Metallurgical and mechanical connecting device and method for feeding, stirring, friction and rivet increasing

Abstract

The invention relates to the field of material connection, and discloses a metallurgical and mechanical connecting device and method for feeding, stirring, friction and riveting, and the device comprises a powder feeder, a wire, a wire feeder, an electric spindle shell, a cutting bed pressing ring, a sleeve connecting shaft, a cutting sleeve, a stirring needle connecting shaft, a stirring needle, a top plate and a bottom plate. According to the device, the chopping bed pressing ring and the powder feeder are fixed through the electric spindle shell, the cutting sleeve is in coaxial clearance fit with the stirring needle, cutting and feeding of wires are achieved through variable threads of the cutting sleeve, and metallurgical and mechanical composite connection of powder and the wires is completed through cooperation of the stirring needle. The method is divided into two rivet increasing types, namely an annular rivet and a central rivet, and efficient connection and in-situ defect repair of various metals and high polymer materials are realized through the steps of preheating, pricking, feeding, withdrawing, forming and the like. The method improves the connection strength and the 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] The invention relates to the technical field of material connection, and in particular to a metallurgical and mechanical connection device and method for feeding, stirring, friction and riveting. Background Art

[0002] In modern manufacturing, material connection technology is crucial, especially in the fields of aerospace, automobile manufacturing, mechanical processing, etc. The quality of connection technology directly affects the performance and service life of the product. Although traditional connection methods, such as welding and riveting, are widely used, they often have many limitations when dealing with different materials, complex structures and high strength requirements. Especially when connecting lightweight and dissimilar materials, traditional technologies are prone to problems such as insufficient connection strength and weak interface bonding. In addition, traditional welding and riveting processes are usually complicated and require multi-step preparation and processing, resulting in low production efficiency. At the same time, these methods may produce a large heat-affected zone during the processing process, resulting in a decrease in material performance and even welding defects such as cracks and holes, which seriously affects the final connection quality.

[0003] In addition, with the increasing requirements for lightweight and high performance of materials, traditional processes have shown great limitations in connecting polymer materials and metal materials, making it difficult to achieve uniform and strong connections. The existing riveting technology still has a lot of room for improvement in material adaptability, process stability, and connection strength. Especially when in-situ defect repair is required, traditional methods often cannot provide sufficient repair effects. Therefore, the development of a metallurgical and mechanical composite connection technology that can effectively improve connection strength, adapt to a variety of materials, and simplify the process flow has become a key need to solve the above problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a metallurgical and mechanical connection device and method for feeding stirring friction riveting, which solves the problems of insufficient material connection strength, complex process and limited range of applicable materials in the prior art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a metallurgical and mechanical connection device for feeding stir friction riveting, comprising:

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

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

[0008] The cutting sleeve is provided with a variable thread, a variable diameter feather blade and a hollow inner diameter. The cutting sleeve is fixed at the bottom of the sleeve connecting shaft, and the cutting and feeding of the wire are realized by the variable diameter feather blade and the variable thread;

[0009] A stirring needle is provided with an external thread and a groove, the top end of the stirring needle is fixed to the bottom of the stirring needle connecting shaft, penetrates into the cutting sleeve, and cooperates with the cutting sleeve to perform stirring and riveting operations;

[0010] The powder feeder and the wire feeder are respectively connected to the clamping ring of the guillotine bed, 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 comprises a fixing thread for connecting with the sleeve connecting shaft, and a disassembly step is provided at the lower side of the fixing thread.

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

[0013] Preferably, the groove of the stirring needle is in the shape of a triangle, a trapezoid or a rectangle, and the grooves are evenly distributed on the circumference of the bottom end of the external thread of the stirring needle. The number of grooves is 2 to 6, and the length of the groove partially passes through the bottom end surface of the stirring needle.

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

[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 portion of the top plate is provided with prefabricated holes, and the volume of the holes = the total volume of the powder and particles fed in = the volume of the added rivets.

