In order to efficiently retrieve standard components from a large library, it's essential to organize them using a structured hierarchy. The standard parts are categorized into two levels: the top level is based on international standards such as ANSI Inch, ANSI Metric, DIN, CB, ISO, JIS, and others. At the lower level, these are further grouped by their function—such as bolts and screws, nuts, pins, springs, washers, and more. This organized structure significantly improves the ability to search for and reuse standard components quickly and accurately.
The reuse of standard parts goes beyond just geometric models; it also involves various types of information. First, there is the geometric data, which includes the specific features and parameters of each standard part. When reusing a component, its dimensions drive the corresponding template, making feature-based parametric modeling an effective approach for creating and managing standard parts in 3D CAD systems. Second, assembly information plays a key role. This includes both the geometric constraints between parts and the assembly features required during the design process, such as axes or points that serve as references. Finally, there’s a range of associated data, including relationships with schematic diagrams, dominant parameters, hole geometry, hole parameters, expressions, and assembly features. All of this information is stored in an XML file, and during the design process, the template is instantiated into a current design instance. This process ensures consistency, efficiency, and ease of use when working with standard components.
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