Additive component and friction stir deposition additive manufacturing device and method for composite structural part

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, and the feeding channel comprises a first part, a second part and a third part which are sequentially arranged in the axial direction and connected; the diameter of the first part is larger than that of the third part, a discharging port is formed in the end, away from the second part, of the third part, and the diameter of the second part is gradually reduced in the direction from the first part to the third part. By means of the method, the composite structural part of the special-shaped structure can be manufactured through the friction stir deposition additive method, the composite structural part can be formed at a time, plastic processing is not needed, the production procedures can be reduced, the preparation efficiency is improved, the stability of the deposition process is guaranteed, and the one-time forming preparation requirement of the composite structural part of the complex special-shaped structure is met; and intermetallic compounds can be prevented from being formed in the composite structural member, and the stability and the product yield of the composite structural member are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of friction stir deposition additive manufacturing, and in particular to a friction stir deposition additive manufacturing device and method for additive components and composite structural parts. Background Art

[0002] Composite structural parts have high specific strength and functional characteristics because they are composite materials, and thus have a wider range of application scenarios. For example, titanium / aluminum composite structural parts have great application prospects in the field of 3C electronic products. For example, the iPhone 15 Pro released by Apple in 2023 replaced the previous aluminum alloy body with a titanium / aluminum composite structural part frame, reducing the weight by 9g on the basis of the original strength.

[0003] In the related art, composite structural parts need to first use composite plate rolling technology to roll metal plates of different materials to obtain composite plates, and then obtain composite structural parts of target shape by bending, milling and other mechanical processing methods. For some special-shaped composite structural parts, there are generally arc corners or folded corners, so the prepared composite plates need to be further processed. For example, the composite plates need to be bent and formed to form special-shaped composite structural parts with arc corners. However, the above-mentioned forming process is complicated and the preparation efficiency is relatively low. Moreover, since the plastic deformation ability of composite structural parts is generally poor, the bending forming angle is difficult to control. During the preparation process, the composite structural parts form intermetallic compounds through interface metallurgical reactions to achieve interface connection. During the bending and forming process, the interface of the composite material is very easy to crack along these brittle and hard intermetallic compounds, resulting in low product yield. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an additive component that can improve the preparation efficiency of a composite structural component and can improve the molding quality and product yield of the composite structural component.

[0005] The present invention also aims to provide a friction stir deposition additive manufacturing device for composite structural parts to apply the above-mentioned additive components.

[0006] The present invention also aims to propose a friction stir deposition additive manufacturing method for composite structural parts, so as to apply the above-mentioned friction stir deposition additive manufacturing device for composite structural parts.

[0007] According to an embodiment of the present invention, an additive component is used in a friction stir deposition additive manufacturing device for a composite structure. The additive component has an axial direction and a feed channel. The feed channel penetrates the additive component along the axial direction. The feed channel includes a first part, a second part, and a third part which are arranged in sequence and connected along the axial direction. The diameter of the first part is greater than the diameter of the third part. An outlet is formed at one end of the third part away from the second part. The diameter of the second part gradually decreases in a direction from the first part to the third part.

[0008] According to the additive component of the embodiment of the present invention, the additive component can realize the stir friction deposition additive method to manufacture composite structural parts with special structures. The composite structural parts can be formed in one time without plastic processing, which can reduce the production process, improve the preparation efficiency, and ensure the stability of the deposition process to meet the one-time forming preparation requirements of composite structural parts with complex special structures. During the manufacturing process, the additive component does not need to rotate with the rod, which can avoid the problem of process instability caused by the rotation and shaking of the additive component, improve the applicability and stability of the process, and through the low heat input and large plastic deformation characteristics of the additive component during stir friction deposition additive manufacturing, it can also prevent the formation of intermetallic compounds in the composite structural parts, which can improve the stability of the composite structural parts and the product yield.

[0009] In some embodiments of the present invention, the second portion is configured such that the roughness of the inner wall surface is greater than the roughness of the inner wall surface of the first portion.

[0010] In some embodiments of the present invention, the inner wall surface of the second portion is configured as at least one of an arc-shaped wall surface, a curved wall surface, and a conical wall surface.

[0011] In some embodiments of the present invention, the inner wall surface of the second portion is configured as a multi-step structure.

