A high-efficiency low-heat-loss friction stir welding additive equipment

Abstract

The present application relates to the field of solid phase additive manufacturing, in particular to a high-efficiency low-heat-loss friction stir welding additive manufacturing equipment, which comprises a support shell, the inner side of the support shell is fixedly connected with an arch body, two arch bodies are symmetrically fixedly arranged on the left and right sides inside the support shell, the inner sides of the two arch bodies are respectively rotationally connected with a driven wheel and a driving wheel, and the outer side of the arch body is fixedly connected with a feeding motor, the driving wheel, the driven wheel and the spiral transmission pipe are arranged, when the driving wheel is driven to rotate by the feeding motor, the driving wheel and the driven wheel jointly clamp and transport the additive part, the spiral transmission pipe is located on the outer side of the additive part and guides the transport path of the additive part, the transport process of the additive part can be constrained by the spiral transmission pipe, the additive part is prevented from being bent or deviated during the transport process, and the deposition position deviation problem caused by unstable transport of the additive part is solved.

Description

Technical Field

[0001] This invention relates to the field of solid-state additive manufacturing, and more particularly to a high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment. Background Technology

[0002] Friction stir welding (FSW) is a solid-state joining technology that achieves material bonding through frictional heat generation and plastic flow between the stirring head and the material. In recent years, additive manufacturing technologies based on the principle of friction stir (such as friction stir additive manufacturing, FSAM) have gradually developed, enabling the rapid prototyping of three-dimensional components by layering heat sources and materials.

[0003] Existing friction stir welding additive manufacturing equipment suffers from problems such as severe heat loss, low additive efficiency, and wide heat-affected zone. The heat generated by friction is easily lost through the stirring head handle, backing plate, and unprocessed areas, resulting in poor interlayer bonding. The single stirring head structure makes it difficult to balance forming quality and travel speed. Poor thermal circulation control can easily lead to coarsening of the microstructure. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment, comprising a supporting shell, with two connecting frames fixedly connected to the inner side of the supporting shell. The two connecting frames are symmetrically fixedly arranged on the left and right sides inside the supporting shell. A driven wheel and a driving wheel are rotatably connected to the inner sides of the two connecting frames, respectively. A feeding motor is fixedly connected to the outer side of the connecting frames, and the feeding motor is used to drive the driving wheel to rotate. An additive component is conveyed to the inner side of the driving wheel and the driven wheel. A supporting baffle is fixedly connected to the inner side of the supporting shell. The supporting baffle has an annular structure, and a spiral transmission tube with a spiral structure is fixedly connected to the bottom end of the supporting baffle. The spiral transmission tube is located outside the additive component.

[0006] Furthermore, a connecting pipe is fixedly connected to the outer side of the spiral transmission tube. There are two connecting pipes in total, which are symmetrically fixed on the left and right sides of the spiral transmission tube. The connecting pipes extend outward to support the housing.

[0007] Furthermore, a fixed base plate is fixedly connected to the top of the support housing, which is used to connect with the welding machine body. A docking mounting plate is also fixedly connected to the bottom of the support housing. Both the fixed base plate and the docking mounting plate have mounting holes inside.

[0008] Furthermore, a hollow motor is embedded inside the support housing, and a hollow rotor is rotatably connected inside the hollow motor. The hollow motor is used to drive the hollow rotor to rotate.

[0009] Furthermore: the bottom end of the hollow rotor is fixedly connected with a ring array of inserts, and the bottom end of the docking mounting plate is equipped with a mounting bracket. The mounting bracket also has four screw holes arranged in a ring array inside, and the screw holes are threaded with connecting bolts. The connecting bolts are used for threaded connection with the docking mounting plate.

[0010] Further: A groove is provided on the side of the mounting bracket near the docking mounting plate. This groove is an insertion groove. A friction welding seat is rotatably connected inside the insertion groove. The friction welding seat is rotatably set inside the mounting bracket through a bearing seat.

