CN111844810A - Compression molding mechanism and molding method for composite prepreg laminated board - Google Patents
Compression molding mechanism and molding method for composite prepreg laminated board Download PDFInfo
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- CN111844810A CN111844810A CN202010600599.8A CN202010600599A CN111844810A CN 111844810 A CN111844810 A CN 111844810A CN 202010600599 A CN202010600599 A CN 202010600599A CN 111844810 A CN111844810 A CN 111844810A
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- prepreg
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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
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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
- 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
- B29C70/545—Perforating, cutting or machining during or after moulding
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- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a compression molding mechanism and a compression molding method for a composite prepreg laminated board, and belongs to the technical field of compression molding, curing and molding of thermosetting and thermoplastic composite laminated boards. The compression molding mechanism for the composite material prepreg laminated board comprises a fixed frame and an elastic frame; the fixed frame is arranged at the lower part of the press head of the punching machine, and the elastic frame is arranged in the fixed frame; the outer side end of the elastic frame is connected with the fixed frame, and the inner side end of the elastic frame is used for connecting the prepreg prefabricated body. The technical problem of the prior art that the position of the prepreg is not fixed firmly, and when a punch press is used for punch forming of the prepreg, a compression area of the prepreg is prone to wrinkling, so that products are scrapped is solved. The invention utilizes the elastic frame to maintain the tension, adjusts the tension applied to the prepreg and the tension angle during molding, ensures no wrinkling after molding and has high product qualification rate.
Description
Technical Field
The invention relates to the technical field of mould pressing, curing and forming of thermosetting and thermoplastic composite laminated plates, in particular to a mould pressing forming mechanism and a mould pressing forming method of a composite prepreg laminated plate suitable for sheet metal section prepreg.
Background
The compression molding of the composite material has the advantages of high production speed and good product consistency. In the forming process of the composite material, the prepreg needs to be directly placed at the lower part of a pressing head of a punching machine, and after the punching machine is started, the pressing head directly performs punch forming on the prepreg at the lower part.
In the prior art, the position of the prepreg is not fixed firmly, and when the speed of a press head of a stamping machine is not matched, the stamping deformation of the prepreg is very easy to cause, so that the compression area of the prepreg wrinkles, especially the edge area of a large corner and a formed part is almost inevitable, and the problems of high product rejection rate and low production efficiency are solved. And the adoption of the stamping forming method has low working efficiency.
Disclosure of Invention
The invention aims to provide a compression molding mechanism for a composite material prepreg laminated board, which aims to solve the technical problems that in the prior art, the position of a prepreg is not firmly fixed, and when a punching head of a punching machine performs punching molding on the prepreg, a compression area of the prepreg is easy to wrinkle, so that products are scrapped.
The invention provides a compression molding mechanism for a composite material prepreg laminated board, which comprises a fixed frame and an elastic frame;
The fixed frame is arranged at the lower part of the press head of the punching machine, and the elastic frame is arranged in the fixed frame;
the outer side end of the elastic frame is connected with the fixed frame, and the inner side end of the elastic frame is used for connecting the prepreg prefabricated body.
Furthermore, the fixing frame comprises a first connecting rod and a second connecting rod;
the number of the first connecting rods is at least two, and the number of the second connecting rods is at least two;
a first connecting rod and a second connecting rod are connected in a cross mode and are connected to form a frame body structure with an inner accommodating space, and the elastic frame is arranged in the inner accommodating space.
Furthermore, a first connecting hole is formed in the first connecting rod, and a second connecting hole is formed in the second connecting rod;
the first connecting hole is connected with the second connecting hole through the first locking piece, and the first connecting rod is connected with the second connecting rod.
Furthermore, the number of the first connecting holes is multiple, and the number of the second connecting holes is multiple.
