CN113442465A - Forming device and method for preparing composite material rod by utilizing thermoplastic prepreg tape - Google Patents
Forming device and method for preparing composite material rod by utilizing thermoplastic prepreg tape Download PDFInfo
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- CN113442465A CN113442465A CN202110720230.5A CN202110720230A CN113442465A CN 113442465 A CN113442465 A CN 113442465A CN 202110720230 A CN202110720230 A CN 202110720230A CN 113442465 A CN113442465 A CN 113442465A
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- base
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
A forming device and a forming method for preparing a composite material rod by utilizing a thermoplastic prepreg tape belong to the technical field of civil engineering composite material rod preparation. The invention solves the problems of high cost, high energy consumption and low production efficiency in the existing preparation process of the thermoplastic resin composite material rod. The middle support and the base are fixedly connected through a plurality of fixing bolts, a long-strip-shaped limiting through hole is formed in the middle of the middle support along the length direction of the middle support, a long-strip-shaped lug structure is integrally processed at the bottom end of the top cover, the lug structure is inserted into the limiting through hole in a matched mode, a first groove is formed in the upper end face of the base along the length direction of the base, a second groove is formed in the lower end face of the lug structure along the length direction of the lug structure, and the first groove is the same as the second groove in length and is in a circular hole shape in a butt joint mode.
Description
Technical Field
The invention relates to a forming device and a forming method for preparing a composite material rod by using a thermoplastic prepreg tape, and belongs to the technical field of preparation of civil engineering composite material rods.
Background
The premature degradation of the performance of the prestressed steel strand stay cable in the service process of the bridge causes the insufficient reliability and potential safety hazard of the bridge structure, and meanwhile, the frequent replacement and maintenance of the cable increase the labor and material cost. Relevant researches show that the high performance and the long service life of the bridge engineering structure can be realized by reasonably replacing steel strands with low specific strength and poor corrosivity with a light-weight, high-strength and durable Fiber Reinforced Polymer (FRP) rod body, and the safety and the durability in the service process are improved.
At present, the main matrix type of the FRP rod body for the bridge structure is thermosetting resin, such as epoxy resin, and the FRP rod body has the advantages of simple and convenient processing and forming, high production efficiency, high strength/modulus and the like. However, thermosetting epoxy resin has a three-dimensional network cross-linked structure, has poor fracture toughness, and is easy to generate cracks and stress concentration under complex stress conditions to cause fatigue damage and destruction; in addition, the molecular structure of the epoxy resin contains a large amount of hydroxyl groups, so that the epoxy resin is easy to absorb moisture, resin hydrolysis, plasticization and fiber debonding are caused, and fatigue damage of the fiber composite material is accelerated; in addition, the epoxy resin can not be melted again and recycled after being cured, and the waste can not be recycled, thereby not only polluting the environment, but also causing resource waste. Compared with the prior art, the thermoplastic resin has the characteristics of excellent fracture toughness, heat and humidity resistance and fatigue resistance, recyclability, no environmental pollution and the like, and gradually replaces thermosetting resin to become the most potential resin matrix of the fiber composite material rod body, so that the thermoplastic resin composite material rod body is more suitable for being applied to a bridge structure with complex service environment and higher bearing capacity requirement as a stay cable.
