Effects of Uneven Cooling After Rolling on Products of Wire
Wire rolling is an important method widely used in metal forming, it is characterized by small deformation rate, easy realization of continuous automation production and high productivity, and usually adopts roller method of hydraulic or motor drive cold or thermal forming. In the process of wire rolling production, because of different reasons, the cooling state of the product after rolling is often uneven and inhomogeneous, which affects the performance and quality of the product, bring potential safety risks, affect the development and utilization of related products. This paper discusses the effects of uneven cooling after rolling on the product of wire, hoping to provide reference and solutions for avoiding similar problems.
The wire rolling process consists of two parts, namely rolling deformation and cooling of the finished product. During the rolling process, the temperature of the wire material increases due to plastic deformation and friction heat, and increases with the emergence of annealing phenomenon; on the other hand, the material has been subjected to excessive stress, coupled with the existence of poisson compression containing internal stress. These internal stresses tend to cause the material to undergo irreversible strain, warping and deformation, so the timely cooling of the finished product is required. If the cooling effect is not homogeneous, the residual strain and stress inside the material will remain, which will have serious consequences.
In general, if the cooling after rolling is not even, it will cause the metal material to have a certain distortion or segmentation phenomenon. It will not only affect the machining accuracy of the product and the stability of the size, but also reduce the hardness, strength and plasticity of the product. In addition, overcooling or undercooling of the product can cause serious fatigue, brittle fracture and embrittlement of the material. During the rolling process, due to the alloy composition, the balance of physical properties within the material is disturbed, leading to premature failure of the material, and the use of wire products is limited.
In order to reduce the effects of uneven cooling after rolling on the product wire, it is necessary to implement effective treatment measures. During the rolling process, a numerical control rolling machine should be used to accurately monitor the temperature of the material, and the cooling time should be extended if necessary. In addition, in the process of rolling, outer air cooling device should be used, in order to ensure the uniformity of air flow and average cooling rate. In addition, when lubricants are used during the rolling process, high-quality lubricants should be selected to reduce the friction between the rolling surface, so as to ensure the uniform temperature of the product after rolling.
In short, the uneven cooling after rolling can cause great damage to the product of the wire. Therefore, the operators must carefully control the cooling effect in the rolling process, and take preventive measures to ensure the uniform cooling effect of the product after rolling. This is the only way to guarantee the quality of the product, avoid potential safety risks and make better use of related products.
