CN117962352B - Integral forming method of lip composite material with large size and complex section - Google Patents
Integral forming method of lip composite material with large size and complex section Download PDFInfo
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- CN117962352B CN117962352B CN202410364896.5A CN202410364896A CN117962352B CN 117962352 B CN117962352 B CN 117962352B CN 202410364896 A CN202410364896 A CN 202410364896A CN 117962352 B CN117962352 B CN 117962352B
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- 239000002131 composite material Substances 0.000 title claims abstract description 33
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- 239000000463 material Substances 0.000 claims abstract description 18
- 239000000047 product Substances 0.000 claims description 83
- 238000002360 preparation method Methods 0.000 claims description 15
- 238000009826 distribution Methods 0.000 claims description 13
- 238000007493 shaping process Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 8
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- 238000009966 trimming Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
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- 238000005498 polishing Methods 0.000 claims description 4
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- 238000000748 compression moulding Methods 0.000 claims description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
- B29C33/305—Mounting of moulds or mould support plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/545—Perforating, cutting or machining during or after moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
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Abstract
The invention belongs to the technical field of aircraft manufacturing, and particularly relates to a method for integrally forming a lip composite material with a large-size and complex section, which comprises the following steps: s1, structural design of lip parts: designing a lip part structure according to stealth performance requirements; s2, structural design of a forming die: determining a model structure of a forming die according to the specific structure of the lip part, and dividing a splicing module of the model structure of the forming die according to the type of the lip part; s3, pre-treating a mould and preparing materials, then performing distributed paving and preliminary forming, putting a lip part paving product into an autoclave for forming, and demoulding the lip part hot-press forming product step by step; and (5) carrying out finish machining on the demolding product to obtain a final lip part product. The technical scheme is based on the special die structure of the adaptation of part structural features, realizes the integral molding of the barrel body split die, ensures the light weight and the high surface quality of the lip barrel body, and solves the problem of complicated section demoulding.
Description
Technical Field
The invention belongs to the technical field of aircraft manufacturing, and particularly relates to a method for integrally forming a lip composite material with a large size and a complex section.
Background
The air flow, the flow speed and the air flow quality of the lip and the air inlet channel of the aircraft have important influence on the working state of the engine, so that in the development process of the aircraft, the dimensional accuracy, the quality of the inner surface, the quality of the outer surface, the strength, the rigidity and the weight of the lip are all high, the shape and the curved surface of the lip of the aircraft are often complex based on the limitation of the requirements of pneumatic performance, stealth and the like, and the structural design and the manufacturing of the lip are extremely difficult. In addition, lips are classified into a single shot type and a double shot type according to the state of the airplane (two types, single shot and double shot). The manufacturing difficulty is greater for double hair than for single hair, mainly due to the following reasons:
1) The lip is required to be divided into two cylinders, which are limited by the installation of an air inlet channel and an engine and the space of an airplane, the space between the two cylinders is very small, a gap of only 20mm-50mm is reserved, the operation space of a numerical control processing mode or a common composite material laying method is limited, and the implementation is difficult;
2) The surface of the windward prism of the inner cavity separation cylinder body is a double-R curved surface, the processing difficulty is extremely high, and the surface quality requirement is extremely high;
3) A narrow slit space is formed between the left cylinder body and the right cylinder body, and various processing modes are difficult to mold.
The current aircraft lip manufacturing is generally divided into two forms, namely segmentation and integral molding.
The sectional forming method generally adopts:
1) Stamping and forming a metal plate and then welding; the metal plate is commonly used for forming a relatively simple lip, and for a large-size lip, the front edge curved surface of the lip of the metal plate stamping part is complex and difficult to form, and even if the metal plate stamping part can be formed, a large number of welding areas are difficult to ensure the surface quality, the connection strength and the weight index of the lip. For the double-hair lip, the front edge structure is too complex, the curvature change is larger, the sheet metal stamping is not easy to form, even if the sheet metal stamping can be formed, the surface quality and the strength performance after the forming are difficult to ensure, and the weight is larger.
2) And (3) sectional machining and assembling: and the lap joint, the splice joint and the sleeve joint are connected by adopting a fastener. The method is suitable for the lips with relatively regular outline dimensions, adopts the combination assembly of the machined part frame and the sheet metal skin, but for parts with larger dimensions and complex shape surfaces, the number of manufactured parts in sections is huge, the assembly difficulty is high, the material utilization rate is extremely low, the cost is high, and the parts with complex parts cannot be processed. The problems that machining difficulty is high, material utilization rate is extremely low, assembly difficulty is high, a part area cannot be machined, and thickness and weight of a part are difficult to control exist in the sectional machining and assembling.
The integral molding generally adopts:
1) The electric spark cutting is easy to deform and concentrate stress of the processed parts, is suitable for complex lips with smaller sizes, and is difficult to process for lips with large-size and complex cross sections.
2) Supplementing machining after casting molding: the cast part has large weight, poor surface quality and lower strength and manufacturing precision; the supplementary machining is limited by the shape of the part, and the complex surface area cannot be subjected to supplementary machining.
3) 3D printing, wherein the size of 3D powder feeding printing is relatively large, but is still limited by the size of domestic equipment, and can only meet the requirement of processing parts with the size of less than 800mm, thereby being applicable to manufacturing small-size lips; the method is also limited by the fact that complex surfaces cannot be machined in a complementary mode, and the quality and strength of the 3D printing welding line are not high, so that the surface quality of the part is poor.
4) And (3) integrally forming a composite material: the parts have strong designability, but at present, only the manufacturing of part of lip parts with relatively simple forming surfaces can be realized, and no effective and reliable forming method exists for large-size/oversized complicated-section lips.
Disclosure of Invention
The invention aims to solve the difficult problem of manufacturing and forming the large-size complex aircraft lip, and provides a method for integrally forming a large-size complex-section lip composite material, which realizes the integral forming of the lip and is suitable for forming lips with various complex-size curved surfaces.
The technical scheme adopted for achieving the purposes is as follows:
the integral forming method of the lip mouth composite material with the large size and the complex section is characterized by comprising the following steps of:
s1, structural design of lip parts: designing a lip part structure according to stealth performance requirements; the type of the lip part comprises a V-shaped single-shot lip and a W-shaped double-shot lip;
S2, structural design of a forming die: determining a model structure of a forming die according to the specific structure of the lip part, and dividing a splicing module of the model structure of the forming die according to the type of the lip part;
s3, paving and forming parts, wherein the method comprises the following steps of:
S31, mold pretreatment and material preparation;
s32, sequentially carrying out distribution paving and preliminary forming work based on a forming die to obtain a lip part paving product;
s33, placing the paving product of the lip part into an autoclave for molding to obtain a hot-press molded product of the lip part;
S34, based on the split joint module division of the forming die, the hot-press forming product of the lip part is demoulded step by step;
And S35, carrying out finish machining on the demolding product to obtain a final lip part product.
