CN116141686A - Ultrasonic composite rivet welding method for continuous fiber reinforced thermoplastic composite material and metal - Google Patents

Abstract

The invention discloses an ultrasonic composite rivet welding method for a continuous fiber reinforced thermoplastic composite material and metal, which comprises the steps of adopting surface laser material increasing and decreasing processing to a metal plate before welding, forming grooves and spike protrusions on the surface of the metal plate, and realizing high processing efficiency; the method has the advantages that the method combines the advantages of ultrasonic welding and self-fluxing riveting, has better comprehensive characteristics of tensile shearing resistance, stripping resistance, torsion resistance and the like, greatly improves the welding quality of composite materials and metal dissimilar materials, is efficient, quick and low in cost, and solves the problem that the prior metal-fiber reinforced thermoplastic composite material connection field lacks a connection technology with wide applicability.

Description

Ultrasonic composite rivet welding method for continuous fiber reinforced thermoplastic composite material and metal

Technical Field

The invention belongs to the technical field of dissimilar material connection, and particularly relates to an ultrasonic composite rivet welding method for a continuous fiber reinforced thermoplastic composite material and metal.

Background

The fiber reinforced thermoplastic composite material has the advantages of light weight, high modulus, high strength, designability, high temperature resistance, excellent thermal stability, fatigue resistance, corrosion resistance, good manufacturability and the like, and is widely applied to various structures of systems of missiles, rockets, satellites, spacecraft and the like. Among them, long fibers and continuous fibers have better mechanical and thermal conductivity properties, and from the application point of view, the requirement of the integrated manufacturing process is met, and the high-performance composite material is usually manufactured by continuous carbon fibers.

While fiber reinforced composites have many advantages, strength, durability and stiffness at high temperatures are somewhat weaker than conventional metallic materials. Just as metals have the advantages that these fiber reinforced composites do not, metals cannot be completely replaced by composites, which also suggests that the joining technology of hybrid metal-composite structures requires further investigation.

The differences in thermal, chemical and mechanical properties of the dissimilar materials complicate the joining of these dissimilar combinations. The connection between metal and fiber reinforced composites is traditionally made by bonding the composite joints using adhesives, mechanical rivets (e.g., rivets and bolts), and hybrid bolts. However, the adhesive joints are susceptible to thermal degradation due to moisture, humidity, and high temperature. The joint is difficult to disassemble and, as it is an irreversible process, it can lead to material damage. While bolting still suffers from a number of drawbacks such as stress concentrations in the fastener holes, and undesirable damage to the joint from delamination and micro-buckling due to drilling, which can reduce the strength and performance of the joint. Welding techniques can solve the bonding and mechanical connection problems. It facilitates mass production of the connection joint between metal and composite material. However, the search for an optimal process for joining metals and composites remains to be explored.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an ultrasonic composite rivet welding method for continuous fiber reinforced thermoplastic composite materials and metals, which combines the advantages of riveting and ultrasonic welding, realizes high efficiency, energy saving, rapidness, low cost, high strength, high quality, excellent tensile shear, stripping resistance and torsion resistance, attractive joint and easy production and control of dissimilar materials, and is used for solving the technical problem of low connection applicability of metal-fiber reinforced thermoplastic composite materials.

The invention adopts the following technical scheme:

an ultrasonic composite rivet welding method for a continuous fiber reinforced thermoplastic composite material and metal comprises the following steps:

s1, performing thermal puncture treatment on a thermoplastic composite material plate, performing surface laser metal increasing and decreasing material processing treatment on a metal plate, and then drilling a hole in the center of a welding area of the metal plate;

s2, carrying out ultrasonic composite rivet welding on the thermoplastic composite material plate obtained in the step S1 and the metal plate, and realizing composite rivet welding through resin melting, spike protrusion pinning and rivet riveting.

Specifically, in step S1, the thermal piercing of the thermoplastic composite sheet is specifically:

and (3) cleaning the thermoplastic composite material plate by using alcohol, airing, and then placing the thermoplastic composite material plate in a temperature control box at 130-150 ℃ for puncturing.

