A heterogeneous wire manufacturing method combining an interface staggered overlapping structure

Abstract

The present application relates to the technical field of fused deposition manufacturing, and discloses a heterogeneous material manufacturing method with an interfacial staggered overlapping structure. By setting the staggered overlapping interfacial structure, in the process of additive manufacturing of heterogeneous materials, the stress concentration phenomenon of the traditional continuous interface is broken by using the staggered arrangement strategy of the interfacial line of adjacent layers, the interfacial stress is dispersed and transmitted along the three-dimensional direction, and the interfacial bonding strength is strengthened from the geometric structure. At the same time, the active penetration and remelting of material B to material A at the interface are realized through the material rewriting mechanism, the peeling failure risk of the interfacial line caused by insufficient molecular diffusion is avoided, the interfacial staggered amount and the rewriting amount are cooperatively controlled, the definite process constraint boundary is established, the defects of overmelting or weak penetration of materials are prevented, the adaptability of the internal material region and the interfacial transition of heterogeneous materials is ensured, the process fluctuation is reduced, the repeatability of the manufacturing process is improved, and the fatigue resistance and structural bearing capacity of the interfacial line of heterogeneous materials are improved.

Description

Technical Field

[0001] This invention relates to the field of fused filament deposition manufacturing technology, specifically a method for manufacturing dissimilar filaments with an interfacial overlapping structure. Background Technology

[0002] Fused filament deposition (FDM) technology uses a nozzle to extrude heated and molten filaments, which are then layered vertically to form a three-dimensional component by creating a two-dimensional plane. FDM molding materials are widely used, primarily low-melting-point materials such as ABS, PLA, TPU, and paraffin wax. With the increasing demand for rigid-flexible integrated functional components, the design and manufacture of multi-material composite integral components are of great significance.

[0003] Currently, when using fused wire deposition technology to manufacture dissimilar filament composite components, there are limitations in the interfacial bonding between material A and material B: First, the dissimilar interfaces in traditional laminated structures are vertically aligned, resulting in a single continuous plane at the interface bonding area, leading to weak interfacial bonding strength and reduced interfacial load-bearing capacity and fatigue performance. Second, there is a lack of precise material interleaving and overlap control in the interface transition region, and the boundary lines between adjacent layers lack misalignment design, making it impossible to optimize the stress dissipation path through geometric structure. Furthermore, at the dissimilar interface within the same additive layer, the two materials are simply butted together, without active penetration and remelting of material B into the material A region. This results in the interfacial bonding strength relying on the adhesion effect of adjacent filaments and a small amount of molecular diffusion, which is significantly limited by material compatibility. In addition, existing methods lack a collaborative control mechanism for misalignment and remelting, and also lack joint constraint rules for layer thickness, wire feed radius, and wire direction angle, leading to numerous microscopic defects at the dissimilar interface. This makes the dissimilar material components prone to interfacial delamination failure, and the overall mechanical properties of the components cannot meet the requirements of high-reliability applications.

[0004] Therefore, a method for manufacturing dissimilar filaments with an interlaced and overlapping interface structure is proposed to solve the above problems. Summary of the Invention

[0005] (I) Technical problem to be solved: In view of the shortcomings of the prior art, the present invention provides a method for manufacturing dissimilar filaments with an interlaced and overlapping interface structure, which solves the problems mentioned in the background art above.

[0006] (II) Technical Solution: To achieve the above objectives, the present invention provides the following technical solution: a method for manufacturing dissimilar filaments with an interlaced interface structure, wherein the structure has an interlaced interface structure feature;

[0007] The interface is along the additive manufacturing height direction, with material A on one side and material B on the other side. The direction of the fabric fibers on both sides of the interface is unrestricted. The angle between the fabric fiber directions of the Nth additive layer and the (N-1)th and (N+1)th layers is unrestricted, and the angle between the fabric fiber direction and the interface direction is unrestricted, within 90°. The staggered feature of the interface means that the boundary lines of the dissimilar materials in the Nth additive layer are misaligned with the boundary lines of the dissimilar materials in the (N-1)th and (N+1)th layers, and the boundary lines of the dissimilar materials in the (N-1)th and (N+1)th layers are on the same three-dimensional plane.

