Prolongation of tool life in metal cutting is an effective factor to produce lower cutting forces and better machined surfaces. In this study, influence of ultrasonic vibration on this issue is analyzed by using experimental and numerical methods. Accordingly, turning tests are carried out on an AISI 4140 steel bar in two types of machining: conventional and ultrasonic assisted turning. After verification of developed model, tool wear results are discussed by analysis of heat and stress distributed on tool faces. Finally, it was revealed that periodically movement of cutting tool in vibratory turning caused to reduce contact time resulting lower heat conduction from deformed chip to tool rake face. As a result, lower wear has been propagated on tool faces compared to the tool worn in conventional turning. Besides, effect of cutting parameters on surface roughness is investigated by measurement and 3D analysis of surface topography.
کلید واژگان :Turning; Wear; Surface roughness; Friction; Thermal analysis; Stress analysis
ارزش ریالی : 600000 ریال
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