Standard roller mesh generation method and system based on finite element analysis

Abstract

The invention relates to the technical field of finite element analysis, and particularly discloses a standard roller mesh generation method and system based on finite element analysis, and the method comprises the steps: constructing a three-dimensional model of a standard roller, and segmenting the three-dimensional model of the standard roller into a roller thread entity, a roller gear entity and a roller shaft entity according to the structure; meshing is conducted on the roller gear entity, meshing is conducted on the roller thread entity, meshing is conducted on the roller shaft entity, and meshing is conducted on the roller shaft entity through a 2D two-in-one transition mesh; and generating a standard roller hexahedral mesh. The 2D two-in-one transition grids are adopted for the roller shaft entity tangent plane, the calculation efficiency can be greatly improved on the premise that the calculation precision is not obviously influenced, the number of the grids of the model is effectively reduced while it is guaranteed that key mechanical information is captured, the freedom degree of the model is reduced, and calculation resources and time are obviously saved.

Description

Technical Field

[0001] The present invention relates to the technical field of finite element analysis, and in particular to a standard roller meshing method and system based on finite element analysis. Background Art

[0002] Finite element analysis of pre-designed mechanical transmission structures is a common method in the engineering field. Most of the meshing methods for planetary roller screw pairs are also automatically generated by finite element analysis software. Due to the complex surface features of this type of model, the meshing methods used are mostly dominated by tetrahedrons, resulting in a large number of meshes, and are mostly dominated by first-order tetrahedral meshes. The result accuracy is relatively poor compared to hexahedral meshes, and high-order units need to be used, but the use of high-order units will result in a larger amount of calculations. Hexahedral mesh calculations are easier to converge than tetrahedral calculations; the mesh direction of hexahedral meshes can better cater to the boundary layer of the flow field direction, and the discrete error of hexahedral meshes is smaller than that of tetrahedral meshes. Summary of the invention

[0003] The object of the present invention is to provide a method and system for meshing a standard roller based on finite element analysis to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a meshing method for a standard roller based on finite element analysis, the method comprising: Construct a three-dimensional model of a standard roller; The three-dimensional model of the standard roller is divided into roller thread entity, roller gear entity and roller shaft entity according to the structure; Mesh the roller gear entity and generate a 3D hexahedral mesh diagram of the roller gear entity; Meshing the roller thread entity to generate a 3D hexahedral mesh map of the roller thread entity; Meshing the roller shaft entity to generate a 3D hexahedral mesh map of the roller shaft entity, wherein the roller shaft entity is meshed using a 2D two-in-one transition mesh; The 3D hexahedral mesh images of the generated roller thread entity, roller gear entity and roller shaft entity are merged to generate a standard roller hexahedral mesh.

[0005] As a further solution of the present invention, the step of dividing the three-dimensional model of the standard roller into a roller thread entity, a roller gear entity and a roller shaft entity according to the structure specifically includes: Make a base circle for the axial section of the three-dimensional model of the standard roller; The three-dimensional model of the standard roller is divided in the axial direction according to the base circle.

[0006] As a further solution of the present invention, the step of meshing the roller gear entity to generate a 3D hexahedral mesh map of the roller gear entity specifically includes: Divide the side surface of the roller gear entity into several tooth surfaces; Create a reference line on a single tooth surface, and pre-divide the single tooth surface based on the reference line; Create a 2D mesh for the pre-divided single tooth surface and generate a 2D mesh map of the single tooth surface; Generate a 2D mesh image of a roller gear entity based on a 2D mesh image of a single tooth surface; Generate a 3D hexahedral mesh of the roller gear entity based on the 2D mesh of the roller gear entity.

[0007] As a further solution of the present invention, the principle of creating the 2D mesh map of the single tooth surface is that the mesh of the gear teeth is encrypted and the mesh of the gear root is sparse.

[0008] As a further solution of the present invention, the step of meshing the roller thread entity to generate a 3D hexahedral mesh map of the roller thread entity specifically includes: Get a single thread section of a roller thread entity; Perform 2D meshing based on a single thread section to generate a 2D mesh diagram of a single thread section; The 2D mesh image of a single thread section is copied and phase-transformed to generate a 2D mesh image of a section of a circle of threads; Generate a single slice 3D mesh graph using node mapping for the 2D mesh graphs of two adjacent slices; Merge all the generated 3D mesh images of the cross-sections to generate a 3D hexahedral mesh of a circle of threads; The 3D hexahedral mesh of one circle of thread is copied and merged to generate a 3D hexahedral mesh of the roller thread entity.

