Theoretical Model and Loading Analysis of Crankshaft Fillet Rolling

In this paper, the equivalent mechanics model of strengthening crankshaft fillet through the rolling process is established. The calculation formulae of limit rolling load are deduced by considering of the influence of structural parameters of crankshaft and rolling cutter, layout situation of rolling cutter and material property parameters. The relationship between rolling load and stress is studied and the correcting method by using the plastic coefficient is put forward: the selection of rolling load should not only rely on the structural parameters of crankshaft but also should consider of the influences of material properties, structural dimensions of crankshaft and rollers and layout situation of rolling cutters. Calculation and test verification is carried out by example of 480Q crankshaft. the calculating formulas of the limited rolling loads and the principle about selecting the rolling loads which is provided by this paper are propitious to turn away the situation of ldquono evidence to rely onrdquo in selecting loads of rolling equipments at present.