Plug, method of expanding inside diameter of metal pipe or...

B - Operations – Transporting – 21 – D

Patent

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B21D 39/20 (2006.01)

Patent

CA 2580420

The plug is for expanding the inside diameter of the end portion of a metal pipe. Its cross section is a circle, and includes a taper portion and a parallel portion connected to the tail end of the taper portion. The diameter of the taper portion gradually increases from the head end of the taper portion to the tail end of the taper portion where the diameter is D1. The axial distance LR from the point where the diameter D2=D1x0.99 to the tail end where the diameter is D1 satisfies the Expression 22<=LR/((D1-D2)/2)<=115. The taper angle on the surface where the diameter is D2 is larger than or equal to the taper angle on the tail surface of the taper portion following the point where the diameter is D2. The diameter of the parallel portion is D1.

L~invention concerne un bouchon servant à dilater le diamètre intérieur de la partie d~extrémité d~un tuyau métallique. Sa section transversale est circulaire et comporte une partie conique et une partie parallèle raccordée à l~extrémité de queue de la partie conique. Le diamètre de la partie conique augmente progressivement de l~extrémité de tête de la partie conique à l~extrémité de queue de la partie conique, où le diamètre est égal à D1. La distance axiale LR entre le point où le diamètre D2 est égal à D1 x 0,99 et l~extrémité de queue où le diamètre est égal à D1 vérifie l~expression 22 <= LR / ((D1-D2) / 2) <= 115. L~angle de conicité sur la surface où le diamètre est égal à D2 est supérieur ou égal à l~angle de conicité sur la surface de queue de la partie conique qui suit le point où le diamètre est égal à D2. Le diamètre de la partie parallèle est égal à D1.

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