A curved mesh stiffening modeling method and a modeling system

Abstract

The present application relates to a kind of curved surface grid stiffening modeling method and modeling system, belong to engineering structure optimization design technical field, for solving the one of the problems of the existing curved surface grid stiffening modeling method, the angle of muscle curved surface forming is difficult to control, the strength and rigidity of model structure are difficult to be actively optimized, modeling efficiency is low.Curved surface grid stiffening modeling method of the present application, including S100, establishing main curved surface model;S200, set the initial geometric parameter of grid muscle, establish grid muscle curved surface;S300, simulation verification and / or optimization are carried out to model, confirm that grid muscle curved surface all meet the angle of additive manufacturing forming requirement.Curved surface grid stiffening modeling method of the present application, can obtain the curved surface that meets the requirement, improve the effect of structure lightweight, improve modeling efficiency.

Description

Technical Field

[0001] This invention relates to the field of engineering structure optimization design technology, and in particular to a method and system for modeling reinforced curved meshes. Background Technology

[0002] Mesh-reinforced structures are widely used in aerospace, transportation, and other fields due to their high specific strength and specific stiffness. The skin shape of conventional mesh-reinforced structures is generally a cylinder, truncated cone, or other solid of revolution, which can be achieved using simple modeling methods such as helices and rotating arrays. However, with the increasing application of additive manufacturing technology in lightweight structure fabrication, skin shape design is gradually shifting towards curved surfaces. Therefore, modeling methods for curved mesh reinforcement has become a challenge in engineering structural optimization design and additive manufacturing technology.

[0003] Existing technologies for modeling stiffened surfaces generally employ the free deformation method. This involves first establishing a mapping relationship between a simple surface and a set of control points, then deforming the simple stiffened surface shell into a stiffened surface shell. However, this method has two drawbacks. First, because the free deformation is based on the mapping relationship, the deformation result is determined by the mapping relationship, making it difficult to directly control the forming angle of the stiffened surface. This results in the forming angle of the stiffened surface not fully conforming to the process constraints such as the forming angle in additive manufacturing. Second, since the free deformation mapping relationship is determined by the surface control points, and the positions and spacing of these control points are generally automatically generated, manual optimization is difficult. This makes it impossible to optimize the strength and stiffness of the model structure by precisely controlling the mesh tilt angle and spacing. Summary of the Invention

[0004] Based on the above analysis, this invention aims to provide a method and system for modeling stiffened curved meshes, addressing one of the problems of existing methods: difficulty in controlling the forming angle of the stiffened surface, difficulty in actively optimizing the strength and stiffness of the model structure, and low modeling efficiency. This invention achieves its objective primarily through the following technical solutions.

[0005] A first aspect of the present invention provides a method for modeling stiffened curved surface meshes, comprising the following steps: S100, Establish the model of the main surface; S200. Set the initial geometric parameters of the mesh reinforcement and establish the model of the mesh reinforcement surface; S300. Perform simulation verification and / or optimization on the model to confirm that the mesh rib surfaces all meet the requirements of additive manufacturing forming angles.

[0006] Furthermore, step S100 also includes generating a non-rotational irregular surface.

[0007] Furthermore, step S100 also includes the following steps: S110. Set the edge curve of at least one end of the main surface to a planar curve; S120. Determine the height parameters of the main surface and the dimension parameters of at least the two end edges; S130. Generate the model of the main surface based on the dimensional parameters of the main surface.

[0008] Furthermore, S200 also includes: determining the additive manufacturing direction F and the bottom edge of the main surface, wherein the bottom edge curve L1 of the main surface is a planar curve.

[0009] Furthermore, the initial geometric parameters in step S200 include: mesh tilt angle θ, mesh spacing H, and mesh rib height W.

[0010] Furthermore, S200 also includes: generating the mesh curve CL on the main surface.

[0011] Furthermore, S200 also includes: constructing the normal segment of the main surface at the intersection of each grid curve CL.

[0012] Furthermore, the length of the normal segment is equal to the height W of the mesh reinforcement.

[0013] Furthermore, S200 also includes: using each mesh curve CL and normal segment as the framework for the mesh reinforcement surface, and constructing each mesh reinforcement surface.

