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ABSTRACT
Widely used in the automobile industry for the manufacture of aluminum rims or in aeronautics for the manufacture of large stainless-steel parts, flow-forming is a highly interesting technique for the plastic deformation of metals. Its principle resembles that used by potters: it allows for the lengthening of an axisymetrical preform by reducing its thickness. This article presents the various existing modes of flow-forming (conical and cylindrical) as well as the mechanical analysis of the technique and its implementation. The machines and tools involved are also presented together with the characteristics of the objects obtained via this method.
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Marie HOUILLON: Doctorate from the École des Mines de Paris - This article is an update of the previous edition written in 1984 by Jean-Pierre VERGÈS and Jean-Pierre BERNADOU.
INTRODUCTION
Using a long-established principle – similar to the potter's technique – mechanized since the 1950s, fluotournage consists in plastically deforming metals by point extrusion, with the material flowing between a rotating mandrel and one or more rollers exerting high pressure. The metal flows as it rotates, hence the name given to the process.
It enables an axisymmetric preform to be elongated by reducing its thickness. This reduction in thickness is characteristic of the process, and the name "repoussage" is reserved for shaping with a constant thickness.
Depending on the material, flow forming can be carried out cold (i.e. without heating the blanks), or hot (450 to 1,050°C depending on the metal).
English-speaking countries use several equivalent terms: spinning, flow-spinning, flow-forming, flow-turning, shear spinning.
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