CN111070728B - Hot press molding method of fiber reinforced composite material wrinkled sandwich circular truncated cone shell - Google Patents
Hot press molding method of fiber reinforced composite material wrinkled sandwich circular truncated cone shell Download PDFInfo
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- CN111070728B CN111070728B CN201911424751.5A CN201911424751A CN111070728B CN 111070728 B CN111070728 B CN 111070728B CN 201911424751 A CN201911424751 A CN 201911424751A CN 111070728 B CN111070728 B CN 111070728B
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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
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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
- B29C33/3857—Manufacturing moulds, e.g. shaping the mould surface by machining by making impressions of one or more parts of models, e.g. shaped articles and including possible subsequent assembly of the parts
- B29C33/3892—Preparation of the model, e.g. by assembling parts
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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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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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
Abstract
A hot press molding method of a fiber reinforced composite material fold sandwich circular truncated cone shell relates to the field of composite material molding design. The invention solves the problem that no process for preparing the folded sandwich circular truncated cone shell exists at present. The preparation method comprises the following steps of: cleaning and assembling the core die; coating a release agent; cutting, laying, folding and curing the prepreg; demoulding of the folded core; secondly, preparing an inner panel: cleaning the panel mould; coating a release agent; assembling the inner panel mold main body; cutting, laying and curing the prepreg; demolding the inner panel; thirdly, preparing an outer panel: the preparation of the fiber reinforced composite material outer panel is basically the same as the step two; fourthly, assembling, gluing and secondary curing of the folded core and the inner and outer panels: pasting an adhesive film; the folded core is glued with the inner panel and the outer panel; solidifying the folded sandwich circular truncated cone shell; and (5) disassembling the panel mould. The method is used for preparing the fiber reinforced composite material folded sandwich circular truncated cone shell.
Description
Technical Field
The invention relates to the field of composite material molding design, in particular to a hot press molding method of a fiber reinforced composite material folded sandwich circular truncated cone shell.
Background
When the sandwich structure is applied to aerospace structures such as various aircrafts, heavy-load rocket bearing cylinders, fairings, engine shells, interstage sections and the like, the sandwich structure needs to be prepared into a curved surface structure. In addition, since the diameters of some cylindrical shell structures are usually very different, some connecting devices need to be designed, wherein a typical adapting structure is a circular truncated cone shell structure. At present, a circular truncated cone-shaped structure applied to a spacecraft is usually manufactured in a metal circular truncated cone shell structure and a stringer reinforcement mode, and the following defects are inevitably generated: (1) the forming process of the composite material reinforced cylindrical shell mainly adopts a fiber winding method, the preparation process is complex, the forming quality is uncontrollable, and the process cost is high; (2) the closed internal structure tends to accumulate condensation and is not conducive to heat transfer, which can lead to premature structural failure and reduced service life. The folded sandwich circular truncated cone shell has excellent mechanical property, and meanwhile, the open internal channel can effectively avoid the gathering of condensed water and the like. In addition, the pleated core is a three-dimensional structure formed by folding a planar material along a pre-designed fold line, and has the main advantage of ensuring the integrity and the expandability of the material. Effectively avoids the reduction of mechanical properties such as material strength and rigidity caused by cutting the composite material. At present, the folded sandwich structure mainly comprises a flat plate structure and a cylindrical shell structure, the sandwich structure of the circular truncated cone shell is rarely researched, and the folded sandwich circular truncated cone shell structure made of fiber reinforced composite materials is not reported.
Disclosure of Invention
The invention aims to solve the problem that no process for preparing the folded sandwich circular truncated cone shell exists at present, and further provides a hot press molding method of the folded sandwich circular truncated cone shell made of a fiber reinforced composite material.
The technical scheme of the invention is as follows:
the hot press molding method of the fiber reinforced composite material folded sandwich circular truncated cone shell is realized by the following steps:
firstly, preparing a fiber reinforced composite material corrugated core:
step a, cleaning a core die:
cleaning the core mould by using a detergent, and placing the core mould at a ventilation position for airing;
step b, coating a release agent:
uniformly coating the release agent on the surface of a core mold, and then placing the core mold in a ventilation position until the core mold is completely dried;
step c, assembling a core die:
assembling a first male die 1-1 and a second male die 1-2 in a core die into a complete circular truncated cone male die main body, connecting a first core die inner support 1-6 with the upper bottom surfaces of the first male die 1-1 and the second male die 1-2 through a connecting element, and connecting a second core die inner support 1-7 with the lower bottom surfaces of the first male die 1-1 and the second male die 1-2 through a connecting element;
d, cutting and laying of the prepreg:
firstly, calculating the geometric shape of the folded core after the folded core is completely unfolded according to the geometric size; inputting the prepreg into a prepreg cutting machine, cutting out the required prepreg, and laying the prepreg according to the designed laying sequence;
step e, folding the prepreg:
placing the cut prepreg on a heating table for heating, wherein the heating temperature is 30 ℃, after the prepreg is softened, placing the prepreg on the surfaces of a first male die 1-1 and a second male die 1-2, and externally pressing a female die 1-3 into the first male die 1-1 and the second male die 1-2 under the extrusion pressure of 0.5-1Mpa until the fiber prepreg is completely attached to the first male die 1-1 and the second male die 1-2 to obtain a prefabricated folded circular truncated cone shell;
step f, curing the prepreg:
after the twelve female dies 1-3 are completely attached to the first male die 1-1 and the second male die 1-2, installing two core die outer supports 1-5 outside the female dies, connecting the two core die outer supports 1-5 through a connecting element, and after the assembly is finished, putting the circular truncated cone shell-shaped folded prepreg obtained in the step e and the core die into an oven for curing at the curing temperature of 100-200 ℃ for 1-3 hours;
step g, demoulding of the folded core:
firstly, detaching two core mould outer supports 1-5 from the outside, then detaching a first core mould inner support 1-6 and a second core mould inner support 1-7 at the top and the bottom, then slowly taking out a second male mould 1-2, and then removing the first male mould 1-1 to obtain a whole block of cone-shaped folded core, thus finishing the preparation of the folded core of the folded sandwich cone shell;
secondly, preparing the fiber reinforced composite material inner panel:
step h, cleaning the panel die:
cleaning the panel mould by using a detergent, and placing the panel mould at a ventilation position for airing;
step i, coating a release agent:
uniformly coating a release agent on the surface of a panel mould, and then placing the panel mould at a ventilation position until the panel mould is completely dried;
step j, assembling the inner panel mold main body:
buckling a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3 in an inner panel mould main body together to form a hollow truncated cone shell structure, connecting a first panel mould inner support 2-8 with the upper bottom surface of the inner panel mould main body through a connecting element, connecting a second panel mould inner support 2-9 with the lower bottom surface of the inner panel mould main body through a connecting element, and fixing the positions of the first inner panel mould 2-1, the second inner panel mould 2-2 and the third inner panel mould 2-3;
step k, cutting and laying of the prepreg:
firstly, calculating the fan-shaped geometric dimension of a unfolded panel according to the geometric dimension, inputting the fan-shaped geometric dimension into a prepreg cutting machine, cutting out required prepreg, and laying the prepreg according to the designed laying sequence;
step l, laying of prepreg:
laying the cut prepreg on a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3, externally mounting a first middle panel mould 2-4, a second middle panel mould 2-5 and a third middle panel mould 2-6 in a middle panel mould main body, mounting two panel mould outer supports 2-7 outside the middle panel mould main body, buckling the two panel mould outer supports 2-7 left and right, connecting the two panel mould outer supports together through a connecting element, and connecting the lower bottom surfaces of the two panel mould outer supports 2-7 with a second panel mould inner support 2-9 through the connecting element;
step m, curing the prepreg:
putting the assembled panel mould into an oven for curing at 100-200 ℃ for 1-3 hours,
step n, demolding of the inner panel:
firstly, disassembling two panel mould outer supports 2-7, a first middle panel mould 2-4, a second middle panel mould 2-5 and a third middle panel mould 2-6, then disassembling a first panel mould inner support 2-8 and a second panel mould inner support 2-9, and then disassembling a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3 from the inside to obtain a whole block of frustum-shaped inner panel, thus finishing the preparation of the inner panel of the folded frustum shell;
thirdly, preparing the fiber reinforced composite material outer panel:
the preparation of the fiber reinforced composite outer panel is basically the same as the second step, but the difference is that,
in the step l: firstly, a first middle panel mould 2-4, a second middle panel mould 2-5 and a third middle panel mould 2-6 are arranged outside a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3, and then cut prepreg is laid on the first middle panel mould 2-4, the second middle panel mould 2-5 and the third middle panel mould 2-6;
in the step n: firstly, detaching the outer supports 2-7 of the two panel moulds, then detaching the inner supports 2-8 of the first panel mould and the inner supports 2-9 of the second panel mould, detaching the first inner panel mould 2-1, the second inner panel mould 2-2 and the third inner panel mould 2-3 from the inside, finally detaching the first middle panel mould 2-4, the second middle panel mould 2-5 and the third middle panel mould 2-6 from the inside, and finally completing the preparation of the outer panel of the folded sandwich circular truncated cone shell;
fourthly, assembling, gluing and secondary curing of the folded core of the fiber reinforced folded sandwich circular truncated cone shell and the inner and outer panels:
step o, pasting of an adhesive film:
pasting a layer of glue film on the inner surface of the outer panel and the outer surface of the inner panel:
step p, gluing the folded core with the inner panel and the outer panel:
bonding the folded core prepared in the first step with the interior of the outer panel prepared in the third step, then bonding the exterior of the inner panel prepared in the second step with the folded core to obtain a folded sandwich circular truncated cone shell, placing the bonded folded sandwich circular truncated cone shell on the outer surfaces of a first inner panel die 2-1, a second inner panel die 2-2 and a third inner panel die 2-3, installing a first panel die inner support 2-8 on the upper bottom surface of the folded sandwich circular truncated cone shell, installing a second panel die inner support 2-9 on the lower bottom surface of the folded sandwich circular truncated cone shell, and finally installing two panel die outer supports 2-7 on the outer surface of the folded sandwich circular truncated cone shell, wherein the two panel die outer supports 2-7 are connected together through a connecting element to fix the positions of the two panel die outer supports;
step q, curing the folded sandwich circular truncated cone shell:
putting the combined panel mould into an oven, wherein the curing temperature is 100-200 ℃, and the curing time is 1-3 hours;
step r, disassembling the panel mould:
firstly, detaching two panel mould outer supports 2-7, then detaching a first panel mould inner support 2-8 and a second panel mould inner support 2-9, and detaching a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3 from the inside to obtain the folded sandwich circular truncated cone shell, so that the preparation of the folded sandwich circular truncated cone shell is completed.
Compared with the prior art, the invention has the following effects:
1. compared with other preparation processes (such as metal conical shells and stringer reinforcements), the hot press molding method of the fiber reinforced composite material corrugated sandwich circular truncated cone shell has the advantages of simple mold design, simple molding process, high precision and controllable quality. The production efficiency of the product can be greatly improved, and the production cost is reduced.
2. In order to fully utilize the mechanical property of the fiber composite material, the cutting of the prepreg of the composite material is reduced as much as possible. The invention adopts an integral forming method, namely, the whole truncated cone-shaped folded core structure and the inner and outer panel structures are respectively prepared at one time. The overall preparation method reduces the cutting of the prepreg of the composite material, avoids the reduction of the mechanical property of the composite material caused by splicing the composite material, and greatly improves the mechanical property of the structure. Meanwhile, the preparation time and cost of the product can be saved.
3. Compared with a corrugated sandwich circular truncated cone shell structure, the fold line performance of the corrugated sandwich circular truncated cone shell can increase the contact area between the core and the inner and outer panels, so that the restraint of the corrugated core on the inner and outer panels is higher than that of the sandwich circular truncated cone shell structure. Under the action of bending load, the corrugated panel can be better resisted.
4. The inherent performance of the folds enables the fold sandwich circular truncated cone shell to be provided with an open channel along the direction of the circular truncated cone generatrix, so that fluid and heat can flow out of the fold sandwich circular truncated cone shell through the channel, the accumulation of condensed water is effectively avoided, the safety performance of the product is improved, and the service life of the product is prolonged.
5. The Chinese patent with the granted publication number of CN 107244081B and the application number of 201710647270.5 discloses a combined die for preparing a carbon fiber reinforced wrinkled sandwich cylindrical shell; the Chinese patent with the publication number of CN 107283876B and the application number of 201710648357.4 discloses a method for preparing a carbon fiber reinforced wrinkled sandwiched cylindrical shell. Compared with the existing preparation process of the folded sandwich cylindrical shell, the preparation method has the following main differences and advantages:
(1) the folded sandwich product has different shapes: the product prepared by the existing preparation process of the folded sandwich cylindrical shell is in a folded sandwich cylindrical shell structure, while the product claimed by the invention is in a folded sandwich circular truncated cone shell structure;
(2) and an integral structure: the existing preparation process of the folded sandwich cylindrical shell adopts a method of firstly split forming and then assembling, namely, a folded core of the folded sandwich cylindrical shell is formed by assembling quarter circular-arc-shaped folded cores, an inner cylinder of the folded sandwich cylindrical shell is formed by buckling and arranging two semi-arc inner panels, and an outer cylinder of the folded sandwich cylindrical shell is formed by buckling and arranging two semi-arc inner panels. The invention adopts an integral forming method, namely the folded core of the folded sandwich circular truncated cone shell is a whole circular truncated cone-shaped folded core, the inner panel of the folded sandwich circular truncated cone shell is a whole circular truncated cone-shaped inner panel, and the outer panel of the folded sandwich circular truncated cone shell is a whole circular truncated cone-shaped outer panel.
