Method, device, medium and equipment for obtaining reference block of composite material 3D printing nondestructive testing laminated board

Abstract

The invention discloses a method, a device, a medium and equipment for obtaining a reference block of a composite material 3D printing nondestructive testing laminated board, relates to the technical field of composite material additive manufacturing, constructs the reference block of the nondestructive testing laminated board in a mode of pre-designing defects, and solves the problem that the internal quality of a thermoplastic composite material 3D printing piece cannot be compared and checked. The influence of the embedded defects on the nondestructive testing laminated board is in the thickness direction, so that a three-dimensional model of the reference block is obtained according to the actual thickness condition of a workpiece, and then the defects are constructed in a digital-analog laying layer of the reference block according to printing parameters of 3D printing equipment; the method comprises the following steps of: simulating the main expression form of wire deficiency, namely fused deposition additive manufacturing 3D printing defects, truly reflecting the internal quality of a workpiece, and finally performing digital-to-analog conversion on a reference block and fusing the digital-to-analog conversion into a 3D printing process to prepare the reference block which can be used for contrast inspection of the internal quality of a thermoplastic composite 3D printed workpiece.

Description

Technical Field

[0001] The present application relates to the field of composite additive manufacturing technology, and specifically to a method, device, medium and equipment for obtaining a composite 3D printed non-destructive testing laminate comparison test block. Background Art

[0002] Thermosetting composite materials are primarily manufactured using a layup + autoclave method. Internal defects in the parts are primarily manifested as pores, delamination, and inclusions. Non-destructive testing comparison test blocks are manufactured by pre-embedding defects during the layup process. A common method for 3D printing of thermoplastic composites is fused deposition modeling (FDM). This involves using a print head to heat and melt thermoplastic 3D printing filament at high temperatures. The molten material is then extruded from the print head nozzle at a certain layer thickness, and then accumulated along a set path to form a single-layer profile. Finally, the desired part is accumulated layer by layer. Since 3D printing of thermoplastic composites involves additive manufacturing in a closed cavity, the temperature during printing is high, making it difficult to pre-embed defects. This results in an inability to conduct a comparative inspection of the internal quality of 3D-printed parts made of thermoplastic composites. Summary of the Invention

[0003] The main purpose of this application is to provide a method, device, medium and equipment for obtaining a comparison test block for non-destructive testing of composite 3D printed laminates, aiming to solve the problem in the prior art that it is impossible to conduct a comparative check to determine whether the internal quality of thermoplastic composite 3D printed parts is qualified.

[0004] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows: In a first aspect, an embodiment of the present application provides a method for obtaining a composite 3D printed non-destructive testing laminate comparison test block, comprising the following steps: Obtain a three-dimensional model of the comparison test block based on the thickness of the workpiece to be non-destructively tested; According to the printing parameters of the 3D printing device used for printing, multiple defect characterization areas are designed in the ply of the three-dimensional model of the comparison test block to obtain the target three-dimensional model of the comparison test block; Convert the target 3D model of the comparison test block into a file format and import it into the slicing software for slicing to generate the 3D printing target trajectory code; The 3D printing target trajectory code is imported into the 3D printing device and 3D printed to obtain a non-destructive testing laminate comparison test block.

[0005] In a possible implementation of the first aspect, the plurality of defect characterization regions are evenly distributed along the length direction of the comparison test block and vary in a step-wise manner in the thickness direction of the comparison test block.

[0006] In a possible implementation of the first aspect, each defect representation region includes a plurality of hollow rectangular regions extending along a width direction of the comparison test block, and the extension lengths of the plurality of hollow rectangular regions in the same defect representation region are different.

[0007] In a possible implementation of the first aspect, the width of the hollow rectangular area is equal to the printing line width of the 3D printing device, and the height is equal to the printing layer thickness of the 3D printing device.

[0008] In a possible implementation of the first aspect, obtaining a three-dimensional model of a comparison test block according to the thickness of a workpiece to be nondestructively tested includes: According to the thickness of the workpiece to be nondestructively tested, a three-dimensional model of a comparison test block of uniform thickness or a three-dimensional model of a comparison test block of variable thickness is obtained; wherein the three-dimensional model of the comparison test block of variable thickness is a step-shaped test block with a step-like change.

