the terminal positions are C-C sections, three strips are laid from the back side of the fourth strip to the front side in turn, the starting positions of the three strips in the left-right direction are all A-A sections, and the terminal positions are B-B sections; in step 412, the process of laying each cycle is as follows: two strips are laid from the back side of the blocking strip to the back side in turn, the starting positions of the two strips in the left-right direction are both A-A sections, and the terminal positions extend towards the direction of D-D section, two strips are laid from the back side of the second strip to the front side in turn, the starting positions of the third and fourth strips in the left-right direction are both A-A sections, and the terminal positions are C-C sections, three strips are laid from the back side of the fourth strip to the front side in turn, the starting positions of the three strips in the left-right direction are all A-A sections, and the terminal positions are B-B sections.In step 413, the process of each layer of the cycle laying is that 4 strips are laid from the back side of the blocking strip to the front side, the starting position of the 4 strips laid in the left-right direction is A-A section, and the end position extends to the direction of C-C section; 3 strips are laid from the back side of the fourth strip to the front side, the starting position of the 3 strips laid in the left-right direction is A-A section, and the end position is C-C section. In step 414, the process of each layer of the cycle laying is that 7 strips are laid from the back side of the blocking strip to the front side, the starting position of the 7 strips laid in the left-right direction is A-A section, and the end position extends to the direction of B-B section. In step 415, the laying process is that 1 strip is laid from the back side of the blocking strip to the front side, the starting position of the 1 strip laid in the left-right direction is A-A section, and the end position is D-D section; 2 strips are laid from the back side of the first strip to the front side, the starting position of the 2 strips laid in the left-right direction is A-A section, and the end position is C-C section; 3 strips are laid from the back side of the third strip to the front side, the starting position of the 3 strips laid in the left-right direction is A-A section, and the end position is B-B section. In step 416, the process of each layer of the cycle laying is that 3 strips are laid from the back side of the blocking strip to the front side, the starting position of the 3 strips laid in the left-right direction is A-A section, and the end position extends to the direction of C-C section; 3 strips are laid from the back side of the third strip to the front side, the starting position of the fourth to sixth strips laid in the left-right direction is A-A section, and the end position extends to the direction of B-B section. In step 417, the process of each layer of the cycle laying is that 6 strips are laid from the back side of the blocking strip to the front side, the starting position of the 6 strips laid in the left-right direction is A-A section, and the end position extends to the direction of B-B section. In step 418, the process of each layer of the cycle laying is that 6 strips are laid from the back side of the blocking strip to the front side, the starting position of the 6 strips laid in the left-right direction is A-A section, and the end position extends to the direction of B-B section. In step 419, the laying process is that 2 strips are laid from the back side of the blocking strip to the front side, the starting position of the 2 strips laid in the left-right direction is A-A section, and the end position is C-C section; 3 strips are laid from the back side of the second strip to the front side, the starting position of the 3 strips laid in the left-right direction is A-A section, and the end position is B-B section. In step 420, 5 strips are laid from the back side of the blocking strip to the front side, the starting position of the 5 strips laid in the left-right direction is A-A section, and the end position extends to the direction of B-B section. In step 421, 5 strips are laid from the back side of the blocking strip to the front side, the starting position of the 5 strips laid in the left-right direction is A-A section, and the end position extends to the direction of B-B section. In step 422, 5 strips are laid from the back side of the blocking strip to the front side, the starting position of the 5 strips laid in the left-right direction is A-A section, and the end position is B-B section.

[0046] As a preferred scheme of the autoclave forming method of the large-curvature variable-thickness trailing edge strip in the application, in step 408, when the last 3 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 a first set distance; in step 409, when the previous 3 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 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 the previous 2 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 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 a sixth set distance; in step 416, when the previous 3 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 a 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 an 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 a 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 a 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.

[0047] Compared with the prior art, the application has the following technical effects: the trailing edge strip prepared in the application is a full composite material part, the thickness of the large-end end is much larger than the thickness of the small-end end, the front side of the blocking strip of the forming male die is relatively curved, the prepreg is laid along the front side of the blocking strip, the large-curvature variable-thickness and relatively curved trailing edge strip is prepared by combining the lay-up design and the autoclave compaction process of the application; and the technical problems of the prior art, such as poor gluing and debonding, are solved. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor. Among them:

[0049] Figure 1 The structure diagram is divided into several sections for laying up in the application.

[0050] Figure 2 The structure diagram of the trailing edge strip prepared by using the application.

[0051] Figure 3 The three-dimensional structure diagram of the forming male die in the application.

[0052] Figure 4 A schematic diagram of the three-dimensional structure of the trailing edge strip prepared using the present application.

[0053] In the figure: 100, a forming male die; 101, a blocking strip. DETAILED DESCRIPTION

[0054] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0055] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0056] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is separate or alternative to other embodiments.

