基于MIMICS的含内腔结构零件逆向设计  

Reverse Engineering Design for Parts with Cavum Structure Based on MIMICS

作　　者：盛选禹[1] 王联奎[2] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]菏泽学院机电工程系,山东菏泽274100

出　　处：《科技导报》2009年第7期85-87,共3页Science & Technology Review

摘　　要：对具有复杂内腔结构的发动机零件实体进行了逆向工程设计。首先利用工业CT机对含有内腔结构的发动机零件进行扫描;将扫描的截面图片导入医学软件MIMICS中,并导出转换为STL格式的云点模型;利用大型设计软件CATIA的逆向设计功能,将云点图像转换为三维实体模型。通过上述方法,实现了对含有内腔结构的发动机零件进行了逆向设计,得到了发动机零件的实际结构尺寸,解决了激光扫描只能扫描零件外表面轮廓的不足,可用于其他具有复杂内腔结构零件的逆向设计。但由于CT扫描图片的精度偏低,因此,需对模型进行处理后才能用于工程实际加工。Reverse Engineering （RE） Design is to determine dimensions of an object that already exists and to manufacture copies with the same dimensions accordingly. In this paper, reverse engineering design was carried out for an engine part with a complicated cavum structure. With traditional RE method, laser is used to scan and measure the real components. But it can only scan the profile and simple holes of the component. For components with complicated cavum structure, the laser scan method will fail. The component discussed in this paper is a vehicle engine with complicated cavum structures. Its components contain more than 20 large holes, more than 50 smaller holes with diameters less than 10 mm. The RE design is carried out as follows. Firstly, the CT photos are taken by scanning the engine Dart with cavum structures. Secondly, the CT photos are imported into medical software MIMICS, and are transformed to STL format point cloud model. Lastly, the STL format point cloud model is imported to large design software CATIA. The point cloud is transformed to a 3 dimensional solid model by reverse engineering design function in CATIA. By this method, the part with cavum structures can be reversely designed. Because the precision of CT photos is low, the 3 dimensional engine model is not perfectly satisfactory, and post processing should be made before it could be used in the real machine engineering.

关 键 词：逆向工程 CT照片 三维模型 发动机 

分 类 号：TP391.72[自动化与计算机技术—计算机应用技术]