A friction stir welding and riveting composite connecting device and method integrating drilling, welding, riveting and pulling

Abstract

The application provides a friction stir welding and riveting composite connecting device and method, which integrates drilling, welding, riveting and pulling. The device comprises a shell, a riveting drill head assembly, a gear fastening assembly, a riveting transmission rod, a main shaft transmission assembly, a main shaft driving assembly, a controller and a riveting nut. The riveting drill head assembly is used for drilling. The gear fastening assembly is arranged along the circumference of the riveting drill head assembly and is used for clamping and positioning the riveting drill head assembly. The riveting nut is located behind the riveting drill head assembly. The riveting transmission rod is arranged behind the riveting drill head assembly. The riveting transmission rod can move forward and backward and rotate circumferentially, and drives the riveting nut and the riveting drill head assembly to rotate and advance. The main shaft transmission assembly is used for driving the riveting transmission rod to rotate circumferentially. The main shaft driving assembly is used for driving the riveting transmission rod to move forward and backward. The controller is used for controlling the main shaft transmission assembly and the main shaft driving assembly to work. The application has high integration degree, light structure, low cost and simple operation, and does not have potential material damage.

Description

Technical Field

[0001] This invention relates to the field of plate joining technology, and in particular to a combined friction stir welding and riveting joint device and method integrating drilling, welding, riveting and pulling. Background Technology

[0002] "High-performance precision forming manufacturing science" is an important direction for the development of mechanical engineering. Lightweight technology, aimed at energy conservation and emission reduction, is considered one of the key technologies in high-performance forming manufacturing. Replacing or partially replacing traditional steel materials with lightweight alloy materials will become a concrete implementation method for lightweight technologies in the future aerospace, automotive, and aircraft transportation industries. Welding and riveting are two main methods for joining lightweight alloy materials and are widely used in the transportation industry.

[0003] However, traditional welding processes (such as MIG welding and TIG welding) easily generate toxic and harmful gases, polluting the environment and posing certain health risks. Ordinary riveting requires pre-drilling, resulting in longer processing times and greater complexity. Friction stir riveting does not require pre-drilling, but it requires the rivet to rotate at high speed and vertically pierce the surface of the materials to be joined, leading to metal accumulation between the plates. There is also the possibility of insufficient root cut due to excessive material softening. The heat generated by friction is sufficient for the rivet to penetrate the upper plate, but insufficient for it to penetrate the lower plate, resulting in insufficient rivet depth. Furthermore, insufficient heat generation from friction stir may lead to inadequate softening of the upper plate, causing the rivet to break due to excessive stress. All of these factors limit its application under certain requirements. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the above-mentioned background technology by providing an integrated friction stir welding and riveting composite connection solution that combines drilling, welding, riveting, and pulling, so as to achieve the following: no harmful gases are generated during the plate connection process, no damage to the plate is caused, and the connection is fast and efficient.

[0005] To achieve the above objectives, the present invention provides an integrated friction stir welding and riveting composite connection device, comprising a housing, a riveting drill bit assembly, a gear fastening assembly, a riveting transmission rod, a spindle transmission assembly, a spindle drive assembly, a controller, and a riveting nut;

[0006] The rivet drill bit assembly and the gear fastening assembly are located at the front end of the housing. The rivet drill bit assembly is used for drilling holes. The gear fastening assembly is arranged circumferentially along the rivet drill bit assembly and is used to clamp and position the rivet drill bit assembly. The rivet nut is located behind the rivet drill bit assembly. The rivet drive rod is located behind the rivet drill bit assembly. The rivet drive rod can move back and forth and rotate circumferentially, driving the rivet nut and the rivet drill bit assembly to rotate and advance. The spindle drive assembly is used to drive the rivet drive rod to rotate circumferentially. The spindle drive assembly is used to drive the rivet drive rod to move back and forth. The controller is used to control the operation of the spindle drive assembly and the spindle drive assembly.

[0007] Furthermore, it also includes a rivet clamp containing a plurality of the rivet nuts, the rivet clamp being used to sequentially transport the rivet nuts to the rear of the rivet drill bit assembly.

