Steel-copper multi-material topological optimization radiator and manufacturing method thereof

Abstract

The invention belongs to the field of laser powder bed fusion, and discloses a steel-copper multi-material topological optimization structure radiator and a manufacturing method thereof. According to the method, a topological pattern of a two-dimensional radiator is obtained through a topological optimization technology; s2, constructing a radiator fin three-dimensional model with an inner pipeline and radiator fins based on the topological pattern obtained in S1; and S3, the three-dimensional model obtained in the S2 is subjected to layered slicing and machining forming through integrated LPBF equipment, and the steel-copper multi-material topological optimization structure radiator is obtained. Therefore, the specific implementation of the invention comprises the steps of establishing a topological optimization model, establishing a density model based on SIMP, and processing and forming laser powder bed fusion technical equipment, the steel-copper multi-material radiator is prepared, excellent heat dissipation performance is kept under high heat flux density, the structure is light, the design is flexible, and different application requirements are met.

Description

Technical Field

[0001] The present invention belongs to the technical field related to laser powder bed fusion, and more specifically, relates to a steel-copper multi-material topology optimization structure radiator and a manufacturing method thereof. Background Art

[0002] With the continuous improvement of the performance of electronic devices, the heat dissipation problem has become one of the key factors restricting the device performance. Active cooling of hypersonic aircraft combustion chambers, design of directional ventilation cooling channels for turbogenerators, heat flux density cooling of integrated circuit chips, etc., efficient heat dissipation is an important factor to ensure the stable operation of the device and extend its service life. Traditional radiators, due to the limitations of their structural design, often cannot meet the growing heat dissipation requirements. These traditional radiators have deficiencies in heat conduction efficiency and mechanical strength, especially in high heat flux density and complex thermal environments. For example, copper, as a material with high thermal conductivity, is usually used to improve heat conduction efficiency. However, when copper is combined with other metals (such as stainless steel), due to the differences in physical and chemical properties, cracks often occur at the interface, increasing the interfacial thermal resistance and hindering heat conduction.

[0003] Currently, traditional manufacturing methods such as casting and machining often have difficulty in solving the heat dissipation problem caused by the structural distribution design of devices by preparing complex geometric structures. Especially for the manufacturing of multi-material complex heterogeneous structures, it is necessary to simultaneously solve the problems of heat conduction efficiency and mechanical strength of the multi-material interface bonding.

[0004] Laser Powder Bed Fusion (LPBF), as an additive manufacturing technology, has attracted attention for its high precision, flexibility, and ability to manufacture complex structures. The laser powder bed fusion technology first constructs a three-dimensional model, uses a high-energy laser beam to melt metal powder, and then stacks layer by layer to achieve the precision forming of complex parts. However, for the structural preparation requirements of multi-material radiators, based on the above-mentioned precision forming, there are still problems such as the design of the optimal heat transfer path, the complex structural design of heat dissipation materials and support materials, and the interfacial bonding of bimetallic materials that need to be solved urgently.

[0005] Therefore, developing a method that can improve heat conduction efficiency and enhance mechanical strength is of great significance for the heat dissipation management of modern electronic devices. Summary of the Invention

[0006] In view of the above deficiencies or improvement requirements of the prior art, the present invention provides a steel-copper multi-material topology-optimized radiator and its manufacturing method. The purpose is to design the best heat dissipation path of the flow channel through the topology optimization method, design the copper material with good thermal conductivity on the best heat conduction path to enhance the heat dissipation performance, and fill the steel material in other places of the fins to support and improve the mechanical strength. At the same time, the laser powder bed fusion technology is adopted to integrally form the fins of the complex-structured steel-copper multi-material radiator, providing the best heat dissipation performance while ensuring the mechanical strength, thereby solving the problems of insufficient heat conduction efficiency and mechanical strength in traditional radiators.

[0007] To achieve the above object, the present invention provides a manufacturing method of a steel-copper multi-material topology-optimized radiator, including the following steps:

[0008] S1: Construct a topology optimization model of the heat dissipation material; with the lowest average temperature of the two-dimensional design domain of the radiator as the design goal and the volume fraction of the heat dissipation material as the design variable, optimize through the topology optimization model to obtain the optimized design value of the volume fraction of the heat dissipation material, and the result is expressed as the two-dimensional topology pattern of the radiator fins.

