Mechanism of Improvement Effect of Ultrasonically Activated Coolant on Finished Surface Roughness in Cylindrical Grinding

Abstract

The use of an ultrasonically activated coolant improves the roughness of a ground surface compared with that of an ordinary coolant. By evaluating the change in working surface conditions, it has been clarified that the ultrasonically activated coolant suppresses loading and wheel wear, and maintains a good the working surface condition. The flushing effect of the ultrasonically activated coolant, promoted by giant vibration acceleration, prevents the deposition and welding of chips on the working surface. Since the density of kinetic energy in the coolant stream increases, the activation helps the coolant to overcome the airflow due to wheel rotation and to reach the grinding point efficiently. This promotes the cooling and lubricating effects of coolant, and then protects the cutting edges from crushing, falling off and dulling. On the basis of the results, it can be said that the effects of coolant activation suppress the generation of scratches, and consequently improve the finished surface roughness.

Test of Focusing and Superposition for Variable Strength Activation of Coolant in Precision Machining

“…It is known that using coolant in a material removal process can improve productivity [1][2][3]. So far, a number of cooling methods have been proposed [3][4][5][6][7][8][9][10][19][20]. For increased cooling effectiveness, active cooling and activated cooling have been proposed and examined [11][12][13][14][15][16].…”