[0009] As a further solution of the present invention, the mesh size of the thread root area in the 2D mesh diagram of a single thread section is smaller than that of the thread crest area.

[0010] As a further solution of the present invention, the step of meshing the roller shaft entity to generate a 3D hexahedral mesh diagram of the roller shaft entity specifically includes: Get a single slice of the roller shaft entity; Mesh a single section of the roller shaft entity to generate a 2D mesh image of the roller shaft section; Generate a 3D hexahedral mesh of the roller bearing entity based on the 2D mesh of the slice.

[0011] The present invention also provides a mesh generation system for a standard roller based on finite element analysis, which is used to implement a mesh generation method for a standard roller based on finite element analysis. The system comprises: A model building module, used to build a three-dimensional model of a standard roller; A segmentation module, used to segment the three-dimensional model of the standard roller into roller thread entities, roller gear entities and roller shaft entities according to the structure; Gear meshing module, used to mesh the roller gear entity and generate a 3D hexahedral mesh map of the roller gear entity; The thread meshing module is used to mesh the roller thread entity and generate a 3D hexahedral mesh map of the roller thread entity; A shaft meshing module, used for meshing the roller shaft entity and generating a 3D hexahedral mesh map of the roller shaft entity, wherein the roller shaft entity is meshed using a 2D two-in-one transition mesh; The synthesis module is used to merge the 3D hexahedral mesh images of the generated roller thread entity, roller gear entity and roller shaft entity to generate a standard roller hexahedral mesh.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: by adopting a 2D two-in-one transition grid for the solid section of the roller shaft, the calculation efficiency can be greatly improved without significantly affecting the calculation accuracy. While ensuring the capture of key mechanical information, the number of meshes in the model is effectively reduced, the degree of freedom of the model is reduced, and computing resources and time are significantly saved. The unnecessary computational burden and numerical complexity caused by overly dense grids in non-critical areas are avoided. At the same time, hexahedral grid division of the entire model is performed to improve the grid quality. In summary, the present invention can improve the grid quality of the grid divided by the rollers of the improved standard planetary roller screw pair, improve the simulation accuracy and efficiency, and can be extended to the hexahedral grid division of any complex structure with arbitrary characteristics to improve the efficiency of finite element calculations. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0014] Figure 1 A flowchart of a method for meshing a standard roller based on finite element analysis provided in an embodiment of the present invention.

[0015] Figure 2 A three-dimensional model diagram of the improved planetary roller screw pair structure provided in an embodiment of the present invention.

[0016] Figure 3A three-dimensional model diagram of the improved planetary roller screw pair rollers provided in an embodiment of the present invention.

[0017] Figure 4 A side single tooth surface feature cut diagram of a roller gear entity provided in an embodiment of the present invention.

[0018] Figure 5 A 2D mesh division diagram of a single tooth surface on the side of a roller gear entity provided in an embodiment of the present invention.

[0019] Figure 6 A side 2D mesh division diagram of a roller gear entity provided in an embodiment of the present invention.

[0020] Figure 7 A 3D hexahedral mesh division diagram of a roller gear entity provided in an embodiment of the present invention.

[0021] Figure 8 A schematic diagram of a standard external thread cross-section profile provided in an embodiment of the present invention.

[0022] Fig. 9 A 2D mesh division diagram of a cross section of a roller thread entity provided in an embodiment of the present invention.

[0023] Fig.10 A 2D mesh division diagram of a thread section of a roller thread entity provided in an embodiment of the present invention.

[0024] Fig.11 A 3D hexahedral mesh division diagram of a circle of thread of a roller thread entity provided in an embodiment of the present invention.

[0025] Fig.12 A 3D hexahedral mesh division diagram of a roller thread entity provided in an embodiment of the present invention.

[0026] Fig.13 A 2D two-in-one transition mesh diagram of a roller shaft entity provided in an embodiment of the present invention.