[0009] In a possible implementation of the first aspect, the three-dimensional model of the variable thickness comparison test block includes at least three stepped regions, and the thicknesses of the three stepped regions are respectively the minimum thickness, the middle thickness, and the maximum thickness of the workpiece to be nondestructively tested.

[0010] In a possible implementation of the first aspect, multiple defect characterization areas are designed in the ply of the three-dimensional model of the comparison test block, including: A plurality of defect characterization regions are designed in the ply of each step region of the three-dimensional model of the variable thickness comparison test block.

[0011] In a second aspect, an embodiment of the present application provides a device for obtaining a comparison test block for a composite 3D printed non-destructive testing laminate, comprising: The model acquisition module is used to obtain a three-dimensional model of the comparison test block according to the thickness of the workpiece to be non-destructively tested; A defect design module is used to design a plurality of defect representation areas in the ply of the three-dimensional model of the comparison test block according to the printing parameters of the 3D printing device used for printing, so as to obtain a target three-dimensional model of the comparison test block; The model conversion module is used to convert the target three-dimensional model of the comparison test block into a file format and import it into the slicing software for slicing, thereby generating a 3D printing target trajectory code; The printing preparation module is used to import the 3D printing target trajectory code into the 3D printing device and perform 3D printing to obtain a non-destructive testing laminate comparison test block.

[0012] In a third aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program. When the computer program is loaded and executed by a processor, the method for obtaining a composite 3D printed non-destructive testing laminate comparison test block as provided in any one of the first aspects above is implemented.

[0013] In a fourth aspect, an embodiment of the present application provides an electronic device, including a processor and a memory, wherein: Memory is used to store computer programs; The processor is used to load and execute a computer program so that the electronic device executes the method for obtaining a composite 3D printed non-destructive testing laminate comparison test block as provided in any one of the first aspects above.

[0014] Compared with the prior art, the present invention has the following advantages: The embodiments of the present application propose a method, device, medium and equipment for obtaining a composite material 3D printed non-destructive testing laminate comparison test block. The method includes: obtaining a three-dimensional model of the comparison test block based on the thickness of the workpiece to be non-destructively tested; designing multiple defect characterization areas in the ply of the three-dimensional model of the comparison test block based on the printing parameters of the 3D printing device used for printing, to obtain a target three-dimensional model of the comparison test block; converting the target three-dimensional model of the comparison test block into a file format and importing it into slicing software for slicing to generate a 3D printing target trajectory code; importing the 3D printing target trajectory code into a 3D printing device and performing 3D printing to obtain a non-destructive testing laminate comparison test block. This application constructs a non-destructive testing laminate comparison test block by pre-designing defects to solve the problem that the internal quality of thermoplastic composite 3D printed parts cannot be checked. Since the embedded defects affect the non-destructive testing laminate in the thickness direction, the three-dimensional model of the comparison test block is first obtained according to the actual thickness of the part. Then, defects are constructed in the digital model layer of the comparison test block according to the printing parameters of the 3D printing equipment to simulate the main manifestation of filament missing, which is a fused deposition additive manufacturing 3D printing defect, to truly reflect the internal quality of the part. Finally, the digital-to-analog conversion of the comparison test block is integrated into the 3D printing process to prepare a comparison test block that can be used for the comparison and inspection of the internal quality of thermoplastic composite 3D printed parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the electronic device structure of the hardware operating environment involved in the embodiments of the present application; Figure 2 A schematic flow chart of a method for obtaining a comparison test block for a composite 3D printed non-destructive testing laminate provided in an embodiment of the present application; Figure 3 A front view of a comparative test block of medium thickness in the method for obtaining a comparative test block for a composite 3D printed non-destructive testing laminate provided in an embodiment of the present application; Figure 4 A top view of a comparative test block of medium thickness in the method for obtaining a comparative test block for a composite 3D printed non-destructive testing laminate provided in an embodiment of the present application; Figure 5A front view of a comparative test block of variable thickness in the method for obtaining a comparative test block for a composite 3D printed non-destructive testing laminate provided in an embodiment of the present application; Figure 6 A top view of a comparison test block of varying thickness in the method for obtaining a comparison test block for a composite 3D printed non-destructive testing laminate provided in an embodiment of the present application; Figure 7 Schematic diagram of a module of a device for obtaining a comparative test block for a composite 3D printed non-destructive testing laminate provided in an embodiment of the present application; Markings in the figure: 101-processor, 102-communication bus, 103-network interface, 104-user interface, 105-memory, 1-equal thickness comparison block, 11-first defect characterization area of ​​equal thickness comparison block, 111-third defect characterization area of ​​first step area, 112-second hollow rectangular area of ​​equal thickness comparison block, 113-third hollow rectangular area of ​​equal thickness comparison block, 12-second defect characterization area of ​​equal thickness comparison block, 13-third defect characterization area of ​​equal thickness comparison block, 2-variable thickness comparison block, 21-first step area, 211-first defect characterization area of ​​first step area, 2111-first hollow rectangular area of ​​variable thickness comparison block, 2112-second hollow rectangular area of ​​variable thickness comparison block, 2113-third hollow rectangular area of ​​variable thickness comparison block, 212-second defect characterization area of ​​first step area, 213-third defect characterization area of ​​first step area, 22-second step area, 23-third step area, 24-fourth step area. DETAILED DESCRIPTION

