As an authorised SweBend partner in the UK, we’re pleased to share news of another impressive custom machine delivery from SweBend: the JM-140 heavy-duty joggling machine, supplied to Spray Engineering, a sustainability-driven manufacturer of advanced process equipment.

The JM-140 has been engineered for pressure vessel cylinder production, using profiled rolls and 35 tons of forming force to roll stiffening grooves into heavy-wall cylinders. These grooves help strengthen the shell, improve roundness and enable the vessel wall to absorb pressure and thermal changes during operation.

The machine can also form stepped flanges at cylinder ends, allowing sections to be joined into longer pressure vessels. It handles mild steel up to 15 mm thick on cylinders from 1,000 mm to 5,000 mm in diameter.

SweBend is known for designing and building machines that solve forming challenges beyond the capability of standard equipment. For Spray Engineering, the requirement was to joggle heavy-wall pressure vessel cylinders, a specialist forming process used to create profiled grooves and stepped offsets in cylindrical shells.

When applied along the cylinder body, joggling creates circumferential stiffening grooves that reinforce the shell, improve roundness and help the wall accommodate pressure and volume changes caused by heat inside boilers and process vessels.

When applied at the cylinder ends, the same forming principle creates a stepped flange that allows two sections to overlap and be welded together into a longer vessel.

This makes the JM-140 a tailored forming machine with a dual purpose: strengthening the cylinder body and preparing cylinder sections for joining.

Spray Engineering focuses on advanced industrial process equipment designed to support energy- and resource-efficient production. Its boilers and process vessels operate under sustained thermal and pressure loads, making consistent forming accuracy and shell integrity essential.

The JM-140 reflects SweBend’s ability to engineer robust, application-specific solutions for demanding manufacturing environments. It also demonstrates a sustainable approach to equipment investment: machines built to last, adapt to evolving production needs and accept new tooling rather than being replaced.

• Joggling is a metal-forming process where profiled rolls press a stepped offset or groove into a cylinder. Along the cylinder body, this creates stiffening grooves that strengthen the shell, improve roundness and help absorb pressure and thermal changes. At the cylinder ends, it forms stepped flanges for joining sections before welding.
• The SweBend JM-140 is a heavy-duty joggling machine designed for pressure vessel cylinder production, using profiled rolls and 35 tons of controlled forming force.
• The machine handles mild steel up to 15 mm thick at 355 MPa yield, with cylinder diameters from 1,000 mm to 5,000 mm and lengths up to 2,500 mm.
• Application-specific profiled rolls can be changed as joggle profiles evolve, allowing the machine to adapt to future production requirements.

Accurate cylinder positioning is critical in joggling. Any misalignment can lead to uneven forming, inconsistent flange geometry and potential scrap.

The JM-140 features adjustable vertical support rolls to hold the cylinder in position, together with horizontal outboard support rolls to carry the cylinder’s weight during forming. This dual-support system keeps the workpiece stable throughout the process, helping improve repeatability and reduce operator intervention.

Every element of the JM-140 is designed for sustained heavy-duty operation. The forming roll delivers up to 35 tons of force at speeds of up to 15 m/min, driven by a 22 kW hydraulic system operating at 210 bar.

SKF bearings in all journals support long service life under continuous load, while the hydraulic drive with variable speed gives operators precise control over the forming process. Adjustable working pressure on the pinching roll allows fine-tuning for different plate thicknesses and flange geometries.

The JM-140 uses a dedicated control panel with push buttons and an emergency stop, providing straightforward operation without unnecessary complexity.

With a portable pendant control instead of a fixed station the operator can inspect and adjust the joggling process from any angle at different positions around the cylinder, removing blind spots and helping to maintain visibility and control throughout forming.

The forming rolls are application-specific, but the machine is designed to accept new roll sets as production requirements change. If new joggle profiles, vessel geometries or plate thicknesses are introduced, the tooling can be adapted without replacing the machine. This approach reflects SweBend’s wider philosophy: building robust, custom-engineered forming machines that support manufacturers over the long term.

For UK manufacturers facing complex plate, section or cylinder forming challenges, SweBend’s tailored machine solutions offer a proven route to improved capability, precision and production flexibility. As an authorised SweBend partner in the UK, we’re here to help customers explore the right forming solution for their application.

Machine: SweBend JM-140

Machine type: Tailored forming machine (heavy-duty joggling machine for pressure vessel cylinders)

Application: Rolling profiled grooves along cylinder bodies for strength, roundness and pressure absorption; rolling stepped flanges at cylinder ends for welding

Material: Mild steel up to 15 mm thickness at 355 MPa yield

Capacity: Cylinder diameter 1,000–5,000 mm; length up to 2,500 mm; forming roll force 35 tons; maximum speed 15 m/min

Customisation: Application-specific profiled forming rolls, interchangeable for different joggle profiles; adjustable cylinder positioning with outboard and vertical support rolls

Control: Dedicated control panel with push buttons, emergency stop and portable pendant control

Customer: Spray Engineering, manufacturer of advanced industrial process equipment