[0027] Fig.14 A 3D hexahedral mesh diagram of the outer ring portion of the roller shaft provided in an embodiment of the present invention.

[0028] Fig.15 A 3D hexahedral mesh diagram of the solid part of the roller shaft provided in an embodiment of the present invention.

[0029] Fig.16 Finite element mesh diagram of the improved planetary roller screw pair rollers provided in an embodiment of the present invention.

[0030] Fig.17 A diagram of the rigid-flexible coupling ISPRSM model provided in an embodiment of the present invention.

[0031] Fig.18A schematic structural diagram of a standard roller meshing system based on finite element analysis provided in an embodiment of the present invention.

[0032] In the figure: 1. Roller gear entity 1; 2. Roller thread entity; 3. Roller shaft entity. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] Figure 1 is a flow chart of a method for meshing a standard roller based on finite element analysis. In an embodiment of the present invention, a method for meshing a standard roller based on finite element analysis includes: Step S100, constructing a three-dimensional model of a standard roller; Step S200, dividing the three-dimensional model of the standard roller into a roller thread entity 2, a roller gear entity 1 and a roller shaft entity 3 according to the structure; Step S300, meshing the roller gear entity 1 to generate a 3D hexahedral mesh diagram of the roller gear entity 1; Step S400, meshing the roller thread entity 2 to generate a 3D hexahedral mesh map of the roller thread entity 2; Step S500, meshing the roller shaft entity 3 to generate a 3D hexahedral mesh map of the roller shaft entity 3, wherein the roller shaft entity 3 is meshed using a 2D two-in-one transition mesh; Step S600, merging the generated 3D hexahedral mesh images of the roller thread entity 2, the roller gear entity 1 and the roller shaft entity 3 to generate a standard roller hexahedral mesh.

[0035] In this embodiment, in order to reduce the number of meshes in the part that has little influence on the finite element analysis result as much as possible, the section of the roller shaft entity 3 adopts a 2D two-in-one transition mesh.

[0036] For the meshes in non-threaded areas, in view of their relatively minor position in mechanical properties and the uniformity of stress distribution, appropriately increasing the mesh size can greatly improve the calculation efficiency without significantly affecting the calculation accuracy. While ensuring the capture of key mechanical information, it effectively reduces the number of meshes in the model, reduces the degree of freedom of the model, significantly saves computing resources and time, and avoids unnecessary computing burden and numerical complexity caused by over-dense meshes in non-critical areas. The present invention can greatly improve the mesh quality of planetary roller screw pairs, improve simulation accuracy and efficiency, and can be extended to other structures with complex surface features.

[0037] In one embodiment, the step of dividing the three-dimensional model of the standard roller into a roller thread entity 2, a roller gear entity 1 and a roller shaft entity 3 according to the structure specifically includes: Make a base circle for the axial section of the three-dimensional model of the standard roller; The three-dimensional model of the standard roller is divided in the axial direction according to the base circle.

[0038] In this embodiment, the roller of the improved standard planetary roller screw pair is structured and divided, a circle is made on the axial end face of the roller, and the structure is divided along the axial direction through the created circle. The roller is divided into a roller thread entity 2, a roller gear entity 1 and a roller shaft entity 3.

[0039] See also Figures 4 to 7 In one embodiment, the step of meshing the roller gear entity 1 specifically includes: Divide the side surface of the roller gear entity 1 into a plurality of tooth surfaces; Create a reference line on a single tooth surface, and pre-divide the single tooth surface based on the reference line; Create a 2D mesh for the pre-divided single tooth surface to generate a 2D mesh map of the single tooth surface. The principle of creating the 2D mesh map of the single tooth surface is that the mesh of the gear teeth is encrypted and the mesh of the gear root is sparse. Generate a 2D mesh image of a roller gear entity 1 based on the 2D mesh image of a single tooth surface; A 3D hexahedral mesh image of the roller gear entity 1 is generated based on the 2D mesh image of the roller gear entity 1 .

[0040] In this embodiment, the lines in the Geom function area create a reference line on the side of the roller gear entity 1, the side of the roller gear entity 1 is pre-divided, and the surface mesh of the side of the roller gear entity 1 is constrained. Figure 4 shown.