Preferably, in the step S1, the structural arrangement of the V-shaped single-shot lip part includes the following steps:
s11-1, setting a lip barrel of the lip part to be of a hyperboloid structure under the condition that the unidirectional size of the lip part is larger than 1m, gradually decreasing the section size of the lip barrel along the axial direction and gradually increasing the section size of the lip barrel, wherein the size of the rear end of the lip barrel is smaller than the size of the front end of the lip barrel;
S11-2, arranging the upper edge of the front end of the lip barrel in a V shape, and arranging the lower edge of the front end in a zigzag shape; the two sides of the lower edge of the front end are provided with first extension sections which are in the same direction with the V shape of the upper edge of the front end;
s11-3, setting the cross section of the V-shaped upper edge at the front end of the lip barrel to be in a first U-shaped deep groove structure.
Preferably, in the step S11-2, the V-shaped included angle of the upper edge of the front end is 110 degrees; the included angle of the saw teeth is 110 degrees.
Preferably, in the step S2, the molding die for the V-shaped single-shot lip part comprises a die base, a lip barrel molding die, extending dies on two sides of the lip, a male die for paving the front edge of the lip, and a female die for molding the front edge of the lip;
the lip cylinder forming die is detachably connected with the die base and comprises a middle supporting body and left and right side supporting bodies, and the middle supporting body is spliced and matched with the side supporting bodies and used for assisting in forming the lip cylinder;
The extending molds at two sides of the lip are detachably connected with the mold base and the barrel forming mold and are used for assisting the forming of the first extending section of the V-shaped single-shot lip;
The male die is paved on the front edge of the lip and detachably connected with the cylinder forming die, and is used for assisting the forming of the inner surface of the first U-shaped deep groove structure of the V-shaped upper edge of the front end of the lip cylinder;
the lip front edge forming female die is detachably connected with the cylinder forming die and is used for assisting in forming the outer surface of the first U-shaped deep groove structure of the V-shaped upper edge of the front end of the lip cylinder.
Preferably, in the step S32, for the V-shaped single-shot lip part, the performing the distributing paving and the preliminary forming based on the forming mold includes the following steps:
S32-11, combining a middle support body and two side support bodies of the lip cylinder forming die, installing the combined middle support body and the two side support bodies on a die base, and then performing prepreg paving work of the lip cylinder on the lip cylinder forming die; during this period, a prepreg of the first extension and the first U-shaped deep groove structure region is reserved;
S32-12, installing extending molds at two sides of the lip, and performing prepreg paving work of the first extending section on the extending molds at two sides of the lip, wherein the reserved prepregs are prevented from adhering or accumulating during paving;
S32-13, installing a lip front edge paving male die, bending the reserved prepreg from the paved lip barrel area along the lip front edge paving male die, and paving, shaping and shaping to form a lip front edge flanging, namely a first U-shaped deep groove structure;
S32-14, installing a lip front edge forming female die to shape the first U-shaped deep groove structure;
S32-15, detaching the lip paving male die, and carrying out vacuum compression molding on the prepreg after paving; or paving the front edge of the lip onto the male die without disassembling the lip, and pre-pressing and molding the prepreg after paving by a mold.
Preferably, in the step S1, the structural arrangement of the W-shaped double-hair lip part includes the following steps:
S12-1, setting a lip barrel of the lip part to be of a hyperboloid structure under the condition that the unidirectional size of the lip part is larger than 1 m;
S12-2, on the basis of the axis of the lip part, the lip cylinder of the lip part is split from the rear end to the front end, and the split is sealed, so that the lip cylinder is in a left half structure and a right half structure with the front end integrally arranged;
S12-3, arranging the upper edge of the front end of the lip barrel in a W shape, and arranging the lower edge of the front end in a zigzag shape; two sides of the lower edge of the front end are provided with second extension sections which are in the same direction with the W shape of the upper edge of the front end;
S12-4, setting the cross section of the W-shaped upper edge at the front end of the lip barrel to be in a second U-shaped deep groove structure.
Preferably, in the step S2, for the W-shaped dual-lip part, the molding die includes a die base and two symmetrically arranged die units, each die unit includes a lip front edge molding die, a lip side edge extending die, a lip barrel molding die front section, a lip barrel molding die rear section, and a barrel positioning block;
Front-end bulges and rear-end bulges are respectively arranged at two ends of the rear section of the lip cylinder forming die, and the rear section of the lip cylinder forming die is split into at least two spliced bodies;
The front end of the front section of the lip barrel forming die is detachably connected with the die base, and the rear end of the lip barrel forming die is provided with an adapting groove which is matched with the front end bulge so as to relatively fix the front ends of all the spliced bodies;
the barrel positioning block is matched with the rear end bulge and is used for relatively fixing the rear ends of all the spliced bodies;
the front edge forming die of the lip is detachably connected with the front section of the front end forming die of the lip cylinder and is used for assisting in forming the W-shaped upper edge of the front end of the lip cylinder;
The lip side edge extending die is detachably connected with the die base and the lip front edge forming die and is used for assisting the second extending section of the W-shaped double-shot lip part to be formed.
Preferably, in the step S32, for the W-type double-emission lip part, the performing the distributing paving and the preliminary forming based on the forming mold includes the following steps:
s32-21, sequentially assembling a front section of a lip cylinder forming die, a rear section of the lip cylinder forming die, a cylinder positioning block and a lip side extending die based on a single die unit;
S32-22, paving a half of a lip cylinder body and a second extension section on one side of a W-shaped double-shot lip part on a current die unit; during this time, a prepreg of the second U-shaped deep groove structure region is reserved;
S32-23, installing a lip front edge forming die of the current die unit, bending the reserved prepreg from the paved lip barrel area along the lip front edge forming die, and paving, forming and shaping to form a lip front edge flanging, namely a second U-shaped deep groove structure;
s32-24, trimming and flattening redundant prepreg at the symmetrical surface of the current die unit;
S32-25, repeating the steps S32-21 to S32-24, and paving the other half structure of the W-shaped double-hair lip part;
s32-26, splicing the two die units with the W-shaped double-lip part structure, and fixing the die units through a die base;
S32-27, continuously and integrally paving multiple layers of prepregs on the surfaces of the front section of the lip cylinder forming die and the rear section of the lip cylinder forming die of the two die units, wherein the integral paving area is ended at the split position of the W-shaped double-shot lip part, and the butt joint position inside the split position is subjected to corner filling supplement according to operability.
Preferably, in the step S31, the mold pretreatment includes cleaning the surface of the mold, applying a release agent, and preheating the mold; material preparation involves preparing a prepreg from a carbon fiber composite material or a glass fiber composite material, and tailoring the prepreg.
Preferably, in the step S35, the finishing of the release product includes the steps of:
S351, polishing resin residual glue lines at the split mold and the spliced position of the mold aiming at the demolding product, and repairing local defects;
s352, carrying out theoretical line trimming on the demolding product by using a laser cutting or manual cutting mode, and completing working procedure operations including hole making and edge sealing.
