Induction Bending and Cambering
How it Works

Introduction To Induction Bending
Induction bending is a process that uses a combination of hydraulics and heat to produce a bend in metals.  Induction is a simple and effective method of heating material by the eddy current effect of an induced electrical current.   Although this concept is simple, it has taken an intensive research and development program to bring the Induction Bending System to the current state-of-the-art.

How it Works

The product to be bent is passed through an induction coil where a narrow circumferential band of the material is raised to forging temperature. The material on each side or the heat band is cooled by specially designed air and/or water cooling coils.

The pipe (or structural shape) is clamped to an arm that is secured to a pivot. The radius of the bend is determined by the length of the pivot arm. A hydraulic cylinder pushes the material through the heating coil while the radius arm bends the material to the prescribed radius. To change the bend radius, simply relocate the pivot point and adjust radius arm length.

During bending, the narrow heat zone is supported by the "cold" material on each side. This eliminates wrinkling and ovality problems. No dies or mandrels are required. The rigid material on either side of the heated band provides support to the heated material.

The material is hydraulically pushed rather than pulled through the bend. Therefore, changing thickness is not a problem. Simply change the heating and bending rates.

Induction bending produces an excellent quality. Less than 5% thinning is typical for schedule 40 pipe bends as small as 3-D.

Induction Bending and Cambering

CAMBERING  
Cambering is a cold bending process that uses hydraulic power to bend a beam (or pipe) against two fixed points. The operating principle for cambering is very simple. The material is placed in a bending frame with the ends positioned against fixed structural restraints. Hydraulic rams push against the center of the beam - bending the beam to a prescribed radius. The hydraulic pressure is released, the beam checked for accuracy, and then removed from the frame.

This process is a high production, accurate, and low-cost form of bending where it can be employed. Cambering is primarily used to bend long sweeping curves in beams used for bridge spans or floor structure for buildings. Although there is a considerable limit on the minimum bend radius, it has the advantage of bending very large beams and pipes at a relatively low cost.

BENDING PROCESSES

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