Additive component, friction stir deposition additive manufacturing device and method

Abstract

The invention discloses an additive component and a friction stir deposition additive manufacturing device and method.The additive component is provided with an axial direction and a feeding channel, the feeding channel penetrates through the additive component in the axial direction, a shaft shoulder side facing a base plate is formed at the end, located in the axial direction, of the additive component, and a material storage cavity is formed in the additive component; the material storage cavity is arranged around the feeding channel in the circumferential direction, communicates with the feeding channel and is adjacent to the shaft shoulder side. The material storage cavity is formed in the material adding component, high-value instantaneous shear strain is generated through friction between the rotating bar and the inner wall of the material storage cavity, and more friction and deformation heat are generated, so that the material can be thermally plasticized in the material storage cavity in advance before deposition, the flow stress of the material is reduced, and the fluidity of the material is improved; the hard high-strength material can be applied to friction stir deposition additive manufacturing, the application range of the material is expanded, metallurgical bonding of a deposition layer interface is enhanced, and component forming is optimized.

Description

Technical Field

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

[0002] In the process of friction stir deposition additive manufacturing, the feed rod can only be thermoplasticized at the place where it is directly deformed by friction with the substrate or the previous deposition layer, and the thermoplasticized area is immediately deposited on the substrate under the forging action of the shoulder, that is, the thermoplasticization and deposition of the material are carried out simultaneously. However, in the above manufacturing process, the plastic deformation ability of high-strength aluminum alloy or other hard and high-strength materials is often poor, and the material fluidity is poor in the early stage of thermoplasticization. Directly forming a deposition layer will produce weak connection defects due to insufficient material flow, resulting in poor deposition layer formation and low deposition efficiency. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide an additive component that can improve the fluidity of the initial stage of thermoplasticization of high-strength aluminum alloy or other hard and high-strength materials in the process of stir friction deposition additive manufacturing, facilitate the formation of the deposition layer, and improve the deposition efficiency.

[0004] The present invention also aims to provide a stir friction deposition additive manufacturing device to apply the above-mentioned additive components.

[0005] The present invention also aims to provide a stir friction deposition additive manufacturing method to apply the above-mentioned additive component.

[0006] According to an embodiment of the present invention, an additive component is used in a friction stir deposition additive manufacturing device, the additive component has an axial direction and a feed channel, the feed channel penetrates the additive component along the axial direction, the additive component is located at one end of the axial direction and is formed with a shoulder side facing a substrate, the additive component is provided with a storage cavity, the storage cavity is arranged around the circumference of the feed channel, is connected to the feed channel, and is adjacent to the shoulder side.

[0007] According to the additive component of the embodiment of the present invention, in the process of stir friction deposition additive manufacturing, by setting a storage cavity in the additive component, a high value of instantaneous shear strain is generated between the rod and the inner wall of the storage cavity when the rod rotates, thereby enabling the material to be thermoplasticized in the storage cavity in advance before deposition, reducing the flow stress of the material, and improving the fluidity of the material, which is conducive to the application of hard and high-strength materials in stir friction deposition additive manufacturing and can expand the scope of application of the material. Moreover, the use of the above-mentioned additive component can reduce the probability of weak connection defects caused by insufficient material flow due to better material fluidity during the deposition stage, which is conducive to strengthening the metallurgical bonding of the deposition layer interface, optimizing component forming, and improving deposition efficiency. In addition, it is also conducive to improving the stability of the additive manufacturing process of hard and high-strength materials, and meeting the high-quality and high-efficiency manufacturing requirements of large structures.

[0008] In some embodiments of the present invention, the storage cavity is an annular cavity arranged around the circumference of the feeding channel.

[0009] In some embodiments of the present invention, the material storage cavity extends in a direction close to the shaft shoulder side, and an opening is formed through the shaft shoulder side.

