This paper addresses an approach to calculate the friction coefficient during nonuniform compression of cylinders. The approach combines new frictioncalibration curves (prepared using the finite-element analysis) that relate friction to workpiece shape and the foldover model from Part I. Foldover in upsetting is used in the same way that the change in internal diameter is used in the ring test to determine friction. However, the new approach has the advantage that measurements are taken directly from the workpiece. Comparisons of friction values calculated from the ring test and the new approach showed good agreement.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of Manufacturing Science and Engineering, Transactions of the ASME|
|State||Published - Aug 1990|