Friction stir welding additive manufacturing device and method capable of continuously feeding rods

Abstract

The invention relates to the technical field of friction stir welding additive manufacturing, in particular to a friction stir welding additive manufacturing device and method capable of continuously feeding bars. The friction stir welding additive manufacturing device comprises a shell, a feeding mechanism is installed in the shell, a feeding mechanism is installed in the shell, and a stabilizing mechanism is installed in the shell; a stirring head is movably mounted at the bottom of the stabilizing mechanism, a bar is placed in the feeding mechanism and penetrates through the stabilizing mechanism and the stirring head, and a driving mechanism is mounted between the feeding mechanism and the stirring head. The feeding mechanism comprises a rod storage box, a push block, a first spring, a feeding port, a discharging port, a shifting block and a sliding groove. According to the automatic bar feeding device, the production efficiency, the welding quality and the product consistency are improved through cooperation of all the mechanisms, the problem that an existing device cannot automatically and continuously feed bars is solved, meanwhile, the stability of the device is enhanced through the overall structural design, the service life is prolonged, the maintenance cost is reduced, and the production reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of friction stir welding additive manufacturing, and in particular to a friction stir welding additive manufacturing device and method capable of continuously feeding rods. Background Art

[0002] With the development of society, the application of stir friction welding in the manufacturing industry has become more and more extensive, and stir friction welding additive technology has become one of the key technologies in the manufacturing field. In many industries such as aerospace, automobile manufacturing, and shipbuilding, the demand for high-quality and high-precision parts manufacturing is increasing. Stir friction welding additives can achieve efficient connection and accumulation of materials and produce parts with complex shapes and excellent performance. For example, in the manufacture of aircraft engine blades, stir friction welding additives can accurately add materials and form specific structures, improve the strength and high temperature resistance of the blades, and meet the high performance requirements of aircraft engines.

[0003] However, the existing devices have obvious defects. In the actual production process, manual intervention in the rod feeding process is required frequently, which not only increases the labor intensity of operators, but also greatly reduces production efficiency. Since manual operation is difficult to ensure the consistency of the timing and speed of each rod feeding, it is easy to cause instability in the welding process, resulting in uneven weld quality and welding defects such as pores and cracks, which seriously affect the quality and reliability of the product. At the same time, frequent manual operation will also increase the production cycle and cost, which is not conducive to the efficient development of large-scale industrial production, and limits the further application and development of stir friction welding additive technology in the manufacturing industry. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a friction stir welding additive manufacturing device and method capable of continuously feeding rods.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a friction stir welding additive manufacturing device capable of continuously feeding rods, comprising a shell, a feeding mechanism is installed inside the shell, a feeding mechanism is installed inside the shell, a stabilizing mechanism is installed inside the shell, a stirring head is movably installed at the bottom of the stabilizing mechanism, a rod is placed inside the feeding mechanism, the rod passes through the inside of the stabilizing mechanism and the stirring head, and a driving mechanism is installed between the feeding mechanism and the stirring head;

[0006] The feeding mechanism includes a rod storage box, a push block, a first spring, a feed port, a discharge port, a shift block and a slide slot. The rod storage box is fixedly installed inside the outer shell, and the push block is slidably installed inside the rod storage box. The first spring has multiple fixed connections between the inner wall of the rod storage box and the outer wall of the push block. The feed port is opened at the top of the rod storage box, and the discharge port is opened at the bottom of the rod storage box. A plurality of rods distributed in parallel are placed inside the rod storage box, and the shift block is fixedly connected to the top of the push block, and the slide slot is opened at the top of the rod storage box, and the shift block is located inside the slide slot.

[0007] The feeding mechanism includes a first feeding wheel, a second feeding wheel, a third feeding wheel, a first driving gear, a pulley and a driving belt. The first feeding wheel is movably installed inside the shell. The first feeding wheel is located at the discharge end of the push block and is in contact with the rod. The second feeding wheel and the third feeding wheel are both movably installed inside the shell. The rod is located between the second feeding wheel and the third feeding wheel. The rear ends of the second feeding wheel and the third feeding wheel are fixedly connected to the first driving gear. The two first driving gears are meshed with each other. The first feeding wheel is located directly above the third feeding wheel. The rear ends of the first driving gears at the rear ends of the first feeding wheel and the third feeding wheel are fixedly connected to the pulley, and a driving belt is sleeved between the two pulleys.

