Cutting tool
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United States of America Patent
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Apr 17, 2018
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app pub date -
Dec 26, 2011
filing date -
Dec 25, 2010
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Abstract
A cutting tool composed of a sintered cermet body is disclosed. The body includes hard phases composed of carbide(s), nitride(s), and carbonitride(s) of metal(s) selected from metals belonging to Groups 4, 5, and 6 of the periodic table including Ti as a main component, and includes first and second hard phases, and a binding phase mainly composed of at least one of Co and Ni. The body includes first and second faces, a cutting edge located at an edge of the first and second faces, and an interior portion located at a depth of 400 μm or more from the first face. When residual stresses are measured by a 2D method, stress of the first hard phase is 80 MPa or more in terms of compressive stress. Stresses of the second hard phase and the binding phase are −50 MPa to 50 Mpa in terms of compressive or tensile stress.
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