CN110341211B - Compression molding die assembly of thermoplastic composite I-shaped reinforced member - Google Patents
Compression molding die assembly of thermoplastic composite I-shaped reinforced member Download PDFInfo
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- CN110341211B CN110341211B CN201910696503.XA CN201910696503A CN110341211B CN 110341211 B CN110341211 B CN 110341211B CN 201910696503 A CN201910696503 A CN 201910696503A CN 110341211 B CN110341211 B CN 110341211B
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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
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/12—Thermoplastic materials
Abstract
The invention provides a compression molding die assembly for a thermoplastic composite material I-shaped reinforcement member, which comprises a flat plate prefabricated member die, a C-shaped prefabricated member die and an I-shaped reinforcement member die, wherein the C-shaped prefabricated member is formed by the flat plate prefabricated member through die pressing, and the die pressing can be carried out only by placing the flat plate prefabricated member in a positioning groove of the C-shaped prefabricated member die. The inclined planes with narrow top and narrow bottom are arranged on the left and right trapezoidal strips of the I-shaped reinforced member die, the inclined planes with wide top and narrow bottom are arranged on the left and right wedge blocks and matched with the inclined planes on the left and right trapezoidal blocks, and a group of attached inclined planes capable of sliding relatively are formed on the left and right sides of the inclined planes, so that downward die pressing pressure of a pressing block is converted into pressure in the horizontal direction of the pointed I-shaped reinforcing rib by the left and right trapezoidal strips, namely the single die pressing pressure in the vertical direction is converted into die pressing pressure in three directions including the downward direction and the left and right directions, equipment and process are simplified, and the die pressing die.
Description
Technical Field
The invention relates to the technical field of composite material forming, in particular to a compression molding die assembly for a thermoplastic composite material I-shaped reinforced member.
Background
The thermoplastic resin-based composite material (referred to as thermoplastic composite material for short in the application) has the advantages of good heat resistance, excellent damage tolerance, good impact resistance, short molding cycle, high production efficiency and repeated molding, and is more and more widely concerned in the aerospace field in recent years. Advanced thermoplastic composite materials represented by carbon fiber reinforced polyether ether ketone are increasingly applied to main/secondary load-bearing members in the field of aviation, but the thermoplastic composite materials are difficult to bond between adjacent layers, gaps in a laminated plate are difficult to remove and resin flow is difficult in the forming process due to high melt viscosity of a matrix, poor wettability and penetrability of thermoplastic resin to fibers and the like, so that parts of the composite materials depend on high temperature and high pressure. The existing thermosetting materials are mostly formed by hot-pressing and curing by an autoclave, the safe working temperature and the safe pressure of the common autoclave are respectively below 250 ℃ and below 1Mpa, and the temperature and the pressure can meet the forming requirement of the thermosetting materials. The molding temperature and pressure of the thermoplastic material such as carbon fiber reinforced polyetheretherketone are above 300 ℃ and above 1Mpa respectively, so the existing thermoplastic materials mostly adopt a compression molding process.
The existing thermoplastic composite material member mostly adopts a method of one-time mould pressing or two-time mould pressing: the one-time compression molding technology is suitable for molding of flat plate pieces, and when the one-time compression molding technology is applied to molding of structural parts, the problems that the surfaces of the pieces are not flat, resin is not uniformly distributed, the mechanical property cannot be guaranteed and the like can be caused. The secondary hot pressing adopts a method of die assembly molding of a female die and a male die, can only carry out one-way pressure transmission (generally in the vertical direction), and is only suitable for molding simple structural members in a C shape, an L shape and the like, namely, a flat plate member is preformed firstly, and then the flat plate member is softened at high temperature to carry out secondary consolidation molding. However, for the complex components commonly used in the aviation field such as the I-shaped reinforcing rib, the one-way pressure transmission molds such as the female mold and the male mold used in the primary and secondary hot press molding process are not suitable for the complex components with the I-shaped reinforcing rib in structure and mold closing methods any more, and in the prior art, a mold pressing mold special for the thermoplastic composite material I-shaped reinforcing rib component is not provided. Chinese patent 201710401959.X discloses a composite material i-shaped stringer molding process, and from the specification thereof, it is known that a hot press curing mold and a curing process for thermosetting materials performed in an autoclave are provided. The autoclave forms uniform pressure on the composite material by using the pressure of the filled gas, so that the autoclave can easily realize the molding of the I-shaped stringer of the composite material, but the autoclave equipment is expensive, the molding cost is high, the molding process is complex, time and labor are wasted, and the industrialization requirement is difficult to meet. Therefore, in the prior art, an economical, rapid and reliable forming scheme which does not need to use an autoclave and is suitable for the thermoplastic composite material H-shaped reinforcing rib component is needed, so that the thermoplastic composite material H-shaped reinforcing rib component is helped to move to an industrialized road, and the development of aerospace industry in China is promoted.
