Contact pressure distributions in nosing and flaring of tubes with conical tool

Abstract

Contact pressure distribution in nosing and flaring of thin walled aluminum and copper tubes was measured by using pressure sensitive sheets to achieve the condition for reducing the contact pressure and for uniforming its distribution. The maximum contact pressure always arises near the contact boundary of tool inlet both in nosing and flaring. Contact pressure increases toward the end of tube except this region. Influences of tool semiangle, frictional coefficient and material properties such as n- and r-values on contact pressure were examined in detail experimentally and theoretically. Calculated values by membrane theory qualitatively agree with experimental ones except the region near the tool inlet both in nosing and flaring.