[0008] Furthermore, the riveting drill bit assembly includes a drill bit mounting body and a drill bit. The front end of the drill bit mounting body is provided with a drill bit sliding groove, and the drill bit is disposed in the drill bit sliding groove. The drill bit sliding groove has a T-shaped channel, and the rear part of the drill bit is provided with a T-shaped connecting part. The T-shaped channel matches the T-shaped connecting part, and the contact surface of the T-shaped channel and the T-shaped connecting part is an inclined surface. The drill bit and the drill bit sliding groove are elastically connected.

[0009] Furthermore, the rear end of the drill bit mounting body is provided with a transmission internal thread hole, which is used to connect with the riveting transmission rod.

[0010] Furthermore, the gear fastening assembly includes a pair of fastening clamps, a sliding bar, and a transmission guide rod arranged opposite to each other. The fastening clamps are provided with sliding blocks, and the outer shell is provided with a sliding channel corresponding to the sliding blocks. The sliding blocks are slidably disposed in the sliding channels and are elastically connected to the sliding channels. The sliding blocks are provided with locking holes, which correspond to the sliding bars. The transmission guide rod is hinged to the fastening clamps. The transmission guide rod drives the sliding bars to move during the forward movement of the riveting transmission rod, and the sliding bars are slidably connected to the outer shell.

[0011] Furthermore, the front part of the rivet drive rod is provided with a small-diameter external thread and a large-diameter external thread in sequence, and the rear part of the rivet drive rod is provided with a rear external thread, a first keyway, and a second keyway. The small-diameter external thread is used to connect with the transmission internal thread hole, the large-diameter external thread is used to connect with the rivet nut, the rear external thread is located behind the first keyway, the first keyway is used to connect with the spindle drive assembly, and the second keyway is used to connect with the spindle drive assembly.

[0012] Furthermore, the main shaft transmission assembly includes a helical gear, a limiting nut, a flat key, and an active power output unit. The flat key is disposed in the first keyway and is used to connect the helical gear and the riveting transmission rod. The limiting nut is connected to the rear external thread and is used to restrict the rearward axial movement of the helical gear. The active power output unit is used to drive the helical gear to rotate circumferentially.

[0013] Furthermore, the active power output unit includes a first motor, a coupling, and a gear shaft. The helical gear meshes with the gear shaft, and the end of the gear shaft is supported by a support ball bearing. The first motor is connected to the gear shaft via the coupling.

[0014] Furthermore, the spindle drive assembly includes a drive rack, a spur gear, a threaded cover, and a second motor. The drive rack is movably configured, the spur gear meshes with the drive rack, the second motor is drivenly connected to the spur gear, the threaded cover is disposed in the second keyway, the front part of the drive rack passes through the bearing of the threaded cover and is inserted into the second keyway, and is connected with a snap-fit ​​nut. The size of the snap-fit ​​nut is larger than the bore size of the bearing.

[0015] Furthermore, the outer surface of the rivet nut is provided with an integrally conical stirring texture, and the front part of the rivet nut is provided with a pushing slope.

[0016] This invention also provides a method for integrated drilling, welding, riveting, and pulling friction stir welding and riveting composite connection, specifically including the following steps:

[0017] S1, stack and fix the two metal plates to be connected in a certain suspended position, then vertically align the drill bit with the connection point of the plates, hold the device and press the forward button of the controller.

[0018] S2, the first and second motors rotate, driving the riveting transmission rod to move axially and circumferentially. During the advancement of the riveting transmission rod, the riveting transmission rod is screwed into the riveting nut, and then into the riveting drill bit assembly. During the continued advancement, the riveting nut touches the transmission guide rod through the advancement slope, allowing the fastening clamp to be in a relaxed state. During the continued advancement, the drill bit begins to drill a hole at the plate joint point until it penetrates the plate. Then, the riveting nut reaches the hole during the synchronous advancement. Through the stirring texture on the riveting nut, it continues to rotate at high speed at the plate joint point. The heat generated by the friction with the plate causes the material to be locally plasticized. When the riveting nut with stirring texture moves forward along the plate interface, the plasticized material flows from the front to the rear of the riveting nut under the action of the rotational friction of the riveting nut, and forms a dense solid phase weld under the extrusion of the riveting nut.