The invention has the beneficial effects that:
The technical scheme provides a method for integrally forming a large-size complex-section lip composite material, which is suitable for integrally forming a large-size W-shaped double-shot lip part and a large-size V-shaped single-shot lip part.
According to the technical scheme, aiming at the first U-shaped deep groove structural characteristics of the V-shaped single-shot lip part, a step-by-step forming method of male die paving and female die forming is provided for the lip front edge area, the paving problem of the first U-shaped deep groove structure of the complex lip is solved, the die is designed to be divided into dies at the front end critical point, and the defect that the surface quality and the internal quality of the part are difficult to guarantee when the integral U-shaped die is adopted for paving is effectively solved.
According to the technical scheme, aiming at complex curved surface characteristics of the W-shaped double-shot lip part and narrow space characteristics between cylinders, a left-right sectional splicing structure mode is adopted to design a forming die mechanism, and the forming modes of single-cylinder parting, paving and double-cylinder involution curing are combined, so that the problem of integral shaping of the double-shot lip composite material is solved.
The technical scheme is based on the special die structure of the adaptation of part structural features, has the advantages of strong molding adaptability (being suitable for various large-size/oversized complicated cross sections and curved surface parts), easy control of the molding process, low cost and the like, and can effectively solve the problems that the numerical control, sheet metal, casting, 3D printing and other processing methods are difficult to mold, uneven in deformation, poor in local surface quality, high in cost and the like, and the advantages are quite remarkable. Meanwhile, the technology can be popularized and applied to other parts with similar characteristics, and has strong technical universality.
Drawings
Fig. 1 is a schematic view of the overall structure of a V-shaped single-shot lip part;
Fig. 2 is a schematic top view structure of a V-shaped single-shot lip part;
fig. 3 is a schematic front view of a V-shaped single-shot lip part;
fig. 4 is a schematic diagram of the overall structure of a V-shaped single-shot lip part forming mold;
fig. 5 is a schematic diagram of a paving structure of a V-shaped single-shot lip part on a forming die;
Fig. 6 is a schematic drawing of demolding of a V-shaped single shot lip part;
fig. 7 is a schematic view of the overall structure of a W-type double-hair lip part;
Fig. 8 is a schematic diagram of the front structure of a W-type double-hair lip part;
Fig. 9 is a schematic diagram of the overall structure of a W-type double-shot lip part forming mold;
fig. 10 is a schematic diagram of the placement of a W-type double-shot lip part on a molding die;
Fig. 11 is a schematic drawing of demolding of a W-type double-shot lip part.
In the figure:
1. A lip barrel; 2. the upper edge of the front end; 3. the lower edge of the front end; 4. a first extension; 5. a first U-shaped deep groove structure; 6. a second extension; 7. a second U-shaped deep groove structure; 8. a mold base; 9. forming die of lip barrel; 91. an intermediate support; 92. two side supporting bodies; 10. extending molds at two sides of the lip; 11. paving a male die on the front edge of the lip; 12. forming a female die at the front edge of the lip; 13. a mold unit; 131. forming die of lip front edge; 132. a lip side extension die; 133. a lip barrel forming die front section; 1331. an adaptation groove; 134. the back section of the lip barrel forming die; 1341. a splice body; 135. a cylinder positioning block; 14. a prepreg; 15. demolding a product; 16. and (5) splitting.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments.
Accordingly, the following detailed description of the invention, as provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment discloses a method for integrally forming a lip composite material with a large-size and complex section, which is taken as a basic implementation scheme of the technical scheme, and comprises the following steps:
s1, structural design of lip parts: designing a lip part structure according to stealth performance requirements; the type of the lip part comprises a V-shaped single-shot lip and a W-shaped double-shot lip.
S2, structural design of a forming die: and determining a model structure of the forming die according to the specific structure of the lip part, and dividing the splicing modules of the model structure of the forming die according to the lip type of the lip part.
S3, paving and forming parts, wherein the method comprises the following steps of:
s31, mold pretreatment and material preparation.
S32, sequentially carrying out distribution paving and preliminary forming work based on the forming die to obtain a lip part paving product.
S33, placing the product of paving the lip part into an autoclave for molding, and obtaining a product of hot-press molding of the lip part.
S34, based on the split joint module division of the forming die, the hot-press forming product of the lip part is demoulded step by step;
and S35, carrying out finish machining on the demolding product 15 to obtain a final lip part product.
Based on the implementation steps, the technical scheme realizes the integral molding of the lip part.
Example 2
The embodiment discloses a method for integrally forming a lip composite material with a large-size and complex section, which is a preferred implementation scheme of the technical scheme and comprises the following steps:
S1, structural design of lip parts: according to the stealth performance, the lip part structure is designed, in this embodiment, the type of the lip part is a V-shaped single-shot lip, as shown in fig. 1, and the structural arrangement of the V-shaped single-shot lip part includes the following steps:
S11-1, according to the starting performance requirement, under the condition that the unidirectional size of the lip part is larger than 1m, the lip cylinder body 1 of the lip part is set to be of a hyperboloid structure, the section size of the lip cylinder body 1 is not monotonically increased or decreased, but the section size of the lip cylinder body 1 is gradually increased after being gradually decreased along the axial direction, and the rear end size of the lip cylinder body 1 is smaller than the front end size.
S11-2, setting the upper edge 2 of the front end of the lip barrel 1 to be V-shaped and setting the lower edge 3 of the front end to be saw-tooth-shaped according to stealth performance requirements; the two sides of the front end lower edge 3 are provided with a first extension section 4 which is in the same direction as the front end upper edge 2V shape.
S11-3, the cross section of the V-shaped upper edge at the front end of the lip barrel 1 is provided with a first U-shaped deep groove structure 5. Further, the bottom of the first U-shaped deep groove structure 5 is an R-shaped transition, and the minimum value of R can be as low as 5mm.
S2, structural design of a forming die: and determining a model structure of the forming die according to the specific structure of the lip part, and dividing the splicing modules of the model structure of the forming die according to the lip type of the lip part.
S3, paving and forming parts, wherein the method comprises the following steps of:
s31, mold pretreatment and material preparation.
S32, sequentially carrying out distribution paving and preliminary forming work based on the forming die to obtain a lip part paving product.
S33, placing the product of paving the lip part into an autoclave for molding, and obtaining a product of hot-press molding of the lip part.
S34, based on the split joint module division of the forming die, the hot-press forming product of the lip part is demoulded step by step.
And S35, carrying out finish machining on the demolding product 15 to obtain a final lip part product.
Example 3
The embodiment discloses a method for integrally forming a lip composite material with a large-size and complex section, which is a preferred implementation scheme of the technical scheme and comprises the following steps:
S1, structural design of lip parts: according to the stealth performance, the lip part structure is designed, in this embodiment, the type of the lip part is a V-shaped single-shot lip, as shown in fig. 1, and the structural arrangement of the V-shaped single-shot lip part includes the following steps:
s11-1, under the condition that the unidirectional size of the lip part is larger than 1m, setting the lip cylinder body 1 of the lip part into a hyperboloid structure, gradually decreasing the section size of the lip cylinder body 1 along the axial direction and gradually increasing the section size, and enabling the rear end size of the lip cylinder body 1 to be smaller than the front end size.
