A stirring friction tunnel forming and synchronous shaping device and method

Abstract

This invention relates to a device and method for simultaneous shaping and refining of friction stir tunnels, belonging to the field of machining technology. It addresses the problem that traditional friction stir tunnel forming techniques result in severely rough surfaces on the inner wall of the tunnel, increasing flow resistance of the cooling medium and leading to decreased heat dissipation efficiency of the water-cooled plate during application, severely affecting its normal use. The device includes a shoulder and a stirring pin, with the shoulder connected to the stirring pin. The stirring pin comprises a rod structure, an enlarged structure, and a milling cutter structure. The enlarged structure has a threadless structure and a threaded structure on its two sides, respectively. The threadless structure of the enlarged structure is connected to the rod structure, and the milling cutter structure is located on the side of the threadless structure. The diameter of the rod structure is smaller than the diameter of the enlarged structure. The milling cutter structure on the upper part of the stirring pin of this invention mills the inner wall surface of the formed tunnel simultaneously with tunnel forming, improving its surface roughness and enhancing the heat dissipation efficiency of the water-cooled plate.

Description

Technical Field

[0001] This invention relates to a stirring friction tunnel forming device and method, belonging to the field of machining technology. Background Technology

[0002] Advances in science and technology and the rapid development of the aerospace field have placed higher demands on lightweight, highly integrated, and high heat flux density structures. The fabrication of compact, large-sized tunnels within structures offers excellent cooling medium transport capabilities, high heat dissipation efficiency, and strong heat conversion capacity, thus reducing structural weight and attracting widespread attention. Current tunnel fabrication technologies include embedded pipe fabrication, post-casting welding, post-machining welding, electron beam processing, and laser processing. However, these methods suffer from complex processing procedures, high costs, insufficient adaptability to compact and complex structures, difficulty in forming large-sized components, and the risk of corrosion from dissimilar materials.

[0003] Friction stir tunneling (FST) technology is based on the principle of friction stir welding. It utilizes the tunnel defects generated during the welding process to selectively extract material from the workpiece to the surface of a metal sheet, creating a continuous tunnel within. This technology exhibits unique advantages in achieving lightweight structures and rapid forming of internal cooling channels. Traditional FST technology results in severely rough inner surfaces of the tunnel walls, increasing flow resistance of the cooling medium and leading to decreased heat dissipation efficiency of water-cooled plates during application, significantly impacting their normal use.

[0004] Therefore, there is an urgent need to propose a stirring friction tunnel forming synchronous shaping device and method to solve the above-mentioned technical problems. Summary of the Invention

[0005] To overcome the aforementioned technical deficiencies, the present invention aims to provide a synchronous shaping device and method for friction stirring tunnel forming. A brief overview of the invention is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0006] The technical solution of this invention:

[0007] A friction stirring tunnel forming and synchronous shaping device includes a shoulder and a stirring pin. The shoulder is connected to the stirring pin. The stirring pin includes a rod structure, an enlarged structure and a milling cutter structure. The two sides of the enlarged structure are a non-threaded structure and a threaded structure, respectively. The non-threaded structure of the enlarged structure is connected to the rod structure. The side of the non-threaded structure is provided with a milling cutter structure. The diameter of the rod structure is smaller than the diameter of the enlarged structure.

[0008] Preferably, one end of the milling cutter structure is connected to the unthreaded structure, and the other end of the milling cutter structure is higher than the unthreaded structure.

[0009] Preferably, the number of milling cutter structures is 3-9, and the milling cutter structures are arranged in a circular array.

[0010] Preferably, the stirring needle also includes a screw, which is a countersunk screw. The upper side of the unthreaded structure is machined with a groove, and a milling cutter structure is correspondingly provided in each groove. The screw passes through the milling cutter structure and connects with the unthreaded structure.

[0011] Preferably, the rod structure is detachably connected to the shoulder, and the side of the rod structure has a milled surface.

[0012] Preferably, a stirring friction tunnel forming synchronous shaping device further includes a clamping body and a cylinder, wherein the clamping body, the cylinder, and the frustum-shaped shoulder are sequentially and coaxially connected, and the clamping body is connected to the main rotor.

