Design method, system and terminal of special-section pipeline based on additive manufacturing

Abstract

The method, system and terminal for designing special-section pipelines based on additive manufacturing of the present invention design special-section pipelines by combining the initial design parameters of the circular cross-section multi-channel structure, which can ensure that the pipeline streamline is in the horizontal direction without adding internal support and can be directly printed, and the geometric parameters of the special-section have little effect on the flow characteristics of the fluid in the microchannel, and have engineering application value. Compared with the multi-channel structure obtained by traditional preparation technology, the present invention can reduce the weight of the multi-channel structure, and also reduce the volume of the multi-channel structure and realize an integrated design.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a design method, system and terminal for special-section pipelines based on additive manufacturing. Background Art

[0002] Additive manufacturing (AM) technology is a new manufacturing technology developed in the late 1980s. In recent years, AM has developed rapidly. It has been widely used in industry because it gives designers great design freedom and has significant advantages in weight reduction, volume reduction and complex parts processing. Selective Laser Melting (SLM) technology is a widely used metal additive manufacturing technology. It is based on the discrete-additive forming principle and can form a three-dimensional entity in one go. Compared with traditional manufacturing, it is not constrained by complex structures and overcomes the forming limitations of traditional processing methods.

[0003] Multi-channel structures are very common in the industrial world and are widely used. They can be applied to structures such as transporting fluids, distributing fluids, wall heat exchange and fluid filtration, such as fuel nozzles in aircraft engines, aviation hydraulic housing pipelines, valve blocks and tees in hydraulic systems, etc.

[0004] Usually, the preparation of multi-channel structures is to first use the forging method to form the blank as a whole, and then use the drilling and milling method to process the flow channel. Limited by this traditional method of distributed processing, the flow channel can only be in the form of a straight hole and the cross-communication of the pipeline is not flexible. For example, due to the limitations of traditional processing technology, most hydraulic valve blocks are complex and difficult to process. There are many corners and elbows, long lengths, and sudden shrinkage of pipes, which cause large fluid energy loss, reduced life and efficiency. Therefore, although the hydraulic valve block can easily meet the requirements of connecting various components, it is difficult to meet the performance requirements. For example, the internal flow channel of the fuel nozzle prepared by the traditional manufacturing process needs to have a process hole for retreating the tool, which is prone to steps and the elbow cannot be arc-shaped, all of which have a negative impact on the fluid and performance.

[0005] Therefore, compared with traditional manufacturing, the additive manufacturing method of selective laser melting provides greater freedom for the design of multi-channel structures, and can realize the preparation of pipelines with arbitrary directions and arbitrary curvatures, thereby avoiding too many corners and elbows, shortening the length of the pipeline, and achieving reduced volume and lightweight design. The patent application name is "Lightweight design method of hydraulic valve block based on selective laser melting" and the application number is CN110625115A. It summarizes the process flow of redesigning the manufacture and detection of hydraulic valve blocks based on selective laser melting preparation technology. The patent application name is "A 3D printing pipeline compensation design method based on residual stress correction" and the application number is CN113378386A. The forming effect of the pipeline is ensured by compensating the circular pipeline. However, neither of these two patents mentions the feasibility of unsupported 3D printing pipelines. Currently, the selective laser melting technology cannot be used to prepare circular pipes with horizontal streamlines. The reason is that when the inner diameter of the pipe is greater than 3 mm, internal supports need to be added to prevent the circular pipe from collapsing during the printing process. However, the supports inside the pipe are difficult to remove after printing. This has become a barrier to the use of selective laser melting technology to prepare multi-channel structures. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method, system and terminal for designing special-section pipes based on additive manufacturing, so as to solve the above-mentioned technical problems in the prior art.