[0008] The overlapping feature of the interface refers to the fact that, within the same additive layer, material B penetrates a certain amount of material rewriting into the region of material A at the interface between dissimilar materials.

[0009] Preferably, the interface staggered structure includes interface misalignment and interface rewriting. The interface misalignment is set to μL, where μ is the defined misalignment rate and L is the horizontal parallel distance between two adjacent filaments of the same material within the same additive layer, i.e., the filament pitch. The interface rewriting is set to... , The rewrite rate is undefined.

[0010] Preferably, the value of the wire pitch L is set by an inequality: Where R is the wire feeding radius to ensure the quality of material forming; the value of the misalignment rate μ is set by an inequality: To ensure effective dispersion of interfacial stress and prevent excessively large interfacial spans from affecting the properties of the single material region; the numerical relationship inequality for the rewrite rate φ is set as follows:

[0011] This ensures active penetration and remelting at the interface and prevents overmelting or weak penetration at the interface.

[0012] The misalignment rate μ and the overlap rate The value of is controlled collaboratively through the following inequality relationship: To optimize interface performance, the interface strength and fatigue performance are optimized to achieve the best state.

[0013] A method for manufacturing dissimilar filaments with an interfacial overlapping structure, comprising the following steps:

[0014] Step S1: Set up materials A and B, write material A first, then write material B;

[0015] Step S2: First write the first layer of material A, then change the filament and write the first layer of material B. The overlap between material B and material A at the interface will be used for copying. ;

[0016] Step S3: Write the Nth layer of material A (N=2,3,...,N), extending beyond the edge of the (N-1)th layer of material A region. Distance is the amount of misalignment;

[0017] Step S4: Write the Nth layer of material B (N=2,3,...,N), overlapping the material A at the interface with the material B by the same amount of copying. Distance is the amount of rewriting;

[0018] Step S5: When N reaches the maximum value of the component model slice, stop writing and proceed to step 6. If N does not reach the maximum value, continue to prepare N+1 layers and repeat steps S3 and S4.

[0019] Step S6: Complete the preparation and obtain a heterogeneous component with a novel interlaced overlapping structural interface.

[0020] Preferably, the writing order of each layer of material A and material B is determined by the melting temperature of the two materials. The material with the lower melting temperature is designated as A, and the material with the higher melting temperature is designated as B. Material A is written first, and material B is written later.

[0021] Preferably, material A and material B are any materials that are heated and extruded using the same FDM equipment.

[0022] Preferably, after each layer of material A is written, the filament can be changed to material B through a single heating nozzle to continue writing, thus repeating the process; alternatively, multiple heating nozzles can be used to change the filament to material B to continue writing, thus repeating the process.

[0023] Preferably, when preparing by this method, the wire pitch L in steps S2, S3 and S4 is set as follows: Where R is the wire feeding radius, to ensure the quality of material forming.

[0024] Preferably, when preparing the heterogeneous material bonding interface structure by this method, the misalignment rate μ and the overlap rate mentioned in steps S2, S3 and S4 are... The synergistic relationship between them is controlled by the following inequality formula: To prevent over-melting or weak bonding at the interface, and to prevent excessively large interface spans from affecting the performance of single material regions, while optimizing interface bonding performance, so that interface strength and fatigue performance reach the best state.

[0025] (III) Beneficial Effects: Compared with the prior art, the present invention provides a method for manufacturing dissimilar filaments with an interlaced and overlapping interface structure, which has the following beneficial effects:

[0026] 1. In this invention, by setting up an interlaced interface structure, during the additive manufacturing process of dissimilar filaments, the staggered arrangement strategy of the interface lines between adjacent layers of dissimilar materials is used to break the stress concentration phenomenon of traditional continuous interfaces, so that the interface stress is dispersed and transmitted along the three-dimensional direction, thereby improving the fatigue performance and structural load-bearing capacity of the dissimilar material interface. At the same time, through the material rewriting mechanism, material B actively penetrates and remelts material A at the interface, thereby strengthening the interface bonding strength from a geometrical perspective and avoiding the risk of peeling failure caused by insufficient molecular diffusion at the dissimilar material interface, thereby improving the overall mechanical reliability and service stability of the composite component.

