A method of additive manufacturing of a multi-structured conformal water channel cooling panel

Abstract

The application provides a complex lattice and solid interaction structure variable parameter additive manufacturing process method, comprising the following steps: obtaining a product structure characteristic model; based on the structure characteristics, the product is model split, and the structure is independently split according to the characteristics of different split structures, and the structure is divided into three parts: a functional entity part, a lattice lightweight structure part and a solid connection fulcrum part; laser parameters are set for each part, and forming is performed in sequence. According to the product structure characteristics, the product is divided into a functional entity part, a lattice lightweight part and a solid connection fulcrum part, the structure is independently split according to the structure characteristics of different split structures, the printing parameter is independently adapted, and the process method of simultaneous contact sintering fitting forming is adopted, so that the problem that complex structure forming parameters are difficult to uniformly adapt is solved.

Description

Technical Field

[0001] This invention relates to the field of laser additive manufacturing technology, and specifically to an additive manufacturing method for a multi-structure conformal water cooling plate. Background Technology

[0002] Laser Additive Manufacturing (LAM) is a novel manufacturing technology that uses a laser beam to heat metal powder or binder, depositing it layer by layer according to a 3D model design to form a part. This technology offers advantages such as moldlessness, high efficiency, and high precision, and can be used to produce parts with complex shapes and made of special materials.

[0003] Chinese patent application CN109848410A discloses an additive manufacturing aid method and apparatus for high-degree-of-freedom complex structural parts. The method includes: designing and optimizing the part structure to generate a corresponding three-dimensional solid model; establishing a suitable three-dimensional spatial positioning support structure based on the part's structure and shape; processing the part and the three-dimensional spatial positioning support structure together as the workpiece, using set processing parameters to process the raw material powder layer by layer into a dense solid, obtaining a unified entity composed of the three-dimensional spatial positioning support structure and the part; and removing the three-dimensional spatial positioning support structure from the unified entity to obtain the part. This application also provides a three-dimensional spatial positioning support structure with broad applicability.

[0004] However, with the rapid development of powder bed additive manufacturing technology, the difficulty in uniformly adapting forming parameters for complex structures often leads to problems during the printing process. These problems frequently arise due to parameter incompatibility between different types of structures, easily causing protrusions that break or damage the squeegee, ultimately resulting in scrapped printed products. These issues severely hinder the development of powder bed additive manufacturing technology towards high-quality forming of complex structures. Therefore, developing a variable-parameter additive manufacturing process capable of adapting to complex lattice and solid interactive structures is one of the most important problems that needs to be solved. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose a variable-parameter additive manufacturing process for complex lattice and solid interactive structures. By dividing the product into functional solid parts, lightweight lattice parts, and solid connection support parts according to the structural characteristics of different split structures, a process method is adopted that involves independent structural splitting, independent adaptation of printing parameters, and simultaneous contact sintering fitting forming to solve the problem of difficult uniform adaptation of forming parameters for complex structures.

[0006] To achieve the above objectives, this invention provides a variable-parameter additive manufacturing method for complex lattice and solid interactive structures, comprising the following steps:

[0007] Obtain the product structure and characteristics model;

[0008] Based on the structural features, the model is segmented; for the characteristics of different segmented structures, the structure is independently split, and the model is divided into three parts: functional entity part, lattice lightweight structure part, and entity connection fulcrum part.

[0009] Independent laser parameters are set for each part, and they are formed sequentially.

[0010] In some embodiments, conventional solid forming parameters are set for the functional solid portion, and laser scanning and filling are performed to form the solid portion.

[0011] In some embodiments, the forming parameters of the lightweight dot matrix structure are 50-100W lower than the laser power of the functional entity, and no contour scanning is performed on the lightweight dot matrix structure.

[0012] In some embodiments, for the solid connection fulcrum portion, the same laser power filling parameters as the functional solid portion are used, and the contour is not scanned to form the solid connection fulcrum portion.

[0013] In some embodiments, there is local overlap at the junctions of the functional entity portion, the lattice lightweight structure portion, and the entity connection fulcrum portion.

[0014] In some embodiments, the parameters include: fill speed, contour speed, fill power, contour power, fill spacing, and scan order.

[0015] In some embodiments, the functional entity portion, the lattice lightweight structure portion, and the entity connection fulcrum portion are embeddedly combined at their contact positions.

