Friction stir additive manufacturing system with heat treatment function

Abstract

The invention relates to a friction stir additive manufacturing system with a heat treatment function, which is characterized in that by adopting integrated arrangement of a friction stir additive device and a heat treatment device, additive and heat treatment can be carried out synergistically, and heat treatment operation can be carried out on an additive part after the additive is completed; in addition, the heat treatment process and the cooling process are used in cooperation, and the heat input amount in the material adding process can be accurately controlled. Compared with the prior art, the problems that the plastic flow of the deposition material in the material adding process is not uniform, and the temperature in the material adding process is difficult to accurately control are solved, the material adding temperature can be accurately regulated and controlled, the mechanical property and the material adding efficiency of the material adding part can be greatly improved, and the material adding method has wide application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of friction stir deposition additive manufacturing, and in particular to a friction stir additive manufacturing system with a heat treatment function. Background Art

[0002] As a new type of solid-phase additive manufacturing method, the friction stir deposition additive technology generally places the deposited material in a hollow additive tool, generates heat through the friction between the high-speed rotating stirring tool and the material, thermally plasticizes the material, and plastically deforms the material through the top extrusion force and friction force; the stirring tool drives the material to move along a preset trajectory to achieve material accumulation, and through the continuous upward movement of the tool, layer-by-layer additive manufacturing is achieved. Because the temperature during the friction stir deposition additive process is lower than the melting point of the additive material, it avoids defects such as pores and cracks related to melting and solidification, and has attracted widespread attention.

[0003] However, the existing friction stir deposition additive technology still faces many challenges in practical applications. First, the plastic flow of the material during the additive process is uneven, which makes it difficult to control the quality of the additive. For example, Chinese patent CN116944661A discloses a friction stir additive manufacturing device based on ultrasonic vibration assistance, which performs ultrasonic vibration-assisted additive in the X and Y directions, hoping to promote the plastic flow and deformation of the material. However, since the device does not increase the total amount of heat input during the additive process, it fails to improve the additive quality. Although Chinese patent CN115958283A improves heat input through a double-stirring head friction stir additive manufacturing device with auxiliary cooling, its structure is complex and the manufacturing cost is high, which is not conducive to actual mass production.

[0004] In addition, the existing additive device materials are generally powder, filament and rod materials. These materials have problems such as difficulty in controlling the deposition direction, uneven heating or difficulty in continuous feeding during the additive process. At the same time, the existing technology is difficult to accurately control the temperature during the deposition process, and as the deposition layer continues to increase, the temperature continues to rise, resulting in defects such as peeling on the surface of the deposition layer, affecting the mechanical properties of the deposition layer; different deposition layers are subjected to different thermal cycles and extrusion effects, which will also lead to large differences in mechanical properties between layers, limiting the molding quality and application range of stir friction deposition additives.

[0005] Therefore, there is an urgent need for a new type of stir friction additive manufacturing device to improve the main problems faced by existing additive technology, so as to produce parts with better mechanical properties and more complex structures to meet the needs of high-performance materials and components in the fields of aerospace, transportation, etc. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a stir friction additive manufacturing system with heat treatment function to achieve precise control of the temperature during the additive process, thereby improving the additive quality.

[0007] During the course of conception, the applicant believed that the present invention adopts an integrated arrangement of a stir friction additive device and a heat treatment device. Through the coordinated use of a heat treatment process and a cooling process, the heat input amount in the additive process can be accurately controlled, thereby improving the additive efficiency and the mechanical properties of the additive parts.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] The present invention provides a friction stir additive manufacturing system with a heat treatment function, which mainly includes a friction stir additive device and a heat treatment device;

[0010] The friction stir material adding device comprises a hydraulic cylinder, a hydraulic rod, a stirring tool, and a base plate. The hydraulic rod is arranged at the lower opening of the hydraulic cylinder, the lower end of the hydraulic rod is connected to the stirring tool, and the base plate is arranged below the stirring tool.