[0007] To achieve the above-mentioned purpose and other related purposes, the present invention provides a method for designing a special-section pipeline based on additive manufacturing, which is applied to a multi-channel structure, and the method comprises: obtaining initial design parameters of a circular cross-section multi-channel structure; wherein the design parameters comprise: circular cross-section pipeline design parameters corresponding to a plurality of pipelines with circular cross-sections; based on a special-section pipeline selection condition, selecting a special-section pipeline that needs to be designed with a special cross-section according to the circular cross-section pipeline design parameters corresponding to each pipeline; based on a special-section design rule, performing special-section design on the special-section pipeline, and obtaining the special-section pipeline design parameters corresponding to the special-section pipeline; designing and generating a special-section multi-channel structure model based on the initial design parameters and the special-section pipeline design parameters; performing fluid simulation on the circular cross-section multi-channel structure and the special-section multi-channel structure model respectively by extracting a fluid domain, and comparing the simulation results of the two; if the simulation results are consistent, importing the special-section multi-channel structure model into a 3D printing software for 3D printing.

[0008] In one embodiment of the present invention, the circular cross-section pipeline design parameters include: pipeline streamline direction, flow channel length, inner diameter size and wall thickness.

[0009] In one embodiment of the present invention, the selection condition based on the special-shaped cross-section pipe includes: selecting a pipe whose angle between the pipe streamline direction and the preset printing direction is greater than 45 degrees and whose inner diameter is greater than 3 mm as the special-shaped cross-section pipe that needs to be designed for a special-shaped cross-section.

[0010] In one embodiment of the present invention, the special-section design of the special-section pipe based on the special-section design rule and obtaining the special-section pipe design parameters corresponding to the special-section pipe include: setting the 3D printing overhang angle of the special-section pipe; wherein the 3D printing overhang angle is less than 45 degrees; according to the circular cross-sectional area obtained from the inner diameter size corresponding to the special-section pipe and the 3D printing overhang angle, the special-section parameters corresponding to the special-section with the same area as the circular cross-sectional area are calculated and designed to obtain the special-section pipe design parameters corresponding to the special-section pipe; wherein the special-section pipe design parameters include: pipeline streamline direction, flow channel length, special-section parameters and wall thickness.

[0011] In an embodiment of the present invention, the shape of the irregular cross section includes: a triangle, a rhombus, and a combination of a rhombus and an ellipse.

[0012] In one embodiment of the present invention, the special-shaped cross-section parameters corresponding to the special-shaped cross-section of the combination of rhombus and ellipse include: 3D printing overhang angle, rhombus side length, ellipse minor axis length and major axis length; wherein, the rhombus side length is calculated based on the circular cross-sectional area obtained by the inner diameter size corresponding to the special-shaped cross-section pipe and the 3D printing overhang angle; the ellipse minor axis length is calculated based on the 3D printing overhang angle, the rhombus side length and the circular cross-sectional area; the ellipse major axis length is calculated based on the ellipse minor axis length and the circular cross-sectional area.

[0013] In one embodiment of the present invention, the designing and generating of the special-section multi-channel structure model according to the initial design parameters and the special-section pipe design parameters includes: designing and generating the special-section multi-channel structure model according to the circular cross-section pipe design parameters of the pipe that does not require special-section design and the special-section pipe design parameters of the special-section pipe.

[0014] In one embodiment of the present invention, the method of importing the special-shaped cross-section multi-channel structure model into the 3D printing software for 3D printing includes: importing the special-shaped cross-section multi-channel structure model into the 3D printing pre-processing software to verify its printability without adding support inside; if its printability meets the standard, importing the special-shaped cross-section multi-channel structure model into the slicing software for slicing and printing parameter setting for 3D printing by additive manufacturing equipment.

