AB Sandvik Coromant

The present invention relates to a coated cutting tool including a substrate at least partially coated with a coating. The coating includes a layer of Ti(C,N), a layer of α-Al 2 O 3 and therebetween a bonding layer. The Ti(C,N) layer has a thickness of 3-20 μm and includes an inner Ti(C,N) portion, T1, followed by an outer Ti(C,N) portion, T2, as seen in a direction from the substrate towards the outer surface of the tool. The thickness of the inner portion T1 is 2.5-15 μm and the thickness of the outer portion T2 is 0.5-5 μm. The average grain width of the Ti(C,N) grains in T1 and in T2 is smaller than 300 nm. The atomic ratio C/N in the inner Ti(C,N) portion, T1, is 1.50-1.60, and the atomic ratio C/N in the outer Ti(C,N) portion, T2, is 1.25-1.40.

A machining system includes a machine tool having a sensor, a cutting tool having a tool body arranged at the machine tool, and a control system arranged for controlling and monitoring the position of the tool body. A method for determining a position of a point on a machined surface of a workpiece includes machining the workpiece using the cutting tool and measuring the workpiece using a measurement tool including the tool body and a first tip. Measuring the workpiece includes moving the measurement tool towards the workpiece while measuring a parameter using the sensor, and determining, based on a position of the tool body monitored by the control system and on values of the parameter as measured by the sensor, a first position of the first tip when the tip touches the point on the machined surface, thereby indicating the position of the point on the machined surface.

A method of treating a coated cutting tool using laser shockpeening (LSP) is provided. The coated cutting tool includes a substrate and a coating, wherein the substrate is of cemented carbide or cermet. The coating includes a CVD layer and/or a PVD layer. The method includes the step of applying LSP to at least a portion of the cutting tool, wherein the LSP energy density is within 0.4 to 1.6 J/mm 2 and wherein the LSP applies laser pulses to the at least one portion of the cutting tool.

A coated cutting tool has a CVD coating and a substrate of a cemented carbide, wherein the metallic binder in the cemented carbide includes Ni. The CVD coating has an inner layer of TiN and a subsequent layer of TiCN. A C-activity relative to graphite in the metallic binder is lower than 0.15 and an average d electron value of the metallic binder is 7.00-7.43, wherein an interface between the substrate and the inner TiN layer is free of Ti-containing intermetallic phase.

A coated cutting tool having a substrate and a coating is provided. The coating includes an inner α-Al 2 O 3 -multilayer and an outer α-Al 2 O 3 -single-layer. The thickness of the inner α-Al 2 O 3 -multilayer is less than or equal to 35% of the sum of the thickness of the inner α-Al 2 O 3 -multilayer and the thickness of the outer α-Al 2 O 3 -single-layer. The sum of the thickness of the inner α-Al 2 O 3 -multilayer and the outer α-Al 2 O 3 -single-layer is 2-15 μm. The inner α-Al 2 O 3 -multilayer consists of alternating sublayers of α-Al 2 O 3 and sublayers of TiCO, TiCNO, AlTiCO or AlTiCNO. The inner α-Al 2 O 3 -multilayer can include at least 5 sublayers of α-Al 2 O 3 .

A method of treating a coated cutting tool using laser shockpeening (LSP) is provided. The coated cutting tool includes a substrate and a coating, wherein the substrate is of cemented carbide or cermet. The coating includes a CVD layer and/or a PVD layer. The method includes the step of applying LSP to at least a portion of the cutting tool, wherein the LSP energy density is within 0.4 to 1.6 J/mm 2 and wherein the LSP applies laser pulses to the at least one portion of the cutting tool.