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Abstract

A method and apparatus for electric-discharge texturing (EDT) ends of a roll rotatably supported about a roll axis uses electrodes mounted on a head. The head is movable in a direction parallel to the roll axis. The electrodes are movable in a direction transverse to the roll axis to maintain a desired spacing with respect to the surface of the roll. Each of the electrodes is positioned at a sparking position along the direction transverse to the roll axis to effect sparking with the surface of the roll. The head is moved in a direction from the center portion of the roll towards the first end of the roll along the direction parallel to the roll axis such that each of the electrodes traverse across the surface of the first end of the roll. Each of the electrodes is then positioned at a retracted position along the direction transverse to the roll axis as each of the electrodes passes off the first end of the roll. The head is then moved back in a direction from the first end towards the second end after all of the electrodes have traversed across the surface of the first end of the roll such that each of the electrodes traverse across the surfaces of the first end and the center portion of the roll. The process is then repeated at the second end. Because each of the electrodes traverse across the surface of the roll, the roll profile deformation across the roll is consistent.

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