[0014] Furthermore, S200 also includes that the modeling sequence of the mesh rib surface is consistent with the additive direction. Taking the bottom edge mesh intersection point P1 on the bottom edge curve L1 as the modeling starting point, the mesh curve point Pn is determined layer by layer according to the mesh tilt angle θ and the mesh spacing H, and then the position of the mesh curve CL on the main surface is determined, and finally the modeling of the mesh rib surface (2) is completed.

[0015] Furthermore, S200 also includes the following steps: S210. Determine the additive manufacturing direction and the bottom edge of the main surface. The bottom edge curve L1 of the main surface is a planar curve. S220. Construct a set of planes at equal intervals that are parallel to the bottom plane of the main surface, and construct the set of intersection lines LS between the plane set and the main surface. S230. Set the initial geometric parameters of the mesh reinforcement surface. The initial geometric parameters of the mesh reinforcement surface include: mesh tilt angle θ, mesh spacing H, and mesh reinforcement height W. S240. Set the mesh reinforcement surfaces to intersect at the bottom edge of the main surface, and determine the position of the bottom edge mesh intersection point set P1S on the bottom edge curve L1 according to the mesh spacing H. S250. Based on the grid tilt angle θ, starting from the bottom grid intersection point set P1S, determine the grid curve point set PS of each grid curve CL on each layer intersection line, connect the grid curve points of each grid curve CL on each layer intersection line, and then obtain all the grid curves CL on the main surface. S260. Based on the position of each mesh curve CL, construct all mesh rib surfaces one by one.

[0016] Furthermore, S250 also includes determining the (n+1)th layer grid curve point P. n+1 Steps: S251. Given the nth layer grid curve point P. n , through P n Construct a plane perpendicular to the intersection line of the nth layer; S252. Construct the intersection point P of this plane and the line of intersection with the (n+1)th layer. n+1 '; S253, Measurement P n and P n+1 The distance d between them; S254. Take point P on the intersection line of the (n+1)th layer. n+1 , making P n+1 and P n+1 The arc length between the two points is d×tanθ.

[0017] Furthermore, S260 also includes the following steps: S261. Obtain the set of intersection points between grid curves CL; S262. At the intersection point, construct the normal segment of the principal surface. The length of the normal segment is equal to the height H of the mesh reinforcement. S263. Using the Nth mesh curve and the normal segment on the Nth mesh curve as the framework of the Nth mesh reinforcement surface, construct the Nth mesh reinforcement surface; S264, N=N+1, repeat step S263 until all the mesh reinforcement surfaces are created.

[0018] Furthermore, S300 also includes: checking the additive manufacturing forming angle of the mesh rib surface; if the check result does not meet the additive manufacturing forming requirements, then reducing the mesh tilt angle θ, and repeating S250 and S260 until all mesh rib surfaces meet the additive manufacturing forming requirements.

[0019] In a second aspect, the present invention provides a surface mesh reinforcement modeling system, which generates a surface mesh reinforcement model using the surface mesh reinforcement modeling method described in the first aspect of the present invention.

[0020] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. The surface mesh reinforcement modeling method of the present invention, by setting the initial geometric parameters of the mesh reinforcement before establishing the mesh reinforcement surface in step S200, facilitates the active control and adjustment of the mesh tilt angle and spacing, thereby optimizing the strength and stiffness of the model structure; in step S300, through the checking iteration mechanism, it is ensured that all mesh reinforcement surfaces meet the additive manufacturing forming angle requirements, which significantly improves the forming success rate and structural reliability of complex irregular surface structures in the additive manufacturing process.

[0021] 2. The surface mesh reinforcement modeling method of the present invention, by aligning the mesh reinforcement surface modeling sequence in step S200 with the additive manufacturing direction, ensures that the mesh tilt angle is directly related to the additive manufacturing angle. This allows for optimization of the additive manufacturing angle by adjusting the mesh tilt angle, mitigating the process risk of excessively small manufacturing angles during the modeling stage. This guarantees the manufacturability of the model from the outset and provides a novel approach to mesh reinforcement surface modeling. Furthermore, since the modeling sequence starts from the intersection of the bottom edge of the surface and the mesh, ensuring the symmetry of the bottom edge mesh intersection will automatically guarantee the symmetry of the mesh curves in subsequent modeling processes. Therefore, for a main surface that is inherently symmetrical, the symmetry of the mesh reinforcement surface can be guaranteed.

