Wavy symmetrical projections formed during cupping, deep drawing or spinning. Earing is caused by non-uniform directional properties in the aluminum and/or by improperly adjusted tooling.
A wavy projection in a regular geometric pattern on the rim of drawn cups formed in the course of deep drawing, as a result of directional properties or anisotropy of the sheet.
The formation of ears or scalloped edges around the top of a drawn shell, resulting from directional differences in the plastic-working properties of rolled metal with, across, and at angles to the direction of rolling. (See Figure E1)