[0015] To achieve the above-mentioned purpose and other related purposes, the present invention provides a special-section pipeline design system based on additive manufacturing, which is applied to a multi-channel structure. The system comprises: an initial parameter acquisition module, which is used to acquire initial design parameters of a circular cross-section multi-channel structure; wherein the design parameters comprise: circular cross-section pipeline design parameters corresponding to a plurality of pipelines with circular cross-sections; a special-section pipeline selection module, which is connected to the initial parameter acquisition module, and is used to select a special-section pipeline that needs to be designed with a special-section according to the circular cross-section pipeline design parameters corresponding to each pipeline based on the special-section pipeline selection conditions; a special-section pipeline design module, which is connected to the special-section pipeline selection module, and is used to select a special-section pipeline that needs to be designed with a special-section according to the circular cross-section pipeline design parameters corresponding to each pipeline based on the special-section pipeline selection conditions; and a special-section pipeline design module, which is connected to the special-section pipeline selection module, and is used to select a special-section pipeline that needs to be designed with a special-section according to the circular cross-section pipeline design parameters corresponding to each pipeline based on the special-section pipeline selection conditions. A design rule is used to design a special-section pipe for the special-section pipe, and obtain the special-section pipe design parameters corresponding to the special-section pipe; a model generation module is connected to the special-section pipe design module, and is used to design and generate a special-section multi-channel structure model according to the initial design parameters and the special-section pipe design parameters; a simulation module is connected to the model generation module, and is used to perform fluid simulation on the circular cross-section multi-channel structure and the special-section multi-channel structure model by extracting the fluid domain, and compare the simulation results of the two; a 3D printing module is connected to the simulation module, and is used to import the special-section multi-channel structure model into the 3D printing software for 3D printing if the simulation results are consistent.

[0016] To achieve the above-mentioned purpose and other related purposes, the present invention provides a terminal for designing special-section pipes based on additive manufacturing, comprising: a memory for storing computer programs; and a processor for executing the method for designing special-section pipes based on additive manufacturing.

[0017] As described above, the method, system and terminal for designing special-section pipelines based on additive manufacturing of the present invention have the following beneficial effects: the present invention combines the initial design parameters of the circular cross-section multi-channel structure to design a special-section pipeline, which can ensure that the pipeline streamline is in the horizontal direction without adding internal support and can be directly printed, and the geometric parameters of the special-section have little effect on the flow characteristics of the fluid in the microchannel, and has engineering application value. Compared with the multi-channel structure obtained by traditional preparation technology, the present invention can reduce the weight of the multi-channel structure, and also reduce the volume of its multi-channel structure and realize an integrated design. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic flow chart of a method for designing a special-section pipeline based on additive manufacturing in one embodiment of the present invention.

[0019] Figure 2 Shown is a schematic structural diagram of a multi-channel structure in one embodiment of the present invention.

[0020] Figure 3 Shown is a schematic flow chart of a method for designing a special-section pipeline based on additive manufacturing in one embodiment of the present invention.

[0021] Figure 4 Shown is a schematic flow chart of a method for designing a special-section pipeline based on additive manufacturing in one embodiment of the present invention.

[0022] Figure 5 A schematic structural diagram showing a special-shaped cross-section combining a rhombus and an ellipse in one embodiment of the present invention.

[0023] Figure 6 Shown is a schematic structural diagram of a system for designing special-section pipelines based on additive manufacturing in one embodiment of the present invention.

[0024] Figure 7 Shown is a schematic structural diagram of a terminal designed for a special-section pipeline based on additive manufacturing in one embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the present invention. It should be understood that other embodiments may also be used, and that mechanical composition, structural, electrical and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present invention is limited only by the claims of the published patents. The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0027] Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a part is said to "include" a certain constituent element, unless otherwise stated, it does not exclude other constituent elements, but means that other constituent elements may be included.

[0028] The terms first, second and third mentioned herein are used to describe various parts, components, regions, layers and / or segments, but are not limited thereto. These terms are only used to distinguish a certain part, component, region, layer or segment from other parts, components, regions, layers or segments. Therefore, the first part, component, region, layer or segment described below may refer to the second part, component, region, layer or segment within the scope of the present invention.

[0029] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0030] The present invention provides a method for designing a special-section pipeline based on additive manufacturing. By combining the initial design parameters of a circular cross-section multi-channel structure, a special-section pipeline is designed. It can ensure that when the pipeline streamline is in the horizontal direction, it can be directly printed without adding internal support, and the geometric parameters of the special-section have little effect on the flow characteristics of the fluid in the microchannel, which has engineering application value. Compared with the multi-channel structure obtained by traditional preparation technology, the present invention can reduce the weight of the multi-channel structure, and also reduce the volume of its multi-channel structure and realize an integrated design.