[0027] 2. In this invention, the misalignment rate μ and the rewrite rate are controlled collaboratively. This enables coordinated control of interface misalignment and rewriting, and matches the wire feeding distance parameter L with the wire feeding radius R. This not only establishes clear process constraint boundaries, preventing over-melting or weak penetration defects of interface materials, but also ensures the adaptability of the material region and the interface between different materials. It allows the interface microstructure to be precisely controlled as needed, reducing process fluctuations and improving the repeatability of the manufacturing process.

[0028] 3. In this invention, by setting a material writing order and wire changing strategy based on melting point, on the basis of FDM compatible materials, low melting point materials are written first and the amount of high melting point materials rewriting the low melting point area is controlled. The remelting of the low melting point area by the high melting point material forms a more solid interface, while avoiding the limitation of material compatibility on interface performance. This enables the system to adapt to the manufacturing needs of diverse material combinations and improves the yield of dissimilar wire composite components. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the novel interlaced structure of dissimilar filament bonding interfaces in Examples 1, 2, and 5.

[0030] Figure 2 This is a schematic diagram of the novel interlaced structure of dissimilar filament bonding interface in Examples 3 and 4;

[0031] Figure 3 A flowchart of a method for manufacturing dissimilar filaments with an interfacial overlapping structure;

[0032] Figure 4 This is a schematic diagram and a partial side view of the interface of the dissimilar material tension member of Example 1;

[0033] Figure 5 This is a schematic diagram and a partial side view of the interface of the dissimilar material shearing component in Example 2;

[0034] Figure 6 This is a schematic diagram and a partial side view of the interface of the dissimilar material tension member of Example 3;

[0035] Figure 7 This is a schematic diagram and a partial side view of the interface of the dissimilar material shearing component in Example 4;

[0036] Figure 8 The image shows the actual bionic hand made of different materials and the bending of the joints in Example 5.

[0037] In the diagram: 1. Dissimilar material interface; 2. Material A; 3. Material B; TD: Tensile direction; SD: Compression and shear direction; H: Additive height direction. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1-8 This is a method for manufacturing dissimilar filaments with an interlaced interface structure, the structure having interlaced interface structure characteristics;

[0040] The interface runs along the additive manufacturing height direction, with material A on one side and material B on the other side.

[0041] The direction of the fabric fibers on both sides of the interface is not restricted. The angle between the direction of the fabric fibers in the Nth additive layer and the N-1 and N+1th layers is not restricted. The angle between the direction of the fabric fibers and the direction of the interface is not restricted and is within 90°.

[0042] The interlacing feature of the interface refers to the fact that the boundary line of the dissimilar material in the Nth additive layer is misaligned with the boundary line of the dissimilar material in the N-1 and N+1 layers, and the boundary lines of the dissimilar material in the N-1 and N+1 layers are on the same three-dimensional surface.

[0043] The overlap feature of the interface refers to the fact that in the same additive layer, material B penetrates into the region of material A by a certain amount of material rewriting at the interface between dissimilar materials.

[0044] The interface misalignment is set to μL, where μ is the defined misalignment rate and L is the horizontal parallel distance between two adjacent filaments of the same material within the same additive layer.

[0045] Interface rewrite amount set to , The rewrite rate is undefined.

[0046] The value of the wire pitch L is set through an inequality: Where R is the wire feeding radius to ensure the quality of material forming.

[0047] The value of the misalignment rate μ is set through an inequality: This ensures effective dispersion of interfacial stress and prevents excessively large interfacial spans from affecting the performance of individual material regions.

[0048] Rewrite rate The numerical inequalities are set as follows: This ensures active penetration and remelting at the interface and prevents overmelting or weak penetration at the interface.

