CN114179396B - Forming method and die suitable for irregular U-shaped composite material foam sandwich structural member - Google Patents
Forming method and die suitable for irregular U-shaped composite material foam sandwich structural member Download PDFInfo
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- CN114179396B CN114179396B CN202111546556.7A CN202111546556A CN114179396B CN 114179396 B CN114179396 B CN 114179396B CN 202111546556 A CN202111546556 A CN 202111546556A CN 114179396 B CN114179396 B CN 114179396B
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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
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
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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
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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
- B29L2031/3097—Cosmonautical vehicles; Rockets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Abstract
The invention discloses a forming method and a die suitable for an irregular U-shaped composite material foam sandwich structural member, comprising the following steps of: s1, manufacturing a mould, S2, manufacturing a foam core, S3, paving an outer skin on an outer skin paving mould, and sending the outer skin into an autoclave for curing and forming to obtain a cured outer skin assembly; s4, paving the inner skin on the inner skin paving mold and paving the foam core to obtain an uncured inner skin assembly; s5, assembling the cured outer skin assembly and the uncured inner skin assembly by utilizing an assembly forming die to obtain an assembly forming body; s6, sending the assembled forming body into an autoclave for curing and forming to obtain the foam sandwich structural member. The invention adopts the co-cementing process and the matched forming die to effectively reduce the operation difficulty of the parts in the manufacturing process, not only can ensure the internal quality of the cementing of the parts, the accuracy of the foam core position and the surface quality, but also can improve the qualification rate and the production efficiency of the parts.
Description
Technical Field
The invention belongs to the field of cementing of composite material foam sandwich structural members, and particularly relates to a forming method and a die suitable for an irregular U-shaped composite material foam sandwich structural member.
Background
The composite material foam sandwich structure has the characteristics of light weight, high bearing capacity and the like, so that the composite material foam sandwich structure is widely applied to the field of aerospace, and particularly the large-scale composite material component for aviation is also often provided with a foam sandwich structure. The part of the composite material is an irregular U-shaped foam sandwich structural member, as shown in figure 1, the composite material foam sandwich structural member consists of an inner composite material skin, an outer composite material skin and a foam core, the height of the part in the length direction is gradually reduced, the opening size is also reduced along with the height of the part, and the two sides of the part are not equal in length. In addition, the outer surface of the part is a pneumatic molded surface, and the surface is required to be smooth and even.
Aiming at the structural member, the traditional method adopts a co-curing process, namely curing of the carbon fiber composite material panel and bonding of the core material of the sandwich structure and the panel are completed at one time, and the method solves the problems that the part outer skin 100 is easy to loose and poor in bonding due to the fact that the part is large in height (namely, the inner cavity of the part is deeper) in the forming process, so that pressure cannot be well transmitted; in addition, the curvature of the part is large, the inner cavity is narrow, and if a female die forming method with a single structure is adopted, the process operation difficulty is high, and the die is not easy to be lifted after the part is formed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a forming method and a die suitable for an irregular U-shaped composite material foam sandwich structural member.
The technical scheme of the invention is as follows:
a molding method suitable for an irregular U-shaped composite material foam sandwich structural member comprises the following steps:
s1, manufacturing a die: manufacturing an outer skin paving mold, an inner skin paving mold and an assembly forming mold;
s2, manufacturing a foam core: adopting numerical control processing to process the PMI foam blank into a foam core according to a part number die;
s3, paving the outer skin on an outer skin paving mold, taking down the paved outer skin and installing the outer skin in an assembly forming mold, and sending the assembly forming mold and the outer skin into an autoclave together for curing and forming to obtain a cured outer skin assembly;
s4, paving the inner skin on the inner skin paving mold and paving the foam core to obtain an uncured inner skin assembly;
s5, assembling the cured outer skin assembly and the uncured inner skin assembly by using an assembly forming die to obtain an assembly forming body;
and S6, sending the assembled forming body into an autoclave for curing and forming to obtain the foam sandwich structural member.
Preferably, S3 specifically comprises the following operations:
1) Paving an outer skin blank on an outer skin die body of an outer skin paving die by using carbon fiber prepreg, and vacuumizing and pre-compacting each time 1-4 layers of prepreg are paved;
2) A positioning hole is formed in the outer skin blank body by utilizing a first drill plate, and then the positioning hole is taken down and put into an assembly forming die;
3) Accurately positioning the outer skin according to the coincidence of the outer skin blank and the positioning hole on the assembly forming die;
4) And paving auxiliary materials on the surface of the outer skin to perform assembly airtight, wherein the vacuum degree is not lower than-0.095 MPa.
