Chapters authored
Force and Specific Energy in Natural Rocks Cutting by Four-Axis Machine
This study used a four-axis computer controlled machine to determine the cutting forces (Cf), specific cutting energy (Sc) and specific energy (Se) affecting the processability of natural rocks. A total of 17 types of natural rocks were categorized according to their geological formations. This study consisted of three parts: (1) experimental measurement of the Cf resulting from processing natural rocks using a 6.0-mm diameter end mill cutting tool and a four-axis machine; (2) calculation of Cf, Sc and Se values; and (3) statistical analysis of the parameters. In terms of Cf, Sc and Se values, a statistically significant difference (P < 0.001) was observed among a depth of cut (dp) and feed speed (Va). It was found that the parameters that affected the processability of natural rocks were dp and Va. Accordingly, the processability of natural rocks processing type, dp and Va was found that affected. Simple linear regression was performed to examine the relationship between physicomechanical properties, and between Cf, Se and Sc values. As a result, regression equations were developed in consideration of the physicomechanical properties of natural rocks and the Cf, Sc and Se equation for the prediction of the efficiency of computer numerical control (CNC) machines.
Part of the book: Earth Crust