Method and production line for machining a crankshaft

摘要

A method for completely machining at least unprocessed centric journals (10) and crankpin journals (11), and the respective flat shoulders (9, 10) thereof surrounding the journals, of flanged or cast blanks of a crankshaft first includes turning the flat shoulders (9) associated with the journals (10). Then, the centric journals (10) are roughly ground without the flat shoulders (9) thereof and the crankpin journals (11) are roughly ground together with the flat shoulders (12) thereof. After the journals (10, 11) have been roughly ground, an allowance remains that is smaller than an allowance required for common finish grinding of journals and flat shoulders. The rough grinding is followed by the finish grinding of the centric journals (10) and the crankpin journals (11) from the smaller allowance (23) remaining due to the rough grinding to the final dimension.

主权项

1. Method of complete machining at least of unmachined central journals and crankpin journals as well as respective flat shoulders of forged or cast blanks of a crankshaft which surround the journals, wherein the method comprises:
a) first, only turning the flat shoulders associated with central journals of the crankshaft; b) then, rough grinding the central journals without rough grinding their flat shoulders and rough grinding the crankpin journals while also rough grinding flat shoulders (12) of the crankpin journals, wherein the rough grinding occurs until an oversize remains on the central journal, the oversize being smaller than a conventional oversize, which necessarily remains if the rough grinding of the flat shoulders takes place after a conventional procedure including rough grinding, turn broaching or trochoidal milling; and c) thereafter, finish grinding the central journals and the crankpin journals to a final dimension from the smaller oversize achieved by the rough grinding.