The functions of each area of the mold core are: the entrance area, which facilitates threading and prevents the wire from scratching the drawing die from the entrance direction; the lubrication area, through which the steel wire is easy to bring lubricant; the working area is the main part of the die hole, and the deformation of the wire The process is carried out here, that is, the original cross-section is reduced to the required cross-sectional size.
When drawing conical metal, the space occupied by the volume of the metal in the working area is a truncated cone, which is called the deformation zone. The cone half angle α (also known as the die hole half angle) in the working area is mainly used to determine the drawing force; the sizing area is used to obtain the exact size of the drawn steel wire; the exit area is used to prevent the unsteady exit of the steel wire And scratch the surface of the wire.
With the increase of the wire drawing speed, the service life of the wire drawing die has become a prominent problem. Americans T Maxwall and E G Kennth proposed a new wire drawing die hole pattern theory suitable for high-speed wire drawing, that is, the "straight line" theory.
