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    • 6. 发明公开
    • PROCESS FOR MACHINING WELDED PIPES
    • EP3520923A1
    • 2019-08-07
    • EP19154917.9
    • 2019-01-31
    • Boin, Matteo
    • Boin, Matteo
    • B21D41/02
    • The present invention relates to a process for machining welded pipes, which consists of an expansion calibration machining of said welded pipe, where the controlled widening of the inner diameter of the pipe is achieved and where a radial expansion spindle (1) is used, consisting of a punch (2) that penetrates coaxially in a die (3) on which is inserted the pipe (T) to be widened exercising an expansion calibration action consequently to the radial displacement of said radial sectors (5). Said process being characterised in that it uses a punch (2) provided with a reciprocating roto-translational incremental movement (F 1 , F 2 ), with a number of sides equal to the number of radial sectors (5), which constitute the die (3), where said radial sectors (5) undergo, after each step of penetration of the punch (2) in the matrix (3), an angular rotation that is caused directly by the angular rotation of the aforesaid punch (2) whose movement is obtained through an axial advance/return station (10) and an angular rotation station (20) arranged cooperating at the end of said punch (2) and commanded by a PLC.