CN106964741B - A kind of staking clinching method between aluminium alloy plate and carbon fibre composite plate - Google Patents

Abstract

The invention discloses a riveting device between an aluminum alloy plate and a carbon fiber composite material plate, comprising: a die main body, which is a cylinder, and a first through hole is arranged at the center; , the center of the blank holder has a second through hole; the blind rivet mandrel is a cylinder; the blind rivet drill bit is a cone, and the bottom surface of the cone is integrally connected with the blind rivet mandrel, and the bottom surface of the cone The diameter is greater than the diameter of the core rod of the blind rivet; the riveting body has a nail hole in the center, and the inner diameter of the nail hole is the same as the diameter of the core rod of the blind rivet, and a kind of gap between the aluminum alloy plate and the carbon fiber composite material plate is provided. The blind riveting method improves the mechanical properties of the riveted joint between the aluminum alloy plate and the carbon fiber composite material plate in the existing blind riveting process.

Description

A riveting riveting method between an aluminum alloy plate and a carbon fiber composite material plate

technical field

The present invention relates to a riveting connection method of an aluminum alloy plate and a carbon fiber composite material plate, more specifically, the present invention relates to a method for preparing a perforated carbon fiber composite material plate and the connection between a perforated carbon fiber composite material plate and an aluminum alloy plate The riveting riveting method.

Background technique

The increasingly fierce contradiction between the development of the automobile industry and the world's energy and environmental issues has promoted the development of the concept of automobile lightweight. The high specific strength of high-strength steel and carbon fiber composite materials makes the proportion of their application in automobile bodies increase year by year, and the transformation from high-end models to mid-end models is being realized rapidly. Carbon fiber composite materials have good impact resistance and energy absorption, good fatigue resistance, and electrochemical corrosion resistance, which provides a broader space for their development in the automotive industry.

The connection of carbon fiber composite materials to other panels in automobiles usually uses adhesive bonding and mechanical bonding. Mechanical connections are suitable for joints that bear high and complex loads, and have the characteristics of easy inspection, high reliability, repeatable assembly, and insensitivity to environmental fatigue. Therefore, mechanical connections currently play a major role in the connection of composite materials. This is especially true for large and complex structures. Riveting in mechanical connection is a new type of lightweight connection technology, which is usually applied to the connection of the same metal or dissimilar metal. The plastic deformation of carbon fiber composite materials is very small during the deformation process, and the ductility is much worse than that of metal materials, which limits the application of riveting technology.

In the riveting of composite materials, it is generally forbidden to hammer the riveting with an impact riveting gun to prevent the composite material from being damaged by impact; while pressure riveting is limited by the size of large and complex parts, and can only be used in individual parts such as end frames; therefore For large composite structural parts, ring groove rivets are used for riveting.

The existing riveting process is based on pre-drilled holes. Due to the complex damage forms of carbon fiber composite materials during the drilling process, such as resin matrix damage, fiber fracture, etc., the mechanical properties of the material at the joint are seriously reduced. On the other hand, since the riveting operation is performed after the pre-drilled holes, the processing steps are increased, the connection efficiency is reduced, and the production cost is increased.

Therefore, in the existing riveting process, it is necessary to add a new process method to ensure that a good quality riveted joint is obtained during the riveting process of aluminum alloy and carbon fiber composite materials, and at the same time improve the connection efficiency by improving the original process method. The cost can be reduced on the premise of obtaining riveted parts with good performance.

Contents of the invention

The problem to be solved by the present invention is to use a special blind rivet, combined with the principle of hot-melt drilling and riveting technology, to realize single-sided riveting and improve the connection efficiency.

Still another object of the present invention is to provide a riveting method between an aluminum alloy plate and a carbon fiber composite material plate. During the riveting process, the carbon fiber composite material plate is hardly deformed, and the aluminum alloy in the existing riveting riveting process is improved. Mechanical properties of riveted joints between alloy plates and carbon fiber composite plates.

