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01 / Key Specifications
This machine corrects bend without collapsing the cross-section — the problem that separates tube straightening from bar straightening. It handles thin-wall tube that would ovalize in a conventional press and thick-wall tube that needs serious force without cracking the material.
02 / Features & Highlights
No two tube defects behave the same. A thin-wall stainless exhaust tube and a 28 mm wall hydraulic cylinder tube both need bend correction, but the press strategy cannot be the same. The system below switches between force and position control automatically.
Pressure straightening through multi-point contact means no point indentations, no scratches, and no collapse on 1 mm wall stainless or copper tube. The ram dwell is capped and the support rollers are profiled to the tube OD before every run.
For heavy-wall DOM and hydraulic cylinder tube, the system ramps force in 5 kN increments while reading laser displacement. It gets to full press force without overshooting into ovality — a common failure when operators chase straightness manually.
Three to five laser measurement heads track deflection along the whole tube axis, not just at the ram contact point. Spring-back at the far end shows up immediately, so the correction cycle is based on actual straightness, not a single midpoint reading.
Every correction result feeds back into the control algorithm. After 20–30 pieces, the machine has learned how much spring-back your material grade and wall thickness produce, cutting cycle time and reducing rework on the next batch.
03 / Technical Data
04 / Applications & Gallery
Thin-wall tube failures are expensive: a collapsed cold plate or a kinked hydraulic line stops the whole assembly. These are the applications where our tube straightening cell runs everyday.
Straightening 1–3 mm wall stainless and copper tube for server cold plates and rack manifolds. Roundness is measured after correction to make sure the coolant passage ID stays clear.
Battery cooling tubes, EGR lines, and axle tubes. The machine holds 0.2 mm/m straightness on sensor-sensitive battery cooling lines without tearing the thin wall.
DOM tube for hydraulic cylinders. Wall thickness from 8–28 mm gets full-force correction without ovalizing the cylinder bore.
Square and rectangular steel tube for frames, handrail, and structural members. More on this below — it is a Shangda specialty.
Square tube is not round tube with corners. When you straighten a rectangular or square section, the same force that removes bow can push the side walls into a belly or collapse the corner radius. Most straightening suppliers avoid this profile because it requires different support dies, a different ram path, and more measurement points. Shangda runs square tube straightening as a core application, not an afterthought. We set the support rollers to contact the tube at the neutral axis points, measure straightness in two planes simultaneously, and adjust ram pressure so the section's flat sides stay flat while the bend comes out. The result: square and rectangular tube leaves the cell with straightness under 0.2 mm per meter and corners that still pass weld-prep and assembly checks. If your current supplier only quotes round tube, that is usually because square tube demands a machine designed from the start to handle profile shapes.
If you are fighting ovality, wall thinning, or square tube straightening, send us your tube material, diameter, wall thickness, and current straightness data. We will run a sample test on the automatic tube straightening cell and return measured straightness and roundness reports before you commit. No generic quote — you get a straightening recipe your operators can repeat shift after shift.
Automatic Tube Straightening Machine
Shangda's automatic tube straightening machine removes bow from round, square, and rectangular tube without sacrificing wall thickness or circularity. Multi-point pressure correction, laser measurement at three to five stations, and AI closed-loop control deliver straightness to 0.15 mm per meter and roundness holding to 0.01 mm — on wall thicknesses from 1 mm to 28 mm.
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