Nonsimultaneous Press Forming Using 4-axes Direct Drive Digital Servo Press

Abstract Presses having high performance are required to manufacture forming parts with high added value using more advanced technique. A 4-axes direct drive servo press was developed to attain this purpose. The press has conquered the press forming problems such as how to get a bottom dead center with high accuracy and how to keep parallelism of slides under eccentric force. The developed press has 4 linear scales at each corner of the slide, and these linear scales monitor each slide position. When the slide is tilted by the eccentric force, accurate parallelism is attained with the feedback control. The press has made it possible to visualize the dynamic movement of press machine such as keeping the slide parallel with the feedback control. This visualization has made it possible to know mechanism of press forming being worked, and is useful to solve many problems of the press forming.