Core Definition
A Sink Roll Forming Machine is a continuous cold roll forming system designed to progressively shape stainless steel coils (primarily 304/316 austenitic grades) into integral kitchen sink basins**. It achieves one-piece forming of the bowl, overflow holes, anti-splash rims, and radius corners, replacing traditional stamping and welding processes.
Core Functions & Technical Advantages
| Function | Technical Implementation | Value |
|----------------------------|-------------------------------------------------|----------------------------------------|
| Deep Drawing | 12-24 roller stages (depth: 80-220mm) | Eliminates thinning/cracking risks of stamping |
| Precision Radius Control| Gradual bending rollers (R3-10mm ±0.2mm) | Smooth corners for easy cleaning |
| Integrated Splash Rim | Vertical edge-forming rollers (height: 15-30mm) | No welding, zero leakage risk |
| In-line Punching | Hydraulic punching for overflow/drain holes (Ø30-120mm) | Eliminates secondary processing |
Core Process Flow
1. Uncoiling & Leveling
Servo decoiling + 9-roll leveling (eliminates coil stress; flatness ≤0.5mm/m)
2. Progressive Roll Forming
Stage 1 (Pre-forming): 3 sets of roughing rollers create shallow bowl profile
Stage 2 (Deep Drawing): 6-8 tapered rollers progressively increase depth
Stage 3 (Sizing): 4 finishing rollers calibrate radii and edge straightness
3. In-line Punching
Hydraulic punch synchronizes overflow holes (position accuracy ±0.3mm)
4. Flange Bending
Vertical rolls form 90°±0.5° countertop splash rim
5. Cut-to-Length
Servo-driven flying saw (length: 700-1200mm; burr ≤0.1mm)
Key Specifications
| Module |Technical Specifications |
|----------------------|----------------------------------------------------------|
| Forming Unit | 24 high-strength alloy steel rollers (hard chrome-plated; HRC≥60) |
| Drive System | AC servo motors + planetary gearboxes (total power: 55kW) |
| Punch Unit | 80-ton hydraulic press (quick-die-change ≤5min) |
| Control System | PLC + 10" HMI (stores ≥50 sink profiles) |
| Material Compatibility | 304 stainless (0.8-1.2mm), 430 ferritic stainless |
| Production Speed | 2-4 basins/minute |
Advantages vs. Traditional Stamping/Welding
|Metric | Roll Forming | Stamping/Welding |
|----------------------|------------------------------------------|------------------------------------|
| Material Utilization | ≥95% (no edge scrap) | 85-90% (blanking waste) |
| Strength Uniformity | 15% hardness increase (work hardening) | 20% strength loss in HAZ (welding) |
| Leakage Risk | Seamless monolithic structure | Corrosion-prone welds |
| Tooling Cost | Roll sets: ¥200-500K (life: 100K cycles)| Dies: ¥800K-1.5M |
Industry Applications
Residential Sinks: Single/double/tiered bowls (depth: 180-220mm)
Commercial Kitchens: Deep prep sinks (≥250mm; with drainboards)
Customization: Non-standard shapes (oval/pentagonal), undermount rims
Material Innovations Antibacterial SS (Cu-ion coating), sound-dampening back coatings
Technical Challenges & Solutions
1. Deep-Draw Cracking
Solutions:
Optimized roller path (draw ratio ≤2.0)
In-line food-grade lubricant spray
2.Surface Scratching
Solutions:
Mirror-polished rollers (Ra≤0.1μm)
Nylon guide guards
3. Radius Springback**
- Solutions:
- Overbend compensation (+0.3°-0.8°)
- Pressure-holding at final rollers
Audited Supplier 
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