S11-2, arranging the upper edge 2 of the front end of the lip barrel 1 to be V-shaped, and arranging the lower edge 3 of the front end to be saw-tooth-shaped; the two sides of the front end lower edge 3 are provided with a first extension section 4 which is in the same direction as the front end upper edge 2V shape; further, as shown in fig. 2, the V-shaped included angle of the front upper edge 2 is 110 °; the included angle of the saw teeth is 110 degrees.
S11-3, the cross section of the V-shaped upper edge at the front end of the lip barrel 1 is provided with a first U-shaped deep groove structure 5 (see A-A cross section structure in fig. 3).
S2, structural design of a forming die: and determining a model structure of the forming die according to the specific structure of the lip part, and dividing the splicing modules of the model structure of the forming die according to the lip type of the lip part. The structural design of the forming die comprises two major core elements, namely a die is divided at the critical point of the forefront end of the first U-shaped deep groove structure 5 of the V-shaped upper edge of the front end of the lip barrel 1 by the forming die, and the die is divided according to the cross section shape of the lip barrel 1 by the forming die. Based on this, in this example, as shown in fig. 4, for the V-shaped single-shot lip part, the molding die thereof includes a die base 8, a lip cylinder molding die 9, a lip both-side extending die 10, a lip leading edge lay-up male die 11, and a lip leading edge molding female die 12.
The mold base 8 is of a platform type structure, can be safely and stably laid on the ground, and an operator can freely stand on the mold base 8 to perform the laying work of the prepreg 14. One side of the die base 8 is provided with positioning holes according to the distribution of other die modules, and can be simply combined or decomposed with other die modules through pins and bolt groups.
The lip cylinder forming die 9 is detachably connected with the die base 8, the lip cylinder forming die 9 is designed to be a left die, a middle die and a right die, the separating surface of the lip cylinder forming die 9 is trapezoid, and smooth demolding can be ensured under the condition that the middle of the shape surface of the lip cylinder 1 along the length direction is thin and thick. In summary, the lip cylinder forming die 9 includes a middle supporting body 91 and left and right two side supporting bodies 92, where the middle supporting body 91 is matched with the two side supporting bodies 92 in a spliced manner, so as to assist in forming the lip cylinder 1, and the outer surface of the lip cylinder forming die 9 is a film-sticking surface, so as to ensure the quality of the inner cavity of the lip cylinder 1 and the lower surface of the first U-shaped deep groove structure 5.
The extending molds 10 on two sides of the lip are detachably connected with the mold base 8 and the barrel forming mold and are used for assisting the forming of the first extending section 4 of the V-shaped single-shot lip.
After the laying of the lip cylinder 1 is completed based on the cylinder molding, a lip front edge laying male die 11 is detachably connected with a cylinder molding die and is used for carrying out the laying of a first U-shaped deep groove structure 5 of the V-shaped upper edge of the front end of the lip cylinder 1 after the prepreg 14 is turned over, and the lip front edge laying male die 11 is formed by inwards shifting the lip thickness of the first U-shaped deep groove structure 5 (see A-A cross section structure in fig. 3). To sum up. The front edge of the lip is paved with a male die 11 for assisting the inner surface forming of the first U-shaped deep groove structure 5 of the V-shaped upper edge of the front end of the lip cylinder 1.
After the front edge of the first U-shaped deep groove structure 5 is paved, the lip front edge forming female die 12 is detachably connected with the cylinder forming die and is used for assisting the outer surface forming of the first U-shaped deep groove structure 5 of the V-shaped upper edge of the front end of the lip cylinder 1 so as to ensure the outer surface quality of the first U-shaped deep groove structure 5. Specific: after being spliced with the lip cylinder forming die 9, the lip front edge forming female die 12 and the lip cylinder forming die 9 form an outline surface of the front edge of the first U-shaped deep groove structure 5, and the interface of the two is the forefront critical point of the front edge of the first U-shaped deep groove structure 5.
S3, paving and forming parts, wherein the method comprises the following steps of:
S31, mold pretreatment and material preparation;
s32, sequentially carrying out distribution paving and preliminary forming work based on a forming die to obtain a lip part paving product;
s33, placing the paving product of the lip part into an autoclave for molding to obtain a hot-press molded product of the lip part;
S34, based on the split joint module division of the forming die, the hot-press forming product of the lip part is demoulded step by step;
and S35, carrying out finish machining on the demolding product 15 to obtain a final lip part product.
Example 4
The embodiment discloses a method for integrally forming a lip composite material with a large-size and complex section, which is a preferred implementation scheme of the technical scheme and comprises the following steps:
s1, structural design of lip parts: according to the stealth performance, a lip part structure is designed, in the embodiment, the type of the lip part is a V-shaped single-shot lip, and the structure setting of the V-shaped single-shot lip part comprises the following steps:
s11-1, under the condition that the unidirectional size of the lip part is larger than 1m, setting the lip cylinder body 1 of the lip part into a hyperboloid structure, gradually decreasing the section size of the lip cylinder body 1 along the axial direction and gradually increasing the section size, and enabling the rear end size of the lip cylinder body 1 to be smaller than the front end size.
S11-2, arranging the upper edge 2 of the front end of the lip barrel 1 to be V-shaped, and arranging the lower edge 3 of the front end to be saw-tooth-shaped; the two sides of the front end lower edge 3 are provided with a first extension section 4 which is in the same direction as the front end upper edge 2V shape; further, the V-shaped included angle of the front upper edge 2 is 110 degrees; the included angle of the saw teeth is 110 degrees;
S11-3, the cross section of the V-shaped upper edge at the front end of the lip barrel 1 is provided with a first U-shaped deep groove structure 5.
S2, structural design of a forming die: and determining a model structure of the forming die according to the specific structure of the lip part, and dividing the splicing modules of the model structure of the forming die according to the lip type of the lip part. In this example, for the V-shaped single-shot lip part, the molding die thereof comprises a die base 8, a lip barrel molding die 9, a lip both-side extending die 10, a lip front edge laying male die 11 and a lip front edge molding female die 12.
The lip cylinder forming die 9 is detachably connected with the die base 8 and comprises a middle supporting body 91 and left and right two side supporting bodies 92, and the middle supporting body 91 is spliced and matched with the two side supporting bodies 92 and used for assisting in forming the lip cylinder 1.
The extending molds 10 on two sides of the lip are detachably connected with the mold base 8 and the barrel forming mold and are used for assisting the forming of the first extending section 4 of the V-shaped single-shot lip.
The male die 11 is detachably connected with the cylinder forming die and used for assisting in forming the inner surface of the first U-shaped deep groove structure 5 of the V-shaped upper edge of the front end of the lip cylinder 1.