[0012] In some embodiments of the present invention, the multi-step step structure includes a plurality of step portions, each of the step portions includes a first surface and a second surface that are vertical and connected, the second surface is parallel to the axial direction, and the distance difference between any two adjacent second surfaces is T, where 2mm≤T≤5mm.

[0013] In some embodiments of the present invention, in the axial direction, the height of the second surface is H, wherein 1 mm ≤ H ≤ 6 mm.

[0014] In some embodiments of the present invention, along the axial direction, the length of the first portion is greater than the length of the second portion, and the length of the second portion is greater than the length of the third portion.

[0015] In some embodiments of the present invention, the additive component includes a first segment and a second segment connected to each other, the second segment is a rotating body structure, the first part is arranged in the first segment, the second part and the third part are arranged in the second segment, and the diameter of the second segment gradually decreases in the direction from the first part to the third part.

[0016] A friction stir deposition additive manufacturing apparatus for a composite structural part according to an embodiment of the present invention comprises an additive component as described in any one of the foregoing descriptions.

[0017] The friction stir deposition additive manufacturing device for composite structural parts according to the embodiment of the present invention can realize the friction stir deposition additive method to manufacture composite structural parts with special-shaped structures. The composite structural parts can be formed in one step without plastic processing, which can reduce the production process, improve the preparation efficiency, and ensure the stability of the deposition process to meet the one-step forming preparation requirements of composite structural parts with complex special-shaped structures. Due to the low heat input and large plastic deformation characteristics during friction stir deposition additive manufacturing, it can also prevent the formation of intermetallic compounds in the composite structural parts, thereby improving the stability of the composite structural parts and the product yield.

[0018] According to an embodiment of the present invention, a friction stir deposition additive manufacturing method for a composite structural part is provided. The composite structural part is manufactured using the friction stir deposition additive manufacturing device for a composite structural part as described above. The composite structural part includes a stacked substrate layer and an additive layer, and the substrate layer has a corner position. The method includes: keeping the additive component stationary and stopping it at a preset height position away from the corner position of the substrate layer; feeding a rod into a feeding channel of the additive component and feeding it along the axial direction at a preset rotation speed; the rod rotates and contacts the second part of the feeding channel to generate heat by friction deformation and is directly thermoplasticized and extruded from the discharge port; the extruded thermoplasticized material is deposited at the corner position of the substrate layer and filled between the additive component and the substrate layer, and the additive component simultaneously forges the deposition layer to obtain the additive layer on the substrate layer; the additive component moves along a preset path.

[0019] The friction stir deposition additive manufacturing method for composite structural parts according to the embodiment of the present invention can realize the friction stir deposition additive method to manufacture composite structural parts with special-shaped structures. The composite structural parts can be formed in one step, which improves the preparation efficiency and ensures the stability of the deposition process to meet the one-step preparation requirements of composite structural parts with complex special-shaped structures. Due to the low heat input and large plastic deformation characteristics during friction stir deposition additive manufacturing, it can also prevent the formation of intermetallic compounds in the composite structural parts, which can improve the stability and product yield of the composite structural parts.

[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 A schematic diagram of a three-dimensional structure of an additive component provided in some embodiments of the present invention;

[0023] Figure 2 A cross-sectional view of the internal structure of an additive component provided by some embodiments of the present invention;

[0024] Figure 3 A schematic diagram of a partial structure of an additive component provided in some embodiments of the present invention;

[0025] Figure 4 for Figure 2 A local enlarged schematic diagram of IV;

[0026] Figure 5 Schematic diagram of manufacturing composite structural parts by additive components provided in some embodiments of the present invention Figure 1 ;

[0027] Figure 6 Schematic diagram of manufacturing composite structural parts by additive components provided in some embodiments of the present invention Figure 2 ;

[0028] Figure 7 A flow chart of a friction stir deposition additive manufacturing method for a composite structure provided in some embodiments of the present invention;

[0029] Figure 8 A cross-sectional morphology diagram of a composite structural part prepared by the friction stir deposition additive manufacturing method for a composite structural part according to an embodiment of the present invention;

[0030] Fig. 9 The interface micro-morphology of the composite structure prepared by the composite plate rolling technology is a related technology;

[0031] Fig.10 This is a microscopic morphology of the interface of a composite structural part manufactured by the friction stir deposition additive manufacturing method for a composite structural part according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] 10. Additive components;

[0034] 101, feeding channel; 1011, first part; 1012, second part; 1013, third part; 1013a, discharge port; 102, multi-step structure; 1021, step part; 10211, first surface; 10212, second surface; 103, shoulder; 104, clamping part; 11, first section; 12, second section;

[0035] 20. Composite structural parts;

[0036] 201, substrate layer; 2011, corner position; 202, additive layer.

