关键词: STEP-NC, 制造特征, 重构机制, 字典实体

Abstract:

Manufacture feature reconstruction is a key technology in STEP-NC machining program extraction. First of all, entities in STEP-NC data model were coded, then raw node data and dictionary entity data were constructed. Node-entity data was constructed by matching node data and dictionary entity data. According to the geometry, entity was divided into five classes, there were feature, profile, curve, point and placement. In the course of reconstruction, node’s attribute content construction in upper class was completed by its entity reconstruction function in lower class. In the same class, node’s geometry was constructed from above to below according to inherit relationship between entities. In such a way, a test prototype was developed and verified by program in STEP-NC FDIS, and the reconstructive mechanism is proved by the result.

Key words: STEP-NC, manufacture feature, reconstructive mechanism, dictionary entity