Further, the elastic frame comprises a first elastic connecting piece and a second elastic connecting piece;
the outer side end of the first elastic connecting piece is connected with the first connecting rod, and the inner side end of the first elastic connecting piece is connected with the first clamping block of the prepreg preform; the outer side end of the second elastic connecting piece is connected with the second connecting rod, and the inner side end of the second elastic connecting piece is connected with the second clamping block of the prepreg preform;
The structure of the first elastic connecting piece is the same as that of the second elastic connecting piece.
Furthermore, the first elastic connecting piece comprises a fixing piece, an elastic piece and a clamping piece;
the outside end of mounting is connected on the head rod, and the outside end of elastic component is connected to the medial extremity of mounting, and the joint spare is connected to the medial extremity of elastic component, and the joint spare is used for connecting the preimpregnation material prefab.
Furthermore, a limiting hole is formed in the fixing piece, and the outer side end of the elastic piece is connected with the limiting hole through a second locking piece;
the number of the limiting holes is multiple.
Further, the joint spare is equipped with the draw-in groove, and the preimpregnation material prefabricated part passes through the third retaining member and connects in the draw-in groove.
Further, the device also comprises a lifting device;
the mount is connected on jacking equipment, and jacking equipment can drive the mount along vertical direction reciprocating motion, makes the preimpregnation material preform in the mount be close to or keep away from the press aircraft nose.
The invention also provides a molding method of the compression molding mechanism of the composite material prepreg laminated board, which comprises the following steps:
a. cutting prepreg
Cutting the prepreg by using a cutting machine according to the size of a product to form a square prepreg blank, reserving a first clamping block and a second clamping block around the prepreg blank, and reserving a burr allowance in a non-clamping area of the prepreg blank to form a prepreg preform;
b. Ply
According to the laying design of the product structure, laying and configuring a prepreg prefabricated body;
c. fixed prepreg preform
Punching holes on the first clamping block and the second clamping block respectively by using cutting equipment, fixing the first clamping block by using a first elastic connecting piece, and fixing the second clamping block by using a second elastic connecting piece;
d. paving demoulding material
Respectively paving a layer of demoulding material on the upper surface and the lower surface of the prepreg preform, and then driving a pressure head by using a press to carry out mould closing and mould pressing on the prepreg preform; the pressure is set to be 0.1MPa-10MPa according to the requirements of materials and products;
e. heat curing
After the prepreg preform is molded, heating the prepreg preform in situ while closing and pressurizing the upper and lower dies, and heating, pressurizing and curing the prepreg preform, wherein the curing temperature is between 120 and 400 ℃, and the curing time is between 1 and 20 hours;
f. product demoulding
Cooling the cured product at a cooling rate of less than 5 ℃/min;
after the temperature reduction is finished, the product is placed indoors and is cooled to the room temperature until the temperature of the surface of the product is lower than 60 ℃, and then the product is demoulded to form a complete product structure;
g. Product finishing
And grinding and trimming the rough edges of the demoulded product by utilizing a machine tool or manually grinding to form a qualified product.
Compared with the prior art, the compression molding mechanism for the composite material prepreg laminated board has the following advantages:
the fixing frame is arranged at the lower part of the pressure head of the punching machine, and the mounting position of the fixing frame is limited; the elastic frame is arranged in the fixed frame and limits the installation position of the elastic frame; the outer side end of the elastic frame is connected to the fixed frame, and the inner side end of the elastic frame is used for connecting the prepreg preforms so as to limit the connecting positions of the prepreg preforms by using the elastic frame; the prepreg preform is fixed by the elastic frame, the tension is kept by the elastic force of the elastic frame, and the three-dimensional feeding amount is adjusted by the elastic frame, so that the applied tension and the tension angle during product molding are adjusted, wrinkling caused by a material compression area in the molding process is reduced, and the product yield is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a composite prepreg laminate compression molding mechanism provided in an embodiment of the present invention in use;
FIG. 2 is a schematic structural diagram of a compression molding mechanism for a composite prepreg laminate provided in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a first elastic connecting element according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a prepreg preform provided in an embodiment of the present invention;
FIG. 5 is a schematic view of another connection mode between a first connecting rod and a fixing member according to an embodiment of the present invention;
fig. 6 is a flowchart of a molding method of a composite prepreg laminate molding mechanism according to an embodiment of the present invention.
