CN112549378A - Integrated forming die and method for composite material corrugated interlayer cylinder - Google Patents
Integrated forming die and method for composite material corrugated interlayer cylinder Download PDFInfo
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- CN112549378A CN112549378A CN202011267958.9A CN202011267958A CN112549378A CN 112549378 A CN112549378 A CN 112549378A CN 202011267958 A CN202011267958 A CN 202011267958A CN 112549378 A CN112549378 A CN 112549378A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
- B29C33/301—Modular mould systems [MMS], i.e. moulds built up by stacking mould elements, e.g. plates, blocks, rods
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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
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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
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3097—Cosmonautical vehicles; Rockets
Abstract
The invention discloses an integrated forming die and a method for a composite material corrugated interlayer cylinder. The composite material corrugated sandwich cylinder is prepared by adopting an inner cylindrical die, a cell element die and a positioning disc through three times of curing, an inner panel, a trapezoidal corrugated sandwich structure and an outer panel are integrally formed, the panel and the trapezoidal corrugated sandwich structure are continuous, and the integral mechanical property of the composite material corrugated sandwich cylinder is improved; the die has the advantages of reasonable design, simple structure, convenient assembly and disassembly, strong reusability, and the mutual matching of the cell die and the positioning plate, thereby ensuring the accurate positioning of the cell die; the positioning disc can be reused, so that the cost is saved; firstly, semi-curing is carried out twice, so that the compaction degree of the composite material corrugated interlayer cylinder is ensured, and the mechanical property of the structure is improved; the process method is simple to realize, convenient to process and high in flexibility, and the composite material corrugated interlayer cylinders with different thicknesses and different trapezoidal cell numbers can be prepared by only using one set of inner cylindrical die and positioning disc die.
Description
Technical Field
The invention relates to a technology for preparing a composite material corrugated sandwich cylinder, in particular to an integrated forming die and a forming method of the composite material corrugated sandwich cylinder.
Background
Along with the rapid development of aerospace and aviation industries, the further improvement of the carrying capacity and carrying efficiency of the spacecraft is of great importance. The sandwich structure is the structure with the highest axial pressure instability bearing efficiency, and compared with structures such as a honeycomb sandwich layer and a foam sandwich layer, the trapezoidal corrugated sandwich structure has higher bearing efficiency and lower manufacturing cost, and the performance of carbon fiber materials is greatly improved in recent years.
At present, an inner panel, an outer panel and a corrugated core layer are separated for preparing a composite material corrugated sandwich cylinder body, each structure is prepared independently and then is bonded together by glue, and the preparation can cause defects at the bonding position and further cause the reduction of the mechanical property of the structure.
Disclosure of Invention
The invention provides an integrated forming die of a composite corrugated interlayer cylinder and a forming method thereof, aiming at solving the problems that the structural mechanical property is poor, a special die is lacked, the preparation process is complicated and the batch production cannot be realized due to the fact that core layer sectional bonding and the bonding between a core layer and a panel are adopted in the conventional method for preparing the composite corrugated interlayer cylinder.
The composite material corrugated sandwich cylinder comprises an inner panel, a trapezoidal corrugated core layer and an outer panel, wherein the cylindrical outer panel is coaxially sleeved outside the inner panel, the trapezoidal corrugated core layer is arranged between the inner panel and the outer panel, the trapezoidal corrugated core layer comprises a plurality of cells which are centrosymmetrically and closely distributed, each cell comprises two subcells, the cross section of the inner space of each subcell is trapezoidal, the upper bottom and the lower bottom of each subcell are both arc-shaped, the trapezoidal upper bottom of one subcell is larger than the lower bottom, and the trapezoidal lower bottom of the other subcell is larger than the upper bottom.
The invention aims to provide an integrated forming die for a composite material corrugated sandwich cylinder.
