Study On Processing Technology Of A New Inter-stage Duct Assembly

The inter-stage duct is the main force-bearing component of a large turbofan engine and responsible for connecting the aircraft with the engine.The thrust generated by the engine is transmitted to the aircraft through the inter-stage duct.In addition to bearing capacity,the inter-stage duct also plays a role in diverting the inner and outer ducted airflows.Because of its complex structure and difficult manufacturing,it is an important component affecting engine performance.Titanium alloy is currently the preferred material for aero-engine manufacturing due to its high specific strength,good heat resistance and corrosion resistance.Therefore,the development of large titanium alloy intermediate cartridge receiver with new structure is of great significance to the development and progress of our country’s aero-engines especially the development and progress of military high-thrust turbofan engines.This paper makes a comprehensive study on the scientific research and production process of the new inter-stage duct.First of all,through the use of UG modeling function to design the process route of the new research intermediate case assembly and the simulation of numerical control machining by VERICUT software,the combination of the two software can find the problem of process preparation before the on-site machining of the product and avoid the loss caused by insufficient cognition.Secondly,for the optimization of cutting parameters of titanium alloy,this paper designs orthogonal cutting experiments and studies the influence of cutting speed,feed per tooth,axial cutting depth and radial cutting depth on cutting force and tool life in the cutting process.Based on the test data,the empirical formula of cutting force and tool life is established and the change law of the empirical formula is summarized.It is found that smaller cutting speed and feed per tooth can effectively reduce cutting force and improve tool life,but it will increase cutting time and reduce cutting efficiency.For this reason,this paper also combines the actual production of the factory,aims at improving the processing efficiency and economic benefits and on the premise of ensuring the processing quality of parts,selects the optimized cutting parameters in combination with empirical formulas to make certain contributions to the cost reduction and efficiency increase of the factory.The whole set of solutions for the development of the cartridge receiver given in this paper also has certain guiding significance for the development and production of the following cartridge receiver.