How to Calculate Motor Power for Plate Rolling Machines – A Practical Tutorial

Calculating the motor power required for a Blechwalzmaschine involves considering several factors related to the bending process, including the material type, thickness, width, and desired bending force. Here’s a general method to calculate the motor power:

6 Steps to Help You Calcalate Plate Rolling Machine Power

Determine the Bending Force:

The bending force required depends on the material’s tensile strength, thickness, and width, as well as the desired radius of curvature.

Use the formula: Bending Force (F) = Width (W) × Thickness (T) × Tensile Strength (σ) × Bending Factor

The bending factor depends on the material type and the radius of curvature. For example, for mild steel with a radius of curvature equal to the plate thickness, the bending factor is typically around 0.33.

Calculate the Torque Required:

Torque (T) = Bending Force (F) × Roller Diameter (D) / 2

The roller diameter is the effective diameter of the roller used for bending.

Determine the Rotational Speed of the Roller:

The rotational speed of the roller is determined by the desired linear speed of the plate through the rollers and the roller’s diameter.

Linear Speed = Roller Diameter × π × Rotational Speed

Rotational Speed = Linear Speed / (Roller Diameter × π)

Calculate the Power Required:

Power (P) = Torque (T) × Rotational Speed (ω) / 9550

The factor 9550 converts the torque from Nm to kW.

Factor in Efficiency and Safety Margin:

Consider the efficiency of the motor and transmission system, typically around 85% to 95%.

Add a safety margin to account for variations in material properties, friction, and other factors.

Select a Motor:

Based on the calculated power, select a motor with a power rating slightly higher than the calculated value to ensure sufficient torque and performance.

Consider the motor’s speed, voltage, and other specifications to ensure compatibility with the plate rolling machine.

Consult Manufacturer Recommendations:

Check the manufacturer’s specifications and recommendations for motor power requirements for the specific plate rolling machine model.

It’s essential to perform these calculations accurately to ensure that the motor provides adequate power for the bending operation without overloading or underperforming. Additionally, consulting with a qualified engineer or the Blechwalzmaschine manufacturer can help ensure the proper selection of motor power for specific applications.