Special-shaped steel pipes, special-shaped steel pipes are bent and formed, this forming method is what we commonly call bending. There are two types of bending of special-shaped steel pipes, one is real bending and the other is empty bending.

The real curved square tube is compacted, and then the curved, internal and external roller tubes are compacted on the inner and outer walls of the special-shaped steel pipe, which is a two-way process. The advantage of the real bending of the rectangular tube is that the bending of the solid will be relatively small, and it will form a more accurate, and in production time, as long as the roll type is used accurately, and the shape of the steel tube after the internal rebound is more accurate The angle of the steel pipe, we can guarantee the accuracy.

There are certain disadvantages of instant bending, the main stretching time will cause the steel pipe to become thinner, the real bending will make the rectangular pipe bend, and the stretching and bending of agricultural products will cause the length of the bending line in the length direction of the special-shaped steel pipe to be shortened, and the metal content will be due to Stretch thinning.

Empty bent rectangular tube production, external rollers with square and special-shaped steel tubes on the outer wall of the tube, individual with metal bending, empty bending time, steel tube bending line will produce a certain compression, so the compression effect, the zigzag line of longitudinal variable length, a rectangular tube of bent metal, will become thicker with air bending, compressing or thickening the effect.

These two production methods, two basic methods of rectangular pipe production square and special-shaped steel pipe forming, according to the needs of different products, choose the appropriate process configuration. It should be noted that when stretched and compressed, the quality of the product will be affected, or the deformation of the square rectangular tube will be caused.