A feed-stir friction-increased riveting metallurgical and mechanical connecting device and method

Abstract

The application relates to the field of material connection, and discloses a feeding stirring friction riveting metallurgical and mechanical connection device and method, which comprises a powder feeder, a wire, a wire feeder, an electric spindle shell, a cutting bed compression ring, a sleeve connecting shaft, a cutting sleeve, a stirring needle connecting shaft, a stirring needle, a top plate and a bottom plate. The device fixes the cutting bed compression ring and the powder feeder through the electric spindle shell, the cutting sleeve and the stirring needle are coaxially matched with a gap, the cutting and feeding of the wire are realized through the variable thread of the cutting sleeve, and the metallurgical and mechanical composite connection of the powder and the wire is completed through the stirring needle. The method is divided into two riveting types of ring rivets and center rivets, and through steps such as preheating, downward piercing, feeding, back pulling and forming, efficient connection and in-situ defect repair of various metals and polymer materials are realized. The application improves the connection strength and process flexibility, is suitable for various materials and application scenes, and has the advantages of high welding efficiency, stable quality, low equipment maintenance cost and the like.

Description

Technical Field

[0001] This invention relates to the field of material joining technology, specifically to a metallurgical and mechanical joining device and method using feeding, stirring, friction riveting. Background Technology

[0002] In modern manufacturing, material joining technology is crucial, especially in aerospace, automotive, and machining industries, where the quality of joining technology directly impacts product performance and lifespan. Traditional joining methods, such as welding and riveting, while widely used, often have limitations when dealing with diverse materials, complex structures, and high-strength requirements. Particularly when joining lightweight or dissimilar materials, traditional techniques are prone to insufficient joint strength and weak interface bonding. Furthermore, traditional welding and riveting processes are typically complex, requiring multiple preparation and processing steps, leading to low production efficiency. Simultaneously, these methods can generate large heat-affected zones during processing, causing material performance degradation and even welding defects such as cracks and voids, severely impacting the final join quality.

[0003] Furthermore, with the increasing demands for lightweight and high-performance materials, traditional processes exhibit significant limitations in joining polymer and metal materials, failing to achieve uniform and robust connections. Existing riveting techniques still have considerable room for improvement in terms of material adaptability, process stability, and connection strength, especially when in-situ defect repair is required, where traditional methods often fail to provide sufficient repair results. Therefore, developing a metallurgical-mechanical composite joining technology that can effectively improve connection strength, adapt to various materials, and simplify the process flow has become a key requirement for solving the aforementioned problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a metallurgical and mechanical connection device and method for feeding, stirring, and friction riveting, which solves the problems of insufficient material connection strength, complex processes, and limited applicable material range in existing technologies.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a metallurgical and mechanical connection device for feeding, stirring, friction, and riveting, comprising:

[0006] The housing of the electric spindle is used to fix and support the various components of the device;

[0007] The guillotine clamping ring is fixed to the bottom of the electric spindle housing. The inner wall is provided with fixing holes, wire feeding holes and powder feeding holes. The lower part of the guillotine clamping ring is used to clamp the top plate and bottom plate to be connected.

[0008] The cutting sleeve is equipped with a variable thread, a variable diameter blade, and a hollow inner diameter. The cutting sleeve is fixed to the bottom of the sleeve connecting shaft. The variable diameter blade and the variable thread enable the cutting and feeding of wire.

[0009] The stirring needle is provided with external threads and grooves. The top end of the stirring needle is fixed to the bottom of the stirring needle connecting shaft and is inserted into the cutting sleeve to perform stirring and riveting operations in conjunction with the cutting sleeve.

[0010] The powder feeder and the wire feeder are respectively connected to the clamping ring of the guillotine and convey powder and wire to the cutting sleeve and the stirring needle through the powder feeding hole and the wire feeding hole.

[0011] Preferably, the cutting sleeve includes a fixing thread for connecting with the sleeve connecting shaft, and a disassembly step is provided on the lower side of the fixing thread.

[0012] Preferably, the axial length range of the variable-diameter blade covers the wire feeding hole for cutting the wire.

[0013] Preferably, the groove shape of the stirring pin is triangular, trapezoidal or rectangular, the grooves are evenly distributed on the circumference of the bottom end of the external thread of the stirring pin, the number of grooves is 2 to 6, and the length of the grooves partially extends through the bottom end face of the stirring pin.

[0014] Preferably, the inner wall of the guillotine clamping ring is provided with a guillotine section, a transition section and a spinning section from top to bottom. The wire feeding hole is located on one side of the guillotine section, the variable diameter feather is located in the guillotine section, and the powder feeding hole is located on the side wall of the spinning section.

[0015] Preferably, the angle θ between the center line of the powder feeding hole and the horizontal plane is greater than 20°.

[0016] Preferably, the upper part of the top plate is provided with pre-made holes, the volume of which is equal to the total volume of the powder and particles fed in, which is equal to the volume of the added riveting.

[0017] Preferably, the hardness of the filament is higher than that of the top plate, and the powder is a metallic or non-metallic material.

[0018] Preferably, the metallic material includes scandium, zirconium, niobium and titanium metal powders, and the non-metallic material includes carbon nanotubes, graphene nanosheets and ceramic particles; the reinforcing base powder accounts for less than 8% of the total feeding volume, and the powder diameter is at or below the micrometer level.

[0019] This invention also provides a metallurgical and mechanical connection method using feeding, stirring, and friction riveting, comprising the following steps:

[0020] Holes are pre-formed in the top plate, the volume of which is equal to the total volume of the powder and wire fed in;

[0021] The riveting operation is achieved by inserting the rotating cutting sleeve into the top and bottom plates, while the stirring needle retracts or the cutting sleeve retracts and the stirring needle plunges down, so as to achieve the riveting operation at the predetermined depth.

[0022] The wire is fed into the gap between the cutting sleeve and the clamping ring of the guillotine through the wire feeding hole, and the wire is fed into the riveting area by the variable thread of the cutting sleeve.

[0023] During the feeding process, preheating, feeding, retraction and forming steps are performed to complete the riveting process, wherein the total volume of wire feeding is matched with the volume of the hole;

[0024] The connection of ring rivets can be achieved by using a looping method or the connection of center rivets can be achieved by using a pin-locking method.

[0025] Powder is fed into the clamping ring of the guillotine by a powder feeder. The powder is evenly distributed in the riveting area, and metallurgical bonding between the powder and the wire is achieved through stirring friction during the forming stage.

[0026] This invention provides a metallurgical and mechanical connection device and method for feeding, stirring, and friction riveting. It has the following beneficial effects:

[0027] 1. This invention combines powder and wire stirring friction riveting technology to form a dual connection of metallurgy and machinery, which significantly improves the bonding strength and stability between materials and reduces the detachment and failure phenomena common in traditional connection methods.

[0028] 2. The method of the present invention is applicable to a variety of materials, including various metals (such as aluminum, titanium, and steel) and polymer materials (such as polyamide and polyester), and has broad material compatibility, enabling it to be flexibly applied in multiple industries such as aerospace, automobile manufacturing, and construction.

[0029] 3. This invention provides two different riveting types: ring rivets and center rivets. By adjusting process parameters (such as preheating time, piercing depth, and feeding volume), different connection requirements can be met, significantly improving the flexibility and controllability of the process.

[0030] 4. This invention optimizes material utilization efficiency and reduces material waste in traditional connection methods through precise feeding and powder distribution control. At the same time, it effectively avoids gaps and uneven distribution during the riveting process, reducing the incidence of connection defects.

[0031] 5. This invention shortens the welding process time and improves operational efficiency through integrated device design and optimized operation process, while ensuring the uniformity and strength of each connection part, thus significantly improving the overall welding quality.

[0032] 6. The special materials and structural design of the cutting sleeve, stirring needle and guillotine clamping ring in this invention reduce friction and wear during operation, greatly extend the service life of the equipment, and reduce the maintenance frequency and cost of the equipment. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0034] Figure 2 This is a schematic diagram of the clamping ring structure of the guillotine of the present invention;

[0035] Figure 3 This is a schematic diagram of the cutting sleeve structure of the present invention;

[0036] Figure 4 This is a schematic diagram of the cutting sleeve of the present invention from another perspective;

[0037] Figure 5 This is a schematic diagram of the stirring needle of the present invention;

[0038] Figure 6 This is a schematic diagram of the ring rivet operation in the connection method of the present invention;

[0039] Figure 7 This is a schematic diagram of the operation of the central rivet in the connection method of the present invention.