[0011] Furthermore, the top surface of the friction welding base is provided with a ring array of positioning holes, which are adapted to the insertion post fixedly set at the bottom end of the hollow rotor, and are used to complete the connection between the hollow rotor and the friction welding base by inserting the insertion post into the interior of the positioning hole.

[0012] Furthermore, a friction welding head is fixedly connected to the bottom end of the friction welding base. The friction welding head passes through the mounting bracket on the downward side. Both the friction welding base and the friction welding head have bidirectional channels running through both the upper and lower sides inside. These channels are used for the additive parts to pass through.

[0013] Furthermore, a sleeve module is installed at the bottom of the mounting support. The sleeve module has an internal hollow structure and contains a heat transfer medium. Six fixed end plates for connecting to the mounting support are fixedly connected in a ring array on the outer wall of the sleeve module.

[0014] Furthermore: a docking branch pipe is fixedly connected to the outside of the sleeve module, and a docking plug for connecting with the docking pipe is fixedly connected to the outside of the docking branch pipe. The sleeve module is cyclically connected to the spiral transmission pipe through the docking branch pipe, the docking pipe and the spiral transmission pipe.

[0015] The present invention has the following beneficial effects:

[0016] 1. Compared with existing technologies, this high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment, by setting up components such as a drive wheel, a driven wheel, and a spiral transfer tube, allows the drive wheel to rotate when the feeding motor drives it. The drive wheel and the driven wheel together clamp and transport the additive part. The spiral transfer tube is located outside the additive part and guides the transport path of the additive part. This device can constrain the transport process of the additive part through the spiral transfer tube, preventing the additive part from bending or deviating during transport, thereby solving the problem of deposition position deviation caused by unstable transport of the additive part.

[0017] 2. Compared with existing technologies, this high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment, through the setting of components such as a spiral transfer tube, a sleeve module, a connecting pipe, and a connecting branch pipe, etc., the sleeve module is filled with a heat transfer medium, and the sleeve module and the spiral transfer tube are connected in a circulating manner through the connecting branch pipe and the connecting pipe, and the heat transfer medium circulates between the sleeve module and the spiral transfer tube; this device enables the sleeve module to absorb the excess heat generated by the friction welding head and the deposition area, and then transfer the heat to the spiral transfer tube. The spiral transfer tube uses the recovered heat to preheat the additive part located inside it, thereby reducing the need for the friction welding head to generate all the heat by friction alone, reducing the heat loss to the support shell and the external environment, and solving the problems of serious heat loss and low thermal efficiency of existing equipment.

[0018] 3. Compared with existing technologies, this high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment, through the setting of components such as a hollow motor, a hollow rotor, a friction welding seat, and a friction welding head, etc., the hollow motor drives the hollow rotor to rotate, and the hollow rotor drives the friction welding seat and the friction welding head to rotate synchronously through the cooperation of the insertion post and the positioning insertion hole. The additive part passes through the channel inside the friction welding seat and the friction welding head and extends out from the bottom end of the friction welding head. This device can continuously supply material to the deposition area during the rotation of the friction welding head. At the same time, through the heat circulation between the spiral transfer tube and the sleeve module, the heat distribution in the deposition area tends to be uniform, avoiding the coarsening of the structure caused by local overheating. It solves the technical problems that the single stirring head structure is difficult to balance the molding quality and the travel speed, and the poor heat circulation control is prone to causing the coarsening of the structure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the front view of the disassembled structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall front structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the combined front side view of the present invention;

[0022] Figure 4 This is a schematic diagram of the combined structure of the support shell and the fixed base plate of the present invention;

[0023] Figure 5 This is a top view of the overall structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the sleeve module structure of the present invention;

[0025] Figure 7 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0026] Figure 8For the present invention Figure 5 Enlarged structural diagram at point B.