The technical scheme provided by the invention is:

A riveting device between an aluminum alloy plate and a carbon fiber composite material plate, comprising:

The main body of the die is a cylinder, and a first through hole is arranged at the center;

a blank holder, which is a cylinder, and the center of the blank holder has a second through hole;

Blind rivet mandrel, which is a cylinder;

Blind rivet drill bit, which is a cone, the bottom surface of the cone is integrally connected with the blind rivet mandrel, and the diameter of the bottom surface of the cone is larger than the diameter of the blind rivet mandrel;

The rivet body has a nail hole in its center, and the inner diameter of the nail hole is the same as the diameter of the blind rivet mandrel.

Preferably, the diameter of the first through hole is larger than the diameter of the second through hole.

Preferably, the rivet body includes:

The nail body is cylindrical;

a nail cap, which is integrally formed with the nail body, and has a larger outer diameter than the nail body;

Wherein, the center of the riveting body has a through hole.

Preferably, it also includes: a small drill bit, which is a tapered drill bit, and is arranged on the top of the blind rivet drill bit.

Preferably, the main body of the die, the blank holder, the mandrel of the blind rivet, the drill bit of the blind rivet and the rivet body are arranged coaxially.

A blind riveting method between an aluminum alloy plate and a carbon fiber composite material plate, comprising the following steps:

Step 1: First prepare a carbon fiber composite material plate with through holes;

Step 2: Place the aluminum alloy plate to be riveted and the carbon fiber composite material plate with through holes on the die, the aluminum alloy plate is on top, the carbon fiber composite material plate is on the bottom, and the blank holder is driven to move down to Press the two boards together;

Step 3: Put the collet into the tool handle, then put the blind rivet mandrel into the collet and lock it, then connect the tool handle to the drilling machine, and press down the handle at speed v;

Step 4: The special blind rivet drill bit moves down to contact with the end surface of the aluminum alloy plate. While drilling the aluminum alloy plate, the metal flows to form an aluminum alloy bushing until the special blind rivet drill reaches the bottom dead center and completely drills through the aluminum alloy plate. While forming a bush with a certain thickness;

Step 5: The collet clamps the mandrel to move upwards, generating an upward pulling force, which exerts pressure on the rivet body of the special blind rivet, and the rivet body is compressed and deformed to form the rivet head. Next riveting.

Preferably, the carbon fiber composite material plate with through holes is prepared using the following device, including:

The upper punch is a cuboid, the center of the lower surface of the upper punch is provided with a cuboid boss, and the center of the boss is provided with a combination hole;

The lower punch is a cuboid, and the center of the upper surface of the lower punch is provided with a cuboid groove, and the center of the groove has a combination column, and the combination column can go deep into the combination hole.

Preferably, the combination hole includes:

a tapered portion, which is a conical hole, and the top of the conical hole is close to the upper surface of the upper punch;

A cylindrical part, which is a cylindrical hole close to the lower surface of the upper punch, and the tapered part and the cylindrical part adopt a circular arc transition;

The combined column includes:

a conical column, which is a conical column, and the top of the conical hole is close to the upper surface of the lower punch;

A cylinder, which is cylindrical, is close to the lower surface of the lower punch, and the tapered column and the cylinder adopt a circular arc transition.

Preferably, the preparation method of the carbon fiber composite plate with through holes includes:

First, complete the prepreg process of carbon fiber cloth, cut the prepreg cloth of carbon fiber composite material, put it into the groove in the lower die, and let the weaving pores of the prepreg cloth of carbon fiber composite material pass through Lower the combined column in the die, and ensure that the carbon fiber composite material prepreg is completely laid out in the groove, and there is no gap between the bottom surface of the groove and the carbon fiber composite material prepreg;

Then, the upper punch and the lower die are combined together, and the molds formed by the upper punch and the lower punch are heated together to perform prepreg gelation;

Next, apply a certain amount of pressure to both the upper punch and the lower die when the upper punch and the lower die are combined, and increase the temperature of the assembled device while pressurizing and keep it for a period of time to complete the curing of the resin;

Finally, reduce the temperature of the device after the upper punch and the lower die are assembled, separate the upper punch and the lower die, take out the carbon fiber composite material test piece, and trim the plate to obtain a carbon fiber composite material plate with through holes.