Further, the matrix of the thermoplastic composite sheet comprises polyethylene, polyetheretherketone, polyphenylene sulfide, polyethylene terephthalate.

Specifically, in step S1, the laser metal increasing/decreasing material processing specifically includes:

under the condition of not paving powder, processing a groove on the surface of the metal plate by utilizing a laser beam; and then printing and forming the spike protrusions on the metal plate under the condition of powder spreading.

Further, the groove is of an S-shaped structure.

Further, before the laser metal increasing and decreasing material processing, the metal plate is subjected to acid washing or alkali washing.

Specifically, in step S1, the surface of the metal plate is provided with phosphate or graphite.

Specifically, in step S1, a stepped hole is drilled in the center of the welded area of the metal plate.

Specifically, in step S2, a thermoplastic composite plate is placed above a metal plate, then the thermoplastic composite plate and the metal plate are fixed, holes in the thermoplastic composite plate and the metal plate are overlapped, a rivet is arranged between a welding head and the upper surface of a piece to be welded and is placed in the overlapped holes, then an ultrasonic welding head is started, and a workpiece is cooled under the action of welding pressure after vibration is completed, so that welding is completed.

Further, in the rivet region, ultrasonic vibration and welding pressure melt the composite rivet, and self-melting rivet welding is completed after cooling; outside the rivet area, the thermoplastic composite material plate and the metal plate generate interface friction under the action of ultrasonic vibration, interface resin is melted and flows into a groove on the surface of the metal plate under the action of welding pressure, and mechanical interlocking is realized after cooling; meanwhile, the spike protrusions formed on the metal surface are inserted into the woven carbon fiber structure of the thermoplastic composite material plate, and mechanical anchoring is realized after cooling.

Compared with the prior art, the invention has at least the following beneficial effects:

the ultrasonic composite rivet welding method for the continuous fiber reinforced thermoplastic composite material and the metal uses the material combination of the continuous fiber reinforced thermoplastic composite material and the metal, and has excellent mechanical properties, and compared with a short fiber reinforced or fiber-free reinforced composite material connecting process, the ultrasonic composite rivet welding method has the advantages of nature; in the metal plate processing process, surface laser metal material increasing and decreasing processing is adopted, grooves and spike protrusions are processed simultaneously on one process, the processing efficiency is high, the cost is saved, the advantages of ultrasonic welding and self-fluxing riveting are integrated, the efficiency is high, the speed is high, the cost is low, the strength is high, the quality is good, the joint is attractive, and the automatic production and control are easy to carry out; compared with the independent connecting process, the method has better performances of tensile shear resistance, stripping resistance and torsion resistance.

Further, in the process of puncturing the thermoplastic composite material plate, the technology of integral heating and needle puncturing is adopted, the woven fibers are pulled out in the process of puncturing, the damage to the fiber structure in the thermoplastic composite material plate is less, and the influence of ultrasonic composite rivet welding on the performance of the fiber reinforced thermoplastic composite material plate can be reduced as much as possible.

Further, the matrix is a thermoplastic polymer material, can be repeatedly heated and melted, can flow after being softened at a high temperature, and has the volume fraction of carbon fiber of 20-60%, and comprises but is not limited to polymers such as polyethylene, polyether ether ketone, polyphenylene sulfide, polyethylene terephthalate and the like, so as to meet the requirement of matrix fusion in ultrasonic welding; meanwhile, the fiber reinforced composite material plate manufactured by the matrixes has excellent physical properties, good corrosion resistance, ageing resistance and the like.

Furthermore, when the surface treatment is carried out on the metal, a surface laser metal material increasing and decreasing treatment mode is adopted, through program design, under the condition of not paving powder, a groove is processed on the surface of the metal plate by utilizing a laser beam, then under the condition of paving powder, the spike protrusion is printed and formed on the metal plate, and the groove and the spike protrusion are processed simultaneously in one process, so that the processing efficiency is high, and the cost is saved.

Furthermore, under the condition of not paving powder, the grooves machined on the metal surface by utilizing the laser beam are arranged in an S shape, so that the occupied area is more than that of the linear micro grooves, more resin can be adhered in the welding process, and the purpose of increasing mechanical interlocking is achieved.

