CN108995250B - RTM forming die of composite material part with segmented rotary structure - Google Patents
RTM forming die of composite material part with segmented rotary structure Download PDFInfo
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- CN108995250B CN108995250B CN201810641699.8A CN201810641699A CN108995250B CN 108995250 B CN108995250 B CN 108995250B CN 201810641699 A CN201810641699 A CN 201810641699A CN 108995250 B CN108995250 B CN 108995250B
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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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
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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
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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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
- B29L2031/3076—Aircrafts
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- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of resin matrix composite material forming, and relates to an RTM forming die for composite material parts with segmented rotary structures. The mold comprises an upper mold, a lower mold, an intermediate section combined inner core mold, an upper intermediate section inner core mold, an outer forming mold and a movable sliding block. When the die is closed, the middle partition combined type inner core die is placed in the positioning groove of the lower die, the upper partition combined type inner core die is placed on the middle partition combined type inner core die, the outer forming die is placed on the bottom surface of the lower die, the movable sliding block is placed on the periphery of the outer forming die, the upper die and the lower die are closed, the die closing gap between the upper die and the lower die is gradually reduced under the fastening action of the bolts, and meanwhile, the movable sliding block moves in a plane under the action of the lateral inner molded surfaces of the upper die and the lower die and places the outer forming die at a theoretical position. The design of the combined steel inner core mold can ensure that the core mold is separated from the semi-closed partition inner cavity, and simultaneously ensure the size precision of the inner molded surface and the flange of the rotary structure.
Description
Technical Field
The invention belongs to the technical field of resin matrix composite material forming, and relates to an RTM (resin transfer molding) forming die for composite material parts with segmented rotary structures.
Background
The advanced resin-based composite material has the unique advantages of higher specific strength and specific stiffness, strong designability, excellent corrosion resistance and convenience for large-area integral forming, and becomes an indispensable strategic material in the aerospace craft structure. The application of the composite material to the aeronautical weapon equipment in a large quantity can effectively improve the performance, reduce the structural weight, reduce the operation cost and enhance the market competitiveness. Advanced composite materials are increasingly used in aircraft construction. On one hand, the proportion of the using amount of the composite material is continuously improved in military aircraft, and on the other hand, the application part of the advanced composite material is developed from the past secondary bearing structure to the main bearing structure; the Molding process is transformed from a high cost autoclave Molding process to a low cost Resin Transfer Molding (RTM) bulk Molding technique.
The RTM process has the process characteristic of closed mold forming, the inner surface and the outer surface of a workpiece are controlled by the mold surface, so that the overall dimension precision of the workpiece is high, the integral manufacture of the workpiece with a complex structure can be realized through reasonable layering optimization and the design of a forming mold, the structural weight reduction efficiency is effectively improved, and the manufacturing and assembling cost of the composite material workpiece is reduced. The partition type rotary composite material structure is a typical main bearing structure in the aerospace field, and the rotary structure can be reinforced by adopting the annular flange as a partition, so that the strength and the rigidity of the whole structure are improved. In addition, the circumferential flange can be used as a mounting platform for internal equipment, and the flange is required to have high flatness and surface finish. Based on the requirements, the segmented rotary composite material structure is preferably manufactured integrally by adopting an RTM (resin transfer molding) process.
The RTM forming process is adopted to prepare the composite material part with the partition section type rotary structure, and when a forming die is designed, a key design factor exists, namely how the inner core die of the partition section is separated after the composite material part is formed and cured. For the problem of how to release the core mold in the semi-closed composite material structure, the traditional solution includes: 1) an air bag is used as the inner core mold, 2) expanded rubber is used as the inner core mold, 3) a wax mold is used as the inner core mold, and 4) insoluble ceramic is used as the inner core mold. The above solutions are all based on an integrated inner core mold forming scheme, but the inner core mold has poor rigidity and is easy to deform at high temperature and high pressure, and the molded surface of a composite material part cannot be effectively ensured, so that the inner core mold forming method is not suitable for an RTM (resin transfer molding) forming process.