[0009] S2: Based on the two-dimensional topology pattern obtained in S1, construct a three-dimensional model of the radiator with internal pipes and radiator fins; wherein, the material distribution in the three-dimensional model of the radiator includes: the heat dissipation material in the radiator fins is copper, and the support material except the heat dissipation material in the radiator fins and the material used for the internal pipes are both steel materials.

[0010] S3: Layer and slice the three-dimensional model obtained in S2 through an integrated LPBF device and process it to form a steel-copper multi-material topology-optimized structure radiator.

[0011] As a preference of the present invention, the construction of the topology optimization model of the physical properties of the heat dissipation material includes:

[0012] Construct the topology optimization model of the heat dissipation material according to the two-dimensional design domain of the radiator, boundary conditions and physical properties of the heat dissipation material, and set the center of the two-dimensional design domain of the radiator as the heat source and the outer ring as the low-temperature boundary.

[0013] As a preference of the present invention, the two-dimensional design domain of the radiator is in a circular ring shape.

[0014] As a preference of the present invention, the topology optimization model of the heat dissipation material is as follows:

[0015]

[0016] Wherein, k effis the effective thermal conductivity, with the unit of (W / (m·K)); T is the temperature field, with the unit of K; q ′ eff is the effective volume heat generation rate, with the unit of W / m 3 ; V is the total volume of the two-dimensional design domain, with the unit of m3; n is the number of discrete elements in the two-dimensional design domain, x j is the design variable of the j-th element; φ max is the maximum volume fraction applied in the volume inequality constraint.

[0017] As a preference of the present invention, in the step (3), when processing and forming by an integrated LPBF device, the copper and steel materials required in the three-dimensional model are fed with powder respectively.

[0018] As a preference of the present invention, in the step (3), the process parameters for the processing and forming are set as follows:

[0019] When processing the heat dissipation material, the laser power is 400 - 450W, the scanning speed is 500 - 600mm / s, the scanning spacing is 80 - 120μm, and the scanning layer thickness is 30 - 50μm; when processing the materials of other parts, the laser power is 320 - 360W, the scanning speed is 500 - 700mm / s, the scanning spacing is 100 - 40μm, and the scanning layer thickness is 30 - 50μm; the scanning strategy is strip scanning, the angle is 67°, and layer-by-layer scanning is performed.

[0020] As a preference of the present invention, when processing the heat dissipation material, the laser power is 420W, the scanning speed is 550mm / s, the scanning spacing is 100μm, and the scanning layer thickness is 50μm; when processing the materials of other parts, the laser power is 350W, the scanning speed is 650mm / s, the scanning spacing is 120μm, and the scanning layer thickness is 40μm.

[0021] In order to achieve the above purpose, the present invention provides a steel-copper multi-material topology optimization structure radiator prepared by the manufacturing method as described in the present invention.

[0022] Generally speaking, compared with the prior art by the above technical solutions conceived by the present invention, the following technical advantages are mainly possessed:

[0023] 1. The present invention designs the optimal heat dissipation path of the flow channel through a topology optimization method, designs copper materials with good thermal conductivity on the optimal heat conduction path to enhance the heat dissipation performance, and fills other parts of the fins with steel materials for support to improve the mechanical strength. At the same time, the laser powder bed fusion technology is adopted, which can integrally form the fins of the complex-structured steel-copper multi-material radiator, providing the best heat dissipation performance while ensuring the mechanical strength. Among them, the multi-material topology optimization design significantly improves the heat conduction efficiency of the radiator, enabling the radiator to maintain excellent heat dissipation performance under high heat flux density; the steel-copper multi-material structure provides higher mechanical strength, and the additive manufacturing method reduces material waste while ensuring the integrity of the structure, realizing the lightweight of the radiator; the laser powder bed fusion technology provides the ability to manufacture complex structures, making the radiator design more flexible and capable of adapting to different application requirements. Therefore, with the support of the above two technologies, the steel-copper multi-material radiator is prepared, which can simultaneously solve the problems of insufficient heat conduction efficiency and mechanical strength existing in traditional radiators.