[0008] The stabilizing mechanism includes a support tube, an installation cavity, a support shaft, a mounting frame, a roller and a second spring. The support tube is fixedly installed inside the outer shell, and the support tube is located directly below the second feeding wheel and the third feeding wheel. The mounting cavity is opened inside the support tube, and the support shaft has a plurality of rectangular shapes fixedly connected to the inside of the installation cavity. The mounting frame has a plurality of rectangular shapes slidably installed on the outer walls of the two support shafts. The roller is movably installed on the front end of the mounting frame. The second spring is fixedly connected between the inner wall of the installation cavity and the outer wall of the mounting frame. The second spring is sleeved on the outer wall of the support shaft. The rod passes through the support tube and is located between the plurality of rollers.

[0009] The driving mechanism includes a driving motor, a driving shaft, a bevel gear and a bevel gear ring. The driving motor is fixedly installed inside the outer shell, the driving shaft is fixedly installed at the output end of the driving motor, the bevel gear is fixedly connected to the end of the driving shaft away from the driving motor, the bevel gear ring is fixedly connected to the outer wall of the stirring head, and the bevel gear and the bevel gear ring are meshed with each other.

[0010] The driving mechanism also includes a second driving gear and a third driving gear, the second driving gear is fixedly connected to the outer wall of the driving shaft, the second driving gear is located between the driving motor and the bevel gear, the third driving gear is fixedly connected to the rear end of the pulley on the third feeding wheel, the second driving gear and the third driving gear are meshed with each other, and the third driving gear has a larger diameter than the driving shaft and more tooth grooves.

[0011] A first support frame is fixedly connected to the top of the inner wall of the shell, a second support frame is fixedly connected to the inside of the shell, a third support frame is fixedly connected to the inside of the shell, the second support frame is located on the top of the third support frame, the first feeding wheel is movably installed inside the first support frame, the second feeding wheel and the third feeding wheel are movably installed inside the second support frame, and the support tube is movably installed inside the third support frame.

[0012] The outer wall of the shell is fixedly connected with a protection box, and the driving motor is located inside the protection box.

[0013] The outer wall of the shell is fixedly connected with a connecting frame, and the connecting frame has a plurality of rectangular shapes and is distributed on the outer wall of the shell.

[0014] An annular groove is provided at the bottom of the support cylinder, and an annular block is fixedly connected to the top of the stirring head. The annular block is movably installed inside the annular groove.

[0015] A method for additive manufacturing by friction stir welding with continuous rod feeding, using the above-mentioned additive manufacturing device by friction stir welding with continuous rod feeding, comprises the following steps:

[0016] S1. Place the rod vertically inside the feeding mechanism, turn on the driving mechanism, and the driving mechanism drives the feeding mechanism and the stirring head at the same time;

[0017] S2, then the plurality of rods are fed in the direction of the feeding mechanism in sequence by the feeding mechanism, and then the rods are transported from top to bottom by the feeding mechanism to the inside of the stabilizing mechanism and the stirring head;

[0018] S3, the stirring head is rotated at high speed through the driving mechanism. The stirring head contacts the workpiece at the starting position. Then the friction heat generated by the rotation of the stirring head softens the material in the contact area, forming a local "plastic state zone". At the same time, the rod and the inner and outer walls of the stirring head generate friction and heat, so that the rod reaches a thermoplastic state;

[0019] S4. As the machine tool drives the stirring head to move, under the stirring action of the stirring head and in coordination with the stable material drying of the feeding mechanism, the softened rod flows along the forward direction of the stirring head and is deposited on the existing material, thus realizing additive manufacturing.

[0020] The present invention has the following beneficial effects:

[0021] 1. Compared with the prior art, by setting a feeding mechanism, a feeding mechanism, a stabilizing mechanism and a driving mechanism, when working, firstly, the rods are placed in the rod storage box through the feeding port, and the rods are arranged neatly and close to the discharge port under the action of the push block and the first spring, and then the driving motor is turned on, the driving motor drives the driving shaft to rotate, and the bevel gear on the driving shaft meshes with the bevel gear ring on the outer wall of the stirring head, so that the stirring head rotates at high speed, and at the same time, the second driving gear on the driving shaft meshes with the third driving gear on the third feeding wheel, and the first feeding wheel and the third feeding wheel are driven to work together through the transmission of the pulley and the driving belt. In the feeding mechanism, the push block pushes the rods out of the discharge port under the push of the first spring, and the rods enter the feeding mechanism. The first feeding wheel first contacts the rods and uses friction to drive them to move downward, and then the rods enter between the second feeding wheel and the third feeding wheel, and continue to be stably conveyed under the clamping and driving of the two feeding wheels. After that, the rod enters the support cylinder of the stabilizing mechanism, and under the support of multiple rollers and the elastic adjustment of the second spring, it maintains a stable linear motion state and is accurately transported to the inside of the stirring head. The present invention improves production efficiency, ensures the continuity of the welding process, reduces welding defects caused by untimely or unstable feeding of rods, effectively solves the problem that the existing device cannot automatically and continuously feed rods to increase materials, and improves welding quality and product consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle;

[0023] Figure 2 It is a schematic diagram of the structure of the second viewing angle of the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the internal structure of the present invention;

[0026] Figure 5 for Figure 4 A schematic diagram of the structure from another perspective;

[0027] Figure 6 for Figure 5 The enlarged structural diagram at A in the middle;

[0028] Figure 7 for Figure 5 The enlarged structural diagram at B in the middle;

[0029] Figure 8 It is a schematic diagram of the explosion structure of the feeding mechanism in the present invention;

[0030] Fig. 9 It is an enlarged structural schematic diagram of the stabilizing mechanism in the present invention;

[0031] Fig.10 for Fig. 9 Schematic diagram of the C structure.

[0032] Legend:

[0033] 1. Shell; 101. First support frame; 102. Second support frame; 103. Third support frame; 104. Protection box; 2. Feeding mechanism; 201. Rod storage box; 202. Push block; 203. First spring; 204. Feeding port; 205. Discharging port; 206. Diverter block; 207. Slide; 3. Feeding mechanism; 301. First feeding wheel; 302. Second feeding wheel; 303. Third feeding wheel; 304. First driving gear; 305. Belt Wheel; 306, driving belt; 4, stabilizing mechanism; 401, supporting cylinder; 402, mounting cavity; 403, supporting shaft; 404, mounting frame; 405, roller; 406, second spring; 5, stirring head; 6, driving mechanism; 601, driving motor; 602, driving shaft; 603, bevel gear; 604, bevel gear ring; 605, second driving gear; 606, third driving gear; 7, connecting frame; 8, annular groove; 9, annular block; 10, rod. DETAILED DESCRIPTION

[0034] Reference Figure 1-10The present invention provides a friction stir welding additive manufacturing device capable of continuously feeding rods: comprising a shell 1, the shell 1 serves as an external protection and support structure of the entire device, and can protect internal components from interference and mechanical damage from the external environment. A feeding mechanism 2 is installed inside the shell 1, and the feeding mechanism 2 is responsible for storing and providing rods 10. A feeding mechanism 3 is installed inside the shell 1, and the feeding mechanism 3 is used to accurately transport the rods 10 to the stabilizing mechanism 4 and the stirring head 5. The stabilizing mechanism 4 is installed inside the shell 1, and the stabilizing mechanism 4 ensures that the rods 10 are transported. In order to ensure the stability during feeding, a stirring head 5 is movably installed at the bottom of the stabilizing mechanism 4, and the stirring head 5 is the core component for realizing friction stir welding. A rod 10 is placed inside the feeding mechanism 2, and the rod 10 runs through the inside of the stabilizing mechanism 4 and the stirring head 5. A driving mechanism 6 is installed between the feeding mechanism 3 and the stirring head 5, and the driving mechanism 6 provides power for the rotation of the feeding mechanism 3 and the stirring head 5; the feeding mechanism 2 includes a rod storage box 201, a push block 202, a first spring 203, a feed port 204, a discharge port 205, a shift block 206 and a slide groove 207, and a rod storage box 201 is provided. The box 201 is fixedly installed inside the housing 1. The capacity and size of the rod storage box 201 are designed according to the length and number of the rods 10, and is used to store multiple rods 10. The push block 202 is slidably installed inside the rod storage box 201. The surface of the push block 202 is smooth and well matched with the inner wall of the rod storage box 201, and is used to push the rod 10 out of the rod storage box 201. The first spring 203 has a plurality of fixed connections between the inner wall of the rod storage box 201 and the outer wall of the push block 202. The first spring 203 provides elastic force, so that the push block 202 can push the rod 10 to move. The feed port 204 is opened at the top of the rod storage box 201 to facilitate the loading of the rods 10. The discharge port 205 is opened at the bottom of the rod storage box 201 so that the rods 10 can smoothly leave the rod storage box 201. A plurality of rods 10 distributed in parallel are placed inside the rod storage box 201. The shift block 206 is fixedly connected to the top of the push block 202. The shift block 206 is used to control the movement of the push block 202. The slide groove 207 is opened at the top of the rod storage box 201. The shift block 206 is located inside the slide groove 207 to ensure that the shift block 206 can move stably in the slide groove 207.