The integrated forming die of the composite material corrugated interlayer cylinder body comprises: the device comprises an inner cylindrical die, an inner die positioning structure, a positioning hoisting shaft, an inner die detachable structure, a positioning disc positioning structure, a positioning disc detachable structure, a positioning cell die structure, a cell die, a demoulding groove, a cell die positioning structure, a demoulding rod and a demoulding base; wherein the content of the first and second substances,
the outer surface of the inner cylindrical die is cylindrical, and the diameter of the cylinder is the inner diameter of the inner panel of the composite material corrugated interlayer cylinder; the centers of two end faces of the inner cylindrical die are respectively provided with an inner die positioning structure; a positioning hoisting shaft is arranged at the center of the inner die positioning structure; a plurality of detachable structures of the inner die which are distributed in central symmetry are arranged on two end surfaces of the inner cylindrical die and around the positioning structure of the inner die;
the two positioning disks have the same structure and are flat-shaped; a positioning plate positioning structure is arranged in the center of the positioning plate, and the shape of the positioning plate positioning structure is complementary with that of the inner mold positioning structure; a plurality of positioning disc detachable structures which are distributed in a central symmetry manner are arranged on the positioning disc and around the positioning disc positioning structure corresponding to each inner mold detachable structure; a plurality of positioning cell element mould structures which are distributed in central symmetry are arranged on the positioning disc and around the detachable structure of the positioning disc;
a plurality of sets of cell element molds are arranged corresponding to each set of cell elements of the composite material corrugated interlayer cylinder body, each set of cell element mold comprises two sub-cell element molds, and the shapes of the two sub-cell element molds are respectively the same as the shapes of the inner spaces of the two sub-cell elements in the cell elements; the center of two end faces of each sub-cell element mold is respectively provided with a demolding groove; corresponding to the plurality of positioning cell element mould structures on the positioning disc, cell element mould positioning structures are respectively arranged at the centers of two ends of the plurality of corresponding sub-cell element moulds, and for the sub-cell element moulds provided with the cell element mould positioning structures, the demoulding groove is arranged at the center of the cell element mould positioning structure;
the demoulding rod is cylindrical, the end face of the top end of the demoulding rod is provided with a demoulding boss which is matched with a demoulding groove of the daughter cell element mould, and the side wall of the bottom end of the demoulding rod is provided with a positioning clamping groove which is matched and connected with a demoulding base; the upper surface of the demoulding base is complementary with the positioning clamping groove in shape and is placed on the mounting position of the demoulding machine, and the bottom end of the demoulding rod is fixed on the demoulding base through the positioning clamping groove;
respectively paving fiber prepreg on the outer side wall of the inner cylindrical mold and the outer side wall of each subcell mold, wrapping two layers of biaxially oriented polypropylene films on the paved fiber prepreg, and semi-curing; after semi-curing, removing the biaxially oriented polypropylene film wrapped on the fiber prepreg; an inner die positioning structure on one end face of the inner cylindrical die and a positioning disc positioning structure of a positioning disc are oppositely and positively arranged, the positions of the inner die detachable structure and the positioning disc detachable structure are aligned, and the mounting piece sequentially passes through the positioning disc detachable structure and the corresponding inner die detachable structure to install the positioning disc on one end face of the inner cylindrical die semi-cured with the fiber prepreg; installing the sub-cell element molds with the cell element mold positioning structures at the two ends on a positioning disc through the positioning cell element mold structures respectively; another positioning disc is installed; correspondingly installing the rest of the subcell dies semi-cured with the fiber prepreg on the outer side wall of the inner cylindrical die semi-cured with the fiber prepreg, enabling a plurality of groups of the subcell dies semi-cured with the fiber prepreg to be tightly attached to the outer side wall of the inner cylindrical die to form a ring shape, and winding two layers of biaxially oriented polypropylene films on the outer side walls of the subcell dies to perform secondary semi-curing; after semi-curing, removing the wrapped biaxially oriented polypropylene film; laying fiber prepreg on the outer side wall of a plurality of groups of cell element molds semi-cured secondarily with the fiber prepreg, wrapping two layers of biaxially oriented polypropylene films on the outer surface of the fiber prepreg, and curing; and after curing, removing the inner cylindrical die, fixing the bottom end of the demolding rod on the demolding base through the positioning clamping groove, matching the demolding boss at the top end of the demolding rod with the demolding groove of the subcell die, drawing out each subcell die, and finally removing the biaxially oriented polypropylene film to obtain the integrally molded composite material corrugated interlayer cylinder.
The inner cylindrical die, the positioning disc and the cell die are all made of steel.
The positioning structure of the positioning disc corresponds to the positioning structure of the inner die, the positioning structure of the positioning disc is a through hole, and the positioning structure of the inner die is a boss; or the positioning structure of the positioning plate is a boss, and the positioning structure of the inner die is a corresponding groove.
The detachable structure of the inner die is a mounting groove and is provided with an internal thread; the detachable structure of the positioning plate is a mounting hole and is provided with an internal thread; the mounting piece is a screw; the inner die detachable structure is consistent with the aperture of the positioning disc detachable structure, each mounting hole is aligned with the corresponding mounting groove, the mounting holes and the corresponding mounting grooves are sequentially penetrated through screws, and the positioning disc is mounted on the end face of the inner cylindrical die.
The shapes of the cell element mold positioning structure and the positioning cell element mold structure are matched; the positioning cell element mold structure is a through hole, and the positioning cell element mold structure is a bulge; the positioning cell element mold structure is a protrusion, and the positioning cell element mold structure is a groove.
