Friction stir continuous additive manufacturing device

Abstract

The utility model relates to the technical field of friction-stir additive manufacturing, and discloses a friction-stir continuous additive manufacturing device which comprises a rotatable main shaft, the main shaft is internally provided with a feeding channel suitable for additive raw materials to pass through, and the feeding channel sequentially comprises a feeding area, a melting area, a solid-liquid phase mixing area and a solid phase area from top to bottom; the welding tool is fixedly connected with the main shaft, and the interior of the welding tool communicates with the feeding channel; the heating device and the material melting area of the feeding channel are correspondingly arranged, and the heating device is used for heating and melting the additive raw materials supplied by the feeding area, so that the melted additive raw materials flow into the solid-liquid phase mixing area under the action of gravity to form the additive raw materials in a solid-liquid phase mixing state; and the liquid cooling device is arranged corresponding to the solid phase area of the feeding channel and is used for cooling the additive raw material which flows in from the solid-liquid phase mixing area and is in the solid-liquid phase mixing state, so that an additive raw material rod in a preset shape is formed.

Description

Technical Field

[0001] This utility model relates to the field of friction stir additive manufacturing technology, and in particular to a friction stir continuous additive manufacturing apparatus. Background Technology

[0002] Friction stir deposition (AFSD) is an emerging and important solid-state additive manufacturing technology, gradually becoming a solid-state incremental additive manufacturing technique. In AFSD, a non-consumable, hollow, rotating tool is used, and a feedstock is delivered via a feeding device. The tool and feedstock rotate synchronously at high speed, generating dynamic contact friction and extrusion upon contact, causing the feedstock to rapidly heat up and plasticize. Under the shear force of the tool and the forging force of the feeding device, the plasticized feedstock is extruded and filled into the gap between the tool head and the substrate, forming a deposited layer. As the tool head moves, the deposited layer accumulates layer by layer, eventually forming the desired geometry.

[0003] However, in related technologies, automatic feeding devices can achieve continuous feeding of bars of the same size, but the gaps between bars can affect the stability of deposition, and can only feed bars of the same size, making it difficult to achieve continuous feeding of large parts for additive manufacturing. Utility Model Content

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the purpose of this invention is to propose a continuous friction stir deposition additive manufacturing apparatus. This apparatus achieves continuous feeding during the friction stir deposition additive manufacturing process by employing a melting-then-solidification method. The raw materials are unrestricted, and after melting, they solidify into continuous rod-shaped solids. A driving device continuously feeds the solidified rods, eliminating seams and enabling continuous friction stir deposition additive manufacturing of large-sized parts.

[0005] To achieve the above objectives, this utility model proposes a friction stir continuous additive manufacturing apparatus, comprising: a rotatable spindle, the spindle having an internal feeding channel suitable for the passage of additive raw materials, the feeding channel including, from top to bottom, a feeding zone, a melting zone, a solid-liquid phase mixing zone, and a solid phase zone; a welding fixture, fixedly connected to the spindle, the interior of the welding fixture communicating with the feeding channel; and a heating device, correspondingly arranged with the melting zone of the feeding channel, used to heat and melt the additive raw materials supplied by the feeding zone, so that the melted additive raw materials are subjected to gravity. Additive raw materials flow into the solid-liquid phase mixing zone to form a solid-liquid phase mixed state; a liquid cooling device is correspondingly set in the solid phase zone of the feeding channel to cool the additive raw materials flowing in from the solid-liquid phase mixing zone to form an additive raw material rod of a preset shape; a driving device is set in the solid phase zone to receive the additive raw material rod in the solid phase zone and continuously drive the additive raw material rod to move along the axial direction of the feeding channel in the feeding channel, so that the additive raw material rod is subjected to friction deposition on the additive substrate by a welding tool.

[0006] In addition, the above-described friction stir continuous additive manufacturing apparatus according to this utility model may also have the following additional technical features:

[0007] Furthermore, the spindle and the welding fixture are coaxially arranged, and the spindle and the welding fixture rotate coaxially around the axis of the spindle. One end of the welding fixture forms a frictional heat-generating surface that is close to the additive substrate during the deposition of additive materials.

