Final Size and Roundness Control After Welding
The weld does not finish the tube — the sizing section does. Without enough sizing stands and a final straightener, welded tube leaves the line oval, bowed or off-diameter, and fails the dimensional checks that precision and structural buyers require.
Why Tubes Leave the Mill Out of Round
A welded body carries residual heat and stress that pull it out of round unless it is progressively resized. Too few sizing stands or no final straightener lets ovality and bow persist, and the tube reaches the saw already off-spec.
The ZY20 Sizing Tube Mill Solution
A 6-horizontal + 6-vertical sizing train progressively controls the finished diameter and roundness after welding.
A 4-roll Turk head with up-down, left-right and rotation adjustment straightens the tube and guides it accurately into the flying saw.
The combined sizing and straightening deliver a stable, round, straight finished tube ready for cutting at up to 90 m/min.
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 Sizing Tube Mill Is Applied
Precision, structural and furniture tube where final roundness and straightness determine whether parts assemble and finish correctly.
How to Select a Sizing Tube Mill
Check the sizing stand count — the ZY20 uses 6 horizontal + 6 vertical stands — and confirm a Turk head straightener is included for roundness and straightness before the saw.
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 Sizing Tube Mill
How many sizing stands does the ZY20 have?
6 horizontal + 6 vertical stands for progressive diameter control.
What does the Turk head do?
It straightens the tube with up-down, left-right and rotation adjustment before the saw.
Does sizing improve roundness?
Yes, the multi-stand train plus straightener keep the finished tube round and straight.
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