[0027] Legend:

[0028] 1. Support housing; 101. Fixed base plate; 1011. Docking mounting plate; 1012. Mounting hole; 2. Connecting frame; 201. Driven wheel; 2011. Driven wheel; 2012. Feeding motor; 3. Support baffle; 301. Spiral transmission pipe; 3011. Docking pipe; 3012. Additive component; 4. Hollow motor; 401. Hollow rotor; 5. Mounting bracket; 501. Insertion slot; 5011. Connecting bolt; 5012. Friction welding base; 5013. Positioning insertion hole; 5014. Friction welding head; 6. Sleeve module; 601. Fixed end plate; 6011. Docking branch pipe; 6012. Docking plug. Detailed Implementation

[0029] Reference Figure 1 - Figure 8 The present invention provides an efficient and low-heat-loss friction stir welding additive manufacturing equipment, comprising a support housing 1, with two connecting frames 2 fixedly connected to the inner side of the support housing 1. The two connecting frames 2 are symmetrically fixedly arranged on the left and right sides inside the support housing 1. A driven wheel 201 and a driving wheel 2011 are rotatably connected to the inner side of the two connecting frames 2, respectively. A feeding motor 2012 is fixedly connected to the outer side of the connecting frames 2. The feeding motor 2012 is used to drive the driving wheel 2011 to rotate. An additive part 3012 is conveyed to the inner side of the driving wheel 2011 and the driven wheel 201. A support baffle 3 is fixedly connected to the inner side of the support housing 1. The support baffle 3 has an annular structure. A spiral transmission pipe 301 with a spiral structure is fixedly connected to the bottom end of the support baffle 3. The spiral transmission pipe 301 is located outside the additive part 3012.

[0030] Among them, the outer side of the spiral transmission tube 301 is fixedly connected with a docking pipe 3011. There are two docking pipes 3011 in total. The two docking pipes 3011 are symmetrically fixed on the left and right sides of the spiral transmission tube 301. The docking pipes 3011 extend outward to support the housing 1.

[0031] The top of the support housing 1 is fixedly connected to a fixed base plate 101, which is used to connect with the welding machine body. The bottom of the support housing 1 is also fixedly connected to a docking mounting plate 1011. Both the fixed base plate 101 and the docking mounting plate 1011 have mounting holes 1012 inside.

[0032] The hollow motor 4 is embedded inside the support housing 1, and a hollow rotor 401 is rotatably connected inside the hollow motor 4. The hollow motor 4 is used to drive the hollow rotor 401 to rotate.

[0033] Among them, the bottom end of the hollow rotor 401 is fixedly connected with the insert pin in an annular array, and the bottom end of the docking mounting plate 1011 is equipped with the mounting support 5. The mounting support 5 also has four screw holes in an annular array inside. The screw holes are threaded with the connecting bolt 5011, which is used to connect with the docking mounting plate 1011 by thread.

[0034] Among them, a groove is provided on the side of the mounting support 5 near the docking mounting plate 1011. This groove is an insertion groove 501. A friction welding seat 5012 is rotatably connected inside the insertion groove 501. The friction welding seat 5012 is rotatably set in the mounting support 5 through a bearing seat.

[0035] The friction welding base 5012 has a ring array of positioning holes 5013 on its top surface. The positioning holes 5013 are adapted to the pins fixed at the bottom of the hollow rotor 401 and are used to insert the pins into the interior of the positioning holes 5013 to complete the connection between the hollow rotor 401 and the friction welding base 5012.

[0036] The friction welding base 5012 is fixedly connected to the bottom end of the friction welding head 5014. The friction welding head 5014 passes through the mounting support 5 on the lower side. Both the friction welding base 5012 and the friction welding head 5014 have bidirectional channels that run through both the upper and lower sides. These channels are used for the additive part 3012 to pass through.

