Hydraulic Forming Machine for Workpiece Forming, Hydraulic Control Unit and Method for Controlling a Hydraulic Cylinder of a Hydraulic Forming Machine

Hydraulic forming machine, in particular an impact forming machine, preferably a forging hammer, for forming a workpiece, comprising

• a hydraulic cylinder with a piston guided in a cylinder tube, which divides the cylinder tube into a first cylinder chamber through which a piston rod coupled to a bear passes, and into a second cylinder chamber, wherein the first cylinder chamber has a first hydraulic connection and the second cylinder chamber has a second hydraulic connection
• a hydraulic circuit with a control unit for controlling and/or regulating the operation of the hydraulic cylinder, wherein the hydraulic circuit comprises a first hydraulic valve which is coupled to the control unit in terms of control technology, is preferably designed as a proportional valve and is connected to the second cylinder chamber via the second hydraulic connection,
• wherein:
• the control unit is set up to regulate and/or control an opening width of the first hydraulic valve during execution of a working stroke intended for forming a workpiece in such a way that
• the first hydraulic valve is opened in a first phase and the bear is accelerated to a target speed in the first phase,
• in a second phase following the first phase, the opening width of the first hydraulic valve is reduced to an inflow opening width, and
• the first hydraulic valve is closed during a return stroke that runs in the opposite direction to the working stroke.