[0057] Embodiment 1

[0058] Reference Figure 3 and Figure 4 For the first embodiment of the present application, the embodiment provides a hot press tank forming method of a large-curvature variable-thickness trailing edge strip, which can realize the preparation of a large-curvature variable-thickness and relatively curved trailing edge strip without the aid of a complex mold.

[0059] A hot press tank forming method of a large-curvature variable-thickness trailing edge strip, comprising the following steps:

[0060] 1. Raw material preparation, mainly T700 unidirectional carbon fiber prepreg;

[0061] 2. Forming male die preparation, oil removal treatment is performed on the mold; the profile accuracy, dimensional accuracy and the like of the mold are inspected, and before laying, the surface is cleaned with acetone using degreasing cotton (or wiping paper) until the gauze has no color difference, and then the laying surface is treated with a release agent for at least 3 times, and after drying, it can be laid;

[0062] 3. According to the design of the blanking sheet, blanking of prepreg strips of different sizes is performed;

[0063] 4. According to the ply design, the prepreg is laid on the laying surface of the forming male mold, and the plies are laid from the big end to the small end, and the ply thickness gradually decreases from the big end to the small end, which is the length direction of the laying surface;

[0064] 5. The vacuum system is arranged on the forming male mold, specifically, the glue absorbing cloth, the isolation film and the air permeable felt are placed on the surface of the prepreg blank in turn, then the whole mold is sealed by using the sealing tape and the vacuum bag film, and the air tightness of the vacuum bag film is detected: the vacuum degree is required to be less than -0.095 MPa;

[0065] 6. The forming male mold is transferred into the hot press tank for pre-compaction, and the specific process is as follows: the temperature is raised at a rate of 0.5-2.0 ℃ / min, the fastest heating thermocouple is heated to 40 ℃, then the part starts to be pressurized, when the pressure rises to 0.6±0.02 MPa, the pressure is constant; the medium temperature is set to 90 ℃, when the slowest heating thermocouple is heated to 85 ℃, the temperature is kept for 1 h; the cooling speed is not more than 1.5 ℃ / min to 50 ℃ or below, then the pressure is removed, when the fastest cooling thermocouple temperature is reduced to 45 ℃ or below, the tank can be opened;

[0066] 7. The lateral baffle is installed on the forming male mold, the contact surface between the lateral baffle and the prepreg blank is coated with a release agent, and the vacuum system is arranged on the forming male mold, specifically, the glue absorbing cloth, the isolation film and the air permeable felt are placed on the surface of the prepreg blank in turn, then the whole mold is sealed by using the sealing tape and the vacuum bag film, and the air tightness of the vacuum bag film is detected: the vacuum degree is required to be less than -0.095 MPa;

[0067] 8. The forming male mold is transferred into the hot press tank for final curing, and the specific process is as follows: the temperature is raised at a rate of 0.5-2.0 ℃ / min, the fastest heating thermocouple is heated to 40 ℃, then the part starts to be pressurized, when the pressure rises to 0.6±0.02 MPa, the pressure is constant; the medium temperature is set to 90 ℃, when the slowest heating thermocouple is heated to 85 ℃, the temperature is kept for 1 h; the pressure is raised to 0.8±0.02 MPa, and the pressure is constant; the medium temperature is set to 135 ℃, when the slowest heating thermocouple is heated to 130 ℃, the temperature is kept for 2 h; the cooling speed is not more than 1.5 ℃ / min to 50 ℃ or below, then the pressure is removed, when the fastest cooling thermocouple temperature is reduced to 45 ℃ or below, the tank can be opened;

[0068] 9. Demolding: the surface of the prepreg blank is removed, and the isolation film and the air permeable felt are removed, then the sealing tape and the vacuum bag film and other auxiliary materials are used to remove all the bolts for fixing the lateral baffle; then the demolding lever is used to loosen the contact gap between the rear edge strip and the two ends of the lateral baffle, then the lateral baffle is removed slowly from both ends to the middle, finally the demolding lever and other tools are used to loosen the contact gap between the rear edge strip and the two ends of the rear edge strip mold, and the contact gap between the rear edge strip and the side surface of the rear edge strip mold is completely loosened.

[0069] 10. Appearance inspection: visually inspecting the surface quality of the composite rod, detecting whether the surface of the composite rod has pits, wrinkle deformation, scratch, glue accumulation and contamination, etc.

[0070] 11. Non-destructive testing: ultrasonic testing of the composite rod to detect the types and distribution of defects such as porosity, delamination, debonding, inclusion and porosity, debonding defect area and size, etc.

[0071] 12. Shaping: shaping the length allowance and forming burr of the trailing edge strip according to requirements;

[0072] 13. External shape detection: weighing the blade and detecting the three-dimensional shape of the trailing edge strip.

