Deep drawing presses

Controlling the pad of a deep drawing press

The deep drawing presses are very complex machines used for the cold production of a finished product starting from plane metal: pans, sinks, vehicle bonnets and doors are the typical products obtained through the deep drawing process.

The press consists of a vertical structure allowing the movement of the two main axes: the moving table on the machine lower section, called ram, and the pad in the lower section, called pressure bar. The mold housing the metal to be deep drawn is positioned between the two axes.

The metal is pressed by the ram towards the mold and it is simultaneously supported by the pad: being trapped between the two axes, it is gently moved to the mold inner section in order not to be broken or deformed.

The pad is moved by the hydraulic cylinders which, during the first processing phase, accelerate its down  movement till reaching the ram speed and afterwards they slow down and lead the pad descent.

At the end of the deep drawing process the pad goes back to its starting position where it is sometimes used to extract the finished piece.

Duplomatic Oleodinamica has been supplying hydraulic blocks for the safety and the handling of the moving table for years and has developed a position and pressure control system for the pad management.
The supply consists of proportional valves and digital multi-axis cards and can be interfaced with the most widely used industrial and PC-based controllers, thus ensuring the axis synchronization and an effective control of the pad reaction power.