A titanium alloy bracket 3D printing model construction method and system

Abstract

The present application provides a method and system for constructing a 3D printing model of a titanium alloy bracket, which collects slice images of each slice layer in a bracket simulation model; extracts the support contour of each slice layer and the support gap between adjacent slice layers from each slice image; performs interlayer compensation on the standard printing interval of the titanium alloy bracket based on the shape characteristics of each support gap, and obtains the compensation value of the printing interval between adjacent slice layers; then performs interlayer constraints on the 3D printing strategy of the titanium alloy bracket based on the compensation values ​​of all printing intervals and the support contour of each slice layer, and obtains the collaborative constraint conditions for the layered printing of the titanium alloy bracket; based on the collaborative constraint conditions for the layered printing, all slice layers are integrated into a 3D printing model of the titanium alloy bracket, and then the 3D printing model is used to perform layered printing on the titanium alloy bracket; based on the above scheme, layered improvement of support stability in 3D printing of titanium alloy brackets can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of titanium alloy bracket production, and more specifically, to a method and system for constructing a 3D printing model of a titanium alloy bracket. Background Art

[0002] Titanium alloys are widely used in aerospace, medical implants, and high-performance structural parts due to their excellent mechanical properties, corrosion resistance, and biocompatibility. In the medical field, titanium alloy stents are widely used in orthopedic, dental, and other implants. Especially in personalized medicine, titanium alloy stents have important application value.

[0003] In traditional 3D printing technology, the printing interval between adjacent slice layers of titanium alloy brackets usually adopts fixed parameter settings. This approach fails to fully consider the actual gap requirements between different slice layers. Factors such as the printing characteristics, support structure, and material fluidity of each layer may vary due to changes in factors such as layer height, printing path, and printing speed. Since the printing interval is set to a fixed level, there may be excessive gaps between certain layers, resulting in the molten material failing to effectively bond, causing insufficient interlayer bonding strength, and ultimately affecting the overall strength and stability of the bracket. Therefore, how to achieve layered improvement of support stability in 3D printing of titanium alloy brackets has become a difficult problem facing the industry. Summary of the Invention

[0004] The present application provides a method and system for constructing a 3D printing model of a titanium alloy bracket, which can achieve layered improvement in support stability during 3D printing of a titanium alloy bracket.

[0005] In a first aspect, the present application provides a method for constructing a 3D printing model of a titanium alloy stent, comprising:

[0006] Constructing a stent simulation model of the titanium alloy stent to be printed, dividing the stent simulation model into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then acquiring slice images of each slice layer;

[0007] Determining support point distribution information in the stent simulation model through the support structure of the titanium alloy stent, and extracting the support contour of each slice layer and the support gap between adjacent slice layers from each slice image based on the support point distribution information;

[0008] Based on the shape characteristics of each support gap, the standard printing interval of the titanium alloy stent is compensated between layers to obtain the compensation value of the printing interval between adjacent slice layers. Then, based on the compensation value of all printing intervals and the support contour of each slice layer, the interlayer constraint of the 3D printing strategy of the titanium alloy stent is performed, and the collaborative constraint conditions for the layered printing of the titanium alloy stent are obtained.

[0009] Based on the collaborative constraints of the layered printing, all slice layers are integrated into a 3D printing model of the titanium alloy bracket.

[0010] In some embodiments, determining the support point distribution information in the stent simulation model based on the support structure of the titanium alloy stent specifically includes:

[0011] Obtain the support structure of the titanium alloy stent;

[0012] Performing mechanical analysis on the support structure to obtain multiple support points of the titanium alloy bracket, and then determining the distribution coordinates and support forces of each support point;

[0013] The support point distribution information in the bracket simulation model is determined through all distribution coordinates and support forces.

[0014] In some embodiments, extracting the support contour of each slice layer and the support gap between adjacent slice layers from each slice image according to the support point distribution information specifically includes:

[0015] For each slice layer, extracting support features of the slice layer from the support point distribution information;

[0016] Extracting the support contour of the slice layer from the slice image of the slice layer by using the support feature, and then obtaining the support contour of each slice layer;

[0017] For the support gap between each group of adjacent slice layers, the support features of each slice layer in the adjacent slice layers are obtained;

[0018] The support gaps between adjacent slice layers are determined by all the support features, and then the support gaps between each group of adjacent slice layers are obtained.

[0019] In some embodiments, interlayer compensation is performed on the standard printing interval of the titanium alloy stent based on the shape characteristics of each support gap, and the compensation value of the printing interval between adjacent slice layers is obtained, specifically including:

[0020] Obtain the standard printing interval between adjacent slice layers of the titanium alloy bracket under the current printing process;

[0021] For each group of adjacent slice layers, the shape features of the support gap between the adjacent slice layers are extracted;

[0022] determining a correlation factor between the printing interval and the support gap shape based on the shape feature;

[0023] The standard printing interval is adjusted according to the correlation factor to obtain a compensation value of the printing interval between adjacent slice layers, and further obtain a compensation value of the printing interval between each group of adjacent slice layers.

