With the continuous expansion of radial tire production, the demand for steel cord is also growing rapidly. The dry drawing die is also very important.
Dry drawing die is used in the process of rough drawing and intermediate drawing. The design of its material and structure directly affects whether the drawing process is smooth or not and the quality of steel wire.
The hardness of tungsten carbide is as high as HRA 86-95, its wear resistance and high temperature stability are much higher than those of alloy steel, and its cost and processing formability are better than those of polycrystalline diamond and ceramic materials.
With the improvement of tungsten carbide material and drawing die structure design, it has been widely used. It can be designed according to different drawing wire and different drawing environment the suitable grade of cemented carbide should be selected to meet the requirements.
The below picture is the structure diagram of the dry drawing die. The lubrication r at the inlet, the compression angle and height of the working compression zone, and the height of the sizing belt all directly affect the surface quality of the steel cord
quantity and broken rate.
The drawing speed of the dry drawing die reaches 10 - 25m / s, so the wear resistance of the dry drawing die has a higher requirement. Using cemented carbide wire drawing die, each dry drawing die can draw 2.9
-At the same time, the surface quality of the wire is improved, so that the broken rate of twist strand is controlled within 3 times / ton.