[0016] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0017] Refer to the attached Figure 1 , attached Figure 1This is a schematic diagram of the structure of an electronic device of the hardware operating environment involved in the embodiment of the present application. The electronic device may include: a processor 101, such as a central processing unit (CPU), a communication bus 102, a user interface 104, a network interface 103, and a memory 105. Among them, the communication bus 102 is used to realize the connection and communication between these components. The user interface 104 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and optionally the user interface 104 may also include a standard wired interface and a wireless interface. The network interface 103 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (WIreless-FIdelity, WI-FI) interface). The memory 105 may optionally be a storage device independent of the aforementioned processor 101. The memory 105 may be a high-speed random access memory (RAM) memory, or a stable non-volatile memory (NVM), such as at least one disk storage. The processor 101 may be a general-purpose processor, including a central processing unit, a network processor, etc., or may be a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component.

[0018] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation to the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0019] As attached Figure 1 As shown, the memory 105 as a storage medium may include an operating system, a network communication module, a user interface module, and a device for obtaining a comparison test block for composite 3D printing non-destructive testing laminates.

[0020] In the attached Figure 1 In the electronic device shown, the network interface 103 is mainly used for data communication with the network server; the user interface 104 is mainly used for data interaction with the user; the processor 101 and the memory 105 in this application can be set in the electronic device, and the electronic device calls the composite 3D printed non-destructive testing laminate comparison test block acquisition device stored in the memory 105 through the processor 101, and executes the composite 3D printed non-destructive testing laminate comparison test block acquisition method provided in the embodiment of the present application.

[0021] Refer to the attached Figure 2Based on the hardware device of the aforementioned embodiment, an embodiment of the present application provides a method for obtaining a comparison test block for a composite 3D printed non-destructive testing laminate, comprising the following steps: S10: Obtain a three-dimensional model of a comparison test block according to the thickness of the workpiece to be nondestructively tested.

[0022] In the specific implementation process, the thickness of the workpiece to be non-destructively tested can be measured in its digital model, and the three-dimensional model of the laminate comparison test block is designed using three-dimensional modeling software. The ply order and number are consistent with the workpiece to be non-destructively tested. In specific applications, the size of the comparison test block is designed to be no less than 200mm*200mm. In order to make the comparison test block more applicable, its design is determined according to the thickness distribution of the workpiece to be non-destructively tested, that is, the three-dimensional model of the comparison test block can be designed to have constant thickness or variable thickness. Specifically: according to the thickness of the workpiece to be non-destructively tested, the three-dimensional model of the comparison test block is obtained, including: According to the thickness of the workpiece to be nondestructively tested, a three-dimensional model of a comparison test block of uniform thickness or a three-dimensional model of a comparison test block of variable thickness is obtained; wherein the three-dimensional model of the comparison test block of variable thickness is a step-shaped test block with a step-like change.