The length of the positioning cell element mould structure on the positioning disc in the radial direction is greater than that of the positioning structure on the end face of the sub cell element mould, so that the sub cell element mould can move to the axis of the inner cylindrical mould after being pressed on the premise of ensuring the positioning accuracy, and the internal compactness of the structure is ensured.
The length of each sub-cell element die is slightly smaller than that of the cylindrical die, so that the upper end face and the lower end face of each sub-cell element die are not in contact with the surface of the positioning disc, and the movement of the sub-cell element die to the axis of the inner cylindrical die after being pressed is not hindered. The length of each subcell die is 1-2 mm shorter than that of the inner cylindrical die.
The demoulding groove of the daughter cell element mould is processed with an internal thread, and the outer surface of the demoulding boss on the demoulding rod is processed with an external thread which is matched and connected with the demoulding groove of the daughter cell element mould.
The composite material corrugated interlayer cylinders with different numbers and sizes of the cell elements can be positioned by adopting the positioning cell element mold structure with the same number and position, the reusability of the positioning disk is improved, and the cost is saved.
The invention also aims to provide an integrated forming method of the composite material corrugated sandwich cylinder.
The invention discloses an integrated molding method of a composite material corrugated sandwich cylinder, which comprises the following steps:
1) cleaning the outer surface of the inner cylindrical die and the outer surface of each sub-cell die, then sequentially and uniformly coating a release agent on the outer surfaces, and coating a hole sealing agent on the release grooves of the sub-cell dies for hole sealing;
2) cutting the fiber prepreg according to the required size;
3) laying cut fiber prepreg on the outer side wall of the cleaned inner cylindrical die and the outer side wall of each subcell die respectively, and wrapping two layers of biaxially oriented polypropylene films on the laid fiber prepreg;
4) placing the inner cylindrical die wrapped with the biaxially oriented polypropylene film and each subcell die in an autoclave for semi-curing;
5) after semi-curing, taking the semi-cured inner cylindrical die and each subcell die out of the autoclave, cooling to room temperature, and removing the biaxially oriented polypropylene film wrapped on the fiber prepreg;
6) installing a die:
a) the method comprises the following steps that an inner die positioning structure on one end face of an inner cylindrical die and a positioning disc positioning structure of a positioning disc are oppositely and positively arranged, the position of an inner die detachable structure is aligned with that of a positioning disc detachable structure, a mounting piece sequentially passes through the positioning disc detachable structure and the inner die detachable structure, and the positioning disc is arranged on one end face of the inner cylindrical die semi-cured with fiber prepreg;
b) installing the sub-cell element molds with the cell element mold positioning structures at the two ends on a positioning disc through the positioning cell element mold structures respectively;
c) according to the method of the step a), another positioning disc is arranged at the other end of the inner cylindrical mould;
d) correspondingly placing the rest of the subcell dies semi-cured with the fiber prepreg on the outer side wall of the inner cylindrical die semi-cured with the fiber prepreg, wherein the plurality of groups of the subcell dies semi-cured with the fiber prepreg are tightly attached to the outer side wall of the inner cylindrical die by utilizing the viscosity of the surface of the fiber prepreg to form a circular ring shape;
e) winding two layers of biaxially oriented polypropylene films on the outer surface of the cell element die;
7) putting the die installed in the step 6) into the autoclave again for second semi-curing;
8) after the second semi-curing, taking the structure semi-cured for the second time in the step 7) out of the autoclave, cooling to room temperature, and removing the wrapped biaxially oriented polypropylene film;
9) laying fiber prepreg on the outer side wall of a plurality of groups of cell element molds semi-cured secondarily with the fiber prepreg, and wrapping two layers of biaxially oriented polypropylene films on the outer surface of the fiber prepreg;
10) placing the mixture in an autoclave for final curing;
11) and after curing, taking out the composite material corrugated interlayer cylinder from the autoclave, cooling to room temperature, removing the hole sealing agent in the demolding grooves of all the subcell dies, removing the inner cylindrical die, fixing the bottom end of the demolding rod on the demolding base through the positioning clamping groove, matching the demolding boss at the top end of the demolding rod with the demolding groove of the subcell die, drawing out each subcell die, removing the biaxially oriented polypropylene film, and polishing the end face to obtain the integrally-formed composite material corrugated interlayer cylinder.
Wherein in the step 4), the curing pressure in the autoclave is 1-2 MPa, the curing temperature is 80-90 ℃, and the curing time is 1-2 hours.
In step 6), the inner mold detachable structure and the positioning plate detachable structure are respectively provided with internal threads, and the mounting part adopts a screw with external threads.
