CN111844810A - Composite material prepreg laminate molding mechanism and molding method thereof - Google Patents

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

Composite material prepreg laminate molding mechanism and molding method thereof

technical field

The invention relates to the technical field of molding and curing of thermosetting and thermoplastic composite material laminates, in particular to a molding mechanism and a molding method of composite material prepreg laminates suitable for sheet metal profile prepregs.

Background technique

Composite molding has the advantages of fast production speed and good product consistency. During the molding process of the composite material, the prepreg needs to be placed directly at the lower position of the indenter of the punching machine. After the punching machine is started, the indenter directly punches the prepreg at the lower position.

In the prior art, the position of the prepreg is not firmly fixed. During the start-up process of the press head of the stamping machine, when the speed does not match, the stamping deformation of the prepreg is easily caused, and the compression area of the prepreg causes wrinkling. Especially in large corners and edge areas of molded parts, it is almost inevitable that there will be problems of high product scrapping rate and low production efficiency. And the use of this stamping forming method has low work efficiency.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a composite material prepreg laminated plate molding mechanism, so as to solve the problem in the prior art that the position of the prepreg is not fixed firmly, and when the press head of the punching machine presses it, it is easy to lead to prepreg. The compression zone of the impregnated material is wrinkled, causing technical problems with product scrap.

The invention provides a composite material prepreg laminated plate molding mechanism, comprising a fixed frame and an elastic frame;

The fixing frame is arranged at the lower part of the pressing head of the punching machine, and the elastic frame is arranged in the fixing frame;

The outer end of the elastic frame is connected to the fixing frame, and the inner end of the elastic frame is used for connecting the prepreg.

Further, the fixing frame includes 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 cross-connected to form a frame structure with an internal accommodation space, and the elastic frame is arranged in the inner accommodation space.

Further, the first connecting rod is provided with a first connecting hole, and the second connecting rod is provided with a second connecting hole;

The first connecting hole and the second connecting hole are connected by a first locking piece, so as to realize the connection between the first connecting rod and the second connecting rod.

Further, the number of the first connection holes is multiple, and the number of the second connection holes is multiple.

Further, the elastic frame includes a first elastic connecting piece and a second elastic connecting piece;

The outer end of the first elastic connecting piece is connected to the first connecting rod, the inner end of the first elastic connecting piece is connected to the first clamping block of the prepreg preform; the outer end of the second elastic connecting piece is connected to the second connecting rod the inner end of the second elastic connector is connected to the second clamping block of the prepreg;

The structure of the first elastic connecting piece is the same as that of the second elastic connecting piece.

Further, the first elastic connecting piece includes a fixing piece, an elastic piece and a clipping piece;

The outer end of the fixing piece is connected to the first connecting rod, the inner end of the fixing piece is connected with the outer end of the elastic piece, and the inner end of the elastic piece is connected with the clamping piece, and the clamping piece is used for connecting the prepreg.

Further, the fixing piece is provided with a limit hole, and the outer end of the elastic piece is connected to the limit hole through the second locking piece;

The number of limit holes is multiple.

Further, the clamping part is provided with a clamping groove, and the prepreg is connected in the clamping groove through a third locking part.

Further, it also includes lifting equipment;

The fixing frame is connected to the lifting device, and the lifting device can drive the fixing frame to reciprocate along the vertical direction, so that the prepreg in the fixing frame is close to or away from the press head.

The present invention also provides a molding method for a composite material prepreg laminate molding mechanism, comprising the following steps:

a. Cut the prepreg

According to the product size, the prepreg is cut with a cutting machine to form a square prepreg blank, and the first clamping block and the second clamping block are reserved around the prepreg blank. A burr margin is reserved in the non-clamping area of the blank to form a prepreg;

b. Laminate

According to the layup design of the product structure, the prepreg prefabricated body is laid up;

c. Fixed prepreg preform

Use cutting equipment to punch holes on the first clamping block and the second clamping block respectively, use the first elastic connecting piece to fix the first clamping block, and use the second elastic connecting piece to fix the second clamping block;

d. Lay out the mold release material

Lay a layer of release material on the upper and lower surfaces of the prepreg, and then use the press to drive the indenter to mold the prepreg; the pressure is set to 0.1MPa-10MPa, depending on the material and product requirements setting;

e. Heat curing

After the prepreg preform is molded, the prepreg preform is heated in situ while the upper and lower molds are clamped and pressurized, and the prepreg is heated and pressed to cure. The curing temperature ranges from 120 to 400 °C. The curing time ranges from 1h to 20h;

f. Product demoulding

The cured product is subjected to cooling treatment, and the cooling rate is less than 5℃/min;

After cooling, place the product indoors, let it cool down to room temperature, until the temperature of the product surface is lower than 60 °C, and then demold the product to form a complete product structure;

g. Product trimming

Use machine tools or manual grinding to grind and trim the burrs of the demolded products to form qualified products.