[0037] 30. Rods. DETAILED DESCRIPTION

[0038] 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.

[0039] In the description of the present invention, it is necessary to understand that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and are used to distinguish the described features, without distinction of order or importance.

[0040] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0041] 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.

[0042] An additive component 10 according to an embodiment of the present invention will be described below with reference to the drawings.

[0043] like Figure 1 and Figure 2 As shown, an additive component 10 according to an embodiment of the present invention is used in a stir friction deposition additive manufacturing device for a composite structural part. The additive component 10 has an axial direction F1 and a feeding channel 101. The feeding channel 101 runs through the additive component 10 along the axial direction F1. The feeding channel 101 includes a first part 1011, a second part 1012 and a third part 1013 which are sequentially arranged and connected along the axial direction F1. The diameter of the first part 1011 is greater than the diameter of the third part 1013. An outlet 1013a is formed at one end of the third part 1013 away from the second part 1012. In the direction from the first part 1011 to the third part 1013, the diameter of the second part 1012 gradually decreases.

[0044] The additive component 10 may refer to a component used for feeding in a friction stir deposition additive manufacturing device for composite structural parts, and can forge the deposited layer. Its function can refer to the stirring head of the friction stir welding in the related art, but it is different from the stirring head in the prior art. Among them, the bottom of the additive component 10 can form a shoulder 103, and the shoulder 103 can forge the deposited layer.

[0045] The axial direction F1 of the additive component 10 can be referred to Figure 1 and Figure 2 The feeding channel 101 may refer to a channel for feeding the rod 30. In the above embodiment, the shape of the additive component 10 may be, but not limited to, a cylindrical shape or a polygonal prism shape, etc., and no specific limitation is made here. For example, Figure 1 , the additive component 10 may be cylindrical.

[0046] During the friction stir deposition additive manufacturing, the rod 30 is fed into the feeding channel 101 of the additive component 10 and rotated at a preset speed. During this process, the additive component 10 remains stationary and does not rotate with the rod 30. Since in the structure of the feeding channel 101, the second part 1012 receives the first part 1011 and the third part 1013, and the diameter of the second part 1012 gradually decreases, the rod 30 exerts a greater pressure on the inner wall surface of the second part 1012 during the feeding process along the axial direction F1, so that when the rod 30 rotates, a greater friction heat is generated between the rod 30 and the inner wall surface of the second part 1012, causing the rod 30 to undergo thermoplastic deformation and be extruded from the discharge port 1013a. The rod 30 can undergo thermoplastic deformation without contacting and rubbing with the substrate or the previous deposition layer, and material deposition is performed. In other words, the additive component 10 of the present invention can be used to manufacture the required structural parts by extruding thermoplastic material on the substrate or the previous deposition layer. When manufacturing a composite structural part 20 with a special structure, the additive layer 202 can be deposited on the arc position or the angle position of the substrate layer 201 with the special structure through the additive component 10, thereby obtaining the composite structural part 20, thereby the composite structural part 20 with a special structure can be manufactured by the stir friction deposition additive method.

[0047] Compared with conventional friction stir deposition additive manufacturing, which uses high-speed rotating rods and substrates to generate heat through friction, thereby achieving thermoplastic deposition to prepare composite structural parts, especially for composite structural parts with special structures. Due to the influence of the arc position and / or the angle position, the end face of the rod cannot effectively rub against the substrate, resulting in insufficient friction heat generation and difficulty in achieving effective deposition. In other words, conventional friction stir deposition additive manufacturing of composite structural parts with special structures is difficult.

[0048] When the present invention performs stir friction deposition additive manufacturing on the composite structural part 20 through the additive component 10, especially for the composite structural part 20 with a special-shaped structure, when the rod 30 rotates at high speed in the feeding channel 101, the rod 30 can rub against the inner wall surface of the second part 1012 and generate heat, so that the rod 30 can be pre-thermally plasticized in the second part 1012, and the extruded thermoplasticized material can be directly deposited on the arc position and / or the angle position of the special-shaped structure of the substrate layer 201, thereby achieving one-time molding. Moreover, when the present invention performs stir friction deposition additive manufacturing on the composite structural part 20 through the additive component 10, since there is no need for the rod 30 to contact the substrate layer 201 to generate friction heat, the heat input when the stir friction deposition additive manufacturing is performed by the present invention is smaller than that of the conventional stir friction deposition additive manufacturing, thereby suppressing the generation of intermetallic compounds between the composite material interfaces of the composite structural part 20, and improving the molding quality of the composite structural part 20.