Preferably, the formula for calculating the handle pressing speed v is:

Among them, k is a coefficient, equal to 0.67; l is the diameter of the riveting body; d ₁ is the thickness of the carbon fiber composite material plate; d ₂ is the thickness of the aluminum alloy plate, Γ ₁ is the shear strength of the carbon fiber composite material plate _; Shear strength; A is the cross-sectional area of the through hole of the carbon fiber composite plate; σ _bs is the allowable extrusion stress of the carbon fiber composite plate; σ _as is the allowable extrusion stress of the aluminum alloy plate; D is the thickness of the bushing, about 2 —3 times the thickness of the aluminum alloy plate; t is 2—2.5s

Beneficial effects of the present invention

1. In the riveting method of the aluminum alloy plate and the carbon fiber composite material plate of the present invention, a carbon fiber composite material plate with a through hole is adopted, and the plate is directly made into a through hole with the carbon fiber composite material plate during the production process of the carbon fiber composite material plate. , no pre-drilling process is required, the process steps are simplified, the process cycle is shortened, and the production cost is reduced.

2. In the riveting method of the aluminum alloy plate and the carbon fiber composite material plate of the present invention, the carbon fiber composite material plate with a through hole is adopted, and the carbon fiber composite material plate is hardly deformed during the riveting process, which avoids the carbon fiber composite material plate The pre-drilling process causes damages such as matrix cracking and fiber breakage of the plate, which ensures the mechanical properties of the material at the riveted joint.

3. In the riveting method of aluminum alloy plate and carbon fiber composite material plate according to the present invention, special blind rivets are used, combined with the principle of hot-melt drilling and riveting technology, single-sided riveting can be realized without being limited by the size of the parts, and one time Processing and forming reduces the pre-drilling process of the metal plate in the traditional riveting process and improves the connection efficiency.

4. The principle of hot-melt drilling is applied in the riveting method of aluminum alloy plate and carbon fiber composite material plate according to the present invention. Hot-melt drilling is a chip-free processing technology for processing holes and bushings on a metal sheet without special equipment. Ordinary drilling machine, milling machine or CNC machining center CNC can be used. Accurate drilling, long service life, easy to realize industrial automation production.

Description of drawings

Fig. 1 is the flow chart of carbon fiber composite molding process of the present invention;

Fig. 2 is the full cross-sectional view of the mold used in the preparation of the carbon fiber composite material plate with through holes according to the present invention;

Fig. 3 is the axonometric projection view of the upper punch structure in the mold used to prepare the carbon fiber composite material plate with through holes according to the present invention;

Fig. 4 is the axonometric projection view of the lower die structure in the mold used to prepare the carbon fiber composite material plate with through holes according to the present invention;

Fig. 5 is a schematic structural view of the riveting device between the aluminum alloy plate and the carbon fiber composite material plate according to the present invention.

Fig. 6 is a structural schematic diagram of a blind rivet mandrel according to the present invention.

Fig. 7 is a schematic diagram of the structure of the riveting device between the aluminum alloy plate and the carbon fiber composite material plate during the riveting process according to the present invention.

Fig. 8 is a schematic diagram of the finished riveting structure of the riveting device between the aluminum alloy plate and the carbon fiber composite material plate according to the present invention.

