With the development of the domestic economy, especially in the construction industry, the widespread use of square tubes and rectangular tubes has also increased, and its increased use, its performance also put forward strict requirements, as well as in the production process. The main manufacturers produced by the current technology usually have two ways. The standard of the general tube process forming is curved. What is the square tube? The forming of rectangular tubes is usually called bending. This method of bending, however, in the square steel pipe industry will be classified as true bending, and the other is empty bending.
In fact, needless to say, everyone knows that during the bending process, the square tube moment compression produces bending deformation, and the inner and outer square and rectangular tubes, the inner wall of the bi-directional real pressure state roller, but, according to professionals, The main advantage of true bending is relatively small rebound, and when forming, it is very accurate. In its roll shape data, generally the inner corner is formed and more accurate and accurate. However, these two methods have a disadvantage, that is, the bending of the rectangular tube appears in the real, it can be stretched, reducing the length and thickness of the general stretching. However, the process of empty bending is to bend the compressed row of rectangular tubes, and the resulting bending line will be stretched to a length, and empty bending produces a thickening effect. The advantage of this method is that no matter the inner angle is smaller than R bending, wall breakage will never occur. The disadvantage is that due to the upward and downward pressure at the same time, the forming force will exceed the load and will affect the use of the tube in the rectangular direction. However, when possible in actual use, arrange as much as possible, and choose the appropriate location and correct operation during the construction process.
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