What is a Four Roll Plate Rolling Machine and How Does It Work?

A four roll plate rolling machine is an advanced piece of equipment used to bend and shape metal plates into cylindrical, conical, or custom curved components. It is widely used in industries such as pressure vessel fabrication, boiler manufacturing, shipbuilding, and steel structure production.

Structure and Working Principle

The machine consists of:

• One fixed upper roller

• One adjustable lower roller (driven)

• Two side rollers (movable)

The upper and lower rollers are both powered, providing strong and stable rolling force. The side rollers move diagonally under hydraulic pressure to create precise bending curves. The lower roller lifts the plate to pinch it against the upper roller, and the side rollers then shape the plate as it feeds through.

This configuration allows for pre-bending, rolling, and rounding to be completed in one operation—offering higher efficiency and accuracy compared to three-roll machines.

Key Features of LONGXU Four Roll Machines:

• Hydraulic double drive: Ensures strong rolling force for thick plates

• CNC or semi-automatic control: Improves precision and repeatability

• Forged, hardened rollers: Withstand high pressure and extend service life

• Movable operator panel: Easy control and flexible operation

• Overload protection & lubrication system: Ensures safety and low maintenance

Whether forming complete cylinders or partial curves, the four roll design is especially suitable for medium to heavy-duty plate forming tasks.