Cutting tool insert
AssigneeSandvik Intellectual Property AB
InventorAnders Jonsson
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Abstract
The present invention relates to a cutting tool insert for metal machining comprising a substrate with a first coating and an outermost PVD-layer. The insert further comprises clearance faces and rake faces intersecting to form cutting edges having essentially no edge radius. The first coating has been removed so that the outermost PVD-layer is the only layer on the clearance face at least close to the cutting edge. The present invention also relates to a method of making such an insert. The inserts according to the present invention gives an increased tool life.
Claims14
Cutting tool insert for metal machining comprising a substrate with a first coating comprising one or more alumina layers and an outermost PVD-layer, said insert further comprising clearance faces and rake faces intersecting to form cutting edges having essentially no edge radius, wherein the one or more alumina layers has been removed so that the outermost PVD-layer is the only layer on the clearance face at least close to the cutting edge.
Method of making a cutting tool insert for metal machining comprising a substrate with a first coating and an outermost PVD-layer, said insert further comprising clearance faces and rake faces intersecting to form cutting edges, comprising the steps of:
- providing a cutting tool insert with a first coating comprising one or more alumina layers,
- subjecting at least the rake face of said insert to a blasting operation to obtain a smooth surface with a surface roughness (Ra) of less than 0.3 μm over a measured length of 0.25 mm and
- subjecting the insert to a peripheral grinding operation, either around the cutting edge or on the whole clearance side, with a fine grinding wheel to obtain a cutting edge with essentially no edge radius and removing said first coating from the clearance side at least close to the cutting edge, and
- depositing on at least a portion of the clearance side from which the first coating has been removed an outermost wear resistant layer using PVD-technique.
Dependencies are inferred from the claim text.