Usage: metal forming in the preparation of large hollow workpieces. SUMMARY OF THE INVENTION: prot buckle the hollow shell is carried out on a mandrel, in which the intermediate portion of the conical shape with a larger base diameter equal to the diameter of the base larger working section and a taper 1-7,5 & amp; deg ;. When the longitudinal feed workpiece is moved relative to the mandrel in the direction of the smaller end of the working section. 2 yl.
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