[0011] The heat treatment device is arranged below the friction stir material adding device, and the heat treatment device comprises a heat preservation box and a temperature measuring device, a heating device and a lifting device arranged in the heat preservation box;

[0012] The temperature measuring device is used to measure the temperature in the insulation box, the heating device is used to adjust the temperature in the insulation box, and the lifting device is used to adjust the height of the substrate, so as to preheat or cool the substrate or the insulation deposition part to achieve precise control of the height of the additive layer and improve the mechanical properties of the deposition part.

[0013] Furthermore, a square through hole is opened at the center of the stirring tool, and the central opening of the stirring tool is filled with deposition material, and the hydraulic cylinder drives the hydraulic rod to press down to realize the transportation of the deposition material.

[0014] Preferably, the deposition material is a square rod, and the square rod is made of any one of 2219 aluminum alloy, 2195 aluminum alloy, and aluminum-based silicon carbide.

[0015] Furthermore, the heat preservation box is arranged directly below the base plate, and the heat preservation box is composed of a heat preservation box cover and a heat preservation box body. The heat preservation box cover is arranged above the heat preservation box body and can be moved left and right to facilitate the opening and closing of the heat preservation box.

[0016] The bottom of the insulation box is provided with a base support plate, a through hole and a piston. The base support plate can be freely extended and retracted and is evenly arranged at the bottom of the insulation box. The diameter of the through hole matches the outer diameter of the piston. The through hole is used to inject or discharge coolant into the insulation box. When in working state, the piston is used to keep the insulation box closed.

[0017] Preferably, the thermal insulation box body is made of thermal insulation materials with excellent performance, such as aluminum silicate, rock wool, aerogel or nano thermal insulation board.

[0018] Furthermore, the temperature measuring device includes a temperature sensor and a temperature display integrated therewith, and the temperature sensor can capture and measure the temperature inside the thermal insulation box and transmit the electrical signal to the temperature display arranged on the outer wall of the thermal insulation box.

[0019] Furthermore, the heating device includes a plurality of electric heating rods, which are symmetrically inserted on both sides of the heat preservation box and generate heat by energizing with resistance wires.

[0020] Furthermore, the lifting device is composed of a plurality of freely retractable base support plates, and the base support plates drive the base plate to fall into or extend out of the heat preservation box through hydraulic action.

[0021] Preferably, a groove is provided at the bottom of the substrate, and the shape and size of the groove can accurately match the flange at the top of the base support plate to limit the movement of the substrate in the X-axis and Y-axis directions. The limitation in the Z-axis direction is achieved by the gravity of the substrate itself, which facilitates the replacement of the substrate.

[0022] Furthermore, the temperature inside the heat preservation box is controlled by adjusting the number and medium of the electric heating rods and injecting or discharging cooling liquid into the heat preservation box.

[0023] Preferably, the number of the electric heating rods is 2 to 6.

[0024] Preferably, the medium of the electric heating rod is a metal material such as iron-aluminum alloy, nickel-chromium alloy or a non-metallic material such as silicon carbide and molybdenum disilicide.

[0025] Preferably, the temperature of the heating device is 150-600°C.

[0026] Before adding materials, the substrate is dropped into the heat preservation box through the lifting device to be preheated to the target temperature, so as to reduce the heat input required in the process of adding materials, facilitate the plasticization and flow of materials during adding materials, and improve the efficiency and quality of adding materials;

[0027] After the additive manufacturing is completed, the substrate is subjected to heat treatment. First, the inside of the insulation box is heated to the set temperature, and then the deposited parts placed on the substrate are dropped into the insulation box for insulation through the lifting device, so that the precipitated phase inside the deposited layer after additive manufacturing is quickly dissolved, and the residual stress inside the deposited layer is reduced, and the second phase particles inside the deposited parts are evenly distributed, so as to achieve the purpose of improving the strength and toughness of the deposited layer.

[0028] Furthermore, the friction stir additive device also includes a motor, a transmission box cover, a transmission box, and a box end cover;

[0029] The motor is arranged above the transmission box cover, and the transmission box is arranged below the motor. A motor shaft and a transmission belt are arranged in the transmission box. The motor drives the stirring tool to rotate on a fixed axis through the motor shaft and the transmission belt, thereby ensuring smooth power transmission, improving transmission efficiency, and being applicable to a variety of complex working conditions.

