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Part feature information modelling approach

A technology of part features and modeling methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as not clearly specified

Pending Publication Date: 2008-01-02
ZHENGZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the model uses a vector method when defining the position and orientation in the tolerance. For the actual entity, it is not clear how to attach the coordinate system to the part.

Method used

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  • Part feature information modelling approach

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Embodiment Construction

[0008] In the part feature information model, see Figure 1, the main attributes are mainly used to describe the main attributes of structural shape features, including feature number, feature name, heat treatment requirements, etc. Dimensions and tolerances, shape and position tolerances, surface roughness and other precision features are linked by a two-way linked list. Properties related to structural shape features such as constant class, size and tolerance, shape and position tolerance, surface roughness, etc., use pointers to point to corresponding nodes of geometric elements, dimensions, precision and datum, and at the same time, in geometric elements, features, precision and datum In the data structure of , pointers are also used to point to the corresponding reference geometry nodes. Using this reference geometry method, on the one hand, the reference geometry expresses the geometric elements and features that the precision acts on; on the other hand, the reference geo...

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Abstract

The invention relates to a kind of modeling method for part characteristics. The invention can classify the shape characteristics based on constant class, and the intrinsic properties of constant class are as the parameters of parametric equation to realize digital expression; the direction relationships between shape characteristics adopt direction properties to realize digital expression; the accuracy properties is as the additional properties of shape properties, and the accuracy properties and shape properties are integrated by geometry link; and the information model of part is stored in database, and the CAX system can realize the integration of CAX by sharing database.

Description

Technical field [0001] The invention belongs to the field of manufacturing informatization and is used for modeling and sharing product feature information in a CAX integrated system. In particular, it relates to a feature information modeling and storage method. Background technique [0002] At present, feature modeling technology is one of the effective methods to solve CAD / CAPP / CAM integration technology. Structural shape features and precision features are the two main components of part information model. The structural shape feature of a part describes the geometric shape and its functional information with certain engineering significance, while the accuracy feature describes the allowable variation or error of the geometric shape and size, which is non-geometric information. According to the relationship between the precision information and the structure shape, the representation model can be divided into CSG-based, B-Rep-based and CSG / B-Rep hybrid models. Among ...

Claims

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Application Information

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IPC IPC(8): G06F17/30G06F17/50
Inventor 张琳娜赵凤霞
Owner ZHENGZHOU UNIV
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