[0040] The components are as follows: 1. Powder feeder; 2. Wire material; 3. Wire feeder; 4. Electric spindle housing; 5. Cutter clamping ring; 501. Fixing hole; 502. Wire feeding hole; 503. Cutter section; 504. Transition section; 505. Powder feeding hole; 506. Spinning section; 6. Sleeve connecting shaft; 7. Cutting sleeve; 701. Fixing thread; 702. Disassembly step; 703. Variable diameter blade; 704. Variable thread; 705. Hollow inner diameter; 706. First groove; 8. Stirring needle connecting shaft; 9. Stirring needle; 901. Fixing end; 902. External thread; 903. Second groove; 10. Top plate; 11. Bottom plate. Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see the appendix Figure 1 - Appendix Figure 5This invention provides a metallurgical and mechanical connection device for feeding, stirring, friction riveting, including a powder feeder 1, a wire 2, a wire feeder 3, an electric spindle housing 4, a guillotine clamping ring 5, a sleeve connecting shaft 6, a cutting sleeve 7, a stirring needle connecting shaft 8, a stirring needle 9, a top plate 10, and a bottom plate 11.

[0043] Electric spindle housing 4: Used to support and fix other components, providing the overall frame structure of the device. The bottom of the electric spindle housing 4 is directly fixed to the guillotine clamping ring 5 and the powder feeder 1.

[0044] Cutter clamping ring 5: Installed at the bottom of the electric spindle housing 4, it is used to fix and support the cutting sleeve 7 and the stirring needle 9, and to feed the wire 2 and powder material into the riveting area through the wire feeding hole 502 and the powder feeding hole 505 inside. The inside of the cutter clamping ring 5 is provided with a channel for precise positioning and guiding the cutting sleeve 7 and the stirring needle 9.

[0045] Sleeve connecting shaft 6: Fixed inside the electric spindle housing 4. The bottom of the sleeve connecting shaft 6 is connected to the cutting sleeve 7. By transmitting rotational and axial motion forces, the cutting sleeve 7 can achieve precise downward and retraction movements during operation.

[0046] Cutting sleeve 7: It has a structural design with variable thread 704 and variable diameter blade 703. The cutting sleeve 7 is installed at the bottom of the sleeve connecting shaft 6. Its variable thread 704 is used to feed the wire 2, and the variable diameter blade 703 is used to precisely control the cutting and feeding process.

[0047] Stirring pin connecting shaft 8: Fixed inside the electric spindle housing 4, it connects to the top of the stirring pin 9, enabling the stirring pin 9 to perform precise rotation and axial movement during the cutting and riveting process.

[0048] Stirring pin 9: It is provided with a first fixed end 901, an external thread 902 and a second groove 903. The top end of the stirring pin 9 is fixed to the bottom of the stirring pin 9 connecting shaft 8 and it passes through the cutting sleeve 7. In the stages of pressing, feeding, retraction and forming, it realizes the metallurgical and mechanical composite connection of feeding, stirring and friction riveting.

[0049] Powder feeder 1: Precisely feeds powder material into the riveting area through the powder feeding hole 505 in the clamping ring 5 of the guillotine. The powder feeder 1 is fixedly connected to the electric spindle housing 4 and the clamping ring 5 of the guillotine to ensure a stable powder supply during operation.

[0050] Wire feeder 3: The wire 2 is fed into the cutting sleeve 7 through the wire feeding hole 502 in the clamping ring 5 of the guillotine. The wire feeder 3 is connected to the electric spindle housing 4 and the clamping ring 5 of the guillotine to ensure that the wire 2 can be cut and fed smoothly during operation.

[0051] Top plate 10 and bottom plate 11: As workpieces to be connected, top plate 10 and bottom plate 11 are respectively placed below the clamping ring 5 of the guillotine. The top plate 10 has pre-drilled holes, the volume of which is equal to the total volume of the powder and granules fed in, to ensure sufficient filling of the riveting material.

[0052] This device achieves a metallurgical and mechanical composite connection process through the coordinated operation of a series of mechanical components, including feeding, stirring, friction, and riveting. The specific working principle is as follows:

[0053] 1. Preheating Stage: First, the device is started, and the stirring needle 9 and the cutting sleeve 7 rotate and begin initial movement. The guillotine clamping ring 5 fixes the top plate 10 and the bottom plate 11 below the device. The powder feeder 1 and the wire feeder 3 respectively feed the powder and wire 2 into the guillotine clamping ring 5. Through the preheating friction of the cutting sleeve 7, the material is initially heated, preparing for the subsequent riveting process.

[0054] 2. Lowering and feeding stage:

[0055] The rotating cutting sleeve 7 is inserted into the pre-made hole in the top plate 10, and the stirring needle 9 performs a back-pulling or downward-pulling motion, using the variable-diameter blade 703 of the cutting sleeve 7 to cut the wire 2 into granules.