In the step 7), in the second semi-curing, the curing pressure in the autoclave is 1-2 MPa, the curing temperature is 80-90 ℃, and the curing time is 1-2 hours.
In the step 10), the curing pressure in the autoclave is 2-3 MPa, the curing temperature is 120-130 ℃, and the curing time is 1.5-2 hours.
The invention has the advantages that:
the composite material corrugated sandwich cylinder is prepared by adopting the inner cylindrical die, the cell element die and the positioning disc through three times of curing, the inner panel, the trapezoidal corrugated sandwich structure and the outer panel are integrally formed, the panel and the trapezoidal corrugated sandwich structure are continuous, the integral mechanical property of the composite material corrugated sandwich cylinder is improved, and the guarantee is provided for further researching the mechanical property of the structure; the die has the advantages of reasonable design, simple structure, convenient assembly and disassembly, strong reusability, and the mutual matching of the cell die and the positioning plate, thereby ensuring the accurate positioning of the cell die; the positioning disc can be reused, so that the cost is saved; according to the invention, semi-curing is firstly carried out twice, so that the compaction degree of the composite material corrugated interlayer cylinder is ensured, and the mechanical property of the structure is improved; the process method is simple to realize, convenient to process and high in flexibility, and the composite material corrugated interlayer cylinders with different thicknesses and different trapezoidal cell numbers can be prepared by only using one set of inner cylindrical die and positioning disc die.
Drawings
FIG. 1 is a schematic view of a composite corrugated sandwich cylinder;
FIG. 2 is a schematic overall structure diagram of an embodiment of an integrated molding die for a composite material corrugated sandwich cylinder of the present invention;
FIG. 3 is a schematic view of an inner cylindrical mold of one embodiment of the integrated molding mold of the composite corrugated sandwich cylinder of the present invention;
FIG. 4 is a schematic view of a puck of one embodiment of the integrated molding die for a composite corrugated sandwich cylinder of the present invention;
fig. 5 is a schematic view of a subcell mold of one embodiment of the integrated molding mold for a composite corrugated sandwich cylinder of the present invention;
fig. 6 is a schematic view of the end face of the subcell mold of one embodiment of the integrated molding mold for the composite material corrugated sandwich cylinder of the present invention provided with a cell mold positioning structure;
FIG. 7 is a schematic view of a knockout bar and a knockout base of one embodiment of an integrated forming die for a composite corrugated sandwich can of the present invention;
FIG. 8 is a schematic view of an inner cylindrical mold of one embodiment of an integrated molding mold for a composite corrugated sandwich cylinder of the present invention laying down fiber prepregs;
fig. 9 is a schematic view of a subcell mold laying fiber prepreg of one embodiment of the integrated molding mold for composite corrugated sandwich cylinder of the present invention;
fig. 10 is a schematic view of laying fiber prepregs after installation of a mold of one embodiment of the integrated molding mold for a composite material corrugated sandwich cylinder of the present invention.
Detailed Description
The invention will be further elucidated by means of specific embodiments in the following with reference to the drawing.
As shown in fig. 1, the composite corrugated sandwich cylinder includes an inner panel 01, a trapezoidal corrugated core layer 02 and an outer panel 03, the cylindrical outer panel 03 is coaxially sleeved outside the inner panel 01, the trapezoidal corrugated core layer 02 is disposed between the inner panel and the outer panel, the trapezoidal corrugated core layer 02 includes a plurality of cells 021 which are centrosymmetrically and closely distributed, each cell includes two sub-cells, the cross section of the inner space of each sub-cell is trapezoidal, the upper and lower bottoms of the trapezoidal core are arc-shaped, the upper bottom of the trapezoidal core of one sub-cell is larger than the lower bottom, and the lower bottom of the trapezoidal core of the other sub-cell is larger than the upper bottom, wherein the left side is a perspective view, and the right side is a cross-.
