How are pull rollers in stirrup bending machines made from solid SCM440H steel with a diameter of 130 mm?

1. What are Pull Rollers in Stirrup Bending Machines?

In addition to the straightening unit, which includes multiple straightening rollers made from solid SCM440H steel with a diameter of 65 mm, stirrup bending machines also feature four large pull rollers.

When the machine starts operating, the steel rods are placed on the support bar, and one end is fed into the straightening unit (commonly referred to as the straightening mechanism). As the steel passes through this unit, it is secured and straightened by the four pull rollers.

After being straightened and passed through the pulling system, the next stage involves bending angles and forming the product shape.

This raises the question: What material should the pull rollers be made of to ensure durability and cost-effectiveness for the user?

2. Why Use Solid SCM440H Steel, Diameter 130, for Pull Rollers?

Due to the working environment, where the rollers are in direct contact with the steel surface, pull rollers are subjected to various forces, such as tension and friction.

Therefore, the material chosen for pull rollers must possess suitable hardness and ductility while being resistant to wear and capable of withstanding surface contact forces effectively.

Pull Rollers in Stirrup Bending Machines

Many manufacturers currently use S45C steel as the primary material for pull rollers in stirrup bending machines. However, during operation, S45C steel often encounters issues such as cracking or breaking, leading to frequent replacements and increased costs for manufacturers.

To address these issues, solid SCM440H steel with a diameter of 130 mm has been adopted for pull rollers due to the following reasons:

- Resistance to various forces: SCM440H can endure significant mechanical forces during operation while maintaining both toughness and hardness.

- Improved wear resistance: The chromium content of approximately 1.2% significantly enhances its wear resistance compared to other types of steel.

- High achievable hardness: After oil quenching, SCM440H steel can achieve a hardness of up to 55 HRC.

By replacing S45C carbon steel with solid SCM440H steel for pull rollers and other components in stirrup bending machines, manufacturers can reduce material costs by minimizing replacement frequency and enhance the credibility of their machinery.

We hope this article provides valuable insights into the use of SCM440H steel for pull rollers in stirrup bending machines.

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