Disclosure of Invention
The invention aims to solve the problem that an inner core mould of a composite material part with a segmented rotary structure is separated: the RTM forming die for the composite material part with the segmented rotary structure is provided to meet the technological requirements of high dimensional precision and integrated manufacturing of the segmented rotary structure.
The technical solution of the invention is as follows:
each group of components of the mould comprises an upper mould, a lower mould, a middle partition combined inner core mould, an upper partition combined inner core mould, an outer forming mould and a movable sliding block,
(a) the upper die is designed as a female die, and the lateral inner molded surface of the upper die is an inclined surface; the bottom molded surface is a plane, and a sealing groove are designed on the bottom plane; manufacturing a character opening positioning groove matched with the lower die on the parting surface of the upper die;
(b) the lower die is designed as a female die, and the lateral inner molded surface of the lower die is an inclined surface; the bottom molded surface is a plane, a boss is designed in the middle of the bottom molded surface according to the molded surface of the inner cavity of the lower partition section of the composite material part, a positioning groove for mounting the lower end of the middle partition section combined type inner core mold is designed on the surface of the boss, and a sealing groove is designed on the surface of the positioning groove; a sealing groove is designed on the outer side of the boss on the bottom molded surface; manufacturing a character opening positioning table matched with the upper die on the parting surface of the lower die; a sealing groove is formed in the parting surface of the lower die;
(c) the middle partition section combined type inner core mold comprises a U-shaped core mold and a C-shaped forming mold, and an inner cavity of the U-shaped core mold is provided with an operation space for assembling and disassembling bolts; the shape of the C-shaped forming die is consistent with the inner molded surface of the partition section in the composite material part, and the C-shaped forming die is partitioned along the axial direction of the composite material part; the C-shaped forming die after blocking is fixed on the outer surface of the U-shaped core die through bolts; the lower end of the U-shaped core mold is arranged in a boss positioning groove at the bottom of the lower mold; the upper end of the U-shaped core mold is arranged in the positioning groove of the core mold in the upper partition section;
(d) the upper surface of the inner core mould of the upper partition section is designed into a plane and is matched with the bottom profile of the upper mould; the side and bottom molded surfaces of the upper partition section inner core mold are consistent with the upper partition section inner molded surface of the composite material part; a positioning groove for installing the upper end of a U-shaped core mold in the middle partition combined type inner core mold is arranged on the molded surface of the bottom of the upper partition inner core mold, and a sealing groove is designed on the surface of the positioning groove;
(e) the outer forming die is designed in a partitioning mode along the axial direction of the composite material product, the inner profile of the outer forming die is consistent with the outer profile of the composite material product, the outer profile of the outer forming die is perpendicular to the bottom profile of the lower die and matched with the inner profile of the corresponding movable sliding block, the outer upper profile of the outer forming die is matched with the bottom plane of the upper die, and the outer lower profile of the outer forming die is matched with the bottom plane of the lower die;
(f) the upper part of the outer side surface of the movable sliding block is consistent with the angle of the lateral inner molded surface of the upper die, and the lower part of the outer side surface of the movable sliding block is consistent with the angle of the lateral inner molded surface of the lower die;
when the die is closed, the middle partition combined type inner core die is placed in the positioning groove of the lower die, the upper partition combined type inner core die is placed on the middle partition combined type inner core die, the outer forming die is placed on the bottom surface of the lower die, the movable sliding block is placed on the periphery of the outer forming die, the upper die and the lower die are closed, the die closing gap between the upper die and the lower die is gradually reduced under the fastening action of the bolts, and meanwhile, the movable sliding block moves in a plane under the action of the lateral inner molded surfaces of the upper die and the lower die and places the outer forming die at a theoretical position.
The components of the die are made of 45# steel, P20 steel or a combination thereof.
The slope of the side inner molded surface of the upper die is 15-20 degrees, the length of the character opening positioning groove is 30-80 mm, the width is 30-80 mm, the depth is 10-30 mm, and the slope is controlled between 5-20 degrees.
