Method and mould arrangement for explosion forming

A tool arrangement (1) for explosive forming of a work piece (12), comprising:

• a moulding tool (2) having a contact surface (20) defining an opening (17) connected to an intake area (15) into which the work piece (12) is introduced, the work piece (12) having a work piece cavity (13) whose wall has a closed shape in cross-section;
• an ignition tube (8) having a contact surface (18) corresponding in shape to said contact surface (20) of said moulding tool (2) and wherein said ignition tube (8) is configured for containing and igniting an explosive gas mixture (23) in order to generate a detonation front, wherein the ignition tube (8) and the work piece (12) directly abut each other to form a sealed path having a substantially constant cross-section for the propagation of the detonation front and wherein in a working position, said contact surface 120) of said moulding tool (2) and said contact surface (18) of said ignition tube (8) cooperate to clamp the workpiece therebetween:
• and
• means (28) for at least partially filling the work piece cavity (13) with liquid (26), wherein the explosive gas mixture (23) is in direct fluid communication with the surface of the liquid (22) prior to ignition.