Further, the surface oxide layer can be removed by acid washing or alkali washing, so that the subsequent processing is easier.

Furthermore, the surface of the metal plate is provided with coating materials such as phosphate, graphite and the like, so that the absorptivity of the metal plate to laser is improved, and the difficulty in machining of metal increasing and decreasing materials is reduced.

Further, when drilling, considering that the metal plate is positioned at the lower position in the welding process, the stepped holes are adopted to prevent the rivet from loosening.

Furthermore, the welding process adopts the arrangement of the composite material plate at the upper and lower positions of the metal plates, so that the ultrasonic welding head and the metal plates can be prevented from directly contacting in the vibration process, welding equipment is protected, and the service life of the machine is prolonged. When the rivet is fixed, the holes of the thermoplastic composite material plate and the metal plate are overlapped, positioning of the rivet is facilitated, and the rivet is prevented from falling out due to too severe vibration in the vibration process. After vibration, the workpiece needs to be cooled under the welding pressure, which is beneficial to completely filling the coincident holes/metal surface grooves by the molten rivet/thermoplastic composite material matrix, and is beneficial to better inserting the spike protrusions on the metal surface into the woven fibers, so that better welding effect is generated.

Further, self-fusion rivet welding is realized by utilizing melting and resolidification of rivets in a rivet riveting area, a thermoplastic composite material matrix is melted in a non-rivet riveting area, mechanical locking is realized by resin melting and resolidification, mechanical anchoring is realized by inserting spike protrusions into woven fibers, and the advantages of ultrasonic welding and self-fusion riveting are integrated.

In conclusion, the method has the characteristics of better tensile shear resistance, peeling resistance and torsion resistance, greatly improves the welding quality of the composite material and the metal dissimilar material, has the characteristics of high efficiency, rapidness and low cost, and solves the problem that the prior art of connecting the metal-fiber reinforced thermoplastic composite material lacks a connecting technology with wide applicability.

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Drawings

FIG. 1 is a schematic general flow diagram of the present invention;

FIG. 2 is a schematic view of a surface laser metal stock removal processing for a metal sheet;

FIG. 3 is a schematic illustration of a thermal penetration process for a composite sheet;

FIG. 4 is a schematic illustration of self-fluxing rivet welding, mechanical interlocking, mechanical anchoring formed during ultrasonic rivet welding;

FIG. 5 is a schematic view of the morphology and connection completion obtained by pretreatment of an aluminum plate and a thermoplastic composite plate.

Wherein: 21. a groove; 22. a spike protrusion; 23. a stepped hole; 31. a hot piercing punch; 32. a needle; 33. a compression bolt; 34. a clamp is arranged; 35. a thermoplastic composite sheet; 36. an anvil block; 37. an environmental box; 41. self-fluxing rivet welding; 42. mechanically anchoring; 43. and mechanically interlocking.

Detailed Description

The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the present invention, all embodiments and preferred methods of implementation mentioned herein may be combined with each other to form new solutions, unless otherwise specified.

In the present invention, all technical features mentioned herein and preferred features may be combined with each other to form new technical solutions, unless otherwise specified.

In the present invention, the percentage (%) or parts refer to weight percentage or parts by weight relative to the composition unless otherwise specified.

In the present invention, the components or preferred components thereof may be combined with each other to form a new technical solution, unless otherwise specified.

In the present invention, unless otherwise indicated, the numerical ranges "a-b" represent shorthand representations of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "6-22" means that all real numbers between "6-22" have been listed throughout, and "6-22" is only a shorthand representation of a combination of these values.

The "range" disclosed herein may take the form of a lower limit and an upper limit, which may be one or more lower limits and one or more upper limits, respectively.

In the present invention, the term "and/or" as used herein refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

In the present invention, each reaction or operation step may be performed sequentially or sequentially unless otherwise indicated. Preferably, the reaction processes herein are performed sequentially.

Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any method or material similar or equivalent to those described may be used in the present invention.