[0023] In the specific implementation process, in order to cover more application scenarios and make the method of this application applicable to different types of composite material parts, a three-dimensional model of a constant thickness comparison test block or a variable thickness comparison test block is designed according to the actual thickness distribution of the parts to be non-destructively tested. The constant thickness, i.e., laminate comparison test block, is a whole plate structure with uniform thickness, while the variable thickness, i.e., laminate comparison test block, is a structure with uneven thickness. However, considering that the structure of the variable thickness part is complex and the real structure cannot be fully restored, the three-dimensional model of the variable thickness comparison test block is designed as a stepped test block with a stepped change.

[0024] In one embodiment, the three-dimensional model of the variable thickness comparison test block includes at least three stepped regions, and the thicknesses of the three stepped regions are respectively the minimum thickness, the middle thickness, and the maximum thickness of the workpiece to be non-destructively tested.

[0025] In the specific implementation process, in order to make the thickness range of the variable thickness comparison test block more evenly cover the actual variable thickness workpiece structure, it is designed to be a plurality of evenly changing step areas, as shown in the attached figure. Figure 5 The following is a comparison test block with four-layer step changes. For variable thickness parts, when measuring the thickness of the parts, it is necessary to measure the minimum thickness value H min And the maximum thickness value H max , and calculate the middle thickness value H ave , H ave =(H max +H min) / 2, the three-dimensional model of the comparative test block with variable thickness includes at least three step areas of minimum thickness, intermediate thickness and maximum thickness. For workpieces with constant thickness, the thickness value H of the workpiece is measured as the thickness of the three-dimensional model of the comparative test block with constant thickness. Figure 3 Shown is a front view of a comparison test block of equal thickness, with Figure 4 The following is a top view of a comparison test block of equal thickness. Figure 5 Shown is a front view of a comparison test block with variable thickness, Figure 6 The figure shows a top view of a comparative test block with variable thickness. It should be noted that the length direction and width direction of the comparative test block described in the embodiment of the present application are the same as those in the attached figure. Figure 4 and attached Figure 6 The horizontal and vertical directions shown in the figure are as follows: Figure 3 and attached Figure 5 The height of the vertical comparison test block shown in .

[0026] S20: Designing a plurality of defect characterization regions in the ply of the three-dimensional model of the comparison test block according to printing parameters of the 3D printing device used for printing, to obtain a target three-dimensional model of the comparison test block.

[0027] During the specific implementation process, defects are pre-designed in the three-dimensional model of the comparison test block to obtain defect characterization areas. Since filament loss is the main manifestation of fused deposition additive manufacturing 3D printing defects, these defect characterization areas are manifested as hollow areas designed in the ply. The parameters of these defect characterization areas are related to the printing parameters of the 3D printing equipment, allowing them to truly reflect the internal quality of the 3D printed parts.

[0028] In one embodiment, the plurality of defect characterization regions are evenly distributed along the length direction of the comparison test block and vary in a step-wise manner in the thickness direction of the comparison test block.

[0029] In the specific implementation process, the defect characterization area is evenly covered with the comparison test block, so that it can have a better comparison inspection effect after preparation. Figure 3 The figure shows a constant thickness comparison test block 1, in which three defect characterization areas are designed inside the ply, namely the first defect characterization area 11 of the constant thickness comparison test block, the second defect characterization area 12 of the constant thickness comparison test block, and the third defect characterization area 13 of the constant thickness comparison test block. Figure 5The figure shows a variable thickness comparison test block 2, which is designed in a four-layer stepped shape. The four stepped areas are the first step area 21, the second step area 22, the third step area 23, and the fourth step area 24. Three defect characterization areas are designed inside the ply of each step area. Taking the first step area 21 as an example, the ply is designed with the first step area first defect characterization area 211, the first step area second defect characterization area 212, and the first step area third defect characterization area 213.

