Common Methods of Pipe Bending & Tube Bending
Rotary Draw Bending: This is the method of bending in which pipe or tube is bent using a combination of dies and other various components working in a rotary action. This action draws the pipe or tube forward making the desired bend in the pipe or tube. Rotary draw bending can also utilize mandrels. See Mandrel Bending below.
Compression Bending: This is a method of bending pipe or tube where the die in place stays stationary while a counter die bends the material around the stationary die.
Mandrel Bending: In this process a mandrel is placed inside the tube or pipe that is being bent, especially with thinner wall materials, in order to prevent defects that can occur in the bend of the piece such as rippling, flattening, or collapse.
Roll Bending: This method is used when large radius bends or curves are required. A piece of pipe or tube is passed through a series of three rollers that are in a pyramid configuration.