[0010] In some embodiments of the present invention, from the direction of the feeding channel pointing to the shaft shoulder side, the peripheral side wall of the storage cavity is inclined toward a side away from the feeding channel;

[0011] A reference surface parallel to the axial direction is provided, and an angle α is provided between the peripheral side wall of the storage cavity and the reference surface, wherein 2 degrees ≤ α ≤ 10 degrees.

[0012] In some embodiments of the present invention, a spiral groove is provided on a peripheral side wall of the material storage cavity, and the rotation direction of the spiral groove is the same as the rotation direction of the additive component.

[0013] In some embodiments of the present invention, the spiral groove is provided in a plurality along the axial direction, and the pitch between any two adjacent spiral grooves is L, wherein 0.4 mm≤L≤2 mm.

[0014] In some embodiments of the present invention, the height of the material storage cavity in the axial direction is H, wherein 2mm≤H≤8mm.

[0015] In some embodiments of the present invention, the additive component further has a radial direction perpendicular to the axial direction, and a depth of the storage cavity in the radial direction relative to the feeding channel is T, wherein 2mm≤T≤5mm.

[0016] A friction stir deposition additive manufacturing device according to an embodiment of the present invention comprises an additive component as described in any one of the above items.

[0017] The friction stir deposition additive manufacturing device according to the embodiment of the present invention can improve the fluidity of the initial stage of thermoplasticization of high-strength aluminum alloy or other hard high-strength materials during the friction stir deposition additive manufacturing process, which is beneficial to the formation of the deposition layer and improves the deposition efficiency. It is also beneficial to the application of hard high-strength materials in friction stir deposition additive manufacturing, which can expand the scope of application of the materials and improve the stability of the hard high-strength material additive manufacturing process, which is beneficial to meet the high-quality and high-efficiency manufacturing requirements of large structures.

[0018] According to an embodiment of the present invention, a friction stir deposition additive manufacturing method is provided, wherein the friction stir deposition additive manufacturing method adopts an additive component as described in any one of the foregoing items for manufacturing, and the method comprises: rotating the additive component at a preset rotation speed and stopping at a preset height position from a substrate; feeding a rod into a feeding channel of the additive component and feeding the rod along the axial direction at a preset speed so that the rod rubs against the substrate and produces thermoplastic deformation; waiting for the deposited material in the thermoplasticized area formed by the rod to fill the storage cavity; and moving the additive component along a preset path.

[0019] The stir friction deposition additive manufacturing method provided by the embodiment of the present invention can improve the fluidity of the initial stage of thermoplasticization of high-strength aluminum alloy or other hard high-strength materials during the stir friction deposition additive manufacturing process, which is beneficial to the formation of the deposition layer and improves the deposition efficiency. It is also beneficial to the application of hard high-strength materials in stir friction deposition additive manufacturing, which can expand the scope of application of the materials and improve the stability of the hard high-strength material additive manufacturing process, which is beneficial to meet the high-quality and high-efficiency manufacturing requirements of large structures.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 Schematic diagram of the three-dimensional structure of the additive component provided by the embodiment of the present invention Figure 1 ;

[0023] Figure 2 is a cross-sectional view of the internal structure of an additive component provided by an embodiment of the present invention;

[0024] Figure 3 yes Figure 2 A local enlarged schematic diagram of location III;

[0025] Figure 4Schematic diagram of the three-dimensional structure of the additive component provided by the embodiment of the present invention Figure 2 ;

[0026] Figure 5 It is a flowchart of the friction stir deposition additive manufacturing method provided by an embodiment of the present invention.

[0027] Reference numerals:

[0028] 10. Additive component; 101. Feeding channel; 102. Shoulder side; 103. Storage cavity; 103a. Opening; 1031. Side wall; 1032. Spiral groove; 104. Reference surface; 11. Main body; 12. Clamping part. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In addition, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without any distinction in order or importance.

[0032] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Additive manufacturing of lightweight and high-strength aluminum alloys is an effective means to meet the needs of lightweight, integrated performance and structural design. Traditional additive manufacturing mainly uses arc, laser, and electron beam as heat sources to melt and solidify wire or powder to form a deposition layer. However, for high-strength aluminum alloys, there are problems such as alloy element burnout, uneven microstructure, and pore crack defects during the melting and solidification process, which seriously hinder the industrial application of high-strength aluminum alloy additive manufacturing components.

