Patent ID: 6416283
Filing Date: 2002-07-09
Classification: B23H,F05B

Abstract:
A process for forming interrupted raised projections and grooves therebetween perimetrically about an interior surface of a preformed elongated hole in a workpiece, comprising the steps of:(a) locating within the hole an electrode having an electric insulating material arranged in axially spaced, perimetrically extending rows, interrupted by at least one gap, forming a pattern of insulated and non-insulated portions of the electrode about an outer surface of the electrode in general opposition to intended locations of the projections and grooves, respectively, about the interior surface of the hole; (b) flowing an electrolyte between said electrode and the interior surface of the hole of the workpiece; and (c) passing an electric current between the electrode and the workpiece to form the perimetrically interrupted axially spaced rows of projections and grooves along the interior surface of the hole.