[0056] The wire feeder 3 delivers the wire 2 through the wire feeding hole 502 in the clamping ring 5 of the guillotine to the cutting sleeve 7, and the variable thread 704 pushes the wire 2 further into the riveting area.

[0057] At the same time, the powder feeder 1 feeds the powder material into the gap between the cutting sleeve 7 and the clamping ring 5 of the guillotine through the powder feeding hole 505.

[0058] 3. Retraction and molding stage:

[0059] After feeding is completed, the cutting sleeve 7 and the stirring needle 9 are synchronously pulled back to ensure that the powder and wire 2 are evenly distributed in the riveting hole.

[0060] The bottom surfaces of the cutting sleeve 7 and the stirring needle 9 are pressed down again to reach the predetermined depth, completing the riveting process. At this time, the powder and the wire 2 form a strong connection through metallurgical bonding and mechanical interlocking under the action of stirring friction.

[0061] 4. Finished product inspection and curing stage:

[0062] After the riveting process is completed, the device monitors the riveting quality through a detection system to ensure the strength and uniformity of the connection.

[0063] After the connection is completed, the workpiece cools and solidifies, forming a stable and robust metallurgical and mechanical composite connection structure.

[0064] Material selection and performance

[0065] Material hardness and wear resistance: The materials selected for the cutting sleeve 7, stirring pin 9 and guillotine clamping ring 5 have hardness and wear resistance that are superior to or equal to tungsten rhenium alloy to ensure durability and stability under high stress and high temperature conditions.

[0066] Selection of Powder and Filament 2: The powder material can be a metal (such as scandium, zirconium, niobium, titanium) or a non-metal (such as carbon nanotubes, graphene nanosheets, ceramic particles) to optimize the metallurgical and mechanical properties of the final bond. The volume of the reinforcing powder is controlled to within 8%, and the particle size is at or below the micrometer level.

[0067] Please see the appendix Figure 5 The shape and size parameters of the stirring pin 9 optimize the material flow and bonding effect during the riveting process, ensuring the quality and stability of the metallurgical and mechanical connection.

[0068] Structural features of stirring needle 9

[0069] 1. Design of the fixed end 901 and thread of the stirring needle 9:

[0070] The stirring needle 9 is provided with a first fixed end 901, which is used to fix the stirring needle 9 to the bottom of the stirring needle 9 connecting shaft 8. The stability of the stirring needle 9 during rotation and axial movement is ensured by means of threaded connection.

[0071] The stirring pin 9 has an external thread 902 on its surface. The outer diameter of the thread is DLP, and the inner diameter is DLP', where the difference between DLP and DLP' is greater than 0.1 mm. This thread design provides sufficient structural strength and friction to ensure that materials can be effectively transferred and blended during the stirring process.

[0072] 2. Thread direction and dimensions:

[0073] The external thread 902 is screwed in in the opposite direction to the direction it penetrates the substrate, and the thread rotates in the same direction as the shaft 8 connecting the stirring needle 9. This design helps to increase the friction and mechanical interlocking effect between the material and the substrate during stirring, thereby improving the strength of the riveted connection.

[0074] The pitch of the 902 external thread is less than 5 mm, and the thread length is less than 15 mm. The choice of pitch ensures that the material can be evenly distributed during the stirring friction process, while the limitation of the thread length avoids excessive material accumulation and uneven stress distribution.

[0075] 3. Design of the second groove 903:

[0076] The bottom surface of the external thread 902 of the stirring needle 9 has 2 to 6 second grooves 903 evenly arranged around its circumference. The shape of the second grooves 903 can be triangular, trapezoidal or rectangular to adapt to different material flow characteristics.

[0077] Each second groove 903 partially extends through the bottom surface of the stirring pin 9. The width of the second groove 903 is less than DLP', and the depth of the second groove 903 is less than 5mm. The design of the second groove 903 aims to improve the mixing and dispersion of materials during the stirring process and further enhance the metallurgical and mechanical bonding strength of the connection area.

[0078] In actual operation, when the stirring needle 9 rotates and moves axially:

[0079] The external thread 902 effectively mixes the base material and the riveting material (including powder and wire 2) with each other through its rotation direction and dimensional parameters, and guides the material to flow uniformly in the riveting area;

[0080] The design of the second groove 903 promotes the breaking, mixing and redistribution of materials, effectively reducing material accumulation and void formation, and ensuring the density and connection strength of the riveting area;

[0081] When the stirring pin 9 performs a retraction or piercing operation, the groove also provides an additional cutting action, which helps to remove the surface oxide layer or impurities and improve the quality of the riveting process.

