1. After sheet metal splicing, rolling tiles (pipe joints), or longitudinal welding after rolling, roll welding, correction and arc repair with a rolling machine

2. As the rated rolling capacity of the three roll plate rolling machine cannot reach the force required by the plate thickness indenter, the straight edge of the indenter exceeds the standard. Therefore, in order to prevent the appearance of super standard straight edges, the length of the passive lengthening plate is to lengthen each end of the plate by more than 50mm. After the ceramic tile is rolled and formed, the length allowance at both ends shall be stolen.

3. Due to insufficient rated capacity or improper operation of three roll plate rolling machine, the straight edge of ceramic tile or pipe joint is too large during longitudinal welding.

4. When the sheet metal pressure head is on, the pressure head is often the main index determining the rated capacity of the plate bending machine due to the large down pressure of the upper roll.