[0024] In some embodiments, interlayer constraints are applied to the 3D printing strategy of the titanium alloy stent based on the compensation values ​​of all printing intervals and the support profiles of each slice layer, and the collaborative constraint conditions for the layered printing of the titanium alloy stent are obtained, specifically including:

[0025] Obtain the standard 3D printing strategy for titanium alloy stents under current printing technology;

[0026] For each slice layer, extracting a standard printing path for the slice layer and a standard interval before and after layer printing from the 3D printing strategy;

[0027] The standard interval is adjusted for stability by using a compensation value of the printing interval of the slice layer before and after layered printing to obtain a correction interval of the slice layer before and after printing;

[0028] Adjusting the support stability of the standard printing path according to the support profile of the slice layer to obtain a stable path for the slice layer during printing;

[0029] The collaborative constraint conditions for layered printing of the titanium alloy bracket are determined based on the stable path and all correction intervals.

[0030] In some embodiments, integrating all slice layers into a 3D printing model of a titanium alloy stent based on the collaborative constraints of the layered printing specifically includes:

[0031] The collaborative constraint conditions of the layered printing are used as integration conditions between adjacent slice layers, and interlayer integration is performed on all slice layers to obtain a 3D printed model of the titanium alloy bracket.

[0032] In some embodiments, a computer scanning device is used to acquire slice images of each slice layer.

[0033] In a second aspect, the present application provides a titanium alloy stent 3D printing model construction system, comprising:

[0034] A layered acquisition module is used to construct a stent simulation model of the titanium alloy stent to be printed, divide the stent simulation model into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then acquire slice images of each slice layer;

[0035] a processing module, configured to determine support point distribution information in the stent simulation model based on the support structure of the titanium alloy stent, and extract support contours of each slice layer and support gaps between adjacent slice layers from each slice image based on the support point distribution information;

[0036] The processing module is further configured to perform interlayer compensation on the standard printing interval of the titanium alloy stent according to the shape characteristics of each support gap, obtain a compensation value for the printing interval between adjacent slice layers, and then perform interlayer constraints on the 3D printing strategy of the titanium alloy stent according to the compensation values ​​of all printing intervals and the support profile of each slice layer, thereby obtaining collaborative constraint conditions for layered printing of the titanium alloy stent;

[0037] An execution module is used to integrate all slice layers into a 3D printing model of the titanium alloy bracket based on the collaborative constraint conditions of the layered printing.

[0038] In a third aspect, the present application provides a computer device comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned titanium alloy bracket 3D printing model construction method.

[0039] In a fourth aspect, the present application provides a computer-readable storage medium, in which instructions or codes are stored. When the instructions or codes are run on a computer, the computer implements the above-mentioned method for constructing a 3D printing model of a titanium alloy bracket.

[0040] The technical solutions provided by the embodiments disclosed in this application have the following beneficial effects:

[0041] The present application provides a method and system for constructing a 3D printing model of a titanium alloy bracket, in which a titanium alloy bracket to be printed is constructed as a bracket simulation model, and the bracket simulation model is divided into multiple slice layers based on the structural characteristics of the titanium alloy bracket, and then slice images of each slice layer are collected; the support point distribution information in the bracket simulation model is determined by the support structure of the titanium alloy bracket, and the support contour of each slice layer and the support gap between adjacent slice layers are extracted from each slice image based on the support point distribution information; the standard printing interval of the titanium alloy bracket is interlayer compensated according to the shape characteristics of each support gap to obtain the compensation value of the printing interval between adjacent slice layers, and then the 3D printing strategy of the titanium alloy bracket is interlayer constrained according to the compensation values ​​of all printing intervals and the support contour of each slice layer to obtain the collaborative constraint conditions for the layered printing of the titanium alloy bracket; all slice layers are integrated into a 3D printing model of the titanium alloy bracket based on the collaborative constraint conditions for the layered printing.

