The Cobalt bond and Silicon Bond diamond wire drawing PCD die type is generally divided into a curve (ie, an R type series) and a straight type (ie, a cone type series).

From the angle analysis of the wire deformation in the wire drawing mode, it seems that the curve type is better than the straight line type. This hole type is designed under 

the guidance of the "smooth transition" theory. The hole structure can be divided into "population" according to the nature of work. Five parts of “Entrance”, “lubrication zone”,

 “work zone”, “bearing zone” and “Exhit zone”. The junction of each department requires “chamfering”, smooth transition, grinding the whole hole into a large one. The diamond 

die blanks with a different curvature and a hole type can be applied at the time of drawing speed at that time. In order to meet the requirements of high-speed wire drawing, the

 "straight line" theory focuses on the lubrication and wear factors during the drawing process. It is pointed out that the improved linear drawing die hole type should have the 

following characteristics:

1) The longitudinal section lines of each part of the hole type must be straight, and the straight working cone has the smallest pulling force;

2) The intersection of the parts of the mold must be obvious, so that each part can fully play its role, avoiding the reduction of the actual length of the bearing area by the transition

angle.

3) Extend the height of the entrance area and the working area so that the wire enters the middle section of the working hole of the die hole, and the wedge shape formed by the 

inlet taper angle and the upper half of the working cone angle is used to establish a "wedge effect", and the surface of the wire material is formed more densely. A strong lubricating

 film that reduces wear and is suitable for high speed drawing;

(4) The bearing area must be straight and of reasonable length. The bearing zone is too long, the friction of the wire is increased, and the wire is easily broken or broken after being 

pulled out of the die hole. The bearing zone is too short, and it is difficult to obtain a wire with stable shape, accurate size and good surface quality, and the die hole is also will wear

out too badly.

Through practical application, the wire drawing die designed by the linear theory has a service life of 3-5 times higher than that of the R-shaped wire drawing die.