Radial Friction Welding Process Study On Shells

The need of shell bodies improvements and shells assembly process become higher and higher with the development of modern war and the extensive application of thin-walled shells. Shells assembly process has been technical bottleneck that puzzled the shell design and manufacture Over the years, The special friction welding machine made by the Institute of China Ordnance Industry fifth nine which can complete the radial and axial inertia, continuous drive and other craft and small batch production as the first friction welding has achieved the connection of the thin wall copper shells and the steel projectile, updated and transferred the traditional shells assembly and processing. The technology known as shells with radial friction welding technology which is the focus bomb belt assembly technology of international research is a good way to solve the connection of shell bodies and the shells.Shells with radial friction welding technology are one of friction welding technique that achieved the connection of radial side through the radial pressure. The clamping state of work-piece is very important in the welding process through practice and experimental results. The clamping state instability that caused by the too large friction torque between copper and shells during the welding often emerge the slipping phenomenon that is very detrimental to the shell welding. The Institute of China Ordnance Industry fifty-nine has solved the problem from practice naturally through improving the traditional friction welding clamp model.The task spring from the projects of Institute of China Ordnance Industry fifty nine, According to project requirements for small caliber artillery shells with friction welding,the stability of traditional and improving grip models will be numerical studied in order to provide theoretical support for rationality of the improving model. at the same time,the conclusion of simulation analysis can be used guiding the practical production processFirst of all, creat the simplified model of friction welding clamp model using Pro-E 3D modeling software according to the structure and process characteristics of radial friction welding clamp model based on the research and analysis of the shell radial friction structure.Secondly, confirm the three-dimensional contacting analysis numerical simulation programs based on the finite element method, the radial friction welding characteristics of small-caliber shells and theory guidance in experimental design. Meanwhile, up-build the suitable calculation model based on the finite element software ANSYS and 36 times developed simulation program, the establishment of a suitable calculation model, and numerical simulate the stress and strain, the relative displacement of the two gripping models grip in the welding process.Finally, compare and analyze the gotten distribution of stress and strain, And meanwhile, elicit the curve and relationship function between the clamping force and the maximum allowable friction torque in the welding of two kinds of griping model with the disposal of the numerical simulation results using professional graphics software Origin. The results show that: the improved model is superior to the traditional clamp clamping model from the clamping stress and strain state, the anti-twisting of clamping model. In the improved model of the gripping clamp, the maximum allowable friction torque and axial clamp force and radial clamp force met: M max = a* P1+b*P2 For a range from 51.5 ~ 54.2, and b range from 121 to 124.The research project received acknowledgement from the Institute of China Ordnance Industry 59,and over-passed the acceptance management recognition and has been used in production.