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US 8,419,323 B2Granted
Method for fine-machining crankshafts and machining center therefor
AssigneeGerbrüder Heller Maschinenfabrik GmbH
InventorsBernd Faigle, Wolfgang Marker
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AssigneeGerbrüder Heller Maschinenfabrik GmbH
InventorsBernd Faigle, Wolfgang Marker
Estimating the term…
A method and machine for machining shafts, such as crankshafts of an internal combustion engine wherein the shaft supported on a workpiece carrier rotatably about its axis and the carrier is movable relative to a milling tool adjustably supported on the machine, the bearing surfaces of the shaft are fine-machined by a milling tool taking into consideration the resiliency and the bending of the shaft by the engagement force of the milling tool during fine cutting of the bearing surfaces in the various angular rations of the shaft and the axial bearing location between the shaft ends so as to provide for a perfect final round cutting of the bearings without the need for wet grinding. The fine machining is preferably achieved by dry machining and orthogonal rotational milling, all main bearings and lifting bearings being machined in a single clamping from the rough machining dimensions to the final dimension. For a second machining sequence, some of the main bearings and lifting bearings are used as clamping surfaces.
A method for fine-machining crankshafts (23) which has at least a first and a last centric bearing (35, 36), at least one eccentric bearing (48), a first end (27) and an opposite end (72), comprising the steps of:
A method for fine-machining a roughly pre-machined non-hardened or hardened shaft (23), the shaft (23) including at least a first and a last centric bearing (35, 36), at least one eccentric bearing (48), a first end (27) and an opposite end (72), comprising the steps of:
A method for the fine machining of a shaft (23) including at least a first and a last centric bearing (35, 36), at least one eccentric bearing (48), a first axial end (27) and an opposite axial end (72), comprising a machining sequence wherein a roughly machined and rolled shaft (23) or a roughly machined and hardened and rolled shaft (23) is supported at its centric bearings (35, 36) and then at least one eccentric bearing (48) including a bearing surface having a central annular area (61) and axial outer areas (59, 60) is machined using a geometrically defined cutting edge (32, 33) of a milling cutting tool (30) for cutting material from the bearing (48) surfaces, the milling tool (30) including an axis of rotation (19), and the central annular areas (61) of the bearing surfaces of the eccentric bearings (48) are provided with a roughness (Ra) which differs from the roughness at the axial outer areas (59, 60) of the bearings (48).
Dependencies are inferred from the claim text.