RAPID REVERSE ENGINEERING OF CASTINGS BASED ON SEPARATION OF CASTING AND MACHINING SURFACES

A-DEWS 2016 - Innovation of Life in Asia - Asian Design Engineering Workshop

Year: 2016
Editor: Umeda, Y.; Nomaguchi, Y.; Koga, T.; Kishita, Y.
Author: Urata, Akihisa; Date, Hiroaki; Kanai, Satoshi; Gotoh, Takayuki; Yasuda, Seiki
Institution: 1: Hokkaido University, Japan; 2: National Institute of Technology, Asahikawa, Japan; 3: Hokkaido Research Organization, Japan
Section: CAD/CAM and Computer Graphics
Page(s): 132-141

Abstract

Recently, it has become necessary to develop a more advanced reverse engineering (RE) technique that can generate CAD models of complex shapes from scanned mesh more efficiently. In this study, we propose a new efficient reverse engineering method of castings. In the method, machining and casting surfaces of the scanned mesh are separated, and precise surface fitting is applied only to the machining surfaces. The method can realizes an efficient RE process since different geometric processing and modeling techniques can be applicable to machining and casting surfaces individually. In addition, suitable geometric processes in the applications of the CAD models, such as machining margin addition and machining planning for machining surfaces in the duplication, can be automatically applied to each machining and casting surfaces, because they are recognized in our method. In this paper, we develop two methods. First, the surfaces are classified into the casting and machining surfaces based on triangle roughness. Second, boundaries of the casting surfaces are smoothed and modified so as to intersect machining surfaces for generation of the CAD models. We show some experimental results using some scanned meshes of castings.

Keywords: Reverse engineering, Castings, Triangular mesh, Roughness, Surface extraction, Casting surface boundary modification