Roller Burnished Tube | Rolling Process & Cylinder Uses

Roller burnished tube is easy to recognize once you know what you are looking at: a bore that is not just smooth but almost glassy, with a slight sheen. That finish is not cut — it is pressed. Roller burnishing cold-works the surface of the bore, and for cylinder barrels it delivers a combination of finish, speed and surface hardness that machining alone cannot match.

What Is a Roller Burnished Tube?

A roller burnished tube — also called a rolled tube — is a tube whose bore has been finished by pressing hardened rollers against the surface under high load. The process does not remove material; it displaces it. The peaks of the machined surface are pressed down into the valleys, leaving a smooth, dense, work-hardened layer.

How Roller Burnishing Works

The burnishing head carries rollers that ride over the bore surface as the tube turns or the head travels. The load is high enough to deform the steel plastically, not elastically. Three things happen at the surface: the roughness peaks flatten, the surface pores close, and the material just beneath the surface gets harder from cold working.

Because nothing is cut, there are no chips to handle, no coolant swarf to dispose of, and no tool wear in the usual sense. The pass is fast, which is why burnishing shows up wherever barrels are made in quantity.

Benefits of Roller Burnishing

Surface finish — bores routinely reach Ra 0.1–0.2 µm, as good as or better than honing.

Harder surface — the cold-worked layer resists wear and galling in service.

Lower friction — the burnished surface runs seals cooler and longer.

Speed — burnishing is a quick pass, ideal for mass production.

No chips — a cleaner process with less cleanup and fewer coolant problems.

Rolled vs Honed vs Skived Tube

Factor	Roller burnished	Honed	Skived
Material removal	None (displaces)	Small amounts	Heavy, in one pass
Surface finish	Ra 0.1–0.2 µm typical	Ra 0.2–0.4 µm typical	Rougher, needs follow-up
Surface hardening	Yes	No	No
Speed	Fast	Slowest	Fast
Best role	Production finishing	Finest geometry	Stock removal

Applications of Roller Burnished Tube

Hydraulic cylinder barrels — especially high-cycle production lines — pneumatic cylinders, shock absorber tubes, pump barrels, bearing seats and any bore where a low-friction, wear-resistant surface pays off. Roller burnished barrels are also a favourite in the skive-and-roller-burnish (SRB) combination, where the tube is cut and finished in one machine, as on Tengye's 9-metre SRB line.

When to Specify Roller Burnished Tube

If you are producing cylinders in volume, roller burnishing is usually the economical choice: fast, chip-free, and it gives you a harder surface than honing. If your design needs the absolute tightest geometry correction — for example, correcting an out-of-round bore from another operation — honing still has the edge. For most cylinder barrels, though, rolled is plenty and cheaper to run.

FAQ

Q: Does roller burnishing remove any material?

No. It displaces the surface peaks into the valleys, which is why the bore size changes only by microns and the surface gets denser.

Q: Is a burnished bore better than a honed one?

For friction and surface hardness, generally yes. For correcting geometry errors, honing is better. The right answer depends on your starting tube and your specification.

Q: What Ra can a rolled tube achieve?

Typical production results are Ra 0.1–0.2 µm. Confirm the actual value with the supplier, because it depends on the pre-machined surface and burnishing parameters.

Q: Can rolled tube be used directly in a cylinder?

In most cases yes — the bore is finished and ready for the piston and seals, which is why SRB-processed barrels go straight to assembly.

Ask Tengye Machinery about roller burnished tubes and SRB barrels for your production line — +86 18912360300.