METHOD FOR CONTROLLING PREPARATION OF PRODUCTION PROCESS OF STRAIGHT-SEAM ELECTRICALLY WELDED TUBES IN LINE OF HEAT POWER STATION Russian patent published in 2007 - IPC B21C37/06 

FIELD: plastic working of metals, possibly preparation of production process of electrically welded straight-seam tubes in line of tube electrically welding aggregate.

SUBSTANCE: before manufacturing set of roll tool, initial perimeter of profile of tube blank is divided by profile portions with constant curvature along contact width of roll. Roll grooved passes are formed by means of several single- radius rolls, namely: driving rolls forming together with blank pulling contact areas and idle rolls forming together with blank braking contact areas. The size values of roll are calculated and corrected in such a way that to provide equal pulling components of contact areas of adjacent roll grooved passes. Length of contact area of roll is determined according to given formula where k_∂ - correction coefficient of deformation pattern equal to 2.4; k - angular bending intensity coefficient equal to 0.014 - 0.82; h_Σi - height of profile in i- stand, mm; R_npi -reduced radius of shaping in i-stand, mm; R_∂i - radius along bottom of roll groove in I-stand, mm;_{bi - width half of contact area, mm; Φi - lifting angle of blank edge in I-stand, rad; Φi-1 -lifting angle of blank edge in (i-1)-stand, rad; S - thickness of strip, mm; εel - elastic deformation value of given material; εi - current value of bending deformation in i-stand.}

EFFECT: simplified preparation process.

11 dwg, 8 tbl, 1 ex