[0073] The direction from the large end to the small end is from left to right, and the forming male die is divided into five sections, the section at the large end is A-A section, and B-B section, C-C section, D-D section and E-E section are sequentially arranged between A-A section and the small end section.

[0074] In step 4, the specific process of laying is as follows:

[0075] 401. 16 layers of cycle laying are performed, and the process of each cycle laying is as follows: 5 strips are laid from back to front, the starting position of the 5 strips in the left-right direction is A-A section, and the end position is the small end face, the 6th strip is laid behind the 5 strips, the starting position of the 6th strip in the left-right direction is A-A section, and the end position of the 6th strip in the left-right direction is E-E section, the 7th strip is laid behind the 6th strip, the starting position of the 7th strip in the left-right direction is A-A section, and the end position of the 7th strip in the left-right direction is D-D section, the 8th strip is laid behind the 7th strip, the starting position of the 8th strip in the left-right direction is A-A section, and the end position of the 8th strip in the left-right direction is C-C section, the 9th strip is laid behind the 8th strip, the starting position of the 9th strip in the left-right direction is A-A section, and the end position of the 9th strip in the left-right direction is B-B section;

[0076] 402. On top of the 16th layer of prepreg, perform a 24-layer cyclic laying process. Each cyclic laying process involves laying 3 strips sequentially from back to front, with the starting position of the 3 strips being section AA and the ending position being the small end. Then, lay the 4th strip behind the 3 strips, with the starting position of the 4th strip also being section AA and the ending position being section EE. Finally, lay the 5th strip behind the 4th strip, and so on. The starting position of the 5 strips in the left-right direction is section AA, and the ending position of the 5th strip in the left-right direction is section DD. The 6th strip is laid behind the 5th strip. The starting position of the 6th strip in the left-right direction is section AA, and the ending position of the 6th strip in the left-right direction is section CC. Three strips are laid from back to front behind the 6th strip. When laying the last 3 strips, the starting position in the left-right direction is section AA, and the ending position in the left-right direction is section BB.

[0077] 403. On the top of the 40th layer of prepreg, lay 3 layers in a loop. The process of laying each layer is as follows: lay 4 strips from back to front, with the starting position of the 4 strips in the left-right direction being AA section and the ending position being EE section. Lay the 5th strip behind the 4 strips, with the starting position of the 5th strip in the left-right direction being AA section and the ending position of the 4th strip in the left-right direction being DD section. Lay the 6th strip behind the 5th strip, with the starting position of the 6th strip in the left-right direction being AA section and the ending position of the 6th strip in the left-right direction being CC section. Lay 3 strips from back to front behind the 6th strip, with the starting position of the 3 strips in the left-right direction being AA section and the ending position being BB section.

[0078] 404. On the top of the 43rd layer of prepreg, two layers are laid in a loop. The process of laying each layer is as follows: 5 strips are laid from back to front. The starting position of the 5 strips in the left and right direction is AA section and the ending position is DD section. The 6th strip is laid behind the 5 strips. The starting position of the 6th strip in the left and right direction is AA section and the ending position of the 4th strip in the left and right direction is CC section. 3 strips are laid from back to front behind the 6th strip. The starting position of the 3 strips in the left and right direction is AA section and the ending position is BB section.

[0079] 405. Lay the 46th layer of prepreg on the top side of the 45th layer of prepreg. Lay 6 strips from back to front. The starting position of the 6 strips in the left and right direction is AA section and the ending position is CC section. Lay the 7th strip behind the 6th strip. The starting position of the 7th strip in the left and right direction is AA section and the ending position is BB section.

[0080] 406. Three cycles of laying are carried out on the upper side of the 47th layer of prepreg. Each cycle of laying is carried out by laying 9 strips from the back of the baffle strip to the back. The starting position of the 9 strips in the left and right direction is the AA section and the ending position is the BB section.

[0081] 407. Three cycles of laying are performed on the top side of the 50th layer of prepreg. The process of laying each layer is as follows: the first strip is laid from the back of the retaining strip backwards. The starting position of the first strip in the left-right direction is the AA section and the ending position is the small end. The second strip is laid behind the first strip. The starting position of the second strip in the left-right direction is the AA section and the ending position is the EE section. The third strip is laid behind the second strip. The starting position of the third strip in the left-right direction is the AA section and the ending position is the DD section. Two strips are laid from back to front behind the third strip. The starting position of the two strips in the left-right direction is the AA section and the ending position is the CC section. Three strips are laid from back to front behind the fifth strip. The starting position of the three strips in the left-right direction is the AA section and the ending position is the BB section.

