FEM SIMULATION OF A NEW METHOD OF LENGTHWISE PIPE ROLLING ON A STUB MANDREL WITH STRETCH

The improvement of the pipe production technology at the lengthwise rolling mill was suggested. The investigations were carried out on the basis of the lengthwise rolling mill “tandem” installed at Open Joint-Stock Company «Sinarsky Pipe Works». There is an aim of mastering the whole gauge production of continuous casting on the existing equipment to reduce the production costs with the exclusion of diameter 120 mm rolled workpiece. The elongation ratio increase on the “tandem” lengthwise rolling mill is necessary to develop the continuous casting. At present time the elongation ratio on the lengthwise rolling mill no. 1 is between 1.16 and 1.5 and elongation ratio on lengthwise rolling mill no. 2 is between 1.07 and 1.15. The use of the increased elongation ratios on automatic mill “tandem” leads to increase of strap sizes and as result to increase of the amount of waste at a “guide mark” defect. The way to reduce the probability of the formation of a “guide mark” defect due to the kinematic tension during rolling on a stub mandrel with rough tube preovalisation was investigated. The infl uence of the kinematic tension on the forming tube in the groove taper at a lengthwise rolling with rough tube preovalisation was studied. The authors described the possibility of increasing the elongation ratio on the automatic mill “tandem”.

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