The lip front edge forming female die 12 is detachably connected with the cylinder forming die and is used for assisting the forming of the outer surface of the first U-shaped deep groove structure 5 of the V-shaped upper edge of the front end of the lip cylinder 1.
S3, paving and forming parts, wherein the method comprises the following steps of:
s31, mold pretreatment and material preparation.
S32, sequentially carrying out distribution paving and preliminary forming work based on a forming die to obtain a lip part paving product; in this embodiment, as shown in fig. 5, for the V-shaped single-shot lip part, the performing of the distribution paving and the preliminary forming based on the forming mold includes the following steps:
S32-11, combining a middle support body 91 and two side support bodies 92 of the lip cylinder forming die 9, installing the combined lip cylinder forming die on the die base 8, and then paving the prepreg 14 of the lip cylinder 1 on the lip cylinder forming die 9; during this, prepreg 14 is reserved for the first extension 4 and the first U-shaped deep groove structure 5 area.
S32-12, installing the extending molds 10 on two sides of the lip, and paving the prepreg 14 of the first extending section 4 on the extending molds 10 on two sides of the lip, wherein the reserved prepreg 14 is prevented from being adhered or piled up during paving.
S32-13, installing a lip front edge paving male die 11, bending the reserved prepreg 14 from the paved lip barrel 1 area along the lip front edge paving male die 11, and then paving, shaping and shaping to form a lip front edge flanging, namely the first U-shaped deep groove structure 5.
S32-14, installing a lip front edge forming female die 12 to shape the first U-shaped deep groove structure 5.
S32-15, detaching the lip paving male die, and forming the prepreg 14 after paving by vacuum pressurization; or the lip front edge is not disassembled to be paved on the male die 11, and the prepreg 14 which is paved is formed by pre-pressing and compression molding of a die.
S33, placing the product of paving the lip part into an autoclave for molding, and obtaining a product of hot-press molding of the lip part.
S34, as shown in FIG. 6, the hot-press molding products of the lip parts are demoulded step by step based on the split module division of the molding die. Specific: ① Paving a male die 11 on the front edge of the decomposed lip; ② Decomposing the lip front edge to form a female die 12; ③ Maintaining the extending molds 10 on two sides of the lips and the middle section of the lip cylinder forming mold 9 to be fixed, and simultaneously drawing out the demolding product 15 and the lip cylinder forming mold 9 left/right along the axis for a certain distance; ④ The release product 15 is left/right extracted from the lip cylinder molding die 9.
And S35, carrying out finish machining on the demolding product 15 to obtain a final lip part product.
Example 5
The embodiment discloses a method for integrally forming a lip composite material with a large-size and complex section, which is a preferred implementation scheme of the technical scheme and comprises the following steps:
s1, structural design of lip parts: according to the stealth performance, a lip part structure is designed, and in the embodiment, the type of the lip part is a W-shaped double-shot lip. Based on this, as shown in fig. 7, for the W-type double-hair lip part, the structural arrangement thereof includes the steps of:
S12-1, setting the lip barrel 1 of the lip part to be of a hyperboloid structure under the condition that the unidirectional size of the lip part is larger than 1 m.
S12-2, based on the axis of the lip part, the lip cylinder body 1 of the lip part is arranged from the rear end to the front end in a split 16, and the split 16 is arranged in a sealing way, so that the lip cylinder body 1 is in a left half structure and a right half structure with the front end integrally arranged.
S12-3, arranging the upper edge 2 of the front end of the lip barrel 1 to be W-shaped, and arranging the lower edge 3 of the front end to be saw-tooth-shaped; two sides of the front end lower edge 3 are provided with second extension sections 6 which are in the same direction as the front end upper edge 2W type.
S12-4, setting the cross section of the W-shaped upper edge of the front end of the lip barrel 1 to be a second U-shaped deep groove structure 7, and further, setting the bottom of the deep groove of the second U-shaped deep groove structure 7 to be R-shaped transition.
S2, structural design of a forming die: and determining a model structure of the forming die according to the specific structure of the lip part, and dividing the splicing modules of the model structure of the forming die according to the lip type of the lip part.
S3, paving and forming parts, wherein the method comprises the following steps of:
S31, mold pretreatment and material preparation;
s32, sequentially carrying out distribution paving and preliminary forming work based on a forming die to obtain a lip part paving product;
s33, placing the paving product of the lip part into an autoclave for molding to obtain a hot-press molded product of the lip part;
S34, based on the split joint module division of the forming die, the hot-press forming product of the lip part is demoulded step by step;
and S35, carrying out finish machining on the demolding product 15 to obtain a final lip part product.
Example 6
The embodiment discloses a method for integrally forming a lip composite material with a large-size and complex section, which is a preferred implementation scheme of the technical scheme and comprises the following steps:
s1, structural design of lip parts: according to the stealth performance, a lip part structure is designed, and in the embodiment, the type of the lip part is a W-shaped double-shot lip. Based on the above, the structural arrangement of the W-shaped double-hair lip part comprises the following steps:
S12-1, setting the lip barrel 1 of the lip part to be of a hyperboloid structure under the condition that the unidirectional size of the lip part is larger than 1 m.
S12-2, on the basis of the axis of the lip part, a lip cylinder body 1 of the lip part is arranged from the rear end to the front end in a split 16, and the split 16 is arranged in a sealing way, so that the lip cylinder body 1 is in a left half structure and a right half structure with the front end integrally arranged;
s12-3, arranging the upper edge 2 of the front end of the lip barrel 1 to be W-shaped, and arranging the lower edge 3 of the front end to be saw-tooth-shaped; two sides of the front end lower edge 3 are provided with second extension sections 6 which are in the same direction as the front end upper edge 2W type.
S12-4, the cross section of the W-shaped upper edge of the front end of the lip barrel 1 is provided with a second U-shaped deep groove structure 7 (see a B-B cross section structure in FIG. 8).
S2, structural design of a forming die: and determining a model structure of the forming die according to the specific structure of the lip part, and dividing the splicing modules of the model structure of the forming die according to the lip type of the lip part. The core key points of the structural design of the forming die are as follows: at the bilateral symmetry plane of the lip, the mold is divided into a left half and a right half, the mold on one side adopts a block design, and the mold on the left side and the mold on the right side can form the integral molding mold of the lip after being combined. Based on this, as shown in fig. 9, in the present embodiment, for the W-shaped double-shot lip part, the molding die includes the die base 8 and two symmetrically disposed die units 13, each die unit 13 includes a lip front edge molding die 131, a lip side edge extension die 132, a lip barrel molding die front section 133, a lip barrel molding die rear section 134, and a barrel positioning block 135.
The front end bulge and the rear end bulge are respectively arranged at two ends of the rear section 134 of the lip cylinder forming die, and the rear section 134 of the lip cylinder forming die is split into at least two splice bodies 1341.