Fig. 9 is a schematic diagram of the structure of the aluminum alloy plate and the carbon fiber composite material plate riveted according to the invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

As shown in Figure 1, the carbon fiber composite material molding process includes prepreg cloth mold loading, prepreg cloth gel, mold clamping and pressure, temperature rise and curing, cooling and demoulding, trimming of test pieces and inspection for backup. The preparation mold is composed of an upper punch 110 and a lower die 120. The mold has a simple structure and is convenient for preparing a carbon fiber composite material plate with through holes.

As shown in Figures 2 and 3, the upper punch 110 is a cuboid structure, and a cuboid boss 111 with a relatively small length and width is set at the center with the lower surface of the cuboid as the reference plane, and is set at the center of the boss. There is a combined light hole 112 of a cylinder and a cone, with the bottom surface of the cuboid boss as the reference plane, the light holes close to the reference plane are cylindrical light holes, the light holes far away from the reference plane are cone light holes, and the cylindrical light holes A smooth arc transition is adopted between the cone light hole and the cone tip of the cone light hole.

In another embodiment, the upper punch 110 is made of aluminum alloy, and the base cuboid of the upper punch 110 has a length of 300 mm, a width of 180 mm, and a height of 30 mm. The length of the cuboid boss 111 is 200mm, the width is 80mm, and the height is 25mm. The sides of the cuboid boss are parallel to the sides of the base cuboid respectively, and the distance between each group of parallel planes is 50mm. The combined light hole structure 112 in the upper punch 110 includes a cylindrical light hole and a conical light hole. The diameter of the bottom surface of the cylindrical light hole is 8 mm, and the depth is 10 mm. The diameter of the conical surface of the bottom surface of the cone light hole is 8 mm. The depth of the cone light hole is 10mm, the tip of the cone light hole is a spherical surface with a radius of 1mm, and the connection between the cone light hole and the cylinder light hole adopts an arc surface transition with a radius of 5mm.

As shown in Figures 2 and 4, the lower die 120 is a cuboid structure, and a cuboid groove 121 with relatively small length and width is arranged at the center with the upper surface of the cuboid as the reference plane. There is a combined cylinder and cone light column 122 in the center. The bottom surface of the cuboid boss is used as the reference plane. A smooth arc transition is adopted between them, and a circular arc transition is adopted at the tip of the cone light column. Four semicircular light holes are set at the intersection of the central axis of the cuboid groove in the length and width directions and the side wall of the groove.

In another embodiment, the lower die 120 is made of aluminum alloy, and the base cuboid of the lower die 120 has a length of 300 mm, a width of 180 mm, and a height of 30 mm. The cuboid groove 121 has a length of 200 mm, a width of 80 mm, and a depth of 15 mm. The sides of the cuboid groove are parallel to the sides of the base cuboid respectively, and the distance between each group of parallel planes is 50 mm. The structural geometry and size of the light column 122 in the lower die 2 are consistent with the structure of the light hole in the upper punch 1. The diameter of the bottom surface of the cylindrical light column is 8mm, and the height is 10mm. The diameter of the conical surface of the bottom surface of the cone light column is 8mm. The height of the light column is 10mm, and the tip of the cone light column is a spherical surface with a radius of 1mm. Four semicircular light holes with a radius of 5 mm and a depth of 15 mm are provided at the intersection of the side walls of the groove.

Method used to prepare carbon fiber composite panels with through holes:

On the basis of the designed mold, the preparation of the carbon fiber composite plate is realized, and the designed mold can prepare the carbon fiber composite material plate with through holes.

Fabrication process of carbon fiber composite panels with through holes:

First, after the prepreg process of carbon fiber cloth is completed, the carbon fiber composite material prepreg cloth is cut, and the prepreg cloth is placed into the groove in the lower die 120. During the laying process, the woven carbon fiber composite material prepreg cloth is The weaving pores of the lower die 120 pass through the beam of light, and ensure that the carbon fiber composite material prepreg is completely paved in the groove, and there is no gap between the bottom surface of the groove and the carbon fiber composite material prepreg;

Then, the upper punch 110 and the lower die 120 are assembled together, and the combined mold formed by the upper punch 110 and the lower punch 120 is heated together to carry out the prepreg gel. Taking novolac epoxy vinyl resin as an example, raise the mold clamping temperature to 100°C-110°C to complete the gelation process of the resin;

Then, under the combined state of the upper punch 110 and the lower die 120, a certain pressure is applied to the upper punch 110 and the lower die 120. Taking the novolac epoxy vinyl resin as an example, the combined load is improved while pressurizing. The temperature of the final device reaches 120°C-130°C and is maintained for a period of time to complete the curing of the resin.

