Plieuse hydraulique à 4 rouleaux

The metal plate is fed into the machine and clamped between the top and bottom rolls. The two side rolls then move upward to bend the plate into the desired shape by applying pressure at specific points, enabling accurate pre-bending and rolling without removing the sheet. The synchronized movement of the rolls ensures a consistent curvature throughout the plate.

Key components include the top roll (for initial clamping and forming), bottom roll (usually adjustable for clamping force), two side rolls (for bending and shaping), the main machine frame, hydraulic cylinders or motors for movement, and a control system (manual or CNC) for precise operation. Some machines also feature feeding tables and material supports.

A 4 roll machine allows for full pre-bending at both ends of the plate without removal, which minimizes flat ends and improves product quality. It also simplifies the loading and bending process, especially for larger or thicker materials, and is more suitable for CNC automation, increasing productivity and accuracy.

These machines can bend a wide variety of metals, including mild steel, stainless steel, aluminum, brass, and titanium alloys. The material type, thickness, and yield strength will determine the machine size and roll power required for effective bending.

The bending radius is primarily controlled by adjusting the position of the side rolls. By increasing or decreasing the gap and pressure between the rolls, operators can achieve tight or wide radii depending on the thickness and properties of the material being bent.

Yes, 4 roll machines can produce both cylindrical and conical shapes. To form a cone, one side roll is positioned higher than the other, causing the plate to bend at an angle and roll into a tapered shape as it passes through the machine.

Regular maintenance includes lubricating the bearings and moving parts, checking hydraulic fluid levels, inspecting hoses and seals, and ensuring the rolls are free from surface damage or wear. Scheduled checks of electrical and control systems also help prevent unexpected downtime and extend machine life.

Modern 4 roll machines are equipped with emergency stop buttons, interlocked guards, pinch-point protection, foot pedal controls, and overload sensors. Some machines also have visual or audio alarms and automatic shut-off functions in case of abnormal operation.

Material is usually loaded horizontally using cranes, forklifts, or feeding tables. Once the plate is aligned with the bottom and top rolls, it's clamped in place and automatically guided through the machine during the rolling process, minimizing manual handling.

4 roll machines offer high precision and repeatability, especially when CNC-controlled. They can achieve very tight tolerances, consistent radii, and high-quality finishes, making them ideal for applications requiring exact dimensions and minimal variation between parts.