In actual use, the influence on the roller ring There are many factors affecting the assembly, and improper assembly operations can lead to production failures such as roller bursting, roller loosening, and cone sleeve breakage. Therefore, classifying and analyzing the factors affecting the roller ring assembly and formulating a reasonable roller loading and unloading pressure range can effectively prevent accidents such as roller bursting, roller loosening, and cone sleeve breakage.

　　Factor Analysis Based on the structure of the high-speed wire rod mill roll ring, the factors affecting its assembly are analyzed. The geometric dimensions of the roll ring, cone sleeve, roll shaft, roll changer, and roll press directly affect the assembly of the roll ring and are important factors.

　　The roll ring uses WC material, with an HRC hardness of 83. It is a highly wear-resistant material. The roller ring center hole is in contact with the outer ring of the cone sleeve, so the fit tolerance between the roller ring center hole and the cone sleeve is a very critical parameter.

　　The inner circle of the cone sleeve is in direct contact with the roll shaft, using an interference fit. The taper of the inner circle of the cone sleeve should be consistent with the taper of the roller shaft and should not exceed the tolerance range. Otherwise, the contact area between the inner circle of the cone sleeve and the roller shaft will be affected, and the contact area should be greater than 70%. The roll puller and roll presser of the roll changer cooperate with the four ears of the cone sleeve to complete the roll loading and unloading through the set pressure value. The roller machine and roller presser cooperate with the cone sleeve ears, and the dimensions must be guaranteed.

　　Surface Hardness The inner circle of the cone sleeve is in direct contact with the roller shaft, using an interference fit. The hardness of the cone sleeve and the roll shaft should match. The HRC hardness of the roll ring is generally 55~65. If the hardness of the cone sleeve is too high, it is not conducive to the protection of the roll shaft. If the hardness of the cone sleeve is too low, the cone sleeve will undergo plastic deformation and cannot guarantee the torque requirements of normal rolling, causing cone sleeve slippage and roller loosening accidents. Therefore, the hardness of the cone sleeve needs to be guaranteed within a certain range. The hardness of the cone sleeve is 10~20 lower than that of the roll shaft. For example, the cone sleeve we use has an HRC hardness of 36~39, rarely causing cone sleeve slippage and roller loosening accidents.

　　Assembly Temperature If the roller ring, cone sleeve and roller ring If the temperature difference between the shaft is too large, due to the different thermal expansion coefficients, the roller ring, cone sleeve, and roller ring shaft will be subjected to uneven stress, and the roller loading and unloading will easily fail. During normal rolling, the roll shaft temperature is 50℃~60℃, and the roll loading and unloading requires the roll ring, cone sleeve, and roll shaft temperature to be around 25℃.

　　Therefore, the cooling water of the roller ring must be sufficient, and the pressure and temperature must be stable to ensure good cooling effect and avoid the roller shaft temperature being too high due to the roller ring temperature being too high. After stopping rolling, idle for 3 minutes to ensure that the roll shaft temperature drops to around 25℃.