To Know 3 Using Problem of Wire Drawing Dies in 3 Minutes
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To Know 3 Using Problem of Wire Drawing Dies in 3 Minutes
The service life of wire drawing dies will not only affect the production costs, but also affect the product quality and production efficiency. Therefore, we need to pay special attention to the following three issues about the selection of wire drawing die and application process.
The working area of the wire drawing die is mainly composed of four parts: the entrance part, the reduction part, the bearing part and the exit part. A series of wire drawing dies are used to reduce the diameter of rods and wires. A reasonable drawing process can ensure the quality of the wire and the service life of the drawing die.
Problems Caused by Improper Selection of Working Cone Angle
The large working cone angle will cause the wire to enter the wire drawing die at the point of contact very close to the bearing part. That is, the compression zone becomes shorter, causing the wire to deform at a faster rate and generating a lot of heat. It will eventually affect the structure of the wire and increase the consumption of the mold. If the working cone angle becomes larger, it is difficult for the wire rod to smoothly transition to the bearing part. It is easy to cause the wire to be concave, resulting in diameter reduction, and even diameter reduction or ellipse phenomenon.
The small working cone angle results in the incoming wire contact point being close to the upper end of the working cone. Then, the extension of the deformation zone increases the residual work and heat generated by the wire drawing machine to the steel wire, and increases the power consumption of the wire drawing machine. In addition to this, the reduction of the lubrication zone reduces the lubrication effect. It will eventually lead to poor lubrication, resulting in metal chips and broken wires, overheating, and shrinkage.
Center Fracture and “人” Shape Crack Phenomenon
The phenomenon of center fracture and “人” shape crack has been regarded as a problem caused by the raw material since its discovery. However, it was not until 1930 that Fenhi pointed out that the central fracture and “人” shape crack were caused by the unreasonable arrangement of the drawing process.
During the wire drawing process, the internal structure of the wire extends along the axial direction, and the flow velocity of the structure on the surface of the wire is greater than the flow of the internal structure, and a tensile stress in the axial direction will be generated at the center of the wire drawing die core. When the axial tensile stress exceeds the tensile strength of the drawn material, “人” shape crack will occur in the core of the material, and in severe cases, cup-cone fracture will occur.
Residual Stress and Work Hardening Phenomena
Residual stress and work hardening are caused by residual work, which aggravates the hardening of the material, which will seriously crack and peel the surface of the wire, making it difficult to draw. If the process arrangement is unreasonable, the residual work will increase, the energy consumption of the equipment will be increased, and the production cost will increase.
As a common tool for the deformation of metal products, no matter how the shape and structure of the wire drawing die change, the purpose is to ensure production efficiency and product quality. Therefore, the manufacturers should establish strict mold repair and inspection methods, formulate reasonable drawing processes, and strict quality control to ensure product quality. However, the wire drawing dies will always encounter various unexpected situations during the working process, just as every dice will fail sooner or later. If you find that there are no problems during production, then congratulations. If you have above similar problems, welcome to contact us. Our wire drawing die production technology is mature, and there are professional technicians. Welcome to communicate with us, we are willing to provide corresponding guidance.
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