[0019] S3, after completing the friction stir welding, press the back button on the controller. The riveting drive rod and the riveting drill bit assembly reverse and retract. The riveting nut will be tightened before it exits the hole, forming an interlock at the plate connection point. Continuing to retract the riveting drill bit assembly will allow it to slide through the slide base, causing the drill bit to unscrew the riveting nut. When the riveting drive rod exits the fastening clamp, the fastening clamp clamps the riveting drill bit assembly, and the sliding bar also resets to lock the fastening clamp. During the continuous retraction process, the riveting drive rod smoothly exits the riveting drill bit assembly and returns to the initial position, completing the entire drilling, welding, riveting process of the plate.

[0020] The above-described solution of the present invention has the following beneficial effects:

[0021] The invention provides an integrated drilling, welding, riveting, and friction stir welding composite connection device and method. Through the cooperation of the riveting drill bit assembly, gear fastening assembly, riveting transmission rod, main shaft transmission assembly, and main shaft drive assembly, as well as the special design of the riveting nut, it achieves a process that eliminates the need for pre-drilling, ensuring that it does not affect the subsequent riveting process. Furthermore, it can automatically and orderly clamp and release the riveting drill bit assembly during operation. The post-installed rivet method significantly reduces the time and physical effort required during operation. Combining the characteristics of the riveting nut and friction stir welding significantly enhances the final connection strength of the sheet metal, eliminates the emission of toxic and harmful gases, is more energy-efficient and emission-reducing, and poses no safety risk to operators. The entire device is highly integrated, lightweight, low-cost, simple to operate, and eliminates any potential material damage.

[0022] Other beneficial effects of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the riveting drill bit assembly structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the drill bit structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the slide base structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the fastening clamp structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the mounting structure of the sliding bar and transmission guide rod of the present invention;

[0029] Figure 7 This is a schematic diagram of the riveting transmission rod structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the spindle transmission assembly and spindle drive assembly of the present invention;

[0031] Figure 9 This is a schematic diagram of the gear shaft structure of the present invention;

[0032] Figure 10 This is a schematic diagram of the threaded cover structure of the present invention;

[0033] Figure 11 This is a schematic diagram of the mounting clip structure of the present invention;

[0034] Figure 12 This is a schematic diagram of the rivet nut structure of the present invention;

[0035] Figure 13 This is a flowchart illustrating the operation of this invention.

[0036] [Explanation of Labels in the Attached Image]

[0037] 100-Outer shell; 101-First cavity; 102-Second cavity; 103-Third cavity; 104-Fourth cavity; 105-Fifth cavity; 200-Riveting drill bit assembly; 201-Drill bit mounting body; 202-Drill bit; 203-Drill bit sliding groove; 204-Drill bit internal threaded hole; 205-Sliding groove base; 206-T-shaped connection; 207-T-shaped channel; 208-Transmission internal threaded hole; 300-Gear fastening assembly; 301-Fasting clamp; 302-Sliding bar; 303-Transmission guide rod; 304-Sliding channel; 305-Sliding block; 306-Locking hole; 307- Limiting block; 400-Riveting clamp; 500-Riveting drive rod; 501-Small diameter external thread; 502-Large diameter external thread; 503-Rear external thread; 504-First keyway; 505-Second keyway; 600-Main shaft drive assembly; 601-Helical gear; 602-Limiting nut; 603-First motor; 604-Coupling; 605-Gear shaft; 700-Main shaft drive assembly; 701-Drive rack; 702-Spur gear; 703-Threaded cover; 800-Controller; 900-Riveting nut; 901-Stirring texture; 902-Propeller slope; 903-Intermetallic compound. Detailed Implementation

