Costly Downtime During Roll Changeovers
Every size change stops production, and on fixed-shaft mills operators must dismantle adjacent stands to reach a roll set. For mills running many φ10-26mm sizes in short batches, changeover time is the single biggest drain on output.
Why Conventional Roll Change Is Slow
Fixed-shaft designs require removing neighboring rolls to access the target set, and re-aligning the pass after every change is manual and error-prone. The longer the line sits idle, the more capacity is lost across frequent size runs.
The ZY20 Quick Change Tube Mill Solution
Forming and sizing stands use side-pull quick-change frames, so operators slide a roll set out and a new one in without dismantling adjacent stands.
Pre-aligned roll assemblies reduce re-alignment work, letting the line return to rated speed faster after each size change.
Combined with 42CrMo hardened shafts, quick change keeps maintenance and switch-over downtime to a minimum across short-batch production.
Technical Specifications of the ZY20 Tube Mill
| Parameter | Specification |
|---|
| Tube outside diameter | φ10–26 mm |
| Wall thickness | 0.4–1.5 mm |
| Rated production speed | up to 90 m/min |
| Raw material | HR / CR low-carbon steel, galvanized steel |
| HF welder power | 100 kW solid-state |
| Forming stands | 5 rough + 3 finish |
| Sizing stands | 6 horizontal + 6 vertical |
| Leveling rolls | 7-roll precision leveler |
| Cut length / precision | 4–8 m, ±3 mm |
| Coolant flow | ≥10 t/h spray + overflow pool |
| Roll shaft material | 42CrMo quenched & tempered + HF hardened |
Complete Continuous Production Process
Every ZY20 runs one continuous flow from coil to finished cut tube. An uncoiler feeds strip through a 7-roll precision leveler that removes coil-set, then double-radius forming shapes it in 5 rough and 3 finish stands without edge wave. A 100 kW solid-state HF welder fuses the seam under squeeze pressure with a dedicated seam guide, and an automatic outside-burr unit clears the bead immediately. ≥10 t/h spray plus overflow-pool cooling locks the shape, the 6-horizontal + 6-vertical sizing train sets the diameter, and a 4-roll Turk head straightens the tube before the microcomputer flying saw cuts 4–8m lengths to ±3mm. Overload-protected stands and 42CrMo hardened shafts keep the whole line stable over long runs.
Where the ZY20 Quick Change Tube Mill Is Applied
Producers running many small-diameter sizes in short batches who need to minimize changeover downtime and maximize uptime.
How to Select a Quick Change Tube Mill
Confirm your size-mix frequency, then check the roll-change mechanism — side-pull frames on forming and sizing stands cut changeover time. Verify pre-alignment to speed return to production.
Installation, Support and After-Sales
The ZY20 ships as a turnkey package with layout and foundation drawings so you can prepare the site before delivery. Engineer-led on-site installation and commissioning bring the line to rated output, with operator training to hand over a running mill. A one-year warranty with spare-parts support protects the investment, and because the line accepts HR, CR and galvanized coil, you can adapt to changing material costs and market demand without re-tooling.
Frequently Asked Questions About the ZY20 Quick Change Tube Mill
How does side-pull roll change work?
Roll sets slide out to the side and are replaced without dismantling adjacent stands.
Which stands have quick change?
Both forming and sizing stands use side-pull quick-change frames.
Does quick change affect accuracy?
No — pre-aligned roll assemblies keep the pass accurate after each change.
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