上辊向下加压后使得下辊反变形消除。上下辊很好地与材料贴合在一起，保证板

After the upper roller is pressed downward, the lower roller's anti-deformation is eliminated. The upper and lower rollers are well bonded to the material to ensure the same force and the same deformation at all points on the same layer of the plate. So as to achieve the purpose of eliminating barrel-shaped deformation and rolling a qualified cylinder. <br>This method can adapt to a wider range of plates than simply correcting the arc of the roller shaft. The effect is also better.

The downward pressure of the upper roller eliminates the reverse deformation of the lower roller. The upper and lower rollers fit well with the material to ensure that the forces at each point at the same level of the plate are consistent and the deformation is the same. In order to eliminate barrel deformation, roll out the purpose of qualified barrel body.<br>This method can adapt to a wider range of sheet plates than simply arcing the rollers. The effect is also better.

After the upper roller is pressurized downward, the reverse deformation of the lower roll is eliminated. The upper and lower rollers fit well with the material to ensure that the stress and deformation of each point on the same layer of the plate are consistent. So as to eliminate barrel deformation and roll up qualified cylinder.<br>This method can adapt to a wider range of sheet metal than simply arc correction of roller shaft. The effect is better.