According to the request of application and maintenance of retarders in marshalling station, this article supplies the arithmetic and thought of program design of automatism calculate the rolling times of retarders, and it also give out the calculate expressions and program flow chart.

The new-style unitary roller tube is machined by means of reduction spinning, during the thin-wall tube reduction spinning, the selection of spinning path and count is important for spinning figuration.

Wall thickness variation during multi-pass spinning of large complicated shell;

Because of the limitation of material forming limit and other factors, it is necessary to produce this kind of parts by multi-pass spinning technology.