[0049] It should be noted that the composite structural member 20 mentioned in the present invention may include but is not limited to a titanium / aluminum composite structural member. The composite structural member 20 may be a composite material structure of other two or more materials, and no specific limitation is made here.

[0050] According to the additive component 10 of the embodiment of the present invention, the additive component 10 can realize the manufacturing of the composite structure 20 with a special-shaped structure by the stir friction deposition additive method. The composite structure 20 can be formed in one time without plastic processing, which can reduce the production process, improve the preparation efficiency, and ensure the stability of the deposition process, so as to meet the one-time forming preparation requirements of the composite structure 20 with a complex special-shaped structure. During the manufacturing process, the additive component 10 does not need to rotate with the rod 30, which can avoid the problem of process instability caused by the rotation and shaking of the additive component 10, improve the process applicability and stability, and through the low heat input and large plastic deformation characteristics of the additive component 10 during the stir friction deposition additive manufacturing, it can also prevent the formation of intermetallic compounds in the composite structure 20, which can improve the stability and product yield of the composite structure 20.

[0051] In some embodiments of the present invention, the second portion 1012 is configured such that the roughness of the inner wall surface is greater than the roughness of the inner wall surface of the first portion 1011 .

[0052] The inner wall surface of the first part 1011 may be a smooth surface, and the inner wall surface of the second part 1012 may be a rough surface with a certain degree of roughness. For example, the inner wall surface of the second part 1012 may be engraved or convex. The inner wall surfaces of the first part 1011 and the second part 1012 may not be rough surfaces, but the roughness of the inner wall surface of the second part 1012 is greater than the roughness of the inner wall surface of the first part 1011. The inner wall surface of the third part 1013 may be a smooth surface or a rough surface, and no specific limitation is made here.

[0053] In the above technical solution, by setting the roughness of the inner wall surface of the second part 1012 to be relatively large, the friction force of the rod 30 in contact with the inner wall surface of the second part 1012 when rotating can be increased, thereby increasing the frictional heat generation, which is beneficial to the early and sufficient thermal plasticization of the rod 30, thereby improving the product molding quality and yield.

[0054] In some embodiments of the present invention, Figure 3 As shown, the inner wall surface of the second portion 1012 is constructed as at least one of an arc-shaped wall surface, a curved wall surface, and a conical wall surface.

[0055] like Figure 3 As shown in (a), the inner wall surface of the second part 1012 is constructed as an arc-shaped wall surface. Figure 3 As shown in (b), the inner wall surface of the second part 1012 is constructed as a curved wall surface. Figure 3As shown in (c), the inner wall surface of the second portion 1012 is configured as a tapered wall surface.

[0056] In the above technical solution, by setting the inner wall surface of the second part 1012 to the above shape, more design options for the second part 1012 can be provided, thereby improving the design flexibility of the second part 1012 to meet different usage requirements.

[0057] In some embodiments of the present invention, Figure 4 As shown, the inner wall surface of the second part 1012 is constructed as a multi-step structure 102. It can be understood that by providing the multi-step structure 102, the inner wall surface of the second part 1012 can have a greater roughness, thereby generating more heat through friction deformation when the rod 30 and the inner wall surface of the second part 1012 are in contact and rotated, which is more conducive to the thermal plasticization of the rod 30.

[0058] In some embodiments of the present invention, Figure 4 As shown, the multi-step structure 102 includes a plurality of step portions 1021, each step portion 1021 includes a first surface 10211 and a second surface 10212 that are vertical and connected, the second surface 10212 is parallel to the axial direction F1, and the distance difference between any two adjacent second surfaces 10212 is T, where 2mm≤T≤5mm.

[0059] It is understandable that T can be, but is not limited to, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc. Among the multiple step portions 1021 arranged in sequence along the axial direction F1, the distance difference between any two adjacent second surfaces 10212 can be equal or unequal, and no specific limitation is made here. Among them, the number of step portions 1021 can be set as needed, for example, the number of step portions 1021 can be 5 to 10.

