中文摘要：

叶轮是离心压缩机的核心功能部件,极易出现损坏。受损叶轮再制造技术国内面临的主要问题是缺少设计数据。为此,提出一种基于受损叶轮结构特征建立再制造目标模型的方法。设计了离心压缩机受损叶轮的再制造流程;对受损叶轮原始三维点云进行滤波和精简;针对叶轮叶片的损伤区域和未损伤区域,分别提取并拟合叶片截面的边界曲线;重建叶轮叶片的再制造目标模型,通过布尔运算得到叶片损伤部位的三维模型。以离心压缩机受损叶轮为例,进行了再制造实验,再制造后的叶轮误差精度在±0.5 mm范围内,满足工作要求并已投入使用,证明了本方法的可行性。

英文摘要：

Impeller is key functional unit of centrifugal compressor. It is widely used in industrial and agricultural fields and often subjects to damage because of the bad work environment. Since the technology of remanufacturing the impeller has been dominated by foreign companies,domestic companies have to invest a tremendous amount of cost and time in having damaged impeller repaired. This paper is to put forward a method in an attempt to remanufacture damaged impeller based on structure characteristics. Firstly,the process of remanufacturing the damaged impeller was designed. Secondly,the point cloud data of damaged impeller was acquired; the original point cloud data were filtered and simplified reasonably to improve modeling accuracy and efficiency. Thirdly,for the un-damaged area of the impeller blade,the SS,PS,LE and TE of the cross-section point cloud were automatically identified,the cross-section curve of the impeller blade was extracted and fitted based on design features; for the damaged area of the impeller blade,the boundary curve of the impeller blade cross-section was extracted and fitted using grey prediction method; the 3D digital models of impeller blade were reconstructed and the 3D model of damaged blade was obtained via Boolean operation. Finally,the 3D point cloud processplatform and reconstruction experiment platform were introduced; using laser cladding forming technology and adaptive grinding,an application example of remanufactured impeller was given,which proved that the method is feasible,and the future research direction was also proposed.