Device for positioning a bending tool

A method for positioning a bending tool by means of an electromagnet, the method comprising the steps of:

• providing the bending tool comprising a tool holder, the electromagnet and a magnet holder of a magnetizable material coupled to the electromagnet, wherein the bending tool is held on a retaining-carriage guide,
• displacing the bending tool, including the tool holder, the electromagnet and the magnet holder along the retaining-carriage guide via a retaining carriage, and thereby displacing the electromagnet along a magnetic guide extending along the retaining-carriage guide,
• energizing the electromagnet with a nominal voltage for generation of a nominal force as magnetic force,
• increasing or decreasing the nominal force by a pulse width modulation or by a change of a voltage or by a change of the current capacity in time spans for generation of the necessary magnetic force, depending on:
• the tool weight and/or
• the inertial forces acting on the bending tool and/or
• the friction acting in the retaining-carriage guide and/or
• the orientation of the magnetic force relative to the movement direction and/or
• the size of a contact area of respective contact faces of the electromagnet and the magnet holder and/or
• an extension of the magnetic field into regions having further magnetizable workpieces.