[0035] The feeding mechanism 3 includes a first feeding wheel 301, a second feeding wheel 302, a third feeding wheel 303, a first driving gear 304, a pulley 305 and a driving belt 306. The first feeding wheel 301 is movably mounted inside the housing 1. The first feeding wheel 301 is located at the discharge end of the push block 202 and fits the rod 10. The surface of the first feeding wheel 301 has a certain friction force, which can effectively drive the rod 10 to move. The second feeding wheel 302 and the third feeding wheel 303 are both movably mounted inside the housing 1. The rod 10 is located between the second feeding wheel 302 and the third feeding wheel 303. The rear ends of the wheels 303 are fixedly connected with the first driving gear 304, and the two first driving gears 304 are meshed with each other to ensure that the second feeding wheel 302 and the third feeding wheel 303 can rotate synchronously in the opposite direction to achieve stable clamping and transportation of the bar 10. The first feeding wheel 301 is located directly above the third feeding wheel 303, and the rear ends of the first driving gears 304 at the rear ends of the first feeding wheel 301 and the third feeding wheel 303 are fixedly connected with pulleys 305, and a driving belt 306 is sleeved between the two pulleys 305. Power transmission is achieved through belt transmission, so that the first feeding wheel 301 and the third feeding wheel 303 can work together.

[0036] The stabilizing mechanism 4 includes a support cylinder 401, an installation cavity 402, a support shaft 403, a mounting frame 404, a roller 405 and a second spring 406. The support cylinder 401 is fixedly installed inside the housing 1. The support cylinder 401 is located directly below the second feeding wheel 302 and the third feeding wheel 303. The support cylinder 401 provides a stable channel for the transportation of the rod 10. The installation cavity 402 is opened inside the support cylinder 401. The support shaft 403 has a plurality of rectangular shapes fixedly connected to the inside of the installation cavity 402. The support shaft 403 provides an installation base and sliding support for the mounting frame 404. The mounting frame 404 has a plurality of rectangular shapes slidingly installed on the two The outer wall of the support shaft 403, the mounting frame 404 can slide flexibly on the support shaft 403, the roller 405 is movably installed at the front end of the mounting frame 404, the roller 405 is in contact with the rod 10, reducing the friction of the rod 10 during the transportation process, the second spring 406 is fixedly connected between the inner wall of the mounting cavity 402 and the outer wall of the mounting frame 404, the second spring 406 is sleeved on the outer wall of the support shaft 403, the second spring 406 provides elastic force, so that the roller 405 can automatically adjust its position according to the diameter of the rod 10 to ensure stable clamping of the rod 10, and the rod 10 passes through the support tube 401 and is located between multiple rollers 405.

[0037] The driving mechanism 6 includes a driving motor 601, a driving shaft 602, a bevel gear 603 and a bevel gear ring 604. The driving motor 601 is fixedly installed inside the housing 1. The driving motor 601 is selected with appropriate power and speed to meet the power requirements of stirring and feeding. The driving shaft 602 is fixedly installed at the output end of the driving motor 601. The driving shaft 602 is tightly connected to the output shaft of the driving motor 601. The bevel gear 603 is fixedly connected to the end of the driving shaft 602 away from the driving motor 601. The bevel gear 603 and the bevel gear ring 604 are meshed with each other, and the rotation drive of the stirring head 5 is realized through the bevel gear transmission.