Compared with thermosetting resin composite materials, the thermoplastic resin composite materials are difficult to fully infiltrate into fibers due to higher resin viscosity, so that the preparation difficulty is increased. At present, the molding process of the thermoplastic resin composite material mainly comprises fiber winding molding, extrusion molding, centrifugal casting molding and the like. The winding molding is to heat the continuous fiber or cloth belt pre-soaked with resin to be molten, then wind the continuous fiber or cloth belt on a core mold, heat and pressurize the continuous fiber or cloth belt to be welded into a whole, and then obtain a thermoplastic resin composite material product after curing molding and demolding; the extrusion molding is a molding method for preparing a thermoplastic product by performing gum dipping treatment, extrusion molding, heating, curing and shaping and fixed-length cutting on fibers under the action of external force traction; the centrifugal casting molding is to put resin, fiber and filler into a rotary mold in proportion, extrude the material in the mold to be compact under the action of centrifugal force generated by high-speed rotation, remove air in the mold, and then solidify the material to obtain the thermoplastic composite material product. The thermoplastic resin composite material prepreg tape with stable performance can be prepared by adopting the process, because the thickness of the prepreg tape is small, the resin can be fully soaked into the fiber; and further putting the thermoplastic resin prepreg tape into a metal mold through a mold pressing or laminating molding method, melting the resin under the action of certain temperature and pressure, and cooling to prepare the thermoplastic resin composite material plates with different sizes and stable performance. However, the existing method for preparing the thermoplastic resin composite rod mainly uses an extrusion device, has the disadvantages of high cost, high energy consumption, low production efficiency and the like, and lacks an effective, simple and low-energy-consumption method and device for forming the thermoplastic resin composite rod.
Aiming at the problems of high cost, high energy consumption, low production efficiency and the like in the existing preparation process of the thermoplastic resin composite material rod, a simple and reliable molding device and method for the thermoplastic resin composite material rod, which are convenient to process and wide in application range, are urgently needed.
Disclosure of Invention
The invention aims to solve the technical problems and further provides a forming device and a forming method for preparing a composite material rod by utilizing a thermoplastic prepreg tape.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides an utilize thermoplasticity preimpregnation area preparation combined material pole's forming device, it includes by top cap, middle support and the base of arranging in proper order and closely laminating from top to bottom, wherein through a plurality of fixing bolt rigid couplings between middle support and the base, long banding spacing through-hole has been seted up along its length direction at the middle part of middle support, and the bottom integrated processing of top cap has long banding lug structure, just lug structure cooperation cartridge is in the spacing through-hole, first recess has been seted up along its length direction to the base up end, and the second recess has been seted up along its length direction to the lower terminal surface of lug structure, and first recess is the round hole form with the same and butt joint of second recess length.
Furthermore, the number of the fixing bolts is four, and the fixing bolts are respectively distributed on two sides of the limiting through hole in the length direction and two sides of the limiting through hole in the width direction.
A molding method adopting the molding device comprises the following steps:
step one, cleaning: cleaning impurities in the top cover, the middle support and the base by adopting alcohol;
step two, cutting the prepreg tape: cutting the thermoplastic composite prepreg tape into long strips along the fiber direction by using a precision cutting machine, wrapping the prepreg tape by using a plastic adhesive tape to form a rod-shaped structure, and cutting two ends of the prepreg tape of the rod-shaped structure by using the cutting machine to enable the length of the two ends to be consistent with that of the first groove;
step three, mounting an intermediate support and a base: fixing the middle support on the base through a fixing bolt;
step four, installing a top cover: pressing the prepreg tape with the rod-shaped structure into the first groove on the base along the limiting through hole, and then inserting the bump structure on the top cover into the limiting through hole to ensure that the first groove is butted with the second groove and is tightly contacted with the prepreg tape, thereby completing the installation of the molding device;
step five, heating: placing the installed forming device in an oven, setting heating temperature and time, and simultaneously placing a pressing block on a top cover to ensure that the second groove extrudes the prepreg tape to form a uniform and compact rod body after thermoplastic resin in the prepreg tape is melted;
step six: taking out: after thermoforming, the top cover is removed from the intermediate support, and the thermoplastic composite rod is removed after the fixing bolts are removed and the intermediate support is removed.
Furthermore, the top cover and the lug structure at the bottom end of the top cover are integrally communicated with each other to form an exhaust hole, and bubbles generated in the heating process are exhausted along the exhaust hole.
Furthermore, the number of the exhaust holes is two and the exhaust holes are symmetrically distributed at two ends of the bump structure.
Furthermore, at least two cover lifting bolts are installed on the top cover.
Further, the heating temperature set in the fifth step is 5-10 ℃ higher than the melting point temperature of the thermoplastic resin.