[0060] In the above technical solution, by setting the distance difference between any two adjacent second surfaces 10212 in the multiple step portions 1021 within the above range, the inner wall surface of the second part 1012 can have a suitable roughness as a whole to meet different friction deformation heat generation requirements, which is conducive to adapting to the manufacture of composite structural parts 20 made of different materials.

[0061] In some embodiments of the present invention, Figure 4 As shown, in the axial direction F1, the height of the second surface 10212 is H, wherein 1 mm ≤ H ≤ 6 mm.

[0062] It is understandable that H may be, but is not limited to, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc. The heights of the plurality of second surfaces 10212 may be equal or unequal, and no specific limitation is made here.

[0063] In the above technical solution, by setting the height of the second surface 10212 within the above range and coordinating the distance difference between any two adjacent second surfaces 10212, the roughness of the inner wall surface of the second part 1012 can be further adjusted to meet different friction deformation heat generation requirements.

[0064] In some embodiments of the present invention, Figure 2 As shown, along the axial direction F1 , the length of the first portion 1011 is greater than the length of the second portion 1012 , and the length of the second portion 1012 is greater than the length of the third portion 1013 .

[0065] With the above structure, the length of the second part 1012 is more appropriate, so that the second part 1012 can be relatively close to the discharge port 1013a, and the thermoplasticized part of the rod 30 can be quickly extruded from the discharge port 1013a and deposited on the substrate layer 201 or the previous deposition layer. The first part 1011 and the third part 1013 are both circular channels with equal diameters.

[0066] In some embodiments of the present invention, Figure 2 As shown, the additive component 10 includes a first section 11 and a second section 12 connected to each other, the second section 12 is a rotating body structure, the first part 1011 is arranged in the first section 11, the second part 1012 and the third part 1013 are arranged in the second section 12, and the diameter of the second section 12 gradually decreases in the direction from the first part 1011 to the third part 1013.

[0067] The first section 11 may be a non-rotating structure or a rotating structure, for example, the first section 11 may be, but not limited to, a square column, a cylinder, etc. The second section 12 is a rotating structure, for example, the second section 12 may be a truncated cone or a curved cylinder.

[0068] “In the direction from the first part 1011 to the third part 1013, the diameter of the second section 12 gradually decreases”, it can be understood that the second section 12 is a truncated cone structure, or the second section 12 is a structure with an arc-shaped circumferential surface, or the second section 12 is a structure with a curved circumferential surface. This structure makes the width of the second section 12 relatively small, which can adapt to the operation in a narrow space.

[0069] In the above technical solution, by setting the additive component 10 into the above structure, when manufacturing the composite structural component 20 with a special-shaped structure, since the diameter of the second section 12 gradually decreases, the additive component 10 can adapt to the narrow space of the arc position or the angle position, which can prevent the additive component 10 from interfering with the special-shaped structure of the composite structural component 20, which is beneficial to reducing the distance between the discharge port 1013a and the substrate layer 201 or the previous deposition layer, facilitating the manufacturing and molding of the composite structural component 20, and also helping to improve the molding quality of the composite structural component 20.

[0070] In some embodiments of the present invention, reference Figure 1 and Figure 2 The additive component 10 is provided with a clamping portion 104, which is arranged in a circumferential ring around the additive component 10. By providing the clamping portion 104, the clamping portion 104 can be fixed in the composite structure friction stir deposition additive manufacturing device by bolts, so that the additive component 10 is conveniently installed in the composite structure friction stir deposition additive manufacturing device.

[0071] A specific embodiment of the additive component 10 of the present invention is described below.

[0072] like Figure 1 , Figure 2 and Figure 4 The additive component 10 is used for a friction stir deposition additive manufacturing device for composite structural parts. The additive component 10 has an axial direction F1 and a feeding channel 101. The feeding channel 101 runs through the additive component 10 along the axial direction F1. The feeding channel 101 includes a first part 1011, a second part 1012 and a third part 1013 which are sequentially arranged and connected along the axial direction F1. The diameter of the first part 1011 is greater than the diameter of the third part 1013. An outlet 1013a is formed at one end of the third part 1013 away from the second part 1012. In the direction from the first part 1011 to the third part 1013, the diameter of the second part 1012 gradually decreases. Among them, the inner wall surface of the second part 1012 is constructed as a multi-step step structure 102.