[0038] The driving mechanism 6 also includes a second driving gear 605 and a third driving gear 606. The second driving gear 605 is fixedly connected to the outer wall of the driving shaft 602. The second driving gear 605 is located between the driving motor 601 and the bevel gear 603. The third driving gear 606 is fixedly connected to the rear end of the pulley 305 on the third feeding wheel 303. The second driving gear 605 and the third driving gear 606 are meshed with each other. The third driving gear 606 has a larger diameter than the driving shaft 602 and more tooth grooves. The power distribution and speed control of the feeding mechanism 3 are realized through gear transmission.

[0039] A first support frame 101 is fixedly connected to the top of the inner wall of the shell 1, and the first support frame 101 provides installation and support for the first feeding wheel 301. A second support frame 102 is fixedly connected to the inside of the shell 1, and the second support frame 102 is used to install the second feeding wheel 302 and the third feeding wheel 303. A third support frame 103 is fixedly connected to the inside of the shell 1, and the second support frame 102 is located on the top of the third support frame 103. The third support frame 103 supports the stabilizing mechanism 4, the first feeding wheel 301 is movably installed inside the first support frame 101, the second feeding wheel 302 and the third feeding wheel 303 are movably installed inside the second support frame 102, and the support cylinder 401 is movably installed inside the third support frame 103.

[0040] A protection box 104 is fixedly connected to the outer wall of the housing 1 . The protection box 104 provides protection for the drive motor 601 to prevent it from being contaminated by external collisions and dust. The drive motor 601 is located inside the protection box 104 .

[0041] The outer wall of the shell 1 is fixedly connected with a connecting frame 7. The connecting frame 7 has a plurality of rectangular portions distributed on the outer wall of the shell 1. The connecting frame 7 facilitates installation of the friction stir welding manufacturing device at a designated position.

[0042] An annular groove 8 is provided at the bottom of the support cylinder 401, and an annular block 9 is fixedly connected to the top of the stirring head 5. The annular block 9 is movably installed inside the annular groove 8. The cooperation between the annular groove 8 and the annular block 9 ensures the relative position accuracy and stability of the stirring head 5 and the support cylinder 401, and facilitates the rotation of the stirring head 5.

[0043] A method for additive manufacturing by friction stir welding with continuous rod feeding, using the above-mentioned additive manufacturing device for friction stir welding with continuous rod feeding, characterized in that it comprises the following steps:

[0044] S1, vertically placing the rod 10 inside the feeding mechanism 2, turning on the driving mechanism 6, and the driving mechanism 6 drives the feeding mechanism 3 and the stirring head 5 at the same time;

[0045] S2, then the plurality of rods 10 are fed in sequence by the feeding mechanism 2 in the direction of the feeding mechanism 3, and then the rods 10 are transported from top to bottom by the feeding mechanism 3 to the inside of the stabilizing mechanism 4 and the stirring head 5;

[0046] S3, the stirring head 5 is rotated at a high speed through the driving mechanism 6, and the stirring head 5 contacts the workpiece (or the deposited material) at the starting position. Then, the friction heat generated by the rotation of the stirring head 5 softens the material in the contact area, forming a local "plastic state zone". At the same time, the rod 10 and the inner and outer walls of the stirring head 5 generate friction and heat, so that the rod 10 reaches a thermoplastic state;

[0047] S4. As the machine tool drives the stirring head 5 to move, under the stirring action of the stirring head 5 and in coordination with the stable material drying of the feeding mechanism 3, the softened rod 10 flows along the forward direction of the stirring head 5 and is deposited on the existing material, thereby realizing additive manufacturing.

[0048] Working principle: During operation, firstly, the rod 10 is placed in the rod storage box 201 through the feed port 204. Under the action of the push block 202 and the first spring 203, the rod 10 is arranged neatly and close to the discharge port 205. Then, the drive motor 601 is turned on. The drive motor 601 drives the drive shaft 602 to rotate. The bevel gear 603 on the drive shaft 602 meshes with the bevel gear ring 604 on the outer wall of the stirring head 5, so that the stirring head 5 rotates at high speed. At the same time, the second drive gear 605 on the drive shaft 602 meshes with the third drive gear 606 on the third feeding wheel 303. Through the transmission of the pulley 305 and the drive belt 306, the first feeding wheel 301 and the third feeding wheel 303 are driven to work together.