Furthermore, before the middle support and the base are installed, the middle support and the base are positioned through the two positioning bolts, the relative position of the middle support and the base is ensured, the middle support and the base are screwed down by adopting the sequence of the middle support and the rear support, the middle support is fixed on the base, and the middle support is ensured to be completely aligned with the base.
Compared with the prior art, the invention has the following effects:
the thermoplastic resin composite material rod is prepared through a circular hole formed between the top cover and the base, the design is simple, the processing is convenient, the cost is lower, rod bodies with different diameters and lengths can be prepared according to different sizes of the first groove and the second groove, the application range is wide, the formed rod bodies are uniform and compact, and the size is stable.
Through a plurality of fixing bolts, the middle support and the base are tightly and reliably fixed together, and the prepared rod body is ensured to have good dimensional stability.
The forming method of the application utilizes the principle of thermoplastic resin heating, melting and cooling forming, the fiber prepreg tape is placed in the forming device to be heated to the temperature above the melting point temperature of the resin, and the forming process is completed in the forming device after the resin is fully melted.
Drawings
FIG. 1 is a schematic front view of the present application;
FIG. 2 is a schematic front view of the top cover;
FIG. 3 is a schematic bottom view of the top cover;
FIG. 4 is a schematic side view of the top cover;
FIG. 5 is a schematic front view of the intermediate support;
FIG. 6 is a schematic top view of the intermediate support;
FIG. 7 is a side view of the intermediate support;
FIG. 8 is a schematic front view of the base;
FIG. 9 is a schematic top view of the base;
fig. 10 is a side view of the base.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 10, and a molding device for preparing a composite rod by using a thermoplastic prepreg tape, which includes a top cover 1, an intermediate support 2 and a base 3, which are sequentially arranged from top to bottom and are tightly attached to each other, wherein the intermediate support 2 is fixedly connected to the base 3 through a plurality of fixing bolts 5, a long-strip-shaped limiting through hole 10 is formed in the middle of the intermediate support 2 along the length direction of the intermediate support, a long-strip-shaped bump structure 11 is integrally processed at the bottom end of the top cover 1, the bump structure 11 is inserted into the limiting through hole 10 in a matched manner, a first groove 12 is formed in the upper end surface of the base 3 along the length direction of the base, a second groove 13 is formed in the lower end surface of the bump structure 11 along the length direction of the base, and the first groove 12 and the second groove 13 have the same length and are in a circular hole shape in a butt joint manner. The second groove 13 is a through groove, and two ends of the second groove are sealed by inner walls of two ends of the limiting through hole 10.
Processing the sizes corresponding to the first groove 12, the second groove 13 and the limiting through hole 10 according to the diameter and the length of the rod body made of the thermoplastic resin composite material; the circular port that encloses between through top cap 1 and base 3 and prepare thermoplastic resin combined material pole, the design is simple, and processing is convenient, can prepare the body of rod of different diameters and length according to the size difference of first recess 12 and second recess 13, and the range of application is wide, and the shaping body of rod is even closely knit, and the size is stable.
Through a plurality of fixing bolts 5, the middle support 2 and the base 3 are tightly and reliably fixed together, and the prepared rod body has good dimensional stability.
The number of the fixing bolts 5 is four, and the fixing bolts are respectively distributed on two sides of the limiting through hole 10 in the length direction and two sides of the limiting through hole in the width direction.
A molding method adopting the molding device comprises the following steps:
step one, cleaning: cleaning impurities in the top cover 1, the middle support 2 and the base 3 by adopting alcohol; mainly clean up the impurity in recess and each through-hole.
Step two, cutting the prepreg tape 4: cutting the thermoplastic composite prepreg tape into long strips along the fiber direction by using a precision cutting machine, wrapping the prepreg tape 4 by using a plastic adhesive tape to form a rod-shaped structure, and cutting two ends of the prepreg tape 4 with the rod-shaped structure by using the cutting machine to enable the two ends to be consistent with the length of the first groove 12; the cutting direction of the prepreg tape 4 is ensured to be along the fiber direction, the cutting error is required to meet the precision requirement, the cutting width is not too wide, the prepreg tape is ensured to be easily wrapped into a rod body structure, and the cutting length and the number are determined after calculation according to the size of the rod body. The plastic adhesive tape is prior art.