[0022] 3. The curved mesh reinforcement modeling method of the present invention sets the mesh tilt angle, mesh spacing and mesh reinforcement height as modeling design parameters of the curved mesh reinforcement surface in step S230, so that they can be precisely adjusted according to actual needs. Since the mesh tilt angle and mesh spacing directly affect the strength and stiffness of the mesh reinforcement structure, the precise adjustment of these two parameters can meet the modeling requirements of structural optimization design and improve the lightweight effect of the structure.

[0023] 4. The surface mesh reinforcement modeling method of the present invention determines the mesh curve point set of each layer of intersection line by iteratively determining it layer by layer in step S250, thereby realizing the accurate tracking and positioning of the mesh curve on the complex surface, ensuring the continuity and consistency of the geometric shape of the mesh curve, and providing parameter basis for the subsequent generation of high-quality mesh reinforcement surfaces.

[0024] 5. The surface mesh reinforcement modeling method of the present invention, in step S262, constructs normal segments at the intersection of mesh curves, and in step S263, generates mesh reinforcement surfaces based on the mesh curves and normal segments. This ensures the geometric compatibility between the mesh reinforcement surfaces and the main surface, improves the mechanical support performance of the mesh reinforcement surfaces on the main surface, reduces the risk of structural failure due to geometric deviations during additive manufacturing, and provides an accurate geometric model basis for subsequent additive manufacturing. By efficiently and parallelly constructing the mesh reinforcement surfaces in step S264, the modeling speed and computational stability of complex irregular surface reinforcement structures are significantly improved.

[0025] 6. The curved surface mesh reinforcement modeling method of the present invention includes a step of checking the forming angle of the curved surface of the mesh reinforcement in step S300, and iteratively optimizing the mesh reinforcement model by reducing the mesh tilt angle when the forming angle requirements are not met, so that the generated irregular curved surface mesh reinforcement structure model can meet the process constraints of additive manufacturing on the forming angle, which significantly improves the modeling efficiency and processing efficiency.

[0026] 7. The surface mesh stiffening modeling method of the present invention can be clearly described as an algorithm, which is convenient for secondary development by modeling software to realize automated modeling, and greatly improves the modeling speed and structural optimization design efficiency.

[0027] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating the steps of the surface mesh reinforcement modeling method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of step S200 in an embodiment of the present invention; Figure 3 In step S251 of this embodiment of the invention, the grid curve point P is determined. n+1 A step-by-step diagram; Figure 4 This is a schematic diagram of the dimensional parameters of the main curved surface in an embodiment of the present invention; Figure 5 This is a schematic diagram of the modeling process in steps S220 and S240 of an embodiment of the present invention; Figure 6 This is one of the schematic diagrams of the modeling process in step S250 of this embodiment of the invention; Figure 7 This is a second schematic diagram of the modeling process in step S250 of this embodiment of the invention; Figure 8 This is the third schematic diagram of the modeling process in step S250 of this embodiment of the invention; Figure 9 This is one of the schematic diagrams of the modeling process in step S260 of this embodiment of the invention; Figure 10 This is a second schematic diagram of the modeling process in step S260 of this embodiment of the invention; Figure 11This is a schematic diagram showing the angle inspection results of the additive manufacturing forming of irregular curved surface mesh reinforcement with a mesh tilt angle of θ=45° according to an embodiment of the present invention. Figure 12 This is a schematic diagram showing the angle inspection results of the additive manufacturing forming of irregular curved surface mesh reinforcement with a mesh tilt angle of θ=30°, according to an embodiment of the present invention.

[0029] Figure label: 1-Main surface; 2-Mesh rib surface; L1 - Bottom curve; Ld - Top curve; P1 - Bottom mesh intersection point; P1S - Bottom mesh intersection point set; LS - Intersection set; CL - Mesh curve; F - Additive direction. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0031] Example 1 In a specific embodiment of the present invention, to address one of the problems of difficulty in controlling the forming angle of the stiffened surface and difficulty in actively optimizing the strength and stiffness of the model structure, a method for stiffening surface mesh modeling is disclosed, such as... Figure 1 As shown, it includes the following steps: S100, Establish the model of main surface 1; S200. Set the initial geometric parameters of mesh reinforcement surface 2 and establish the model of mesh reinforcement surface 2; S300. Perform simulation verification and / or optimization on the model to confirm that the mesh rib surface 22 meets the requirements of additive manufacturing forming angle.

