4 Inch Pipe Bending Machine — DWCNC130

The DWCNC130 is a CNC automatic 4 inch pipe bending machine rated to Ø130 × 8 mm in carbon steel. Four-inch NPS pipe has an outside diameter of 114.3 mm, so this machine covers 4 inch pipe in both Schedule 40 and Schedule 80, with margin left over.

That margin matters. A machine rated exactly at 4 inch diameter will usually fall short on wall thickness — 4 inch Schedule 40 is 6.02 mm and Schedule 80 is 8.56 mm. Sizing the machine one step above the pipe is what lets you run both schedules on the same equipment.

Capacity on 4 Inch Pipe

Maximum centreline bend radius is 500 mm — roughly 4.4D on 4 inch pipe, covering the 3D and 4D radii used in most process and structural work. Minimum radius is [n] mm with mandrel tooling.

Stainless steel needs more bending force than carbon steel at the same wall. Schedule 40 stainless is within range; Schedule 80 stainless is marginal at this size. Send your material grade with the enquiry and we will confirm rather than guess.

Technical Specifications

Servo Feed and Rotation, Hydraulic Bend

Feed length and rotation plane are servo-driven and run from the stored program, holding ±0.1 mm and ±0.1°. These are the two motions where error accumulates across a multi-bend part, and automating them is what removes indexing scrap.

The bend axis is cylinder-driven with speed adjustable to 45°/sec. At 4 inch Schedule 80 the force required is substantial, and hydraulic drive delivers it at a fraction of the cost of an all-electric machine in this size class.

The control stores 500 part programs with up to 30 bends each. With a 3,900 mm feeding stroke and 5,600 mm effective mandrel length, the machine handles standard pipe lengths without pre-cutting.

Same Footprint, More Capacity

The DWCNC130 shares its bed, feeding stroke and overall dimensions with the smaller DWCNC114 — 7,500 × 1,300 × 1,550 mm in both cases. The difference is in the bending head, the 15 kW pump and the 9-tonne mass that reacts the load.

If your floor plan is already sized for a machine in this class, stepping up to 4 inch Schedule 80 capacity costs you no additional space.

Applications

Process and plant piping. Pipe spools, skid assemblies, compressed air and water services in 2 inch to 4 inch pipe.

Boiler and heat exchanger. Header bends, manifold runs and coil work.

Shipbuilding. Ballast, fuel and cooling lines routed around structure.

Structural and architectural. Handrails, balustrades, canopy frames, scaffolding, agricultural and construction machinery frames.

Tooling, Installation and Support

One complete die set for your specified OD and radius — bend die, clamp die, pressure die, wiper die and mandrel, with rod and linkage. Die sets are size-specific, so tell us every OD and radius you plan to run and we will quote the full package rather than the machine alone.

The machine is 7.5 m long and weighs 9 tonnes, and needs clear run-out at both ends for full-length pipe. Confirm floor loading and crane access before shipment. Installation and operator training are available on site or remotely; wear items ship from stock. Warranty is [n] months on the machine and [n] months on the control system.

Frequently Asked Questions

What diameter is 4 inch pipe?

114.3 mm outside diameter, regardless of schedule. Only the wall thickness changes between schedules, and the wall is what determines the bending force required.

Will this 4 inch pipe bending machine handle Schedule 80?

Yes in carbon steel. 4 inch Sch 80 is 8.56 mm wall, and at 114.3 mm diameter the required force sits within the Ø130 × 8 mm rating. For Schedule 80 in stainless, send us the grade and we will confirm.

Why is the machine rated at 130 mm if it is for 4 inch pipe?

Capacity ratings state the largest diameter at the stated wall. A machine rated at exactly 114 mm will typically be limited to a thinner wall than Schedule 40 requires. Rating one size above is what gives 4 inch pipe full schedule coverage.

Can it bend smaller sizes?

Yes, down to [n] mm with the appropriate die set. 2 inch and 3 inch pipe are common on this machine, including Schedule 80.

What is the tightest radius achievable on 4 inch pipe?

[n] mm centreline with mandrel tooling and correct wiper die setup, on suitable wall thicknesses.

How long is delivery?

Standard lead time is [n] working days after deposit and tooling confirmation.

Send your pipe OD, schedule, material grade, required bend radius and annual volume, and we will quote within 24 hours.