The invention provides an ultrasonic composite rivet welding method of a continuous fiber reinforced thermoplastic composite material and metal, which aims at the processing treatment of surface laser increasing and decreasing materials of a metal plate, and forms grooves and spike protrusions on the surface of the metal plate, so that the processing efficiency is high; the thermal puncture technology is adopted for the thermoplastic composite material plate, so that the influence on the woven fibers is small; the method has the advantages that the two plates are connected through ultrasonic composite rivet welding, the advantages of ultrasonic welding and self-fluxing riveting are combined, the method has better comprehensive characteristics of tensile shearing resistance, peeling resistance, torsion resistance and the like, the welding quality of composite materials and metal dissimilar materials is greatly improved, and the method is efficient, quick and low in cost, and solves the problem that the existing metal-fiber reinforced thermoplastic composite material connection field lacks a connection technology with wide applicability.

Referring to fig. 1, the ultrasonic composite rivet welding method of the continuous fiber reinforced thermoplastic composite material and metal of the invention comprises the following steps:

s1, carrying out surface treatment and punching on a metal plate before ultrasonic rivet welding, and forming a central round hole, a surface spike protrusion 22 and a groove 21 on the metal plate; surface cleaning and hot piercing are carried out on the thermoplastic composite material plate 35, oil stains on the surface of the plate are washed away, and a central round hole is formed;

s101, performing thermal puncture on a thermoplastic composite material plate;

referring to fig. 3, the surface cleaning and thermal penetration 11 of the thermoplastic composite sheet 35 is specifically:

the thermoplastic composite material plate 35 is cleaned by alcohol, air-dried, and then placed in a temperature control box with the temperature stabilized at 130-150 ℃ for puncture by a puncture machine.

The matrix in the thermoplastic composite material plate 35 is a thermoplastic polymer material, can be repeatedly heated and melted, and can flow after being softened at high temperature, and the matrix comprises polymers such as polyethylene, polyether ether ketone, polyphenylene sulfide, polyethylene terephthalate and the like, but is not limited to the polymers, so that the requirement of melting and fusing the matrix during ultrasonic welding is met; the reinforced fiber is excellent carbon fiber for reinforcing the physical performance of the composite board, and improving the corrosion resistance, ageing resistance and the like.

The purpose of the alcohol washing is to wash off the greasy dirt on the surface of the board.

In the environment box 37, place thermoplastic composite material board 35 on anvil 36, thermoplastic composite material board 35's upside both ends are provided with anchor clamps 34 respectively, upward anchor clamps 34's both ends pass through hold-down bolt 33 fastening connection respectively, hot puncture drift 31 sets up in thermoplastic composite material board 35's top, the perforation mould of hot puncture drift 31 is the syringe needle 32 of diameter 3mm, the through-hole that forms owing to the influence of puncture forms the funnel-shaped recess on thermoplastic composite material board 35 the one end that keeps away from the welding interface, compare in traditional machining's trompil mode, this puncture mode heat has softened the resin matrix material, utilize specially designed perforating device and anchor clamps device to perforate, dial the braided fiber in the perforation in-process, furthest reduces the damage to carbon fiber.

S102, material increasing and decreasing treatment on surface of metal plate

The surface treatment and punching of the metal plate are specifically as follows:

the contact surface of the metal plate and the thermoplastic composite plate 35 is subjected to acid washing or alkali washing, then the surface laser metal increasing or decreasing material processing 12 is performed on the interface of the contact surface after the treatment, and finally a drilling machine is used for drilling in the center of the welding area.

The metal plate is metal with higher absorption efficiency on laser, such as stainless steel, aluminum and the like, and meanwhile, the surface of the metal plate can be provided with coating materials such as phosphate, graphite and the like to improve the absorptivity of the metal plate on the laser so as to reduce the difficulty of metal material increasing and decreasing processing.

The purpose of the acid or alkali washing is to remove the surface oxide layer, so that the subsequent processing is easier.