[0013] Preferably, the diameter of the enlarged structure is 6-20mm, and the diameter of the rod structure is 4-15mm;

[0014] The height of the unthreaded structure shall not exceed one-third of the height of the expanded structure;

[0015] The vertical distance between the other end of the milling cutter structure and the end face of the unthreaded structure is 0.1-1mm;

[0016] The milling depth is 0.1-1mm, and there are three milling planes, which are equidistant from each other in the circumference.

[0017] A method for simultaneous shaping and modification of a stirring friction tunnel includes the following steps:

[0018] Step 1: Fix the plate and securely connect the shaping device to the spindle;

[0019] Step 2: Set the initial position, sinking speed, rotation speed, travel speed, and ending position of the stirring needle. The stirring needle of the shaping device will start running according to the settings.

[0020] Step 3: As the shaping device moves forward, the threaded structure draws the material (the thermoplasticized material on the sheet) upward and accumulates it to the top of the sheet. At the same time, a continuous tunnel is formed inside the sheet along the direction of the stirring needle. The milling cutter structure mills the upper surface of the inner wall of the tunnel.

[0021] Step 4: After the tunnel is processed, the sheet metal is cooled.

[0022] Preferably, the material of the friction stirring tunnel forming synchronous shaping device is tool steel or cemented carbide, and the plate is a metal plate.

[0023] Preferably, in step 1, the axis of the stirring needle has an inclination angle of 0-4° with the normal to the surface of the plate;

[0024] In step 2, the sinking speed of the stirring needle is 0.1-50 mm / min, and the sinking position should ensure that there is a gap of 0.1-3.0 mm between the shoulder and the surface of the plate. The rotation speed is 100-2000 rpm, and the travel speed is 10-500 mm / min.

[0025] In step 3, the threaded structure surface has a right-hand thread with a pitch of 1.0-3.0 mm, a height exceeding two-thirds of the enlarged structure, and a thread depth of 0.5-2.0 mm.

[0026] The present invention has the following beneficial effects:

[0027] 1. This invention can complete the integral forming of the internal cooling tunnel of the metal sheet in a single process, which greatly simplifies the process flow, improves the adaptability to complex structures, greatly improves production efficiency and reduces production costs.

[0028] 2. The threaded structure of the stirring pin of the present invention allows the material inside the metal sheet to flow upward to form a tunnel inside the sheet. The threadless structure and thin rod structure of the stirring pin alleviate the vertical flow of the material. At the same time, the milled plane of the thin rod structure promotes the horizontal flow of the material above the tunnel, thereby ensuring the surface forming quality and the regularity of the tunnel shape. This solves the problem of surface defects caused by the excessive diameter of the stirring pin in the traditional stirring friction tunnel forming method, thereby improving the surface forming quality.

[0029] 3. The milling cutter structure on the upper part of the stirring pin of the present invention performs milling processing on the upper surface of the inner wall of the formed tunnel while the tunnel is being formed, thereby improving its surface roughness and increasing the heat dissipation efficiency of the water-cooled plate.

[0030] 4. The shoulder and stirring pin of the present invention are connected separately, and the length of the stirring pin is adjustable, so that the method can adapt to metal plates of different thicknesses and can prepare tunnels at different depths inside the plate, which is highly adaptable and feasible. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a synchronous shaping device for friction stirring tunnel forming;

[0032] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0033] Figure 3 It is a schematic diagram of material flow and milling process during machining.

[0034] In the figure, 1-clamping body, 2-cylinder, 3-shoulder, 4-stirring needle; 5-rod structure; 6-expansion structure; 7-milling cutter structure; 8-groove, 9-screw, 10-tunnel, 11-upper surface of tunnel inner wall, 12-plate, 5-1-milled plane, 6-1-unthreaded structure, 6-2-threaded structure. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0036] Specific implementation method one: Combining Figure 1-3 This embodiment describes a friction stir tunnel forming and synchronous shaping device, comprising a shoulder 3 and a stirring pin 4. The shoulder 3 is connected to the stirring pin 4, which is an end-expanded stirring pin. The stirring pin 4 includes a rod structure 5, an expansion structure 6, and a milling cutter structure 7. The expansion structure 6 has a non-threaded structure 6-1 and a threaded structure 6-2 on its two sides, respectively. The non-threaded structure 6-1 of the expansion structure 6 is coaxially fixedly connected to the rod structure 5. The milling cutter structure 7 is provided on the side of the non-threaded structure 6-1. The rod structure 5 is a thin rod structure, and the diameter of the rod structure 5 is smaller than the diameter of the expansion structure 6. The threaded structure 6-1 of the end-expanded stirring pin causes the material inside the metal sheet to flow upward to achieve tunnel formation inside the sheet. The non-threaded structure and the thin rod structure of the end-expanded stirring pin alleviate the vertical flow of the material.

