Abstract: The precision forging technology of barrel rifling is an advanced manufacturing process, and the machining quality of barrel bore is an important factor to ensure the initial velocity and firing accuracy of barrel weapon. The defect of precision forging rifled bore is mainly that the material in therifling lands is not full. This state of the defect is commonly referred to as non-penetration. In the actual processing, it is difficult to detect the forging state of barrel. Therefore, it is of great significance to study the forging penetration of barrel and formulate the reasonable process parameters. The precision forging of 5.8 mm rifled barrel is studied. A three-dimensional finite element model of radial forging of barrel is established by using the finite element software Abaqus. The contact status between bore and mandrel, contact normal stress, and variation of plastic strain of bore during the forging process are analyzed in detail. The criteria of forging penetration are established according to the expressive form of the unpenetrated defect. The criteria are that the change rate of the circumferential plasticity strain at each point on the rifling lands should be zero and the radial plasticity strain should be less than zero. According to the judging criteria, the forging limit diagram of barrel characterized by the forging ratio and diameter ratio of blank is obtained, and the accuracy of the limit diagram is verified through experiment. The test results show that the proposed judging criteria can be used to study the penetration of barrel. Key

Key words: riflingbarrel, precisionforging, radialforging, forgingratio, forgingpenetration