[0042] It can be seen that in this application, all the slice layers are integrated into a 3D printing model of the titanium alloy bracket based on the collaborative constraint conditions of layered printing; first, by extracting the support contour of each slice layer and the support gap between adjacent slice layers, the structural relationship between each slice layer and its support effect can be accurately captured, so that it can be judged whether the support structure can be evenly distributed and fully support each part of the bracket, avoiding problems such as displacement, distortion or cracks during the printing process due to insufficient support, and helping to adjust the printing interval through inter-layer compensation, optimize printing accuracy, and enhance printing quality, so as to achieve the optimization of the support structure between slice layers, effectively improve the support stability, and thus improve the reliability and accuracy of 3D printing of titanium alloy brackets; then, The support profile of each slice layer and the support gap between adjacent slice layers are combined to improve the 3D printing strategy in a layered manner. The printing path and support position can be optimized without affecting the main structure of the bracket, ensuring the balance and stability between each layer. Determining a stable strategy helps to avoid deformation, collapse or position displacement caused by uneven printing intervals or insufficient support, thereby ensuring the stability of the support during the printing process. At the same time, the collaborative constraints of layered printing can more finely adjust the printing parameters, improve the support effect, and ensure the stability of the titanium alloy bracket during the printing process, thereby significantly improving the printing accuracy and the mechanical properties of the final bracket. In summary, based on the above scheme, a layered improvement of support stability in 3D printing of titanium alloy brackets can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0044] Figure 1 is an exemplary flow chart of a method for constructing a 3D printing model of a titanium alloy stent according to some embodiments of the present application;

[0045] Figure 2 3D printing process of a titanium alloy stent according to some embodiments of the present application;

[0046] Figure 3 is a schematic diagram of a process for determining a compensation value according to some embodiments of the present application;

[0047] Figure 4 This is a schematic diagram of the structure of a titanium alloy stent 3D printing model construction system according to some embodiments of the present application;

[0048] Figure 5It is a structural schematic diagram of a computer device for implementing a method for constructing a 3D printing model of a titanium alloy bracket according to some embodiments of the present application. DETAILED DESCRIPTION

[0049] In order to better understand the technical solution of the present application, the technical solution of the present application will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0050] refer to Figure 1 , which is an exemplary flow chart of a method for constructing a 3D printing model of a titanium alloy stent according to some embodiments of the present application. The method for constructing a 3D printing model of a titanium alloy stent mainly includes the following steps:

[0051] In step 101, a titanium alloy stent to be printed is constructed as a stent simulation model, and the stent simulation model is divided into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then slice images of each slice layer are collected.

[0052] It should be noted that, in this application, the bracket simulation model refers to a computer simulation model constructed based on the geometric structure and physical properties of the titanium alloy bracket; the structural characteristics of the titanium alloy bracket refer to the inherent geometric and mechanical properties of the titanium alloy bracket, and the structural characteristics include shape, size and complexity; the slice layer is a parallel layer used to print the bracket simulation model in layers, and the thickness of each slice layer ranges from a few microns to a few millimeters; the slice image refers to the two-dimensional projection image of each slice layer.

[0053] In specific implementation, 3D modeling software (e.g., SolidWorks) is used to convert the 3D structural design of the titanium alloy stent to be printed into a digital model as a stent simulation model. The structural characteristics of the titanium alloy stent are obtained from the design description of the titanium alloy stent. The structural characteristics of the titanium alloy stent can be input into slicing software (e.g., Cura). The software will generate slice thicknesses and printing parameters for different areas of the titanium alloy stent based on the structural characteristics. The slicing software can then be used to decompose the stent simulation model into multiple cross sections as slice layers, and then a computer scanning device (e.g., CT scanning device) can be used to collect slice images of each slice layer.

[0054] In some embodiments, reference Figure 2The figure is a schematic diagram of the 3D printing process for a titanium alloy stent according to some embodiments of the present application. This figure illustrates the general 3D printing process. First, it begins with a (A) CAD model, a three-dimensional computer-aided design model that defines the shape and structure of the object to be printed. Next, this CAD model undergoes a (B) slicing process, which breaks the 3D model into a series of thin layers, providing instructions for the 3D printer to build the object layer by layer. This sliced ​​data is then converted into a (C) STL file, a standard 3D printing file format that contains the model's geometric information. Finally, the 3D printer performs (D) layer-by-layer stacking based on the information in the STL file, printing material layer by layer until the entire object is constructed. This process embodies the complete 3D printing process from design to physical manufacturing.

[0055] In step 102, support point distribution information in the stent simulation model is determined by the support structure of the titanium alloy stent, and support contours of each slice layer and support gaps between adjacent slice layers are extracted from each slice image based on the support point distribution information.

[0056] In some embodiments, determining the support point distribution information in the stent simulation model based on the support structure of the titanium alloy stent can be achieved by using the following steps:

[0057] Obtain the support structure of the titanium alloy stent;

[0058] Performing mechanical analysis on the support structure to obtain multiple support points of the titanium alloy bracket, and then determining the distribution coordinates and support forces of each support point;

[0059] The support point distribution information in the bracket simulation model is determined through all distribution coordinates and support forces.