The front end of the front section 133 of the lip barrel forming die is detachably connected with the die base 8, and the rear end is provided with an adapting groove 1331, and the adapting groove 1331 is matched with the front end bulge so as to relatively fix the front ends of all the splice bodies 1341.
The cylinder positioning block 135 is engaged with the rear end protrusion, so as to fix the rear ends of all the splice bodies 1341 relatively.
The front edge forming die 131 of the lip is detachably connected with the front section 133 of the front end forming die of the lip cylinder, and is used for assisting in forming the W-shaped upper edge of the front end of the lip cylinder 1. In addition, the separation surface of the lip front edge forming die 131 and the lip barrel forming die front section 133 is designed as the front edge most front critical point of the second U-shaped deep groove structure 7 (see B-B directional cross-sectional structure in fig. 8).
The lip side extending die 132 is detachably connected with the die base 8 and the lip front edge forming die 131, and is used for assisting the forming of the second extending section 6 of the W-shaped double-hair lip part.
S3, paving and forming parts, wherein the method comprises the following steps of:
S31, mold pretreatment and material preparation;
s32, sequentially carrying out distribution paving and preliminary forming work based on a forming die to obtain a lip part paving product;
s33, placing the paving product of the lip part into an autoclave for molding to obtain a hot-press molded product of the lip part;
S34, based on the split joint module division of the forming die, the hot-press forming product of the lip part is demoulded step by step;
and S35, carrying out finish machining on the demolding product 15 to obtain a final lip part product.
Example 7
The embodiment discloses a method for integrally forming a lip composite material with a large-size and complex section, which is a preferred implementation scheme of the technical scheme and comprises the following steps:
s1, structural design of lip parts: according to the stealth performance, a lip part structure is designed, and in the embodiment, the type of the lip part is a W-shaped double-shot lip. Based on the above, the structural arrangement of the W-shaped double-hair lip part comprises the following steps:
S12-1, setting the lip barrel 1 of the lip part to be of a hyperboloid structure under the condition that the unidirectional size of the lip part is larger than 1 m.
S12-2, based on the axis of the lip part, the lip cylinder body 1 of the lip part is arranged from the rear end to the front end in a split 16, and the split 16 is arranged in a sealing way, so that the lip cylinder body 1 is in a left half structure and a right half structure with the front end integrally arranged.
S12-3, arranging the upper edge 2 of the front end of the lip barrel 1 to be W-shaped, and arranging the lower edge 3 of the front end to be saw-tooth-shaped; two sides of the front end lower edge 3 are provided with second extension sections 6 which are in the same direction as the front end upper edge 2W type.
S12-4, setting the cross section of the W-shaped upper edge of the front end of the lip barrel 1 to be a second U-shaped deep groove structure 7.
S2, structural design of a forming die: and determining a model structure of the forming die according to the specific structure of the lip part, and dividing the splicing modules of the model structure of the forming die according to the lip type of the lip part. In this embodiment, for the W-shaped dual-lip part, the molding mold includes a mold base 8 and two mold units 13 symmetrically disposed left and right, and each mold unit 13 includes a lip front edge molding mold 131, a lip side edge extension mold 132, a lip barrel molding front section 133, a lip barrel molding rear section 134, and a barrel positioning block 135.
The front end bulge and the rear end bulge are respectively arranged at two ends of the rear section 134 of the lip cylinder forming die, and the rear section 134 of the lip cylinder forming die is split into at least two splice bodies 1341.
The front end of the front section 133 of the lip barrel forming die is detachably connected with the die base 8, and the rear end is provided with an adapting groove 1331, and the adapting groove 1331 is matched with the front end bulge so as to relatively fix the front ends of all the splice bodies 1341.
The cylinder positioning block 135 is engaged with the rear end protrusion, so as to fix the rear ends of all the splice bodies 1341 relatively.
The front edge forming die 131 of the lip is detachably connected with the front section 133 of the front end forming die of the lip cylinder, and is used for assisting in forming the W-shaped upper edge of the front end of the lip cylinder 1.
The lip side extending die 132 is detachably connected with the die base 8 and the lip front edge forming die 131, and is used for assisting the forming of the second extending section 6 of the W-shaped double-hair lip part.
S3, paving and forming parts, wherein the core elements are as follows: in the paving process of the W-shaped double-hair lip part, the cylinder body is divided into a left single cylinder and a right single cylinder, the left single cylinder is paved and stuck with the inner layer of the lip, the left single cylinder and the right single cylinder are combined, and then the whole paving and sticking of the outer layer of the lip is carried out to form a whole structure. Based on this, the part lay-up molding comprises the steps of:
s31, mold pretreatment and material preparation.
S32, as shown in fig. 10, distributing and paving and preliminary forming work are sequentially carried out based on a forming die, and a lip part paving product is obtained. In this embodiment, for the W-type double-hair lip part, the implementation of the distribution paving and the preliminary forming based on the forming mold includes the following steps:
S32-21, based on the single die unit 13, sequentially assembling a lip cylinder forming die front section 133, a lip cylinder forming die rear section 134, a cylinder positioning block 135 and a lip side extending die 132.
S32-22, paving a half of the lip cylinder body 1 and a second extension section 6 on one side of the W-shaped double-shot lip part on the current die unit 13; during this, prepreg 14 is reserved in the region of the second U-shaped deep groove structure 7.
S32-23, installing a lip front edge forming die 131 of the current die unit 13, bending the reserved prepreg 14 from the paved lip barrel 1 area along the lip front edge forming die 131, and then paving, forming and shaping to form a lip front edge flanging, namely the second U-shaped deep groove structure 7.
And S32-24, trimming and flattening the redundant prepreg 14 at the symmetrical plane of the current die unit 13.
S32-25, repeating the steps S32-21 to S32-24, and paving the other half structure of the W-shaped double-hair lip part.
S32-26, splicing the two die units 13 with the W-shaped double-lip part structure, and fixing the two die units through the die base 8.
And S32-27, continuously and integrally paving a plurality of layers of prepregs 14 on the surfaces of the front section 133 and the rear section 134 of the lip barrel forming die of the two die units 13, wherein the integral paving area is ended at the position of the Y-shaped double-hair lip part split 16, and the butt joint inside the split 16 is subjected to corner filling supplement according to operability.
S33, placing the product of paving the lip part into an autoclave for molding, and obtaining a product of hot-press molding of the lip part.
S34, as shown in FIG. 11, the hot-press molding products of the lip parts are demoulded step by step based on the split module division of the molding die. Specific: ① Decomposing the lip front edge forming die 131; ② A positioning block of the forming die of the decomposing cylinder; ③ Simultaneously withdrawing the demolding product 15 and the lip barrel molding die rear section 134 (left/right) along the axis; ④ The lip cylinder molding rear section 134 is withdrawn from the release product 15.
And S35, carrying out finish machining on the demolding product 15 to obtain a final lip part product.