[0035] Friction stir deposition additive manufacturing is a solid-phase additive manufacturing technology that generates intense friction and plastic deformation through the contact between a high-speed rotating rod and a substrate, thereby producing thermal plasticization and forming a deposition layer under the constraint of a hollow stirring head. This method does not involve the melting and solidification of materials throughout the process, effectively avoiding the burning of elements and thermal crack defects, and is particularly suitable for additive manufacturing of lightweight and high-strength materials such as aluminum and magnesium. The non-melting and large plastic deformation characteristics of friction stir deposition additive manufacturing also make the interior of the component present uniform and fine equiaxed grains, which is beneficial to the mechanical properties of the component.

[0036] It should be noted that in the process of friction stir deposition additive manufacturing, only the area of ​​the rotating rod that is directly deformed by friction with the substrate or the previous deposition layer can be thermoplasticized, and the thermoplasticized area is immediately deposited on the substrate under the forging action of the shoulder, that is, the thermoplasticization and deposition of the material are carried out simultaneously. For high-strength aluminum alloys such as 2 series and 7 series for aerospace or other hard and high-strength materials, their plastic deformation ability is poor, and the material fluidity is poor in the early stage of thermoplasticization. Directly forming a deposition layer will result in poor deposition layer formation due to insufficient material flow, and weak connection defects will occur between deposition layers due to insufficient material flow, and the deposition efficiency is low.

[0037] Reference below Figure 1-Figure 4 , describing an additive component 10 according to an embodiment of the present invention.

[0038] According to an embodiment of the present invention, an additive component 10 is used in a friction stir deposition additive manufacturing device. The additive component 10 has an axial direction and a feeding channel 101. The feeding channel 101 penetrates the additive component 10 along the axial direction. The additive component 10 is formed with a shoulder side 102 facing the substrate at one end of the axial direction. A storage cavity 103 is provided in the additive component 10. The storage cavity 103 is arranged around the circumference of the feeding channel 101 and is connected to the feeding channel 101 and is adjacent to the shoulder side 102.

[0039] The additive component 10 may refer to a component used for feeding materials in a stir friction deposition additive manufacturing device. Its function may refer to a stirring head of friction welding, but it has more functions than a stirring head.

[0040] The axial direction of the additive component 10 may refer to the direction in which the length of the additive component 10 extends. Figure 1When the additive component 10 is fed with rods in the vertical direction, the axial direction of the additive component 10 may be Figure 1 In the above embodiment, the shape of the additive component 10 as a whole can be, but is not limited to, a cylindrical or polygonal prism shape, etc., and no specific limitation is made here. For example, referring to Figure 1 , the shape of the additive component 10 can be cylindrical.

[0041] The feed channel 101 of the additive component 10 may refer to a channel for feeding the rod. The cross section of the feed channel 101 perpendicular to the axial direction may be the same as or different from the shape of the rod. For example, the rod may be circular, and the cross section of the feed channel 101 perpendicular to the axial direction may be, but not limited to, circular or square, etc., which will not be described in detail here. Figure 1 and Figure 4 The cross section of the feeding channel 101 perpendicular to the axial direction is square.

[0042] The shoulder side 102 may refer to the end of the additive component 10 facing the substrate, which may have a forging effect on the deposited material during the friction stir deposition additive manufacturing process.

[0043] During the friction stir deposition additive manufacturing process, when the rod is transported in the axial direction in the feeding channel 101, the rod may rub against the substrate or the previous deposition layer to cause thermoplastic deformation. Since the storage chamber 103 is connected to the feeding channel 101, the storage chamber 103 can be used to store the deposition material in the thermoplasticized area formed by thermoplastic deformation, so that the thermoplastically deformed deposition material can be gathered here to preheat the material before deposition and further soften the material before deposition.

