Tight Tolerance Demands in Precision Tube Production
Precision tube users in mechanics and furniture demand OD, wall and roundness held to narrow bands, and reject parts the moment a mill drifts. Small-diameter φ10-26mm tube is especially unforgiving because a tiny pass error or weld offset shows up as a large percentage of the diameter.
Why Small-Diameter Precision Tube Loses Accuracy
Conventional single-radius passes concentrate bending at the edge and produce waviness, while a seam that is not positively guided welds off-center and shifts the OD. Worn roll shafts and uneven cooling then let roundness and diameter creep, so the line falls out of tolerance within days.
The ZY20 Precision Tube Mill Solution
Double-radius pass design with 5-stand rough and 3-stand finish forming shapes the strip progressively to eliminate edge wave before welding.
42CrMo roll shafts, quenched, tempered and high-frequency hardened, hold the pass profile stable, while dedicated seam guidance centers the weld for accurate OD.
A 6-horizontal + 6-vertical sizing train plus a 4-roll Turk head trim the body to tight roundness, and the microcomputer flying saw cuts 4-8m to ±3mm.
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 Precision Tube Mill Is Applied
Precision mechanical tube, automotive light-gauge parts, furniture and structural sections where OD, wall and roundness must stay within narrow bands.
How to Select a Precision Tube Mill
State your OD, wall and roundness targets first, then match the φ10-26mm / 0.4-1.5mm window. Confirm material grade and cut-length precision, and review the foundation drawings to size the line for your tolerance requirements.
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 Precision Tube Mill
What roundness can the ZY20 hold?
The 6+6 sizing train and Turk head keep the body round and stable at rated speed.
How is OD accuracy maintained over time?
42CrMo hardened roll shafts resist wear so the pass profile stays true across long campaigns.
What cut precision does the flying saw deliver?
4-8m lengths cut to ±3mm with a microcomputer-controlled flying saw.
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