carbide wire drawing dies
For carbide wire drawing dies, we also have lots of grades:
Other carbide dies we produce
Common problems in the use of wire drawing dies
1. Problems caused by improper workspace design
If the angle of the working area is too large, the deformation rate will increase due to the too small distance from the sizing belt during the drawing process of the metal material, and the deformation area will become smaller, which will cause the drawing die to generate a lot of heat, burn the lubricating powder, and make it invalid. Thus, the wire drawing effect is seriously affected. At this time, if the working area is not cooled, it will directly affect the drawing quality of the metal filament; if the angle of the working area is larger or the compression rate is smaller, the metal material will be drawn closer to the sizing belt. , the deformation is larger, and it is difficult to reach the specified area of the sizing belt so that the surface will form a convex and concave phenomenon. If the material is soft, the ellipse phenomenon will occur during the drawing process. At this time, the area of the lubricating area increases, which can reasonably provide a better lubricating effect, but this is not the case. On the contrary, the lubricating powder has an eddy current effect due to the enlarged surface release area, which flows out from the die hole in the reverse direction, thereby reducing the lubricating effect eventually leads to the formation of cracks on the surface of the metal wire or the appearance of scratches.
It can be seen from the above that the angle of the working area should not be too large, and if it is too large, the lubricating powder will lose its lubricating effect, and the wire drawing quality will be further improved. What happens if the angle is too small? Operational experience shows that when the angle of the working area becomes smaller, the drawing die will generate a lot of heat, which will make the lubricating powder ineffective. Because when the angle is too small, the contact point of the metal material is close to the top of the working area, which increases the deformation area, which in turn leads to an increase in the useless power of the drawing die and a large amount of heat. In addition, when the area of the lubricated area is reduced, since the amount of lubrication is also reduced, the lubricating function is reduced, which in turn affects the drawing quality of the metal wire. When the tensile stress increases, the diameter of the sizing belt will become larger, which makes the ellipse phenomenon easy to appear, which in turn leads to the easy breakage and shrinkage of the metal wire.
2. The wire drawing die is prone to breakage
When the wire drawing die is in operation, there are usually two fracture modes, one is a herringbone fracture, and the other is a center fracture. Before the 1930s, these two fractures were thought to be caused by the substandard quality of metal materials. Therefore, in order to avoid breakage, efforts are usually made on the material, but no matter how the quality of the material is improved, the breakage cannot be effectively prevented. After that, attention gradually shifted from the material to the drawing process. After continuous research and accumulation. Finally, in 1930, Fenhison's research proved that the appearance of the two kinds of fractures was caused by the unreasonable setting of the drawing process, and was not directly related to the material. He further described the fracture process: when the metal material is drawn, it extends axially toward the wire drawing die. Since its surface flow velocity is greater than that of the interior, tensile stress is formed in the center. When this force exceeds the tensile limit of the metal material, there will be a herringbone break or a center break. Since the drawing process has a serious impact on the drawing quality of the metal wire, before drawing, the appropriate drawing process should be determined according to the material characteristics and the type of wire drawing die. In order to improve the drawing quality of the metal wire, Zimerman established a drawing model, which reasonably arranges the metal material, compression ratio, and center fracture to obtain a reasonable drawing process, which effectively improves the drawing quality and reduces the A fracture occurs in the system.
3. Residual stress and work hardening during the drawing process
In the drawing process of metal materials, if the residual power is too large, there will be disadvantages such as residual stress and work hardening, which will cause unevenness, fracture, and peeling on the surface of the drawn material. The research shows that the appearance of these two phenomena is closely related to the drawing process. Therefore, the residual power can be effectively controlled by controlling the compression ratio and zone angle in the link. According to previous operating experience, when the die angle of the steel wire is too large or the compression ratio is too small, a large amount of residual power is easily generated, and the corresponding residual stress and work hardening value are larger; when the die angle is too small or the compression ratio is too small, then The drawing process does not meet the drawing requirements, so the residual power will also be increased. Therefore, in foreign countries, the △ under the die angle and compression ratio is usually controlled at about 1.5. Thomas Maxwell made a further study on the influence of die angle and compression value on residual power and showed that when the length of the sizing belt is between 72% and 100% of its diameter, it can be effectively reduced by controlling between 1 and 1.5. Residual power, thereby avoiding material breakage or deformation.
Our Quality control
We operate strictly in accordance with ISO 9001 standards for production and use the ERP and MES systems to control the production process. At present, our products have been exported to Europe and the United States, Southeast Asia, Africa, South America, the Middle East, and other regions.
Hot Tags: carbide wire drawing dies, China, suppliers, manufacturers, factory, custom, wholesale, hot sales