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

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

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

[0020] Prefabricate holes on the top plate, wherein the volume of the holes is equal to the total volume of the powder and wire fed into the top plate;

[0021] The top plate and the bottom plate are penetrated by the rotating cutting sleeve, and the stirring needle is withdrawn or the cutting sleeve is withdrawn and the stirring needle is pushed down to realize the riveting operation of 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 using 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, in which the total volume of wire feeding is matched with the volume of the hole;

[0024] The ring rivet connection is realized by sleeve rivet connection or the center rivet connection is realized by needle rivet connection;

[0025] The powder is transported to the inside of the clamping ring of the guillotine machine through a powder feeder, the powder is evenly distributed in the riveting area, and the metallurgical bonding of the powder and the wire is achieved through stirring friction during the forming stage.

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

[0027] 1. The present invention forms a dual connection of metallurgy and mechanics by combining the stir friction riveting technology of powder and wire, which significantly improves the bonding strength and stability between materials and reduces the common falling off and failure phenomena in traditional connection methods.

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

[0029] 3. The present invention provides two different types of rivets: ring rivets and center rivets, and meets different connection requirements by adjusting process parameters (such as preheating time, piercing depth, feeding volume, etc.), which significantly improves the process flexibility and operational controllability.

[0030] 4. The present invention optimizes the use efficiency of materials and reduces the waste of materials 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 and reduces the incidence of connection defects.

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

[0032] 6. The special materials and structural design of the cutting sleeve, stirring needle and guillotine clamping ring of the present 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0037] Figure 5 A schematic diagram of a stirring pin of the present invention;

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

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

[0040] Among them, 1. powder feeder; 2. wire material; 3. wire feeder; 4. electric spindle housing; 5. guillotine clamping ring; 501. fixing hole; 502. wire feeding hole; 503. guillotine part; 504. transition part; 505. powder feeding hole; 506. spinning part; 6. sleeve connecting shaft; 7. cutting sleeve; 701. fixed thread; 702. disassembly step; 703. variable diameter feather blade; 704. variable thread; 705. hollow inner diameter; 706. first groove; 8. stirring needle connecting shaft; 9. stirring needle; 901. fixed end; 902. external thread; 903. second groove; 10. top plate; 11. bottom plate. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Please see attached Figure 1 -Attached Figure 5The embodiment of the present invention provides a metallurgical and mechanical connection device for feeding stirring friction riveting, including a powder feeder 1, a wire material 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] The electric spindle housing 4 is used to support and fix other components and provide the overall frame structure of the device. The bottom of the electric spindle housing 4 is directly fixed with the guillotine clamping ring 5 and the powder feeder 1.

[0044] Guillotine 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 the powder material into the riveting area through the wire feeding hole 502 and the powder feeding hole 505 inside it. The inside of the guillotine clamping ring 5 is provided with a channel for accurately 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, and by transmitting rotation and axial movement force, the cutting sleeve 7 can achieve precise downward and retracting movement during the working process.

[0046] The cutting sleeve 7 has a structural design of a variable thread 704 and a variable diameter feather blade 703. The cutting sleeve 7 is installed at the bottom of the sleeve connecting shaft 6. The variable thread 704 is used to realize the feeding of the wire 2, and the variable diameter feather blade 703 is used to accurately control the cutting and feeding process.

[0047] Stirring needle connecting shaft 8: fixed inside the electric spindle housing 4, connected to the top of the stirring needle 9, so that the stirring needle 9 can perform precise rotation and axial movement during the cutting and riveting process.

[0048] Stirring needle 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 needle 9 is fixed to the bottom of the stirring needle 9 connecting shaft 8, and it is inserted into the cutting sleeve 7, cooperating with the cutting sleeve 7 in the lowering, feeding, retracting and forming stages to realize the metallurgical and mechanical composite connection of feeding stirring friction riveting.

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

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

[0051] Top plate 10 and bottom plate 11: As the workpieces to be connected, top plate 10 and bottom plate 11 are respectively placed under the guillotine clamping ring 5. Holes are prefabricated on the top plate 10, and their volume is equal to the total volume of the powder and particles fed in to ensure that the riveting material is fully filled.

