Bar friction stir welding additive manufacturing device and additive manufacturing method

Abstract

The invention discloses a bar friction stir welding additive manufacturing device and an additive manufacturing method. The bar friction stir welding additive manufacturing device comprises a sleeve lifting unit and a friction additive unit which are arranged on a Z-axis driving module. The friction material adding unit comprises a switching cutter handle, a bar, a sleeve, a rotary clamping sleeve and a lifting support, the head of the bar is clamped on the switching cutter handle, and the tail end of the bar is sleeved with the sleeve. The outer portion of the rotary clamping sleeve is fixedly connected with the lifting support, a rolling body is arranged in the rotary clamping sleeve, and the limiting clamping spring enables the sleeve arranged in the limiting clamping spring in a sleeved mode to freely rotate around the axis of the bar. The lifting support is fixedly connected with the sleeve lifting unit, the lifting value delta Z is kept from the lower surface of the sleeve to the tail end of the bar through lifting of the sleeve, and a softened material of the bar is stacked on an additive manufacturing path with the fixed layer thickness delta Z. The solid-phase additive manufacturing technology for bar friction stir welding can be compatible with repair or additive manufacturing of large-size and complex-shape parts, and has the advantages of being high in welding bead forming precision, refined in structure grain, high in manufacturing efficiency and the like.

Description

Technical Field

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

[0002] Additive manufacturing technology is an emerging manufacturing technology that uses digital models as a basis and stacks materials layer by layer to create physical objects. It embodies the close integration of information network technology with advanced materials technology and digital manufacturing technology, and is an important part of the advanced manufacturing industry. Currently, additive manufacturing mostly uses fusion welding technology, such as arc additive, laser additive, and electron beam additive. That is, high-energy heat sources are used to make the working temperature of the material higher than the melting point. It has the advantages of high welding efficiency and high material utilization. However, the above technologies are prone to problems such as pores, cracks, and coarse grains during the additive manufacturing process, which reduce the performance of additively manufactured parts. Rod friction stir welding additive technology uses the friction between the rod and the part to generate heat and stir the rod to plasticize and flow, and then stack it layer by layer to form a dense additive part. The solid-phase additive technology used is free of defects such as pores and cracks, and has the advantages of small thermal deformation and refined grains.

[0003] Chinese Patent 201510955775.9, "A Method for Additive Manufacturing Rods by Friction Stir Welding," welds a mold to a substrate, then uses friction stir welding to stack rods layer by layer within the mold to produce friction stir welded additive parts. However, this invention is limited to additive manufacturing within the mold space. The rod ends are subject to the risk of jitter and weld curling during friction plasticization, resulting in a rough weld surface and a lack of effective control over weld layer thickness, limiting the invention's application and promotion in actual manufacturing. Therefore, achieving high-efficiency, high-quality, and complex parts through friction stir welding of rods has become a research focus in this field. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to provide a rod stir friction welding additive manufacturing device and method, and to provide an efficient rod stir friction welding additive manufacturing technology that can adapt to variable layer thickness and complex shapes, so as to solve the problems of curling, low efficiency and poor forming accuracy existing in traditional technologies.

[0005] The present invention provides the following technical solution: a bar friction stir welding additive manufacturing device, comprising: a friction stir welding machine, the friction stir welding machine being provided with a gantry, a base, and an additive manufacturing platform, the gantry being provided with a Y-axis drive module, the Y-axis drive module being connected to a Z-axis drive module; the base being provided below the gantry, the base being provided with an X-axis drive module above the base, the additive manufacturing platform being connected to the X-axis drive module; the Z-axis drive module being provided with a sleeve lifting unit and a friction additive unit;

[0006] The friction material-adding unit includes an adapter handle, a rod, a sleeve, a rotating jacket, and a lifting bracket. The head of the rod is a clamping end and is clamped and fixed by the adapter handle. The sleeve body is a hollow cylindrical structure and is sleeved on the end of the rod. The sleeve is sleeved in the rotating jacket, and a rolling body and a limit spring are provided in the rotating jacket, so that the sleeve can freely rotate around the axis of the rod in the rotating jacket. The lower end of the lifting bracket is fixed to the rotating jacket, and the upper end of the lifting bracket is fixed to the sleeve lifting unit. The sleeve lifting unit is used to drive the sleeve to move axially relative to the rod.

