July 16, 2026

Coil-to-coil tube unwinding-rewinding system

Coil-to-coil tube unwinding-rewinding system

Across industries involved in the processing of small-diameter tubes, particularly stainless steel tubing, manufacturers require specialized equipment capable of meeting increasingly demanding quality standards.

To achieve this goal, key inspection and treatment stages are now being integrated directly into production lines. These include furnace annealing to restore the material’s mechanical properties and non-destructive ultrasonic testing to verify weld integrity.

To ensure seamless continuity throughout the production process, Violi Macchine Srl has developed the new VM/I-ASB, a fully automatic coil-to-coil tube unwinding and rewinding system designed for integration into production lines. Besides significantly reducing operating costs and minimizing the risk of material damage, the system provides a modular platform that can accommodate heat treatment and quality control processes while maintaining continuous, accurate tube handling.

How does the VM/I-ASB coil-to-coil system work?

The process begins with the coil mounted on a mobile support that can be adjusted to accommodate different coil sizes while allowing both rotation and translation.

The tube is then smoothly guided through a series of adjustable rollers, with height and angle settings that ensure proper alignment before entering the traction unit. This unit has been specifically designed to move stainless steel tubing without damaging its surface. The tube then passes through the straightening section, where any residual curvature is removed.

Throughout the entire process, the tube travels at a constant, precisely controlled speed, ensuring ideal conditions for the intermediate processing stage. Once this phase has been completed, the system performs the same operations in reverse sequence, rewinding the finished tube onto a new coil.

The entire system is managed by an electromechanical PLC-based control system that coordinates every operating function. A sensor network continuously monitors tube speed, tension, and straightness, ensuring stable process conditions throughout the production cycle. Thanks to its modular design, the VM/I-ASB can be easily configured to meet different production requirements and integrated with a wide range of processing technologies.

For more information, please contact us at: marketing@violimacchine.it

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PlantsJuly 16, 2026
April 2, 2026

Tube unwinding and winding systems

Tube unwinding and winding systems – mod. VM/I-AST – VM/I-ASB

In the evolution of processing small-diameter stainless steel tubes, manufacturers have expressed the need to monitor critical quality stages. This includes proper annealing in furnaces, welds inspections and the detection of potential tube defects through non-invasive checks, such as ultrasonic testing.

To do this, the tube – originally supplied in coils or reels – must be unwound, straightened to pass through the machines for the required treatment, and then rewound into coil or reel. The entire process operates continuously.

To meet these needs, Violi Macchine has developed two types of systems: one for processing tube coils and one for tube reels.

These systems are the result of the ongoing research and development efforts of the Violi Macchine team and the constant focus on the end customer’s requirements. As a result, technologically advanced solutions have been created, designed to ensure high standards of quality and reliability.

The systems offer precise speed control across the different units, improving the final quality of both coils and reels.

The centralized control console is simple and intuitive; via touch panel it is possible to save and recall processing recipes.

The systems work on a wide speed range. They are versatile for different tube types, processing conditions, and production requirements.

Particular attention has also been paid to safety aspects: perimeter fences protect the working area, and each station is equipped with openable guards to access machines.

The systems are built in compliance with applicable European regulations.

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PlantsApril 2, 2026
September 24, 2024

New double automatic drawing plant with cut of worked bars

Violi company always stands out in the field of tubes drawing!

Violi drawing method has been recognised as a revolutionary system since the 1990s, because it uses hydraulic forces instead of traditional pulling systems. Using these tube drawing technologies, customers can get a good hardness of the material and resistance to wear and this consequently guarantees an excellent workability of the product in machine tools. This method takes significant increase in productivity, with a considerable reduction in the metal used and thus in the processing waste. Starting from this system, Violi designs and produces fully automatic and customized systems for the tube industry. The company is thrilled to enter this world by developing fully automatic drawing systems, starting with the selection of bars and ending with their storage after drawing. The new double automatic drawing plant Violi, is born thanks to the research and development of Violi patented technologies and thanks to the fine tuning of machines listening to the needs of customers that, for production requirements, needed a drawing bench with separate and independent stations.

The plant is composed of indipendent unwinders with indepentent cutting units with clamps for Wire cutting. Unique structure with double independent drawing pull with the possibility of drawing different diameters and lengths. One exclusive system that allows the start of the drawing in a gradual manner thanks to the programming of power and speed. The ejection of tubes is automatic. They are deposited via pick places in adjacent side warehouses without interruption of the cycle. All movements are carried out safely using sensors, Photocells and metal barriers. All working data can be adjusted via the Touch Panel or by remote control. The logic of the plant, in addition to determining all processing parameters, has the possibility of entering recipes and being able to recall them as necessary.

Technical details change according to customer requirements.

 

For more information contact: marketing@violimacchine.it

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PlantsSeptember 24, 2024