Feature Modeling System institutions 2 feature modeling system and implementation <br> <br> proposed, comprehensive application-oriented features of the design and manufacturing feature recognition technology. The feature recognition technology in the system can make full use of existing resources, and adopt the combination of interactive feature recognition method and rule-based automatic feature recognition method to extract feature information and input tolerances from existing 3D solid modeling system. The information together form a feature-based information model and is stored in the STEP file. Manufacturing-oriented feature design enables simultaneous product design and process design, captures high-level descriptions of design and manufacturing intents other than part geometry at the design stage, and ultimately forms part feature models, and passes feature verification and re- Organize and save it in the STEP file. Using AutoCAD13 as the supporting environment for part feature modeling, the 3D solid model of the part was constructed, and the system structure of feature modeling was developed twice by Visual C++.
(1) The feature definition module mainly defines the size and reference information of the user feature, and generates a user-defined feature library.
(2) The feature operation and operation module mainly completes various flat and Boolean operations of features, and performs consistency check on the topology and attributes of the features.
(3) The characteristic information setting module mainly sets information such as dimensional tolerance, roughness, geometric precision of the feature, and can add feature information such as function, material, hardness, heat treatment, designer, design time, and the like to the feature.
(4) User-defined feature library module is mainly based on the user's classification of parts, analyzing the characteristics of each type of parts, and thus extracting a set of features, which constitutes the feature library of the part family.
(5) The feature design module is mainly based on the user-defined feature library for feature design.
(6) The feature processing module mainly verifies, replaces, and modifies the part feature model, and regenerates the part feature model.
(7) The feature recognition module can identify the overall information of the part, the information of each feature, the size, the geometric tolerance, the roughness, etc., and provide rich source information for the subsequent process of CAD.
(8) STEP file module uses STEP to convert various geometric modes into a unified data expression mode to realize CAD/CAPP integration.
In the characteristic modeling system of the rear axle bevel gear of the automobile, by analyzing the design requirements, determining the part base, shape feature, loading positioning scheme, feature processing approach, analyzing the part processing method, and constructing the part by using the solid modeling module of Auto CAD13 Various design features, and add and subtract features to the basic shape, and expand the design process. When adding and subtracting features, first select the shape feature from the feature library, specify the shape size and tolerance of the feature; then specify the positioning reference and positioning size and tolerance of the feature; finally perform Boolean operations and operations to generate the part feature model. The user can select the required design features and input relevant feature data through the input interface (drop-down menu or dialog box) of the system, and the system can interactively perform feature editing operations such as size modification and reference transformation according to user requirements. For example, the user needs to modify the pitch angle δ of the bevel gear, just select the edit menu. At this time, the system pops the value of the taper angle δ and re-enters the δ value. The system automatically recognizes the feature type based on the modified δ value. Drive the relevant application, and modify the size (pitch diameter df, pitch cone length Lf, etc.) related to the pitch angle δ, and generate a new conical gear model according to the modified content. The feature editing and modification process adopts automatic feature recognition method, in which simple features (such as stepped axes, chamfers, keyways, etc.) are extracted by rule-based automatic feature recognition, while complex features (arc tooth thickness, pitch cone angle) Etc.) Extracted using human-computer interactive feature recognition.
3 Conclusion
In this paper, the basic form of feature modeling technology is deeply analyzed, and the system structure and implementation method of feature modeling are proposed. The system is applied to the parallel design of the rear axle bevel gear of the automobile and has achieved satisfactory results.
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