Compensation of Tilting and Horizontal Displacement of Upper Die, Relative to the Lower Die, at Out-of-Center Forming Load by a Closed-Loop Control System

Abstract This paper presents a new method of compensation, including a closed loop control system for the tilting and horizontal displacement of the ram. At the Institute for Metal Forming at the University of Stuttgart, a floating clamping plate, attached to the ram by hydraulic cylinders, was developed. This clamping plate can be horizontally and vertically positioned by a closed loop control system using proportional valves. By experimental research, done with a hydraulic 4000 kN single acting press, it was shown that compensation of the tilting and horizontal displacement of the upper die relative to the lower die is possible.