[0073] A friction stir deposition additive manufacturing apparatus for a composite structural part according to an embodiment of the present invention comprises an additive component 10 as described in any one of the above.

[0074] It should be noted that the friction stir deposition additive manufacturing device for composite structural parts may also include but is not limited to a feeding system, a control drive, a substrate fixing system, a heating system, a cooling system, a monitoring system, etc. The above structures can refer to the friction stir deposition additive manufacturing device of the related art, and will not be repeated here. The other components and operations of the friction stir deposition additive manufacturing device for composite materials of the embodiment of the present invention are known to ordinary technicians in the field and will not be described in detail here.

[0075] The friction stir deposition additive manufacturing device for composite structural parts according to the embodiment of the present invention can realize the friction stir deposition additive method to manufacture composite structural parts 20 with special-shaped structures. The composite structural parts 20 can be formed in one step without plastic processing, which can reduce production processes, improve preparation efficiency, and ensure the stability of the deposition process to meet the one-step forming preparation requirements of composite structural parts 20 with complex special-shaped structures. Due to the low heat input and large plastic deformation characteristics during friction stir deposition additive manufacturing, it is also possible to prevent the formation of intermetallic compounds in the composite structural parts 20, thereby improving the stability of the composite structural parts 20 and the product yield.

[0076] like Figures 5 to 7 As shown, according to a friction stir deposition additive manufacturing method for a composite structure according to an embodiment of the present invention, the composite structure is manufactured using the friction stir deposition additive manufacturing device for a composite structure as described above, and the composite structure 20 includes a substrate layer 201 and an additive layer 202 that are stacked, and the substrate layer 201 has a corner position 2011. The method includes:

[0077] Step S1 : Keep the additive component 10 still and stop it at a preset height position away from the corner position 2011 of the substrate layer 201 .

[0078] Step S2: feeding the rod 30 into the feeding channel 101 of the additive component 10, and feeding along the axial direction F1 at a preset rotation speed.

[0079] In the above steps, the material of the rod 30 is set as needed. For example, when the composite structural member 20 is a titanium / aluminum composite material, the substrate layer 201 can be a titanium plate, the additive layer 202 is an aluminum layer, and the rod 30 is an aluminum rod. The diameter of the rod 30 can be 5 mm to 30 mm. The feed speed of the rod 30 along the axial direction F1 can be 1 mm / s to 30 mm / s, and the preset rotation speed of the rod 30 can be 50 rpm to 1000 rpm. The diameter of the feeding channel 101 can be slightly larger than the diameter of the rod 30.

[0080] Step S3: The rod 30 rotates and contacts the second portion 1012 of the feeding channel 101, generates heat through friction deformation, and is directly thermally plasticized, and is extruded from the discharge port 1013a.

[0081] Step S4 , the extruded thermoplastic material is deposited at the corner position 2011 of the substrate layer 201 , and is filled between the additive component 10 and the substrate layer 201 . The additive component 10 simultaneously forges the deposited layer to obtain the additive layer 202 on the substrate layer 201 .

[0082] In the above steps, the hot plasticized part of the rod 30 can be deposited in the gap between the shoulder 103 of the additive component 10 and the substrate layer 201 after extrusion, and the shoulder 103 can also forge the deposited layer, so that the substrate layer 201 and the additive layer 202 can be better combined, thereby obtaining a stable and reliable additive layer 202 on the substrate layer 201.

[0083] Step S5: Move the additive component 10 along a preset path.

[0084] In the above steps, the preset path can be selected according to the shape of the composite structure 20. For example, the preset path can be a straight line, a curve, a serpentine, etc., and no specific limitation is made here. In the above steps, after the additive component 10 moves along the preset path, the required composite structure 20 can be obtained.

[0085] like Figure 8 As shown, Figure 8 This is a cross-sectional morphology diagram of a composite structural part prepared by the stir friction deposition additive manufacturing method for a composite structural part according to an embodiment of the present invention. As can be seen from the diagram, the prepared composite structural part 20 is dense and defect-free inside, which is conducive to meeting the high-quality one-time forming requirements of the composite structural part 20, and no subsequent mechanical processing such as bending is required.

