It has been performed the physical simulation of the isothermal forming process of Ti alloy frame structure with high rib and thin web and with Z, Ч and H cross-section and with different height/width ratios. In this survey it is found that the ability of filling die space is increased with the increase of deformation in all cases, whether which section of the forming part is or which shape the blank is, the metal flowing speed to convex arc and broad cavity is faster than that to concave arc and narrow cavity. The blank shape should be designed in accordance with the principle to meet the needs for metal filling and the shortest transferring paths. The use of Al alloy to simulate Ti alloy isothermal forming process can truthfully reveal Ti alloy flowing and filling ability in isothermal forming process.
By using case-based reasoning and parametrization design idea, 3D CAD technology and database management technology are used in the assembly tooling design, the assembly tooling design and management system are realized based on Pro/E platform. The structure and the function implementation method of this system are introduced.
On the basis of analysis of default diagnosis characteristics of aviation equipment, an expert system(ES) framework of default diagnosis in aviation equipment based on FNN is put forward. Some key technologies, such as the reasoning mechanism under combination of ES and FNN, generative method of FNN, the knowledge acquisition and self~learning are described. The system framework method provides a new thinking for research on default diagnosis of aviation equipment.
The relationship between the microstructure, constitution and phase of MGH956 superalloy joint TLP bonded with KNi9 interlayer and the bonding process is analyzed. The forming mechanism of defects in welds is explained and the process parameters are optimized. The research results show that the integrated TLP bonded joints are obtained when bonding temperature T is 1 240℃ and holding time t is 480min.
