Stein Industrie

Societe Anonyme Dite: Stein Industrie

Jacques Nicolas

Paul Lenglet

Gilbert Degrande

A method and apparatus for bending thick metal tubes is disclosed and is characterized in that thermal insulation is disposed inside the heated zone of the tube being bent, and that the thickness of said thermal insulation is great enough to considerably reduce the temperature gradient between the inside and outside surfaces of the tube in said heated zone.

Method of bending a thick metal tube, and apparatus for implementing the

A method of bending a long metal member of constant cross-section by locally heating a narrow zone on the periphery of said member by means of a heating collar (5) which surrounds said zone, by exerting thrust (2) on one end of the member and by supporting its other end by means of a pivoting arm (3). The temperature of the heated zone on the periphery of the member is kept substantially constant by detecting the temperature of this zone or the size of the gap which separates the heating collar from the periphery of said zone at at least two points around said periphery, one of these points being nearest the center of curvature and the other being on the opposite side to the first. The input of heat at one or other of these points is increased or reduced according to whether the temperature is lower or higher than a nominal temperature at said point, or to whether the gap is greater or smaller than a nominal gap at said point, said nominal values of temperature and gap corresponding to uniform heating around said periphery.

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Bondues, France

Jacques Nicolas