What are the common problems of sheet metal bending processing?

When bending, one of the processes in sheet metal processing, he can make the sheet metal processed into the required three-dimensional workpiece, in the bending process of sheet metal bending, often encounter many problems. Understanding these common problems and their treatment methods can provide solutions for subsequent problems encountered in sheet metal bending processing to achieve fast and efficient production purposes. So what are the common problems of sheet metal bending processing? How to solve it?