{"id":12944,"date":"2026-03-02T09:55:59","date_gmt":"2026-03-02T08:55:59","guid":{"rendered":"https:\/\/www.lyon-cintrage.fr\/?p=12944"},"modified":"2026-03-02T09:57:11","modified_gmt":"2026-03-02T08:57:11","slug":"when-know-how-transforms-technique-into-art-2","status":"publish","type":"post","link":"https:\/\/www.lyon-cintrage.fr\/en\/when-know-how-transforms-technique-into-art-2\/","title":{"rendered":"How to Bend a Tube?"},"content":{"rendered":"\n

The technique of cold rotary draw bending is a very specific trade with little-known expertise; let’s try to demystify it…<\/h2>\n\n

A bend is said to be short-radius when its radius is less than 6 times the tube diameter. For example, a \u00d860 mm tube bent at “1D” will have a radius of 60 mm. <\/p>\n\n

If the radius is larger than “6D”, it is often referred to as “tube rolling”. Rolling uses other techniques that we will not cover in this article. <\/p>\n\n

Tight-radius bending is used when space is limited and part compactness is important, particularly in sectors such as Aerospace, Space, or Energy…<\/p>\n\n

Why is “1D” bending complex?<\/p>\n\n

The shorter the radius, the higher the stress applied to the material and the greater the risk of deformation. “1D” tube forming therefore involves very significant mechanical constraints. <\/p>\n\n

Complexity increases significantly when the tube has a thin wall thickness. On thin tubes, the risk of defects is amplified: <\/p>\n\n