A non-mandrel method of bending in which the compression of the intrados is controlled by stretching it over a “crush knob” seated in the cavity of the bend die. This eliminates the wrinkling or buckling that might occur if the tube were bend without a mandrel. Commonly used on non-round tube bends.
FREE Tube-Bending Guide Download:
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.