[0030] In one embodiment, each defect representation region includes a plurality of hollow rectangular regions extending along the width direction of the comparison test block, and the extension lengths of the plurality of hollow rectangular regions in the same defect representation region are different.

[0031] In the specific implementation process, the actual prepared parts may have different degrees of wire missing defects in different parts. Therefore, each defect characterization area is designed as a plurality of hollow rectangular areas extending along the width direction of the comparison test block. Taking the first defect characterization area 11 of the equal thickness comparison test block as an example, it is designed to be composed of three sections of hollow rectangular areas. The extension lengths of the hollow rectangular areas in the same group are different, as shown in the attached figure. Figure 4 As shown in , the extension lengths of the first hollow rectangular area 111, the second hollow rectangular area 112, and the third hollow rectangular area 113 of the constant thickness comparison test block gradually increase. The design of each step area of ​​the variable thickness comparison test block 2 is the same, that is, multiple defect characterization areas are designed in the ply of the three-dimensional model of the comparison test block, including: A plurality of defect characterization regions are designed in the ply of each step region of the three-dimensional model of the variable thickness comparison test block.

[0032] Taking the first defect characterization region 211 of the first step region as an example, it can be designed to be composed of three hollow rectangular regions, and the extension lengths of the hollow rectangular regions in the same group are different, as shown in the attached figure. Figure 6 As shown, the extension lengths of the first hollow rectangular area 2111, the second hollow rectangular area 2112, and the third hollow rectangular area 2113 of the variable thickness comparison test block gradually increase. More specifically, the width of each hollow rectangular area is equal to the print line width of the 3D printer, and the height is equal to the print layer thickness of the 3D printer. In other words, the width and height (i.e., thickness) of each hollow rectangular area in the segmented setting are set as above, allowing it to more accurately and realistically reflect the cause of the filament missing defect.

[0033] S30: Convert the target three-dimensional model of the comparison test block into a file format and import it into a slicing software for slicing to generate a 3D printing target trajectory code.

[0034] During the specific implementation process, the three-dimensional model of the comparison test block designed in the above steps is recorded as the target three-dimensional model, which is converted into a file format usable by the 3D printing slicing software and imported into the slicing software for slicing, completing the model slicing of the comparison test block and the generation of the 3D printing trajectory code.

[0035] S40: importing the 3D printing target trajectory code into the 3D printing device and performing 3D printing to obtain a non-destructive testing laminate comparison test block.

[0036] During the specific implementation process, the 3D printing target trajectory code is used as the basis for the preparation of the comparison test block, which is imported into the 3D printing equipment. The printing filament with the same thermoplasticity and material as the part to be non-destructively tested is selected for printing to complete the preparation of the non-destructive testing laminate comparison test block. The pre-designed defects are retained during the printing process to simulate the filament missing defects that occur in real printing conditions.

[0037] In this embodiment, a non-destructive testing laminate comparison test block is constructed by pre-designing defects to solve the problem that the internal quality of thermoplastic composite 3D printed parts cannot be checked. Since the embedded defects affect the non-destructive testing laminate in the thickness direction, a three-dimensional model of the comparison test block is first obtained according to the actual thickness of the part. Then, defects are constructed in the digital model layer of the comparison test block according to the printing parameters of the 3D printing equipment to simulate the main manifestation of filament missing, which is a fused deposition additive manufacturing 3D printing defect, to truly reflect the internal quality of the part. Finally, the digital-to-analog conversion of the comparison test block is integrated into the 3D printing process to prepare a comparison test block that can be used for the comparison and inspection of the internal quality of thermoplastic composite 3D printed parts.

[0038] Combined with specific preparation examples, the method of this application is used to further illustrate the comparison test blocks of uniform thickness and variable thickness obtained: For the comparison test blocks of equal thickness: First, the composite material part of equal thickness has a total of 48 layers, with a single layer thickness of 0.125mm, and the measured part thickness is 6mm; Secondly, CATIA 3D modeling software was used to design a flat plate comparison test block model. The ply laying sequence and number were consistent with those of composite parts of equal thickness. The size of the flat plate comparison test block model was 200mm*200mm, and the thickness was 6mm.

