Most of the equipment used is general mechanical press or hydraulic press, but it is also suitable for special bending press. The commonly used bending equipment is plate rolling machine. According to the principle of three-point circle determination, the three-roll plate mill continuously bends the slab. The three high mill has two drive rolls (fixed) and one lower roll (adjustable) The relative distance between the press roll and the drive roll can be changed by adjusting the upper and lower positions of the press roll. When bending, place the plate between the drive roll and the press roll, and the drive roll rotates in the positive and negative directions to make the plate reciprocating. By adjusting the pressure roller, press it down gradually to bend it into cylindrical surface, conical surface and small curvature double surface with required curvature.