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Section Bending: Techniques, Machines, and Advantages

PBH-500 Profile Bending Machine

Section bending is a metalworking process that involves bending various types of profiles to create curved sections. This article explores the concept of section bending, its working principles, the machines used for this process, the calculation methods involved, tips for selecting a section bending machine, and the advantages it offers.

I. What is Section Bending?

Section bending is a technique used to bend metal profiles, such as beams, channels, angles, and tubes, to achieve curved or circular shapes. It is widely employed in industries like construction, metal fabrication, and manufacturing to create custom curved components for various applications.

II. How Does Section Bending Work?

How to bend angle iron? angle roll 【Section Bending Machine】【angle roll machine】

Section bending works by using specialized machines called section bending machines or profile bending machines. These machines feature adjustable rollers or rolls that are positioned in a triangular or pyramidal arrangement. The rolls have contoured surfaces that match the desired curvature of the metal section.

III. Machines Used for Section Bending

Section bending machines come in various types, including:

  1. Three-Roll Bending Machines: These machines have three rolls – two driven rolls and one idle roll – forming a triangle. They are commonly used for bending large profiles and offer excellent precision.
  2. Four-Roll Bending Machines: Four-roll machines have two bottom rolls and two top rolls, allowing for more precise bending and improved control over the process. They are ideal for bending thick and heavy sections.
  3. Profile Bending Machines: These machines are designed specifically for bending profiles, providing versatility and ease of use. They can handle a wide range of profiles with different shapes and sizes.
PBH-500 Profile Bending Machine

IV. Calculating Section Bending

Calculating the parameters for section bending involves determining the bending force, bending moment, and the required section modulus. The specific calculations depend on factors such as the material properties, profile dimensions, and desired curvature. Engineering handbooks and software programs can assist in these calculations.

V. Selecting a Section Bending Machine

When selecting a section bending machine, consider the following factors:

  1. Profile Types and Sizes: Choose a machine that can handle the specific profiles you will be bending in terms of dimensions, shapes, and material thickness.
  2. Machine Capacity: Consider the machine’s capacity in terms of bending force, roll diameter, and roll length to ensure it meets your production requirements.
  3. Automation and Control: Evaluate the level of automation and control features offered by the machine, such as CNC capabilities, for improved precision and efficiency.
  4. Operator Safety and Ease of Use: Look for machines with safety features, ergonomic design, and user-friendly interfaces to enhance operator safety and productivity.

VI. Advantages of Section Bending

Section bending offers several advantages, including:

  1. Design Flexibility: Section bending allows for the creation of custom curved sections, opening up possibilities for innovative and aesthetically pleasing designs.
  2. Material Savings: Curved sections can be achieved by bending straight profiles, reducing material waste and costs compared to using pre-formed curved sections.
  3. Time Efficiency: Section bending machines enable the production of curved sections with minimal manual effort, saving time and increasing productivity.
  4. Precision and Accuracy: Advanced section bending machines provide precise and accurate bending, ensuring the desired curvature is achieved consistently.
  5. Versatility: Section bending machines can handle a wide range of profiles, offering versatility in terms of the types of components that can be produced.


Section bending is a versatile metalworking technique that allows for the creation of curved sections in various industries. By understanding the working principles, selecting the right machine, and leveraging its advantages, manufacturers can achieve efficient and precise curved metal components for their applications. Section bending opens up new design possibilities and contributes to the advancement of modern metal fabrication processes.