[0038] To make the technical problems, solutions, and advantages of this invention clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] like Figure 1As shown, an embodiment of the present invention provides an integrated friction stir welding and riveting composite connection device, comprising a housing 100, a riveting drill bit assembly 200, a gear fastening assembly 300, a rivet clamp 400, a riveting transmission rod 500, a spindle transmission assembly 600, a spindle drive assembly 700, a controller 800, and a riveting nut 900. The housing 100 contains a first cavity 101, a second cavity 102, a third cavity 103, a fourth cavity 104, and a fifth cavity 105. The first cavity 101, second cavity 102, and third cavity 103 are connected sequentially from front to back. The fourth cavity 104 is located below and behind the third cavity 103, and the fifth cavity 105 is located behind the third cavity 103, all of which are connected to the third cavity 103. The riveting drill bit assembly 200 is disposed within the first cavity 101, located at the front end of the housing 100. A gear fastening assembly 300 is also disposed within the first cavity 101 and arranged circumferentially along the riveting drill bit assembly 200, used for clamping and positioning the riveting drill bit assembly 200. The rivet nut 900 to be installed is placed within the second cavity 102. A mounting clip 400 communicates with the second cavity 102 and stores multiple rivet nuts 900, used to sequentially transport the rivet nuts 900 to the second cavity 102 for subsequent installation. A riveting drive rod 500 is movably disposed within the third cavity 103, its front end extending into the second cavity 102 and the first cavity 101 to drive the rivet nut 900 and the riveting drill bit assembly 200 to rotate and advance. A spindle drive assembly 600 is disposed within the fourth cavity 104 to drive the riveting drive rod 500 to rotate circumferentially, and a spindle drive assembly 700 is disposed within the fifth cavity 105 to drive the riveting drive rod 500 to achieve reciprocating motion. The controller 800 is electrically connected to both the spindle drive assembly 600 and the spindle drive assembly 700, and is used to control the operation of the motors of the spindle drive assembly 600 and the spindle drive assembly 700.

[0042] When in use, hold the handle of the housing 100 and press the control button on the controller 800 to control the motor, apply driving force to the spindle transmission assembly 600 and the spindle drive assembly 700, so that the riveting transmission rod 500 obtains circumferential rotation and axial forward movement. The riveting transmission rod 500 is screwed into the riveting nut 900 in the second cavity 102. The riveting transmission rod 500 continues to advance and is screwed into the riveting drill bit assembly 200, which is positioned by the gear fastening assembly 300. The continuous advancement makes the riveting drill bit assembly 200 and the riveting nut 900 drill into the plate to complete the installation. After installation, the motor is switched to reverse rotation by pressing the button to complete the riveting process and smoothly retract the tool.

[0043] At the same time, such as Figures 2-4As shown, in this embodiment, the riveting drill bit assembly 200 includes a drill bit mounting body 201 and a flat drill bit 202. The front end of the drill bit mounting body 201 has a drill bit sliding groove 203, and the bottom of the groove 203 has a drill bit internal thread hole 204. A sliding base 205 with external threads at the rear is mounted through the drill bit internal thread hole 204. The front of the drill bit 202 adopts an asymmetrical design, and the rear of the drill bit 202 has a T-shaped connecting part 206. The front of the sliding base 205 has a T-shaped channel 207 that matches the T-shaped connecting part 206. The drill bit 202 is connected to the sliding base 205 through the cooperation of the T-shaped channel 207 and the T-shaped connecting part 206. Furthermore, the rear end of the drill bit mounting body 201 has a transmission internal thread hole 208, which connects to the riveting transmission rod 500 for synchronous forward and backward movement and torque transmission.

[0044] Both the T-shaped connecting part 206 and the T-shaped channel 207 are inclined surfaces. A return spring is also installed within the drill bit sliding groove 203, connected to the drill bit 202. During drilling, the drill bit 202 is in the forward advancing state, and is at its rearmost limit position relative to the drill bit sliding groove 203. Therefore, the drill bit 202 will not displace along the inclined surface relative to the drill bit sliding groove 203. After the rivet nut 900 is installed, the rivet drill bit assembly 200 needs to remove the rivet nut 900. With the inclined surfaces of the T-shaped connecting part 206 and the T-shaped channel 207, the drill bit 202 will typically slide along the T-shaped channel 207, eventually exiting the rivet nut 900 at a suitable position. This ensures the smooth exit of the rivet drill bit assembly 200 after the rivet nut 900 is installed, preventing the drill bit 202 from being obstructed by the inner hole of the rivet nut 900.

