FIELD: processes for making seamless tubes, namely with use of screw rolling equipment.
SUBSTANCE: method comprises steps of reducing heated blank in three-roll pass formed by rolls turned by feed angle and having reduction portion; piercing blank in pass formed by mandrel, guiding tool and two rolls turned by feed angle and having piercing portions; reducing blank in three-roll pass at feed angle of rolls consisting 1.4 - 4.0, at inclination angle of generatrix of reduction portion relative to rolling axis consisting 1.3 - 5.6, and at percentage reduction value consisting 1.6 - 6.2 respectively of feed angle, inclination angle of generatrix of roll piercing portion to rolling axis and percentage reduction value before nose of mandrel during piercing process.
EFFECT: lowered quantity of technological waste caused by occurring of inner and outer films, improved accuracy of sleeves made by screw rolling, mainly of continuously cast billets.
1 tbl, 3 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF BUSH SLEEVE RECEIVING | 2007 |
|
RU2361689C1 |
| METHOD OF HOT-ROLLED PIPE PRODUCTION | 2012 |
|
RU2489221C1 |
| PIERCING MILL FOR HELICAL ROLLING | 2004 |
|
RU2280517C2 |
| METHOD FOR MANUFACTURE OF PIPES FROM NONFERROUS METALS AND ALLOYS | 1992 |
|
RU2048219C1 |
| METHOD OF PRODUCING SLEEVES | 2015 |
|
RU2614231C1 |
| TECHNOLOGICAL TOOL FOR SKEW-ROLL PIERCER | 0 |
|
SU749469A1 |
| METHOD OF SCREW PIERCING IN FOUR-ROLL MILL | 2023 |
|
RU2821416C1 |
| METHOD FOR HELICAL PIERCING OF CAST BILLET | 2004 |
|
RU2250147C1 |
| METHOD OF HIGH-STRENGTH PIPES RECEIVING | 2007 |
|
RU2349401C1 |
| METHOD OF MAKING TUBULAR PRODUCTS | 0 |
|
SU738697A1 |