[0082] Through the special design of this stirring pin 9, the device of the present invention achieves efficient and uniform material stirring and dispersion while enhancing the performance of metallurgical and mechanical composite bonding, making it suitable for various material types and complex working conditions. The structural features of the stirring pin 9 ensure the uniformity of materials and bonding strength during the riveting process, resulting in a final connector with excellent mechanical properties and reliable metallurgical bonding.

[0083] Please see the appendix Figure 3 - Appendix Figure 4 The structural design of the cutting sleeve 7 has been further optimized to achieve efficient material mixing during the cutting, feeding, and riveting processes of the wire 2.

[0084] 1. Design of fixing thread 701 and disassembly step 702:

[0085] The cutting sleeve 7 is provided with a fixing thread 701, which is used to securely install the cutting sleeve 7 at the bottom of the sleeve connecting shaft 6 to ensure that it will not loosen during operation.

[0086] The outer surface of the cutting sleeve 7 is provided with a disassembly step 702, on which two parallel grooves are cut. The design of these grooves facilitates the installation and disassembly of the cutting sleeve 7, improving the maintenance and replacement efficiency of the device.

[0087] 2. Dimensional control of hollow inner diameter 705:

[0088] The cutting sleeve 7 has a hollow inner diameter 705 with a diameter of D1, satisfying the condition D1 - DLP = 0.1 - 1 mm. The design of the hollow inner diameter 705 ensures an appropriate gap between the cutting sleeve 7 and the mixing needle 9 to optimize the flow and transfer performance of the material while reducing friction and wear.

[0089] 3. Structure and function of the variable thread 704:

[0090] The cutting sleeve 7 is provided with a variable thread 704. The rotation direction of the variable thread 704 is the same as that of the sleeve connecting shaft 6, but its screwing direction is opposite to the direction of piercing into the base material. This design enables the variable thread 704 to effectively push the wire 2 into the riveting area during rotation and generate a reverse force to maintain the stable position of the material.

[0091] The length of the variable thread 704 is less than 100 mm. Its inner thread diameter is DLS', outer diameter is DLS, and it satisfies DLS - DLS' > 0.1 mm. The top and root bottom widths DLSD of the thread respectively satisfy 2*D < DLSD < D. This size design optimizes the strength of the thread and the grasping effect of the material, preventing the wire 2 from slipping or shifting in position.

[0092] 4. Distribution and shape of the first groove 706:

[0093] There are 2 to 6 first grooves 706 evenly distributed on the bottom circumference of the variable thread 704. The shape of the first groove 706 can be triangular, trapezoidal or rectangular. The length of each first groove 706 partially cuts into the bottom feeding surface of the cutting sleeve 7. The width of the first groove 706 is less than DLS', and the depth of the first groove 706 is less than 10 mm.

[0094] The design of these first grooves 706 helps to break and disperse the material during the cutting and feeding processes, enabling the material to be more evenly distributed in the riveting area, reducing the risk of accumulation and blockage, and improving the density and strength of the connection.

[0095] 5. Design of the variable diameter feather edge 703:

[0096] The diameter of the variable diameter feather edge 703 of the cutting sleeve 7 is D2. The distance between the bottom end face and the root of the variable diameter feather edge 703 is less than H1 - (D / 2) mm. The length of the variable diameter feather edge 703 always covers the wire feeding hole 502, ensuring continuous wire feeding during the cutting process of the wire 2.

[0097] The structural design of the variable diameter feather edge 703 helps to precisely control the cutting process of the wire 2. Through the rotational movement of the feather edge, precise cutting force and evenly distributed material particles are formed, thereby optimizing the material filling and bonding effects in the riveting area.

[0098] In actual operation, the cutting sleeve 7 is designed to perform the following key functions:

[0099] 1. Precise feeding and cutting:

[0100] With the design of the fixing thread 701 and the disassembly step 702, the cutting sleeve 7 is securely installed on the sleeve connecting shaft 6, ensuring sufficient stability during operation. The precise dimensions of the hollow inner diameter 705, in conjunction with the stirring needle 9, achieve a tight coaxial clearance fit.

[0101] During the feeding stage, the variable thread 704 pushes the wire 2 into the riveting area and achieves precise cutting operation with the assistance of the variable diameter feather blade 703. The cut material particles enter the riveting area evenly.

