Patent ID: 7497361
Filing Date: 2009-03-03
Classification: B23D,F16C,Y10T

Abstract:
1. A process for the fracture separation of a part having a cylindrical bore passing therethrough into a first portion and a second portion, the cylindrical bore having a central axis, the part having two opposed sides proximate to the intersection of a predetermined fracture plane passing through the cylindrical bore and the part, the process including the step of applying at least one fatigue force to at least one of the first portion and the second portion, said at least one fatigue force being applied to fracture the part into the first portion and the second portion so as to separate the first portion from the second portion substantially along said predetermined fracture plane, said at least one fatigue force being selected from the group consisting of: i) a longitudinal cyclic force applied to one of the first portion and the second portion relative to the other of the first portion and the second portion, said longitudinal cyclic force being applied in a direction substantially perpendicular to said predetermined fracture plane, and ii) a lateral cyclic force applied to each of the opposed sides of the part, each of said lateral cyclic forces being applied along a substantially straight line that is substantially parallel to the predetermined fracture plane and substantially perpendicular to the central axis, where at any time instant, each of said lateral cyclic forces being substantially equal in magnitude and acting opposite in direction to one another; and applying a dynamic force to one of the first portion and the second portion relative to the other of the first portion and the second portion in a direction substantially perpendicular to said predetermined fracture plane.