The slope of the lateral inner molded surface of the lower die 2 is 15-20 degrees, the depth of the positioning groove is 5-10 mm, the length of the character opening positioning table is 30-80 mm, the width is 30-80 mm, the height is 10-30 mm, and the slope is controlled between 5-20 degrees.
The wall thickness of the U-shaped core mold 3-1 of the middle partition combined type inner core mold is 20 mm-50 mm; the C-shaped forming die is divided into 4 to 16 blocks.
The depth of the positioning groove in the upper partition section inner core mold is 5 mm-10 mm.
The invention has the advantages and beneficial effects that the design idea of the combined inner core mould is adopted, the part which is not covered by the flange is designed into the U-shaped core mould which can be freely separated, then the outer surface of the U-shaped core mould is connected with the C-shaped forming mould which is designed in a partitioning mode through the bolts, when a composite material product with a segmented rotary structure prepared by adopting the core mould is demoulded, the U-shaped core mould can be separated firstly, and then the C-shaped forming mould can be taken out in sequence according to the design sequence along the direction parallel to the flange (namely the axial direction of the composite material product). Meanwhile, based on the requirements of an RTM (resin transfer molding) forming process, a whole set of design ideas of the RTM forming die suitable for the composite material part with the segmented rotary structure are provided.
The design of the combined inner core mold successfully solves the problem of demolding of the inner core mold of the composite material partition structure. The composite material part with the segmented rotary structure prepared by the method has high dimensional precision and excellent inner and outer surface quality, and the flange and the outer skin are integrally formed by one-time curing, so that the manufacturing cost of the composite material is effectively reduced.
Drawings
FIG. 1 is a schematic view of a composite material part with a segmented rotary structure according to the present invention;
FIG. 2 is a schematic diagram of an RTM forming mold for a composite material part with a segmented rotary structure according to the present invention;
FIG. 3 is a schematic view of the upper mold structure of the present invention;
FIG. 4 is a schematic view of the lower mold structure of the present invention;
FIG. 5 is a schematic view of a partition sectional type inner core mold according to the present invention;
FIG. 6 is a schematic view of the upper partition core mold structure of the present invention;
FIG. 7 is a schematic view of the outer mold structure of the present invention;
FIG. 8 is a schematic view of the structure of the movable block of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. Taking the typical structure shown in fig. 1 as an example, the structure is a three-partition rotary structure consisting of an upper flange and a lower flange, wherein 7 is an upper partition, 8 is a middle partition, and 9 is a lower partition. The forming die comprises an upper die 1, a lower die 2, an intermediate section combined inner core die 3 (composed of 3-1 and 3-2), an upper intermediate section inner core die 4, an outer forming die 5 and a movable sliding block 6, and is shown in figure 2.
(a) The upper die 1 is designed as a female die, and as shown in fig. 3, the side inward molded surface of the upper die 1 is an inclined surface which is matched with the upper half part of the movable slider 6 to provide a driving force for the movable slider 6 to slide along the surface; 1-1 is a double-sealing groove for sealing the upper surface of the inner core mold 4 of the upper partition section; 1-2 is a double-sealing groove for sealing the upper surface of the outer forming die 5; when the upper die and the lower die are combined, the character opening positioning grooves 1-3 can play a role in accurate positioning;
(b) the lower die 2 is designed as a female die, and as shown in fig. 4, the inward profile of the lower die 2 is an inclined surface which is matched with the lower half part of the movable sliding block 6 to provide a driving force for the sliding of the movable sliding block 6 along the surface; a boss 2-1 is manufactured on the bottom surface of the lower die 2 according to the inner molded surface of the lower partition of a workpiece, a positioning groove 2-2 for positioning a middle partition combined inner core die 3-1 is manufactured on the surface of the boss 2-1, and two sealing grooves 2-3 are manufactured; two sealing grooves 2-4 for sealing the lower surface of the outer forming die 5 are formed on the bottom surface of the lower die 2; two sealing grooves are arranged on the parting surface of the lower die 2 and are used for sealing the upper die and the lower die; a character opening positioning table 2-1 which can be matched with the character opening positioning groove 1-1 is arranged on the parting surface of the lower die 2;