[0037] Specific Implementation Method Two: Combining Figure 1-3 This embodiment describes a stirring friction tunnel forming synchronous shaping device. One end of the milling cutter structure 7 is connected to the unthreaded structure 6-1, and the other end of the milling cutter structure 7 is higher than the unthreaded structure 6-1. The milling cutter structure at the end of the expanded stirring pin mills the upper surface of the formed tunnel inner wall while the tunnel is forming, improving its surface roughness and increasing the heat dissipation efficiency of the water-cooled plate.

[0038] Specific implementation method three: Combining Figure 1-3 This embodiment describes a stirring friction tunnel forming synchronous shaping device, wherein the number of milling cutter structures 7 is 3-9, and the milling cutter structures 7 are arranged in a circular array.

[0039] Specific implementation method four: Combination Figure 1-3This embodiment describes a stirring friction tunnel forming synchronous shaping device. The stirring pin 4 also includes a screw 9, which is a countersunk screw. The upper side of the cylindrical unthreaded structure 6-1 is machined with a groove 8, and a threaded hole is machined in the groove. A milling cutter structure 7 is correspondingly arranged in each groove. The screw 9 passes through the milling cutter structure 7 and connects and fixes to the threaded hole of the unthreaded structure 6-1, fixing the milling cutter structure 7 and making the surface transition smooth. This not only improves its own strength but also improves the installation and processing accuracy.

[0040] Specific Implementation Method Five: Combining Figure 1-3 This embodiment describes a synchronous shaping device for friction stir tunnel forming. The rod structure 5 is detachably connected to the shoulder 3. The rod structure 5 has three milled planes 5-1 on its side, evenly distributed around its circumference. The milled planes of the thin rod structure promote horizontal material flow above the tunnel, thus ensuring surface forming quality and tunnel shape regularity. This solves the problem of surface defects caused by excessively large stirring pin diameter in traditional friction stir tunnel forming methods, thereby improving surface forming quality. The threaded structure 6-2 draws material upwards from inside the plate 12. After passing through the threadless structure 6-1 and the thin rod structure 5, the vertical material flow is mitigated, preventing excessively vigorous material flow from reducing tunnel regularity. The milled plane 5-1 of the thin rod structure 5 enhances the horizontal material flow, thereby improving the density of the area above the tunnel. The lower part of the shoulder 3 is machined with an axial mounting hole, and the side of the shoulder 3 is machined with a threaded through hole. The radial threaded through hole communicates with the mounting hole, and a tightening bolt is installed in the threaded through hole. The height of the milled plane matches the length of the rod structure 5, and the milling depth is 0.1-1mm. The mounting hole is machined according to the shape of the rod structure 5. The rod structure 5 is inserted into the mounting hole, and after adjusting the appropriate length, the tightening bolt is rotated to tighten the rod structure 5. The shoulder 3 and the stirring needle 4 are connected separately, so that the length of the rod structure 5 is adjustable, which can adapt to different thicknesses of plate 12 and can prepare tunnels at different depths inside the plate, with strong adaptability and feasibility.

[0041] Specific Implementation Method Six: Combination Figure 1-3 This embodiment describes a synchronous shaping device for friction stir tunneling. The device further includes a clamping body 1 and a cylinder 2. The clamping body 1, cylinder 2, and frustum-shaped shoulder 3 are sequentially and coaxially connected. The clamping body 1 is connected to the main rotor of a friction stir welding machine, CNC milling machine, CNC machining center, etc. When the clamping body 1 rotates counterclockwise, the thread of the thread structure 6-2 should be a left-hand thread; when the clamping body 1 rotates clockwise, the thread of the thread structure 6-2 should be a right-hand thread.

