Forming method of hollow section

Referred to as the bending pipe forming way, party is called bending torque tube forming. There are two basic methods: bending forming bending and empty.

1, solid bent

Real curved, just as its name implies is to compaction the bending, real turn inside and outside the interior and exterior wall two-way compaction roller and the tube billet.

1) the real bending rebound is small, the advantages of accurate molding, and as long as accurate roller type, inside molding R is more accurate.

2) real disadvantage is that the bending tensile/thinning effect. First, the real turn will make the roots stretching, bending tensile effect makes the meander-line longitudinal length shorten; Second, real break curved metal due to stretching and thinning.

2, empty

Empty bending is through the roller and the outer wall of tube billet one-way contact form make the pick-up bending moment, empty curved meander-line causes compression, compression effect makes the meander-line longitudinal elongation, bent metal accumulation in thickening, this is an empty bending compression/thickening effect.

1) empty bending can be in to the advantages of real curved side length of the bending, such as the top of the torque tube/side synchronous bending and finishing. Empty corner can also bend R < 0.2 t inside without breaking the wall.

2) empty torque tube bending fault is on the top/side synchronous empty turn, because on the roller and the lower roller pressure at the same time, the forming force beyond the tipping point, easily causing instability concave of edge, and also affects the stable operation of unit and forming quality. This is the moment when the empty tube and circular tube bending forming different features.

In practical application, these two basic methods, in the torque tube forming should be according to the product need to be configured to reasonable technical position. Should pay attention to the tensile/thinning effect of solid forming and empty bending forming of the effects of compression/thickening effect on product quality, otherwise will lead to the torque tube forming side concave, the finished tube longitudinal buckling, and difficult to straightening.

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