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Cold pilger mills for rolling of sheet and flat profile
The mills are intended for cold periodical (pilger) rolling of flat and profile sheets (strips).
Rolling is carried out by reciprocally moving rolls with cylindrical or profiled working surfaces. Rolling through two schemes is foreseen:
- rolling by means of two rolls reciprocally moving;
- rolling on the plate by meaпs of one roll reciprocally moving.
Billet feeding and straightening is carried out by means of leveling and feed rollers. Impulsive drive of rollers is carried out by means of planetary-crank transformer. Working stand setting-up is implemented by means of three pressure mechanisms from mill control desk.
Technical parameters of cold pilger mill for rolling of sheet and flat profile
Standard sizes
| Mill size | Billet parameters | Reducing, % | Mill overall dimensions, m | |||||||
| width, mm | thickness, mm | Coil weight, t | Thickness of strip, mm | Maximal billet feeding speed, m/min | For plastic materials | For hard deformed materials | Width | Length | Roll diameter, mm | |
| HPL 250 | 250 | 8-20 | 2.5 | 1-4 | 1.5 | 70-90 | 30-70 | 8 | 25 | 60-130 |
| HPL 400 | 400 | 10-20 | 3 | 1.5-5 | 2 | 8 | 25 | 60-130 | ||
| HPL 650 | 600 | 12-20 | 5 | 2.5-8 | 2 | 10 | 25 | 60-130 | ||
The principal difference of this method from conventional methods of sheet production is that the deformation of initial billet is carried out by means of rollers mounted in the movable cassette which receives a reciprocating movement from the drive of travel. Sheet reducing when cassette moving is performed at the expense of rolls approach leaned on the profiled support rails.
In extreme front and back positions of roll cassette the initial shell advances on the rolling line to feed amount. Since at the return stroke wall reducing does not occur, then half of the total per double stroke (forward and backward) feed value given in back position of the cassette is turned out with the second half given in front position. Reducing of single feed value twice allows to decrease sufficiently dynamic loads in feeding mechanism that provides with more stable and reliable operation of the mechanism.