(3) The invention with omitted elements: the existing preparation mould for the folded sandwich cylindrical shell comprises a core forming mould, a panel forming mould and a curing mould, namely, the preparation of the folded core, the inner and outer panels and the folded sandwich cylindrical shell respectively adopts respective special preparation moulds; the combined die comprises a core die and a panel die, wherein the core die is used for preparing the folded core, the panel die is used for preparing the inner panel and the outer panel, and the panel die is also used for the co-curing process of the folded core and the inner panel and the outer panel.
Drawings
Figure 1 is a schematic structural view of a first male mould 1-1 according to the invention;
figure 2 is a schematic view of the construction of a second male mould 1-2 according to the invention;
FIG. 3 is a schematic structural view of the female mold 1-3 of the present invention;
figure 4 is a schematic view of the first male die 1-1 of the invention in combination with the second male die 1-2;
FIG. 5 is a schematic view of the female mold 1-3 of the present invention in combination with the first male mold 1-1 and the second male mold 1-2;
FIG. 6 is a schematic structural view of the core mold outer support 1-5 of the present invention;
FIG. 7 is a schematic view of the core mold outer support 1-5 of the present invention in combination with the female mold 1-3, the first male mold 1-1, and the second male mold 1-2;
FIG. 8 is a schematic structural view of the inner support 1-6 of the first core mold of the present invention;
FIG. 9 is a schematic view of the construction of the inner supports 1-7 of the second core mold of the present invention;
FIG. 10 is a schematic structural view of a core mold of the present invention;
FIG. 11 is a schematic structural view of a first inner panel mold 2-1 of the present invention;
FIG. 12 is a schematic structural view of a second inner panel mold 2-2 of the present invention;
FIG. 13 is a schematic structural view of a third inner panel mold 2-3 of the present invention;
FIG. 14 is a schematic view of the structure of the first inner panel mold 2-1, the second inner panel mold 2-2 and the third inner panel mold 2-3 according to the present invention after they are assembled;
FIG. 15 is a schematic structural view of a first intermediate panel mold 2-4 of the present invention;
FIG. 16 is a schematic structural view of a second intermediate panel mold 2-5 of the present invention;
FIG. 17 is a schematic structural view of a third intermediate panel mold 2-6 of the present invention;
fig. 18 is a schematic view of the structure of the first intermediate panel mold 2-4, the second intermediate panel mold 2-5 and the third intermediate panel mold 2-6 of the present invention after they are combined;
FIG. 19 is a schematic view of the assembled inner panel mold body and middle panel mold body of the present invention;
FIG. 20 is a schematic structural view of the panel mold outer support 2-7 of the present invention;
FIG. 21 is a schematic view of the combined structure of the intermediate panel mold body and the panel mold outer support 2-7 of the present invention;
FIG. 22 is a schematic view of the structure of the supports 2-8 in the first panel mold of the present invention;
FIG. 23 is a schematic view of the structure of the support 2-9 within the second panel mold of the present invention;
FIG. 24 is a schematic structural view of a panel mold of the present invention;
FIG. 25 is a view showing the state of the panel mold of the present invention in the production of a sandwich circular truncated cone shell.
Detailed Description
The first embodiment is as follows: the hot press molding method of the fiber reinforced composite material pleated sandwich circular truncated cone shell according to the present embodiment will be described with reference to fig. 1 to 25,
the method is realized by the following steps:
firstly, preparing a fiber reinforced composite material corrugated core:
step a, cleaning a core die:
cleaning the core mould by using a detergent, and placing the core mould at a ventilation position for airing;
step b, coating a release agent:
uniformly coating the release agent on the surface of a core mold, and then placing the core mold in a ventilation position until the core mold is completely dried;
step c, assembling a core die:
assembling a first male die 1-1 and a second male die 1-2 in a core die into a complete circular truncated cone male die main body, connecting a first core die inner support 1-6 with the upper bottom surfaces of the first male die 1-1 and the second male die 1-2 through a connecting element, and connecting a second core die inner support 1-7 with the lower bottom surfaces of the first male die 1-1 and the second male die 1-2 through a connecting element;
d, cutting and laying of the prepreg:
firstly, calculating the geometric shape of the folded core after the folded core is completely unfolded according to the geometric size; inputting the prepreg into a prepreg cutting machine, cutting out the required prepreg, and laying the prepreg according to the designed laying sequence;
step e, folding the prepreg:
placing the cut prepreg on a heating table for heating, wherein the heating temperature is 30 ℃, after the prepreg is softened, placing the prepreg on the surfaces of a first male die 1-1 and a second male die 1-2, and externally pressing a female die 1-3 into the first male die 1-1 and the second male die 1-2 under the extrusion pressure of 0.5-1Mpa until the fiber prepreg is completely attached to the first male die 1-1 and the second male die 1-2 to obtain a prefabricated folded circular truncated cone shell;
step f, curing the prepreg:
after the twelve female dies 1-3 are completely attached to the first male die 1-1 and the second male die 1-2, installing two core die outer supports 1-5 outside the female dies, connecting the two core die outer supports 1-5 through a connecting element, and after the assembly is finished, putting the circular truncated cone shell-shaped folded prepreg obtained in the step e and the core die into an oven for curing at the curing temperature of 100-200 ℃ for 1-3 hours;
step g, demoulding of the folded core:
firstly, detaching two core mould outer supports 1-5 from the outside, then detaching a first core mould inner support 1-6 and a second core mould inner support 1-7 at the top and the bottom, then slowly taking out a second male mould 1-2, and then removing the first male mould 1-1 to obtain a whole block of cone-shaped folded core, thus finishing the preparation of the folded core of the folded sandwich cone shell;
secondly, preparing the fiber reinforced composite material inner panel:
step h, cleaning the panel die:
cleaning the panel mould by using a detergent, and placing the panel mould at a ventilation position for airing;
step i, coating a release agent:
uniformly coating a release agent on the surface of a panel mould, and then placing the panel mould at a ventilation position until the panel mould is completely dried;
step j, assembling the inner panel mold main body:
buckling a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3 in an inner panel mould main body together to form a hollow truncated cone shell structure, connecting a first panel mould inner support 2-8 with the upper bottom surface of the inner panel mould main body through a connecting element, connecting a second panel mould inner support 2-9 with the lower bottom surface of the inner panel mould main body through a connecting element, and fixing the positions of the first inner panel mould 2-1, the second inner panel mould 2-2 and the third inner panel mould 2-3;
step k, cutting and laying of the prepreg:
firstly, calculating the fan-shaped geometric dimension of a unfolded panel according to the geometric dimension, inputting the fan-shaped geometric dimension into a prepreg cutting machine, cutting out required prepreg, and laying the prepreg according to the designed laying sequence;
step l, laying of prepreg:
laying the cut prepreg on a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3, externally mounting a first middle panel mould 2-4, a second middle panel mould 2-5 and a third middle panel mould 2-6 in a middle panel mould main body, mounting two panel mould outer supports 2-7 outside the middle panel mould main body, buckling the two panel mould outer supports 2-7 left and right, connecting the two panel mould outer supports together through a connecting element, and connecting the lower bottom surfaces of the two panel mould outer supports 2-7 with a second panel mould inner support 2-9 through the connecting element;
step m, curing the prepreg:
putting the assembled panel mould into an oven for curing at 100-200 ℃ for 1-3 hours,
step n, demolding of the inner panel:
firstly, disassembling two panel mould outer supports 2-7, a first middle panel mould 2-4, a second middle panel mould 2-5 and a third middle panel mould 2-6, then disassembling a first panel mould inner support 2-8 and a second panel mould inner support 2-9, and then disassembling a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3 from the inside to obtain a whole block of frustum-shaped inner panel, thus finishing the preparation of the inner panel of the folded frustum shell;
thirdly, preparing the fiber reinforced composite material outer panel:
the preparation of the fiber reinforced composite outer panel is basically the same as the second step, but the difference is that,
in the step l: firstly, a first middle panel mould 2-4, a second middle panel mould 2-5 and a third middle panel mould 2-6 are arranged outside a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3, and then cut prepreg is laid on the first middle panel mould 2-4, the second middle panel mould 2-5 and the third middle panel mould 2-6;
in the step n: firstly, detaching the outer supports 2-7 of the two panel moulds, then detaching the inner supports 2-8 of the first panel mould and the inner supports 2-9 of the second panel mould, detaching the first inner panel mould 2-1, the second inner panel mould 2-2 and the third inner panel mould 2-3 from the inside, finally detaching the first middle panel mould 2-4, the second middle panel mould 2-5 and the third middle panel mould 2-6 from the inside, and finally completing the preparation of the outer panel of the folded sandwich circular truncated cone shell;
fourthly, assembling, gluing and secondary curing of the folded core of the fiber reinforced folded sandwich circular truncated cone shell and the inner and outer panels:
step o, pasting of an adhesive film:
pasting a layer of glue film on the inner surface of the outer panel and the outer surface of the inner panel:
step p, gluing the folded core with the inner panel and the outer panel:
bonding the folded core prepared in the first step with the interior of the outer panel prepared in the third step, then bonding the exterior of the inner panel prepared in the second step with the folded core to obtain a folded sandwich circular truncated cone shell, placing the bonded folded sandwich circular truncated cone shell on the outer surfaces of a first inner panel die 2-1, a second inner panel die 2-2 and a third inner panel die 2-3, installing a first panel die inner support 2-8 on the upper bottom surface of the folded sandwich circular truncated cone shell, installing a second panel die inner support 2-9 on the lower bottom surface of the folded sandwich circular truncated cone shell, and finally installing two panel die outer supports 2-7 on the outer surface of the folded sandwich circular truncated cone shell, wherein the two panel die outer supports 2-7 are connected together through a connecting element to fix the positions of the two panel die outer supports;
step q, curing the folded sandwich circular truncated cone shell:
putting the combined panel mould into an oven, wherein the curing temperature is 100-200 ℃, and the curing time is 1-3 hours;
step r, disassembling the panel mould:
firstly, detaching two panel mould outer supports 2-7, then detaching a first panel mould inner support 2-8 and a second panel mould inner support 2-9, and detaching a first inner panel mould 2-1, a second inner panel mould 2-2 and a third inner panel mould 2-3 from the inside to obtain the folded sandwich circular truncated cone shell, so that the preparation of the folded sandwich circular truncated cone shell is completed.
The second embodiment is as follows: referring to FIG. 1, the present embodiment will be described, wherein the pressure applied to the female molds 1 to 3 in the step e of the present embodiment is 0.75 MPa. Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment will be described with reference to fig. 1, wherein the curing temperature in step f of the present embodiment is 150 ℃ and the curing time is 2 hours. Other compositions and connections are the same as in the first or second embodiments.
The fourth concrete implementation mode: the present embodiment will be described with reference to fig. 1, wherein the curing temperature in step m of the present embodiment is 150 ℃ and the curing time is 2 hours. Other compositions and connection relationships are the same as in the first, second or third embodiment.
The fifth concrete implementation mode: the present embodiment will be described with reference to fig. 1, wherein the curing temperature in step q of the present embodiment is 150 ℃ and the curing time is 2 hours. Other compositions and connection relationships are the same as those in the first, second, third or fourth embodiment.