[0042] Specific implementation method seven: Combining Figure 1-3This embodiment describes a stirring friction tunnel forming synchronous shaping device, wherein the diameter of the expansion structure 6 is 6-20mm and the diameter of the rod structure 5 is 4-15mm.

[0043] The height of the threadless structure 6-1 shall not exceed one-third of the height of the expanded structure 6, in order to ensure the ability of the material to flow upward;

[0044] The vertical distance between the other end of the milling cutter structure 7 and the end face of the unthreaded structure 6-1 is 0.1-1mm;

[0045] The radial depth of the milled plane 5-1 is 0.1-1mm. The bottom of the axial milled plane 5-1 is in contact with the upper part of the thread structure 6-2. There are three milled planes 5-1, which are equidistant from each other in the circumference.

[0046] Specific implementation method eight: Combination Figure 1-3 This embodiment describes a method for simultaneous shaping and reshaping of a friction stir tunnel, employing a friction stir tunnel forming and simultaneous shaping device (hereinafter referred to as the shaping device), and includes the following steps:

[0047] Step 1: Fix the plate 12 with tooling fixtures and fix the shaping device to the spindle of the machining equipment so that the shaping device is set to correspond to the surface of the plate 12 to be processed.

[0048] Step 2: Set the initial position, sinking speed, rotation speed, travel speed, and ending position of the stirring pin 4 using the machining equipment, start the machining equipment, and the stirring pin 4 of the shaping device will start running according to the set data;

[0049] Step 3: When the shaping device moves forward, the material (the material that has been cut and thermoplasticized on the plate) is drawn upward and piled up to the top of the plate 12 by the threaded structure 6-2. At the same time, a continuous tunnel 10 is formed inside the plate along the direction of travel of the stirring needle 4. The milling cutter structure 7 mills the upper surface 11 of the inner wall of the tunnel. The metal chips produced are left in the tunnel 10 and can be easily cleaned by using a device such as an air gun. This solves the problem of high roughness of the upper surface of the inner wall of the tunnel caused by lack of support force in the traditional stirring friction tunnel forming process, reduces the flow resistance of the cooling medium during application, and improves the heat dissipation efficiency.

[0050] Step 4: Stop the machining equipment. After the tunnel is processed, place the plate 12 in the air to cool to room temperature. This invention can complete the integral forming of the internal cooling tunnel of the metal plate in a single process, which greatly simplifies the process flow, improves the adaptability to complex structures, greatly improves production efficiency and reduces production costs.

[0051] Specific Implementation Method Nine: Combining Figure 1-3This embodiment describes a method for synchronous shaping of friction stir tunnels. The materials of the shoulder 3 and stirring pin 4 in the synchronous shaping of friction stir tunnels are tool steel or hard alloy, and the plate 12 is a metal plate. The hardness of the shoulder 3 and stirring pin 4 is higher than that of the plate 12.

[0052] Specific Implementation Method Ten: Combining Figure 1-3 This embodiment describes a method for synchronous shaping of a friction stir tunnel. In step 1, the axis of the stirring needle 4 has an angle of 0-4° with the normal to the surface of the plate 12.

[0053] In step 2, the sinking speed of the stirring needle 4 is 0.1-50 mm / min. The sinking position should ensure that there is a gap of 0.1-3.0 mm between the shoulder and the surface of the plate. The gap between the shoulder and the surface of the plate is sufficient to accommodate material overflow and thus ensure the tunnel size. Finally, a continuous tunnel with a regular shape and excellent inner and outer surface quality is processed inside the metal plate. The rotation speed is 100-2000 rpm and the travel speed is 10-500 mm / min.

[0054] In step 3, the surface of the threaded structure 6-2 has a right-hand thread with a pitch of 1.0-3.0 mm, a height exceeding two-thirds of the enlarged structure 6, and a thread depth of 0.5-2.0 mm.

