METHOD OF PRODUCTION OF STEEL SEAMLESS PIPES OF MAJOR DIAMETER Russian patent published in 2009 - IPC B21C23/08 

FIELD: metallurgy.

SUBSTANCE: invention relates to metal deformation process field. Particularly it relates to manufacturing technique of steel seamless pipes. Method includes heating of solid round, its and extrusion toolage coating by grease lubricant on the basis of glass, blank stitching and pipes pressing, separating of received pipe from butt-end and its disposal from matrix. Stitching and pressing are implemented on vertical hydraulic trumpet extruding-press in one operating cycle of the press. Blank is stitched in container by press mandrel with preliminary premolding of the blank. Pipe is pressed by direct method with metal outflow under a force of compression ram with pressure pad through the matrix down with elongation ratio no less than 1.4. Grease lubricant contains graphite in volume ratio with glass (1:4)…(1:5).

EFFECT: invention provides operations unification of blank stitching and pipe pressing, design simplification, downsizing and mass reduction of the press, process productivity improvement of pipes pressing and waste metal reduction while stitching and pressing.

3 dwg