[0052] The device realizes the metallurgical and mechanical composite connection process of feeding, stirring, friction and riveting through the coordinated work of a series of mechanical components. 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 start preliminary movement. The guillotine clamping ring 5 fixes the top plate 10 and the bottom plate 11 under the device. The powder feeder 1 and the wire feeder 3 respectively feed the powder and the wire 2 into the guillotine clamping ring 5. Through the preheating friction of the cutting sleeve 7, the material is preliminarily heated to prepare for the subsequent riveting process.

[0054] 2. Tie down and feeding stage:

[0055] The rotating cutting sleeve 7 penetrates into the prefabricated hole of the top plate 10, and the stirring needle 9 performs a retracting or downward penetration movement, and the diameter-changing feather blade 703 of the cutting sleeve 7 is used to cut the wire material 2 into particles.

[0056] The wire feeder 3 delivers the wire 2 into the cutting sleeve 7 through the wire feeding hole 502 in the clamping ring 5 of the guillotine, and the variable thread 704 pushes the wire 2 to be further fed 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 guillotine pressing ring 5 through the powder feeding hole 505 .

[0058] 3. Withdrawal and forming stage:

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

[0060] The bottom end surfaces of the cutting sleeve 7 and the stirring needle 9 are pressed down again to reach a predetermined depth position, completing the riveting forming 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 testing 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 workpieces cool and solidify to form a stable and strong metallurgical and mechanical composite connection structure.

[0064] Material selection and performance

[0065] Material hardness and wear resistance: The material selection hardness and wear resistance of the cutting sleeve 7, stirring needle 9 and guillotine clamping ring 5 are better than or equal to tungsten-rhenium alloy to ensure durability and stability under high stress and high temperature conditions.

[0066] Selection of powder and wire 2: Powder materials can be metal (such as scandium, zirconium, niobium, titanium) or non-metal (such as carbon nanotubes, graphene nanosheets, ceramic particles) to optimize the metallurgical and mechanical properties of the final connection. The volume of the reinforcement base powder is controlled within 8%, and the particle size is micron-level and below.

[0067] Please see attached Figure 5 The shape and size parameters of the stirring needle 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. The fixed end 901 and thread design of the stirring needle 9:

[0070] The stirring needle 9 is provided with a first fixed end 901 for fixing the stirring needle 9 at the bottom of the stirring needle 9 connecting shaft 8, and ensuring the stability of the stirring needle 9 during rotation and axial movement through a threaded connection.

[0071] The surface of the stirring needle 9 is provided with an external thread 902, the outer diameter of the thread is DLP, the inner diameter is DLP', and the difference between DLP-DLP' is greater than 0.1 mm. Such a thread design provides sufficient structural strength and friction to ensure that the materials can be effectively transferred and fused during the stirring process.

[0072] 2. Thread direction and size:

[0073] The screwing direction of the external thread 902 is opposite to the direction of piercing the substrate, and the thread and the stirring needle 9 have the same rotation direction as the connecting shaft 8. This design helps to increase the friction and mechanical interlocking effect between the material and the substrate during the stirring process, and improves the strength of the riveted connection.

[0074] The pitch of the external thread 902 is less than 5 mm, and the length of the thread is less than 15 mm. The selection of the pitch ensures that the material can be evenly distributed during the friction stir 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] There are 2 to 6 second grooves 903 evenly distributed in a row on the circumference of the bottom end surface of the external thread 902 of the stirring needle 9. The shape of the second groove 903 can be a triangle, a trapezoid or a rectangle to adapt to different material flow characteristics.