[0031] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be embodied in many different forms and is not limited to the embodiments described herein.

[0032] like Figure 1 As shown, a schematic flow chart of a method for designing a special-section pipeline based on additive manufacturing in an embodiment of the present invention is shown.

[0033] Applied to a multi-channel structure, the method comprises:

[0034] Step S11: Obtaining initial design parameters of the circular cross-section multi-channel structure.

[0035] Specifically, the design parameters include: circular cross-section pipeline design parameters corresponding to each of a plurality of pipelines having a circular cross-section.

[0036] Optionally, the circular cross-section pipeline design parameters include: pipeline streamline direction, flow channel length, inner diameter size and wall thickness.

[0037] Step S12: Based on the special-section pipe selection condition, the special-section pipe that needs to be designed for a special section is selected according to the circular-section pipe design parameters corresponding to each pipe.

[0038] Optionally, the selection condition based on the special-section pipe includes: selecting a pipe whose angle between the pipe streamline direction and the preset printing direction is greater than 45 degrees and whose inner diameter is greater than 3 mm as the special-section pipe requiring special-section design.

[0039] It should be noted that the preset printing direction can be set according to demand or the specific structural design of the multi-channel structure; for example, a multi-channel structure with 1 inlet and 2 outlets, the main channel is 80mm long, the inner diameter is 12mm, the wall thickness is 1mm, and the branch channel is located in the middle of the main channel, with a length of 40mm, an inner diameter of 4mm, and a wall thickness of 1mm; taking the streamline direction of the main channel as the printing direction, the streamline of the branch channel is horizontal, and the branch channel is a structure with an inner diameter greater than 3mm, then the branch channel is selected as a special-section pipe that requires a special-section design.

[0040] Step S13: Based on the special-section design rule, the special-section pipe is designed with a special-section, and the special-section pipe design parameters corresponding to the special-section pipe are obtained.

[0041] Optionally, the special-shaped cross-section design rule is to design a special-shaped cross-section with an overhang angle less than 45 degrees and an area the same as the circular cross-section area of ​​the pipe, and the special-shaped cross-section pipe does not change the flow characteristics of the fluid in the flow channel.

[0042] Optionally, the performing a special-section design on the special-section pipe based on the special-section design rule and obtaining the special-section pipe design parameters corresponding to the special-section pipe includes:

[0043] Setting the 3D printing overhang angle of the special-shaped cross-section pipe; wherein the 3D printing overhang angle is less than 45 degrees;

[0044] According to the circular cross-sectional area obtained from the inner diameter corresponding to the special-section pipe and the 3D printed overhang angle, the special-section parameters corresponding to the special-section with the same area as the circular cross-sectional area are calculated and designed, and the special-section pipe design parameters corresponding to the special-section pipe are obtained according to the circular cross-sectional pipe design parameters of the pipe; wherein the special-section pipe design parameters include: pipe streamline direction, flow channel length, special-section parameters and wall thickness.

[0045] Optionally, the shape of the special-shaped cross section includes: a triangle, a rhombus, and a combination of a rhombus and an ellipse.

[0046] Optionally, the special-shaped cross-section parameters corresponding to the special-shaped cross-section of the combination of rhombus and ellipse include: 3D printing overhang angle, rhombus side length, ellipse minor axis length and major axis length;

[0047] The side length of the rhombus is calculated based on the circular cross-sectional area obtained from the inner diameter corresponding to the special-section pipe and the 3D printed overhang angle; the minor axis length of the ellipse is calculated based on the 3D printed overhang angle, the side length of the rhombus and the circular cross-sectional area; the major axis length of the ellipse is calculated based on the minor axis length of the ellipse and the circular cross-sectional area.

[0048] Optionally, the special-shaped cross-section parameters corresponding to the triangular special-shaped cross-section include: a 3D printing overhang angle and a triangle side length; the triangle side length is calculated based on a circular cross-sectional area obtained from an inner diameter corresponding to the special-shaped cross-section pipe and the 3D printing overhang angle.

