Based on different theories and techniques for the reduction of stress concentration, and on the basis of forms of breech ring fillets in general use, over a dozen of fillet forms are proposed.

Application study for multiple length forging breech ring blank;

Base on operational properties of RAVEN vent mechanism,two kinds of different breechblock opening mode were discussed,physical and classical interior ballistics models of inertial breech RAVEN were emphatically set up,and the numerical simulation was implemented.