[0049] In the feeding mechanism 2, the push block 202 pushes the rod 10 out of the discharge port 205 under the push of the first spring 203, and the rod 10 enters the feeding mechanism 3. The first feeding wheel 301 first contacts the rod 10 and drives it downward by friction, and then the rod 10 enters between the second feeding wheel 302 and the third feeding wheel 303, and continues to be stably transported under the clamping and driving of the two feeding wheels. After that, the rod 10 enters the support cylinder 401 of the stabilizing mechanism 4, and maintains a stable linear motion state under the support of multiple rollers 405 and the elastic adjustment of the second spring 406, and is accurately transported to the inside of the stirring head 5.

[0050] At the stirring head 5, due to the high-speed rotation of the stirring head 5, the weldment and the rod 10 reach a thermoplastic state. Under the stirring action of the stirring head 5 and in coordination with the stable feeding of the feeding mechanism 3, the softened rod 10 flows along the forward direction of the stirring head 5 and is deposited on the existing material, thereby realizing additive manufacturing. Throughout the entire process, each mechanism continuously works in coordination to realize automatic and continuous feeding of the rod 10 and stable welding, thereby ensuring welding quality and efficiency.

[0051] Finally, it should be noted that the above 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 aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A friction stir welding additive manufacturing device capable of continuously feeding rods, comprising a housing (1), characterized in that: A feeding mechanism (2) is installed inside the housing (1), a feeding mechanism (3) is installed inside the housing (1), a stabilizing mechanism (4) is installed inside the housing (1), a stirring head (5) is movably installed at the bottom of the stabilizing mechanism (4), a rod (10) is placed inside the feeding mechanism (2), the rod (10) passes through the inside of the stabilizing mechanism (4) and the stirring head (5), and a driving mechanism (6) is installed between the feeding mechanism (3) and the stirring head (5); The feeding mechanism (2) comprises a rod storage box (201), a push block (202), a first spring (203), a feed port (204), a discharge port (205), a shift block (206) and a slide groove (207); the rod storage box (201) is fixedly mounted inside the housing (1); the push block (202) is slidably mounted inside the rod storage box (201); the first spring (203) has a plurality of fixedly connected inner walls of the rod storage box (201) and the push block (206). The rod storage box (201) is provided between the outer walls of the rod storage box (202), the feed port (204) is provided at the top of the rod storage box (201), the discharge port (205) is provided at the bottom of the rod storage box (201), a plurality of rods distributed in parallel are placed inside the rod storage box (201), the shifting block (206) is fixedly connected to the top of the push block (202), the slide groove (207) is provided at the top of the rod storage box (201), and the shifting block (206) is located inside the slide groove (207).

2. A friction stir welding additive manufacturing device capable of continuously feeding rods according to claim 1, characterized in that: The feeding mechanism (3) comprises a first feeding wheel (301), a second feeding wheel (302), a third feeding wheel (303), a first driving gear (304), a pulley (305) and a driving belt (306); the first feeding wheel (301) is movably mounted inside the housing (1); the first feeding wheel (301) is located at the discharge end of the push block (202) and is in contact with the rod (10); the second feeding wheel (302) and the third feeding wheel (303) are both movably mounted inside the housing (1); the rod is located at the discharge end of the push block (202) and is in contact with the rod (10); ) and a third feeding wheel (303), the rear ends of the second feeding wheel (302) and the third feeding wheel (303) are fixedly connected to a first driving gear (304), the two first driving gears (304) are meshed with each other, the first feeding wheel (301) is located directly above the third feeding wheel (303), the rear ends of the first driving gears (304) at the rear ends of the first feeding wheel (301) and the third feeding wheel (303) are fixedly connected to a pulley (305), and a driving belt (306) is sleeved between the two pulleys (305).

3. A friction stir welding additive manufacturing device capable of continuously feeding rods according to claim 2, characterized in that: The stabilizing mechanism (4) comprises a support cylinder (401), a mounting cavity (402), a support shaft (403), a mounting frame (404), a roller (405) and a second spring (406); the support cylinder (401) is fixedly mounted inside the housing (1); the support cylinder (401) is located directly below the second feeding wheel (302) and the third feeding wheel (303); the mounting cavity (402) is provided inside the support cylinder (401); the support shaft (403) has a plurality of rectangular rollers fixedly connected to the housing (1); Inside the mounting cavity (402), the mounting frame (404) has a plurality of rectangular slidably mounted on the outer walls of the two support shafts (403), the roller (405) is movably mounted on the front end of the mounting frame (404), the second spring (406) is fixedly connected between the inner wall of the mounting cavity (402) and the outer wall of the mounting frame (404), the second spring (406) is sleeved on the outer wall of the support shaft (403), and the rod (10) passes through the support tube (401) and is located between the plurality of rollers (405).

