CN117984562A - Connection method and connection structure of carbon fiber thermoplastic composite material plates - Google Patents
Connection method and connection structure of carbon fiber thermoplastic composite material plates Download PDFInfo
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- CN117984562A CN117984562A CN202410319406.XA CN202410319406A CN117984562A CN 117984562 A CN117984562 A CN 117984562A CN 202410319406 A CN202410319406 A CN 202410319406A CN 117984562 A CN117984562 A CN 117984562A
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- composite material
- carbon fiber
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- thermoplastic composite
- welded
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- 239000002131 composite material Substances 0.000 title claims abstract description 83
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 73
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 73
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 61
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 87
- 239000000835 fiber Substances 0.000 claims abstract description 64
- 239000011229 interlayer Substances 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 229920006260 polyaryletherketone Polymers 0.000 claims abstract description 6
- 238000007711 solidification Methods 0.000 claims abstract description 4
- 230000008023 solidification Effects 0.000 claims abstract description 4
- 238000011217 control strategy Methods 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229920001643 poly(ether ketone) Polymers 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
-
- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/87—Auxiliary operations or devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention provides a connection method and a connection structure of carbon fiber thermoplastic composite plates, wherein the method comprises the following steps: preparing a vertical fiber composite material sheet by adopting carbon fiber and polyaryletherketone resin; cutting the fiber composite material sheet into a required size to obtain a vertical fiber interlayer; fixing a first carbon fiber thermoplastic composite material plate to be connected on an anvil of a welding machine, placing a vertical fiber interlayer in the center of a welding area, overlapping the area to be welded of a second carbon fiber thermoplastic composite material plate to be connected on the area to be welded of the first carbon fiber thermoplastic composite material plate, and fixing the area to be welded on the anvil; and applying welding pressure and displacement load perpendicular to the contact surface of the plate on the right upper side of the to-be-welded area of the second carbon fiber thermoplastic composite material plate by using an ultrasonic welding head, carrying out pressure maintaining solidification on the welding joint by using an electrode after welding, and unloading to finish welding. The invention improves the welding quality of ultrasonic welding of the carbon fiber thermoplastic composite material.
Description
Technical Field
The embodiment of the invention relates to the technical field of material connection and manufacturing, in particular to a connection method and a connection structure suitable for a carbon fiber thermoplastic composite material plate.
Background
Carbon fiber thermoplastic Composites (CFRP) are of great interest for use in aircraft construction because of their superior strength, stiffness, weight ratio, and cost effectiveness in manufacturing processes. However, welding of CFRP has been a technical challenge. Conventional welding methods such as laser welding, resistance welding, etc. are not suitable for welding of CFRP, and thus new welding techniques need to be sought. Ultrasonic welding is increasingly being used in the welding of CFRP as an efficient, clean, low cost welding technique. The technical principle of ultrasonic welding is mainly based on the vibration energy of ultrasonic waves. When ultrasonic waves are applied to the CFRP material, high-frequency vibrations of several tens of thousands times per second are generated, and such vibration energy is transmitted to the welding zone through the upper weldment. Since the acoustic resistance is large at the welding area, i.e. the interface of two welds, a local high temperature is generated, resulting in rapid melting of the resin at the two contact surfaces. In the melting process, after a certain pressure is applied, the two plates are fused into a whole. After the ultrasonic wave stops acting, the pressure is kept for a few seconds, so that the ultrasonic wave is solidified and formed to form a firm welding line, and the welding is completed.
In ultrasonic welding, a thin pure resin energy-guiding rib is usually placed between the contact surfaces of two plates to transfer and concentrate vibration energy, so as to improve the welding efficiency and quality.
Disclosure of Invention
Considering that thermoplastic composite material ultrasonic welding is mainly connected through the melting flow of resin matrix materials, and the connection strength is low, the invention provides a method for adding a layer of composite material structure containing vertical fibers between contact surfaces of plates and then performing ultrasonic welding, so that the vertical fibers are inserted between upper and lower plates when the resin is melted, and the tensile/peeling strength of the thermoplastic composite material ultrasonic welding joint is improved.
