Drawing die "line" and "arc" - Tianchang Haitao wiredrawing mold factory

With the drawing speed, prominent problems become the drawing die service life. American T Maxwall and E G Kennth put forward the theory of new high-speed wire drawing die hole, namely "linear" theory. According to the theory of drawing die manufacture has the following characteristics:
Become lubrication of entrance area,, has the lubrication angle decreases, the lubricant is subject to certain pressure into the work area, so as to better lubrication results.
Lengthening the entrance area and work area, to establish the lubrication pressure better, its angle by drawing materials and each time the compression rate is preferred.
The sizing area must be flat and of reasonable length.
The part of the vertical line must be straight.
In recent years, the domestic wire drawing industry conducted extensive discussions on the "line" and "arc" drawing die, the controversial is the workspace shape and working area and sizing area at the junction of the shape. Many people hold a positive attitude towards the "linear" model. But the author thinks that the two types of wire drawing die have respective characteristics and application occasions, without analysis concluded that, at the end of non biased.
The core working area in "arc", will make the metal in the deformation zone flow more twists and turns, leading to increased deformation and excessive deformation work additional shear, the drawing stress increases (generally more "linear" model is increased by 10 ~ 30%). The "linear" die work area profile slope points in the same line, so that when we determine the optimal work zone cone half angle alpha, will be in the minimum stress state of drawing metal; and "arc" die because of the curvature of each point of the contour line is different, can not make the whole work area the existence of such a conic best work area half angle alpha. Benefit from the metal flow and reduce the drawing stress point of view, at present abroad in the pass compression rate is 10 ~ 35% (deformation most wires are within this range) wire and drawing, coarse specifications, generally uses the "linear" work area.
And the "arc" workspace, the deformed metal in the inner hole can increase with the degree of work hardening decreases gradually, the pressure distribution and the wear on the wall of the inner hole are uniform, so "wear arc type" good work area. Especially when the compression ratio is small (less than 10%), the "arc" work area, can obtain the deformation zone long enough in the work area under small cone half angle alpha. In addition to "arc" work area has strong ability to adapt the characteristics, the compression ratio is relatively high pass (more than 35%) or smaller (less than 10%) and drawing wire, or should the "arc".