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Pipe bending is a process wherein the pipe to be bend is heated to a specified temperature by high frequency induction heating coil and bending is done in hot condition. The pipe is clamped at the forward end by the radius arm clamp. The tail end of the pipe is locked in the pushing carriage clamp. The pushing carriage moves on the main track as it is fitted with a chain, which is driven by a DC Motor at a fixed constant speed through a gearbox.
When current is supplied through high frequency current transformer to the coil, heating of pipe starts. The heating temperature is strictly controlled depending upon the material of the pipe and its wall thickness. When the specified temperature is attained, the DC Motor is started at a preset speed which drives the pushing carriage in the forward direction. As a result the pipe begins to advance being bent simultaneously. Immediately after the bending process, quenching will follow. The Radius Arm is designed so that the pipe will be bent by the same distance as the one between the center of a pair of rollers and the axis point of the arm. The arm rotates in natural mode around the pivotal point. The heated portion begins to transform its elasticity due to the difference of strength between the heated and unheated portion of the pipe.
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