TECHNICAL AND ECONOMIC ADVANTAGES OF USING ELONGATING MANDREL MADE OF FORGED BLANK WHEN ROLLING ON A CONTINUOUS MILL WITH A CONTROLLED-MOVABLE MANDREL
A. I. TOVSTELEVA In the article, the current problem of reducing the cost of pipe?rolling products, which is especially acute in the world market of metal products high competition conditions is considered. A significant share in the cost of pipe products stands at the cost of rolling tools. Reducing the cost of buying adeforming tool allows you to make considerable savings in the seamless pipes’ production. The article presents: analysis of the economic efficiency of manufacturing long cylindrical mandrels from a semi?finished product – forged billet at OJSC «BSW – management company of «BMC» holding»; development of the technological process for the production of long mandrels depending on the required size; the results on the manufacture of long cylindrical mandrels from forged billet at OJSC «BSW – management company of «BMC» holding», as well as their industrial tests in the conditions of the pipe rolling shop. A positive result of using long mandrels of the PQF mill made of forged blanks was obtained.