[0077] The length of each second groove 903 partially penetrates the bottom end surface of the stirring needle 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 second groove 903 is designed to improve the mixing and dispersion effect of the material 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 stirs the base material and the riveting material (including the powder and the wire 2) with each other through its rotation direction and size parameters, and guides the material to flow evenly in the riveting area;

[0080] The design of the second groove 903 promotes the crushing, mixing and redistribution of materials, effectively reduces the accumulation of materials and the formation of voids, and ensures the compactness and connection strength of the riveting area;

[0081] When the stirring needle 9 is retracted or plunged, the groove also provides 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 the stirring needle 9, the device of the present invention can achieve efficient and uniform material stirring and dispersion while enhancing the performance of metallurgical and mechanical composite connection, and is suitable for various material types and complex working conditions. The structural characteristics of the stirring needle 9 ensure the uniformity and bonding strength of the material during the riveting process, so that the final connection has excellent mechanical properties and reliable metallurgical bonding.

[0083] Please refer to the attached Figure 3 -Attached Figure 4 The structural design of the cutting sleeve 7 is further optimized to achieve efficient material mixing effect during the wire 2 cutting, feeding and riveting process.

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

[0085] The cutting sleeve 7 is provided with a fixing thread 701 for firmly mounting the cutting sleeve 7 on 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 grooves are cut in parallel. The design of these grooves facilitates the installation and disassembly operations of the cutting sleeve 7, thereby improving the maintenance and replacement efficiency of the device.

[0087] 2. Dimension 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 to 1 mm. The design of the hollow inner diameter 705 ensures an appropriate gap between the cutting sleeve 7 and the stirring needle 9 to optimize the flow and transmission 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', and its outer thread diameter is DLS, and DLS - DLS' > 0.1 mm is satisfied. The top and root thread 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 to ensure continuous wire feeding operation 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 design of the cutting sleeve 7 plays the following key functions:

[0099] 1. Precise feeding and cutting:

[0100] Through the design of the fixing thread 701 and the disassembly step 702, the cutting sleeve 7 is firmly mounted on the sleeve connecting shaft 6, ensuring sufficient stability during operation. The precise size of the hollow inner diameter 705 matches the stirring needle 9 to achieve a close coaxial clearance fit.

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

[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 retracting, 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 the cutting and feeding process, ensuring uniform flow and filling of the 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 during the riveting process.

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

[0107] Please see attached Figure 2 The structural design of the guillotine pressing ring 5 plays a key role in achieving accurate feeding, powder distribution and material combination.

[0108] 1. The setting of the fixing hole 501, the wire feeding hole 502 and the 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 basic structure for the device and ensure that the guillotine clamping ring 5 remains stable and motionless during operation.

[0110] Wire feeding hole 502: It is located in the guillotine part 503, with a diameter of D4, satisfying D4>D+0.05mm, and the vertical distance between the position and the bottom end surface of the guillotine clamping ring 5 is H1. The wire feeding hole 502 is used to accurately guide the wire 2 into the cutting sleeve 7 to ensure 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, the angle θ between the powder feeding hole 505 and the horizontal plane is greater than 20°. The powder feeding hole 505 controls the conveying angle of the powder to ensure that the powder material enters the riveting area evenly, thereby improving the distribution effect of the material.

[0112] 2. Design of the guillotine bed part 503:

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

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

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

[0116] The inner diameter design of the spinning portion 506 ensures that the material can be fully compressed after entering the riveting area, and the material will not overflow or be lost during the friction and rotation process.

[0117] 4. Setting of transition part 504:

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

[0119] Function and operation of the guillotine clamping ring 5

[0120] 1. Accurate feeding and distribution of materials:

[0121] The wire 2 is accurately guided into the cutting sleeve 7 through the wire feeding hole 502 provided in the guillotine part 503, thereby achieving continuous and stable feeding. The diameter and position design of the wire feeding hole 502 ensure that the wire 2 will not be deflected or blocked during the feeding process, thereby maximizing the efficiency and stability of the feeding.

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

[0123] The design of the powder feeding hole 505 takes into account the angle with the horizontal plane (θ>20°), so that the powder can enter the riveting area at an appropriate angle, ensuring that the powder is evenly distributed during the riveting process. This design can prevent powder accumulation or uneven distribution, improve the material filling effect of the riveting area and the final bonding quality.