[0007] The lower bottom surface of the sleeve is provided with a lift-off value ΔZ relative to the end of the rod.

[0008] Furthermore, the sleeve is made of cemented carbide.

[0009] Furthermore, the rod head is provided with a cut surface for clamping and fixing, and the adapter handle is provided with a rod fixing screw for pressing the cut surface of the rod head.

[0010] Furthermore, the sleeve lifting unit includes a first guide mechanism fixed on one side of the Z-axis drive module body, the first guide mechanism is provided with a slider and a first lifting side plate is fixed on the slider, and a first lifting rack is fixed at the front end of the first lifting side plate; at the same time, a second guide mechanism, a second lifting plate, and a second lifting rack are provided in the same manner on the other side of the Z-axis drive module body; the sleeve lifting unit includes a driving motor and a lifting driving main shaft, and the driving motor transmits the torque to the lifting driving main shaft through the provided bevel gear transmission pair; the lifting driving main shaft is mounted on the bearing seat and the front end face of the Z-axis drive module body is fixed by the bearing seat; a first driving spur gear and a second driving spur gear are also provided at both ends of the lifting driving main shaft, which are respectively meshed with the first lifting rack and the second lifting rack, so that the first lifting side plate and the second lifting side plate perform synchronous lifting movements; the first lifting side plate and the second lifting side plate are fixed to both sides of the upper end of the lifting bracket.

[0011] Furthermore, the additive manufacturing platform is provided with a base plate and a base plate fixture, the base plate is used to support the additive parts, and the base plate is fixed on the additive manufacturing platform by the base plate fixture.

[0012] Furthermore, the rolling body includes an upper bearing and a lower bearing, the upper end of the upper bearing is provided with an upper bearing limit spring, and the lower end of the lower bearing is provided with a lower bearing limit spring; the rotating jacket also includes a jacket body, and the upper bearing and the lower bearing are connected through the jacket body; the jacket body is connected to the lifting bracket.

[0013] In a second aspect, the present invention provides an additive manufacturing method for the above-mentioned rod friction stir welding additive manufacturing device, comprising the following steps:

[0014] S1. Obtain the nominal 3D model of the part to be added and determine the additive manufacturing process parameters: layer thickness Δh, weld width B weld , welding speed V weld , bar feed speed F1;

[0015] S2. performing layered slicing processing on the three-dimensional model and generating an additive manufacturing path code;

[0016] S2. Select the rod diameter Φ=B weld , clean and pre-treat the surface of the rod, then clamp it to the adapter tool holder; clean and pre-treat the base plate made of the same material as the rod, then fix it on the additive manufacturing platform with a base plate fixture;

[0017] S4. Get the total number of model slice layers N max , initialize the current layer N=1;

[0018] S3, read the additive manufacturing code of the Nth layer, set the sleeve lift-off value ΔZ equal to the layer thickness Δh of the Nth layer, the sleeve lifting speed F2=F1, and the spindle rotation speed n;

[0019] S4, start the equipment and execute the additive manufacturing task of the current layer; the rod starts to rotate and move along the additive manufacturing path at the starting position, and at the same time the rod is fed axially to realize the feeding additive; under the constraint of the sleeve, the softened material at the end of the rod forms a thickness of Δh and a width of B on the additive path. weld Additive stacking;

[0020] S5: Complete the Nth layer of additive manufacturing task and determine whether N is greater than N max ; If N<N max , then N=N+1 and jump to step S3; if N≥N max , then jump to the next step;

[0021] S6. Complete all additive manufacturing tasks.

[0022] The bar feeding speed F1 is achieved by the spindle pressing speed of the friction stir welding machine, and the bar feeding speed F1 is:

[0023] .

[0024] The present invention has at least the following beneficial effects:

[0025] (1) The present invention adds a freely rotatable carbide sleeve to the end of the bar to improve the rigidity of the bar end and the additive manufacturing accuracy. The bottom of the sleeve is set with a specific lift-off value ΔZ relative to the end of the bar, which effectively controls the layer height accuracy of the deposited weld, avoids the weld curling problem common in traditional bar additive manufacturing, and realizes shape-controlled and property-controlled manufacturing of parts.

[0026] (2) A sleeve lifting unit is provided on the Z drive module of the friction stir welding machine, which can accurately control the lifting value ΔZ and meet the requirements of variable edge layer thickness additive manufacturing such as complex parts and surface defect repair.

