Patent ID: 6946062

Claim:
An electropolishing device for electropolishing an inner surface of a long tube comprising: a) a fixed magnet mechanism having a plurality of fixed magnets, each of the plurality of fixed magnets positioned with a long side parallel with an axis of the long tube; b) first and second partitions located such that the fixed magnet mechanism is located between and axially aligned with the first and the second partitions; c) a cable connected to a first power supply; d) at least one electrode connected at a first end to the cable and at a second end to the first partition, the at least one electrode located in an interior of the long tube, the cable providing a direct current to the at least one electrode; e) a driving apparatus connected to a second power supply and having a plurality of outer electromagnets positioned around an outer periphery of the tube, the plurality of outer magnets generating an electromagnetic force that positions the fixed magnet mechanism within the tube and rotates the fixed magnet mechanism and the first and the second partitions on the axis of the tube; f) an axial driven mechanism moves the driving apparatus along the axis of the tube, the axial movement of the driving apparatus and the rotation of the fixed magnet mechanism and the first and the second partitions are performed simultaneously, such that a flow of an electrolyte and the movement of the electrode through the tube electropolishes the inner surface of the long tube; and g) a screw structure connected to the second partition opposite the fixed magnet mechanism.