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Special-shaped steel pipes, special-shaped steel pipes are bent and formed. This forming method is also commonly known as bending. There are two types of bending of special-shaped steel pipes, one is real bending and the other is empty bending.

The real bending square tube is compacted, then the bending of the bending, inner and outer roller tube 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 the forming of a more accurate, and at production time, as long as the roll type is used accurately, and the internal rebound of the steel tube after the forming is more accurate. The angle of the steel pipe can be guaranteed to be accurate.

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 bending line in the agricultural product stretching will shorten the length of the bending line in the length direction of the special-shaped steel pipe, and the metal content will be due to Stretch thin.

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

These two production methods, two basic methods, rectangular tube production square and special-shaped steel tube forming, according to the needs of different products, choose the appropriate process configuration. It should be noted that when stretching and compressing, the impression of product quality, or the resulting deformation of the square and rectangular tubes.