[0082] 408. Perform 7 cycles of paving on the top side of the 53rd layer of prepreg;

[0083] 409. Perform 19 cycles of laying on the top side of the 60th layer of prepreg;

[0084] 410. Six cycles of laying are performed on the top side of the 79th layer of prepreg;

[0085] 411. Lay a layer of prepreg on the upper side of the 85th layer of prepreg;

[0086] 412. Perform 13 cycles of paving on the upper side of the 86th layer of prepreg;

[0087] 413. Perform 12 cycles of paving on the top side of the 98th layer of prepreg;

[0088] 414. Five cycles of laying are performed on the top side of the 110th layer of prepreg;

[0089] 415. Lay a layer of prepreg on the upper side of the 115th layer of prepreg;

[0090] 416. Perform 20 cycles of paving on the top side of the 116th layer of prepreg;

[0091] 417. Perform 12 cycles of paving on the top side of the 136th layer of prepreg;

[0092] 418. Five cycles of laying are performed on the top side of the 148th layer of prepreg;

[0093] 419. Lay a layer of prepreg on the upper side of the 153rd layer of prepreg;

[0094] 420. 45 cycles of layup on the top side of the 154th ply of prepreg;

[0095] 421. 169 cycles of layup on the top side of the 199th ply of prepreg;

[0096] 422. 7 cycles of layup on the top side of the 368th ply of prepreg, completing layup of prepreg;

[0097] In step 408, the process of laying each cycle is as follows: 2 strips are laid from the back side of the blocking strip to the back side in turn, the starting position of the 2 strips in the left-right direction is A-A section, and the end position is E-E section, 1 strip is laid behind the 2nd strip, the starting position of the 3rd strip in the left-right direction is A-A section, and the end position is D-D section, 2 strips are laid behind the 3rd strip, the starting position of the 2 strips in the left-right direction is A-A section, and the end position is C-C section, 3 strips are laid from the back side of the 5th strip to the front side in turn, the starting position of the 3 strips in the left-right direction is A-A section, and the end position extends towards the direction of B-B section; in step 409, the process of laying each cycle is as follows: 3 strips are laid from the back side of the blocking strip to the back side in turn, the starting position of the 3 strips in the left-right direction is A-A section, and the end position extends towards the direction of E-E section, 2 strips are laid behind the 3rd strip, the starting position of the 2 strips in the left-right direction is A-A section, and the end position is C-C section, 3 strips are laid behind the 5th strip, the starting position of the 3 strips in the left-right direction is A-A section, and the end position is B-B section; in step 410, the process of laying each cycle is as follows: 8 strips are laid from the back side of the blocking strip to the back side in turn, the starting position of the 8 strips in the left-right direction is A-A section, and the end position extends towards the direction of B-B section; in step 411, the process of laying a layer of prepreg is as follows: 1 strip is laid from the back side of the blocking strip to the back side, the starting position of the strip in the left-right direction is A-A section, and the end position is E-E section, 1 strip is laid from the back side of the 1st strip to the front side, the starting position of the 2nd strip in the left-right direction is A-A section, and the end position is D-D section, 2 strips are laid from the back side of the 2nd strip to the front side in turn, the starting position of the 2 strips in the left-right direction is A-A section, and the end position is C-C section, 3 strips are laid from the back side of the 4th strip to the front side in turn, the starting position of the 3 strips in the left-right direction is A-A section, and the end position is B-B section; in step 412, the process of laying each cycle is as follows: 2 strips are laid from the back side of the blocking strip to the back side in turn, the starting position of the 2 strips in the left-right direction is A-A section, and the end position extends towards the direction of D-D section, 2 strips are laid from the back side of the 2nd strip to the front side in turn, the starting position of the 3rd and 4th strips in the left-right direction is A-A section, and the end position is C-C section, 3 strips are laid from the back side of the 4th strip to the front side in turn, the starting position of the 3 strips in the left-right direction is A-A section, and the end position is B-B section; in step 413, the process of laying each cycle is as follows: 4 strips are laid from the back side of the blocking strip to the back side in turn, the starting position of the 4 strips in the left-right direction is A-A section, and the end position extends towards the direction of C-C section, 3 strips are laid from the back side of the 4th strip to the front side in turn, the starting position of the 3 strips in the left-right direction is A-A section, and the end position is C-C section.In step 414, the process of laying each layer is to lay 7 strips of material from the back side of the barrier to the back, and the starting position of the 7 strips of material in the left-right direction is the A-A section, and the terminal position extends in the direction of the B-B section; in step 415, the process of laying is to lay 1 strip of material from the back side of the barrier to the back, and the starting position of the 1 strip of material in the left-right direction is the A-A section, and the terminal position is the D-D section, and then lay 2 strips of material from the back side of the first strip to the front, and the starting position of the 2 strips of material in the left-right direction is the A-A section, and the terminal position is the C-C section, and then lay 3 strips of material from the back side of the third strip to the front, and the starting position of the 3 strips of material in the left-right direction is the A-A section, and the terminal position is the B-B section; in step 416, the process of laying each layer is to lay 3 strips of material from the back side of the barrier to the back, and the starting position of the 3 strips of material in the left-right direction is the A-A section, and the terminal position extends in the direction of the C-C section, and then lay 3 strips of material from the back side of the third strip to the front, and the starting position of the fourth to sixth strips of material in the left-right direction is the A-A section, and the terminal position extends in the direction of the B-B section; in step 417, the process of laying each layer is to lay 6 strips of material from the back side of the barrier to the back, and the starting position of the 6 strips of material in the left-right direction is the A-A section, and the terminal position extends in the direction of the B-B section; in step 418, the process of laying each layer is to lay 6 strips of material from the back side of the barrier to the back, and the starting position of the 6 strips of material in the left-right direction is the A-A section, and the terminal position extends in the direction of the B-B section; in step 419, the process of laying is to lay 2 strips of material from the back side of the barrier to the back, and the starting position of the 2 strips of material in the left-right direction is the A-A section, and the terminal position is the C-C section, and then lay 3 strips of material from the back side of the second strip to the front, and the starting position of the 3 strips of material in the left-right direction is the A-A section, and the terminal position is the B-B section; in step 420, lay 5 strips of material from the back side of the barrier to the back, and the starting position of the 5 strips of material in the left-right direction is the A-A section, and the terminal position extends in the direction of the B-B section; in step 421, lay 5 strips of material from the back side of the barrier to the back, and the starting position of the 5 strips of material in the left-right direction is the A-A section, and the terminal position extends in the direction of the B-B section; in step 422, lay 5 strips of material from the back side of the barrier to the back, and the starting position of the 5 strips of material in the left-right direction is the A-A section, and the terminal position is the B-B section.

