The cut principle and feature of the rolling cut trimming shear were set forth, and the application of rolling cut placed on cutting line for the heavy plate mill at home were analyzed.

The following conclusions can be drawn. 1. The main influence systems of causing this heavy rainfall are southwest vortex, shear line and southwest low-level jet.

The heavy rainfall is dominated by a mesoscale warm shear line, having a closed relationship with a mesoscale system composed by mesoscale shear line, thunderstorm high and mesoscale vortex;