[0030] Preferably, the rotation speed of the stirring tool is 300-500 r / min.

[0031] Furthermore, a general support body is installed at the rear side of the friction stir additive device, and the general support body is used to support and move the friction stir additive device, so that the position between the additive device and the heat treatment device is more flexible.

[0032] Furthermore, the general support body is provided with a first groove and a second groove, the first groove is slidably connected to one end of the hydraulic cylinder support frame, and the other end of the hydraulic cylinder support frame is fixedly connected to the hydraulic cylinder; the second groove is slidably connected to one end of the additive device support frame, and the other end of the additive device support frame is fixedly connected to the transmission box; the stir friction additive device can be moved up and down, and the distance between the stirring tool and the substrate can be adjusted, so that the additive layer height in the additive process can be controlled, and multi-layer additive can be achieved, and the height of each additive layer can be ensured to be consistent.

[0033] Furthermore, the friction stir additive device also includes a stirring tool clamp and a bearing, both of which are connected to the stirring tool, the stirring tool clamp is used to fix the stirring tool, and the bearing is used to reduce the rotational friction between the stirring tool clamp and the stirring tool.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) The present invention adopts an integrated arrangement of a friction stir additive device and a heat treatment device, which can not only realize the coordinated addition and heat treatment, but also perform heat treatment operations on the additive parts after the addition is completed. The present invention uses a heat treatment device to preheat the substrate before the addition, adjusts the temperature of the substrate before the addition starts, reduces the amount of heat input required during the addition process, and improves the efficiency of the addition; uses a lifting device to place the substrate after the addition into an insulation box for heat treatment, changes the microstructure and grain size inside the additive layer, and improves the mechanical properties of the additive parts.

[0036] (2) The heat treatment device provided by the present invention uses heat-insulating materials to reduce heat exchange between the inside and outside of the box and reduce heat loss. It also uses electric heating rods to quickly reach the temperature required for heat treatment. Various cooling media can be added to the inside of the heat-insulating box to cool the substrate during or after the additive process, thereby achieving rapid cooling of the additive parts, avoiding various defects caused by excessive heat input, and improving the yield rate of the additive parts. By changing the medium of the coolant and the medium and power of the electric heating rod, the cooling type and heating temperature can be adjusted, and a variety of different heat treatment processes can be performed, expanding the process range of the device.

[0037] (3) The present invention uses a hydraulic device to stably provide the upsetting force required for additive manufacturing. Through the extrusion of the hydraulic rod and the rotation of the stirring tool, the additive material is input at a constant feed speed under the combined effect of centrifugal force and upsetting force, thereby avoiding the problem of material jamming caused by the non-smooth feeding of the additive material. In addition, the length of the required rod can be calculated using the law of conservation of volume and the length of the predetermined trajectory, and the length of the added deposition material can be adjusted by adjusting the distance between the hydraulic cylinder and the stirring tool, thereby improving the utilization rate of the deposition material and the efficiency of additive manufacturing. The rotation of the stirring tool can promote plastic deformation and dynamic recrystallization of the deposition material, thereby promoting fine grain strengthening of the deposition material, reducing internal defects, and improving the mechanical properties of the additive part.

[0038] (4) The present invention can simultaneously adjust the lifting of the stirring tool and the lifting of the substrate, thereby adjusting the distance between the two, that is, the height of the additive layer, to achieve precise control of the height of the additive layer, thereby reducing the height error in the additive process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a front view of the friction stir additive manufacturing system with heat treatment function in Example 1 of the present invention;

[0040] Figure 2 A top view of a friction stir additive manufacturing system with a heat treatment function in Example 1 of the present invention;

[0041] Figure 3 This is an axonometric view of the friction stir additive device in Example 1 of the present invention;

[0042] Figure 4 This is an axonometric view of the heat treatment device in Example 1 of the present invention.

