MCA - Four Roll

DAVI MCA - 4-ROLL PLATE BENDING MACHINE

Whenever repeatability, productivity and ease of use are of essence, the 4-roll is the technology of choice. In a 4-roll machine, latest development of the rolling technology, the bottom roll clamps the plate guaranteeing a perfect control over its position throughout the whole forming process. The side rolls, actuated by the unique DAVI planetary guides technology, provide the necessary bending force achieving the tightest diameters per capacity on the market (1.1 of the top-roll) obtaining the highest accuracy thanks to the perfect parallelism offered by the patented Servo-Tronic© system. Compared to other technologies, 4-roll machines stand out for allowing fully CNC-automated production processes, significantly decreasing the reliance on operators’ skills and, hence, making it the most suitable tech for mass-production.

Tightest Achievable Diameters thank to Planetary Guides
The bending power of a 4-roll machine is exerted to the plate by two side rolls.  Unlike other solutions on the Market, DAVI exclusive design provisions a planetary actuation of the side rolls whereas, rather than being guided up and down, the mechanism rotates around a pivoting point. Thanks to this system: maximum performance thanks to force multiplier effect by leverage arm (distance between pivoting point and cylinder force application point); reduced top-roll deflection due to circular force application; forming the tightest diameters thanks to favorable geometry (with side rolls wrapping around small diameters cans).

Best Rolls Parallelism thanks to Patented SERVO-TRONIC System
The rolls movement is actuated by hydraulic cylinders installed at the two ends of the machine. The patented Servo-Tronic© system, actuated by DAVI exclusive and fast-responding roll-by-wire control system architecture, guarantees the machine’s rolls parallelism at all times thanks to its dual, independent but integrated, parallelism control system. This system features dedicated pumping groups and circuits guaranteeing that each cylinder receives oil at the very same pressure and mass flow, with electro-valves for fine-tuning only. This way, even in case of electronics failure, the rolls parallelism is hydraulically and mechanically maintained and the machine can keep operating with excellent results. The Servo-Tronic© allows for: maximum accuracy of the rolls positioning; limited reliance on electronics with reduced downtimes in case of its failure; best geometrical tolerances on the workpiece; automatic compensation for unbalanced loads.