Reshaping method and device for carrying out the method

A method of reshaping a workpiece with a reshaping force applied by a reshaping tool, in which, prior to applying the reshaping force, a first portion of the workpiece is brought to a temperature higher than a temperature of a second portion of the workpiece so that a temperature gradient is provided within the workpiece, to be reshaped, between said first and second portions and wherein a direction of the reshaping force is oriented with respect to arrangement of said second and first portions so that reshaping is effected in said first portion of the workpiece when the reshaping force, from the reshaping tool, is applied upon said second portion of the workpiece;

• wherein, the reshaping tool comprises a sonotrode and wherein, after formation of the temperature gradient, the reshaping tool is brought into contact with the workpiece to be reshaped, so that the second portion of the workpiece is heated during or before reshaping of the workpiece by at least partial absorption of ultrasonic vibration provided to the workpiece by the sonotrode and the reshaping force, from the reshaping tool, is first applied to the second portion of the workpiece.