The Role Of The Mandrel In Tube Bending

Hippo has summarized a formula based on long-term practical experience, which can help you quickly determine whether a mandrel is needed to complete the bend.

D is the outer diameter of the tube, T is the wall thickness of the tube, and R is the bending radius. The difficulty of bending a pipe depends on the wall thickness and bending radius of the pipe. The smaller the wall thickness and the smaller the radius, the more difficult it is to process.

We use relative wall thickness tx = t / D and relative bending radius Rx = R / D as the bending process parameters. For pipe fittings with Rx>3D and tx>0.04, standard tools can be used. For pipe fittings with Rx <3D and tx <0.04D, mandrels, wiper die and other technical measures can be added to ensure bending quality.