Device for strengthening the surface of products, method and use thereof
AssigneeUstav Termomechaniky Av Cr, V.V.I.
InventorJiří Šonský
Life of this patent
Estimating the term…
Abstract
A method and a device for strengthening the surface of workpieces, in particular of metal ones, by mechanical effects accompanying the impact of small projectiles or by mechanical effects accompanied by the impact of a shockwave induced by plasma created by electric evaporation of a metal foil are described.
Claims20
A device for strengthening a surface of a workpiece by introducing compressive stress, wherein
- the device comprises a polymer strip which is provided with a metal foil on a surface of a side diverted from the surface of the workpiece in which foil bridges are formed to form projectiles, and the device further comprises two electrodes adhering to the metal foil located on the polymer strip, where the foil bridges are formed between 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 conductors to a switch for switching currents and voltages with a voltage source,
- wherein the polymer strip provided with the metal foil adheres to the support body with the electrodes, and the electrodes protrude above an 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, the device further contains a nozzle provided with an edge located on a lower side of an inlet opening of the nozzle, where the inlet opening of the nozzle is orientated towards the surface of the workpiece being strengthened.
A device for strengthening a surface of a workpiece by introducing a compressive stress, where the device comprises a polymer strip which is provided with a metal foil on a surface of a side diverted from the surface of the workpiece in which foil bridges are formed to create a plasma,
- and the device further comprises two electrodes adhering to the metal foil located on the polymer strip, where the foil bridges from which the plasma is created are formed between contact areas of the metal foil, where the electrodes are mounted in a support body, via which they are connected by conductors to a switch for switching currents and voltages with a voltage source,
- where, for the accumulation of the energy necessary for the generation of plasma, the device comprises a capacitor to be charged from the voltage source,
- where the capacitor on its external surface comprises plates surrounding a dielectric plate with constant thickness, where the plates are connected to the conductors,
- where the switch has the form of a spark gap having a spark gap input and a spark gap output, where the spark gap input and the spark gap output are separated from each other,
- 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 voltage is placed in contact with the workpiece,
- wherein the device comprises a second insulation layer isolating the foil bridges from the support body and protecting the support body from plasma ablation, where the electrodes pass through holes in the second insulation layer.
Dependencies are inferred from the claim text.