[0049] Optionally, the special-shaped cross-section parameters corresponding to the rhombus-shaped special-shaped cross-section include: a 3D printing overhang angle and a rhombus side length; the rhombus side length is calculated based on a circular cross-sectional area obtained from an inner diameter corresponding to the special-shaped cross-section pipe and the 3D printing overhang angle.

[0050] Step S14: Designing and generating a special-section multi-channel structure model according to the initial design parameters and the special-section pipeline design parameters.

[0051] Optionally, the special-section multi-channel structure model is generated based on the circular cross-section pipe design parameters of the pipe that does not require special-section design in the circular cross-section multi-channel structure and the special-section pipe design parameters of the special-section pipe.

[0052] Step S15: Perform fluid simulation on the circular cross-section multi-channel structure and the irregular cross-section multi-channel structure model by extracting the fluid domain, and compare the simulation results of the two.

[0053] Optionally, extract the fluid domain, use k-ωSST as the turbulence model, 20 atmospheres as the working environment, diesel as the working fluid, 1kg / s as the inlet flow rate, 0Pa as the outlet gauge pressure, and 20μm as the roughness boundary conditions, and compare the simulation results of the special-section multi-channel structure model with the simulation results of the circular cross-section multi-channel structure. If they are consistent, subsequent 3D printing preparations can be carried out.

[0054] Step S16: If the simulation results are consistent, the special-shaped cross-section multi-channel structure model is imported into 3D printing software for 3D printing.

[0055] Optionally, the method of importing the special-shaped cross-section multi-channel structure model into 3D printing software for 3D printing includes: importing the special-shaped cross-section multi-channel structure model into 3D printing pre-processing software to verify its printability without adding internal supports; if its printability meets the standards, importing the special-shaped cross-section multi-channel structure model into slicing software for slicing and printing parameter setting, and importing the set file package into the selected area laser melting additive manufacturing equipment to manufacture corresponding parts.

[0056] In order to better describe the design method of special-section pipelines based on additive manufacturing, the following specific embodiments are provided for description.

[0057] Example 1: A design method for special-section pipelines based on additive manufacturing.

[0058] Applicable to 1-input 2-output multi-channel structure, such as Figure 2 As shown; Figure 3 It is a schematic flow chart of the design method of special-section pipe (diamond-shaped section) based on additive manufacturing in this embodiment. Figure 4 It is a flow chart of the design method of the special-section pipe (special-section combining diamond and ellipse shapes) based on additive manufacturing in this embodiment.

[0059] The method comprises:

[0060] Get the circular cross-section pipeline design parameters of the main channel and the branch channel in the 1-in-2-out circular multi-channel structure; the main channel has a length of 80mm, an inner diameter of 12mm, and a wall thickness of 1mm. The branch channel is located in the middle of the main channel, with a length of 40mm, an inner diameter of 4mm, and a wall thickness of 1mm. Taking the streamline direction of the main channel as the printing direction, the streamline of the branch channel is horizontal, and the branch channel has an inner diameter greater than 3mm. The pipeline layout, cross-sectional area, and wall thickness are determined according to the actual working conditions and deployment conditions.

[0061] Since the angle between the streamline direction of the branch flow channel and the printing direction is greater than 45 degrees, and the inner diameter is greater than 3mm, a special-shaped cross-section pipe is designed for the branch flow channel;

[0062] The design criteria are that the 3D printing overhang angle is less than 45° without support, the irregular cross-sectional area is equal to the circular cross-sectional area with an inner diameter of 4mm, and the flow characteristics of the fluid in the flow channel are not changed. The irregular cross-sectional parameters corresponding to the irregular cross-sectional area of ​​the combination of diamond and ellipse with the same area as the circular cross-sectional area are calculated to obtain the irregular cross-sectional pipe design parameters corresponding to the irregular cross-sectional pipe. Among them, the irregular cross-sectional area of ​​the combination of diamond and ellipse is as follows: Figure 5 The parameters of the special-shaped section include: overhang angle, rhombus side length, ellipse minor axis length and major axis length; the calculation process is as follows Figure 4 The parameters of the special-shaped section of the diamond section include: the overhang angle and the length of the diamond side; the calculation process is as follows Figure 3 shown.