[0098] In step 408, when the last 3 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 a first set distance; in step 409, when the previous 3 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 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 the previous 2 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 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 a sixth set distance; in step 416, when the previous 3 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 a 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 an 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 a 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 a 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.

[0099] In the above laying steps, the first strip of each layer is laid on the back side of the blocking strip of the forming male mold; the thickness of the prepreg is increased by 9-10 mm for each hot press tank pre-compaction; and 1 vacuum compaction treatment is performed for every 6 layers.

[0100] In the present application, the left-right direction is parallel to the x direction in Figure 3 , and the x direction is the right direction; and the front-back direction is parallel to the y direction in Figure 3 , and the y direction is the back direction.

[0101] In the present application, the rear edge strip of the full composite part is made of full composite material, ensuring high specific strength and lightweight. The variable thickness design with the large end thickness much greater than the small end thickness can better adapt to stress distribution and enhance the overall strength of the structure. The front side of the blocking strip of the forming male mold is relatively curved, making the prepreg laying more consistent with the curvature requirements of the part and ensuring the laying quality. The laying design is combined with the autoclave process: the uniformity and density of the composite material in the curing process are ensured by using precise laying design and autoclave compaction process, avoiding problems such as poor bonding, debonding, etc. Through the above method, the structural integrity and reliability of the rear edge strip are ensured, and potential problems caused by segmented curing are reduced. The continuity of carbon fibers is maximized, unnecessary material waste is reduced, raw material utilization is improved, and manufacturing costs are reduced.

[0102] Example 2

[0103] As Figure 1 ,Figure 2 and Figure 4 which is the second embodiment of the present application, and provides a hot-autoclave forming method of a large-curvature variable-thickness trailing edge strip, which further realizes forming of a trailing edge strip of a specific size.

[0104] The trailing edge strip to be prepared in the present application has a length of about 5040 mm, the thinnest thickness at the small end is about 5.03 mm, and the thickest end is 46.02 mm.

[0105] In step 408, when the last 3 strips are laid, the length of the prepreg of the next layer is 80 mm shorter than that of the previous layer; in step 409, when the previous 3 strips are laid, the length of the prepreg of the next layer is 50 mm shorter than that of the previous layer; in step 410, the length of the prepreg of the next layer is 300 mm shorter than that of the previous layer; in step 412, when the previous 2 strips are laid, the length of the prepreg of the next layer is 100 mm shorter than that of the previous layer; in step 413, the length of the prepreg of the next layer is 50 mm shorter than that of the previous layer; in step 414, the length of the prepreg of the next layer is 420 mm shorter than that of the previous layer; in step 416, when the previous 3 strips are laid, the length of the prepreg of the next layer is 40 mm shorter than that of the previous layer; in step 417, the length of the prepreg of the next layer is 70 mm shorter than that of the previous layer; in step 418, the length of the prepreg of the next layer is 300 mm shorter than that of the previous layer; in step 420, the length of the prepreg of the next layer is 10 mm shorter than that of the previous layer; in step 421, the length of the prepreg of the next layer is 5 mm shorter than that of the previous layer; when the last 6 strips are laid, the 5 mm wide flat and continuous prepreg strip with small gap is filled by means of the lateral pressing plate.

