Abstract: The engraving process of sniper rifle bullet has a great influence on the firing accuracy of sni-per rifle, which is closely related to the bullet ramp. In order to reveal the effect of bullet ramp on engraving process, a test device is designed for the quasi-static engraving experiments under two different conditions of bullet ramp, and the influence of forcing cone angle on engraving force is obtained. A finite element model is established to simulate the engraving process based on the theory of nonlinear finite element. The simulation results reveal the relationship of forcing cone angle and engraving force, the composition of engraving force, the proportion of each part and the formation mechanism of engraving force, and show that the engraving characteristics of sniper rifle bullet are different from those of other bullets. Furthermore, the engraving process is divided into five parts according to the structures of bullet and bullet ramp, and the formula of each part is derived. The quasi-static engraving process of sniper rifle bullet is studied in three aspects: experiment, simulation and theory, which is helpful in understanding the engraving process of sniper rifle bullet, and the matching mechanism of bullet and bullet ramp.

Key words: ordnance science and technology, bullet engraving, forcing cone angle, engraving experiment, finite element, interaction of bullet and sniper rifle