(c) the middle partition combined inner core mold 3 comprises a U-shaped core mold 3-1 and a C-shaped forming mold 3-2, as shown in fig. 5, the inner cavity of the U-shaped core mold 3-1 is provided with an operation space for a detachable bolt, and the middle partition combined inner core mold is mainly used for assembling and disassembling the middle partition combined inner core mold; the C-shaped forming die 3-2 needs to be partitioned along the direction vertical to the flange, and the purpose of partitioning is that the C-shaped forming die 3-2 can be gradually moved out of the closed cavity under the action of external force along the direction of the flange according to the design sequence during demoulding;
(d) the side and bottom molded surfaces of the upper partition inner core mold 4 are consistent with the upper partition inner molded surface of the composite material part; the molded surface of the bottom of the upper partition section inner core mold 4 is provided with an upper end positioning groove 4-1 of the partition section combined inner core mold 3, and meanwhile, a sealing groove 4-2 is designed on the surface of the positioning groove, as shown in fig. 6;
(e) the outer forming die 5 is composed of four blocks, as shown in fig. 7, the inner molded surface of the outer forming die is consistent with the outer molded surface of the composite material part, and the outer molded surface of the outer forming die 5 is vertical to the bottom molded surface of the lower die 2 and is matched with the inner molded surface of the corresponding movable sliding block 6;
(f) the movable sliding block 6 is composed of four blocks, as shown in fig. 8, the angle of the upper part of the outer side surface of the movable sliding block 6 is consistent with the angle of the side inward molded surface of the upper die 1, and the angle of the lower part of the outer side surface of the movable sliding block 6 is consistent with the angle of the side inward molded surface of the lower die 2;
the preparation process of the composite material part with the segmented rotating structure comprises the following steps:
(1) paving dry-state pre-shaping fabric on a boss 2-1 of the lower die 2 according to the designed paving layer, and performing vacuum pre-shaping on the flange prefabricated body after paving;
(2) connecting a U-shaped core mold 3-1 and a C-shaped forming mold 3-2 into a middle partition combined type inner core mold 3 through bolts, paving a C-shaped prefabricated body on the outer part of the C-shaped forming mold 3-2 according to a designed layer, and performing vacuum presetting on the prefabricated body;
(3) placing the middle partition combined type inner core mold 3 in a positioning groove 2-2 of the lower mold 2, and performing vacuum pre-setting on the lower mold 2 and the middle partition combined type inner core mold 3 to enable the middle partition combined type inner core mold 3 to be accurately positioned in the positioning groove;
(4) laying a C-shaped dry-state pre-shaping fabric on the upper partition inner core mold 4 according to the design, performing vacuum pre-shaping, then combining the positioning groove 4-1 of the upper partition inner core mold 4 with the upper end surface of the middle partition combined inner core mold 3-1, and performing vacuum pre-shaping;
(5) unidirectional fiber filling is carried out on a triangular area formed by the involution of the upper partition section and the middle partition section and the involution of the middle partition section and the boss 2-1 of the lower die 2, and vacuum presetting is carried out;
(6) paving and covering the workpiece skin according to the designed paving layer on the periphery of the upper partition inner core mold 4, the middle partition combined inner core mold 3 and the boss 2-1 combined body, and performing vacuum presetting;
(7) placing an outer forming die 5 into a lower die 2, placing a movable sliding block 6 on the outer side of the outer forming die 5, matching an upper die 1 with the lower die 2, gradually reducing the die closing gap between the upper die 1 and the lower die 2 under the action of bolt fastening, and simultaneously moving the movable sliding block 6 in a plane under the action of the side inner molded surfaces of the upper die and the lower die and placing the outer forming die 5 at a theoretical position;
(8) by adopting an RTM (resin transfer molding) process, injecting low-viscosity liquid molding resin into a mold, enabling the resin to flow and soak dry fiber pre-molded fabric, and curing the composite material under the action of heat;
(9) when the composite material product with the segmental rotary structure is demoulded, connecting bolts of the upper die and the lower die are removed, the upper die 1 is moved away, the inner core die 4 of the upper segmental is pulled out, bolts for connecting the U-shaped core die 3-1 with the C-shaped forming die 3-2 are removed, the U-shaped core die 3-1 is taken out, the C-shaped forming die 3-2 of the block is taken out along the flange direction of the product, the movable sliding block 6 and the outer forming die 5 are taken out, the product is pulled out from the boss 2-1, and the demoulding of the composite material product with the segmental rotary structure is completed.
Detailed description of the preferred embodiment
The typical structure is shown in fig. 1, and the three-partition type rotary structure consists of an upper flange and a lower flange, and has the following external dimensions: the height is 200mm, the diameter of the large end is 400mm, the diameter of the small end is 300mm, the fabric is prepared by adopting dry-state pre-forming fabric, then low-viscosity resin is injected through an RTM (resin transfer molding) process, and finally, the fabric is cured and formed. We have adopted the solution of the present invention, and all the components of the die are made of P20 steel.
The upper die 1 is designed as a female die, and the slope of the lateral inner molded surface of the upper die 1 is 15 degrees; the molded surface of the bottom is a plane, and the width of the sealing grooves 1-1 and 1-2 designed on the plane of the bottom is 4.5mm, and the depth is 5.5 mm; the length of the letter-opening positioning table 1-3 is 40mm, the width is 50mm, the height is 10mm, and the inclination is 10 degrees;
the lower die 2 is designed as a female die, and the inclination of the side inner molded surface of the lower die 2 is 15 degrees; the bottom molded surface is a plane, a boss 2-1 is designed at the middle position of the bottom molded surface according to the molded surface of the inner cavity of the lower partition section of the composite material part, and the depth of the positioning groove 2-2 is 10 mm; the length of the character opening positioning grooves 2-6 is 40mm, the width is 50mm, the height is 10mm, and the inclination is 10 degrees; the width of the sealing grooves 2-3, 2-4 and 2-5 is 4.5mm, and the depth is 5.5 mm;
the middle partition section combined type inner core mold 3 comprises a U-shaped core mold 3-1 and a C-shaped forming mold 3-2, the diameter of the inner cavity of the U-shaped core mold 3-1 is 180mm, and the wall thickness is 40 mm; the C-shaped forming die 3-2 is divided into 8 blocks;
the diameter of the inner core mould 4 is 294mm, the height is 30mm, the depth of the positioning groove 4-1 is 10mm, the width of the sealing groove is 4.5mm, and the depth is 5.5 mm;
the movable sliding blocks 6 are respectively arranged on the outer sides of the outer forming dies 5; the angle of the inclined plane at the upper part of the outer side of the movable sliding block 6 is 15 degrees, and the angle of the inclined plane at the lower part of the outer side of the movable sliding block 6 is 15 degrees;
when the die is closed, the middle partition combined type inner core die 3 is placed in the positioning groove 2-2 of the lower die 2, the upper partition combined type inner core die 4 is placed on the middle partition combined type inner core die 3, the outer forming die 5 is placed on the bottom surface of the lower die 2, the movable sliding block is placed on the periphery of the outer forming die 5, the upper die 1 and the lower die 2 are combined, under the fastening action of the bolts, the die closing gap between the upper die 1 and the lower die 2 is gradually reduced, and meanwhile, the movable sliding block 6 moves in a plane under the action of the lateral inner molded surfaces of the upper die and the lower die and places the outer forming die 5 at a theoretical position.
