Eight-edged cutting insert, and tool holder for same
AssigneeKennametal Inc.
InventorsRudi Hartlohner, Igor Kaufmann
Life of this patent
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Abstract
The invention relates to an eight-edged rotatable and reversible cutting insert having two opposite, substantially square base surfaces which are twisted relative to one another about a central axis running perpendicularly to said base surfaces, and having four identical side surfaces, wherein a main lip is formed between each base surface and each side surface. A bearing surface is formed between two chip grooves which extend along the associated main lip of the respective side surface, said bearing surface extending symmetrically beyond the groove ends of the adjacent chip groove and transversely to the main lips until its adjoins the latter.
Claims19
An eight-edged rotatable and reversible cutting insert comprising two opposite, substantially square base surfaces which are twisted relative to one another about a central axis running perpendicularly to said base surfaces, and having four identical side surfaces, wherein a main lip is formed between each base surface and each side surface, wherein:
- a) each side surface has two diagonally opposite corner edges which form a secondary lip adjacent to the respective main lip,
- b) each side surface has two chip grooves which, starting from the respective corner edge, extend along the associated main lip up to a rear groove end, and
- c) a bearing surface is formed between the chip grooves, said bearing surface extending symmetrically beyond the groove ends of the adjacent chip groove and transversely to the main lips until it adjoins the latter.
A tool holder having an eight-sided rotatable and reversible cutting insert, wherein the cutting insert has two opposite, substantially square base surfaces which are twisted relative to one another about a central axis running perpendicularly to said base surfaces, and having four identical side surfaces, wherein a main lip is formed between each base surface and each side surface, wherein:
- a) each side surface has two diagonally opposite corner edges which form a secondary lip adjacent to the respective main lip,
- b) each side surface has two chip grooves which, starting from the respective corner edge, extend along the associated main lip up to a rear groove end, and
- c) a bearing surface is formed between the chip grooves, said bearing surface extending symmetrically beyond the groove ends of the adjacent chip groove and transversely to the main lips until it adjoins the latter.
Dependencies are inferred from the claim text.