A Study on the Interference Detection and Correction in 5-Axis CNC Incremental Forming

Abstract

A kind of high efficient and accurate method for the interference detection and correction of 5-axis CNC incremental forming tool and sheet part on the basis of STL(Sterolithography) model is proposed considering the detection efficiency, accuracy and correction. STL model of sheet part is discretizated along the edges after the triangular facets have been subdivised according to the minimum edge of the cube obtained by octree division algorithm so that the octree segmentation for the discrete point cloud model are more regularly. And in order to directly detect the interference area without recursive search, the discrete point cloud model is expand to an octree division model with index sequence. Meanwhile the forming tool is surrounded by axis-aligned bounding boxes and the interference location is detected through the octree division model roughly. The interference location is detected in detail through the discrete points in cubes of the octree division model and the forming tool of the cylinder shape. The interference correction is conducted on the section cutting plane which is along the axis direction of forming tool at interference points. The case study shows that the proposed method can quickly find the interference as well as give the correction, and the whole operation process is stable and reliable.