Claims (6)
1. The utility model provides a RTM forming die of segmentation revolution mechanic combined material finished piece, mould each group of component includes mould (1), lower mould (2), well segmentation combination formula inner core mould (3), goes up mandrel (4) in the segmentation, outer forming die (5) and removes slider (6), its characterized in that:
(a) the upper die (1) is designed as a female die, and the lateral inner molded surface of the upper die (1) is an inclined surface; the bottom molded surface is a plane, and a sealing groove (1-1) and a sealing groove (1-2) are designed on the bottom plane; manufacturing a character opening positioning groove (1-3) matched with the lower die (2) on the parting surface of the upper die (1);
(b) the lower die (2) is designed as a female die, and the lateral inward molded surface of the lower die (2) is an inclined surface; the bottom molded surface is a plane, a boss (2-1) is designed at the middle position of the bottom molded surface according to the molded surface of the inner cavity of the lower partition section of the composite material part, a positioning groove (2-2) for mounting the lower end of the middle partition section combined inner core mold (3) is designed on the surface of the boss (2-1), and a sealing groove (2-3) is designed on the surface of the positioning groove; a sealing groove (2-4) is designed on the outer side of the boss on the bottom profile; manufacturing a character opening positioning table (2-5) matched with the upper die (1) on the parting surface of the lower die (2); a sealing groove (2-6) is arranged on the parting surface of the lower die (2);
(c) the middle partition section combined type inner core mold (3) comprises a U-shaped core mold (3-1) and a C-shaped forming mold (3-2), and an inner cavity of the U-shaped core mold (3-1) is provided with an operation space for a detachable bolt; the shape of the C-shaped forming die (3-2) is consistent with the inner profile of the partition section in the composite material part, and the C-shaped forming die (3-2) is partitioned along the axial direction of the composite material part; the C-shaped forming die (3-2) after being blocked is fixed on the outer surface of the U-shaped core die (3-1) through bolts; the lower end of the U-shaped core mold (3-1) is arranged in a boss positioning groove (2-2) at the bottom of the lower mold (2); the upper end of the U-shaped core mold (3-1) is arranged in a positioning groove (4-1) of the core mold (4) in the upper partition section;
(d) the upper surface of the upper partition section inner core mold (4) is designed to be a plane and is matched with the bottom profile of the upper mold (1); the side and bottom molded surfaces of the upper partition section inner core mold (4) are consistent with the upper partition section inner molded surface of the composite material part; a positioning groove (4-1) for installing the upper end of a U-shaped core mold (3-1) in the middle partition combined type inner core mold (3) is arranged on the molded surface of the bottom of the upper partition inner core mold (4), and a sealing groove (4-2) is designed on the surface of the positioning groove;
(e) the outer forming die (5) is designed in a partitioning mode along the axial direction of the composite material part, the inner profile of the outer forming die (5) is consistent with the outer profile of the composite material part, the outer profile of the outer forming die (5) is perpendicular to the bottom profile of the lower die (2) and matched with the inner profile of the corresponding movable sliding block (6), the outer upper profile of the outer forming die (5) is matched with the bottom plane of the upper die (1), and the outer lower profile of the outer forming die (5) is matched with the bottom plane of the lower die (2);
(f) the upper part of the outer side surface of the movable sliding block (6) has the same angle with the side-in molded surface of the upper die (1), and the lower part of the outer side surface of the movable sliding block (6) has the same angle with the side-in molded surface of the lower die (2);
when the die is closed, the middle partition section combined type inner core die (3) is placed in a positioning groove (2-2) of the lower die (2), the upper partition section inner core die (4) is placed on the middle partition section combined type inner core die (3), the outer forming die (5) is placed on the bottom surface of the lower die (2), the movable sliding block is placed on the periphery of the outer forming die (5), the upper die (1) and the lower die (2) are closed, the die closing gap between the upper die (1) and the lower die (2) is gradually reduced under the fastening action of the bolts, and meanwhile, the movable sliding block (6) moves in a plane under the action of the lateral inward molded surfaces of the upper die and the lower die and places the outer forming die (5) at a theoretical position;
the part of the combined inner core mold (3) which is not covered by the flange is set to be a U-shaped core mold (3-1) which can be freely removed, the outer surface of the U-shaped core mold (3-1) is connected with a C-shaped forming mold (3-2) which is designed in a partitioning mode through bolts, the U-shaped core mold (3-1) is removed firstly when the mold is removed, and then the C-shaped forming mold (3-2) is sequentially removed in the direction parallel to the flange according to the design sequence.
2. The RTM forming mold for composite material articles with segmented revolution structure of claim l, wherein: the components of the die are made of 45# steel, P20 steel or a combination thereof.
