Slip Prevention And Control Measures For Tandem Cold Rolling Mill

Slip phenomenon occurs during the rolling process, that is, the relative sliding between the strip and the mill rolls, in essence, the deformation zone of the strip is completely replaced by the front or back slip zone. Slip phenomenon occurs lightly affect the surface quality and yield of the strip, or cause a broken strip pile of steel accidents, in the past research, people tend to simply before the slip value or the size of the absolute value of the neutral angle as the basis for determining the probability of slip, that the smaller the front slip value or neutral angle, the more likely to slip phenomenon. In fact, this is extremely unscientific. For example, for the tandem cold rolling mill, the neutral angle of the last stand, the absolute value of the front slip should be much smaller than the first few stands, but this does not mean that the stand is most likely to slip.

1. Rolling speed

With the increase in rolling speed, the thickness of the lubricant film increases, the coefficient of friction decreases, the probability of slippage increases, and the rolling process becomes unstable. But because of the modern rolling production, how to improve production efficiency, high-speed rolling has become the goal of the production line, so in the prevention and control of slippage should not be at the expense of speed as the price.

Tandem Cold Mill

2. Lubrication system

Including the variety of lubricating fluid, concentration, temperature, etc., they affect the thickness of the lubricant film through changes in viscosity. For the Tandem Cold Mill, the choice of lubrication system plays a key role in the prevention and control of slippage is one of the main directions. Through analysis, we can know that with the increase of lubricating fluid viscosity, the thickness of lubricating oil film increases, the friction coefficient decreases, and, as the concentration increases and the temperature decreases, the lubricating fluid viscosity increases. In this way, for the cold rolling mill is prone to slippage of the rack (usually the penultimate rack), you can prevent slippage by appropriately reducing the concentration of lubricating fluid and improving the temperature of lubricating fluid.

3. Tension system

With the increase in post-tension, deformation zone lubrication layer thickness increases, so for easy to slip rack, can be properly reduced by the post-tension to prevent slippage.

4. Mill Roll roughness

Roll roughness mainly affects the friction coefficient, as the roll roughness decreases, the friction coefficient also decreases, slippage is easy to occur. Generally speaking, the roll roughness and rolling tonnage is closely related to the timely replacement of rolls to help prevent slippage.


Post time: Nov-30-2022