[0060] In specific implementation, first, the support structure of the titanium alloy bracket can be obtained in the following manner, namely: the support structure of the titanium alloy bracket can be obtained from the design description of the titanium alloy bracket; then, the support structure is mechanically analyzed to obtain multiple support points of the titanium alloy bracket, and then the distribution coordinates and support force of each support point can be determined in the following manner, namely: the finite element analysis method can be used to simulate the external force applied during the printing process (the sum of gravity and thermal stress caused by temperature change) to realize multiple support points of the titanium alloy bracket during the printing process. For each support point, the center of gravity of the titanium alloy bracket is used as the coordinate origin to establish a three-dimensional coordinate system, the coordinates of the support point position are used as the distribution coordinates of the support point, and the external force borne by the support point is used as the support force of the support point. The distribution coordinates and support force of each support point can be obtained in the above manner; finally, the support point distribution information in the bracket simulation model can be determined by all the distribution coordinates and support forces. The above manner can be used, namely: the set of all distribution coordinates and support forces is used as the support point distribution information in the bracket simulation model.

[0061] It should be noted that the support point distribution information represents the spatial distribution and mechanical properties of all support points in the titanium alloy bracket simulation model; the support structure represents the support component structure used to enhance printing stability and prevent deformation; the support point represents the key action point in the support structure, the distribution coordinates represent the position parameters of the support point in three-dimensional space, and the support force represents the mechanical action that the support point bears during the printing process.

[0062] In some embodiments, extracting the support contour of each slice layer and the support gap between adjacent slice layers from each slice image according to the support point distribution information can be achieved by using the following steps:

[0063] For each slice layer, extracting support features of the slice layer from the support point distribution information;

[0064] Extracting the support contour of the slice layer from the slice image of the slice layer by using the support feature, and then obtaining the support contour of each slice layer;

[0065] For the support gap between each group of adjacent slice layers, the support features of each slice layer in the adjacent slice layers are obtained;

[0066] The support gaps between adjacent slice layers are determined by all the support features, and then the support gaps between each group of adjacent slice layers are obtained.

[0067] In specific implementation, first, for each slice layer, the support features of the slice layer are extracted from the support point distribution information, which can be implemented in the following manner, namely: for each slice layer, the distribution coordinates of each support point in the slice layer are obtained from the support point distribution information as the slice support point, and the set of distribution coordinates and support forces of all slice support points can be used as the support feature of the slice layer; secondly, the support contour of the slice layer is extracted from the slice image of the slice layer through the support features, and then the support contour of each slice layer is obtained, which can be implemented in the following manner, namely: for each slice support point, the position of each slice support point is marked in the slice image of the slice layer, and the normal vector parameter equation is used to make the normal vector at the position, the magnitude of the normal vector is the support force of the slice support point, and the coordinate point at the end point of the normal vector is used as the support force coordinate of the slice support point. The support force coordinates of each slice support point can be obtained in the above manner, and all support force coordinates can be connected into a unique closed loop as the support contour of the slice layer. The support contour of each slice layer can be obtained in the above manner.

[0068] Then, in the specific implementation, for the support gap between each group of adjacent slice layers, obtaining the support features of each slice layer in the adjacent slice layers can be achieved in the following way, namely: for the support gap between each group of adjacent slice layers, obtain the support features of each slice layer in the adjacent slice layers from the above steps; finally, determine the support gap between the adjacent slice layers through all the support features, and then obtain the support gap between each group of adjacent slice layers. It can be achieved in the following way, namely: for each slice layer in the adjacent slice layers, calculate the average of all support forces in the support features of the slice layer as the support feature value of the slice layer. The support feature value of each slice layer can be obtained in the above way, and the absolute value of the difference between the two support feature values ​​can be used as the support gap between the adjacent slice layers. The support gap between each group of adjacent slice layers can be obtained in the above way.

[0069] It should be noted that in this application, the support gap refers to the spatial area between adjacent slice layers used to form the support structure; the support contour refers to the boundary shape and distribution characteristics of the support structure in the slice layer; and the support feature is a quantitative value used to measure the geometric shape and mechanical distribution characteristics of the support structure.

[0070] In step 103, interlayer compensation is performed on the standard printing interval of the titanium alloy bracket according to the shape characteristics of each support gap to obtain the compensation value of the printing interval between adjacent slice layers. Then, interlayer constraints are performed on the 3D printing strategy of the titanium alloy bracket according to the compensation values ​​of all printing intervals and the support contours of each slice layer to obtain the collaborative constraint conditions for the layered printing of the titanium alloy bracket.

[0071] In some embodiments, the standard printing interval of the titanium alloy stent is compensated for between layers according to the shape characteristics of each support gap, and the compensation value of the printing interval between adjacent slice layers is obtained. Figure 3 As described above, the figure is a schematic diagram of the process of determining the compensation value in some embodiments of the present application. In this embodiment, determining the compensation value can be achieved by using the following steps:

[0072] In step 1031, a standard printing interval between adjacent slice layers of the titanium alloy stent under the current printing process is obtained;

[0073] In step 1032, for each group of adjacent slice layers, shape features of the support gap between adjacent slice layers are extracted;

[0074] In step 1033, a correlation factor between the printing interval and the support gap shape is determined based on the shape feature;

[0075] In step 1034, the standard printing interval is adjusted according to the correlation factor to obtain a compensation value for the printing interval between adjacent slice layers, and further obtain a compensation value for the printing interval between each group of adjacent slice layers.