As shown in fig. 2, the integrated molding mold for the composite material corrugated sandwich cylinder of the present embodiment includes: the device comprises an inner cylindrical die 1, an inner die positioning structure 1-1, an inner die detachable structure 1-2, a positioning hoisting shaft 1-3, a positioning disc 2, a positioning cell die structure 2-1, a positioning disc positioning structure 2-2, a positioning disc detachable structure, a cell die 3, a demoulding groove, a cell die positioning structure 4, a demoulding rod 5 and a demoulding base 6; wherein the content of the first and second substances,
as shown in fig. 3, the outer surface of the inner cylindrical mold 1 is cylindrical, and the diameter of the cylinder is the inner diameter of the inner panel of the composite material corrugated sandwich cylinder; the centers of two end faces of the inner cylindrical die 1 are respectively provided with an inner die positioning structure 1-1, and the inner die positioning structure 1-1 is a boss; a positioning hoisting shaft 1-3 is arranged at the center of the inner die positioning structure 1-1 and used for carrying the inner cylindrical die; four inner mold detachable structures 1-2 which are distributed in central symmetry are arranged on two end faces of the inner cylindrical mold 1 and around the inner mold positioning structure 1-1, and the inner mold detachable structures 1-2 are installation grooves and are provided with internal threads;
as shown in fig. 4, the two positioning plates 2 have the same structure, and the positioning plates 2 are flat plates; a positioning plate positioning structure 2-2 is arranged in the center of the positioning plate 2, the positioning plate positioning structure 2-2 is a through hole, and the positioning plate positioning structure 2-2 and the inner die positioning structure 1-1 are structures with complementary shapes; corresponding to each inner mold detachable structure 1-2, four positioning disk detachable structures which are distributed in a central symmetry manner are arranged on the positioning disk 2 and around the positioning disk positioning structure 2-2, and the positioning disk detachable structures are mounting holes and are provided with internal threads; the diameter of the detachable structure 1-2 of the inner die is consistent with that of the detachable structure of the positioning disc, each mounting hole is aligned with the corresponding mounting groove, the mounting holes and the corresponding mounting grooves are sequentially penetrated through mounting pieces 2-3, the mounting pieces adopt screws, and one positioning disc 2 is mounted on one end face of the inner cylindrical die 1; four positioning cell element mold structures 2-1 which are distributed in central symmetry are arranged on the positioning disc 2 and around the detachable structure of the positioning disc, and the positioning cell element mold structures are through holes;
as shown in fig. 5, ten sets of cell molds 3 are disposed corresponding to each set of cells of the composite material corrugated sandwich cylinder, each set of cell mold 3 includes two sub-cell molds, and the shapes of the two sub-cell molds are respectively the same as the shapes of the internal spaces of the two sub-cells in the set of cells; the center of two end faces of each sub-cell element mold is respectively provided with a demolding groove; corresponding to the direction of the four positioning cell element mold structures 2-1 on the positioning disc 2, cell element mold positioning structures 4 are respectively arranged at the centers of the two ends of the corresponding four sub-cell element molds, the cell element mold positioning structures are bulges matched with the shapes of the through holes for positioning the cell element mold structures, for the sub-cell element molds provided with the cell element mold positioning structures 4, demolding grooves are arranged at the centers of the cell element mold positioning structures, and the demolding grooves of the sub-cell element molds are processed with internal threads, as shown in fig. 6;
as shown in fig. 7, the demoulding rod 5 is a cylinder, the end surface of the top end is provided with a demoulding boss, the outer surface of the boss is provided with an external thread which is matched with the thread of the demoulding groove of the daughter cell element mould, and the side wall of the bottom end is provided with an upper positioning clamping groove which is matched and connected with the demoulding base 6; the upper surface shape of the demoulding base 6 is complementary with the positioning clamping groove, and the demoulding base is placed at the mounting position of the demoulding machine;
in this embodiment, the inner cylindrical mold 1, the positioning plate 2 and the cell mold 3 are made of high-strength mold steel.
The integrated forming method of the composite material corrugated sandwich cylinder body comprises the following steps:
1) cleaning the outer surface of the inner cylindrical die 1 and the outer surface of each sub-cell die by using an acetone solution, then sequentially and uniformly coating a release agent on the outer surfaces, and coating a hole sealing agent on the release grooves of the sub-cell dies for hole sealing;
2) cutting the carbon fiber prepreg according to the required size;
3) respectively placing carbon fiber prepregs on the outer side wall of the cleaned inner cylindrical mold 1 and the outer side wall of each subcell mold as shown in fig. 8 and 9, wherein 7 represents the carbon fiber prepregs, laying the cut carbon fiber prepregs, and wrapping two biaxially oriented polypropylene films on the laid carbon fiber prepregs;
4) placing the inner cylindrical die 1 wrapped with the biaxially oriented polypropylene film and each subcell die in an autoclave for semi-curing at a curing pressure of 2MPa and a curing temperature of 85 ℃ for 1 hour;
5) after semi-curing, taking the semi-cured inner cylindrical mold 1 and each subcell mold out of the autoclave, cooling to room temperature, and removing the biaxially oriented polypropylene film wrapped on the carbon fiber prepreg;