Referring to fig. 2, the laser metal increasing/decreasing processing on the surface of the metal plate specifically includes:

controlling the laser etching and selective laser material adding sequence of a metal 3D printer, and processing an S-shaped groove 21 on the metal surface by utilizing a laser beam under the condition of not laying powder; the spiked protrusions 22 are then formed on the metal plate using a metal laser 3D printing process with powder lay-up, with the aim of achieving anchoring in the composite material using the convex morphology of the pins.

In the drilling, the stepped hole 23 is used in the shape of the hole in order to prevent the rivet from loosening, considering that the metal plate is positioned at the lower position during the welding process.

S2, performing ultrasonic composite rivet welding on the thermoplastic composite material plate obtained in the step S1 and the metal plate, and realizing mechanical interlocking through resin melting.

And (2) placing the thermoplastic composite material plate 35 obtained in the step (S1) above a metal plate, then fixing the thermoplastic composite material plate 35 and the metal plate on a welding table of an ultrasonic welding machine, overlapping holes on the thermoplastic composite material plate 35 and the metal plate, placing a rivet between a welding head and the upper surface of a piece to be welded, and placing the rivet in the overlapped holes, and realizing self-melting rivet welding 41 of the composite material rivet through ultrasonic vibration and welding pressure.

Referring to fig. 4 and 5, in the welding process, in the riveting area, high-frequency ultrasonic vibration and welding pressure are applied to the composite rivet to raise the temperature and melt the rivet, so that holes of the composite plate and the metal plate are completely filled under the action of the welding pressure, and self-melting rivet welding 41 of the composite rivet is realized;

in the non-welding area, the thermoplastic composite material plate 35 and the metal plate generate interface friction under the action of ultrasonic vibration, the local temperature is increased, the interface resin is melted, and the interface resin flows into the groove 21 on the surface of the metal plate under the action of welding pressure, so that mechanical interlocking 43 is realized; at the same time, the metal surface-formed spike protrusions 22 are inserted into the woven carbon fiber structure of the thermoplastic composite material plate 35, achieving mechanical anchoring 42.

For the purpose of making 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 in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the invention, the continuous carbon fiber reinforced polycarbonate composite plates with the length of 101.6mm, the width of 25.4mm and the thickness of 2mm are used in the embodiment 1 and the embodiment 2, wherein the volume fraction of the carbon fiber is 40%; the metal plate material used in example 1 was 7Cr17, and the metal plate material used in example 2 was Al6061.

Example 1

The invention discloses an ultrasonic composite rivet welding process for a continuous fiber reinforced thermoplastic composite material and metal, which comprises the following steps:

the metal selected in this embodiment is

And carrying out surface treatment and punching on the stainless steel plate before ultrasonic rivet welding. The side to be contacted with the thermoplastic composite sheet is subjected to acid or alkali washing to remove the surface oxide layer, making the subsequent processing easier. After the surface treatment, the stainless steel plate was fixed in an SLM selective laser sintering 3D printer of UN250M model, which melts and connects the metal powder together using a high density laser based on selective laser melting. Through programming design, firstly, laser etching is carried out on the surface of the stainless steel plate by using a laser beam under the condition of not laying powder, so as to form an S-shaped micro groove shown in figure 2; then, laser sintering 3D printing is performed on the surface of the stainless steel plate with a laser beam under the condition of laying powder, so that the spike protrusions as shown in fig. 2 are formed. Thereafter, the stainless steel plate was drilled using a drill press, to obtain a stepped hole shown in fig. 2.

The composite plate is cleaned by alcohol, and is fixed on the base of the environment box shown in fig. 3 after the composite plate is completely air-dried, the temperature of the temperature control box is required to be stabilized at 130-150 ℃, and the matrix of the composite plate is softened by heating at the temperature. The perforating die of the puncture machine is a long needle with the diameter of 3mm, and under the action of the puncture pressure, the hot puncture needle pierces the composite material plate, and the woven fibers are pulled out in the puncturing process to form a funnel-shaped through hole.