[0106] The distance between the A-A section and the B-B section is 2000 mm, the distance between the A-A section and the C-C section is 2600 mm, the distance between the A-A section and the D-D section is 3400 mm, and the distance between the A-A section and the E-B section is 4550 mm.

[0107] The present embodiment can realize hot-autoclave forming of a long-size trailing edge strip with large curvature, variable thickness and large bending through specific lay-up design and compaction setting of the autoclave.

[0108] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application 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 application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A method for forming an autoclave with a trailing edge strip of large curvature and variable thickness, characterized in that: Includes the following steps, 1. Raw material preparation; 2. Preparation of the male mold; 3. Cut prepreg strips of different sizes; 4. According to the layup design, lay the prepreg on the surface of the male mold, starting from the larger end and working towards the smaller end, with the layup thickness gradually decreasing. The direction from the larger end to the smaller end is the length direction of the layup surface; the direction from the larger end to the smaller end is the left-to-right direction. Divide the male mold layup surface into 5 segments. The section at the larger end is section AA. Between section AA and the section at the smaller end, sections BB, CC, DD, and EE are also sequentially laid. The specific layup process in step 4 is as follows:

401. Perform 16 cycles of paving. Each cycle is as follows: pave 5 strips from back to front, with the starting position of the 5 strips being section AA and the ending position being the small end face. Pave the 6th strip behind the 5 strips, with the starting position of the 6th strip being section AA and the ending position being section EE. Pave the 7th strip behind the 6th strip, with the starting position of the 7th strip being section AA and the ending position being section DD. Pave the 8th strip behind the 7th strip, with the starting position of the 8th strip being section AA and the ending position being section CC. Pave the 9th strip behind the 8th strip, with the starting position of the 9th strip being section AA and the ending position being section BB.

402. On top of the 16 layers of prepreg, perform 24 cycles of cyclic laying. Each cycle involves laying three strips sequentially from back to front, with the starting position of the first three strips being section AA and the ending position being the smaller end. Then, lay the fourth strip behind the first three strips, with the starting position of the fourth strip also being section AA and the ending position being section EE. Finally, lay the fifth strip behind the fourth strip. The starting position of the 5th strip in the left-right direction is section AA, and the ending position of the 5th strip in the left-right direction is section DD. The 6th strip is laid behind the 5th strip. The starting position of the 6th strip in the left-right direction is section AA, and the ending position of the 6th strip in the left-right direction is section CC. Three strips are laid sequentially from back to front behind the 6th strip. When laying the last three strips, the starting position in the left-right direction is section AA, and the ending position in the left-right direction is section BB.

403. On the top of the 40 layers of prepreg, perform 3 cycles of laying. Each cycle is as follows: lay 4 strips from back to front, with the starting position of the 4 strips being AA section and the ending position being EE section. Lay the 5th strip behind the 4 strips, with the starting position of the 5th strip being AA section and the ending position of the 4th strip being DD section. Lay the 6th strip behind the 5th strip, with the starting position of the 6th strip being AA section and the ending position of the 6th strip being CC section. Lay 3 strips from back to front behind the 6th strip, with the starting position of the 3 strips being AA section and the ending position being BB section.

404. On the top of the 43 layers of prepreg, perform two cycles of paving. Each cycle is as follows: 5 strips are laid from back to front, with the starting position of the 5 strips being AA section and the ending position being DD section. The 6th strip is laid behind the 5 strips, with the starting position of the 6th strip being AA section and the ending position of the 4th strip being CC section. 3 strips are laid from back to front behind the 6th strip, with the starting position of the 3 strips being AA section and the ending position being BB section.

405. Lay the 46th layer of prepreg on the top side of the 45th layer of prepreg. Lay 6 strips from back to front. The starting position of the 6 strips in the left and right direction is AA section and the ending position is CC section. Lay the 7th strip behind the 6th strip. The starting position of the 7th strip in the left and right direction is AA section and the ending position is BB section.

406. Three cycles of laying are performed on the upper side of the 47th layer of prepreg. Each cycle of laying is as follows: nine strips are laid sequentially from the back of the retaining strip to the back. The starting position of the nine strips in the left and right direction is the AA section, and the ending position is the BB section.

