Method and milling cutter for machining hardened crankshafts or camshafts
AssigneeKennametal Inc.
InventorsMarkus Heinloth, Juergen Thomas Baer
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Abstract
The invention relates to a method for precision machining of crankshafts or camshafts to final dimensional tolerances Rz<10 μm, preferably ≦5 μm and concentricity tolerances ≦30 μm, preferably ≦6 μm, which have been machined and at least partially subjected to hardening, wherein after the first machining has been carried out and subsequent hardening to 45 to 60 HRC, preferably 50 to 53 HRC, a final machining is carried out by means of at least one milling tool, wherein it is provided that the final machining is carried out by means of cutting inserts made of coated hard metal. The invention further relates to a milling tool for precision machining of crankshafts or camshafts by carrying out the method of the invention.
Claims5
A milling tool for precision machining of crankshafts or camshafts using three different types of cutting inserts arranged along an external periphery of the milling tool,
- wherein the first type of cutting insert is coated with TiAIN or TiCrN and includes a generally cuboidal base body made of a coated hard material with two machining surfaces and a cutting edge along a transition from each machining surface to two opposing side surfaces, and a fastening opening extending through the two opposing side surfaces such that the first type of cutting insert is mounted on a surface that is substantially perpendicular to an axis of rotation of the milling tool, and
- wherein the second type of cutting insert is coated with TiAIN or TiCrN and includes a generally cuboidal base body made of a coated hard material with two machining surfaces and a cutting edge along a transition from each machining surface to the two opposing side surfaces, and a fastening opening extending through two opposing side surfaces such that the second type of cutting insert is mounted on a surface that is substantially perpendicular to the axis of rotation of the milling tool, and wherein one of the two opposing side surfaces is formed with two partial surfaces inclined at a non-zero angle with respect to each other separated by a transition edge passing through a center of the fastening opening, and
- wherein the third type of cutting insert is coated with cubic boron nitride (CBN) or polycrystalline diamond (PCD), and wherein the third type of cutting insert is mounted on a surface that is substantially perpendicular to the axis of rotation of the milling tool, and
- wherein the cutting inserts are secured to the milling tool by a fastening screw, and
- wherein a central axis of the fastening screw is substantially parallel to the axis of rotation of the milling tool.
Dependencies are inferred from the claim text.