Patent ID: 7841812
Filing Date: 2010-11-30
Classification: B23B,B23C,Y10S,Y10T

Abstract:
1. A countersinking tool for finishing an existing hole in a workpiece to form a sealing seat, said countersinking tool comprising: a tool base body having a central, longitudinal axis of rotation; said tool base body comprising a shank being configured and disposed to be secured in a machine tool during operation and being configured and disposed to be set in a rotational motion about its central axis of rotation by a spindle; two front cutting inserts being configured and disposed to enlarge a diameter of a portion of a hole to a desired dimension; two rear cutting inserts being disposed axially set back from said two front cutting inserts along said longitudinal axis of said tool base body; said two rear cutting inserts being configured and disposed to further enlarge the diameter of the hole in a portion of the hole beyond the diameter of the hole formed by said two front cutting inserts; each of said cutting inserts being fastened to said tool base body by a clamping screw; said front cutting inserts being disposed on a front face of said tool base body and being disposed approximately 180° apart with respect to one another; said rear cutting inserts being disposed on said tool base body a distance away from said front face of said tool base body substantially along the longitudinal axis of said tool base body; said rear cutting inserts being disposed approximately 180° apart with respect to one another; said rear cutting inserts being disposed within a common chip space being shared with said front cutting inserts; each of said front cutting inserts and each of said rear cutting inserts comprising a cutting corner and a corresponding cutting side; each of said cutting corners being oriented toward its corresponding cutting side; each of said cutting sides being disposed on the periphery of said countersinking tool; each of said cutting corners being configured and disposed to engage a workpiece during machining; said cutting corners of said front cutting inserts and said cutting corners of said rear cutting inserts being disposed in different radial positions with respect to each other; said rear cutting inserts being larger than said front cutting inserts; said rear cutting inserts being configured and disposed to cut a larger hole circumference than said front cutting inserts to form a hole in said workpiece having a step which is configured to have a sealing element inserted thereon; said tool base body comprising insert seats being configured to receive each of said front cutting inserts and said rear cutting inserts; each of said insert seats comprising: said front cutting insert seats comprising one lateral bearing wall and said front cutting insert seats being substantially open toward said front face of said tool base body; said rear cutting insert seats comprising two lateral bearing walls being substantially perpendicular to the longitudinal axis of said tool base body; said rear bearing wall of each of said rear cutting insert seats comprising a resiliently held web; each of said webs being a plate-like element and being connected to said tool base body on a fastening side only by a connection web portion; said tool base body comprising expanding slots being configured to separate a longitudinal side of said webs from said tool base body; adjusting screws being configured to be inserted into each of said expanding slots for fine adjustment of the radial position of each of said rear cutting inserts; each of said expanding slots comprising: