METHOD OF COMBINED PIPE END UPSETTING Russian patent published in 2013 - IPC B21J5/08 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming, particularly, to production of tubes and may be sued for production of oil and gas pipes with upset ends of different metals and alloys. Proposed method is implemented at press by deforming tube heated end in cavity of split female die by male die. Upsetting is performed in several steps. First, tube end is upset to reduced solely inner diameter of upsetting to 1.03-1.07 of preset magnitude. Note here that upsetting factor is set suing cited relationship.

EFFECT: higher quality of upsetting.

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