[0045] The return spring ensures that the drill bit 202 slides along the T-slot 207 to return to its original position after successful retraction, so as to facilitate the subsequent installation of the rivet nut 900.

[0046] It should be noted that in this embodiment, the front of the drill bit 202 is also provided with multiple bevels to facilitate its exit from the inner hole of the rivet nut 900, and the resistance encountered during operation will be less.

[0047] At the same time, such as Figure 5 , Figure 6As shown, in this embodiment, the gear fastening assembly 300 includes a pair of fastening clamps 301, a sliding bar 302, and a transmission guide rod 303 arranged opposite to each other. The pair of fastening clamps 301 are cylindrical and used to clamp the drill bit mounting body 201. The sliding bar 302 is slidably connected to the first cavity 101 via a groove. When the rivet nut 900 advances, the transmission guide rod 303 can apply a horizontal transmission force to the sliding bar 302 to drive its displacement. A thrust spring is provided at the tail end of the sliding bar 302 to ensure that it can lock into the locking hole 306 during retraction. The first cavity 101 is also provided with a sliding channel 304. The fastening clamp 301 is provided with a sliding block 305 corresponding to the sliding channel 304. The sliding block 305 is provided with a locking hole 306. The locking hole 306 cooperates with the sliding strip 302 to fix the position of the fastening clamp 301. The sliding channel 304 is also provided with a compression spring. The compression spring is connected to the sliding block 305. In addition, the sliding block 305 is also provided with a limiting block 307. The limiting block 307 cooperates with the housing groove to maintain the position of the fixing frame 301.

[0048] The transmission guide rod 303 is hinged to the rear of the fastening clamp 301 by a fixing pin. During the advancement of the riveting transmission rod 500, it can drive the fixing pin and the transmission guide rod 303 to rotate, so that the transmission guide rod 303 contacts the sliding bar 302 and drives the sliding bar 302 to move backward. At this time, the sliding bar 302 exits the locking hole 306, and the fastening clamp 301 is in an elastic motion state under the action of the compression spring. Subsequently, the riveting nut 900 and the riveting transmission rod 500 can pass through the fastening clamp 301. During the retraction of the riveting drive rod 500, when the large-diameter external thread 502 of the riveting drive rod 500 leaves the fixing pin, the limiting block 307 is in the extreme position under the action of the compression spring. At the same time, the sliding bar 302 is no longer in force with the drive guide rod 303. The sliding bar 302 is reset under the action of the thrust spring and re-engages in the locking hole 306, locking the fastening clamp 301. At this time, the fastening clamp 301 is in the position of clamping the drill bit mounting body 201 under the action of the compression spring, and the locking hole 306 is aligned with the sliding bar 302.

[0049] At the same time, such as Figure 7As shown, in this embodiment, the front of the rivet drive rod 500 is sequentially provided with a small-diameter external thread 501 and a large-diameter external thread 502, and the rear of the rivet drive rod 500 is provided with a rear external thread 503, a first keyway 504, and a second keyway 505. The small-diameter external thread 501 engages with the internal threaded hole 208 of the drill bit mounting body 201 via a threaded connection to transmit torque. The large-diameter external thread 502 engages with the inner hole of the rivet nut 900 via a threaded connection. The rear external thread 503 is located behind the first keyway 504, which is connected to the spindle drive assembly 600 via a key connection to transmit torque. The second keyway 505 is used to connect to the spindle drive assembly 700 for forward and backward displacement.

[0050] At the same time, such as Figure 8 As shown, in this embodiment, the spindle drive assembly 600 includes a helical gear 601, a limiting nut 602, a flat key, and a power output unit. The flat key is disposed in the first keyway 504 of the riveting drive rod 500, connecting the helical gear 601 and the riveting drive rod 500. The limiting nut 602 is sleeved on the rear external thread 503 of the riveting drive rod 500, restricting the rearward axial movement of the helical gear 601. The forward axial movement of the helical gear 601 is restricted by a shoulder. The power output unit, in cooperation with the helical gear 601, drives the riveting drive rod 500 to rotate circumferentially.