[0044] “The storage chamber 103 is circumferentially arranged around the feeding channel 101” can be understood as that there can be multiple storage chambers 103, and the multiple storage chambers 103 are arranged at intervals along the circumference of the feeding channel 101, or the storage chamber 103 is an entire annular cavity, which is concentrically arranged with the feeding channel 101. In the above embodiment, no specific limitation is made here.

[0045] “The storage chamber 103 is adjacent to the shoulder side 102” can be understood as the storage chamber 103 is arranged adjacent to the shoulder side 102, and may have a small distance between the storage chamber 103 and the shoulder side 102, or the storage chamber 103 penetrates the shoulder side 102 in the axial direction. In the above embodiments, no specific limitation is made here.

[0046] It should be noted that the additive component 10 can be understood as one of the components of the stir friction deposition additive manufacturing device, which is used to transport the stir friction deposition additive rods. The other structures and operations of the stir friction deposition additive manufacturing device are known to those skilled in the art and will not be repeated here.

[0047] According to the additive component 10 of the embodiment of the present invention, in the process of friction stir deposition additive manufacturing, by setting a storage chamber 103 in the additive component 10, the friction between the rotating rod and the inner wall of the storage chamber 103 is used to generate a high value of instantaneous shear strain, and more friction and deformation heat are generated, so that the material can be thermoplasticized in the storage chamber 103 in advance before deposition, reducing the flow stress of the material, and improving the fluidity of the material, which is conducive to the application of hard high-strength materials (such as 2 series, 7 series high-strength aluminum alloys, etc.) in friction stir deposition additive manufacturing, and can expand the scope of application of the material. Moreover, the use of the above-mentioned additive component 10, due to the better fluidity of the material in the deposition stage, can reduce the probability of weak connection defects caused by insufficient material flow, which is conducive to strengthening the metallurgical bonding of the deposition layer interface, optimizing component forming, and improving deposition efficiency. In addition, it is also conducive to improving the stability of the additive manufacturing process of hard high-strength materials, and meeting the high-quality and high-efficiency manufacturing requirements of large structures.

[0048] On the other hand, since the material is thermoplasticized in advance before deposition, the material has better fluidity, and a smaller torque can be applied to the rod during the deposition process, which is beneficial to reducing the feeding torque required for the rod to be fed in the axial direction. While improving the deposition efficiency, it can also reduce the equipment load of the stir friction deposition additive manufacturing device, reduce energy consumption, and thus reduce the cost of use.

[0049] In some embodiments of the present invention, reference Figure 1 The storage cavity 103 is an annular cavity arranged circumferentially around the feeding channel 101 .

[0050] The "annular cavity" may be, but is not limited to, a circular ring, a square ring, a polygonal ring, etc. For example, referring to Figure 1 , the annular cavity is a circular ring.

[0051] It can be understood that by setting the storage chamber 103 as an annular cavity, the surrounding sides of the storage chamber 103 can be connected to the feeding channel 101, so that the surrounding sides of the material before deposition can be preheated more comprehensively and evenly, reducing the occurrence of preheating dead corners on the surrounding sides of the material before deposition, and reducing the probability of the material before deposition affecting its fluidity due to the failure to effectively eliminate local flow stress, which is beneficial to further improve the fluidity of the material, thereby further strengthening the metallurgical bonding of the deposition layer interface and improving the component forming quality.

[0052] The storage cavity 103 is an annular cavity and can provide a larger storage space within a limited space, which is conducive to accommodating more thermoplastic materials and increasing the heat in the storage cavity 103, so as to more fully preheat the material before deposition, which is conducive to further reducing the flow stress of the material, improving the fluidity of the material, and further strengthening the metallurgical bonding of the deposition layer interface, thereby improving the molding quality of the component.

[0053] In some embodiments of the present invention, reference Figures 1 to 3 The material storage cavity 103 extends toward the direction close to the shaft shoulder side 102 , and penetrates the shaft shoulder side 102 to form an opening 103 a .