[0041] In the 2D function area, Automesh creates a 2D mesh for the side of the roller gear entity 1 after the single tooth is cut, and the mesh of the gear teeth is encrypted. The mesh of the gear root is appropriately sparse, and a transition mesh is used between the gear teeth and the gear root. The generated 2D mesh is as follows: Figure 5 shown.

[0042] Use the transformation tools function to copy the 2D mesh of a single tooth of the generated roller gear entity 1 to generate a 2D mesh on the side of the roller gear entity 1. The generated 2D mesh is as follows: Figure 6 shown.

[0043] In the Solidmap of the 3D function area, sweep the 2D mesh extension line of the roller gear entity 1 to generate a 3D hexahedral mesh of the roller gear entity 1. The generated 3D hexahedral mesh is as follows: Figure 7 shown.

[0044] See also Figures 8 to 12 In one embodiment, the step of meshing the roller thread entity 2 specifically includes: Get a single thread section of the roller thread entity 2; Perform 2D meshing based on a single thread section to generate a 2D mesh diagram of a single thread section; The 2D mesh image of a single thread section is copied and phase-transformed to generate a 2D mesh image of a section of a circle of threads; Generate a single slice 3D mesh graph using node mapping for the 2D mesh graphs of two adjacent slices; Merge all the generated 3D mesh images of the cross-sections to generate a 3D hexahedral mesh of a circle of threads; The 3D hexahedral mesh of one circle of thread is copied and merged to generate the 3D hexahedral mesh of roller thread entity 2.

[0045] In this embodiment, since the roller thread segment of the planetary roller screw pair is similar to the standard thread, the mathematical expression of its helix is ​​as follows: ; like Figure 8 As shown, assuming a pitch P The height of the circumferential coordinates It grows linearly from 0 to , it can be deduced that the standard specification of the internal thread section and The expression of is as follows: ; The specific operation is as follows: each thread section has the same cross-sectional features and the same phase difference. Therefore, a thread section of the roller thread is divided into 2D meshes, and other sections are copied and phase-changed accordingly. The thread section 2D mesh is as follows: Fig. 9 The generated thread section 2D mesh is copied and phase-changed accordingly to obtain a circle of thread section 2D mesh. Fig.10 shown.

[0046] In the Solidmap of the 3D function area, use node mapping to generate 3D meshes for the 2D meshes of two adjacent sections. Use the face tool to merge all the generated 3D meshes. After merging, the 3D hexahedral mesh of a circle of threads is as follows: Fig.11 shown.

[0047] Use the transformation tools function to copy the 3D hexahedral mesh of the generated thread circle, and use the face tool to merge all the generated 3D meshes to generate the 3D hexahedral mesh of the roller thread entity 2 as shown below: Fig.12 shown.

[0048] In one embodiment, the mesh size of the thread root region in the single thread section 2D mesh image is smaller than that of the thread crest region.

[0049] In this embodiment, the thread root area is one of the key parts that affect the mechanical properties of the entire roller because of the significant stress concentration phenomenon. Therefore, quadrilateral mesh units with smaller mesh sizes are set at the root to accurately capture the stress change gradient. They are closely arranged and fit the root curve contour, which can effectively reflect the complex stress-strain state of the root; at the thread top, a relatively fine mesh is required because it is also subjected to greater contact stress and friction.

[0050] Structures with thread features have complex geometric shapes, and stress concentration will occur at the thread root, crest and other parts during operation. The present invention fully considers the geometric characteristics of these threads when dividing the mesh, and can reasonably construct the plane mesh shape of the end face at the thread segment cutting point according to the mesh density, and refine the mesh at key parts such as the thread root and crest to accurately capture the stress change gradient, and can more accurately capture the mechanical behavior of the stress concentration area.

[0051] As for the meshes in non-threaded areas, the mesh size is appropriately increased in view of the relatively uniform stress distribution. This meshing method not only ensures the calculation accuracy of key parts, but also reduces the number of meshes in non-key areas, thereby reducing the degree of freedom of the model and the amount of calculation, thereby improving the efficiency of finite element related calculations.