[0051] At the same time, such as Figure 9 As shown, since the riveting transmission rod 500 needs to move back and forth, while the active power output unit only performs rotational drive, in order to ensure that the riveting transmission rod 500 can still transmit torque during its movement, this embodiment adopts a helical gear 601 scheme. The active power output unit includes a first motor 603, a coupling 604, and a gear shaft 605. The helical gear 601 meshes with the gear shaft 605, and the end of the gear shaft 605 is supported by a support ball bearing. The first motor 603 transmits power to the gear shaft 605 through the coupling 604, driving the helical gear 601 and the riveting transmission rod 500 to rotate circumferentially, thus achieving the above-mentioned effect.

[0052] Please refer to it again. Figure 8In this embodiment, the spindle drive assembly 700 includes a drive rack 701, a spur gear 702, a rack locking part, and a second motor. The drive rack 701 is slidably disposed in the fifth cavity 105. During its sliding motion, the drive rack 701 drives the riveting transmission rod 500 to reciprocate. The spur gear 702 meshes with the drive rack 701. The second motor is connected to the spur gear 702 to provide driving force in both forward and reverse rotation directions. The rack locking part is disposed in the second keyway 505 at the rear of the riveting transmission rod 500. The rack locking part prevents the drive rack 701 from rotating circumferentially with the riveting transmission rod 500 while ensuring that the drive rack 701 does not separate from the riveting transmission rod 500.

[0053] At the same time, such as Figure 10 As shown, the rack locking part includes a threaded cover 703 with a bearing embedded in it. The threaded cover 703 is installed in the second keyway 505 by a threaded connection. The front part of the drive rack 701 passes through the bearing and is inserted into the second keyway 505. A snap-fit ​​nut is provided. The size of the snap-fit ​​nut is larger than the diameter of the bearing hole. Therefore, while keeping the drive rack 701 and the riveting transmission rod 500 fixed front and back, the rotational movement of the riveting transmission rod 500 relative to the drive rack 701 is ensured.

[0054] In this embodiment, the rivet nut 900 to be installed is located in the second cavity 102, and the remaining rivet nuts 900 are placed in the mounting clip 400, such as... Figure 11 As shown. At the same time, as Figure 12 As shown, compared to existing technologies, the rivet nut 900 features an additional conical stirring texture 901 on its outer surface. This texture, under high-speed rotation, stirs the holes on the sheet metal smaller than the minimum outer diameter of the rivet nut 900, ultimately forming an intermetallic compound 903 to enhance the strength of the rivet connection joint. Simultaneously, a ramp 902 is formed at the front of the rivet nut 900, allowing it to slide more smoothly into the elastically moving fastening clamp 301.

[0055] Based on the same inventive concept, this embodiment also provides a method for integrated drilling, welding, riveting, and pulling friction stir welding and riveting composite connection. Please refer to the following references as well. Figure 13 Specifically, it includes the following steps:

[0056] S1, stack and fix the two metal plates to be connected at a certain suspended position, then vertically align the drill bit 202 of the device with the connection point of the plates, hold the device and press the forward button of the controller 800.

[0057] S2, the first motor 603 and the second motor rotate, driving the riveting transmission rod 500 to move axially and circumferentially. During the advancement of the riveting transmission rod 500, it screws into the riveting nut 900, and subsequently into the riveting drill bit assembly 200. As it continues to advance, the rivet nut 900 touches the transmission guide rod 303 through the advancement slope 902, thereby releasing the fastening clamp 301. During the continued advancement, the drill bit 202 begins to drill a hole at the joint point of the plates until it penetrates the plate. The material is then pushed forward, and the rivet nut 900 reaches the hole during synchronous advancement. Through the stirring texture 901 on the rivet nut 900, it continues to rotate at high speed at the joint of the plates. The heat generated by friction with the plates causes the material to be locally plasticized. When the rivet nut 900 with stirring texture 901 moves forward along the plate interface, the plasticized material flows from the front to the rear of the rivet nut 900 under the action of the rotational friction force of the rivet nut 900, and forms a dense solid phase weld under the extrusion of the rivet nut 900.

