FIELD: transport engineering; trailers. SUBSTANCE: when making upper and lower rings of turntables, ring blank welded seam area, after butt-welding, is moulded in die in state of plastic deformation. Before straightening and sizing operations, ring blanks heated to plastic deformation state are cooled in air to equalize temperature over entire blank. machining of rings in vertical boring-and-turning mill is carried out with round-nose tool. Center of tool in process of cutting is moved along equidistant curve with circular interpolation relative to points of intersection of conjugation of machined surfaces. EFFECT: improved quality of turntable rings. 3 cl, 2 dwg
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