[0032] The surface mesh reinforcement modeling method of this embodiment, by setting the initial geometric parameters of the mesh reinforcement surface 2 before establishing the mesh reinforcement surface 2 in step S200, is conducive to the active control and adjustment of the mesh tilt angle and spacing, thereby optimizing the strength and stiffness of the model structure. In step S300, through iterative checking, it is ensured that all mesh reinforcement surfaces 2 meet the additive manufacturing forming angle requirements. This effectively avoids the shortcomings of traditional surface free deformation methods, where the deformation result is determined by the mapping relationship, making it difficult to directly control the forming angle of the reinforcement surface. This significantly improves the forming success rate and structural reliability of complex irregular surface structures in the additive manufacturing process.

[0033] Furthermore, in order to address the issue that the main surface 1 is a non-rotational solid, step S100 also includes generating a non-rotational irregular surface model.

[0034] Furthermore, taking an irregular curved surface with planar curves at both ends as an example, step S100 further includes the following steps: S110. Set the edge curve of at least one end of the main surface 1 to be a planar curve; S120. Determine the height parameters of the main surface 1 and the dimension parameters of at least the two end edges; S130. Generate the model of main surface 1 based on the dimensional parameters of main surface 1.

[0035] This embodiment sets the edge curve of at least one end of the main surface 1 as a planar curve, which can determine the additive direction and provide a stable additive bottom edge, and also provide a geometric basis for the accurate arrangement of the subsequent mesh surface 2; by determining the height of the main surface 1 and the size parameters of the edge lines at both ends, the non-rotational irregular surface model can be accurately generated according to the size parameters.

[0036] Furthermore, in order to address the problem of not being able to optimize the strength and stiffness of the model structure by controlling the mesh tilt angle and mesh spacing, in step S200, the order of establishing the mesh rib surface 2 is consistent with the additive direction F. Taking the mesh intersection point P1 on the bottom curve L1 as the starting point for mesh curve modeling, the mesh curve point Pn is determined layer by layer according to the mesh tilt angle θ and mesh spacing H, thereby determining the position of the mesh curve CL on the main surface 1, and finally completing the modeling of the mesh rib surface 2.

[0037] It should be noted that the additive forming angle refers to the angle between the building direction and the model surface during the printing process, also known as the overhang angle. A forming angle greater than a threshold (generally 45°) allows for forming, while an angle less than the threshold prevents forming.

[0038] In this embodiment, in step S200, the modeling sequence of the mesh rib surface 2 is consistent with the additive direction F. Based on the mesh tilt angle θ and mesh spacing H, the mesh curve points Pn are determined layer by layer. This ensures that the mesh tilt angle θ is directly related to the additive forming angle, allowing for optimization of the additive forming angle by adjusting the mesh tilt angle θ. This avoids the process risk of an excessively small forming angle during the modeling stage, guaranteeing the manufacturability of the model from the outset. Furthermore, since the modeling sequence starts from the bottom mesh intersection point P1 on the bottom curve L1, ensuring the symmetry of the bottom mesh intersection point P1 on the bottom curve L1 automatically guarantees the symmetry of the mesh rib curve in subsequent modeling processes. For the main surface 1, which inherently possesses symmetry, the symmetry of the mesh rib surface 2 can be guaranteed.

[0039] Specifically, such as Figure 2 As shown, step S200 further includes the following steps: S210. Determine the additive manufacturing direction and the bottom edge of the main surface 1. The bottom edge curve L1 of the main surface 1 is a planar curve. S220. Construct a set of planes at equal intervals that are parallel to the bottom plane of the main surface 1, and construct the set of intersection lines LS between the plane set and the main surface 1. S230. Set the initial geometric parameters of the mesh reinforcement surface 2. The initial geometric parameters of the mesh reinforcement surface 2 include: mesh tilt angle θ, mesh spacing H and mesh reinforcement height W. S240. Set the mesh rib surface 2 to intersect at the bottom edge of the main surface 1. Determine the position of the bottom edge mesh intersection point set P1S on the bottom edge curve L1 according to the mesh spacing H. S250. Based on the grid tilt angle θ, starting from the bottom grid intersection point set P1S, determine the grid curve point set PS of each grid curve CL on each layer intersection line, connect the grid curve points of each grid curve CL on each layer intersection line, and then obtain all the grid curves CL on the main surface 1. S260. Based on the position of each mesh curve CL, construct all mesh rib surfaces 2 one by one.