[0037] Among them, the bottom end of the mounting support 5 is equipped with a sleeve module 6. The sleeve module 6 has an internal hollow structure and a heat transfer medium is installed inside the sleeve module 6. Six fixed end plates 601 for connecting with the mounting support 5 are fixedly connected in a ring array on the outer wall of the sleeve module 6.

[0038] Among them, the outer side of the sleeve module 6 is fixedly connected to the docking branch pipe 6011, and the outer side of the docking branch pipe 6011 is fixedly connected to the docking plug 6012 for connecting with the docking pipe 3011. The sleeve module 6 is cyclically connected to the spiral transmission pipe 301 through the docking branch pipe 6011 and the docking pipe 3011.

[0039] Working principle: When the feeding motor 2012 is started, its output shaft drives the drive wheel 2011 to rotate. The drive wheel 2011, through contact friction with the driven wheel 201, drives the driven wheel 201 to rotate synchronously in the opposite direction. The drive wheel 2011 and the driven wheel 201 together form a roller conveyor structure. The additive part 3012 is fed into the gap between the drive wheel 2011 and the driven wheel 201. Under the clamping force and friction generated by their rotation, the additive part 3012 is continuously pushed downwards in the vertical direction. The conveying process is continuous and stable. After the additive component 3012 disengages from the clamping area of ​​the driving wheel 2011 and the driven wheel 201, it enters the annular internal space enclosed by the support baffle 3. The support baffle 3 constrains the initial falling direction of the additive component 3012, preventing it from tilting or deviating before entering the spiral transfer tube 301. Subsequently, the additive component 3012 enters the spiral transfer tube 301, which has a spiral structure and surrounds the outside of the additive component 3012. Moving downwards along the axial center of the spiral transfer tube 301, the inner wall of the spiral transfer tube 301 provides circumferential restraint for the additive component 3012, preventing it from swaying or bending during transport. At the same time, the spiral structure of the spiral transfer tube 301 significantly increases the flow path length of the heat transfer medium inside the tube, extending the residence time of the heat transfer medium inside the tube and providing sufficient space and time for heat exchange between the heat transfer medium and the additive component 3012. During the downward movement of the additive component 3012 inside the spiral transfer tube 301, a certain gap is maintained between its outer surface and the inner wall of the spiral transfer tube 301. This gap allows the heat of the heat transfer medium to be transferred to the surface of the additive component 3012 through the tube wall and the air layer, causing the temperature of the additive component 3012 to gradually increase before entering the friction welding area. This preheating process increases the material softening degree of the additive component 3012, reducing the mechanical energy consumption required in the subsequent friction welding process. The additive component 3012 continues to move downwards, gradually approaching the outlet end of the spiral transfer tube 301, preparing to enter the internal channel of the friction welding head 5014.