[0049] Misalignment rate μ and overlap rate The value of is controlled collaboratively through the following inequality relationship: To optimize interface performance, the interface strength and fatigue performance are brought to their best state.

[0050] The specific process steps include:

[0051] Step S1: Set up materials A and B, write material A first, then write material B;

[0052] Step S2: First write the first layer of material A, then change the filament and write the first layer of material B. The overlap between material B and material A at the interface will be used for copying. ;

[0053] Step S3: Write the Nth layer of material A (N=2,3,...,N), extending beyond the edge of the (N-1)th layer of material A region. Distance is the amount of overlap;

[0054] Step S4: Write the Nth layer of material B (N=2,3,...,N), overlapping the material A at the interface. Distance is the amount of rewriting;

[0055] Step S5: When N reaches the maximum value of the component model slice, stop writing and proceed to step 6. If N does not reach the maximum value, continue to prepare N+1 layers and repeat steps S3 and S4.

[0056] Step S6: Complete the preparation and obtain a heterogeneous component with a novel interlaced overlapping structural interface.

[0057] The order in which different materials are written is determined by their melting temperatures. The material with the lower melting temperature is designated as A, and the material with the higher melting temperature is designated as B. Material A is written first, and material B is written later.

[0058] Material A and Material B can be any materials that can be heated and extruded using the same FDM equipment. The filament can be changed to Material B through a single heated nozzle to continue writing, thus repeating the process.

[0059] Alternatively, multiple heating nozzles can be used to switch the filament to material B and continue writing, thus repeating the process.

[0060] The wire pitch L mentioned in steps S2, S3 and S4 is set as follows: Where R is the wire feeding radius, to ensure the quality of material forming.

[0061] The misalignment rate μ and coincidence rate mentioned in steps S2, S3 and S4 The synergistic relationship between them is controlled by the following inequality formula: To prevent over-melting or weak bonding at the interface, and to prevent excessively large interface spans from affecting the performance of single material regions, while optimizing interface bonding performance, so that interface strength and fatigue performance reach the best state.

[0062] Example 1: As Figure 4 The image shows a tensile member having the novel interlaced structure of dissimilar filament bonding interfaces described in this invention, which is achieved through the manufacturing method and process described in this invention.

[0063] like Figure 4 The side view of the tensile specimen shown shows the connection interface using... Figure 1 The implementation method shown.

[0064] The novel heterogeneous filament bonding interface with overlapping structure has the characteristics of overlapping interface structure.

[0065] In this embodiment, the interface is along the additive height direction, with PLA material on one side and TPU material on the other side. The filament direction of different additive layers forms a 0° angle with the interface direction, and the filament angle between continuous additive layers is also 0°.

[0066] Specifically, the staggered feature refers to the misalignment between the material boundary line in the Nth additive layer and the material boundary lines in the (N-1)th and N+1th layers, respectively, with the material boundary lines in the (N-1)th and N+1th layers lying on the same three-dimensional plane. The misalignment amount is set as μL, where μ is the defined misalignment rate, and L is the horizontal parallel distance between two adjacent filaments of the same material within the same additive layer.

[0067] In this embodiment, μ is 0.5, the nozzle diameter is 0.4 mm, the wire feeding radius R is 0.2 mm, and L is 0.457 mm.

[0068] Specifically, the overlap feature refers to the amount of material rewriting where, within the same additive layer, the TPU material penetrates a certain depth into the PLA region at the dissimilar material interface. The rewriting amount is set as follows: , The rewrite rate is undefined.

[0069] In this embodiment, It is 0.5.

[0070] This embodiment follows Figure 3 The manufacturing method and process shown can be realized.

[0071] A manufacturing method for preparing the novel interface structure, using FDM additive manufacturing. The specific method involves: defining materials A and B; first writing the first layer of material A; then changing the filament to write the first layer of material B; with material B and material A overlapping at the interface. Write the Nth layer of material A (N=2,3,...,N), which extends beyond the edge of the (N-1)th layer of material A. Distance is the amount of misalignment; when writing the Nth layer of material B (N=2,3,...,N), the overlap at the boundary with material A is the amount of overlap. Distance is the amount of rewriting; repeating this pattern creates a new type of interface for connecting dissimilar materials with an overlapping and interlocking structure.

[0072] Specifically, the order in which each layer of material is written is determined by the melting temperatures of the two materials. The material with the lower melting temperature is designated as A, and the material with the higher melting temperature is designated as B. Material A is written first, followed by material B. Material A and material B can be any materials that can be heated and extruded using the same FDM equipment. After each layer of material A is written, the material can be switched to material B through a single heating nozzle and the writing can continue in a reciprocating manner. Alternatively, the material can be switched to material B through multiple heating nozzles and the writing can continue in a reciprocating manner.

[0073] In this embodiment, material A is PLA and material B is TPU, which is achieved by changing the filament with a single nozzle in the FDM system; the heated bed temperature is set to 55 degrees Celsius and the nozzle temperature is 220 degrees Celsius.

[0074] A manufacturing process for designing and fabricating the novel interface structure described above. The specific process steps of this embodiment include:

[0075] Step S1: Set the materials PLA and TPU, writing the PLA material first and the TPU material last;

[0076] Step S2: First, write the first layer of material PLA, then change the filament to write the first layer of material TPU. The TPU and PLA materials overlap at the interface. ;

[0077] Step S3: Write the Nth layer of material PLA (N=2,3,...,N), extending beyond the edge of the (N-1)th layer of material PLA region. Distance is the amount of misalignment;

[0078] Step S4: Write the overlap amount between the Nth layer material TPU (N=2,3,...,N) and the PLA material at the interface. Distance is the amount of rewriting;

[0079] Step S5: If N reaches the maximum value of the component model slice, stop writing and proceed to step 6; if N does not reach the maximum value, continue to prepare N+1 layers and repeat steps S3 and S4.

[0080] Step S6: Complete the preparation and obtain a heterogeneous component with a novel interlaced overlapping structural interface.

[0081] In this embodiment, using the described interface structure, manufacturing method, and preparation process, a material is prepared as follows: Figure 5 The dissimilar tensile specimens shown exhibit good density as verified by three-dimensional testing. Compared with ordinary dissimilar abrupt interfaces, the interfacial strength is increased by 75%, and the elongation at break and toughness are increased by 53%.

[0082] Example 2: As Figure 5 The image shows a compression shear member having the novel interlaced structure of dissimilar filament bonding interfaces described in this invention, which is realized through the manufacturing method and process described in this invention.

[0083] like Figure 5 The side view of the compression shear specimen shown shows the connection interface using... Figure 1 The implementation method shown.

[0084] In this embodiment, the interface is along the additive height direction, with PLA material on one side and PCL material on the other side. The filament direction of different additive layers forms a 0° angle with the interface direction, and the filament angle between consecutive additive layers is also 0°.

[0085] In this embodiment, μ is 0.5, the nozzle diameter is 0.4 mm, R is 0.2 mm, and L is 0.457 mm. It is 0.5.

[0086] This embodiment follows Figure 3 The manufacturing method and process shown can be realized.

[0087] In this embodiment, material A is PLA and material B is PCL, which is achieved by changing the wire through a single nozzle of the FDM system; the heated bed temperature is set to 55 degrees Celsius and the nozzle temperature is 240 degrees Celsius.

[0088] In this embodiment, using the described interface structure, manufacturing method, and preparation process, a material is prepared as follows: Figure 5 The dissimilar material compression-shear specimen shown exhibits good density as verified by three-dimensional testing. Compared with ordinary dissimilar material abrupt interface, the interfacial strength is increased by 56%, and the elongation at break and toughness are increased by 42%.

[0089] Example 3: As Figure 6 The image shows a tensile member having the novel interlaced structure of dissimilar filament bonding interfaces described in this invention, which is achieved through the manufacturing method and process described in this invention.

[0090] like Figure 6 The side view of the compression-tensile specimen shown shows the connection interface using... Figure 2 The implementation method shown.