Compared with the prior art, the composite material prepreg laminate molding mechanism of the present invention has the following advantages:

The fixing frame of the present invention is arranged at the lower part of the pressing head of the punching machine to limit the installation position of the fixing frame; the elastic frame is arranged inside the fixing frame to limit the installation position of the elastic frame; the outer end of the elastic frame is connected to the fixing frame The inner end of the elastic frame is used to connect the prepreg, so that the connection position of the prepreg is limited by the elastic frame; the present invention uses the elastic frame to fix the prepreg, and the elastic force of the elastic frame is used to fix the prepreg. The tension is maintained, and the three-dimensional feed is adjusted by the elastic frame, so as to adjust the applied tension and the tension angle when the product is formed, thereby reducing the wrinkling caused by the compression area of the material during the forming process, and improving the qualified rate of the product.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a composite material prepreg laminate molding mechanism when used in an embodiment of the present invention;

2 is a schematic structural diagram of a composite material prepreg laminate molding mechanism provided in an embodiment of the present invention;

3 is a schematic structural diagram of a first elastic connector provided by an embodiment of the present invention;

4 is a schematic structural diagram of a prepreg preform provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of another connection mode between the first connecting rod and the fixing member provided by the embodiment of the present invention;

6 is a flowchart of a molding method of a composite material prepreg laminate molding mechanism provided in an embodiment of the present invention.

Description of reference numbers:

100-fixed frame; 200-flexible frame;

300-prepreg preform; 101-first connecting rod;

102-the second connecting rod; 103-inner accommodation space;

104-first connection hole; 105-second connection hole;

106-first locking piece; 201-first elastic connecting piece;

202-second elastic connecting piece; 203-fixing piece;

204-elastic part; 205-clamping part;

206-limiting hole; 207-second locking piece;

208-card slot; 209-third locking piece;

301 - the first clamping block; 302 - the second clamping block.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figures 1-4, a composite material prepreg laminate molding mechanism provided by the present invention includes a fixing frame 100 and an elastic frame 200;

The fixing frame 100 is arranged at the lower part of the pressing 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 fixing frame 100 , and the inner end of the elastic frame 200 is used for connecting the prepreg 300 .

In one embodiment of the present invention, as shown in FIG. 1 , the fixing frame 100 is fixedly connected to the position below the pressing head of the punching machine by using a plurality of bolts, the elastic frame 200 is arranged inside the fixing frame 100 , and the outer end of the elastic frame 200 adopts The bolts are connected to the fixing frame 100 , and the inner end of the elastic frame 200 is bolted to the clamping blocks around the prepreg 300 to fix the position of the prepreg 300 .

During use, the prepreg 300 is fixed by the elastic frame 200, and the spring frame of the elastic frame 200 enables the prepreg 300 to maintain tension, and the spring frame can also adjust the feed amount three-dimensionally, thereby adjusting The tension applied to the prepreg 300 and the tension angle during forming ultimately reduce the wrinkling caused by the material compression area of the prepreg 300 during the forming process. The spring type of the elastic frame 200 of the present application, the position of the spring connection and the tension of the spring can be simulated and optimized by different prepregs 300, and the qualified rate of the product can be ensured when the stamping head of the stamping machine is stamped and formed.

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 is cross-connected with a second connecting rod 102 , and connected to form a frame structure with an internal accommodating space 103 , and the elastic frame 200 is arranged in the internal accommodating 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 of the two connecting rods use a square tube or a round tube. The number of the first connecting rod 101 and the number of the second connecting rod 102 is two respectively, and a first connecting rod 101 is cross-connected with a second connecting rod 102, and after the connection, a square frame structure is formed, and the square frame structure is provided with a square frame. In the inner accommodating space 103 , the elastic frame 200 is arranged in the inner accommodating space 103 .

In other embodiments, the number of the first connecting rod 101 and the number of the second connecting rod 102 can also be set to three respectively, and one first connecting rod 101 and one second connecting rod 102 are cross-connected, and after the connection, a hexagonal frame is formed The hexagonal frame body structure is provided with a hexagonal inner accommodating space 103 , and the elastic frame 200 is arranged in the inner accommodating space 103 .

In a specific implementation manner, the first connecting rod 101 and the second connecting rod 102 can also be set to other numbers according to the needs of use.

Further, the first connecting rod 101 is provided with a first connecting hole 104, and the second connecting rod 102 is provided with a second connecting hole 105;

The first connection hole 104 and the second connection hole 105 are connected by the first locking member 106 to realize the connection between the first connection rod 101 and the second connection rod 102 .

