The principal method of high-quality tube-bending today in which the bend is formed by drawing the material around a rotating bend form. Specifically, the forward tangent of the tube is clamped to the bend die and is drawn around the die as it rotates while the back tangent is held in place against the rotating bend die by the pressure die. Thus, the point of contact between the rotating bend die and the pressure die is the line of tangency. What distinguishes rotary-draw bending from other methods is that this line of tangency is fixed in space; therefore, mandrel and wiper tooling can be fixtured at the point of bend to fully control the flow of material. This control helps to produce tube bends of superior quality.
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A complete guide to the principles of the 4-Step set-up for tube-bending tools
This is a printable handbook showing how to implement in four standardized steps the “forward mandrel” set-up for rotary-draw tube-bending machines and establish process control over the so-called black art. The procedure is based upon the guiding principle that the tools make the bend and takes advantage of the inserted design of modern mandrel tooling.