A method for manufacturing an H-shaped girder by an automatic tape laying method and cutting it into T-shaped longerons

Abstract

The present invention discloses a method for manufacturing an H-shaped girder and cutting it into T-shaped long girder by adopting an automatic tape laying method. The method of cutting the H-shaped long girder into two T-shaped long girder adopts a scheme with high production efficiency, and two T-shaped long girder are cured in a single time, which reduces the curing cost and has high product dimensional accuracy. The offset docking method between different layers of +45° and -45° unidirectional tapes can effectively reduce the laying influence caused by different ± angles, and the tooling manufacturing scheme is relatively simple, which can improve the accuracy of the tooling surface and the molding quality, and can mold two long girder at one time, shortening the parts manufacturing cycle, reducing the tooling cost and the number of tooling, and ensuring the position accuracy of the vertical ribs.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing technology of T-shaped long stringers of vertical tail wall panels of aircraft, and in particular to a method of manufacturing H-shaped stringers by automatic tape laying and cutting the H-shaped stringers into T-shaped long stringers. Background Art

[0002] As one of the key load-bearing structural components in the vertical tail wall panel, the long stringer was previously produced using T-shaped long stringers through automatic tape laying and hot diaphragm forming processes. Due to the small cross-section and long length of the long stringer, tooling processing was difficult and the precision was difficult to control. In addition, the tooling was prone to deformation after repeated use, resulting in poor product quality and difficulty in stabilizing quality.

[0003] The existing T-shaped long stringer uses an automatic tape laying machine to lay the flat plate after the single-side "L" is unfolded, and pre-formed through a hot diaphragm. The pre-formed "L"-shaped blank is combined into a T shape through a tooling, and finally filled with twist strips and bottom edge flat plate blanks, and encapsulated and solidified into a T-shaped long stringer. Due to the small cross-sectional size of the T-shaped long stringer, high manufacturing precision of the tooling is required. At the same time, due to the small cross-sectional size of the tooling, the tooling is prone to deformation after repeated use, and has a short service life, which reduces the product molding quality.

[0004] In addition, when the existing H-beam is used to split the T-beam, when the upper and lower C-shaped blanks are automatically laid on the tape-laying flatbed tooling, due to the symmetrical common mold of the left and right long stringers, the existing long stringer layup plan is symmetrical at ±45°. For this plan, in order to achieve the designed layup angle, the following problems will arise: the C-shaped blank flat plates and edge strip flat plates on both sides of the H-shape are laid by the automatic tape-laying machine. Considering that the C-shaped blank flat plates of the two symmetrical long stringers will have opposite layup angles during the layup, during the tape-laying process, discontinuous layup is performed in opposite directions (+45 / -45) of the two long stringers, and continuous layup is performed at the remaining 0° and 90° angles. However, in the subsequent hot diaphragm preforming process, only the 90° layup can serve as support for connecting the blanks on both sides. According to the layup information, there is only one 90° layer at the tip of the long stringer, and the +45° and -45° unidirectional tapes need to be cut at an angle at the center of the web. This layup plan has the risk of fracture of the left and right blanks. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art by providing a method for manufacturing an H-shaped girder and slitting it into T-shaped long girders using an automated tape laying method. The method of slitting an H-shaped long girder into two T-shaped long girders achieves high production efficiency, produces two T-shaped long girders in a single curing operation, reduces curing costs, and achieves high product dimensional accuracy. The use of offset butt-jointing between different layers of +45° and -45° unidirectional tape effectively reduces the impact of different ± angles on the laying process. The tooling manufacturing method is relatively simple, improves the accuracy of the tooling profile, enhances molding quality, and enables the simultaneous molding of two long girders. This shortens the part manufacturing cycle, reduces tooling costs and the number of tooling units, and ensures the positional accuracy of the vertical ribs.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A method for manufacturing an H-shaped girder by an automatic tape laying method and cutting the H-shaped girder into T-shaped long girder comprises the following steps:

[0008] Step (A): Automatic tape laying: On the tape laying flatbed tooling, the upper and lower C-shaped blanks and the flat-plate laying blanks on both sides of the long stringer are laid by the automatic tape laying machine, and the blank positioning feature is used to unload the blanks by ultrasonic unloading;

[0009] Step (B): Blank transfer and positioning: The preformed prepreg flat sheet is transferred to the heat diaphragm tooling via a dedicated transfer vehicle. The theoretical shape of the positioning pieces is pre-cut at both ends of the prepreg flat sheet. Removable material layer thickness limiting bosses are designed at both ends of the core mold to ensure that the sheet meets the requirements in terms of length and width.

