There is provided a cutting insert used for both drilling and turning. The cutting insert includes an insert main body having a front surface and a rear surface, the outline shapes of which are parallelogram shapes, peripheral side surfaces disposed on four sides of the insert main body, cutting edges provided on respective intersecting ridge lines between the front surface and the peripheral side surface and between the rear surface and the peripheral side surface of the insert main body, and a hole provided in the insert main body to incline with respect to the front surface and the rear surface, the hole being usable for attachment.

A cutting tool includes a cutting insert resiliently clamped in an insert holder. The insert holder includes a forwardly located insert mounting portion that includes an insert receiving recess which extends along a recess axis. The insert holder includes a fastening member through hole opening out to the insert receiving recess. The insert receiving recess includes an insert orientation projection. The fastening member through hole has a through hole angular extent about the recess axis. The insert orientation projection has an insert orientation projection angular extent about the recess axis. The insert orientation projection angular extent at least partially angularly overlaps the through hole angular extent about the recess axis.

A square-shaped bar-peeling insert and insert-holder designed with pockets to hold two such square-shaped inserts. Each insert has four peripheral sub-surfaces and corners. Between each adjacent pair of corners is a cutting edge which includes a straight wiper sub-edge and two at least partially curved peeling sub-edges respectively located on opposing sides of the wiper sub-edge. The corners of the insert are inwardly disposed relative to an imaginary square formed by the sub-edges.

A cutting crown fixing for positively locking and non-rotatable fixing of a cutting crown to a holder associated therewith of a comminuting apparatus, in particular a rotor of a comminuting apparatus, including a cutting crown, a cutting crown holder associated with the cutting crown, a screw bolt and a thread insert having a head portion and a shaft portion, wherein the thread insert has a female thread complementary to the male thread of the screw bolt and the cutting crown holder has a through passage for receiving the screw bolt, and in the installed position the thread insert is arranged in positively locking relationship in the axial and tangential direction in a holding opening of the cutting crown associated therewith. The cutting crown holder according to the invention is distinguished in that the positively locking configuration of a peripheral surface of the thread insert relative to the holding opening of the associated cutting crown extends over the entire longitudinal extent of the thread insert, wherein the thread insert is of a rotationally symmetrical configuration over the longitudinal extent of the head portion for providing an axial positively locking relationship with the holding opening and at least over a longitudinal portion has a conical peripheral surface which in the installed position corresponds to a conical receiving portion of complementary configuration of the holding opening and the thread insert in the region of the longitudinal extent of the shaft portion is of a non-rotationally symmetrical configuration for providing a rotational positively locking relationship with the holding opening.

A double-sided cutting insert with orientation-assisting geometry includes identical and opposite first and second main surfaces and a peripheral surface which extends therebetween. The insert further includes a median plane located midway between the first and second main surfaces and opposite first and second clamping recesses opening out respectively to the first and second main surfaces. Projections onto the median plane of at least portions of the first and second clamping recesses are rotationally offset from one another about a central axis.

A turning insert includes a top surface, an opposite bottom surface, a side surface connecting the top and bottom surfaces, and a cutting edge formed at an intersection between the top surface and the side surface. The cutting edge including a corner cutting edge, a first cutting edge, and a second cutting edge. The top surface having a first surface in the form of a depression, which borders at least a major portion of the corner cutting edge. The first and the second cutting edges subtending an angle θ which is 75-85°. At least a part of the corner cutting edge is concave in a front view.

A square-shaped bar-peeling insert and insert-holder designed with pockets to hold two such square-shaped inserts. Each insert has four peripheral sub-surfaces and corners. Between each adjacent pair of corners is a cutting edge which includes a straight wiper sub-edge and two at least partially curved peeling sub-edges respectively located on opposing sides of the wiper sub-edge. The corners of the insert are inwardly disposed relative to an imaginary square formed by the sub-edges.

A cutting insert is provided, which can be prevented from being lifted from a tool body. A cutting insert includes two end surfaces opposed to each other, a peripheral side surface extending between the two end surfaces, a cutting edge provided at an intersecting edge between at least one of the two end surfaces and the peripheral side surface, and a fixing hole provided in an end surface direction from the first end surface to the second end surface. The peripheral side surface is provided with raised parts changing in height in the end surface direction.

Provided is an external cooling texture turning tool component and a turning process system for coupling nanofluid minimum quantity lubricant with a micro-texture tool. The external cooling texture turning tool component comprises an external cooling turning tool handle and an external cooling turning tool blade; the external cooling turning tool blade is arranged at one end of the external cooling turning tool handle serving as a bearing device; an external cooling turning tool pad is arranged between the external cooling turning tool blade and a structure of the external cooling turning tool handle bearing the blade; an external cooling turning tool pressing plate part is further arranged on the external cooling turning tool handle; the external cooling turning tool blade is tightly pressed on the external cooling turning tool handle by the external cooling turning tool pressing plate part.

A tangential cutting insert for a turning tool is described, which comprises a first tangential cutting insert side and a second tangential cutting insert side, wherein one of the tangential cutting insert sides is assigned more than two cutting edges, and the cutting edges are arranged in a star shape about a tangential cutting insert center axis. The tangential cutting insert is produced completely from cubic crystalline boron nitride, polycrystalline cubic boron nitride, polycrystalline diamond, or ceramic. In addition, a cutting tool with such a tangential cutting insert is presented. A method for producing a tangential cutting insert is also explained.