[0076] In specific implementation, first, obtaining the standard printing interval between adjacent slice layers of the titanium alloy bracket under the current printing process can be achieved in the following manner, namely: obtaining the standard printing interval between adjacent slice layers of the titanium alloy bracket under the current printing process from the printing equipment description of the titanium alloy bracket; secondly, for each group of adjacent slice layers, extracting the shape characteristics of the support gap between adjacent slice layers can be achieved in the following manner, namely: for each group of adjacent slice layers, obtaining the support contour corresponding to the support gap between adjacent slice layers, and using an image processing algorithm (for example: edge detection) to extract the spatial layout, shape, size and distance between each support point of the support contour as the shape characteristics of the support gap between adjacent slice layers; then, determining the relationship between the printing interval and the shape of the support gap based on the shape characteristics. The correlation factor can be implemented in the following manner, namely: the finite element analysis method can be used to perform a large number of simulations on the influence of the shape feature on the printing interval, and the correlation value between the printing interval and the support gap shape of each simulation output is obtained, so that the average of all correlation values ​​can be used as the correlation factor between the printing interval and the support gap shape; finally, the standard printing interval is adjusted according to the correlation factor to obtain the compensation value of the printing interval between adjacent slice layers, and then the compensation value of the printing interval between each group of adjacent slice layers is obtained. This can be implemented in the following manner, namely: the correlation factor is used as the adjustment coefficient of the standard printing interval, and the product of the adjustment coefficient and the standard printing interval is used as the compensation value of the printing interval between adjacent slice layers. The compensation value of the printing interval between each group of adjacent slice layers can be obtained in the above manner.

[0077] It should be noted that, in this application, the compensation value is a correction parameter used to adjust the printing error to optimize the interlayer bonding quality; the standard printing interval represents the default interlayer printing time interval between adjacent slice layers; the shape feature represents the geometric morphological parameter of the support gap; the correlation factor represents the mathematical correlation parameter between the printing interval and the support gap shape feature; the finite element analysis method is a numerical calculation method used to simulate and analyze the mechanical behavior of the physical system. In this application, the finite element analysis method is used to study the influence of the shape characteristics of the support gap on the printing interval. Its technical principle is to divide the printing structure into multiple discrete finite element units, and establish partial differential equations on each finite element unit. The printing stress distribution, deformation and interlayer bonding strength under different support gap shapes are calculated by numerical solution. Through a large number of simulation experiments, the influence of different support gap shapes on the stability of the printing interval is obtained, and the correlation value between the printing interval and the support gap shape of each simulation is calculated. All the correlation values ​​are used to construct a printing interval correction model, thereby optimizing the stability of layered printing and improving printing accuracy and finished product quality.

[0078] In some embodiments, interlayer constraints are applied to the 3D printing strategy of the titanium alloy stent based on the compensation values ​​of all printing intervals and the support profiles of each slice layer. The collaborative constraint conditions for layered printing of the titanium alloy stent can be obtained by the following steps:

[0079] Obtain the standard 3D printing strategy for titanium alloy stents under current printing technology;

[0080] For each slice layer, extracting a standard printing path for the slice layer and a standard interval before and after layer printing from the 3D printing strategy;

[0081] The standard interval is adjusted for stability by using a compensation value of the printing interval of the slice layer before and after layered printing to obtain a correction interval of the slice layer before and after printing;

[0082] Adjusting the support stability of the standard printing path according to the support profile of the slice layer to obtain a stable path for the slice layer during printing;

[0083] The collaborative constraint conditions for layered printing of the titanium alloy bracket are determined based on the stable path and all correction intervals.

[0084] In specific implementation, first, obtaining the standard 3D printing strategy of the titanium alloy bracket under the current printing process can be achieved in the following manner, namely: obtaining the standard 3D printing strategy of the titanium alloy bracket under the current printing process from the printing equipment description of the titanium alloy bracket, and the 3D printing strategy includes a preset printing path for each slice layer of the titanium alloy bracket and a preset time interval before and after printing; secondly, for each slice layer, extracting the standard printing path of the slice layer and the standard interval before and after layered printing from the 3D printing strategy can be achieved in the following manner, namely: for each slice layer, the preset printing path of the slice layer in the 3D printing strategy is used as the standard printing path of the slice layer, and the preset time interval before and after printing of the slice layer in the 3D printing strategy is used as the standard interval before and after layered printing of the slice layer.