Example 8
The embodiment discloses a method for integrally forming a lip composite material with a large-size and complex section, which is taken as a basic implementation scheme of the technical scheme, and comprises the following steps:
s1, structural design of lip parts: designing a lip part structure according to stealth performance requirements; the type of the lip part comprises a V-shaped single-shot lip and a W-shaped double-shot lip.
S2, structural design of a forming die: and determining a model structure of the forming die according to the specific structure of the lip part, and dividing the splicing modules of the model structure of the forming die according to the lip type of the lip part.
S3, paving and forming parts, wherein the method comprises the following steps of:
S31, mold pretreatment and material preparation; the mold pretreatment comprises cleaning the surface of the mold, smearing a release agent and preheating the mold; the material preparation includes preparing the prepreg 14 using a carbon fiber composite material or a glass fiber composite material, and cutting the prepreg 14.
S32, sequentially carrying out distribution paving and preliminary forming work based on the forming die to obtain a lip part paving product.
S33, placing the product of paving the lip part into an autoclave for molding, and obtaining a product of hot-press molding of the lip part.
S34, based on the split joint module division of the forming die, the hot-press forming product of the lip part is demoulded step by step.
And S35, carrying out finish machining on the demolding product 15 to obtain a final lip part product. Specifically, the finishing of the release product 15 includes the steps of:
S351, polishing resin residual glue lines at the positions of die parting and die splicing aiming at the demolding product 15, and repairing local defects.
And S352, carrying out theoretical line trimming on the demolding product 15 by using a laser cutting or manual cutting mode, and completing working procedure operations including hole making and edge sealing.
Claims (7)
1. The integral forming method of the lip mouth composite material with the large size and the complex section is characterized by comprising the following steps of:
s1, structural design of lip parts: designing a lip part structure according to stealth performance requirements; the structure setting of the V-shaped single-shot lip comprises the following steps:
S11-1, setting a lip barrel (1) of the lip part to be of a hyperboloid structure under the condition that the unidirectional size of the lip part is larger than 1m, wherein the section size of the lip barrel (1) gradually decreases along the axial direction and then gradually increases, and the rear end size of the lip barrel (1) is smaller than the front end size;
S11-2, arranging the upper edge (2) of the front end of the lip barrel (1) to be V-shaped, and arranging the lower edge (3) of the front end to be zigzag; the two sides of the front end lower edge (3) are provided with a first extension section (4) which is in the same direction with the V shape of the front end upper edge (2);
S11-3, arranging the cross section of the V-shaped upper edge at the front end of the lip barrel (1) into a first U-shaped deep groove structure (5);
S2, structural design of a forming die: determining a model structure of a forming die according to the specific structure of the lip part, and dividing a splicing module of the model structure of the forming die according to the type of the lip part; the forming die of the V-shaped single-shot lip part comprises a die base (8), a lip barrel forming die (9), extending dies (10) on two sides of a lip, a male die (11) for paving the front edge of the lip and a female die (12) for forming the front edge of the lip;
the lip cylinder forming die (9) is detachably connected with the die base (8) and comprises a middle supporting body (91) and left and right two side supporting bodies (92), and the middle supporting body (91) is spliced and matched with the two side supporting bodies (92) and is used for assisting in forming the lip cylinder (1);
The extending molds (10) on two sides of the lip are detachably connected with the mold base (8) and the barrel forming mold and are used for assisting the forming of the first extending section (4) of the V-shaped single-shot lip;
the male die (11) is paved on the front edge of the lip and detachably connected with the cylinder forming die, and is used for assisting the inner surface forming of the first U-shaped deep groove structure (5) of the V-shaped upper edge at the front end of the lip cylinder (1);
the lip front edge forming female die (12) is detachably connected with the cylinder forming die and is used for assisting in forming the outer surface of the first U-shaped deep groove structure (5) of the V-shaped upper edge of the front end of the lip cylinder (1);
s3, paving and forming parts, wherein the method comprises the following steps of:
S31, mold pretreatment and material preparation;
S32, sequentially carrying out distribution paving and preliminary forming work based on a forming die to obtain a lip part paving product; the method comprises the following steps of:
s32-11, combining a middle support body (91) and two side support bodies (92) of the lip cylinder forming die (9), installing the combined lip cylinder forming die on a die base (8), and then paving prepreg (14) of the lip cylinder (1) on the lip cylinder forming die (9); during this period, a prepreg (14) is reserved for the first extension (4) and the first U-shaped deep groove structure (5) area;
s32-12, installing extension molds (10) at two sides of a lip, and paving the prepreg (14) of the first extension section (4) on the extension molds (10) at two sides of the lip, wherein the reserved prepreg (14) is prevented from adhering or accumulating during paving;
S32-13, installing a lip front edge paving male die (11), bending a reserved prepreg (14) from a paved lip barrel (1) area along the lip front edge paving male die (11), and paving, shaping and shaping to form a lip front edge flanging, namely a first U-shaped deep groove structure (5);
s32-14, installing a lip front edge forming female die (12) to shape the first U-shaped deep groove structure (5);
s32-15, detaching the lip paving male die, and forming the prepreg (14) which is paved by vacuum pressurization; or the front edge of the lip is not disassembled to be paved with a male die (11), and the prepreg (14) which is paved is formed by pre-pressing and compression molding of a die;
s33, placing the paving product of the lip part into an autoclave for molding to obtain a hot-press molded product of the lip part;
S34, based on the split joint module division of the forming die, the hot-press forming product of the lip part is demoulded step by step;
And S35, carrying out finish machining on the demolding product (15) to obtain a final lip part product.
2. The method for integrally forming a large-size complex-section lip composite material according to claim 1, wherein in the step S11-2, the V-shaped included angle of the upper edge (2) of the front end is 110 °; the included angle of the saw teeth is 110 degrees.
3. The method for integrally forming a large-size complex-section lip composite material according to claim 1, wherein in the step S31, the mold pretreatment includes cleaning the mold surface, applying a mold release agent, and preheating the mold; the material preparation includes preparing a prepreg (14) from a carbon fiber composite material or a glass fiber composite material, and cutting the prepreg (14).
4. A method for integrally forming a large-sized complex-section lip composite according to claim 1, wherein in the step S35, the finishing of the release product (15) comprises the steps of:
s351, polishing resin residual glue lines at the split positions of the die and the die aiming at the demolding product (15), and repairing local defects;
S352, carrying out theoretical line trimming on the demolding product (15) by using a laser cutting or manual cutting mode, and completing working procedure operations including hole making and edge sealing.