[0039] Using CATIA 3D modeling software, defects were pre-designed in the flat plate comparison test block model. The defect type was a hollow rectangular area with three defect specifications: lengths of 3mm, 6mm, and 9mm, respectively. The width was the 3D printer line width, and the height was the 3D printer layer thickness. A 3mm-long hollow rectangular area, a 6mm-long hollow rectangular area, and a 9mm-long hollow rectangular area were designed for the 3rd ply. A 3mm-long hollow rectangular area, a 6mm-long hollow rectangular area, and a 9mm-long hollow rectangular area were designed for the 24th ply. A 3mm-long hollow rectangular area, a 6mm-long hollow rectangular area, and a 9mm-long hollow rectangular area were designed for the 46th ply. The hollow rectangular areas in each ply were evenly staggered, completing the design of the flat plate comparison test block model, i.e., the design of the equal-thickness comparison test block 1.

[0040] Then, the designed flat plate comparison test block model is converted into a file format that can be used by the 3D printing slicing software, imported into the slicing software, and the slicing of the comparison test block and the generation of the 3D printing trajectory code are completed.

[0041] Finally, the 3D printing trajectory code is imported into the 3D printing equipment, and the same thermoplastic composite printing filament as the part to be non-destructively tested is selected to complete the 3D printing non-destructive testing laminate and the manufacture of the equal thickness comparison test block.

[0042] For the comparison test piece with variable thickness: First, the variable thickness composite material part has a total of 80 layers, including 20 full layers and 60 missing layers. The thickness of each layer is 0.125mm. The maximum thickness of the measured part is 10mm, the minimum thickness is 2mm, and the calculated average thickness is 6mm. Secondly, CATIA 3D modeling software was used to design a stepped comparison test block model. The ply laying sequence and quantity were consistent with those of composite parts of equal thickness. The stepped comparison test block model had a size of 400mm*400mm, with a total of 4 steps. The size of each step was 100mm*400mm, and the thickness of each step was 2mm, 4mm, 6mm, and 10mm respectively.

[0043] Using CATIA 3D modeling software, defects were pre-designed in each step of the stepped comparison test block model. The defect type was a hollow rectangular area, and there were three defect specifications: lengths of 3mm, 6mm, and 9mm, respectively. The width was the 3D printer line width, and the height was the 3D printer layer thickness. On the 5th layer of the 10mm thick step, a 3mm-long hollow rectangular area, a 6mm-long hollow rectangular area, and a 9mm-long hollow rectangular area were designed. On the 40th layer, a 3mm-long hollow rectangular area, a 6mm-long hollow rectangular area, and a 9mm-long hollow rectangular area were designed. On the 75th layer, a 3mm-long hollow rectangular area, a 6mm-long hollow rectangular area, and a 9mm-long hollow rectangular area were designed. The hollow rectangular areas of each layer were evenly staggered, completing the defect design of the 10mm-thick step of the stepped comparison test block model.

[0044] Similarly, the defect design of the 2mm, 4mm, and 6mm thickness step areas refers to the design method of the 10mm thickness step to complete the design of the stepped comparison test block model, that is, the design of the variable thickness comparison test block 2.

[0045] Then, the designed stepped comparison test block model is converted into a file format that can be used by 3D printing slicing software, imported into the slicing software, and the slicing of the comparison test block and the generation of the 3D printing trajectory code are completed; Finally, the 3D printing trajectory code is imported into the 3D printing equipment, and the same thermoplastic composite printing filament as the part to be non-destructively tested is selected to complete the 3D printing non-destructive testing laminate and the manufacture of variable thickness comparison test blocks.

