The concept of parametric method parameterization technology revolves around the original and modified graphic structures. This system employs offline parameterization, which differs from online parameterization by not requiring real-time user input. Instead, it relies on predefined constraints established through auxiliary lines. The system allows users to freely map elements, while internally recognizing both dimensional and geometric topological constraints—explicit or implicit. By using auxiliary lines as a central reference, the system identifies relationships between graphic entities (like lines and circles) and size entities. When dimensions are adjusted, the associated auxiliary lines update accordingly, propagating changes to connected elements. This approach ensures that all components remain consistent with the design.
Offline parameterization is chosen for several reasons. Auxiliary lines are commonly used in engineering drawings to locate key points. They are simple yet essential, often consisting of basic elements like points, lines, and circles. These lines do not form standalone parts but serve as guides for geometric constraints. Their clarity and reliability make them ideal for expressing relationships. Lines and circles in auxiliary lines have strong geometric invariance, making their creation and intersection processing straightforward. Directionality can also be incorporated, which is crucial for fully capturing constraints. Additionally, auxiliary lines are closely tied to dimensioning, allowing efficient integration of manual guide lines from dimension marks to define and identify drawing elements.
In the field of CAD parametric design, the idea of parameterization can be applied through auxiliary lines. Each step in the drawing process follows a determined sequence, with each auxiliary line depending on at most one variable, ensuring a local and efficient algorithm. From an engineering perspective, drawing elements are typically categorized into known and unknown elements, with sizes similarly divided. Following a strict manual drawing order ensures that the drawing process is systematic: starting with a benchmark, then drawing known elements based on known sizes. Unknown elements are gradually converted into known ones, enabling the construction of the entire drawing step by step. This structured approach is essential for computer analysis.
The system uses an interactive database approach, where standard part graphics are defined through interactive methods. A database is built that links standard parts' graphics with their corresponding data. These graphics must be parameterized, and managing the parameterized library is closely integrated with the overall system. We have developed systems for mechanical and standard parts, such as couplings (bolts, nuts), support components (bearings), and structural members (springs).
Two critical technologies in the parametric system involve inserting parameter subgraphs into the main graph. This process ensures that existing parameter features remain unaffected by the original image while still being driven by size changes. The driver parameter diagram supports the assumption that parameter files can drive the parameter map. The development of a standard component parameterization database includes basic data stored in a specific format, along with a gallery of parametric prototype maps. Methods for retrieving both standard data and graphics are also established, enhancing the system's flexibility and usability.
Complex CNC Machined Components
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