[0040] The additive component 3012 continues to be conveyed downwards. After exiting from the bottom outlet of the spiral transfer tube 301, it passes sequentially through the channels inside the friction welding base 5012 and the friction welding head 5014. The channels inside the friction welding base 5012 and the friction welding head 5014 are coaxially aligned in the vertical direction, and the inner diameter of the channels is slightly larger than the outer diameter of the additive component 3012 to ensure that the additive component 3012 can pass downwards without obstruction. The additive component 3012 finally extends a predetermined length from the bottom end of the friction welding head 5014. This extension length is determined by the conveying capacity of the driving wheel 2011 and the driven wheel 201, as well as the moving speed of the friction welding head 5014. Simultaneously, the hollow motor 4 is powered on and starts. The stator winding inside the hollow motor 4 generates a rotating magnetic field, which drives the hollow rotor 401 to start rotating at high speed. The hollow rotor 401, as the output component of the hollow motor 4, has its rotation axis coaxial with the conveying axis of the additive component 3012. The insertion post fixed at the bottom of the hollow rotor 401 rotates synchronously with the hollow rotor 401. The insertion post extends downward and inserts into the positioning insertion hole 5013 opened on the top surface of the friction welding seat 5012. The opening position of the positioning insertion hole 5013 corresponds one-to-one with the setting position of the insertion post. A clearance fit or interference fit is formed between the outer diameter of the insertion post and the inner diameter of the positioning insertion hole 5013, so that the insertion post can be aligned with the inner diameter of the positioning insertion hole 5013 in the circumferential direction after insertion. The friction welding base 5012 forms a fixed connection, while allowing the insertion and removal of the insertion pin in the axial direction. The fit between the insertion pin and the positioning insertion hole 5013 ensures that the rotational motion of the hollow rotor 401 can be transmitted to the friction welding base 5012 without damage. The friction welding base 5012 is rotatably mounted inside the insertion groove 501 of the mounting support 5 via a bearing housing. The bearing housing contains rolling elements or sliding bearings, allowing the friction welding base 5012 to rotate freely inside the mounting support 5 without direct frictional contact with the mounting support 5, thereby reducing mechanical losses during rotation. Driven by the hollow rotor 401, the friction welding base 5012 begins to rotate, driving the friction welding head 5 fixedly connected to its bottom end. 014 rotates synchronously. The friction welding head 5014 passes downward through the through hole at the bottom of the mounting support 5 and extends to the outside of the bottom end of the mounting support 5. After extending, the bottom end face of the friction welding head 5014 is basically flush with or slightly lower than the bottom end face of the additive part 3012. At this time, the additive part 3012 extending from the bottom end of the friction welding head 5014 rotates together with the friction welding head 5014 and is ready to contact the substrate or the previous deposition layer. The entire rotation transmission chain starts from the hollow motor 4, passes through the hollow rotor 401, the insertion post, the positioning insertion hole 5013, and the friction welding seat 5012 to the friction welding head 5014. There are no additional transmission elements in the middle, resulting in high transmission efficiency and good rotational coaxiality.

[0041] When the friction welding head 5014 moves vertically downward under the drive of the motion system and comes into contact with the substrate surface or the surface of the previous deposited layer, a high-speed relative motion occurs between the bottom end face of the friction welding head 5014 and the workpiece surface. Heat is rapidly generated in the contact area due to friction. This heat raises the temperature of the substrate material, the previous deposited layer material, and the end material of the additive part 3012 to a plastic state. The plasticized material undergoes plastic flow under the rotating and stirring action of the friction welding head 5014, filling the area traversed by the friction welding head 5014. With the friction... The welding head 5014 moves horizontally along a preset path. The additive component 3012 is continuously fed downwards by the driving wheel 2011 and the driven wheel 201. The end of the additive component 3012 at the bottom of the friction welding head 5014 gradually softens under frictional heat and is pressed into the deposition area, bonding with the substrate or the previous deposited layer material. Because the additive component 3012 is continuously supplied downwards while the friction welding head 5014 continuously rotates and moves, the deposition process can proceed continuously without interruption, achieving continuous material supply in the additive manufacturing process. Simultaneously, friction welding... During rotation, the head 5014 applies a forging action to the deposited material, further densifying the plasticized material. The shoulder portion of the friction welding head 5014 rolls the surface of the deposited layer, removing any pores or oxide inclusions that may exist within the plasticized material, making the internal structure of the deposited layer more dense and uniform. As the friction welding head 5014 moves, the plasticized material at the front is squeezed to the rear and cools and solidifies, forming a defect-free solid phase deposited layer. There is no direct relationship between the rotation direction of the friction welding head 5014 and the rotation directions of the driving wheel 2011 and the driven wheel 201. The two are constrained and can be adjusted independently according to process requirements. After the deposition layer is formed, the friction welding head 5014 continues to move forward. The newly formed deposition layer gradually cools down and reaches a stable state under the cooling effect of the environment. During the entire deposition process, a matching relationship is formed between the conveying speed of the additive part 3012 and the moving speed of the friction welding head 5014. If the conveying is too fast, the additive part 3012 will accumulate. If the conveying is too slow, the deposition material will be insufficient. The matching between the two is maintained by the rotation speed of the feeding motor 2012 and the moving speed of the motion system.