[0027] (3) The friction additive unit and sleeve lifting unit proposed in the present invention are arranged on the Z-axis drive module of the friction stir welding machine, which is compatible with the additive manufacturing of large-sized components and has the advantages of a large additive manufacturing range, simple programming and high efficiency.

[0028] (4) The present invention is a solid-phase additive manufacturing technology. During the additive manufacturing process, the temperature of the rod is lower than the melting point. Compared with the traditional molten metal additive manufacturing, the present invention has the significant advantages of fine grain structure, low heat input, high and stable molding quality. The mechanical properties of the additively manufactured parts are close to those of the parent material. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a friction stir welding additive manufacturing device;

[0030] Figure 2 It is a schematic diagram of the structure of the sleeve lifting unit and the friction stir additive unit;

[0031] Figure 3 for Figure 2 Partial view A';

[0032] Figure 4 It is a front view and a cross-sectional view of the sleeve lifting unit and the friction stir additive unit;

[0033] Figure 5 for Figure 4 Partial view B';

[0034] Figure 6 This is a schematic diagram of bar clamping;

[0035] Figure 7 Schematic diagram of the additive manufacturing process for friction stir welding of rods;

[0036] Figure 8 Schematic diagram of the additive path code for friction stir welding of rods;

[0037] Reference numerals:

[0038] 1. Friction stir welding machine; 11. Z-axis drive module; 12. Gantry; 13. Additive manufacturing platform; 131. Base plate; 132. Base plate fixture; 133. Additive parts; 14. Base; 15. X-axis drive module; 16. Y-axis drive module; 2. Sleeve lifting unit; 211. First lifting rack; 212. Second lifting rack; 22. Servo motor; 23. Bearing seat; 24. Bevel gear transmission pair; 251. First lifting spur gear; 252. Second lifting spur gear; 26. Lifting drive main Shaft; 271, first lifting side plate; 272, second lifting side plate; 281, first guide mechanism; 282, second guide mechanism; 3, friction additive unit; 31, adapter handle; 311, rod fixing screw; 32, lifting bracket; 33, rod; 331, rod clamping section; 332, rod additive consumption section; 34, rotating jacket; 341, jacket body; 3421, upper bearing limit spring; 3422, lower bearing limit spring; 3431, upper bearing; 3432, lower bearing; 35, sleeve. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0040] Example 1, as Figures 1-6 As shown, this embodiment provides a bar friction stir welding additive manufacturing device, including a friction stir welding machine 1, a sleeve lifting unit 2, and a friction additive unit 3. The friction stir welding machine 1 includes a base 14 and a gantry 12 fixed above the base 14. The Y-axis drive module 16 is fixed to the crossbeam of the welding machine gantry 12 and is used to drive the Z-axis drive module 11 set on the Y-axis drive module 16 to perform Y-axis translation. The base 14 is also provided with an X-axis drive module 15 and an additive manufacturing platform 13. The X-axis drive module 15 is used to drive the additive manufacturing platform 13 to perform X-axis translation. The additive manufacturing platform 13 is provided with a base plate 131 and a base plate clamp 132. The base plate 131 is fixed to the additive manufacturing platform 13 by the base plate clamp 132.

[0041] The main body of the Z-axis drive module 11 is a rectangular parallelepiped, equipped with a sleeve lifting unit 2 and a friction-adding unit 3. The friction-adding unit 3 comprises, from top to bottom, an adapter handle 31, a rod 33, and a sleeve 35. The adapter handle 31 is provided with downward pressure and rotational torque by the Z-axis drive module 11. The head of the rod 33 is machined with a cutting plane, forming a rod clamping section 331. A rod fixing screw 311 secures the rod clamping section 331 to the adapter handle 31. The middle portion of the rod 33 is the rod-consumable section 332. The sleeve 35, a hollow cylindrical structure made of cemented carbide (tungsten-cobalt, tungsten-rhenium, tungsten-nickel, etc.), fits over the end of the rod 33. The sleeve 35 fits within a rotating jacket 34, which includes an upper bearing 3431 and a lower bearing 3432, connected to the jacket body 341. These bearings allow the sleeve 35 to rotate freely. Two retaining spring grooves are provided in the sleeve 35, which are axially secured within the rotating jacket 34 by upper and lower bearing retaining springs 3421 and 3422. The lower end of the lifting bracket 32 is bolted to the rotating jacket 34. The upper end of the lifting bracket 32 is secured to the lower ends of the first and second lifting side plates 271 and 272, respectively.