3. The RTM forming mold for composite material articles with segmented revolution structure of claim l, wherein: the slope of the lateral inner molded surface of the upper die (1) is 15-20 degrees, the length of the I-shaped opening positioning groove (1-3) is 30-80 mm, the width is 30-80 mm, the depth is 10-30 mm, and the slope is controlled to be 5-20 degrees.
4. The RTM forming mold for composite material articles with segmented revolution structure of claim l, wherein: the slope of the side inner molded surface of the lower die (2) is 15-20 degrees, the depth of the positioning groove (2-2) is 5-10 mm, the length of the character opening positioning table (2-5) is 30-80 mm, the width of the character opening positioning table is 30-80 mm, the height of the character opening positioning table is 10-30 mm, and the slope is controlled to be 5-20 degrees.
5. The RTM forming mold for composite material articles with segmented revolution structure of claim l, wherein: the wall thickness of the U-shaped core mold 3-1 of the middle partition combined type inner core mold (3) is 20 mm-50 mm; the C-shaped forming die (3-2) is divided into 4 to 16 blocks.
6. The RTM forming mold for composite material articles with segmented revolution structure of claim l, wherein: the depth of the positioning groove (4-1) in the upper partition section inner core mold (4) is 5 mm-10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810641699.8A CN108995250B (en) | 2018-06-21 | 2018-06-21 | RTM forming die of composite material part with segmented rotary structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810641699.8A CN108995250B (en) | 2018-06-21 | 2018-06-21 | RTM forming die of composite material part with segmented rotary structure |
Publications (2)
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| CN109878001A (en) * | 2019-03-27 | 2019-06-14 | 江苏恒神股份有限公司 | A kind of two chamber of mould molding semi-closed structure answers the RTM mold of material product |
| CN109955503B (en) * | 2019-04-04 | 2020-11-20 | 北京卫星制造厂有限公司 | Return type airship head cover heat-proof layer forming tool |
| CN111673953A (en) * | 2020-06-29 | 2020-09-18 | 南京玻璃纤维研究设计院有限公司 | Double-inverted-flange product conical die and using method thereof |
| CN112339211B (en) * | 2020-11-10 | 2022-12-09 | 湖北三江航天江北机械工程有限公司 | Flexible joint forming method |
| CN112497577B (en) * | 2020-12-18 | 2022-11-25 | 江苏常友环保科技股份有限公司 | Engine room cover inner and outer flange integrated forming combined die |
| CN112873906A (en) * | 2020-12-25 | 2021-06-01 | 中国航空制造技术研究院 | RTM forming die of composite material barrel structure |
| EP4330023A1 (en) * | 2021-04-28 | 2024-03-06 | Safran Aircraft Engines | Device for moulding a bladed part of a turbine engine |
| US20220347945A1 (en) * | 2021-04-28 | 2022-11-03 | Safran Aircraft Engines | Device for moulding a bladed part of a turbomachine |
| CN116423874B (en) * | 2023-06-14 | 2023-09-15 | 北京玻钢院复合材料有限公司 | Blocking die suitable for complex reinforced composite material shell molding |
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| JPS5582615A (en) * | 1978-12-20 | 1980-06-21 | Sekisui Chem Co Ltd | Production of reinforced resin joint |
| DE3885717T2 (en) * | 1987-12-03 | 1994-03-31 | United Technologies Corp | Tool and method for forming complex composite objects. |
| CN105150438B (en) * | 2015-08-19 | 2017-08-22 | 湖北三江航天江北机械工程有限公司 | The wound and solidified device of carbon fibre composite thin-walled skirt type part |
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| CN108068362A (en) * | 2016-11-14 | 2018-05-25 | 昌河飞机工业（集团）有限责任公司 | The forming frock and method of a kind of annular multiple material part in π types section |
| CN106799798A (en) * | 2017-02-13 | 2017-06-06 | 中国船舶重工集团公司第七二五研究所 | A kind of split mould of hyperboloid revolving solid composite material product |
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