Striking unit and method for material processing by the use of high kinetic energy

Abstract

The present invention relates to a method at the material processing by the use of high kinetic energy, comprising a piston which is driven from a start position by a hydraulic system pressure (pS) by means of a drive chamber in order, by only one stroke, to transfer high kinetic energy to a blank/tool to be processed, whereafter there is a risk that a rebound of the piston will occur, and the method comprises that a step is taken in connection with said stroke performed, which step prevents said piston from making a rebound with an essential content of kinetic energy in order to avoid negative effects as a result of a rebound, whereafter the piston is returned to said start position by means of a second chamber, wherein said step comprises that a valve means closes the driving connection between the system pressure (pS) and the piston, wherein said step comprises that said valve means is controlled by a pilot valve controlling the entire striking progress, and that said second chamber is pressurized with the system pressure (pS) during the entire striking progress.

Dependencies are inferred from the claim text.