[0040] Preferably, considering the problem that the generated mesh reinforcement shape is prone to errors, in S220, the plane spacing of the planes that are parallel to the bottom edge plane of the main curved surface 1 should be less than 1 / 10 of the minimum radius of curvature of the main curved surface 1, so as to reduce the error of the generated mesh reinforcement shape and make the mesh reinforcement surface 2 smoother.

[0041] In step S230 of this embodiment, the grid tilt angle θ, grid spacing H, and grid rib height W are set as modeling design parameters of the grid rib surface 2, so that they can be precisely adjusted according to actual needs. Since the grid tilt angle θ and grid spacing H directly affect the strength and stiffness of the grid-reinforced structure, the precise adjustment of these two parameters can meet the modeling requirements of structural optimization design and improve the lightweight effect of the structure.

[0042] It should be noted that, since the arc length and chord length are almost equal when the curve length is very small, the grid spacing H is calculated based on the arc length between the two intersection points for ease of plotting.

[0043] Furthermore, in step S230, the grid spacing H can be set to an equal arc length spacing, so in step S240, the position of the bottom edge grid intersection point set PS1 is determined by the equal arc length spacing method; the grid spacing W can also be set to a variable spacing according to the needs of structural optimization design.

[0044] It should be noted that if the main surface 1 and the mesh reinforcement surface need to be designed to be symmetrical about a certain plane, the set of bottom edge mesh intersection points P1S obtained in step S240 should also be symmetrical about that plane.

[0045] Furthermore, to prevent the geometric shape of the mesh-ribbed surface 2 from being discontinuous and uneven, such as... Figure 3As shown, step S250 further includes determining the grid curve point P of the grid curve CL in the (n+1)th layer. n+1 Steps: S251. Given the nth layer grid curve point P. n , through P n Construct a plane perpendicular to the intersection line of the nth layer; S252. Construct the intersection point P of this plane and the line of intersection with the (n+1)th layer. n+1 '; S253, Measurement P n and P n+1 The distance d between them; S254. Take point P on the intersection line of the (n+1)th layer. n+1 , making P n+1 and P n+1 The arc length between the two points is d×tanθ.

[0046] In step S250 of this embodiment, the grid curve point set PS is determined by iteratively layer by layer, which realizes the accurate tracking and positioning of the grid curve CL on the complex surface, ensuring the continuity and consistency of the geometric shape of the grid curve CL, and providing parameter basis for the subsequent generation of high-quality grid rib surface 2.

[0047] Furthermore, in order to solve the problem of low geometric compatibility between the mesh surface 2 and the main surface 1, S260 of this embodiment also includes the following steps: S261. Obtain the set of intersection points between grid curves CL; S262. At the intersection point, construct the normal segment of the main surface 1. The length of the normal segment is equal to the height H of the mesh reinforcement. S263. Using the Nth mesh curve and the normal segment on the Nth mesh curve as the framework of the Nth mesh reinforcement surface 2, construct the Nth mesh reinforcement surface 2; S264, N=N+1, repeat step S263 until all the mesh reinforcement surfaces 2 are created.

[0048] In step S260 of this embodiment, by constructing normal segments at the intersections of mesh curves CL in step S262, and generating mesh stiffener surface 2 using mesh curves CL and normal segments as a reference framework in step S263, the geometric compatibility between mesh stiffener surface 2 and main surface 1 is ensured. This improves the mechanical support performance of mesh stiffener surface 2 on main surface 1, reduces the risk of structural failure due to geometric deviations during additive manufacturing, and provides an accurate geometric model foundation for subsequent additive manufacturing. By constructing mesh stiffener surface 2 efficiently and in parallel in step S264, the modeling speed and computational stability of complex irregular curved stiffened structures are significantly improved.

[0049] Preferably, the height H of the mesh reinforcement is 5-20mm.

[0050] Furthermore, to address the issue that the forming angle of the mesh reinforcement surface cannot fully meet the process constraints such as the forming angle of additive manufacturing, S300 of this embodiment also includes: S300. Check the additive manufacturing forming angle of the mesh rib surface. If the check result does not meet the additive manufacturing forming requirements, reduce the mesh tilt angle θ and repeat S250 and S260 until all mesh rib surfaces meet the additive manufacturing forming requirements.

[0051] When inspecting the curved surface 2 of the mesh reinforcement, the results of the additive manufacturing forming angle of the irregular curved surface mesh reinforcement were analyzed using simulation software.