[0054] An opening 103a is formed through the storage chamber 103 that passes through the shoulder side 102. The high-temperature thermoplastic material accumulated in the storage chamber 103 can eventually flow out of the feeding channel 101 together with the material before deposition, and finally be deposited on the substrate or the previous deposition layer. Therefore, the thermoplastic material in the storage chamber 103 can be updated in real time, which is beneficial for the storage chamber 103 to always maintain a high heat to preheat the material before deposition, thereby reducing the probability of poor effect of increasing material fluidity due to insufficient preheating heat.

[0055] Secondly, in conventional stir friction deposition additive manufacturing devices, in order to promote material mixing between deposition layers and strengthen interface metallurgical bonding, a stirring needle is provided at the shoulder position of the stirring head facing the substrate, and the stirring needle is generally provided on both sides of the feeding channel. However, since the stirring needle is eccentrically arranged, the linear speed during the rotational friction process is relatively high, resulting in a high degree of wear on the stirring needle during the deposition process. Moreover, the flow stress required for hard and high-strength materials in the initial stage of thermoplasticization is greater, which will further aggravate the wear of the stirring needle, seriously affecting the stability of the additive manufacturing process of hard and high-strength materials, and is not conducive to meeting the high-quality and high-efficiency manufacturing requirements of large structures. An opening 103a is formed by running through the shoulder side 102 through the storage chamber 103, which can increase the fluidity of the material while eliminating the need to provide a stirring needle on the shoulder side 102 of the additive component 10, thereby solving the problem of stirring needle wear and reducing material and manufacturing costs, which is beneficial to improving the stability of the additive manufacturing process of hard and high-strength materials and further meeting the high-quality and high-efficiency manufacturing requirements of large structures.

[0056] In some embodiments of the present invention, reference Figure 3 , from the direction of the feeding channel 101 to the shoulder side 102, the peripheral side wall 1031 of the storage cavity 103 is inclined toward the side away from the feeding channel 101; and a reference surface 104 parallel to the axial direction is provided, and an angle α is provided between the peripheral side wall 1031 of the storage cavity 103 and the reference surface 104, wherein 2 degrees ≤ α ≤ 10 degrees.

[0057] In the above embodiments, α may be, but is not limited to, 2 degrees, 3 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, etc.

[0058] It can be understood that by setting the angle α between the circumferential side wall 1031 of the storage cavity 103 and the reference surface 104 within the above-mentioned range, as the rod is fed in the feeding channel 101, the circumferential side wall 1031 can form a thrust toward the shoulder side 102, which can more easily bring the thermoplastic material in the storage cavity 103 out of the storage cavity 103 along with the rod, thereby avoiding the thermoplastic material from accumulating and adhering to the circumferential side wall 1031 of the storage cavity 103 and causing blockage.

[0059] In some embodiments of the present invention, reference Figure 3 A spiral groove 1032 is provided on the peripheral side wall 1031 of the storage cavity 103 , and the rotation direction of the spiral groove 1032 is the same as the rotation direction of the additive component 10 .

[0060] The rotation direction of the spiral groove 1032 can be adaptively adjusted according to the rotation direction of the additive component 10 , and the spiral groove 1032 can be in a right-handed direction or a left-handed direction.

[0061] In the above technical solution, by providing the spiral groove 1032 on the peripheral side wall 1031 of the storage cavity 103, the contact area between the thermoplastic material and the peripheral side wall 1031 can be increased, which is conducive to increasing friction and deformation heat. Moreover, the spiral groove 1032 can also increase the deformation of the thermoplastic material during the rotation of the additive component 10, and increase the pushing and extruding force of the thermoplastic material in the storage cavity 103 toward the shoulder side 102, which is conducive to promoting the thermoplastic material to flow and deposit toward the substrate or the previous deposition layer, and can further prevent the thermoplastic material from accumulating and adhering to the peripheral side wall 1031 of the storage cavity 103, and reduce the probability of blockage caused by continuous accumulation of materials in the storage cavity 103.