[0016] In some embodiments, the scanning sequence includes: scanning support, filling, and scanning contour.

[0017] The principle of laser additive manufacturing technology is to first create individual small blocks and then assemble them into the desired part. Specifically, one material is deposited onto another material, allowing computer-aided design (CAD) software to construct a 3D model. This model is then transferred to computer-aided manufacturing (CAM) software, converted into a machine-readable format, and finally connected to a laser additive manufacturing machine for printing. The laser additive manufacturing machine uses a laser beam to melt or sinter metal powder, forming a metal layer of a fixed shape. A new metal layer is then added on top until the desired shape is achieved.

[0018] This application targets products with complex dot matrix and solid interaction structures. Based on the product's structural characteristics, it divides the product into functional solid parts, lightweight dot matrix parts, and solid connection support parts. For the structural characteristics of different split structures, it adopts a process method of independent structural splitting, independent adaptation of printing parameters, and simultaneous contact sintering fitting to solve the problem of difficult uniform adaptation of forming parameters for complex structures.

[0019] Beneficial effects: The variable-parameter additive manufacturing method for complex lattice and solid interactive structures described in this invention has the following advantages compared with the prior art:

[0020] 1. The variable parameter additive manufacturing process for complex lattice and solid interactive structures provided by the present invention divides the product into functional solid parts, lattice lightweight parts and solid connection support parts according to the product's structural characteristics. For different split structures, the process method of independent structural splitting, independent adaptation of printing parameters and simultaneous contact sintering fitting is adopted to solve the problem of difficult uniform adaptation of forming parameters for complex structures.

[0021] 2. The present invention provides a variable parameter additive manufacturing forming process for complex lattice and solid interactive structures. By setting local overlaps at the junctions of each part in the model layout, the forming density of the bonding position is improved, which solves the problem of poor metallurgical compactness and density at the bonding boundaries of each part.

[0022] 3. The solid connection fulcrum part of the present invention uses the same laser power filling parameters as the solid, prohibits scanning contour, avoids excessive energy concentration due to repeated scanning of local structure, resulting in the formation of structural sintering protrusions and damage to the scraper;

[0023] 4. The present invention provides a method for separately reducing laser power and prohibiting contour scanning in the lightweight dot matrix structure, which effectively avoids the phenomenon of a large number of protrusions and breakage in the structure, and achieves high-quality forming of complex dot matrix structures. Attached Figure Description

[0024] In the diagram:

[0025] Figure 1 This is a flowchart of an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram illustrating the structural breakdown of an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the embedded connection structure at the contact positions of each independent structure in an embodiment of the present invention;

[0028] Figure 4 -a represents a rendering of existing technology. Figure 4 -b is a rendering of an embodiment of the present invention;

[0029] Among them, 1. functional entity part, 2. lattice lightweight structure, 3. entity connection fulcrum, 4. local overlap. Detailed Implementation

[0030] The present invention will be further explained below with reference to the accompanying drawings.

[0031] like Figure 1 The flowchart shown is a method for variable-parameter additive manufacturing of complex lattice and solid interactive structures, specifically including the following steps:

[0032] Obtain a product structure characteristic model; the product model includes the proportion, shape, position, etc. of each part, as well as the sum of the relationships between each part.

[0033] Based on the structural features, the model is segmented; for the characteristics of different segmented structures, the structure is independently split, and the model is divided into three parts: functional entity part, lattice lightweight structure part, and entity connection fulcrum part.

[0034] Independent laser parameters are set for each part, and the parts are formed sequentially. The parameters include: fill speed, contour speed, fill power, contour power, fill spacing, and scanning sequence.

[0035] In some embodiments, conventional solid forming parameters are set for the functional solid part 1, and laser scanning filling is performed to form the solid part 1;

[0036] The forming parameters of the lightweight dot matrix structure 2 are 50-100W lower than the laser power of the functional solid part. The lightweight dot matrix structure 2 is formed without contour scanning.

[0037] For the solid connection fulcrum part 3, the same laser power filling parameters as the functional solid part are used, and the contour is not scanned to form the solid connection fulcrum part 3.

[0038] It should be noted that, for different structural characteristics, there is a local overlap at the junction of the functional entity part 1, the lattice lightweight structure part 2, and the entity connection support part 3.

