Sundwig 20 hi Reversible Cold Rolling Mill
Technical Introduction
This professionally revitalized used Sundwig 20 hi mill represents the pinnacle of precision foil manufacturing technology. Originally manufactured in 1988 and comprehensively upgraded, this Secondhand 20 hi Reversible Cold Rolling system delivers exceptional thin-gauge capabilities rivaling modern installations. Designed as an industrial-grade foil rolling machine, it processes exotic alloys to micron-level tolerances with fully revamped automation and control systems.
Core Specifications
| Parameter | Value |
|---|---|
| Model | WV 20 SHE |
| Max Width | 670 mm |
| Min Width | 300 mm |
| Max Speed | 500 m/min (≈730 m/min) |
| Max Coil Weight | 3 tons |
| Coil Dimensions | ID: Ø550mm / OD: Ø1150mm |
| Spool Size | ID: Ø400mm / OD: Ø550mm / L: 870mm |
| Roll Force | 140 tons (1,400 kN) |
| Stroke | 120 mm |
Material Thickness Range
| Material | Input (mm) | Output (mm) |
|---|---|---|
| Copper Alloys | 0.5-0.7 | 0.01-0.015 |
| Aluminum | 0.6-0.8 | 0.01-0.015 |
| Stainless Steel | 0.3-0.4 | 0.01-0.015 |
| Invar (FeNi36-78) | 0.3-0.4 | 0.01-0.015 |
| Molybdenum/Titanium | 0.25-0.4 | 0.01-0.015 |
Comprehensive Revamping Scope
Mechanical & Electrical Upgrades:
New AGC System: Pauly GmbH with X-ray thickness gauge + SPC statistical control
Drive System: ABB digital DC drives with torque stability ±0.5%
Control Platform: Mitsubishi Melsec Q3 PLC with HMI interface
Hydraulic Systems:
Servo-hydraulic units for AGC and 1st roll shifting (21 MPa operating pressure)
Schneider filtration (1,000 L/min flow rate)
Crown Adjustment: 7-set precision screw-down system
Roll Stack Configuration:
Work Rolls: Ø31×750mm / Ø65×750mm (hardened tungsten carbide)
1st Intermediate Rolls: Ø56×750mm / Ø41×750mm
2nd Intermediate Rolls: Ø101.5×750mm (x2)
Backup Bearings: Ø165×70mm (64 sets)
Technical Advantages
1. Unmatched Precision
Achieves 0.01mm foil thickness with ±0.5μm tolerance
7-point crown control maintains flatness ≤1.5 I-units
X-ray AGC provides real-time thickness correction (50 scans/sec)
2. Material Versatility
Processes specialty metals including:
Temperature-sensitive Invar (FeNi36)
High-strength titanium alloys
Electromagnetic Si steel
Corrosion-resistant Ta/Nb alloys
3. Productivity Features
Reversible Operation: Single-pass reductions up to 85%
Tension Control: 3-shift 84kW reels with automatic taper tension
Coolant System: Mineral oil circulation at 40°C ±2°C
Refurbishment Certification
Restored to Sundwig OEM standards:
Roll stack reconditioning with dynamic balancing (G1 grade)
Column realignment to ±0.003mm/m tolerance
Bearing replacement (FAG/SKF premium series)
Electrical rewiring to IEC 60204-1 safety standards
Validation test report: 72-hour continuous foil production
Industry Applications
| Sector | Use Case | Tolerance Requirement |
|---|---|---|
| Aerospace | Jet engine thermal shields | ±0.8μm @0.015mm |
| Electronics | Flexible printed circuits | Ra ≤0.1μm surface |
| Medical | Implantable device foils | 100% pinhole inspection |
| Energy | Battery current collectors | ≤0.5% thickness variation |
Operational Economics
| Metric | This Mill | New Equivalent |
|---|---|---|
| Capital Cost | $1.2M | $4.5M+ |
| Lead Time | 10 weeks | 18 months |
| Energy Consumption | 380 kW (peak) | 550 kW (peak) |
| Tooling Cost | $18,000/roll set | $45,000/roll set |
Service Package
Pre-Commissioning:
Material trials (up to 500kg provided)
Plant integration consultancy
After-Sales Support:
12-month comprehensive warranty
Remote diagnostics via VPN
Priority spare parts access (10-year guarantee)
On-site operator training (Sundwig protocol)