In this embodiment, as shown in FIG. 2 , the first connection hole 104 and the second connection hole 105 are both threaded holes, and the first locking member 106 is a bolt. After the two connecting rods are positioned, bolts are used to connect the two The connection hole is fixed to make the connection position of the two connecting rods firm, and the bolt connection is adopted to facilitate disassembly and assembly as required.

Further, the number of the first connection holes 104 is multiple, and the number of the second connection holes 105 is multiple.

In this embodiment, as shown in FIG. 2 , the first connecting rod 101 is provided with a plurality of first connecting holes 104 , and the second connecting rod 102 is provided with a plurality of second connecting holes 105 , and the bolts are positioned according to the positions of the connecting holes. , the connection positions of the two connecting rods can be adjusted, so as to adjust the feeding amount of the prepreg 300 .

Further, the elastic frame 200 includes a first elastic connecting member 201 and a second elastic connecting member 202;

The outer end of the first elastic connector 201 is connected to the first connecting rod 101 , the inner end of the first elastic connector 201 is connected to the first clamping block 301 of the prepreg 300 ; the outer end of the second elastic connector 202 The end 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 300;

The structure of the first elastic connecting member 201 is the same as that of the second elastic connecting member 202 .

In this embodiment, as shown in FIG. 1 , FIG. 2 , and FIG. 4 , the first elastic connecting member 201 is arranged vertically, and the second elastic connecting member 202 is arranged horizontally; two first connecting rods 101 and two second connecting rods The rods 102 are connected to form a square frame structure. In FIG. 4 , the upper and lower sides of the prepreg 300 are respectively provided with three first clamping blocks 301 , and in FIG. 2 , the upper side is fixed with three first elastic connectors 201 The lower side of the first clamping block 301 adopts three first elastic connecting pieces 201 to fix the three first clamping blocks 301 . In FIG. 4 , the left side and the right side of the prepreg 300 are respectively provided with three second clamping blocks 302 , and in FIG. 2 , the left side is fixed with three second elastic connectors 202 for three For the second clamping block 302 , three second elastic connecting pieces 202 are used to fix the three second clamping blocks 302 on the right side to complete the position fixation of the prepreg 300 .

Further, the first elastic connecting member 201 includes a fixing member 203, an elastic member 204 and a clamping member 205;

The outer end of the fixing member 203 is connected to the first connecting rod 101 , the inner end of the fixing member 203 is connected to the outer end of the elastic member 204 , and the inner end of the elastic member 204 is connected to the clamping member 205 , and the clamping member 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 structure, the elastic member 204 is a spring, and the clamping member 205 is a square block structure. The outer end of the fixing member 203 is connected to the first connecting rod 101 by bolts, and the bolts can adjust the connection position of the fixing member 203 on the first connecting rod 101; the inner end of the fixing member 203 is connected with the outer end of the spring by bolts, The inner end of the spring is connected to the clip 205 by bolts, and the clip 205 is fixed to the clamping block of the prepreg 300 by bolts.

In another embodiment, as shown in FIG. 5 , the first connecting rod 101 is provided with a card slot, and the lower part of the fixing member 203 of the first elastic connecting member 201 is provided with a card block, and the card block and the card groove are snap-connected. , to fix the connection position of the first elastic connecting piece 201 on the first connecting rod 101 ; similarly, the second connecting rod 102 is also provided with a slot, and the lower part of the fixing piece 203 of the second elastic connecting piece 202 is provided with a blocking block , the connection position of the second elastic connecting piece 202 on the second connecting rod 102 is fixed by the snap connection between the locking block and the card slot. By connecting in this way, after the prepreg 300 is fixed, the springs on the two elastic connectors are in a stretched state, and the pressure exerted by the prepreg 300 and the tensile force of the spring can be used to The connection positions of the two elastic connectors are fixed.

Further, the fixing member 203 is provided with a limiting hole 206, and the outer end of the elastic member 204 is connected to the limiting hole 206 through the second locking member 207;

The number of the limiting holes 206 is plural.

In this embodiment, as shown in FIG. 3 , the limiting hole 206 is a threaded hole, the second locking member 207 is a bolt, a plurality of limiting holes 206 are provided on the fixing member 203, and the outer end of the spring can be connected and fixed to the In any limit hole 206, the expansion and contraction amount of the spring is directly adjusted, and finally the feeding amount of the prepreg 300 is adjusted.

Further, the clamping member 205 is provided with a clamping groove 208 , and the prepreg 300 is connected in the clamping groove 208 through a third locking member 209 .