[0039] The functional entity part 1, the dot matrix lightweight structure part 2, and the entity connection fulcrum part 3 are embedded and combined at their contact positions. Example

[0040] The present application describes a variable-parameter additive manufacturing method for complex lattice and solid interactive structures, which is used to form a partial structural component of a multi-structure conformal water cooling plate.

[0041] The method includes the following steps:

[0042] Obtain the structural feature model of the multi-structure conformal water channel cooling plate, such as Figure 2 As shown;

[0043] Based on the structural features, the multi-structure conformal water cooling plate is disassembled. According to the characteristics of different split structures, the structure is independently disassembled and divided into three parts: functional entity part 1, lattice lightweight structure part 2, and entity connection support part 3.

[0044] It should be noted that, given the independent parameters and independent forming of each part, the joint boundary suffers from issues such as loose metallurgical bonding and poor density. Therefore, this application embeds the contact positions of each independent structure into the model layout, such as... Figure 3 As shown, a local overlap of 4 is set separately at the junction of each part to improve the forming density of the joint position and solve the problem of poor metallurgical compactness and poor density at the joint boundary;

[0045] Functional entity part 1 is set with normal solid forming parameters, that is, laser scanning filling and contouring are performed simultaneously. The parameters are set as follows: filling speed 1000mm / s, contouring speed 800mm / s, filling power 250w, contouring power 85w, filling spacing 0.12mm, and the scanning sequence is: first scan the support, then fill, and finally scan the contour to complete the forming of functional entity part 1.

[0046] In some embodiments, the method of reducing laser power and not performing contour scanning for the dot matrix lightweight structure part 2 separately avoids the phenomenon of a large number of protrusions and breakage in the structure. The parameters are set as follows: filling speed 1000mm / s, filling power 160w, filling spacing 0.12mm, and scanning sequence is: first scan the support and then fill.

[0047] In some embodiments, the solid connection fulcrum portion 3 uses the same laser power filling parameters as the solid and does not scan the contour to avoid excessive energy concentration due to repeated scanning of local structures, which could lead to the formation of sintering protrusions and damage to the scraper. The parameters are set as follows: filling speed 1000mm / s, filling power 200w, filling spacing 0.12mm, and the scanning sequence is: first scan the support and then fill.

[0048] Product molding.

[0049] Molding effect as Figure 4 As shown, Figure 4 -a is a diagram showing the forming effect of a single-parameter structure. Figure 4 -b is an effect diagram based on an embodiment of this application. The comparison clearly reflects the forming effect of this process method.

[0050] The variable-parameter additive manufacturing method for complex lattice and solid interactive structures implemented by this invention effectively solves the problem of parameter mismatch between different types of structures during the printing process, which easily leads to protrusions, scrapping, and damage to the squeegee, ultimately resulting in the scrapping of printed products. It achieves high-quality forming of complex lattice and solid interactive structures through variable-parameter additive manufacturing.

[0051] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method of additive manufacturing of a multi-structured conformal water channel cooling panel, characterized by, The method comprises the steps of: obtaining a product structure feature model; segmenting and splitting the model based on the structure features; for the characteristics of different split structure, independently splitting the structure, and dividing the model into three parts: a functional entity part, a dot array lightweight structure part, and an entity connecting fulcrum part; setting a conventional entity forming parameter for the functional entity part, performing laser scanning filling, and forming the entity part; for the dot array lightweight structure part, the forming parameter is 50-100 W lower than the laser power of the functional entity part, the dot array lightweight structure part is not subjected to contour scanning, and the dot array lightweight structure part is formed; for the entity connecting fulcrum part, the same laser power filling parameter as the functional entity part is adopted, and the entity connecting fulcrum part is not subjected to scanning contour, and the entity connecting fulcrum part is formed; the parameters include: filling speed, contour speed, filling power, contour power, filling interval, and scanning sequence; independent laser parameters are set for each part, and the parts are formed in sequence.

2. A method of additive manufacturing of a multi-structured conformable water channel cooling panel according to claim 1, wherein, the functional entity part, the dot array lightweight structure part, and the entity connecting fulcrum part are locally overlapped at the interfaces between the parts.

3. The method of claim 1, wherein, the functional entity part, the dot array lightweight structure part, and the entity connecting fulcrum part are embeddedly combined at the contact positions of the parts.

4. The method of claim 1, wherein, the scanning sequence includes: scanning support, filling, and scanning contour.

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