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 plunger (2) which is driven from a start position by a hydraulic system pressure (pS) by means of a drive chamber (1 1) in order, by only one stroke, to transfer high kinetic energy to a blank / tool (4) to be processed, whereafter there is a risk that a rebound of the plunger (2) will occur, and the method comprises that a step is taken in connection with said stroke performed, which step prevents said plunger (2) 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 plunger (2) is returned to said start position by means of a second chamber (10), wherein said step comprises that a valve means (5) closes the driving connection between the system pressure (pS) and the plunger (2), wherein said step comprises that said valve means (5) is controlled by a pilot valve (7) controlling the entire striking progress, and that said second chamber (10) is pressurized with the system pressure (pS) during the entire striking progress.

Description

technical field [0001] The invention relates to an impact unit for a method of material processing by using high kinetic energy, comprising a plunger for transferring high kinetic energy to a blank / tool ​​to be processed, connected to a system arranged to drive said plunger a drive chamber for pressure, valve means arranged to control flow to said drive chamber, and a control system for regulating said valve means, wherein said control system is directly or indirectly connected to a sensor through which said valve means Controlled by said plunger in association with a first impact, so as to reduce or break off the force on the plunger, thereby preventing additional subsequent impacts with a substantial portion of kinetic energy, and to a method wherein said performed The impact is associated with a step which prevents the plunger from rebounding with a major part of the kinetic energy in order to avoid negative effects due to the rebound. Background technique [0002] In hi...

AI Technical Summary

Problems solved by technology

With hydraulics, it is technically possible, but most valves on the market have to take too long to adjust to be able to use shorter adjustment times that may be required, usually within 20 milliseconds

Regarding spring machines, it is quite obvious that it is somewhat difficult to form a mechanical device that resolves the spring bias within a few milliseconds

As indicated above, most known hydraulic high-speed machines are equipped with valve mechanisms that cannot be adjusted quickly enough to block the advancing oil, and thus the pressure generated in the drive chamber of the plunger

The reason for this is that hydraulic valves with high flows (300 to 1000 l / min) usually require relatively long adjustment times

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