Disclosure of Invention
The invention aims to provide a compression molding die assembly of a thermoplastic composite I-shaped reinforcement member, which aims to solve the problems in the background technology.
A compression molding die assembly of a thermoplastic composite material I-shaped reinforcement member comprises a flat plate prefabricated member die, a C-shaped prefabricated member die and an I-shaped reinforcement member die, wherein the flat plate prefabricated member die is used for pressing a thermoplastic composite material prepreg into a flat plate prefabricated member, the C-shaped prefabricated member die is used for pressing the flat plate prefabricated member into the C-shaped prefabricated member, the I-shaped reinforcement member die can be at least used for pressing an upper edge block, a lower edge block, an upper filling block, a lower filling block, a left side C-shaped prefabricated member and a right side C-shaped prefabricated member into an I-shaped reinforcement rib together, the upper edge block and the lower edge block are arranged in parallel up and down, the left side C-shaped prefabricated member and the right side C-shaped prefabricated member for pressing the I-shaped reinforcement rib are arranged between the upper edge block and the lower edge block and back to back, the upper filling block is arranged in a triangular area surrounded, the lower filling block is arranged in a triangular area surrounded by the lower edge block and the two C-shaped prefabricated members, and the left C-shaped prefabricated member and the right C-shaped prefabricated member are both formed by pressing the flat prefabricated members through the C-shaped prefabricated member die.
The I-shaped reinforcement member die comprises a base and an upper die set arranged on the base, wherein the upper die set comprises a left trapezoid strip, a right trapezoid strip, a left wedge block, a right wedge block and a pressing block, the right side wall of the left trapezoid strip is provided with a left forming surface matched with the front groove shape of the left C-shaped prefabricated member, the left side wall of the right trapezoid strip is provided with a right forming surface matched with the front groove shape of the right C-shaped prefabricated member, the left side wall of the left trapezoid strip and the right side wall of the right trapezoid strip are both provided with inclined surfaces, and the inclined directions of the inclined surfaces are set to ensure that the upper end of an area, corresponding to the inclined surfaces, of the left trapezoid strip and the right trapezoid strip is a narrow; the pressing block is used for transmitting downward die pressing pressure provided by an external pressure mechanism to the left and right trapezoidal strips, the left wedge block and the right wedge block are respectively and fixedly arranged at the left and right edge positions of the bottom surface of the pressing plate, the inner side wall of the left wedge block is arranged to be an inclined surface structure matched with the inclined surface on the left trapezoidal block, and the inner side wall of the right wedge block is also arranged to be an inclined surface structure matched with the inclined surface on the right trapezoidal block; the inclined plane structure between the left wedge block, the right wedge block and the left trapezoid strip enables a part of downward molding pressure of the pressing block to be converted into pressure pointing to the horizontal direction of the I-shaped reinforcing rib by the left trapezoid strip and the right trapezoid strip, namely the molding pressure in a single vertical direction is converted into molding pressure in three directions including a downward direction and a left direction and a right direction.
The inclination angle of the inclined plane of the left and right trapezoidal strips is 65-85 degrees, namely the included angle between the inclined plane of the left and right trapezoidal strips and the bottom surface is 65-85 degrees.
Further, the vertical dimension of the left and right wedges is set to satisfy the following condition: when the briquetting was located the mould pressing stroke terminal, promptly the briquetting was located the terminal of downward displacement stroke, the bottom surface of controlling trapezoidal strip just offsets with the bearing surface of base, and the briquetting bottom surface is located the middle zone between left voussoir and the right voussoir and also just offsets with controlling trapezoidal strip top surface, at this moment, still has the clearance or did not reach the state that offsets between the bottom surface of controlling the voussoir and the bearing surface of base to voussoir bottom influences the mould pressing process about preventing.
Furthermore, the middle area of the bottom surface of the pressing block is provided with a left abdicating groove and a right abdicating groove at the positions close to the left wedge block and the right wedge block respectively, and the left abdicating groove and the right abdicating groove are used for preventing the condition that the mould pressing is not in place due to the uneven bottom surface of the pressing block.
Furthermore, the I-shaped reinforced member mold is also used for integrally pressing the main body wall plate, the lower edge block, the two C-shaped prefabricated members arranged back to back and the upper edge block into the I-shaped reinforced member, a groove for placing part or all of the main body wall plate is concavely arranged on the pressure bearing surface of the base, the transverse size of the groove is not more than the transverse size of the left trapezoidal strip and the right trapezoidal strip, the depth of the groove is less than or equal to the thickness of the main body wall plate, so that the top surface of the main body wall plate placed in the groove is higher than or equal to the height of the pressure bearing surface of the base, and the main body wall plate and the I-shaped reinforced rib are.