Specifically, the first aspect of the invention provides a connection method of carbon fiber thermoplastic composite boards, which comprises the following steps:
S1, preparing a vertical fiber composite material sheet by adopting carbon fibers and polyaryletherketone resin, wherein the fiber direction of the vertical fiber composite material sheet is parallel to the thickness direction of a carbon fiber thermoplastic composite material plate to be connected;
s2, cutting the vertical fiber composite material sheet prepared in the S1 into required sizes to obtain a vertical fiber interlayer, wherein the fibers in the vertical fiber interlayer after cutting are parallel to the thickness direction of the carbon fiber thermoplastic composite material sheet to be connected;
s3, fixing the first carbon fiber thermoplastic composite material plate to be connected on an anvil of a welding machine, placing the vertical fiber interlayer obtained in the S2 in the center of a welding area, overlapping the area to be welded of the second carbon fiber thermoplastic composite material plate to be connected on the area to be welded of the first carbon fiber thermoplastic composite material plate, and fixing the area to be welded on the anvil;
and S4, applying welding pressure and displacement load perpendicular to the contact surface of the plate to the upper part of the to-be-welded area of the second carbon fiber thermoplastic composite material plate in the step S3 by using an ultrasonic welding head, performing pressure maintaining solidification on the welding joint by using an electrode after welding, and unloading to finish welding.
As a further explanation of the present invention, the step S1 specifically includes:
S101, dipping carbon fiber bundles in polyether ketone resin to enable the resin to fully infiltrate the carbon fibers to form prepreg;
S102, laying the prepreg in one direction, and putting the prepreg into an autoclave for heating, pressurizing and forming to prepare the vertical fiber composite material sheet.
As a further illustration of the invention, the vertical fiber composite sheet prepared in S1 is cut to the desired dimensions using water-cooled diamond data in step S2.
As a further explanation of the present invention, the step S3 specifically includes:
S301, enabling a to-be-welded area of a first carbon fiber thermoplastic composite material plate to be connected to face upwards, placing the to-be-welded area under an ultrasonic welding head, and fixing the to-be-welded area on an anvil block;
S302, placing the vertical fiber interlayer obtained in the S2 in the center of a region to be welded of the first carbon fiber thermoplastic composite material plate;
s303, overlapping the to-be-welded area of the second carbon fiber thermoplastic composite material plate to be connected on the to-be-welded area of the first carbon fiber thermoplastic composite material plate downwards, and fixing the to-be-welded area on an anvil block.
As a further explanation of the invention, in step S4, a displacement control strategy is adopted in the welding process, the welding displacement is the thickness of the vertical fiber interlayer, and the welding pressure is 500N-2000N.
As a further explanation of the present invention, in step S4, the vibration amplitude of the displacement load is 25-100 um, and the load is unloaded after pressure maintaining for 4S under 1500N force.
The second aspect of the invention provides a connection structure of carbon fiber thermoplastic composite plates, wherein the connection structure is a vertical fiber composite sheet made of carbon fibers and polyaryletherketone resin, and the fiber direction of the vertical fiber composite sheet is parallel to the thickness direction of the carbon fiber thermoplastic composite plates to be connected.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
1. According to the invention, after the vertical fiber structure is used for welding instead of the energy guide rib, the tensile strength/peeling strength of the carbon fiber thermoplastic composite material is obviously improved, and the welding quality of ultrasonic welding of the carbon fiber thermoplastic composite material is better improved.
2. Compared with the traditional energy-guiding rib welding, the invention has no obvious difficulty in material manufacture and no increase of workload before welding, but has obvious improvement on welding strength.
Drawings
For a clearer description of the technical solutions of embodiments of the present invention, reference will be made to the accompanying drawings of embodiments, which are to be understood as being only related to some embodiments of the present invention, and not limiting thereof, wherein:
FIG. 1 is a schematic view of a vertical fiber sandwich structure according to an embodiment of the invention.
Fig. 2 is a schematic diagram of ultrasonic welding according to an embodiment of the present invention.
In the figure:
1-a servo device; 2-an ultrasonic electrode; 3-a first carbon fiber thermoplastic composite sheet; 4-externally connecting an ultrasonic signal source; 5-anvil; 6-vertical fiber interlayers; 61-carbon fiber; 7-a second carbon fiber thermoplastic composite sheet; 8-thin plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without creative efforts, based on the described embodiments of the present invention also fall within the protection scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
At present, in ultrasonic welding of thermoplastic composite materials, a method for enhancing welding quality mainly applies a resin film which is the same as a resin matrix of a plate to be made into energy-guiding ribs and is placed between welding interfaces to improve welding quality, and the principle is that an ultrasonic welding head applies high-frequency vibration to workpieces to cause materials (mainly resin) to generate friction heat, melt and flow to finally solidify together to realize welding.