[0008] Furthermore, the heating device includes a heating coil wound around the circumferential surface of the spindle, and the heating coil includes at least one of a resistance heating coil, an induction heating coil, an arc heating coil, an electron beam heating coil, and an infrared heating coil.

[0009] Furthermore, the liquid cooling device includes a liquid cooling channel disposed on the circumferential surface of the spindle, with a coolant inlet located near the upper part of the spindle and a coolant outlet located near the lower part of the spindle.

[0010] Specifically, the driving device includes at least two driving rollers, which are symmetrically arranged, and the at least two driving rollers drive the additive raw material bar to move along the axial direction of the feeding channel within the feeding channel.

[0011] Furthermore, additive materials include at least one or more of rod additive materials, filament additive materials, particle additive materials, or powder additive materials.

[0012] Furthermore, the shape of the additive raw material bar is matched with the feeding channel.

[0013] Specifically, the additive manufacturing material rod is a square rod.

[0014] Furthermore, an auxiliary force-applying mechanism is provided at the corresponding position in the feeding zone. The auxiliary force-applying mechanism is used to push the additive raw material in the feeding zone to the melting zone.

[0015] Furthermore, a raw material protection zone is set up above the feeding area. The raw material protection zone is filled with inert gas to isolate the additive raw materials entering the feeding channel from the atmospheric environment.

[0016] The friction stir continuous additive manufacturing apparatus according to this utility model includes: a rotatable spindle, the spindle having a feeding channel inside suitable for the passage of additive raw materials, the feeding channel including, from top to bottom, a feeding zone, a melting zone, a solid-liquid phase mixing zone, and a solid phase zone; a welding fixture, fixedly connected to the spindle, the interior of the welding fixture communicating with the feeding channel; and a heating device, correspondingly arranged with the melting zone of the feeding channel, for heating and melting the additive raw materials supplied by the feeding zone, so that the melted additive raw materials flow into the solid-liquid phase under the action of gravity. The mixing zone forms an additive raw material in a solid-liquid mixed state. A liquid cooling device, corresponding to the solid phase zone of the feeding channel, cools the additive raw material flowing in from the mixing zone to form an additive raw material rod of a preset shape. A driving device, located in the solid phase zone, receives the additive raw material rod and continuously drives it along the axis of the feeding channel, allowing the rod to undergo friction stir deposition on the additive substrate via a welding tool. Thus, this device achieves continuous feeding during friction stir deposition additive manufacturing by employing a melting-then-solidification method. The raw material is unrestricted; after melting, it solidifies into continuous rod-shaped solids. The driving device continuously feeds these solidified rods without seams, enabling continuous friction stir deposition additive manufacturing of large-sized parts.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of a stir friction continuous additive manufacturing apparatus according to some embodiments of the present invention;

[0019] Figure 2 This is a flowchart of a control method for a stir friction continuous additive manufacturing apparatus according to some embodiments of the present invention.

[0020] Explanation of reference numerals in the attached figures

[0021] 100-Continuous additive manufacturing apparatus with friction stirring, 70-spindle, 61-welding tool, 31-heating device, 51-liquid cooling device, 52-drive device, 10-protection zone, 20-feeding zone, 30-melting zone, 40-solid-liquid phase mixing zone, 50-solid phase zone, 80-additive substrate, 90-worktable, 81-first layer additive body, 82-second layer additive body. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in the embodiments of this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] As described in the background section, friction stir deposition (FSD) is an emerging and important solid-state additive manufacturing technology, gradually becoming a solid-state incremental additive manufacturing technology. In FSD, a non-consumable, hollow, rotating tool is used, and a feed material (such as a metal rod) is delivered via a feeding device. The tool and the feed material rotate synchronously at high speed, generating dynamic contact friction and extrusion upon contact, causing the feed material to rapidly heat up and plasticize. Under the shearing force of the tool and the forging force of the feeding device, the plasticized feed material is extruded and filled into the gap between the tool head and the substrate, forming a deposition layer. As the tool head moves, the deposition layer accumulates layer by layer, eventually forming the desired geometry.

