对中板料放入卷板机时，我们为了防止歪斜造成工件扭斜，要进行对中。从而，

When the <br>centering sheet is put into the bending machine, we must perform centering in order to prevent the workpiece from skew caused by skew. Thereby, the generatrix of the workpiece is parallel to the roller, and the rounding quality is ensured.

Yes.<br>When the plate is put into the roll plate machine, we want to prevent the skew caused by the workpiece to twist, to be in the right. Thus, the bus line of the workpiece is parallel to the roller, ensuring the quality of the roll circle.

Alignment<br>When the sheet is put into the bending machine, we should align it in order to prevent the workpiece from skewing. Thus, the generatrix of the workpiece is parallel to the roller to ensure the quality of rolling.<br>