Description of reference numerals:
100-a fixing frame; 200-an elastic frame;
300-prepreg preform; 101-a first connecting rod;
102-a second connecting rod; 103-an inner accommodating space;
104-a first connection hole; 105-a second connection hole;
106-a first locking member; 201-a first elastic connection;
202-a second elastic connector; 203-a fixing member;
204-an elastic member; 205-a clip;
206-a limiting hole; 207-a second locking member;
208-card slot; 209-a third locking member;
301-a first clamping block; 302-second clamping block.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 4, the compression molding mechanism for a composite material prepreg laminate provided by the invention comprises a fixed frame 100 and an elastic frame 200;
the fixing frame 100 is arranged at the lower part of the press head of the punching machine, and the elastic frame 200 is arranged in the fixing frame 100;
the outer end of the elastic frame 200 is connected to the fixed frame 100, and the inner end of the elastic frame 200 is used for connecting the prepreg 300.
In an embodiment of the present invention, as shown in fig. 1, the fixing frame 100 is fixedly connected to a position below the ram of the stamping press by using a plurality of bolts, the elastic frame 200 is disposed inside the fixing frame 100, an outer end of the elastic frame 200 is connected to the fixing frame 100 by using a bolt, and an inner end of the elastic frame 200 is connected to the clamping blocks around the prepreg 300 by using a bolt, so as to fix the position of the prepreg 300.
When the device is used, the elastic frame 200 is used for fixing the prepreg preform 300, the prepreg preform 300 can keep tension through the spring frame of the elastic frame 200, and the spring frame can also adjust the feeding amount in a three-dimensional mode, so that the tension applied to the prepreg preform 300 and the tension angle during forming are adjusted, and wrinkling caused by a material compression area in the forming process of the prepreg preform 300 is finally reduced. The spring model of this application elastic frame 200, the position of spring coupling and the tension of spring can all simulate the optimization through the prepreg preform 300 of difference, and during punching press pressure head stamping forming, ensure the qualification rate of product.
Further, the fixing frame 100 includes a first connecting rod 101 and a second connecting rod 102;
the number of the first connecting rods 101 is at least two, and the number of the second connecting rods 102 is at least two;
a first connecting rod 101 and a second connecting rod 102 are cross-connected to form a frame structure having an inner receiving space 103, and the elastic frame 200 is disposed in the inner receiving space 103.
In this embodiment, as shown in fig. 2, the first connecting rod 101 is a horizontal cross rod, the second connecting rod 102 is a vertical rod, and both the two connecting rods are square or circular tubes. The number of the first connecting rods 101 and the second connecting rods 102 is two, one first connecting rod 101 and one second connecting rod 102 are connected in a cross manner to form a square frame structure after connection, the square frame structure is provided with a square inner accommodating space 103, and the elastic frame 200 is arranged in the inner accommodating space 103.
In other embodiments, the number of the first connecting rods 101 and the number of the second connecting rods 102 may also be three, one first connecting rod 101 and one second connecting rod 102 are cross-connected to form a hexagonal frame structure after connection, the hexagonal frame structure is provided with a hexagonal inner accommodating space 103, and the elastic frame 200 is disposed in the inner accommodating space 103.
In a specific embodiment, the first connecting rod 101 and the second connecting rod 102 may be provided in other numbers according to the use requirement.
Further, a first connecting hole 104 is formed in the first connecting rod 101, and a second connecting hole 105 is formed in the second connecting rod 102;
the first connecting hole 104 and the second connecting hole 105 are connected by a first locking member 106, so that the first connecting rod 101 and the second connecting rod 102 are connected.