[0010] Step (C): bending the film into upper and lower C-shaped blank structures by a hot diaphragm preforming machine;

[0011] Step (D): Flipping the upper C-shaped blank and combining it with the lower C-shaped blank: By flipping the tooling, the upper C-shaped blank tooling with the prepreg is combined with the lower C-shaped blank tooling through the two end guide pin positioning devices. After the combination, a temporary vacuum bag is used to evacuate the remaining air and compact the layer.

[0012] Step (E): Remove the upper C-shaped blank tooling, install the composite upper mold through the positioning pins and positioning holes, and after assembly, use a temporary vacuum bag to evacuate to remove residual air and compact the layer;

[0013] Step (F): Twist strip forming: Calculate the required width of the twist strip according to its cross-sectional area, and form the twist strip using dedicated twist strip forming equipment; Fill the triangular area between the upper and lower C-shaped blanks with twist strips, and after assembling, use a temporary vacuum bag to evacuate to remove residual air and compact the layer; Edge strip blank assembly: Assemble the edge strip flat blank with the upper and lower C-shaped blanks, and after assembling, use a temporary vacuum bag to evacuate to remove residual air and compact the layer;

[0014] Step (G): Packaging and curing: Use the positioning blocks on both sides of the tooling edge strip to position the composite cover plate to the edge strips on both sides, make a vacuum bag and vacuum compact it, check for airtightness, and cure it after it passes the airtight test;

[0015] Step (H): Demolding and cleaning: removing the tooling of the upper and lower C-shaped blanks and cleaning the upper and lower C-shaped blanks;

[0016] Step (I): CNC milling: Before demoulding, a drilling template is installed to make process holes for milling positioning, and then the H-shaped long stringer is demoulded; the H-shaped long stringer is then fixed in the milling tool through the positioning ear holes, and the H-shaped long stringer is first roughly cut into two T-shaped long strings. The T-shaped long stringer is then clamped using a special tooling and CNC milled to chamfer the bottom edge. After the bottom edge milling is completed, the contour of the bottom edge and one side of the vertical rib is measured using a laser tracker;

[0017] Step (J): Inspection: In accordance with the acceptance technical requirements, after milling is completed, the rough-cut T-type long stringer profile is measured using a digital measuring device without applying any force; the profile accuracy of the two T-type long stringers is within the tolerance range and meets the acceptance criteria.

[0018] Furthermore, the method further comprises the following steps:

[0019] Step (K): Manual milling: After the bottom edge profile measurement is completed, the rough-cut T-shaped long stringer fixed in the milling tool is removed, and the tool is mapped to the outline of the vertical rib position line of the T-shaped long stringer for manual milling. Finally, the H-shaped long stringer is divided into two, and two target T-shaped long strings are manufactured;

[0020] Step (L): Thickness tolerance test: Use a steel ball thickness gauge to measure the thickness of the T-type long stringer, with at least 5 measurement points in the same thickness area. The qualified test meets the acceptance standard; Non-destructive testing: The entire structure is tested using the reflection method A-scan, and the non-destructive test results are qualified.

[0021] Further, in step (A):

[0022] The symmetrical allowance of the ply centerline or web centerline relative to the stringer stock allowance boundary is designed to be increased; during the automatic tape laying process, when laying the Nth layer, the +45° unidirectional tape on the left is offset along the ply centerline toward the right stringer stock allowance boundary during the tape laying process, that is, the right end of the +45° unidirectional tape is offset to the right stringer stock allowance boundary, and the -45° unidirectional tape on the right is disconnected along the right stringer stock allowance boundary during the tape laying process, that is, the left end of the -45° unidirectional tape starts at the right stringer stock allowance boundary; when laying the N+1th layer, the +45° and -45° unidirectional tapes are laid in the opposite manner, that is, the right end of the +45° unidirectional tape is offset to the left stringer stock allowance boundary, and the left end of the -45° unidirectional tape starts at the left stringer stock allowance boundary.

[0023] This can effectively avoid the problem of +45° and -45° billet bevel angles, strengthen the support of the left and right side connections and prevent the billet from slipping during hot diaphragm, while controlling the uniform thickness of the ply centerline / web center during solidification.

