中文摘要：

在机械加工零件三维工艺设计中，需要根据零件的形状、尺寸公差等识别加工特征，按照加工特征进行工艺设计和工艺路线规划，生成从零件毛坯到最终零件的各个工序的实体模型。结合零件的几何拓扑结构和制造工艺信息，建立一套面向机械加工的特征定义和分类体系，在特征识别和三维工艺设计技术的基础上，提出中间工序模型的概念和中间工序模型自动生成的模型恢复方法，根据各个加工特征的工艺方法和工艺参数，按照零件的加工路线自动生成中间工序模型。实例验证结果证明，该方法可为实现基于三维模型的机加工艺设计提供参考。

英文摘要：

In the 3D process design of machining part, according to machining features such as shape, dimensional tolerance and so on, then carry out process design and process planning, and generate entity modal of every working process from the blank part to the final part. Geometric topology structure and manufacturing process information are combined to set a feature definition and classification system for machining. The concept of intermediate process model and the model recovery method automatically-generated in an intermediate process model is put forward on the basis of feature recognition and 3D process design technology. According to process method and process parameter of each machining feature, automatically generate intermediate process model based on part processing rout. The test results proved that the method offers reference to achieve 3D model-based machining process design.