Method and mould arrangement for explosion forming

A method for explosive forming of a work piece (12) having an interior by means of a gas explosion, comprising:

• arranging the work piece (12) in an intake area (15) of a moulding tool (2);
• at least partially filling a work piece cavity (13), whose wall has a closed shape in cross-section, with liquid (26), providing in an ignition tube (8) an explosive gas mixture (23) in direct fluid communication with a surface of the liquid (22) prior to ignition, wherein the ignition tube (8) and the work piece (12) together form a sealed path having a substantially constant cross-section;
• triggering the explosion by igniting the explosive gas mixture (23) in the ignition tube (8) in order to form a detonation front propagating through the ignition tube and into the interior of the work piece (12), wherein the gas mixture (23) is at least partially introduced through the liquid (26).

A method for explosive forming of a work piece (12) having an interior by means of a gas explosion, comprising:

• arranging the work piece (12) in an intake area (15) of a moulding tool (2);
• at least partially filling a work piece cavity (13), whose wall has a closed shape in cross-section, with liquid (26), providing in an ignition tube (8) an explosive gas mixture (23) in direct fluid communication with a surface of the liquid (22) prior to ignition, wherein the ignition tube (8) and the work piece (12) together form a sealed path having a substantially constant cross-section;
• triggering the explosion by igniting the explosive gas mixture (23) in the ignition tube (8) in order to form a detonation front propagating through the ignition tube and into the interior of the work piece (12) wherein the gas mixture (23) is a substantially stoichiometric ratio of hydrogen and oxygen at a pressure in the range of 60 to 200 bar prior to ignition and the ratio of the gas mixture (23) to liquid (26) is in the range of 1:1 to 1:20.