A cutting element, which is configured for the machining of a non-metallic composite material composed of a matrix and particles held together by the matrix, has a flank face, a rake face and a cutting edge which is coated with an edge coating and via which the flank face and the rake face are connected to one another, with which the non-metallic composite material can be machined in an improved fashion. The cutting edge within a cutting edge section thereof is curved in such a way that the cutting edge immediately beneath the edge coating in a section in a section plane that is perpendicular to the cutting edge has, at every point of the cutting edge section, a local radius of curvature which is greater than or equal to 10 μm and less than or equal to 80 μm.

Positions of both end edges of a weld bead in a bead width direction are measured over the entire circumference of a liner in a circumferential direction of the liner. Based on information on the position of the end edge, bead profile information being information on a shape of the end edge of the weld bead over the entire circumference of the liner in the circumferential direction is created. Based on this bead profile information, machining information of the liner per rotation of the liner being position information of a cutting tool in the bead width direction per phase in the circumferential direction of the liner is created so that a moving locus of the cutting tool relative to the liner along the circumferential direction of the liner approximates the shape of the end edge of the weld bead over the entire circumference of the liner in the circumferential direction.

The present invention belongs to the technical field of machining of fiber-reinforced composites, and relates to a method for measuring distribution of a thrust force during drilling of a unidirectional composite along with a fiber cutting angle. The method includes: cutting the surface a composite sample piece to form a groove; drilling on an existing experimental platform for measuring a thrust force during drilling, where a through hole obtained through the drilling is required to intersect with the groove; obtaining a curve of the thrust force during drilling, comparing the curve with a conventional curve of the thrust force to find a mutation point, and determining the mutation point, namely a fiber cutting angle at the groove; and calculating fluctuation periods of the thrust force according to machining parameters to reckon the distribution of the thrust force along with the fiber cutting angle in all the periods.

A method for machining a workpiece is provided, wherein drilling of the workpiece and subsequent countersinking of the bore, obtained by the drilling, in the workpiece are performed by means of a drilling/countersinking tool in a machining process, wherein the drilling/countersinking tool in the machining process while being axially rotated is subjected to an axial feed movement relative to the workpiece that reaches a counterbore terminal position, and wherein the axial feed movement is superimposed by an axial vibration, wherein, when reaching a predefined frequency lowering position of the axial feed movement by the drilling/countersinking tool, the frequency of the axial vibration is lowered to a final machining frequency, and the machining process is continued at the final machining frequency as the maximum frequency of the axial vibration until the counterbore terminal position is reached.

A method for hole cutting in a workpiece made of CFRP with a cutting tool including at least one cutting edge is provided. Further, a hole cutting assisting apparatus and an apparatus for hole cutting includes a cutting tool, a drive for rotating the cutting tool, and a heating element configured for heating at least a portion of the cutting edge of the cutting tool.

An auxiliary tape for fiber-reinforced composite material processing, having a first adhesive layer having an adhesive force A.sub.1 at 23° C. to a fiber-reinforced composite material of 0.5 N/20 mm or more and an adhesive force A.sub.2 at 90° C. to the fiber-reinforced composite material of 0.1 N/20 mm or more.

The invention concerns a machining tool for machining fiber-reinforced materials such as CFRP, glass-fiber-reinforced plastics or plastics reinforced with polyester threads. The machining tool comprises a plurality of flutes (1, 2, 3, 4) which distance lands (5, 6, 7, 8), disposed about a cylinder core segment (9), from each other in the peripheral sense. At least one of the lands (6, 8) is designed as a premachining land (6, 8) and at least one other of the lands (5, 7) is designed as a postmachining land (5, 7), each comprising a peripheral working region extending along, or with a twist and in the form of a helical segment about, the tool axis. The working region of each premachining land (6, 8) is designed as a peripheral file with a plurality of teeth (10) which are incorporated in a cylinder surface segment-shaped outer surface of the working region, and provided in the working region of each postmachining land (5, 7) is a number of sharp cutting edges (11, 12, 13, 15) extending parallel to or with a twist and in the form of a helical segment about the tool axis. The invention is characterized in that the number of sharp cutting edges (11, 12, 13, 15) on at least one postmachining land (5, 7) comprises a plurality of cutting edges (11, 12) each provided on a peripheral casing groove, the casing grooves being incorporated in a cylinder surface segment-shaped outer face of the working region, parallel to each other and at a pitch relative to the flute (1, 3) leading at least one postmachining land (5, 7).

According to one implementation, a drill has at least one cutting edge. A projected shape of a passing area of a ridgeline of the at least one cutting edge when the at least one cutting edge is rotated around a tool axis becomes a line-symmetric and discontinuous line along a parabola, two parabolas, an ellipse or two ellipses. The projected shape is drawn on a projection plane parallel to the tool axis.

A tool system for machining a workpiece is provided having a cylinder-shaped retaining shank that has a cutting head holder on an end surface facing the workpiece, a drive mount on an end surface facing the drive, a cutting head having at least one cutting edge, a cutting head hub corresponding to the cutting head holder on the retaining shank, a tool coupling with a tool interface, and a coupling hub corresponding to the drive mount. The coupling hub or the cutting head hub have elevated areas, with contact surfaces, distributed in circumferential and longitudinal directions of the coupling hub or the cutting head hub. The contact surfaces make contact on support surfaces on the drive mount or on the cutting head holder on the retaining shank. The drive mount or the cutting head holder is permanently connected to the coupling hub or the cutting head hub by a joining material in intermediate spaces between the elevations.

A drill comprising: a drill main body; a chip discharge flute; and a tip cutting edge. The tip cutting edge includes: a first tip cutting edge which extends toward the axially posterior end as it goes toward the outside in a radial direction; and a second tip cutting edge which is disposed outside the first tip cutting edge in the radial direction. The second tip cutting edge extends toward the tip in the axis direction as it goes toward the outside in the radial direction or extends to be perpendicular to the axis. The radially inner end of the second tip cutting edge is disposed on the axially posterior end with respect to the radially outer end of the first tip cutting edge. The radially outer end of the second tip cutting edge is disposed on a virtual extension line of the first tip cutting edge.