[0052] Preferably, considering that when the mesh tilt angle θ is greater than 45°, the forming angle is too large to form and the forming angle is too large to be formed, while when it is less than 30°, the circumferential strength of the mesh ribs is too weak, in step S300, the adjustment range of the mesh tilt angle θ is 30°-45°, so as to achieve the effect of balancing the forming effect and the strength of the mesh ribs.

[0053] In step S300 of this embodiment, the step of checking the forming angle of the mesh rib surface is included in the generation process of the mesh rib surface 2. If the forming angle requirement is not met, the mesh rib model is iteratively optimized by reducing the mesh tilt angle. This makes the generated irregular curved surface mesh rib structure model able to meet the process constraints of additive manufacturing on the forming angle, which significantly improves the modeling efficiency and processing efficiency.

[0054] This embodiment uses Figure 4 Taking the main curved surface 1 as an example, the specific steps of surface mesh reinforcement modeling in this embodiment are as follows: First, in S100, the edge lines at both ends of the main surface 1 are defined as the bottom curve L1 and the top curve Ld, respectively. Both curves are planar curves and lie on parallel planes. The height of the main surface 1 is 300mm. The dimensional parameters of the bottom curve L1 and the top curve Ld are as follows: Figure 2 The model of the main surface 1 is established, and step S100 is completed.

[0055] In step S210, the bottom edge of the main surface 1 is additively manufactured using the bottom curve L1 as the main curve.

[0056] like Figure 5 As shown, in step S220, a set of planes parallel to the bottom plane of the main surface 1 is constructed with a spacing of 10mm, and the intersection line set LS of the plane set and the main surface 1 is constructed.

[0057] In step S230, the initial parameters of the mesh reinforcement are set as follows: mesh tilt angle θ = ±45°; the intersection points of the bottom edge of the main curved surface 1 and the mesh are distributed at equal arc length intervals of 55mm; and the mesh reinforcement height W is 20mm.

[0058] like Figure 5 As shown, in step S240, based on the size parameters and arc length spacing of the bottom curve L1, the set of bottom edge grid intersection points P1S of the main surface 1 is obtained, which consists of 28 points.

[0059] Four of the intersection points lie within the two symmetry planes of the surface; therefore, the set of bottom mesh intersection points P1S is also symmetric about the two planes. For surfaces that are inherently symmetric, if the symmetry of the bottom mesh intersection points is guaranteed, the subsequent modeling process will automatically ensure the symmetry of the mesh reinforcement.

[0060] like Figure 6 As shown, in step S250, starting from the set of grid intersection points P1S on the bottom edge of the main surface 1, the intersection points of the grid curves on the second layer intersection line are determined. A plane perpendicular to the first layer intersection line is drawn through point P1, and the intersection point P2' of this plane and the second layer intersection line is drawn. The distance d between P1 and P2' is measured to be 10.02 mm. Point P2 is selected on the second layer intersection line, such that the arc length between P2 and P2' is d × tan45° = 5.79 mm; and so on. Figure 7 As shown, plot the intersection points of the grid curves on each layer's intersection line, and then draw spline curves through these intersection points to obtain a single grid curve. For example... Figure 8 As shown, all the mesh curves are generated using this method, thereby determining the positions of the mesh curves on the main surface 1.

[0061] like Figure 9 As shown, in step S260, the intersection set of the first mesh curve is constructed. At the intersection points, a normal segment of the main surface 1 is constructed. The length of the normal segment is the mesh reinforcement height W = 20mm. Using the first mesh curve and the normal segment as the framework of the first mesh reinforcement surface 2, the first mesh reinforcement surface 2 is constructed. This process is repeated for each subsequent step. Figure 10 As shown, construct all the mesh reinforcement surfaces 2.

[0062] In step S300, the forming angle results of the additive manufacturing of irregular curved surface mesh reinforcement are checked using simulation software.

[0063] Figure 11 When the grid is tilted at an angle of θ=45°, the result of the additive manufacturing forming angle inspection of the irregular curved surface grid is shown; the red part in the grid surface 2 in the figure is the part that does not meet the additive manufacturing forming angle requirements.

[0064] Since the structure does not meet the requirements for additive manufacturing forming angle, reduce the mesh tilt angle θ to θ=±30°, repeat steps S250 and S260, and recreate all mesh rib surfaces 2.