[0024] Furthermore, it is characterized in that, before step (A), the method further comprises:

[0025] Step (10): Tape laying program design: Use the Catia software composite material module to design the blank flat sheet layer, use the automatic tape laying programming software Torlay to plan the tape laying path for the layer design digital model, and generate the tape laying CNC program; specifically, use the Torlay tape laying programming software to generate the prepreg tape, according to the specification requirements, the gap between the joints is not less than 2.5mm, the joints of each layer are staggered by at least 25mm, and a gap of 0.5mm is left at the +45° and -45° boundaries of the same layer to prevent overlap during the tape laying process; the generated tape is corrected and edited to reduce waste generation and reduce the automatic tape laying time, and finally a CNC numerical control program is generated;

[0026] Step (20): Tool preparation: clean the upper C-shaped blank thermal diaphragm tooling and the lower mold forming mold, the composite upper mold cover plate, the edge strip silicone soft cover plate and the multiple pins used for the composite upper mold cover plate, and use solvent acetone or methyl ethyl ketone to clean the surface; apply release agent to the inner smooth surface of the edge strip silicone cover plate, the forming surface of the composite upper mold cover plate, and the multiple pins used for the composite upper mold cover plate of the lower mold forming mold; when applying the last layer of release agent, the direction perpendicular to the previous layer should be adopted to ensure that the release agent can completely cover the required area of the tooling, and at least 15 minutes of drying is required between the two layers of release agent; lay a layer of non-porous film on the surface of the tape laying flat tooling, turn on vacuum adsorption, and adsorb and level the non-porous film;

[0027] Step (30): Material preparation: Take out the prepreg from the cold storage, place it in a clean room and keep it sealed; it can be used only when the outer packaging film is wiped dry and no condensation water is generated. Use X850 toughened resin carbon fiber unidirectional tape and thaw it normally for 6-8 hours.

[0028] The present invention discloses a method for manufacturing an H-shaped girder and slitting it into T-shaped long girders using an automated tape laying method. The method employs a method for slitting an H-shaped long girder into two T-shaped long girders, resulting in high production efficiency, a single curing process for two T-shaped long girders, and reduced curing costs while maintaining high product dimensional accuracy. The use of offset butt-jointing methods between different layers of +45° and -45° unidirectional tape effectively reduces the impact of paving caused by varying ± angles. The tooling manufacturing method is relatively simple, improving the accuracy of the tooling profile and molding quality. Two long girders can be molded in one go, shortening the part manufacturing cycle, reducing tooling costs and the number of tooling pieces, and ensuring the accuracy of the vertical rib position. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of the offset paving scheme between different layers of ±45° unidirectional tape according to the present invention;

[0030] Figure 2 It is a structural flow chart of the modeling diagram corresponding to each process of the present invention;

[0031] Figure 3 It is a process flow chart of the present invention;

[0032] Figure 4 It is a structural schematic diagram of the H-shaped long stringer cutting line and vertical reinforcement position line of the present invention. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] The present invention will be described in further detail below with reference to the accompanying drawings.

[0035] like Figure 1-4 As shown, a method for manufacturing an H-shaped girder by an automatic tape laying method and cutting it into T-shaped long girder comprises the following steps:

[0036] Step (A): Automatic tape laying: On the tape laying flat tooling, the upper and lower C-shaped blanks and the flat layer blanks on both sides of the long stringer are laid by the automatic tape laying machine, and the blank positioning features (such as the attached Figure 2(as shown in process A);

[0037] Step (B): Blank transfer and positioning: The preformed prepreg flat sheet is transferred to the hot diaphragm tooling through a special transfer vehicle. The hot diaphragm tooling can be shared with the forming mold tooling. The theoretical shape of the positioning piece (such as size 60*60mm) is cut in advance at both ends of the prepreg flat sheet. The detachable material layer thickness limiting boss is designed at both ends of the core mold to ensure that the position of the sheet in the length and width direction meets the requirements (such as the attached Figure 2 (as shown in process B);

[0038] Step (C): Bend the upper and lower C-shaped blanks into a preformed structure (see attached) by a hot diaphragm preformer. Figure 2 (as shown in process C);

[0039] Step (D): Flip the upper C-shaped blank and combine it with the lower C-shaped blank: Flip the fixture and combine the upper C-shaped blank with the prepreg through the two end guide pin positioning devices with the lower C-shaped blank. After the combination, use a temporary vacuum bag to remove the remaining air and compact the layer (as shown in the attached Figure 2 (as shown in step D);

[0040] Step (E): Remove the upper C-shaped blank fixture, install the composite upper mold through the positioning pins and positioning holes, and use a temporary vacuum bag to remove the remaining air and compact the layer (if attached). Figure 2 (as shown in process E);