[0063] Based on the design parameters of circular cross-section pipelines and special-section pipelines, CAD software is used to complete the overall pipeline model design.

[0064] The fluid domain of the pipeline is extracted, and fluid simulation is performed to compare the simulation results of pipelines with different cross-sections. According to actual experiments, the inlet pressure cloud map, outlet 1 velocity cloud map, outlet 2 velocity cloud map, and outlet flow rate of the pipeline with a circular cross-section and a diamond + elliptical cross-section are compared, and it is found that the effects of the two are similar.

[0065] The designed special-section multi-channel structure was imported into the 3D printing pre-processing software to verify its printability without adding internal supports.

[0066] Import the model into the slicing software to complete the slicing and printing parameter settings; import the set file package into the selected area laser melting additive manufacturing equipment to manufacture the corresponding parts.

[0067] The purpose of this embodiment is to design a special-section pipe with a multi-channel structure suitable for selective laser melting preparation technology. Compared with a circular cross-section pipe, the present invention ensures the 3D printing effect of the pipe by optimizing the cross-section design without adding internal support for the pipe with an angle between the streamline and the printing direction greater than 45° and an inner diameter greater than 3mm. At the same time, the geometric parameters of the special-section designed by the present invention have little effect on the flow characteristics of the fluid in the microchannel, which will be conducive to achieving the overall volume reduction, lightweight, and integrated design goals of the multi-channel structure.

[0068] Similar to the principles of the above embodiments, the present invention provides a design system for special-section pipelines based on additive manufacturing.

[0069] The following provides specific embodiments in conjunction with the accompanying drawings:

[0070] like Figure 6A structural schematic diagram of a special-section pipeline design system based on additive manufacturing in an embodiment of the present invention is shown.

[0071] Applied to a multi-channel structure, the system comprises:

[0072] The initial parameter acquisition module 61 is used to acquire the initial design parameters of the circular cross-section multi-channel structure; wherein the design parameters include: circular cross-section pipeline design parameters corresponding to the plurality of pipelines with circular cross-sections;

[0073] The special-section pipe selection module 62 is connected to the initial parameter acquisition module 61 and is used to select the special-section pipe that needs to be designed with a special section according to the circular section pipe design parameters corresponding to each pipe based on the special-section pipe selection conditions;

[0074] The special-section pipeline design module 63 is connected to the special-section pipeline selection module 62 and is used to perform special-section design on the special-section pipeline based on the special-section design rule and obtain the special-section pipeline design parameters corresponding to the special-section pipeline;

[0075] A model generation module 64, connected to the special-section pipeline design module 63, is used to design and generate a special-section multi-channel structure model according to the initial design parameters and the special-section pipeline design parameters;

[0076] A simulation module 66, connected to the model generation module 64, is used to perform fluid simulation on the circular cross-section multi-channel structure model and the irregular cross-section multi-channel structure model by extracting fluid domains, and compare the simulation results of the two;

[0077] The 3D printing module 66 is connected to the simulation module 66 and is used to import the special-shaped cross-section multi-channel structure model into the 3D printing software for 3D printing if the simulation results are consistent.

[0078] It should be understood that Figure 6 The division of each module in the system embodiment is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or physically separated. And these modules can be all implemented in the form of software calling through processing elements; or all implemented in the form of hardware; or some modules can be implemented in the form of software calling through processing elements, and some modules can be implemented in the form of hardware;

[0079] For example, each module may be one or more integrated circuits configured to implement the above method, such as: one or more application specific integrated circuits (ASIC), or one or more digital signal processors (DSP), or one or more field programmable gate arrays (FPGA). For another example, when a module above is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0080] Since the implementation principle of the additive manufacturing-based special-section pipeline design system has been described in the aforementioned embodiments, it will not be repeated here.

[0081] like Figure 7 A schematic structural diagram of a terminal 70 for designing a special-section pipeline based on additive manufacturing in an embodiment of the present invention is shown.

[0082] The terminal 70 for designing special-shaped cross-section pipelines based on additive manufacturing includes: a memory 71 and a processor 72. The memory 71 is used to store computer programs; the processor 72 runs the computer program to implement the following Figure 1 The method for designing special-section pipelines based on additive manufacturing.