[0124] 3. Stable material compaction and molding:

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

[0126] 4. Reduce friction and wear:

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

[0128] Through the above optimized design of structure and function, the guillotine clamping ring 5 plays an important supporting and controlling role in the metallurgical and mechanical connection device of the present invention for feeding stir friction riveting. Its precise aperture and position design, reasonable inner diameter transition and appropriate powder conveying angle ensure the effective combination and stable distribution of materials in the riveting process, greatly improving the effect and reliability of metallurgical and mechanical composite connection.

[0129] Please see attached Figure 6 -Attached Figure 7 The present invention also provides a metallurgical and mechanical connection method of feeding stirring friction riveting, which is suitable for connecting a variety of materials and repairing defects in situ.

[0130] The connection method includes the following main stages: preheating, lower rivet (needle rivet or sleeve rivet), feeding, retraction and forming. The riveting process will be different according to the requirements of different types of rivets (ring rivets and center rivets). The specific steps are as follows:

[0131] 1. Preparation before welding:

[0132] The preparation before welding is performed, including removing the oil stains on the top plate 10 and the bottom plate 11, removing the residual metal on the surface of the tool, and ensuring that the welding surface is clean and free of impurities.

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

[0134] Holes are preformed on the top plate 10, and the volume V of the holes should be equal to the total volume of the powder and particles to be fed in, so as to ensure sufficient filling and tight bonding of the riveting material.

[0135] 2. Select the rivet type:

[0136] Determine the type of rivet you want and proceed to step 3 if you chose a ring rivet or step 4 if you chose a center rivet.

[0137] 3. Ring rivet welding process:

[0138] The cutting sleeve 7 and the root of the stirring needle 9 first make a preliminary axial movement to the position of -0.1 mm to squeeze and rub the upper surface of the top plate 10 for preheating, and the duration is t0.

[0139] Then, the sleeve-tying operation mode is adopted: the cutting sleeve 7 is axially pierced down to the absolute position -H mm within the time t1, and the stirring needle 9 is axially withdrawn within the time t1 to the position determined by the following formula:

[0140]

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

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

[0143] 4. Center rivet welding process:

[0144] Similarly, the cutting sleeve 7 and the root of the stirring needle 9 first make a preliminary axial movement to the position of -0.1 mm to squeeze and rub the upper surface of the top plate 10 for preheating, and the duration is t0.

[0145] Then, the needle-piercing operation mode is adopted: the cutting sleeve 7 is pierced downward along the axial direction, and the stirring needle 9 is pierced downward to the absolute position -H mm within the time t1, and at the same time, the cutting sleeve 7 is axially withdrawn within the time t1 to the position determined by the following formula:

[0146]

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

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

[0149] The method is applicable to a variety of materials for in-situ defect repair, including all metals and polymer materials that can be subjected to friction stir welding. For example, metal materials such as aluminum, steel, and titanium can be used, as well as polymer materials such as polyamide and polyester. This multi-material applicability makes the method widely applicable and flexible in various industrial applications.

[0150] The riveting structure may include rivets and rivet column structures. The rivet structure is suitable for local connection or repair of areas that require higher local strength; the rivet column structure is used in areas with larger areas or areas that require 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 the present invention can achieve efficient and stable riveting connection in the process of metallurgical and mechanical connection. The two welding methods of ring rivets and center rivets provide adaptability to different application scenarios, ensuring that excellent material bonding effects can be achieved under various connection requirements. At the same time, the riveting structure design suitable for a variety of metals and polymer materials makes this method have broad application prospects in the fields of aerospace, automobile manufacturing, construction, etc.

