A benchmark fusion method for clipping and pasting primitive structures
A fusion method and technology of primitives, applied in instruments, geometric CAD, calculation, etc., can solve the problems that the structure cannot be driven by parameters, it is difficult to meet the requirements of high-efficiency variable topology design of the structure, and the fusion of different structures cannot be performed.
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Embodiment 1
[0050] Example 1: Clipping and pasting of primitive structures
[0051] Such as figure 2 As shown in FIG. 2 , it is a schematic clipping diagram of the existing graphic element structure of the present invention. For n-polygon primitives, the reference set S required to form a complete constraint is a subset of the primitive element set G The target primitive clipping is performed on the parametric constrained n-polygon model, respectively on the edge P 1 P n and side P 1 P 2 Clipping is performed on , and g (g=3) points are obtained. During the clipping operation, the constraints associated with the clipped points will be released. Constraint release can be interpreted as deleting the original constraint and making it a free state. After the clipping is completed, two independent parameterized constraint model structures of the target primitive structure and the remaining primitive structure are formed. figure 2 (a) is an n-gon primitive, if its vertices form the da...
Embodiment 2
[0072] Example 2: Construction of primitive bridge
[0073] Such as Figure 4 As shown, it is a schematic diagram of constructing a primitive bridge between the clipping primitive structure and the accepting primitive structure of the present invention. Such as Figure 4 As shown in (a), the boundary curves on the bridging surface of the acceptor primitive structure primitive and the bridging surface of the clipping primitive structure primitive are respectively C 1 and C 2 , O 1 for curve C 1 The center of the enclosed area surrounded by O 2 for O 1 on the surface Ω 2 Orthographic projection on , through the normal O 1 o 2 The normal plane and boundary curve C of 1 、C 2 The intersection point is denoted as C 1( α), C 2 (α), where α is the declination angle between the normal plane position and the initial position, α∈[0,2π).
[0074] Such as Figure 4 (b), with V 1 , V 2 Identify the boundary curve C 1 、C 2 Node pairs on , namely: V 1 =C 1 (α), V 2 =C 2...
Embodiment 3
[0087] Example 3: Screw parts
[0088] Such as Figure 6 Shown is the application of the method of the present invention in the structural transplantation of injection molding screw parts. Figure 6 (a) is the structural representation of the screw rod A parts before the shearing operation of the present invention, Figure 6 (b) is a structural schematic diagram of the parts of the screw B before the shearing operation of the present invention.
[0089] Figure 6 (a) There are 17 parameter constraint dimensions, which are L1~L8, d1~d7, helix height H1, and pitch P1. The axial dimension reference is the right end face, and the radial dimension reference is the horizontal centerline;
[0090] Figure 6 (b) There are 18 parameter constraint dimensions, which are L21~L29, d21~d27, helix height H2, and pitch P2. The axial dimension reference is the right end face, and the radial dimension reference is the horizontal centerline.
[0091] Figure 6 Where L represents the length...
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