The combined die adopted by the hot-press molding method of the fiber reinforced composite material folded sandwich circular truncated cone shell comprises a core die and a panel die;
with reference to fig. 1 to 25, the core mold comprises a male mold body, a female mold body, a first core mold inner support 1-6, a second core mold inner support 1-7 and two core mold outer supports 1-5, the male mold body is a hollow truncated cone shell structure formed by combining a plurality of male molds, the inner wall surface of the male mold body is a circular table surface, the outer wall surface of the male mold body is provided with a plurality of quadrilateral units 1-4, wherein N quadrilateral units 1-4 with the same geometric shape are arranged along the circumferential direction of the male mold body, M quadrilateral units 1-4 which are expanded and contracted in a certain proportion are arranged along the bus direction of the male mold body, a female mold 1-3 is arranged between two adjacent quadrilateral units 1-4 in the N quadrilateral units 1-4 arranged along the circumferential direction, the female mold body comprises N female molds 1-3, the outer wall surface of the female die main body is a circular table surface, a plurality of quadrilateral units 1-4 are arranged on the inner wall surface of the female die 1-3, wherein, a quadrilateral unit 1-4 is arranged along the circumferential direction of a female die 1-3, M quadrilateral units 1-4 which are scaled in a certain proportion are arranged along the bus direction of the female die 1-3, the quadrilateral unit 1-4 on the inner wall surface of the female die 1-3 is completely occluded with the quadrilateral unit 1-4 corresponding to the quadrilateral unit on the outer wall surface of a male die body, two core die outer supports 1-5 are buckled to form a hollow core die outer support body with a truncated cone-shaped inner wall, the two core die outer supports 1-5 are buckled outside the combination of the male die body and the female die 1-3, a first core die inner support 1-6 is arranged on the upper bottom surface of the male die body, and a second core die inner support 1-7 is arranged on the lower bottom surface of the male die body;
the panel mould comprises an inner panel mould main body, a middle panel mould main body, a first panel mould inner support 2-8, a second panel mould inner support 2-9 and a two panel mould outer support 2-7, wherein the inner panel mould main body is a hollow round table shell structure formed by combining a plurality of inner panel moulds, the inner wall surface and the outer wall surface of each inner panel mould are round table surfaces, the middle panel mould main body is a hollow round table shell structure formed by combining a plurality of middle panel moulds, the inner wall surface and the outer wall surface of each middle panel mould are round table surfaces, the middle panel mould main body is buckled at the outer part of the inner panel mould main body, the two panel mould outer supports 2-7 are buckled to form a hollow panel mould outer support main body with a round table-shaped inner wall, the two panel mould outer supports 2-7 are buckled at the outer part of the middle panel mould main body, the first panel mould inner support 2-8 is arranged at the upper bottom surface of the inner panel mould main body, the second panel mould inner supports 2-9 are arranged on the lower bottom surface of the inner panel mould main body.
The two core die outer supports 1-5 of the core die are two identical semi-circular truncated cone shells which are connected through bolts and used for fixing the positions of the female dies 1-3 and providing pressure. The external supports 1-5 of the two core molds mainly play a role in fixing and prevent the female molds 1-3 from moving in a dislocation in the molding process. In addition, the presence of the two core mold outer supports 1-5 can provide the pressure required for molding due to the effects of thermal expansion of the cavity blocks 1-3.
Two panel mould outer supports 2-7 of the panel mould are two identical semi-circular truncated cone shells which are connected through bolts and used for fixing the position of a middle panel mould main body and providing pressure.
The number of male moulds is much smaller than that of the female moulds, and the number of male moulds is generally 3 or 4.
With reference to fig. 20, 24 and 25, the inner diameter of the upper bottom surface of the panel mold outer support main body is equal to the outer diameter of the upper bottom surface of the precured folded sandwich circular truncated cone shell, the inner diameter of the lower bottom surface of the panel mold outer support main body is equal to the outer diameter of the lower bottom surface of the precured folded sandwich circular truncated cone shell, and the outer support main body of the panel mold is equal to the height of the precured folded sandwich circular truncated cone shell; the outer diameter of the upper bottom surface of the inner panel die main body is equal to the inner diameter of the upper bottom surface of the precured folded sandwich circular truncated cone shell, the outer diameter of the lower bottom surface of the inner panel die main body is equal to the inner diameter of the lower bottom surface of the precured folded sandwich circular truncated cone shell, and the inner panel die main body is equal to the precured folded sandwich circular truncated cone shell in height. So configured, in addition to being used to manufacture the inner and outer panels, another important function of the panel mold is for the pleat core to bond and cure with the inner and outer panels. The middle panel mould body of the panel mould is not used in this process. Wherein, the outer panel is contacted with the inner wall surface of the outer support 2-7 of the two panel moulds, the inner panel is contacted with the outer wall surface of the inner panel mould main body, and the corrugated core 3-1 is filled in the position of the original middle panel mould main body. The first panel mould inner supports 2-8 are connected with the upper bottom surface of the inner panel mould main body to play a role in fixing. The second panel mould inner supports 2-9 are connected with the middle panel mould main body and the two panel mould outer supports 2-7.
With reference to fig. 1 to 5 and 11 to 18, a plurality of inner panel molds of the panel mold are cut from a circular truncated cone shell, and cutting lines on any section perpendicular to the axis of the circular truncated cone shell are parallel to each other; the middle panel dies of the panel die are formed by cutting a circular truncated cone shell, and cutting lines on any section perpendicular to the axis of the circular truncated cone shell are parallel to each other; the male dies of the core die are formed by cutting a circular truncated cone shell, and cutting lines on any section perpendicular to the axis of the circular truncated cone shell are parallel to each other. So set up, because the interior panel is panel in a monoblock round platform shape, interior panel mould main part design is detachable, can follow the inside dismantlement of panel in the round platform shape with panel mould in a plurality of to realize the smooth drawing of patterns of interior panel. Because the outer panel is a monoblock round platform shape outer panel, middle panel mould main part design is detachable, can be with panel mould dismantlement from round platform shape outer panel inside in the middle of a plurality of to realize the smooth drawing of patterns of outer panel. Because the fold core is a whole block of truncated cone-shaped fold core, and the male die main body of the core die is designed into a detachable structure, a plurality of male dies can be detached from the inside of the truncated cone-shaped fold core, so that smooth demolding of the fold core is realized.
The panel mould is formed by a round platform shell cutting in a plurality of panel mould, and the special character of cutting plane lies in: when viewed from any cross section perpendicular to the axis of the circular truncated cone shell, cutting lines on the cross section are parallel to each other; the purpose of setting up special cutting face is to guarantee that the assembling die can follow the inside demolding of round platform shell.
The panel mould is formed by a round platform shell cutting in the middle of a plurality of panel mould, and the special character of cutting plane lies in: when viewed from any cross section perpendicular to the axis of the circular truncated cone shell, cutting lines on the cross section are parallel to each other; the purpose of setting up special cutting face is to guarantee that the assembling die can follow the inside demolding of round platform shell.
The cutting surfaces of a plurality of male molds of the core mold are characterized in that: when viewed from any cross section perpendicular to the axis of the circular truncated cone shell, cutting lines on the cross section are parallel to each other; in addition, the cutting surface is required not to damage the quadrilateral units on the outer wall of the male die; the purpose of setting up special cutting face is to guarantee that the assembling die can follow the inside demolding of round platform shell.