In this embodiment, as shown in FIG. 3 , the clamping slot 208 is a square groove formed by inwardly recessing the outer end of the clamping element 205 along the horizontal direction; the outer end of the clamping element 205 is along the vertical direction. , a threaded through hole is formed through the square groove, and the third locking member 209 is a bolt; the clamping block of the prepreg 300 is provided with a through hole along the vertical direction. The bolts pass through the threaded through holes at the outer end of the clamping piece 205 and the through holes on the clamping block to fix the clamping block in the clamping slot 208 .

Further, it also includes lifting equipment;

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 300 in the fixing frame 100 is close to or away from the press head.

In an embodiment of the present application, the lifting device adopts a hydraulic cylinder, the hydraulic cylinder is fixed at a position below the punching machine by bolts, and the fixing frame 100 is connected to the output end of the hydraulic cylinder by bolts. When in use, the hydraulic cylinder drives the fixing frame 100 to extend upward in the vertical direction, and drives the prepreg material 300 upward to approach the pressing head of the punching machine. At this time, the punching machine can be started for punching operation; after the punching is completed, the hydraulic pressure is started again. The hydraulic cylinder drives the fixing frame 100 to retract downward in the vertical direction, and drives the prepreg material 300 downward away from the pressing head of the punching machine, so as to protect the fixing frame 100 .

In other embodiments, the lifting device may also adopt a structure in which a driving motor and a worm gear are connected, as long as the fixing frame 100 can be driven to move closer to or away from the pressing head of the punching machine.

As shown in Figure 6, the present invention also provides a molding method for a composite material prepreg laminate molding mechanism, comprising the following steps:

a. Cut the prepreg

According to the product size, the prepreg blank is cut with a cutting machine to form a square prepreg blank, and the first clamping block 301 and the second clamping block 302 are reserved around the prepreg blank. A burr margin is reserved in the non-clamping area of the prepreg blank to form a prepreg preform 300;

In this embodiment, a square block with a size of 5cm-15cm is set for the clamping block. In this embodiment, a square block of 10cm is used. The actual size is adjusted according to the thickness of the product and the preset spring tension setting. 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 are reserved on the left side and the right side of the prepreg preform 300 respectively 302.

b. Laminate

According to the layup design of the product structure, the prepreg prefab 300 is laid up and configured;

c. Fixed prepreg preform

Use cutting equipment, such as scissors, punching machine, etc., to punch holes on the first clamping block 301 and the second clamping block 302 respectively, and use the first elastic connector 201 to fix the first clamping block 301. The second elastic connecting member 202 is fixed to the second clamping block 302;

Specifically, the three first elastic connectors 201 on the upper part are respectively fixed to the three first clamping blocks 301 on the upper side of the prepreg 300, and the three first elastic connectors 201 on the lower part are respectively fixed to the prepreg The three first clamping blocks 301 on the lower side of the preform 300 are fixed, and the third locking member 209 of the first elastic connecting member 201 fixes the first clamping blocks 301 in the clamping slot 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 300, and the three second elastic connectors 202 on the right side are respectively fixed to the prepreg 300. The three second clamping blocks 302 on the right side of the preform 300 are fixed, and the second clamping blocks 302 are fixed in the clamping slot 208 by the third locking member 209 of the second elastic connecting member 202 .

d. Lay out the mold release material

A layer of mold release material, such as mold release cloth, is respectively laid on the upper and lower surfaces of the prepreg 300, and then the press is used to drive the indenter to mold the prepreg 300; the pressure is set to 0.1 MPa-10MPa, set according to material and product requirements.

During this process, the vertical position of the fixing frame 100 can also be adjusted by means of a lifting device. After the position of the fixing frame 100 is moved to a designated position below the pressing head of the punching machine, the punching machine is started for clamping and moulding.

e. Heat curing

After the prepreg 300 is molded, the prepreg 300 is heated in-situ while the upper and lower molds are clamped and pressurized. The preform 300 is heated and pressurized for curing, the curing temperature ranges from 120°C to 400°C, and the curing time ranges from 1h to 20h;

In this embodiment, the value of curing temperature is 150° C., and the value of curing time is 15h.

f. Product demoulding

The cured product is subjected to cooling treatment, and the cooling rate is less than 5℃/min;

After the cooling is completed, the product is placed in the room to cool down to room temperature until the temperature of the product surface is lower than 60°C, and then the product is demolded to form a complete product structure; in this embodiment, the cured product can be It can be directly placed indoors for natural cooling, or cooling equipment can be used for cooling, and the cooling time in the cooling equipment is 2h.

g. Product trimming

Use machine tools or manual grinding to grind and trim the burrs of the demolded products to form qualified products.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

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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