| Titanium alloy is a high performance material in the field of aerospace parts manufacturing today.It plays an important role in the weight reduction of aircraft due to its high strength and light weight,however,the plasticity of titanium alloy is poor at room temperature,and it is difficult to be machined in practical applications.The superplastic forming/diffusion bonding(SPF/DB)technology breaks through the traditional process methods,forge it in low strain rate,suitable temperature environment,with the characteristics of high elongation and low deformation resistance.This paper takes the titanium alloy superplastic forming/diffusion bonding process as a starting point,combing with the control elements of key process parameters,and launches the research and development of special equipment for aviation titanium alloy wall superplastic forming system and process test.The main research contents of this paper are as follows:Using the finite element analysis method to simulate the superplastic inflatable forming process of the titanium alloy double-layer plate structure,observe the changes of the parts in the mold directly,and make direct analysis and judgments on the defects generated during the forming process.After repeated adjustments of process parameters,improve the wall thickness distribution quality of the part forming gradually,shorten the process development cycle of the parts,reduce the process development cost,and provide important process guidance for the development of equipment and the trial production of parts.Through the design of the virtual prototype,the main functional modules are reasonably integrated into the main press body,forming a compact overall layout.In order to meet the process environment required for superplastic forming of titanium alloys,develop a pre-stressed body with a rigidity of 1/10000 mm,a hybrid servo hydraulic system with a pressure control accuracy of ±0.1MPa,and a heating platform with a temperature control accuracy of ±5?,superplastic inflatable system with pressure control accuracy of ±0.02 MPa,heat preservation system with external temperature lower than 80? when the internal temperature reaches1000?,and cooling circulation system that meets the safety redundant design.Adopt bus connection control system,use S7-300 PLC as the temperature control core,solid state relays as the heating output core,S7-1200 PLC as the pressure and displacement control core,and use 22-inch touch screen to monitor the status of the equipment,data storage and operation settings,etc.At the same time,real-time monitor operating status of equipment and provision of fault warnings are provided by multi-sensor data monitoring system and remote operation and maintenance system.In the dynamic performance test of superplastic forming equipment,the performance of the equipment provides a reliable basis for the trial production of parts.Use Ti-55 titanium alloy material to carry out the superplastic forming process test of the double-layer plate,preset process curve is obtained by the finite element analysis,carry out the sheet preparation and process operation according to the specific procedure,and analyze the quality of the formed parts.Keep high consistency with the finite element analysis results.The research and development of superplastic forming equipment for aviation titanium alloy siding aims to solve the shortcomings of domestic titanium alloy superplastic forming equipment,bridge the gap with similar foreign manufacturing equipment,and ensure the safety of key equipment in the industry. |
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