The need for pre-bending in plate rolling machines

As a manufacturing company specializing in the research and development of plate rolling machine equipment, we are well aware of the importance of the pre-bending process in plate forming. With more than 10 years of technical experience, the following for you to analyze why the coiler pre-bending is an essential step.

1. What is pre-bending? How does it work?

The pre-bending function of the coiler refers to a certain degree of pre-bending of the plate before processing by the coiler, which bends the plate through the pre-bending rollers to make it flatter when it is rolled and avoid problems such as deformation and warping, so as to achieve better molding results.
Brief description of the working principle:
(1) Reasonably adjust the parameter settings of the rolling machine according to the material, thickness and required molding angle of the plate.
(2) Ensure that the plate remains stable in the pre-bending process to avoid sliding or offsetting phenomena.
(3) closely observe the deformation of the plate, adjust the pre-bending strength and speed in a timely manner to obtain the best pre-bending effect.

2. Why roll the plate before pre-bending?

(1) to improve the molding effect 

Eliminate straight edges: without pre-bending of the plate in the rolled plate at both ends of the most likely to appear straight edges, affecting the integrity of the final molding cylindrical shape. Pre-bending can make the two ends of the sheet in advance of bending, in the process of rolling easier to form a smooth cylinder. For example, in the manufacture of large cylindrical tanks, without pre-bending, straight edges at both ends of the sheet can result in the sealing and structural strength of the tank being compromised.
Improve Roundness and Structural Integrity: Pre-bending helps to make the force on each part of the sheet more uniform during the rolling process, thus improving the structural stability and visual consistency of the entire cylinder.

(2) Enhance Material Properties 

Reduce Residual Stress: Through pre-bending, residual stresses within the sheet are redistributed, reducing the likelihood that plastic changes will occur more easily without rupture during subsequent coiling.
Enhance material ductility: For hard or thick plates, proper pre-bending can improve the ductility of the plate to a certain extent, making it easier for plastic deformation to occur in the rolled plate, reducing the risk of rupture.

(3) Improve production efficiency and consistency 

Reduce the number of adjustments: pre-bent sheet in the rolling process more in line with the process requirements, reducing the need to repeatedly adjust the parameters of the coiler due to the shape of the sheet is not suitable for the time.
Accelerate the production process: pre-bending can make the coiler operation smoother and shorten the processing time of individual products, which helps to improve the overall production efficiency. For example, in the mass production of cylindrical, pre-bending can significantly shorten the production cycle and reduce production costs.

(4) Ensure dimensional accuracy 

Accurate control of dimensions: pre-bending can provide good starting conditions for the subsequent rolled plate, which helps to more accurately control the cylinder diameter, circumference and other dimensional parameters, to avoid the perceived errors, so that it is more in line with the design requirements, improve product consistency and reliability.

3. Application of pre-bending coil plate

(1) ship construction: in the shipbuilding process, a large number of bent plates are needed to build various parts of the hull. Pre-bending coiler can quickly and accurately complete the processing of these plates to improve shipbuilding efficiency.
(2) steel structure production: for large-scale steel structure production, pre-bending coil plate is essential to effectively improve the molding and processing accuracy.
(3) Automobile production: In the field of automobile production, coil pre-bending can improve the formability of steel plate, improve the quality and safety of the body.

Pre-bending is not only a preparatory process before the rolled plate, but also an important part of the structural stability of the product and processing efficiency. If you want to know more products and information about plate rolling machine, please contact us, we will recommend the right machine and provide you with quotation.