[0062] In some embodiments of the present invention, the spiral groove 1032 is provided in a plurality along the axial direction, and the pitch between any two adjacent spiral grooves 1032 is L, wherein 0.4 mm≤L≤2 mm.

[0063] “The spiral groove 1032 is provided in a plurality along the axial direction” can be understood as the number of the spiral groove 1032 can be two, three, four, etc. For example, refer to Figure 3 , the spiral grooves 1032 are arranged in four along the axial direction.

[0064] In the above embodiments, L may be, but is not limited to, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, and the like.

[0065] In some embodiments of the present invention, reference Figure 3The height of the storage cavity 103 in the axial direction is H, wherein 2mm≤H≤8mm.

[0066] H can be, but is not limited to, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, and the like.

[0067] It can be understood that by setting the height H of the storage chamber 103 in the axial direction within the above-mentioned range, the storage chamber 103 can have an appropriate height, and the thermoplasticized material in the storage chamber 103 can have a larger contact area height with the material before deposition, which is beneficial for the thermoplasticized material in the storage chamber 103 to fully preheat the material before deposition, and is beneficial for further reducing the flow stress of the material and improving the fluidity of the material.

[0068] In some embodiments of the present invention, reference Figure 3 The additive component 10 also has a radial direction perpendicular to the axial direction, and the depth of the storage cavity 103 in the radial direction relative to the feeding channel 101 is T, wherein 2mm≤T≤5mm.

[0069] T can be, but is not limited to, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, and the like.

[0070] It can be understood that by setting the depth T of the storage chamber 103 in the radial direction relative to the feeding channel 101 within the above range, it is beneficial to make the storage chamber 103 have a larger storage space, which can accommodate more thermoplasticized materials, thereby storing more heat, and further enhancing the preheating effect of the material before deposition.

[0071] In some embodiments of the present invention, reference Figure 1 , Figure 2 and Figure 4 The additive component 10 includes a main body 11 and a clamping portion 12, wherein the clamping portion 12 is disposed on one axial side of the main body 11 and is disposed in a circumferential ring around the main body 11. By providing the clamping portion 12, the clamping portion 12 can be fixed by a locking nut and a friction stir deposition additive manufacturing device, so that the additive component 10 can be conveniently installed in the friction stir deposition additive manufacturing device.

[0072] A specific embodiment of the additive component 10 of the present invention is described below.

[0073] Reference Figures 1 to 4The additive component 10 is used for a stir friction deposition additive manufacturing device. The additive component 10 has an axial direction and a feeding channel 101. The feeding channel 101 penetrates the additive component 10 in the axial direction. The additive component 10 is formed with a shoulder side 102 facing the substrate at one end of the axial direction. A storage cavity 103 is provided in the additive component 10. The storage cavity 103 is an annular cavity arranged around the circumference of the feeding channel 101 and is connected to the feeding channel 101. The storage cavity 103 extends in the axial direction toward the shoulder side 102, and penetrates the shoulder side 102 to form an opening 103a.

[0074] From the direction of the feeding channel 101 pointing to the shoulder side 102, the peripheral side wall 1031 of the storage chamber 103 is inclined to the side away from the feeding channel 101. The peripheral side wall 1031 of the storage chamber 103 is also provided with a spiral groove 1032, and the rotation direction of the spiral groove 1032 is the same as the rotation direction of the additive component 10. With this arrangement, the thermoplasticized material in the storage chamber 103 is transmitted and extruded downward under the feeding axial force, the peripheral side wall 1031 of the storage chamber 103 and the spiral groove 1032, and finally, under the forging action of the shoulder side 102, a new dense and uniform deposition layer will be formed on the substrate or the previous deposition layer, and finally the component additive manufacturing is realized.