[0041] Step (F): Twist strip (0° fiber twist) forming: The required width of the twist strip is calculated according to the twist strip cross-sectional area, and the twist strip is formed using a dedicated twist strip forming device; the twist strip is filled in the triangular area between the upper and lower C-shaped blanks, and after assembly, a temporary vacuum bag is used to evacuate the remaining air and compact the layer;

[0042] Edge strip blank combination: Combine the edge strip flat blank with the upper and lower C-shaped blanks. After combination, use a temporary vacuum bag to remove the remaining air and compact the layer (if attached). Figure 2 (as shown in process F);

[0043] Step (G): Packaging and curing: Use the positioning blocks on both sides of the tooling edge strip to position the composite cover plate to the edge strips on both sides, and make a vacuum bag to vacuum compact it, check the airtightness, and cure it after the airtightness is qualified (as shown in the attached Figure 2 (as shown in process G);

[0044] Step (H): Demolding and cleaning: Remove the tooling of the upper and lower C-shaped blanks and clean them (as shown in the attached Figure 2 (as shown in process H);

[0045] Step (I): CNC milling: Before demoulding, install the drilling template to make the process holes for milling positioning, and then demould the H-shaped long stringer; then fix the H-shaped long stringer in the milling tooling through the positioning ear holes, first roughly cut the H-shaped long stringer into two T-shaped long stringers, and then use a special tooling to clamp the T-shaped long stringer shape, and perform CNC milling and chamfering of the bottom edge. After the bottom edge milling is completed, the contour of the bottom edge and the side of the vertical rib is measured by a laser tracker (as shown in the attached figure). Figure 2 (as shown in step I);

[0046] Step (J): Inspection: In accordance with the acceptance technical requirements, after milling is completed, the rough-cut T-stringer profile is measured using a digital measuring device (laser tracking detector) without applying any force. The profile accuracy of the two T-stringers is within the tolerance range and meets the acceptance criteria.

[0047] Step (K): Manual milling: After the bottom edge profile measurement is completed, the rough-cut T-shaped stringer fixed in the milling tool is removed, and the tool is mapped to the outline of the vertical rib position line of the T-shaped stringer for manual milling. Finally, the H-shaped stringer is divided into two, and two fine-cut T-shaped stringers (target T-shaped stringers) are manufactured;

[0048] Step (L): Thickness tolerance test: Use a steel ball thickness gauge to measure the thickness of the T-type long stringer, with at least 5 measurement points in the same thickness area. The qualified test meets the acceptance standard; Non-destructive testing: The entire structure is tested using the reflection method A-scan, and the non-destructive test results are qualified.

[0049] Among them, in step (A): the symmetrical margin of the ply centerline or the web centerline relative to the long stringer blank margin is designed to be increased, specifically, the single-side distance from the ply centerline to the long stringer blank margin is 100mm-120mm; during the automatic tape laying process, when laying the Nth layer, the +45° unidirectional tape on the left is offset along the ply centerline toward the right long stringer blank margin during the tape laying process, that is, the right end of the +45° unidirectional tape is offset to the right long stringer blank margin. The -45° unidirectional tape on the right is cut off along the excess boundary of the right stringer billet during the tape laying process, that is, the left end of the -45° unidirectional tape starts at the excess boundary of the right stringer billet; when laying the N+1th layer, the +45° and -45° unidirectional tapes are laid in the opposite manner, that is, the right end of the +45° unidirectional tape is offset to the excess boundary of the left stringer billet, and the left end of the -45° unidirectional tape starts at the excess boundary of the left stringer billet.

[0050] This can effectively avoid the problem of +45° and -45° billet bevel angles, strengthen the support of the left and right side connections and prevent the billet from slipping during hot diaphragm, while controlling the uniform thickness of the ply centerline / web center during solidification.

[0051] Wherein, before step (A), the method further comprises:

[0052] Step (10): Tape laying program design: Use the Catia software composite material module to design the blank flat sheet layer, use the automatic tape laying programming software Torlay to plan the tape laying path for the layer design digital model, and generate the tape laying CNC program; specifically, use the Torlay tape laying programming software to generate the prepreg tape, according to the specification requirements, the gap between the joints is not less than 2.5mm, the joints of each layer are staggered by at least 25mm, and a gap of 0.5mm is left at the +45° and -45° boundaries of the same layer to prevent overlap during the tape laying process; the generated tape is corrected and edited to reduce waste generation and reduce the automatic tape laying time, and finally a CNC numerical control program is generated;

