How to bend Hollow Steel Tube?

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Bending hollow steel tubes is a crucial process in many industries, from construction to automotive manufacturing. The ability to shape these sturdy materials into various curved forms opens up a world of design possibilities. However, bending hollow steel tubes requires specialized techniques to maintain structural integrity and achieve the desired shape. 

Hollow steel tube

Hollow steel tube

 

Pyramid Rolling Or Cold Bending:

Pyramid rolling, also known as cold bending, is a widely used method for bending hollow steel tubes. This technique involves passing the tube through a series of rollers arranged in a pyramid-like configuration. As the tube moves through the rollers, it is gradually bent to the desired angle or curve.

The process begins with the tube entering the machine at one end. The rollers, typically three or four in number, apply pressure to different points along the tube's circumference. By adjusting the position and angle of these rollers, operators can control the bend radius and shape of the curve.

One of the main advantages of pyramid rolling is its ability to produce smooth, consistent bends without significant deformation of the tube's cross-section. Larger diameter and thicker walled tubes work best with this technique. It is an efficient procedure for high-volume production because it is also rather quick.

 

GAG Pressing Or Point Bending:

GAG pressing, which stands for Gag-Angle-Gag pressing, is another method used for bending hollow steel tubes. This technique is also referred to as point bending because it applies force at specific points along the tube's length to create the bend.

In GAG pressing, the tube is placed between two fixed points called "gags." A hydraulic press then applies force to a third point between these gags, causing the tube to bend. By controlling the amount of force applied and the distance between the gags, operators can achieve various bend angles and radii.

This method is particularly useful for creating sharp bends or when working with tubes that have a large diameter-to-wall thickness ratio. GAG pressing can produce bends with minimal distortion of the tube's cross-section, making it ideal for applications where maintaining the tube's original shape is crucial.

 

Rotary Stretching Or Compression Bending:

Rotary stretching, also known as compression bending, is a technique that involves bending the tube around a fixed die or former. This method is commonly used for creating tight radius bends in hollow steel tubes.

In this process, one end of the tube is clamped securely to the bending machine. The tube is then rotated around a fixed point (the die) while a pressure die applies force to the outside of the bend. As the tube is bent, the material on the outside of the curve is stretched, while the inside is compressed.

Rotary stretching can produce very tight bends, even in tubes with thin walls. However, it may cause some flattening or ovalization of the tube's cross-section, especially in large-diameter tubes. To minimize this effect, mandrels (internal supports) are often used inside the tube during the bending process.

 

Synchronous Incremental Cold Bending:

Synchronous incremental cold bending is a more advanced technique that allows for the creation of complex, three-dimensional bends in hollow steel tubes. This method combines elements of both rotary bending and incremental forming.

In this process, the tube is fed through a bending head that can rotate around multiple axes. As the tube moves through the machine, the bending head applies pressure at specific points, gradually forming the desired shape. The bending is done in small increments, allowing for precise control over the final form.

One of the key advantages of synchronous incremental cold bending is its ability to create bends with varying radii and directions within a single tube. This makes it particularly useful for producing complex parts for aerospace, automotive, and other high-tech industries.

 

Hollow Steel Tube Manufacturer:

When it comes to sourcing high-quality hollow steel tubes for your bending projects, choosing a reliable manufacturer is crucial. LONGMA GROUP is a reputable manufacturer of hollow steel tubes, offering a wide range of products to meet various industrial needs.

LONGMA GROUP maintains a substantial stock of hollow steel tubes, with quantities ranging from 50 to 150 tons. This significant inventory ensures that customers can access the materials they need promptly, reducing lead times and improving project efficiency.

The company's steel tubes are manufactured to meet industry standards, ensuring consistent quality and performance. Whether you're working on a large-scale construction project or a specialized manufacturing application, LONGMA GROUP's products provide the reliability and versatility needed for successful tube bending operations.

If you are in the process of selecting a hollow steel tube manufacturer for your next project, consider reaching out to LONGMA GROUP. Their team of experts can provide guidance on selecting the right type of tube for your specific bending requirements. For more information or to discuss your needs, you can contact them at info@longma-group.com.