Patent ID: 7285761
Filing Date: 2007-10-23
Classification: B23K

Abstract:
1. Method for enhancing formability of a metallic workpiece ( 4 ) by means of electric current application to a workpiece to be formed by a subsequent forming operation at the elevated temperature by being compressed between a set of dies, the method characterised in that; controlling magnitute and timing of electric current with an electronic control unit ( generating electric current at the second coil of said transformer(s) in a controlled manner, connecting said current to two electrode sets ( keeping temperature of the dies between a predetermined temperature range by taking away heat from the dies in a controlled manner, forming said workpiece between at least two dies by being compressed between said dies, achieving a predetermined heat transfer amount within a certain range from the workpiece to the dies while said workpiece is being compressed between dies, cooling of electrical connections ( varying heat amount of taken away from the connectors and tools by variation of their actual temperature such that keeping their temperatures between their predetermined ranges.