Tension Leveler for Aluminum Coil
Tension leveler for aluminum coil is dedicated processing equipment for aluminum strip continuous production lines. By applying combined tension and repeated alternating bending deformation, it redistributes internal residual stress of aluminum strip, removes various complex 3D flatness defects, and greatly optimizes surface flatness and comprehensive mechanical performance of aluminum plate.
It is commonly deployed on aluminum strip tension‑leveling lines and continuous annealing lines, serving high‑quality aluminum sheet production for rail transit, automotive, household appliance and building material sectors.
- Working Principle
- Tension stabilization
Inlet and outlet tension rolls build stable strip tension and suppress tension fluctuation. Tension value is further amplified by intermediate roll cluster, ensuring the aluminum strip stays under constant tensile status during the whole leveling process.
- Alternating bending deformation
Equipped with two groups of upper & lower bending assemblies. Running aluminum strip is subjected to cyclic positive‑negative bending. Residual deformation inside the strip gets evenly distributed, offsetting uneven longitudinal elongation across strip width, which is the root cause of most flatness imperfections.
- Final leveling correction
Subsequent leveling roll units implement final calibration. Internal stress field of aluminum strip tends to be uniform, delivering stable target flatness and enhancing material formability for subsequent stamping, bending and coating operations.
Tension leveler for aluminum coil eliminates typical aluminum strip flatness defects: unilateral wave, bilateral wave, center wave, two‑edge rib wave, camber, buckling and latent hidden shape defects.
During preceding rolling process, improper roll profile and roll‑gap deviation will bring uneven width‑wise longitudinal extension and disordered residual stress to aluminum coils. Tension leveling is an indispensable process to fix these defects before downstream manufacturing.
2.Key Technical Specifications
| Item | Parameter |
| Strip material | Aluminum strip / Aluminum alloy strip |
| Strip thickness | 0.2 4.0 mm |
| Strip width | 1250 2500 mm |
| Strip running speed | ≤500 m/min |
| Incoming strip flatness | ≤30 50I |
| Finished strip flatness | 3 5I |
| Application scope | Aluminum strip tension leveling line, continuous annealing line |
3.Main Mechanical Components (Two‑bending Two‑leveling, Single‑drive Structure)
| No. | Component Name | Qty. | Remarks |
| 1 | Machine Frame | 1 set | Heavy duty welded frame |
| 2 | Φ30 Bottom Bending Roll Units | 2 sets | Direct contact with aluminum strip for alternating bending |
| 3 | Φ30 Top Bending Roll Units | 2 sets | |
| 4 | Locking Device | 2 sets | Lock bending roll position during operation |
| 5 | Φ200 Top Straightening Roll Units | 4 sets | Back up support rolls (no direct strip contact), provide rigidity for working rolls |
| 6 | Bottom Lifting Device | 1 set | Adjust roll gap |
| 7 | Φ50 Anti-horizontal Bending Roll Units | 1 set | Prevent strip horizontal deflection & deviation |
| 8 | Φ70 Anti vertical Bending Roll Units | 1 set | Suppress vertical warping of wide aluminum strip |
| 9 | Roll change Device | 1 set | For quick roll maintenance & replacement |
4.Scope of Supply
Mechanical parts: Main machine of two‑bending two‑leveling tension leveler + roll‑change device. (Anchor bolts, valve stand and guide rails are excluded)
Electrical parts: On‑board wiring, terminates at main‑machine junction box.
Hydraulic parts: Hydraulic piping only; transmission‑side connecting interfaces reserved for customer‑supplied external hydraulic station.
5.Industrial Application
- Aluminum Metallurgy Production Lines
Core station for aluminum strip tension‑leveling recoiling lines and continuous annealing lines. It improves strip flatness before annealing, removes internal residual stress, lays foundation for high‑quality aluminum finished sheets.
- Rail Transit Industry
Produce high‑flatness large‑width aluminum alloy sheets for high‑speed railway, metro, tram and airport comprehensive transport hub construction. Wide aluminum panels for vehicle carbody require extremely uniform stress status after tension leveling.
- Automotive Manufacturing
Process aluminum blanks for automotive body panels, vehicle doors and roof components. Tension leveling avoids stamping cracking, surface ripple and spring‑back risks caused by uneven residual stress.
- Home Appliance & Building Material
Supply qualified leveled aluminum sheets for televisions, refrigerators, air‑conditioners, architectural decorative aluminum panels. Uniform flatness guarantees stable follow‑up painting and anodizing quality.
Conclusion
Aluminum coil tension leveler is not merely a flatness‑correcting device, but a stress‑homogenizing process unit for wide aluminum strip. For 0.2‑4.0 mm thickness, 1250‑2500 mm width aluminum strip, it optimizes incoming flatness ≤30‑50I down to finished flatness 3‑5I at maximum line speed 500 m/min. It is essential processing equipment for modern high‑grade aluminum sheet production.
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