Coated cutting tool and method for manufacturing the same
AssigneeSandvik Intellectual Property AB
InventorCarl Bjormander
Life of this patent
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Abstract
A coated cutting tool includes a substrate with a rake side, a clearance side and a cutting edge, and a coating including a first layer and a second layer. The second layer includes an inner layer and an outer layer, wherein the first layer is exposed through an opening in the inner layer and the opening extends over at least a portion of the width of the cutting edge. Thereby, a double layer is provided in critical areas, whereas a single layer is provided in other areas. Preferably, the double oxide layer includes aluminum oxide layers. A method for manufacturing the coated cutting tool is also provided.
Claims18
A coated cutting tool comprising:
- a substrate with a rake side, a clearance side and a cutting edge with an edge rounding described by an inscribed ellipse with a first axis along the rake side of W and a second axis along the clearance side of H at the intersection of the rake side and the clearance side;
- and
- a coating with a thickness T comprising a first layer and a second layer deposited on the first layer, wherein the second layer comprises a sandwich structure of an inner layer and an outer layer, wherein the inner layer has an opening to the first layer that extends over at least a portion of the width of the cutting edge and along at least a portion of the cutting edge in the orthogonal direction and the outer layer covers at least the opening and a portion of the inner layer.
A method of manufacturing a substrate with a rake side, a clearance side and a cutting edge at the intersection of the rake side and the clearance side, and a coating comprising an first layer and an second layer deposited on the first layer, wherein the method comprises the steps of:
- depositing the first layer on a surface area extending over each of the rake side, the clearance side and the cutting edge;
- depositing an inner layer on the surface area covered by the first layer;
- selectively removing the inner layer by lift-off, wherein the inner layer is exposed to laser light arranged to irradiate the first layer through the inner layer and being absorbed by the first layer, thereby exposing the first layer through an opening in the inner layer, wherein said opening extends over at least a portion of the width of the cutting edge and along at least a portion of the cutting edge in the orthogonal direction;
- and
- depositing an outer layer that covers at least the opening and a portion of the inner layer.
Dependencies are inferred from the claim text.