[0085] Then, in specific implementation, the stability of the standard interval is adjusted by the compensation value of the printing interval of the slice layer before and after the layered printing, and the correction interval of the slice layer before and after printing can be achieved by the following steps, namely: the sum of the compensation value of the printing interval of the slice layer before and after the layered printing and the standard interval before and after the layered printing is used as the correction interval of the slice layer before and after printing; further, the support stability of the standard printing path is adjusted by the support contour of the slice layer, and the stable path of the slice layer during printing can be achieved by the following method, namely: initialize a path planning model based on topology optimization, use the support contour of the slice layer as the constraint condition in the path planning model, and use the standard printing path as the path The adjustment optimization target in the planning model is used to optimize the printing path to optimize the density, shape and position of the support during the printing process, ensuring that the stability of the support is coordinated with the printing path, so that the printing path optimized by the path planning model is used as the stable path of the slice layer during printing; finally, the collaborative constraint conditions for the layered printing of the titanium alloy bracket are determined according to the stable path and all correction intervals. This can be achieved in the following way, namely: the stable path is used as the updated printing path in the 3D printing strategy, and each correction interval is used as the time interval before and after printing of each slice layer after the update in the 3D printing strategy, so that the updated 3D printing strategy is used as the collaborative constraint condition for the layered printing of the titanium alloy bracket.

[0086] It should be noted that in this application, the stabilization strategy is a layered printing scheme for optimizing the coordination between support stability and printing path; the 3D printing strategy refers to the overall printing scheme set before printing; the standard interval refers to the default inter-layer time interval between adjacent slice layers set before printing; the standard printing path refers to the slice layer printing trajectory set before printing; the correction interval refers to the inter-layer printing time interval after correction based on the support gap; the stable path refers to the printing trajectory after optimizing the support density, shape and position; the path planning model is a computational model based on topology optimization, which is used to optimize the printing path of the titanium alloy bracket during 3D printing, so that it can improve the stability of the structure while meeting the requirements. Printing efficiency and material utilization. Its technical principle is based on the topological optimization method combined with the mathematical optimization algorithm to adjust the material distribution in the design domain to minimize the redundancy of the support structure, while ensuring the stability and inter-layer bonding quality during the printing process. In this path planning model, the support contour of the slice layer is set as a constraint condition to ensure that the necessary support will not be weakened during the printing process, and the standard printing path is used as the optimization target. By adjusting the path, the density, shape and position of the support are more in line with the printing requirements. The optimized printing path can coordinate the matching relationship between the support structure and the printing path, reduce support redundancy, improve printing accuracy, and optimize mechanical properties, thereby improving the overall printing quality.

[0087] In step 104 , all slice layers are integrated into a 3D printing model of the titanium alloy stent based on the collaborative constraints of the layered printing.

[0088] In some embodiments, integrating all slice layers into a 3D printed model of a titanium alloy stent based on the collaborative constraints of the layered printing can be achieved by the following steps:

[0089] The collaborative constraint conditions of the layered printing are used as integration conditions between adjacent slice layers, and interlayer integration is performed on all slice layers to obtain a 3D printed model of the titanium alloy bracket.

[0090] When implementing it, choose a DC-DIW (Direct-Current Direct) A computer-aided design tool based on DC-DIW technology is used as an integration tool. The collaborative constraints of layered printing are used as the integration conditions between adjacent slice layers in the integration tool. The integration tool is used to perform interlayer integration on all slice layers, so that the integrated model can be used as a 3D printing model for the titanium alloy bracket. It should be noted that in this application, a 3D printing model refers to a three-dimensional structural data model constructed in a digital manner. The 3D printing model contains the geometric information, printing path, interlayer connection relationship and optimized printing parameters of all slice layers, and can be directly used for 3D printing equipment for manufacturing. The computer-aided design tool based on DC-DIW technology is a software system for integrated design and manufacturing. Its core principle is to control the deposition behavior of conductive ink through a direct current electric field to achieve high-precision direct writing manufacturing. It is particularly suitable for the construction of fine structures and complex support structures. In this application, the computer-aided design tool is used to process the layered printing stabilization strategy of each slice layer and serves as the core tool for interlayer integration. The support contours, printing paths and spacing of adjacent slice layers can be accurately matched after optimization, ultimately forming a complete 3D printing model, thereby improving the accuracy and stability of titanium alloy bracket printing.

[0091] It should be noted that in this application, the 3D printed model can be used as the printing target mold of the titanium alloy bracket printing device. The titanium alloy bracket printing device controls the layer-by-layer deposition of the printing material (for example, titanium alloy powder or titanium alloy wire) based on the model, and combines additive manufacturing processes such as laser melting and electron beam melting to achieve precise molding. During the printing process, the titanium alloy bracket printing device adjusts the strategy based on the layered structure and support stability in the 3D printed model to optimize the interlayer bonding strength and structural accuracy, thereby completing the layered printing of the titanium alloy bracket and ensuring that its mechanical properties and structural stability meet the design requirements.

