Research On Forming Process Of Typical Sheet Metal Parts In Aviation Engine

In order to meet the needs that high thrust-to-weight ratio and other performance of advanced aviation engine.The sheet metal structure parts is replacing the traditional castings and forgings.The parts must has excellent service performance because the aviation engine has to working for long time in hot environment.But the bad formability of the material makes the forming process difficult,it has become the bottleneck for china’s aviation engine industry. This paper explores the forming process of super alloy GH163 flame tube and LY16 aluminium alloy special-shaped drawing parts what have been apply to the engine in a factory,the corresponding research was conducted as follows.The basic formability of GH163 and LY16 was obtained by uniaxial tensile tests,according to the characteristics of material flow stress curve to chose suitable constitutive model and got the corresponding constitutive equation.To study the formability of sheet metal by the method of simulation test and provided the necessary conditions for numerical simulation.Making two forming process for the flame tube depended on enlarge hole and rolling performance of super alloy GH163 and comparing the results of numerical simulation.Explaining the reasons that cause the wrinkle and cracking at the bottom of special-shaped drawing parts and solving the problems by theoretical analysis.Finally,the parts was made successfully through the forming experiment,and inspected by quality tests.Following were the main results.The forming process of flame tube was not welding but drawing by making correct assessment for super alloy GH163.The springback of it was small and the appearance was accurate.Besides,excluding the unfavorable factors that welding quality couldn’t be guaranteed and so on.Solving the problems of cracking and wrinkle by increase the pre-forming height,the next two procedure was without blankholding and replace the rigid punch with soft medium separately for special-shaped drawing parts.the thickness of the parts was well-distributed and the quality was good. This research broke through the technical bottleneck in the production of typical sheet metal parts of aviation engine, and solved the problem that the percent of pass was low and the trial manufacture was mainly based on experience.