An architectural term borrowed by tube-bending to describe region of material flow. The intrados is that section of the tube which is undergoing compression during the bend forming process; that part of the tube of which the wall thickens. Roughly, the intrados corresponds to inboard half of the tube bend, but in fact does not extend all the way to the centerline radius. The intrados is separated from the extrados by the neutral axis.
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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.