[0053] Step (20): Tool preparation: clean the upper C-shaped blank heat diaphragm tooling and the lower mold forming mold, the composite upper mold cover, the edge strip silicone soft cover and the multiple pins used for the composite upper mold cover; use solvent acetone or methyl ethyl ketone to clean the surface; pour the solvent on a clean rag, do not soak the rag in the solvent, do not use the rag to block the container mouth to soak the rag, and do not pour the solvent directly onto the tooling surface; wipe the tooling surface with a solvent-soaked rag, and wipe it dry with a clean, dry rag before the solvent evaporates, and do not let the solvent evaporate and dry; Clean the flat tooling used for automatic tape laying; apply release agent to the smooth inner surface of the edge strip silicone cover, the forming surface of the composite upper mold cover, and the multiple pins used in the composite upper mold cover of the lower mold forming mold. When applying the release agent, there should be no moisture on the tooling surface. Do not pour the release agent directly on the tooling. If the release agent is applied excessively, wipe it off the tooling; when applying the second layer of release agent, it should be applied in a direction perpendicular to the previous layer to ensure that the release agent can completely cover the required area of the tooling. The two layers of release agent should be allowed to dry for at least 15 minutes.

[0054] Place a layer of non-porous membrane on the surface of the tape laying flat tooling, turn on vacuum adsorption, and adsorb and level the non-porous membrane;

[0055] Step (30): Material preparation: Take out the prepreg from the cold storage, place it in a clean room and keep it sealed; it can only be used when the outer packaging film is wiped dry and no condensation water is generated. Use X850 toughened resin carbon fiber unidirectional tape and thaw it normally for 6-8 hours; if condensation water is found on the material roll or in the bag, the material should be rejected. If the prepreg shows any signs of moisture after removing the packaging bag or during use, it should be rejected.

[0056] The present invention discloses a method for manufacturing an H-shaped girder and slitting it into T-shaped long girders using an automated tape laying method. The method employs a method for slitting an H-shaped long girder into two T-shaped long girders, resulting in high production efficiency, a single curing process for two T-shaped long girders, and reduced curing costs while maintaining high product dimensional accuracy. The use of offset butt-jointing methods between different layers of +45° and -45° unidirectional tape effectively reduces the impact of paving caused by varying ± angles. The tooling manufacturing method is relatively simple, improving the accuracy of the tooling profile and molding quality. Two long girders can be molded in one go, shortening the part manufacturing cycle, reducing tooling costs and the number of tooling pieces, and ensuring the accuracy of the vertical rib position.

