FIELD: rolled tube production, namely technological tools, particularly processes for calibrating rolls of pilger mills for rolling thin-wall tubes.
SUBSTANCE: method comprises steps of calibrating working portions of rolls having striker and polishing portion with angle of lengthwise outlet (both having the same angular and linear parameters) for forming variable grooved pass; making polishing portions of rolls with increased length values; determining said values according to expression 
where Rr - rolling radius of roll in polishing portion, mm; α - angle of polishing portion of lower roll, °; m - metal feed value to deformation zone, mm; μ - elongation factor at rolling minimum thickness wall of tubes of given diameter; k = 0.25 - 0.30, coefficient whose less value is used for tubes with size 273 x 8 mm and large value is used for tubes 426 x 9 mm. Invention provides lowered allowance for wall and for outlet of tubes in tube rolling aggregates with pilger mills having relation D/S = 40 - 53 according to standard.
EFFECT: elimination of "corrugation" occurring in lower part of sleeve-tube, lowered cross wall thickness difference usually caused by non-complete rolling out of "corrugations" by upper roll.
1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| ROLL OF PILGRIM MILL FOR ROLLING OF THIN-WALLED PIPES FROM COLD-RESISTANT AND CORROSION-RESISTANT GRADES OF STEEL | 2012 |
|
RU2516887C2 |
| ROLL OF PILGER MILL FOR ROLLING THIN-WALL TUBES | 2005 |
|
RU2294250C2 |
| METHOD FOR PREPARING AND CALIBRATING ROLLS OF PILGER MILL | 2004 |
|
RU2288060C2 |
| PILGER MILL ROLL FOR HOT ROLLING OF 610(10-40mm-PIPES | 2013 |
|
RU2537342C2 |
| ROLL OF PILGER MILL FOR ROLLING OF THIN-WALL TUBES WITH DIAMETER OF 508 MM WITH INCREASED ACCURACY AS TO WALL | 2013 |
|
RU2542131C1 |
| PILGER MILL ROLL FOR HOT ROLLING OF 530 AND 550 MM THIN-WALL PIPES | 2013 |
|
RU2537637C2 |
| ROLL OF PILGRIM MILL FOR ROLLING OF TUBE STOCKS WITH SIZE 290H11-12 MM FROM LOW-DUCTILE BORON-CONTAINING STEELS OF GRADES 04H14T3R1F-SH AND 04H14T5R2F-SH | 2012 |
|
RU2516148C1 |
| PILGER MILL ROLL FOR 273-630 MM DIAMETER PIPES ROLLING | 2014 |
|
RU2564503C2 |
| PRODUCTION OF 273-630 MM DIAMETER 8-90 MM DEEP WALL SEAMLESS HOT-ROLLED PIPES AT PIPE ROLLING PLANT 8-16'' WITH PILGER MILLS | 2012 |
|
RU2519195C1 |
| PREPARATION OF PILGER MILL ROLLS FOR HOT-ROLLED PIPES ROLLING | 2013 |
|
RU2545890C2 |