6) installing a die:
a) the method comprises the following steps that a bulge of an inner mold positioning structure 1-1 at one end of an inner cylindrical mold 1 is oppositely and positively arranged with a through hole of a positioning disk positioning structure 2-2 of a positioning disk 2, the position of an inner mold detachable structure 1-2 is aligned with the position of the positioning disk detachable structure, a screw is sequentially arranged through an installation hole of the positioning disk detachable structure and an installation groove of the inner mold detachable structure 1-2, and the positioning disk 2 is installed on one end face of the inner cylindrical mold 1 semi-cured with carbon fiber prepreg;
b) respectively installing the subcell dies with the cell die positioning structures 4 at the two ends on the positioning disc 2 through the positioning cell die structure 2-1;
c) according to the method of the step a), another positioning disc 2 is arranged at the other end of the inner cylindrical mould 1;
d) the rest of the sub-cell element molds are correspondingly arranged on the outer side wall of the inner cylindrical mold 1 semi-cured with the carbon fiber prepreg, and the plurality of groups of cell element molds 3 are tightly attached to the outer side wall of the inner cylindrical mold 1 by utilizing the viscosity of the surface of the carbon fiber prepreg to form a ring shape;
e) winding two layers of biaxially oriented polypropylene films on the outer surface of the cell element die 3;
7) putting the die installed in the step 6) into the autoclave again, and performing second semi-solidification at the curing temperature of 85 ℃ under the pressure of 2MPa for 1 hour;
8) after semi-curing, taking the structure semi-cured for the second time in the step 7) out of the autoclave, cooling to room temperature, and removing the wrapped biaxially oriented polypropylene film;
9) laying carbon fiber prepregs on the outer side walls of the plurality of groups of cell dies 3, and wrapping two layers of biaxially oriented polypropylene films on the outer surfaces of the carbon fiber prepregs as shown in fig. 10;
10) placing the mixture in an autoclave for final curing, wherein the curing pressure is 3MPa, the curing temperature is 125 ℃, and the curing time is 2 hours;
11) and after curing, taking out the composite material corrugated interlayer cylinder from the autoclave, cooling to room temperature, removing the hole sealing agent in the demolding grooves of all the subcell dies, removing the inner cylindrical die 1, drawing out each subcell die by adopting a demolding rod 5 in cooperation with a demolding base 6, removing the biaxially oriented polypropylene film, and polishing the end face to obtain the integrally molded composite material corrugated interlayer cylinder.
Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.
Claims (10)
1. The utility model provides an integration forming die of combined material ripple intermediate layer barrel, combined material ripple intermediate layer barrel includes inner panel, trapezoidal ripple sandwich layer and outer panel, the cover of cylindric outer panel is outside the inner panel coaxially, be trapezoidal ripple sandwich layer between the two, trapezoidal ripple sandwich layer includes a plurality of cell elements that are central symmetry and closely distribute, each cell element includes two subcells, the cross-section of the inner space of each subcell element is trapezoidal, trapezoidal upper and lower end is the arc, the trapezoidal upper base of a subcell is greater than and goes to the bottom, the trapezoidal lower base of another subcell is greater than the upper base, a serial communication port, the integration forming die of combined material ripple intermediate layer barrel includes: the device comprises an inner cylindrical die, an inner die positioning structure, a positioning hoisting shaft, an inner die detachable structure, a positioning disc positioning structure, a positioning disc detachable structure, a positioning cell die structure, a cell die, a demoulding groove, a cell die positioning structure, a demoulding rod and a demoulding base; wherein the content of the first and second substances,
the outer surface of the inner cylindrical die is cylindrical, and the diameter of the cylinder is the inner diameter of the inner panel of the composite material corrugated interlayer cylinder; the centers of two end faces of the inner cylindrical die are respectively provided with an inner die positioning structure; a positioning hoisting shaft is arranged at the center of the inner die positioning structure; a plurality of detachable structures of the inner die which are distributed in central symmetry are arranged on two end surfaces of the inner cylindrical die and around the positioning structure of the inner die;
the two positioning disks have the same structure and are flat-shaped; a positioning plate positioning structure is arranged in the center of the positioning plate, and the shape of the positioning plate positioning structure is complementary with that of the inner mold positioning structure; a plurality of positioning disc detachable structures which are distributed in a central symmetry manner are arranged on the positioning disc and around the positioning disc positioning structure corresponding to each inner mold detachable structure; a plurality of positioning cell element mould structures which are distributed in central symmetry are arranged on the positioning disc and around the detachable structure of the positioning disc;
a plurality of sets of cell element molds are arranged corresponding to each set of cell elements of the composite material corrugated interlayer cylinder body, each set of cell element mold comprises two sub-cell element molds, and the shapes of the two sub-cell element molds are respectively the same as the shapes of the inner spaces of the two sub-cell elements in the cell elements; the center of two end faces of each sub-cell element mold is respectively provided with a demolding groove; corresponding to the plurality of positioning cell element mould structures on the positioning disc, cell element mould positioning structures are respectively arranged at the centers of two ends of the plurality of corresponding sub-cell element moulds, and for the sub-cell element moulds provided with the cell element mould positioning structures, the demoulding groove is arranged at the center of the cell element mould positioning structure;