[0092] In addition, in another aspect of the present application, in some embodiments, the present application provides a titanium alloy bracket 3D printing model construction system, referring to Figure 4 , which is a schematic diagram of the structure of a titanium alloy stent 3D printing model construction system according to some embodiments of the present application. The titanium alloy stent 3D printing model construction system includes: a layered acquisition module 201, a processing module 202 and an execution module 203, which are described as follows:

[0093] The layered acquisition module 201 in this application is mainly used to construct a stent simulation model of the titanium alloy stent to be printed, divide the stent simulation model into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then acquire slice images of each slice layer;

[0094] Processing module 202, in the present application, is used to determine support point distribution information in the stent simulation model based on the support structure of the titanium alloy stent, and extract the support contour of each slice layer and the support gap between adjacent slice layers from each slice image based on the support point distribution information;

[0095] It should be noted that the processing module 202 is further used to perform interlayer compensation on the standard printing interval of the titanium alloy stent according to the shape characteristics of each support gap, obtain the compensation value of the printing interval between adjacent slice layers, and then perform interlayer constraints on the 3D printing strategy of the titanium alloy stent according to the compensation values ​​of all printing intervals and the support contours of each slice layer, and obtain the collaborative constraint conditions for the layered printing of the titanium alloy stent;

[0096] The execution module 203 in this application is mainly used to integrate all the slice layers into a 3D printing model of the titanium alloy bracket based on the collaborative constraint conditions of the layered printing.

[0097] The above describes in detail the examples of the titanium alloy bracket 3D printing model construction method and system provided in the embodiments of the present application. It can be understood that in order to realize the above functions, the corresponding device includes hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0098] In some embodiments, the present application also provides a computer device, which includes a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned titanium alloy bracket 3D printing model construction method.

[0099] In some embodiments, reference Figure 5 The dotted line in the figure indicates that the unit or module is optional. The figure is a structural diagram of a computer device for implementing a method for constructing a 3D printing model of a titanium alloy bracket according to an embodiment of the present application. The method for constructing a 3D printing model of a titanium alloy bracket described in the above embodiment can be Figure 5 The computer device shown in the figure is implemented, and the computer device includes at least one processor 301, a memory 302 and at least one communication unit 305. The computer device can be a terminal device, a server or a chip.

[0100] The processor 301 may be a general-purpose processor or a dedicated processor. For example, the processor 301 may be a central processing unit (CPU), which may be used to control the computer device, execute software programs, and process data from the software programs. The computer device may also include a communication unit 305 for inputting (receiving) and outputting (transmitting) signals.

[0101] For example, the computer device may be a chip, the communication unit 305 may be an input and / or output circuit of the chip, or the communication unit 305 may be a communication interface of the chip, and the chip may be a component of a terminal device, a network device, or other device.

[0102] For another example, the computer device may be a terminal device or a server, and the communication unit 305 may be a transceiver of the terminal device or the server, or the communication unit 305 may be a transceiver circuit of the terminal device or the server.

[0103] The computer device may include one or more memories 302, on which a program 304 is stored. The program 304 can be executed by the processor 301 to generate instructions 303, so that the processor 301 executes the method described in the above method embodiment according to the instructions 303. Optionally, data (such as a target audit model) can also be stored in the memory 302. Optionally, the processor 301 can also read data stored in the memory 302. The data can be stored at the same storage address as the program 304, or at a different storage address from the program 304.

[0104] The processor 301 and the memory 302 may be provided separately or integrated together, for example, integrated on a system on chip (SOC) of a terminal device.

[0105] It should be understood that each step of the above method embodiment can be completed by a hardware-based logic circuit or software-based instructions in the processor 301. The processor 301 can be a CPU, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, such as discrete gates, transistor logic devices, or discrete hardware components.

[0106] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0107] For example, in some embodiments, the present application also provides a computer-readable storage medium, which stores instructions or codes. When the instructions or codes are run on a computer, the computer implements the above-mentioned titanium alloy bracket 3D printing model construction method when executing.