Preferably, the outer skin vacuum pre-compaction parameters: vacuum degree is not lower than-0.07 MPa, vacuum pressure is maintained for more than 10-20 min, and curing parameters are as follows: when the temperature is raised to 175-185 ℃, the pressure is 0.60-0.65 MPa, and the temperature and pressure are maintained for 120-135 min.
Preferably, S4 specifically includes the following operations:
1) Paving an inner skin blank on the inner skin die body by using carbon fiber prepreg, and vacuumizing and pre-compacting each time 1-4 layers of prepreg are paved;
2) Forming a positioning hole in the inner skin blank by using a second drill plate;
3) Paving a high-temperature adhesive film on the surface of the inner skin blank, paving a foam core according to the sinking position shown on the surface of the inner skin blank so as to ensure the accuracy of the position of the foam core in the part manufacturing process, paving a high-temperature adhesive film on the other surface of the foam core, and heating the adhesive film properly by an electric iron in the adhesive film paving process, so that the foam core is initially positioned by utilizing the viscosity of the adhesive film;
4) The laying of the foam core is completed by vacuum-pumping precompaction.
Preferably, the inner skin vacuuming precompaction parameters: the vacuum degree is not lower than-0.07 MPa, and the vacuum pressure is maintained for more than 10-20 min.
Preferably, in S5, auxiliary materials are paved on the surface of the inner skin to carry out assembly airtight, and the vacuum degree is not lower than-0.095 MPa.
Preferably, the curing parameters in S6: when the temperature is raised to 175-185 ℃, the pressure is 0.60-0.65 MPa, and the temperature and pressure are maintained for 120-135 min.
A forming die for an irregular U-shaped composite material foam sandwich structural member comprises an outer skin paving die, an inner skin paving die and an assembly forming die,
the outer skin paving die comprises an outer skin die body, a first drill plate and a first bottom plate, wherein the outer surface size of the outer skin die body is determined according to the size of the inner surface of the outer skin, the outer skin die body is welded with the first bottom plate, and the first drill plate is arranged on the outer skin die body;
the inner skin paving die comprises an inner skin die body, a second drill plate and a second bottom plate, the outer surface size of the inner skin die body is determined according to the size of the outer surface of the inner skin, the inner skin die body is welded with the second bottom plate, and the second drill plate is arranged on the inner skin die body;
the assembly forming die comprises a forming die body and a third drill plate, wherein the forming die body comprises a left half die body and a right half die body, the left half die body is provided with the third drill plate, and the left half die body is detachably provided with the right half die body through angle steel.
Preferably, the width of the left half mould body is larger than that of the right half mould body, the length of the left half mould body is larger than that of the right half mould body, and an opening is arranged between the two ends of the left half mould body and the two ends of the right half mould body.
Preferably, the width of the butt joint surface of the left half mould body and the right half mould body in the vertical direction of the working profile area is at least 50mm, the clearance of the butt joint surface is 0.3mm, and angle steel is respectively arranged at the two ends and in the length direction of the left half mould body; the inner side surface of the angle steel is provided with a gap of 0.5mm with the right half die body, and the angle steel is connected with the left half die body by a bolt; the positioning holes of the first drill plate, the second drill plate and the third drill plate coincide.
The invention adopts a co-cementing process to mold, the outer skin is cured and molded in advance, then the outer skin is assembled with the uncured inner skin and the foam core and then cured and molded, and three sets of molds are needed to be customized to be matched for use to mold the structural member according to the structural characteristics of the part and the operability of the manufacturing process, wherein two sets of molds are male molds, and the main function is to lay the inner skin and the outer skin of the part; the female mold is mainly used for forming the outer skin and assembling and bonding the inner skin, the outer skin and the inner foam core, the three molds are all provided with positioning devices capable of forming holes by adopting the same standard, the accuracy in the assembling process of the inner skin and the outer skin is ensured, the operation difficulty of the parts in the manufacturing process can be effectively reduced by adopting a co-bonding process and a forming mold used in a matched manner, the bonding internal quality of the parts, the accuracy and the surface quality of the foam core position can be ensured, and the qualification rate and the production efficiency of the parts can be improved.
