FIELD: metal forming.
SUBSTANCE: invention relates to metal forming and can be used in making pipes from low-ductility alloys. Bending pipe has variable cross section. Two end sections are made with round cross section. On the length adjacent to the middle of the pipe, there are two sections with an oval cross section. Long and short axes of the oval in one section are located at a right angle relative to the long and short axes of the oval in the other section.
EFFECT: reduction of mechanical stresses at pipe bending.
1 cl, 6 dwg, 2 ex
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