Study of Evaluation Criteria for Machinability of Steel

• Main Authors: Tsen-Hui Huang, 黃增煇
• Other Authors: WEN-XING HUANG
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/38175743524907654258

碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 91 === In this study, medium carbon steel and two free cutting steels; 1215 and 12L14, are investigated for the forces exerted on the tool, wear rate and tool temperature during turning and milling as well as surface roughness of the machined part and morphology of the machined chips after turning and milling. The basic idea is to find the parameters, which clearly reflect the machinability of steel. Then the parameters can be easily implemented to evaluate the machinability of steel without sophisticated apparatus. The results show that for the same cutting condition less cutting forces stand for better machinability. Less wear rate of tool means better machinability. The machined chips can also be used to judge the machinability of steel. The machined chips of free cutting steel are piecemeal while those of medium carbon steel are continuous. The curly, continuous chips are also more prone to interfere with the machining process and affect the surface quality of the machined part, and increase the wear rate of tool.