[0075] In the above-mentioned embodiment, by setting a storage chamber 103 in the additive component 10, a high value of instantaneous shear strain can be generated between the rod and the inner wall of the storage chamber 103 when the rod rotates, so that the material can be thermoplasticized in the storage chamber 103 in advance before deposition, reducing the flow stress of the material and improving the fluidity of the material, which is conducive to the application of hard and high-strength materials (such as 2 series and 7 series high-strength aluminum alloys, etc.) in stir friction deposition additive manufacturing, and can expand the application range of the material. In addition, the use of the above-mentioned additive component 10 can reduce the probability of weak connection defects caused by insufficient material flow due to better material fluidity during the deposition stage, which is conducive to strengthening the metallurgical bonding of the deposition layer interface, optimizing component forming, and improving deposition efficiency.

[0076] Since the material is thermoplasticized in advance before deposition, the material has better fluidity, which is also conducive to reducing the rod feeding torque required during the axial feeding process of the rod, and can reduce the equipment load of the stir friction deposition additive manufacturing device while improving the deposition efficiency, which is conducive to reducing energy consumption and reducing the cost of use. The additive component 10 of the above structure can also improve the stability of the additive manufacturing process of hard and high-strength materials, which is conducive to meeting the high-quality and high-efficiency manufacturing requirements of large structures.

[0077] A friction stir deposition additive manufacturing device according to an embodiment of the present invention includes an additive component 10 as described in any of the above embodiments.

[0078] The friction stir deposition additive manufacturing device according to the embodiment of the present invention can improve the fluidity of the initial stage of thermoplasticization of high-strength aluminum alloy or other hard high-strength materials during the friction stir deposition additive manufacturing process, which is beneficial to the formation of the deposition layer and improves the deposition efficiency. It is also beneficial to the application of hard high-strength materials in friction stir deposition additive manufacturing, which can expand the scope of application of the materials and improve the stability of the hard high-strength material additive manufacturing process, which is beneficial to meet the high-quality and high-efficiency manufacturing requirements of large structures.

[0079] According to a friction stir deposition additive manufacturing method according to an embodiment of the present invention, the friction stir deposition additive manufacturing method is manufactured by using an additive component 10 as described in any of the above embodiments, referring to Figure 5 , methods include:

[0080] Step S1, rotating the additive component 10 at a preset rotation speed and stopping at a preset height position from a substrate.

[0081] In the above steps, the preset rotation speed can be specifically set as needed so that the additive component 10 and the rod can rotate at high speed. In this step, the raw material rod enters the hollow feeding channel 101 of the additive component 10, and can rotate at high speed in coordination with the additive component 10, and is transmitted downward under the action of the axial rod feeding torque.

[0082] For example, the rod can be a round rod or a square rod with a diameter of 5 mm to 30 mm and a length of 100 mm to 1000 mm. The material can include but is not limited to 2 and 7 series high-strength aluminum, magnesium light alloys, and high-melting point and high-strength materials such as copper, titanium, and steel. The size of the rod is slightly smaller than the size of the feeding channel 101, and the downward feeding speed of the rod can be 1 mm / s-30 mm / s.

[0083] Step S2: feeding the rod into the feeding channel 101 of the additive component 10 and feeding it in the axial direction at a preset speed, so that the rod rubs against the substrate and generates thermoplastic deformation.

[0084] It is understandable that after the raw material bar contacts the substrate, it will undergo friction deformation and thermoplastic deformation with the substrate, thereby moving and depositing in the gap between the shoulder side 102 and the substrate. The gap between the shoulder side 102 and the substrate or the previous deposition layer is the deposition layer thickness, which can be set to 0.5 mm to 4 mm.

[0085] Step S3, waiting for the deposited material in the heat-plasticized area formed by the rod to fill the material storage chamber 103.

[0086] Due to the constraints of the deposited materials and the accumulation of friction deformation heat, the thermoplasticized area of ​​the raw material bar material becomes larger and larger, and is not accumulated in the storage cavity 103, and further generates instantaneous shear strain with the peripheral side wall 1031 of the storage cavity 103, until the thermoplastic material completely fills the storage cavity 103. That is, before deposition, the feed bar material is thermoplasticized in advance by friction and plastic deformation heat and temporarily stored in the storage cavity 103. Therefore, the thermoplasticized material in the storage cavity 103 can pre-plasticize the material before deposition, soften the material before deposition in advance, and increase the fluidity of the material.