[0058] S3, after the rivet nut 900 completes friction stir welding, press the back button on the controller 800. The rivet drive rod 500 reverses and retracts. Before the rivet nut 900 exits the hole, it will be tightened to form an interlock at the plate connection point. Continuing to exit the rivet drill bit assembly 200, it will slide through the slide base 205, allowing the asymmetric drill bit 202 to unscrew the rivet nut 900. After the rivet drive rod 500 exits the fastening clamp 301, the fastening clamp 301 clamps the rivet drill bit assembly 200, and the sliding bar 302 also resets to lock the fastening clamp 301. During the continuous retraction process, the rivet drive rod 500 also successfully exits the rivet drill bit assembly 200 and returns to the initial position. At this point, the entire drilling, welding, riveting process of the plate is completed.

[0059] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A friction stir welding and riveting composite connection device for drilling, welding, riveting and pulling, characterized by, The pull-rivet drilling head assembly, the gear fastening assembly are arranged at the front end of the shell, the pull-rivet drilling head assembly is used for drilling, the gear fastening assembly is arranged along the circumference of the pull-rivet drilling head assembly and is used for clamping and positioning the pull-rivet drilling head assembly, the pull-rivet nut is located behind the pull-rivet drilling head assembly, the pull-rivet driving rod is arranged behind the pull-rivet drilling head assembly, the pull-rivet driving rod can move forward and backward and rotate circumferentially, drives the pull-rivet nut and the pull-rivet drilling head assembly to rotate and advance, the main shaft driving assembly is used for driving the pull-rivet driving rod to rotate circumferentially, the main shaft driving assembly is used for driving the pull-rivet driving rod to move forward and backward, and the controller is used for controlling the main shaft driving assembly and the main shaft driving assembly to work. The pull-rivet drilling head assembly comprises a drill head mounting body and a drill head, the front end of the drill head mounting body is provided with a drill head sliding groove, the drill head is arranged in the drill head sliding groove, the drill head sliding groove has a T-shaped channel, the rear part of the drill head is provided with a T-shaped connecting part, the T-shaped channel is matched with the T-shaped connecting part, the contact surfaces of the T-shaped channel and the T-shaped connecting part are inclined surfaces, and the drill head is elastically connected with the drill head sliding groove. The gear fastening assembly comprises a pair of fastening clamps, a sliding bar and a transmission guide rod which are arranged oppositely, the fastening clamp is provided with a sliding block, the shell is provided with a sliding channel corresponding to the sliding block, the sliding block is slidably arranged in the sliding channel, the sliding block is elastically connected with the sliding channel, the sliding block is provided with a locking hole corresponding to the sliding bar, the transmission guide rod is hingedly connected with the fastening clamp, and the transmission guide rod drives the sliding bar to displace in the advancing process of the pull-rivet driving rod. The pull-rivet drilling head assembly, the gear fastening assembly are arranged at the front end of the shell, the pull-rivet drilling head assembly is used for drilling, the gear fastening assembly is arranged along the circumference of the pull-rivet drilling head assembly and is used for clamping and positioning the pull-rivet drilling head assembly, the pull-rivet nut is located behind the pull-rivet drilling head assembly, the pull-rivet driving rod is arranged behind the pull-rivet drilling head assembly, the pull-rivet driving rod can move forward and backward and rotate circumferentially, drives the pull-rivet nut and the pull-rivet drilling head assembly to rotate and advance, the main shaft driving assembly is used for driving the pull-rivet driving rod to rotate circumferentially, the main shaft driving assembly is used for driving the pull-rivet driving rod to move forward and backward, and the controller is used for controlling the main shaft driving assembly and the main shaft driving assembly to work.

2. The friction stir rivet-composite joint of claim 1, wherein, The rear end of the drill head mounting body is provided with a transmission inner threaded hole, and the transmission inner threaded hole is used for being connected with the pull-rivet driving rod.