4. A friction stir welding additive manufacturing device capable of continuously feeding rods according to claim 2, characterized in that: The driving mechanism (6) comprises a driving motor (601), a driving shaft (602), a bevel gear (603) and a bevel gear ring (604); the driving motor (601) is fixedly mounted inside the housing (1); the driving shaft (602) is fixedly mounted at the output end of the driving motor (601); the bevel gear (603) is fixedly connected to an end of the driving shaft (602) away from the driving motor (601); the bevel gear ring (604) is fixedly connected to the outer wall of the stirring head (5); and the bevel gear (603) and the bevel gear ring (604) are meshed with each other.

5. A friction stir welding additive manufacturing device capable of continuously feeding rods according to claim 4, characterized in that: The driving mechanism (6) further comprises a second driving gear (605) and a third driving gear (606), wherein the second driving gear (605) is fixedly connected to the outer wall of the driving shaft (602), the second driving gear (605) is located between the driving motor (601) and the bevel gear (603), and the third driving gear (606) is fixedly connected to the rear end of the pulley (305) on the third feeding wheel (303), the second driving gear (605) and the third driving gear (606) are meshed with each other, and the third driving gear (606) has a larger diameter than the driving shaft (602) and has more tooth grooves.

6. The friction stir welding additive manufacturing device capable of continuously feeding rods according to claim 3, characterized in that: A first support frame (101) is fixedly connected to the top of the inner wall of the shell (1), a second support frame (102) is fixedly connected to the inside of the shell (1), a third support frame (103) is fixedly connected to the inside of the shell (1), the second support frame (102) is located on the top of the third support frame (103), the first feeding wheel (301) is movably mounted inside the first supporting frame (101), the second feeding wheel (302) and the third feeding wheel (303) are movably mounted inside the second supporting frame (102), and the supporting cylinder (401) is movably mounted inside the third supporting frame (103).

7. The friction stir welding additive manufacturing device capable of continuously feeding rods according to claim 4, characterized in that: The outer wall of the housing (1) is fixedly connected to a protection box (104), and the drive motor (601) is located inside the protection box (104).

8. The friction stir welding additive manufacturing device capable of continuously feeding rods according to claim 1, characterized in that: The outer wall of the housing (1) is fixedly connected to a connecting frame (7), and the connecting frame (7) has a plurality of rectangular portions distributed on the outer wall of the housing (1).

9. The friction stir welding additive manufacturing device capable of continuously feeding rods according to claim 3, characterized in that: An annular groove (8) is provided at the bottom of the support cylinder (401), and an annular block (9) is fixedly connected to the top of the stirring head (5), wherein the annular block (9) is movably mounted inside the annular groove (8).

10. A method for additive manufacturing by friction stir welding with continuous rod feeding, characterized in that: A friction stir welding additive manufacturing device capable of continuously feeding a rod using any one of claims 1 to 9 comprises the following steps: S1, placing the rod (10) vertically inside the feeding mechanism (2), turning on the driving mechanism (6), and the driving mechanism (6) drives the feeding mechanism (3) and the stirring head (5) simultaneously; S2, the plurality of rods (10) are then fed in sequence by the feeding mechanism (2) in the direction of the feeding mechanism (3), and then the rods (10) are transported by the feeding mechanism (3) from top to bottom to the inside of the stabilizing mechanism (4) and the stirring head (5); S3, the stirring head (5) is rotated at a high speed through the driving mechanism (6), the stirring head (5) contacts the workpiece at the starting position, and then the friction heat generated by the rotation of the stirring head (5) softens the material in the contact area, forming a local "plastic state zone", and at the same time, the rod (10) and the inner and outer walls of the stirring head (5) generate friction and heat, so that the rod (10) reaches a thermoplastic state; S4. As the machine tool drives the stirring head (5) to move, under the stirring action of the stirring head (5) and in coordination with the stable material drying of the feeding mechanism (3), the softened rod material (10) flows along the forward direction of the stirring head (5) and is deposited on the existing material, thereby realizing additive manufacturing.

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