Furthermore, the left edge and the right edge of the base are respectively provided with a left baffle and a right baffle which are used for limiting the pressing block and the left wedge block and the right wedge block, and the left baffle and the right baffle are used for preventing the pressing block and the left wedge block and the right wedge block from transversely moving in the die pressing process, so that the relative position between the I-shaped reinforcing rib and the main body wall plate is accurately ensured.
Furthermore, the main body wall plate is provided with a plurality of I-shaped reinforcing ribs in a connecting manner, correspondingly, a plurality of groups of upper modules are arranged on the base, and each group of upper modules corresponds to one I-shaped reinforcing rib.
Further, the flat plate prefabricated part mould comprises an upper mould block and a lower mould block, and the bottom surface of the upper mould block and the top surface of the lower mould block are both flat molded surfaces used for pressing the prepreg.
Furthermore, the C-shaped prefabricated part mold comprises an upper male mold and a lower female mold, wherein a positioning groove for positioning and placing the flat prefabricated part is formed in the female mold, a concave cavity for pressing the flat prefabricated part into the bent C-shaped prefabricated part is formed in the bottom of the positioning groove, a convex part extending downwards is arranged on the male mold, and a molded surface which is the same as the front groove shape of the C-shaped prefabricated part to be finally obtained is arranged on the convex part.
Preferably, the I-shaped reinforcing ribs and the main body wall plate are both made of thermoplastic resin matrix composite materials, fiber reinforced materials in the thermoplastic resin matrix composite materials are carbon fibers or glass fibers, resin matrix in the thermoplastic resin matrix composite materials is made of polypropylene (PP), polyether ether ketone (PEEK) or polyphenylene sulfide (PPS) and other resins, and the compression molding die is made of hard metal materials.
Specifically, the following description is provided: the thermoplastic composite materials are short for thermoplastic resin matrix composite materials, the mould has universality for the thermoplastic resin matrix composite materials, and the resin matrix provided by the invention is not limited to the three thermoplastic composite materials of polypropylene (PP), polyether ether ketone (PEEK) or polyphenylene sulfide (PPS).
The invention has at least the following beneficial effects:
the invention provides a compression molding die assembly of a thermoplastic composite I-shaped reinforced component, which comprises a flat plate prefabricated part die, a C-shaped prefabricated part die and an I-shaped reinforced component die, wherein the flat plate prefabricated part die is used for pressing a thermoplastic composite prepreg into a flat plate prefabricated part, the C-shaped prefabricated part die is used for pressing the flat plate prefabricated part into a C-shaped prefabricated part, the I-shaped reinforced component die is used for pressing two C-shaped prefabricated parts arranged back to back into an I-shaped reinforced rib, and the I-shaped reinforced component die comprises a base and one or more groups of upper die sets arranged on the base.
In the invention, the C-shaped prefabricated member is formed by die pressing the flat prefabricated member, and the die pressing can be carried out only by placing the flat prefabricated member in the positioning groove of the C-shaped prefabricated member die.
An inclined surface is arranged in an upper module of the I-shaped reinforcement component mould, inclined surfaces with narrow top and wide bottom are arranged on the left wedge block and the right wedge block, inclined surfaces with wide top and narrow bottom are arranged on the left trapezoid block and the right trapezoid block and are matched with the inclined surfaces on the left wedge block and the right wedge block, the left side and the right side respectively form a group of attached inclined surfaces which can slide relatively, so that the downward mould pressing pressure of the pressing block is converted into the pressure pointing to the horizontal direction of the I-shaped reinforcing rib by the left trapezoidal strip and the right trapezoidal strip, namely, the single molding pressure in the vertical direction is converted into the molding pressure in three directions of downward addition and left and right directions, thereby the mould pressing pressure in the horizontal direction is not needed to be additionally arranged, the equipment and the process are simplified, the whole upper mould set and the base can be placed between the upper mould plate and the lower mould plate of the flat vulcanizing machine, and the heating system of the vulcanizing press is used for heating and warming, the vacuumizing is not needed, the production is economical, rapid and reliable, and the mass production of products with I-shaped reinforcing ribs is promoted.
