Shipbuilding

Rolling Power for the Maritime Industry

Q: How do Davi plate rolls manage the high-tensile, thick steel plates required for submarine hull fabrication?

Submarine construction demands the forming of thick, high-resistance materials (like HY-100 steel) while maintaining strict cylindrical tolerances for deep-sea structural integrity. Davi addresses this challenge with customized, heavy-duty 3-roll variable axis machines (MAV series) configured vertically to simplify material handling[cite: 1, 5]. Engineered with full mechanical and hydraulic symmetry, these machines distribute pressing forces evenly across the plate ends. This design minimizes structural deflection and delivers the extreme tonnage required to roll plates up to 120 mm (5") thick with precise geometric repeatability.

Q: What technology does Davi use to roll very wide, thin-to-medium plates for cargo ship and oil tanker hulls without deflection?

Rolling plates up to 24 m (78.7 ft) wide for large commercial vessels presents a major challenge: machine roll deflection, which causes inconsistent bending radii across the plate’s span. To solve this, Davi engineered the MAV SHB, a customized 3-roll variable axis machine utilizing a "press-roll" geometry supported by dedicated anti-deflection back-up rolls. Additionally, our 3-roll and 4-roll systems can be equipped with heavy-duty overhead and lateral hydraulic supports to manage the massive, sweeping shapes of these hull plates and prevent them from collapsing under their own weight.

Q: How does Davi ensure the precise bending of structural sections like bulb flats for deck stiffening?

Bending the asymmetrical profiles used in deck stiffening—such as single and double bulb flats—typically risks twisting, buckling, or surface damage to the material. Davi MCP 3-roll double pinch angle rolls feature universal, heat-treated, and deep-hardened rolls designed to handle extreme wear in shipyard environments. To prevent profile deformation, the machines utilize a specialized "all-rolls-drive" system with three independent hydraulic motors paired with the patented iRoll Camera System. This system provides real-time digital templates to continuously monitor bending accuracy.

Q: How does the iRoll eXtreme CNC system assist operators when rolling complex, multi-radius geometries for ship bow and stern sections?

Forming the complex, non-symmetrical, and multi-radius geometries of a ship's bow or stern usually requires highly skilled operators and time-consuming manual steps. The Davi iRoll eXtreme CNC solves this by using a self-adjusting AI database to automatically generate optimal multi-pass programs based on material characteristics. Operators can input complex geometries segment by segment, and the real-time Correction.

Plate rolling and profile bending play a crucial role in the naval and ship repair industry. Davi provides the precision and versatility required to roll components for the construction and maintenance of vessels, from massive cargo ships to high-resistance submarines.

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Section Bending

Stiffening and Decks

Davi angle rolls are used for bending bulb flats and other sections used in decks and stiffening components.

Bulb Bending

Specialized rolls for bending single and double bulbs (both "leg in" and "leg out").

Quality & Resistance

Rolls are heat-treated, deep-hardened, and wear-proof to ensure longevity in shipyard environments.

iRoll Camera System

A patented system to check multi-radius shapes with accuracy during the bending process.

for Every Vessel Type

Tailored Solutions

The shipbuilding industry encompasses a wide range of applications, each requiring specific bending capabilities.

Cargo Ships & Oil Tankers

These projects focus on extreme width rather than thickness. Davi provides plate rolls up to 24 m (78.7 ft) wide, managing thicknesses typically up to 30-40 mm (1" 1/5 - 1" 2/3).

MAV SHB

The Giant for Shipbuilding Geometry

For highly specific components, a 3-roll variable axis plate roll with a customized geometry. This system is based on a "press-roll" design where the top roll acts like a press brake punch.

- Variable Roll Geometry: Independent movement of the side rolls allows for faster and easier forming of complex radii.

- Anti-Deflection Technology: Dedicated geometry and back-up rolls compensate for roll deflection, ensuring accuracy across very long spans (up to 24,000 mm / 78.7 ft).

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