Problem
Roller shafts that bend under load or wear quickly change the roll gap and profile, so the mill drifts out of tolerance and produces inconsistent tube over time.
Cause
Ordinary carbon steel shafts deflect under forming load and wear at the bearing and roller seats, gradually altering roll alignment and tube geometry during long runs.
Solution
The ZY16 roller shafts are made from 42CrMo high-strength alloy steel, heat-treated for hardness and toughness, so they resist deflection and wear under sustained forming load. Stable shaft geometry keeps roll gaps consistent, extending tooling life and maintaining Φ8-18mm tube tolerance over long, high-speed campaigns.
Key Engineering Data
- 42CrMo alloy steel, heat-treated for hardness and toughness.
- Resists deflection under sustained forming load.
- Wear resistance keeps roll gaps consistent over long runs.
- Extends shaft and roller life, reducing correction downtime.
| 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
42CrMo shafts resist deflection and wear under sustained load, so roll gaps stay where they were set. This keeps Φ8-18mm tube within tolerance across long, high-speed campaigns and extends tooling life, reducing the roll corrections and downtime that eat into output. Heat-treated for hardness and toughness, the shafts balance rigidity with shock resistance, so they survive both continuous running and the occasional overload without bending or cracking. That stability means the tube coming off the line at the end of a long campaign still measures the same as the first coil.
Application
For Φ8-18mm tube production where consistent geometry over long, high-speed runs and long tooling life reduce downtime and rework.
Selection Guide
Choose this mill when you run long production campaigns and need stable geometry with minimal roll adjustment. 42CrMo shafts pair with double-radius rollers for the best precision.
Application Scenarios
High-volume tube runs, high-speed production, and precision tube where dimensional drift and frequent roll adjustment are unacceptable.
FAQ
Q1. Why use 42CrMo for roller shafts?
42CrMo alloy steel is heat-treated for strength and wear resistance, so shafts resist deflection and keep roll geometry stable.
Q2. Does it extend tooling life?
Yes, wear-resistant shafts reduce roll movement and drift, extending the life of both shafts and rollers.
Q3. What maintenance is needed?
Normal lubrication and periodic gap checks; the 42CrMo shafts need less frequent correction than carbon steel shafts.
Q4. Is 42CrMo standard on the ZY16?
Yes, 42CrMo high-strength shafts are standard, paired with double-radius rollers for stable high-speed forming.
Q5. How often do I need to check roll gaps?
Less often than with carbon steel shafts, because 42CrMo resists deflection; periodic checks and lubrication are usually enough.
Q6. What lubricant is used on the shafts?
Standard mill bearing grease is used; we provide a lubrication schedule with the commissioning documents.
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