5. The integral forming method of the lip mouth composite material with the large size and the complex section is characterized by comprising the following steps of:
S1, structural design of lip parts: designing a lip part structure according to stealth performance requirements; the type of the lip part is a W-shaped double-shot lip, and the structural arrangement comprises the following steps:
s12-1, setting a lip barrel (1) of the lip part to be of a hyperboloid structure under the condition that the unidirectional size of the lip part is larger than 1 m;
S12-2, on the basis of the axis of the lip part, a lip cylinder (1) of the lip part is arranged from the rear end to the front end in a split way (16), and the split way (16) is arranged in a sealing way, so that the lip cylinder (1) is in a left-right half structure with the front end integrally arranged;
s12-3, arranging the upper edge (2) of the front end of the lip barrel (1) to be W-shaped, and arranging the lower edge (3) of the front end to be saw-tooth-shaped; two sides of the front end lower edge (3) are provided with second extension sections (6) which are in the same direction with the W shape of the front end upper edge (2);
S12-4, setting the cross section of the W-shaped upper edge at the front end of the lip barrel (1) to be a second U-shaped deep groove structure (7);
s2, structural design of a forming die: determining a model structure of a forming die according to the specific structure of the lip part, and dividing a splicing module of the model structure of the forming die according to the type of the lip part; the forming die of the W-shaped double-shot lip part comprises a die base (8) and two die units (13) which are symmetrically arranged left and right, wherein each die unit (13) comprises a lip front edge forming die (131), a lip side edge extending die (132), a lip barrel forming die front section (133), a lip barrel forming die rear section (134) and a barrel positioning block (135);
Front-end bulges and rear-end bulges are respectively arranged at two ends of the back section (134) of the lip cylinder forming die, and the back section (134) of the lip cylinder forming die is split into at least two splice bodies (1341);
The front end of the front section (133) of the lip barrel forming die is detachably connected with the die base (8), the rear end of the front section is provided with an adapting groove (1331), and the adapting groove (1331) is matched with the front end bulge so as to relatively fix the front ends of all splice bodies (1341);
The cylinder positioning blocks (135) are matched with the rear end protrusions and are used for relatively fixing the rear ends of all the spliced bodies (1341);
The lip front edge forming die (131) is detachably connected with the front section (133) of the lip barrel forming die and is used for assisting in forming the W-shaped upper edge at the front end of the lip barrel (1);
The lip side edge extension die (132) is detachably connected with the die base (8) and the lip front edge forming die (131) and is used for assisting the forming of a second extension section (6) of the W-shaped double-hair lip part;
s3, paving and forming parts, wherein the method comprises the following steps of:
S31, mold pretreatment and material preparation;
s32, sequentially carrying out distribution paving and preliminary forming work based on a forming die to obtain a lip part paving product; the method comprises the following steps of:
S32-21, based on a single die unit (13), sequentially assembling a front section (133) of a lip cylinder forming die, a rear section (134) of the lip cylinder forming die, a cylinder positioning block (135) and a lip side extending die (132);
S32-22, paving a half of a lip cylinder (1) and a second extension section (6) on one side of a W-shaped double-hair lip part on the current die unit (13); during this time, a prepreg (14) of the second U-shaped deep groove structure (7) region is reserved;
S32-23, installing a lip front edge forming die (131) of the current die unit (13), bending the reserved prepreg (14) from the paved lip barrel (1) area along the lip front edge forming die (131), and then paving, forming and shaping to form a lip front edge flanging, namely a second U-shaped deep groove structure (7);
s32-24, trimming and flattening redundant prepreg (14) at the symmetrical surface of the current die unit (13);
S32-25, repeating the steps S32-21 to S32-24, and paving the other half structure of the W-shaped double-hair lip part;
s32-26, splicing the two die units (13) with the W-shaped double-lip part structure, and fixing the two die units through the die base (8);
s32-27, continuously and integrally paving a plurality of layers of prepregs (14) on the surfaces of a front section (133) and a rear section (134) of a lip barrel forming die of the two die units (13), wherein the integral paving area is ended at a position of a Y-shaped double-lip part split (16), and the butt joint inside the split (16) is subjected to corner filling supplement according to operability;
s33, placing the paving product of the lip part into an autoclave for molding to obtain a hot-press molded product of the lip part;
S34, based on the split joint module division of the forming die, the hot-press forming product of the lip part is demoulded step by step;
And S35, carrying out finish machining on the demolding product (15) to obtain a final lip part product.
6. The method for integrally forming a large-size complex-section lip composite material as claimed in claim 5, wherein in the step S31, the mold pretreatment includes cleaning the mold surface, applying a mold release agent, and preheating the mold; the material preparation includes preparing a prepreg (14) from a carbon fiber composite material or a glass fiber composite material, and cutting the prepreg (14).
7. A method for integrally forming a large-sized complex-section lip composite material according to claim 5, wherein in said step S35, finishing the release product (15) comprises the steps of:
s351, polishing resin residual glue lines at the split positions of the die and the die aiming at the demolding product (15), and repairing local defects;
S352, carrying out theoretical line trimming on the demolding product (15) by using a laser cutting or manual cutting mode, and completing working procedure operations including hole making and edge sealing.
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| CN110228213A (en) * | 2019-07-19 | 2019-09-13 | 威海光威复合材料股份有限公司 | The autoclave molding method of composite material inlet lip |
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| US4121606A (en) * | 1977-10-25 | 1978-10-24 | General Dynamics Corporation | Inflatable air inlet duct |
| IT1196772B (en) * | 1986-10-24 | 1988-11-25 | Siai Marchetti Spa | METHOD FOR THE PRODUCTION OF COMPOSITE SYNTHETIC MATERIAL DUCTS FOR AIRCRAFT AIR INTAKES |
| RU2297370C1 (en) * | 2005-10-24 | 2007-04-20 | Открытое акционерное общество Центральный научно-исследовательский институт специального машиностроения | Flying vehicle air intake |
| RU2348570C1 (en) * | 2007-09-04 | 2009-03-10 | Открытое акционерное общество Центральный научно-исследовательский институт специального машиностроения | Method of making aircraft engine air intake from laminar composite materials and aircraft engine air intake |
| FR2977827B1 (en) * | 2011-07-13 | 2015-03-13 | Snecma | PROCESS FOR MANUFACTURING A TURBOMACHINE BLOWER HOUSING WITH ABRADABLE AND ACOUSTIC COATINGS |
| CN206050085U (en) * | 2016-08-29 | 2017-03-29 | 成都飞机工业（集团）有限责任公司 | A kind of stealthy lip of aircraft |
| DE102016013115A1 (en) * | 2016-11-03 | 2018-05-03 | Diehl Aircabin Gmbh | Manufacturing method for an air duct of an aircraft |
| CN212535862U (en) * | 2020-06-23 | 2021-02-12 | 北京金朋达航空科技有限公司 | Clam type air inlet channel and forming die thereof |
| CN213035065U (en) * | 2020-07-01 | 2021-04-23 | 北京金朋达航空科技有限公司 | S-shaped air inlet channel forming die and S-shaped air inlet channel |
| CN115447792B (en) * | 2022-10-12 | 2024-09-06 | 中国航空工业集团公司西安飞机设计研究所 | An air inlet with an integrally formed lip of aircraft composite materials |
| CN116811289A (en) * | 2023-04-28 | 2023-09-29 | 航天海鹰(镇江)特种材料有限公司 | Shaping tool for S-shaped air inlet channel of airplane and design and use method thereof |
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