Patent ID: 6186705
Filing Date: 2001-02-13
Classification: B23B,B23C,Y10T

Abstract:
A cutting insert comprising:a block of hard metal cutting material havinga first major plane face, having a depressed edge portion which constitutes a rake surface,a second major plane face parallel to said first-mentioned major face and defining a seating surface for said insert, anda minor face intersecting both major faces to define a cutting edge along said rake surface and a clearance face extending from said cutting edge to said seating surface,said rake surface sloping inwardly from said cutting edge toward said seating surface to make a positive rake angle with respect to said seating surface,said rake surface receding from said cutting edge to a ledge on said block rising above said rake surface and cutting edge as an uninterrupted barrier parallel to said cutting edge,said rake surface having therein a series of spaced depressions along and adjacent to said cutting edge and shaped to increase said positive rake angle within said depressions,said depressions extending away from said cutting edge toward said ledge for a major portion of the rake surface and each providing an upwardly sloped surface therein remote from said cutting edge and terminating in front of said ledge,said ledge receding upwardly and rearwardly from said rake surface so as to deflect a chip of rigidity sufficient to override said depressions,the height of said ledge relative to said cutting edge being at least as great as the depth of said depressions relative to said edge.