Finally, reduce the temperature of the device after the upper punch 110 and the lower die 120 are combined, separate the upper punch 110 and the lower die 120, take out the carbon fiber composite material test piece, and trim the plate to obtain a carbon fiber composite with through holes. The material sheet 150 is spare.

As shown in Figure 5, the riveting riveting device in the riveting method of the aluminum alloy plate and the carbon fiber composite material plate consists of a blind rivet drill 130, a blind rivet mandrel 140, a blind rivet body 150, a die body 180, a pressing The edge circle 190 is formed.

Blind rivet drill bit 130 and blind rivet mandrel 140 are made as a whole. Blind rivet body 150 is composed of nail cap and nail body. Blind rivet drill bit 130, blind rivet mandrel 140 and blind rivet body 150 are composed Special blind rivets. The mandrel 140 is a cylindrical structure, and its diameter is the same as the inner diameter of the riveting body 150 . The drill bit 130 has a conical structure, which transitions with the cylindrical side of the mandrel 140 in a circular arc, and there is another cone at the top of the cone to facilitate drilling of the aluminum alloy plate. Described blank holder 190 is cylindrical structure, and its center is provided with a through hole for positioning drill bit 3, and its diameter is the same as the diameter of the nail cap. During the riveting process, the blind rivet drill 130, the blind rivet mandrel 140, The special blind rivet formed by the blind rivet body 150 moves up and down in the through hole of the blank holder 9.

The die main body 180 is a cylindrical structure, and a through hole is arranged at the center thereof, the diameter of which should be larger than the diameter of the through hole of the blank holder 190 . During the blind riveting process, the through hole of the die main body 180 provides enough space for the special blind rivet to drill through the aluminum alloy plate 160 to form a bush whose length is greater than twice the thickness of the plate. The mandrel 140 moves upward until it breaks, and the bushing opens outwards to form a mechanical interlock with the through hole of the carbon fiber composite material plate 170, and the riveting body 150 can improve the performance of the riveted joint and increase the service life of the structural member.

As shown in Figures 5-6, the carbon fiber composite material plate 170 used in the riveting method of the aluminum alloy plate and the carbon fiber composite material plate has a through hole with a diameter of 6-8mm in the center. Blind rivet drill bit 130, blind rivet mandrel 140, blind rivet riveting body 150 are made of special blind rivet, carbon fiber composite material plate 170, blank holder 190 and die main body 180 are all placed concentrically.

The steps of the riveting method of the aluminum alloy plate and the carbon fiber composite material plate are as follows:

Step 1: As shown in Figure 5, place the carbon fiber composite material plate 170 and the aluminum alloy plate 160 prepared with through holes on the die body 180, the aluminum alloy plate 160 is on top, and the carbon fiber composite material plate 170 is on the bottom , drive the blank holder 190 to press the carbon fiber composite material plate 170 and the aluminum alloy plate 160, and ensure that the special blind rivet and carbon fiber composite material composed of the blind rivet drill bit 130, the blind rivet mandrel 140, and the blind rivet body 150 The coaxiality of the plate 170 and the die body 180.

Step 2. First put the collet into the tool handle correctly, then put the special blind rivet mandrel 140 into the collet and lock it, and then connect the tool handle to the drilling machine. Add a small amount of lubricating oil to the tool, press the handle down, and maintain a regular and uniform feed rate without stopping. Send the special blind rivet into the central positioning through hole of the blank holder 190, the diameter of the cap is 10-12 mm, the outer diameter of the nail is 4-6 mm, and the inner diameter of the nail is 2-4 mm. The diameter of the through hole in the center of the blank holder is the same as the diameter of the nail cap, the diameter of the mandrel 140 is the same as the inner diameter of the nail, the diameter of the bottom of the cone of the drill bit 130 is the same as the outer diameter of the nail, and is slightly smaller than the diameter of the through hole of the carbon fiber composite plate 170 to ensure the formation The thickness of the bushing and the precision of the connection.

As shown in Figure 7, Step 3: During the riveting process of the aluminum alloy plate 160 and the carbon fiber composite material plate 170, the special blind rivet drill bit 130 moves down to contact with the top surface of the aluminum alloy plate 160, and drills the aluminum alloy plate 160 at the same time, the metal flows to form a bush until the special blind rivet drill 130 reaches the bottom dead center, completely drills through the aluminum alloy plate 160 and forms a bush with a certain thickness. The length of the bush is about 2-3 times that of the aluminum alloy plate thick.

As shown in Figure 8-9, Step 4: The tool handle drives the collet, and the collet clamps the mandrel 140 to move upward, generating an upward pulling force, so that the drill bit 130 exerts pressure on the rivet body 5, and the rivet body is compressed and deformed to form the rivet head. The mandrel 140 is pulled out due to the fracture at the constriction, and the riveting is completed to form a riveted joint structure. Referring to FIG. 9 , the preparation process for the next riveting is performed.

Embodiment: Apply the preparation method of the carbon fiber composite material plate with a through hole according to the present invention to prepare a through hole with a diameter of 8mm in the center, and the overall size of the carbon fiber composite material plate is 200mm×80mm×2mm. The base material of the prepared carbon fiber composite board is phenolic epoxy vinyl resin, and the reinforcement material is 3k carbon fiber filaments.

The steps of the riveting method between the aluminum alloy plate and the carbon fiber composite plate comprising the preparation process of the carbon fiber composite material plate with through holes according to the present invention are as follows:

Step 1. Take a piece of aluminum alloy plate 160 to be riveted;

Step 2. Prepare a carbon fiber composite plate 170 with a through hole with a diameter of 8mm. Cut the prepreg cloth into 8 cuboids with a size of 200 mm × 80 mm, and spread the cut carbon fiber prepreg cloth layer by layer to the lower die 120 in the carbon fiber composite material plate device with through holes In the groove of the structure, the pre-impregnated carbon fiber woven cloth passes through the light column in the groove of the lower die 120 through the weaving gap during the laying process. The upper punch 110 and the lower die 120 are combined to apply a pressure of 5 MPa, and the temperature of the clamping mold is raised for 4 hours, and the temperature of the clamping mold is raised to 110° C. for gelation for 15 minutes, and the gelation of the novolak epoxy vinyl resin is completed. After the gel is finished, continue to heat up the mold clamping for 20 minutes to reach 120°C and cure for 2 hours to complete the curing of the novolac epoxy vinyl resin. Reduce the clamping temperature, separate the upper punch 110 and the lower die 120, take out the carbon fiber composite material test piece, trim the plate, and obtain the carbon fiber composite material plate 170 with through holes for riveting between the plates for use.

Step 3. Place the carbon fiber composite material plate 170 and the aluminum alloy plate 160 prepared with through holes on the die body 180 , with the aluminum alloy plate 160 on top and the carbon fiber composite material plate 170 on top. Drive the blank holder 190 to compress the carbon fiber composite material plate 170 and the aluminum alloy plate 160, and ensure that the special blind rivet and carbon fiber composite material plate composed of the blind rivet drill bit 130, the blind rivet mandrel 140, and the blind rivet body 150 170 and the coaxiality of the die main body 180.