[0042] The first guide mechanism 281 of the sleeve lifting unit 2 comprises two sets of dual-slider linear guides, fixed to one side of the main body of the Z-axis drive module 11. A first lifting side plate 271 is fixed to the slider of the first guide mechanism 281 for Z-axis lifting displacement. The front end of the first lifting side plate 271 is mounted with a first lifting rack 211. The other side of the main body of the Z-axis drive module 11 is similarly provided with a second guide mechanism 282, a second lifting side plate 272, and a second lifting rack 211. The sleeve lifting unit 2 includes a drive motor 22 and a lifting drive spindle 26. The drive motor 22 is a servo motor with a reducer, and transmits torque to the lifting drive spindle 26 via a provided bevel gear transmission pair 24. The lifting drive spindle 26 is mounted on a bearing seat 23, which is fixed to the front end of the main body of the Z-axis drive module. A first driving spur gear 251 and a second driving spur gear 252 are also provided at both ends of the lifting drive main shaft 26, which are respectively engaged with the first lifting rack 211 and the second lifting rack 212, so that the first lifting side plate 271 and the second lifting side plate 272 drive the lifting bracket 32, the rotating jacket 34, and the sleeve 35 to perform synchronous lifting movements.

[0043] Example 2, as Figure 7 and Figure 8 As shown, this embodiment provides an additive manufacturing method based on the rod friction stir welding additive manufacturing device described in Example 1, comprising the following steps:

[0044] S1. Obtain the nominal 3D model of the part to be added and determine the additive manufacturing process parameters: layer thickness Δh, weld width B weld , welding speed V weld , bar feed speed F1;

[0045] S2. performing layered slicing processing on the three-dimensional model and generating an additive manufacturing path code;

[0046] S2. Select the rod diameter Φ=B weld , clean and pre-treat the surface of the rod, then clamp it to the adapter tool holder; clean and pre-treat the base plate made of the same material as the rod, then fix it on the additive manufacturing platform with a base plate fixture;

[0047] S4. Get the total number of model slice layers N max , initialize the current layer N=1;

[0048] S3, read the additive manufacturing code of the Nth layer, set the sleeve lift-off value ΔZ equal to the layer thickness Δh of the Nth layer, the sleeve lifting speed F2=F1, and the spindle rotation speed n;

[0049] S4, start the equipment and execute the additive manufacturing task of the current layer; the rod rotates and moves along the additive manufacturing path at the starting position, and at the same time, the rod is fed axially to realize the feeding additive; under the constraint of the sleeve 35, the softened material in the area of the rod 33 lifting value ΔZ forms a thickness Δh and a width B on the additive path. weld Additive stacking;

[0050] S5: Complete the Nth layer of additive manufacturing task and determine whether N is greater than N max ; If N<N max , then N=N+1 and jump to step S3; if N≥N max , then jump to the next step;

[0051] S6. Complete all additive manufacturing tasks.

[0052] Among them, the bar feeding speed F1 is achieved by the spindle pressing speed of the friction stir welding machine, and its bar feeding speed F1 is:

[0053] .

[0054] In Example 3, the material of the part 133 to be added is aluminum alloy 6061, the dimensions are 200 mm long * 150 mm wide * 10 mm high, the wall thickness is 14 mm, and the part volume is 9.016*10 5 mm 3 For example, the steps for the additive manufacturing of the additive part 133 by friction stir welding of a rod are as follows:

[0055] S1. Obtain the nominal three-dimensional model of the part 133 to be added, and determine the additive manufacturing process parameters: layer thickness Δh=2 mm, weld width B weld =14 mm, welding speed V weld =60 mm / min, rod feed speed F1=10.92 mm / min. The nominal three-dimensional model of the additive part 133 is sliced and the total number of layers N is generated. max =5 additive manufacturing path code;

[0056] S2, select a rod 33 with a length of 400 mm and a diameter of 14 mm, made of 6061 aluminum alloy, and a section with a length of about 40 mm at the end of the rod 331. The effective additive manufacturing volume of the rod 33 is 5.6*10 5 mm 3 A single rod 33 can meet the requirements for additive manufacturing of three layers of this part. After polishing and cleaning the rod 33, it is clamped to the adapter tool holder 31. A base plate 131 made of 6061 with dimensions of 300 mm long, 300 mm wide, and 5 mm thick is selected. After polishing and cleaning the base plate 131, it is secured to the additive manufacturing platform 13 using a base plate fixture 132. The liftoff value of the sleeve 35 relative to the end of the rod 33 is set to ΔZ = Δh = 2 mm, the sleeve lift speed F2 = F1 = 10.92 mm / min, and the spindle rotation speed n = 400 rpm.

