The forming method of rectangular tube is described briefly
Time： 2024-04-23 14:40:23
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1. Solid bending
Real bending, as the name suggests, is compacted bending, and the inner and outer rollers and the inner and outer walls of the tube billet are compacted bidirectional during real bending.
1) The advantages of solid bending are small rebound, accurate molding, and as long as the roll shape is accurate, the R of the internal Angle molding is more accurate.
2) The disadvantage of solid bending is that it has a stretching/thinning effect. First, the real bending will cause the bending point to produce tension, tensile effect will shorten the length of the bending line; Second, the metal at the real bend is thinned by stretching.
2. Empty bend
Empty bending is the bending moment formed by the unidirectional contact between the outer roller and the outer wall of the tube blank to bend the strip material. Empty bending will compress the bending line, and the compression effect will cause the bending line to extend longitudinally, and the metal at the bending place will accumulate and become thicker, which is the compression/thickening effect of empty bending.
1) The advantage of empty bending is that side length bending can be performed when solid bending is not possible, such as synchronous bending and finishing of the top/side of the square tube. Air bending can also bend the inner Angle of R<0.2t without breaking the tube wall.
2) The disadvantage of air bending is that when the square rectangular tube is synchronized in the upper/side air bending, the forming force is easy to exceed the critical point due to the pressure generated by the upper roll and the lower roll at the same time, resulting in the instability of the side and the concave, and will also affect the stable operation of the unit and the forming quality. This is also the different characteristics of square tube and round tube air bending.
In practical application, these two basic methods should be configured to a reasonable process position according to the product needs in square tube molding. Attention should be paid to the impact of the stretching/thinning effect of solid bending and the compression/thickening effect of air bending on product quality, otherwise it will cause the side of the square tube to be concave when forming, and the finished tube will be warped longitudewise, and it is difficult to straighten.
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