In this embodiment, as shown in fig. 2, the first connecting hole 104 and the second connecting hole 105 are both threaded holes, the first locking member 106 is a bolt, and after the two connecting rods are positioned, the two connecting holes are connected by the bolt for fixing, so that the connecting positions of the two connecting rods are firm, and the bolt is connected for facilitating the disassembly and assembly as required.
Further, the number of the first connection holes 104 is plural, and the number of the second connection holes 105 is plural.
In the present embodiment, as shown in fig. 2, a plurality of first connection holes 104 are provided in the first connection rod 101, a plurality of second connection holes 105 are provided in the second connection rod 102, and the connection positions of the two connection rods can be adjusted by the positions of the connection holes and the positioning of the bolts, thereby adjusting the feeding amount of the prepreg 300.
Further, the elastic frame 200 includes a first elastic connection member 201 and a second elastic connection member 202;
the outer end of the first elastic connecting piece 201 is connected to the first connecting rod 101, and the inner end of the first elastic connecting piece 201 is connected to the first clamping block 301 of the prepreg preform 300; the outer end of the second elastic connecting piece 202 is connected to the second connecting rod 102, and the inner end of the second elastic connecting piece 202 is connected to the second clamping block 302 of the prepreg preform 300;
the structure of the first elastic connection member 201 is the same as that of the second elastic connection member 202.
In the present embodiment, as shown in fig. 1, 2 and 4, the first elastic connecting member 201 is vertically disposed, and the second elastic connecting member 202 is horizontally disposed; the two first connecting rods 101 and the two second connecting rods 102 are connected to form a square frame structure. In fig. 4, three first clamping blocks 301 are respectively disposed on the upper side and the lower side of the prepreg 300, in fig. 2, the three first clamping blocks 301 are fixed on the upper side by using three first elastic connecting members 201, and the three first clamping blocks 301 are fixed on the lower side by using three first elastic connecting members 201. In fig. 4, three second clamping blocks 302 are respectively disposed on the left side and the right side of the prepreg preform 300, in fig. 2, three second clamping blocks 302 are fixed on the left side by using three second elastic connectors 202, and three second clamping blocks 302 are fixed on the right side by using three second elastic connectors 202, so that the position fixing of the prepreg preform 300 is completed.
Further, the first elastic connecting member 201 includes a fixing member 203, an elastic member 204 and a clamping member 205;
the outer side end of the fixing piece 203 is connected to the first connecting rod 101, the inner side end of the fixing piece 203 is connected to the outer side end of the elastic piece 204, the inner side end of the elastic piece 204 is connected to the clamping piece 205, and the clamping piece 205 is used for connecting the prepreg preform 300.
In this embodiment, as shown in fig. 3, the fixing member 203 is a strip-shaped plate, the elastic member 204 is a spring, and the clamping member 205 is a square block. The outer end of the fixing piece 203 is connected to the first connecting rod 101 through a bolt, and the bolt can adjust the connecting position of the fixing piece 203 on the first connecting rod 101; the inner side end of the fixing piece 203 is connected with the outer side end of the spring through a bolt, the inner side end of the spring is connected with the clamping piece 205 through a bolt, and the clamping piece 205 is used for fixing the clamping block of the prepreg preform 300 through a bolt.
In another embodiment, as shown in fig. 5, a clamping groove is formed on the first connecting rod 101, a clamping block is arranged below the fixing element 203 of the first elastic connecting element 201, and the connecting position of the first elastic connecting element 201 on the first connecting rod 101 is fixed by utilizing the clamping connection between the clamping block and the clamping groove; similarly, the second connecting rod 102 is also provided with a clamping groove, a clamping block is arranged below the fixing element 203 of the second elastic connecting element 202, and the connecting position of the second elastic connecting element 202 on the second connecting rod 102 is fixed by utilizing the clamping connection between the clamping block and the clamping groove. By adopting the connection mode, after the prepreg preform 300 is fixed, the springs on the two elastic connecting pieces are in a stretching state, and the connecting positions of the two elastic connecting pieces can be fixed by utilizing the stretching force of the springs through the pressure applied by the prepreg preform 300.