[0052] The reason for the above advantages is that the time of finite element calculation is mainly limited by the number of degrees of freedom of the model. Studies have shown that under the same mesh size, the calculation accuracy of the second-order tetrahedral mesh and the first-order hexahedral unit is the same. The ratio of the number of nodes to the number of meshes of the first-order hexahedral mesh is approximately 1:1, and each node has 6 degrees of freedom, while the ratio of the number of nodes to the number of meshes of the second-order tetrahedral unit is approximately 10:1, and each node has 3 degrees of freedom. And the use of two-in-one transition meshes can further reduce the number of meshes. In the process of meshing the rollers of the planetary roller screw pair, the end face of the effective thread segment is constructed with an accurate mesh shape according to its structural characteristics (the mapping meshing technology is used according to the thread parameters to ensure smooth transition and a small mesh size is reasonably set at key locations such as the thread root and the crest), the method of adaptively increasing the mesh size is used for non-threaded parts, and the two-in-one transition mesh is used to integrate the mesh of some areas, so that when the hexahedral unit is used for meshing, it has the effect of including fewer degrees of freedom, reducing hardware requirements and saving calculation time.

[0053] See also Figures 13 to 15 In one embodiment, the step of meshing the roller shaft entity 3 and generating a 3D hexahedral mesh map of the roller shaft entity 3 specifically includes: Get a single slice of the roller shaft entity 3; Meshing a single section of the roller shaft entity 3 to generate a 2D mesh image of the roller shaft section; A 3D hexahedral mesh of the roller shaft entity 3 is generated based on the 2D mesh of the cross section.

[0054] Use the spin function in the 3D function area to create a 3D mesh from the above 2D two-in-one transition mesh. The generated 3D hexahedral mesh of the outer ring of the roller shaft entity 3 is as follows: Fig.14 The same method is used to process the inner ring of the roller shaft entity 3 to generate the hexahedral mesh of the roller shaft entity 3 as shown in Fig.15 shown.

[0055] In the planetary roller screw system, there is complex relative motion and force transmission between the screw, nut, and roller, so it is necessary to accurately describe the rigid-flexible coupling relationship between these components. For some components with strong structures, small deformations, and negligible effects on the overall performance of the system, they are regarded as rigid bodies; and for components such as screws and rollers that will produce obvious elastic deformations during work and such deformations have an important impact on the performance of the system, they are regarded as flexible bodies. The rigid-flexible coupling model can accurately simulate the deformation of such flexible components and the interaction and coupling relationship with other rigid components. The rigid-flexible coupling model has a verification and guidance role in mesh division and can ensure the quality of the mesh. When meshing, the key areas can be locally encrypted to improve the calculation accuracy of the area, while the mesh size can be appropriately increased in non-critical areas to reduce the amount of calculation and model freedom while ensuring the calculation accuracy. Considering the structural composition of the entire mechanical system and the motion relationship between the components, a rigid-flexible coupling ISPRSM model is established, such as Fig.17 shown.

[0056] like Fig.18 As shown, an embodiment of the present invention further provides a meshing system for a standard roller based on finite element analysis, the system comprising: A model building module 100, for building a three-dimensional model of a standard roller; A segmentation module 200, used for segmenting the three-dimensional model of the standard roller into a roller thread entity 2, a roller gear entity 1 and a roller shaft entity 3 according to the structure; The gear meshing module 300 is used to mesh the roller gear entity 1 and generate a 3D hexahedral mesh diagram of the roller gear entity 1; The thread meshing module 400 is used to mesh the roller thread entity 2 and generate a 3D hexahedral mesh map of the roller thread entity 2; A shaft meshing module 500 is used to mesh the roller shaft entity 3 and generate a 3D hexahedral mesh diagram of the roller shaft entity 3. The roller shaft entity 3 is meshed using a 2D two-in-one transition mesh; The synthesis module 600 is used to merge the generated 3D hexahedral mesh images of the roller thread entity 2, the roller gear entity 1 and the roller shaft entity 3 to generate a standard roller hexahedral mesh.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A meshing method for a standard roller based on finite element analysis, characterized in that: The method comprises: Construct a three-dimensional model of a standard roller; The three-dimensional model of the standard roller is divided into roller thread entity, roller gear entity and roller shaft entity according to the structure; Mesh the roller gear entity and generate a 3D hexahedral mesh diagram of the roller gear entity; Meshing the roller thread entity to generate a 3D hexahedral mesh map of the roller thread entity; Meshing the roller shaft entity to generate a 3D hexahedral mesh map of the roller shaft entity, wherein the roller shaft entity is meshed using a 2D two-in-one transition mesh; The 3D hexahedral mesh images of the generated roller thread entity, roller gear entity and roller shaft entity are merged to generate a standard roller hexahedral mesh.

