Development Of Typical Sheet Metal Formability Database And Material Selection Evaluation System For Aero-engine

Aero-engine sheet metal parts are subjected to harsh working conditions in the temperature, load and surrounding medium, which are like aero-engine components. Aluminum alloy, titanium alloy and high temperature alloy sheet are suitable materials for manufacture. With the increasing requirements of advanced aero-engine manufacturing, digital precision forming has become the inevitable development trend of aero-engine sheet metal forming. At present, domestic aero-engine manufacture of sheet metal forming lacks basic data of the typical sheet metal formability, and it directly affects the implementation of digital precision sheet metal forming. Therefore, studying on aero-engine material formability and constructing material selection evaluation system to meet China's aero-engine sheet metal precision parts manufacturing in basic data requirements of forming process and reasonable material selection has an important significance.This paper studies on the development of typical sheet metal formability database and material selection evaluation system of aero-engine.In the analysis of aero-engine with the material properties of typical plate types, this paper expounds the sheet formability index, characterization and testing methods, which base on the requirement of international general mode and sheet metal forming process. Uniaxial tensile test, formability test and the formability of FLD test of GH605 high temperature alloy and Ti-230 titanium alloy for typical aeroengine materials had been researched.The constitutive equation, yield strength, tensile strength, elongation, plastic strain ratio and other basic forming performance parameters were obtained. The indicator of simulating formability test, such as limit drawing ratio, expanding rate, cup drawing value and minimum relative bending radius were obtained.The forming limit diagram was obtained by the FLD test, which provided the basis for the fracture instability criterion of the sheet metal. In addition, the forming performance data including aluminum alloy, titanium alloy and high-temperature alloy were from the test accumulation by the subject group. These data provided the basic data support for finite element analysis, sheet metal formability database and material selection evaluation system.Based on the precision forming process of aircraft engine sheet metal and the reasonable requirements of material selection, the database system of forming performance and the database content were designed.The information was reasonable classified. The material database was analysed systematically and then the rules of material selection was determined. The system was designed by Visual Studio2012, using C# as the language and SQL Server 2008 as the database platform. The front interface of system could query and search the information and select typical aero-engine parts expediently. System background management achieved an orderly database update and management by setting the administrator and user rights, so that the system could be better applied in the actual production.Through the above research work, this paper has achieved the following results:(1) Based on the test results of formability, the system was developed. It had 29 kinds of different thickness specifications of typical mateials, including aluminum alloy, titanium alloy, high temperature alloy and stainless steel. The database was shared with the commercial finite element analysis software of Dynaform.(2) The system could provide the data support and criterion of forming performance for the process design and the forming process of the finite element simulation analysis.(3) The system has been successfully applied to precision forming production of a certain type of aero-engine sheet metal parts.