Drawings
FIG. 1 is a schematic illustration of the structure of an irregular U-shaped foam sandwich structure;
FIG. 2 is a schematic view of the structure of an outer skin laying mold according to the preferred embodiment of the present invention;
FIG. 3 is a schematic view showing the structure of an inner skin laying mold according to a preferred embodiment of the present invention;
FIG. 4 is a schematic view of an assembly mold according to a preferred embodiment of the present invention;
FIG. 5 is a cross-sectional view of an assembled mold in accordance with a preferred embodiment of the present invention;
in the figure: the outer skin paving die 1, the inner skin paving die 2, the assembly forming die 3, the outer skin die body 11, the first drill plate 12, the first bottom plate 13, the inner skin die body 21, the second drill plate 22, the second bottom plate 23, the left half die body 31, the right half die body 32, the angle steel 33, the third drill plate 34, the bolt 35, the yielding opening 36, the outer skin 100, the inner skin 200 and the foam core 300.
Detailed Description
The present invention will be further described by way of the following examples, however, the scope of the present invention is not limited to the following examples.
Example 1: the forming die for the irregular U-shaped composite material foam sandwich structural member shown in the figure 2-4 comprises an outer skin paving die 1, an inner skin paving die 2 and an assembling forming die 3,
the method comprises the steps that an outer skin paving die 1 is selected, steel materials with proper specifications are selected, the molded surface of an outer skin die body 11 is milled according to the reduction of 0.2mm of the inner surface of an outer skin 100 of a foam sandwich structural member, the outer skin die body 11 is welded and connected with a first bottom plate 13, a first drill jig plate 12 is arranged at the diagonal position of the outer skin die body 11 outside the edge line of a part, and the drill jig plate is used for manufacturing a positioning hole;
the inner skin paving die 2 is used for selecting steel materials with proper specifications, milling the molded surface of the inner skin die body 21 according to the reduction of 0.2mm of the outer surface of the inner skin 200 of the foam sandwich structural member, welding the inner skin die body 21 with the second bottom plate 23, arranging a second drilling template 22 at the opposite angle of the inner skin die body 21 outside the edge line of the part, and making a positioning hole and keeping the same standard with the positioning hole positioned by the first drilling template 12;
selecting steel with proper specification, milling the molded surface of a molding die body according to the outer surface of the outer skin 100 of the foam sandwich structural member, wherein the molding die body is divided into a left half die body 31 and a right half die body 32, and the two parts are as follows: the width of the joining surface of the left half mould body 31 and the right half mould body 32 in the vertical direction of the working surface area is at least 50mm, and the opening 36 is arranged between the two ends of the joining surface of the two mould bodies, so that the problem that the left half mould body 31 and the right half mould body 32 cannot be accurately joined due to glue accumulation after the long-term use of the mould can be effectively avoided. The clearance between the joint surfaces in the other vertical directions is 0.3mm, wherein the left half die body 31 is required to be provided with a limit L-shaped angle steel 33 on the right half die body 32, the problem of matching caused by inaccurate die processing can be effectively solved, at least three positions are arranged in the length direction, at least one position is respectively arranged at two ends, one side of the angle steel 33 is provided with a clearance of 0.5mm with the right half die body 32, and the angle steel 33 is connected with the left half die body 31 by adopting a bolt 35; a third drill plate 34 is arranged at the opposite angle of the mould outside the edge line of the part, is used for manufacturing a positioning hole, keeps the same standard with the positioning holes formed by the first drill plate 12 and the second drill plate 22, and is used for assembling and positioning the inner skin and the outer skin in the foam sandwich structural member assembling and forming mould 3.
