METHOD FOR PREPARING ROLLS OF PILGER MILLS FOR HOT ROLLING OF TUBES Russian patent published in 2005 - IPC

FIELD: tube production processes and equipment, namely preparation of rolls of pilger mills for hot rolling of tubes.

SUBSTANCE: method comprises steps of mechanically working portion of roll in roll-turning machine tool with use of contour follower for surfacing it with overlap 5 - 10° to side of cold portion from zero point and from angle of lengthwise outlet; under-flux surfacing working portion with wear-resistant refractory steel layer having allowance for mechanical working; mechanically working rolls with use of contour follower until their ready size and grinding working surface. Mechanical working of rolling portion of roll after surfacing is performed along portion from 0.25 - 0.30 of striker length until end of angle of lengthwise outlet adjoined to polishing portion. Grinding of polishing portion and of 0.25 - 0.30 of angle of lengthwise outlet adjoined to polishing portion is realized. Mechanical working of rolling portion of roll for surfacing from zero point until 0.25 -0.30 of striker portion is performed while taking into account allowance of surfaced layer for finish working.

EFFECT: enhanced strength of rolls of pilger mills, improved accuracy of their geometry size and quality of tube surface, lowered consumption of high-cost steel wire rod.

2 cl, 1 dwg, 1 tbl