Step three, mounting the middle support 2 and the base 3: the middle support 2 is fixed on the base 3 through a fixing bolt 5;
step four, installing the top cover 1: pressing the prepreg tape 4 with the rod-shaped structure into the first groove 12 on the base 3 along the limiting through hole 10, then inserting the bump structure 11 on the top cover 1 into the limiting through hole 10 to ensure that the first groove 12 is butted with the second groove 13 and is tightly contacted with the prepreg tape 4, and finishing the installation of the molding device;
step five, heating: placing the installed forming device in an oven, setting the heating temperature and time, and simultaneously placing a pressing block on the top cover 1 to ensure that the second groove 13 extrudes the prepreg tape 4 to form a uniform and compact rod body after the thermoplastic resin in the prepreg tape 4 is melted; the briquettes, which mainly perform the compaction function, may be iron briquettes of a certain weight, with the purpose of discharging bubbles generated in the melting of the thermoplastic resin. The heating temperature and the heating time are determined according to the melting temperature of the thermoplastic resin prepreg tape;
step six: taking out: after thermoforming, the top cover 1 is removed from the intermediate support 2, and the thermoplastic composite rod is then removed after removing the fixing bolts 5 and removing the intermediate support 2.
During the molding process, the action of pressing the prepreg tape 4 of the rod-shaped structure into the first groove 12 on the base 3 along the limiting through hole 10 and the action of pressing the prepreg tape 4 by the second groove 13 are slowly completed.
The forming method of the application utilizes the principle of thermoplastic resin heating, melting and cooling forming, the fiber prepreg tape is placed in the forming device to be heated to the temperature above the melting point temperature of the resin, and the forming process is completed in the forming device after the resin is fully melted.
The top cover 1 and the lug structure 11 at the bottom end are integrally provided with vent holes 8 in a through mode, and bubbles generated in the heating process are discharged along the vent holes 8. To produce a uniform dense thermoplastic composite rod.
The number of the exhaust holes 8 is two and symmetrically distributed at two ends of the bump structure 11.
At least two cover lifting bolts 9 are arranged on the top cover 1. Facilitating the removal of the cover 1 from the intermediate support 2 in step six.
And setting the heating temperature in the step five to be higher than the melting point temperature of the thermoplastic resin, preferably 5-10 ℃ higher than the melting point temperature of the thermoplastic resin. The design is adopted to ensure that the resin is uniformly impregnated in the fiber after being fully melted; meanwhile, the heating temperature is not too high, so as to prevent the thermoplastic resin from overflowing from the molding device due to too high fluidity.
Before installing middle support 2 and base 3, earlier fix a position middle support 2 and base 3 through two positioning bolt 6, ensure the relative position of middle support 2 and base 3, adopt earlier the centre, the order at back both ends screws up a plurality of fixing bolt 5, fix middle support 2 to base 3 on, ensure that middle support 2 aligns completely with base 3.
Claims (8)
1. The utility model provides an utilize forming device of thermoplasticity preimpregnation area preparation combined material pole which characterized in that: it includes by top to bottom arrange in proper order and top cap (1), middle support (2) and base (3) that closely laminate, wherein through a plurality of fixing bolt (5) rigid couplings between middle support (2) and base (3), rectangular form spacing through-hole (10) have been seted up along its length direction in the middle part of middle support (2), and the bottom integrated into one piece of top cap (1) has rectangular form lug structure (11), just lug structure (11) cooperation cartridge is in spacing through-hole (10), first recess (12) have been seted up along its length direction to base (3) up end, and second recess (13) have been seted up along its length direction to the lower terminal surface of lug structure (11), and first recess (12) are the round hole form with the same and butt joint of second recess (13) length.
2. The forming apparatus for making composite rods using thermoplastic prepreg tape as claimed in claim 1, wherein: the number of the fixing bolts (5) is four, and the fixing bolts are respectively distributed on two sides of the limiting through hole (10) in the length direction and two sides of the limiting through hole in the width direction.