[0102] 2. Material dispersion and mixing:

[0103] Through the design of the first groove 706 at the bottom, the cutting sleeve 7 can effectively break and disperse material particles during feeding and retraction, avoid material accumulation and agglomeration, and improve the uniformity of the material in the connection area and the metallurgical bonding effect.

[0104] 3. Optimize material flow and filling:

[0105] The variable-diameter feather blade 703 covers the wire feeding hole 502 during cutting and feeding, ensuring uniform flow and filling of material in the riveting area. Combined with the functional design of the variable thread 704 and the first groove 706, an efficient, stable, and high-quality connection is achieved in the riveting process.

[0106] Through the above structural and operational design, the cutting sleeve 7 plays a crucial role in the metallurgical and mechanical connection device of the present invention, ensuring the efficiency, reliability and quality stability of the riveting process.

[0107] Please see the appendix Figure 2 The structural design of the clamping ring 5 of the guillotine plays a key role in achieving precise feeding, powder distribution, and material bonding.

[0108] 1. Setting of fixing hole 501, wire feeding hole 502 and powder feeding hole 505:

[0109] Fixing hole 501: used to fix the guillotine clamping ring 5 to the bottom of the electric spindle housing 4 to provide a stable base structure for the device and ensure that the guillotine clamping ring 5 remains stable and stationary during operation.

[0110] Wire feeding hole 502: Located in the guillotine section 503, with a diameter of D4, satisfying D4>D+0.05mm, and its vertical distance from the bottom end face of the guillotine clamping ring 5 is H1. The wire feeding hole 502 is used to precisely guide the wire 2 into the cutting sleeve 7, ensuring that the wire 2 can be stably and continuously fed into the riveting area.

[0111] Powder feeding hole 505: Located on the side wall of the cutting sleeve 7, its angle θ with the horizontal plane is greater than 20°. The powder feeding hole 505 controls the powder feeding angle to ensure that the powder material enters the riveting area evenly, thereby improving the material distribution effect.

[0112] 2. Design of the guillotine section 503:

[0113] The inner diameter of the guillotine section 503 is set to D3, satisfying D3 = D2 + 0.1~1mm, ensuring that the material can pass smoothly through the guillotine section 503 during cutting and feeding. The inner diameter of the guillotine section 503 is designed to be slightly larger than the diameter (D2) of the variable diameter blade 703 of the cutting sleeve 7, thereby providing sufficient operating space while ensuring the stability of the guillotine section 503 during feeding.

[0114] 3. Structure of the spinning section 506:

[0115] The center inner diameter of the spinning section 506 is D5, which satisfies D5 = DLS + 0.1~1mm. The spinning section 506 is located at the top of the clamping ring 5 of the guillotine and is used to spin the incoming material to ensure that the material can be uniformly clamped during the riveting process, forming a stable metallurgical and mechanical bond.

[0116] The inner diameter design of the spinning section 506 ensures that the material can be fully compressed after entering the riveting zone, while preventing the material from overflowing or being lost during friction and rotation.

[0117] 4. Setting the transition section 504:

[0118] The inner diameter design of the transition section 504: Located between the guillotine section 503 and the spinning section 506, the inner diameter smoothly transitions from D3 to D5 using a rounded corner transition method. This design helps reduce material resistance and wear during the flow process, ensuring a smooth and continuous transition of material to the spinning area during riveting.

[0119] Functions and operation of clamping ring 5 of guillotine

[0120] 1. Precise material feeding and distribution:

[0121] Through the wire feeding hole 502 located in the guillotine section 503, the wire 2 is precisely guided into the cutting sleeve 7, achieving continuous and stable feeding. The diameter and position design of the wire feeding hole 502 ensures that the wire 2 will not deviate or be obstructed during the feeding process, maximizing the efficiency and stability of feeding.

[0122] 2. Uniform supply and distribution of powder:

[0123] The powder feeding hole 505 is designed with an angle (θ>20°) relative to the horizontal plane in mind, allowing the powder to enter the riveting area at an appropriate angle and ensuring uniform powder distribution during the riveting process. This design prevents powder accumulation or uneven distribution, improving the material filling effect in the riveting area and the final bonding quality.

[0124] 3. Stable material compression and molding:

[0125] The spinning portion 506 of the guillotine clamping ring 5 provides a space for spinning the material. Its central inner diameter (D5) design ensures uniform clamping and curing of the material during the riveting process. The rounded transition inner diameter design of the transition portion 504 reduces friction and resistance as the material moves from the guillotine portion 503 to the spinning portion 506, ensuring smooth material flow.