[0025] In the process of realizing this utility model, the applicant discovered that in related technologies, automatic feeding devices can achieve continuous feeding of bars of the same size. However, the gaps between the bars can affect the stability of the deposition, and only bars of the same size can be fed, making it difficult to achieve continuous feeding of large parts for additive manufacturing.

[0026] Therefore, this utility model achieves continuous feeding in the friction stir deposition additive manufacturing process by adopting a method of melting first and then solidifying. The raw materials are not limited, and after the raw materials are melted, they are all solidified into continuous rod-shaped solids. The solidified continuous rods are continuously fed by the driving device, without any joint gaps, thus realizing continuous friction stir deposition additive manufacturing of large-sized parts.

[0027] The friction stir continuous additive manufacturing apparatus proposed in the embodiments of this utility model is described below with reference to the accompanying drawings.

[0028] refer to Figure 1 This is a cross-sectional schematic diagram of a stir friction continuous additive manufacturing apparatus according to some embodiments of the present invention.

[0029] The friction stir continuous additive manufacturing apparatus 100 of this invention includes a rotatable spindle 70, a welding fixture 61, a heating device 31, a liquid cooling device 51, and a drive device 52.

[0030] The spindle 70 has a feeding channel inside that is suitable for the passage of additive raw materials. The feeding channel includes, from top to bottom, a feeding area 20, a melting area 30, a solid-liquid phase mixing area 40, and a solid phase area 50. The rotation of the spindle 70 not only provides power for stirring friction deposition, but also realizes the continuous transport of additive raw materials through the feeding channel.

[0031] Above the feeding area 20, there is a raw material protection area 10, which is a protective gas filling area. The protective gas is an inert gas. By filling the protective gas here, the additive raw materials entering the feeding channel are isolated from the atmospheric environment to ensure that the additive raw materials are not contaminated after melting.

[0032] Specifically, a raw material protection zone 10 is specially set up above the feeding area 20. This area is isolated from the external atmosphere by a sealed structure to ensure that the additive raw materials entering the feeding channel are not contaminated by harmful substances such as oxygen and moisture in the air. To achieve this goal, the raw material protection zone 10 is filled with inert gases, such as argon or nitrogen. These inert gases are chemically stable and do not easily react with other substances, thus effectively protecting the purity of the additive raw materials. In particular, the inert gas can isolate oxygen in the air, thereby preventing oxidation reactions of the additive raw materials during processing and ensuring the quality and performance of the additive products; by filling with inert gas, the entry of dust, moisture and other impurities in the air into the feeding channel can be reduced, further ensuring the purity of the additive raw materials.

[0033] The feeding zone 20 is used for feeding additive raw materials; the melting zone 30 is used to melt the additive raw materials passing through the feeding zone 20 into liquid metal under the heating action of the heating device 31; the solid-liquid phase mixing zone 40 is used to move the liquid metal away from the heating device 31 under the action of gravity to form a solid-liquid mixture; the solid phase zone 50 is used to further cool and solidify the metal in the solid-liquid phase mixing zone 40 into a solid under the action of the liquid cooling device 51.

[0034] The welding fixture 61 is fixedly connected to the spindle 70 at one end near the spindle 70. The interior of the welding fixture 61 is connected to the feeding channel so that the additive raw material can be agitated and deposited on the additive substrate 80 through the spindle 70 and the welding fixture 61. The welding fixture 61 and the spindle 70 can be connected by studs, welding, riveting or bonding.

[0035] Optionally, the spindle 70 and the welding fixture 61 are coaxially arranged, with the welding fixture 61 positioned below the spindle 70 (see reference). Figure 1 The spindle 70 and the welding fixture 61 rotate coaxially around the axis of the spindle 70. That is, the welding fixture 61 rotates under the drive of the spindle 70. The end of the welding fixture 61 that is not close to the spindle 70 forms a frictional heat-generating surface that is close to the additive substrate 80 during the deposition of additive materials, so as to complete the deposition of additive raw materials.

[0036] The heating device 31 is disposed on the circumferential surface of the main shaft 70, that is, the heating device 31 surrounds the surface of the main shaft 70. The heating device 31 corresponds to the melting zone 30 of the feeding channel. The heating device 31 is used to heat and melt the additive raw material supplied by the feeding zone 20, so that the additive raw material is melted into liquid metal, so that the melted additive raw material flows into the solid-liquid phase mixing zone 40 under the action of gravity to form an additive raw material in a solid-liquid phase mixed state.

