Patent ID: 6018976
Filing Date: 2000-02-01
Classification: B21K

Abstract:
A process for tightly closing an inner bore (11) in a work piece (10) comprising a ductile material, the steps comprising positioning an end of a male die (13) upon a mouth (15) of the inner bore of the work piece at a position (a) with an axis of said die (13) off-set with an axis of the bore,positively moving the male die in an axial direction of the inner bore (11) thereby forcing a first portion of the inner bore of the ductile material across a diameter of said bore,removing said die (13) from the bore and moving said die diametrically so that the axis of the die is off-set with respect to the axis of the bore (11) with a portion of the end of the die juxtaposed a position (b) of the mouth,positively moving the male die for a second time in an axial direction of said inner bore (11) thereby forcing a second portion of said inner bore of said ductile material across a portion of said bore (11) complemented with said first portion, andremoving the die from the bore, whereby said first and second portions of said inner bore that are displaced by said die closes said inner bore (11).