与对称式三辊卷板机相比，四辊卷板机可以直接预弯板材端部不借助其它设备和

Compared with the symmetric three-roll machine, four pre-bend roller may be directly coiling the sheet end portion without the aid of other devices and molds. And remaining straight edge is small. <br>Compared to non-symmetric three-roll machine, four-roll bending machine may not make the turn around the rolled sheet material workpiece. Increases efficiency, part quality, and the process is simple, easy operation, reduce labor intensity.

与对称式三辊卷板机相比，四辊卷板机可以直接预弯板材端部不借助其它设备和模具。而且剩余直边较小。<br>与非对称式三辊卷板机相比，四辊卷板机可以不使板材调头而卷成工件。不仅提高效率、保证工件质量，而且工艺简单、操作方便、减轻工人的劳动强度。

Compared with the symmetrical three roll rolling machine, the four roll rolling machine can pre bend the plate end directly without other equipment and dies. And the remaining straight edge is smaller.<br>Compared with the unsymmetrical three roll rolling machine, the four roll rolling machine can roll the plates into workpieces without turning around. It not only improves the efficiency and ensures the quality of the workpiece, but also has the advantages of simple process, convenient operation and lightening the labor intensity of the workers.