After descaling with high-pressure water, the steel billet in a three-roll mill first enters the space between the lower and middle rolls for rolling. Then, a lifting platform lifts the billet and reversibly rotates it to the space between the middle and upper rolls for rolling. This process is repeated until the billet reaches the required thickness, typically in five passes.
High Rigidity
① The mill's intermediate bearing housing is fixed to a "U"-shaped stand and has four screws. Both the upper and lower bearing housings can have high rigidity.
② The bearings are double-row radial spherical roller bearings with a retreat sleeve; they are installed and removed using a bearing loading and unloading pressure device (hydraulic nut), making installation and removal convenient and allowing for minute adjustment of the bearing radial clearance. In short, the mill's bounce value is easily controlled during production.
③ Due to the reduction in load-bearing components, the bounce value is small.
Easy Adjustment
The upper and lower rolls are easy to adjust and have good self-locking performance. The intermediate bearing housing has four screws, and the upper and lower bearing housings each have nuts and worm gear transmission mechanisms, allowing for precise adjustment.
Unique Structure: The upper balancing device has a unique structure. A disc spring is placed on the upper screw and has an adjustment mechanism, allowing for online adjustment of the spring force at any time.
Stable Installation: The mill base is a U-shaped frame, ensuring a secure mill installation. The intermediate bearing housing is fixed on the U-shaped frame, while the upper and lower bearing housings are adjusted independently and secured to the U-shaped frame with axial fixing mechanisms. Therefore, the mill is very stable during production, with minimal vibration and minimal impact on the dimensions of the rolled pieces.
Good Fixation: Axial adjustment and fixation are excellent. The mill minimizes the number of load-bearing and connecting parts to improve axial stability, thus facilitating the control of rolled piece dimensional accuracy.
