9SUN P, GRACIO J J, FERREIRA J A. Control System of a Mini Hydraulic Press for Evaluating Springback in Sheet Metal Forming[ J]. Journal of Materials Processing Technology ,2006,176 ( 1-3 ) :55-61.
10WANG Chang-li, CUI Yue-xian, CUI Li. Investigation of Pit- ting Corrosion Damage of a Hydraulic Press Trunk Piston [ J ]. Engineering Failure Analysis,2003,10 ( 2 ) :251-254.
