Patent RU-2699367-C2 (RU)
Title: Electrochemical treatment method for rotors or stators for moineau pumps
Inventor: VANGENKHAJM Kristof
IPC: B23H9/04
Filed: 2015-05-14
Granted: 2019-09-05
Abstract: FIELD: chemistry. 
     SUBSTANCE: present invention relates to electrochemical treatment of elongated parts. Electrochemical method for production of elongated articles includes providing at least one electrode of continuous closed shape, which forms a through hole and includes at least one cam inclined relative to axis of relative axial movement of said electrode of closed shape relative to workpiece, wherein relative rotation of closed-shape electrode relative to workpiece together with said relative axial movement results in production of at least one continuous cam, having desired pitch, on workpiece, and said hole has a size smaller, at least in part, than the dimension on the outer surface of the initial workpiece, such that relative rotation and relative axial movement of said electrode within the original extreme outer surface produces a continuous axial cut along the longitudinal axis of the workpiece, removing from part of extreme external source surface of workpiece at least one detachable excess piece located outside electrode of closed shape, thus forming final outer surface of workpiece, which is smaller than initial extreme external surface of workpiece; or providing at least one electrode of continuous closed shape, forming through hole and including at least one cam inclined relative to axis of relative axial movement of said electrode of closed shape relative to workpiece with tubular shape, wherein relative rotation of closed-shape electrode relative to workpiece together with said relative axial movement results in production of at least one continuous cam, having desired pitch, on workpiece, and said hole has a size greater than at least a portion of the inner surface of the initial workpiece with a tubular shape, such that relative axial movement of said electrode outside the initial extreme inner surface of the workpiece performs a continuous axial cut along the longitudinal axis of the workpiece, removing from part of extreme initial inner surface of workpiece at least one detachable excess piece located inside electrode of closed shape, thereby forming one final extreme inner surface of workpiece, which is greater than initial extreme inner surface of workpiece with tubular shape; or providing at least one electrode of continuous closed shape, forming through hole and including at least one cam inclined relative to axis of relative axial movement of said electrode of closed shape relative to workpiece, wherein relative rotation of closed-shape electrode relative to workpiece together with said relative axial movement results in production of at least one continuous cam, having desired pitch, on workpiece, and said hole has a size smaller, at least in part, than the dimension on the outer surface of the initial workpiece, such that relative rotation and relative axial movement of said electrode within the initial extreme outer surface of the workpiece produces a continuous axial cut along the longitudinal axis of the workpiece, removing from inside part of extreme external initial surface of workpiece, at least one separated excess piece located inside electrode of closed shape, thus forming a tubular shape with one final extreme inner surface of the workpiece; supplying to said power supply electrode and electrolyte by means of electrolyte supply system; enabling cutting of the workpiece by the electrolyte so that the electrode can get inside the above cut. Electrochemical production device for implementation of above described method comprises: at least one electrode of continuous closed shape forming through hole and including at least one cam inclined relative to axis of relative axial movement of said electrode of closed shape relative to workpiece; power supply system for said electrode; electrolyte supply system, supplying electrolyte near said electrode to perform said at least one incision; means for moving at least one of said electrode and workpiece, so that electrode is advancing into said cut. Another version of the electrochemical production device for implementing the above electrochemical method comprises: at least one electrode, wherein movement of said electrode and article billet relative to each other is provided; electrode supply system; electrolyte supply system for supplying electrolyte to the electrode; wherein electrode is configured to create cut in workpiece when electrolyte is supplied by electrolyte supply system, so that the cut forms a processed workpiece and at least one extra piece from the workpiece, and the electrode has several segments which are hollow and are connected back to form a hollow electrode of a closed shape. 
     EFFECT: technical result is considerable reduction of power consumption. 
     28 cl, 11 dwg