Cold-pilger-rolling system for small thin-walled pipes - heats pipe and tools to working temp. before and during initial rolling operation

摘要

The calibrated rollers are moved over the temporarily stationary pipe, inside with is a calibrated mandrel aiding the shaping operation. Before and/or during the initial rolling operation, the pipe, rollers and mandrel are heated to working temp. During this operation, the rolling gap can be larger than for the main operation, it being continuously reduced to the final value. Heat can be supplied from an external source, the arrival at working temp. being monitored. The measurement signal is used to control gap adjustment and heat supply. USE/ADVANTAGE - Allows prodn. of steadily smaller and thinner-walled pipes than has hitherto been possible.