FIELD: metal forming.
SUBSTANCE: invention relates to metal forming and may be used for sizing straight-seam welded pipes by expansion. Cyclic feed of the pipe is performed with the specified pitch to the calibrating tool of the expander and the pipe is distributed in each cycle. Calibrating tool consists of segments. Each segment has a cylindrical section and an inclined lead-in section conjugated with it. Working part of lead-in section has convex radius surface. Pipe expansion is performed on cylindrical section and working part of lead-in section. Pipe feed pitch in each next feed cycle after the first one is determined by the given formula.
EFFECT: reduction of the number of expansion cycles and reduction of different dimensions of the diameter along the length and perimeter of the pipe.
3 cl, 2 dwg, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| PIPE EXPANSION METHOD | 2019 |
|
RU2763079C2 |
| METHOD OF AND DEVICE FOR EXPANDING LARGE DIAMETER PIPES | 2003 |
|
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|
RU2631997C1 |
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|
SU1704888A1 |
| PRODUCTION OF LARGE-DIAMETER WELDED TUBES | 2011 |
|
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|
RU2758399C1 |
| METHOD OF SIZING WELDED DOUBLE-SEAM PIPES BY HYDROMECHANICAL EXPANDER | 0 |
|
SU1731369A1 |
| METHOD OF SIZING WELDED DOUBLE-SEAM TUBES OF LARGE DIAMETER | 0 |
|
SU1454537A1 |
