Design & Research Of Pre-Stressed Jig Used In Shot Peening Forming Of The Integral Wing Panel

Shot peening forming of pre-stressed for integral panel of airplane wing is a key technique of modern aircraft, is a big aircraft manufacturing process insurmountable stage process. Compared with advanced foreign aircraft manufacturers have mature, compared to pre-stressed shot peening forming technology in our country is still in the study, the crucial stage, the technical level is relatively backward. In national large aircraft development strategy, the technology is one of the bottlenecks restrict the wing panel manufacturing, to break through. Pre-stressed jig is integral wing panel pre-stressed shot peening forming technology is an important auxiliary mechanism, is the development of large aircraft "C919 aircraft wing panel shot peening forming technology research" topic in the corpus. The purpose of this study is to to technology innovation, pre-stressed jig, change the previous manual loading ways of the pre-stressed and low production efficiency, the design which has the function of automatic adjustment function and flexible new type pre-stressed jig automation.First pre-stressed jig is required according to the user about the requirements of the two aspects of automation and flexible, combined with the pre-stressed load object (C919 aircraft integral wing panel, hereinafter referred to as the "integral wing panel") of the characteristics, process of shot peening forming technology, shot peening machine tool structure, pre-stressed loading process planning, and user requirements, overall design scheme of pre-stressed fixtures is put forward. Overall design includes loading position of the plan, selection of dynamic design, structure design, transmission mechanism scheme design, control system design, and puts forward the feasible solution.Then described in detail in the process of solving the integral wing panel pre-stressed finite element mathematical modeling, geometric model simplification and build, the division of grid, selection of unit type, connection between parts processing, the setting of boundary conditions are important finite element modeling process, and according to the actual parameters to solve the integral panel each rib stance in the wing of the pre-stress value.Then pneumatic pre-stressed structure design of fixture, including stress analysis was carried out on the institutions, work mechanism and the design of the bearing mechanism, column design, the design of the framework. Design a set of meet the requirements of flexible, stiffness and weight loss of pre-stressed jig structure.Finally pre-stressed fixture design of pneumatic control, including the design of single action control, linkage control and composite control design, and design of pneumatic products selection, pneumatic control system could satisfy the requirement of pneumatic automation design.Design basis for the purpose of this article before, developed a set of integral wing panel pneumatic pre-stressed jig, through multiple pre-stressed loading test and verify, the results show that the project meet the requirements of the comprehensive design index. Project successful application for subsequent large aircraft wings of various sizes as a integral wing panel pre-stressed jig design has important reference value.