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The working principle of bending sh...
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The working principle of bending sheet metalInduction Bending is a precisely controlled and efficient piping bending technique. Local heating using high-frequency induced electrical power is applied during the induction bending process. Pipes, tubes, and even structural shapes (channels, W & H sections) can be bent efficiently in an induction bending machine. Induction bending is also known as hot bending, incremental bending, or high-frequency bending. For bigger pipe diameters, when cold bending methods are limited, Induction bending of pipe is the most preferable option. Around the pipe to be bent, an induction coil is placed that heats the pipe circumference in the range of 850 – 1100 degrees Celsius.
The following steps are performed for the induction bending of the pipe or pipeline system:
Fig. 1 below shows a typical induction bending process.
Fig. 1: Typical Induction Bending ProcessInduction bends are normally produced in standard bend angles (e.g. 45°, 90°, etc.). However, depending on the requirement they can be custom-made to specific bend angles. Compound out-of-plane bends in a single joint of pipe can also be produced. The bend radius for induction bending is specified as a function of the nominal pipe diameter (D) like 5D, 30D, 60D bends, etc. Fig. 2 below provides a schematic diagram of the induction bending mechanism.
Fig. 2: Schematic Diagram of Induction Bending MechanismThe important parameters that affect the induction bending process are:
As the complex induction bending process involves various steps for producing bends, it must be controlled precisely to produce quality items. Different codes and standards govern this process. The most conventional and widely used standards for induction bends are the ASME B16.49 and ISO 15590-1(en).
The major advantages of induction bending are:
The majority of the Induction bends are found in the pipeline systems for liquid and gas transportation. Additionally, they are found in applications requiring large diameter bends with precision and reliability and where the laminar smooth flow is required. Typical applications of induction bends include the following industries:
The following pipe materials are normally used for forming by induction bending:
The main differences between Induction bending or Hot bending and Cold Bending are listed below in a tabular format:
Induction Bending / Hot BendingCold BendingHeat Input is a must in induction or hot bendingCold bend does not need any added heat.Hot bending is a Slow ProcessCold bending is a Fast Process as no heating & cooling is involvedBetter control is achieved in Hot bending.Cold bending does not provide precise control.Highly efficient complex types of machinery are used for hot bending.The cold bending process uses Simple machines.The hot bending Process is efficient for larger pipe diametersNot suitable for large pipe diameters. Cold bending is limited to smaller-diameter piping only.Induction bending is a Costly processCold bending is not expensive.In Hot bending usually no wrinkling on the pipe surface.The is a High probability of wrinkling on the pipe surface during cold bending.The required force in hot bending is normally less.The physical Force requirement in cold bending is comparatively moreHot Bending vs Cold BendingIf you have any questions on induction pipe bending machine. We will give the professional answers to your questions.