A cutting insert may include a first surface, a second surface, a third surface and a cutting edge. The first surface may include a corner, a first side, a first inclined surface located along the corner, a second inclined surface located further inside than the first inclined surface, a third inclined surface located along the first side, a fourth inclined surface located further inside the first surface than the third inclined surface, and a protruded part located further inside than the second inclined surface and the fourth inclined surface. An inclination angle of the protruded part may be smaller than an inclination angle of the second inclined surface in a cross section along a bisector of the corner. The inclination angle of the protruded part may be larger than a third inclination angle in a cross section orthogonal to the first side.

A cutting tool according to one aspect of the present disclosure includes a substrate and a diamond layer coating the substrate. A cutting tool according to one aspect of the present disclosure includes a rake face, a flank contiguous to the rake face, and a cutting edge configured by a ridge formed by the rake face and the flank. The rake face has a first rake face and a second rake face located between the first rake face and the flank. The second rake face and a surface of the substrate located on the side of the rake face form a negative angle. The second rake face is formed at the diamond layer.

A cutting tool according to one aspect of the present disclosure includes a substrate and a diamond layer coating the substrate. A cutting tool according to one aspect of the present disclosure includes a rake face, a flank contiguous to the rake face, and a cutting edge configured by a ridge formed by the rake face and the flank. The rake face has a first rake face and a second rake face located between the first rake face and the flank. The second rake face and a surface of the substrate located on the side of the rake face form a negative angle. The second rake face is formed at the diamond layer.

A laser assisted micromachining system, includes a working sliding, a tool module, a laser module, and a temperature control module for the processing of a workpiece. The laser module is disposed in the working slide and moves with the working slide in three-dimensional space. The temperature control module includes a temperature sensor, a cooler, a controller and a coolant, which detects the real-time temperature value of the cooler. The cooler is located in the working slide and supports the tool module. The controller controls the working state of the cooler according to the temperature feedback. Control signal induced by the temperature indicator, and the working state of the cooler are controlled by the controller. The coolant is used to control the temperature distribution of the cooler in the setting range. At the same time, the invention also provides a temperature control method for the laser assisted micro machining system.

A sintered body includes cubic boron nitride grains as hard phase grains, and has a thermal conductivity of not less than 15 W.Math.m.sup.1.Math.K.sup.1 and not more than 40 W.Math.m.sup.1.Math.K.sup.1, for cutting a nickel-based heat-resistant alloy formed of crystal grains having a fine grain size represented by a grain size number of more than 5 defined by ASTM standard E112-13. A cutting tool includes this sintered body. Accordingly, the sintered body having both high wear resistance and high fracture resistance, as well as the cutting tool including the sintered body are provided.

A sintered body includes cubic boron nitride grains as hard phase grains, and has a thermal conductivity of not less than 15 W.Math.m.sup.1.Math.K.sup.1 and not more than 40 W.Math.m.sup.1.Math.K.sup.1, for cutting a nickel-based heat-resistant alloy formed of crystal grains having a fine grain size represented by a grain size number of more than 5 defined by ASTM standard E112-13. A cutting tool includes this sintered body. Accordingly, the sintered body having both high wear resistance and high fracture resistance, as well as the cutting tool including the sintered body are provided.

A sintered body includes cubic boron nitride grains as hard phase grains, and has a thermal conductivity of less than 20 W.Math.m.sup.1.Math.K.sup.1, for cutting a nickel-based heat-resistant alloy formed of crystal grains having a coarse grain size represented by a grain size number of 5 or less defined by ASTM standard E112-13. A cutting tool includes this sintered body. Accordingly, the sintered body having high fracture resistance in addition to high wear resistance, as well as the cutting tool including the sintered body are provided.

A sintered body includes cubic boron nitride grains as hard phase grains, and has a thermal conductivity of less than 20 W.Math.m.sup.1.Math.K.sup.1, for cutting a nickel-based heat-resistant alloy formed of crystal grains having a coarse grain size represented by a grain size number of 5 or less defined by ASTM standard E112-13. A cutting tool includes this sintered body. Accordingly, the sintered body having high fracture resistance in addition to high wear resistance, as well as the cutting tool including the sintered body are provided.

A method for manufacturing a member according to one embodiment of the present disclosure is a method for manufacturing a member having a substrate and a sprayed coating formed on a surface of the substrate. The method includes: supplying an oil into a recessed portion of the sprayed coating, a kinematic viscosity of the oil at 40 C. being more than or equal to 3 mm.sup.2/s and less than or equal to 43 mm.sup.2/s; and dry-cutting, using a cutting tool, a surface of the sprayed coating with the recessed portion supplied with the oil. A supplied amount of the oil is more than or equal to 0.1 weight % and less than or equal to 2.7 weight % with respect to an apparent weight of the sprayed coating.

A method for manufacturing a member according to one embodiment of the present disclosure is a method for manufacturing a member having a substrate and a sprayed coating formed on a surface of the substrate. The method includes: supplying an oil into a recessed portion of the sprayed coating, a kinematic viscosity of the oil at 40 C. being more than or equal to 3 mm.sup.2/s and less than or equal to 43 mm.sup.2/s; and dry-cutting, using a cutting tool, a surface of the sprayed coating with the recessed portion supplied with the oil. A supplied amount of the oil is more than or equal to 0.1 weight % and less than or equal to 2.7 weight % with respect to an apparent weight of the sprayed coating.