[0024] 2. Preferably, a topology optimization model of the heat dissipation material is constructed according to the two-dimensional design domain, boundary conditions of the radiator, and physical properties of the heat dissipation material, and the center of the two-dimensional design domain of the radiator is set as the heat source and the outer ring as the low-temperature boundary, so that heat is transferred from the center to the surroundings.

[0025] 3. Preferably, the heat dissipation material of the radiator is copper material, and the structures of other parts, especially the support parts, are steel materials, enabling the radiator to withstand greater thermal stress while being able to bear greater mechanical loads.

[0026] 4. Preferably, when performing topology optimization, the two-dimensional design domain is in the shape of a ring, which is beneficial to heat dissipation.

[0027] In summary, the specific implementation of the method of the present invention includes establishing a topology optimization model, a density model based on SIMP, and the processing and forming of a laser powder bed fusion technology device, preparing a steel-copper multi-material radiator, achieving excellent heat dissipation performance under high heat flux density, lightweight structure, flexible design, and adapting to different application requirements. Description of the Drawings

[0028] Figure 1 Fins of the steel-copper multi-material topology optimization radiator according to an example of the present invention;

[0029] Figure 2 Steel-copper multi-material topology optimization radiator according to an example of the present invention;

[0030] Figure 3 Traditional aluminum alloy material radiator of the comparative example of the present invention;

[0031] Figure 4 Heat dissipation performance comparison chart of the examples and comparative examples of the present invention;

[0032] Figure 5 This is a comparison chart of the compression performance of the examples and comparative examples of the present invention.

[0033] In all the drawings, the same reference numerals are used to represent the same elements or structures, where:

[0034] 11 - Inner pipe of the radiator; 12 - Topologically optimized heat dissipation tree-shaped fins; 13 - Steel structure support organization; 21 - Inner pipe of the radiator; 22 - Multi-material heat dissipation fins; 31 - Inner pipe of the radiator; 32 - Aluminum alloy heat dissipation fins. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] The copper used in the present invention is CuSn10, and the steel is 316L. And the raw materials or reagents are all commercially available, of commercial grade, and used according to the received standards. The equipment used for the laser powder bed fusion technology referred to in the present invention is the RC-LDM8060 multi-material laser additive manufacturing equipment. The scientific and technical terms and abbreviations used in the present invention have the meanings commonly understood by those skilled in the art.

[0037] The steel-copper multi-material topologically optimized radiator to be designed and prepared in the present invention is composed of an inner pipe 11 of the radiator, a topologically optimized heat dissipation tree-shaped fin 12, a steel structure support organization 13 and a radiator housing. The inner pipe 11 of the radiator has the same diameter as the pipe of the target heat dissipation device and can be smoothly and tightly connected. When using the radiator, it only needs to be connected to the pipe of the target heat dissipation device.

[0038] Among them, the material selected for the topologically optimized heat dissipation tree-shaped fin 12 is CuSn10, and the materials selected for the inner pipe 11 of the radiator and the steel structure support organization 13 are 316L powder. The inner pipe 11 of the radiator, the topologically optimized heat dissipation tree-shaped fin 12, and the steel structure support organization are prepared by the RC-LDM8060 multi-material laser additive manufacturing equipment, and powder feeding is carried out separately for the CuSn10 part and the 316L part in the three-dimensional model, and finally integrated forming is completed.

[0039] Specifically, an example of the process for integrally forming the multi-material topologically optimized radiator of the present invention by using the laser powder bed fusion technology is as follows:

[0040] The present invention provides a manufacturing method for a steel-copper multi-material topology-optimized radiator, comprising the following steps:

[0041] S1: Establishment of the topological pattern of the two-dimensional radiator

[0042] Determine the two-dimensional design domain of the radiator; determine the thermophysical properties of the high heat dissipation material such as the thermal conductivity (copper material in the present invention), construct a heat dissipation topology optimization model, establish the corresponding equations, and input them into the topology optimization software; take the lowest overall average temperature within the entire two-dimensional design domain as the design goal, take the volume fraction of the high heat dissipation material as the design variable, optimize the volume fraction of the high heat dissipation material through the above-mentioned topology optimization model, and finally obtain the optimal volume fraction design value of the high heat dissipation material, and the result is expressed as the two-dimensional topological pattern of the radiator fins.

