FIELD: plastic working of metals, namely processes for rolling off sleeve in multi-roll helical rolling mill, possibly manufacture of thin-wall tubes in tube rolling aggregates equipped with three-roll rolling-off helical mills.
SUBSTANCE: method comprises steps of clamping sleeve, reducing it for fitting it to mandrel at certain reduction of wall; intensively reducing till final thickness of tube wall and calibrating sleeve by diameter and wall thickness. Intensive reduction is realized by wedging outer surface of sleeve in axial direction. Then at least one ridge is formed on said outer surface for further rolling off sleeve. Intensive reduction of sleeve wall is realized by several transitions depending upon degree of sleeve wall thinning.
EFFECT: elimination of end flared portion formation, improved strength of rolls, possibility for producing thin-wall high- accuracy tubes in tube rolling aggregates provided with three-roll rolling-off helical rolling mills.
2 cl, 2 dwg, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCTION OF THIN WALL PIPES AT PIPE-ROLLING PLANTS WITH THREE-ROLL REELER | 2013 |
|
RU2556164C1 |
| METHOD FOR HOT ROLLING OF SEAMLESS THIN-WALL TUBES | 1998 |
|
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| METHOD OF PRODUCING SEAMLESS THIN-WALL PIPES | 2009 |
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| METHOD OF PRODUCING SEAMLESS TUBES | 2009 |
|
RU2400317C1 |
| TUBE-MANUFACTURING METHOD | 0 |
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SU647024A1 |
| METHOD OF HELICAL EXPANSION OF TUBES | 0 |
|
SU679266A1 |
| PROCESS TOOL FOR HELICAL ROLLING | 0 |
|
SU1138197A1 |
| METHOD OF HOT ROLLING OF SEAMLESS THIN-WALL PIPE | 2008 |
|
RU2368440C1 |
| METHOD OF EXPANDING ELONGATED SLEEVES | 0 |
|
SU925450A1 |
| METHOD OF HOT-ROLLED PIPE PRODUCTION | 2012 |
|
RU2489221C1 |