[0108] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0109] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for constructing a 3D printing model of a titanium alloy stent, characterized in that: The steps include: Constructing a stent simulation model of the titanium alloy stent to be printed, dividing the stent simulation model into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then acquiring slice images of each slice layer; Determining support point distribution information in the stent simulation model based on the support structure of the titanium alloy stent, and extracting the support contour of each slice layer and the support gap between adjacent slice layers from each slice image based on the support point distribution information, wherein the support point distribution information represents the spatial distribution and mechanical properties of all support points in the titanium alloy stent simulation model; Based on the shape characteristics of each support gap, the standard printing interval of the titanium alloy stent is compensated between layers to obtain the compensation value of the printing interval between adjacent slice layers. Then, based on the compensation value of all printing intervals and the support contour of each slice layer, the interlayer constraint of the 3D printing strategy of the titanium alloy stent is applied, and the collaborative constraint conditions for the layered printing of the titanium alloy stent are obtained. Integrating all slice layers into a 3D printing model of the titanium alloy bracket based on the collaborative constraints of the layered printing; The step of extracting the support contour of each slice layer and the support gap between adjacent slice layers from each slice image according to the support point distribution information specifically includes: For each slice layer, extracting support features of the slice layer from the support point distribution information; Extracting the support contour of the slice layer from the slice image of the slice layer by using the support feature, and then obtaining the support contour of each slice layer; For the support gap between each group of adjacent slice layers, the support features of each slice layer in the adjacent slice layers are obtained; The support gaps between adjacent slice layers are determined by all the support features, and then the support gaps between each group of adjacent slice layers are obtained.

2. The method according to claim 1, wherein Determining the support point distribution information in the stent simulation model through the support structure of the titanium alloy stent specifically includes: Obtain the support structure of the titanium alloy stent; Performing mechanical analysis on the support structure to obtain multiple support points of the titanium alloy bracket, and then determining the distribution coordinates and support forces of each support point; The support point distribution information in the bracket simulation model is determined through all distribution coordinates and support forces.

3. The method according to claim 1, wherein Based on the shape characteristics of each support gap, the standard printing interval of the titanium alloy bracket is compensated between layers. The compensation value of the printing interval between adjacent slice layers is obtained specifically including: Obtain the standard printing interval between adjacent slice layers of the titanium alloy bracket under the current printing process; For each group of adjacent slice layers, the shape features of the support gap between the adjacent slice layers are extracted; determining a correlation factor between the printing interval and the support gap shape based on the shape feature; The standard printing interval is adjusted according to the correlation factor to obtain a compensation value of the printing interval between adjacent slice layers, and further obtain a compensation value of the printing interval between each group of adjacent slice layers.

4. The method according to claim 1, wherein The inter-layer constraints of the 3D printing strategy of the titanium alloy stent are imposed based on the compensation values ​​of all printing intervals and the support contours of each slice layer. The collaborative constraints for the layered printing of the titanium alloy stent are as follows: Obtain the standard 3D printing strategy for titanium alloy stents under current printing technology; For each slice layer, extracting a standard printing path for the slice layer and a standard interval before and after layer printing from the 3D printing strategy; The standard interval is adjusted for stability by using a compensation value of the printing interval of the slice layer before and after layered printing to obtain a correction interval of the slice layer before and after printing; Adjusting the support stability of the standard printing path according to the support profile of the slice layer to obtain a stable path for the slice layer during printing; The collaborative constraint conditions for layered printing of the titanium alloy bracket are determined based on the stable path and all correction intervals.

5. The method according to claim 1, wherein Integrating all slice layers into a 3D printing model of a titanium alloy stent based on the collaborative constraints of the layered printing specifically includes: The collaborative constraint conditions of the layered printing are used as integration conditions between adjacent slice layers, and interlayer integration is performed on all slice layers to obtain a 3D printed model of the titanium alloy bracket.

6. The method according to claim 1, wherein Use a computer scanning device to acquire slice images of each slice layer.

7. A titanium alloy stent 3D printing model construction system, which uses the method according to any one of claims 1 to 6 to construct a titanium alloy stent 3D printing model, characterized in that: The system includes: A layered acquisition module is used to construct a stent simulation model of the titanium alloy stent to be printed, divide the stent simulation model into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then acquire slice images of each slice layer; a processing module, configured to determine support point distribution information in the stent simulation model based on the support structure of the titanium alloy stent, and extract support contours of each slice layer and support gaps between adjacent slice layers from each slice image based on the support point distribution information; The processing module is further configured to perform interlayer compensation on the standard printing interval of the titanium alloy stent according to the shape characteristics of each support gap, obtain a compensation value for the printing interval between adjacent slice layers, and then perform interlayer constraints on the 3D printing strategy of the titanium alloy stent according to the compensation values ​​of all printing intervals and the support profile of each slice layer, thereby obtaining collaborative constraint conditions for layered printing of the titanium alloy stent; An execution module is used to integrate all slice layers into a 3D printing model of the titanium alloy bracket based on the collaborative constraint conditions of the layered printing.

8. A computer device, characterized in that: The computer device includes a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the titanium alloy bracket 3D printing model construction method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed on a computer, the computer implements the method for constructing a 3D printing model of a titanium alloy bracket according to any one of claims 1 to 6.

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