An indexable drill insert includes a drill body having a central longitudinal rotational axis (CL), the drill body comprising a shank portion and a fluted cutting portion, the fluted cutting portion having a front clearance face and a plurality of flutes, the fluted cutting portion includes a central insert pocket capable of receiving a central cutting insert and a peripheral insert pocket capable of receiving a peripheral cutting insert. For the central cutting insert, a central, longitudinal axis of a projection of the flute coolant exit aperture can intersect a vertical plane (PA1) having an area (A1) or a horizontal plane (PB1) having an area (A2). For the peripheral cutting insert, the central, longitudinal axis of the projection can intersect a vertical plane (PA2) having an area (A3) or a horizontal plane (PB2) having an area (A4).

In an indexable drill, a cutting insert having a cutting edge is detachably mounted on an insert mounting seat of a drill main body. The insert mounting seat has a bottom surface facing a tip side of a drill main body, and a wall surface extending to the tip side and facing a drill rotation direction. The cutting insert has a seating surface seated on the bottom surface toward a rear end side of the drill main body, a contact surface coming into contact with the wall surface toward a side opposite to the drill rotation direction, a projection portion projecting to the side opposite to the drill rotation direction on a tip side of the contact surface, and a mounting hole penetrating the seating surface from a tip flank.

A metal cutting indexable drill tool includes a drill body having a boring shaft. A center drill insert is mounted at a distal end of the boring shaft. A drill flute of the boring shaft is configured to direct and form a chip from the center drill insert, wherein the drill flute has a chip forming surface at a distal end thereof. The chip forming surface is arranged at a distance from a peripheral corner of the center drill insert to a point on a curve formed by the intersection of the chip forming surface and an imaginary inscribed sphere. The radius of the imaginary inscribed sphere, defined by the peripheral corner and the distance divided with the diameter of the drill tool is equal to a chip parameter A, which is indicative of the chip diameter to boring diameter ratio, wherein A is 0.3≤A≤0.5.

The present invention provides a cutting insert with a lip support providing additional support for the cutting insert. The cutting insert may be secured to a pocket of a drilling tool. The cutting insert may include a front surface, rear surface, and side surfaces. Cutting edges may form at the intersection of the side surfaces and the front surface. A cutting lip may extend rearwardly from the cutting edges with a seating surface under the cutting lip. The transition between the seating surface and the cutting lip may include two chamfers separated by a lip support.

Drilling tool systems including a drilling body and a drilling inserts are disclosed. The drilling inserts include four indexable cutting edges. The four cutting edges may each comprise a plurality of cutting edge segments and a wiper edge. The plurality of cutting edge segments and the wiper edge are provided at distinct angles to provide effective chip breaking and a stronger cutting edge at the drilling insert corners. Furthermore, the side surfaces of the drilling inserts allow the drilling insert to be more stably supported in a pocket of the drilling body. The drilling inserts may be used in a peripheral pocket of a drilling body.

An indexable drilling tool, includes a cutter body, an outer blade and an inner blade. The inner blade is surrounded by a first upper surface, a first lower surface and a first side surface. The first upper surface intersects with the first side surface to form multiple identical inner cutting edges. When drilling, a cutting area of the inner cutting edge as a main cutting edge is located between a central inner point and a central outer point on the inner cutting edge. In a feed direction, an inner convex cutting portion with a maximum cutting depth is arranged between the central inner point and the central outer point. Distances between the central inner point and the inner convex cutting portion and between the central outer point and the inner convex cutting portion in an axial direction are H1 and H2 respectively, which meets the following requirement: 0.9H2≤H1≤1.1H2.

Drilling tool systems including a drilling body and a drilling inserts are disclosed. The drilling inserts include four indexable cutting edges. The four cutting edges may each comprise a plurality of cutting edge segments and a wiper edge. The plurality of cutting edge segments and the wiper edge are provided at distinct angles to provide effective chip breaking and a stronger cutting edge at the drilling insert corners. Furthermore, the side surfaces of the drilling inserts allow the drilling insert to be more stably supported in a pocket of the drilling body. The drilling inserts may be used in a peripheral pocket of a drilling body.

Drilling tool systems including a drilling body and a drilling inserts are disclosed. The drilling inserts include four indexable cutting edges. The four cutting edges may each comprise a plurality of cutting edge segments. The plurality of cutting edge segments are provided at distinct angles with respect to a reference plane of the drilling insert to provide effective chip breaking and a stronger cutting edge at the drilling insert corners. Furthermore, the side surfaces of the drilling inserts allow the drilling insert to be more stably supported in a pocket of the drilling body. The drilling inserts may be used in a central pocket of a drilling body.

The subject invention is directed to metal working operations and, more particularly, to machining heat resistant super alloys (HRSAs) such as titanium alloys with polycrystalline diamond cutting inserts sintered on a carbide substrate. Using at least one cutting insert mounted upon a rotary toolholder and wherein the at least one cutting insert has a substrate with a top layer of PCD secured thereto over no less than 1/3 of a substrate top surface, a method of machining heat resistant super alloys (HRSAs) is made up of the steps of rotating the rotary toolholder such that an insert surface speed rate is above 50 meters per minute and adjusting a tool feed rate (advance per tooth per revolution) and/or radial engagement of the toolholder such that the machining operation produces chips having a thickness of approximately 0.050-0.200 millimeters.

An insert according to an embodiment includes an upper surface including a corner part, a lower surface, a side surface, and a cutting edge. The cutting edge includes a first cutting edge located at the corner part, a second cutting edge adjacent to the first cutting edge, a third cutting edge adjacent to the second cutting edge, and a fourth cutting edge adjacent to the third cutting edge. Each of the third cutting edge and the fourth cutting edge has a concave curvilinear shape extending downward in a side view. A radius of curvature of the fourth cutting edge is smaller than a radius of curvature of the third cutting edge.