[0042] During the high-speed rotation of the friction welding head 5014 and the generation of frictional heat, the temperature of the friction welding head 5014 itself and the deposition area increases significantly. Some of the heat is conducted upward through the friction welding head 5014 to the friction welding base 5012 and the mounting support 5, some heat is dissipated to the surrounding air through radiation and convection, and some heat is conducted downward through the substrate. A heat transfer medium is pre-installed inside the sleeve module 6. The heat transfer medium exchanges heat with the components around the deposition area inside the sleeve module 6, absorbing the excess heat conducted and radiated outward by the friction welding head 5014 and the deposition area. The sleeve module 6 has a ring-shaped structure surrounding the outside of the friction welding head 5014, and its internal hollow cavity contains the heat transfer medium. The heat transfer medium is in full contact with the inner wall of the sleeve module 6. After absorbing heat, the temperature of the heat transfer medium increases and its density changes. Under the action of natural convection or external driving force, it flows along the connecting branch pipe 6011. The heat transfer medium enters the connecting pipe 3011 through the connecting plug 6012 and then flows into the spiral transfer pipe 301. The spiral transfer pipe 301 has a spiral structure and is located on the outside of the additive component 3012. When the high-temperature heat transfer medium flows inside the spiral transfer pipe 301, it releases heat through the pipe wall of the spiral transfer pipe 301 to the additive component 3012 located on the inside of the pipe. During the flow of the heat transfer medium in the spiral transfer pipe 301, its temperature gradually decreases, and the heat is transferred to the additive component 3012. After receiving heat, the surface temperature of the additive component 3012 increases, and the heat is further conducted into the interior of the additive component 3012. This process ensures a more uniform cross-sectional temperature for the entire additive component 3012. The preheated additive component 3012 experiences an increased end temperature and improved material softening, reducing the frictional heat input required for subsequent entry into the friction welding area. This reduces dependence on the rotational speed and downward pressure of the friction welding head 5014. This preheating process also reduces the temperature difference between the additive component 3012 and the substrate, improving interlayer bonding quality. After releasing heat, the heat transfer medium cools and flows out through the outlet on the other side of the spiral transfer tube 301, returning to the sleeve module 6 via the docking pipe 3011, docking plug 6012, and docking branch pipe 6011 on the other side. There, it reabsorbs heat from the deposition area, forming a complete circulation. During this circulation process, the heat transfer medium continuously flows within the sleeve module... The block 6 flows back and forth between the spiral transfer tube 301, continuously transferring excess heat from the deposition area to the preheating area of ​​the additive component 3012, realizing spatial transfer and reuse of heat. The support shell 1 provides structural support and external interface connection for the internal components. The fixed base plate 101 connects the entire device to the welding machine body, enabling the device to move together with the motion system of the welding machine body. The mating mounting plate 1011 and the connecting bolt 5011 fix the mounting support 5 to the bottom end of the support shell 1, ensuring that the mounting support 5 does not loosen during operation. The fixed end plate 601 fixes the sleeve module 6 to the bottom end of the mounting support 5, maintaining a relatively fixed positional relationship between the sleeve module 6 and the friction welding head 5014. The entire device achieves this through the coordinated action of its components.This system enables continuous conveying of the additive manufacturing part 3012, rotary deposition of the friction welding head 5014, and recovery and reuse of heat from the deposition area. It reduces heat loss to the support housing 1 and the external environment, allowing the heat generated by friction to be preferentially used for preheating the material to be deposited, thus improving thermal energy utilization efficiency.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment, comprising a support housing (1), characterized in that: The inner side of the support housing (1) is fixedly connected to a frame (2). There are two frames (2). The two frames (2) are symmetrically fixed on the left and right sides inside the support housing (1). The inner sides of the two frames (2) are respectively rotatably connected to a driven wheel (201) and a driving wheel (2011). The outer side of the frame (2) is fixedly connected to a feeding motor (2012). The feeding motor (2012) is used to drive the driving wheel (2011) to rotate. The inner sides of the driving wheel (2011) and the driven wheel (201) convey an additive part (3012). The inner side of the support housing (1) is fixedly connected to a support baffle (3). The support baffle (3) is a ring structure. The bottom end of the support baffle (3) is fixedly connected to a spiral transmission tube (301) with a spiral structure. The spiral transmission tube (301) is located on the outer side of the additive part (3012).