[0086] like Fig. 9 and Fig.10 As shown, Fig. 9 This is the interface micromorphology of the composite structure prepared by composite plate rolling technology. It can be seen from the figure that intermetallic compounds are produced between the interfaces. Fig.10 This is an interface microscopic morphology diagram of a composite structural part manufactured by the stir friction deposition additive manufacturing method of the composite structural part according to an embodiment of the present invention. It can be seen from the diagram that no intermetallic compounds are produced between the interfaces, which can improve the interface connection strength of the composite material.

[0087] It can be understood that when the composite structural part stir friction deposition additive manufacturing method of the present invention is used to manufacture the composite structural part, the stationary additive component 10 can improve the stability of the deposition process and prevent problems such as tooling interference caused by the rotation and shaking of the additive component 10. The composite structural part 20 with a special-shaped structure manufactured by stir friction deposition additive manufacturing can be formed in one step without the need for mechanical processing such as bending, which can avoid damage to the performance of the composite material caused by machining, reduce production processes and costs, and improve production efficiency. No intermetallic compounds are produced at the interface of the composite structural part 20, which can improve the stability of the composite material.

[0088] The friction stir deposition additive manufacturing method for composite structural parts according to the embodiment of the present invention can realize the friction stir deposition additive method to manufacture composite structural parts 20 with special-shaped structures. The composite structural parts 20 can be formed in one step, which improves the manufacturing efficiency and ensures the stability of the deposition process to meet the one-step manufacturing requirements of composite structural parts 20 with complex special-shaped structures. Due to the low heat input and large plastic deformation characteristics during friction stir deposition additive manufacturing, it is also possible to prevent the formation of intermetallic compounds in the composite structural parts 20, which can improve the stability of the composite structural parts 20 and the product yield.

[0089] 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.

[0090] 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 use in a friction stir deposition additive manufacturing device for composite structural parts, characterized in that: The additive component has an axial direction and a feeding channel, the feeding channel passes through the additive component along the axial direction, the feeding channel includes a first part, a second part and a third part which are sequentially arranged and connected along the axial direction, the diameter of the first part is greater than the diameter of the third part, an outlet is formed at one end of the third part away from the second part, and the diameter of the second part gradually decreases in a direction from the first part to the third part.

2. The additive component according to claim 1, characterized in that The second portion is configured such that the roughness of the inner wall surface is greater than the roughness of the inner wall surface of the first portion.

3. The additive component according to claim 2, characterized in that The inner wall surface of the second portion is configured as at least one of an arc-shaped wall surface, a curved wall surface, and a conical wall surface.

4. The additive component according to claim 2, characterized in that The inner wall surface of the second portion is configured as a multi-step structure.

5. The additive component according to claim 4, characterized in that The multi-step structure includes a plurality of step portions, each of the step portions includes a first surface and a second surface that are vertical and connected, the second surface is parallel to the axial direction, and the distance difference between any two adjacent second surfaces is T, wherein 2mm≤T≤5mm.

6. The additive component according to claim 5, characterized in that In the axial direction, the height of the second surface is H, wherein 1 mm≤H≤6 mm.

7. The additive component according to claim 1, characterized in that Along the axial direction, the length of the first portion is greater than the length of the second portion, and the length of the second portion is greater than the length of the third portion.

8. The additive component according to any one of claims 1 to 7, characterized in that The additive component includes a first section and a second section that are connected, the second section is a rotating body structure, the first part is arranged in the first section, the second part and the third part are arranged in the second section, and the diameter of the second section gradually decreases in the direction from the first part to the third part.

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

10. A method for additive manufacturing of composite structural parts by friction stir deposition, characterized in that: The composite structural part is manufactured by the composite structural part friction stir deposition additive manufacturing device according to claim 9, the composite structural part comprises a substrate layer and an additive layer which are stacked, the substrate layer has a corner position, and the method comprises: Keeping the additive component still and stopping it at a preset height position away from a corner position of the substrate layer; Feeding the rod into the feeding channel of the additive component and feeding it along the axial direction at a preset rotation speed; The rod material rotates and contacts the second portion of the feeding channel, generates heat by friction deformation, and is directly thermally plasticized, and is extruded from the discharge port; The extruded thermoplastic material is deposited at the corner position of the substrate layer and filled between the additive component and the substrate layer, and the additive component simultaneously forges the deposited layer to obtain the additive layer on the substrate layer; The additive component is moved along a preset path.

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