[0091] In this embodiment, the interface is along the additive height direction, with PLA material on one side and TPU material on the other side. The angle between the filament direction of different additive layers and the interface direction alternates between 0° and 90°, and the filament angle between consecutive additive layers is 90°.

[0092] In this embodiment, μ is 0.6, the nozzle diameter is 0.2 mm, R is 0.1 mm, and L is 0.228 mm. It is 0.2.

[0093] This embodiment follows Figure 3 The manufacturing method and process shown can be realized.

[0094] In this embodiment, material A is PLA and material B is TPU, which is achieved through automatic filament changing of multiple nozzles in the FDM system; the heated bed temperature is set to 55 degrees Celsius and the nozzle temperature is 220 degrees Celsius.

[0095] In this embodiment, using the described interface structure, manufacturing method, and preparation process, a material is prepared as follows: Figure 4 The dissimilar tensile specimens shown exhibit good density as verified by three-dimensional testing. Compared to ordinary dissimilar abrupt interfaces, the interfacial strength is increased by 116%, and the elongation at break and toughness are increased by 37%. Example 4: As shown... Figure 7 The image shows a compression shear member having the novel interlaced structure of dissimilar filament bonding interfaces described in this invention, which is realized through the manufacturing method and process described in this invention.

[0096] like Figure 7 The side view of the compression shear specimen shown shows the connection interface using... Figure 2 The implementation method shown.

[0097] In this embodiment, the interface is along the additive height direction, with PLA material on one side and PCL material on the other side. The angle between the filament direction of different additive layers and the interface direction alternates between 0° and 90°, and the filament angle between consecutive additive layers is 90°.

[0098] In this embodiment, μ is 0.5, nozzle diameter is 0.2 mm, R is 0.1 mm, and L is 0.228 mm. It is 0.5.

[0099] This embodiment follows Figure 3 The manufacturing method and process shown can be realized.

[0100] In this embodiment, material A is PLA and material B is PCL, which is achieved through automatic wire changing of multiple nozzles in the FDM system; the heated bed temperature is set to 55 degrees Celsius and the nozzle temperature is 240 degrees Celsius.

[0101] In this embodiment, using the described interface structure, manufacturing method, and preparation process, a material is prepared as follows: Figure 7 The dissimilar material compression-shear specimen shown exhibits good density as verified by three-dimensional testing. Compared with ordinary dissimilar material abrupt interface, the interfacial strength is increased by 94%, and the elongation at break and toughness are increased by 43%. Example

[0102] like Figure 8 The image shows a bionic hand and joint with the novel heterogeneous filament bonding interface overlapping structure described in this invention, which is realized through the manufacturing method and process described in this invention.

[0103] like Figure 8 The image shown is a photograph of a bionic hand and a schematic diagram of its joint bending motion. The interface for connecting dissimilar materials uses... Figure 1 The implementation method shown.

[0104] In this embodiment, PLA is selected as material A and TPU as material B. PLA is used to manufacture the rigid finger, and TPU is used to manufacture the flexible joint. The biomimetic finger joint with both rigidity and flexibility transitions through different materials according to... Figure 3 The manufacturing method and process shown are realized. μ is 0.5, nozzle diameter is 0.2 mm, R is 0.1 mm, and L is 0.228 mm. It is 0.5.

[0105] Bending tests on the bionic joint show that, compared with ordinary heterogeneous abrupt interfaces, the failure critical bending angle of the interface structure of the present invention is increased by 3 times and the fatigue life is increased by 5 times, successfully meeting the service requirements of repeated bending of the bionic gripper joint.