A molding method suitable for an irregular U-shaped composite material foam sandwich structural member comprises the following specific operation steps:
s1, manufacturing a die: manufacturing an outer skin paving mould 1, an inner skin paving mould 2 and an assembly forming mould 3;
s2, adopting a numerical control processing method to process the PMI foam blank into a foam core 300 for standby according to a part number die, wherein the foam core 300 can be divided into two blocks at most;
s3, paving an outer skin blank on an outer skin die body 11 by using carbon fiber prepreg, vacuumizing and pre-compacting 1-4 layers of prepreg, opening a positioning hole on the blank by using a first drilling template 12, taking down the blank, placing the blank into an assembly forming die 3, accurately positioning an outer skin 100 according to the coincidence of the outer skin blank and the positioning hole on the assembly forming die 3, paving auxiliary materials on the surface of the outer skin 100 for assembly airtight, ensuring that the vacuum degree is not lower than-0.095 MPa, and finally conveying the die into an autoclave for curing and forming to obtain a cured outer skin assembly, wherein the vacuumizing and pre-compacting parameters are as follows: vacuum degree is not lower than-0.07 MPa, vacuum pressure is maintained for more than 10-20 min, and curing parameters are as follows: heating to 175-185 deg.c, maintaining the pressure of 0.60-0.65 MPa for 120-135 min;
s4, paving an inner skin blank on the inner skin die body 21 by using carbon fiber prepreg, vacuumizing and pre-compacting 1-4 layers of prepreg, forming positioning holes, paving a high-temperature adhesive film on the surface of the blank, paving a foam core 300 according to a sinking position shown on the surface of the inner skin blank to ensure the accuracy of the position of the foam core 300 in the part manufacturing process, paving a high-temperature adhesive film on the other surface of the foam core 300, heating the adhesive film appropriately by an electric iron in the adhesive film paving process, positioning the foam core 300 in a primary step by using the viscosity of the adhesive film, and finally completing the assembly of the inner skin 200 and the foam core 300 by vacuumizing and pre-compacting to obtain an uncured inner skin assembly, wherein the vacuumizing and pre-compacting parameters are as follows: the vacuum degree is not lower than-0.07 MPa, and the vacuum pressure is maintained for more than 10-20 min;
s5, placing the uncured inner skin assembly into an assembly forming die 3, accurately positioning the inner skin 200 and the foam core according to the coincidence of the blank and a positioning hole on the assembly forming die 3, assembling the inner skin and the foam core with the cured outer skin 100 to obtain an assembly forming body, paving auxiliary materials on the surface of the inner skin 200 for assembly airtight, and ensuring that the vacuum degree is not lower than-0.095 MPa;
s6, finally, sending the die into an autoclave for cementing, curing and forming, wherein the curing parameters are as follows: when the temperature is raised to 175-185 ℃, the pressure is 0.60-0.65 MPa, and the temperature and pressure are maintained for 120-135 min, so as to obtain the foam sandwich structural member. In order to improve the internal bonding quality of the bonding area of the inner skin and the outer skin of the part and the surface quality of the inner skin 200, a equalizing plate made of rubber and glass fiber reinforced plastic can be placed outside auxiliary materials on the surface of the bonding area of the periphery of the assembled inner skin blank.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. The forming method suitable for the irregular U-shaped composite material foam sandwich structural member is characterized by comprising the following steps of:
s1, manufacturing a die: manufacturing an outer skin paving mold, an inner skin paving mold and an assembly forming mold, wherein the outer skin paving mold and the inner skin paving mold are male molds, and the assembly forming mold is a female mold;
s2, manufacturing a foam core: adopting numerical control processing to process the PMI foam blank into a foam core according to a part number die;
s3, paving the outer skin on an outer skin paving mold, taking down the paved outer skin and installing the outer skin in an assembly forming mold, and sending the assembly forming mold and the outer skin into an autoclave together for curing and forming to obtain a cured outer skin assembly;
s4, paving the inner skin on the inner skin paving mold and paving the foam core to obtain an uncured inner skin assembly;
s5, assembling the cured outer skin assembly and the uncured inner skin assembly by using an assembly forming die to obtain an assembly forming body;
and S6, sending the assembled forming body into an autoclave for curing and forming to obtain the foam sandwich structural member.
2. The method for forming a foam sandwich structure of an irregular U-shaped composite material according to claim 1, wherein S3 comprises the following operations:
1) Paving an outer skin blank on an outer skin die body of an outer skin paving die by using carbon fiber prepreg, and vacuumizing and pre-compacting each time 1-4 layers of prepreg are paved;
2) A positioning hole is formed in the outer skin blank body by utilizing a first drill plate, and then the positioning hole is taken down and put into an assembly forming die;
3) Accurately positioning the outer skin according to the coincidence of the outer skin blank and the positioning hole on the assembly forming die;
4) And paving auxiliary materials on the surface of the outer skin to perform assembly airtight, wherein the vacuum degree is not lower than-0.095 MPa.
