Kennametal Widia Produktions Gmbh & Co Kg

Kennametal Inc.

Jürgen Bär

Markus Heinloth

Carsten Schwaner

Martin Hausmann

Helmut Klein

Ralf Klötzer

Jochen Hecht

The invention relates to a method and a device for the precision machining of crankshafts or camshafts to final size tolerances R&#x3c;10 &#x3bc;m, preferably &#x2266;5 &#x3bc;m and concentricity tolerances&#x2266;30 &#x3bc;M, preferably 6 &#x3bc;m. The crankshafts or camshafts has been machined by a cutting operation and at least partly subjected to hardening. According to the invention, after an initial cutting operation and subsequent hardening to 45 to 60 HRC, preferably 50 to 53 HRC, a final cutting operation is carried out using cutting inserts fitted with CBN or PCD inlets. The device used for this purpose has cutting inserts which are fitted with CBN or PCD inlets, wherein cutting inserts clamped in place laterally, radially and tangentially follow each other alternately.

Method and device for the precision machining of crankshafts and camshafts

The invention relates to a cutting insert () with a base, having a supporting surface, a covering surface, at a distance therefrom and side faces (), connecting said surfaces, whereby two or several adjacent surfaces form cutting edges (). According to said invention, the supporting surface is connected in a non-detachable manner to a supporting surface of a cutting plate (), the geometry of which is different from the cutting insert () and suitable for another metal cutting operation.

Cutting insert, in particular, for crankshaft machining

The invention relates to a cutting insert having an essentially parallelepiped-shaped basic body with two larger spaced-apart longitudinal surfaces () which are connected to one another by two smaller transverse surfaces () and two smaller longitudinal surfaces () designed as rake faces, wherein the smaller longitudinal surfaces () form with the adjacent surfaces a respective, encircling, closed cutting line which forms the cutting edges and rounded-off cutting corners, and the larger longitudinal surface () merges on both sides via respective rounded-off edges into the smaller transverse surface (), and one of the rounded-off cutting corners is designed so as to project relative to a basic shape which is determined by the cutting lines, on both sides, of the larger longitudinal surfaces () with the smaller longitudinal surfaces ().

Cutting insert and milling cutter

The invention relates to a cutting insert for clamping into a disc-type or strip-shaped tool body, in particular, for milling crankshafts, whereby the insert is substantially cuboid-shaped and has two front faces, two side faces, serving as cutting faces as well as an upper and a lower side face, whereby a convex face is arranged between the front faces and the upper and lower side faces, so that the upper and lower side faces and the convex face form cutting edges each with a side face. According to invention, the cutting insert has an inwardly-tapered face adjoining the convex face, which allows the cutting edge to protrude and tapered chamfers are provided between the inwardly-tapered faces of the front face on both sides of a planar supporting surface to the outer edge.

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Fürth, Germany

Jürgen Bär