[0043] The names corresponding to the figure marks in the accompanying drawings are: 1-hydraulic cylinder; 2-hydraulic rod; 3-stirring tool; 4-deposition material; 5-substrate; 6-insulation box cover; 7-insulation box body; 8-temperature display; 9-electric heating rod; 10-general support body; 11-motor; 12-transmission box cover; 13-transmission box; 14-hydraulic cylinder support frame; 15-additive device support frame; 16-stirring tool clamp; 17-box end cover; 18-bearing; 19-transmission belt; 20-substrate support body; 21-piston; 22-temperature sensor. DETAILED DESCRIPTION

[0044] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0045] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0048] In the following implementation manners or examples, unless otherwise specified, the component models, material names, connection structures, layout forms and other features indicate that they are all conventional components or conventional structures used in the art to achieve corresponding functions.

[0049] Example 1

[0050] See also Figure 1-Figure 4 , taking the preparation of square bars from 2219-T8 aluminum alloy as an example, this embodiment provides a friction stir additive manufacturing system with a heat treatment function, which mainly includes a friction stir additive device and a heat treatment device;

[0051] The friction stir additive device comprises a hydraulic cylinder 1, a hydraulic rod 2, a stirring tool 3, and a base plate 5. The hydraulic rod 2 is provided at the lower end opening of the hydraulic cylinder 1. The stirring tool 3 is connected to the lower end of the hydraulic rod 2. The base plate 5 is provided below the stirring tool 3.

[0052] The heat treatment device is arranged below the friction stir material adding device, and the heat treatment device comprises a heat preservation box and a temperature measuring device, a heating device and a lifting device arranged in the heat preservation box;

[0053] The temperature measuring device is used to measure the temperature in the insulation box, the heating device is used to adjust the temperature in the insulation box, and the lifting device is used to adjust the height of the substrate 5, so as to preheat or cool the substrate 5 or the insulation deposition part to achieve precise control of the height of the additive layer and improve the mechanical properties of the deposition part.

[0054] In this embodiment, a square through hole is opened at the center of the stirring tool 3, and a square rod is installed at the central opening of the stirring tool 3. The hydraulic cylinder 1 drives the hydraulic rod 2 to press down to realize the transportation of the rod, and the feeding speed is 120mm / min.

[0055] Specifically, the heat preservation box is arranged directly below the base plate 5, and the heat preservation box is composed of a heat preservation box cover 6 and a heat preservation box body 7. The heat preservation box cover 6 is arranged above the heat preservation box body 7 and can be moved left and right to facilitate the opening and closing of the heat preservation box.

[0056] like Figure 4 As shown, a substrate support 20, a through hole and a piston 21 are provided at the bottom of the insulation box 7. The substrate support 20 is evenly arranged at the bottom of the insulation box 7. The diameter of the through hole matches the outer diameter of the piston 21. The through hole is used to inject or discharge coolant into the insulation box. When in working state, the piston 21 is used to keep the insulation box airtight.

[0057] In this embodiment, the heat-insulating box body 7 is made of aluminum silicate heat-insulating material.

[0058] Specifically, the temperature measuring device includes a temperature sensor 22 and a temperature display 8 integrated therewith. The temperature sensor 22 can capture and measure the temperature inside the thermal insulation box 7 and transmit the electrical signal to the temperature display 8 arranged on the outer wall of the thermal insulation box 7.

[0059] In this embodiment, the heating device includes four electric heating rods 9, which are symmetrically inserted on both sides of the heat preservation box 7. The medium of the electric heating rods 9 is an iron-aluminum alloy, and the temperature of the heating device is 150-600°C.

[0060] In this embodiment, the lifting device is composed of four substrate supports 20 that can be freely extended and retracted. The substrate supports 20 drive the substrate 5 to fall into or extend out of the heat preservation box 7 through hydraulic action.

[0061] Specifically, a groove is provided at the bottom of the substrate 5, and the shape and size of the groove can accurately match the flange at the top of the base support plate to limit the movement of the substrate 5 in the X-axis and Y-axis directions. The limitation in the Z-axis direction is achieved by the gravity of the substrate 5 itself, and the replacement of the substrate 5 is convenient.