[0043] S2: Establishment of the three-dimensional model of the two-dimensional radiator

[0044] Based on the two-dimensional topological pattern obtained in S1, use 3D modeling software such as UG to stretch and form a three-dimensional model of the radiator fins with internal pipes and radiator fins; specifically, in the gap part between the two-dimensional design domain and the two-dimensional topological pattern (the mechanical load-bearing part of the steel material), stretch to form the mechanical load-bearing part to obtain the three-dimensional model of the radiator fins; stretch the generated topology optimization two-dimensional model as the fins, hollow out the center as the heat source, and generate a ring around the heat source and stretch it as the internal pipe; connect the radiator fins with the internal pipes, and the fins are arrayed along the internal pipes to jointly form the radiator three-dimensional model. At the same time, the material distribution in the radiator three-dimensional model includes: the heat dissipation material filled after stretching the two-dimensional topological pattern into a three-dimensional state in the radiator fins, and the support material used for other parts in the radiator three-dimensional model except for the parts formed by stretching the two-dimensional topological pattern into a three-dimensional state.

[0045] S3: Perform layer slicing on it through an integrated LPBF device, and process and form the steel-copper multi-material topology-optimized radiator to obtain the steel-copper multi-material topology-optimized structure radiator.

[0046] In some embodiments, construct a topology optimization model of the heat dissipation material according to the two-dimensional design domain of the radiator, boundary conditions, and physical properties of the heat dissipation material, and set the center of the two-dimensional design domain of the radiator as the heat source and the outer ring as the low-temperature boundary.

[0047] In some embodiments, use a two-dimensional ring as the two-dimensional design domain

[0048] In some embodiments, the construction of the heat dissipation topology optimization model is specifically:

[0049] Build a topology optimization model and set the corresponding design domain boundaries and initial parameters to minimize the average temperature in the defined volume; take the temperature of the heat dissipation topology optimization model under volume fraction constraint as the optimization objective, establish a topology optimization density model based on SIMP, adjust the target volume fraction, and use the heat dissipation topology optimization density model to obtain the mapping between the volume factors of two different materials and two-dimensional coordinates.

[0050] The topology optimization model of the heat dissipation material is as follows:

[0051]

[0052] Among them, k eff is the effective thermal conductivity, with the unit of (W / (m·K)); T is the temperature field, with the unit of K; q ′ eff is the effective volume heat generation rate, with the unit of W / m 3 ; V is the total volume of the two-dimensional design domain, with the unit of m 3 ; n is the number of discrete elements in the two-dimensional design domain, x j is the design variable of the j-th element; φ max is the maximum volume fraction (the ratio of the volume of the high thermal conductivity material to the total volume V) imposed in the volume inequality constraint. Considering the specific amounts of two (insulating and conductive) materials in the given volume V, the average temperature in the volume V is minimized;

[0053] The SIMP interpolation index method is as follows:

[0054]

[0055] Among them, the subscripts 0 and 1 respectively represent that the two different materials have different thermal conductivities, q ′ eff is the effective volume heat generation rate, with the unit of W / m 3 ; q ′ 0 is the volume heat generation rate, with the unit of W / m 3 , k 0 is the thermal conductivity; k eff is the effective thermal conductivity, with the unit of (W / (m·K)); x j is the design variable of the j-th element.

[0056] In some embodiments, a three-dimensional model of the radiator is constructed as follows:

[0057] Export the mapping of the two-dimensional coordinates to 3D modeling software such as UG to stretch and generate three-dimensional structural components, output them in STL format, and input them into the LPBF device for processing and forming.

[0058] In some embodiments, the LPBF printing process is as follows:

[0059] (1) The 316L and CuSn10 powders obtained by gas atomization are respectively ball-milled to control the powder particle size within 15 - 53 μm. The ball-milled powders are placed in an oven and dried at 60 - 80 °C for 3 - 4 h to obtain the raw powders for the laser powder bed fusion technology;

[0060] (2) The 316L plate is processed into a printing substrate with a thickness of 2 cm and preheated at 200 °C;

[0061] (3) The forming cavity is deoxidized to control the internal oxygen content below 200 ppm;

[0062] (4) LPBF forming is carried out in an environment of pure argon atmosphere. The specific process parameters are set as follows: When processing 316L, the laser power is 320 - 360 W, the scanning speed is 500 - 700 mm / s, the scanning spacing is 100 - 40 μm, and the scanning layer thickness is 30 - 50 μm; When processing CuSn10, the laser power is 400 - 450 W, the scanning speed is 500 - 600 mm / s, the scanning spacing is 80 - 120 μm, and the scanning layer thickness is 30 - 50 μm. The scanning strategy is strip scanning, the angle is 67°, and layer-by-layer scanning is performed to obtain high-strength multi-material parts.

