An approach to mapping machining feature to manufacturing feature volume based on geometric reasoning for process planning
An approach to mapping machining feature to manufacturing feature volume based on geometric reasoning for process planning
复制标题
DOI：
10.1177/0954405415585377
复制
发表时间：
2017-05
期刊：
影响因子：
--
通讯作者：
Jinfeng Liu;Xiaojun Liu;Yalong Cheng;Z. Ni
中科院分区：
文献类型：
--
作者：
Jinfeng Liu;Xiaojun Liu;Yalong Cheng;Z. Ni
三维工序模型的有效构建对机械加工工艺设计的效率和质量有着重要的影响。提出了一种从机械零件的B-Rep映射加工特征到制造特征体的算法，并在此基础上生成了零件的工序模型。映射策略分三步执行。第一步，介绍了三种类型的加工特征：凹陷特征、凸起特征和过渡特征。在第二步中，搜索所选择的种子面及其相邻面的边缘，以生成加工特征面。最后一步将闭合应用于加工特征面，以通过应用其他相邻面及其延伸来生成紧凑实体。然后，将映射的制造特征体与最终零件模型相结合，形成工序模型。与现有的工序模型生成方法相比，该方法避免了从工程图到三维工艺模型、从加工知识到建模知识的不必要转换，大大缩短了建模规划时间。为了验证该方法的可行性和有效性，两个具有复杂加工特征的零件在开发的原型计算机辅助工艺设计系统进行了测试。
Efficient construction in three-dimensional working procedure model has an important effect on the efficiency and quality of machining process planning. This article proposes an algorithm to mapping machining features to manufacturing feature volumes from B-rep of mechanical part, and then, the working procedure models are generated. The mapping strategy is performed in three steps. In the first step, three types of machining features, such as depression feature, protrusion feature and transition feature, are introduced. In the second step, the edges of the chosen seed face and its neighboring faces are searched in order to generate the machining feature faces. The last step applies a closure to the machining feature faces to generate a compact solid by applying additional neighboring faces and their extensions. Then, the working procedure models are formed by combining the mapped manufacturing feature volumes with the final parts model. Compared with the existing working procedure model’s generation methods, this approach can avoid the unnecessary conversions from the engineering drawing to three-dimensional process models and from the machining knowledge to the modeling knowledge, which can greatly reduce the planning time on modeling. To validate the feasibility and validity of this approach, two machined parts with complex machining features are tested in the developed prototype computer-aided process planning system.