With reference to fig. 10 and 24, a first core mold inner support 1-6 is disposed on the upper portion of the male mold body and connected to a plurality of male molds through a connecting member, and a second core mold inner support 1-7 is disposed on the lower portion of the male mold body and connected to a plurality of male molds and two core mold outer supports 1-5 through a connecting member; the first panel mould inner supports 2-8 are arranged at the upper part of the inner panel mould main body and are connected with the plurality of inner panel moulds through connecting elements, and the second panel mould inner supports 2-9 are arranged at the lower part of the inner panel mould main body and are connected with the plurality of inner panel moulds and the two panel mould outer supports 2-7 through the connecting elements. According to the arrangement, the inner supports 1-6 of the first core die and the inner supports 1-7 of the second core die of the core die are both disc-shaped structures, and the inner supports 1-6 of the first core die are fixed on the upper bottom surface of the male die through screws, so that the male die is fixed. The second core die inner supports 1-7 are fixed on the lower bottom surface of the male die through screws, and mainly play a role in fixing the position of the male die. Meanwhile, the second core mold inner support 1-7 is fixedly connected with the two core mold outer supports 1-5 through screws, and the two core mold outer supports 1-5 are mainly prevented from moving upwards along a bus and dislocating with the female mold 1-3.
The first panel mould inner support 2-8 and the second panel mould inner support 2-9 of the panel mould are both disc-shaped structures, and the first panel mould inner support 2-8 is fixed on the upper bottom surface of the inner panel mould through screws, so that the effect of fixing the inner panel mould is achieved. The second panel mold inner supports 2-9 are fixed on the lower bottom surface of the inner panel mold through screws and mainly play a role in fixing the position of the inner panel mold main body, meanwhile, the second panel mold inner supports 2-9 are fixedly connected with the two panel mold outer supports 2-7 through screws, and the two panel mold outer supports 2-7 are mainly prevented from moving upwards along a bus and dislocating with the middle panel mold main body.
With reference to fig. 1 to 5, the male mold body of the core mold comprises two first male molds 1-1 and two second male molds 1-2, the two first male molds 1-1 and the two second male molds 1-2 which are distributed in a staggered manner are combined into a circular truncated cone shaped male mold body, and 3 quadrilateral units 1-4 of each first male mold 1-1 are distributed along the circumferential direction and 5 quadrilateral units are distributed along the axial direction; the number of the quadrilateral units 1-4 of each second male die 1-2 is 3 in the circumferential direction, and the number of the quadrilateral units is 5 in the axial direction; the core die comprises twelve female dies 1-3, wherein 1 quadrilateral unit 1-4 of each female die 1-3 is distributed along the circumferential direction and 5 quadrilateral units are distributed along the axial direction. According to the arrangement, the corrugated core for preparing the corrugated sandwich circular truncated cone shell is a whole block of circular truncated cone-shaped corrugated core, the male die main body is designed to be a detachable structure, and the first male die 1-1 and the second male die 1-2 can be detached from the inside of the circular truncated cone-shaped corrugated core due to the particularity of the cutting surface, so that smooth demolding of the corrugated core is realized.
Each first male die 1-1 and each second male die 1-2 correspond to a quarter of a truncated cone shell, the outer walls of the first male die 1-1 and the second male die 1-2 are obtained by regularly arranging different quadrangles, a certain geometrical relationship is met between the quadrangles, and the inner wall is in a truncated cone shape.
Each female die 1-3 corresponds to one-tenth of a circular truncated cone, and the inner wall of each female die is formed by regularly arranging different quadrilateral units.
Referring to fig. 11 to 14, the inner panel mold main body of the panel mold includes a first inner panel mold 2-1, a second inner panel mold 2-2, and a third inner panel mold 2-3, the first inner panel mold 2-1 has a corresponding central angle of 90 °, the second inner panel mold 2-2 and the third inner panel mold 2-3 have a mirror symmetry structure, and the second inner panel mold 2-2 and the third inner panel mold 2-3 have a corresponding central angle of 135 °. According to the arrangement, the inner panel for preparing the folded sandwich circular truncated cone shell is a whole circular truncated cone-shaped inner panel, the inner panel die main body is designed to be detachable, and the first inner panel die 2-1, the second inner panel die 2-2 and the third inner panel die 2-3 can be detached from the inside of the circular truncated cone-shaped inner panel due to the particularity of the cutting surface, so that the smooth demolding of the inner panel is realized.
The upper bottom surface and the lower bottom surface of the inner panel mould main body are both provided with threaded holes for fixing the position of the inner panel mould main body, and the inner wall surfaces and the outer wall surfaces of the first inner panel mould 2-1, the second inner panel mould 2-2 and the third inner panel mould 2-3 are all round table surfaces.
Referring to fig. 15 to 18, the middle panel mold body of the panel mold includes a first middle panel mold 2-4, a second middle panel mold 2-5, and a third middle panel mold 2-6, the first middle panel mold 2-4 has a corresponding central angle of 90 °, the second middle panel mold 2-5 and the third middle panel mold 2-6 have a mirror symmetry structure, and the second middle panel mold 2-5 and the third middle panel mold 2-6 have a corresponding central angle of 135 °. According to the arrangement, the outer panel for preparing the folded sandwich circular truncated cone shell is a whole circular truncated cone-shaped outer panel, the middle panel die main body is designed to be detachable, and the first middle panel die 2-4, the second middle panel die 2-5 and the third middle panel die 2-6 can be detached from the inside of the circular truncated cone-shaped outer panel due to the particularity of the cutting surface, so that the outer panel can be smoothly demolded.
Referring to fig. 5, the quadrilateral units 1-4 on the first male mold 1-1, the second male mold 1-2 and the female mold 1-3 are all trapezoid units, each quadrilateral unit 1-4 comprises four quadrilaterals, and the four quadrilaterals are different. By the arrangement, the quadrilateral units 1-4 on the inner wall surface of the female die 1-3 of the core die are completely meshed with the corresponding quadrilateral units 1-4 on the outer wall surface of the male die main body, so that the corrugated core is extruded and molded.
Referring to fig. 7 and 10, the inner diameter of the upper bottom surface of the core mold outer support body is equal to the outer diameter of the upper bottom surface of the female mold body, the inner diameter of the lower bottom surface of the core mold outer support body is equal to the outer diameter of the lower bottom surface of the female mold body, and the core mold outer support body is equal to the female mold body in height. According to the arrangement, the quadrilateral units 1-4 on the inner wall surface of the female die 1-3 of the core die are completely meshed with the corresponding quadrilateral units 1-4 on the outer wall surface of the male die main body, the corrugated core prepreg is placed between the male die and the female die 1-3, and pressure is applied to the outer support main body of the core die from outside to inside, so that the corrugated core is extruded and formed by the male die and the female die.