[0057] The above-mentioned embodiments are illustrative of the present invention, not limiting thereof. It is understood that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing an H-shaped girder by automated tape laying and cutting the H-shaped girder into T-shaped long girder comprises the following steps: Step (A): Automatic tape laying: On the tape laying flatbed tooling, the upper and lower C-shaped blanks and the flat-bed blanks on both sides of the long stringer are laid by the automatic tape laying machine, and the blank positioning feature is used to unload the blanks by ultrasonic unloading; Step (B): Blank transfer and positioning: The preformed prepreg flat sheet is transferred to the heat insulation tooling via a dedicated transfer vehicle. The theoretical shape of the positioning pieces is pre-cut at both ends of the prepreg flat sheet. Removable material layer thickness limiting bosses are designed at both ends of the core mold to ensure that the sheet meets the requirements in terms of length and width. Step (C): bending into upper and lower C-shaped blank structures by a hot diaphragm preforming machine; Step (D): Flipping the upper C-shaped blank and combining it with the lower C-shaped blank: By flipping the tooling, the upper C-shaped blank tooling with the prepreg is combined with the lower C-shaped blank tooling through the two end guide pin positioning devices. After the combination, a temporary vacuum bag is used to evacuate the remaining air and compact the layer. Step (E): Remove the upper C-shaped blank tooling, install the composite upper mold through the positioning pins and positioning holes, and use a temporary vacuum bag to evacuate the remaining air and compact the layer after assembly; Step (F): Twist strip forming: The required width of the twist strip is calculated according to the cross-sectional area of the twist strip, and the twist strip is formed using a dedicated twist strip forming device; the twist strip is filled in the triangular area between the upper and lower C-shaped blanks, and after assembling, a temporary vacuum bag is used to evacuate the remaining air and compact the layer; flange blank assembly: The flange flat blank is assembled with the upper and lower C-shaped blanks, and after assembling, a temporary vacuum bag is used to evacuate the remaining air and compact the layer; Step (G): Packaging and curing: Use the positioning blocks on both sides of the tooling edge strip to position the composite cover plate to the edge strips on both sides, make a vacuum bag and vacuum compact it, check for airtightness, and cure after the airtightness is qualified; Step (H): Demolding and cleaning: removing the tooling of the upper and lower C-shaped blanks and cleaning the upper and lower C-shaped blanks; Step (I): CNC milling: Before demoulding, a drilling template is installed to make process holes for milling positioning, and then the H-shaped long stringer is demoulded; the H-shaped long stringer is then fixed in the milling tool through the positioning ear holes, and the H-shaped long stringer is first roughly cut into two T-shaped long strings. The T-shaped long stringer is then clamped with a special tool and the bottom edge chamfer is CNC milled. After the bottom edge milling is completed, the contour of the bottom edge and the side of the vertical rib is measured using a laser tracker; Step (J): Inspection: In accordance with the acceptance technical requirements, after milling is completed, the rough-cut T-stringer profile is measured using a digital measuring device without applying any force. The profile accuracy of the two T-stringers is within the tolerance range and meets the acceptance criteria. Step (K): Manual milling: After the bottom edge profile measurement is completed, the rough-cut T-shaped long stringer fixed in the milling fixture is removed, and the tooling is mapped to the outline of the vertical rib position line of the T-shaped long stringer for manual milling. Finally, the H-shaped long stringer is divided into two, and two target T-shaped long strings are manufactured; Step (L): Thickness tolerance test: Use a steel ball thickness gauge to measure the thickness of the T-type long stringer. There are at least 5 measurement points in the same thickness area. The qualified test meets the acceptance standard. Non-destructive testing: The whole is tested by reflection method A scan. The non-destructive test results are qualified. Wherein, in step (A): The symmetrical allowance of the ply centerline or web centerline relative to the stringer stock allowance boundary is designed to be increased; during the automatic tape laying process, when laying the Nth layer, the +45° unidirectional tape on the left is offset along the ply centerline toward the right stringer stock allowance boundary during the tape laying process, that is, the right end of the +45° unidirectional tape is offset to the right stringer stock allowance boundary, and the -45° unidirectional tape on the right is disconnected along the right stringer stock allowance boundary during the tape laying process, that is, the left end of the -45° unidirectional tape starts at the right stringer stock allowance boundary; when laying the N+1th layer, the +45° and -45° unidirectional tapes are laid in the opposite manner, that is, the right end of the +45° unidirectional tape is offset to the left stringer stock allowance boundary, and the left end of the -45° unidirectional tape starts at the left stringer stock allowance boundary.

2. The method of manufacturing an H-shaped girder and cutting it into T-shaped long girder by using an automatic tape laying method according to claim 1, characterized in that: in, Before step (A), the following steps are also included: Step (10): Tape laying program design: Use the Catia software composite material module to design the blank flat sheet layer, use the automatic tape laying programming software Torlay to plan the tape laying path for the layer design digital model, and generate the tape laying CNC program; specifically, use the Torlay tape laying programming software to generate the prepreg tape, according to the specification requirements, the gap between the joints is not less than 2.5mm, the joints of each layer are staggered by at least 25mm, and a gap of 0.5mm is left at the +45° and -45° boundaries of the same layer to prevent overlap during the tape laying process; the generated tape is corrected and edited to reduce waste generation and reduce the automatic tape laying time, and finally a CNC program is generated; Step (20): Tool preparation: clean the upper C-shaped blank thermal diaphragm tooling and the lower mold forming mold, the composite upper mold cover, the edge strip silicone soft cover and the multiple pins used for the composite upper mold cover, and use solvent acetone or methyl ethyl ketone to clean the surface; apply release agent to the inner smooth surface of the edge strip silicone cover, the forming surface of the composite upper mold cover, and the multiple pins used for the composite upper mold cover of the lower mold forming mold; when applying the last layer of release agent, it should be applied in a direction perpendicular to the previous layer to ensure that the release agent can completely cover the required area of the tooling, and it takes at least 15 minutes to dry between the two layers of release agent; lay a layer of non-porous film on the surface of the flat plate tooling, turn on vacuum adsorption, and adsorb and level the non-porous film; Step (30): Material preparation: Take out the prepreg from the cold storage, place it in a clean room and keep it sealed; it can be used only when the outer packaging film is wiped dry and no condensation water is generated. Use X850 toughened resin carbon fiber unidirectional tape and thaw it normally for 6-8 hours.

Images