And respectively fixing the composite material plate and the stainless steel plate obtained in the previous two steps on a welding table according to the sequence from top to bottom, so that holes formed in the two steps in the pretreatment are overlapped, and the short fiber reinforced thermoplastic composite material rivet is arranged in the overlapped holes. In the rivet welding area, self-melting rivet welding of the composite rivet is realized through ultrasonic vibration and welding pressure. In the welding process, high-frequency ultrasonic vibration and larger welding pressure act on the composite rivet in a riveting area to raise the temperature of the composite rivet and melt the composite rivet, and holes of the composite plate and the stainless steel plate are completely filled under the action of the welding pressure, so that self-fluxing rivet welding is realized. In a non-welding area, the composite material plate and the stainless steel plate generate interface friction under the action of ultrasonic vibration, the local temperature is increased, interface resin is melted, and the interface resin flows into a groove on the surface of the stainless steel plate under the action of welding pressure, so that mechanical interlocking is realized; meanwhile, the spike protrusions formed on the surface of the stainless steel can be inserted into the woven carbon fiber structure of the composite material plate, so that an anchoring effect is realized.

Example 2

The invention discloses an ultrasonic composite rivet welding process for a continuous fiber reinforced thermoplastic composite material and metal, which comprises the following steps:

the metal selected in this embodiment is Al6061, and compared with stainless steel, the Al6061 has a smaller utilization ratio of laser energy, and the laser generator power needs to be increased in the processing process of increasing or decreasing the laser material on the metal surface.

And carrying out surface treatment and punching on the aluminum plate before ultrasonic rivet welding. The side to be contacted with the thermoplastic composite sheet is subjected to acid or alkali washing to remove the surface oxide layer, making the subsequent processing easier. After the surface treatment, the aluminum plate was fixed in an SLM selective laser sintering 3D printer of UN250M model, which was based on selective laser melting, using a high density laser to melt and join the metal powders together. Through programming design, firstly, carrying out laser etching on the surface of an aluminum plate by using a laser beam under the condition of not paving powder, so as to form an S-shaped micro groove shown in fig. 2; then, laser sintering 3D printing is performed on the surface of the aluminum plate by using a laser beam under the condition of powder spreading, so that the spike protrusions as shown in fig. 2 are formed. Then, the aluminum plate was drilled using a drill press to obtain a countersunk hole shown in fig. 5.

The composite plate is cleaned by alcohol, and is fixed on the base of the environment box shown in fig. 3 after the composite plate is completely air-dried, the temperature of the temperature control box is required to be stabilized at 130-150 ℃, and the matrix of the composite plate is softened by heating at the temperature. The perforating die of the puncture machine is a long needle with the diameter of 3mm, and under the action of the puncture pressure, the hot puncture needle pierces the composite material plate, and the woven fibers are pulled out in the puncturing process, so that the funnel-shaped through hole shown in fig. 5 is formed.

And respectively fixing the composite material plate and the metal plate obtained in the previous two steps on a welding table according to the sequence from top to bottom, so that holes formed in the two steps in the pretreatment are overlapped, and a short fiber reinforced thermoplastic composite material rivet is arranged in the overlapped holes. In the rivet welding area, self-melting rivet welding of the composite rivet is realized through ultrasonic vibration and welding pressure. In the welding process, high-frequency ultrasonic vibration and larger welding pressure act on the composite rivet in a riveting area to raise the temperature of the composite rivet and melt the rivet, so that holes of the composite plate and the metal plate are completely filled under the action of the welding pressure, and self-fluxing rivet welding is realized. In the non-welding area, the composite material plate and the metal plate generate interface friction under the action of ultrasonic vibration, the local temperature is increased, interface resin is melted, and the interface resin flows into a groove on the surface of the metal plate under the action of welding pressure, so that mechanical interlocking is realized; meanwhile, the spike protrusions formed on the metal surface can be inserted into the woven carbon fiber structure of the composite material plate, so that an anchoring effect is achieved.