Referring to fig. 24, the inner diameter of the upper bottom surface of the middle panel mold body is equal to the sum of the outer diameter of the upper bottom surface of the inner panel mold body and the thickness of the prepreg of the inner panel, the inner diameter of the lower bottom surface of the middle panel mold body is equal to the sum of the outer diameter of the lower bottom surface of the inner panel mold body and the thickness of the prepreg of the inner panel, and the middle panel mold body and the inner panel mold body are equal in height; the inner diameter of the upper bottom surface of the hollow panel mold outer support main body is equal to the sum of the outer diameter of the upper bottom surface of the middle panel mold main body and the prepreg thickness of the outer panel, the inner diameter of the lower bottom surface of the hollow panel mold outer support main body is equal to the sum of the outer diameter of the lower bottom surface of the middle panel mold main body and the prepreg thickness of the outer panel, and the outer support main body of the hollow panel mold and the middle panel mold main body are equal in height. According to the arrangement, the inner panel prepreg is arranged between the middle panel die body and the inner panel die body, the outer wall surface of the inner panel die body is matched with the inner wall surface of the middle panel die body, and pressure is applied to the middle panel die body from outside to inside, so that the middle panel die body and the inner panel die body extrude and form the inner panel of the folded sandwich circular truncated cone shell. The outer panel prepreg is arranged between the middle panel mould main body and the hollow panel mould outer support main body, the outer wall surface of the middle panel mould main body is matched with the inner wall surface of 2-7 outer supports of the two panel moulds, and pressure is applied to the hollow panel mould outer support main body from outside to inside, so that the outer support main body of the hollow panel mould and the middle panel mould main body extrude the outer panel of the folded sandwich circular truncated cone shell.
Claims (5)
1. The hot press molding method of the fiber reinforced composite material folded sandwich circular truncated cone shell is characterized in that: the method is realized by the following steps:
firstly, preparing a fiber reinforced composite material corrugated core:
step a, cleaning a core die:
cleaning the core mould by using a detergent, and placing the core mould at a ventilation position for airing;
step b, coating a release agent:
uniformly coating the release agent on the surface of a core mold, and then placing the core mold in a ventilation position until the core mold is completely dried;
step c, assembling a core die:
assembling a first male die (1-1) and a second male die (1-2) in a core die into a complete circular truncated cone male die main body, connecting an inner support (1-6) of the first core die with the upper bottom surfaces of the first male die (1-1) and the second male die (1-2) through a connecting element, and connecting an inner support (1-7) of the second core die with the lower bottom surfaces of the first male die (1-1) and the second male die (1-2) through a connecting element;
d, cutting and laying of the prepreg:
firstly, calculating the geometric shape of the folded core after the folded core is completely unfolded according to the geometric size; inputting the prepreg into a prepreg cutting machine, cutting out the required prepreg, and laying the prepreg according to the designed laying sequence;
step e, folding the prepreg:
placing the cut prepreg on a heating table for heating at the temperature of 30 ℃, placing the prepreg on the surfaces of a first male die (1-1) and a second male die (1-2) after the prepreg is softened, and pressing a female die (1-3) into the first male die (1-1) and the second male die (1-2) at the outside under the extrusion pressure of 0.5-1Mpa until the fiber prepreg is completely attached to the first male die (1-1) and the second male die (1-2) to obtain a prefabricated folded circular truncated cone shell;
step f, curing the prepreg:
after the twelve female dies (1-3) are completely attached to the first male die (1-1) and the second male die (1-2), installing two core die outer supports (1-5) outside the female dies, connecting the two core die outer supports (1-5) through a connecting element, and after the assembly is finished, putting the circular truncated cone shell-shaped prepreg folds and the core dies obtained in the step e into an oven for curing at the temperature of 100-200 ℃ for 1-3 hours;
step g, demoulding of the folded core:
firstly, detaching two core die outer supports (1-5) from the outside, then detaching a first core die inner support (1-6) and a second core die inner support (1-7) at the top and the bottom, then slowly taking out a second male die (1-2), and then removing the first male die (1-1), thus obtaining a whole block of truncated cone-shaped folded core, and thus, completing the preparation of the folded core of the folded truncated cone sandwich shell;
secondly, preparing the fiber reinforced composite material inner panel:
step h, cleaning the panel die:
cleaning the panel mould by using a detergent, and placing the panel mould at a ventilation position for airing;
step i, coating a release agent:
uniformly coating a release agent on the surface of a panel mould, and then placing the panel mould at a ventilation position until the panel mould is completely dried;
step j, assembling the inner panel mold main body:
buckling a first inner panel mould (2-1), a second inner panel mould (2-2) and a third inner panel mould (2-3) in an inner panel mould main body together to form a hollow circular truncated cone shell structure, connecting a first panel mould inner support (2-8) with the upper bottom surface of the inner panel mould main body through a connecting element, connecting a second panel mould inner support (2-9) with the lower bottom surface of the inner panel mould main body through a connecting element, and fixing the positions of the first inner panel mould (2-1), the second inner panel mould (2-2) and the third inner panel mould (2-3);
step k, cutting and laying of the prepreg:
firstly, calculating the fan-shaped geometric dimension of a unfolded panel according to the geometric dimension, inputting the fan-shaped geometric dimension into a prepreg cutting machine, cutting out required prepreg, and laying the prepreg according to the designed laying sequence;
step l, laying of prepreg:
laying the cut prepreg on a first inner panel mould (2-1), a second inner panel mould (2-2) and a third inner panel mould (2-3), then externally mounting a first middle panel mould (2-4), a second middle panel mould (2-5) and a third middle panel mould (2-6) in a middle panel mould main body, further externally mounting two panel mould outer supports (2-7) outside the middle panel mould main body, buckling the two panel mould outer supports (2-7) left and right, connecting the two panel mould outer supports together through a connecting element, and connecting the lower bottom surfaces of the two panel mould outer supports (2-7) with the second panel mould inner supports (2-9) through the connecting element;
step m, curing the prepreg:
putting the assembled panel mould into an oven for curing at 100-200 ℃ for 1-3 hours,
step n, demolding of the inner panel:
firstly, disassembling two panel mould outer supports (2-7), a first middle panel mould (2-4), a second middle panel mould (2-5) and a third middle panel mould (2-6), then disassembling a first panel mould inner support (2-8) and a second panel mould inner support (2-9), and then disassembling a first inner panel mould (2-1), a second inner panel mould (2-2) and a third inner panel mould (2-3) from the inside to obtain a whole circular truncated cone-shaped inner panel, thus finishing the preparation of the inner panel of the folded sandwich circular truncated cone shell;
thirdly, preparing the fiber reinforced composite material outer panel:
the preparation of the fiber reinforced composite outer panel is basically the same as the second step, but the difference is that,
in the step l: firstly, a first middle panel mould (2-4), a second middle panel mould (2-5) and a third middle panel mould (2-6) are arranged outside a first inner panel mould (2-1), a second inner panel mould (2-2) and a third inner panel mould (2-3), and then the cut prepreg is laid on the first middle panel mould (2-4), the second middle panel mould (2-5) and the third middle panel mould (2-6);
in the step n: firstly, disassembling two panel mould outer supports (2-7), then disassembling a first panel mould inner support (2-8) and a second panel mould inner support (2-9), disassembling a first inner panel mould (2-1), a second inner panel mould (2-2) and a third inner panel mould (2-3) from the inside, and finally disassembling a first middle panel mould (2-4), a second middle panel mould (2-5) and a third middle panel mould (2-6) from the inside, thereby finally completing the preparation of the outer panel of the folded sandwich circular truncated cone shell;
fourthly, assembling, gluing and secondary curing of the folded core of the fiber reinforced folded sandwich circular truncated cone shell and the inner and outer panels:
step o, pasting of an adhesive film:
pasting a layer of glue film on the inner surface of the outer panel and the outer surface of the inner panel:
step p, gluing the folded core with the inner panel and the outer panel:
bonding the corrugated core prepared in the first step with the inner part of the outer panel prepared in the third step, and then bonding the outer part of the inner panel prepared in the second step with the corrugated core to obtain a corrugated sandwich circular truncated cone shell, wherein the bonded corrugated sandwich circular truncated cone shell is placed on the outer surfaces of a first inner panel die (2-1), a second inner panel die (2-2) and a third inner panel die (2-3), a first panel die inner support (2-8) is arranged on the upper bottom surface of the corrugated sandwich circular truncated cone shell, a second panel die inner support (2-9) is arranged on the lower bottom surface of the corrugated sandwich circular truncated cone shell, and finally two panel die outer supports (2-7) are arranged on the outer surface of the corrugated sandwich circular truncated cone shell, and the two panel die outer supports (2-7) are connected together through connecting elements to fix the positions of the corrugated sandwich circular truncated cone shell;
step q, curing the folded sandwich circular truncated cone shell:
putting the combined panel mould into an oven, wherein the curing temperature is 100-200 ℃, and the curing time is 1-3 hours;
step r, disassembling the panel mould:
firstly, disassembling two panel mould outer supports (2-7), then disassembling a first panel mould inner support (2-8) and a second panel mould inner support (2-9), and disassembling a first inner panel mould (2-1), a second inner panel mould (2-2) and a third inner panel mould (2-3) from the inside to obtain a folded sandwich circular truncated cone shell, so that the preparation of the folded sandwich circular truncated cone shell is completed;
the core die comprises a male die body, a female die body, a first core die inner support (1-6), a second core die inner support (1-7) and two core die outer supports (1-5), wherein the male die body is a hollow circular truncated cone shell structure formed by combining a plurality of male dies, the inner wall surface of the male die body is a circular table surface, the outer wall surface of the male die body is provided with a plurality of quadrilateral units (1-4), N quadrilateral units (1-4) with the same geometric shape are arranged along the circumferential direction of the male die body, M quadrilateral units (1-4) which are expanded and contracted in a certain proportion are arranged along the bus direction of the male die body, a female die (1-3) is arranged between two adjacent quadrilateral units (1-4) in the N quadrilateral units (1-4) arranged along the circumferential direction, and the female die body comprises N female dies (1-3), the outer wall surface of a female die body is a circular table surface, the inner wall surface of the female die (1-3) is provided with a plurality of quadrilateral units (1-4), wherein one quadrilateral unit (1-4) is arranged along the circumferential direction of the female die (1-3), M quadrilateral units (1-4) which are expanded and contracted in a certain proportion are arranged along the bus direction of the female die (1-3), the quadrilateral units (1-4) on the inner wall surface of the female die (1-3) are completely occluded with the corresponding quadrilateral units (1-4) on the outer wall surface of a male die body, two core die outer supports (1-5) are buckled to form a hollow core die outer support body with a circular table-shaped inner wall, the two core die outer supports (1-5) are buckled outside the combination of the male die body and the female die (1-3), a first core die inner support (1-6) is arranged on the upper bottom surface of the male die body, the second core mould inner support (1-7) is arranged on the lower bottom surface of the male mould main body;
the panel mould comprises an inner panel mould main body, a middle panel mould main body, a first panel mould inner support (2-8), a second panel mould inner support (2-9) and a two panel mould outer support (2-7), wherein the inner panel mould main body is a hollow round platform shell structure formed by combining a plurality of inner panel moulds, the inner wall surface and the outer wall surface of the inner panel mould are round platform surfaces, the middle panel mould main body is a hollow round platform shell structure formed by combining a plurality of middle panel moulds, the inner wall surface and the outer wall surface of the middle panel mould are round platform surfaces, the middle panel mould main body is buckled at the outer part of the inner panel mould main body, the two panel mould outer supports (2-7) are buckled to form the hollow panel mould outer support main body with the inner wall in a round platform shape, and the two panel mould outer supports (2-7) are buckled at the outer part of the middle panel mould main body, the first panel mould inner support (2-8) is arranged on the upper bottom surface of the inner panel mould main body, and the second panel mould inner support (2-9) is arranged on the lower bottom surface of the inner panel mould main body;
the inner panel dies of the panel die are formed by cutting a circular truncated cone shell, and cutting lines on any section perpendicular to the axis of the circular truncated cone shell are parallel to each other; the middle panel dies of the panel die are formed by cutting a circular truncated cone shell, and cutting lines on any section perpendicular to the axis of the circular truncated cone shell are parallel to each other; the male dies of the core die are formed by cutting a circular truncated cone shell, and cutting lines on any section perpendicular to the axis of the circular truncated cone shell are parallel to each other.
2. The hot press molding method of the fiber reinforced composite material wrinkled sandwich circular truncated cone shell according to claim 1, which is characterized in that: and in the step e, the pressure applied to the female die (1-3) is 0.75 MPa.
3. The hot press molding method of the fiber reinforced composite material wrinkled sandwich circular truncated cone shell according to claim 1, which is characterized in that: the curing temperature in the step f is 150 ℃, and the curing time is 2 hours.
4. The hot press molding method of the fiber reinforced composite material wrinkled sandwich circular truncated cone shell according to claim 1, which is characterized in that: the curing temperature in step m was 150 ℃ and the curing time was 2 hours.
5. The hot press molding method of the fiber reinforced composite material wrinkled sandwich circular truncated cone shell according to claim 1, which is characterized in that: the curing temperature in step q was 150 ℃ and the curing time was 2 hours.
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