Nomenclature

LEGEND

A. Approach Angle / Front Bell
B. Blend
C. Reduction Angle/Drawing Angle
(Shown at 18°. Normal for Soft Materials is 16° – 20°. Hard Materials is 12° – 16°.)
D. Wire Contact Area/Impact Point
E. Bearing Length (Shown at 50% of Hole Diameter. Normal for Soft Material is 20% – 40%. Hard Material is 40% – 60%.)
F. Polished Back Relief
G. Exit/Back Bell

Approach Angle – Also known as the Front Bell. The Approach Angle area accommodates both wire and lubricant. The approach area is designed so that, in the wet draw process, a consistent film of lubricant encases the wire as it travels along the die wall through both the reduction and bearing area.

Reduction Angle/Drawing Angle – The wire begins the deformation process in this area of the die. The Reduction or Drawing Angle is expressed in degrees.

Impact Point - This is the point of surface that first comes in contact with the drawn material. Normal wear patterns develop just below this contact point.

Bearing – The Bearing area creates the final exit size of the wire. The Bearing area length is expressed as a percentage of the hole diameter.

Polished Back Relief – This is a highly polished relief angle that helps to reduce metallic fines and potential wire shaving due to misalignment.

Exit - Also known as the Back Bell. The drawn material exits through this area of the die. Its shape provides the strength and support needed to withstand the drawing stresses.

% of Area
Reduction
Per Draft
Type of Material to be Drawn
Gold
Silver
Zinc
Aluminum
Nickel
Copper
S. Steel
Alloys
Brass
Hard Alloys
High Carbon
Steel Wire
Hot
Tungsten
4 to 8%14101089
8 to 12%1612121010
12 to 16%1814141211
16 to 24%2218161412
25 to 35%2422201814