Method and an arrangement to determine a running value of the gap during the electrochemical machining

摘要

A method and an arrangement ( 1 ) for determining an actual value of the gap ( 4 ) between the work piece ( 2 ) and the electrode ( 3 ) during a process of electrochemical machining. According to the invention first process control means ( 30 ) are arranged to supply a set of machining current pulses (Im) to the electrode and the work piece. Second process control means ( 32 ) are arranged to perform a measurement of an operational parameter (U) representing a value of the gap ( 4 ) in real time under operational conditions. The second process control means ( 32 ) comprise means to determine the actual value of the gap ( 55 a) based on the measurement of the operational parameter and logical unit ( 55 b) to actuate the positioning means ( 8 ) to translate the electrode ( 3 ) in case the measured value of the gap deviates from the preset value of the gap.