[0063] Preferably, when processing 316L, the laser power is 350 W, the scanning speed is 650 mm / s, the scanning spacing is 120 μm, and the scanning layer thickness is 40 μm; When processing CuSn10, the laser power is 420 W, the scanning speed is 550 mm / s, the scanning spacing is 100 μm, and the scanning layer thickness is 50 μm.

[0064] The above method will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following embodiments are only used to explain the present invention, and the scope of protection of the present invention is not limited thereto.

[0065] Example 1: A design and manufacturing method for a steel-copper multi-material topology-optimized radiator provided by the basic invention is as follows: The heat dissipation topology optimization model and SIMP interpolation index method involved are designed according to the above specific formulas.

[0066] Thus, the fins of the steel-copper multi-material topology-optimized radiator obtained refer to Figure 1 , and the three-dimensional model of the steel-copper multi-material topology-optimized radiator obtained is as Figure 2 shown.

[0067] The LPBF printing process is as follows:

[0068] (1) The 316L and CuSn10 powders obtained by gas atomization method were respectively ball-milled to control the powder particle size within 15 - 53 μm. The ball-milled powders were placed in an oven and dried at 60 °C for 4 h to obtain the raw powders for laser powder bed fusion technology.

[0069] (2) The 316L sheet was processed into a printing substrate with a thickness of 2 cm and preheated at 200 °C.

[0070] (3) The forming cavity was deoxidized to control the internal oxygen content below 200 ppm.

[0071] (4) LPBF forming was carried out in an environment of pure argon atmosphere. The specific process parameters were set as follows: When processing 316L, the laser power was 350 W, the scanning speed was 650 mm / s, the scanning spacing was 120 μm, and the scanning layer thickness was 40 μm; when processing CuSn10, the laser power was 420 W, the scanning speed was 550 mm / s, the scanning spacing was 100 μm, and the scanning layer thickness was 50 μm. The scanning strategy was strip scanning, the angle was 67°, and layer-by-layer scanning was performed to obtain high-strength multi-material parts.

[0072] Comparative Example 1: After the radiator was three-dimensionally modeled by traditional methods, a manufacturing method was designed in combination with the LPBF printing process, as shown below:

[0073] S1: The fin radiator was three-dimensionally modeled according to the existing technology (as shown in Figure 3 ), output in STL format, input into the LPBF equipment, and layer-by-layer sliced. The fin radiator was processed and formed with the same processing parameters as above.

[0074] Furthermore, the LPBF printing process is detailed as follows:

[0075] (1) The AlMgScZr powder obtained by gas atomization method was ball-milled to control the powder particle size within 15 - 53 μm. The ball-milled powders were placed in an oven and dried at 60 °C for 4 h to obtain the raw powders for laser powder bed fusion technology.

[0076] (2) The aluminum alloy sheet was processed into a printing substrate with a thickness of 2 cm and preheated at 200 °C.

[0077] (3) The forming cavity was deoxidized to control the internal oxygen content below 200 ppm.

[0078] (4) LPBF forming is carried out in an environment of pure argon atmosphere, and the specific process parameter settings are as follows: When processing 316L, the laser power is 350W, the scanning speed is 650mm / s, the scanning spacing is 120μm, and the scanning layer thickness is 40μm; when processing AlMgScZr, the laser power is 350W, the scanning speed is 1000mm / s, the scanning spacing is 120μm, and the scanning layer thickness is 50μm; the scanning strategy is strip scanning, the angle is 67°, and high-strength multi-material parts are obtained by layer-by-layer scanning.