In summary, according to the ultrasonic composite rivet welding method for the continuous fiber reinforced thermoplastic composite material and the metal, the composite material plate and the metal plate are respectively subjected to the welding pretreatment, the two plates are respectively molded into the special structures, and finally the two plates are connected through the ultrasonic composite rivet welding. The invention provides two different material combinations and pretreatment modes for respectively completing the connection between the continuous fiber reinforced thermoplastic composite material plate and the metal plate, has the advantages of high efficiency, energy conservation, rapidness, low cost, high strength, high quality, excellent tensile shear, stripping resistance, torsion resistance, attractive joint and easiness in automatic production and control, and solves the problem that the prior art of connecting metal-fiber reinforced thermoplastic composite materials lacks a connection technology with wide applicability.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention 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 or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (10)

1. The ultrasonic composite rivet welding method for the continuous fiber reinforced thermoplastic composite material and the metal is characterized by comprising the following steps of:

s1, performing thermal puncture treatment on a thermoplastic composite material plate, performing surface laser metal increasing and decreasing material processing treatment on a metal plate, and then drilling a hole in the center of a welding area of the metal plate;

s2, carrying out ultrasonic composite rivet welding on the thermoplastic composite material plate obtained in the step S1 and the metal plate, and realizing composite rivet welding through resin melting, spike protrusion pinning and rivet riveting.

2. The ultrasonic composite rivet welding method of continuous fiber reinforced thermoplastic composite materials and metals according to claim 1, wherein in step S1, the thermal piercing of the thermoplastic composite material plate is specifically:

and (3) cleaning the thermoplastic composite material plate by using alcohol, airing, and then placing the thermoplastic composite material plate in a temperature control box at 130-150 ℃ for puncturing.

3. The ultrasonic composite rivet welding method of continuous fiber reinforced thermoplastic composite materials and metals according to claim 2, wherein the matrix of the thermoplastic composite material plate comprises polyethylene, polyetheretherketone, polyphenylene sulfide, polyethylene terephthalate.

4. The ultrasonic composite rivet welding method of continuous fiber reinforced thermoplastic composite materials and metals according to claim 1, wherein in step S1, the laser metal increasing and decreasing processing is specifically:

under the condition of not paving powder, processing a groove on the surface of the metal plate by utilizing a laser beam; and then printing and forming the spike protrusions on the metal plate under the condition of powder spreading.

5. The ultrasonic composite rivet welding method of continuous fiber reinforced thermoplastic composite materials and metals according to claim 4, wherein the grooves are S-shaped structures.

6. The ultrasonic composite rivet welding method for continuous fiber reinforced thermoplastic composite materials and metals according to claim 4, wherein the metal plate is subjected to acid washing or alkali washing before the laser metal increasing or decreasing material processing treatment.

7. The ultrasonic composite rivet welding method of continuous fiber reinforced thermoplastic composite materials and metals according to claim 1, wherein in step S1, the surface of the metal plate is provided with phosphate or graphite.

8. The ultrasonic composite rivet welding method of continuous fiber reinforced thermoplastic composite materials and metals according to claim 1, wherein in step S1, the center of the welded area of the metal plate is drilled into a stepped hole.

9. The ultrasonic composite rivet welding method of the continuous fiber reinforced thermoplastic composite material and the metal according to claim 1, wherein in the step S2, a thermoplastic composite material plate is placed above a metal plate, then the thermoplastic composite material plate and the metal plate are fixed, holes on the thermoplastic composite material plate and the metal plate are overlapped, a rivet is arranged between a welding head and the upper surface of a piece to be welded and is placed in the overlapped holes, then an ultrasonic welding head is started, and a workpiece is cooled under the action of welding pressure after vibration is completed, so that welding is completed.

10. The ultrasonic composite rivet welding method of the continuous fiber reinforced thermoplastic composite material and the metal according to claim 9, wherein the ultrasonic vibration and the welding pressure melt the composite rivet in the rivet area, and the self-fluxing rivet welding is completed after cooling; outside the rivet area, the thermoplastic composite material plate and the metal plate generate interface friction under the action of ultrasonic vibration, interface resin is melted and flows into a groove on the surface of the metal plate under the action of welding pressure, and mechanical interlocking is realized after cooling; meanwhile, the spike protrusions formed on the metal surface are inserted into the woven carbon fiber structure of the thermoplastic composite material plate, and mechanical anchoring is realized after cooling.

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