[0037] Optionally, the heating device 31 includes a heating coil wound around the circumferential surface of the spindle 70. The number of heating coils can be set according to the diameter of the spindle 70, working conditions, etc. The heating coil includes at least one of resistance heating coil, induction heating coil, electric arc heating coil, electron beam heating coil, and infrared heating coil.

[0038] Among them, resistance heating coils utilize the Joule effect of electric current to convert electrical energy into heat energy. They are divided into direct resistance heating and indirect resistance heating, and are characterized by simple structure, convenient operation, and high thermal efficiency. Induction heating coils utilize the induced current (eddy current) generated in a conductor under an alternating electromagnetic field to generate heat. They are characterized by high heating efficiency, rapid heating, and the ability to heat metals either as a whole or in a localized manner. Arc heating coils utilize the high temperature generated by an electric arc to heat objects. An electric arc is a gas discharge phenomenon between two electrodes. They are characterized by high arc temperature, concentrated energy, and suitability for high-temperature melting. Electron beam heating coils utilize the heat energy generated by electron beam bombardment of materials under vacuum conditions. They are characterized by highly concentrated heating power, extremely high power density, high heating precision, and minimal material contamination under vacuum conditions. Infrared heating coils utilize infrared radiation to heat objects. After the objects absorb the infrared radiation, it is converted into heat energy. They are characterized by fast heating speed, selective radiation, significant energy-saving effect, and no environmental pollution.

[0039] The liquid cooling device 51 is disposed on the circumferential surface of the main shaft 70, that is, the liquid cooling device 51 surrounds the surface of the main shaft 70. The liquid cooling device 51 corresponds to the solid phase zone 50 of the feeding channel. The liquid cooling device 51 is used to cool the additive raw material in a solid-liquid mixed state that flows in from the solid-liquid mixed zone 40, so that the additive raw material in a solid mixed state condenses into a solid to form an additive raw material rod of a preset shape. The solidified additive raw material rod is continuous and has no gaps, which can realize a continuous and stable stirring friction deposition additive process.

[0040] Optionally, the liquid cooling device 51 includes a liquid cooling channel disposed on the circumferential surface of the spindle 70. The liquid cooling channel is provided with a coolant inlet near the upper part of the spindle 70 and a coolant outlet near the lower part of the spindle 70, so that the coolant enters from the coolant inlet to cool the additive raw material in a solid-liquid phase mixed state flowing in from the solid-liquid phase mixing zone 40. After cooling is completed, the coolant flows out from the coolant outlet.

[0041] The driving device 52 is located in the solid phase region 50. The driving device 52 contacts the additive raw material rod in the solid phase region 50 and continuously drives the additive raw material rod to move along the axial direction of the feeding channel in the feeding channel. Under the action of the driving device 52, the additive raw material rod moves downward and the additive raw material rod is subjected to friction stirring deposition on the additive substrate 80 through the welding tool 61.

[0042] Optionally, the drive unit 52 includes at least two drive rollers, which can be selected as geared or toothless wheels. When toothless wheels are selected, the surface of the wheel has an anti-slip layer.

[0043] In some embodiments, when the drive roller is selected with a gear, it is a drive gear. At least two drive gears are symmetrically arranged, and the driving directions of two adjacent drive gears are opposite. At least two drive gears drive the additive raw material bar to move along the axial direction of the feeding channel within the feeding channel.

[0044] Optionally, the driving capability of the drive roller can be improved by adding serrations to the surface of the drive roller.

[0045] Additive materials include at least one or more of bar additive materials, wire additive materials, granular additive materials, or powder additive materials. Regardless of the form of the additive material, the additive material will be melted into liquid metal in the melting zone 30 under the heating action of the heating device 31.

[0046] Any metal / element can be added to the additive raw material to achieve the preparation of transition / composite materials.