3. A molding method using the molding apparatus according to claim 1 or 2, characterized in that: it comprises the following steps:
step one, cleaning: cleaning impurities in the top cover (1), the middle support (2) and the base (3) by adopting alcohol;
step two, cutting the prepreg tape (4): cutting the thermoplastic composite material prepreg tape into long strips along the fiber direction by using a precision cutting machine, wrapping the prepreg tape (4) by using a plastic adhesive tape to form a rod-shaped structure, and cutting two ends of the prepreg tape (4) with the rod-shaped structure by using the cutting machine to enable the length of the two ends to be consistent with that of the first groove (12);
step three, installing the middle support (2) and the base (3): the middle support (2) is fixed on the base (3) through a fixing bolt (5);
step four, mounting the top cover (1): pressing the prepreg tape (4) with the rod-shaped structure into a first groove (12) on the base (3) along a limiting through hole (10), then inserting a bump structure (11) on the top cover (1) into the limiting through hole (10) to ensure that the first groove (12) is butted with a second groove (13) and is in close contact with the prepreg tape (4) so as to complete the installation of the molding device;
step five, heating: placing the installed forming device in an oven, setting heating temperature and time, and simultaneously placing a pressing block on the top cover (1) to ensure that the second groove (13) extrudes the prepreg tape (4) to form a uniform and compact rod body after thermoplastic resin in the prepreg tape (4) is melted;
step six: taking out: after thermoforming, the top cover (1) is taken off from the middle support (2), and then the thermoplastic composite material rod is taken out after the fixing bolt (5) is removed and the middle support (2) is disassembled.
4. The molding method according to claim 3, wherein: the top cover (1) and the lug structure (11) at the bottom end are integrally communicated with each other to form an exhaust hole (8), and bubbles generated in the heating process are exhausted along the exhaust hole (8).
5. The molding method according to claim 4, wherein: the number of the exhaust holes (8) is two, and the exhaust holes are symmetrically distributed at two ends of the lug structure (11).
6. The molding method according to claim 3, wherein: at least two cover lifting bolts (9) are arranged on the top cover (1).
7. The molding method according to claim 3, wherein: the heating temperature set in the fifth step is 5-10 ℃ higher than the melting point temperature of the thermoplastic resin.
8. The molding method according to claim 3, wherein: before installing middle support (2) and base (3), earlier fix a position middle support (2) and base (3) through two positioning bolt (6), ensure the relative position of middle support (2) and base (3), adopt earlier the centre, back both ends order screw up a plurality of fixing bolt (5), fix middle support (2) to base (3) on, ensure that middle support (2) aligns completely with base (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110720230.5A CN113442465A (en) | 2021-06-28 | 2021-06-28 | Forming device and method for preparing composite material rod by utilizing thermoplastic prepreg tape |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110720230.5A CN113442465A (en) | 2021-06-28 | 2021-06-28 | Forming device and method for preparing composite material rod by utilizing thermoplastic prepreg tape |
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| CN113442465A true CN113442465A (en) | 2021-09-28 |
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| CN202110720230.5A Pending CN113442465A (en) | 2021-06-28 | 2021-06-28 | Forming device and method for preparing composite material rod by utilizing thermoplastic prepreg tape |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114770978A (en) * | 2022-04-15 | 2022-07-22 | 哈尔滨工业大学 | Device and method for preparing composite material rib by using thermoplastic fiber reinforced resin-based prepreg tape |
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| US5638870A (en) * | 1992-03-31 | 1997-06-17 | Daiwa Seiko, Inc. | Fiber-reinforced thermoplastic tubular body |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114770978A (en) * | 2022-04-15 | 2022-07-22 | 哈尔滨工业大学 | Device and method for preparing composite material rib by using thermoplastic fiber reinforced resin-based prepreg tape |
| CN114770978B (en) * | 2022-04-15 | 2024-04-12 | 哈尔滨工业大学 | Device and method for preparing composite material rib by using thermoplastic fiber reinforced resin-based prepreg tape |
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