Four roll plate rolling machine and three roll plate rolling machine are two commonly used mechanical equipment in the metal processing industry. Their main function is to bend flat materials into cylindrical or arc-shaped shapes. Although both can complete the task of rolling the board, there are significant differences in their design principles, operating methods, and applicable scenarios. Below, we will explore in detail the differences between these two devices.

Design Principles and Structures

A three roll plate rolling machine usually consists of an upper roller and two lower rollers, where the upper roller can move up and down while the lower roller is fixed. The board is placed between two lower rollers and is bent and deformed by the pressure of the upper roller. Due to having only three roller shafts, the three roller plate rolling machine requires manual adjustment of the position of the sheet metal during operation to ensure that both ends of the sheet metal are in contact with the upper and lower rollers simultaneously, thereby ensuring the accuracy and quality of the rolling process.

The four roll plate rolling machine adds an additional upper roll on top of the three rolls, forming a more complex structure. This additional upper roller can not only move vertically but also horizontally, which allows the four roll plate rolling machine to better control the shape of the plate during the rolling process, reduce the distortion and deformation of the plate during the rolling process, and improve the accuracy of the rolling.

Operation mode and accuracy

Due to the simple structure and relatively easy operation of the three roll plate rolling machine, it is suitable for rolling small sheet metal. However, due to the possibility of asymmetric bending of the sheet during the rolling process, operators need to have certain experience and skills to adjust the position of the sheet in a timely manner during the rolling process to achieve the desired shape.

In contrast, the operation of a four roll plate rolling machine is more complex, but it provides higher accuracy. The additional upper roller can precisely control the bending degree of the sheet metal, reduce the twisting of the sheet metal during the rolling process, and is especially suitable for rolling longer or thicker sheets. In addition, the four roll plate rolling machine can also handle plates with pre bent edges without the need for additional pre bending processes after coiling, greatly improving production efficiency.

Applicable scenarios

The three roll plate rolling machine is more common in small and medium-sized enterprises or applications that do not require high-precision rolling due to its low cost and easy operation. For example, when making simple products such as oil drums and pipelines, a three roll plate rolling machine can meet the requirements.

The four roll plate rolling machine is more suitable for large enterprises or occasions with strict requirements for rolling accuracy, such as shipbuilding, aerospace industry, etc. Products in these industries often have larger sizes and thicker thicknesses, requiring extremely high precision and quality in the rolling process. At this point, the advantages of the four roll plate rolling machine can be fully utilized.

In summary, the choice between a three roll plate rolling machine or a four roll plate rolling machine mainly depends on the size, thickness, and precision requirements of the required rolled sheet metal. In practical applications, enterprises should choose the appropriate type of rolling machine based on their own product characteristics and cost budget, in order to achieve efficient and high-quality production goals.