Geometric model was extracted through ACIS, manufacturing feature was recognized reconstructed through establishment of manufacturing feature library and using of Rule-based method.
通过ACIS提取几何模型信息，建立制造特征库与采用基于规则的方法实现对制造特征的识别与重构。
The modelling is based on part feature, its geometry and process information are from the manufacturing requirement.
该造型的特点一是基于特征，其几何信息和工艺信息主要从制造要求出发；
It describes the STEP-NC data model based on the extension of step, introduces some major concepts like manufacturing feature and working step, overviews the data model for milling.
首先简要介绍了STEP - NC数据模型与STEP的关系以及制造特征、工步等主要概念，概括了铣削模型的基本结构和组织方式。
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