Year1
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As the name suggests, the square tube is a square tube. Many materials can be used to form a square tube. It is used as a medium and where it is used. Most square tubes are made of steel tubes. After unpacking, flattening, curling, and welding to form a round tube, the round tube is rolled into a square tube and then cut to the required length. Generally, square tubes per package are mostly of large sizes in stock. Square tubes are divided into structural square tubes, decorative square tubes, construction square tubes, mechanical square tubes, etc. according to their uses.
Square tube is a hollow square cross-section lightweight thin-walled steel tube, also known as steel cold-bent profile. It is a square-section steel with a square cross-section shape and size made from hot-rolled or cold-rolled strip or coil plate as the base material, which is formed by cold bending and then high-frequency welding. In addition to the thickening of the wall thickness, the corner size and edge straightness of hot-rolled extra thick-walled square tubes reach or even exceed the level of resistance welded cold-formed square tubes.
Forming method: folding. , Real bending, as the name implies, is the compaction of the bending. During the real bending, the inner and outer rollers and the inner and outer walls of the tube are compacted in two directions.
) The advantages of solid bending are small rebound and accurate forming. As long as the roller shape is accurate, the R of the inner corner forming is relatively accurate.
)The disadvantage of solid bending is the stretching/thinning effect. First, real bending will cause stretching at the bend, and the stretching effect will shorten the longitudinal length of the bend line. Second, real bending will cause the metal at the bend to become thinner due to stretching.
, air bending, air bending is through the one-way contact between the outer roller and the outer wall of the tube blank to form a bending moment to bend the strip. Air bending will cause compression of the bending line, and the compression effect will cause the bending line to extend longitudinally. The metal accumulates and thickens at the fold, which is the compression/thickening effect of the empty bend.
) The advantage of empty bending is that it can bend side lengths when real bending is not possible, such as simultaneous bending and finishing of the top/side edges of square rectangular tubes. The empty bend can also bend the inner corner of the R&. without causing the pipe wall to break.
) The disadvantage of air bending is that when the Shenao square and rectangular tube is synchronously air bent on the top/side, due to the pressure generated by the upper roller and the lower roller at the same time, the forming force easily exceeds the critical point, causing the edge to become unstable and concave. And it will also affect the stable operation of the unit and the molding quality. This is also the different characteristics of square and rectangular tubes and round tubes during air bending.
Square tube classification:) Folding process classification
Shen'ao square tube is divided according to the production process: hot-rolled seamless square tube, cold-drawn seamless square tube, extruded seamless square tube, and welded square tube.
Among them, welded square pipes are divided into: according to process && arc welded square pipe, resistance welded square pipe (high frequency, low frequency), gas welded square pipe, furnace welded square pipe (b) according to welding seam && straight seam Welded square tube, spiral welded square tube
Folding material classification: Square tube is divided by material: plain carbon steel square tube, low alloy square tube. Ordinary carbon steel is divided into: # steel, # steel and other low alloy steels are divided into, etc.
Folding production standard classification: Square tubes are divided according to production standards: national standard square tube, Japanese standard square tube, British square tube, American standard square tube, European standard square tube, and non-standard square tube.
Square tubes are classified according to their cross-section shapes: simple cross-section square tubes && square square tubes, rectangular square tubes, complex cross-section square tubes && flower-shaped square tubes, open square tubes, corrugated square tubes, special-shaped square tubes
Square Pipes are classified according to surface treatment: hot-dip galvanized square pipes, electro-galvanized square pipes, oiled square pipes, pickled square pipes
Square pipes are classified by use&& square pipes for decoration, square pipes for machine tools and equipment, and square pipes for machinery industry Square tubes, square tubes for chemical industry, square tubes for steel structures, square tubes for shipbuilding, square tubes for automobiles, square tubes for steel beams and columns, square tubes for special purposes
Square tubes are classified according to wall thickness&& Extra thick wall square tubes Pipe, thick-walled square pipe and thin-walled square pipe
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