The invention overcomes the problems of uneven thickness and high porosity of the member caused by the incapability of multi-directional pressure transmission and difficult pressure transmission of complex member forming in the existing mould pressing process, thereby realizing the low-cost manufacture of the I-shaped reinforced member and laying a foundation for the application of advanced thermoplastic resin matrix composite materials in the aviation field.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is an exploded cross-sectional view of an I-shaped stiffener and body panel to be molded with a die assembly in accordance with a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional structural view of a flat preform mold according to a preferred embodiment of the present invention;
FIG. 3 is a cross-sectional cut-away structural view of a C-shaped preform mold of a preferred embodiment of the present invention;
FIG. 4 is a cross-sectional exploded view of a form of the I-shaped reinforcement member of the first preferred embodiment of the present invention (corresponding to the main wall plate having only one I-shaped reinforcement);
FIG. 5 is a cross-sectional view of the components of the form for forming a reinforcement member according to the preferred embodiment of the present invention at the end of the forming stroke when the main wall panel has only one I-shaped reinforcing bar;
fig. 6 is a cross-sectional structural view of the parts of the form for an i-shaped reinforcing member of the present invention at the end of the molding stroke when the main body wall plate has two i-shaped reinforcing bars.
In the figure: 1-flat prefabricated part mould, 10-flat prefabricated part, 11-upper mould, 12-lower mould, 2-C shaped prefabricated part mould, 20-C shaped prefabricated part, 21-top edge, 22-bottom edge, 23-male mould, 231-convex part, 24-female mould, 25-positioning groove, 26-concave cavity, 261-round chamfer, 3-I-shaped reinforced component mould, 31-base, 311-bearing surface, 312-groove, 313-left baffle, 314-right baffle, 32-left trapezoidal strip, 321-left forming surface, 322-left inclined surface, 33-right trapezoidal strip, 331-right forming surface, 332-right inclined surface, 34-left wedge block, 35-right wedge block, 36-pressing block, 361-left abdicating groove, 362-right abdicating groove, 4-I-shaped reinforcing rib, 41-upper edge block, 42-lower edge block, 43-left side C-shaped prefabricated member, 44-right side C-shaped prefabricated member, 45-upper filling block, 46-lower filling block, 5-top groove, 6-bottom groove and 7-main body wall plate.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Referring to the i-shaped reinforcing rib shown in fig. 1 and the compression molding die assembly for the thermoplastic composite I-shaped reinforcing member shown in fig. 2 to 6, the compression molding die assembly comprises a flat plate preform die 1, a C-shaped preform die 2 and an I-shaped reinforcing member die 3, the flat plate preform die is used for pressing a plurality of thermoplastic composite prepreg sheets which are stacked together into a flat plate preform 10, the C-shaped preform die is used for pressing the flat plate preform 10 into a C-shaped preform 20, in this embodiment, the C-shaped preform 20 comprises a left C-shaped preform 43 and a right C-shaped preform 44, the I-shaped reinforcing member die 3 is used for pressing an upper edge block 41, a lower edge block 42, an upper filling block 45, a lower filling block 46, the left C-shaped preform 43 and the right C-shaped preform 44 together into an i-shaped reinforcing rib 4, and the upper edge block and the lower edge block, the upper edge block and the lower edge block can be thermoplastic composite prepreg sheets or thermoplastic composite prefabricated members, the left side C-shaped prefabricated member and the right side C-shaped prefabricated member for pressing the I-shaped reinforcing rib are arranged between the upper edge block and the lower edge block and symmetrically arranged back to back, and the back direction of the C-shaped prefabricated member is the side opposite to the vertical groove surface of the C-shaped prefabricated member as shown in figure 3. The upper filling block is arranged in a triangular area surrounded by the upper edge block and the two C-shaped prefabricated components, the lower filling block is arranged in a triangular area surrounded by the lower edge block and the two C-shaped prefabricated components, the upper filling block and the lower filling block can be formed by stacking prepreg filaments and/or prepreg strips, and the prepreg filaments and/or prepreg strips can be molded into prefabricated components to be used as the upper filling block and the lower filling block.
In this embodiment, the i-shaped reinforcement member mold 3 includes a base 31 and an upper mold set arranged on the base, the upper mold set includes a left trapezoidal strip 32, a right trapezoidal strip 33, a left wedge 34, a right wedge 35 and a pressing block 36, the right side wall of the left trapezoidal strip is provided with a left molding surface 321 matched with the front groove shape of the left C-shaped prefabricated member, the left side wall of the right trapezoidal strip is provided with a right molding surface 331 matched with the front groove shape of the right C-shaped prefabricated member, the left side wall of the left trapezoidal strip and the right side wall of the right trapezoidal strip are respectively provided with a left inclined surface 322 and a right inclined surface 332, the inclined directions of the inclined surfaces are set so that the upper end of the region of the inclined surface corresponding to the left trapezoidal strip and the right trapezoidal strip is a narrow end, and the; the pressing block is used for transmitting downward die pressing pressure provided by an external pressure mechanism to the left and right trapezoid strips, the external press machine can be a flat vulcanizing machine, the I-shaped reinforcement component die is placed between an upper die plate and a lower die plate of the flat vulcanizing machine, die pressing can be carried out, the flat prefabricated part die 1 and the C-shaped prefabricated part die 2 can also be subjected to die pressing by the flat vulcanizing machine, the left wedge block and the right wedge block are respectively and fixedly arranged at the left edge and the right edge of the bottom surface of the pressing plate, the left wedge block and the right wedge block are symmetrical about the transverse symmetrical center of the pressing block, the inner side wall of the left wedge block is arranged to be of an inclined surface structure matched with the left inclined surface, and the inner side wall of the right wedge; the inclined plane structure between the left wedge block, the right wedge block and the left trapezoid strip enables a part of downward molding pressure of the pressing block to be converted into pressure pointing to the horizontal direction of the I-shaped reinforcing rib by the left trapezoid strip and the right trapezoid strip, namely the molding pressure in a single vertical direction is converted into molding pressure in three directions including a downward direction and a left direction and a right direction.