[0065] Figure 12The figure shows the additive manufacturing forming angle results of the irregular curved surface mesh reinforcement when the mesh tilt angle θ=30°. The results show that the mesh reinforcement surface 2 meets the additive manufacturing forming angle requirements.

[0066] The surface mesh reinforcement modeling method for additive manufacturing described in this embodiment significantly improves modeling efficiency because it is based on the geometric parameters of the main surface 1 and the mesh reinforcement, and can be implemented through programming. Since the modeling steps can be clearly described as algorithms, automated modeling can be achieved through secondary development of modeling software, greatly improving modeling speed and structural optimization design efficiency.

[0067] Example 2 This embodiment provides a surface mesh reinforcement modeling system, which generates a surface mesh reinforcement model using the surface mesh reinforcement modeling method described in Embodiment 1. The surface mesh reinforcement modeling system includes a parameter input unit, a modeling calculation and model generation unit, and a simulation verification unit.

[0068] The parameter input unit in this embodiment is used to receive the design parameters of the main surface 1 and the mesh reinforcement surface 2, specifically including the control point coordinates and boundary curve equation of the main surface 1, and the mesh tilt angle θ, mesh spacing H, and mesh reinforcement height W of the mesh reinforcement surface 2.

[0069] The modeling calculation and model generation unit in this embodiment is used to generate mesh curves and mesh reinforcement surfaces 2, and to transfer the generated surface mesh reinforcement model data to the simulation verification unit. Specifically, the modeling calculation and model generation unit constructs the main surface 1 according to the input parameters, generates the intersection points of the mesh curves at preset intervals, and extends them along the normal direction to form the mesh reinforcement surface 2. It also monitors in real time whether the geometric characteristics of the mesh reinforcement meet the preset forming angle threshold. If the forming angle of a local area exceeds the threshold, the parameter correction mechanism is automatically triggered to regenerate the mesh reinforcement surface 2 that meets the requirements, and the corrected surface mesh reinforcement model data is transferred to the simulation verification unit again.

[0070] The simulation verification unit in this embodiment is used to perform additive manufacturing forming angle simulation verification on the generated mesh rib surface 2, and output the areas that do not meet the requirements to the modeling calculation and model generation unit to adjust the parameters.

[0071] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for modeling reinforced curved surface meshes, characterized in that, Includes the following steps: S100, Establish the model of the main surface; S200. Set the initial geometric parameters of the mesh reinforcement and establish the model of the mesh reinforcement surface; S300. Perform simulation verification and / or optimization on the model to confirm that the mesh rib surfaces all meet the requirements of additive manufacturing forming angles.

2. The surface mesh reinforcement modeling method according to claim 1, characterized in that, Step S100 also includes: generating a non-rotational irregular surface.

3. The surface mesh reinforcement modeling method according to claim 2, characterized in that, Step S100 also includes the following steps: S110. Set the edge curve of at least one end of the main surface to a planar curve; S120. Determine the height parameters of the main surface and the dimension parameters of at least the two end edges; S130. Generate the model of the main surface based on the dimensional parameters of the main surface.

4. The surface mesh reinforcement modeling method according to claim 3, characterized in that, S200 further includes: determining the additive manufacturing direction F and the bottom edge of the main surface, wherein the bottom edge curve L1 of the main surface is a planar curve.

5. The surface mesh reinforcement modeling method according to claim 2, characterized in that, The initial geometric parameters in step S200 include: mesh tilt angle θ, mesh spacing H, and mesh rib height W.

6. The surface mesh reinforcement modeling method according to claim 5, characterized in that, S200 also includes: generating the mesh curve CL on the main surface.

7. The surface mesh reinforcement modeling method according to claim 6, characterized in that, S200 also includes: constructing the normal segment of the main surface at the intersection of each grid curve CL.

8. The surface mesh reinforcement modeling method according to claim 7, characterized in that, The length of the normal segment is equal to the height W of the mesh reinforcement.

9. The surface mesh reinforcement modeling method according to claim 8, characterized in that, S200 also includes: a framework for each mesh reinforcement surface, with each mesh curve CL and normal segment as the mesh reinforcement surface, and each mesh reinforcement surface is constructed.

10. A surface mesh reinforcement modeling system, characterized in that, A surface mesh stiffening model is generated using the surface mesh stiffening modeling method according to any one of claims 1 to 9.

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