Boyarkin V. Development of scientific bases and technology of cold profiling of rectangular pipes of the increased accuracy by rolling in four-roll calibres

The dissertation is devoted to definition of dependences of metal forming parameters at shaping in four-roll calibres of pipes from low-carbonaceous steels and aluminium alloys. Influence of parameters of shaping on the following elements metal forming has been determined: a deflection of the party, a thickening of a wall, formation of interface in corners of pipes. The theoretical analysis of elastic - plastic deformation of metal has been carried out by means of the two-dimensional finite-element mathematical model. In the work the experimental research of metal forming in four-roll calibre has been carried out at shaping of pipes from low-carbonaceous steels and aluminium alloys. Improvement of the technology and methods of calculation of parameters of shaping have been offered and is proved. It provides increase of accuracy of shaped pipes and resources saving. Key words: shaping, forming, rectangular pipes, cold rolling, four-roll calibre, pass, radius of formation, a deflection of the party, wallthickness.