Furthermore, a limiting hole 206 is formed in the fixing member 203, and the outer end of the elastic member 204 is connected to the inside of the limiting hole 206 through a second locking member 207;
the number of the stopper holes 206 is plural.
In this embodiment, as shown in fig. 3, the limiting holes 206 are threaded holes, the second locking member 207 is a bolt, the fixing member 203 is provided with a plurality of limiting holes 206, and the outer end of the spring can be connected and fixed in any one of the limiting holes 206, so that the expansion and contraction amount of the spring can be directly adjusted, and finally the feeding amount of the prepreg 300 can be adjusted.
Further, the clamping piece 205 is provided with a clamping groove 208, and the prepreg 300 is connected in the clamping groove 208 through a third locking piece 209.
In this embodiment, as shown in fig. 3, the card slot 208 is a square slot formed by recessing inwards along the horizontal direction at the outer end of the card member 205; the outer side end of the clamping piece 205 penetrates through the square groove along the vertical direction to form a threaded through hole, and the third locking piece 209 is a bolt; the through hole is arranged on the clamping block of the prepreg preform 300 along the vertical direction, and after the clamping block is clamped into the clamping groove 208, the clamping block is fixed in the clamping groove 208 by a bolt penetrating through the threaded through hole at the outer side end of the clamping piece 205 and the through hole on the clamping block.
Further, the device also comprises a lifting device;
mount 100 is connected on jacking equipment, and jacking equipment can drive mount 100 along vertical direction reciprocating motion, makes the prepreg preform 300 in mount 100 be close to or keep away from the press aircraft nose.
In one embodiment of the present application, the lifting device is a hydraulic cylinder, the hydraulic cylinder is fixed at a lower position of the press by bolts, and the fixing frame 100 is connected at an output end of the hydraulic cylinder by bolts. When the prepreg pressing machine is used, the hydraulic cylinder drives the fixing frame 100 to extend upwards in the vertical direction, the prepreg prefabricated body 300 is driven to be close to a pressing head of the pressing machine upwards, and the pressing machine can be started to perform pressing operation; after the punching press finishes, start the pneumatic cylinder once more, the pneumatic cylinder drives mount 100 in vertical direction and withdraws the motion downwards, drives prepreg prefabricated body 300 and keeps away from the punching press pressure head downwards, protects mount 100.
In other embodiments, the lifting device may also adopt a structure in which the driving motor and the worm gear are connected, as long as the fixing frame 100 can be driven to move close to or away from the press ram.
As shown in fig. 6, the invention also provides a molding method of a composite material prepreg laminate molding mechanism, which comprises the following steps:
a. Cutting prepreg
Cutting the prepreg rough blank by using a cutting machine according to the size of a product to form a square prepreg rough blank, reserving a first clamping block 301 and a second clamping block 302 around the prepreg rough blank, and reserving a burr allowance in a non-clamping area of the prepreg rough blank to form a prepreg preform 300;
in this embodiment, the clamping block is a square block of 5cm-15cm, the embodiment adopts a square block of 10cm, and the size of practical use is adjusted according to the thickness of the product by presetting the spring tension. Three first clamping blocks 301 are reserved on the upper side and the lower side of the prepreg preform 300 respectively, and three second clamping blocks 302 are reserved on the left side and the right side of the prepreg preform 300 respectively.