In this embodiment, the inclination angles of the left inclined plane are all 80 °, that is, the included angle between the left and right inclined planes and the bottom surfaces (also horizontal planes) of the left and right trapezoidal bars is equal to 80 °.
In this embodiment, the vertical height of the left and right trapezoidal strips is equal to the target height of the finally obtained i-shaped reinforcing rib, the left and right C-shaped prefabricated members are arranged back to back in an abutting mode through the left and right trapezoidal strips, the left and right trapezoidal strips can surround and form an upward opening top groove 5 at the top positions of the left and right forming surfaces, and surround and form a downward opening bottom groove 6 at the bottom positions of the left and right forming surfaces, the depth of the top groove is greater than the thickness of the top edge 21 of the left and right C-shaped prefabricated members, and the depth of the bottom groove is greater than the thickness of the bottom edge 22 of the left and right C-shaped prefabricated members, so that the upper edge block and the lower edge block can be placed and positioned in the top groove and the bottom groove respectively, and.
In this embodiment, the left vertical face 323 is continuously arranged at the tail end of the left inclined face at the bottom of the left trapezoidal strip, the left vertical face 333 is continuously arranged at the tail end of the right inclined face at the bottom of the right trapezoidal strip, on one hand, the vertical face can prevent the situation that the left trapezoidal strip bottom and the right wedge block bottom interfere with each other or the die pressing is not in place due to size errors when the pressing block is located at the die pressing stroke end point, on the other hand, the transverse size of the left trapezoidal strip and the transverse size of the right trapezoidal strip can be reduced, the space occupation is reduced, and the pre-assembly of the.
In this embodiment, the middle area of the bottom surface of the pressing block is provided with a left abdicating groove 361 and a right abdicating groove 362 at positions close to the left and right wedges, respectively, and the left abdicating groove and the right abdicating groove are used for preventing the sliding guide of the left and right inclined surfaces to the left and right wedges from being affected due to the uneven bottom surface of the pressing block, so as to facilitate better conversion and transfer of the molding pressure.
In this embodiment, the pressure-bearing surface 311 of the base is concavely provided with a groove 312 for placing part or all of the main body wall panels 7, the transverse dimension of the groove is not more than the transverse dimension of the left and right trapezoidal strips, and the depth of the groove is less than or equal to the thickness of the main body wall panel 7, so that the top surface of the main body wall panel placed in the groove is higher than or equal to the height of the pressure-bearing surface of the base, thereby facilitating the integration of the main body wall panel and the i-shaped reinforcing rib in the molding process. The main body wall plate refers to a skin prefabricated member of a main body (the main body can be an airplane wing shell or other small-sized components) to be installed and served by an I-shaped reinforcing rib formed by pre-pressing a composite material prepreg. When the main body wallboard ruler is small in transverse dimension, the wallboard used for being combined with the I-shaped reinforcing ribs can be formed by laminating a plurality of layers of fiber reinforced composite material prepreg blocks.
In this embodiment, the vertical dimensions of the left and right wedges are set to satisfy the following conditions: when the briquetting was located the mould pressing stroke terminal, promptly the briquetting was located the terminal of downward displacement stroke, the bottom surface of controlling trapezoidal strip just offsets with the bearing surface of base, and the briquetting bottom surface is located the middle zone between left voussoir and the right voussoir and also just offsets with controlling trapezoidal strip top surface, at this moment, still has the clearance or did not reach the state that offsets between the bottom surface of controlling the voussoir and the bearing surface of base to voussoir bottom influences the mould pressing process about preventing.
