Modeling the effect of tool edge radius on contact zone in nanomachining

Chip formation dependence of machining velocities in nano-scale by molecular dynamics simulations

“…The sample size is 80a 0 × 60a 0 ×4a 0 , about 78000 atoms, and the tool size is 50a 0 ×50a 0 ×4a 0 , about 72000 atoms, and a 0 is the crystal constant of copper (3.615Å). A periodic boundary condition is applied along z direction to eliminate the effect of free surface [15]. In addition, eight layers of the left and the bottom edges are fixed, and eight layers next to them are a thermostat region which surrounds the Newtonian atoms.…”

“…Maekawa and Itoh [10] and Zhang and Tanaka [11] used this method to analyze the friction and the tool wear characteristics. Komanduri et al [12][13][14][15] used it to investigate the effect of tool geometry on the cutting and the thrust forces and the sub-surface deformation. Machining tools with different rake angles [14] and a rounded tool geometry with a different edge radius [15] were utilized.…”

“…Komanduri et al [12][13][14][15] used it to investigate the effect of tool geometry on the cutting and the thrust forces and the sub-surface deformation. Machining tools with different rake angles [14] and a rounded tool geometry with a different edge radius [15] were utilized. The effect of different interatomic potential on cutting results was studied by Pei et al [14].…”

The Influence of Twist Drill Main Cutting Edge Preparation in Drilling Process

“…The geometry of the edge preparation influences the thermomechanic aspects of the cutting process. From which it is worth pointing out the format of the deformation zone, the temperature distribution in the cutting process, the machining forces, the chip formation and flow, the superficial integrity of the work piece and the tool's resistance to wear 2,[3][4][5][6] . Due to its importance in the machining field, cutting edge failures and some benefits related to the protection of the cutting edge achieved by different processes have been the subject of studies by several researchers [7][8][9][10][11][12] .…”

“…Apart from that, in Figure 7a,b,c a significant difference on the cutting edge shape can be observed, thus leading to three distinct contact zones between the tools and the raw material. According to Hosseini & Vahdati 4 , Woon et al 5,6 and Fang & Wu 10 , this factor can influence the surface quality, the cutting force and the thrust force. In Figure 8 shows the results of 18 roughness measurements from 400 machined holes, from which the chamfered tool clearly achieved the lowest roughness values while the honed tool recorded the highest ones.…”