2. The meshing method of a standard roller based on finite element analysis according to claim 1 is characterized in that: The step of dividing the three-dimensional model of the standard roller into a roller thread entity, a roller gear entity and a roller shaft entity according to the structure specifically includes: Make a base circle for the axial section of the three-dimensional model of the standard roller; The three-dimensional model of the standard roller is divided in the axial direction according to the base circle.

3. The meshing method of a standard roller based on finite element analysis according to claim 1 is characterized in that: The step of meshing the roller gear entity to generate a 3D hexahedral mesh map of the roller gear entity specifically includes: Divide the side surface of the roller gear entity into several tooth surfaces; Create a reference line on a single tooth surface, and pre-divide the single tooth surface based on the reference line; Create a 2D mesh for the pre-divided single tooth surface and generate a 2D mesh map of the single tooth surface; Generate a 2D mesh image of a roller gear entity based on a 2D mesh image of a single tooth surface; Generate a 3D hexahedral mesh of the roller gear entity based on the 2D mesh of the roller gear entity.

4. The meshing method of a standard roller based on finite element analysis according to claim 3 is characterized in that: The principle for creating the 2D mesh map of a single tooth surface is that the mesh of the gear teeth is encrypted and the mesh of the gear root is sparse.

5. The meshing method of a standard roller based on finite element analysis according to claim 1 is characterized in that: The step of meshing the roller thread entity to generate a 3D hexahedral mesh map of the roller thread entity specifically includes: Get a single thread section of a roller thread entity; Perform 2D meshing based on a single thread section to generate a 2D mesh diagram of a single thread section; The 2D mesh image of a single thread section is copied and phase-transformed to generate a 2D mesh image of a section of a circle of threads; Generate a single slice 3D mesh graph using node mapping for the 2D mesh graphs of two adjacent slices; Merge all the generated 3D mesh images of the cross-sections to generate a 3D hexahedral mesh of a circle of threads; The 3D hexahedral mesh of one circle of thread is copied and merged to generate a 3D hexahedral mesh of the roller thread entity.

6. The meshing method of a standard roller based on finite element analysis according to claim 5, characterized in that: In the 2D mesh image of a single thread section, the mesh size of the thread root area is smaller than that of the thread crest area.

7. The meshing method of a standard roller based on finite element analysis according to claim 1 is characterized in that: The step of meshing the roller shaft entity to generate a 3D hexahedral mesh diagram of the roller shaft entity specifically includes: Get a single slice of the roller shaft entity; Mesh a single section of the roller shaft entity to generate a 2D mesh image of the roller shaft section; Generate a 3D hexahedral mesh of the roller bearing entity based on the 2D mesh of the slice.

8. A mesh generation system for a standard roller based on finite element analysis, used to implement the mesh generation method for a standard roller based on finite element analysis according to any one of claims 1 to 7, characterized in that: The system comprises: A model building module, used to build a three-dimensional model of a standard roller; A segmentation module, used to segment the three-dimensional model of the standard roller into roller thread entities, roller gear entities and roller shaft entities according to the structure; Gear meshing module, used to mesh the roller gear entity and generate a 3D hexahedral mesh map of the roller gear entity; The thread meshing module is used to mesh the roller thread entity and generate a 3D hexahedral mesh map of the roller thread entity; A shaft meshing module, used for meshing the roller shaft entity and generating a 3D hexahedral mesh map of the roller shaft entity, wherein the roller shaft entity is meshed using a 2D two-in-one transition mesh; The synthesis module is used to merge the 3D hexahedral mesh images of the generated roller thread entity, roller gear entity and roller shaft entity to generate a standard roller hexahedral mesh.

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