FIELD: cold-deformed pipes.
SUBSTANCE: nominal outer diameter of round pipe blanks is determined using the formula:
, where Нт is the distance between the parallel edges of the outer contour of the hexagonal pipe, mm, r is the radius of the pairing of the faces of the internal hexagonal contour of the pipe, mm. Cold profiling is carried out without changing the wall thickness in a groove formed by at least three rolls. Profiling is carried out on a mandrel in at least two passes, between which the pipes are turned relative to the gauge axis at an angle of 60°. The number of passes is determined by the formula: 
, and each subsequent pass is carried out in a calibre, the size of which is reduced by ΔH=(0.006-0.01)HT.
EFFECT: accuracy of the mating radii of the faces of the internal contour of the pipes and the straightness of the pipes are ensured.
1 cl, 5 dwg, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| MANDREL FOR COLD WORKING OF PIPES | 2023 |
|
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SU1274790A1 |
| MACHINE FOR FORMING LONGITUDINALLY CORRUGATED PIPES TO SHAPE | 0 |
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SU1731340A1 |
| SHAPE BENDING MILL FOR MAKING TUBES WITH FOLDED SEAM | 2000 |
|
RU2181313C2 |
