Study Of Machining Process For The Alloy Thin-walled Front Shaft

With the development of new materials metallurgy technology,as the metal of third-generation,titanium alloy has completely replaced the aluminum magnesium alloy and steel members,becoming one of the most widely applicated alloy in aero-engines,especially on the element of low pressure compressor and high-pressure compressor.In recent years,as the aviation technology develops,the thin-wall parts have been widely used in the aviation industry because of their light weight,less material and compact structure.In addition,in order to increase the thrust-weight of the aero-engine for the duration of designing,designers will design parts into thin-walled structure as much as possible on the precondition of safe use.Due to the particularity of the thin-walled parts with low rigidity,it is very easy for them to be affected by the cutting force,cutting heat and the clamping force during the process of machining,which results in the deformation.Because of the low thermal conductivity of titanium alloy,there are more parts whose temperature are raising during cutting,and as the cutting tools wear and tear,it is more difficult to guarantee the dimensions of the parts.As a result,many out-of-tolerance or waste parts has been produced,which greatly restrict the usage and delivery of the titanium alloy thin-walled rotative parts in aero-engines.Based on the research on the material and cutting characteristics of the titanium alloy and the machining status of the large titanium alloy thin-walled front shaft in aero-engines,this article mainly analyzes the machining characteristics of the titanium alloy thin-walled front shaft,aiming to improve and optimize both the process routes and methods of them.To reach the goal,the route of machining process should be firstly drew up according to the special structure,control requirement and characteristics during machining,and the lessons drew from the past of machining the large titanium alloy thin-walled front shaft.Then the proper clamping fixtures should be designed based on the structure and features of the parts,and proper material and plan of cutting tool must be chosen and made according to the structure characteristics of the parts and the difficult machining features of titanium alloy.Finally,to control the deformation of parts and guarantee the designing dimensions and technical specifications,operation steps for the finish machining should also be refined and the moving pathes and processing parameters of nc should be optimized.Besides,to improve the surface integrity of the parts,the experiments of shot peening have been conducted on the important positions of the parts,the results of which play an important role in enhancing the anti-fatigue performance of the parts.Above all,the manufacturing technologies and clamping fixtures of large titanium alloy thin-walled front shaft studied in this paper not only lead to the resolutions of the manufacturing problems for enterprises,which ensures the optimal delivery of the parts,but have high application promotion value for improving the manufacturing technologies of large titanium alloy thin-walled front shaft.