b. Ply
According to the laying design of the product structure, laying configuration is carried out on the prepreg prefabricated body 300;
c. fixed prepreg preform
With a cutting device, for example: scissors, a punching machine and the like, which are respectively used for punching a first clamping block 301 and a second clamping block 302, and the first clamping block 301 is fixed by a first elastic connecting piece 201, and the second clamping block 302 is fixed by a second elastic connecting piece 202;
specifically, the three first elastic connecting members 201 on the upper portion are respectively fixed to the three first clamping blocks 301 on the upper side of the prepreg preform 300, the three first elastic connecting members 201 on the lower portion are respectively fixed to the three first clamping blocks 301 on the lower side of the prepreg preform 300, and the third locking member 209 of the first elastic connecting members 201 fixes the first clamping blocks 301 in the clamping groove 208. The three second elastic connectors 202 on the left side are respectively fixed to the three second clamping blocks 302 on the left side of the prepreg preform 300, the three second elastic connectors 202 on the right side are respectively fixed to the three second clamping blocks 302 on the right side of the prepreg preform 300, and the third locking members 209 of the second elastic connectors 202 fix the second clamping blocks 302 in the clamping grooves 208.
d. Paving demoulding material
Respectively paving a layer of demolding material, such as demolding cloth, on the upper surface and the lower surface of the prepreg preform 300, and then driving a pressure head by using a press to perform mold closing and molding on the prepreg preform 300; the pressure is set to be 0.1MPa-10MPa according to the requirements of materials and products.
In the process, the position of the fixing frame 100 in the vertical direction can also be adjusted by utilizing the lifting device, and after the position of the fixing frame 100 moves to a designated position below the press head of the press, the press is started to carry out die closing and molding.
e. Heat curing
After the prepreg preform 300 is molded, the prepreg preform 300 is heated in situ while the upper and lower molds are closed and pressurized, and at the moment, the prepreg preform 300 can be heated and pressurized for curing by self-heating of the molds or heating in an oven environment, wherein the curing temperature ranges from 120 ℃ to 400 ℃, and the curing time ranges from 1h to 20 h;
in this embodiment, the curing temperature is 150 ℃ and the curing time is 15 h.
f. Product demoulding
Cooling the cured product at a cooling rate of less than 5 ℃/min;
after the temperature reduction is finished, the product is placed indoors and is cooled to the room temperature until the temperature of the surface of the product is lower than 60 ℃, and then the product is demoulded to form a complete product structure; in this embodiment, the product after the solidification can directly be placed and carry out natural cooling in indoor, also can adopt refrigeration plant to cool down, and the cooling time is 2h in refrigeration plant.
g. Product finishing
And grinding and trimming the rough edges of the demoulded product by utilizing a machine tool or manually grinding to form a qualified product.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The compression molding mechanism for the composite material prepreg laminated board is characterized by comprising a fixed frame (100) and an elastic frame (200);
the fixing frame (100) is arranged at the lower part of the press head of the punching machine, and the elastic frame (200) is arranged in the fixing frame (100);
the outer side end of the elastic frame (200) is connected to the fixing frame (100), and the inner side end of the elastic frame (200) is used for being connected with the prepreg prefabricated body (300).
2. A composite prepreg laminate press moulding mechanism as claimed in claim 1 wherein the mounting bracket (100) comprises a first connecting bar (101) and a second connecting bar (102);
the number of the first connecting rods (101) is at least two, and the number of the second connecting rods (102) is at least two;
the first connecting rod (101) and the second connecting rod (102) are connected in a cross mode and are of a frame body structure provided with an inner accommodating space (103), and the elastic frame (200) is arranged in the inner accommodating space (103).
3. A composite prepreg laminate press moulding mechanism as claimed in claim 2 wherein a first connection hole (104) is provided on the first connection bar (101) and a second connection hole (105) is provided on the second connection bar (102);
the first connecting hole (104) is connected with the second connecting hole (105) through a first locking piece (106), so that the first connecting rod (101) is connected with the second connecting rod (102).
4. A composite prepreg laminate press moulding mechanism as claimed in claim 3 wherein the first connection holes (104) are plural in number and the second connection holes (105) are plural in number.