[0079] The radiators formed in Example 1 and Comparative Example 1 are respectively subjected to heat dissipation experiments, heat dissipation simulation experiments and compression performance experiments. From Figure 4 It can be seen that the heat dissipation simulation performance of the topologically optimized multi-material radiator in Example 1 of the present invention is significantly better than that of the traditional aluminum alloy fin radiator. The measured heat dissipation performance of the topologically optimized multi-material radiator is 15% higher than that of the traditional aluminum alloy fin radiator; the compression performance of the topologically optimized multi-material radiator is 60% higher than that of the traditional aluminum alloy fin radiator.

[0080] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the present invention and its equivalent technologies, the present invention also intends to include these changes and modifications. The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the scope of protection is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the scope of protection of the present invention.

Claims

1. A method for manufacturing a steel-copper multi-material topologically optimized structure heat sink, characterized in that: The steps include: S1: constructing a topology optimization model for heat dissipation materials; taking the lowest average temperature in the two-dimensional design domain of the heat sink as the design target, taking the volume fraction of the heat dissipation material as the design variable, optimizing through the topology optimization model, obtaining an optimized design value of the volume fraction of the heat dissipation material, and the result is expressed as a two-dimensional topological pattern of the heat sink fins; S2: Based on the two-dimensional topological pattern obtained in S1, a three-dimensional model of a radiator with an inner pipe and radiator fins is constructed; wherein the material distribution in the three-dimensional model of the radiator includes: the heat dissipation material in the radiator fins is copper, and the supporting material in the radiator fins other than the heat dissipation material and the material used for the inner pipe are all steel materials; S3: The three-dimensional model obtained in S2 is sliced ​​and processed by an integrated LPBF device to obtain a steel-copper multi-material topologically optimized structure heat sink.

2. The method for manufacturing a steel-copper multi-material topology optimized structure heat sink according to claim 1, characterized in that: The topology optimization model for constructing the physical properties of the heat dissipation material includes: A topological optimization model of the heat dissipation material is constructed according to the two-dimensional design domain of the heat sink, boundary conditions and physical properties of the heat dissipation material, and the center of the two-dimensional design domain of the heat sink is set as a heat source and the outer circle is set as a low-temperature boundary.

3. The method for manufacturing a steel-copper multi-material topology optimized structure heat sink according to claim 1, characterized in that: The two-dimensional design domain of the radiator is in the shape of a ring.

4. The method for manufacturing a steel-copper multi-material topology optimized structure heat sink according to claim 1, characterized in that: The topology optimization model of the heat dissipation material is as follows: Among them, k eff is the effective thermal conductivity, in units of (W / (m·K)); T is the temperature field, in units of K; q ′ eff is the effective volume heat generation rate, in W / m 3 ; V is the total volume of the two-dimensional design domain, in m 3 ; n is the number of discrete units in the two-dimensional design domain, x j is the design variable of the jth unit; φ max is the maximum volume fraction imposed in the volume inequality constraint.

5. The method for manufacturing a steel-copper multi-material topology optimized structure heat sink according to claim 1, characterized in that: In the step (3), when the integrated LPBF equipment is used for processing and forming, the copper and steel materials required in the three-dimensional model are fed into powder respectively.

6. The method for manufacturing a steel-copper multi-material topology optimized structure heat sink according to claim 1, characterized in that: In the step (3), the process parameters of the processing and forming are set as follows: When processing heat dissipation materials, the laser power is 400-450W, the scanning speed is 500-600mm / s, the scanning spacing is 80-120μm, and the scanning layer thickness is 30-50μm; when processing other parts of the material, the laser power is 320-360W, the scanning speed is 500-700mm / s, the scanning spacing is 100-40μm, and the scanning layer thickness is 30-50μm; the scanning strategy is strip scanning, the angle is 67°, and scanning is performed layer by layer.

7. The method for manufacturing a steel-copper multi-material topology optimized structure heat sink according to claim 6, characterized in that: When processing heat dissipation materials, the laser power is 420W, the scanning speed is 550mm / s, the scanning spacing is 100μm, and the scanning layer thickness is 50μm; when processing other parts of the material, the laser power is 350W, the scanning speed is 650mm / s, the scanning spacing is 120μm, and the scanning layer thickness is 40μm.

8. A steel-copper multi-material topologically optimized structure heat sink manufactured by the manufacturing method according to any one of claims 1 to 7.

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