Optimal Design Of Precision Forging Process Of Blade Based On Numerical Simulation

A blade is one of the most important mechanical components in aviation engine. Precision forging is a tendency of development of blade forging technology. Blade precision forging is a complex process with multi-factor effects. The preform design and the technology parameters selection are very important for the forging manufacturing cost, quality and efficiency. So the optimal design of preform shape and technology parameters for blade precision forging is the basic research work for the realization of blade precision forging. Based on optimization theory, the key technical problems of optimal design for blade precision forging are studied by the FEM numerical simulation. Taking blade with a tenon as study object, the optimal design of preform shape and technology parameters is done. The appropriate preform shape and technology parameters of blade with a tenon precision forging are determined.A brief introduction to the project and its main results are as follows:The key technical problems of optimal design for blade precision forging are studied based on FEM numerical simulation. The method to set up blade precision forging shape optimal objective function is proposed. The parameterizing curve expression of preform shape and optimal design variables' abstraction in blade precision forging process are studied.The optimal arithmetic is selected.By the dummy experiment design, the multivariant nonlinear regression model between the blade final forging shape optimal objective function and the coordinate of the control points of the B-spline to describe the preform shape is built. Based on the above model and direct-vision analysis of dummy orthogonal design result, the preform shape of blade precesion forging is optimized by the optimal method of the sensitivity analysis. By the method of dummy experiment-regression prediction-sensitivity optimization, the rational preform shape of the blade precesion forging is determined, by which the final forging overflowing the mould precisely can be obtained.The optimal objective is to obtain such blade final forging that overflow the mould precisely, and the optimal design variables are the technology parameters of friction gene between the mould and the workpiece and mould velocity. By the improved golden section method, the blade precision forging is optimized. The optimal technology parameters (friction gene select 0.12, mould press velocityselect 25mm/s) are obtained.