the demoulding rod is cylindrical, the end face of the top end of the demoulding rod is provided with a demoulding boss which is matched with a demoulding groove of the daughter cell element mould, and the side wall of the bottom end of the demoulding rod is provided with a positioning clamping groove which is matched and connected with a demoulding base; the upper surface of the demoulding base is complementary with the positioning clamping groove in shape and is placed on the mounting position of the demoulding machine, and the bottom end of the demoulding rod is fixed on the demoulding base through the positioning clamping groove;
respectively paving fiber prepreg on the outer side wall of the inner cylindrical mold and the outer side wall of each subcell mold, wrapping two layers of biaxially oriented polypropylene films on the paved fiber prepreg, and semi-curing; after semi-curing, removing the biaxially oriented polypropylene film wrapped on the fiber prepreg; an inner die positioning structure on one end face of the inner cylindrical die and a positioning disc positioning structure of a positioning disc are oppositely and positively arranged, the positions of the inner die detachable structure and the positioning disc detachable structure are aligned, and the mounting piece sequentially passes through the positioning disc detachable structure and the corresponding inner die detachable structure to install the positioning disc on one end face of the inner cylindrical die semi-cured with the fiber prepreg; installing the sub-cell element molds with the cell element mold positioning structures at the two ends on a positioning disc through the positioning cell element mold structures respectively; another positioning disc is installed; correspondingly installing the rest of the subcell dies semi-cured with the fiber prepreg on the outer side wall of the inner cylindrical die semi-cured with the fiber prepreg, enabling a plurality of groups of the subcell dies semi-cured with the fiber prepreg to be tightly attached to the outer side wall of the inner cylindrical die to form a ring shape, and winding two layers of biaxially oriented polypropylene films on the outer side walls of the subcell dies to perform secondary semi-curing; after semi-curing, removing the wrapped biaxially oriented polypropylene film; laying fiber prepreg on the outer side wall of a plurality of groups of cell element molds semi-cured secondarily with the fiber prepreg, wrapping two layers of biaxially oriented polypropylene films on the outer surface of the fiber prepreg, and curing; and after curing, removing the inner cylindrical die, fixing the bottom end of the demolding rod on the demolding base through the positioning clamping groove, matching the demolding boss at the top end of the demolding rod with the demolding groove of the subcell die, drawing out each subcell die, and finally removing the biaxially oriented polypropylene film to obtain the integrally molded composite material corrugated interlayer cylinder.
2. The integrated molding die for composite material corrugated sandwich cylinder according to claim 1, wherein the inner cylinder die, the positioning plate and the cell die are made of steel.
3. The integrated molding die for the composite material corrugated sandwich cylinder body according to claim 1, wherein the positioning plate positioning structure corresponds to the inner die positioning structure, the positioning plate positioning structure is a through hole, and the inner die positioning structure is a boss; or the positioning structure of the positioning plate is a boss, and the positioning structure of the inner die is a corresponding groove; the detachable structure of the inner die is an installation groove and is provided with an internal thread; the detachable structure of the positioning plate is a mounting hole and is provided with an internal thread; the mounting piece is a screw; the diameter of the detachable structure of the inner die is consistent with that of the detachable structure of the positioning disc, each mounting hole is aligned with the corresponding mounting groove, and the positioning disc is mounted on the end face of the inner cylindrical die by sequentially penetrating the mounting holes and the corresponding mounting grooves through screws; the shape of the cell element mold positioning structure is matched with that of the cell element mold positioning structure of the positioning cell element mold structure; the positioning cell element mold structure is a through hole, and the positioning cell element mold structure is a bulge; the positioning cell element mold structure is a protrusion, and the positioning cell element mold structure is a groove.
4. The integrated molding die for a composite corrugated sandwich cylindrical body of claim 1, wherein the length of each of the subcell dies is smaller than that of the cylindrical die, so that the upper and lower end faces of the subcell die do not contact with the surface of the positioning plate, and the motion of the subcell die towards the axis of the inner cylindrical die after being pressed is not hindered.
5. The integrated molding die for composite material corrugated sandwich cylinder according to claim 4, wherein the length of each sub-cell die is 1-2 mm smaller than the length of the inner cylindrical die.
6. The integrated molding mold for a composite corrugated sandwich cylinder according to claim 1, wherein the demolding groove of the daughter cell mold is formed with an internal thread, and the external surface of the demolding boss on the demolding rod is formed with an external thread to be connected with the demolding groove of the daughter cell mold.