[0126] 4. Reduce friction and wear:

[0127] Through the rounded transition design of the transition section 504, the clamping ring 5 of the guillotine reduces the resistance to material flow and the wear of the device during operation, extends the service life of the device, and ensures the continuity and stability of material flow.

[0128] Through the optimized design of the structure and function described above, the guillotine clamping ring 5 plays a crucial supporting and controlling role in the metallurgical and mechanical connection device of the present invention, which uses feeding, stirring, and friction riveting. Its precise hole diameter and position design, reasonable inner diameter transition, and suitable powder conveying angle ensure effective bonding and stable distribution of materials during the riveting process, greatly improving the effect and reliability of the metallurgical and mechanical composite connection.

[0129] Please see the appendix Figure 6 - Appendix Figure 7 The present invention also provides a metallurgical and mechanical connection method for feeding, stirring and friction riveting, which is applicable to the connection of various materials and the repair of in-situ defects.

[0130] The connection method includes the following main stages: preheating, insertion (pin-type or loop-type), feeding, retraction, and forming. The riveting process will vary depending on the type of rivet (ring rivets and center rivets). The specific steps are as follows:

[0131] 1. Pre-welding preparations:

[0132] Pre-welding preparation includes removing oil stains from the top plate 10 and bottom plate 11, removing residual metal from the tool surface, and ensuring that the welding surface is clean and free of impurities.

[0133] Match the appropriate tooling fixtures to ensure the fixation and stability of the workpiece during the welding process.

[0134] Pre-drill holes in the top plate 10. The volume V of the holes should be equal to the total volume of the powder and granules to be fed in, to ensure that the reinforcing material is fully filled and tightly bonded.

[0135] 2. Select rivet type:

[0136] Determine the required rivet type. If you choose a ring rivet, proceed to step 3; if you choose a center rivet, proceed to step 4.

[0137] 3. Welding process of ring rivets:

[0138] The root of the cutting sleeve 7 and the stirring needle 9 first undergoes an initial axial movement to a position of -0.1mm to preheat the upper surface of the top plate 10 by squeezing and rubbing, with a duration of t0.

[0139] Subsequently, a sleeve-type operation method is adopted: the cutting sleeve 7 is axially tucked down to the absolute position -H mm within time t1, while the stirring needle 9 is axially retracted to the position determined by the following formula within time t1:

[0140]

[0141] During the feeding stage, the total volume of wire 2 fed into the riveting area is V. Subsequently, the cutting sleeve 7 and the stirring needle 9 are pulled back to the initial surface position of the top plate 10 within time t2.

[0142] Finally, the bottom surfaces of the cutting sleeve 7 and the stirring needle 9 are pressed down to a certain depth x to complete the forming stage, thereby achieving the welding of the ring rivet.

[0143] 4. Center rivet welding process:

[0144] Similarly, the roots of the cutting sleeve 7 and the stirring needle 9 first undergo an initial axial movement to a position of -0.1mm to preheat the upper surface of the top plate 10 by squeezing and rubbing, with a duration of t0.

[0145] Subsequently, a needle-piercing operation method is adopted: the cutting sleeve 7 is driven downward along the axis, and the stirring needle 9 is driven down to the absolute position -H mm within time t1. At the same time, the cutting sleeve 7 is axially pulled back to the position determined by the following formula within time t1:

[0146]

[0147] During the feeding stage, the total volume of wire 2 fed into the riveting area is V. Subsequently, the cutting sleeve 7 and the stirring needle 9 are pulled back to the initial surface position of the top plate 10 within time t2.

[0148] Finally, the bottom surfaces of the cutting sleeve 7 and the stirring needle 9 are pressed down to a certain depth x to complete the forming stage, thereby achieving the welding of the central rivet.

[0149] This method is applicable to a variety of materials for in-situ defect repair, including all metals and polymers capable of friction stir welding. For example, it can be used with metals such as aluminum, steel, and titanium, as well as polymers such as polyamide and polyester. This versatility makes the method widely applicable and flexible in various industrial applications.

[0150] Riveting structures can include rivets and studs. Rivet structures are suitable for local connections or repairs requiring high local strength; stud structures are used for larger areas or areas requiring more evenly distributed connection points. This design improves the adaptability and practicality of the device under different connection requirements.

