Effect of vibration characteristic and lubricant viscosity on deep drawing process with hydraulic counter pressure and vibration to tool system

Abstract

A new experimental apparatus is constructed in order to improve the lubrication condition in the deep drawing of A5052P–O aluminum alloy sheets with thickness of 0.6 mm. A punch is oscillated in a longitudinal mode by mechanical vibration with frequency of 5 to 80 Hz. A die surface is also oscillated in a longitudinal mode by ultrasonic vibration with frequency of 21 kHz. The hydraulic counter pressure of 1.5 MPa is applied throughout the drawing process. The suitable application of the vibration can make remarkable increase of the limiting drawing ratio (L.D.R.) up to 2.05 and reduction of the maximum punch load in spite of the use of a poor lubricity paraffin oil with viscocity 2 cSt at 40°C.