[0047] Since the reshaping of the additive raw material after melting (i.e., the process of condensing the melted additive raw material into an additive raw material rod) takes place within the feeding channel, the processing of the additive raw material in the entire feeding channel is: solid-melt-reshaping. The shape of the additive raw material rod needs to match the feeding channel so that the additive raw material rod can pass through the feeding channel smoothly. That is, if the feeding channel is cylindrical, the shape of the additive raw material rod is round; if the feeding channel is square, the shape of the additive raw material rod is square.

[0048] In some cases, the additive raw material may not be able to sink smoothly or the sinking rate may be very slow. In this case, an auxiliary force-adding mechanism can be set at the corresponding position in the feeding zone 20. The auxiliary force-adding mechanism can be used to push the additive raw material in the feeding zone 20 to the melting zone 30 to prevent the additive raw material from failing to fall normally or falling slowly under the action of gravity alone.

[0049] The additive substrate 80 is mounted on the worktable 90. The friction stir continuous additive manufacturing apparatus 100 of this invention also includes a moving mechanism. In order to ensure that the additive raw material can be deposited on the additive substrate 80 according to a predetermined trajectory and speed, a mechanism that can precisely control the moving direction of the spindle 70 is required, namely the moving mechanism. The moving mechanism is connected to the spindle 70 and is used to drive the spindle 70 to move along the target additive direction. The moving direction of the moving mechanism is consistent with the target additive direction so as to perform friction stir deposition of additives on the additive substrate 80. A first layer of additive body 81 and a second layer of additive body 82 can be obtained on the additive substrate 80. By precisely controlling the moving direction and speed of the spindle 70, precise control and high-efficiency manufacturing of additives are achieved.

[0050] As a specific embodiment, refer to Figure 2 This is a flowchart of a control method for a stir friction continuous additive manufacturing apparatus according to some embodiments of the present invention.

[0051] like Figure 2 As shown, the control method of the friction stir continuous additive manufacturing apparatus of this utility model embodiment may include the following steps:

[0052] S201, Preprocessing.

[0053] In this step, the spindle is rotated to open the protection zone, heating device, and liquid cooling device.

[0054] S202, feeding, the feeding area where additive manufacturing materials enter through the feeding channel.

[0055] S203, the additive raw materials in the feeding zone are melted into liquid metal under the heating action of the heating device.

[0056] S204, the molten liquid metal flows downwards under the influence of gravity, away from the heating device.

[0057] In this step, the molten liquid metal gradually cools down, forming a solid-liquid mixture.

[0058] S205, cooling additive materials in a solid-liquid mixed state that flow in from the solid-liquid phase mixing zone.

[0059] In this step, the metal in the solid-liquid phase mixing zone is cooled and solidified into a solid by the liquid cooling device.

[0060] S206 drives the additive raw material bar to move along the axis of the feeding channel within the feeding channel.

[0061] In this step, the additive raw material bar moves downward under the action of the drive device.

[0062] S207, forming additive parts.

[0063] In summary, the friction stir continuous additive manufacturing apparatus of this utility model includes: a rotatable spindle, the spindle having a feeding channel inside suitable for the passage of additive raw materials, the feeding channel including, from top to bottom, a feeding zone, a melting zone, a solid-liquid phase mixing zone, and a solid phase zone; a welding fixture, fixedly connected to the spindle, the interior of the welding fixture communicating with the feeding channel; and a heating device, correspondingly arranged with the melting zone of the feeding channel, used to heat and melt the additive raw materials supplied by the feeding zone, so that the melted additive raw materials flow under the action of gravity. The additive manufacturing process involves several steps: First, a solid-liquid phase mixing zone is formed to create a solid-liquid phase mixture of additive raw materials. A liquid cooling device, corresponding to the solid phase zone of the feeding channel, cools the additive raw materials flowing in from the solid-liquid phase mixing zone, forming additive raw material rods of a predetermined shape. A driving device, located in the solid phase zone, receives the additive raw material rods and continuously drives them along the axis of the feeding channel, allowing them to be subjected to friction stir deposition on the additive substrate via a welding tool. This device achieves continuous feeding during friction stir deposition additive manufacturing by employing a melting-then-solidification method. The raw materials are unrestricted; after melting, they solidify into continuous rod-shaped solids. The driving device enables continuous feeding of these solidified rods without seams, allowing for continuous friction stir deposition additive manufacturing of large-sized parts.