3. The friction stir rivet-composite joint of claim 1, wherein, The front part of the pull-rivet driving rod is sequentially provided with a small-diameter external thread and a large-diameter external thread, the rear part of the pull-rivet driving rod is provided with a rear external thread, a first key groove and a second key groove, the small-diameter external thread is used for being connected with the transmission inner threaded hole, the large-diameter external thread is used for being connected with the pull-rivet nut, the rear external thread is located behind the first key groove, the first key groove is used for being connected with the main shaft driving assembly, and the second key groove is used for being connected with the main shaft driving assembly.

4. The friction stir welding and riveting hybrid connection device of claim 3, wherein The main shaft driving assembly comprises a helical gear, a limiting nut, a flat key and a main driving power output part, the flat key is arranged in the first key groove and is used for connecting the helical gear with the pull-rivet driving rod, the limiting nut is connected with the rear external thread and is used for limiting the axial movement of the helical gear in the rear direction, and the main driving power output part is used for driving the helical gear to rotate circumferentially.

5. The friction stir rivet-composite joint of claim 4, wherein, ​ The main drive output part comprises a first motor, a shaft coupling and a gear shaft, the helical gear is engaged with the gear shaft, the end of the gear shaft is supported by a support ball bearing, and the first motor is in transmission connection with the gear shaft through the shaft coupling.

6. The friction stir rivet-composite joint of claim 4, wherein, The main shaft drive assembly comprises a driving rack, a spur gear, a threaded cover, and a second motor, the driving rack is movably arranged, the spur gear is engaged with the driving rack, the second motor is in transmission connection with the spur gear, the threaded cover is arranged in the second key groove, the front part of the driving rack is inserted into the second key groove through the bearing of the threaded cover, and a clamping nut is connected, the size of the clamping nut is larger than the hole diameter size of the bearing.

7. The friction stir rivet-composite joint of claim 1, wherein, The outer surface of the pull-rivet nut is provided with a whole taper stirring texture, and the front part of the pull-rivet nut is provided with a propelling slope.

8. A method for drilling, welding, riveting and pulling integrated friction stir rivet hybrid connection, using the drilling, welding, riveting and pulling integrated friction stir rivet hybrid connection device according to any one of claims 1-7, characterized in that, The method comprises the following steps: S1, two metal plates to be connected are fixed in a suspended position, then a drill bit is vertically aligned with the plate connection point, the device is held, and the forward button of the controller is pressed; S2, the first motor and the second motor rotate to drive the pull-rivet drive rod to move axially and circumferentially, in the process of the forward movement of the pull-rivet drive rod, the pull-rivet drive rod is screwed into the pull-rivet nut, and then the pull-rivet drill bit assembly is screwed in, in the process of continuous forward movement, the propelling slope of the pull-rivet nut touches the drive guide rod, so that the fastening clamp is in a relaxed state, in the process of continuous forward movement, the drill bit starts to drill at the plate connection point until penetrating the plate, then the pull-rivet nut reaches the hole in the process of synchronous forward movement, the stirring texture on the pull-rivet nut continues to rotate at high speed at the plate connection point, heat generated by friction between the pull-rivet nut and the plate makes the material locally plasticized, when the pull-rivet nut with the stirring texture moves forward along the plate interface, the plasticized material flows from the front part to the rear part of the pull-rivet nut under the action of the rotating friction of the pull-rivet nut, and forms a dense solid-phase weld under the extrusion of the pull-rivet nut; S3, after the friction stir welding is completed, the retreat button of the controller is pressed, the pull-rivet drive rod and the pull-rivet drill bit assembly are reversed and retreated, the pull-rivet nut is tightened to form interlocking of the plate connection point before the pull-rivet nut is withdrawn from the hole, continuous withdrawal of the pull-rivet drill bit assembly is achieved by sliding of the sliding groove base to make the drill bit rotate out of the pull-rivet nut, when the pull-rivet drive rod is withdrawn from the fastening clamp, the fastening clamp clamps the pull-rivet drill bit assembly, the sliding strip is also reset to lock the fastening clamp, in the process of continuous retreat, the pull-rivet drive rod is smoothly withdrawn from the pull-rivet drill bit assembly and returns to the initial position, and the whole plate drilling, welding and riveting process is completed.

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