In this embodiment, the left side wall of briquetting, right side wall constitute a plane with the lateral wall of left voussoir, the lateral wall of right voussoir jointly respectively, limit portion is provided with respectively and is used for carrying on spacing left baffle 313 and right baffle 314 to the briquetting about with the voussoir about with about, the inside wall of left baffle and right baffle is flat plane and inside wall parallel arrangement between them, the lateral width of briquetting equals about the lateral distance between the baffle, and the inside wall of left baffle pastes with the outside wall of left voussoir, the inside wall of right baffle pastes with the outside wall of right voussoir, left side baffle and right baffle are used for preventing that the briquetting from taking place horizontal migration with about with the voussoir in the mould pressing process to the relative position between accurate assurance I-shaped strengthening rib and the main part wallboard.
Referring to fig. 6, in another form of the i-shaped reinforcement member mold of the present invention, the main wall plate is provided with two i-shaped reinforcement ribs, and correspondingly, the base is provided with two sets of upper mold blocks, each set of upper mold block corresponds to one i-shaped reinforcement rib, the press blocks of the two sets of upper mold blocks are integrally arranged, and the left and right wedge blocks at the adjacent positions of the two sets of upper mold blocks are also integrally arranged.
Referring to fig. 2, in this embodiment, the flat preform mold 1 includes an upper mold block 11 and a lower mold block 12, a bottom surface of the upper mold block and a top surface of the lower mold block are flat surfaces for applying pressure to the thermoplastic composite prepreg, the top surface of the upper mold block and the bottom surface of the lower mold block are flat surfaces for being attached to an upper mold plate and a lower mold plate of a flat vulcanizing machine, so as to transfer heat and molding pressure, and the thermoplastic composite prepreg is pressed by the flat preform mold on the flat vulcanizing machine to obtain the flat preform 10.
Referring to fig. 3, in the present embodiment, the C-shaped preform mold 2 includes an upper male mold 23 and a lower female mold 24, the female mold is provided with a positioning groove 25 for positioning and placing the flat preform 10, a side wall of the positioning groove matches with an outer contour of the flat preform to perform a good positioning function on the flat preform, thereby, no additional positioning component is needed, the operation is simple and convenient, the groove bottom of the positioning groove is provided with the concave cavity 26, the bottom surface of the concave cavity is provided with the first molded surface with the same profile as the back profile of the C-shaped prefabricated member to be finally obtained, the male die is provided with a convex part 231 which extends downwards and is matched with the concave cavity, the convex part is provided with a molded surface II which is the same as the front groove shape of the C-shaped prefabricated part to be finally obtained, under the temperature and pressure provided by the flat vulcanizing machine, the straight flat prefabricated member is formed into a C-shaped prefabricated member under the combined action of the convex part and the concave cavity. The position of the cavity is determined according to the structure of the C-shaped preform to be obtained, and the cavity is closer to the right side wall of the positioning groove in the transverse direction, see fig. 3, so that the shorter side of the C-shaped preform to be laid flat is located on the right. In this embodiment, the corner at the top of the sidewall of the cavity and the intersection of the positioning grooves is provided with a round chamfer 261 for bending the flat plate preform.
In this embodiment, the upper edge block, the lower edge block, the upper filling block, the lower filling block, the i-shaped reinforcing rib and the main wall plate are all made of a thermoplastic resin matrix composite material of carbon fiber reinforced polyetheretherketone.
In this embodiment, the compression molding process of the i-shaped reinforcement member substantially includes the following steps:
s1) making a flat plate preform: and (3) pressing the thermoplastic composite material prepreg which is laminated together and cut in advance into a flat plate prefabricated member in a mould pressing mode.
The ideal molding temperature of the carbon fiber reinforced polyether-ether-ketone composite material is 370-410 ℃, the single-layer thickness of the prepreg is 0.14mm, the number of layers of the prepreg is calculated according to the single-layer thickness and the target molding thickness, and then the first compression molding can be carried out to obtain the flat plate prefabricated member. Calculating the size of the flat plate preform to be preformed according to the size of the I-shaped reinforcing ribs 4, cutting a certain amount of prepreg sheets, and setting a flat plate preform mold as shown in FIG. 2. In order to reduce the influence of high-temperature repeated molding on the performance of the composite material as much as possible, the temperature of the first compression molding is 370-380 ℃, the applied pressure is 1-4 MPa, the heat preservation time is 10-30 min, and the pressure maintaining time is 50-60 min.
S2) making a C-shaped preform: and (4) bending the flat plate preform obtained in the step S1 into a C-shaped preform by means of die pressing.
And performing secondary die pressing prefabrication and forming after the flat plate prefabricated part is subjected to die pressing forming to obtain a C-shaped prefabricated part, wherein a forming die is shown in figure 3. In order to reduce the influence of high-temperature repeated molding on the performance of the finished piece as much as possible, the temperature of the second compression molding is 370-380 ℃, and the heat preservation time is 10-30 min. In order to avoid uneven thickness of a workpiece caused by glue overflow in the forming process with overlarge pressure, the forming pressure is 1 MPa-2 MPa, and the pressure maintaining time is 50-60 min.