2. The high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment according to claim 1, characterized in that: The outer side of the spiral transmission tube (301) is fixedly connected with a docking pipe (3011). There are two docking pipes (3011). The two docking pipes (3011) are symmetrically fixed on the left and right sides of the spiral transmission tube (301). The docking pipes (3011) extend outward to support the housing (1).

3. The high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment according to claim 1, characterized in that: The top end of the support housing (1) is fixedly connected to a fixed base plate (101), which is used to connect with the welding machine body. The bottom end of the support housing (1) is also fixedly connected to a docking mounting plate (1011). Both the fixed base plate (101) and the docking mounting plate (1011) have mounting holes (1012) inside.

4. The high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment according to claim 1, characterized in that: A hollow motor (4) is embedded inside the support housing (1), and a hollow rotor (401) is rotatably connected inside the hollow motor (4). The hollow motor (4) is used to drive the hollow rotor (401) to rotate.

5. The high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment according to claim 4, characterized in that: The hollow rotor (401) has a ring array of fixed pins at its bottom end, and the mounting plate (1011) has a mounting bracket (5) at its bottom end. The mounting bracket (5) also has four screw holes in a ring array inside, and the screw holes are threaded with connecting bolts (5011). The connecting bolts (5011) are used to thread with the mounting plate (1011).

6. The high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment according to claim 5, characterized in that: The mounting bracket (5) has a groove on the side near the docking mounting plate (1011). The groove is an insertion groove (501). A friction welding seat (5012) is rotatably connected inside the insertion groove (501). The friction welding seat (5012) is rotatably set inside the mounting bracket (5) through a bearing seat.

7. The high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment according to claim 6, characterized in that: The friction welding base (5012) has a ring array of positioning holes (5013) on its top surface. The positioning holes (5013) are adapted to the pins fixed at the bottom of the hollow rotor (401) and are used to insert the pins into the interior of the positioning holes (5013) to complete the connection between the hollow rotor (401) and the friction welding base (5012).

8. The high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment according to claim 7, characterized in that: The friction welding base (5012) is fixedly connected to the bottom end of the friction welding head (5014). The friction welding head (5014) passes through the mounting bracket (5) on the lower side. Both the friction welding base (5012) and the friction welding head (5014) have bidirectional channels that run through both the upper and lower sides. These channels are used for the additive part (3012) to pass through.

9. The high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment according to claim 8, characterized in that: The bottom end of the mounting support (5) is equipped with a sleeve module (6). The sleeve module (6) has an internal hollow structure and a heat transfer medium is provided inside the sleeve module (6). Six fixed end plates (601) for connecting with the mounting support (5) are fixedly connected in a ring array on the outer wall of the sleeve module (6).

10. The high-efficiency, low-heat-loss friction stir welding additive manufacturing equipment according to claim 9, characterized in that: The outer side of the sleeve module (6) is fixedly connected to a docking branch pipe (6011), and the outer side of the docking branch pipe (6011) is fixedly connected to a docking plug (6012) for connecting with the docking pipe (3011). The sleeve module (6) is cyclically connected to the spiral transmission pipe (301) through the docking branch pipe (6011), the docking pipe (3011), and the spiral transmission pipe (301).

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