Glossary
1 MIN READ
All-Rolls-Drive
A technology where every roll is equipped with its own independent motor and gearbox, ensuring optimum torque transmission, synchronized speeds, and a minimized risk of material slippage.
Technical FAQ
Heavy industrial manufacturers need the flexibility to form a wide range of extreme thicknesses and tight diameters on a single piece of machinery. A 3-roll variable-axis machine operates with a top roll that moves vertically, while the two lower side rolls move independently along a horizontal plane. This geometry allows you to increase the horizontal interaxis distance to gain massive mechanical leverage for thick plates, or narrow it to form tight, thin-walled cylinders. The Davi MAV line features full horizontal and vertical axis mobility, offering versatility comparable to a press brake but with total rolling precision.
Structural fabricators need to curve heavy beams and profiles accurately without manually turning the part around, which slows down operations. A 3-roll double pinch configuration features two independently moving side rolls that adjust against a fixed top roll. This allows the machine to execute precise pre-bending on both the leading and trailing ends of structural profiles in a single directional pass, drastically reducing part handling time. Davi MCP angle rolls utilize this double-pinch planetary geometry to process heavy structural sections with high accuracy.
Plate slippage during the initial pre-bending phase can ruin polished surfaces and compromise operator safety. All-rolls-drive technology equips every roll with its own independent motor and high-torque flat gearbox, instead of relying on friction from a single driven roll. It ensures optimum torque distribution, completely eliminates the risk of plate slippage, and guarantees accurate material feeding even on thin or polished materials. Davi builds all-rolls-drive as a standard feature across its high-performance plate and angle rolling systems.
Reducing the straight flat end on thick plates requires moving the bending rolls as close to the pinching point as possible. A flat gearbox features an eccentric rotation axis that avoids physical interference between hydraulic motors and the top roll cylinder shaft. It allows the side rolls to travel closer to the top roll (minimum gauge), achieving an exceptionally short flat end without compromising machine frame capacity. Davi exclusive flat gearboxes are a core component in achieving precision pre-bending on variable-axis machines.
Large-scale corporations require risk mitigation against extended downtime caused by long lead times for custom heavy components. Instead of a single custom gearbox, a multi-gearbox configuration connects multiple standard gearboxes to a heavy-duty reduction gear driving the top roll. If one gearbox component fails, the machine can continue operating at a reduced torque level, eliminating catastrophic production downtime while replacement parts are sourced quickly from standard stock. Davi implements this design on machines with pressing capacities exceeding 3,000 tons to protect large-scale infrastructure projects.
Changing out heavy section bending tools manually increases operator fatigue and creates safety risks on the shop floor. A hydraulic rolls setup automates the adjustment and configuration of the profile tooling via the control console. It reduces setup times when shifting between different production batches and improves operator safety by eliminating heavy manual handling. Davi includes smart hydraulic setup options across its mid-to-high capacity MCP angle rolling lines.