Patent ID: 6591659
Filing Date: 2003-07-15
Classification: G01N

Abstract:
A process for determining frictional properties of a sheet metal during forming, wherein a sample of said sheet metal is drawn between gripping jaws at a specified surface pressure, comprising:applying a specified surface pressure to said sample of sheet metal, wherein said specified surface pressure is defined according to a time-dependent predetermined characteristic curve and wherein said specified surface pressure changes continuously; drawing said sample of sheet metal between said gripping jaws, wherein said sample of sheet metal is drawn at a drawing speed specified by a time-dependent predetermined characteristic curve; measuring a drawing force over time, said drawing force being required to draw said sample of sheet metal between said gripping jaws at the drawing speed specified by the time-dependent predetermined characteristic curve; and calculating said frictional properties as a function of surface pressure from said specified surface pressure and from said measured drawing force.