FIELD: pipe manufacturing.
SUBSTANCE: invention is related to production of steel pipes for highly sealed threaded connections of the Premium class. During the manufacturing of pipes, their ends are shaped. The pipe ends are formed to a predetermined length to obtain the required outer diameter by means of a cylindrical matrix made in form of a ring and fixed on the plunger of the hydraulic cylinder of the pipe end forming machine. Then the pipe ends are shaped to a predetermined length to obtain the required inner diameter and allowance for machining by means of a cylindrical punch made in form of a ring and fixed on said plunger of the hydraulic cylinder of the pipe ends forming machine. The total amount of deformation during formation of the ends of the pipes does not exceed 3%, and forming of the ends of the pipes is carried out without preliminary heating of the deformation zone.
EFFECT: negative effect of the pipe wall thickness difference is eliminated in the manufacturing of a pipe with a given inner diameter.
2 cl, 1 dwg
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