Modeling and Simulation of Machining-induced Surface Integrity Characteristicsof NiTi Alloy

Investigation Of The Effects Of Machining Parameters On Tool Life And Surface Roughness During The Face Milling Of The NiTi Shape Memory Alloy With Uncoated Tools

“…It is known from the literature that with a higher cutting speed, the surface roughness of the workpiece can be reduced [70][71][72][73][74][75]. The reason for lower surface roughness at lower cutting speeds (less than 20 m/min) may be attributed to the BUE that is formed on the cutting tool, which increases the nose radius [38][39][40][41][42][43][44][45]. The scanning electron microscope (SEM) image of BUE that is formed on the cutting tool at 20 m/min cutting speed is shown in Figure 5a.…”

“…to 35 m/min, surface roughness increases. This is a consequence of flank wear ( Figure 5b) of cutting tool at high temperature because the friction coefficient increases with cutting speed [40][41][42][43][44][45][60][61][62][63][64][65]. An improvement in surface roughness due to the increase in cutting speeds is an expected result [65][66][67][68][69][70][71][72][73][74].…”

“…The NiTi alloy is in martensitic phase at low temperatures and in the austenitic phase at high temperatures [4]. A review of the literature showed that different manufacturing processes are used for the machining of NiTi alloy such as laser processing method [5][6][7][8][9][10][11][12][13][14][15][16], electrical discharge machining (EDM) [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], electrochemical polishing [32] and abrasive water jet processing method (AWJM) [33,34] for shaping NiTi alloy and also conventional machining methods (Turning [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50], milling…”

“…All these problems are due to the shape memory effect, super elasticity effects, high ductility and large deformation hardening. Therefore, the machining of such alloys is difficult [3,35,[38][39][40][41][42][43][44][45]. NiTi shape memory alloys cause high strain hardening due to the mechanical loads they are exposed to during machining and the high temperatures that occur during cutting.…”

“…NiTi shape memory alloys cause high strain hardening due to the mechanical loads they are exposed to during machining and the high temperatures that occur during cutting. All these factors accelerate the damage caused by flank wear of the cutting tools [39][40][41][42][43][44][45]. In addition, the shape memory feature causes the material to have a varying elasticity module during manufacturing process, which affects the machinability of the material and the dimensional accuracy of the final product [4,49,50,53,60].…”