[0062] Specifically, the friction stir additive device also includes a motor 11, a transmission box cover 12, a transmission box 13, and a box end cover 17; the motor 11 is arranged above the transmission box cover 12, and the transmission box 13 is arranged below the motor 11. A motor shaft and a transmission belt 19 are arranged in the transmission box 13. The motor 11 drives the stirring tool 3 to rotate on a fixed axis through the motor shaft and the transmission belt 19. By changing a series of parameters of the transmission belt 19 and the rotation speed of the motor 11, the stepless speed regulation of the stirring tool 3 can be achieved.

[0063] In this embodiment, the rotation speed of the stirring tool 3 is 300 r / min.

[0064] In this embodiment, a general support body 10 is installed at the rear side of the friction stir additive device, and the general support body 10 is used to support and move the friction stir additive device.

[0065] In this embodiment, a first groove and a second groove are provided on the main support body 10, the first groove is slidably connected to one end of the hydraulic cylinder support frame 14, and the other end of the hydraulic cylinder support frame 14 is fixedly connected to the hydraulic cylinder 1; the second groove is slidably connected to one end of the additive device support frame 15, and the other end of the additive device support frame 15 is fixedly connected to the transmission box 13.

[0066] The hydraulic cylinder support frame 14 and the additive device support frame 15 can drive the additive device to move up and down as a whole, adjust the distance between the additive device and the substrate 5, and realize stir friction additive manufacturing at different heights.

[0067] In this embodiment, the friction stir additive device also includes a stirring tool clamp 16 and a bearing 18, both of which are connected to the stirring tool 3, the stirring tool clamp 16 is used to fix the stirring tool 3, and the bearing 18 is used to reduce the rotational friction between the stirring tool clamp 16 and the stirring tool 3.

[0068] The working process of the system in this embodiment is as follows:

[0069] (1) Before additive manufacturing, the inner space of the insulated box is heated by the electric heating rod 9, and the temperature sensor 22 in the insulated box captures and measures the temperature inside the insulated box body 7 and transmits the electrical signal to the temperature display 8. After heating to 300°C, the temperature is maintained, and then the substrate 5 is placed in the insulated box for preheating for 2 hours.

[0070] (2) After the substrate 5 is preheated, the distance between the lower end surface of the stirring tool 3 and the surface of the substrate 5 is adjusted to 3 mm using the hydraulic rod 2 and the substrate support 20 .

[0071] (3) During additive manufacturing, the hydraulic cylinder 1 drives the hydraulic rod 2 to press down to realize the output of the rod material. The extruded rod material flows under the dual heat input of stirring friction and plastic deformation, and forms a joint with the surface of the substrate 5 in a state close to melting. The temperature of the additive process is about 80% of the melting point of the rod material, that is, 450°C. It forms an atomic bonding layer with the surface to be added in a non-melted state, thereby forming a joint. At the same time, the stirring tool 3 moves 200 mm along the X-axis direction to complete the single-layer additive manufacturing process. The stirring tool 3 can be adjusted up by 3 mm for each subsequent layer accumulation to ensure the consistency of the height of each additive layer.

[0072] (4) After the addition is completed, the substrate 5 is heat treated. First, the interior of the heat preservation box 7 is heated to 535°C, and then the substrate 5 and the deposited parts placed on the substrate 5 are dropped into the heat preservation box by the lifting device to dissolve the strengthening phase in the alloy and form a supersaturated solid solution. Then, the heat preservation is carried out for 2 hours to ensure that the matrix is ​​fully dissolved. Finally, the temperature in the heat preservation box is adjusted to 170°C, and the deposited parts are taken out after being kept warm for 24 hours.

[0073] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A friction stir additive manufacturing system with heat treatment function, characterized in that: It includes a friction stir additive device and a heat treatment device; The friction stir material adding device comprises a hydraulic cylinder (1), a hydraulic rod (2), a stirring tool (3), and a base plate (5); the hydraulic rod (2) is arranged at the lower end opening of the hydraulic cylinder (1); the stirring tool (3) is connected to the lower end of the hydraulic rod (2); and the base plate (5) is arranged below the stirring tool (3); The heat treatment device is arranged below the friction stir material adding device, and the heat treatment device comprises a heat preservation box and a temperature measuring device, a heating device and a lifting device arranged in the heat preservation box; The temperature measuring device is used to measure the temperature in the heat preservation box, the heating device is used to adjust the temperature in the heat preservation box, and the lifting device is used to adjust the height of the substrate (5), thereby preheating or cooling the substrate (5) or the heat preservation deposited part to achieve accurate control of the height of the additive layer and improve the mechanical properties of the deposited part.

