An axial (or Y-axis) pressure function common to modern rotary-draw tube-bending machines; a pressure or speed setting driving the pressure (or follower) die forward; a pressure applied parallel with the axis of the tube to be contrasted with “direct pressure” which is applied radially (that is, in the X-axis) to the tube. The importance of assist pressure is that it mitigates the drag caused by the tooling on the tubing at the point of bend, which helps to reduce wall-thinning and deformation of the extrados.
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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.