7. A method of forming an integral forming die for a composite corrugated sandwich tubular body as claimed in claim 1, said method comprising the steps of:
1) cleaning the outer surface of the inner cylindrical die and the outer surface of each sub-cell die, then sequentially and uniformly coating a release agent on the outer surfaces, and coating a hole sealing agent on the release grooves of the sub-cell dies for hole sealing;
2) cutting the fiber prepreg according to the required size;
3) laying cut fiber prepreg on the outer side wall of the cleaned inner cylindrical die and the outer side wall of each subcell die respectively, and wrapping two layers of biaxially oriented polypropylene films on the laid fiber prepreg;
4) placing the inner cylindrical die wrapped with the biaxially oriented polypropylene film and each subcell die in an autoclave for semi-curing;
5) after semi-curing, taking the semi-cured inner cylindrical die and each subcell die out of the autoclave, cooling to room temperature, and removing the biaxially oriented polypropylene film wrapped on the fiber prepreg;
6) installing a die:
a) the method comprises the following steps that an inner die positioning structure on one end face of an inner cylindrical die and a positioning disc positioning structure of a positioning disc are oppositely and positively arranged, the position of an inner die detachable structure is aligned with that of a positioning disc detachable structure, a mounting piece sequentially passes through the positioning disc detachable structure and the inner die detachable structure, and the positioning disc is arranged on one end face of the inner cylindrical die semi-cured with fiber prepreg;
b) installing the sub-cell element molds with the cell element mold positioning structures at the two ends on a positioning disc through the positioning cell element mold structures respectively;
c) according to the method of the step a), another positioning disc is arranged at the other end of the inner cylindrical mould;
d) correspondingly placing the rest of the subcell dies semi-cured with the fiber prepreg on the outer side wall of the inner cylindrical die semi-cured with the fiber prepreg, wherein the plurality of groups of the subcell dies semi-cured with the fiber prepreg are tightly attached to the outer side wall of the inner cylindrical die by utilizing the viscosity of the surface of the fiber prepreg to form a circular ring shape;
e) winding two layers of biaxially oriented polypropylene films on the outer surface of the cell element die;
7) putting the die installed in the step 6) into the autoclave again for second semi-curing;
8) after the second semi-curing, taking the structure semi-cured for the second time in the step 7) out of the autoclave, cooling to room temperature, and removing the wrapped biaxially oriented polypropylene film;
9) laying fiber prepreg on the outer side wall of a plurality of groups of cell element molds semi-cured secondarily with the fiber prepreg, and wrapping two layers of biaxially oriented polypropylene films on the outer surface of the fiber prepreg;
10) placing the mixture in an autoclave for final curing;
11) and after curing, taking out the composite material corrugated interlayer cylinder from the autoclave, cooling to room temperature, removing the hole sealing agent in the demolding grooves of all the subcell dies, removing the inner cylindrical die, fixing the bottom end of the demolding rod on the demolding base through the positioning clamping groove, matching the demolding boss at the top end of the demolding rod with the demolding groove of the subcell die, drawing out each subcell die, removing the biaxially oriented polypropylene film, and polishing the end face to obtain the integrally-formed composite material corrugated interlayer cylinder.
8. The molding method according to claim 7, wherein in the step 4), the curing pressure in the autoclave is 1 to 2MPa, the curing temperature is 80 to 90 ℃, and the curing time is 1 to 2 hours.
9. The molding method according to claim 7, wherein in step 7), the curing pressure in the autoclave is 1 to 2MPa, the curing temperature is 80 to 90 ℃, and the curing time is 1 to 2 hours.
10. The molding method according to claim 7, wherein in the step 10), the curing pressure inside the autoclave is 2 to 3MPa, the curing temperature is 120 to 130 ℃, and the curing time is 1.5 to 2 hours.
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| CN113232323A (en) * | 2021-04-29 | 2021-08-10 | 上海新力动力设备研究所 | Mold and method for manufacturing resin-based fiber composite material wound unidirectional plate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113232323A (en) * | 2021-04-29 | 2021-08-10 | 上海新力动力设备研究所 | Mold and method for manufacturing resin-based fiber composite material wound unidirectional plate |
| CN114289270A (en) * | 2022-03-11 | 2022-04-08 | 北京理工大学 | Method for detecting and adjusting impregnation liquid level of circular tube containing epoxy resin |
| CN114289270B (en) * | 2022-03-11 | 2022-05-13 | 北京理工大学 | Method for detecting and adjusting impregnation liquid level of circular tube containing epoxy resin |
| CN117445260A (en) * | 2023-12-26 | 2024-01-26 | 天津轻快未来科技有限公司 | Forming die and forming process for net-size composite material of dense-cell product |
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