Step 4. First put the collet into the tool handle correctly, then put the special blind rivet mandrel into the collet and lock it, and then connect the tool handle to the drilling machine. Add a small amount of lubricating oil to the tool, press the handle down, and maintain a regular and uniform feed rate without stopping. The special blind rivet is sent into the central positioning through hole of the blank holder 190, the diameter of the nail cap is 12mm, the outer diameter of the nail is 6mm, and the inner diameter of the nail is 4mm. The diameter of the through hole in the center of the blank holder is the same as the diameter of the nail cap, the diameter of the mandrel 140 is the same as the inner diameter of the nail, the diameter of the bottom of the cone of the drill bit 130 is the same as the outer diameter of the nail, and is slightly smaller than the diameter of the through hole of the carbon fiber composite plate 170 to ensure the formation The thickness of the bushing and the precision of the connection.

Step 5. The special blind rivet drill bit 130 moves down to contact with the upper surface of the aluminum alloy plate 160. While drilling the aluminum alloy plate 160, the metal flows to form a bushing until the special blind rivet drill bit 130 reaches the bottom dead center and completely drills through the aluminum alloy plate 160. The alloy plate 160 forms a bush with a certain thickness at the same time, and the length of the bush is about 2-3 times the thickness of the aluminum alloy plate;

Step 6. The tool handle drives the collet, and the collet clamps the mandrel 140 to move upward, generating an upward pulling force, so that the drill bit 130 exerts pressure on the rivet body 150, and the rivet body is compressed and deformed to form the rivet head, and at the same time, the mandrel 4 is broken due to the necking It is pulled out, the riveting is completed, and the preparation process for the next riveting is carried out.

In another embodiment, including:

1. Prepare a carbon fiber composite material plate with a through hole with a diameter of 6-8mm before riveting;

2. Put the aluminum alloy plate and the carbon fiber composite material plate to be riveted on the die, the aluminum alloy plate is on top, and the carbon fiber composite material plate is on the bottom, and the blank holder is driven to move down to compress the two plates;

3. First put the collet into the tool handle correctly, then put the special blind rivet mandrel into the collet and lock it, and then connect the tool handle to the drilling machine. Add a small amount of lubricating oil to the tool, press down on the handle to maintain a regular and uniform feed rate without stopping; the formula for calculating the handle's pressing speed v is:

Among them, k is a coefficient, equal to 0.67; l is the diameter of the riveting body; d ₁ is the thickness of the carbon fiber composite material plate; d ₂ is the thickness of the aluminum alloy plate, Γ ₁ is the shear strength of the carbon fiber composite material plate _; Shear strength; A is the cross-sectional area of the through hole of the carbon fiber composite plate; σ _bs is the allowable extrusion stress of the carbon fiber composite plate; σ _as is the allowable extrusion stress of the aluminum alloy plate; D is the thickness of the bushing, about 2 -3 times the thickness of the aluminum alloy plate; t is 2~2.5s.

4. The special blind rivet drill moves down to contact the end surface of the aluminum alloy plate, and the metal flows to form an aluminum alloy bushing while drilling the aluminum alloy plate. Until the special blind rivet drill reaches the bottom dead center, a bush with a certain thickness is formed while completely drilling through the aluminum alloy plate. The length of the bush is about 2-3 times the thickness of the aluminum alloy plate;

5. The tool handle drives the collet, and the collet clamps the mandrel to move upwards, generating an upward pulling force, so that the convex shoulder part of the special blind rivet, that is, the special blind rivet drill bit, exerts pressure on the special blind rivet body, and the riveting body is compressed The deformation forms the rivet head, and at the same time, the mandrel is pulled out due to the fracture at the constriction, and the riveting is completed, and the next riveting is performed.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (4)

1. the staking clinching method between a kind of aluminium alloy plate and carbon fibre composite plate, which is characterized in that including following step Suddenly：

Step 1：One block of carbon fibre composite plate for carrying through-hole is prepared first；

