A tube mill machine is a set of stations that only works if they are matched: the mill sets the section, the welder joins it, the saw cuts it, and any one of them out of step shows up as scrap. We build the mill, the roll tooling and the cut-off, so the match is our problem rather than yours.
Machine Range
- HG16 to HG219 single-line machines for small and medium tube.
- HG355 for large diameter pipe up to ø355 mm.
- Square and rectangular tube configurations on the same mill.
- Single stations for mills already in production.
Each machine is assembled, aligned and run before shipment, with drawings and commissioning support. Tell us the tube sizes and the output per shift and we will size the machine to the job.
Five Numbers Separate One Tube Mill Machine From Another
The word covers everything from a mill making 8 mm furniture tube to a 355 mm structural line. What separates them is not the frame casting but stand count, shaft diameter, motor power, speed range and cut-off type. Reading those five tells you more about a machine than any brochure photograph.
What the Model Number Means
| Model | Working OD range | Typical product |
|---|---|---|
| HG16 | 8 to 16 mm | Instrumentation, furniture, small conduit |
| HG32 | 16 to 32 mm | Furniture, shopping trolley, exhaust |
| HG50 | 32 to 63.5 mm | Furniture, scaffold, light structural (OD 63.5 mm case) |
| HG76 | 50 to 76 mm | Structural, water pipe, general engineering |
| HG114 | 76 to 114 mm | Structural, fluid pipe, mechanical tube |
| HG165 | 114 to 165 mm | Heavy structural, piling, process pipe |
| HG219 | 114 to 219 mm | Large structural, line pipe, pile casing |
| HG355 | 165 to 355 mm | Heavy structural, large OD line pipe, piling |
The ranges overlap on purpose. A mill can be tooled above its nominal size on light wall and below it on heavy wall; the model number is the size the frame, shafts and drives were designed around, not a hard limit.
The Stand: Cast, Fabricated or Bolted
A cast stand is rigid and keeps its geometry for decades, and it is expensive to change. A fabricated steel stand is lighter and cheaper and can be built in any size, but it depends entirely on how it was stress-relieved and machined. A bolted stand is a compromise that works when the bolts are large, the joint faces are machined and nobody re-shims it in the field.
On a mill that runs heavy wall, stand rigidity shows up as surface marking and size drift within a shift. On thin wall it shows up as edge wave that will not tune out. Either way, the fix is not more pressure on the screws.
Shaft Diameter Sets the Wall Thickness Ceiling
The roll shaft deflects under load, and the deflection goes straight into the pass. As a working guide: a 32 mm tube mill uses 40 to 50 mm shafts, a 114 mm mill uses 80 to 90 mm, a 219 mm mill 110 to 130 mm, and a 355 mm mill 150 mm and up. A mill offered with shafts at the bottom of its band will run thin wall well and struggle the moment the order book moves to heavier tube.
Motor Sizing and Speed Range
Forming power scales with thickness squared and with speed, so a small increase in wall on a large diameter is a large increase in kW. Typical installed power runs 30 to 60 kW for a small line, 90 to 160 kW for a 114 mm line, and 400 to 700 kW for a 355 mm line including the welder, the drives and the hydraulics.
Speed range matters more than top speed. A mill that runs 20 to 60 m/min covers most of an order book; a mill that only runs flat out at 90 m/min is a single-product machine. Ask for the turndown ratio and check that the gearbox and the DC or AC drive actually deliver it at full torque.
Cut-off: Saw, Cold Saw or Shear
- Flying cold saw — square, burr-free ends at line speed, no heat-affected zone. The default for anything that will be threaded, welded or coated downstream.
- Friction saw — cheap to buy, fast on thin wall, but it burns the end and leaves a burr that costs more to remove than the saw saved.
- Flying shear — fastest on small tube, deforms the end, needs a trim operation afterwards.
Alignment Is the Job Nobody Budgets For
Pass line straightness of the order of a few hundredths of a millimetre per metre is what the mill needs, and it is set once, at erection. Foundation quality, shim quality and the decision to re-check after three months of production decide whether the mill still holds size in year two. A mill that drifts is usually a mill on a foundation that moved, not a mill with a bad design.
A Maintenance Schedule That Prevents Size Drift
| Interval | Task |
|---|---|
| Every shift | Check coolant flow and temperature, hydraulic pressure, air pressure, weld power reading against the setting sheet |
| Weekly | Inspect roll surfaces for pick-up and wear bands, check shaft end play, clean the impeder housing |
| Monthly | Check pass line with a laser or wire, measure a sample tube at four points, inspect saw blade run-out |
| Quarterly | Change hydraulic filter, check gearbox oil, re-torque stand bolts, verify drive tuning |
| Annually | Re-level the mill, inspect foundations and anchor bolts, recalibrate the welder, review roll wear against the original profile |
Most mills that “lose size after the first hour” are not failing at the design level. They are failing one of the weekly items above, and the cost of catching it early is a wipe-down and a gauge, not a roll set.
From the Knowledge Centre
- Why a Tube Mill Loses Size After the First Hour
- Reading Roll Wear: When to Resharpen and When to Replace
Related Products
Looking for something close to this? ERW tube mill line · Roll tooling · Flying cold saw · Spare parts.