The invention mainly utilizes the characteristic that the strength of the carbon fiber is obviously higher than that of the resin, and the welding quality of ultrasonic welding is improved by placing the vertical fiber interlayer in the middle of the welding plate. The vertical fiber interlayer is composed of the same resin matrix and fibers as the plates to be welded, and the fiber direction is vertical to the plates. When ultrasonic welding is carried out, the sandwich structure and the upper and lower welding surfaces are melted by welding, so that vertical fibers are inserted into the melting area of the plate, and the bearing capacity of the welded joint is improved.
The technical scheme of the invention is specifically described as follows:
the embodiment of the invention provides a connection method of carbon fiber thermoplastic composite plates, which comprises the following steps:
s1, preparing a vertical fiber composite material sheet by adopting carbon fibers and polyaryletherketone resin (paek), wherein the fiber direction of the vertical fiber composite material sheet is parallel to the thickness direction of a carbon fiber thermoplastic composite material plate to be connected;
S2, cutting the fiber composite material sheet prepared in the S1 into required sizes to obtain a vertical fiber interlayer, wherein the structural schematic diagram of the vertical fiber interlayer is shown in the figure 1, and the fibers in the cut vertical fiber interlayer are parallel to the thickness direction of the carbon fiber thermoplastic composite material sheet to be connected;
S3, fixing the first carbon fiber thermoplastic composite material plate to be connected on an anvil of a welding machine, placing the vertical fiber interlayer obtained in the S2 in the center of a welding area, overlapping the area to be welded of the second carbon fiber thermoplastic composite material plate to be connected on the area to be welded of the first carbon fiber thermoplastic composite material plate, and fixing the area to be welded on the anvil;
And S4, applying welding pressure and displacement load perpendicular to the contact surface of the plate to be welded on the upper side of the region to be welded of the second carbon fiber thermoplastic composite material plate in the step S3 by using an ultrasonic welding head, carrying out pressure maintaining solidification on the welding joint by using an electrode after welding, and unloading to finish welding.
Specifically, step S1 is as follows:
S101, dipping carbon fiber bundles in polyether ketone resin to enable the resin to fully infiltrate the carbon fibers to form prepreg;
S102, laying the prepreg in one direction, and placing the prepreg into an autoclave for heating, pressurizing and forming to prepare the vertical fiber composite material sheet.
Specifically, the vertical fiber composite sheet prepared in S1 is cut to a desired size using water-cooled diamond data in step S2.
Specifically, step S3 is as follows:
S301, enabling a to-be-welded area of a first carbon fiber thermoplastic composite material plate to be connected to face upwards, placing the to-be-welded area under an ultrasonic welding head, and fixing the to-be-welded area on an anvil block;
S302, placing the vertical fiber interlayer obtained in the S2 in the center of a region to be welded of the first carbon fiber thermoplastic composite material plate;
S303, overlapping the to-be-welded area of the second carbon fiber thermoplastic composite material plate to be connected on the to-be-welded area of the first carbon fiber thermoplastic composite material plate downwards, and fixing the to-be-welded area on the anvil.
The ultrasonic welding schematic diagram is shown in fig. 2, wherein an ultrasonic electrode 2 is installed below a servo device 1 and is connected with an external ultrasonic signal source 4, so that a region to be welded of a first carbon fiber thermoplastic composite material plate 3 faces upwards, then the ultrasonic welding schematic diagram is fixed on an anvil 5, a vertical fiber interlayer 6 is placed at the center of the region to be welded of the first carbon fiber thermoplastic composite material plate 3, and a region to be welded of a second carbon fiber thermoplastic composite material plate 7 is lapped downwards at the region to be welded of the first carbon fiber thermoplastic composite material plate 3. The anvil 5 is further provided with a thin plate 8, and the thin plate 8 can support the second carbon fiber thermoplastic composite material plate 7, so that the welding surface of the first carbon fiber thermoplastic composite material plate 3 and the second carbon fiber thermoplastic composite material plate 7 keeps good parallelism before the electrodes are contacted.
Specifically, in step S4, a displacement control strategy is adopted in the welding process, the welding displacement is the thickness of the vertical fiber interlayer, and the welding pressure is 500 n-2000 n.
Specifically, in step S4, the vibration amplitude of the displacement load is 25-100 um, and the displacement load is unloaded after pressure maintaining for 4S under the force of 1500N.