S3) manufacturing the I-shaped reinforcement member: taking two C-shaped prefabricated members prepared in the step S2, cutting and laminating a thermoplastic composite material prepreg as a raw material of an upper edge block and a lower edge block of the I-shaped reinforcing rib, taking another prepreg sheet and cutting the prepreg sheet into filaments for serving as an upper filling block and a lower filling block, arranging the two C-shaped prefabricated members back to back, defining a left C-shaped prefabricated member with a leftward notch, defining a right C-shaped prefabricated member with a rightward notch, sequentially placing a main body wall plate, the lower edge block prepreg, the lower filling block prepreg, the two C-shaped prefabricated members arranged back to back, the upper filling block prepreg and the upper edge block prepreg in an I-shaped reinforcing member mold from bottom to top, and integrally pressing the main body wall plate, the lower edge block prepreg, the lower filling block prepreg, the two C-shaped prefabricated parts arranged back to back, the upper filling block prepreg and the upper edge block prepreg into the I-shaped reinforced member in a mould pressing mode.
And (3) forming the I-shaped reinforced member after prefabricating a pair of C-shaped prefabricated members, wherein the pre-laying mode is shown in figure 1, and the rest parts except the two C-shaped prefabricated members are directly laid by using prepreg. According to the process requirements, the molded part is required to be simultaneously pressed in the horizontal direction and the vertical direction to ensure the molding quality, and most of the existing presses can only provide one-way pressure (generally in the vertical direction), so that the I-shaped reinforcement member mold is designed, the mold is placed on the press to be pressed longitudinally, the molded part can be simultaneously pressed transversely under the extrusion action of the wedge blocks and the trapezoidal strips, in the specific molding process, after the prepreg laying is finished, the molded part and the mold are simultaneously heated to 390-410 ℃, then the pressure is applied to 3-5 MPa, the temperature is kept for 20-40 min, and the pressure is kept for 50-70 min. And (5) demolding after the mold is cooled to room temperature, and finishing the preparation of the I-shaped reinforcement member made of the thermoplastic composite material.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A compression molding die assembly of a thermoplastic composite material I-shaped reinforcement member is characterized by comprising a flat plate prefabricated member die (1), a C-shaped prefabricated member die (2) and an I-shaped reinforcement member die (3), wherein the flat plate prefabricated member die is used for pressing a thermoplastic composite material prepreg into a flat plate prefabricated member (10), the C-shaped prefabricated member die is used for pressing the flat plate prefabricated member into a C-shaped prefabricated member, the I-shaped reinforcement member die at least can be used for pressing an upper edge block (41), a lower edge block (42), an upper filling block (45), a lower filling block (46), a left C-shaped prefabricated member (43) and a right C-shaped prefabricated member (44) into an I-shaped reinforcement rib together, the upper edge block and the lower edge block for pressing the I-shaped reinforcement rib are arranged in parallel from top to bottom, and the left C-shaped prefabricated member and the right C-shaped prefabricated member for pressing the I-shaped reinforcement rib are arranged, the upper filling block is arranged in a triangular area defined by the upper edge block and the two C-shaped prefabricated members, and the lower filling block is arranged in a triangular area defined by the lower edge block and the two C-shaped prefabricated members;
the I-shaped reinforcement member die comprises a base (31) and an upper die set arranged on the base, wherein the upper die set comprises a left trapezoid strip (32), a right trapezoid strip (33), a left wedge block (34), a right wedge block (35) and a pressing block (36), the right side wall of the left trapezoid strip is provided with a left forming surface (321) matched with the front groove shape of a left C-shaped prefabricated member, the left side wall of the right trapezoid strip is provided with a right forming surface (331) matched with the front groove shape of a right C-shaped prefabricated member, the left side wall of the left trapezoid strip and the right side wall of the right trapezoid strip are both provided with inclined surfaces (322/332), the inclined directions of the inclined surfaces are set to enable the upper end of an area, corresponding to the inclined surfaces, of the left trapezoid strip and the right trapezoid strip to be; the pressing block is used for transmitting downward die pressing pressure provided by an external pressure mechanism to the left and right trapezoidal strips, the left wedge block and the right wedge block are respectively and fixedly arranged at the left and right edge positions of the bottom surface of the pressing plate, the inner side wall of the left wedge block is arranged to be an inclined surface structure matched with the inclined surface on the left trapezoidal block, and the inner side wall of the right wedge block is also arranged to be an inclined surface structure matched with the inclined surface on the right trapezoidal block; the inclined plane structure between the left wedge block, the right wedge block and the left trapezoid strip enables a part of downward molding pressure of the pressing block to be converted into pressure pointing to the horizontal direction of the I-shaped reinforcing rib by the left trapezoid strip and the right trapezoid strip, namely the molding pressure in a single vertical direction is converted into molding pressure in three directions including a downward direction and a left direction and a right direction.