[0083] Optionally, the number of the memory 71 can be one or more, the number of the processor 72 can be one or more, and Figure 7 Take one as an example.

[0084] Optionally, the processor 72 in the additive manufacturing-based special-section pipeline design terminal 70 will be as follows: Figure 1 In the above steps, one or more instructions corresponding to the process of the application are loaded into the memory 71, and the processor 72 runs the application stored in the first memory 71, thereby achieving the following Figure 1 Various functions in the additive manufacturing-based special-section pipe design method.

[0085] Optionally, the memory 71 may include but is not limited to high-speed random access memory and non-volatile memory. For example, one or more disk storage devices, flash memory devices or other non-volatile solid-state storage devices; the processor 72 may include but is not limited to a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0086] Optionally, the processor 72 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0087] The present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program is executed as follows: Figure 1 The method for designing special-section pipes based on additive manufacturing is shown. The computer-readable storage medium may include, but is not limited to, a floppy disk, an optical disk, a CD-ROM (read-only optical disk memory), a magneto-optical disk, a ROM (read-only memory), a RAM (random access memory), an EPROM (erasable programmable read-only memory), an EEPROM (electrically erasable programmable read-only memory), a magnetic card or an optical card, a flash memory, or other types of media / machine-readable media suitable for storing machine-executable instructions. The computer-readable storage medium may be a product that is not connected to a computer device, or a component that is connected to a computer device for use.

[0088] In summary, the present invention is based on the additive manufacturing of special-section pipeline design method, system and terminal, and designs special-section pipelines by combining the initial design parameters of the circular cross-section multi-channel structure, which can ensure that the pipeline streamline is in the horizontal direction without adding internal support and can be directly printed, and the geometric parameters of the special-section have little effect on the flow characteristics of the fluid in the microchannel, and has engineering application value. Compared with the multi-channel structure obtained by traditional preparation technology, the present invention can reduce the weight of the multi-channel structure, and also reduce the volume of the multi-channel structure and realize an integrated design. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0089] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A design method for special-section pipelines based on additive manufacturing, characterized in that: Applied to a multi-channel structure, the method comprises: Acquire initial design parameters of a circular cross-section multi-channel structure; wherein the design parameters include: circular cross-section pipeline design parameters corresponding to each of a plurality of pipelines having a circular cross-section; Based on the special-section pipe selection condition, the special-section pipe that needs to be designed for the special section is selected according to the circular-section pipe design parameters corresponding to each pipe, wherein the special-section pipe selection condition includes: selecting a pipe whose angle between the pipe streamline direction and the preset printing direction is greater than 45 degrees and whose inner diameter is greater than 3 mm as the special-section pipe that needs to be designed for the special section; Based on the special-section design rule, the special-section pipe is designed with a special-section, and the special-section pipe design parameters corresponding to the special-section pipe are obtained, which includes: setting the 3D printing overhang angle of the special-section pipe; wherein the 3D printing overhang angle is less than 45 degrees; according to the circular cross-sectional area obtained from the inner diameter size corresponding to the special-section pipe and the 3D printing overhang angle, the special-section parameters corresponding to the special-section with the same area as the circular cross-sectional area are calculated and designed to obtain the special-section pipe design parameters corresponding to the special-section pipe; wherein the special-section pipe design parameters include: pipe streamline direction, flow channel length, special-section parameters and wall thickness; Designing and generating a multi-channel structural model of a special-shaped cross-section according to the initial design parameters and the design parameters of the special-shaped cross-section pipeline; By extracting the fluid domain, fluid simulation is performed on the circular cross-section multi-channel structure model and the irregular cross-section multi-channel structure model respectively, and the simulation results of the two are compared; If the simulation results are consistent, the special-shaped cross-section multi-channel structure model is imported into the 3D printing software for 3D printing.

2. The method for designing special-section pipelines based on additive manufacturing according to claim 1, characterized in that: The circular cross-section pipeline design parameters include: pipeline streamline direction, flow channel length, inner diameter size and wall thickness.

