Abstract
The shaping of the large-diameter pipes on the pre-shaping press of the tube-electric welding unit with help of the punch with a flat-bottom is an important applied technical problem in the ferrous metallurgy. The proper selection of the shape’s characteristics of the punch and the shaping’s characteristics for the given characteristics of the steel sheet is the complicated technical problem for the technologists of the pipe shops. On the one hand, the insufficient reduction of the steel billet on the pre-shaping press leads to too large a gap between the longitudinal edges of the steel sheet. In this case, the welding of the sheet edges is impossible. The pipe billet has to be additional bent on the special press before the welding of the sheet’s edges, since there is not enough power of the devices for pressing the edges to each other on the electric welding unit before the pipe’s assembling. On the other hand, the excessive reduction of the steel billet on the pre-shaping press leads to the defect of the edges’ overcloak after shaping the billet on the final-shaping press. All this leads to significant downtimes in the continuous manufacture process of the steel pipes.
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