angular clearance |
The enlarged section below the die opening that allows the blank to fall from the die. |
blanking |
A shearing operation that creates a hole in sheet metal by separating an interior section. The removed piece of metal is the desired part. |
break off |
A practical term for the rough, fractured ring surrounding the edge of a blank. |
burnishing |
The creation of a shiny, polished surface on metal due to a shearing action. |
clearance |
The space between the punch and the die that allows metal to be cut. |
compressive force |
A force or pressure that attempts to flatten or squeeze a material. |
cut band |
A practical term for the burnished ring surrounding the edge of a blank. |
deflection |
The misalignment of components due to various stresses. |
deformation |
The moment during which the punch penetrates the sheet and metal flows into the die opening. Deformation and penetration cause the edge radius and burnished ring. |
double breakage |
The condition of two separate deformation stages caused by insufficient clearance. Double breakage causes two burnished rings on the blank edge. |
edge radius |
A rounded edge on a blank caused by the initial deformation as the punch begins to enter the die. |
fracture |
The moment during which cracks form and the blank separates with a tearing action. Fracture causes the roughened break off section on the edge. |
lubricant |
A fluid designed to reduce friction and cutting forces during a stamping operation. |
punching |
A shearing operation that creates an open hole in sheet metal by separating an interior section. The removed metal section is discarded scrap. |
shear strength |
The ability of a material to resist forces that attempt to cause the internal structure of the material to slide against itself. |
shearing |
The cutting and separating of material without the formation of chips. |
snap-through |
The moment during which the blank separates from the sheet and compressive forces are released from the die components. |
stripper |
A plate designed to remove sheet metal stock from the punch as it pulls away from the die during the operation. |
stripping |
The moment during which the punch retracts from the die and is removed from the sheet. |
taper |
An angled surface that appears on the edge of a blank. Taper is the result of clearance between the punch and die. |
tensile strength |
The ability of a material to resist forces that attempt to pull it apart or stretch it. |