[0055] Example 1:

[0056] The steps of a method for a simultaneous shaping and reshaping device for friction stirring tunnel formation are as follows:

[0057] ① Use tooling fixtures to fix the metal sheet, and fix the friction stirring tunnel forming synchronous shaping device to the spindle of the machining equipment, such as... Figure 1 As shown, the friction stir tunnel forming synchronous shaping device includes a clamping body 1, a cylinder 2, a shoulder 3, and a stirring pin 4. The axis of the stirring pin 4 has an inclination angle of 0-4° with the normal to the surface of the metal plate 12. Figure 2As shown, the stirring needle 4 consists of a rod structure 5, an expanding structure 6, and a milling cutter structure 7. The diameter of the expanding structure 4 is 6-20 mm, and the diameter of the thin rod structure 5 is 4-15 mm. The diameter of the expanding structure 4 should be larger than the diameter of the thin rod structure 5. The rod structure 5 has three milling planes, which are three milling planes 5-1 evenly distributed on the circumference. The height of the three milling planes matches the length of the rod structure 5, and their depth is 0.1-1 mm. The expanding structure 6 is divided into a non-threaded structure 6-1 and a threaded structure 6-2. The height of the non-threaded structure does not exceed one-third of the height of the expanding structure to ensure the upward flow of material. The upper surface of the threadless structure 6-2 is evenly distributed with at least three grooves 8 and matching milling cutter structures 7 and countersunk screws 9. The number of milling cutter structures 7 is 3-9, and the height of the milling cutter structure 7 above the expansion structure 6 is 0.1-1mm. The material of the stirring friction tunnel forming synchronous shaping device is tool steel or hard alloy, and its hardness should be higher than that of the metal plate 12. The shoulder 3 and the end expansion stirring needle 4 are connected separately, so that the length of the thin rod structure 5 can be adjusted, which can adapt to metal plates 12 of different thicknesses and can prepare tunnels at different depths inside the plate, with strong adaptability and feasibility.

[0058] ② Set the initial position, sinking speed, rotation speed, travel speed, and termination position of the stirring pin 4; the sinking speed of the stirring pin 4 is 0.1-50mm / min, the sinking position should ensure that there is a gap of 0.1-3.0mm between the shoulder and the surface of the metal plate, the rotation speed is 100-2000rpm, and the travel speed is 10-500mm / min.

[0059] Start the machining equipment so that the end expansion stirring needle 4 moves according to the data set in step three;

[0060] ③ The surface portion of the end-expanding stirring pin 4 is provided with a threaded structure 6-2. During the movement of the end-expanding stirring pin 4, material is drawn upwards and accumulated to the top of the metal plate, simultaneously forming a continuous tunnel inside the plate along the direction of travel of the end-expanding stirring pin 4. The threaded structure 6-2 is a right-hand thread with a pitch of 1.0-3.0 mm, a height exceeding two-thirds of the expansion structure 6, and a thread depth of 0.5-2.0 mm; Figure 3As shown, the threaded structure 6-2 draws the material inside the metal sheet 12 upwards. After passing through the threadless structure 6-1 and the thin rod structure 5, the vertical material flow is alleviated, avoiding excessive material flow that reduces the regularity of the tunnel. The three milling planes provided by the thin rod structure 5 enhance the horizontal material flow, thereby improving the density of the area above the tunnel. The milling cutter structure 7 mills the upper surface of the tunnel inner wall, and the generated metal chips remain in the tunnel. They can be easily cleaned using devices such as air guns. This solves the problem of high roughness of the upper surface of the tunnel inner wall caused by lack of support force in the traditional friction mixing tunnel forming process, reduces the flow resistance of the cooling medium during application, and improves heat dissipation efficiency.

[0061] ④ Stop the machining equipment and let the metal sheet cool to room temperature in the air.

[0062] This embodiment utilizes the threaded structure of the end-expanding stirring pin of the friction stirring tunnel forming synchronous shaping device to cause the material inside the metal sheet to flow upward, thereby forming a tunnel inside the metal sheet. The unthreaded structure above the end-expanding stirring pin and the thin rod structure above it alleviate the vertical flow of the material, while the three milling planes of the thin rod structure promote the horizontal flow of the material above the tunnel, thus ensuring the surface forming quality and the regularity of the tunnel shape. The milling cutter structure above the end-expanding stirring pin is used to mill the upper surface of the formed tunnel inner wall while the tunnel is forming, improving its surface roughness. The shoulder has a certain gap with the surface of the sheet to accommodate material overflow, thereby ensuring the tunnel size. Finally, a continuous tunnel with a regular shape and excellent inner and outer surface quality is formed inside the metal sheet.