[0057] S3. Start the friction stir welding machine 1. The rod 33 rotates along the additive manufacturing path at the starting point. The rod 33 is fed axially by the adapter tool holder 31 at a speed of F1. The sleeve 35 is lifted at a speed of F2, maintaining a stable liftoff value ΔZ of 2 mm. Constrained by the sleeve 35, the softened material of the rod 33 in the liftoff value ΔZ region forms an additive deposit with a thickness of 2 mm and a width of 14 mm along the additive path.

[0058] S4. When the third layer of additive manufacturing is completed, a new rod 33 is replaced and the additive manufacturing task is continued.

[0059] S5. After the rod has completed the additive manufacturing path of all layers, the additive manufacturing task is completed.

[0060] In Example 4, a part 133 to be repaired, made of H62 brass, is used as an example. A 3D scanner is used to obtain point cloud data of the actual part surface, and a reconstructed model M1 of the surface is obtained. The original nominal model of the part 133 is M2. A Boolean operation is performed on the model to obtain the model to be repaired by additive material M3 = M2-M1. The maximum depth of the pit to be repaired is 2.85 mm, and the repair volume is 4.2*10 4 mm 3 .

[0061] S1, according to the characteristics of the model to be repaired M3, the variable thickness slice processing is performed, the first layer thickness Δh1 is 1 mm, the second layer thickness Δh2 is 1.85 mm, and the total number of layers N is generated max =2 AM path code; weld bead width B weld =6 mm, welding speed V weld =40 mm / min,. Perform layered slicing on the model M3 and generate the total number of layers N max =2 additive manufacturing path code;

[0062] S2. Select a 200 mm long, 6 mm diameter, H62 brass rod 33. Polish and clean the rod 33 before clamping it to the adapter tool holder 31. Secure the part 133 to be repaired on the additive manufacturing platform 13. Set the liftoff value ΔZ of the sleeve 35 relative to the end of the rod 33 to Δh, and the spindle speed n to 350 rpm.

[0063] S3, extract the first layer of additive manufacturing program, set the sleeve 35 lift value ΔZ = Δh1 = 1 mm, the rod feed speed F 11 =8.49 mm / min, sleeve lifting speed F2=F 11 =8.49 mm / min. Friction stir welding machine 1 is started, and rod 33 rotates along the additive manufacturing path at the starting position. Constrained by sleeve 35, H62 brass rod 33 softens in the liftoff value ΔZ region, forming an additive buildup with a thickness of 1 mm and a width of 6 mm along the additive path.

[0064] S4, extract the second layer additive manufacturing program, set the sleeve 35 lift value ΔZ = Δh2 = 1.85mm, and the rod feed speed F 12 =15.71 mm / min, sleeve lifting speed F2=F 12 =15.71 mm / min. Continue the additive manufacturing task. Once the bar has completed the second layer of the additive manufacturing path, the additive repair task is complete.

[0065] It should be noted that, in this document, relational terms such as first and second are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. Furthermore, in the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the present invention. Furthermore, in the drawings of the present invention, fill patterns are used solely to distinguish layers and do not constitute any other limitation.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bar friction stir welding additive manufacturing device, comprising: A friction stir welding machine, wherein the friction stir welding machine is provided with a gantry, a base and an additive manufacturing platform, the gantry is provided with a Y-axis drive module, and the Y-axis drive module is connected to the Z-axis drive module; The base is arranged below the gantry, an X-axis drive module is arranged above the base, and the additive manufacturing platform is connected to the X-axis drive module; it is characterized in that: a sleeve lifting unit and a friction additive unit are arranged on the Z-axis drive module; The friction material-adding unit includes an adapter handle, a rod, a sleeve, a rotating jacket, and a lifting bracket. The head of the rod is a clamping end and is clamped and fixed by the adapter handle. The sleeve body is a hollow cylindrical structure and is sleeved on the end of the rod. The sleeve is sleeved in the rotating jacket, and a rolling body and a limit spring are provided in the rotating jacket, so that the sleeve can freely rotate around the axis of the rod in the rotating jacket. The lower end of the lifting bracket is fixed to the rotating jacket, and the upper end of the lifting bracket is fixed to the sleeve lifting unit. The sleeve lifting unit is used to drive the sleeve to move axially relative to the rod. The lower bottom surface of the sleeve is provided with a lift-off value ΔZ relative to the end of the rod.