[0151] Through the above steps, the method of this invention enables efficient and stable riveting connections in metallurgical and mechanical joining processes. The use of both ring rivets and center rivets provides adaptability to different application scenarios, ensuring excellent material bonding under various connection requirements. Furthermore, the riveting structure design, applicable to various metals and polymer materials, makes this method widely applicable in aerospace, automotive manufacturing, construction, and other fields.

[0152] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A feed-stir friction-increased-riveted metallurgical and mechanical connection device, characterized by, The utility model relates to a kind of ring type rivet connection device, including: Electric spindle shell for fixing and supporting the components of device; Lathe compression ring, fixed to the bottom of the electric spindle shell, inner wall is equipped with fixed hole, wire feeding hole and powder feeding hole, the lower part of the lathe compression ring is used to compress the top plate and bottom plate to be connected; Cutting sleeve is equipped with variable thread, variable diameter feather and hollow inner diameter, the cutting sleeve is fixed in the bottom of sleeve connecting shaft, and wire cutting and feeding are realized by variable diameter feather and variable thread;The sleeve connecting shaft realizes the down and back and forth movement of cutting sleeve in the working process by transmitting rotation and axial motion force; Stirring needle is equipped with external thread and groove, the top of the stirring needle is fixed in the bottom of stirring needle connecting shaft, and it is inserted into the cutting sleeve, and it is combined with cutting sleeve to stir and increase rivet operation; Powder feeder and wire feeder are respectively connected to the lathe compression ring, and powder and wire are transported to the cutting sleeve and stirring needle through the powder feeding hole and wire feeding hole; The axial length range of the variable diameter feather covers the wire feeding hole, and is used for cutting wire; The inner wall of the lathe compression ring is sequentially equipped with lathe part, transition part and spinning part from top to bottom, the wire feeding hole is located on one side of lathe part, the variable diameter feather is located in lathe part, and the powder feeding hole is located in the side wall of spinning part; The inner diameter of the lathe part is set as D3, the diameter of the variable diameter feather is set as D2, and D3=D2+0.1-1mm is satisfied.

2. The friction stir based feeding and mixing process for metallurgical and mechanical joining of claim 1, wherein, The cutting sleeve includes a fixing thread for connecting with the sleeve connecting shaft, and a disassembly step is arranged on the lower side of the fixing thread.

3. The friction stir based feeding and mixing process for metallurgical and mechanical joining as claimed in claim 1 wherein, The groove shape of the stirring needle is triangle, trapezoid or rectangle, the grooves are uniformly distributed on the bottom end circumference of the external thread of the stirring needle, the number of grooves is 2-6, and the length of the grooves partially penetrates the bottom end surface of the stirring needle.

4. The friction stir based feeding and mixing process for metallurgical and mechanical joining as claimed in claim 1 wherein, The included angle θ between the center line of the powder feeding hole and the horizontal plane is greater than 20°.

5. The friction stir based feeding and mixing process for metallurgical and mechanical joining as claimed in claim 1 wherein, The top plate is provided with a prefabricated hole in the upper part, and the volume of the hole is equal to the total volume of the powder and wire fed in and the volume of the increased rivet.

6. The friction stir based feeding and mixing process for metallurgical and mechanical joining as claimed in claim 1 wherein, The hardness of the wire is higher than that of the top plate, and the powder is metal material or non-metal material.

7. The friction stir based feeding and mixing process for metallurgical and mechanical joining as claimed in claim 6 wherein, The metal material includes scandium, zirconium, niobium and titanium metal powder, and the non-metal material includes carbon nanotube, graphene nanosheet and ceramic particle.

8. A method of feeding and friction stir enhanced riveting of metallurgical and mechanical joints, using the feeding and friction stir enhanced riveting of metallurgical and mechanical joints device according to any one of claims 1 to 7, characterized in that, The total volume of the powder and wire fed in is equal to the volume of the prefabricated hole in the top plate. The stirring needle is inserted into the top plate and the bottom plate through the cutting sleeve, and the stirring needle is retracted or the cutting sleeve is retracted, so that the rivet is increased to the predetermined depth. The wire is fed into the gap between the cutting sleeve and the lathe compression ring through the wire feeding hole, and the wire is fed into the riveting area by the variable thread of the cutting sleeve. During feeding, preheating, feeding, retraction and forming steps are performed to complete the riveting process. The sleeve insertion type is used to realize the connection of ring type rivet, or the needle insertion type is used to realize the connection of center rivet. The powder is uniformly distributed in the rivet increasing area by the powder feeder, and the metallurgical combination of the powder and the wire is realized by stirring and friction in the forming stage. ​

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