2. A friction stir additive manufacturing system with heat treatment function according to claim 1, characterized in that: A square through hole is opened at the center of the stirring tool (3), and a deposition material (4) is installed at the center opening of the stirring tool (3). The hydraulic cylinder (1) drives the hydraulic rod (2) to press down to realize the transportation of the deposition material (4).

3. The friction stir additive manufacturing system with heat treatment function according to claim 1, characterized in that: The heat preservation box is arranged directly below the base plate (5), and the heat preservation box is composed of a heat preservation box cover (6) and a heat preservation box body (7), and the heat preservation box cover (6) is arranged above the heat preservation box body (7); The bottom of the thermal insulation box (7) is provided with a substrate support body (20), a through hole and a piston (21); the substrate support body (20) is evenly arranged at the bottom of the thermal insulation box (7); the diameter of the through hole matches the outer diameter of the piston (21); and the through hole is used to inject or discharge cooling liquid into the thermal insulation box.

4. A friction stir additive manufacturing system with heat treatment function according to claim 3, characterized in that: The temperature measuring device comprises a temperature sensor (22) and a temperature display (8) integrated therewith, wherein the temperature sensor (22) is capable of capturing and measuring the temperature inside the heat preservation box (7) and transmitting an electrical signal to the temperature display (8) arranged on the outer wall of the heat preservation box (7); The heating device comprises a plurality of electric heating rods (9), which are symmetrically inserted on both sides of the heat preservation box (7) and generate heat by energizing a resistance wire; The lifting device is composed of a plurality of freely retractable substrate support bodies (20), and the substrate support bodies (20) drive the substrate (5) to fall into or extend out of the heat preservation box (7) through hydraulic action.

5. The friction stir additive manufacturing system with heat treatment function according to claim 4, characterized in that: The temperature inside the heat preservation box (7) is controlled by adjusting the number and medium of the electric heating rods (9) and injecting or discharging cooling liquid into the heat preservation box.

6. The friction stir additive manufacturing system with heat treatment function according to claim 4, characterized in that: The temperature of the heating device is 150-600°C.

7. The friction stir additive manufacturing system with heat treatment function according to claim 1, characterized in that: The friction stir material adding device also includes a motor (11), a transmission box cover (12), a transmission box (13), and a box end cover (17); The motor (11) is arranged above the transmission box cover (12), and the transmission box (13) is arranged below the motor (11). A motor shaft and a transmission belt (19) are arranged in the transmission box (13). The motor (11) drives the stirring tool (3) to rotate on a fixed axis through the motor shaft and the transmission belt (19). The rotation speed of the stirring tool (3) is 300-500 r / min.

8. The friction stir additive manufacturing system with heat treatment function according to claim 1, characterized in that: A general support body (10) is installed on the rear side of the friction stir additive device, and the general support body (10) is used to support and move the friction stir additive device.

9. The friction stir additive manufacturing system with heat treatment function according to claim 8, characterized in that: The main support body (10) is provided with a first groove and a second groove, wherein the first groove is slidably connected to one end of a hydraulic cylinder support frame (14), and the other end of the hydraulic cylinder support frame (14) is fixedly connected to the hydraulic cylinder (1); the second groove is slidably connected to one end of an additive device support frame (15), and the other end of the additive device support frame (15) is fixedly connected to a transmission box (13).

10. The friction stir additive manufacturing system with heat treatment function according to claim 1, characterized in that: The friction stir additive device further comprises a stirring tool holder (16) and a bearing (18), wherein the stirring tool holder (16) and the bearing (18) are both connected to the stirring tool (3), the stirring tool holder (16) is used to fix the stirring tool (3), and the bearing (18) is used to reduce the rotational friction between the stirring tool holder (16) and the stirring tool (3).

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