China GDF Dual-Spec Duct Flange Forming Machine - Top Suppliers for HVAC Factory Productivity

This equipment features 24 sets of rollers specifically designed to suit the cross-sectional characteristics of GDF profiles, with each set precisely positioned according to the GDF forming path. Unlike TDC flanging machines, which require flange strips to be formed separately and then riveted by hand, this machine continuously roll-forms GDF flange joints directly onto the edges of the sheet metal. The finished product emerges with fully riveted flanges, eliminating the need for secondary processing. The flange joints are flat and fit seamlessly with the corner brackets. The roller arrangement data accumulated by Liding in the field of GDF profile forming has been validated through actual production on over 2,000 machines worldwide.

GDF20 (0.6–0.8 mm) on the left and GDF30 (0.8–1.0 mm) on the right: the two sets of rollers are independently configured, sharing the same frame and motor. Switching between specifications requires only changing the feed side; there is no need to dismantle or reassemble the rollers. Compared to purchasing two separate machines, this solution reduces capital expenditure by 40 per cent, halves the floor space required and cuts maintenance requirements in half. The Liding team has specialised in cold-forming for 25 years, and this ‘shared frame, independent rollers’ design has been operating stably over the long term in customer factories across multiple countries.

The operational context of this equipment means that a PLC is not a necessary component. There is no requirement for flying shears, no servo-driven width adjustment, and no automatic memory for multiple specifications—sheets enter the equipment, undergo continuous roll forming, and are discharged directly, operating at a single, constant speed throughout. Consequently, traditional electrical control fully meets production requirements, aligning with the equipment’s process specifications whilst reducing the customer’s reliance on external PLC programmers. When the equipment is exported overseas, routine maintenance can be carried out by local electricians.

Both the side panels and the spindle have a diameter of 35mm, and the machine has a net weight of approximately 2,700kg. During continuous operation, the relative positions of the roller stations remain stable and do not shift due to prolonged stress—ensuring consistency in flange dimensions during mass production and significantly reducing the scrap rate. Liding’s core team has over 30 years’ industry experience; all equipment undergoes comprehensive testing prior to dispatch, and the entire product range is CE-certified. A 12-month warranty is provided, along with a 48-hour global technical response service; engineers can be dispatched overseas for on-site support.