3. A method of forming a foam sandwich structure of an irregular U-shaped composite material according to claim 2, characterized by the outer skin vacuum pre-compaction parameters: vacuum degree is not lower than-0.07 MPa, vacuum pressure is maintained for more than 10-20 min, and curing parameters are as follows: when the temperature is raised to 175-185 ℃, the pressure is 0.60-0.65 MPa, and the temperature and pressure are maintained for 120-135 min.
4. The method for forming a foam sandwich structure of an irregular U-shaped composite material according to claim 1, wherein S4 comprises the following operations:
1) Paving an inner skin blank on the inner skin die body by using carbon fiber prepreg, and vacuumizing and pre-compacting each time 1-4 layers of prepreg are paved;
2) Forming a positioning hole in the inner skin blank by using a second drill plate;
3) Paving a high-temperature adhesive film on the surface of the inner skin blank, paving a foam core according to the sinking position shown on the surface of the inner skin blank so as to ensure the accuracy of the position of the foam core in the part manufacturing process, paving a high-temperature adhesive film on the other surface of the foam core, and heating the adhesive film properly by an electric iron in the adhesive film paving process, and primarily positioning the foam core by utilizing the viscosity of the adhesive film;
4) The laying of the foam core is completed by vacuum-pumping precompaction.
5. The method for forming a foam sandwich structure of an irregular U-shaped composite material of claim 4 wherein the internal skin vacuuming precompaction parameters: the vacuum degree is not lower than-0.07 MPa, and the vacuum pressure is maintained for more than 10-20 min.
6. The method for forming a foam sandwich structure made of irregular U-shaped composite material according to claim 1, wherein in S5, auxiliary materials are paved on the surface of the inner skin for assembly and airtight, and the vacuum degree is not lower than-0.095 MPa.
7. A method of forming a foam sandwich structure for irregular U-shaped composite materials according to claim 1 wherein the curing parameters in S6: when the temperature is raised to 175-185 ℃, the pressure is 0.60-0.65 MPa, and the temperature and pressure are maintained for 120-135 min.
8. A forming die for an irregular U-shaped composite material foam sandwich structural member, which is used in a forming method for the irregular U-shaped composite material foam sandwich structural member according to any one of claims 1 to 7 and is characterized by comprising an outer skin paving die, an inner skin paving die and an assembling forming die,
the outer skin paving die comprises an outer skin die body, a first drill plate and a first bottom plate, wherein the outer surface size of the outer skin die body is determined according to the size of the inner surface of the outer skin, the outer skin die body is welded with the first bottom plate, and the first drill plate is arranged on the outer skin die body;
the inner skin paving die comprises an inner skin die body, a second drill plate and a second bottom plate, the outer surface size of the inner skin die body is determined according to the size of the outer surface of the inner skin, the inner skin die body is welded with the second bottom plate, and the second drill plate is arranged on the inner skin die body;
the assembly forming die comprises a forming die body and a third drill plate, wherein the forming die body comprises a left half die body and a right half die body, the left half die body is provided with the third drill plate, and the left half die body is detachably provided with the right half die body through angle steel.
9. The molding die for the irregular U-shaped composite material foam sandwich structural member according to claim 8, wherein the width of the left half die body is larger than that of the right half die body, the length of the left half die body is larger than that of the right half die body, and a yielding opening is arranged between two ends of the left half die body and two ends of the mating surface of the right half die body.
10. The molding die for the irregular U-shaped composite material foam sandwich structural member according to claim 8 or 9, wherein the width of the butt joint surface of the left half die body and the right half die body in the vertical direction of the working profile area is at least 50mm, the clearance of the butt joint surface is 0.3mm, and angle steel is respectively arranged at the two ends and in the length direction of the left half die body; the inner side surface of the angle steel is provided with a gap of 0.5mm with the right half die body, and the angle steel is connected with the left half die body by a bolt; the positioning holes of the first drill plate, the second drill plate and the third drill plate coincide.
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| CN202111546556.7A CN114179396B (en) | 2021-12-17 | 2021-12-17 | Forming method and die suitable for irregular U-shaped composite material foam sandwich structural member |
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