[0046] Refer to the attached Figure 7 Based on the same inventive concept as in the aforementioned embodiment, the present embodiment further provides a device for obtaining a comparison test block for a composite 3D printed non-destructive testing laminate, comprising: The model acquisition module is used to obtain a three-dimensional model of the comparison test block according to the thickness of the workpiece to be non-destructively tested; A defect design module is used to design a plurality of defect representation areas in the ply of the three-dimensional model of the comparison test block according to the printing parameters of the 3D printing device used for printing, so as to obtain a target three-dimensional model of the comparison test block; The model conversion module is used to convert the target three-dimensional model of the comparison test block into a file format and import it into the slicing software for slicing, thereby generating a 3D printing target trajectory code; The printing preparation module is used to import the 3D printing target trajectory code into the 3D printing device and perform 3D printing to obtain a non-destructive testing laminate comparison test block.

[0047] Those skilled in the art should understand that the division of the various modules in the embodiment is only a division of logical functions. In actual application, they can be fully or partially integrated into one or more actual carriers, and these modules can all be implemented in the form of software called by the processing unit, or all in the form of hardware, or in the form of a combination of software and hardware. It should be noted that the modules in the device for obtaining a comparison test block for composite 3D printing non-destructive testing laminates in this embodiment correspond one to one to the steps in the method for obtaining a comparison test block for composite 3D printing non-destructive testing laminates in the aforementioned embodiment. Therefore, the specific implementation of this embodiment can refer to the implementation of the aforementioned method for obtaining a comparison test block for composite 3D printing non-destructive testing laminates, and will not be repeated here.

[0048] Based on the same inventive concept as in the aforementioned embodiment, an embodiment of the present application further provides a computer-readable storage medium storing a computer program. When the computer program is loaded and executed by a processor, the method for obtaining a comparison test block for a composite 3D printed non-destructive testing laminate is implemented as provided in the embodiment of the present application.

[0049] Based on the same inventive concept as in the above embodiment, an embodiment of the present application further provides an electronic device, including a processor and a memory, wherein: Memory is used to store computer programs; The processor is used to load and execute a computer program so that the electronic device executes the method for obtaining a composite 3D printed non-destructive testing laminate comparison test block as provided in the embodiment of the present application.

[0050] In some embodiments, the computer-readable storage medium may be a memory device such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface mount memory, optical disk, or CD-ROM; or various devices including any one or any combination of the above memories. The computer may be various computing devices including smart terminals and servers.

[0051] In some embodiments, executable instructions may be in the form of a program, software, software module, script, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.

[0052] As an example, executable instructions may, but need not, correspond to a file in a file system, may be stored as part of a file that stores other programs or data, such as in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinating files (e.g., files storing one or more modules, subroutines, or code portions).

[0053] By way of example, executable instructions may be deployed to be executed on one computing device, or on multiple computing devices at one site, or on multiple computing devices distributed across multiple sites and interconnected by a communication network.

[0054] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0055] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0056] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory / random access memory, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a multimedia terminal device (which can be a mobile phone, a computer, a television receiver, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0057] In summary, the embodiments of the present application provide a method, device, medium and equipment for obtaining a composite 3D printed non-destructive testing laminate comparison block. The method includes: obtaining a three-dimensional model of the comparison block according to the thickness of the workpiece to be non-destructively tested; designing multiple defect characterization areas in the ply of the three-dimensional model of the comparison block according to the printing parameters of the 3D printing device used for printing, and obtaining a target three-dimensional model of the comparison block; converting the target three-dimensional model of the comparison block into a file format and importing it into a slicing software for slicing to generate a 3D printing target trajectory code; importing the 3D printing target trajectory code into a 3D printing device and performing 3D printing to obtain a non-destructive testing laminate comparison block. This application constructs a non-destructive testing laminate comparison test block by pre-designing defects to solve the problem that the internal quality of thermoplastic composite 3D printed parts cannot be checked. Since the embedded defects affect the non-destructive testing laminate in the thickness direction, the three-dimensional model of the comparison test block is first obtained according to the actual thickness of the part. Then, defects are constructed in the digital model layer of the comparison test block according to the printing parameters of the 3D printing equipment to simulate the main manifestation of filament missing, which is a fused deposition additive manufacturing 3D printing defect, to truly reflect the internal quality of the part. Finally, the digital-to-analog conversion of the comparison test block is integrated into the 3D printing process to prepare a comparison test block that can be used for the comparison and inspection of the internal quality of thermoplastic composite 3D printed parts.