5. A composite prepreg laminate press moulding mechanism as claimed in claim 4 wherein the resilient frame (200) comprises first (201) and second (202) resilient connecting members;
the outer end of the first elastic connecting piece (201) is connected to the first connecting rod (101), and the inner end of the first elastic connecting piece (201) is connected to a first clamping block (301) of the prepreg prefabricated body (300); the outer end of the second elastic connecting piece (202) is connected to the second connecting rod (102), and the inner end of the second elastic connecting piece (202) is connected to a second clamping block (302) of the prepreg preform (300);
The structure of the first elastic connecting piece (201) is the same as that of the second elastic connecting piece (202).
6. A composite prepreg laminate press moulding mechanism as claimed in claim 5 wherein the first resilient connecting member (201) comprises a fixed member (203), a resilient member (204) and a snap member (205);
the outside end of mounting (203) is connected on first connecting rod (101), the medial extremity of mounting (203) is connected the outside end of elastic component (204), the medial extremity of elastic component (204) is connected joint spare (205), joint spare (205) are used for connecting prepreg preform (300).
7. The compression molding mechanism for the composite material prepreg laminate plate according to claim 6, wherein the fixing piece (203) is provided with a limiting hole (206), and the outer end of the elastic piece (204) is connected into the limiting hole (206) through a second locking piece (207);
the number of the limiting holes (206) is multiple.
8. A compression moulding mechanism for a composite prepreg laminate according to claim 7, wherein the snap-in connection (205) is provided with a snap-in slot (208), and the prepreg preform (300) is connected in the snap-in slot (208) by a third locking member (209).
9. The composite prepreg laminate press molding mechanism of claim 8, further comprising a lifting device;
the fixing frame (100) is connected to the lifting device, and the lifting device can drive the fixing frame (100) to reciprocate along the vertical direction, so that the prepreg prefabricated body (300) in the fixing frame (100) is close to or far away from a press machine head.
10. A molding method of a compression molding mechanism of a composite material prepreg laminated board is characterized by comprising the following steps:
a. cutting prepreg
Cutting the prepreg by using a cutting machine according to the size of a product to form a square prepreg blank, reserving a first clamping block (301) and a second clamping block (302) at the periphery of the prepreg blank, and reserving a burr allowance in a non-clamping area of the prepreg blank to form a prepreg preform (300);
b. ply
According to the laying design of a product structure, laying and configuring a prepreg prefabricated body (300);
c. fixed prepreg preform
Punching holes on a first clamping block (301) and a second clamping block (302) by using cutting equipment respectively, fixing the first clamping block (301) by using a first elastic connecting piece (201), and fixing the second clamping block (302) by using a second elastic connecting piece (202);
d. Paving demoulding material
Respectively paving a layer of demolding material on the upper surface and the lower surface of the prepreg prefabricated body (300), and then driving a pressure head by a press to carry out die assembly and die pressing on the prepreg prefabricated body (300); the pressure is set to be 0.1MPa-10MPa according to the requirements of materials and products;
e. heat curing
After the prepreg preform (300) is molded, heating the prepreg preform (300) in situ while closing and pressurizing an upper mold and a lower mold, and heating, pressurizing and curing the prepreg preform, wherein the curing temperature ranges from 120 ℃ to 400 ℃, and the curing time ranges from 1h to 20 h;
f. product demoulding
Cooling the cured product at a cooling rate of less than 5 ℃/min;
after the temperature reduction is finished, the product is placed indoors and is cooled to the room temperature until the temperature of the surface of the product is lower than 60 ℃, and then the product is demoulded to form a complete product structure;
g. product finishing
And grinding and trimming the rough edges of the demoulded product by utilizing a machine tool or manually grinding to form a qualified product.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113276435A (en) * | 2021-05-31 | 2021-08-20 | 济南大学 | Carbon-fibre composite hot-pressing sintering equipment can be regulated and control to structural gradient |
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