[0064] It should be noted that the above description describes some embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0065] Furthermore, although the operation of the method of this invention is described in a specific order in the accompanying drawings, this does not require or imply that the operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. On the contrary, the steps depicted in the flowchart may be executed in a different order. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0066] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in the embodiments of this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0067] While the spirit and principles of this invention have been described with reference to several specific embodiments, it should be understood that this invention is not limited to the disclosed specific embodiments, and the division of aspects does not imply that features in these aspects cannot be combined for benefit; such division is merely for ease of description. This invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the appended claims is to be interpreted in the broadest sense, thereby encompassing all such modifications and equivalent structures and functions.

Claims

1. A continuous additive manufacturing apparatus for friction stirring, characterized in that, include: A rotatable spindle (70) is provided inside the spindle (70) with a feeding channel suitable for the passage of additive raw materials. The feeding channel includes, from top to bottom, a feeding area (20), a melting area (30), a solid-liquid phase mixing area (40), and a solid phase area (50). Welding fixture (61) is fixedly connected to the spindle (70), and the interior of the welding fixture (61) is connected to the feeding channel; Heating device (31), which is correspondingly provided with the melting zone (30) of the feeding channel, is used to heat and melt the additive raw material supplied by the feeding zone (20) so that the melted additive raw material flows into the solid-liquid phase mixing zone (40) under the action of gravity to form an additive raw material in a solid-liquid phase mixed state; Liquid cooling device (51) is provided in accordance with the solid phase zone (50) of the feeding channel to cool the additive raw material in a solid-liquid mixed state that flows in from the solid-liquid phase mixing zone (40) to form an additive raw material rod of a preset shape. A driving device (52) is disposed in the solid phase region (50) for receiving the additive raw material rod in the solid phase region (50) and continuously driving the additive raw material rod to move along the axial direction of the feeding channel in the feeding channel, so that the additive raw material rod is subjected to friction stir deposition on the additive substrate (80) by a welding tool (61).

2. The friction stir continuous additive manufacturing apparatus according to claim 1, characterized in that, The spindle (70) and the welding fixture (61) are coaxially arranged. The spindle (70) and the welding fixture (61) rotate coaxially around the axis of the spindle (70). One end of the welding fixture (61) forms a friction heat-generating surface that is close to the additive substrate (80) during the deposition of additive materials.

3. The friction stir continuous additive manufacturing apparatus according to claim 1, characterized in that, The heating device (31) includes a heating coil wound around the circumferential surface of the main shaft (70), and the heating coil includes at least one of a resistance heating coil, an induction heating coil, an arc heating coil, an electron beam heating coil, and an infrared heating coil.

4. The friction stir continuous additive manufacturing apparatus according to claim 1, characterized in that, The liquid cooling device (51) includes a liquid cooling channel disposed on the circumferential surface of the spindle (70), a coolant inlet is disposed near the upper part of the spindle (70), and a coolant outlet is disposed near the lower part of the spindle (70).

5. The friction stir continuous additive manufacturing apparatus according to claim 1, characterized in that, The driving device (52) includes at least two driving rollers, which are symmetrically arranged and drive the additive raw material bar to move along the axial direction of the feeding channel within the feeding channel.

6. The friction stir continuous additive manufacturing apparatus according to claim 1, characterized in that, The additive materials include at least one or more of the following: rod additive materials, wire additive materials, particulate additive materials, or powder additive materials.

7. The friction stir continuous additive manufacturing apparatus according to claim 1, characterized in that, The shape of the additive raw material bar is matched with the feeding channel.

8. The friction stir continuous additive manufacturing apparatus according to claim 7, characterized in that, The additive manufacturing material rod is a square rod.

9. The friction stir continuous additive manufacturing apparatus according to claim 1, characterized in that, An auxiliary force-applying mechanism is provided at a corresponding position in the feeding zone (20), which is used to push the additive raw material in the feeding zone (20) to the melting zone (30).

10. The friction stir continuous additive manufacturing apparatus according to claim 1, characterized in that, The upper layer of the feeding area (20) is provided with a raw material protection area (10), which is filled with inert gas to isolate the additive raw materials entering the feeding channel from the atmospheric environment.

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