3. The method for designing special-section pipelines based on additive manufacturing according to claim 1, characterized in that: The shape of the special-shaped cross section includes: a triangle, a rhombus, and a combination of a rhombus and an ellipse.

4. The method for designing special-section pipelines based on additive manufacturing according to claim 3, characterized in that: The special-shaped cross-section parameters corresponding to the special-shaped cross-section in the shape of a combination of a rhombus and an ellipse include: a 3D printed overhang angle, a rhombus side length, an ellipse minor axis length, and a major axis length; wherein the rhombus side length is calculated based on the circular cross-sectional area obtained from the inner diameter corresponding to the special-shaped cross-section pipe and the 3D printed overhang angle; the ellipse minor axis length is calculated based on the 3D printed overhang angle, the rhombus side length, and the circular cross-sectional area; the ellipse major axis length is calculated based on the ellipse minor axis length and the circular cross-sectional area.

5. The method for designing special-section pipelines based on additive manufacturing according to claim 1, characterized in that: The designing and generating of the special-section multi-channel structure model according to the initial design parameters and the special-section pipe design parameters includes: designing and generating the special-section multi-channel structure model according to the circular cross-section pipe design parameters of the pipe that does not require special-section design and the special-section pipe design parameters of the special-section pipe.

6. The method for designing special-section pipelines based on additive manufacturing according to claim 1, characterized in that: The method of importing the special-shaped cross-section multi-channel structure model into 3D printing software for 3D printing includes: Importing the special-shaped cross-section multi-channel structure model into 3D printing pre-processing software to verify its printability without adding support inside; If its printability meets the standard, the special-shaped cross-section multi-channel structure model is imported into the slicing software for slicing and setting of printing parameters for 3D printing by additive manufacturing equipment.

7. A special-section pipeline design system based on additive manufacturing, characterized in that: Applied to a multi-channel structure, the system comprises: An initial parameter acquisition module is used to acquire initial design parameters of a circular cross-section multi-channel structure; wherein the design parameters include: circular cross-section pipeline design parameters corresponding to a plurality of pipelines with circular cross-sections; A special-section pipe selection module is connected to the initial parameter acquisition module and is used to select a special-section pipe that needs to be designed for a special section based on the special-section pipe selection condition and the circular-section pipe design parameters corresponding to each pipe. The special-section pipe selection condition includes: selecting a pipe whose angle between the pipe streamline direction and the preset printing direction is greater than 45 degrees and whose inner diameter is greater than 3 mm as the special-section pipe that needs to be designed for a special section; A special-section pipeline design module is connected to the special-section pipeline selection module, and is used to perform special-section design on the special-section pipeline based on the special-section design rule, and obtain the special-section pipeline design parameters corresponding to the special-section pipeline, which includes: setting the 3D printing overhang angle of the special-section pipeline; wherein the 3D printing overhang angle is less than 45 degrees; according to the circular cross-sectional area obtained from the inner diameter size corresponding to the special-section pipeline and the 3D printing overhang angle, calculating and designing the special-section parameters corresponding to the special-section with the same area as the circular cross-sectional area, so as to obtain the special-section pipeline design parameters corresponding to the special-section pipeline; wherein the special-section pipeline design parameters include: pipeline streamline direction, flow channel length, special-section parameters and wall thickness; A model generation module, connected to the special-section pipeline design module, is used to design and generate a special-section multi-channel structure model according to the initial design parameters and the special-section pipeline design parameters; A simulation module, connected to the model generation module, for performing fluid simulation on the circular cross-section multi-channel structure model and the irregular cross-section multi-channel structure model respectively by extracting fluid domains, and comparing the simulation results of the two; The 3D printing module is connected to the simulation module and is used to import the special-shaped cross-section multi-channel structure model into the 3D printing software for 3D printing if the simulation results are consistent.

8. A terminal for designing a special-section pipeline based on additive manufacturing, characterized in that: include: Memory for storing computer programs; A processor, used to execute the method for designing special-section pipes based on additive manufacturing as described in any one of claims 1 to 6.

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