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

Claims

1. A metallurgical and mechanical connection device for feeding, stirring, friction and riveting, characterized in that: include: The electric spindle housing is used to fix and support the various components of the device; The guillotine bed clamping ring is fixed to the bottom of the electric spindle housing, and the inner wall is provided with a fixing hole, a wire feeding hole and a powder feeding hole. The lower part of the guillotine bed clamping ring is used to clamp the top plate and the bottom plate to be connected; The cutting sleeve is provided with a variable thread, a variable diameter feather blade and a hollow inner diameter. The cutting sleeve is fixed at the bottom of the sleeve connecting shaft, and the cutting and feeding of the wire are realized by the variable diameter feather blade and the variable thread; A stirring needle is provided with an external thread and a groove, the top end of the stirring needle is fixed to the bottom of the stirring needle connecting shaft, penetrates into the cutting sleeve, and cooperates with the cutting sleeve to perform stirring and riveting operations; The powder feeder and the wire feeder are respectively connected to the clamping ring of the guillotine bed, and convey powder and wire to the cutting sleeve and the stirring needle through the powder feeding hole and the wire feeding hole.

2. The metallurgical and mechanical connection device of feeding stir friction riveting according to claim 1 is characterized in that: The cutting sleeve comprises a fixing thread for connecting with the sleeve connecting shaft, and a disassembly step is arranged at the lower side of the fixing thread.

3. The metallurgical and mechanical connection device of feeding stir friction riveting according to claim 1 is characterized in that: The axial length range of the variable diameter feather blade covers the wire feeding hole and is used for cutting the wire.

4. The metallurgical and mechanical connection device of feeding stir friction riveting according to claim 1 is characterized in that: The groove of the stirring needle is in the shape of a triangle, a trapezoid or a rectangle, and the grooves are evenly distributed on the circumference of the bottom end of the external thread of the stirring needle. The number of grooves is 2 to 6, and the length of the groove partially passes through the bottom end surface of the stirring needle.

5. The metallurgical and mechanical connection device of feeding stir friction riveting according to claim 1 is characterized in that: The inner wall of the guillotine bed clamping ring is provided with a guillotine bed part, a transition part and a spinning part in sequence from top to bottom, the wire feeding hole is located on one side of the guillotine bed part, the diameter-changing feather blade is located on the guillotine bed part, and the powder feeding hole is located on the side wall of the spinning part.

6. The metallurgical and mechanical connection device of feeding stir friction riveting according to claim 5 is characterized in that: The angle θ between the center line of the powder feeding hole and the horizontal plane is greater than 20°.

7. The metallurgical and mechanical connection device of feeding stir friction riveting according to claim 1 is characterized in that: The upper part of the top plate is provided with prefabricated holes, and the volume of the holes = the total volume of the powder and particles fed in = the volume of the added riveting.

8. The metallurgical and mechanical connection device of feeding stir friction riveting according to claim 1 is characterized in that: The hardness of the wire material is higher than that of the top plate, and the powder is a metal material or a non-metal material.

9. The metallurgical and mechanical connection device of feeding stir friction riveting according to claim 8, characterized in that: The metal materials include scandium, zirconium, niobium and titanium metal powders, and the non-metallic materials include carbon nanotubes, graphene nanosheets, and ceramic particles; the reinforced base powder accounts for less than 8% of the total feed volume, and the powder diameter is at or below the micron level.

10. A metallurgical and mechanical connection method by feeding stir friction riveting, using the metallurgical and mechanical connection device by feeding stir friction riveting as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Prefabricate holes on the top plate, wherein the volume of the holes is equal to the total volume of the powder and wire fed into the top plate; The top plate and the bottom plate are penetrated by the rotating cutting sleeve, and the stirring needle is withdrawn or the cutting sleeve is withdrawn and the stirring needle is pushed down to realize the riveting operation of the predetermined depth; 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 using the variable thread of the cutting sleeve; During the feeding process, preheating, feeding, retraction and forming steps are performed to complete the riveting process, in which the total volume of wire feeding is matched with the volume of the hole; The ring rivet connection is realized by sleeve rivet connection or the center rivet connection is realized by needle rivet connection; The powder is transported to the inside of the clamping ring of the guillotine machine through a powder feeder, the powder is evenly distributed in the riveting area, and the metallurgical bonding of the powder and the wire is achieved through stirring friction during the forming stage.

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