How is the square tube formed?There are two major method to form square tube,one is real bend,another is empty bend.In the following, you will get details about the two methods of Steel Square Tube Suppliers square tube formation.
The solid bend, as the name implies, is compacted and bent, and the inner and outer rolls and the inner and outer walls of the tube blank are biaxially compacted during solid bending.
1) The advantage of solid bending is that the rebound is small, the forming is accurate, and as long as the roll type is accurate, the inner corner forming ř is more accurate.
2) The disadvantage of solid bending is that there is a stretching/thinning effect first, the solid bending causes stretching at the bending point, and the stretching effect shortens the longitudinal length of the bending line. Second, the metal at the bend bend becomes thinner due to stretching.
The hollow bend is formed by the unidirectional contact between the outer roller and the outer wall of the tube blank to form a bending moment to bend the strip. The hollow bend causes the bending line to compress, and the compression effect causes the bending line to longitudinally elongate, and the metal at the bend is thickened. This is the compression/thickening effect of the empty bend.
1) The advantage of the empty bend is that the side length can be bent when the solid bend cannot be performed, for example, the upper side/side side of the square tube is synchronously bent and finished. The hollow bend can also bend the internal angle of R < 0.2t without causing the tube wall to break.
2) The disadvantage of the empty bend is that when the upper side/side side is synchronized, the forming force easily exceeds the critical point due to the simultaneous pressure of the upper roll and the lower roll, causing the edge to be unstable and concave, and also affecting the stable operation of the unit. And molding quality. This is also a different feature of the rectangular tube and the tube when it is formed by air bending.
The characteristics and uses of square tubes:
1.square tube product description.
The square tube is a hollow square section light thin-walled steel pipe, also known as steel refrigeration curved profile. It is a section steel of square cross-section shape made by Q235 hot-rolled or cold-rolled strip or coiled steel as the base material after cold bending forming and then high-frequency welding. In addition to the thickening of the wall thickness of the hot-rolled thick-walled square pipe, the corner size and the straightness of the edge are both at or above the level of the cold-formed square tube of the resistance welding. Good comprehensive mechanical properties, good weldability, cold, hot workability and corrosion resistance, with good low temperature toughness.
2.the use of square tube.
The purpose of the square tube steel profile manufacturers is construction, machinery manufacturing, steel construction and other projects, shipbuilding, solar power support, steel structure engineering, electric power engineering, power plant, agricultural and chemical machinery, glass curtain wall, automobile chassis, airport, boiler construction, high-speed road railing, Building construction, pressure vessels, oil storage tanks, bridges, power station equipment, lifting transport machinery and other high-load welded structural parts.