Step 2：Aluminium alloy plate to be riveted and the carbon fibre composite plate with through-hole are placed on cavity plate, the aluminium Alloy sheets are upper, and for the carbon fibre composite plate under, driving blank holder, which is displaced downwardly to, compresses two boards part；

Step 3：Collet is packed into handle of a knife, then self-plugging rivet plug is packed into collet and is locked, handle of a knife is then accessed into drilling machine, Handle is pushed with speed v, the calculation formula that the handle pushes speed v is：

Wherein, k is coefficient, is equal to 0.67；L is rivet body diameter；d₁For carbon fibre composite plate thickness；d₂For aluminium alloy plate thickness Degree, Γ₁For carbon fibre composite plate shearing strength；Γ₂For aluminium alloy plate shearing strength；A is carbon fibre composite plate through-hole Sectional area；σ_bsFor the extrusion stress allowable of carbon fibre composite plate；σ_asFor the extrusion stress allowable of aluminium alloy plate；D is bushing Thickness, about 2-3 times of aluminium alloy plate thickness；T is 2-2.5s；

Step 4：Special self-plugging rivet drill bit is moved down to be contacted with aluminium alloy plate upper surface, metal stream while drilling aluminium alloy plate It is dynamic to form aluminum alloy sleeve, until special self-plugging rivet drill bit reaches lower dead center, tool is formed while drilling through aluminium alloy plate completely There is certain thickness bushing；

Step 5：Collet clamps plug and moves upwards, and generates upward pulling force, and pressure, rivet body are generated to special self-plugging rivet rivet body Compressive deformation forms manufactured head, while plug is drawn out since bottleneck is broken, and riveting is completed, and is riveted next time.

2. the staking clinching method between aluminium alloy plate according to claim 1 and carbon fibre composite plate, feature It is, the carbon fibre composite plate with through-hole is prepared using following device, including：

Upper male mould is cuboid, and the upper male mould lower surface is provided centrally with cuboid boss, and the boss is provided centrally with Combination bore；

Lower punch is cuboid, and the lower punch upper surface is provided centrally with cuboid groove, and the groove center has group Zygostyle, the coupled column can the deep enough combination bores.

3. the staking clinching method between aluminium alloy plate according to claim 2 and carbon fibre composite plate, feature It is, the combination bore, including：

Tapered portion is round taper hole, close to the upper male mould upper surface at the top of the conical bore；

Cylindrical portion is cylindrical hole close to the upper male mould lower surface, and the tapered portion uses arc transition with the cylindrical portion；

The coupled column, including：

Tapered pole is batter post, close to the lower punch upper surface at the top of the conical bore；

Cylinder, for cylinder, close to the lower punch lower surface, the tapered pole uses arc transition with the cylinder.

4. the staking riveting side between aluminium alloy plate according to any one of claim 1-3 and carbon fibre composite plate Method, which is characterized in that the carbon fibre composite plate preparation method with through-hole, including：

First, it completes carbon cloth and presoaks process, and carbon fibre composite prepreg cloth is cut out, tiling is put into lower cavity die Groove, so that the braiding hole of the composite material presoaked cloth of weaving carbon fiber is passed through the coupled column in lower cavity die, And ensure that carbon fibre composite prepreg cloth is all paved in groove, bottom surface and the carbon fibre composite prepreg cloth of groove Between there is no gap；

Then, upper male mould is attached together with lower cavity die make together upper male mould and lower cavity die at molding jointly heating presoaked Cloth gel；

Then, certain pressure is applied to upper male mould and lower cavity die in the case where upper male mould and lower cavity die attach together state, in pressurization It improves simultaneously and attaches together the temperature of rear device and kept for a period of time, complete the solidification of resin；

Finally, it reduces upper male mould and attaches together rear unit temp with lower cavity die, detach upper male mould and lower cavity die, take out carbon fiber composite Expect test specimen, plate is trimmed, obtains the carbon fibre composite plate with through-hole.