Patent ID: 6834522
Filing Date: 2004-12-28
Classification: B21C,B21D

Abstract:
A device for forming a workpiece exhibiting at least one hollow space in its interior by means of high internal pressure created by a working medium capable of flow in the sealed hollow interior of the workpiece, said device comprising: a forming tool with a cavity configured to accommodate the workpiece; and pressure generating means for generating high internal pressure in the workpiece, the pressure generating means including a displacement pump with a pressure converter comprising a longitudinally coupled displacement body with different sized working surface areas A1, A2, and a high pressure chamber facing a smaller of the working surface areas A2, the high pressure chamber having a suction side coupled to a suction port provided with an inlet armature and a pressure side coupled to a pressure port provided with an outlet armature, the displacement body being operative with a stroke frequency f, whereby a pressure p1 created on a primary side can be converted into a higher secondary pressure p2 by strokes of the pressure converter until an end pressure is reached on a secondary side, whereby a relationship:p2/p1=A1/A2 defines the increase in pressure.