2. The bar friction stir welding additive manufacturing device according to claim 1, characterized in that: The sleeve is made of hard alloy.

3. The bar friction stir welding additive manufacturing device according to claim 1, characterized in that: The rod head is provided with a cutting surface for clamping and fixing, and the adapter handle is provided with a rod fixing top screw for pressing the cutting surface of the rod head.

4. The bar friction stir welding additive manufacturing device according to claim 1, characterized in that: The sleeve lifting unit includes a first guide mechanism fixed on one side of the Z-axis drive module body, the first guide mechanism is provided with a slider and a first lifting side plate is fixed on the slider, and a first lifting rack is fixed at the front end of the first lifting side plate; at the same time, a second guide mechanism, a second lifting plate and a second lifting rack are provided in the same manner on the other side of the Z-axis drive module body; the sleeve lifting unit includes a driving motor and a lifting driving spindle, and the driving motor transmits the torque to the lifting driving spindle through the provided bevel gear transmission pair; the lifting driving spindle is sleeved on the bearing seat and the front end surface of the Z-axis drive module body is fixed by the bearing seat; a first driving spur gear and a second driving spur gear are also provided at both ends of the lifting driving spindle, which are respectively engaged with the first lifting rack and the second lifting rack, so that the first lifting side plate and the second lifting side plate perform synchronous lifting and lowering movements; the first lifting side plate and the second lifting side plate are fixed to both sides of the upper end of the lifting bracket.

5. The rod friction stir welding additive manufacturing device according to claim 1, characterized in that: The additive manufacturing platform is provided with a base plate and a base plate fixture, wherein the base plate is used to support the additive parts; the base plate is fixed on the additive manufacturing platform by the base plate fixture.

6. The bar friction stir welding additive manufacturing device according to claim 1, characterized in that: The rolling body includes an upper bearing and a lower bearing, the upper end of the upper bearing is provided with an upper bearing limit spring, and the lower end of the lower bearing is provided with a lower bearing limit spring; the rotating jacket also includes a jacket body, and the upper bearing and the lower bearing are connected through the jacket body; the jacket body is connected to the lifting bracket.

7. The additive manufacturing method according to any one of claims 1 to 6, wherein: The steps include: S1. Obtain the nominal 3D model of the part to be added and determine the additive manufacturing process parameters: layer thickness Δh, weld width B weld , welding speed V weld , bar feed speed F1; S2. performing layered slicing processing on the three-dimensional model and generating an additive manufacturing path code; S2. Select the rod diameter Φ=B weld , clean and pre-treat the surface of the bar and then clamp it to the adapter handle; After cleaning and pre-treating the base plate made of the same material as the rod, fix it on the additive manufacturing platform with a base plate fixture; S4. Get the total number of model slice layers N max , initialize the current layer N=1; S3, read the additive manufacturing code of the Nth layer, set the sleeve lift-off value ΔZ equal to the layer thickness Δh of the Nth layer, the sleeve lifting speed F2=F1, and the spindle rotation speed n; S4, start the equipment and execute the additive manufacturing task of the current layer; the rod starts to rotate and move along the additive manufacturing path at the starting position, and at the same time, the rod is fed axially to realize the feeding additive; under the constraint of the sleeve, the softened material at the end of the rod forms a thickness of Δh and a width of B on the additive path. weld Additive stacking; S5: Complete the Nth layer of additive manufacturing task and determine whether N is greater than N max ; If N<N max , then N=N+1 and jump to step S3; if N≥N max , then jump to the next step; S6. Complete all additive manufacturing tasks.

8. The additive manufacturing method of the bar friction stir welding additive manufacturing device according to claim 7, characterized in that: The bar feeding speed F1 is achieved by the spindle pressing speed of the friction stir welding machine, and the bar feeding speed F1 is: 。

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