[0106] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0107] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite interface overlapping structure, characterized in that: The structure has an interlaced interface structure feature; The interface is along the additive height direction, with material A on one side and material B on the other side. The direction of the fabric fibers on both sides of the interface is not restricted, the angle between the direction of the fabric fibers in the Nth additive layer and the N-1 and N+1th layers is not restricted, and the angle between the direction of the fabric fibers and the direction of the interface is not restricted and is within 90°. The interlacing feature of the interface refers to the fact that the boundary line of the dissimilar material in the Nth additive layer is misaligned with the boundary line of the dissimilar material in the N-1 and N+1 layers, and the boundary line of the dissimilar material in the N-1 and N+1 layers is on the same three-dimensional surface. The overlapping feature of the interface refers to the fact that in the same additive layer, material B penetrates into the region of material A by a certain amount of material rewriting at the interface between dissimilar materials. The interfacial overlapping structure includes interfacial misalignment and interfacial rewriting. The interfacial misalignment is set to μL, where μ is the defined misalignment rate and L is the horizontal parallel distance between two adjacent filaments of the same material within the same additive layer, i.e., the filament pitch. The interfacial rewriting is set to... , Undefined rewrite rate; The value of the wire pitch L is set by an inequality: Where R is the wire feeding radius, to ensure the quality of material forming; The value of the misalignment rate μ is set by an inequality: This is to ensure effective dispersion of interfacial stress and prevent excessively large interfacial spans from affecting the performance of single-material regions. The numerical inequality relating the rewrite rate φ is set as follows: This ensures active penetration and remelting at the interface and prevents overmelting or weak penetration at the interface. The misalignment rate μ and the overlap rate The value of is controlled collaboratively through the following inequality relationship: To optimize interface performance, the interface strength and fatigue performance are optimized to achieve the best state.

2. A method for manufacturing dissimilar filaments with an interlocking and overlapping interface structure, referring to the interlocking and overlapping interface structure described in claim 1, characterized in that: The steps of the method for manufacturing dissimilar filaments are as follows: Step S1: Set up materials A and B, write material A first, then write material B; Step S2: First write the first layer of material A, then change the filament and write the first layer of material B. The overlap between material B and material A at the interface will be used for copying. ; Step S3: Write the Nth layer of material A (N=2,3,...,N), extending beyond the edge of the (N-1)th layer of material A region. Distance is the amount of misalignment; Step S4: Write the Nth layer of material B (N=2,3,...,N), overlapping the copy amount with material A at the interface. Distance is the amount of rewriting; Step S5: When N reaches the maximum value of the component model slice, stop writing and proceed to step 6. If N does not reach the maximum value, continue to prepare N+1 layers and repeat steps S3 and S4. Step S6: Complete the preparation and obtain a heterogeneous component with a novel interlaced overlapping structural interface.

3. The method for manufacturing dissimilar filaments with an interlocking and overlapping interface structure according to claim 2, characterized in that: The order in which material A and material B are written for each layer is determined by their melting temperatures. The material with the lower melting temperature is designated as A, and the material with the higher melting temperature is designated as B. Material A is written first, and material B is written later.

4. The method for manufacturing dissimilar filaments with an interlocking and overlapping interface structure according to claim 2, characterized in that: Material A and Material B are set as arbitrary materials that are heated and extruded through the same FDM equipment.

5. The method for manufacturing dissimilar filaments with an interfacial overlapping structure according to claim 2, characterized in that: After each layer of material A is written, the filament can be changed to material B through a single heating nozzle to continue writing, thus repeating the process; alternatively, multiple heating nozzles can be used to change the filament to material B to continue writing, thus repeating the process.

6. The method for manufacturing dissimilar filaments with an interlocking and overlapping interface structure according to claim 2, characterized in that: When prepared using this method, the wire pitch L in steps S2, S3, and S4 is set as follows: Where R is the wire feeding radius, to ensure the quality of material forming.

7. The method for manufacturing dissimilar filaments with an interlocking and overlapping interface structure according to claim 2, characterized in that: When preparing heterogeneous material bonding interface structures using this method, the misalignment rate μ and overlap rate mentioned in steps S2, S3, and S4 are... The synergistic relationship between them is controlled by the following inequality formula: To prevent over-melting or weak bonding at the interface, and to prevent excessively large interface spans from affecting the properties of the single material region, while optimizing the interface bonding performance, so that the interface strength and fatigue performance reach the best state.

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