Cutting insert
AssigneeSantrade Ltd.
InventorLars O. Markusson
Life of this patent
Estimating the term…
Abstract
The invention relates to an indexable cutting insert having a polygonal basic shape for chip forming machining, preferably for milling. The insert comprises an upper face and a lower face and edge surfaces connecting them. Each corner portion of the insert comprises a plurality of chamfers arranged at the transition between the connected edge surfaces, a first chamfer of which forms a minor cutting edge at the line of intersection with the upper face. At least two further planar, second chamfers are arranged between the first chamfer and the associated edge surface, said second chamfers forming an obtuseinternal angle with each other and forming cutting edges with the upper face and therefore the cut chip avoids compressing and avoids a quick destruction of the corner portions of the insert.
Claims9
A cutting insert for chip forming machining having a polygonal basic shape, comprising two mainly parallel faces and edge surfaces joining them, lines of intersection between two of said edge surfaces and at least one of said faces forming main cutting edges and a plurality of chamfers being formed at the transition between two of said edge surfaces in a cormer portion of the insert, a first of said chamfers forming a minor cutting edge at its line of intersection with said face, said cormer portion having a bisector, characterized in that the transition between the minor cutting edge and the associated main cutting edge in the corner portion of the insert comprises at least two straight cutting edges which form an obtuse internal angle with each other, said main cutting edge being essentially longer than the associated minor cutting edge, the major part of said minor cutting edge being placed at one side of said bisector and the major part of the cutting edges of the second chamfers along intersection lines with said face being arranged at the opposite side of said bisector and in that the main cutting edge extends from a cutting edge of a second chamfer to a minor cutting edge at an adjacent corner portion and in that at least two maximum four second chamfers are formed between the first chamfer and the associated edge surface.
Dependencies are inferred from the claim text.