Device for strengthening the surface of products, method and use thereof

A device for strengthening the surface of a workpiece by introducing compressive stress, wherein

• the device comprises a polymer strip which is provided with a metal foil on the surface of the side diverted from the surface of the workpiece in which foil bridges are formed to form projectiles, and it further comprises two electrodes adhering to the metal foil located on the polymer strip, where the bridges are formed between the contact surface areas of the metal foil,
• wherein the electrodes, between which a plasma is formed, are mounted in a support body, via which they are connected by means of flat conductors to a switch for switching large currents and voltages with a high voltage source,
• wherein the polymer strip provided with the metal foil tightly adheres to the support body with the electrodes, and the electrodes protrude above the upper surface of the support body to provide electrical contact with the contact surface areas of the metal foil,
• wherein for guiding and accelerating the projectiles, it further contains a nozzle provided with a sharp edge located on the lower side of its inlet opening, where the nozzle opening is orientated towards the surface of the workpiece being strengthened.

A device for strengthening the surface of the workpiece by introducing a compressive stress, where the device comprises the polymer strip which is provided with the metal foil on the surface of the side diverted from the surface of the workpiece in which foil bridges are formed to create a plasma,

• and it further comprises two electrodes adhering to the metal foil located on the polymer strip, where the bridges from which the plasma is created are formed between the contact areas of the metal foil, where the electrodes, are mounted in a support body, via which they are connected by means of the flat conductors to the switch for switching large currents and voltages with the high voltage source,
• where, for the accumulation of the energy necessary for the generation of plasma, it comprises the capacitor to be charged from the high voltage source,
• where the capacitor on its external surface comprises plates surrounding the dielectric with constant thickness, where the plates are connected to the conductors,
• where the switch has the form of a spark gap, where the spark gap inlet and the spark gap outlet are separated from each other by air or other suitable dielectric gas,
• where both the spark gap input and the spark gap output are formed on the conductor, and the capacitor is at least partially interposed between the support body and the polymer strip provided with the metal foil,
• wherein the polymer strip electrically insulating the workpiece from the high-voltage circuit is placed in tight contact with the workpiece,
• wherein the device comprises a second insulation layer isolating the exploding bridge from the support plate and protecting it from plasma ablation, where the electrodes pass through holes in the second insulation layer.