407. Three cycles of laying are performed on the upper side of the 50th layer of prepreg. The process of laying each layer is as follows: the first strip is laid from the back of the retaining strip backwards. The starting position of the first strip in the left-right direction is the AA section and the ending position is the small end. The second strip is laid behind the first strip. The starting position of the second strip in the left-right direction is the AA section and the ending position is the EE section. The third strip is laid behind the second strip. The starting position of the third strip in the left-right direction is the AA section and the ending position is the DD section. Two strips are laid from back to front behind the third strip. The starting position of the two strips in the left-right direction is the AA section and the ending position is the CC section. Three strips are laid from back to front behind the fifth strip. The starting position of the three strips in the left-right direction is the AA section and the ending position is the BB section.

408. Perform 7 cycles of paving on the top side of the 53rd layer of prepreg; 409. Perform 19 cycles of laying on the top side of the 60th layer of prepreg; 410. Six cycles of laying are performed on the top side of the 79th layer of prepreg; 411. Lay a layer of prepreg on the upper side of the 85th layer of prepreg; 412. Perform 13 cycles of paving on the upper side of the 86th layer of prepreg; 413. Perform 12 cycles of paving on the top side of the 98th layer of prepreg; 414. Five cycles of laying are performed on the top 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 paving on the top side of the 116th layer of prepreg; 417. Perform 12 cycles of paving on the top side of the 136th layer of prepreg; 418. Five cycles of laying are performed on the top 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 top side of the 154th layer of prepreg; 421. Perform 169 cycles of laying on the top side of the 199th layer of prepreg; 422. Perform 7 cycles of laying on the top side of the 368th layer of prepreg to complete the laying of the prepreg; In the above steps, the front side of the first strip of each layer is attached to the back side of the baffle of the forming male mold; 5. Install a vacuum system on the forming male mold; 6. Transfer the formed male mold to the autoclave for pre-compaction; 7. Install side baffles on the forming male mold, apply release agent to the contact surface between the side baffles and the prepreg blank, and arrange a vacuum system on the forming male mold; 8. Transfer the formed male mold to an autoclave for final curing; 9. Demolding.

2. The autoclave forming method for a trailing edge strip with large curvature and variable thickness as described in claim 1, characterized in that: In step 6, the specific process of pre-compaction is as follows: the temperature is increased at a rate of 0.5℃ / min-2.0℃ / min. After the fastest heating thermocouple reaches 40℃, the parts are pressurized. When the pressure reaches 0.6±0.02MPa, it is kept constant. The medium temperature is set to 90℃. After the slowest heating thermocouple reaches 85℃, it is kept at that temperature for 1 hour. The pressure is released after cooling to below 50℃ at a rate not exceeding 1.5℃ / min. When the temperature of the fastest cooling thermocouple drops below 45℃, the can can be opened.

3. The autoclave forming method for a trailing edge strip with large curvature and variable thickness as described in claim 1, characterized in that: In step 8, during the installation process, the final curing process is as follows: The temperature is increased at a rate of 0.5℃ / min-2.0℃ / min. After the fastest-heating thermocouple reaches 40℃, the component is pressurized. When the pressure reaches 0.6±0.02MPa, it is kept constant. The medium temperature is set to 90℃. When the slowest-heating thermocouple reaches 85℃, it is kept at that temperature for 1 hour. The pressure is then increased to 0.8±0.02MPa and kept constant. The medium temperature is set to 135℃. When the slowest-heating thermocouple reaches 130℃, it is kept at that temperature for 2 hours. The pressure is then released after cooling to below 50℃ at a rate not exceeding 1.5℃ / min. The can can be opened when the fastest-cooling thermocouple reaches below 45℃.

4. The autoclave forming method for a trailing edge strip with large curvature and varying thickness as described in any one of claims 1 to 3, characterized in that: The specific process of setting up the vacuum system is as follows: first, place the absorbent cloth, release film and breathable felt evenly on the surface of the prepreg blank in sequence, and then use sealing tape and vacuum bag film to seal the mold as a whole. Check the airtightness of the vacuum bag film: the vacuum degree is required to be less than -0.095MPa.

5. The autoclave forming method for a trailing edge strip with large curvature and variable thickness as described in claim 1, characterized in that: In step 4, pre-compaction in an autoclave is performed every 9-10 mm increase in prepreg thickness; vacuum compaction is performed every 6 layers.

