Problem
Trying to form tube in too few passes overworks the strip edges, causing edge strain, thinning at the weld line, springback and inconsistent weld gaps.
Cause
Heavy forming in a single pass concentrates bending at the edges, so the strip yields unevenly, edges thin and the weld gap varies along the pipe, which the welder cannot correct.
Solution
The ZY16 spreads the bend across five rough forming stands, gradually closing the strip toward an open-tube profile. Each stand takes a controlled share of the deformation, protecting edge thickness and leaving a stable gap for the precision stage, which improves weld consistency on the full Φ8-18mm range.
Key Engineering Data
- Five stands distribute the bend to reduce edge strain.
- Gradual closing protects strip edge thickness at the weld line.
- Leaves a stable, even gap for the precision forming stage.
- Suits thin-wall and coated strip that tolerate less over-forming.
| Parameter | Specification |
|---|
| Mill Model | ZY16 |
| Tube OD Range | Φ8-18 mm |
| Wall Thickness | 0.4-1.0 mm |
| Strip Width Range | 25-57 mm |
| Max Line Speed | 90 m/min |
| HF Welder Power | 100 kW Solid-State High Frequency |
| Strip Material | Hot Rolled / Cold Rolled / Galvanized Steel |
| Uncoiler | Double-Mandrel Pneumatic, 1.5-Ton Coil Capacity |
| Accumulator | 200 m/min High-Speed Cage |
| Strip Leveling | Seven-Roller Leveling Unit |
| Forming Stands | 5-Stand Rough + 3-Stand Precision |
| Roller Geometry | Double-Radius Forming Rollers |
| Roller Shafts | 42CrMo High-Strength Alloy Steel |
| Safety | Forming Stand Overload Protection |
Performance & Quality
Five rough forming stands spread the bend so strip edges are not overworked, protecting edge thickness for a full weld seam. This gradual closing is why the ZY16 forms thin-wall and coated strip reliably, with fewer edge-strain defects than mills using fewer, heavier passes.
Application
For Φ8-18mm tube where edge integrity and weld gap control matter, including thin-wall and galvanized strip that tolerate less over-forming.
Selection Guide
Choose this mill when your material is thin or coated and needs gradual forming to avoid edge damage. The five-stand rough stage is balanced with the three-stand precision stage for the full Φ8-18mm range.
Application Scenarios
Thin-wall and galvanized tube, small diameter precision tube, and any material prone to edge strain during forming.
FAQ
Q1. Why five rough forming stands?
Spreading deformation across five stands reduces edge strain and keeps the weld gap stable, unlike forcing the bend in fewer passes.
Q2. Does rough forming affect edge thickness?
Yes, gradual forming protects strip edge thickness so the weld seam has full material to fuse.
Q3. Is it matched to the precision stage?
Yes, five rough plus three precision stands divide the work so each stage handles an optimal share of deformation.
Q4. Can I skip a rough stand for some sizes?
The stand sequence is fixed, but roll profiles are set per size, so the deformation is balanced for each OD you run.
Q5. Does more forming stands mean more maintenance?
Each stand is individually set, but the even load distribution actually reduces wear and edge defects, so total maintenance stays manageable.
Q6. How are rough forming stands driven?
They are geared and driven in synchronization with the line, so deformation is distributed evenly across the five stands.
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