[0063] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be permuted and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutation and combination. Therefore, this invention will not describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by this invention.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stirring friction tunnel forming and synchronous shaping device, characterized in that: It includes a shoulder (3) and a stirring needle (4). The shoulder (3) is connected to the stirring needle (4). The stirring needle (4) includes a rod structure (5), an enlarged structure (6) and a milling cutter structure (7). The two sides of the enlarged structure (6) are a non-threaded structure (6-1) and a threaded structure (6-2). The non-threaded structure (6-1) of the enlarged structure (6) is connected to the rod structure (5). The side of the non-threaded structure (6-1) is provided with a milling cutter structure (7). The diameter of the rod structure (5) is smaller than the diameter of the enlarged structure (6). One end of the milling cutter structure (7) is connected to the unthreaded structure (6-1), and the other end of the milling cutter structure (7) is higher than the unthreaded structure (6-1).

2. The synchronous shaping device for friction stirring tunnel forming according to claim 1, characterized in that: The number of the milling cutter structures (7) is 3-9, and the milling cutter structures (7) are arranged in a circular array.

3. The synchronous shaping device for friction stirring tunnel forming according to claim 2, characterized in that: The stirring needle (4) also includes a screw (9), which is a countersunk screw. The upper side of the unthreaded structure (6-1) is machined with a groove (8), and a milling cutter structure (7) is provided in each groove. The screw (9) passes through the milling cutter structure (7) and connects to the unthreaded structure (6-1).

4. The synchronous shaping device for friction stirring tunnel forming according to claim 3, characterized in that: The rod structure (5) is detachably connected to the shoulder (3), and the side of the rod structure (5) has a milled surface (5-1).

5. A stirring friction tunnel forming and synchronous shaping device according to claim 1 or 4, characterized in that: A stirring friction tunnel forming synchronous shaping device further includes a clamping body (1) and a cylinder (2), wherein the clamping body (1), the cylinder (2), and the frustum-shaped shoulder (3) are sequentially coaxially connected, and the clamping body (1) is connected to the main rotor.

6. The synchronous shaping device for friction stirring tunnel forming according to claim 5, characterized in that: The diameter of the enlarged structure (6) is 6-20 mm, and the diameter of the rod structure (5) is 4-15 mm; The height of the threadless structure (6-1) shall not exceed one-third of the height of the expanded structure (6); The vertical distance between the other end of the milling cutter structure (7) and the end face of the unthreaded structure (6-1) is 0.1-1mm; The depth of the milled plane (5-1) is 0.1-1mm, and there are three milled planes (5-1) arranged equidistantly in the circumference.

7. A method for simultaneous shaping and modification of a stirring friction tunnel, characterized in that: The simultaneous shaping and reshaping device for friction stirring tunneling according to any one of claims 1-6 includes the following steps: Step 1: Fix the plate (12) and fix the shaping device to the spindle; Step 2: Set the initial position, sinking speed, rotation speed, travel speed and termination position of the stirring needle (4), and the stirring needle (4) of the shaping device will start running according to the settings; Step 3: When the shaping device moves, the threaded structure (6-2) draws the thermoplasticized material on the plate upward and accumulates it to the top of the plate (12). At the same time, a continuous tunnel (10) is formed inside the plate along the direction of travel of the stirring needle (4). The milling cutter structure (7) mills the upper surface (11) of the inner wall of the tunnel. Step 4: After the tunnel is processed, the plate (12) is cooled.

8. The method for simultaneous shaping and modification of a friction-stirring tunnel according to claim 7, characterized in that: The material of a stirring friction tunnel forming synchronous shaping device is tool steel or hard alloy, and the plate (12) is a metal plate.

9. The method for simultaneous shaping and modification of a friction-stirring tunnel according to claim 8, characterized in that: In step 1, the axis of the stirring needle (4) has an inclination angle of 0-4° with the normal to the surface of the plate (12); In step 2, the sinking speed of the stirring needle (4) is 0.1-50 mm / min, the sinking position should ensure that the shoulder of the shaft and the surface of the plate have a gap of 0.1-3.0 mm, the rotation speed is 100-2000 rpm, and the travel speed is 10-500 mm / min; In step 3, the surface of the threaded structure (6-2) has a right-hand thread with a pitch of 1.0-3.0 mm, a height that exceeds two-thirds of the enlarged structure (6), and a thread depth of 0.5-2.0 mm.

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