2. The compression molding die assembly for the thermoplastic composite I-shaped reinforcement member as claimed in claim 1, wherein the inclined planes of the left and right trapezoidal bars are inclined at an angle of 65-85 °, and the vertical dimensions of the left and right wedges are set to satisfy the following conditions: when the briquetting was located the mould pressing stroke terminal, promptly the briquetting was located the terminal of downward displacement stroke, the bottom surface of controlling trapezoidal strip just offsets with pressure-bearing surface (311) of base, and the briquetting bottom surface is located the middle zone between left voussoir and the right voussoir and also just offsets with controlling trapezoidal strip top surface, and at this moment, still there is the clearance or did not reach the state that offsets between the bottom surface of controlling the voussoir and the pressure-bearing surface of base to prevent about voussoir bottom influence mould pressing process.
3. The compression molding die assembly for the thermoplastic composite I-shaped reinforcement member as claimed in claim 1, wherein the middle area of the bottom surface of the pressing block is provided with a left abdicating groove (361) and a right abdicating groove (362) at positions close to the left and right wedges, respectively, and the left abdicating groove and the right abdicating groove are used for preventing the situation that the compression molding is not in place due to the uneven bottom surface of the pressing block.
4. The mold assembly of claim 1, wherein the mold assembly is further used for integrally pressing the main wall plate (7), the lower edge block, the two C-shaped prefabricated members arranged back to back and the upper edge block into the form reinforcement member, the pressure-bearing surface of the base is provided with a concave groove (312) for placing part or all of the main wall plate (7), the transverse dimension of the concave groove does not exceed the transverse dimension of the left and right trapezoidal bars, and the depth of the concave groove is less than or equal to the thickness of the main wall plate, so that the top surface of the main wall plate placed in the concave groove is higher than or equal to the height of the pressure-bearing surface of the base, thereby facilitating the integration of the main wall plate and the i-shaped reinforcement rib in the mold pressing process.
5. The mold assembly for molding a thermoplastic composite i-shaped reinforcement member according to claim 1, wherein the left and right side portions of the base are provided with left and right stoppers (313, 314) for limiting the position of the press block and the left and right wedges, respectively, and the left and right stoppers are used for preventing the press block and the left and right wedges from moving laterally during the molding process, thereby accurately ensuring the relative positions of the i-shaped reinforcement member and the main wall.
6. The assembly of claim 5, wherein the main wall is provided with a plurality of I-shaped reinforcing ribs, and correspondingly, the base is provided with a plurality of sets of upper die sets, and each set of upper die set corresponds to one I-shaped reinforcing rib.
7. A compression moulding mould assembly for a thermoplastic composite i-shaped reinforced member according to any one of claims 1 to 6, wherein the flat plate preform mould comprises an upper mould block (11) and a lower mould block (12), and the bottom surface of the upper mould block and the top surface of the lower mould block are both flat profiles for pressing prepregs.
8. A compression moulding mould assembly for a thermoplastic composite i-shaped ribbed component according to any one of claims 1 to 6, characterised in that the C-shaped preform mould comprises an upper male mould (23) and a lower female mould (24), the female mould is provided with a positioning groove (25) for positioning and placing a flat preform, the bottom of the positioning groove is provided with a cavity (26) for pressing the flat preform into a curved C-shaped preform, the male mould is provided with a downwardly projecting protrusion (231), and the protrusion is provided with a profile having the same groove shape as the front surface of the finally obtained C-shaped preform.
9. The compression molding die assembly for the I-shaped reinforcement member made of the thermoplastic composite material as claimed in claim 8, wherein the I-shaped reinforcement rib and the main wall plate are both made of a thermoplastic resin-based composite material, the fiber reinforcement material in the thermoplastic resin-based composite material is carbon fiber or glass fiber, the resin matrix in the thermoplastic resin-based composite material is polypropylene, polyether ether ketone or polyphenylene sulfide, and the compression molding die is made of a hard metal material.
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| PCT/CN2020/103851 WO2021018002A1 (en) | 2019-07-30 | 2020-07-23 | Compression molding mold assembly and method for i-shaped reinforcement member of thermoplastic composite material |
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| CN111016385B (en) * | 2019-12-09 | 2022-06-17 | 宁波远景汽车零部件有限公司 | Method for wrapping spare tire cover plate of automobile trunk |
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