[0058] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for obtaining a comparison test block for composite 3D printing non-destructive testing laminate, characterized in that: The following steps are involved: Obtain a three-dimensional model of the comparison test block based on the thickness of the workpiece to be non-destructively tested; According to the printing parameters of the 3D printing device used for printing, a plurality of defect characterization areas are designed in the ply of the three-dimensional model of the comparison test block to obtain a target three-dimensional model of the comparison test block; Convert the target three-dimensional model of the comparison test block into a file format and import it into a slicing software for slicing to generate a 3D printing target trajectory code; The 3D printing target trajectory code is imported into a 3D printing device and 3D printed to obtain a non-destructive testing laminate comparison test block.

2. The method for obtaining a comparison test block for composite 3D printing non-destructive testing laminate according to claim 1, characterized in that: The plurality of defect characterization regions are evenly distributed along the length direction of the comparison test block and change in a step-wise manner in the thickness direction of the comparison test block.

3. The method for obtaining a comparison test block for composite 3D printing non-destructive testing laminate according to claim 2, characterized in that: Each of the defect representation areas includes a plurality of hollow rectangular areas extending along the width direction of the comparison test block, and the extension lengths of the plurality of hollow rectangular areas in the same defect representation area are different.

4. The method for obtaining a comparison test block for composite 3D printing non-destructive testing laminate according to claim 3, characterized in that: The width of the hollow rectangular area is equal to the printing line width of the 3D printing device, and the height is equal to the printing layer thickness of the 3D printing device.

5. The method for obtaining a composite 3D printed non-destructive testing laminate comparison test block according to claim 1, characterized in that: The method of obtaining a three-dimensional model of a comparison test block according to the thickness of the workpiece to be non-destructively tested comprises: According to the thickness of the workpiece to be nondestructively tested, a three-dimensional model of a comparison test block of uniform thickness or a three-dimensional model of a comparison test block of variable thickness is obtained; wherein the three-dimensional model of the comparison test block of variable thickness is a step-shaped test block with a step-like change.

6. The method for obtaining a comparison test block for composite 3D printing non-destructive testing laminate according to claim 5, characterized in that: The three-dimensional model of the variable thickness comparison test block includes at least three stepped areas, and the thicknesses of the three stepped areas correspond to the minimum thickness, the middle thickness and the maximum thickness of the workpiece to be non-destructively tested, respectively.

7. The method for obtaining a composite 3D printed non-destructive testing laminate comparison test block according to claim 6, characterized in that: The plurality of defect characterization areas are designed in the ply of the three-dimensional model of the comparison test block, including: A plurality of defect characterization regions are designed in the plies of each step region of the three-dimensional model of the variable thickness comparison test block.

8. A device for obtaining a comparison test block for a composite 3D printed non-destructive testing laminate, characterized in that: include: The model acquisition module is used to obtain a three-dimensional model of the comparison test block according to the thickness of the workpiece to be non-destructively tested; a defect design module, configured to design a plurality of defect characterization regions in the ply of the three-dimensional model of the comparison test block according to printing parameters of a 3D printing device used for printing, so as to obtain a target three-dimensional model of the comparison test block; A model conversion module, used to convert the target three-dimensional model of the comparison test block into a file format and import it into a slicing software for slicing, thereby generating a 3D printing target trajectory code; The printing preparation module is used to import the 3D printing target trajectory code into the 3D printing device and perform 3D printing to obtain a non-destructive testing laminate comparison test block.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is loaded and executed by the processor, the method for obtaining a composite 3D printed non-destructive testing laminate comparison test block according to any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that: comprising a processor and a memory, wherein: The memory is used to store computer programs; The processor is configured to load and execute the computer program so as to enable the electronic device to perform the method for obtaining a composite 3D printed non-destructive testing laminate comparison test block according to any one of claims 1 to 7.

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