[0087] Step S4: Move the additive component 10 along a preset path.

[0088] It can be understood that the additive component 10 moves along a preset path. During the movement, a high value of instantaneous shear strain can be generated between the rod and the inner wall of the storage chamber 103 when the rod rotates, thereby enabling the material to be thermally plasticized in the storage chamber 103 in advance before deposition, thereby reducing the flow stress of the material, improving the fluidity of the material, and reducing the probability of weak connection defects caused by insufficient material flow, which is beneficial to strengthening the metallurgical bonding of the deposition layer interface, optimizing component forming, and improving deposition efficiency.

[0089] The stir friction deposition additive manufacturing method provided by the embodiment of the present invention can improve the fluidity of the initial stage of thermoplasticization of high-strength aluminum alloy or other hard high-strength materials during the stir friction deposition additive manufacturing process, which is beneficial to the formation of the deposition layer and improves the deposition efficiency. It is also beneficial to the application of hard high-strength materials in stir friction deposition additive manufacturing, which can expand the scope of application of the materials and improve the stability of the hard high-strength material additive manufacturing process, which is beneficial to meet the high-quality and high-efficiency manufacturing requirements of large structures.

[0090] Other structures and operations of the friction stir deposition additive manufacturing device according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0091] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An additive component for a friction stir deposition additive manufacturing device, characterized in that: The additive component has an axial direction and a feeding channel, the feeding channel penetrates the additive component along the axial direction, and the additive component is located at one end of the axial direction and is formed with a shoulder side facing the substrate. A storage cavity is provided in the additive component, and the storage cavity is arranged around the circumference of the feeding channel and is connected to the feeding channel and is adjacent to the shoulder side.

2. The additive component according to claim 1, characterized in that The material storage cavity is an annular cavity arranged circumferentially around the material feeding channel.

3. The additive component according to claim 1 or 2, characterized in that The material storage cavity extends toward the direction close to the shaft shoulder side, and penetrates through the shaft shoulder side to form an opening.

4. The additive component according to claim 3, characterized in that From the direction from the feeding channel to the shaft shoulder side, the peripheral side wall of the storage cavity is inclined toward the side away from the feeding channel; A reference surface parallel to the axial direction is provided, and an angle α is provided between the peripheral side wall of the storage cavity and the reference surface, wherein 2 degrees ≤ α ≤ 10 degrees.

5. The additive component according to claim 4, characterized in that A spiral groove is provided on the peripheral side wall of the material storage cavity, and the rotation direction of the spiral groove is the same as the rotation direction of the additive component.

6. The additive component according to claim 5, characterized in that The spiral grooves are arranged in a plurality along the axial direction, and the pitch between any two adjacent spiral grooves is L, wherein 0.4 mm≤L≤2 mm.

7. The additive component according to any one of claims 1, 4 to 6, characterized in that The height of the material storage cavity in the axial direction is H, wherein 2mm≤H≤8mm.

8. The additive component according to claim 7, characterized in that The additive component further has a radial direction perpendicular to the axial direction, and a depth of the material storage cavity in the radial direction relative to the feeding channel is T, wherein 2 mm≤T≤5 mm.

9. A friction stir deposition additive manufacturing device, characterized in that: Comprising the additive component according to any one of claims 1 to 8.

10. A friction stir deposition additive manufacturing method, characterized in that: The additive component according to any one of claims 1 to 8 is manufactured, the method comprising: Rotating the additive component at a preset speed and stopping it at a preset height from the substrate; Feeding a rod into a feeding channel of the additive component and feeding the rod along the axial direction at a preset speed, so that the rod rubs against the substrate and generates thermoplastic deformation; Waiting for the deposited material in the heat-plasticized area formed by the rod to fill the material storage cavity; The additive component is moved along a preset path.

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