Forming Technological Design And Process Simulation Of Large-sized Drop-forging Of Ti-6Al-4V Alloy

Recently, with the development of aerial parts towards thin-walled, complex and large-scale, it is necessary to improve the forming property of stagnant materials, such as titanium alloy, high-temperature alloy and so on. As a result of giant resistance of deformation, narrow forging temperature interval and other characters, based on existing facilities, how to adequately make use of plastic working simulation technique to accomplish the product design and quality controlling rapidly and accurately has become an increasingly hot topic.Therefore, in this dissertation, frame superstructure of X-plane has been investigated. According to the forming characteristics of Ti-6A1-4V alloy, the method of dynamic material model analysis and numerical simulation has been used to analyze the hot-working character of Ti-6A1-4V alloy, stamp forging technology, characteristics of large-scale frame and the distribution rules of recrystallized structure after forging. A brief introduction to the work and main achievements are as follows:1. Base on hot processing map, the hot-working character of Ti-6A1-4V alloy during high temperature forming process has been investigated and the range of hot working process parameters corresponding with stable region and unstable zone has been determined. They provide necessary technical support for the optimization of process parameters and the implement of structure controlling after forging.2. According to the requirement of parts drawing and relative technical requirement, forging and die have been designed, at the same time forming technological design has been determined. Based on character of forging, different billet shape has been already designed.3. Based on MSC. Superforge software, the stamp forging process of large-sized drop-forging has been simulated and analyzed with Multi-stage Finite Volume Method. Therefore, a reliable technical insurance was provided for of proper distribution of technological resource and the optimized design of billet.4. The dynamic recrystal grain size of key point has been figured out using...