Patent ID: 7774909
Filing Date: 2010-08-17
Classification: B23B,F22B,Y10T

Abstract:
1. A rotary milling head to cut or break a bond of a heat transfer fin base to a boiler tube, comprising: a milling head base rotatable around a center of rotation extending through a first side and a second side of the base with the first side adapted to be connected to a means of rotation, wherein the second side includes a lower surface of the milling head base that extends transversely relative to the center of rotation of the milling head; a cutting tool with a cutting end and a mounting end; a one and only one cutting tip attached to the cutting end that comprises an arcuate upper cutting surface and a lower cutting surface that intersect at a cutting angle defining a cutting edge which is transverse relative to the center of rotation of the milling head and the cutting tip is oriented to move in the direction of rotation of the milling head base such that the cutting edge leads both the lower cutting surface and the upper cutting surface; and a means to attach the mounting end of the cutting tool to the second side of the milling head base a distance from the center of rotation such that the cutting tip traverses a circular path whose diameter is slightly larger than an outside diameter of the boiler tube when the milling head base is rotated, thereby causing the cutting tip to exert forces on the heat transfer fin base in the direction of rotation of the cutting tip and in the direction toward the milling head base, and wherein a portion of the periphery of the lower surface of the milling head base is not contacted by the cutting tool mounting end.