Research and application of feature-based automatic generation technology of 3D process model
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摘要: 在三维零件加工工艺规划系统中工序模型自动创建是其的核心功能，为了提高三维工序模型建模的速度和质量，提出了一种基于特征切削体的工序模型自动建模方法，即当前工序的工序模型为前一工序模型“减去”特征切削体模型。它首先利用加工特征和加工特征工步建立工序模型与工艺过程的关联关系，并在切削体库中通过加工特征匹配得到特征切削体；然后根据加工特征的尺寸参数和定位参数，实例化特征切削体，并确定其定形参数和定位参数，最终形成切削模型；最后将前道工序模型与特征切削体模型做布尔减运算，则得到当前工序的工序模型。这种方式以加工特征和特征切削体为核心、以毛坯模型为基础，以工艺信息为依据，以余量尺寸为驱动，按实际加工顺序正向生成各工序模型，这种正向的工序模型生成方法和现实的零件加工过程是一致的，经过在企业的应用验证，完全满足企业应用需求，大大降低工艺人员在工序模型的工作量，使其有更多的精力和时间进行工艺改进和工艺创新工作，提升我国制造企业工艺水平和工艺能力。Abstract: Automatic process model creation is the core function of the 3D part machining process planning system. In order to improve the speed and quality of three-dimensional process model modeling, this paper proposes an automatic modeling method based on the featured cutting body, which means the operation model of the current operation is “subtracted” from the previous operation model. Firstly the correlation is established between the process model and the process by using the machining features and machining feature work steps, and the feature cutting body is obtained by matching the machining features in the cutting body library. It instantiates the feature cutting body according to the dimensional and positioning parameters of the machining features, and determines its defining parameters and positioning parameters to finally form the cutting model; then does the Boolean subtraction operation between the previous process model and the feature cutting body model to obtain the process model of the current process. This approach takes machining features and feature cutting body as the core, blank model and process information as the basis, and margin size as the driver, and generates each process model according to the actual processing order in a forward direction. This forward process model generation method is consistent with the real part processing process, and after application verification in enterprises, it fully meets the enterprise application requirements, greatly reduces the workload of process personnel in the process model, so that they have more resource and time for improvement and innovation of the process. It also could be used in improving the process level and capability of Chinese manufacturing enterprises.
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Key words:
- machining features /
- 3D process model /
- automatic model generation technology /
- 3D CAPP
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表 1 特征切削体库
序号 特征名称 特征切削
体简图特征切削体
定形参数特征切削体
定位参数1 外圆柱面 
内径D1
外径D2定位中心点O(x,y,z)
方向D(x,y,z)2 孔 
直径D 定位中心点O(x,y,z)
方向D(x,y,z)3 外圆锥面 
内大径D1
内小径d
外径D2定位中心点O(x,y,z)
方向D(x,y,z)4 内圆锥面 
大径D
小径d
锥角a定位中心点O(x,y,z)
方向D(x,y,z)5 A型键槽 
键槽宽B
键槽长L定位中心点O(x,y,z)
方向D1(x,y,z)
方向D2(x,y,z)6 半月型键槽 
键槽宽B
键槽半径R定位中心点O(x,y,z)
方向D(x,y,z)… … … … … 
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