The invention adopts a novel CFRP ultrasonic welding structure, which comprises a carbon fiber laminated plate and a vertical fiber interlayer. Vertical fibers are placed between the contact surfaces of the overlap areas to improve the quality of the ultrasonic weld. The vertical fiber interlayer is composed of the same resin matrix and fibers as the plates to be welded, and the fiber direction is vertical to the contact surface of the plates. When ultrasonic welding is carried out, resin on the sandwich structure and the upper and lower welding surfaces is melted through welding, so that vertical fibers are inserted into a melting area of the plate, and the bearing capacity of the welded joint is improved.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. The connection method of the carbon fiber thermoplastic composite material plate is characterized by comprising the following steps of:
S1, preparing a vertical fiber composite material sheet by adopting carbon fibers and polyaryletherketone resin, wherein the fiber direction of the vertical fiber composite material sheet is parallel to the thickness direction of a carbon fiber thermoplastic composite material plate to be connected;
s2, cutting the vertical fiber composite material sheet prepared in the S1 into required sizes to obtain a vertical fiber interlayer, wherein the fibers in the vertical fiber interlayer after cutting are parallel to the thickness direction of the carbon fiber thermoplastic composite material sheet to be connected;
s3, fixing the first carbon fiber thermoplastic composite material plate to be connected on an anvil of a welding machine, placing the vertical fiber interlayer obtained in the S2 in the center of a welding area, overlapping the area to be welded of the second carbon fiber thermoplastic composite material plate to be connected on the area to be welded of the first carbon fiber thermoplastic composite material plate, and fixing the area to be welded on the anvil;
and S4, applying welding pressure and displacement load perpendicular to the contact surface of the plate to the upper part of the to-be-welded area of the second carbon fiber thermoplastic composite material plate in the step S3 by using an ultrasonic welding head, performing pressure maintaining solidification on the welding joint by using an electrode after welding, and unloading to finish welding.
2. The method according to claim 1, wherein the step S1 is specifically:
S101, dipping carbon fiber bundles in polyether ketone resin to enable the resin to fully infiltrate the carbon fibers to form prepreg;
S102, laying the prepreg in one direction, and putting the prepreg into an autoclave for heating, pressurizing and forming to prepare the vertical fiber composite material sheet.
3. The method according to claim 1, wherein the vertical fiber composite sheet prepared in S1 is cut to a desired size using water-cooled diamond data in step S2.
4. The method according to claim 1, wherein the step S3 is specifically:
S301, enabling a to-be-welded area of a first carbon fiber thermoplastic composite material plate to be connected to face upwards, placing the to-be-welded area under an ultrasonic welding head, and fixing the to-be-welded area on an anvil block;
S302, placing the vertical fiber interlayer obtained in the S2 in the center of a region to be welded of the first carbon fiber thermoplastic composite material plate;
s303, overlapping the to-be-welded area of the second carbon fiber thermoplastic composite material plate to be connected on the to-be-welded area of the first carbon fiber thermoplastic composite material plate downwards, and fixing the to-be-welded area on an anvil block.
5. The method according to claim 1, wherein in step S4, a displacement control strategy is adopted in the welding process, the welding displacement is the thickness of the vertical fiber interlayer, and the welding pressure is 500 n-2000 n.
6. The method according to claim 1, wherein in step S4, the vibration amplitude of the displacement load is 25 to 100um, and the displacement load is unloaded after holding the pressure for 4S under a force of 1500N.
7. The connecting structure of the carbon fiber thermoplastic composite material plate is characterized in that the connecting structure is a vertical fiber composite material sheet made of carbon fibers and polyaryletherketone resin, and the fiber direction of the vertical fiber composite material sheet is parallel to the thickness direction of the carbon fiber thermoplastic composite material plate to be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410319406.XA CN117984562A (en) | 2024-03-20 | 2024-03-20 | Connection method and connection structure of carbon fiber thermoplastic composite material plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410319406.XA CN117984562A (en) | 2024-03-20 | 2024-03-20 | Connection method and connection structure of carbon fiber thermoplastic composite material plates |
Publications (1)
| Publication Number | Publication Date |
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| CN117984562A true CN117984562A (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410319406.XA Pending CN117984562A (en) | 2024-03-20 | 2024-03-20 | Connection method and connection structure of carbon fiber thermoplastic composite material plates |
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| CN (1) | CN117984562A (en) |
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- 2024-03-20 CN CN202410319406.XA patent/CN117984562A/en active Pending
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