6. The autoclave forming method for a trailing edge strip with large curvature and variable thickness as described in claim 1, characterized in that: In step 408, the paving process in each cycle is as follows: Two strips are laid sequentially from the back of the retaining strip, with both strips starting at an AA section and ending at an EE section in the left-right direction. One strip is then laid behind the second strip. A third strip starts at an AA section in the left-right direction and ends at a DD section. Two more strips are laid behind the third strip, both starting at an AA section in the left-right direction and ending at a CC section. Three strips are then laid sequentially forward from the back of the fifth strip, all starting at an AA section in the left-right direction and extending towards the direction of the BB section at their ends. In step 409, the paving process in each cycle is as follows: Starting from the back of the retaining strip, two strips are laid sequentially from the back of the retaining strip. Three strips are laid, with each strip starting at an AA section in the left and right directions and extending towards the EE section at the end. Two more strips are laid behind the third strip, starting at an AA section in the left and right directions and ending at a CC section. Three more strips are laid behind the fifth strip, starting at an AA section in the left and right directions and ending at a BB section. In step 410, each cycle involves laying eight strips sequentially behind the retaining strip, starting at an AA section in the left and right directions and extending towards the BB section at the end. In step 411, laying one layer of prepreg involves laying one strip backward from the retaining strip. The strips are laid with the starting position of section AA and the ending position of section EE in the left-right direction. One strip is laid forward from behind the first strip. The second strip is laid with the starting position of section AA and the ending position of section DD in the left-right direction. Two more strips are laid forward from behind the second strip, with the starting position of section AA and the ending position of section CC in the left-right direction. Three more strips are laid forward from behind the fourth strip, with the starting position of section AA and the ending position of section BB in the left-right direction. In step 412, the cyclical laying process for each layer is as follows: starting from behind the retaining strip, two strips are laid forward, with the starting position of section AA in both left-right directions and the ending position facing section D. Extending in the direction of section D, two strips are laid sequentially from the back of the second strip forward. The third and fourth strips are laid with sections AA and CC in the left and right directions. Three strips are laid sequentially from the back of the fourth strip forward. The three strips are laid with sections AA in the left and right directions and sections BB in the left and right directions. In step 413, the process of laying each layer in a loop is as follows: four strips are laid sequentially from the back of the baffle strip. The four strips are laid with sections AA in the left and right directions and their ends extend towards the direction of section CC. Three strips are laid sequentially from the back of the fourth strip forward. The three strips are laid with sections AA in the left and right directions and their ends are CC in the left and right directions.In step 414, the cyclical laying process for each layer is as follows: starting from the back of the retaining strip, seven strips are laid sequentially. The starting position of each strip in the left-right direction is section AA, and the ending position extends towards section BB. In step 415, the laying process is as follows: starting from the back of the retaining strip, one strip is laid sequentially. The starting position of this strip in the left-right direction is section AA, and the ending position is section DD. Then, two strips are laid sequentially from the back of the first strip, with the starting position of each strip in the left-right direction being section AA and the ending position being section CC. Finally, three strips are laid sequentially from the back of the third strip. The starting position of the strip in the left-right direction is section AA, and the ending position is section BB. In step 416, the process of laying each layer in a loop is as follows: three strips are laid sequentially from the back of the retaining strip, with the starting position of the three strips in the left-right direction being section AA and the ending position extending towards the direction of section CC. Three strips are then laid sequentially from the back of the third strip forward. The starting position of the fourth to sixth strips in the left-right direction is section AA, and the ending position extends towards the direction of section BB. In step 417, the process of laying each layer in a loop is as follows: six strips are laid sequentially from the back of the retaining strip. The starting position for paving in the left-right direction is section AA, and the ending position extends towards section BB. In step 418, the paving process for each layer is as follows: 6 strips are laid sequentially from the back of the retaining strip, with the starting position of the 6 strips in the left-right direction being section AA and the ending position extending towards section BB. In step 419, the paving process is as follows: 2 strips are laid sequentially from the back of the retaining strip, with the starting position of the 2 strips in the left-right direction being section AA and the ending position being section CC. Then, 3 strips are laid sequentially from the back of the second strip forward, with the 3 strips in the left-right direction... The starting point for application is section AA, and the ending point is section BB. In step 420, five strips are applied sequentially from the back of the retaining strip, with the starting point of each strip in the left-right direction being section AA and the ending point extending towards section BB. In step 421, five strips are applied sequentially from the back of the retaining strip, with the starting point of each strip in the left-right direction being section AA and the ending point extending towards section BB. In step 422, five strips are applied sequentially from the back of the retaining strip, with the starting point of each strip in the left-right direction being section AA and the ending point being section BB.

7. The autoclave forming method for a trailing edge strip with large curvature and variable thickness as described in claim 6, characterized in that: In step 408, when laying the last 3 strips, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by a first predetermined distance; in step 409, when laying the first 3 strips, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by a second predetermined distance; in step 410, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by a third predetermined distance; in step 412, when laying the first 2 strips, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by a fourth predetermined distance; in step 413, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by a fifth predetermined distance; in step 414... In step 416, when laying the first three strips, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by a sixth predetermined distance; in step 417, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by an eighth predetermined distance; in step 418, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by a ninth predetermined distance; in step 420, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by a tenth predetermined distance; in step 421, the length of the prepreg in the next layer is shorter than the length of the prepreg in the previous layer by a predetermined distance.

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