CALIBRATION OF PIPE ROLLING TOOLS Russian patent published in 2009 - IPC B21B21/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to pipe rolling industry and, in particular, to periodic cold and hot pipe rolling on roll-type mills. To calibrate cold-rolling tools, scanning profile curves of internal and external tools are represented with a geometrical point of different spline-functions node points. Besides, coordinates of internal and external tools profile curves are determined from the conditions of deformation ratio consistency and the given pipe deformation intensity distribution uniformity: , where d_kx - groove caliber diametre; d_ox - mandrel diametre; y - offset cross section x to the value equal to the product of half-finished item supply m and runny drawing µ_x during rolling: y=x+m·µ_x.

EFFECT: application of new calibration methods ensures increasing output of accepted industrial pipes with homogeneous metal structure along pipe cross section and extending tool life time.

5 cl, 1 dwg, 1 ex