In the actual use of the process, the impact of the support.Roll ringThere are many factors in assembly, and improper assembly operation will lead to production failures such as roller bursting, roller loosening, and cone sleeve fracture. Therefore, the factors affecting the assembly of the roller ring are classified and analyzed, and the reasonable loading and unloading pressure range of the roller can effectively avoid the occurrence of accidents such as roller burst, roller loosening and cone sleeve fracture.

According to the structure of the roller ring of the high-speed wire rod mill, the factors affecting its assembly are analyzed. The geometric dimensions of the roller ring, taper sleeve, roller shaft, roller changer and roller press machine directly affect the assembly of the roller ring and are more important factors.

The roller ring is made of WC material, and the hardness of HRC reaches 83. It is a kind of high wear-resistant material. The center hole of the roller ring is in contact with the outer ring of the taper sleeve, so the fit tolerance between the center hole of the roller ring and the taper sleeve is a very critical parameter.

The inner circle of the taper sleeve is in direct contact with the roller shaft, and the interference fit is adopted. The taper of the inner circle of the taper 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 ring of the cone sleeve and the roller shaft will be affected, and the contact surface should be greater than 70%. The roller puller and pressure roller of the roller changing car are matched with the four ears of the taper sleeve to complete roller loading and unloading through the set pressure value. The drum machine and the drum press shall be matched with the taper sleeve ear, and the size shall be guaranteed.

The inner ring of the surface hardness taper sleeve is in direct contact with the roller shaft, and the interference fit is adopted. The hardness of the taper sleeve and the roller shaft should match. The HRC hardness of the roller ring barrel is generally 55~65. If the hardness of the taper sleeve is too high, it is not conducive to the protection of the roller shaft. If the hardness of the taper sleeve is too low, the taper sleeve will produce plastic deformation, which cannot guarantee the torque requirement of normal rolling, causing the taper sleeve to slip and roll loose accidents. Therefore, the hardness of the taper sleeve needs to be guaranteed within a certain range. The hardness of the taper sleeve is 10~20 less than that of the roller shaft. For example, the HRC hardness of the taper sleeve we use is 36~39. It rarely causes the taper sleeve to slip and roll loose.

Assembly temperature If the idler ring, taper sleeve andRoll ringThe temperature difference between the shafts is too large, due to the different thermal expansion coefficients, resulting in uneven stress on the roller ring, taper sleeve and roller ring shaft, and the roller loading and unloading is prone to failure. During normal rolling, the temperature of roller shaft is 50 ℃ ~ 60 ℃, and the temperature of roller ring, taper sleeve and roller shaft is required to be about 25 ℃ during loading and unloading.

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