04-10-2017, 03:24 PM
The potential of ultrasonic assisted tools with undefined and defined sharp edges is shown for grinding and turning, while the cutting mechanisms are different. The ultrasonic aid for the grinding tools is applied to overcome the fracture toughness and thus induce cracks in the workpiece material. This effect can be used to increase the maximum rate of removal of the material or to reduce the process forces compared to a conventional milling process in comparable process parameters. Apart from the benefits unfortunately the SSD is higher for ultrasonic support which has to be taken into account in the design of the process strategy. Ultrasonic support for ultra-precision turning is applied to reduce the excessive wear of the diamond tool for the hardened steel ductile machining. Kinematic consideration is the key to achieving proper surface conditions, as well as reducing tool wear. Research shows that conventional parameters such as shear depth a (ind p) and feed velocity f lead to similar results compared to conventional ultra-precision machining. However, consideration of the kinematic parameters input duration ED and input speed v (ind in) is also mandatory and shows the massive influence of the ED input duration in terms of surface roughness. Theoretical investigations also show the potential of the higher frequencies for the ultrasonic assisted turning process.