The CNC arc four-roll plate rolling machine is an advanced metal plate rolling equipment that integrates CNC technology with the unique structure of arc four rolls, enabling efficient and precise rolling of metal plates into various shapes.

Structural Composition

Roll System

It usually consists of an upper roll, a lower roll and two side rolls. The upper roll is generally fixed and can rotate in both forward and reverse directions; the lower roll can perform vertical linear movement to clamp the plate. Driven by oil cylinders, the two side rolls can slide up and down along linear guide rails to assist in adjusting the plate posture and controlling the bending radius.

Drive System

Hydraulic drive is mostly adopted, which features high transmission efficiency and large torque.

CNC System

It is equipped with a PLC (Programmable Logic Controller). Operators can input parameters such as plate size, material and rolling shape through the human-machine interface, and the CNC system automatically controls the movement of the rolls based on these parameters to realize an automated rolling process.

Machine Body Structure

The machine body adopts an all-steel welded structure and undergoes vibration aging treatment to eliminate internal stress, ensuring the stability and precision of the equipment during long-term high-intensity operation.

Working Principle

Place the plate between the upper and lower rolls, and adjust the side rolls to the appropriate angle to ensure the alignment of the plate edges. The lower roll moves upward to clamp the plate between the upper and lower rolls, then one side roll rises to pre-bend the plate. After pre-bending, the other side roll continues to act, and in cooperation with the rotation of the upper and lower rolls, the plate is gradually rolled into a circle. During the rolling process, the bending radius of the plate can be precisely controlled by adjusting the upper roll pressure and side roll angle, ultimately rolling the plate into the required arc or cylindrical workpiece. Circle calibration is completed by the joint action of the two side rolls after rising and the upper roll.

Features and Advantages

High-precision Rolling

The four-roll design can automatically center the plate, reducing manual adjustment and avoiding plate deviation, which is especially suitable for the processing of long plates. Meanwhile, it has strong pre-bending capacity and can complete the pre-bending of both ends of the plate without turning it around, ensuring the overall consistency of the rolled circle and a higher roundness of the finished product.

High-efficiency Production

It can complete processes such as pre-bending, round rolling and circle calibration in one operation. Compared with three-roll plate rolling machines that require multiple adjustments to complete the same operation, it greatly saves time, improves production efficiency and is suitable for mass production.

Material and Cost Saving

Precise pre-bending can avoid material waste at the plate ends and reduce material loss. In addition, the four rolls bear force in a more uniform way with coordinated stress distribution, making the motor load more stable. Long-term use can achieve energy consumption optimization and cost saving.

Strong Adaptability to Complex Processes

Variable curvature rolling can be easily achieved by adjusting the side roll pressure. It can process various complex-shaped workpieces such as conical and elliptical parts, and can also handle thicker or high-strength materials such as stainless steel and alloy steel.

High Automation and Safety

It is easy to integrate with the CNC system to realize automatic control and reduce manual intervention. At the same time, the plate is fixed by multiple rolls, reducing the risk of manual operation. Moreover, the equipment is usually equipped with safety devices such as overload protection and emergency stop buttons, making the operation safer.

Application Fields

It is widely used in industries with high precision requirements for arc workpieces, such as the pressure vessel industry for rolling cylindrical shells of boilers, storage tanks and heat exchangers; the engineering machinery industry for producing arc-shaped shells of cabs and hydraulic cylinder blocks for excavators and cranes; the chemical and petrochemical industry for manufacturing corrosion-resistant arc workpieces such as reaction kettles and pipe elbows; and the wind power and nuclear power industry for rolling segmented cylinder sections of wind power towers and large arc structural parts of nuclear power equipment.