Development and investigation of a two-line tube rolling on the KhPT-55 cold tube rolling mill

A change for the two-thread rolling accomplished at the Pervoural'skij new-tube work in 1969 is an effective way of increasing the productivity of the functioning mills of cold tube rolling. A brief description and technological characteristics of the modified KHPT-55 rolling-mill are given. The mill started to roll two steel tubes simultaneously for the first time. The results of an experimental study of the two-thread and one-thread rolling-mills including the determination of the power-strength parameters are presented. The structural shortcomings of the initial model eliminated in the process of operation are described. Despite the decrease in the feed and the number of double passes per minute and some increase in idling, the rolling-mill productivity increased 1.5 times