Using multiple performance index for best-fitted design of computer numerical control turning process

Abstract

ABSTRACT Typically, the turning process to be executed using turning machine tools is designed by experienced part programmers; however, the cutting efficiency and trade-off of the dimensional accuracy in the machining process present issues that may be difficult to deal with. Therefore, this study aims at systematically realizing a best-fitted design for the computer numerical control (CNC) turning process by referring to multiple performance indices, such as machining time, machining energy, surface roughness, and radius error. First, the turning process notation and performance evaluation index are defined according to the common side-change process, tool-change process, machining process, and machining results of the turning process. Next, the turning process map is established by the defined turning process notation; here, the comparison table of the total performance index (PI) consisting of the machining time, machining energy, surface roughness, and radius error is calculated and established. Finally, the best-fitted turning process satisfying the cutting efficiency requirement or dimensional accuracy requirement is selected according to the PI comparison table. The results obtained from the experiments performed on a CNC turning machine tool demonstrate that the best-fitted turning process can shorten the machining time by 39.04% (estimated machining time) and 34.24% (actual machining time).